双馈型抽水蓄能机组控制的研究

发布时间：2018-05-25 15:04

本文选题：抽水蓄能 + 双馈感应电机　；参考：《广东工业大学》2015年硕士论文

【摘要】：目前,我国电力系统建设正处于快速发展阶段,存在用电高峰时供电紧张、有功无功储备不足,用电低谷时输配电容量利用率不高和输电效率低等问题,发展具有调峰填谷,调频调相、事故备用等多种功能的抽水蓄能系统,是我国新型电力系统的一个重要组成部分。本文针对传统抽水蓄能系统所采用的同步水轮机组效率低、转速适应能力弱的情况,研究一种基于双馈方式的抽水蓄能系统,通过分析双馈感应电机(DFIG)基本理论的基础上,探讨双馈型抽水蓄能机组的矢量控制策略,并对机组的零速启动及同步并网过渡过程进行了仿真和实验研究。首先,分析国内外双馈式抽水蓄能发电产业的发展现状和趋势,介绍抽水蓄能机组启动方式和双馈感应电机主要控制技术。其次,分析双馈型抽水蓄能系统结构模型,介绍双馈感应电机的基本运行机理和坐标变换原理,推导双馈感应电机在三相静止坐标系、两相静止坐标系及同步旋转坐标系下的数学模型。在此基础上推导了电网侧变换器数学模型,并探讨电网侧变换器矢量控制策略,结合经典PI控制技术、空间矢量控制技术和三相数字锁相环控制技术,建立基于电网电压定向的网侧变换器控制框图,利用Matlab/S imulink建立网侧变换器仿真模型进行分析和研究。通过对电网侧变换器的分析和双馈感应电机转子侧变换器的控制策略研究,提出基于转子侧零速自启动矢量控制方法,推导了空载并网及发电运行的控制策略,并对电机启动过渡到空载并网和功率解耦进行仿真研究。仿真结果表明,所采用的控制策略能够实现机组自启动至并网发电过程,控制简单,运行可靠。最后,以2.2 KW的双馈感应发电机为样机,搭建双馈式抽水蓄能系统实验平台,详细介绍各个硬件模块的功能设计及软件流程的设计,完成双馈型抽水蓄能机组启动至并网过渡过程的实验研究。
[Abstract]:At present, the construction of electric power system in our country is in the rapid development stage, there are some problems such as tight power supply at the peak of power consumption, insufficient reserve of active and reactive power, low utilization ratio of transmission and distribution capacity and low transmission efficiency in the period of low power consumption, so the development has the characteristics of peak shaving and valley filling. The pumped storage system with various functions, such as frequency modulation and phase modulation, accident reserve, is an important part of the new power system in China. In this paper, a pumped storage system based on doubly-fed induction motor (DFIGM) is studied, which has low efficiency and weak speed adaptability in the traditional pumped storage system, based on the analysis of the basic theory of doubly-fed induction motor (DFIGM). The vector control strategy of doubly-fed pumped storage unit is discussed, and the zero-speed start-up and synchronous grid-connected transition process of the unit are simulated and experimentally studied. Firstly, the development status and trend of doubly-fed pumped storage power generation industry at home and abroad are analyzed, and the start-up mode of pumped storage unit and the main control technology of doubly-fed induction motor are introduced. Secondly, the structure model of doubly-fed pumped storage system is analyzed, the basic operation mechanism and coordinate transformation principle of doubly-fed induction motor are introduced, and the three-phase static coordinate system of doubly-fed induction motor is deduced. The mathematical model of two phase stationary coordinate system and synchronous rotating coordinate system. On this basis, the mathematical model of grid-side converter is derived, and the vector control strategy of grid-side converter is discussed, which combines classical Pi control technology, space vector control technology and three-phase digital phase-locked loop control technology. The control block diagram of grid-side converter based on grid voltage orientation is established, and the simulation model of grid-side converter based on Matlab/S imulink is analyzed and studied. Based on the analysis of the grid-side converter and the study of the control strategy of the rotor side converter of the doubly-fed induction motor, a zero-speed self-starting vector control method based on the rotor side is proposed, and the control strategy of no-load grid-connected and generating operation is deduced. Simulation research on the transition of motor start to No-load grid-connected and power decoupling is carried out. The simulation results show that the proposed control strategy can realize the process from start-up to grid-connected generation, and the control is simple and the operation is reliable. Finally, taking the 2.2 KW doubly-fed induction generator as the prototype, the experimental platform of the doubly-fed pumped storage system is built, and the function design of each hardware module and the design of the software flow are introduced in detail. The experimental study on the transition from start-up to grid connection of doubly-fed pumped storage unit is completed.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV743;TV734

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