基于实时数字仿真系统的同群光伏系统等值建模研究  

Research on equivalent modeling of homologousphotovoltaic systems based on real time digital simulation

作　　者：王建安[1] 祝文军 邹强[1] 李钢[1] 黄如海[1] WANG Jian′an;ZHU Wenjun;ZOU Qiang;LI Gang;HUANG Ruhai(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China;Qinghai Shaanxi Coal New Energy Technology Co.,Ltd.,Xining Qinghai 810001,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102 [2]青海陕煤新能源科技有限公司,青海西宁810001

出　　处：《宁夏电力》2023年第6期34-40,共7页Ningxia Electric Power

摘　　要：研究了同群光伏系统等值建模的原理和特点,针对倍乘等值方法的不足,提出一种基于变流器输入阻抗不变的聚合等值方法。以某典型光伏系统为例,在实时数字仿真系统(real time digital simulation system, RTDS)中分别搭建了30台参数相同的1 MW光伏多机参考模型、1台30 MW光伏倍乘模型和1台30 MW光伏聚合模型。通过仿真试验,比对这3个模型在光伏系统公共并网点(point of common coupling, PCC)的故障穿越、有功阶跃、频率偏移等暂态特性及阻抗频率特性。结果表明,3个模型的暂态特性基本相同,倍乘模型与参考模型的阻抗频率特性有明显差异,而聚合模型与参考模型的阻抗频率特性高度一致。This paper explores the principle and characteristics of equivalent modeling of homologous photovoltaic systems.Considering the drawbacks of the scaling equivalent method,an aggregation equivalent approach,which maintains a constant converter impedance,is proposed.Based on a typical PV system,three distinct models were developed within the real time digital simulation framework:thirty 1 MW PV reference models,a singular 30 MW PV scaling model,and a 30 MW PV aggregation model with matching parameters.Simulation tests compared these models on several fronts,including fault ride-through,active power step response,frequency deviation,as well as impedance-frequency characteristics at the point of common coupling system.The results show that while the transient characteristics of the three models are basically the same,there are noticeable disparities between the impedance-frequency features of the scaling model and reference models.Conversely,the impedance-frequency characteristics of the aggregation model align with those of the reference model.

关 键 词：光伏系统 等值建模 倍乘模型 聚合模型 暂态特性 阻抗频率特性 

分 类 号：TM615[电气工程—电力系统及自动化]