| 引用本文: | 张海波,袁志昌,赵宇明,刘国伟,姚森敬.VSC-MTDC系统变截距直流电压下垂控制策略[J].电力自动化设备,2016,36(10): |
| ZHANG Haibo,YUAN Zhichang,ZHAO Yuming,LIU Guowei,YAO Senjing.Variable intercept DC-voltage droop control for VSC-MTDC system[J].Electric Power Automation Equipment,2016,36(10): |
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| 摘要: |
| 针对用于风电场并网的多端柔性直流输电系统，提出一种变截距直流电压下垂控制策略。该策略通过设定新的功率参考值改变截距实现直流电压-有功功率特性调节曲线的平行移动，进行电压的调整，可将系统的直流电压控制在允许的运行范围内。若风电功率在一段时间内保持平稳，系统达到稳定运行的状态，该策略可消除电压偏差，将直流电压调节回额定值。以一典型的五端直流输电系统为例，利用EMTDC／PSCAD电磁暂态仿真验证了该控制策略的正确性，结果表明所提控制策略适用于功率频繁变化的含风电场的VSC-MTDC系统。 |
| 关键词: 风电场 电压源换流器 直流输电 直流电压下垂控制 变截距 |
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| 基金项目:国家高技术研究发展计划（863计划）资助项目（2015AA050103） |
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| Variable intercept DC-voltage droop control for VSC-MTDC system |
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ZHANG Haibo1, YUAN Zhichang1, ZHAO Yuming2, LIU Guowei2, YAO Senjing2
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1.Department of Electrical Engineering，Tsinghua University，Beijing 100084，China;2.Shenzhen Power Supply Company，Shenzhen 518048，China
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| Abstract: |
| A strategy of variable intercept DC-voltage droop control is proposed for the VSC-MTDC（Voltage Source Converter-based Multi-Terminal HVDC） system used in the grid-connection of wind farm，which changes the intercept by modifying the power reference to parallel move the characteristic curve of DC voltage vs. active power for the DC-voltage adjustment to control the DC-voltage of system within the allowable range. If the wind power remains stable for a certain period and the system operates in a stable condition，the voltage deviation will be eliminated by the proposed control strategy and the DC-voltage adjusted to the rated value. With a typical five-terminal DC transmission system as an example，the EMTDC／PSCAD simulation verifies the correctness of the proposed strategy，suitable for the VSC-MTDC system containing the wind farm with frequent power change. |
| Key words: wind farms voltage source converter HVDC power transmission DC voltage droop control variable intercept |
