Coordinated test system of step load and reactive power rejection in phase-modulator group grid involvement test

Abstract

The application relates to the technical field of high-voltage power transmission and phase modifier testing, in particular to a coordinated test system for reactive power shedding and step load of grid-connected test of a phase modifier unit, which comprises: a power grid simulation device, which is used for simulating basic current supply of an alternating current power grid and is connected to a PCC bus through transmission line impedance; a fault injection device, which is connected to the PCC bus and is used for simulating three-phase short circuit generated by devices connected to the PCC bus to generate a short circuit signal; and a power step device, which is used for adjusting a step amplitude to generate an amplitude signal. According to the technical scheme, the control module guides the fault injection device and the power step device to randomly inject a coordinated mutation signal (such as a combination of three-phase short circuit and load step) into the PCC bus, so that the phase modifier unit can be simulated in a high-fidelity manner to be subjected to unpredictable concurrent or continuous disturbance working conditions possibly encountered in actual complex power grid operation.

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