| 引用本文: | 袁旭峰,高 璐,文劲宇,程时杰.VSC- HVDC三相不平衡控制策略[J].电力自动化设备,2010,(9): |
| YUAN Xufeng,GAO Lu,WEN Jinyu,CHENG Shijie.Unbalanced three-phase control strategy of VSC-HVDC system[J].Electric Power Automation Equipment,2010,(9): |
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| 摘要: |
| 分析了电网三相不平衡时电压源换流器高压直流输电（VSC- HVDC）系统的谐波传递特性，设计了一种基于瞬时对称分量法的序分量检测技术，适用于VSC- HVDC系统的正、负序双回路的双闭环控制策略。该控制策略利用瞬时对称分量变换获取电压和电流的无延迟正、负序分量，不仅在时域范围内对传统对称分量法进行了扩展，而且也解决了正、负序分解时所带来的延迟问题。另外，提出在三相不平衡电力系统的控制中增加一个不平衡指令补偿模块，改善VSC- HVDC系统在电网三相不平衡时的运行特性。最后，在仿真软件PSCAD ／ EMTDC的环境下建立了一个VSC- HVDC系统及相关控制策略，验证了所设计控制策略的正确性。 |
| 关键词: VSC- HVDC系统 三相不平衡 谐波传递特性 瞬时对称分量法 双闭环控制策略 |
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| 基金项目:贵州省科学技术基金资助项目（黔科合J字[2008]2212号） |
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| Unbalanced three-phase control strategy of VSC-HVDC system |
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YUAN Xufeng1, GAO Lu1, WEN Jinyu2, CHENG Shijie2
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1.College of Electric Engineering，Guizhou University，Guiyang 550003，China;2.Hubei Electric Power Security and High Efficiency Key Lab，Huazhong University of Science and Technology，Wuhan 430074，China
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| Abstract: |
| The harmonic transfer characteristics of VSC-HVDC system in three-phase imbalance are analyzed and a dual-circuit and dual-loop current control strategy based on the detection technique of instantaneous symmetrical components is proposed for it，which acquires the sequence components of voltage and current without time delay by the instantaneous symmetrical component transformation and extends the conventional symmetrical component method in time domain. An imbalance instruction compensator is added to improve the operating characteristics of VSC-HVDC system in three-phase imbalance. A VSC-HVDC system and its control strategy are built with PSCAD／EMTDC and the simulative results show the correctness of the proposed strategy. |
| Key words: VSC-HVDC system three-phase imbalance harmonic transfer instantaneous symmetrical component dual-loop control scheme |
