多端电压源型直流互联系统频率稳定性控制策略

HU Yi

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多端电压源型直流互联系统频率稳定性控制策略

更新时间：2025-08-13

- 多端电压源型直流互联系统频率稳定性控制策略
- Automation of Electric Power Systems Vol. 41, Issue 10, Pages: 51-57(2017)
- 作者机构：
  
  西南交通大学电气工程学院,四川省,成都市,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2017
- 稿件说明：
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HU Yi. [J]. Automation of electric power systems, 2017, 41(10): 51-57.
DOI：

HU Yi. [J]. Automation of electric power systems, 2017, 41(10): 51-57. DOI：

摘要

以提高电压源型换流器多端直流互联系统的频率稳定性为目的

提出了一种适用于多孤岛电网换流站共同参与主网频率调节的多端协调控制策略。该控制策略首先是根据互联系统的数学模型

利用非线性鲁棒控制中的反馈线性化H∞方法设计出了各孤岛电网换流站直流功率调节量的控制律。然后考虑各孤岛电网自身频率波动情况

利用单纯形法滚动优化直流功率调节量控制律中的直流功率分配系数

从而得到最优分配的直流功率调节量

保证了各换流站以最优直流电压斜率控制协调参与主电网的频率稳定调节过程。最后

在PSCAD/EMTDC中以三端柔性直流互联系统为例

通过与常规控制策略进行对比仿真

验证了所提控制策略的正确性和优越性。

Abstract

A multiport coordinated control strategy is proposed for multi-island grid converter station to participate in the main grid frequency stability regulation to heighten the frequency stability of voltage source converter based multi-terminal direct current(VSC-MTDC)system. According to the mathematical model of the interconnected system

this strategy has to design a control law for the direct current(DC)power regulatory amount of each island grid converter using the feedback linearization H∞ method in nonlinear robust control. Secondly

in consideration of the frequency fluctuations of each island grid

this strategy uses the simplex method to optimize the DC power distribution coefficient for the control rate of DC power adjustment amount

thereby obtaining the DC power adjustment amount of optimal allocation and ensuring coordinated participation by all island grids in the main grid frequency stability adjustment process with optimal DC voltage droop control. Finally

a three-terminal VSC-MTDC system is set up on PSCAD/EMTDC. Comparison of simulation results with those of conventional control strategy shows the correctness and superiority of the proposed control strategy. This work is supported by Post-doctoral Science Foundation of China(No. 2015M582543).

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