【摘要】 串联型电能质量控制器(SPQC)通过向系统电压中串联一个电压源来调节用户侧电压质量。当系统电压发生电压跌落、浪涌、不平衡现象或电压中含有谐波时,使用SPQC可以获得更高的效率。文中对系统电压不平衡条件下SPQC注入电压的特性进行了研究,提出了优化控制的几个目标,在此基础上对三相三线制和三相四线制非平衡电压跌落的补偿进行了研究,并以三相四线制系统为例,提出了优化补偿电压的算法。仿真结果很好地证明了理论分析的正确性。更多还原

【Abstract】 Series power quality controller (SPQC) can mitigate the voltage disturbances by superposing a voltage on the system voltage. It can be regarded as a series-connected voltage source of the system. It has great effect in condition of voltage sags, surges, imbalances and harmonics. This paper analyzed the characteristic of injecting voltage of the SPQC when the system voltages are unbalanced, proposed some new objects of optimum control strategies for it. On the basis of that, this paper studied the compensation of unbalanced voltage sags in 3-phase 3-wire system and 3-phase 4-wire system. A new algorithm in order to optimize compensating voltage is presented and has been discussed details in case of 3-phase 4-wire system voltage imbalance sags. Simulations are shown to validate the control methods.更多还原