Research on equivalent modeling of homologous photovoltaic systems based on real time digital simulation

WANG Jian′an; ZHU Wenjun; ZOU Qiang; LI Gang; HUANG Ruhai

doi:10.3969/j.issn.1672-3643.2023.06.006

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Research on equivalent modeling of homologous photovoltaic systems based on real time digital simulation

更新时间：2026-09-14

- Research on equivalent modeling of homologous photovoltaic systems based on real time digital simulation
- Ningxia Electric Power Issue 6, (2023)
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- DOI：10.3969/j.issn.1672-3643.2023.06.006
  CLC：
- Online First：19 November 2023，
  
  Published：2023
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WANG Jian′an, ZHU Wenjun, ZOU Qiang, et al. Research on equivalent modeling of homologous photovoltaic systems based on real time digital simulation[J]. Ningxia Electric Power, 2023, (6).
DOI：

WANG Jian′an, ZHU Wenjun, ZOU Qiang, et al. Research on equivalent modeling of homologous photovoltaic systems based on real time digital simulation[J]. Ningxia Electric Power, 2023, (6). DOI： 10.3969/j.issn.1672-3643.2023.06.006.

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。

Abstract

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.

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