杨旭红,郝鹏飞
YANG Xuhong,HAO Pengfei

• 1:上海电力大学自动化工程学院

摘要(Abstract)：

为了提高电网电压畸变条件下分布式发电系统的适应能力,实现逆变器输出电流的高质量并网,需要改进其传统控制策略。首先,建立三相LCL型并网逆变器的等效数学模型,分析电网背景谐波影响入网电流的机理。然后,提出一种基于PMCI(比例多复数积分)控制器和改进电网电压前馈的有源阻尼控制策略。通过PMCI控制器实现对基波电流的无静差跟踪和对谐波的有效补偿,引入电网电压前馈提高整个控制系统对电网电压扰动的响应速度,同时滤除部分谐波。最后,在MATLAB/Simulink中搭建逆变器的控制模型,仿真结果显示电网电压谐波畸变条件下,所提出的控制策略能够有效削弱电网背景谐波对入网电流的影响,证明了该控制策略的可行性与有效性。
To improve the adaptability of the distributed generation system under grid voltage distortion and achieve a high-quality grid connection of the inverter output current, it is essential to improve its traditional control strategy. First, an equivalent mathematical model of the three-phase LCL grid-connected inverter was established, and the mechanism of background harmonics in the grid affecting the grid current was analyzed.Then, an active damping control strategy based on proportional multiple complex integral(PMCI) controller and improved grid voltage feedforward was proposed. The PMCI controller realizes the tracking of the fundamental current without static errors and the effective compensation of the harmonics. The introduction of grid voltage feedforward can improve the response speed of the entire control system to grid voltage disturbances and filter out part of harmonics. Finally, a control model of the inverter was built in MATLAB/Simulink. The simulation results showed that under the grid voltage harmonic distortion, the proposed control strategy turned out to be feasible and effective by mitigating the impact of grid background harmonics on grid current.

关键词(KeyWords)： 电网电压谐波畸变;并网逆变器;比例多复数积分控制器;电网电压前馈
grid voltage harmonic distortion;grid-connected inverter;PMCI controller;grid voltage feedforward

Abstract:

Keywords:

基金项目(Foundation): 上海市电站自动化技术重点实验室开放课题（13DZ2273800）;; 上海市重点科技攻关计划（上海市科委地方院校能力建设项目）（14110500700）

作者(Author): 杨旭红,郝鹏飞
YANG Xuhong,HAO Pengfei

DOI: 10.19585/j.zjdl.202106004

参考文献(References)：

• [1]杨兴武，王涛，徐依明，等.基于虚拟电感的LCL型并网逆变器电网电压前馈控制策略[J].太阳能学报，2020,41(11):56-63.
• [2]马文杰，欧阳森，杨林.适用于三相并网逆变器的新型谐振控制方法[J].电网技术，2019,43(8):2884-2891.
• [3]LI P,WU W,HU K.A Multicell network control and design for three-phase grid-connected inverter[J].IEEE Transactions on Industrial Electronics,2021,68(4):2740-2749.
• [4]李国庆，张馨月，陈继开，等.计及谐波影响的光伏逆变器控制方法研究[J].电测与仪表，2014,51(10):70-76.
• [5]叶吉亮，李岚，刘海霞，等.电网电压不平衡及谐波状态下的并网逆变器控制策略[J].电力系统保护与控制，2018,46(6):113-119.
• [6]周培东，赵宇，李继川，等.电网谐波下PWM变换器的谐波电流抑制[J].电力系统及其自动化学报，2016,28(5):91-96.
• [7]LI W,RUAN X,PAN D,et al.Full-feedforward schemes of grid voltages for a three-phase LCL-type grid-connected inverter[J].IEEE Transactions on Industrial Electronics,2013,60(6):2237-2250.
• [8]WANG X,RUAN X,LIU S,et al.Full feed-forward of grid voltage for grid-connected inverter with LCL filter to suppress current distortion due to grid voltage harmonics[J].IEEE Transactions on Power Electronics,2010,25(12):3119-3127.
• [9]潘嘉进，刘彦呈，张勤进，等.基于电网电压全前馈的七电平光伏并网系统[J].电力系统及其自动化学报，2017,29(6):53-58.
• [10]HU J,ZHANG W,WANG H,et al.Proportional integral plus multi-frequency resonant current controller for gridconnected voltage source converter under imbalanced and distorted supply voltage conditions[J].Journal of Zhejiang University(Science A),2009,10(10):1532-1540.
• [11]韩刚，蔡旭.不平衡及畸变电网下并网变流器的比例多谐振电流控制[J].电力自动化设备，2017,37(11):104-112.
• [12]JIA Y,ZHAO J,FU X.Direct grid current control of LCLfiltered grid-connected inverter mitigating grid voltage disturbance[J].IEEE Transactions on Power Electronics,2013,29(3):1532-1541.
• [13]都成刚，黄静.非理想电网下LCL逆变器并网电流质量改善研究[J].电力电子技术，2018,52(11):99-103.
• [14]梁营玉，刘建政.谐波和不对称电网电压MMC-HVD桥臂电流控制策略[J].电网技术，2018,42(8):2494-2502.
• [15]熊平化，孙丹，邓伦杰.广义谐波电网环境电压源型并网变流器滑模变结构直接功率控制策略[J].电网技术，2016,40(6):1845-1850.
• [16]郭小强.光伏并网逆变器通用比例复数积分控制策略[J].中国电机工程学报，2015,35(13):3393-3399.
• [17]董文明.电网电压畸变下LCL型并网逆变器控制研究[D].徐州：中国矿业大学，2018.