微电网逆变器的并联控制策略研究

发布时间：2018-04-24 01:33

本文选题：微电网 + 并联逆变器　；参考：《华北电力大学》2017年硕士论文

【摘要】：环境问题的突出与能源危机的加剧推动了分布式发电技术的发展,微电网是连接分布式电源与大电网之间的纽带,逆变器作为微电网中的关键设备具有举足轻重的地位,本文就微电网并联逆变器的功率解耦及功率分配问题进行了研究。本文首先介绍了课题的研究背景及现有的微电网功率解耦及并联逆变器的功率分配控制策略,其次对三相逆变器的数学模型及控制策略进行了简单介绍,针对孤岛运行模式下的并联逆变器功率解耦及功率分配问题,本文在第3章与第4章中进行了详细阐述。第3章中,采用了基于坐标变换的虚拟功率下垂控制方法,并利用相对增益分析法对其解耦效果进行了分析,提出了改进的功率分配控制策略;为了保证逆变器工作在其安全运行范围内,提出了新型虚拟功率限幅控制方法,保障了逆变器的安全稳定运行。第4章中,针对并联逆变器的功率分配问题,提出了基于动态一致性算法的功率分配策略,每台微源与其相邻的部分微源进行通信,利用动态一致性算法对微电网标幺化的无功功率均值进行估计,并利用积分器对下垂特性曲线进行自适应调节,最终实现无功功率在并联微源间的比例分配。第3章与第4章均进行了仿真分析,利用MATLAB/Simulink对所提控制策略的正确性进行了验证。
[Abstract]:The highlight of environmental problems and the aggravation of energy crisis promote the development of distributed generation technology. Microgrid is the link between distributed generation and large power grid. Inverter plays a pivotal role as the key equipment in microgrid. The power decoupling and power allocation of microgrid parallel inverters are studied in this paper. This paper first introduces the research background of the subject and the existing power decoupling and power allocation control strategy of the parallel inverter. Secondly, the mathematical model and control strategy of the three-phase inverter are briefly introduced. To solve the power decoupling and power allocation problems of parallel inverters in islanding mode, the third and fourth chapters are discussed in detail in this paper. In chapter 3, the virtual power droop control method based on coordinate transformation is adopted, and the decoupling effect is analyzed by using relative gain analysis, and an improved power allocation control strategy is proposed. In order to ensure that the inverter works in its safe range, a novel virtual power limiting control method is proposed to ensure the safe and stable operation of the inverter. In chapter 4, for the power allocation problem of parallel inverter, a power allocation strategy based on dynamic consistency algorithm is proposed. Each microsource communicates with some of its adjacent microsources. The dynamic consistency algorithm is used to estimate the mean value of reactive power in microgrid, and the integrator is used to adjust the sag characteristic curve adaptively. Finally, the proportional distribution of reactive power between parallel microsources is realized. In chapter 3 and chapter 4, the correctness of the proposed control strategy is verified by MATLAB/Simulink.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464

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