Dynamic Phasor Model of Grid-Connected Photovoltaic System in MATLAB/Simulink Considering Low Voltage Ride through Characteristics for Voltage Stability Analysis of Power System

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-03-15 DOI:10.51316/jst.156.etsd.2022.32.1.8

Tien Luan Dinh, H. Nguyen, Q. Hoang, Minh Ngoc

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Abstract

This paper proposes a model of grid-connected photovoltaic (PV) system with low voltage ride through (LVRT) characteristic in MATLAB/Simulink based on dynamic phasor approach. Unlike all PV system models available in MATLAB/Simulink using detailed model with small capacity, the proposed model focuses on control loops of PV system to simulate a large capacity system that is appropriate for voltage stability analysis of power system installing high penetration level of PV generation. An intuitive and convenient tool for adjusting the LVRT characteristics of the PV system is also developed. The effectiveness of dynamic phasor model and the impact of the LVRT characteristic of the PV system on voltage stability are examined through MATLAB/Simulink simulations conducted on IEEE 9-bus test system. The simulation results provide an insight of how the system integrated with a large PV generation behaves under the disturbances. It also points out that the LVRT of the PV system is very important to the power system voltage stability.

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考虑低压穿越特性的并网光伏系统动态相量MATLAB/Simulink模型用于电力系统电压稳定性分析

基于动态相量法，在MATLAB/Simulink中建立了具有低电压穿越特性的并网光伏系统模型。与MATLAB/Simulink中现有的所有光伏系统模型采用小容量的详细模型不同，本文提出的模型以光伏系统的控制回路为重点，模拟大容量系统，适用于安装高渗透水平光伏发电的电力系统的电压稳定性分析。开发了一种直观、方便的调节光伏系统LVRT特性的工具。通过MATLAB/Simulink在IEEE 9总线测试系统上进行仿真，验证了动态相量模型的有效性以及光伏系统LVRT特性对电压稳定性的影响。仿真结果提供了与大型光伏发电集成的系统在干扰下的行为。指出了光伏系统的低电压电压对电力系统电压稳定的重要作用。

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JST: Engineering and Technology for Sustainable Development

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