并网光伏电站的动态建模与稳定性研究  

Research on Dynamic Modeling and Stability of Grid-connected Photovoltaic Power Station

作　　者：李乃永[1] 梁军[1] 赵义术 

机构地区：[1]山东大学电气工程学院,山东省济南市250061 [2]国网技术学院,山东省济南市250002

出　　处：《中国电机工程学报》2011年第10期12-18,共7页Proceedings of the CSEE

基　　金：山东电力集团公司重大科技项目(2009A-06-1)~~

摘　　要：研究了并网光伏电站动态数学建模与稳定性问题。首先,在考虑电站不同功率控制方式(比如最大功率跟踪控制、定功率控制等)的基础上,建立了可用于电力系统稳定性分析的并网光伏电站的动态数学模型。该模型用微分和代数方程组来描述,便于与表征电力系统动态行为的微分和代数方程组联立求解系统稳定性等动态问题。其次,提出了并网光伏电站在最大功率跟踪(maximum power point tracking,MPPT)控制方式和定功率控制(constant power control,CPC)方式下的系统稳定性判据,该判据仅由光伏阵列出口测量的电压和功率数据即可充分判断光伏电站系统的稳定性,为实施稳定性检测和控制提供了理论依据。最后以济南市某1.6 MW并网光伏电站为算例,验证了所建光伏电站动态模型和所提出的稳定性判据的正确性和可行性。Dynamic modeling and stability of grid-connected photovoltaic （PV） power stations were researched. First, a dynamic mathematical model for stability analysis of grid-connected PV power stations was established, considering different power control modes, such as maximum power tracking control, constant power control, etc. This model is described with differential and algebraic equations, so as to conveniently solve the dynamic stability problem by combining the differential and the algebraic equations characterizing the traditional dynamic behavior of power systems. Second, a stability criterion was proposed for grid-connected PV power stations under the maximum power point tracking （MPPT） control mode and the constant power control （CPC） mode respectively. According to this criterion, the stability of the PV power system can be fully determined by using the PV array voltage and the measured power data; in the meanwhile, this criterion can provide theoretical basis for the implementation of stability detection and stability control. Finally, based on a 1.6MW grid-connected PV power station in Jinan, simulations were given to verify the validity and the feasibility of the proposed stability criterion and the dynamic model for PV power stations.

关 键 词：光伏电站 并网 数学建模 稳定性 判据 

分 类 号：TM71[电气工程—电力系统及自动化]