基于双闭环控制的两级式光伏电源建模与仿真  

Two-stage Photovoltaic Power Supply Modeling and Simulation Based on Double Closed-loop Control

作　　者：胡雪凯 张乾 胡文平 王卓然 HU Xuekai;ZHANG Qian;HU Wenping;WANG Zhuoran(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;State Grid Hebei Electric Power Co.,Ltd.Maintenance Branch,Shijiazhuang 050070,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [2]国网河北省电力有限公司检修分公司,河北石家庄050070

出　　处：《河北电力技术》2020年第5期22-26,共5页Hebei Electric Power

基　　金：国家科技支撑计划课题(2015BAA09B01)。

摘　　要：为研究分布式电源的故障特性,需要首先搭建满足并网标准的光伏电源模型。针对两级式光伏电源,首先从其拓扑结构出发,搭建了abc坐标系下的逆变器数学模型。为解决变量均为工频交流量的问题,进行了dq旋转坐标系变换;为实现解耦控制,引入了前馈补偿。然后通过拉式变换,得到了复频域下的逆变器的数学模型,进而建立了基于双闭环控制的两级式光伏电源模型。最后在RTDS实时数字仿真平台上分别对正常运行和故障工况下各项重要指标进行了仿真分析。结果证明,所提两级式光伏电源模型满足分布式光伏电源并网标准,能够适用于工程项目分析应用。In order to study the fault characteristics of a distributed power supply,aphotovoltaic power supply model that satisfies grid-connected standards needs to be built first.For the two-stage photovoltaic power supply,this paper first sets up the mathematical model of the inverter in the abc coordinate system based on its topological structure.In order to solve the problem that the variables are all of the frequency-frequency AC,the dq rotation coordinate system is transformed;in order to realize the decoupling control introduces the feedforward compensation.Then,obtains the mathematical model of the inverter in the complex frequency domain through pull-type transformation,and establishes a two-stage photovoltaic power supply model based on double closed-loop control.Finally,the RTDS real-time digital simulation platform is used to simulate and analyzes the important indicators under normal operation and fault conditions.The results prove that the two-stage photovoltaic power supply model mentioned in this paper satisfies the grid-connected photovoltaic power supply standards and can be applied to the analysis and application of engineering projects.

关 键 词：光伏发电 两级式光伏电源 双闭环控制 逆变器 实时数字仿真平台 

分 类 号：TM673[电气工程—电力系统及自动化]