Quasi-Selective Harmonic Elimination (Q-SHE) Modulation-Based DC Current Balancing Method for Parallel Current Source Converters
Quasi-Selective Harmonic Elimination (Q-SHE) Modulation-Based DC Current Balancing Method for Parallel Current Source Converters
复制标题
用于并联电流源转换器的基于准选择性谐波消除 (Q-SHE) 调制的直流电流平衡方法
DOI:
10.1109/tpel.2018.2882463
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发表时间:
2019-08
影响因子:
6.7
通讯作者:
Chengshan Wang
中科院分区:
文献类型:
--
作者:
Jinwei He;Qiang Li;Changhao Zhang;Junfei Han;Chengshan Wang
Parallel operation of current source converters (CSCs) is an attractive approach for medium-voltage high-power conversion applications. In order to achieve proper dc rail current balancing of parallel CSCs while maintaining a good control of ac line current quality at low switching frequency (typically at a few hundred hertz), an improved quasi-selective harmonic elimination (Q-SHE) modulation method with online delay angle and bypass band adjustment is proposed. At first, each CSC positive rail dc current is regulated by tuning the delay angle of the corresponding line reference current with respect to the grid voltage. At the same time, the negative rail dc currents balancing errors are compensated by injecting small bypass pulses into the conventional SHE pattern. By the coordinated control of the aforementioned methods, an accurate dc rail currents balancing and an enhanced line current quality can be achieved at both the steady and the transient states.
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