采用背靠背变流器接入配电网改善低压微网电压质量的控制设计

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摘要为消除配网不对称运行引起的微网电压不平衡, 提出了一种采用背靠背变流器接入配网以改善低压微网电压质量的综合控制方案。基于二阶广义积分器推导αβ坐标系n次谐波瞬时正负序分量分解算法;电网侧变流器采用V/δ 控制维持直流母线电压恒定, 电压外环引入虚拟电抗以提高低压阻性线路的调节性能, 根据不平衡电压条件下变流器输出功率波动特性, 增加内环负序电流补偿减小配网不对称运行时直流电压的倍频波动;微网侧变流器采用电压外环电流内环双闭环定V/f控制, 加入负序和三次谐波电压控制环节有效消除了微网公共连接点的电压不平衡。采用PSCAD/EMTDC仿真验证了本文所提控制方案的正确性和有效性。

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	王强钢
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	杜跃明
	夏刚

关键词 ：微网, 电压质量, 不对称运行, 背靠背变流器

Abstract：A control scheme for improvement of voltage quality in low voltage microgrid using back-to-back converter to eliminate the unbalanced voltage disturbance under distribution network unsymmetrical operation is proposed. The instantaneous positive and negative sequence nth harmonic decomposition algorithm in αβ frame based on the second-order generalized integrator was derived. The grid side converter adopts the V/δ control to maintain DC voltage and added the virtual inductor to outer voltage loop to improve the control performance in the low-voltage line with mainly resistive line impedance. According to the power characteristic of voltage source converter on distribution grid unsymmetrical operation, the negative sequence current compensation in inner current loop is developed in grid side converter to mitigate DC voltage fluctuations. The double closed-loop constant V/f control is implemented in the microgrid side converter and the PCC unbalanced voltage is eliminated by the negative sequence and third harmonic voltage control loop in it. Simulation results in PSCAD/EMTDC software show the correctness and effectiveness of the proposed control scheme.

Key words： Microgrid voltage quality unbalanced operation back-to-back converter

收稿日期: 2012-03-19 出版日期: 2014-03-25

PACS:	TM761
	TM727
	TM61

基金资助:国家自然科学基金(51277184)和输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA 10512711209)资助。

作者简介: 王强钢男, 1987年生, 博士研究生, 研究方向为电力系统自动化和电能质量。周念成男, 1969年生, 博士, 副教授, 研究方向为电力系统自动化和电能质量。

引用本文:

王强钢, 周念成, 颜伟, 寿挺, 杜跃明, 夏刚. 采用背靠背变流器接入配电网改善低压微网电压质量的控制设计[J]. 电工技术学报, 2013, 28(4): 171-181. Wang Qianggang, Zhou Niancheng, Yan Wei, Shou Ting, Du Yueming, Xia Gang. Control Design for Voltage Quality Improvement of Low Voltage Microgrid Using Back-to-Back Converter Connected to Distribution Network. Transactions of China Electrotechnical Society, 2013, 28(4): 171-181.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I4/171

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