基于改进无源性控制的三相LCL并网逆变器输出导纳重塑方法  

An Admittance Reshaping Strategy of Three-Phase LCL Grid-Connected Inverter Based on Modified Passive Control

作　　者：王晗[1] 张建文[1] 施刚[1] 朱淼[1] 蔡旭[1] WANG Han;ZHANG Jianwen;SHI Gang;ZHU Miao;CAI Xu(Key Laboratory of Control of Power Transmission and Conversion of the Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]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

出　　处：《上海交通大学学报》2023年第9期1105-1113,共9页Journal of Shanghai Jiaotong University

基　　金：国家电网有限公司总部科技项目(4000-202055048A-0-0-00)。

摘　　要：基于能量函数的无源性控制(PBC)被广泛研究并用于并网变换器以获得更好的控制性能.然而,传统的PBC方法依赖并网变换器的精确数学模型,且已有研究较少考虑数字控制的延迟效应以及电容性电网或复杂弱电网下电网阻抗的不确定性对系统稳定控制的影响.鉴于此,针对三相LCL并网逆变器提出一种改进PBC方法以实现导纳重塑,通过增加电容电流前馈将系统无源区域扩展到奈奎斯特频率,在电网阻抗宽范围变化下实现LCL谐振频率的有源阻尼控制,并提出改进PBC控制参数设计方法.在3 kW并网逆变器样机平台上开展仿真和实验研究,验证了理论分析的正确性.The passivity-based control(PBC)based on energy function has been studied for grid-connected converters to achieve a better performance.However,traditional PBC method relies on the accurate mathematical model of grid-connected inverter.In previous studies on PBC,the effect of digital control delay is rarely considered and the stability under grid impedance uncertainties is not discussed,especially in the capacitive grid or complex weak grid.To address these issues,this paper proposes an improved PBC method to reshape the output admittance for LCL-filtered grid-connected inverters.The system passive region is expanded up to the Nyquist frequency by adding a capacitor current feedback loop which can achieve active damping control of LCL resonant frequency under the wide range of grid impedance changes.The parameter design method is also presented for the proposed PBC control.To verify the correctness of the theoretical analysis,both simulation and experiments are conducted on a 3 kW grid-connected inverter prototype.

关 键 词：LCL滤波器 并网逆变器 无源控制 有源阻尼 稳定性 

分 类 号：TM461.5[电气工程—电器]