CAJ | 학술논문

有源滤波器（APF）和静止同步补偿器（STATCOM）在电力系统应用中都是独立开来，分别进行谐波抑制和无功补偿。将APF和STATCOM功能结合起来，以级联H桥换流器构成APF-STATCOM装置，同时实现无功补偿和谐波抑制。在分析级联H桥APF-STATCOM拓扑及其工作原理的基础上，提出了一种简单有效的控制策略；针对级联H桥换流器各子模块间的电容电压均衡问题，采用最近电平逼近调制（NLM）并提出了一种适用于级联H桥换流器的电容电压均衡控制策略。利用PSCAD/EMTDC对36级联H桥APF-STATCOM进行了建模仿真，结果验证了该控制策略和电容电压均衡控制策略的可行性和有效性，并表明所提出的电容电压均衡策略能有效避免H桥模块IGBT不必要的频繁开关，减少器件的开关频率。
유원려파기（APF）화정지동보보상기（STATCOM）재전력계통응용중도시독립개래，분별진행해파억제화무공보상。장APF화STATCOM공능결합기래，이급련H교환류기구성APF-STATCOM장치，동시실현무공보상화해파억제。재분석급련H교APF-STATCOM탁복급기공작원리적기출상，제출료일충간단유효적공제책략；침대급련H교환류기각자모괴간적전용전압균형문제，채용최근전평핍근조제（NLM）병제출료일충괄용우급련H교환류기적전용전압균형공제책략。이용PSCAD/EMTDC대36급련H교APF-STATCOM진행료건모방진，결과험증료해공제책략화전용전압균형공제책략적가행성화유효성，병표명소제출적전용전압균형책략능유효피면H교모괴IGBT불필요적빈번개관，감소기건적개관빈솔。
Active power filter (APF) and static synchronous compensator (STATCOM) are indispensable elements in power system. APF can be used to suppress the harmonics, while STATCOM can be used to compensate reactive power. In this paper, the functions of APF and STATCOM are combined in a single unit by controlling a three-phase cascaded H-bridge converter, i.e. APF-STATCOM. This paper introduces topology and working principle of cascaded H-bridge APF-STATCOM and puts forward a control strategy. In order to balance DC capacitor voltages of cascaded H-bridge converter, balancing control strategy for cascaded H bridge converters based on nearest voltage level modulation (NLM) is proposed. 36 cascaded H-bridge APF-STATCOM model is set up in PSCAD/EMTDC. And by the simulation, the feasibility and effectiveness of control strategy and balance control strategy are verified. The proposed capacitor voltage balancing strategy can avoid unnecessary frequent switch of H bridge module IGBT.