基于DSP的无互联线并联逆变器的研究与应用

发布时间：2018-10-15 15:49

【摘要】：随着社会经济的快速发展,传统化石能源日益减少。迫使人们寻找新的能源结构,分布式发电应时而生。逆变器并联控制方式是一种提高发电系统冗余及其可靠性的重要手段,能够解决分布式发电系统容量需求日益增大的问题。但分布式发电具有分散性的特点,使逆变器并联工作时在空间位置上相距较远,很难实现互相连线通信。因此,无互联线逆变电源并联控制技术成为业界研究的热点,功率均分及环流问题亟待解决。本文首先从逆变电源的电路拓扑模型着手,介绍了单台逆变电源主电路拓扑及数学模型,推导出两台逆变电源并联拓扑模型及数学模型。在此基础上,分析了系统功率分配不均及产生环流的原因。然后,介绍传统下垂控制策略,用以解决无互联线并联逆变系统功率均分及环流问题。通过对策略的基本原理及调节过程分析知,传统下垂策略在控制时因各控制参数存在耦合关系,不能单纯的通过频率及幅值下垂特性进行控制,因此提出了基于功率解耦的下垂控制策略。此控制策略可以克服传统下垂特性的局限性,同时能够实现系统功率均分。最后,以TMS320F28069为主控芯片,对无互联线并联逆变系统进行软硬件设计,并在Matlab/Simulink仿真环境下,搭建无互联线并联逆变器仿真模型,验证功率解耦下垂控制策略对于功率均分的有效性。
[Abstract]:With the rapid development of social economy, the traditional fossil energy is decreasing day by day. People are forced to look for new energy structures, and distributed power generation comes at the right time. Parallel inverter control is an important means to improve the redundancy and reliability of power generation system. It can solve the problem that the capacity of distributed generation system is increasing day by day. But the distributed generation has the characteristic of dispersibility, which makes the inverter work in parallel far in the space position, so it is difficult to realize the communication with each other. Therefore, the parallel control technology of the inverters without interconnection lines has become a hot spot in the industry, and the problems of power equalization and circulation need to be solved urgently. In this paper, the topology and mathematical model of the main circuit of a single inverter power supply are introduced, and the parallel topology model and mathematical model of two inverter power sources are derived from the circuit topology model of the inverter power supply. On this basis, the system power distribution and the causes of circulation are analyzed. Then, the traditional droop control strategy is introduced to solve the power equalization and circulation problems of parallel inverter system without interconnection line. Based on the analysis of the basic principle of the strategy and the adjustment process, it is found that the traditional droop strategy can not be controlled simply by the frequency and amplitude droop characteristics because of the coupling relationship between the control parameters. Therefore, a droop control strategy based on power decoupling is proposed. This control strategy can overcome the limitation of traditional droop characteristics and realize the system power equalization. Finally, using TMS320F28069 as the main control chip, the hardware and software of parallel inverter system without interconnected wire are designed, and the simulation model of parallel inverter without interconnected wire is built under the Matlab/Simulink simulation environment. The effectiveness of the power decoupling droop control strategy for power equalization is verified.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464

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