自治直流微电网分层控制策略

doi:10.3969/j.issn.1000－7229.2016.10.006

摘要/Abstract

摘要： 分布式控制策略由于可以与系统的监测体系相结合，有效解决了传统下垂控制方法所带来的电压跌落等问题。鉴于已有分布式控制策略在电压跌落补偿以及储能系统管理等方面的不足，该文采用新的分层控制策略来实现孤立直流微电网的可靠运行。该策略分为2层，第1层控制是就地控制，采用本地母线电压信号作为电力平衡指标来划分系统的运行模式；第2层控制是依靠通信的系统级控制，采用低带宽通信技术来实现母线电压的实时调节，并且根据蓄电池荷电状态（stage of charge，SOC）调节下垂控制参数以达到SOC均衡化的目的。通过MATLAB/simulink搭建了光储直流微电网模型，仿真结果验证了第1层控制可以不依靠通信连接来实现系统可靠运行，加入依靠通信的第2层控制后，能有效解决传统下垂控制所带来的电压跌落问题，并实现蓄电池SOC的均衡化。

关键词: 直流微电网, 分层控制, 电压调节, SOC均衡化

Abstract: The distributed control strategy with the supervision system has effectively solved the problem of voltage deviation brought by conventional droop control method. Considering the drawback of the previous distributed control strategy in voltage drop compensation and energy storage management, this paper proposes a novel hierarchical control strategy to achieve the reliable and optimal operation of stand-alone DC microgrid. The proposed control strategy includes two hierarchical layers. The primary control layer, which is the local control layer, uses bus voltage signal as an indicator of the power balance to change the operation modes of system. The secondary control layer is the system control layer based on communication links, which can achieve real-time bus voltage regulation by low-bandwidth communication technology, and adjust the drop control coefficient based on the battery state of charge (SOC) to balance the SOC between different batteries. This paper constructs the model for PV storage DC microgrid in MATLAB/simulink, whose simulation results verify that the primary control layer can ensure the reliable operation of the system without communication links, and after the addition of the second control layer with communication links, it can solve the problem of voltage deviation brought by conventional droop control method, and realize the balance of the SOC between different batteries.

Key words: DC microgrid, hierarchical control, voltage regulation, SOC balance

中图分类号:

TM 732

邱摇摇，杨秀，何虹历. 自治直流微电网分层控制策略[J]. 电力建设, 2016, 37(10): 41-.

QIU Yaoyao,YANG Xiu,HE Hongli. A Hierarchical Control Strategy of Autonomous DC Microgrid[J]. Electric Power Construction, 2016, 37(10): 41-.

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