含大规模光储系统的电网暂态稳定特性分析

Analysis on Transient Stability Characteristics of Power Grid with Large scale Photovoltaic Energy Storage System

摘要:

大规模光伏和储能接入电网使电网的暂态特性复杂化、暂态稳定问题多样化。为了明确大规模光伏和储能对电网暂态稳定性的影响，在仿真软件中搭建了含大规模光储系统的某地区电网仿真模型，分析了不同系统结构参数和变流器控制参数对含大规模光储系统的电网暂态稳定特性的影响：对于系统结构参数，研究光伏渗透率和储能光伏容量比对系统暂态稳定性的影响；对于变流器控制参数，分析光伏低电压穿越控制参数对系统暂态稳定性影响。并基于此研究了提升系统暂态稳定性的控制参数调整措施，可为光伏储能并网规划和运行提供实证参考。

Abstract:

The integration of large-scale photovoltaic (PV) and energy storage into power grid has introduced complexity to the transient characteristics of the grid, resulting in diverse transient stability issues. In order to understand the impact of large-scale PV and energy storage on transient stability of power grid, a simulation model of a regional power grid with a large-scale PV and energy storage system is constructed using simulation software, and the effects of different system structural parameters and inverter control parameters on transient stability characteristics of power grid with large-scale PV and energy storage system are analyzed. Firstly, the influence of PV penetration rate and PV-storage capacity ratio on transient stability is investigated for system structural parameters. And then, the impact of PV low voltage ride-through control parameters on transient stability is analyzed for inverter control parameters. On this basis, adjustment measures for control parameters are studied to enhance the transient stability of the system, which can provide an example to refer for the planning and operation of grid-connected PV and energy storage systems.