Converter transformer protection RTDS real-time digital closed loop test system for and method thereof

Abstract

The invention discloses a converter transformer protection real-time digital system (RTDS) real-time digital closed loop test system and a method thereof. The test system comprises an RTDS real-time digital simulator and a converter transformer protection device, wherein the RTDS real-time digital simulator outputs a voltage analog signal, a current analog signal and a tap joint gear digital signal in a converter transformer simulation model to the converter transformer protection device; the converter transformer protection device inputs a protection trip digital signal to the RTDS real-time digital simulator; a direct-current power transmission system simulation model, established in the RTDS real-time digital simulator, of the converter transformer is a single-phase model; and an additional inductor Xp is connected between a converter transformer and a converter valve. The test system can provide the primary side head-end three-phase current output and the secondary side head-end three-phase current output, required for a converter transformer protection real-time simulation test, of the converter transformer, and also can provide the primary side tail-end three-phase current output and the secondary side tail-end three-phase current output of the converter transformer, thereby meeting the requirements on a converter transformer protection RTDS test.

Description

technical field [0001] The invention relates to a converter transformer protection RTDS real-time digital closed-loop test system and its method, and belongs to the innovative technology of the converter transformer protection RTDS real-time digital closed-loop test system and its method. Background technique [0002] Converter transformer protection As the protection device of the converter transformer, its performance directly affects the safe and stable operation of the converter transformer and even the entire DC system. exist figure 1 In the converter transformer protection RTDS real-time digital closed-loop test system, the simulation modeling of the converter transformer and the rationality of its parameter settings directly determine the accuracy of the test system. However, in the current converter transformer modeling method, the converter transformer adopts figure 2 The three-phase model shown. In this model, the ABC three-phase integration of the converter tr...

AI Technical Summary

Problems solved by technology

In this model, the ABC three-phase integration of the converter transformer is solidified in one model, which cannot meet the requirements of the converter transformer protection test: (1) This model can only provide the first three-phase current of the primary side of the converter transformer (Iysa, Iysb , Iysc) and the three-phase current (Ifsa, Ifsb, Ifsc) output at the first end of the secondary side, and cannot output the currents at the end of the primary and secondary windings required for the real-time simulation test of converter transformer protection; (2) This model cannot simulate the commutation Transformer internal fault

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