微网稳定运行与模式平滑切换综合控制策略

doi:10.19595/j.cnki.1000-6753.tces.170866

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摘要提出一种基于下垂控制的微电网稳定运行与模式平滑切换综合控制策略。经理论分析和仿真得到结论：①所设计LCL-VSC型微源闭环解耦控制系统,由于包含全部LCL滤波参数,高频谐波抑制能力较强;②所提基于自适应功率补偿的无功-电压和有功-频率稳定控制策略,能够有效抑制微网孤岛模式下负载对系统电压、频率的扰动;③所提微网运行模式平滑切换控制策略,可实现模式切换时电压、频率和功率的平滑过渡。所提并网相位同步控制方法,由于融入了大电网电压锁相控制功能,取消了电网电压锁相环,并且,采取的相位调节方法消除了传统频率调节法对频率下垂控制的影响;所提离网功率同步控制方法,实现了离网瞬间微网输出功率与负载功率的同步,在稳定微网电压和频率的同时,确保电力开关的零负荷分断。

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关键词 ：微电网, 下垂控制, 自适应功率补偿, 稳定控制, 模式平滑切换

Abstract：An integrated control strategy of the stabilization operation and mode smooth transfer for a microgrid based on the conventional droop control method is proposed in this paper. The theoretical analysis and simulation results show that: ①Due to the inclusion of all LCL filter parameters, the designed closed-loop decoupled control system of an LCL-VSC based micro-source has strong high-frequency harmonic suppression ability. ②The new P-f and Q-U stabilization control means based on an adaptive power compensation strategy can inhibit the load perturbations on the voltage and frequency of the islanded microgrid effectively. ③The introduced mode transfer control strategy can achieve the smooth transition of voltage, frequency and power. By the novel phase synchronization control approach, the impact of the traditional frequency adjustment means on the P-f droop control is eliminated using a direct phase adjustment method. Moreover, the voltage phase- locked loop for the main power grid is removed. In addition, the novel off-grid power synchronization control method realizes the power synchronization for microgrids and loads, which stabilizes the voltage and frequency while ensuring the zero-load breaking of the power switch.

Key words： Microgrid droop control adaptive power compensation stabilization control operation mode smooth transfer

收稿日期: 2017-06-19 出版日期: 2018-09-03

PACS:

TM72

基金资助:江苏省“333工程”科研项目（BRA2016184）,江苏省产学研前瞻性联合研究项目（BY2016076-14）和国家自然科学基金（51607037）资助

通讯作者: 许胜男,1976年生,博士后,副教授,研究方向为电能质量控制技术、微网变流器控制技术等。E-mail: xush_00@sina.com

作者简介: 曹武男,1984年生,博士,讲师,研究方向为电能质量控制技术、低压大电流有源滤波技术。E-mail: caowu_ee@seu.edu.cn

引用本文:

许胜, 曹武, 赵剑锋. 微网稳定运行与模式平滑切换综合控制策略[J]. 电工技术学报, 2018, 33(16): 3855-3867. Xu Sheng, Cao Wu, Zhao Jianfeng. An Integrated Control Strategy of the Stabilization Operation and Mode Smooth Transfer for Microgrids. Transactions of China Electrotechnical Society, 2018, 33(16): 3855-3867.

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