中国电机工程学报2017，Vol.37Issue(8)：2339-2350,12.DOI:10.13334/j.0258-8013.pcsee.160881
功率–电压控制型并网逆变器及其弱电网适应性研究
A Power-voltage Controlled Grid-connected Inverter and Its Adaptability Research Under Weak Grid Conditions
摘要
Abstract
Conventional power-current controlled grid-tied inverters suffer from interactive stability issues including harmonic oscillations when integrated into weak ac grids. To overcome this limitation, a power-voltage control strategy based on the capacitor voltage feedback control of LCL filter was proposed in this paper. A detailed dynamic model for the inverter output impedance, including main circuit model, phase locked loop dynamics and regulator parameters, was developed in rotatingdq frame. The relationship between the grid stiffness and the stability margin of the proposed power-voltage control strategy was compared with that of the power-current control strategy based on the generalized Nyquist criterion. Through impedance analysis, the power-voltage controlled inverter can operate stably under weak grid conditions. In addition, the stability margin remains unchanged with the increase of the phase locked loop bandwidth, which is more adaptive under weak grid conditions. The simulation and experimental results were provided to show the effectiveness of theoretical analysis and the feasibility of the power-voltage control strategy.关键词
三相并网逆变器/弱电网/阻抗建模/功率–电流控制/功率–电压控制Key words
three-phase grid-tied inverter/weak grid/impedance model/power-current control/power-voltage control分类
信息技术与安全科学引用本文复制引用
桑顺,高宁,蔡旭,李睿..功率–电压控制型并网逆变器及其弱电网适应性研究[J].中国电机工程学报,2017,37(8):2339-2350,12.基金项目
国家自然科学基金项目(51641703) （51641703）
台达环境与教育基金会《电力电子科教发展计划》(DREM2016005). Project Supported by National Natural Science Foundation of China (51641703) （DREM2016005）
Grants from the Power Electronics Science and Education Development Program of Delta Environmental & Educational Foundation (DREM2016005). （DREM2016005）
