三电平STATCOM变压器主接线方式的研究

STUDY ON THE TRANSFORMER CONNECTION MODES OF THREE-LEVEL STATCOM FOR ELIMINATING HARMONICS

根据对三电平STATCOM输出谐波分量消除的要求，对其变压器主接线方式进行了研究，提出了各种可行的接线方式并进行了详细的理论分析和仿真。仿真结果表明，采用这几种接线方式，STATCOM输出的线电压中均不含6（2k－1）±1次（k＝1，2，3，…）谐波，存在的最低次谐波为35次，达到了较为理想的谐波消除效果。

Several different transformer connection modes for eliminating harmonics in the output voltage of 3-level STATCOM are discussed in detail. Both theoretical analysis and digital simulation show that with these connection modes. in the output line voltage of the STATCOM, there exist no harmonics of the orders of 6(2k - 1 )±1 (k = 1,2,3, …). This means that the installation of the STATCOM has negligible harmonic influence on the power systems. The lowest order of remaining harmonics in the output line voltage is 35th. Therefore. these connection modes of transformers meet the requirement of harmonic elimination.