教学用微网平台设计及其双向逆变器的研制
发布时间：2019-05-24 18:14
【摘要】：随着环境和能源问题日益凸显,分布式发电技术越来越受到人们的重视。但是功率不可控的分布式电源接入后电网,会出现很多不利影响。微网的出现在很大程度上解决了这个问题。研发一款教学用微网平台,对于培养微网技术专业人才,具有重要意义。本文设计了一套教学用微网平台。该微网平台由储能单元、实训试验台、光伏发电系统、风力发电系统、负载模块等子系统组成。其交流母线的线电压为36V,通过隔离变压器与市电网相连。该平台采用主从控制结构,储能单位作为微网平台的主源,其余微源作为从源,可以正常工作于并网和离网两种模式。并网运行时,所有微源均采用PQ控制方式,以单位功率因数的方式向电网输出功率。孤网运行时,储能单元作为主源,采用V/f控制方式,提供微网交流母线电压和频率的支撑,其余微源仍然采用PQ控制方式,微网平台内功率能够维持平衡。教学用微网平台在孤网时应能正常运行,双向逆变器是储能单元与微网平台连接的媒介,储能单元又是微网平台孤网运行时电压和频率支撑的提供者。因而,双向逆变器对于微网平台的正常运行至关重要。本文详细分析了双向逆变器的工作原理和空间矢量调制原理,搭建了双向逆变器的数学模型,在此基础上给出了双向逆变器的参数设计值。通过控制双向逆变器侧的电流方向,可以实现能量以单位功率因数的方式双向流动。双向逆变器在微网平台孤网运行时,工作于逆变模式,用以维持交流母线电压和频率的稳定。微网平台并网运行时,双向逆变器可以按照需要工作于整流和逆变两种模式,用于储能单元的充放电。双向逆变器比普通的并网逆变器多了整流的功能,通过程序上的改动,双向逆变器还可以当做普通的并网逆变器使用。本文所设计的双向逆变器的功率等级为100W,整流和逆变时并网电流波形畸变率均小于5%。最后,本文在Simulink中搭建了微网模型,并且设计了双向逆变器的实验样机,通过仿真和样机实验验证了设计的合理性。
[Abstract]:With the increasingly prominent problems of environment and energy, distributed power generation technology has been paid more and more attention. However, there will be a lot of adverse effects on the power grid after the uncontrollable distributed power supply is connected to the power grid. The emergence of microgrid has solved this problem to a great extent. It is of great significance to develop a teaching microgrid platform for the training of microgrid technical professionals. In this paper, a set of microgrid platform for teaching is designed. The microgrid platform is composed of energy storage unit, training test-bed, photovoltaic power generation system, wind power generation system, load module and so on. The line voltage of the AC bus is 36 V, which is connected to the city power grid through the isolation transformer. The platform adopts master-slave control structure, energy storage unit as the main source of micro-grid platform, and other micro-sources as slave sources, which can work normally in both grid-connected and off-grid modes. When connected to the grid, all microsources use PQ control mode to output power to the power grid in the form of unit power factor. When the isolated network is running, the energy storage unit acts as the main source and adopts V 鈮，
本文编号：2485078
[Abstract]:With the increasingly prominent problems of environment and energy, distributed power generation technology has been paid more and more attention. However, there will be a lot of adverse effects on the power grid after the uncontrollable distributed power supply is connected to the power grid. The emergence of microgrid has solved this problem to a great extent. It is of great significance to develop a teaching microgrid platform for the training of microgrid technical professionals. In this paper, a set of microgrid platform for teaching is designed. The microgrid platform is composed of energy storage unit, training test-bed, photovoltaic power generation system, wind power generation system, load module and so on. The line voltage of the AC bus is 36 V, which is connected to the city power grid through the isolation transformer. The platform adopts master-slave control structure, energy storage unit as the main source of micro-grid platform, and other micro-sources as slave sources, which can work normally in both grid-connected and off-grid modes. When connected to the grid, all microsources use PQ control mode to output power to the power grid in the form of unit power factor. When the isolated network is running, the energy storage unit acts as the main source and adopts V 鈮，
本文编号：2485078
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