| 引用本文: | 喻 锋,王西田,解 大.多端柔性直流下垂控制的功率参考值修正方法[J].电力自动化设备,2015,35(11): |
| YU Feng,WANG Xitian,XIE Da.Power reference correction method for droop control of VSC-MTDC system[J].Electric Power Automation Equipment,2015,35(11): |
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| 摘要: |
| 基于电压源型换流器的多端柔性直流输电（VSC-MTDC）所采用的外环有功控制方式会对直流系统潮流分布造成影响。首先提出了电压源型换流器外环有功控制通用模型，该模型基本涵盖了常用的外环有功控制方式。基于该模型推导直流网络潮流计算方法。采用直流电压下垂控制的换流器其直流输送功率会与参考值偏离，为了提高直流系统输送能力，提出了根据期望输送功率对直流功率参考值进行修正的方法。最后通过PSCAD／EMTDC时域仿真模型与潮流计算的结果对比，对所提出潮流计算及直流功率参考值修正方法的有效性进行验证。结果表明所提出的功率参考值设定方法可以使采用下垂控制的多端直流系统按期望功率传输。 |
| 关键词: 潮流 电压源型换流器 多端柔性直流输电 功率控制 下垂控制 |
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| Power reference correction method for droop control of VSC-MTDC system |
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YU Feng, WANG Xitian, XIE Da
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Key Laboratory of Control of Power Transmission and Transformation，Department of Electrical Engineering，Shanghai Jiao Tong University，Shanghai 200240，China
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| Abstract: |
| The power flow distribution of DC system is influenced by the outer-loop active-power control mode of VSC-MTDC（Voltage Source Converter based Multi-Terminal Direct Current）. A universal model of outer-loop active-power controller of VSC is proposed，covering common outer-loop active-power control modes. A method of power flow calculation for DC grid is derived based on the proposed model. The DC transfer power of converter adopting the DC voltage droop control may deviate from its reference，for which，a method of DC transfer power reference correction according to its expectation is proposed to improve the transfer capacity of DC system. The results of PSCAD／EMTDC time-domain model simulation and power flow calculation are compared to verify the effectiveness of the proposed power flow calculation and reference correction methods，which show that，the expected power transfer of MTDC system with droop control is realized by using the proposed power reference correction method. |
| Key words: power flow voltage source converter MTDC power control droop control |
