光伏微网储能变流系统下垂控制方法研究
发布时间：2019-01-04 13:34
【摘要】：随着绿色能源技术的不断发展,全球能源消耗和环境污染问题找到了解决的办法。将太阳能量储存起来运行可以提高微电网运行的供电时间,大电网发生电力故障时可以保持电能供应,用户不再受到电源间歇性供能的影响,微电网有着将可再生能源集约化利用的优点。对储能变流系统的控制策略进行研究,可以使人们充分利用可再生能源,在维持系统稳定运行和确保用户使用到的电能质量都达标都有着很多好处。同时微电网也存在着如能量间歇性问题,功率不稳定问题和状态切换时电压有波动等缺点。因此实现微网中储能系统的有效控制,使系统中各个环节相互配合,实现微网系统平稳的运行和各状态的平滑切换,成为急需研究的问题。论文首先介绍微网系统的研究背景,指出微网在中国发展的实际意义,阐述当今微网系统的研究价值和意义,对储能系统中的PCS和储能设备基本研究现状加以说明。本文基于我校光伏微网项目,主要进行了光伏微网储能变流系统控制方法的研究,并在Matlab/Simulink上完成建模和仿真实验。其次,通过对储能变流系统的研究,介绍了 PCS的拓扑结构,以及储能变流器的主要功能。根据双向变流器的工作特性,选取了三相电压型整流电路拓扑,同时,对几种常见的非隔离型和隔离型DC-DC电路拓扑进行比较,分析了其电路的优点和缺点。然后根据PCS主电路中各物理量的定义,建立了 PCS交流侧和直流侧同步坐标系的数学模型。再次,研究了双向储能变流器的控制策略,对PQ、V/f、Droop三种典型运行控制策略进行研究。本文将基于摄动协同矩阵的优化算法引入到下垂控制算法中,通过对下垂系数的优化,将此算法用在储能变流控制系统中,并在Matlab/Simulink搭建仿真模型,通过对仿真结果的分析,得出该控制算法有效的保证了微网系统的功率平衡,频率和电压的稳定。实现了微网在离并网状态中储能变流系统稳定运行的控制、功率稳定及平滑切换。最后,对本文进行总结和展望。文章中建立的储能变流系统基于下垂控制算法下,引入摄动矩阵优化算法,实现了对微网系统离网和并网运行的平滑切换,保持了微网运行的稳定性。
[Abstract]:With the development of green energy technology, global energy consumption and environmental pollution problems have been solved. Storing solar energy up and running can increase the power supply time of the microgrid, keep the power supply in the event of power failure in large power grid, so that the user is no longer affected by the intermittent energy supply of the power supply. Microgrid has the advantage of intensive utilization of renewable energy. The research on the control strategy of the energy storage converter system can make people make full use of renewable energy, which has many advantages in maintaining the stable operation of the system and ensuring that the power quality of the users is up to standard. At the same time, microgrid also has some disadvantages, such as energy intermittency, power instability and voltage fluctuation during state switching. Therefore, to realize the effective control of the energy storage system in the microgrid, to make the various links of the system cooperate with each other, to realize the smooth operation of the micro-grid system and the smooth switching of each state, has become a problem that needs to be studied urgently. This paper first introduces the research background of microgrid system, points out the practical significance of the development of microgrid in China, expounds the research value and significance of microgrid system, and explains the basic research status of PCS and energy storage equipment in energy storage system. Based on the photovoltaic microgrid project of our school, this paper mainly studies the control method of the PV microgrid energy storage converter system, and completes the modeling and simulation experiments on Matlab/Simulink. Secondly, the topological structure of PCS and the main functions of the energy storage converter are introduced through the research of the energy storage converter system. According to the working characteristics of the bidirectional converter, the three-phase voltage source rectifier circuit topology is selected. At the same time, several common non-isolated and isolated DC-DC circuit topologies are compared, and the advantages and disadvantages of the circuit are analyzed. Then, according to the definition of each physical quantity in PCS main circuit, the mathematical model of synchronous coordinate system of PCS AC side and DC side is established. Thirdly, the control strategy of bidirectional energy storage converter is studied, and three typical operation control strategies of PQ,V/f,Droop are studied. In this paper, the optimization algorithm based on perturbation cooperative matrix is introduced into the droop control algorithm. By optimizing the sag coefficient, the algorithm is used in the energy storage converter control system, and the simulation model is built in Matlab/Simulink, and the simulation results are analyzed. It is concluded that the control algorithm can effectively ensure the power balance, frequency and voltage stability of the microgrid system. The stable operation control, power stability and smooth switching of the energy storage converter system in the off-grid state of the microgrid are realized. Finally, this paper is summarized and prospected. Based on the droop control algorithm, a perturbation matrix optimization algorithm is introduced to realize the smooth switching between off-grid and grid-connected operation of the micro-grid system, and the stability of the micro-grid operation is maintained.
【学位授予单位】：安徽工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727;TM46
本文编号：2400358
[Abstract]:With the development of green energy technology, global energy consumption and environmental pollution problems have been solved. Storing solar energy up and running can increase the power supply time of the microgrid, keep the power supply in the event of power failure in large power grid, so that the user is no longer affected by the intermittent energy supply of the power supply. Microgrid has the advantage of intensive utilization of renewable energy. The research on the control strategy of the energy storage converter system can make people make full use of renewable energy, which has many advantages in maintaining the stable operation of the system and ensuring that the power quality of the users is up to standard. At the same time, microgrid also has some disadvantages, such as energy intermittency, power instability and voltage fluctuation during state switching. Therefore, to realize the effective control of the energy storage system in the microgrid, to make the various links of the system cooperate with each other, to realize the smooth operation of the micro-grid system and the smooth switching of each state, has become a problem that needs to be studied urgently. This paper first introduces the research background of microgrid system, points out the practical significance of the development of microgrid in China, expounds the research value and significance of microgrid system, and explains the basic research status of PCS and energy storage equipment in energy storage system. Based on the photovoltaic microgrid project of our school, this paper mainly studies the control method of the PV microgrid energy storage converter system, and completes the modeling and simulation experiments on Matlab/Simulink. Secondly, the topological structure of PCS and the main functions of the energy storage converter are introduced through the research of the energy storage converter system. According to the working characteristics of the bidirectional converter, the three-phase voltage source rectifier circuit topology is selected. At the same time, several common non-isolated and isolated DC-DC circuit topologies are compared, and the advantages and disadvantages of the circuit are analyzed. Then, according to the definition of each physical quantity in PCS main circuit, the mathematical model of synchronous coordinate system of PCS AC side and DC side is established. Thirdly, the control strategy of bidirectional energy storage converter is studied, and three typical operation control strategies of PQ,V/f,Droop are studied. In this paper, the optimization algorithm based on perturbation cooperative matrix is introduced into the droop control algorithm. By optimizing the sag coefficient, the algorithm is used in the energy storage converter control system, and the simulation model is built in Matlab/Simulink, and the simulation results are analyzed. It is concluded that the control algorithm can effectively ensure the power balance, frequency and voltage stability of the microgrid system. The stable operation control, power stability and smooth switching of the energy storage converter system in the off-grid state of the microgrid are realized. Finally, this paper is summarized and prospected. Based on the droop control algorithm, a perturbation matrix optimization algorithm is introduced to realize the smooth switching between off-grid and grid-connected operation of the micro-grid system, and the stability of the micro-grid operation is maintained.
【学位授予单位】：安徽工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727;TM46
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