低电压穿越期间风电变流器锁相环改进  

A NOVEL PHASE-LOCKED LOOP FOR WIND POWER SYSTEM UNDER LVRT CONDITION

作　　者：李泉峰[1] 陈明亮[2] 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《太阳能学报》2016年第11期2800-2806,共7页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2012CB215103;2013CB035601);国家高技术研究发展(863)计划(2013AA050404)

摘　　要：该文研究在低电压穿期间如何提高锁相环的性能。针对电压跌落和恢复过程中,电网电压幅值和相位发生变化的情况,为了准确快速地解析电压的频率、相位、幅值等信息,提出一种适用于低电压穿越期间的三相软件锁相环策略。该锁相环包括锁相环与相位调节两个部分,同时采用变结构的方式,一方面可快速追踪相位跳变,另一方面可有效减少相位突变时锁相环输出频率的波动,仿真与实验均验证了该方法的有效性。Performance of the phase-locked loop under LVRT condition was studied. During the process of voltage drops occur and recovery, as the voltage amplitude change, the voltage phase angle will also be change. In order to enhance the reliable operation of equipment, grid frequency, phase angle and amplitude tracking must be fast dynamic respond performance and high detection accuracy under LVRT condition. This paper proposes a new three-phase software phase- locked loop （PLL） that consists of a variable structure frequency detector and an initial phase angle detector, and responds fast to phase angle jumps with precise output frequency. Simulations and experiments verify the performances of the novel PLL.

关 键 词：低电压穿越 相位跳变 网侧锁相技术 变结构 

分 类 号：TM711[电气工程—电力系统及自动化] TM76