A Concise Control Method Based on Spatial-Domain $dp/dv$ Calculation for MPPT / Power Reserved of PV Systems

The idea of perturbation and observation has been widely applied in PV power regulation strategies. However, the conventional Perturb and Observe (P&O) algorithm has an optimal trade-off in choosing efficient step size to balance steady-state oscillations and dynamic response. Modified P&O algorithms improve the performances but increase the computational complexity. This paper develops a concise PV control method taking $dp/dv$ as a control variable calculated in the spatial-domain. The spatial-domain $dp/dv$ calculation is based on the current moment data and the spatially adjacent data to avoids zero denominator problem. This control method achieves oscillations-free in steady-state and has a fast dynamic tracking speed with high-frequency control signal updating. Moreover, it unifies both MPPT ( $dp/dv = 0$ ) and power reserved modes ( $dp/dv < 0$ ). The simulation test system with different scenarios is established to highlight its benefits. Also, experiments on a micro-boost converter combined with a PV panel in the practical set-up are carried out to verify its effectiveness. Performance of an spatial-domain $dp/dv$ calculation based control method is compared with the popular and recent state-of-the-art methods. The satisfactory dynamic and steady-state performances show the superiority over state-of-the-art methods.