微电网多微源并列运行控制方法的研究

发布时间：2018-06-06 13:53

本文选题：不同容量微源 + 改进下垂控制　；参考：《华北电力大学》2014年硕士论文

【摘要】：微网技术为分布式电源大规模并网应用提供了有效的技术途径，但分布式电源常采用电力电子接口连接到微网，提高了分布式电源接口控制的灵活性并减少了系统的惯性，但是这将增加微网系统在维持能量平衡和频率稳定等方面的控制难度。如何实现分布式电源电力电子接口的稳定控制是微网必须解决的问题，其中不同容量微源的稳定并列运行是本文研究的重点。为实现不同容量微源的稳定并列运行，本文首先对现有的微源并列运行控制策略进行了分析总结，并搭建了微源并列运行的仿真模型，采用传统的下垂控制方法观察并列微源的运行原理；其次，文章借鉴不同容量同步发电机并列运行的控制思想对传统的下垂控制方法进行改进，提出了电压前馈电流补偿的改进下垂控制策略，实现了不同容量微源的有功功率、无功功率按比例自动分配，即微源的即插即用功能，解决不同容量发电单元分布式接入交流电网的技术难题，提高了微电网运行时的稳定性和可靠性。最后，文章分别利用仿真软件MATLAB/SIMULINK和高速处理芯片DSP TMS320F2812对提出的改进下垂控制方法进行仿真和实验验证。仿真和实验结果表明了改进的下垂控制方法提高了控制系统的抗干扰能力和跟随能力，有效地维持了逆变器输出电压的稳定，，降低了电流谐波畸变率，实现了微源并网逆变器在静态和暂态运行状况下的稳定运行。
[Abstract]:Microgrid technology provides an effective technical approach for large-scale grid-connected application of distributed power supply. However, power electronic interface is often used to connect to microgrid, which improves the flexibility of interface control and reduces the inertia of the system. However, this will make it more difficult to maintain the energy balance and frequency stability of the microgrid system. How to realize the stability control of power electronic interface of distributed power supply is a problem that must be solved in microgrid, and the stability and parallel operation of different capacity microsources is the focus of this paper. In order to realize the stable parallel operation of microsources with different capacities, this paper firstly analyzes and summarizes the existing microsource parallel operation control strategies, and builds the simulation model of microsource parallel operation. The traditional droop control method is used to observe the operation principle of parallel microsource. Secondly, the traditional droop control method is improved by referring to the control idea of parallel operation of synchronous generator with different capacities. An improved droop control strategy for voltage feedforward current compensation is proposed. The active power and reactive power of different capacity microsources are automatically distributed in proportion, that is, the plug and play function of microsource. To solve the technical problem of distributed access to AC grid with different capacity generating units, the stability and reliability of microgrid are improved. Finally, the improved droop control method is simulated and verified by simulation software MATLAB/SIMULINK and high-speed processing chip DSP TMS320F2812. The simulation and experimental results show that the improved droop control method improves the anti-interference ability and the following ability of the control system, effectively maintains the stability of the inverter output voltage, and reduces the harmonic distortion rate of the current. The stable operation of microsource grid-connected inverter under static and transient conditions is realized.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732

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