一种高性能并网逆变器的控制策略研究  

RESEARCH ON A CONTROL STRATEGY OF HIGH-PERFORMANCE GRID-CONNECTED INVERTERS

作　　者：张涛[1,2] 苏建徽[1,2] 杨向真[1,2] Zhang Tao;Su Jianhui;Yang Xiangzhen(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Research Center for Photovoltaic System Engineering of Ministry of Education,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]光伏系统教育部工程研究中心,合肥230009

出　　处：《太阳能学报》2025年第1期449-459,共11页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2021YFB2601402)。

摘　　要：针对传统并网逆变器控制系统存在静差和富含背景谐波的非理想电网电压下网侧电流质量不高等问题,提出一种高性能并网逆变器的控制策略。首先采用反Park变换(IPT)方法构造网侧电流正交分量,然后在dq旋转坐标系下建立网侧电流控制环路,再选用PI控制器实现电流无差跟踪。为了解决并网电流的谐波问题,引入多谐振控制器,抑制并网电流的低次谐波。在静止坐标系下推导并网逆变器控制系统的数学模型,提出控制系统中PI控制器和多谐振控制器参数的简化设计方法,分析所提控制系统的鲁棒性;最后,针对6 kW单相LCL型并网逆变器控制系统,通过仿真和实验验证所提控制策略的正确性和有效性。Some problems such as a steady state error in the control system,low quality current in grid side under non ideal grid voltage with background harmonics.In order to solve those problems,a control strategy of high-performance grid-connected inverter is pointed out in this paper.Firstly,the inverse Park Transformation(IPT)method is used to construct the orthogonal component of the grid-side current,and then the grid-side current control loop is established under the dq rotating coordinate system,and then a PI controller is used to achieve seamless tracking of the current.In order to solve the harmonic problem of grid current,a multi-resonance controller is introduced to suppress the low-order harmonics of grid-connected current.The mathematical model of the grid-connected inverter control system is derived under the stationary coordinate system,and a simplified design method for the parameters of the PI controller and multi-resonance controller in the control system is proposed.The robustness of the proposed control system is analyzed.Finally,for the 6 kW single-phase LCL grid-connected inverter control system,the correctness and effectiveness of the proposed control strategy are verified through simulation and experiments.

关 键 词：并网逆变器 正交分量构造 多谐振控制器 参数设计 电容电流反馈 

分 类 号：TM461[电气工程—电器]