| 引用本文: | 郑 征,李佩柯,李绍令,等.模块化多电平变换器分数阶PIl环流抑制策略[J].电力系统保护与控制,2023,51(1):113-121.[点击复制] |
| ZHENG Zheng,LI Peike,LI Shaoling,et al.Fractional order PIλ circulating current suppressing strategy for modular multilevel converter[J].Power System Protection and Control,2023,51(1):113-121[点击复制] |
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| 摘要: |
| 模块化多电平变换器(modular multilevel converter, MMC)内部环流增加系统功率损耗，加剧桥臂电流畸变。针对传统PI环流控制器存在鲁棒性较差、控制精度有限等问题，将分数阶PI 控制器应用于MMC环流抑制。首先，对MMC工作特性进行分析，阐述环流产生机理。其次，研究分数阶PI 控制结构，并设计MMC分数阶PI 环流抑制策略。然后，采用经典频域法优化分数阶PI 控制器参数，并对分别采用传统PI和分数阶PI 控制器的系统环流控制性能进行对比分析。最后，在相同条件下，通过对采用上述两种环流抑制策略的MMC系统，分别在电源扰动、直流侧电压阶跃和三相不平衡工况下进行仿真研究。结果表明，分数阶PI 环流抑制器的抗电源扰动性和环流抑制能力均优于传统PI环流抑制器，更适用于MMC此类的非线性系统的控制。 |
| 关键词: 模块化多电平变换器 环流抑制 分数阶FO-PI |
| DOI：10.19783/j.cnki.pspc.220367 |
| 投稿时间：2022-03-20修订日期：2022-07-13 |
| 基金项目:国家自然科学基金项目资助(61703144)；河南省科技攻关项目资助(222102240027)；河南省高等学校重点科研项目资助(20A470005) |
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| Fractional order PIλ circulating current suppressing strategy for modular multilevel converter |
| ZHENG Zheng,LI Peike,LI Shaoling,WANG Xiaoshuai,JIN Tingting |
| (School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China) |
| Abstract: |
| The system power loss and bridge arm current distortion of a modular multilevel converter (MMC) are increased by the circulating current. In view of the poor robustness and limited control accuracy of the traditional PI circulating current controller, the fractional order PIλ controller is applied to MMC circulating current suppressing. First, the working characteristics of MMC are analyzed, and the mechanism of circulating current generation is described. Second, the fractional order PIλ control structure is studied and the fractional order PIλ circulating current suppressing strategy is designed. Then, the classical frequency domain method is used to optimize the fractional order PIλ controller parameters, and the circulating current control performance of the system using traditional PI controller and fractional order PIλ controller is analyzed. Finally, under the same conditions, the system with fractional order PIλ circulating current suppressing strategy and traditional PI circulating current suppressing strategy are simulated under AC power disturbance, DC-side voltage step and three-phase unbalance conditions respectively. The results show that the designed fractional order PIλ circulating current controller outperforms the traditional PI circulating current controller in anti-power disturbance and circulating current suppressing, and is more suitable for nonlinear systems such as MMC.
This work is supported by the National Natural Science Foundation of China (No. 61703144). |
| Key words: modular multilevel converter circulating current suppressing fractional order FO-PIl |
