| 一种改进的分布式电源无功功率精确分配下垂控制策略 |
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| 引用本文： | 郭倩,林燎源,武宏彦,白志红,马皓.一种改进的分布式电源无功功率精确分配下垂控制策略[J].电力系统自动化,2015,39(15):30-34. |
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| 作者姓名： | 郭倩 林燎源 武宏彦 白志红 马皓 |
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| 作者单位： | 浙江大学电气工程学院,浙江省杭州市,310027 |
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| 基金项目： | 国家自然科学基金资助项目(51177149);高等学校博士学科点专项科研基金资助项目(20130101110108) |
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| 摘 要： | 由于独立运行的微网中馈线阻抗不匹配,采用传统下垂控制策略的分布式电源难以精确地分配输出功率。针对该问题,提出了一种改进的分布式电源无功功率精确分配下垂控制策略。在该策略中,中心控制器采用低带宽通信向各个分布式电源发送交流母线电压偏离补偿信号,分布式电源的本地控制器获取该补偿信号后,通过积分构造出输出电压的幅值参考。采用所提出的下垂控制策略,各分布式电源在实现无功功率精确分配的同时,可以有效消除交流母线的电压降,将母线电压恢复至额定值。仿真结果表明,所提出的改进下垂控制策略在复阻抗特性馈线微网中具有一定的有效性和可行性。
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| 关 键 词： | 微网(微电网) 下垂控制策略 无功功率分配 电压恢复 |
| 收稿时间： | 2014/9/22 0:00:00 |
| 修稿时间： | 2015/3/12 0:00:00 |
An Improved Droop Control Strategy for Accurate Reactive Power Sharing Among Distributed Generators |
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| GUO Qian,LIN Liaoyuan,WU Hongyan,BAI Zhihong and MA Hao.An Improved Droop Control Strategy for Accurate Reactive Power Sharing Among Distributed Generators[J].Automation of Electric Power Systems,2015,39(15):30-34. |
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| Authors: | GUO Qian LIN Liaoyuan WU Hongyan BAI Zhihong and MA Hao |
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| Affiliation: | College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China,College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China,College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China,College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China and College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Due to the mismatched feeders in an islanded microgrid, distributed generators (DGs) with conventional droop controller cannot share reactive power accurately. Aiming to solve this problem, an improved droop control strategy of accurate reactive power sharing is proposed. In the proposed scheme, the central controller sends the voltage deviation compensation signal to each DG via low bandwidth communication, and local controller of each DG integrates the signal to generate output voltage amplitude reference. Based on the proposed droop control strategy, each DG can realize accurate reactive power sharing and effectively eliminate voltage drop of AC bus. Hence, voltage restoration can also be realized in the microgrid. Simulation results indicate that the proposed droop control strategy is effective and feasible in the microgrid with complex impedance characteristics of feeders. This work is supported by National Natural Science Foundation of China (No. 51177149) and Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) of China (No. 20130101110108). |
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| Keywords: | microgrid droop control strategy reactive power sharing voltage restoration |
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