Hybrid Microgrid With Parallel- and Series-Connected Microconverters
Hybrid Microgrid With Parallel- and Series-Connected Microconverters
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DOI：
10.1109/tpel.2017.2695659
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发表时间：
2018-06
影响因子：
6.7
通讯作者：
Jinwei He;Y. Li;Chengshan Wang;Yiwei Pan;Chenghui Zhang;Xiangyang Xing
中科院分区：
文献类型：
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作者：
Jinwei He;Y. Li;Chengshan Wang;Yiwei Pan;Chenghui Zhang;Xiangyang Xing
在本文中，提出了一种混合微电网与串联和并联连接的微变流器。用几个串联的低压微变换器构成一个具有额定输出电压幅值的串变换器。然后，串变换器的并联操作增加了微电网的额定功率和冗余。为实现微网并网和孤岛控制，同时兼顾功率分配，提出了一种同时控制公共耦合点（PCC）电压和微变流器电压的分级功率调节方法。首先，采用众所周知的下垂控制来获得PCC电压参考，用于并联串变换器之间的功率共享。其次，通过微转换器局部电压控制的功率平衡调节用于在串转换器中的串联连接的微转换器之间重新分配输出功率需求。由于所有微转换器测量的串转换器线电流是相同的，它被用来开发一种新的同步器，以仅用低带宽通信来互连串转换器中央控制器和微转换器本地控制器。由于串换流器中央控制和微换流器本地控制的协调，所提出的混合微电网可以运行在并网和孤岛模式下，每个微换流器具有真实的和无功功率共享。
In this paper, a hybrid microgrid with series- and parallel-connected microconverters is proposed. A few series-connected low voltage microconverters are used to build a string converter with rated output voltage magnitude. Then, the parallel operation of string converters increases the power rating and redundancy of the microgrid. To realize both grid-tied and islanding microgrid control with proper power sharing, a hierarchical power regulation method is developed with simultaneous point of common coupling (PCC) voltage and microconverter voltage control. First, the well-understood droop control is adopted to obtain PCC voltage reference for power sharing between parallel string converters. Second, a power balancing regulation through microconverter local voltage control is used to redistribute output power demand among series-connected microconverters in a string converter. As the string converter line current measured by all microconverters is the same, it is utilized to develop a novel synchronizer to interconnect the string converter central controller and the microconverter local controllers with only low bandwidth communications. Due to the coordination of string converter central control and microconverter local control, the proposed hybrid microgrid can operate in grid-tied and islanding modes with real and reactive power sharing for each microconverter.