| 引用本文: | 许 烽,徐 政,刘高任,黄弘扬.基于F-MMC和LCC的混合型三极直流系统及其控制策略[J].电力自动化设备,2014,34(10): |
| XU Feng,XU Zheng,LIU Gaoren,HUANG Hongyang.Hybrid tripole HVDC system based on F-MMC and LCC，and its control strategy[J].Electric Power Automation Equipment,2014,34(10): |
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| 摘要: |
| 现有的三极直流输电系统因极3采用晶闸管换流器而存在交流电压易波动、过渡阶段易引发过电压和过电流等固有缺陷。为此提出了一种改进式的混合型系统，即极3换流站改用基于全桥子模块的模块化多电平换流器。为使系统获得较好的响应特性，提出了无功（电压）平衡、电流平衡和子模块电容电压平衡3个控制要求，并根据控制要求给出了模块化多电平换流器采用改进直流电流控制和交流电压控制、子模块采用电容电压平衡控制等控制措施。利用时域仿真软件PSCAD／EMTDC对所提出的系统进行了仿真研究，仿真结果验证了所提出的混合型三极直流系统及其控制策略能够很好地实现系统电压平衡、电流平衡和子模块电容电压平衡。 |
| 关键词: 直流输电 混合型三极直流 电网换相换流器 全桥模块化多电平换流器 无功（电压）平衡 电流平衡 电容电压平衡 控制 |
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| 基金项目:基金项目：国家高技术研究发展计划（863计划）资助项目（2012-AA050205） |
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| Hybrid tripole HVDC system based on F-MMC and LCC，and its control strategy |
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XU Feng, XU Zheng, LIU Gaoren, HUANG Hongyang
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College of Electrical Engineering，Zhejiang University，Hangzhou 310027，China
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| Abstract: |
| The existing tripole HVDC system adopts the thyristor converter as its pole 3，which causes AC voltage fluctuation and transition overvoltage／overcurrent. An improved hybrid tripole HVDC system is proposed，which adopts the modular multilevel converter based on the cascaded FBSM（Full Bridge Sub-Modules） as its pole 3. For better response performance，it is required to control the reactive power （voltage） balance，DC current balance and sub-module capacitor voltage balance. The modified current control and AC voltage control are proposed for the modular multilevel converter and the capacitor voltage balance control is proposed for the FBSM. The proposed system is simulated with PSCAD／EMTDC and results show that，the proposed system with given control strategy realizes the voltage balance，DC current balance and capacitor voltage balance perfectly. |
| Key words: DC power transmission hybrid tripole HVDC LCC（Ｌine Commutated Converter） F-MMC reactive power（voltage） balance current balance capacitor voltage balance control |
