JP2920982B2 - Electronic load device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic load device for a test load of an AC power supply device.

B. Summary of the Invention The electronic load device of the present invention connects a forward conversion circuit to the power supply device, creates an output current command from the output voltage of the power supply device, the effective component command and the invalid component or harmonic component command, and creates a forward conversion circuit. In addition to controlling the output current command, a reverse conversion circuit is connected to the forward conversion circuit, and the effective regenerative current command is obtained from the deviation between the input DC voltage of the reverse conversion circuit and the set value and the power supply system voltage connected to the reverse conversion circuit. The reverse conversion circuit is controlled by this effective regenerative current command to regenerate the effective component to the power supply system and to flow the inactive component or harmonic component between the power supply device side and the forward conversion circuit. is there.

C. Conventional Technology Conventionally, as a test load of an AC power supply device such as a CVCF device, a water resistance is generally used as an effective component, and a reactor is used as an ineffective component. Also, since the load of the CVCF device is a rectifying load, as shown in FIG.
A load 30 having a water resistance 32 connected to a diode or rectifier 31 is used.

D. Problems to be Solved by the Invention However, when the above-described test load is used, disadvantages such as the fact that the effective component power is consumed as heat due to water resistance and the like, and that it is difficult to perform operations such as high-speed load fluctuation. is there.

The present invention has been made in view of such problems, and an object of the present invention is to make it possible to arbitrarily instantaneously set the magnitude of a load and a power factor or a harmonic component, and to further reduce the power consumption. An object of the present invention is to provide an electronic load device that requires less loss.

E. Means for Solving the Problems The electronic load device of the present invention is a forward conversion circuit having a self-extinguishing function in which a DC filter is connected to an output side connected to a power supply device via an AC filter; A reverse conversion circuit having a self-extinguishing function connected to the filter and connected to the power supply system via an AC filter on the output side, and forward-converted by the output voltage signal of the power supply device, the effective component command, and the invalid component or harmonic component command. A first current command signal generator for generating an output current command of the circuit; and a pulse pattern for driving the forward conversion circuit from the deviation between the output current signal of the power supply device and the output current command from the first current command signal generator. A first drive signal generator to be produced; a second current command signal generator to produce an effective regenerative current command from a deviation between an input DC voltage signal and a set value of the inverse conversion circuit and a system voltage signal; In which the effective component regenerative current command deviation of the output current signal of the road and the second current command signal generator becomes more and second drive signal generator to produce a pulse pattern for the reverse conversion circuit drives.

F. Operation The first current command signal generator generates an output (load) current command based on the output voltage signal of the power supply device, the effective component command, and the invalid component or harmonic component command. The first drive signal generator generates a pulse pattern for driving the forward conversion circuit from a deviation between the output current signal of the power supply device and the output current command of the first current command signal generator, and controls the forward conversion circuit to eliminate the deviation. I do.

This effective component is regenerated to the power supply system using the inverse conversion circuit. That is, the second current command signal generator generates an effective regenerative current command from the deviation between the output voltage signal of the DC filter and the set value and the system voltage signal. The second drive signal generator generates a pulse pattern for driving the reverse conversion circuit from the deviation between the output current signal of the reverse conversion circuit and the effective regenerative current command from the second current command signal generator, and the input direct current of the reverse conversion circuit. The voltage is controlled to be constant, and all effective components are regenerated to the power supply system.

Therefore, a desired test load can be applied to the power supply device by changing the effective component command and the invalid component or harmonic component command of the first current command signal generator. The ineffective component or harmonic component flows to the power supply through the forward conversion circuit.

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

Embodiment 1 In FIG. 1, reference numeral 11 denotes a CVCF device, and 13 denotes an AC filter 12.
, A forward conversion circuit having a self-extinguishing function connected to the CVCF device via a DC filter 14, a reverse conversion circuit having a self-extinguishing function connected to a forward conversion circuit 13 via a DC filter 14, and 17 an AC filter 16 Is a power supply system in which the effective power is regenerated from the inverse conversion circuit through the power converter.

18a is voltages V ₁ detected by the voltage detection transformer 21 the output voltage of the CVCF device 11 is inputted, the reactive component command and the effective component command Ps
A current command signal generator that generates an output current command value is ₁ by Qs, 20 matches the current I ₁ detected by the current transformer 22 with the output current of the CVCF device 11 and the current command value is ₁ from the signal generator 18a. This is a hysteresis comparator which receives a deviation and forms a pattern for operating the forward conversion circuit 13 so that the deviation becomes zero.

25 is a voltage detection transformer that detects the output voltage of the AC filter 16
And voltage V ₂ detected at 28, is deviation against the set voltage V _DS voltage V _D detected by the DC voltage detector 23 to the output side voltage of the DC filter 14 is input, the effective fraction regenerative power factor 1,0 current command signal generator to produce a current command iS _2, 27 is the current command signal generator current command iS ₂ and deviation of matching the current I ₂ which the output current detected by the current transformer 29 of AC filter 16 is input This is a hysteresis comparator that creates a pattern for operating the inverse conversion circuit 15 so that this deviation becomes zero.

According to this embodiment, the signal generator 18a is made the output current command IS ₁ as the effective component and the reactive component as commanded by the voltage V ₁ and the effective component command Ps and reactive component command Qs, the forward conversion circuit 13 this since controlled by the hysteresis comparator method by a command iS _1, the output current I ₁ of the CVCF device 11 current command iS ₁
Is controlled to follow the vibration. Although the output of the forward conversion circuit 13 has a pulse shape, unnecessary frequency components are removed through the AC filter 12, so that there is no influence.

Inverse conversion circuit 15 using the effective partial regenerative current command IS ₂ from the signal generator 25 is controlled by a hysteresis comparator type, power supply path shown an effective amount to A so that the output-side DC voltage V _D of the DC filter is constant Regenerate to line 17. The invalid portion flows through the route indicated by B.

Embodiment 2 In FIG. 2, this embodiment corresponds to Embodiment 1 (FIG. 1).
Instead of the voltage V ₁ and than the effective component command Ps and reactive component command Qs produce an output current command value is1 current signal generator 18a, voltages V ₁
Output current command value is from the effective component command Ps and the harmonic component command Hs
₁ 'using a signal generator 18b. Note that components other than the current command signal generator 18b are the same as those in the first embodiment, and therefore, are denoted by the same reference numerals, and redundant description will be omitted.

According to this embodiment, since the output current command value is ₁ ′ is based on the effective component command Ps and the harmonic component command Hs, the effective component and the harmonic component according to the command pass through the lapses A and C, respectively. The flow and CVCF device can be loaded with the desired effective and harmonic components.

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

The magnitude and power factor (claim (1)) or harmonic components (claim (2)) of the load can be set arbitrarily.

By changing the set value, the load can be changed instantaneously.

Since the effective component is regenerated to the power supply system, power loss is small and a large capacity load test can be easily performed.

[Brief description of the drawings]

1 and 2 are block circuit diagrams of an electronic load device showing different embodiments of the present invention, respectively, and FIG. 3 is a block circuit diagram of a conventional load device. 11… CVCF power supply unit, 12,16 …… AC filter, 13 ……
Forward conversion circuit, 14 DC filter, 15 reverse conversion circuit
17 ... Power supply system, 18a, 18b ... Current command signal generator, 20,
27 ... Hysteresis comparator, 25 ... Drive signal generator.

Claims (2)

(57) [Claims] 1. A forward conversion circuit having a self-extinguishing function in which a first AC filter connected to a power supply device is connected to an input side and a DC filter is connected to an output side, and an output side connected to the DC filter and having an output side. A reverse conversion circuit having a self-extinguishing function connected to the power supply system via a second AC filter; a first current command signal for generating an output current command based on an output voltage signal of the power supply device and an effective component and an invalid component command A first drive for generating a forward conversion circuit driving pulse pattern by inputting a deviation between an output current signal of a power supply device and an output current command from the first current command signal generator; A signal generator, and a deviation between an input DC voltage signal and a set value of the inverse conversion circuit and a system voltage signal are input to generate an effective regenerative current command.
And a deviation between the output current signal of the inverse conversion circuit and the effective regenerative current instruction from the second current instruction signal generator is input to generate a pulse pattern for driving the inverse conversion circuit and perform inverse conversion. An electronic load device comprising a first drive signal generator for driving a circuit. 2. A forward conversion circuit having a self-extinguishing function in which a first AC filter connected to a power supply device is connected to an input side and a DC filter is connected to an output side, and an output side connected to the DC filter and having an output side. An inversion circuit having a self-extinguishing function connected to a power supply system via a second AC filter; and a first current command for generating an output current command based on an output voltage signal of the power supply device and an effective component / harmonic component command. A signal generator, a deviation of an output current signal of a power supply device and an output current command from the first current command signal generator, and a pulse pattern for driving the forward conversion circuit for driving the forward conversion circuit; A drive signal generator, a second input of a deviation between an input DC voltage signal and a set value of the inverse conversion circuit and a system voltage signal to generate an effective regenerative current command;
And a deviation between the output current signal of the inverse conversion circuit and the effective regenerative current instruction from the second current instruction signal generator is input to generate a pulse pattern for driving the inverse conversion circuit and perform inverse conversion. An electronic load device comprising a first drive signal generator for driving a circuit.