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- Title
The quantum‐mode regulated power point tracking in a photovoltaic array for application under the quantised converter duty ratio.
- Authors
Reddy, M. Kranthi Kumar; Sarkar, Vaskar
- Abstract
The objective of this work is to develop a realistic control technique for stably regulating the power output of a photovoltaic array. The associated process is referred to as the regulated power point tracking (RPPT). Ideally, the converter duty ratio is expected to be a continuous variable so that the photovoltaic power output can be freely adjusted. However, such a continuous‐mode RPPT is possible only with the help of an analogue pulse‐width‐modulation (PWM) control. In contrast, the modern digital PWM control causes a duty ratio quantisation. As a result, the photovoltaic power output can, practically, be adjusted only at some discrete power levels. Therefore, existing RPPT control techniques, which optimistically assume a continuous power production range, may lead to persistent low‐frequency power oscillations because of the digital PWM. To overcome the particular problem, a quantum‐mode RPPT control technique is proposed in this paper. The quantum‐mode RPPT basically limits its search only to the practically attainable discrete power levels by suitably modifying the given power reference command. Thus, the power tracking can always reach a converged state. For the faster RPPT, the perturbation step size is dynamically adapted. The proposed RPPT control technique is verified via both simulations and hardware experiments.
- Subjects
PHOTOVOLTAIC power systems; POWER distribution networks; ELECTRIC power distribution; PULSE width modulation; ELECTRIC power management
- Publication
IET Renewable Power Generation (Wiley-Blackwell), 2021, Vol 15, Issue 8, p1748
- ISSN
1752-1416
- Publication type
Article
- DOI
10.1049/rpg2.12143