Stability Analysis of Grid-connected Multi-parallel PCS for Energy Storage System Under PI Control

XUE Yushi; XU Shaohua; LI Jianlin; HUI Dong

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Stability Analysis of Grid-connected Multi-parallel PCS for Energy Storage System Under PI Control

更新时间：2025-12-08

- Stability Analysis of Grid-connected Multi-parallel PCS for Energy Storage System Under PI Control
- Vol. 44, Issue 1, Pages: 136-144(2018)
- 作者机构：
  
  1. 华北电力大学电气与电子工程学院
  2. 中国电力科学研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 January 2018，
  
  Published：2018
- 稿件说明：
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XUE Yushi, XU Shaohua, LI Jianlin, et al. Stability Analysis of Grid-connected Multi-parallel PCS for Energy Storage System Under PI Control[J]. 2018, 44(1): 136-144.
DOI：

XUE Yushi, XU Shaohua, LI Jianlin, et al. Stability Analysis of Grid-connected Multi-parallel PCS for Energy Storage System Under PI Control[J]. 2018, 44(1): 136-144. DOI：

摘要

为了保证储能电站的安全稳定运行

研究了比例积分（PI）控制下储能并网变流器（PCS）的并联稳定性。首先通过等效变换的方法

用电容电流反馈等效虚拟电阻

建立了单台PCS控制模型

提出了一种dq坐标系下易于实现的全解耦并网控制策略

之后通过诺顿等效电路建立了电网阻抗存在时多台PCS并联运行模型

并对并联模型极点分布情况进行分析

结合劳斯判据给出了PCS并联系统虚拟电阻的稳定区间。结果表明:当控制参数中虚拟电阻取值在稳定区间范围内时

多台PCS并联可以稳定运行

若虚拟电阻在限定范围之外

则会产生谐振。最后

在simulink平台搭建了PCS并联运行仿真模型

仿真的结果验证了该理论的正确性。

Abstract

In order to ensure the safe and stable operation of energy storage power station

the stability of multi-parallel energy storage power converter system（PCS） under PI control was studied.First

a fully decoupled control strategy was proposed in the dq coordinate system.Through the equivalent transformation

a single PCS control model based on virtual resistance was established.Then the multi-parallel PCS model with grid impedance was established by the Norton equivalent circuit

the distribution of its poles was analyzed

and the stability interval of the virtual resistance was given by the Routh criterion.The results show that when the virtual resistance of the control parameters is within the stable range

multi-parallel PCS can operate stably

and if the virtual resistance is outside the limited range

resonance occurs.Finally

a multi-parallel PCS simulation model is built on the simulink platform

and the correctness of the theory is verified by the simulation results.

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