基于改进型SOGI的单相LCL型并网逆变器的功率解耦控制  

A Power Decoupling Control Strategy of Single-phase LCL Gridconnected Inverters Based on Improved SOGI

作　　者：吴慧芳[1] 丁欣[2] 覃柳文 WU Huifang;DING Xin;QIN Liuwen(Guangxi Electrical Polytechnic Institute,Guangxi Nanning 530007,China;Guangxi Water Resources and Electrical Power Vocational and Technical College,Guangxi Nanning 530023,China;School of Electrical Engineering,Guangxi University,Guangxi Nanning 530004,China)

机构地区：[1]广西电力职业技术学院,广西南宁530007 [2]广西水利电力职业技术学院,广西南宁530023 [3]广西大学电气工程学院,广西南宁530004

出　　处：《广西电力》2021年第5期45-52,共8页Guangxi Electric Power

基　　金：2021年度广西高校中青年教师科研基础能力提升项目(2021KY1316),2021年度广西高校中青年教师科研基础能力提升项目(2021KY091)。

摘　　要：在d-q坐标系中,LCL型并网逆变器有功控制与无功控制是耦合的,为此本文中基于d-q坐标系提出了一种功率解耦控制策略。首先,在传统二阶广义积分器(Second Order Generalized Integrator,SOGI)的基础上增加了直流分量抑制通路,抑制输入信号的直流分量,随后,在改进SOGI的基础上引入d-q坐标变换,通过坐标变换实现有功功率与无功功率的解耦控制。此外,还针对LCL滤波器存在的谐振,采用电容电流反馈实现有源阻尼,同时还加入电网电压前馈控制,消除电网电压扰动的影响,最后通过仿真与实验,验证所提出的控制策略的可行性。In the d-q coordinate system,the active power control and the reactive power control of LCL grid-connected inverters are coupled.In this paper,a power decoupling control strategy is proposed based on the d-q coordinate system.Firstly,a DC component suppression channel is added to suppress the DC component of the input signal based on the traditional Second Order Generalized Integrator(SOGI).Then the d-q coordinate transformation is introduced to realize the decoupling control of active power and reactive power through coordinate transformation based on the improved SOGI.In addition,active damping is achieved via capacitive current feedback so as to handle the resonance of the LCL filter,while the feedforward control of grid voltage is added to eliminate the influence of grid voltage disturbance.Finally,the feasibility of the proposed control strategy is verified by simulation and experiment.

关 键 词：并网逆变器 LCL滤波器 功率解耦控制 坐标变换 有源阻尼 

分 类 号：TM464[电气工程—电器]