JP3141432B2 - Generator output limiting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator output limiting device for operating the output of one or more generators within upper and lower limits.

[0002]

2. Description of the Related Art In private power generation facilities that operate in parallel with a power receiving system, power receiving power constant control for keeping the power at the power receiving point as small as possible is often performed.

[0003] In this control method, there is a method of controlling the received power while balancing the output of one or more generators. However, when the load in the plant increases, the rated output of the generator is exceeded. Must be killed under the condition of the rated output of the generator, and a killing circuit for receiving power control is provided.

[0004]

By the way, in order to extinguish the received power constant control, the output of the generator is detected and the received power constant control is stopped at the rated load. Therefore, a generated power detector, a comparator, a relay, and the like are used. A complicated and expensive killing circuit must be built. Further, when the received power constant control is not performed, the generator output may exceed the rating due to disturbance of the system, so a constant generated power control device must be provided.

The present invention has been made in view of such a conventional problem, and an object thereof is to eliminate the necessity of an extinguishing circuit for constant control of received power, and to set a plurality of upper and lower limits by one. An object of the present invention is to provide a generator output limiting device capable of limiting the output.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a power receiving system.
This is an output limiting device for the generator of a private power generation facility that operates in parallel.
There are a received power constant control unit for outputting reception power constant control signal by detecting a deviation between the detected received power set value received power, generated power and the power generator by detecting a generated power of each generator A load balance control unit that detects a deviation from the average output, and controls the generator so that the received power is constant based on a deviation between the deviation signal and the received power constant control signal; an average power of the generator and the generator output A deviation from the upper limit set value and the lower limit set value is detected, and when the average power of each generator exceeds the upper limit set value or the lower limit set value, the upper limit or lower limit is given to the load balance control unit in preference to the received power constant control signal. the received power constant control of the outputs the output limit signal load balance control unit is a shall which have a output limiting section to upper or lower output limiting control.

[0007]

The received power constant control section detects a deviation between the received power and the received power set value and outputs a received power constant control signal.

The load balance control unit detects a deviation between the power generated by each generator and the average output of each generator, obtains a power generation increase / decrease command for balancing the power generated by each generator, and obtains a power generation increase / decrease command and a received power. By controlling the generator with the constant control signal, the balance of the generated power and the constant control of the received power are performed.

The output limiter compares the average power of the generator with the generator output upper limit set value and the generator output lower limit value, and when the generator output average value exceeds the upper limit set value or the lower limit set value, the received power constant control output. , And outputs an upper limit or lower limit output limitation signal to the load balance control unit. For this reason, the received power constant control of the load balance control unit is replaced with upper limit or lower limit output limitation control.

[0010]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit of a device for limiting the output of a generator in a private power generation facility. In FIG. 1, reference numeral 10 denotes a received power constant control unit that outputs a received power constant control signal, 20 denotes an output limiting unit that outputs a generator output limiting control signal, and 30 ₁ to 30 ₁ .
3n indicates a load balance control unit of the No. 1 to No. n generators.

The received power control unit 10 is provided with the received power setter 1
Detecting a deviation between the received power p _r detected with the second receiving power setting s _r with the received power detecting circuit 14 in the deviation detection circuit 16 outputs the reception power constant control signal a.

The output limiter 20 detects a deviation between the upper limit set value s ₁ of the upper limit setter 21 of the generated power and the average power d of each generator from the amplifier A ₇ by a deviation detection circuit 23, and outputs the average power d.
Amplifier A ₄ and the diode D ₁ when but exceeds the upper limit set value s ₁
And maximum output limiting circuit for outputting a negative upper output limit signal b from the negative signal output circuit 25 consisting of, detecting a difference between the lower limit set value s ₂ of the lower limit setter 22 and a generator average power d in deviation detecting circuit 23 and consists of the amplifier a ₆ and the diode D ₂ when the average power d exceeds the upper limit set value s ₂ positive signal output circuit 2
6 and a lower limit output circuit for outputting a positive lower limit output limiting signal c. The upper and lower limit output limiting signals b and c have a higher priority than the received power constant control signal a, and the load balance controller 3
0 _{1 to} 30n.

The load balance control unit 3 of the No. 1 to No. n generators
0 ₁ to 30 _n detects the generated power p ₁ ~p _n in each generated power detecting circuit 32 ₁ to 32 _n, the generated power and the generated power of the resistor R, R 1/2 and the generator output The average value d ₁ ~d _n
Deviation detected by the deviation detecting circuit 34 ₁ to 34C _n to the contactor contacts and the deviation signal (changeable power command) e ₁ ~e _n 52G1
Input through a _{2 ~52Gn 2} control signal a or b or c
Deviation detected by the deviation decreasing circuit 36 ₁ ~ 36 _n to the, Kavanagh command 65R ₁ ~65R _n, 65L ₁ ~6 to input the deviation signal f ₁ to ON-OFF controller 38 ₁ to 38 DEG _n
Output 5 _n . The contactor contacts 52G1 _1, 52G
Each average value d ₁ at ON of n _1, d _n is output to the amplifier A ₇ having an average is the average power becomes d output limiting section 20.

With the above configuration, the output limiting unit 20 normally does not output the upper and lower limit output limiting signals b and c, and since each of the contactors 52G is energized, the deviation amplifying circuit is provided. 36 _{1 to} 36 _n are deviation signals e _{1 to} e between the received power setting s _r , the deviation signal a of the detection p _r , the generated powers p _{1 to} p _{2 of the} No. 1 and No. n generators, and the average power d, respectively. Deviation f _{1 of 2}
Controls ON-OFF controller 38 ₁ ~38n by ~f _n, the load increase or decrease command 65R ₁ ~ to the governor of the generator
65R _n, or 65L outputs a _{1 ~65R n} performs reception power constant control that balance of the generator output.

Next, the average power d of each generator is set to the upper limiter 2
Exceeds the upper limit set value s ₁ 1 When output upper limit output limiting signal b, the deviation amplifier circuit in preference to the deviation signal a 36 ₁ ~ 36 _n
Since input to the deviation amplifier circuit 36 ₁ ~ 36 _n controls the ON-OFF controller 38 ₁ to 38 DEG _n by deviation f ₁ ~f _n respective upper output limit signal b and the deviation signal e ₁ to e _n,
Generated power limit control generated power so as not to exceed the upper limit value s _1.

Further, the average power d outputs a lower limit output limit signal c exceeds the lower limit set s ₁ lower limit setter 22 of each generator, deviation amplifier circuit in preference to the deviation signal a 36 ₁ ~36 _n
, The deviation amplification circuits 36 _{1 to} 36 _n are turned on by the deviation between the lower limit output limiting signal c and the deviation signals e ₁ and e ₂ , respectively.
And controls the -OFF controller 38 ₁ ~38 _n, limiting controls the generated power so that the generated power does not exceed the limit value.

In the above embodiment, the output of the generator of the private power generation equipment is limited. However, the present invention can be used, for example, for limiting the output of the generator for water level adjustment and water amount adjustment control of the hydroelectric power generation equipment. In addition, if the detection unit detects the reactive power and sends a control signal to an automatic voltage controller (AVR), it can be used to limit the reactive power.

[0019]

Since the present invention is configured as described above, the following effects can be obtained.

(1) Killing of the received power constant control can be achieved without providing a complicated killing circuit by providing the output limiting section.

(2) The output can be limited without contact without using a relay or the like. Therefore, (3) a plurality of outputs can be limited by setting one upper and lower limit.

(4) Even if the number of generators is increased, only the addition of the load balance control unit can be used without changing the output limiting unit.

(5) The output can be limited by one generator or a plurality of generators.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a generator output limiting device according to an embodiment of the present invention.

[Explanation of symbols]

10: Received power constant control unit, 12: Received power setting unit, 1
4: received power detection circuit, 16, 23, 24, 34, 44
... Deviation detection circuit, 20 output limiter, 21 upper limit output setting device, 22 lower limit output setting device, 25 negative signal output circuit,
26: positive signal output circuit, 30 to 30n: load balance control unit, 32, 42: generated power detection circuit, 36, 46: deviation amplifier circuit, 38, 48: ON-OFF controller.

Claims (1)

(57) [Claims] 1. An in- house power generation system that operates in parallel with a power receiving system
An output limiting device for a generator, which detects received power, detects a deviation from a set value of received power, and outputs a received power constant control signal, and controls a generated power of each generator. A load balance control unit that detects and detects a deviation between the generated power and the average output of each generator, and controls the generator so that the received power is constant by a deviation between the deviation signal and the received power constant control signal; Detects the deviation between the average power of the generator and the generator output upper limit set value and the lower limit set value, and overrides the received power constant control signal when the average power of each generator exceeds the upper limit set value or the lower limit set value. output limitation unit to the upper or lower output limit control received power constant control of outputting the upper or lower output limit signal load balance control unit to the load balancing control unit, the generator was characterized Rukoto which have a capital Output limiting device.