微电网的运行控制技术研究与应用

发布时间：2019-01-26 16:47

【摘要】：在当前环境保护和能源短缺的压力下,以太阳能、风能作为主要能源的分布式发电技术越来越受到重视。然而,由于以太阳能、风能为主的分布式发电的间歇性会对电网运行的稳定性造成很大影响,于是微电网作为促进分布式发电友好接入电网的一种技术手段被提出来用以解决这个问题。虽然近几年国内外学者对分布式发电和微电网领域进行了不少研究,但在能源管理、规划设计、多级微电网的协调控制和应用方面的相关问题尚未解决。因此有必要针对微电网的运行控制技术进行分析和研究。本文的主要内容包括:(1)根据某实际微电网系统的负荷构成及特性,结合光伏发电技术及多元储能技术,分别设计了光伏发电系统、多元复合储能系统、负荷控制系统的模型,为后面研究以光伏发电系统、多元复合储能系统、负荷控制系统为基础构建的混合交直流多级微电网系统提供了理论支持。(2)分别研究了交流子微电网和直流子微电网的控制策略,提出了一种基于分级自主控制技术的交直流混合多级微电网协调控制策略,实现了交直流混合多级微电网的安全稳定、经济高效运行。同时对多元复合储能系统的控制策略进行了研究,对整个微电网系统的供电可靠性和运行稳定性提供了保证。(3)针对不同运行控制需求,提出了一种含电动汽车充电桩的交直流混合多级微电网多时间尺度能量管理方法,有效的提高了微电网的投资回报率和能源利用效率,达到了交流微电网和直流微电网优势互补、多级微电网协调运行的目标。(4)构建了微电网系统的仿真模型,提出了考虑峰谷电价的储能运行控制策略,并对微电网的不同控制策略进行分时段实验。利用直流母线电压恒定控制策略,针对不同的运行工况,分别进行了直流电压稳定性实验。此外,分别对储能系统在并网模式和离网模式下的控制策略进行了仿真研究,研究结果表明,该微电网系统的运行控制策略安全稳定。
[Abstract]:Under the pressure of environmental protection and energy shortage, distributed power generation technology with solar and wind energy as the main energy has been paid more and more attention. However, the intermittent nature of distributed power generation, which is mainly solar and wind energy, has a great impact on the stability of the power grid. As a technical means to promote distributed generation, microgrid is proposed to solve this problem. Although scholars at home and abroad have done a lot of research in the field of distributed generation and microgrid in recent years, the related problems in energy management, planning and design, coordination control and application of multi-level microgrid have not been solved. Therefore, it is necessary to analyze and study the operation control technology of microgrid. The main contents of this paper are as follows: (1) according to the load composition and characteristics of a practical microgrid system, the photovoltaic power generation system and the multivariate composite energy storage system are designed, which are combined with the photovoltaic power generation technology and the multiple energy storage technology, respectively. The model of the load control system for the latter research is based on photovoltaic power generation system, multivariate composite energy storage system, The load control system provides theoretical support for the hybrid AC / DC multilevel microgrid system. (2) the control strategies of AC sub-microgrid and DC sub-microgrid are studied respectively. This paper presents a coordinated control strategy for AC / DC hybrid multilevel microgrid based on hierarchical autonomous control technology, which realizes the security and stability of AC / DC hybrid multilevel microgrid, and it is economical and efficient. At the same time, the control strategy of multi-element composite energy storage system is studied, which guarantees the power supply reliability and operation stability of the whole micro-grid system. (3) according to the different operation control requirements, In this paper, a multi-time scale energy management method for AC / DC hybrid multistage microgrid with electric vehicle charging piles is proposed, which can effectively improve the return on investment and energy utilization efficiency of microgrid. It achieves the goal of complementary advantages of AC microgrid and DC microgrid and coordinated operation of multi-level microgrid. (4) the simulation model of microgrid system is constructed, and the control strategy of energy storage operation considering peak and valley price is proposed. Experiments on different control strategies of microgrid are carried out in different time intervals. Using DC bus voltage constant control strategy, DC voltage stability experiments are carried out under different operating conditions. In addition, the control strategies of energy storage system in grid-connected mode and off-grid mode are simulated, and the results show that the operation control strategy of the micro-grid system is safe and stable.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM732

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