基于功率检测的光伏并网发电系统混合型孤岛检测方法

Hybrid Islanding Detection Method for Photovoltaic Grid-Connected Power Generation System Based on Power Detection

为保证光伏并网发电系统安全稳定运行,快速高效地检测出孤岛状态的同时尽可能地减少对电网的不良影响,提出了一种无功电流扰动法和过/欠压、过/欠频法相结合的混合型孤岛检测方法。通过实时检测相关参数并计算出逆变器侧输出功率以及负载消耗功率,再根据被动法盲区分析判断是否采用无功电流扰动方法。实现快速高效无盲区检测,同时具有无谐波污染以及对逆变器输出功率因数影响极小的优点。最后通过MATLAB/Simulink仿真试验验证了有效性。

To ensure the security and stable operation of the grid-connected photovoltaic system and efficiently detect the island state while minimizing the adverse effects on the grid,this paper proposed a reactive current disturbance method and O/UVP,O/UFP mixed islanding detection method. This method detects the relevant parameters in real time and calculates the power output from inverter and the power consumed by the load,and then determines whether to use the reactive current disturbance method according to the non-detection zone judgment of passive method. The hybrid islanding detection method realizes fast and efficient detection without non-detection zone,and has no harmonic pollution and minor impact of power factor. The simulation results in MATLAB verify the effectiveness of the method.