桥臂不对称情形下MMC无源性PI控制方法

doi:10.11930/j.issn.1004-9649.202211082

中国电力 ›› 2023, Vol. 56 ›› Issue (7): 107-116,124.DOI: 10.11930/j.issn.1004-9649.202211082

桥臂不对称情形下MMC无源性PI控制方法

陈程¹, 薛花¹, 扈曾辉², 王育飞¹

1. 上海电力大学电气工程学院，上海 200090;
2. 中国移动通信集团山东有限公司济宁分公司，山东济宁 272000

收稿日期:2022-11-20 修回日期:2023-03-23 发布日期:2023-07-28
作者简介:陈程(1996-),男,硕士研究生,从事电力变换应用技术和电能质量分析与控制研究,E-mail:1097848868@qq.com;薛花(1979-),女,博士,副教授,从事大功率新能源并网逆变技术和非线性理论与控制方法研究,E-mail:xuehua@shiep.edu.cn;扈曾辉(1995-),男,硕士研究生,从事模块化多电平变换器控制技术和新能源并网逆变技术研究,E-mail:huzenghui@sd.chinamobile.com;王育飞(1974-),男,通信作者,博士,教授,从事电力储能应用技术、电能质量分析、混沌理论与应用研究,E-mail:wangyufei@shiep.edu.cn
基金资助:
上海市科委地方能力建设项目（面向新型电力系统的规模化储能电站应用关键技术研究，22010501400）

Passivity-Based PI Control Method of MMC with Asymmetric Bridge Arms

CHEN Cheng¹, XUE Hua¹, HU Zenghui², WANG Yufei¹

1. Electric Power Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. China Mobile Communications Group Shandong Co., Ltd., Jining Branch, Jining 272000, China

Received:2022-11-20 Revised:2023-03-23 Published:2023-07-28
Supported by:
This work is supported by Local Capacity Building Project of Shanghai Municipal Science and Technology Commission (Research on Key Technologies for the Application of Large-Scale Energy Storage Power Plants for New Power Systems, No.22010501400).

摘要/Abstract

摘要： 考虑模块化多电平变换器（modular multilevel converter， MMC）桥臂不对称情形，针对环流基频分量不对称引起的dq解耦变换误差问题，提出基于双线性模型的无源性PI控制方法，实现故障相电容电压保持稳定、不对称环流分量的准确抑制、三相并网电流的平衡输出。在abc坐标系下，建立桥臂不对称情形下MMC双线性模型，完成非线性系统控制变量随状态变量同步变化的线性化转换，简化控制器设计，避免dq解耦变换引入的控制误差。从系统全局能量耗散特性出发，设计形式简单的无源性PI控制器，实现子模块电容电压纹波快速抑制，消除桥臂电流不对称性，同时确保闭环控制系统全局渐近稳定运行。基于Matlab的仿真结果验证了所提控制策略能够有效抑制MMC桥臂不对称的不利影响，具有响应快速、稳定性好、鲁棒性强的特点。

关键词: 模块化多电平变换器, 桥臂不对称, 无源性PI控制, 双线性模型

Abstract: Considering asymmetric bridge arms of modular multilevel converter (MMC), a passivity-based PI control method based on the bilinear model is proposed to address the dq decoupling transformation errors caused by the fundamental frequency component asymmetry of circulating currents,, which can achieve stable fault phase capacitor voltage, accurate suppression of asymmetric circulating current components and balanced output of three-phase grid-connected currents. Firstly the MMC bilinear model under the condition of asymmetric bridge arm is established in the abc coordinate. Then the linear transformation of the nonlinear system is conducted, in which the control variables are adjusted synchronously with the state variables. In this way the controller design is simplified and the control errors introduced by the dq decoupling transformation are diminished. Based on the global energy dissipation characteristics of the system, a simple passivity-based PI controller is designed to quickly suppress the sub-module capacitor voltage ripple, eliminate the current asymmetry of the bridge arm, and hence ensure the global asymptotically stable operation of the closed-loop control system. The simulation results based on MATLAB has verified that the proposed control method can effectively suppress the adverse effects from the asymmetric bridge arm, and exhibits its capability of fast response, strong stability and high robustness.

Key words: modular multilevel converter (MMC), asymmetric bridge arm, passivity-based PI control, bilinear model

陈程, 薛花, 扈曾辉, 王育飞. 桥臂不对称情形下MMC无源性PI控制方法[J]. 中国电力, 2023, 56(7): 107-116,124.

CHEN Cheng, XUE Hua, HU Zenghui, WANG Yufei. Passivity-Based PI Control Method of MMC with Asymmetric Bridge Arms[J]. Electric Power, 2023, 56(7): 107-116,124.

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桥臂不对称情形下MMC无源性PI控制方法

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