考虑DVS的光伏系统GHS短期电压稳定性设计

Short Term Voltage Stability Design of Photovoltaic System GHS Considering DVS

为降低光伏系统与电力系统并网所引起的电网稳定性恶化问题,提出一种考虑注入电流限制动态电压支撑能力(Dynamic Voltage Support capability, DVS)的光伏系统高斯和声搜索(Gaussian Harmony Search, GHS)短期电压稳定性设计方法。首先,将光伏系统表示成逆变器、故障穿越(Fault Ride-through, FRT)和DVS的能力模型,与传统的DVS性能相比,该方法采用有功和无功注入,提高了系统的短期电压稳定性;其次,引入和声搜索算法对模型参数进行优化,同时为了提高该算法的优化性能,利用高斯遍历性进行算法性能的改进;最后,通过在光伏电力系统仿真实例上的实验研究,显示所提方法可有效缓解光伏系统中断引起的故障后的频率下降问题,提升光伏系统的短期电压稳定性。

In order to reduce the deterioration of power grid caused by grid connection between photovoltaic system and power system, a novel method for designing short term voltage stability of photovoltaic systems, called Gauss harmonic search(GHS), considering the injection current limitation and the dynamic voltage support capability(DVS) is proposed. Firstly, the photovoltaic system is represented as inverter, fault ride-through(FRT) model and DVS, compared with the traditional method of DVS performance, use active power and reactive power injection to improve the short-term voltage stability of the system;Secondly, the harmony search algorithm is introduced to optimize the model parameters. At the same time, in order to improve the optimization performance of the algorithm, the Gauss ergodicity is used to improve the performance of the algorithm;Finally, the simulation results of the photovoltaic power generation system show that the method is feasible,effectively alleviates the interruption caused by the frequency drop after the failure of the photovoltaic system,and improve short-term voltage stability of photovoltaic system.