| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 242509 | Applied Energy | 2015 | 12 Pages |
•A improved P&O based MPPT method for PV system is developed.•The method enhances the steady state performance of the conventional P&O.•Proposed method minimizes the probability of losing the tracking direction.•The energy yield is increased by 2% on average.•No complex computation is required and hardware implementation is very simple.
This paper proposes a method to improve the efficiency of the P&O maximum power point tracker (MPPT) by reducing the steady state oscillation and eliminating the possibility of the algorithm to lose its tracking direction. A dynamic perturbation step-size is employed to reduce the oscillation, while boundary conditions are introduced to prevent it from diverging away from the MPP. To prove its effectiveness, the proposed P&O is compared with the conventional and adaptive P&O using the Ropp, sinusoidal and ramp irradiance tests. In addition, the performances are evaluated based on a one-day (10 h) irradiance and temperature profile. The algorithm is implemented on a buck-boost converter and benchmarked by the standard MPPT efficiency (ηMPPT) calculation. It was found that, for all the tests, the ηMPPT of the proposed P&O scheme is increased by approximately two percentage points. Besides, the proposed algorithm does not require any extra hardware components; only several lines of additional software codes are to be embedded into the conventional P&O MPPT control program.
