基于双并联Boost-Buck电路的光伏发电系统电压稳定控制  

Voltage stability control of PV generation system based on double parallel Boost-Buck chopper

作　　者：和贝[1] 张建成[1] 钟云[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电力自动化设备》2010年第7期100-103,共4页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(50677018)~~

摘　　要：针对目前光伏发电系统电压稳定性较差的问题,以超级电容器作为储能元件,设计了双并联双向Boost-Buck电路以提高光伏发电系统的电压稳定性。当光伏电池阵列输出电压低于额定值时,超级电容器储能单元释放能量传输给直流母线以提高直流母线电压;当光伏电池阵列输出电压高于额定值时,将直流母线多余的电能向超级电容器端传输。建立了Boost-Buck电路的状态空间方程,对光伏电池阵列输出电压的不同运行状态,设计了双并联双向Boost-Buck电路的PI闭环控制策略。仿真结果表明,当光伏电池阵列输出电压不稳定时,通过控制能量在超级电容器储能系统与光伏发电系统直流母线之间的相互传递,光伏电池阵列输出电压的稳定性可以得到有效控制。As the present PV（PhotoVoltaic） generation system has poor voltage stability,the double parallel Boost-Buck chopper is designed with the super capacitor as energy storage element to improve it.When the output voltage of PV arrays is lower than rated value,the super capacitor releases energy to increase DC bus voltage,and when the output voltage is higher than rated value,the excrescent energy of DC bus is utilized to charge the super capacitor.The state space equation of Boost-Buck chopper is established and its PI closed-loop control strategy is designed for different operating states of the output voltage.Simulative results show that the stability of output voltage is effectively controlled by controlling the energy transfer between super capacitor and DC bus.

关 键 词：超级电容器储能 光伏发电 电压稳定性 双并联Boost-Buck电路 

分 类 号：TM615[电气工程—电力系统及自动化]