TEST SYSTEM FOR SIMULATING DIRECT-CURRENT BIAS OF CONVERTER TRANSFORMER

摘要

A test system for simulating the direct-current bias of a converter transformer. The test system comprises an RTDS simulation system of a direct-current power transmission system for simulating the direct-current bias operating condition of the converter transformer, wherein the RTDS simulation system is connected to an RTDS real-time digital simulator and a converter transformer protection device; and a bias resistor is connected in series between a neutral point of a star converter transformer of a unipolar and/or bipolar low-end valve group and a direct-current grounding electrode. By connecting the bias resistor in series between the neutral point of the star converter transformer of the unipolar and/or bipolar low-end valve group and the direct-current grounding electrode, the test system introduces a direct current of the grounding electrode to the neutral point of the Vn/V converter transformer to simulate a phenomenon of the direct-current bias of the converter transformer caused by the fact that the direct current invades the converter transformer in an actual direct-current power transmission system. When the system is used to simulate the direct-current bias of the converter transformer, the realization method is simple and reliable, and the realization threshold is relatively low.