摘要
建立在弱电网下的多逆变器并联系统的数学模型,利用模态分析法分析了不同参数逆变器并联系统的谐振特性,在此基础上提出了一种通过并联虚拟导纳重塑逆变器输出导纳,同时在电压前馈通道引入自校正滤波器的复合控制策略。通过仿真实验表明,该方法可以有效降低多逆变器并联系统的谐振失稳风险,同时可以显著提高逆变器对弱电网的适应能力,增强系统稳定性。
The mathematical model of multiinverter parallel system under weak current network is established,and the resonant characteristics of inverter parallel system with different parameters are analyzed by modal analysis method.On this basis,a composite control strategy is proposed,which reshapes the output admittance of inverter through parallel virtual admittance and introduces selftuning filter in voltage feedforward channel.The simulation results show that this method can effectively reduce the resonance instability risk of multiinverter parallel system,significantly improve the adaptability of inverter to weak power grid and enhance the system stability.
作者
曹芸凯
赵涛
陈静
徐友
CAO Yunkai;ZHAO Tao;CHEN Jing;XU You(Nanjing Institute of Technology,Nanjing 211167,China)
出处
《机械与电子》
2022年第6期14-21,共8页
Machinery & Electronics
基金
江苏省研究生科研与实践创新项目(SJCX21_0943)
南京工程学院大学生科技创新项目(TB202117049)。
关键词
弱电网
谐振
并联逆变器
稳定性
weak grid
resonance
paralleled inverters
stability
