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中文摘要：
分析了多机并网逆变器系统,得出其等效电路,推导出调节逆变器输出电压的相位可以调节逆变器输出有功功率,调节逆变器的输出电压幅值可以调节逆变器输出的无功功率。根据该理论,提出了一种多机并网逆变器的并网/并联统一控制策略,通过有功功率闭环调节逆变器输出电压的频率,通过无功功率闭环调节逆变器的幅值,给出了系统的运行流程,并分析了该方法内在的反孤岛能力。仿真和实验证明,所提控制策略在逆变器并网与并联时控制效果优良,并能实现平稳转换。
英文摘要：
The multiple grid-connected inverter system is analyzed and its equivalent circuit is obtained.It is deduced that,the output active power and output reactive power of grid-connected inverter can be regulated by adjusting the phase and amplitude of its output voltage respectively,based on which,a unified control strategy is proposed for its grid-connected and parallel operating modes,which applies the active power loop and reactive power loop to respectively regulate the frequency and amplitude of inverter output voltage.The system operating procedure is given and its inherent anti-islanding ability is analyzed.The simulative and experimental results show that the inverter system with the proposed unified control strategy has better control effectiveness in either grid-connected or parallel operating mode,which allows the smooth transition between two operating modes.
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