摘要
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,演示如何使用经典的相位补偿法设计附加稳定器,向线路低频功率振荡提供正阻尼.该方法无需获得和验证全多机电力系统的运行和参数信息,就能进行稳定器的设计,是一种简单、局部化的设计方法.实例分析验证了该方法的有效性,即通过在光伏发电厂上附加稳定器,可以有效帮助提高电力系统的稳定性.
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 ton grid-connected PV power plant in a multi-machine power system. Firstly in the paper, a localized model of the grid-con- nected PV power plant is derived. The model gives the relationship between power oscillations a- long 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 com- pensation 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 tocalized, as it does not need to obtain and validate the information and parameters of the entire multi-machine power syste^it. ,1 v-v 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.
出处
《电力科学与技术学报》
CAS
2011年第4期5-13,共9页
Journal of Electric Power Science And Technology
基金
英国工程物理科学基金会资助(EP/F061242/1,EP/G042594/1)
关键词
多机电力系统
电力系统低频振荡
稳定器
相位补偿法
multi-machine power system
power system low-frequency oscillations
stabilizer
phase compensation method
