直流微电网中光伏发电系统的比例-积分-谐振控制  

Proportional-Integral-Resonant Control of Photovoltaic Generation System in DC Microgrid

作　　者：吴凤江[1] 孙醒涛[2] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001 [2]天津工业大学电气工程与自动化学院,天津市西青区300387

出　　处：《电网技术》2014年第2期275-280,共6页Power System Technology

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

摘　　要：直流微电网带动单相交流逆变负载时,直流电压会产生2倍频的周期波动,进而造成联网的光伏发电系统输出功率产生周期波动,无法持续处于最大功率输出点,从而间接降低了其发电效率。为解决上述问题,在分析直流电压周期扰动时的光伏发电系统输出功率特性的基础上,提出了光伏发电系统输出电流的比例-积分-谐振控制策略,比例-积分调节器用于电流的稳态无静差控制,而谐振控制器用于抑制周期扰动。详细分析了所提出方法的稳态误差、稳定性,各控制参数变化对电流控制性能以及直流电压波动抑制效果的影响,给出了各参数选取原则。仿真和实验结果验证了理论分析结果与所提出方法的正确性和可行性。When DC microgrid supplies single-phase AC inverters, the ripple with two-fold AC frequency will appear in the voltage of DC-link bus, it leads to periodic fluctuation in the output of grid-connected photovoltaic （PV） generation system and solar cells cannot operate continuously at its maximum power point, thus the generation efficiency of PV generation system is decreased indirectly. In allusion to it, on the basis of analyzing output characteristics of PV generation system under DC-link voltage with periodic perturbation, a proportional-integral-resonant （PIR） control strategy for output current of PV generation system is proposed. The proportional- integral controller is used for static control under steady state and the resonant controller for suppressing periodic perturbation. The steady state error, stability of the proposed method as well as the impact of control parameter variation on current control performance and the effect of suppressing DC voltage fluctuation are analyzed in depth, and in the further, the principle of selecting parameters is given. The correctness and feasibility of the proposed method as well as results of theoretical analysis are verified by results of both simulation and experiments.

关 键 词：直流微电网 光伏发电 直流电压波动 比例-积分-谐振控制 效率优化 

分 类 号：TM721[电气工程—电力系统及自动化]