高压直流转换开关辅助回路振荡特性参数的检测与分析

Analysis and Detection of Auxiliary Circuit Oscillation Characteristic Parameters of High Voltage DC Transfer Switch

为实现高压直流转换开关的可靠操作,在高压直流转换开关类型、结构原理及转换过程数学模型研究的基础上,研究开发了1套高压直流转换开关辅助回路振荡特性参数的现场测试系统。结合±800kV雁门关换流站系统通过分析高压直流转换开关类型及结构原理,给出辅助回路振荡特性参数测试的试验原理及测试方法,完成直流场4种直流转换开关辅助回路电容和电流衰减特性的测试,并计算给出辅助回路衰减周期、振荡频率、回路电感、回路电阻等参数值。结果表明4种直流转换开关辅助回路的振荡特性参数满足高压直流输电系统的要求,同时也证明了该测试方法及试验系统的有效性及正确性,为下一步直流转换开关辅助回路振荡特性参数现场试验应用提供依据。

In order to achieve reliable operation of high voltage DC transfer switch, a set of field test system for the oscillation characteristic parameters of the auxiliary circuit of the high-voltage DC transfer switch was developed based on the research of the switch types, structural principle and mathematical model of the transfer process. Combined with the parameter requirement of the transfer switch of ± 800 kV Yanmenguan converter station, the test principle and test method of the auxiliary circuit oscillation characteristic parameters are given by analyzing the type and structure principle of the high-voltage DC transfer switch. The test of the capacitance and current attenuation characteristics of auxiliary circuit of four types of DC transfer switch are carried out, and the parameters such as the auxiliary circuit attenuation period, oscillation frequency, circuit inductance, and circuit resistance are calculated and identified.The results show that the oscillation characteristic parameters of the four types of DC switching auxiliary circuits meet the requirements of HVDC transmission system, and the validity and correctness of the test method and test system are also proved. It provides a basis for the field test application of the auxiliary circuit oscillation characteristic parameters of the DC transfer switch.