| 引用本文: | 罗龙,李耀华,李子欣,赵聪.基于范德波尔振荡器和PQ控制的微电网并离网协调控制策略[J].电力自动化设备,2023,43(1): |
| LUO Long,LI Yaohua,LI Zixin,ZHAO Cong.On-grid and off-grid coordinated control strategy of microgrid based on Van der Pol oscillator and PQ control[J].Electric Power Automation Equipment,2023,43(1): |
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| 摘要: |
| 针对微电网中采用传统多层嵌套的并离网下垂控制系统存在动态响应速度较慢、均流性能较差等问题，提出了一种基于范德波尔虚拟振荡器控制器(VOC)和PQ控制的微电网并离网协调控制方法。在微电网并网运行时，通过对离网VOC引入并网电流反馈，并对其谐振参数和电压倍率进行闭环调节，使VOC一直处于热备用状态，不仅使微电网中各发电单元拥有PQ控制的良好动态性能，还可实现并离网的平滑切换。在微电网转孤岛运行后，同样对VOC参数进行闭环调节，实现对微电网中公共耦合点(PCC)处负载电压的补偿以及对各发电单元更好的均流控制。给出VOC参数同步控制器与PCC处电压之间的关系，理论分析实现同步的机理。与基于传统下垂控制的并离网控制策略进行仿真对比，结果表明所提控制策略可以有效改善微电网在并网运行时的动态响应和孤岛运行时的均流性能。 |
| 关键词: 微电网 虚拟振荡器 并离网控制 PQ控制 协调控制 |
| DOI：10.16081/j.epae.202204068 |
| 分类号:TM761 |
| 基金项目:中国科学院战略性先导科技专项资助项目(XDA21050302) |
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| On-grid and off-grid coordinated control strategy of microgrid based on Van der Pol oscillator and PQ control |
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LUO Long1,2, LI Yaohua1,2, LI Zixin1,2, ZHAO Cong1,2
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1.Key Laboratory of Power Electronics and Electric Drive(Institute of Electrical Engineering of Chinese Academy of Sciences),Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| In order to solve the problems of slow dynamic response and poor current-sharing performance of the traditional multi-layer nested on-grid and off-grid droop control system in microgrid, an on-grid and off-grid coordinated control strategy of microgrid based on Van der Pol virtual oscillator controller(VOC) and PQ control is proposed. When the microgrid is on-grid, the off-grid VOC is introduced with grid-connected current feedback, and its resonance parameters and voltage ratio are closed loop adjusted, so that the VOC is always in the hot standby state, which not only enables each power generation unit in the microgrid have good dynamic performance of PQ control, but also realizes smooth switching between on-grid mode and off-grid mode. After the microgrid turns to off-grid operation, VOC parameters are also closed loop adjusted, so as to realize the load voltage compensation at the point of common coupling(PCC) in the microgrid and better current-sharing control for each power generation unit. The relationship between the synchronization controller of VOC parameters and PCC voltage is given, and the synchronization mechanism is analyzed theoretically. The simulative results show that the proposed control strategy can effectively improve the dynamic response in on-grid operation and current-sharing performance in off-gird operation of the microgrid, compared with the traditional droop control-based on-grid and off-grid coordinated control strategy. |
| Key words: microgrid virtual oscillator on-grid and off-grid control PQ control coordinated control |
