非理想电网下直驱风力发电功率和电流平衡控制  

Power and current balance control of direct-driven wind power generation under non-ideal grid conditions

作　　者：庹瑾 罗冰冰 刘岑岑 李艳 杨骥勋 张纯江[3] TUO Jin;LUO Bingbing;LIU Cencen;LI Yan;YANG Jixun;ZHANG Chunjiang(Measurement Center of State Grid Hubei Electric Power Company Limited,Wuhan,Hubei 430080,China;Anxin County Power Supply Branch of State Grid Hebei Electric Power Company Limited,Anxin,Hebei 071000,China;School of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066000,China)

机构地区：[1]国网湖北省电力有限公司计量中心,湖北武汉430080 [2]国网河北省电力有限公司安新县供电分公司,河北安新071000 [3]燕山大学电气工程学院,河北秦皇岛066000

出　　处：《河北工业科技》2020年第5期343-351,共9页Hebei Journal of Industrial Science and Technology

基　　金：河北省自然科学基金(E2018203152)。

摘　　要：为了应对实际运行时电网电压不平衡情况,提出将电网电压不平衡度作为界定采取不同控制方法的依据,推导了非理想电网下直流母线电压波动机理,开展了基于解耦双同步参考坐标系(DDSRF)的正负序分解的网侧逆变器控制策略研究,提出了能够对非理想电网电压进行准确锁相的新型锁相方法,并在Matlab/Simulink中进行了仿真实验。结果表明1)当电网电压不平衡度较小(小于20%)时,采用电流平衡目标控制;当电网电压不平衡度较大(大于20%)时,采用功率平衡目标控制;2)所提出的控制策略能有效抑制直流母线电压波动,优化并网电能质量;3)二/三阶混合型广义积分器锁相环(MSTOGI-PLL)能够在非理想电网情况下提供准确相位信息,帮助网侧逆变器实现可靠并网。研究结果可为直驱风力发电系统非理想电网下的稳定运行提供参考。In order to deal with the unbalanced grid voltage conditions under actual situation,different control methods were adopted according to the degree of grid voltage imbalance,the mechanism of DC bus voltage fluctuation in non-ideal grid was deduced,and the positive and negative sequence decomposition control strategy of the grid side inverter was studied based on decoupled double synchronous reference frame(DDSRF).Then,a new phase-locked method which can accurately lock under non-ideal grid voltage was proposed and the simulation experiment was carried out in Matlab/Simulink.The results show that:1)when the grid voltage imbalance is small(less than 20%),the current balance target control is adopted;when the grid voltage imbalance is large(more than 20%),the power balance target control is adopted;2)the proposed control strategy can effectively suppress the DC bus voltage fluctuation and optimize the grid connected power quality;3)the mixed second-order and third-order generalized integrator phase locked loop(MSTOGI-PLL)can provide accurate phase information in the case of non-ideal power grid and help the grid side inverter to realize the grid-connected.The research results can provide reference for the stable operation of direct-driven wind power generation system in non-ideal grid.

关 键 词：发电工程 风力发电 永磁直驱同步发电机 电网电压不平衡 功率平衡控制 

分 类 号：TM464[电气工程—电器]