基于换相过程线性化的电流开关函数分析偏差研究

Study On Current Switching Function's Analysis Deviation Based on Linearized Commutation Process

开关函数法在高压直流输电系统中的谐波分析与计算方面应用越来越广泛。给出了开关函数的详细推导过程,利用MATLAB对利用线性化电流开关函数求取换流器交流侧相电流引起的偏差做了详细分析。分析研究表明,当换相角不大时线性化引起的偏差很小,随着换相角的增大,该偏差随之增大。

Switching function has shown great viability in the analysis and calculation of harmonic in HVDC system. The detailed deduction process of switching function is presented in this paper. And the deviation which is induced by using the linearized current switching function to obtain the phase current of converter AC side is studied by MATLAB in detail. The analysis result shows that the deviation induced by linearization is small when overlap angle is small and increases as overlap angle increases.