JPH0379925B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power supply system for a linear motor,
In particular, it relates to improvements in reactive power control.

In superconducting magnetic levitation type ultra-high-speed railways, the armature coil of the linear motor (usually called the propulsion coil) is installed on the track side for reasons such as reducing vehicle weight.
The vehicle is driven by energizing the propulsion coil from the power conversion device via the switch.

Here, the propulsion coil on the track side is divided into sections of appropriate length in order to improve the power factor of the linear motor and reduce the capacity of the power converter, and the propulsion coil in each section is connected via a switch. Connected to power converter.

The structure is such that power is supplied only to the propulsion coils in the section where the vehicle is present via the switch.

Then, a reactive power compensator is provided at each substation where the power converter is installed. Therefore, in a vast ultra-high-speed railway, the number of substations increases, and the number of reactive power compensators also increases. Therefore, from the perspective of equipment costs, each compensation device should have the minimum necessary capacity. However, in this case, there is a strong possibility that compensation for reactive power will be insufficient for some reason. Furthermore, when the reactive power compensator malfunctions, there is a possibility of not only insufficient compensation but also overcompensation.

An object of the present invention is to provide a power supply system for a linear motor that can reduce the chance of undercompensation or overcompensation of reactive power.

The present invention provides a reactive power compensator corresponding to a large number of substations, and normally, the corresponding reactive power compensator improves the power factor of the substation where a vehicle is present, and when an abnormality occurs in the power factor. At times, the system is characterized in that it is assisted by a reactive power compensator corresponding to a substation that is not supplying power to the vehicle.

Figure 1 is a single line diagram of an embodiment of the present invention applied to a linear motor power supply system in the case of three substations per power system, in which the propulsion coils of the linear motor are connected to the propulsion coils LM ₁ to LM _oo in each section. The feeders F 11 to F 32 are connected to the feeders F ₁₁ to _{F 32} in an alternately repeated manner using the feeder section switches SW ₁ to _{SW oo} , respectively, and the feeders F ₁₁ and F ₁₂ are connected to the A group power converters CC ₁₁ ,
CC ₁₂ is connected to feeders F ₂₁ and F ₂₂ , and power conversion devices CC ₂₁ and CC ₂₂ of group B are connected to feeders F ₃₁ and F ₃₂ , respectively, and power conversion devices CC ₃₁ and CC _{32 of group C are connected to feeders F 31 and F 32} , respectively. .

In addition, sections S ₁ and S 2 and substation switchgears SP _{1 and} SP ₂ are installed near the middle between A substation and B substation and between B substation and C substation, respectively.
It is configured to operate one of the substations A to C depending on the position of the vehicle T.

In addition, the power transformer T _r11 is connected to the AC input power supply SS ₂ ,
Power converters CC 11 and CC ₁₂ are connected to power converters CC ₁₁ and CC ₁₂ via T r12, and power converters CC 21 and CC ₁₂ are connected to each other via power transformers T _r21 and T _r22 , respectively.
CC ₂₂ is connected to the power converters CC ₃₁ and CC ₃₂ via the power transformer T _r31 and T _r32 , and the reactive power compensator RPC ₁ is connected via the power transformer T _r10 to the reactive power compensator RPC 1 via the power transformer T _r20 . Reactive power compensator RPC ₂ , power transformer
Reactive power compensators RPC ₃ are respectively connected via T _r30 .

Figure 2 shows the circuits used as reactive power compensators RPC ₁ to _{RPC 3} , where C ₁ to C ₇ are capacitors, and L ₁
~ _L7 is a series reactor for each of capacitors _C1 to _C7 , _T1 to _T7 are thyristor switches that turn on or off capacitors _C1 to _C7 , L is a reactor, and T _h controls reactor L. Consists of a phase control thyristor.

Next, the operation of the substation switchgear in the single line diagram of FIG. 1 will be explained using the control circuit block diagram shown in FIG. 3.

First, until the vehicle T reaches the position before the feeder section switch SW _ok-2 is closed, the feeder section switch SW ₁ ,
The feeder section switching device SC ₁ , which instructs the switching control of SW ₂ , ..., SW _ok-3 and the start/stop of the power converters CC ₁₁ , CC ₁₂ of group A, is operated by the signal from the position detector PD ₁ . , with this output power converter CC ₁₁ , CC ₁₂
operate alternately.

Then, by operating the reactive power compensator RPC ₁ using the gate control device TS ₁ which inputs the output of the feeding section switching device SC ₁ and the respective outputs of the control circuit Y ₁ , the vehicle T is divided into two propulsion coils. It also compensates for the reactive power of the AC input power source SS ₂ when traveling or when powering the propulsion coil, regardless of whether the vehicle T is on a particular propulsion coil.

Next, let us describe the case where the vehicle T reaches the position where the feeder section switch SW _ok-2 is closed. In this case, when the feeder section switch SW _ok-2 is closed, the memory circuit ME ₁ is activated. Since the output is output, the substation switchgear SP ₁ is closed, and both the primary delay circuit PDC ₁ and the memory circuit ME ₂ output output.

When the memory circuit ME ₂ outputs an output, the feeder section switching device SC ₂ and the gate control device TS ₂ , which had been waiting in a state matching the speed of the vehicle T with the signal from the position detector PD ₂ , both output. Therefore, group B power converters CC ₂₁ , CC ₂₂ and reactive power compensator
RPC ₂ works. Since the feeding section switching devices SC ₁ and SC ₂ and the gate control devices TS ₁ and TS ₂ each output in the same state, the power conversion device
CC ₁₁ and CC ₁₂ and power converters CC ₂₁ and CC ₂₂ have the same output frequency. In this state, A substation and B substation
Section S ₁ installed in the middle of the substation is connected to vehicle T.
When passing through, the feeders F ₁₁ and F _{12 are connected to the feeders F 11 and F 12} via the power exchange devices CC ₁₁ and CC ₁₂ , and also to the feeders F ₂₁ and F 12 .
Since power is supplied to F ₂₂ via the power exchange devices CC ₂₁ and CC ₂₂ , no thrust pulsation occurs in the vehicle T, so the vehicle T can be operated stably.

In addition, since the feeding section switching devices SC ₁ and SC ₂ and the control circuits Y ₁ and Y ₂ each output the same output, the reactive power compensator RPC is used to prevent reactive power fluctuations on the AC input power source SS ₂ side. ₁ and RPC ₂ operate together, so AC input power supply due to load fluctuations
Fluctuations in reactive power on the SS ₂ side can be compensated for.

When the vehicle T reaches the position where the feeder section switch SW _ok+1 is closed, the memory circuit ME ₃ outputs an output, so that the operations of the power converters CC ₁₁ , CC ₁₂ and the reactive power compensator RPC ₁ are controlled respectively. stop it,
Then, the memory circuit ME ₁ is reset to open the substation switchgear SP ₁ and the primary lag circuit PDC ₁ is opened.
The output of TS 2 also becomes zero, but since the memory circuit ME ₂ continues to output, only substation B operates from this point on, and is disabled based on the respective outputs of gate control device TS ₂ and control circuit Y ₂ . power compensator
By operating RPC ₂ , it is possible to compensate for reactive power fluctuations on the AC input power supply SS ₂ side due to load fluctuations.

Then, when the next substation switchgear SP ₂ is closed, the above-mentioned operation is repeated, and after the substation switchgear SP ₂ is closed, the memory circuit ME ₆ outputs an output, and the power converter CC is ₂₁ , CC ₂₂ , and the reactive power compensator RPC ₂ are stopped, and the memory circuit ME ₂ is reset, and from this point on, only substation C operates.

Here, E is the power converter CC ₁₁ , CC ₁₂ and the reactive power compensator from the substation before the A substation.
This is a command for operating RPC ₁ , and F is a command for operating the power converter and reactive power compensator of the substation after substation C.

Through the above-described operations, the substation is opened and closed in an orderly manner, and the vehicle T is operated stably, while reactive power fluctuations on the AC input power source SS ₂ side can be compensated for.

Next, the operation when a thyristor control type as shown in Fig. 2 is used as the reactive power compensator RPC in the single line diagram of Fig. 1 will be explained using the control circuit block diagram shown in Fig. 4. do.

First, to explain the symbols in the block diagram of FIG. 4 using the waveform diagram shown in FIG. 5, VD ₁ is a voltage waveform shaping circuit that shapes the output of voltage detector PT ₁ to create a rectangular wave; ID ₁ is a current waveform shaping circuit that shapes the output of current detector CT ₁ to create a rectangular wave, and Y ₁ is a control circuit for reactive power compensator RPC ₁ , which connects NOT circuits NOT ₁ to NOT ₃ and AC input. power supply
Mono-multi circuits MM ₁ to _{MM 3} and exclusive AND circuits for setting the power factor cosθ of SS ₂ to a certain value
EOR ₁ and EOR ₂ , step circuits TC ₁ and TC ₂ that equally divide a certain range of power factor cos θ into four, and a comparison circuit CP that compares the outputs of these TC ₁ and TC ₂ with the output of current waveform shaping circuit ID ₁ . ₁ , CP ₂ , AND circuit AND ₁ , AND ₂ ,
A frequency doubler circuit FD ₁ that converts the output of the NOT circuit NOT ₁ to 1/3 times the frequency, and a counter circuit CD ₁ that outputs an output when the number of times that the outputs of this FD ₁ and the AND circuit AND ₂ overlap is 2 times. It consists of a differentiating circuit ED ₁ that differentiates the output of this CD ₁ and generates a narrow pulse. On the other hand, PC ₁ is a fault detection device that detects a fault in the reactive power compensator RPC ₁ , which consists of a mono-multi circuit MM ₄ for setting the power factor cosθ to a certain value, NOT circuits NOT ₄ and NOT ₅ , and a logical product. Circuit AND ₃ ~
AND ₆ , exclusive OR circuit EOR ₃ , frequency doubler circuit FD ₁ , and AND circuits AND ₃ and AND _5. Counter circuits CD ₂ and CD that output when the number of times each output wraps is three times. ₃ and a differentiator circuit that differentiates the outputs of CD ₂ and CD ₃ to generate narrow pulses.
ED ₂ , ED ₃ , a differentiation circuit ED ₄ that differentiates the output of the current waveform shaping circuit ID ₁ and generates a narrow pulse, and a memory that stores the outputs of AND ₄ and AND ₆ . Circuit ME ₁₁ , ME ₁₂ and this ME ₁₁ ,
It is composed of display circuits HD ₁ and HD ₂ that display a failure state when ME ₁₂ outputs an output, and signal circuits SD ₁ and SD ₂ that generate signals.

Also, a gate distributor GD ₁ that determines how many of the thyristor switches T ₂ to _{T 5} to open and close the capacitors C ₂ to _{C 5} in the circuit of FIG. 2 are turned on and off;
a gate distributor GD ₂ that turns on and off thyristor switches T ₆ and T ₇ with the output of the feeding section switching device SC ₁ ;
A control circuit that operates the circuit shown in FIG. 2 is constituted by a circuit that controls the thyristor T _h by applying the output of the OR circuit OR ₃ to the phase shifter APS.

Next, the operation of the reactive power compensator RPC ₁ by the control circuit Y ₁ of FIG. 4 will be explained using the waveform diagram of FIG. 5. First, in FIG. 5, the period from time t ₁ to _{t 3} is one cycle of the voltage waveform of the AC input power source SS ₂ , and the control circuit Y ₁ is a positive half-wave circuit as the voltage waveform shaping circuit VD ₁ . But the counter circuit CD ₁
As an input to CD ₃ , an output from a negative half wave (not shown) is also provided via a mono multi-circuit, an exclusive OR circuit, etc. Capacitor in the circuit shown in Figure 2
The circuit that turns on the thyristor switches T ₂ to T ₅ that open and close C ₂ to _{C 5} calculates the power factor cos θ on the AC input power supply SS ₂ side based on the fall of the output of the NOT circuit NOT ₁ .
Mono multi circuit MM ₁ and power factor cosθ set to 0.90
is set to 0.95.The output of the exclusive OR circuit EOR ₁ whose input is the output of the mono multi-circuit MM ₂ is TC ₁₁
It consists of a chopping circuit TC ₁ that subdivides as shown in ~TC ₁₄ , and a comparison circuit CP ₁ that outputs an output when this output and the output of the current waveform shaping circuit ID ₁ overlap. On the other hand, the circuit that turns off the thyristor switches T ₂ to _{T 5} is a chopping circuit TC ₂ that subdivides the output of the NOT circuit NOT ₂ into TC ₂₁ to TC ₂₄ , and a loop between this output and the output of the current waveform shaping circuit ID ₁ . It consists of a comparator circuit _CP2 that outputs an output when

The outputs of the comparison circuits CP ₁ and CP ₂ are applied to the gate distribution circuit GD ₁ via the OR circuits OR ₁ and OR ₂ .

For example, in the single-line diagram of Fig. 1, when vehicle T is located on propulsion coil LM ₂ , in this case, the power converters CC ₁₁ and CC ₁₂ of substation A are operating, so the feeder classification is Gate signals G ₁ and G ₂ from switching device SC ₁ are applied to gate distribution circuit GD ₂ to turn on thyristor switches T ₆ and T ₇ to close capacitors C ₆ and C ₇ . Here, the thyristor switch _T6 is turned on and off by the gate signal _G1 , and the thyristor switch _T7 is turned on and off by the gate signal _G2 .

Even if the power converters CC ₁₁ and CC ₁₂ are operated at the same time, capacitors C ₆ and C ₇ are both closed, so it is possible to compensate for reactive power fluctuations on the AC input power supply SS _{2 side, and also to compensate for fluctuations in reactive power on the AC input power supply SS 2} side, and also to adjust the speed according to the speed of the vehicle T at that time. circuit
Some of the thyristor switches _T2 to _{T5 are turned on depending on the extent to which the outputs of TC1 to TC14 and} the output of _the current waveform shaping circuit _ID1 overlap, so the power factor cosθ can be set to 0.90 _or more. can be improved.

In other words, if the outputs TC ₁₁ to TC ₁₄ of the step circuit TC ₁ , which divides the range of power factor cos θ = 0.90 to 0.95 into four, and the output of the current waveform shaping circuit ID ₁ overlap, the comparison circuit
Thyristor switches T ₂ to _{T 5} are turned on sequentially through CP ₁ and gate distribution circuit GD ₁ to turn on capacitor C _2
〜C5 are sequentially closed. Therefore, the power converter
Even if CC ₁₁ and CC ₁₂ are operated at the same time, capacitor C ₂
Since some of ~ _C5 are closed, the power factor cosθ on the AC input power supply _SS2 side can be improved to 0.90 or more.

Then, the vehicle T is accelerated and the power converter
CC ₁₁ gate signal G ₁ turns off and power converter
When only CC ₁₂ is operated, the thyristor switch T ₆ is turned off by turning off the gate signal G ₁ and the capacitor C ₆ is opened, so that stable operation is performed without overcompensation.

Now, let us describe the case where the power factor cos θ becomes 0.96 due to the acceleration of the vehicle T even if the capacitor C ₆ is opened. In this case, the output TC ₂₄ of the chopping circuit TC ₂ and the output of the current waveform shaping circuit ID ₁ are Comparison circuit because it wraps
Through CP ₂ and gate distribution circuit GD ₁ , thyristor switch T ₅ is turned off and capacitor C ₅ is opened;
Reduce the power factor cosθ to about 0.95. Then, when the vehicle T is accelerated and the power factor cos θ is improved, the capacitors C ₂ to C ₄ are sequentially opened and controlled so that the power factor cos θ does not advance. But capacitor C ₂ ~
Even if all _C5 are opened, the vehicle T may be accelerated and the power factor cos θ may become 0.98 or more, and this case will be described.

First, the circuit that controls the phase of the thyristor T _h is a NOT circuit NOT 3 that inverts the output of the monomulti circuit MM ₃ that sets the power factor cos θ to 0.98, and a NOT circuit NOT ₂ that inverts the output of the monomulti circuit MM ₃ .
Exclusive OR circuit whose inputs are the respective outputs of
EOR ₂ and an AND circuit that outputs an output when this output and the output of the current waveform shaping circuit ID ₁ overlap.
It consists of AND ₂ , counter circuit CD ₁ , and differentiation circuit ED ₁ .

Now, the output of the logical product circuit AND ₂ and the frequency doubler circuit
When the number of times the output of FD ₁ wraps is counted twice in one cycle of the voltage waveform, the counter circuit CD ₁ outputs an output, which is differentiated by the output of the differentiator circuit ED ₁ which generates a narrow pulse. Current waveform shaping circuit ID ₁
When the output of is lapped, the phase shifter APS is operated to control the phase of the thyristor T _h so that the power factor cos θ does not lead. And the power factor cosθ is
When it becomes 0.95 or less, the output of the exclusive OR circuit EOR ₂ disappears, so the thyristor T _h is turned off.

In other words, depending on the position of the vehicle T, the AC input power source
Capacitors C ₂ to C ₇ are opened and closed so that the power factor cos θ on the SS ₂ side is controlled within the range of 0.90 to 1.0, and the phase of the reactor L is controlled by the thyristor T _h , so the reactive power on the AC input power supply SS ₂ side Fluctuations can be compensated for.

Here, the signals H ₁ , H ₂ , I ₁ , I ₂ and J ₁ are given commands from the signal distributor Y in the single line diagram of FIG. 1, which will be described next.

The above has explained the operation of the configuration diagram in FIG. 4 when the reactive power compensator RPC ₁ is normal.Next, we will explain the operation of FIG. 4 when the reactive power compensator RPC ₁ is in an abnormal state, for example. This will be explained using the configuration diagram shown in FIG.

Figure 4 shows the control circuit Y ₁ of the single line diagram in Figure 1,
Detailed circuit configurations of failure detection device PC ₁ and voltage/current detection circuit PH ₁ , and gate control device TS ₁
This shows the block diagram of the other control circuits.
Y ₂ and Y ₃ also have the same circuit configuration as in FIG. 4.

FIG. 6 shows a detailed circuit configuration of the voltage/current detection circuit PH and signal distributor Y in the single line diagram of FIG.

First, the control circuit Y ₁ to _{Y 3} of the single line diagram in Figure 1
To explain the signal system using the configuration diagram in Figure 4, the signal
_K1 is such that no command is given when the vehicle T is present in the related power supply section, and a command is given when the vehicle T is present in another unrelated power supply section.

In addition, the voltage and current detection circuit of the single line diagram in Figure 1
As shown in FIG. 6, the PH and signal divider Y are divided into three parts, PH ₁₁ to _{PH 13} and Y ₁₁ to _{Y 13} , respectively. The base signals K ₁₁ to _{K 13} of the transistors 11 to 32 are respectively the first
A command is given when the failure detection devices PC ₁ to _{PC 3} in the single-line diagram shown in the figure do not output an output, and no command is given when the failure detection devices PC ₁ to _{PC 3} output an output.

By the way, it is said that the distance between substations is usually around 20 km in consideration of power loss, etc., and in magnetic levitation ultra-high-speed railways, if the train spacing is such that there is a train at each substation, problems will arise with braking in an emergency. Therefore, it is desirable to install one substation at a time.

Therefore, the gate control device of the single line diagram in Figure 1
The case where the input signals H ₁ , H ₂ , I ₁ , and I ₂ of TS ₁ to TS ₃ are set at every substation will be explained.

AND circuit AND ₇ of gate control device TS ₁ ,
One input signal H ₁ and I ₁ of each AND ₈ is given the output signal H 1 and I ₁ of the signal distributor Y ₁₂ in FIG. 6, and the other input signal H ₂ and I 2 is given to the output signal H ₁ and I ₁ of the The output of the memory circuit ME ₂ of the block diagram of FIG. 3 which operates the power converters CC ₂₁ and CC ₂₂ is given.

AND circuit AND ₇ of gate control device TS ₂ ,
One of the input signals H ₁ and I ₁ of AND ₈ is given the output signals H ₁ and I ₁ of the signal distributors Y ₁₁ and Y ₁₃ in FIG. 6, and the other input signal H ₂ and
_I2 is supplied with the signal E in the block diagram of Fig. 3 that operates the power converters CC ₁₁ , CC ₁₂ , CC ₃₁ , and CC ₃₂ of the A substation and C substation, respectively, and the output of the memory circuit ME ₅ . .

In other words, since the train interval is set to every substation, if there is a train in the power supply section of substation A, C
There is also a train in the power supply section of the substation, so if a part of the reactive power compensators RPC ₁ and RPC ₃ connected to substation A and substation C break down, there will be no train. Power system by operating reactive power compensator RPC ₂ of substation B
This suppresses reactive power fluctuations on the SS ₁ side.

In addition, if a part of the reactive power compensator RPC ₁ or RPC ₃ fails, the reactive power compensator RPC ₂ is operated according to the command from the failed side and the power system is restored.
Reactive power fluctuations on the SS ₁ side can be suppressed.

In addition, if there is a train in the power supply section of substation B, there is no train in the power supply section of substation A or substation C, so the reactive power compensator RPC ₂ connected to substation B is In the event of a failure, reactive power fluctuations on the power system SS ₁ side can be suppressed by operating either the reactive power compensator RPC ₁ or RPC ₃ . Therefore, the output signals H ₁ and I ₁ of the signal distributor Y ₁₂ may be applied to any of the input signals H ₁ and I ₁ of the gate control devices TS ₁ and TS ₃ , respectively.

On the other hand, the input signal J ₁ of each OR circuit OR ₃ of the gate control devices TS ₁ to TS ₃ is also the input signal H ₁ and I ₁ of each of the AND circuits AND ₇ and AND ₈ described above.
The output signals J ₁ of each of the signal dividers Y ₁₁ to Y ₁₃ are given in the same order.

Now, to explain the configuration diagram in Figure 6, the inputs of the voltage and current detection circuits PH ₁₁ to _{PH 13} are connected in parallel to the outputs of the voltage detector PT and current detector CT in the single line diagram in Figure 1. Given.

In the configuration diagram of FIG. 6, when the reactive power compensator connected to the power supply section where a train is present fails, the thyristor switch T ₂ of the reactive power compensator connected to the power supply section where no train is present.
The circuit that generates the signal _H1 that turns on _T5 is connected to the power grid based on the falling edge of the output of the NOT circuit _NOT6 .
Exclusive OR circuit whose inputs are the outputs of mono multi-circuit MM ₅ that sets the power factor cos θ to 0.85 on the SS ₁ side and mono multi-circuit MM ₆ that sets the power factor cos θ to 0.95.
It consists of a chopping circuit TC ₃ that divides the output of the EOR ₇ into four, and a comparison circuit CP ₃ that outputs an output when this output and the output of the current waveform shaping circuit ID ₁₁ overlap.

On the other hand, the circuit that generates the signal _I1 that turns off the thyristor switches _T2 to _T5 is a step circuit _TC4 that divides the output of the NOT circuit _NOT7 into four, and when this output and the output of the current waveform shaping circuit _ID11 overlap. It consists of a comparator circuit _CP4 that outputs an output.

Furthermore, the circuit that generates the signal J ₁ that controls the phase of the thyristor T _h is a negative circuit NOT ₈ that inverts the output of the monomulti circuit MM ₇ that sets the power factor cos θ to 0.98.
and an exclusive OR circuit EOR ₈ which receives the respective outputs of the NOT circuit NOT ₇ as inputs, an AND circuit _{AND 7} which outputs an output when this output and the output of the current waveform shaping circuit ID ₁₁ overlap, and a NOT circuit. A frequency doubler circuit ED ₁₁ that converts the output of NOT ₆ to 1/3 frequency, a counter circuit CD ₄ that outputs an output when the number of laps between this output and the output of AND circuit AND ₇ is 2 times, and this Differentiator circuit that differentiates the output and generates narrow pulses
Consists of ED ₅ .

The configuration diagram in FIG. 6 is a circuit that does not operate unless the failure detection devices PC ₁ to _{PC 3} of the single line diagram in FIG. 1 output an output, so the reactive power compensators RPC ₁ to RPC ₃
This is a circuit that does not operate if each is normal.

Figure 7 is a gate circuit block diagram of each thyristor switch _T1 of the reactive power compensators RPC ₁ to RPC ₃ , and the failure detection device of the single line diagram of Figure 1.
An OR circuit OR which receives the respective outputs of PC ₁ to _{PC 3} as inputs, this output, the signal E in the block diagram of FIG. 3, the respective outputs of the memory circuits ME ₂ and ME ₅ , and the memory circuits ME ₃ and ME AND circuit AND 10 to AND ₃₀ whose inputs are the respective outputs of NOT ₁₀ to _{NOT 30} , which invert the respective outputs of ₆ and ME ₈ .
and gate circuits G ₁₀ to G ₃₀ .

Here, inputs 1 to 3 of the OR circuit OR are respectively given the outputs of the signal circuit SD ₂ of the configuration diagram of FIG. 4 among the fault detection devices PC ₁ to _{PC 3} .

Next, the operation of the block diagram of FIG. 7 will be explained.

First, when the vehicle T is traveling to the point where substation switching is performed between the last substation of the previous power system and substation A, one of the thyristor switches T ₂ to _{T 5} of the reactive power compensator RPC ₁ , for example, T In this case, the power factor cosθ of _{the AC} input power source SS ₂ is
When it is assumed that 0.90 or less, the signal circuit SD ₂ outputs after the failure detection device PC ₁ in the single line diagram of Fig. 1. On the other hand, since the signal E issues a command when the vehicle T is running at the time when the substation is switched between the previous substation and the A substation, the AND circuit AND ₁₀ outputs an output and compensates for the reactive power. The thyristor switch T ₁ of the device RPC ₁ is turned on until the vehicle T advances to the feed section from the B substation. and,
Vehicle T is the substation switchgear shown in the single line diagram in Figure 1.
When SP ₁ progresses to the point where it is closed, power converters CC ₂₁ , CC ₂₂ and reactive power compensator of substation B
Commands to operate each of the RPCs ₂ are given from the memory circuit ME ₂ in the block diagram of FIG. 3, and the output of this memory circuit ME ₂ is used as an AND _circuit
outputs an output, so the thyristor switch _T1 of the reactive power compensator _RPC2 is turned on.

Furthermore, when the vehicle T advances to the single power supply section of the B substation, the power converter CC ₁₁ of the A substation is activated by a command from the memory circuit ME ₃ in the block diagram of FIG.
The operations of CC ₁₂ and reactive power compensator RPC ₁ are stopped, and the output of NOT circuit NOT ₁₀ becomes zero in response to a command from memory circuit ME _3.Although not shown, the output of memory circuit ME ₃ becomes zero. Memory circuit ME ₁₁ of fault detection device PC ₁ in the single line diagram shown in the figure.
Since the ME ₁₂ is reset, the outputs of the AND circuits AND ₁₀ and AND ₂₀ in the block diagram of FIG. 7 become zero, so the reactive power compensators RPC ₁ and RPC ₂
The respective thyristor switch _T1 is turned off.

In other words, the signal circuit of failure detection device PC ₁
When SD ₂ outputs output, the thyristor switch T ₁ of the reactive power compensator RPC ₁ is turned on until the transition from the section crossing from the previous substation to the A substation to the section where the B substation operates independently, and the reactive power is reduced. Thyristor switch _T1 of compensator RPC ₂ is connected to A substation and B
The reactive power compensator is turned on from the section crossing of the substation until it transitions to the B substation independent operation section, and when the vehicle T advances to the B substation independent power supply section, the reactive power compensator is turned on.
Thyristor switches for RPC ₁ and RPC ₂
T ₁ is turned off.

Next, when the vehicle T crosses the section from the previous substation to the A substation, each of the reactive power compensators RPC ₁ and RPC ₂ when the signal circuit SD ₂ of the failure detection device PC ₁ outputs an output. The operation will be explained using the respective configuration diagrams shown in FIGS. 1 to 7.

First, when the signal circuit SD ₂ outputs an output, only the voltage/current detection circuit PH ₁₁ in the configuration diagram of Fig. 6 outputs.
In addition, since only the voltage/current detection circuit PH ₁ of the control circuit Y ₁ in the single-line diagram in Figure 1 outputs an output, the power grid
The control circuit Y2 shown in the single line diagram in Figure 1 outputs an output via the signal distributor Y11 shown in the configuration diagram in Figure ₆ so that the power factor cosθ on the SS ₁ side is _0.90 or more, so the reactive power compensator RPC Some of the thyristor switches _T2 to _T5 of ₂ are conductive, and as mentioned above, the thyristor switch _T1 of the reactive power compensator _RPC1 is conductive via the block diagram of FIG. 7, so that the signal circuit _SD2 becomes conductive. AC input power supply due to output
It is safe because it compensates for reactive power fluctuations on the SS ₂ side and operates so that the power factor cos θ on the power system SS ₁ side is 0.90 or more, so reactive power fluctuations on the power system SS ₁ side can be suppressed.

Next, with the signal circuit SD ₂ outputting an output, the vehicle T is accelerated and advances to the power supply section where substation A is operated independently, and the power factor cosθ on the power system SS ₁ side improves to 0.95.
To describe the above case, in this case the control circuit
Some of the normal thyristor switches T ₃ to _{T 5} of the reactive power compensator RPC ₁ are activated by the command from Y ₁ or the reactive power compensator RPC ₂ is activated by the command from the signal distributor Y ₁ through the control circuit Y ₂ . By turning off some of the thyristor switches _T2 to _T5 that were conducting, the power system
It is safe because the power factor cosθ on the SS ₁ side can be suppressed to 0.95 or less.

Then, when the vehicle T is further accelerated and advances to the position where the substation switchgear SP ₁ is closed, the first
The AND circuit AND ₇ of the gate control device TS ₂ shown in the single-line diagram in the figure outputs an output based on the command from the signal distributor Y ₁₁ shown in the configuration diagram in Fig. 6, and is also in the power supply section of the B substation. Since the control circuit Y ₂ also outputs an output, the gate distribution circuit GD ₁ of the gate control device TS ₂
operates on the respective outputs of the signal distributor _Y11 and the control circuit _Y2 . On the other hand, some of the normal thyristor switches T ₃ to _{T 5} of the reactive power compensator RPC ₁ are conductive and the reactive power compensator
Since the thyristor switch _T1 of RPC ₁ is conductive, of course, the thyristor switch _T1 of the reactive power compensator RPC ₂ is also conductive via the block diagram of FIG. 7, so that the signal distributor _Y11 and the control circuit _Y1 , the power factor cosθ on the power system SS ₁ side is set to 0.90 by the command from Y ₂ .
It is safe because it is controlled within the range of ~0.95.

Then, when _the vehicle T is further accelerated and advances to the power supply section where substation B is operated independently, _the memory circuit ME ₃ in the block diagram of FIG. Each operation of RPC ₁ stops.

In addition, the fault detection device PC ₁ is activated by the output of the memory circuit ME ₃ .
Since the memory circuit ME ₁₂ is reset, the signal distributor Y ₁₁ and the OR circuit OR in the block diagram of FIG.
Since each output becomes zero, the thyristor switches _T1 of the reactive power compensators _RPC1 and _RPC2 are turned off, and the thyristor switches _{T2 to T7} and the thyristor _Th of the reactive power compensator RPC2 are turned off. The opening/closing and phase are controlled by commands from the control circuit _Y2 .

The above describes the respective effects of the reactive power compensators RPC _{1 and RPC 2} when the signal circuit SD ₂ of the failure detection device PC 1 outputs an output when the vehicle T crosses the section from the previous substation to the A substation. As I explained the operation, if the signal circuit SD ₂ of the failure detection device PC ₂ outputs an output at the time of section crossing from A substation to B substation, the section crossing from B substation to C substation will occur. When the signal circuit SD ₂ of the failure detection device PC ₂ outputs an output, the same operations as those described above are performed, so the description thereof will be omitted.

Next, for example, a failure occurs such that T ₂ of the thyristor switches T ₂ to _{T 5} of the reactive power compensator RPC 1 becomes conductive, and the reactor L of the reactive _power compensator RPC ₁ is controlled by the thyristor T _h . The reactive power compensators RPC ₁ and RPC ₂ in a state where the power factor cosθ on the AC input power supply SS ₂ side is 0.95 or more even when
The respective operations will be explained using respective configuration diagrams of FIGS. 1 to 6.

In this case, the signal circuit of the failure detection device PC ₁
Since SD ₁ outputs an output, only the voltage/current detection circuit PH ₁₁ in the block diagram _of Fig. 6 outputs, so the phase shifter APS of the gate control device TS ₂
operates, and the phase of the reactor L of the reactive power compensator RPC ₂ is controlled by the thyristor T _h , so the power factor cos θ on the power system SS ₁ side is compensated to be 0.98 or less, and the reactive power fluctuation of the power system SS ₁ is reduced. can be suppressed.

Next, the reactive power compensator RPC when the vehicle T is accelerated while the signal circuit SD ₁ of the failure detection device PC ₁ is still outputting and advances to the position where the substation switchgear SP ₁ is closed. ₂ operations in Figures 1 to 6.
This will be explained using the respective configuration diagrams in the figure.

In this case, the memory circuit shown in the block diagram of FIG.
ME ₂ outputs an output, and since it is also the power supply section of substation B, control circuit Y ₂ in the block diagram in Figure 4 also outputs, and signal distributor Y ₁₁ in the block diagram in Figure 6 also outputs. Therefore, commands are given from both the control circuit Y 2 and _{the signal distributor Y 11 to} the OR circuit OR ₃ on the input side of the phase shifter APS of the gate control device TS ₂ .

Since the reactive power compensator RPC ₂ is normal, there is margin in the control of the reactor L to suppress reactive power fluctuations on the AC input power source SS ₂ side in response to changes in the operating status of the power converters CC ₂₁ and CC ₂₂ . , even if commands are given to the input of the OR circuit OR ₃ of the gate control device TS ₂ from both the control circuit Y ₂ and the signal distributor Y ₁₁ , reactive power fluctuations on the power system SS ₁ side can be sufficiently suppressed. It is safe from

Then, when the vehicle T advances to the power supply section where substation B is operated independently, the memory circuit shown in the block diagram of FIG.
Since ME ₃ outputs output, power converter CC ₁₁ ,
Since the operation of CC ₁₂ and the reactive power compensator RPC ₁ is stopped, and the memory circuit ME ₁₁ of the failure detection device PC ₁ is reset, the output of the signal distributor Y ₁₁ becomes zero, so that the reactive power compensator RPC ₂ stops. operates according to commands from control circuit Y ₂ , and AC input power supply SS ₂
side reactive power fluctuations can be compensated for.

The above describes the signal circuit SD ₁ of the failure detection device PC ₁ .
We have explained the operation of each of the configuration diagrams in Figures 1 to 6 when the output is output from the failure detection device.
When the signal circuit SD ₁ of each of PC ₂ and PC ₃ outputs an output, the same operation as described above is performed, so a description thereof will be omitted.

That is, if any of the failure detection devices PC ₁ to _{PC 3} outputs an output in the single line diagram of FIG.
It is possible to suppress reactive power fluctuations on the side of the power system SS ₁ by operating the reactive power compensator connected between the feed voltages where the vehicle T does not exist within the same power system SS ₁ .

FIG. 8 is a single line diagram showing another embodiment of the present invention applied to a linear motor power supply system in which there are four substations per power system and a reactive power compensator is installed near the middle of the two substations. Since the symbols from A to C substations are the same as in the single line diagram of FIG. 1, their explanation will be omitted. The power converters CC ₄₁ and CC ₄₂ of group D are connected to the feeders F ₄₁ and F ₄₂ , and a section S and a substation switchgear SP ₃ are provided near the middle of the C substation and the D substation. Also, AC input power supply
Power converters CC ₄₁ and CC ₄₂ are connected to SS ₂ via power transformers T _r41 and T _r42 . Further, the reactive power compensators RPC ₁ to RPC ₃ are connected between two of the substations A to D, similarly to the sections S ₁ to S ₃ .

The reactive power compensator RPC ₁ operates in the range from the time when substations are switched between the last substation of the previous power system and the A substation (not shown) to the position where the substation switchgear SP ₁ is opened and closed, and is disabled. power compensator
RPC ₂ operates in the range from the time when substation switchgear SP ₁ is closed to the position where substation switchgear SP ₃ is opened and closed, and the reactive power compensator RPC ₃ operates when substation switchgear SP ₃ is closed. It operates in the range from the point in time to the point in time when the substation is switched between the D substation and the first substation in the subsequent power system (not shown), and also operates when the substation switchgear SP ₂ is opened and closed.

Next, the operation of the single line diagram of FIG. 8 will be explained using the control circuit block diagram shown in FIG. 9.

The symbols in the block diagram of FIG. 8 are the same as those in the block diagram of FIG. 3, so a description thereof will be omitted, and the control circuits Y ₁ to Y ₃ and gate control devices TS ₁ to _{TS 3} are the same as those in the block diagram of FIG. 4. Use the same one.

First, substation switchgear SP ₁ , power conversion equipment
The operations of CC ₁₁ , CC ₁₂ and reactive power compensator RPC ₁ are the same as those in the single-line diagram in Fig. ₁ , so their explanation will be omitted. I will explain from the case.

Now, the feeder section switch connected to the propulsion coil directly below the substation switchgear SP ₂ is connected to SW _oko-1 and SW _oko.
In this case, the memory circuit ME ₂₄ outputs an output, so _{the substation switchgear SP 2 is} closed and the memory is stored via the primary delay circuit PDC ₂ . Circuit ME ₂₅ gives an output. When the memory circuit ME ₂₅ outputs an output, the power converter CC ₃₁ , which had been waiting until then in a state matching the speed of the vehicle T with the signal from the position detector PD ₃ ,
When CC ₃₂ operates, reactive power compensator RPC ₃ operates via OR circuit OR ₂₀ .

On the other hand, since the power converters CC ₂₁ and CC ₂₂ and the reactive power compensator RPC ₂ have been operating since the time when the substation switchgear SP ₁ was closed, the reactive power compensators RPC ₂ and RPC ₃ are activated at the time of substation switching. Since they operate simultaneously, it is possible to compensate for reactive power fluctuations on the AC input power supply SS ₂ side due to load fluctuations.

Then, when the vehicle T reaches the position where the feeder section switch SW _oko+1 is closed, the memory circuit ME ₂₆ outputs an output, so the operation of the power converters CC ₂₁ and CC ₂₂ is stopped, and the memory circuit ME ₂₂ is reset, so one input of the OR circuit OR ₁₀ becomes zero, but the other input is given the output of the memory circuit ME ₂₅ , so the OR circuit OR ₁₀ continues to output, so reactive power compensation is achieved. Device RPC ₂ continues to operate.

Also, when the memory circuit ME ₂₆ outputs an output, the OR circuit OR ₃₀ outputs an output, so the reactive power compensator RPC ₃
From the time when the operation of the substation switchgear SP 2 is stopped and the substation switchgear SP ₂ is opened, the reactive power compensator RPC ₂ compensates for the operation of the power converters CC ₃₁ and CC ₃₂ in the power system SS _1.
Compensate for side reactive power fluctuations.

That is, when the vehicle T passes through the section S ₂ , the power converters CC ₂₁ , CC ₂₂ and CC ₃₁ , CC ₃₂ are both operating, so the vehicle T can be operated stably without thrust pulsation, and the reactive power is reduced. Since the compensators RPC ₂ and RPC ₃ operate together, it is possible to compensate for reactive power fluctuations on the power system SS ₁ side with respect to changes in the operating states of the power converters CC ₂₁ , CC ₂₂ and CC ₃₁ , CC ₃₂ .

Then, when the vehicle T advances until the substation switchgear SP ₃ is closed, the memory circuit ME ₂₇ outputs an output, and the power converters CC ₄₁ and CC ₄₂ operate, and the reactive power is restored via the OR circuit OR ₂₀ . Compensator RPC ₃ operates. On the other hand, power converter CC ₃₁ ,
CC ₃₂ and reactive power compensator RPC ₂ continue to operate from the time when substation switchgear SP ₂ is closed.

Here, E and F are the same as the block diagram in FIG. 3, and the circuits after the control circuit Y ₄ other than the position detector PD ₄ , the feeding section switching device SC ₄ and the power converters CC ₄₁ and CC ₄₂ is connected to the next power system.

If the substation interval is 20 km and the train interval is every other substation, then if there is a train in the power supply section of substation A, there will also be a train in the power supply section of substation C, so Then the power converter
CC ₁₁ , CC ₁₂ and reactive power compensator RPC ₁ respectively, and power converter in the power supply section of C substation.
CC ₃₁ , CC ₃₂ and reactive power compensator RPC ₂ each operate. In addition, if a train exists in the power supply section of substation B, there will also be a train in the power supply section of substation D, so in the power supply section of substation B, the power converter
CC ₂₁ , CC ₂₂ and reactive power compensator RPC ₂ operate, and in the power supply section of substation D, the power converter
CC ₄₁ , CC ₄₂ and reactive power compensator RPC ₃ each operate.

In other words, when a train exists in the power supply section of two substations within the same power system SS ₁ , the specified power converter and reactive power compensator operate together, so the vehicle T can be operated stably without thrust pulsation. It is also possible to compensate for reactive power fluctuations due to load changes on the power system SS ₁ side.

Next, in the single line diagram of FIG. 8, during operation when a vehicle T is present in each power supply section of the A substation and the C substation, T ₂ of the thyristor switches T ₂ to _{T 5} of the reactive power compensator RPC ₁ is activated. The operation when the thyristor T h goes out of arc or the thyristor T _h becomes conductive will be explained using the respective configuration diagrams of FIGS. 4 to 7.

First, the voltage and current detection circuit of the single line diagram in Figure 8
The configuration diagram shown in FIG. 6 is used for the PH and signal distributor Y, similar to the single line diagram in FIG. 1.

Further, the signal _K1 of the control circuit _Y1 is not given a command when the vehicle T is present in the power supply section of the A substation, and is not given a command when the vehicle T is present in the power supply section of the B to D substations. The signal _K1 of the control circuit _Y2 is not given a command when the vehicle T exists in the power supply section of substations B and C, and when the vehicle T exists in the power supply section of A and D substations. A command is given to the signal _K1 of the control circuit _Y3 when the vehicle T is present in the power supply section of the A to C substations, and a command is given when the vehicle T is present in the power supply section of the D substation. is not given.

On the other hand, the AND circuit of the gate control device TS ₁
One of the input signals H ₁ and I 1 of AND ₇ and AND ₈ is the output signal H ₁ and I ₁ of the signal divider Y ₁₃ in FIG.
I ₁ , and the output and signal distributor of the memory circuit ME ₂₁ in the block diagram of Fig. 9, which closes the substation switchgear SP ₁ .
The output of the AND circuit and memory circuit ME ₂₁ (not shown) which receives the output signal H ₁ of Y ₁₂ as input, and the signal distributor Y ₁₂
The outputs of logical sum circuits (not shown) each having inputs of logical product circuits (not shown) receiving the output signal I ₁ of are given as inputs.

AND circuit AND ₇ of gate control device TS ₃ ,
The respective input signals H ₁ and I ₁ of AND ₈ are connected to the output signals H ₁ and I ₁ of the signal distributor Y ₁₁ of FIG. 6 and the storage circuit of the block diagram of FIG. 9 which closes the substation switchgear SP ₂ . Output of ME ₂₄ and output signal of signal distributor Y ₁₂ H ₁
AND circuit and memory circuit (not shown) that input
The outputs of an OR circuit (not shown) which receives the respective outputs of an AND circuit (not shown) which receives the output of ME ₂₄ and the output signal _I1 of the signal distributor Y ₁₂ are given.

AND circuit AND ₇ of gate control device TS ₂ ,
The respective input signals H ₁ and I ₁ of AND ₈ are connected to the power grid
Since the reactive power compensator RPC ₂ is always operating in SS ₁ , no commands are given from the signal distributors Y ₁₁ and Y ₁₃ .

On the other hand, the input signal J ₁ of each OR circuit OR ₃ of the gate control devices TS ₁ to TS ₃ is the input signal H ₁ and each of the AND circuits AND ₇ and AND ₈ described above.
It was configured so that the same commands as I ₁ were given.

Also, the AND circuit in the block diagram of FIG.
Among the inputs of AND ₁₀ to AND ₃₀ , the memory circuits ME ₂ , ME ₃ , ME ₅ , ME ₆ and
ME ₈ is the memory circuit shown in the block diagram of Fig. 9.
Directives are given on behalf of ME ₂₂ , ME ₂₃ , ME ₂₅ , ME ₂₆ and ME ₂₉ .

The respective input signals H ₁ , H ₂ and I 1 , I ₂ of the AND circuits AND ₇ and AND ₈ of the control circuits Y ₁ to _{Y 3} in the single line diagram of FIG. ₈ and the block diagram of FIG. 7 When the inputs of the AND circuits AND ₁₀ to AND ₃₀ are configured as described above, the failure of the reactive power compensator RPC ₁ is the same as the failure of the reactive power compensator RPC ₁ in the single-line diagram of Fig. 1. This operation can compensate for reactive power fluctuations on the power system SS ₁ side.

In other words, when the vehicle T is present in each power supply section of the A and C substations, the reactive power compensator
If RPC ₁ fails, only Y ₁₁ of the signal distributors Y ₁₁ to _{Y 13} in the block diagram of Fig. 6 will output, and this output will cause the AND circuit of gate control device TS ₃
Since any one of AND ₇ , AND ₈ and the logical sum circuit OR ₃ outputs an output, some of the thyristor switches T ₂ to _{T 5} of the reactive power compensator RPC ₃ or the thyristor T _h are phase-controlled or connected to the power system. Suppresses reactive power fluctuations on the SS ₁ side. The above has explained the operation of each of the configuration diagrams in FIGS. 4 to 7 when the failure detection device PC ₁ outputs an output, but when each of the failure detection devices PC ₂ and PC ₃ outputs an output Since the same operation as described above is performed, the explanation will be omitted.

That is, if any of the failure detection devices PC ₁ to _{PC 3} outputs an output in the single line diagram of FIG.
It is possible to suppress reactive power fluctuations on the side of the power system SS ₁ by operating the reactive power compensator connected to the power feeding section where the vehicle T does not exist within the same power system SS ₁ .

As explained in detail above, according to the embodiment of the present invention shown in FIG.
One reactive power compensator is controlled by the output that detects the phase difference between the voltage and current on the AC input power supply side in response to changes in the operating status of the AC input power supply, and the power factor on the AC input power supply side is adjusted.
It can be improved to a range of 0.90 to 1.0, and when the reactive power compensator is abnormal, the phase difference detection device detects this and uses this output to control other adjacent reactive power compensators to correct the same. This has the advantage of being able to continuously compensate for reactive power fluctuations in the power system.

According to another embodiment of the present invention shown in FIG. 8, one reactive power compensator is installed between two substations, and the phase difference between voltage and current is installed on the input side of the substation closer to the power system. A first device for detecting and a second device for detecting a phase difference between voltage and current are provided closer to the power system than the reactive power compensator, and the reactive power compensator is connected to the output of the second device. The power factor of the power system can be improved to a range of 0.90 to 1.0 by controlling the power factor of the power system, and when the reactive power compensator is abnormal, the second device detects this and uses this output to improve the power factor of the power system to a range of 0.90 to 1.0. There are effects such as being able to continuously compensate for reactive power fluctuations in the same power system by controlling reactive power compensators in which no vehicles are present.

In addition, according to the embodiments shown in FIGS. 1 and 8, when the reactive power compensator is normal, the power factor on the AC input power source side with respect to changes in the operating state of the power converter is reduced from 0.90 to 1.0 using the minimum amount of reactive power compensator. In addition, it is possible to continuously compensate for reactive power fluctuations in the power system by operating the reactive power compensator when there is no vehicle in the same power system in the case of an abnormality in the reactive power compensator. effective.

According to the present invention, when the power factor is abnormal or when the reactive power compensator is abnormal, the reactive power compensator connected to the power feeding section where no vehicle is present in the same power system assists the vehicle in the same power system. It is possible to continuously compensate for reactive power fluctuations, and the probability that the power factor becomes abnormal can be significantly reduced.

Furthermore, there is no need to add any new equipment, and it is economical because existing equipment can be used.

[Brief explanation of drawings]

Fig. 2 is a configuration diagram for one phase of a reactive power compensator applied to the present invention, Fig. 1 is a single line diagram of a power supply system for a linear motor showing an embodiment of the present invention, and Fig. 3 is a diagram similar to that shown in Fig. 1. 4 is a block diagram for operating each of the substation switchgear, power converter, and reactive power compensator; FIG. 4 is a specific circuit configuration diagram of the control circuit, failure detection device, and gate control device shown in FIG. 1; FIG. 5 is an explanatory diagram of the operation of the circuit configuration diagram in FIG. 4,
6 is a specific circuit configuration diagram of the voltage/current detection circuit and signal distributor shown in FIG. 1, FIG. 7 is a circuit configuration diagram for operating a part of the reactive power compensator, and FIG.
The figure is a single line diagram of a power supply system for a linear motor showing another embodiment of the present invention, and FIG. This figure shows a configuration diagram of each of the block diagrams. SS ₁ ... Power system, SS ₂ ... AC input power supply, A
~D... Each substation, SP ₁ ~ SP ₃ ... Substation switchgear, CC ₁₁ , CC ₁₂ ... Power conversion equipment of A substation,
CC ₂₁ , CC ₂₂ ...B substation power conversion equipment, CC ₃₁ ,
CC ₃₂ ...C substation power conversion equipment, CC ₄₁ , CC ₄₂
...D substation power conversion equipment, RPC ₁ to RPC ₃ ...
Reactive power compensator, Y, Y ₁₁ to _{Y 13} ... Signal distributor, Y ₁ to _{Y 3} ... Control circuit, PH, PH ₁₁ to _{PH 13} ...
…Voltage and current detection circuit, PC ₁ to _{PC 3} … Failure detection device, TS ₁ to TS ₃ … Gate control device, SC ₁ to _{SC 3} …
...Feeding section switching device, PD ₁ ~ _{PD 3} ... Position detector, SW ₁ - SW _oo ... Feeding section switch, VD ₁ ...
Voltage waveform shaping circuit, ID ₁ ……Current waveform shaping circuit,
T ₁ to T ₇ ... Thyristor switch, C ₁ to C ₇ ... Capacitor, T _h ... Phase control thyristor, L...
...Reactor.

Claims (1)

[Scope of Claims] 1. A plurality of power converters supplied with power from the same power system, and dividedly installed in a large number of sections on the track side,
A plurality of propulsion coils each supplied with power by the power converter, means for detecting the power factor or its equivalent, and a reactive power compensator arranged for each power converter according to the output of the detecting means. In a power supply device for a linear motor comprising means for controlling a reactive power compensator disposed in a power conversion device supplying power to the vehicle, the power factor of the power conversion device supplying power to the vehicle or an equivalent amount thereof; means for suppressing the reactive power of the power converter that is supplying power to the vehicle by assisting with a reactive power compensator disposed in the power converter that is not supplying power to the vehicle in the event of an abnormality. Power supply device.