基于双环路反馈的三相逆变器有源阻尼并网控制策略研究  

Research on active damped grid-connected control strategy of three-phase inverter based on double-loop feedback

作　　者：李劲松 亓玉帅[1,2] 李国锋 吕敬[3] 华浩[3] 杨庆新 李永建[4] LI Jingsong;QI Yushuai;LI Guofeng;L Jing;HUA Hao;YANG Qingxin;LI Yongjian(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China;Dalian New Power System Engineering Research Center,Dalian University of Technology,Dalian 116024,China;Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]大连理工大学电气工程学院,辽宁大连116024 [2]大连理工大学大连市新型电力系统工程研究中心,辽宁大连116024 [3]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240 [4]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130

出　　处：《电机与控制学报》2025年第1期156-169,184,共15页Electric Machines and Control

基　　金：电力传输与功率变换控制教育部重点实验室(上海交通大学)开放课题(2023AA02);省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学)开放基金重点项目(EERI_KF2022002);江苏省配电网智能技术与装备协同创新中心开放基金(XTCX202305);四川省氢能源与多能互补微电网工程技术研究中心开放基金(2024DWNY005);新能源装备检测福建省高校重点实验室(莆田学院)开放课题项目(XNY202403);中国博士后科学基金(2022M711318)。

摘　　要：作为新能源发电单元与电网之间的能量交换接口,并网逆变器用来将直流电能转换为高质量的交流电能并馈入电网,是新型电力系统的重要组成部分。LCL滤波器由于其出色的高频谐波抑制能力而广泛应用于并网逆变器输出端,但因其开环传递函数缺乏阻尼项而存在谐振尖峰,造成系统运行不稳定。鉴于此,提出利用逆变器侧电流进行有源阻尼控制,相比传统电容电流有源阻尼控制策略,在面对电网阻抗变化时,基频增益T fo与截至频率f c仍能保持不变。且从阻尼角度分析,具有更好的稳定裕度和响应速度。为进一步降低电网电压对并网电流的影响,同时引入电网电流反馈,构建双环路以增大输出阻抗。以逆变器电流环消除谐振尖峰,以电网电流环降低谐波分量,最后仿真验证所提控制策略的有效性与可行性。As an energy exchange interface between the new energy generation unit and the grid,grid-connected inverters were used to convert DC energy into high-quality AC energy and feed it into the grid,which is an important part of the new power system.LCL filter is widely used in the output of the grid-connected inverter because of its excellent ability to suppress high-frequency harmonics.However,due to the lack of damping term in the open-loop transfer function,there is a resonance peak,resulting in unstable operation of the system.In view of these problems,the active damping control using inverter side current was proposed.Compared with the traditional capacitive current active damping control strategy,the fundamental frequency gain T fo and the cut-off frequency f c can remain unchanged in the face of the impedance change of the grid.And analysis from the perspective of damping,it has better stability margin and response speed.In order to further reduce the influence of grid voltage on grid-connected current,the grid current proportional feedback was introduced at the same time,to construct a double-loop to increase the output impedance.The inverter current loop was used to eliminate the resonance peak,and the grid current loop was used to reduce the harmonic component.Finally,simulation was performed to verify effectiveness and feasibility of the proposed control strategy.

关 键 词：LCL并网逆变器 逆变器侧电流 有源阻尼控制 双环路反馈 输出阻抗 谐波抑制 

分 类 号：TM46[电气工程—电器] TK513.5[动力工程及工程热物理—热能工程]