A Concise Control Method Based on Spatial-Domain dρ/dν 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.

Automated summary

The idea of perturbation and observation is widely used in PV power regulation strategies. This paper presents a concise PV control method based on spatial-domain dp/dv calculation, which avoids the trade-off problem in the conventional Perturb and Observe (P&O) algorithm. The proposed method achieves oscillation-free steady-state and fast dynamic tracking speed, and incorporates both MPPT and power reserved modes.