基于无谐波检测的LCL-APF直接功率控制  

An LCL-APF Direct Power Control Approach Based on Non-Harmonic Detection Technology

作　　者：李志勇[1] 沈玲菲[1] 徐保友[1] 危韧勇[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南省长沙市410083

出　　处：《电网技术》2012年第12期217-221,共5页Power System Technology

摘　　要：LCL型有源电力滤波器具有补偿带宽高和开关纹波含量低的优点,但由于LCL输出滤波器是3阶系统,在谐振频率处会产生谐振,使稳定控制比较困难。文章提出了一种基于无谐波检测技术的LCL型有源电力滤波器直接功率控制方法,将无谐波检测技术结合到LCL型有源电力滤波器直接功率控制中,该方法省去了复杂的负载谐波电流检测和补偿电流检测,具有良好的有源电力滤波器谐波补偿效果,同时采用直接功率控制提高了系统动态控制性能,此外为克服LCL滤波器谐振问题,在控制器中增加了有源功率阻尼环节。仿真试验结果证明了该方法的正确性和可行性。The active power filter with LCL filter （LCL-APF） possesses the advantages of wide bandwidth of compensation and low content of switching ripples, however the LCL filter is a three-order system so it may cause resonance at the resonance frequency point and makes the stability control more difficult. Integrating with non-harmonic detection technology, an LCL-APF direct power control method is proposed. In the proposed method the complex load harmonic current detection and the dete^tion of compensation current are left out and satisfied compensation effect is achieved, meanwhile the dynamic control performance of LCL-APF is improved by direct power control. Besides, to overcome the resonance caused by LCL filter, the active power damping of LCL filter is added in the controller. Simulation results show that the proposed method is correct and feasible.

关 键 词：LCL型有源电力滤波器 无谐波检测技术 直接 功率控制 有源功率阻尼 

分 类 号：TM761[电气工程—电力系统及自动化]