基于虚拟直流发电机的光伏系统控制策略

发布时间：2018-02-03 20:53

本文关键词： 虚拟直流发电机光伏系统直流微网双级控制分层控制　出处：《高电压技术》2017年07期 　论文类型：期刊论文

【摘要】：为了消除了光照强度、负荷等突然变化对光伏系统的影响,并提高光伏系统运行的稳定性与抗扰性,本文在分析虚拟直流发电机(VDG)原理与优势的基础上,采用了将虚拟直流发电机应用到光伏系统控制策略中,由此构成光伏系统的MPPT+VDG双级控制策略,并把该控制策略应用于直流微网中的方法。Matlab/Simulink仿真结果表明,当负荷、光照强度分别发生突变时,采用MPPT+VDG双级控制的光伏系统的母线电压的波动幅值为55 V、71 V,明显小于MPPT控制的光伏系统的母线电压的波动幅值97 V、101 V,与此同时含有双级控制光伏系统的直流微网在负荷、光照强度分别发生突变时的母线电压波动大小为26.7 V、17.7 V,小于普通控制的直流微网的母线电压波动28.5 V、20 V,而且蓄电池切换次数为2次、0次也明显小于普通控制时蓄电池切换次数4次、2次。由仿真结果可知本文所提的控制策略能够提高光伏系统运行的稳定性与抗扰性。
[Abstract]:In order to eliminate the impact of sudden changes of light intensity and load on photovoltaic system, and improve the stability and immunity of photovoltaic system. Based on the analysis of the principle and advantage of VDG, the virtual DC generator is applied to the control strategy of photovoltaic system. Thus, the MPPT VDG two-stage control strategy of photovoltaic system is constructed, and the control strategy is applied to DC microgrid. The simulation results of Matlab / Simulink show that when the load is applied. The fluctuation amplitude of bus voltage of photovoltaic system with MPPT VDG two-stage control is 55V / 71V when the light intensity changes respectively. The fluctuation amplitude of bus voltage of photovoltaic system controlled by MPPT is 97 V / 101V, at the same time, the DC microgrid load of two-stage controlled photovoltaic system is at the same time. The voltage fluctuation of bus is 26.7 V / 17.7 V when the light intensity changes respectively, which is less than 28.5 V ~ (20 V) of the conventional DC microgrid. And the battery switching times of 2 times and 0 times is obviously smaller than the ordinary control battery switching times of 4 times. The simulation results show that the proposed control strategy can improve the stability and immunity of photovoltaic system.
【作者单位】：上海电力学院自动化工程学院;上海市电站自动化技术重点实验室;
【基金】：国家自然科学基金(61573239) 上海市重点科技攻关计划(14110500700) 上海市电站自动化技术重点实验室(13DZ2273800) 上海市自然科学基金(15ZR1418600)~~
【分类号】：TM615
【正文快照】： 0引言1随着全球经济的发展,能源与环境问题日益成为各个国家所要考虑的主要问题之一,而解决这两个问题最有效的策略是全力发展可再生能源。在各种可再生能源中太阳能无疑是最重要的能源之一,Station Automation Technology Laboratory(13DZ2273800),Natural Sci-ence Foundati

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