摘要
针对不平衡电网下常规光伏逆变器的并网电流三相不对称及谐波含量大增的问题,研究了相应的控制策略。首先,从获取电压相位出发,设计了基于二阶广义积分器(Second Order Generalized Integrator,SOGI)的不平衡锁相环,以快速、准确地锁定电网正序分量的幅值和相位,并通过实验加以验证;其次,将抑制网侧负序电流作为控制目标,设计了基于电网负序电压前馈的不平衡电网下光伏逆变器的控制策略,且为减弱直流侧电压波动对并网电流的影响,在电压外环控制器后引入了二倍频陷波器。最后,利用PSCAD/EMTDC搭建出光伏并网系统仿真模型,仿真结果表明了本文理论研究的正确性。
To enhance the operation performance of the PV inverter under unbalanced grid voltage, this paper proposes a control strategy, which is based on negative sequence voltage feed forward, to make the output current of the inverter balanced and sinu-soidal. To separate the positive and negative sequence voltage quickly and accurately, the paper proposes a scheme based on the second order generalized integrator（ SOGI）. The experimental results validate the effectiveness of the proposed method. Finally, the control strategy, which is validated effectively, is simulated and analyzed by PSCAD simulation software.
作者
欧阳森
马文杰
Ouyang Sen1,2,Ma Wenjie1,2(1.School of Electric Power,South China University of Technology,Guangzhou 510640,China; 2.Key Laboratory of Clean Energy Technology of Guangdong Province, Guangzhou 510640, Chin)
出处
《电子技术应用》
2018年第5期147-150,共4页
Application of Electronic Technique
基金
广东省自然科学基金(2016A030313476)
