含燃气轮机的直流微电网建模与控制研究

发布时间：2018-03-11 22:16

本文选题：分布式发电　切入点：直流微电网　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着分布式发电技术的快速发展,有效利用新能源是现代社会发展的需要,因此有学者提出微电网的理念,直流微电网以更为高效、节能和低成本的供电方式,将有力推动直流配电网、直流输电技术的发展,对分布式发电技术的应用和电网的智能化具有深远意义。为了分析直流微电网的运行特性、研究其控制方式,在直流微电网的实际工程建设之前,需要学者们利用不同仿真软件对其进行建模仿真,分析不同情况下直流微电网的运行状态,完善各类直流微电网的控制策略,为直流微电网的工程应用打下坚实的理论基础。论文对直流微电网的仿真模型进行了建模分析,首先建立光伏电池的数学模型,并对光伏发电系统的MPPT控制和恒压控制进行分析;其次建立直驱永磁风机的数学模型,分析其最优叶尖速比控制;然后对微型燃气轮机的数学模型进行分析,分析其PWM恒压控制控制;最后建立储能装置的数学模型,对其充放电的控制进行研究。分析直流微电网运行控制的理论,介绍分层控制理论和基于DBS的控制策略;对双向AC-DC变流器的控制进行设计,在此基础上提出一种改进的并网运行下垂控制策略;提出一种孤岛运行下的直流微电网分层控制策略,采用两层控制理论,分别对设备控制层与直流母线控制层进行了研究设计。对论文所建直流微电网仿真模型以及控制策略进行了仿真分析。仿真分析直流微电网并网运行时,双向AC-DC变流器处于不同工作模式的下运行状况,仿真结果表明论文提出的改进下垂控制策略能够很好的完成直流微电网并网运行时的控制;仿真分析直流微电网孤岛运行时的5种运行模式,仿真结果表明论文提出的分层控制策略能够实现直流微电网孤岛运行的协调控制与各运行状态的平稳切换。
[Abstract]:With the rapid development of distributed generation technology, the effective use of new energy is the need of the development of modern society. Therefore, some scholars put forward the concept of micro-grid, DC micro-grid with more efficient, energy-saving and low-cost power supply. The development of DC distribution network and HVDC transmission technology will have far-reaching significance for the application of distributed generation technology and intelligent power grid. In order to analyze the operation characteristics of DC microgrid, the control mode of DC microgrid is studied. Before the actual construction of DC microgrid, it is necessary for scholars to use different simulation software to model and simulate it, analyze the operation state of DC microgrid under different conditions, and perfect the control strategy of all kinds of DC microgrid. In this paper, the simulation model of DC microgrid is modeled and analyzed. Firstly, the mathematical model of photovoltaic cell is established. The MPPT control and constant pressure control of photovoltaic power generation system are analyzed. Secondly, the mathematical model of direct-drive permanent magnet fan is established to analyze the optimal blade tip speed ratio control, and then the mathematical model of micro gas turbine is analyzed. The PWM constant voltage control is analyzed, the mathematical model of the energy storage device is established, the control of charge and discharge is studied, the theory of DC microgrid operation control is analyzed, the layered control theory and the control strategy based on DBS are introduced. Based on the design of the control of bidirectional AC-DC converter, an improved droop control strategy for grid-connected operation is proposed, and a layered control strategy for DC microgrid under isolated island operation is proposed, which is based on two-layer control theory. The equipment control layer and DC bus control layer are studied and designed respectively. The simulation model and control strategy of DC microgrid are simulated and analyzed. The bidirectional AC-DC converter is running under different working modes. The simulation results show that the improved droop control strategy proposed in this paper can well complete the control of DC microgrid grid-connected operation. The simulation results show that the layered control strategy proposed in this paper can realize the coordinated control of isolated island operation of DC microgrid and the smooth switching of each operation state.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

【参考文献】