专业学位硕士学位论文
Research On The Grid-connected PhotovoltaicPower GenerationSystemWithEnergyStorageModule
作者姓名： 王梅工程领域：机械工程学 号： 31104050指导教师： 邢英杰副教授完成日期： 2013.05
大连理工大学
Dalian University of Technology
大连理工大学学位论文独创性声明
作者郑重声明：所呈交的学位论文，是本人在导师的指导下进行研究工作所取得的成果，尽我所知，除文中已经注明引用内容和致谢的地方外，本论文不包含其他个人或集体已经发表的研究成果，也不包含其他已申请学位或其他用途使用过的成果.与我一同工作的同志对本研究所做的贡献均已在论文中做了明确的说明并表示了谢意.
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学位论文题目： 带储能模块的并网光伏发电系统研究王梅作者签名： 日期：2013年6月1日
摘要
目前全球能源形势不容乐观，开发可再生新能源，改变能源结构成为大势所趋.太阳能资源作为分布范围广泛、洁净环保、储量无限的新能源已成为开发的重要对象.现代工业中最直接利用的能源就是电能，所以利用太阳能发电作为电网的重要补充形式成为研究热点.由于光伏发电不稳定，会受外界环境和负载的影响，并网会对电网电能造成污染，所以光伏发电技术中如何高效利用太阳能产生稳定电能，将产生的电能无污染馈送到电网成为了日前的重点研究方向.
电池技术已经相当成熟，本系统主要对充放电控制方法进行研究，充电采用三阶段控制， 开发了等效不间断电源的储能模块，储能模块包括充放电控制和蓄电池两部分，蓄放电采用电压控制，设计了电压外环电流内环的双闭环控制策略，该控制策略能有效的延长蓄电池的寿命；光伏电池阵列的输出功率随环境及负载的变化面不同，其中有且仅有一个最大功率点，为了实现光伏电池阵列实时工作在最大功率点达到光伏发电的高效利用，设计了定电压启动变步长追踪的新型电导增量控制算法，使光伏电池阵列输出仅需0.05s即可达到稳定，且功率波动极小：设计了三相并网逆变器，当光伏电池阵列产生电能大于负载所需时，可将多余的电能输送到电网，避免光伏发电的浪费，还可节约成本，当光伏电池阵列产生电能不足负载使用时，电网输送电能进行补充，逆变器的控 制方式采用基于空间矢量的电压外环电流内环的双闭环策略，既实现了单位功率因数馈送电能不对电网造成污染又减小了直流母线电压的波动.
针对系统随着负载及其环境变化产生的七种不同工作状态，设计了工作模式切换控制策略，使光伏电池模块、储能系统模块和并网模块的工作状态做出相应的调整.最终在各模块原理分析及控制策略设计的基础上搭建了整体系统的仿真模型，在Simulink软件中进行了不同工作模式的仿真分析，仿真结果验证了系统各模块工作状态的正确性.
关键词：光伏发电：最大功率跟踪：储能模块的充放电；并网逆变器：直流母线
ResearchOnThe Grid-connectedPhotovoltaicPower Generation SystemWithEnergyStorageModule
Abstract
As the global energy situation is not optimistic at present thc development of newrenewabic cncrgy and the transformation of energy structure has bce the trend of The Times. The solar energy resource one kind of widely distributed lean and infinite cnergy hasbee an important object of study. in the modem industry electric energy is the most directuse of energy. And using solar energy in electricity generation as an important supplement forpower grid is a rescarch hotspot. Because of extemal environent and load the ciectricitygcncrated by solar energy is not steady and grid-connection is an adverse effect for the grid. Considering hc problem how to use solar energy to generate stcady electricity effciently andfoed the grid without adverse effect is the key research direction at present.
Dcsigned one kind of cnergy storage device that can supply power continually. Theenergy storagc device includes charge and discharge control system and storage cells. Considering the technology of storage cells is maturc. This article researched charge anddischarge control method. Charge is controlled by three stages and discharge is controlled byvoltage.Designed double closed loop strategy consisted of voltage outer loop and current innerloop. This kind of control strategy is able to prolong the life of storage cells. The output power of photovoltaic cells array is changed under different environments or loads. In these situations there is one and only one maximum power point. In order to let photovoltaic cells array work inthe maximum power point in real time efficiently designed a new conductance increment s ds qe q pxen pue o esuo q ps s m ne nu the photovoltaic cells array just cost 0.05s to achieve steady status and the fluctuation of poweris very slightly. Designed thre-phase grid-connection inverter which can supply redundantelectricity energy to power grid. By this strategy waste is avoided and cost is saved. When theelectricity generated by photovoltaic cells array cannot undertake the load grid willsuppiement encrgy to the system. The inverter was designed to be one kind of voltage and current double closed loop control systcm based on space vector. In this way DC bus voltagecan be stabilized and unity power factor output does not have harmfui effect on power grid.
As the system have seven different working statutes in different load and its environment designed switching control strategy of working statutcs adjusting working model of photovoltaic cells storage systcm and inverter. Finally on the basis of principle analysis and
design of control strategy set up the overal system model and analyzed each kind of workingmode of the system by Simulink software. The result of simulation proved the working statutsof the system's models.
Tracking: Energy Storage Module Charging And Discharging; Three-phase Grid-connected Key Words: Grid-connected Photovoltaic Power Generation; Maximum Power PointInverter;DC Bus
