Abstract
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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dp/dv$</tex-math></inline-formula> as a control variable calculated in the spatial-domain. The spatial-domain <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dp/dv$</tex-math></inline-formula> 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 ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dp/dv = 0$</tex-math></inline-formula> ) and power reserved modes ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dp/dv < 0$</tex-math></inline-formula> ). 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dp/dv$</tex-math></inline-formula> 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.
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