CAJ | 학술논문

通过对统一电能质量调节器(UPQC)电路拓扑的稳态功率进行详细分析,并与基于传统控制策略下UPOC所需容量进行一系列比较,提出一种基于串联侧无有功注入的新型控制策略.该控制策略根据相应的负载功率因数角、电压跌落程度决定串联侧补偿电压的幅值,在特定补偿电压注入角情况下,使得串联侧不消耗任何有功,同时能够减小并联侧无功补偿容量.该控制策略不仅能完成电网电压跌落补偿、谐波治理、负载无功补偿和输入功率因数校正,且在串联侧不消耗任何有功的情况下降低整个UPQC的补偿容量.为了克服滞环控制的不足,串联侧采用恒频滞环来保持开关频率的稳定.仿真结果验证了理论分析的正确性与可行性.
통과대통일전능질량조절기(UPQC)전로탁복적은태공솔진행상세분석,병여기우전통공제책략하UPOC소수용량진행일계렬비교,제출일충기우천련측무유공주입적신형공제책략.해공제책략근거상응적부재공솔인수각、전압질락정도결정천련측보상전압적폭치,재특정보상전압주입각정황하,사득천련측불소모임하유공,동시능구감소병련측무공보상용량.해공제책략불부능완성전망전압질락보상、해파치리、부재무공보상화수입공솔인수교정,차재천련측불소모임하유공적정황하강저정개UPQC적보상용량.위료극복체배공제적불족,천련측채용항빈체배래보지개관빈솔적은정.방진결과험증료이론분석적정학성여가행성.
The steady-state power of UPQC (Unified Power Quality Controller) circuit topology is analyzed and a control scheme without active power injection at the serial side is presented based on the comparison of its required capacity with traditional control scheme. It decides the amplitude of serial side compensation voltage by the load power factor angle and the voltage drop,and,with a particular compensation voltage injection angle,makes the active power consumption at serial side zero and the reactive power compensation capacity at parallel side reduced. It not only compensates voltage sag, suppresses harmonics,compensates load reactive power and corrects input power factor,but also reduces the total compensation capacity of UPQC without active power consumption at the serial side. The constant frequency hysteresis is adopted to keep switching frequency stable and improve the hysteretie control. The accuracy and reliability of the theoretical analysis are verified by simulative results.