基于改进电导增量法的光伏MPPT控制

为了提高光伏发电效率及系统稳定性，需要对光伏阵列进行最大功率点跟踪（MPPT）控制。针对传统扰动观测法存在的系统振荡及误判问题，提出一种改进的电导增量法，通过计算系统当前时刻电导与电导变化率的差值，利用积分器进行调节，消除其差值，最终实现对系统最大功率点的稳定跟踪。为验证所提算法的有效性，将改进电导增量法与传统扰动观测法进行仿真对比，结果表明改进算法控制的光伏系统输出功率在满足跟踪速度的基础上，减小了系统母线电压变化的振荡幅度，使系统能够稳定准确地跟踪最大功率点，提高了光伏电池的利用率。

Photovoltaic MPPT Control Based on Improved Conductance Increment Method

In order to improve the efficiency of photovoltaic power generation and system stability， it is necessary to control maximum power point tracking （MPPT） of PV array. In view of the system oscillation and misjudgment in traditional disturbance observation method，an improved incremental conductance method is put forward through calculating the current moment conductance and differential conductance rate. The integrator is used to adjust and eliminate the difference. Finally，the maximum power point of the system can be tracked stably. To verify the validity of the proposed algorithm， the improved incremental conductance method simulation is compared with traditional disturbance observation method. The results show that the output power of photovoltaic system contolled by the improved algorithm can reduce the oscillation amplitude of system busbar voltage change，make the system stablely and accurately track the maximum power point，increase the utilization rate of photovoltaic cells on the basis of satisfying the tracking speed.