| 引用本文: | 曾 浩,赵恩盛,周思宇,等.基于电流一致性的直流微网自适应下垂控制[J].电力系统保护与控制,2022,50(12):12-21.[点击复制] |
| ZENG Hao,HAO Ensheng,ZHOU Siyu,et al.Adaptive droop control of a DC microgrid based on current consistency[J].Power System Protection and Control,2022,50(12):12-21[点击复制] |
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| 摘要: |
| 在直流微电网中，传统下垂控制存在功率均分和母线电压控制不能同时兼顾的矛盾。针对这一问题，研究了带阻性负载直流微网系统，提出基于电流一致性的直流微网自适应下垂控制策略。该策略包括一次、二次和电流一致性控制。引入输出电容电压反馈构成一次控制，参考电压补偿和下垂系数修正构成二次控制。各分布式电源间仅相邻变换器交换电流信息，通过电流一致性迭代控制和一次、二次控制结合，在保障输出功率均分的同时，消除了直流母线电压偏差。为验证该策略的控制有效性，对系统进行小信号建模理论分析，分析控制参数变化对系统稳定性的影响，最后进行了仿真验证。理论分析与仿真结果表明，该控制策略在微网结构改变时，也能保证系统稳定，自适应完成直流微网功率均分和母线电压控制目标。 |
| 关键词: 直流微网 电流一致性 自适应下垂控制 母线电压控制 功率均分 |
| DOI：DOI: 10.19783/j.cnki.pspc.211404 |
| 投稿时间：2021-10-19修订日期：2022-02-07 |
| 基金项目:国家自然科学基金项目资助(51977026)；四川省科技计划资助(2021YFG0255) |
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| Adaptive droop control of a DC microgrid based on current consistency |
| ZENG Hao,HAO Ensheng,ZHOU Siyu,HAN Yang,YANG Ping,WANG Congling |
| (School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China,
Chengdu 611731, China) |
| Abstract: |
| In a DC microgrid, conventional droop control has the contradiction that power sharing and bus voltage control cannot be considered at the same time. To solve this problem, a system with resistive load is studied, and adaptive droop control of the DC microgrid based on current consistency strategy is proposed. The strategy includes primary, secondary and current consistency control. The introduction of output capacitor voltage feedback constitutes the primary control, and reference voltage compensation and droop coefficient correction constitute the secondary control. Each distributed power supply only exchanges current information between adjacent converters. Through the iterative control of current consistency and the combination of primary and secondary control, the bus voltage deviation is eliminated while ensuring the output power is evenly divided. In order to verify the control effectiveness of the strategy, small-signal modeling theory of the system is analyzed, and the influence of the change of control parameters on the stability of the system is analyzed. Finally, simulation verification is carried out. Theoretical analysis and simulation results show that the proposed control strategy can also ensure the stability of the system when the structure of DC microgrid changes, and achieve the goal of power sharing and bus voltage control adaptively.
This work is supported by the National Natural Science Foundation of China (No. 51977026). |
| Key words: DC microgrid current consistency adaptive droop control bus voltage control power sharing |
