CAJ | 학술논문

随着模块化多电平变流器(MMC)在高压大功率电能变换领域的应用日渐增多，其故障带来的损失将显著增加。为了解决上述问题，文中提出了一种针对三相三线制系统的 MMC 容错控制策略。利用电容电压冗余排序方法克服普通载波层叠脉宽调制方法所固有的功率不均衡；在详细阐述不同容错控制方案的基础上，提出零序电压注入方法，以保证线电压恒定为基本思路，对超出临界电压区间的调制波进行重构，使 MMC 具有可靠的故障穿越能力。最后，以一台4.5 kVA 的三相MMC样机为例进行了实验验证，实验结果验证了所述方案的正确性和可行性。
수착모괴화다전평변류기(MMC)재고압대공솔전능변환영역적응용일점증다，기고장대래적손실장현저증가。위료해결상술문제，문중제출료일충침대삼상삼선제계통적 MMC 용착공제책략。이용전용전압용여배서방법극복보통재파층첩맥관조제방법소고유적공솔불균형；재상세천술불동용착공제방안적기출상，제출령서전압주입방법，이보증선전압항정위기본사로，대초출림계전압구간적조제파진행중구，사 MMC 구유가고적고장천월능력。최후，이일태4.5 kVA 적삼상MMC양궤위례진행료실험험증，실험결과험증료소술방안적정학성화가행성。
As mounting numbers of modular multilevel converters (MMCs) are increasingly applied in the field of high-voltage large-power energy conversion,the loss brought about by MMC failures will be significantly increased.To resolve this problem,a fault-tolerant control strategy for MMC in three-phase three-wire system configuration is proposed.The capacitor voltage redundant sorting method is adopted to overcome the inherent unbalanced power distribution of the phase disposition PWM.The zero-sequence voltage inj ection method is presented on the basis of elaboration of different fault-tolerant control schemes,to ensure the line voltage will remain constant.Then the modulation signals are reconfigured for the case in excess of the threshold voltage range,which enables the MMC system to possess a reliable fault ride-through capability.Finally,a three-phase 4.5 kVA MMC prototype is built for experimental validation.The experimental results have verified the correctness and feasibility of the scheme proposed.