电网不对称故障下光伏并网逆变器的无功支撑控制策略  

REACTIVE POWER SUPPORT CONTROL STRATEGY FOR PV GRID-CONNECTED INVERTERS UNDER ASYMMETRIC GRID FAULTS

作　　者：廖一丁 夏向阳[1] 刘俊翔 蒋戴宇 王灿 王雷 Liao Yiding;Xia Xiangyang;Liu Junxiang;Jiang Daiyu;Wang Can;Wang Lei(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Changgao Electric Group Co.,Ltd.,Changsha 410219,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114 [2]长高电新科技股份公司,长沙410219

出　　处：《太阳能学报》2024年第9期326-333,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51977014);长沙市科技计划(kh2205010);湖南省教育厅科学研究重点项目(22A0230)。

摘　　要：针对电网不对称故障下光伏系统存在的输出电流峰值越限、交流侧功率波动、直流侧电压不稳定等问题,该文提出一种电网不对称故障下光伏并网逆变器无功支撑控制策略。以无功支撑要求为目标,以有功功率波动幅值和输出电流峰值为约束条件确定逆变器的有功功率安全运行区域,提供足够无功支撑并扩展有功功率输出能力,或在约束条件内根据无功电流权重提供部分无功支撑,保证光伏系统在发生电网不对称故障时安全运行,最后仿真验证了控制策略的有效性。Aiming at the problems of output current peak exceeding limit,AC side power fluctuation and DC side voltage instability in photovoltaic system under asymmetric grid fault,this paper proposes a reactive power support control strategy for photovoltaic grid-connected inverter under asymmetric grid fault.Taking the reactive power support requirement as the goal,the active power safe operation area of the inverter is determined with the active power fluctuation amplitude and the output current peak as the constraint conditions,providing sufficient reactive power support and expanding the active power output capability,or providing partial reactive power support according to the reactive current weight within the constraint conditions to ensure the safe operation of the photovoltaic system in the event of an asymmetric grid fault.Finally,the simulation verifies the effectiveness of the control strategy.

关 键 词：光伏系统 电能质量 无功功率 故障穿越 安全运行区域 

分 类 号：TK514[动力工程及工程热物理—热能工程]