复合储能在微网中的应用研究

微网是接纳分布式能源的有效方式之一，储能技术应用于微网可以改善电能质量、控制功率平衡、提高运行稳定性以及优化能量管理等。复合储能系统将功率型和能量型储能元件有机结合，兼具两类储能元件的优点，可以有效发挥储能技术在微网运行控制中的作用。从复合储能在微网中的应用模式、控制策略以及优化配置三个方面研究其在微网中的应用情况。首先根据储能元件在系统中连接方式的不同，分析集中式与分布式复合储能的应用模式和适用场合；然后基于储能单元改善微网运行特性的控制方法，分析复合储能系统中各储能元件的协调控制以提高系统动态响应特性和运行经济性；最后分析复合储能在微网中的优化配置问题，结合复合储能在微网中的运行控制提出其优化配置建议。

Application of Hybrid Energy Storage System in Micro-grid

Micro-grid is the effective way of accommodating distributed generation. Energy storage (ES) system in micro-grid can be contributed to the improvement of power quality, power balance control, operation stability enhancement and optimal energy management. A hybrid energy storage system (HESS) combines the high power density ES unit and the high energy density ES unit efficiently, and has the advantage of both type ES unit, which can be controlled effectively to improve the operation characteristic of micro-grid. In this paper, the application of the HESS in micro-grid was studied from aspects of application mode, control strategies and optimal allocation. Firstly, according to the different connection mode between the ES unit and the system bus, the application of the centralized HESS and the distributed HESS are analyzed. Secondly, based on the control method of ES to improve the operation of micro-grid, the coordination control of ES unit in HESS is summarized. Finally, the issue of optimal allocation of HESS in micro-grid is analyzed. Integrating with the coordination control of HESS, the suggestion for optimal allocation of HESS is proposed.