王东杰,熊连松,梁昊,林健.可改善并网逆变器系统稳定性的弱电网频率快速检测方法[J].电测与仪表,2018,55(18):97-101. WANG Dong-jie,XIONG Lian-song,Liang Hao,Lin Jian.A Frequency Detection Method of Weak Grid for Improving Stability of Grid-tied Inverter System[J].Electrical Measurement & Instrumentation,2018,55(18):97-101.
可改善并网逆变器系统稳定性的弱电网频率快速检测方法
A Frequency Detection Method of Weak Grid for Improving Stability of Grid-tied Inverter System
Higher requirements have been put forward on accuracy and real-time of frequency detection, because renewable energy access to the grid in large-scale. The existing frequency detection method must rely on the phase-locked loop (PLL), considering the problem of PLL in the background of power electronic, a new frequency detection method is proposed in this paper based on synchronous phase open-loop detection of power grid. In this method, the difference-frequency phase is extracted from the phase information obtained by the open-loop phase detection and difference-frequency is obtained by adjusting difference-frequency phase. The experimental results show that the proposed method can effectively detect the real-time frequency of the power grid, which has high precision and strong anti-interference ability.
