基于调制迭代谐波分析法的交直流混联输电系统多谐波源研究

提出了一种交直流混合输电系统多谐波源的分析方法,即调制迭代谐波分析法(modulation and iterative harmonic analysis,MIHA)。该方法将调制理论和迭代谐波分析法相结合,既合理模拟换流站的非线性行为,解决了交直流系统的接口问题,又通过迭代使谐波计算更准确。为验证调制迭代谐波分析法的正确性和有效性,以某个典型的交直流并联输电系统为例,采用该方法对其稳态运行状况编制了程序,并对交流网络、直流网络和换流器各处的谐波电压、电流进行了计算。同时,采用电力电子详细器件模型对其进行了时域仿真校核,证明了MIHA法的正确性和有效性。

Study on Multi-Harmonic Sources in AC/DC Hybrid Transmission System Based on Modulation and Iterative Harmonic Analysis Method

To analyze multi-harmonic sources in AC/DC hybrid transmission system, modulation and iterative harmonic analysis (MIHA) method is researched. In this method the modulation theory is integrated with iterative harmonic analysis, so not only the nonlinear behavior of converter station is rationally simulated and the interface between AC system and DC system is resolved, but also the calculation of harmonics can be more accurate by means of iteration. To verify the correctness and effectiveness of MIHA, a certain typical AC/DC parallel transmission system is taken for example. The calculation program for its steady state operation condition is programmed and the harmonic voltages and currents in AC network, DC network and converter stations are calculated by MIHA. At the same time, by use of detailed models of power electronic devices the obtained calculation results are checked by time domain simulation and it is proved that MIHA is valid and practical.