22-05-2012, 03:53 PM
Incremental Conductance MPPT With Direct Control Method Using Cuk Converter
[attachment=22747]
Problem definition
Among all renewable energy sources, solar power systems attract more attention because they provide excellent opportunity to generate electricity while greenhouse emissions are reduced
The efficiency of solar cells depends on many factors such as temperature, isolation, spectral characteristics of sunlight, dirt, shadow, and so on. Changes in isolation on panels due to fast climatic changes such as cloudy weather and increase in ambient temperature can reduce the photovoltaic (PV) array output power
In addressing the poor efficiency of PV systems, some methods are proposed, among which is a new concept called “maximum power point tracking” (MPPT)
Conventional method
Conventional MPPT systems have two independent control loops to control the MPPT. The first control loop contains the MPPT algorithm, and the second one is usually a proportional (P) or P–integral (PI) controller.
In this paper, the IncCond method with direct control is selected. The PI control loop is eliminated, and the duty cycle is adjusted directly in the algorithm.
To compensate the lack of PI controller in the proposed system, a small marginal error of 0.002 was allowed.
[attachment=22747]
Problem definition
Among all renewable energy sources, solar power systems attract more attention because they provide excellent opportunity to generate electricity while greenhouse emissions are reduced
The efficiency of solar cells depends on many factors such as temperature, isolation, spectral characteristics of sunlight, dirt, shadow, and so on. Changes in isolation on panels due to fast climatic changes such as cloudy weather and increase in ambient temperature can reduce the photovoltaic (PV) array output power
In addressing the poor efficiency of PV systems, some methods are proposed, among which is a new concept called “maximum power point tracking” (MPPT)
Conventional method
Conventional MPPT systems have two independent control loops to control the MPPT. The first control loop contains the MPPT algorithm, and the second one is usually a proportional (P) or P–integral (PI) controller.
In this paper, the IncCond method with direct control is selected. The PI control loop is eliminated, and the duty cycle is adjusted directly in the algorithm.
To compensate the lack of PI controller in the proposed system, a small marginal error of 0.002 was allowed.