摘要微电网并离网模式之间的切换是微电网控制中一个重要的环节。微电网工作于并网模式时，将分布式发电装置产生的能量送入电网；工作于离网模式时，在电网供电中断时为本地负载提供电压频率支撑。为了维持对负载的供电，两种工作模式之间的转换应为不停机重启的无缝切换。微电网平滑切换不仅能保证切换运行模式后供电的快速性，还能保证微电网区域内对重要负荷供电的持续可靠性以及电能质量。因此研究微电网平滑切换的方法对于微电网控制具有非常重要的意义。

本文首先对微网逆变器在不同运行模式下的控制原理进行了深入研究，发现在运行模式切换时控制回路中的参考信号发生突变，从而导致了切换时电压、电流的震荡，根据信号的突变，提出了一种平滑切换补偿控制算法，即在切换运行模式时对发生突变的参考信号进行补偿，从而使参考信号平滑过渡，最终达到平滑切换的目的。最后利用MATLAB/Simulink仿真软件建立微网主控逆变电路模型，并通过模拟仿真验证了该平滑切换补偿控制方法的有效性。47994

毕业论文关键词：微电网；并离网运行；平滑切换；补偿控制；MATLAB 

毕业设计说明书外文摘要

Title:   The research of the microgrid’s smooth switchover between of the interconnection and off-grid model                                                  

Abstract:

It is an important component of the micro grid control that microgrid’s  switchover between of the interconnection and off-grid mode. When Microgrid work in the interconnection mode, it will deliver the energy of the distributed generation device into the grid. If it work in off-grid mode, at the time of interruption of power supply，it will provide local load voltage and frequency support. In order to maintain the load of power supply, the conversion between of the two work modes should be non-stop to restart but the seamless switching. Micro grid smooth switch can not only ensure the quickness of power supply after the operation mode switch, it also can guarantee  power supply reliability and power quality to the important load in the micro grid area . So there is a very important significance of the smooth switching method to the micro grid for its control.

At first, this paper takes a further study on the network control principle of inverter under different operating mode, and found that there are reference signals mutation in control circuit when switch the operation mode, leading to  the voltage and current shock, so a smooth switchover compensation control algorithm is proposed according to the signals mutation, it means that making a compensation for the mutational reference signals when switching operation mode, so that the reference signal will transit smoothly, finally the purpose of smooth transition will be achieved. At last, I establish a microgrid master inverter circuit model by using MATLAB/Simulink software, and verify the effectiveness of the smooth switch compensation control method through the simulation.

Keywords:  Micro network; running in interconnection and off-grid model; smooth switch; MATLAB

目录

1 引言 1

1.1 课题研究背景及意义 1

1.2 并离网平滑切换技术的研究现状 1

1.3 研究工作内容 4

2 基于主从控制模式的微电网研究 5

2.1 微电网主从模式研究 5

2.2 并网逆变器控制研究