基于DSP的7.5kW背靠背变流器控制系统的研究与实现

发布时间：2018-04-01 12:00

本文选题：背靠背变流器　切入点：功率因数　出处：《北京工业大学》2014年硕士论文

【摘要】：随着能源与环境问题的日益突出，不同地区的用电负荷呈现出了多样性，传统电网已不能满足其需求，因此微电网技术逐渐成为电力、电气等相关技术领域的研究热点和重点问题。作为微电网核心单元的背靠背变流器技术也得到了广泛关注。由于背靠背变流器可以实现AC-DC-AC两端能量的可控交互，且具有功率因数可调、输出电流谐波小、能量双向流动等特点，在可再生能源分布式发电、微电网等领域获得了广泛应用。本文以三相背靠背变流器控制系统为研究对象，从理论研究、设计调试及系统实现等方面进行论述。首先，本文在总结分析三相背靠背变流器现阶段的国内外研究现状与发展趋势的基础上，根据系统的性能指标要求，进行了系统设计的可行性分析，进而确定了系统的设计方案。其次阐述了三相背靠背变流器关键技术的工作原理，基于坐标变换思想，应用矢量变换的控制算法、SVPWM调制技术，结合课题采用的交流负载特性，完成永磁同步电机的数学模型建立与控制策略研究工作。考虑到系统网侧与负载侧系统的联调，研究系统启动逻辑控制与系统协调控制策略。在此基础上，根据系统设计方案，文中对系统硬件主要参数计算与电路设计进行较为详细地说明，提出了交流进线电抗器与直流稳压电容参数设计方法和主要电路单元的设计方案。基于三相背靠背变流器控制策略，以控制器DSP（TMS320F2812）为核心，，设计控制系统软件结构，完成系统软件程序编写。使用MATLAB Simulink仿真软件验证系统设计的正确性；最后，文中对根据系统实验要求搭建的三相背靠背变流器系统试验平台进行介绍，并对系统整体调试数据和实时波形进行分析，从而充分验证了课题研究中三相背靠背变流器系统设计与控制策略的可行性与正确性。
[Abstract]:With the increasingly prominent energy and environmental problems, different regions of the load presents diversity, the traditional power grid can no longer meet its needs, so micro-grid technology is becoming power. The technology of back-to-back converter, which is the core unit of microgrid, has been paid more and more attention. Because back-to-back converter can realize the controllable interaction of energy between two ends of AC-DC-AC, With the characteristics of adjustable power factor, low output current harmonics, two-way energy flow and so on, it has been widely used in the fields of renewable energy distributed generation, micro-grid, etc. In this paper, the three-phase back-to-back converter control system is taken as the research object. First of all, on the basis of summarizing and analyzing the current domestic and international research status and development trend of three-phase back-to-back converter, according to the performance requirements of the system, this paper discusses the theoretical research, design and debugging, and system implementation. The feasibility of the system design is analyzed, and then the design scheme of the system is determined. Secondly, the working principle of the key technology of the three-phase back-to-back converter is expounded. Based on the idea of coordinate transformation, the SVPWM modulation technology is applied to the control algorithm of vector transformation. Based on the characteristics of AC load, the mathematical model and control strategy of permanent magnet synchronous motor (PMSM) are studied. Considering the connection between system network side and load side system, the system startup logic control and system coordinated control strategy are studied. On this basis, according to the system design scheme, the main parameters calculation and circuit design of the system hardware are described in detail. This paper presents the design method of parameters of AC feed-in reactor and DC voltage stabilized capacitor and the design scheme of main circuit unit. Based on the control strategy of three-phase back-to-back converter, the software structure of control system is designed based on the controller DSPF2812 (TMS320F2812). Complete the system software programming. Use MATLAB Simulink simulation software to verify the correctness of the system design; Finally, the test platform of three-phase back-to-back converter system is introduced, and the debugging data and real-time waveform of the system are analyzed. The feasibility and correctness of the design and control strategy of the three-phase back-to-back converter system are fully verified.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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