直流微电网仿真建模及其控制策略研究
发布时间：2019-01-21 20:48
【摘要】：随着社会的发展,能源与环境问题日益凸现出来,并制约着传统大电网的发展。而在这样的形势下,对于新的、可再生能源的合理利用就显得尤为重要,所以分布式发电这种供电形式越来越受到重视。分布式电源的优势不仅在于其可再生性以及环保效应,其产生的电能还可就地消耗,节省输变电成本。但分布式电源本身的局限性,例如其波动性大、可控性差、单机接入成本高等,都制约着其发展。而微电网概念的提出,则很大程度上地解决了分布式电源接入电网中的种种问题,为分布式能源提供了更大的发展空间。本文所研究的直流微电网,现阶段对其研究较少,但由于其相对于传统交流微电网在传输以及配电形式上的种种优势,相信一定会有很大的发展空间。本文基于 PSCAD(Power Systems Computer Aided Design)软件,分析了风力发电机和光伏电池的基本原理,并通过直流母线将两种分布式电源与负荷以及交流大电网相联接,构成直流微电网模型。并以改善直流母线电压稳定性为目的,在直流微电网中应用了相关的控制策略,对于并网模式下的直流微电网进行仿真模拟分析,通过添加改变分布式电源出力以及负荷波动等扰动,来验证稳压控制策略对于整个系统的有效性。
[Abstract]:With the development of society, the problems of energy and environment come out day by day, and restrict the development of traditional power grid. In such a situation, the rational utilization of new and renewable energy is particularly important, so distributed generation is becoming more and more important. The advantages of distributed power generation lie not only in its reproducibility and environmental protection effects, but also in the local consumption of electricity generated by it and in saving the cost of transmission and transformation. However, the limitations of DG itself, such as its high volatility, poor controllability and high cost of single access, all restrict its development. However, the concept of microgrid has solved the problems of distributed power grid to a great extent and provided more space for the development of distributed energy. The DC microgrid studied in this paper is less studied at present, but due to its advantages over the traditional AC microgrid in transmission and distribution forms, it is believed that there will be a lot of room for development. Based on PSCAD (Power Systems Computer Aided Design) software, the basic principle of wind turbine and photovoltaic cell is analyzed in this paper. The DC microgrid model is constructed by connecting the two kinds of distributed generation with load and large AC power grid by DC bus. In order to improve the stability of DC bus voltage, the related control strategy is applied in DC microgrid, and the simulation analysis of DC microgrid in grid-connected mode is carried out. The stability control strategy is proved to be effective for the whole system by adding disturbance such as changing the output force and load fluctuation of the distributed power supply.
【学位授予单位】：沈阳工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM727;TM743
本文编号：2413025
[Abstract]:With the development of society, the problems of energy and environment come out day by day, and restrict the development of traditional power grid. In such a situation, the rational utilization of new and renewable energy is particularly important, so distributed generation is becoming more and more important. The advantages of distributed power generation lie not only in its reproducibility and environmental protection effects, but also in the local consumption of electricity generated by it and in saving the cost of transmission and transformation. However, the limitations of DG itself, such as its high volatility, poor controllability and high cost of single access, all restrict its development. However, the concept of microgrid has solved the problems of distributed power grid to a great extent and provided more space for the development of distributed energy. The DC microgrid studied in this paper is less studied at present, but due to its advantages over the traditional AC microgrid in transmission and distribution forms, it is believed that there will be a lot of room for development. Based on PSCAD (Power Systems Computer Aided Design) software, the basic principle of wind turbine and photovoltaic cell is analyzed in this paper. The DC microgrid model is constructed by connecting the two kinds of distributed generation with load and large AC power grid by DC bus. In order to improve the stability of DC bus voltage, the related control strategy is applied in DC microgrid, and the simulation analysis of DC microgrid in grid-connected mode is carried out. The stability control strategy is proved to be effective for the whole system by adding disturbance such as changing the output force and load fluctuation of the distributed power supply.
【学位授予单位】：沈阳工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM727;TM743
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