用于微网系统的储能变流器研究

发布时间：2018-10-08 14:16

【摘要】：随着越来越多的分布式发电得到应用,分布式发电的引入对主电网带来的一些不利影响也受到人们越来越广泛的关注。为了解决分布式电源与主电网之间的矛盾提出了微电网的概念。由分布式电源、储能装置、监控系统和保护装置等组成的微网能够实现自我控制、保护和管理,已受到全世界广泛的关注。储能技术对于微网的安全稳定运行起到至关重要的作用,储能系统可以平抑微网的功率波动,孤网运行时稳定母线电压,并且能够提供无功补偿,提高微网的电能质量。电池储能由于技术成熟、可靠性高、成本较低,得到广泛的应用,本文研究的是作为电网与电池之间连接接口的储能变流器,研究了储能变流器的主电路参数设计及不同工况下的控制策略,通过仿真和实验的方法进行了验证。首先,在分析了储能变流器的不同系统结构类型的优缺点的基础上选择了储能变流器拓扑,分别叙述了储能变流器中DC/DC变换器和DC/AC变流器的工作原理及控制方法,完成了储能变流器的主要硬件参数设计。其次,研究了储能技术在风光储互补微网中的主要应用,从功率平滑、削峰填谷、离网运行三个方面着手设计了储能变流器的控制策略,分为并网模式下的DC/DC恒流控制、DC/DC下垂控制,离网模式下的DC/AC双闭环控制、DC/AC下垂控制。利用Matlab软件对储能变流器控制策略进行仿真,验证了依靠所制定的控制策略能够实现储能系统在微网中的主要功能。最后,通过对储能变流器功能性实验和现场的微网系统功能实验的波形分析,验证了本文设计的储能变流器硬件结构及控制策略可以实现设定的功能,表明了设计方案的可行性。
[Abstract]:With more and more applications of distributed generation, people pay more and more attention to the adverse effects of the introduction of distributed generation on the main grid. In order to solve the contradiction between distributed generation and main grid, the concept of microgrid is proposed. The micro-network composed of distributed power supply, energy storage device, monitoring system and protection device can realize self-control, protection and management, which has been paid more and more attention all over the world. The energy storage technology plays an important role in the safe and stable operation of the microgrid. The energy storage system can stabilize the power fluctuation of the microgrid, stabilize the bus voltage during the operation of the isolated grid, provide reactive power compensation, and improve the power quality of the microgrid. Battery energy storage is widely used because of its mature technology, high reliability and low cost. The design of the main circuit parameters and the control strategy under different working conditions are studied and verified by simulation and experiment. Firstly, on the basis of analyzing the merits and demerits of different system structure types of the energy storage converter, the topology of the energy storage converter is selected. The working principle and control method of the DC/DC converter and the DC/AC converter in the energy storage converter are described respectively. The main hardware parameters of the energy storage converter are designed. Secondly, the main application of energy storage technology in the complementary microgrid of wind and storage is studied. The control strategy of the energy storage converter is designed from three aspects: power smoothing, peak cutting and valley filling, and off-grid operation. It is divided into DC/DC constant current control and DC / DC droop control in grid-connected mode and DC/AC double closed loop control in off-grid mode. The control strategy of the energy storage converter is simulated by Matlab software, and it is verified that the main functions of the energy storage system in the microgrid can be realized by the proposed control strategy. Finally, through the waveform analysis of the energy storage converter functional experiment and the field microgrid system function experiment, it is verified that the hardware structure and control strategy of the energy storage converter designed in this paper can achieve the set function. The feasibility of the design is demonstrated.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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