毕业设计说明书中文摘要如今，光能、风能等可再生能源，越来越被世界各国关注，微电网也应运而生。鉴于光伏设备等成本居高不下，微网多被用于偏远无电区域的中小系统，属微网的孤岛运行。微网对建设节约型社会很有利，对偏远区域供电问题也是很好的解决方法。所以微网孤岛的控制很重要。82933

本文先介绍直流微网单元和各微源接口，后提出各模块控制策略。光伏系统采用指数变步长扰动观察法最大功率点跟踪。能量存储设备则用电压电流双环控制。微网用P/V下垂的控制实现功率的平衡流动。最后搭建了以光伏发电系统、能量存储装置、下垂控制等为组成单元的直流微网模型，提出P/V下垂控制，并进行了仿真，验证了下垂控制使系统具有很好的功率跟踪特性，实现了功率的平衡流动。

毕业论文关键词  直流微网  分布式电源  建模  孤岛运行  下垂控制

毕业设计说明书外文摘要

Title   The Research on New Control Strategy of DC Microgrid                     

Abstract Nowadays, renewable energy sources such as solar energy and wind energy have been paid more and more attention by various countries in the world。 Microgrid was born as well。 In consideration of the high cost of photovoltaic cell, the microgrid is mainly used in remote areas where have no electricity。 This kind of microgrid operates in islanding mode。 Therefore, microgrid is conducive to building conservation-minded society, and solving the problem of remote areas’ power supply。 Hence, it is very important to research the control strategy of islanding microgrid。

This paper introduces the structure of dc microgrid and interface circuit of each micro power。 MPPT based on index variable step size P&O method is proposed for PV system。 Voltage and current double closed-loop control method is proposed for energy storage device。 The P/V droop control is proposed for the islanded microgrid to balance the power。 Finally, dc microgrid simulation model which consists of PV power generation system, energy storage device and the droop control unit has been established。 Simulation results display that these control methods can achieve power balance and make the system more stable。

Keywords  dc microgrid  distributed generation  Modeling  islanding  droop control

目   录

1  绪论 1

1。1  课题背景和意义 1

1。2  国内外研究现状 1

1。2。1  国外研究现状 1

1。2。2  国内研究现状 2

1。3  本文主要研究内容 2

2  直流微网单元与接口分析 4

2。1  直流微网的结构 4

2。2  直流微网的接入微源 4

2。2。1  光伏发电系统 5

2。2。2  储能装置 5

2。3  微源接口电路分析 5

2。3。1  BOOST变换器 5

2。3。2  BUCK变换器 6