带恒功率负载的交直流混合微电网系统大信号稳定性分析

doi:10.19595/j.cnki.1000-6753.tces.L90154

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摘要

在交直流混合微电网系统中,绝大部分负载都是通过电力电子变换器与微网母线连接,闭环控制的电力电子变换装置可视为恒功率负载,具有负阻抗特性,在扰动情况下,会影响系统稳定性,甚至导致整个系统无法正常工作。该文考虑恒功率负载动态性能,在储能单元充、放电模式下应用混合势函数理论对并网交直流混合微电网系统进行大信号稳定性分析。首先,将整个系统等效为dq旋转坐标系下的直流系统。接着分别建立储能单元充、放电的混合势函数模型,进行稳定性分析,得出系统大信号稳定性判据。所得到的大信号稳定性判据给出了直流侧稳压电容、交流侧滤波电感、互联变流器电流内环控制参数k_ip、电压外环控制参数k_vp与系统能带恒功率负载功率最大值的关系。对比可知,当储能单元由充电变为放电时,交直流混合微电网系统能带恒功率负载的功率最大值显著增加。最后,应用Matlab软件搭建交直流混合微电网系统仿真模型,仿真结果表明,所提判据能够保证交直流混合微电网系统大扰动下的稳定性。

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	刘欣博
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关键词 ：恒功率负载, 交直流混合微电网, 混合势函数, 大信号稳定性分析

Abstract：

In hybrid AC/DC Microgrid, the tightly regulated loads could be regarded as constant power loads (CPLs), usually inducing negative impedance instability problems. This paper investigates large signal stability of hybrid AC/DC microgrid in grid-connected mode based on mixed potential theory, and the characteristics of CPLs are considered in the storage system charging and discharging mode. Firstly, the entire system is converted from abc frame to dq rotating frame. Then the mixed potential models are built, and large signal stability criteria are derived. The obtained criteria interpret relationships among the maximum power of the CPLs, the capacitance, the inductance, the control parameter k_ip of the current inner loop and the control parameter k_vp of the voltage outer loop. When the storage system changes from charging to discharging mode, the maximum power of the CPLs that the system can support would increase significantly. Finally, simulation results are used to verify the validity of the obtained criteria.

Key words： Constant power loads (CPLs) hybrid AC/DC microgrid mixed potential theory large signal stability analysis

收稿日期: 2020-06-30

PACS:

TM711

基金资助:

北京市教委科技类一般资助项目（KM201910009010）

通讯作者: 刘欣博女,1982年生,博士,副教授,研究方向为微电网系统稳定控制。E-mail: liuxinbo@ncut.edu.cn

作者简介: 孙晓溪女,1996年生,硕士研究生,研究方向为储能变流器动态性能分析。E-mail: 813255116@qq.com

引用本文:

刘欣博, 孙晓溪, 宋晓通. 带恒功率负载的交直流混合微电网系统大信号稳定性分析[J]. 电工技术学报, 2021, 36(zk1): 115-125. Liu Xinbo, Sun Xiaoxi, Song Xiaotong. Large-Disturbance Stability Analysis of Hybrid AC/DC Microgrid with Constant Power Loads. Transactions of China Electrotechnical Society, 2021, 36(zk1): 115-125.

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