考虑电压波动和光照变化的并网光伏发电系统暂态特性分析  

Analysis of transient characteristics of photovoltaic grid-connected system considering voltage fluctuation and illumination variation

作　　者：田春筝[1] 蒋小亮[1] 丁岩[1] 关朝杰 金津[2] 胡钋[2] 

机构地区：[1]国网河南省电力公司经济技术研究院,河南郑州450052 [2]武汉大学电气工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2015年第5期680-685,共6页Engineering Journal of Wuhan University

基　　金：国网河南省电力公司科技项目(编号:AGHAJY00GHJS1400030)

摘　　要：针对光伏并网后的功率稳定问题,在PSCAD软件中建立了光伏发电系统的暂态电磁仿真模型.利用该模型研究了并网点电压波动和光照条件变化下光伏发电系统各单元的暂态响应特性.以光伏电站输入输出有功平衡为基础,分析了暂态过程中交流电流的变化情况,提出了基于交流电流变化规律的光伏电站无功补偿容量计算方法.以河南某区域电网为例,仿真分析了不同电压跌落程度下光伏电站吸收的最大无功功率;对比了不同接入方式下光伏电站光照波动所引起的并网点电压波动值.仿真算例表明,光照条件变化所引起的电压波动是限制光伏接入方式和接入容量的重要因素.A transient electromagnetic simulating PSCAD software for analyzing the power stability model of photovoltaie power system is established in problem after PV connecting to grid. The transient re- sponse characteristics of every PV unit are researched during voltage fluctuation and illumination variation. Based on the balance between power input and power output, the change of AC current in the transient procedure is analyzed; a reactive power compensation capacity computing method is proposed. A regional power grid with photovoltaic generation incorporated of Henan province is selected as case study. The maximum reactive power absorbed by photovoltaic power station during different voltage drops is simula- ted analyzed. The voltage fluctuation of the point of interconnection caused by illumination variation with different connecting method is comparatively researched. The simulation results show that the voltage fluctuation caused by illumination variation is the significant limiting factor of PV access way and capacity.

关 键 词：光伏发电系统 电压波动 光照变化 暂态功率特性 无功补偿 

分 类 号：TM615[电气工程—电力系统及自动化]