一种单相–三相混合微电网结构及其能量协调控制方法  

A Hybrid Single-phase/Three-phase Microgrid Structure and Its Energy Coordinated Control Method

作　　者：周小平[1] 陈燕东[1] 罗安[1] 周乐明[1] 李鸣慎 陈智勇[1] ZHOU Xiaoping CHEN Yandong LUO An ZHOU Leming LI Mingshen Chen Zhiyong(National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha 410082, Hunan Province, China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082

出　　处：《中国电机工程学报》2016年第24期6759-6768,共10页Proceedings of the CSEE

基　　金：国家自然科学基金重点项目(51237003);国家自然科学基金面上项目(51577056);湖南省博士生科研创新项目(CX2015B084)~~

摘　　要：由于分布式电源(distributed generation,DG)输出功率的间歇性和负荷的多变性,在传统单相三相混合微电网孤岛运行时易出现电压波动和三相功率不平衡现象。为此,该文提出一种单相-三相混合微电网结构及其能量协调控制方法,该结构主要包括功率共享单元(power sharing unit,PSU)、储能单元(energy storage unit,ESU)及单、三相微电网。针对PSU提出的基于下垂控制的能量协调控制方法,在三相功率不平衡时,协调混合微电网各相进行功率交换,从而抑制三相功率不平衡;在分布式电源出力或者负荷发生突变时,可快速提供有功和无功支撑,从而抑制混合微电网的电压波动。通过ESU稳定PSU直流侧的母线电压,实现对混合微电网能量波动的缓冲。仿真与实验结果都表明了所提方法的合理性和有效性。Due to the output power interrnittency of distributed generation （DG） and variability of loads, voltage fluctuation and three-phase power unbalance are easily occurred in traditional single-phase/three-phase hybrid microgrids operating in the islanded mode. A hybrid single-phase/ three-phase microgrid structure and its energy coordinated control method were proposed in this paper. The proposed structure was composed of power sharing units （PSU）, energy storage units （ESU）, single and three-phase microgrids. The energy coordinated control method based on droop control of PSU was proposed to coordinate power exchanges among three phases of hybrid microgrids so as to alleviate three-phase power unbalance. Besides, the PSU has ability to offer fast support for active and reactive power, so it can reduce the voltage fluctuation during power transient of DG or loads. The ESU was used to stabilize the dc-bus voltage of the PSU and to achieve the buffering of the power fluctuation in the hybrid microgrid. Simulation and experimental results indicate the rationality and effectiveness of the proposed method.

关 键 词：分布式电源 双向直流变换器 能量协调控制 下垂控制 单相-三相混合微电网 

分 类 号：TM76[电气工程—电力系统及自动化]