电流源型数模综合仿真系统研究

发布时间：2018-10-30 09:33

【摘要】：近年来，微电网、分布式发电和可再生能源发展迅速，同时，微电网与电网间交互作用的研究因为其应用的越来越广泛而显得愈加重要。对于此类研究，电力系统实时仿真是一个高效便捷的工具，但是传统的纯数字仿真系统或者纯物理仿真系统已经满足不了对电力系统研究的要求，于是提出了结合两者优势的数字物理综合仿真系统技术。而电流源型数模综合仿真系统适用于数字侧是大阻抗的小系统而物理侧是小阻抗的大系统这种情况，，具有更好的灵活性和更广的应用范围。本文首先给出了电流源型数模综合仿真系统的整体框架，其中物理侧接口是重点研究对象，根据数模综合仿真系统的研究特点，选择三相整流和单相逆变作为物理侧接口的主回路拓扑。考虑数模综合仿真系统的稳定性问题，本文提出了基于理想变压器模型的补偿算法，并对该算法进行了仿真验证。本文另一主要研究内容是电流源型变换器的实现，对于整流器和逆变跟随器，分别给出了三相整流和单相逆变的PWM信号产生方案和控制方案，并在MATLAB中搭建了仿真模型，进行了稳态工况和动态工况的仿真实验。最后，将整流器和逆变器进行了串联仿真，并建立了一个微网小系统模型对数模接口进行了数模综合仿真，与全数字仿真进行了对比。仿真结果表明整流器可以提供稳定的直流电流源，逆变跟随器可以实现大部分波形的跟踪输出，数模接口能够满足数模综合仿真系统的要求，数模综合仿真的结果和全数字仿真一致，该接口装置可以实现电力系统实时仿真。
[Abstract]:In recent years, microgrid, distributed generation and renewable energy have developed rapidly. At the same time, the research of interaction between microgrid and grid becomes more and more important because of its more and more extensive application. For this kind of research, power system real-time simulation is an efficient and convenient tool, but the traditional pure digital simulation system or pure physical simulation system can not meet the requirements of power system research. Therefore, the digital physical comprehensive simulation system technology combining the advantages of both is put forward. The current source digital-analog integrated simulation system is suitable for the small system with large impedance on the digital side and the large system with small impedance on the physical side, which has better flexibility and wider application range. In this paper, the whole frame of the current source digital-analog integrated simulation system is presented, in which the physical side interface is the key research object, according to the characteristics of the digital-analog integrated simulation system, Three-phase rectifier and single-phase inverter are selected as the main circuit topology of physical side interface. Considering the stability of digital-analog integrated simulation system, a compensation algorithm based on ideal transformer model is proposed in this paper, and the algorithm is verified by simulation. For rectifier and inverter follower, the PWM signal generation scheme and control scheme of three-phase rectifier and single-phase inverter are given respectively, and the simulation model is built in MATLAB. The simulation experiments of steady and dynamic conditions are carried out. Finally, the rectifier and inverter are simulated in series, and a micro-grid small system model is established to simulate the digital-analog interface, which is compared with the full-digital simulation. The simulation results show that the rectifier can provide a stable DC current source, the inverter follower can realize the tracking output of most waveforms, and the digital-analog interface can meet the requirements of the digital-analog integrated simulation system. The results of digital and analog simulation are consistent with the full digital simulation. The interface device can realize real time simulation of power system.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM743

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