直流微电网周期波动对光伏系统输出功率的影响及其抑制  

Effect of DC microgrid periodical ripple on output power of photovoltaic system and its elimination

作　　者：吴凤江[1] 孙醒涛[2] 江彦[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江哈尔滨150001 [2]天津工业大学电气工程系,天津300387

出　　处：《电力自动化设备》2014年第3期34-39,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51107018);高等学校博士学科点专项科研基金(新教师类)资助项目(20102302120013);黑龙江省博士后科研启动金资助项目(LBH-Q11109)~~

摘　　要：分析了单相交流逆变负载对直流母线电压的影响及波动电压的表达式。进一步分析了直流母线电压波动对直流微电网中光伏发电系统输出功率的影响并推导了光伏电池输出电压、电流及输出功率的表达式,进而揭示出了由于直流母线电压的波动影响造成光伏电池无法持续处于最大功率输出点,间接降低了光伏发电系统的发电效率。提出了基于直流母线电压波动前馈的光伏发电系统电流闭环控制策略,有效抑制了直流母线电压波动对光伏电池输出功率的影响。仿真和实验结果验证了理论分析结果与所提方法的正确性和可行性。The effect of single-phase DC-AC load on DC-link bus voltage and the expression of DC-link voltage ripple are analyzed.The effect of DC-link voltage ripple on the output power of photovoltaic system in DC microgrid is analyzed and the expressions of photovoltaic cell output voltage,current and power are derived,which reveals that the maximum output power point of photovoltaic cell can hardly kept due to the DC-link voltage ripple and the efficiency of photovoltaic system is indirectly reduced.A strategy of closeloop control based on the feedforward of DC-link voltage ripple is thus proposed to effectively eliminate the effect.Simulative and experimental results validate the accuracy of theoretical analysis and the feasibility of the proposed control strategy.

关 键 词：直流微电网 光伏电池 发电 直流母线电压波动 前馈控制 效率优化 

分 类 号：TM615[电气工程—电力系统及自动化]