多机电力系统中光伏发电厂附加稳定器的设计

在未来电力系统中,光伏发电厂将是一种重要的可再生电源.光伏发电厂接入未来电力系统将会影响输电系统稳定运行和控制.提出一种多机电力系统中光伏发电厂稳定器的设计新方法.首先搭建接入电网的光伏发电厂局部线性化模型.给出在光伏发电厂接入地点附近线路上发生低频功率振荡与附加稳定器控制的关系.在此局部线性化模型基础上,演示如何使用...

Design of astabilizer attached to a grid-connected PV power plant in a multi-machine power system

Photovoltaic(PV) generation will be one of the main renewable power sources in future power systems.Grid connection of PV generation can facilitate efficient and large-scale applications,which can affect significantly the operation and control of power transmission in future.This paper presents a novel method to design a stabilizer attached to a grid-connected PV power plant in a multi-machine power system.Firstly in the paper,a localized model of the grid-connected PV power plant is derived.The model gives the relationship between power oscillations along the transmission lines where the PV power plant is connected and the stabilizing control of the stabilizer.Based on the localized model,it is demonstrated that the conventional phase compensation method can be applied to design the stabilizer to provide positive damping to the line power oscillations.Hence the proposed application of the phase compensation method to design the stabilizer is both simple and localized,as it does not need to obtain and validate the information and parameters of the entire multi-machine power system.In the paper,an example four-machine power system integrated with a PV power plant is presented.The example demonstrates the effectiveness of the stabilizer designed by the proposed method based on the localized model,which is confirmed by the modal computation and non-linear simulation.Therefore,the work presented in the paper demonstrates the potential of supplementary control added on the grid-connected PV power plant,which will help the improvement of stability of future power systems where large-scale applications of PV technology are foreseen.