基于虚拟同步电机控制的微电网逆变器研究

发布时间：2018-01-13 19:32

本文关键词：基于虚拟同步电机控制的微电网逆变器研究　出处：《燕山大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着传统大电网供电系统弊端的突显，分布式发电系统已经成为引领电力系统发展的新方向。微电网控制技术可以将分布式发电系统以微电网形式运行，不仅充分发挥了分布式发电的优势，而且有效避免了其直接入网带来的负面影响。首先，本文通过对微电网技术研究现状分析总结，得出微电网逆变器控制为目前微电网发展的关键问题所在。然后，通过对比分析传统的微电网逆变器控制方法，指出其控制方法存在的缺陷，在此基础上结合微电网的运行特性与技术要求，重点阐述一种新兴的控制策略，即基于虚拟同步电机控制。虚拟同步电机控制通过逆变器对同步电机输出特性的模拟，可以有效实现系统功率均分问题，并通过对同步电机转动惯量的模拟，有效改善传统控制方法中频率的稳定性。本文对该控制策略的理论依据进行详细的分析论证，并重点设计了虚拟调速器、虚拟励磁控制器和虚拟同步电机算法。通过MATLAB/Simulink软件对该控制策略进行验证，仿真结果表明，采用虚拟同步电机控制的逆变器能够很好的模拟同步电机的运行特性，且具有良好的稳态及动态响应，满足微电网的运行要求。针对微电网逆变器并联组网的问题，，本文将虚拟同步电机控制策略应用于并联组网控制，仿真验证并联运行的微电网逆变器能够满足系统均衡负载要求，且稳定可靠运行。最后，搭建了功率等级为3kW的三相逆变器平台，选用TMS320F2812芯片作为该系统的主控制芯片，在CCStudio v3.3环境下完成了控制程序的编写，在所搭建的实验平台上完成了系统开环以及闭环的实验，验证了虚拟同步电机控制的有效性和可行性。
[Abstract]:With the disadvantages of traditional power supply system in large power grid, distributed generation system has become a new direction leading the development of power system. Microgrid control technology can operate distributed generation system in the form of microgrid. It not only gives full play to the advantages of distributed power generation, but also effectively avoids the negative impact brought by its direct access to the network. Firstly, by analyzing and summarizing the research status of microgrid technology, this paper draws the conclusion that the control of micro-grid inverter is the key problem in the development of micro-grid. By comparing and analyzing the traditional control methods of microgrid inverter, the defects of the control methods are pointed out. On the basis of this, a new control strategy is expounded based on the operation characteristics and technical requirements of microgrid. That is, based on the virtual synchronous motor control. Virtual synchronous motor control through the inverter to the synchronous motor output characteristics of simulation, can effectively achieve the system power distribution problem, and through the synchronous motor moment of inertia simulation. In this paper, the theoretical basis of the control strategy is analyzed and demonstrated in detail, and the virtual governor is designed. Virtual excitation controller and virtual synchronous motor algorithm. The control strategy is verified by MATLAB/Simulink software, and the simulation results show that. The inverter controlled by virtual synchronous motor can well simulate the operation characteristics of synchronous motor and has good steady and dynamic response. To meet the operational requirements of microgrid. Aiming at the problem of parallel networking of microgrid inverter, this paper applies the control strategy of virtual synchronous motor to parallel networking control. Simulation results show that the microgrid inverter can meet the requirements of load balancing and can run stably and reliably. Finally, a three-phase inverter platform with a power grade of 3kW is built, and the TMS320F2812 chip is selected as the main control chip of the system. In the environment of CCStudio v3.3, the control program is written, and the open loop and closed loop experiments are completed on the experimental platform. The validity and feasibility of virtual synchronous motor control are verified.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464;TM341

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