基于平坦系统的VSC-HVDC控制

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摘要简述平坦系统和基于平坦系统的控制策略的概念;建立电压源变流器型直流输电(VSC-HVDC)的状态方程, 证明VSC-HVDC可以作为平坦系统。将变流器输出电流作为平坦输出向量, 利用平坦系统控制理论建立VSC-HVDC的双环控制系统;控制外环根据控制目标产生电流的参考轨迹;控制内环利用前馈和反馈控制输出电流, 即用平坦输出和输入之间的函数关系产生输出电流的前馈分量, 用比例积分控制产生消除误差的反馈分量。用仿真软件建立VSC-HVDC模型, 通过仿真分析功率阶跃变化和电网接地故障时系统的响应情况, 并和传统的串级控制进行比较, 结果显示平坦系统控制使系统的波动更小。最后得出结论:基于平坦系统的控制策略可以显著提高VSC-HVDC系统的动态性能。

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	何大清
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关键词 ：电压源变流器型高压直流输电, 串级控制, 平坦系统, 前馈, 反馈, 动态响应

Abstract：The paper briefly introduces the principle of flatness and flatness-based control. It sets up the dynamic equation of voltage source converter high voltage direct current (VSC-HVDC) and proves it is flat. Assuming the output current as flat output vector, a double loop control based on flatness is applied with VSC-HVDC. The outer loop generates the current reference according the requirement of targets. The inner loop outputs the control input for current by feed forward and feed back. Between them, the feed forward control comes from the relationship between flat output and flat input while the feed back control comes from the proportional integral controller for error. The simulation model of VSC-HVDC is set up by software, and the command step jumping and the grounded fault are simulated under the flatness-based control. The result shows the oscillation is smaller than that of the conventional cascade control. Finally, it concludes the flatness-based control can enhance the dynamic performance of VSC-HVDC.

Key words： Voltage source converter-high voltage direct current cascade control flatness feed forward feed back dynamic response

收稿日期: 2010-12-13 出版日期: 2014-03-20

PACS:

TM721

基金资助:上海市科技发展基金(08DZ1200504、09DZ1201303和10DZ1203902)和高等学校博士点基金(20100073110019)资助项目。

作者简介: 何大清男, 1973年生, 博士研究生, 工程师, 研究方向为柔性直流输电系统和海上风场电网控制。蔡旭男, 1964年生, 博士, 教授, 博士生导师, 研究方向配网安全技术、大功率电力电子在电力系统的应用。

引用本文:

何大清, 蔡旭. 基于平坦系统的VSC-HVDC控制[J]. 电工技术学报, 2012, 27(12): 233-239. He Daqing, Cai Xu. Flatness-Based Control of VSC-HVDC. Transactions of China Electrotechnical Society, 2012, 27(12): 233-239.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I12/233

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