基于MPPT的光伏电站并网电能质量跟踪控制系统

MPPT⁃based tracking control system for grid⁃connected power quality of photovoltaic power station

为解决在光伏并网过程中受功率震荡影响电能波动较大,电压、电流不达标的问题,实现对并网电能的准确跟踪与控制,设计基于MPPT的光伏电站并网电能质量跟踪控制系统。将单片机模块、电量脉冲跟踪检测设备接入光伏电站的并网控制电路之中,完成跟踪控制系统的硬件方案设计。基于MPPT评价指标的稳定性要求,求解功率振荡系数,定义跟踪控制任务指令,联合各级硬件应用设备,完成光伏电站并网电能质量跟踪控制。对比实验结果证明,上述控制系统的应用,可在光伏并网功率震荡条件下控制电力系统电压与标准值的差距低于60 V,电流标准差低于5 A,解决了电能波动大及电压、电流不达标的问题,可以实现对并网电能的准确跟踪与控制。

In order to solve the problem that the electric energy fluctuates greatly and the voltage and current are not up to the standard due to the power fluctuation during the photovoltaic grid connection process,and to realize the accurate tracking and control of the grid-connected electric energy,a tracking and control system for the grid-connected electric energy quality of photovoltaic power stations based on MPPT is designed.The single-chip microcomputer module and electric quantity pulse tracking and detection equipment are connected to the grid-connected control circuit of the photovoltaic power station to complete the hardware design of the tracking control system.Based on the stability requirements of the MPPT evaluation index,the power oscillation coefficient is solved,the tracking control task instruction is defined,and the tracking control of the grid-connected power quality of the photovoltaic power station is completed in combination with the hardware application equipment at all levels.The comparison experiment results show that the application of the above control system can control the difference between the voltage and the standard value of the power system to be less than 60 V and the standard deviation of the current to be less than 5 A under the condition of the photovoltaic grid-connected power oscillation,which solves the problem of large fluctuations in electric energy,and the voltage and current are not up to the standard,and can realize the accurate tracking and control of the grid-connected electric energy.