A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode
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孤岛模式下低压交直流混合微电网光伏发电与储能的协调控制

DOI:
10.3390/en9080651
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发表时间:
2016-08
期刊:
影响因子:
3.2
通讯作者:
Guerrero Josep M
Guerrero Josep M
中科院分区:
工程技术4区
文献类型:
--
作者:
Liu Yao;Hou Xiaochao;Wang Xiaofeng;Lin Chao;Guerrero Josep M

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可再生能源发电机的日益普及可能是一个重大挑战,因为它们的发电量波动。储能单元是提高供电质量和保证系统稳定性的一种解决方案。在本文中,一个混合微电网的基础上建立的光伏(PV)发电机和ES的协调控制,提出和发展,以实现功率管理的分散方式。该控制方案根据PV和ES的特点,包含三种不同的下垂策略。首先,提出了一种改进的光伏下垂控制方法,该方法既能充分利用可再生能源,又能避免频繁调节输出有功功率。其次,为了保持直流母线电压稳定,提出了一种新的直流侧电压下垂控制方法。第三,设计了交流侧ES的串级下垂控制。因此,ES寿命延长。此外,互连转换器(IC)在混合微电网中的AC/DC总线之间提供了桥梁。当AC或DC侧遭受有功功率需求不足时,IC的功率控制被启用。特别地,如果AC微电网不能满足无功功率需求,则IC充当静止同步补偿器(STATCOM)。仿真结果验证了所提策略的有效性。
The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC- or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.
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