基于大规模储能系统的交流微电网协调控制策略研究

发布时间：2018-01-23 04:01

本文关键词： 风光发电系统大规模储能系统分层控制下垂控制荷电状态　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：能源危机和环境污染已经引起了世界各国的广泛关注,大力开发和利用可再生能源进行并网发电是解决上述问题的有效措施之一。风光发电系统的输出功率具有随机性和间歇性的特点,为了提升系统的整体运行性能和可靠性,通常在风光发电系统中配置大规模储能系统。本文着重针对大规模储能系统的协调控制策略进行了研究,论文的主要工作如下:1、建立了风光发电系统以及大规模蓄电池的数学模型,研究了风力发电机和光伏-电池的工作特性,分析了风光发电系统的最大功率跟踪控制的基本原理,设计了风光发电系统接口变换器的控制框图。最后,对风速变化、光照强度变化以及温度变化进行了MPPT仿真研究。2、提出了一种基于电力负荷峰谷变化的大规模储能系统参与风光发电系统的二层协调控制,根据电力负荷状态划分了三种工作模式,给出了储能单元的底层控制策略和系统的上层控制策略,对所提出的二层协调控制方法进行了仿真研究,所提出的研究方法能够根据储能自身状态在优先满足本地负载的情况下,实现削峰填谷的功能。3、针对传统下垂控制未考虑不同蓄电池荷电状态和安全运行范围的不足,提出了一种基于SOC功率分配的有效安全运行范围内的储能系统控制策略。根据电池荷电状态划分了三种运行模式,给出了改进下垂控制的基本原理和变下垂因子的获取方法,并对改进下垂控制方法进行了仿真研究,仿真结果表明该方法能够有效避免蓄电池进入过度充电和放电区域,提升了系统可靠性。
[Abstract]:Energy crisis and environmental pollution have attracted the attention of many countries all over the world. One of the effective measures to solve the above problems is to develop and utilize renewable energy to generate electricity grid. The output power of wind power generation system has the characteristics of randomness and intermittence. In order to improve the overall performance and reliability of the system, the large-scale energy storage system is usually configured in the wind power generation system. The coordinated control strategy of the large-scale energy storage system is studied in this paper. The main work of this paper is as follows: 1. The mathematical models of wind power generation system and large-scale battery are established, and the working characteristics of wind turbine and photovoltaic cell are studied. The basic principle of maximum power tracking control for wind power generation system is analyzed, and the control block diagram of interface converter for wind power generation system is designed. Finally, the variation of wind speed is discussed. The change of illumination intensity and temperature are studied by MPPT simulation. 2. A large-scale energy storage system based on the change of peak and valley power load is proposed to participate in the two-layer coordinated control of wind-generation system. According to the power load state, the paper divides three working modes, gives the bottom control strategy of the energy storage unit and the upper control strategy of the system, and simulates the proposed two-layer coordinated control method. The proposed research method can realize the function of cutting peak and filling valley according to the state of energy storage under the condition that the local load is satisfied first. The traditional droop control does not consider the shortcomings of different battery charging states and safe operation range. In this paper, a control strategy of energy storage system based on SOC power allocation is proposed, and three operation modes are divided according to the charging state of the battery. The basic principle of improved droop control and the method of obtaining variable sag factor are given, and the simulation of the improved droop control method is carried out. The simulation results show that the proposed method can effectively avoid the storage battery from overcharging and discharging areas and improve the reliability of the system.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732;TM61

【参考文献】