直流微电网中光伏发电系统的比例-积分-谐振控制

发布时间：2019-01-25 09:19

【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。
[Abstract]:When DC microgrid drives single-phase AC inverter load, DC voltage will produce periodic fluctuation of double frequency, which will result in periodic fluctuation of output power of connected photovoltaic power system, which can not be sustained at the maximum power output point. Thus, the efficiency of power generation is reduced indirectly. In order to solve the above problems, based on the analysis of the output power characteristics of photovoltaic power system under the periodic disturbance of DC voltage, a proportional integral-resonant control strategy is proposed for the output current of photovoltaic power generation system. The proportional-integral regulator is used for steady-state static error control of current, while the resonant controller is used to suppress periodic disturbance. The effects of the steady-state error, the stability, the variation of control parameters on the current control performance and the suppression effect of DC voltage fluctuation are analyzed in detail. The selection principle of each parameter is given. The simulation and experimental results verify the correctness and feasibility of the theoretical analysis and the proposed method.
【作者单位】：哈尔滨工业大学电气工程及自动化学院;天津工业大学电气工程与自动化学院;
【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)~~
【分类号】：TM615.2

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