Design and implementation of flyback MPPT converter for PV-applications (original) (raw)

Research on MPPT for Solar Cells Based on Flyback Converter

—A voltage source and rheostat are successfully used to simulate the solar cell's character in this paper. Its feasibility is analyzed theoretically. The basic principle of the maximum power point tracking (MPPT) is described. An improved disturbance method with variable-voltage step is introduced. It inherits the advantages of traditional disturbance voltage method, overcomes the shortcomings of slow response of traditional method, reduces the power loss caused by maximum power point due to continuous disturbance, and realizes the maximum power point tracking for solar cells. The proposed method improves the system's speed and efficiency. The experimental results show that the system can track the maximum power point accurately and quickly.

An Improved MPPT Converter Using Current Compensation Method for PV-Applications

The use of renewable energy is experiencing a significant growth in the world. With the increasing demand for electric power mainly for the needs of remote and deserted and mountainous regions, the photovoltaic systems, particularly telecommunications and water pumping systems, begin founding great applications. The proposed study involves a comparison between the delivered power optimization techniques. Among all, there is the technique of truly maximum power point tracking method, and the optimization techniques with and without sunlight compensation. The last two techniques are less efficient than the first one, but easier in their implementation. In order to increase their performance, an improvement has been proposed. The obtained results are promising and very satisfactorily. Indeed, the true MPPT command gives high powers, compared to other MPPT commands, but its implementation is difficult in design. To get around this problem, it seemed useful to look for other alternative commands that respond to the challenges of the desired reliability and the expected complexity. In fact, the improved " with and without sunlight compensation " command responds perfectly to the compromise of the desired implementation simplicity and the high productivity. Actually, both studied MPPT commands have been perfectly and carefully improved, the analyzes proved that the MPPT with sunlight compensation improved command reaches very high powers, equal to that delivered by the true MPPT. In this case, the suggested correction takes into consideration the variations of temperature. Another case defines a third technique which is the command without variation of sunlight, this latter takes into consideration the variations of the voltage at the bounds of the GPV generator. These MPPT commands less complex and highly interesting can certainly find a use and an involvement in photovoltaic PV systems.

Flyback Inverter Controlled by Sensorless Current MPPT for Photovoltaic Power System

—This paper presents a flyback inverter controlled by sensorless current maximum power point tracking (MPPT) for a small photovoltaic (PV) power system. Although the proposed system has small output power such as 300 W, a few sets of small PV power systems can be easily connected in parallel to yield higher output power. When a PV power system is constructed with a number of small power systems, the total system cost will increase and will be a matter of concern. To overcome this difficulty, this paper proposes a PV system that uses no expensive dc current sensor but utilizes the method of estimating the PV current from the PV voltage. The paper shows that the application of this novel sensorless current flyback inverter to an MPPT-operated PV system exhibits satisfactory MPPT performance similar to the one exhibited by the system with a dc current sensor as well. This paper also deals with the design method and the operation of the unique flyback inverter with center-tapped secondary winding. Index Terms—Digital signal processors, photovoltaic (PV) power systems, pulsewidth-modulated (PWM) inverters.

Performance of Active Clamp and Interleaved Active Clamp Fly back DC-DC Converters for PV Systems

The Flyback converter topology is a well-known and widely used for AC-DC and DC-DC power converters that cover a broad-spectrum including switching power supplies, photovoltaic (PV) system, electric cars, and fuel cell-based generation systems, and among other applications. In this work, Active Clamp Flyback (ACF) and Interleaved Active Clamp (IACF) converters are designed and simulated for the use of DC-DC converters of PV system applications. Two control systems are used to control the output voltage of the DC-DC converters for various PV conditions, which are PID (proportional integral derivatives) and FLC (fuzzy logic controller). MATLAB/SIMULINK is used to model and simulate the proposed system, where the proposed control systems are developed to regulate the output voltage for the load requirements. The simulation results of the proposed PV systems indicate that the output voltage stabilizes effectively to the required voltage (24 V) for various loads/applications while the in...