| 不平衡电网电压下MMC的比例降阶谐振控制策略* |
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| 引用本文： | 宋平岗,吴继珍,邹欢.不平衡电网电压下MMC的比例降阶谐振控制策略*[J].电测与仪表,2017,54(2). |
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| 作者姓名： | 宋平岗 吴继珍 邹欢 |
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| 作者单位： | 华东交通大学电气与电子工程学院,南昌,330013 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 当电网电压出现不平衡时,模块化多电平换流器(modular multilevel converter,MMC)型高压直流输电(high current direct current,HVDC)系统的电能传输将受到明显影响。针对该问题,文章首先分析了不平衡故障时MMC的相关内、外特性,指出在不同不平衡控制目标下MMC内部均可能出现零序环流,零序环流流入直流侧将引起直流电压/电流的二倍频波动;然后在αβ坐标系下建立MMC不平衡控制系统,基于比例降阶谐振调节器设计电流内环和环流抑制控制器;仿真结果验证了文章所提出控制策略的有效性。
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| 关 键 词： | 模块化多电平换流器 高压直流输电 电网电压不平衡 零序环流 比例降阶谐振调节器 |
| 收稿时间： | 2015/8/5 0:00:00 |
| 修稿时间： | 2015/11/27 0:00:00 |
Proportional Reduced Order Resonant Control Strategy for MMC Under Unbalanced grid Voltage Conditions |
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| SONG Pinggang,WU Jizhen and ZOU Huan.Proportional Reduced Order Resonant Control Strategy for MMC Under Unbalanced grid Voltage Conditions[J].Electrical Measurement & Instrumentation,2017,54(2). |
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| Authors: | SONG Pinggang WU Jizhen and ZOU Huan |
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| Affiliation: | College of Electrical and Electronic Engineering,East China Jiaotong University,College of Electrical and Electronic Engineering,East China Jiaotong University,College of Electrical and Electronic Engineering,East China Jiaotong University |
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| Abstract: | Under unbalanced grid voltage conditions,the power transmission quality of MMC-HVDC (modular multi-level converter-high current direct current) will be significantly affected.To solve this problem,the correlative internal and external characteristics of MMC are analyzed at first in this paper,and it is indicated that the zero-sequence circulating current always exists in MMC under different unbalanced control targets,and the twice fundamental harmonic frequency fluctuation of dc-link voltage and current will be caused when the zero-sequence circulating current flows into dc-side,and then,a control system of MMC under unbalance conditions is built in α-β coordinate system.Both the internal current-loop controller and the circulating current suppressing controller are designed based on proportional reduced-order resonant (P-ROR) regulator.It is verified that the proposed strategy is very effective with the simulation results |
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| Keywords: | Keywords : modular multilevel converter (MMC) high voltage direct current (HVDC) unbalance grid voltage zero sequence circulating current proportional reduced-order resonant (P-ROR) regulator |
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