风光储微电网孤岛运行协调控制策略研究
发布时间：2018-11-06 13:45
【摘要】：微电网是分布式电源接入电网的有效手段,它能够充分利用分布式能源,提高电力系统供电可靠性,更好地满足电力用户用电需求,已经成为国内外相关领域的研究重点。本文针对风光储微电网,研究孤岛运行模式下的协调控制策略,以实现微电网的优化及可靠运行,并通过仿真研究验证该协调控制策略的可行性。论文首先介绍了课题研究的背景及意义,简述了国内外微电网研究现状,综述了微电网控制技术发展现状。其次,概述了风光储微电网的组成原理,并根据资源及用户负荷情况进行了系统风光储容量设计。论述了风力发电子系统、光伏发电子系统及储能子系统的工作原理和特性,介绍了系统拓扑中的AC/DC、DC/DC及DC/AC变换技术,并对电感和电容等主要参数进行了设计。再次,基于孤岛运行控制的基本思想,分析了微电网中风机、光伏阵列、蓄电池及负荷之间的能量流动关系,根据风速、光照、蓄电池工作状态及负荷需求的变化,给出了微电网系统的工作模式,并确定了孤岛运行协调控制策略。风光储微电网中不同子系统根据工作状态采用不同的控制策略,风力发电子系统采用最大功率跟踪和PQ控制策略;光伏发电子系统采用最大功率跟踪、负载功率跟踪和PQ控制策略;针对储能子系统给出了充放电控制策略和基于下垂控制的V/f控制策略;对一些非关键性负荷设计了负荷自动投切控制策略。最后,在Simulink中搭建风光储微电网系统整体仿真模型,并在蓄电池不同荷电态下进行仿真。仿真结果表明,储能子系统能够保证微电网系统功率平衡,维持交流母线电压和频率的稳定,在风速、光照、蓄电池工作状态及负荷需求变化的情况下,风力发电子系统和光伏发电子系统都能够在各自合理的工作模式下进行工作,负荷也能够自动投切到系统中,实现了微电网的安全稳定运行,从而验证了本文所论协调控制策略的可行性和正确性。
[Abstract]:Microgrid is an effective means for distributed generation to connect to power grid. It can make full use of distributed energy, improve the reliability of power supply, and better meet the demand of power users, which has become the focus of research in related fields at home and abroad. In order to realize the optimization and reliable operation of the microgrid, the coordinated control strategy under the isolated island operation mode is studied in this paper, and the feasibility of the coordinated control strategy is verified by simulation research. Firstly, this paper introduces the background and significance of the research, describes the current situation of microgrid research at home and abroad, and summarizes the development of microgrid control technology. Secondly, the composing principle of the wind-energy micro-grid is summarized, and the system wind-storage capacity is designed according to the resource and user load. The working principle and characteristics of wind power subsystem, photovoltaic subsystem and energy storage subsystem are discussed. The AC/DC,DC/DC and DC/AC transformation techniques in the system topology are introduced, and the main parameters such as inductance and capacitance are designed. Thirdly, based on the basic idea of islanding operation control, the energy flow relationship between fan, photovoltaic array, battery and load in microgrid is analyzed, according to the changes of wind speed, illumination, battery working state and load demand. The operation mode of microgrid system is given, and the coordinated control strategy of isolated island operation is determined. Different subsystems adopt different control strategies according to the working state, and the wind power subsystem adopts maximum power tracking and PQ control strategy. The photovoltaic subsystem adopts maximum power tracking, load power tracking and PQ control strategy, and gives charge and discharge control strategy and V / F control strategy based on droop control for energy storage subsystem. A load automatic switching control strategy is designed for some non-critical loads. Finally, the whole simulation model of the solar microgrid system is built in Simulink, and the simulation is carried out under different charging states of the battery. The simulation results show that the energy storage subsystem can ensure the power balance of the microgrid system and maintain the stability of the voltage and frequency of the AC bus. Under the condition of the changes of wind speed, illumination, battery working state and load demand, the simulation results show that the energy storage subsystem can maintain the stability of AC bus voltage and frequency. The wind power subsystem and photovoltaic subsystem can work in their respective reasonable working mode, and the load can be automatically switched to the system, which realizes the safe and stable operation of the microgrid. The feasibility and correctness of the coordinated control strategy discussed in this paper are verified.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727
本文编号：2314451
[Abstract]:Microgrid is an effective means for distributed generation to connect to power grid. It can make full use of distributed energy, improve the reliability of power supply, and better meet the demand of power users, which has become the focus of research in related fields at home and abroad. In order to realize the optimization and reliable operation of the microgrid, the coordinated control strategy under the isolated island operation mode is studied in this paper, and the feasibility of the coordinated control strategy is verified by simulation research. Firstly, this paper introduces the background and significance of the research, describes the current situation of microgrid research at home and abroad, and summarizes the development of microgrid control technology. Secondly, the composing principle of the wind-energy micro-grid is summarized, and the system wind-storage capacity is designed according to the resource and user load. The working principle and characteristics of wind power subsystem, photovoltaic subsystem and energy storage subsystem are discussed. The AC/DC,DC/DC and DC/AC transformation techniques in the system topology are introduced, and the main parameters such as inductance and capacitance are designed. Thirdly, based on the basic idea of islanding operation control, the energy flow relationship between fan, photovoltaic array, battery and load in microgrid is analyzed, according to the changes of wind speed, illumination, battery working state and load demand. The operation mode of microgrid system is given, and the coordinated control strategy of isolated island operation is determined. Different subsystems adopt different control strategies according to the working state, and the wind power subsystem adopts maximum power tracking and PQ control strategy. The photovoltaic subsystem adopts maximum power tracking, load power tracking and PQ control strategy, and gives charge and discharge control strategy and V / F control strategy based on droop control for energy storage subsystem. A load automatic switching control strategy is designed for some non-critical loads. Finally, the whole simulation model of the solar microgrid system is built in Simulink, and the simulation is carried out under different charging states of the battery. The simulation results show that the energy storage subsystem can ensure the power balance of the microgrid system and maintain the stability of the voltage and frequency of the AC bus. Under the condition of the changes of wind speed, illumination, battery working state and load demand, the simulation results show that the energy storage subsystem can maintain the stability of AC bus voltage and frequency. The wind power subsystem and photovoltaic subsystem can work in their respective reasonable working mode, and the load can be automatically switched to the system, which realizes the safe and stable operation of the microgrid. The feasibility and correctness of the coordinated control strategy discussed in this paper are verified.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727
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