TECHNICAL FIELD

This application relates to a testing device of an inverter device.

BACKGROUND

Conventionally, as described, for example, in International Publication No. 2015/132960, a testing device for testing an inverter device is known.

CITATION LIST

Patent Literature

[PTL1] International Publication No. 2015/132960

SUMMARY

Technical Problem

One of the test items of the inverter device is an instantaneous voltage abnormality test. More specifically, the instantaneous voltage abnormality test is a test of an operation function which causes an inverter device in a grid connection system to continue operation without being disconnected from an electric power grid even if an “instantaneous voltage change” may occur in the electric power gird.

The testing device of the inverter device may have a system configuration having a power circulation type. The power circulation system includes a power supply device generating DC power supply, a tested inverter device to be tested, and a filter circuit consisting of a reactor and a capacitor, and the power circulation system has a configuration in which the power supply device and the tested inverter device are connected via the filter circuit in a circular manner. The power circulation type system maintains balance between output of the tested inverter device and output of the power supply device, and thereby almost all of electric power can be circulated through the power supply device, the tested inverter device and the filter circuit. This results in that power consumption during a test can be suppressed.

In the configuration of the power circulation type system, the instantaneous voltage abnormality test described above may be conducted. In this case, an AC power supply changes instantaneously its voltage greatly, and the tested inverter device also executes output adjustment in response to this voltage change. At this time, an influence of the instantaneous voltage abnormality affects to control in the power supply device with a time delay, and the power supply device has a delay in control response. The delay in the control response in the power supply device causes a problem that the power circulation may be imbalanced.

The present application has been made to solve the problems as described above, and an object thereof is to provide an improved testing device of an inverter device which is improved to suppress a control imbalance due to a response delay in a test.

Solution to Problem

A testing device of an inverter device according to the present application includes:

a power supply device including an AC-DC conversion circuit for converting AC power received from an AC power supply into DC power and a control part for controlling the AC-DC conversion circuit; and

a filter circuit interposed between a tested inverter device to be tested and the power supply device, having a reactor and a capacitor, and delivering the DC power output from the power supply device to the tested inverter device,

wherein the control part is configured to execute output adjustment of the AC-DC conversion circuit when a test start signal is generated to start an instantaneous voltage abnormality test which is a test to change magnitude of power supply voltage of the AC power supply in a predetermined direction being either one of increase or decrease during operation of the tested inverter device and the power supply device.

Advantageous Effects

According to the present application, the control part of the power supply device can execute a control correction promptly in response to the test start signal when the test start signal is generated, and this makes it possible to suppress control imbalance due to a response delay in the power supply device at the start of the test.

