Influence of Back-to-back Converter Regulator Parameters and Transmission Power Variation on Impedance Stability and Improved Control Strategy

JIANG Yuxia; TIAN Yanjun; LI Yonggang

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Influence of Back-to-back Converter Regulator Parameters and Transmission Power Variation on Impedance Stability and Improved Control Strategy

更新时间：2025-12-08

- Influence of Back-to-back Converter Regulator Parameters and Transmission Power Variation on Impedance Stability and Improved Control Strategy
- Vol. 45, Issue 9, Pages: 2866-2875(2019)
- 作者机构：
  
  华北电力大学分布式储能与微网河北省重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 September 2019，
  
  Published：2019
- 稿件说明：
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JIANG Yuxia, TIAN Yanjun, LI Yonggang. Influence of Back-to-back Converter Regulator Parameters and Transmission Power Variation on Impedance Stability and Improved Control Strategy[J]. 2019, 45(9): 2866-2875.
DOI：

JIANG Yuxia, TIAN Yanjun, LI Yonggang. Influence of Back-to-back Converter Regulator Parameters and Transmission Power Variation on Impedance Stability and Improved Control Strategy[J]. 2019, 45(9): 2866-2875. DOI：

摘要

两个变流器串联构成级联系统

其稳定性不仅取决于单个变流器的稳定性

还受两者级联间的最小环路比影响。针对三相背靠背变流器级联系统

以电压电流双闭环控制、恒功率控制分别作为整流器及逆变器的控制方式

对直流端整流器输出阻抗、逆变器输入阻抗分别建立数学模型

通过伯特图分析各个环节PI参数及输出功率对输入输出阻抗的影响

继而借助奈奎斯特曲线研究对级联系统稳定性造成的扰动。同时

针对参数变化对级联系统直流端阻抗的影响

在逆变端加入前馈电压

有效改善了逆变器输入阻抗特性

从而系统稳定性得到改善。

Abstract

The cascaded system is composed of two converters in series whose stability depends on not only the stability of the single converter

but also the minor loop gain between the two converters. We proposed a three-phase back-to-back converter cascaded system to research the impedance characteristics. Moreover

we established mathematical models

respectively

to calculate the output impedance of the rectifier with double-closed-loop control of voltage and current as well as the input impedance of the inverter with constant power control in a DC terminal. Based on mathematical models

the influences of PI parameters and output power on impedance were analyzed by Bode Plot. Meanwhile

the perturbance of PI parameters and output power on cascaded system stability were studied through Nyquist curve. Moreover

in view of the effect of parameter variation on the dc terminal impedance

adding feedforward voltage improved input impedance of inverter effectively and cascaded system stability was optimized.

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