Papers by Keyword: Maximum Power Point Tracking (MPPT)

Abstract: In recent days environmental pollution has become a severe problem for the mankind. Many of the scientists are conducting various researches to find out the possible measures for environment safety. Among the very serious problems growing rapidly along with the technology is the need of utilizing the solar energy before the fossil fuels get vanished. The main factors are considered as irradiance, temperature. Further a control method is surely needed for the solar energy conversion system as its efficiency changes rapidly with climate changes. In this paper the solar arrays are controlled by maximum power point tracking system (MPPT) along with the high frequency dc-dc converter.

Abstract: This paper demonstrates the implementation of P&O MPPT controller. The proposed controller was written and compiled in mikroC and later incorporated to a low cost PIC18F4550 microcontroller. Open loop simulation using Proteus Isis was conducted to test the effectiveness of the proposed algorithm. Results obtained from simulation proved the effectiveness of the proposed controller making it suitable for hardware implementation.

Abstract: The maximum output power of a photovoltaic (PV) system with a DC-DC converter depends mainly on the solar irradiance (G) and the temperature (T). Therefore, a maximum power point tracking (MPPT) mechanism is required to improve the overall system. The conventional MPPT approaches such as the perturbation and observation (P&O) technique have difficulty in finding true maximum power point. Thus various intelligent MPPT systems such as fuzzy logic controllers (FLC) are recently introduced. In FLC based MPPT, selecting the type of the membership function (MF) and the number of the fuzzy sets (FS) is critical for better performance. Thus, in this paper various adaptive neuro fuzzy inference system (ANFIS) is utilized to automatically tune the FLC membership functions instead of adopting the trial and error method. To find suitable MF for FLC, ANFIS is developed in MATLAB/Simulink and the effect of different types MF investigated. Simulation result shows that the FLC with triangular MF and seven FS give the best result. The evaluation indices used in this study includes the maximum extracted energy, minimum standard deviation of the error, and minimum mean square error.

Abstract: With the increasing application of Photovoltaic (PV) power system, it is important to make PV system always achieve its maximum power output, so maximum power point tracking (MPPT) technique develops. Based on Support Vector Regression (SVR) and Genetic Algorithm (GA), a novel MPPT method is proposed in this paper. The SVR model uses the solar radiation and temperature as two inputs, and uses the voltage at maximum power point (MPP) as output. Furthermore, GA is introduced to search the best parameters for SVR. Results validate the effectiveness of the proposed MPPT method.

Abstract: Belongs to sub-tropical zone marine climate, the Matsu islands are strongly affected by ocean monsoon and have plentiful wind power with average speed of 4.1-6.3 m/s. According to experiences of vertical-axis wind turbine, MDU has granted the bid of Matsu government’s “Low-Carbon Emission LOHAS (Lifestyles of Health And Sustainability)-type Vacation Islands” project to install two 4kW such generators: all composite patented blades’ design; new design and fabricated generators; remote monitor and merging network. The six-month test after completion of project shows the good efficiency of the whole wind-power generator system, and thus meets the custom’s specifications and also verifies the superiority of our wind turbines.

Abstract: The maximum power point tracking (MPPT) for the small-scale wind power generator systems is a hot research topic. We presented a novel solution for MPPT in 2013 that eliminates the disadvantages of conventional methods, such as low reliability and high loss. The wind power generator system is able to track maximum power automatically without using converters and control circuits. This paper mainly discusses the design method for this novel generator. A prototype has been designed and manufactured, and simulations and experiments have validated the generator system concept.

Abstract: In view of solar arrays applied in large-scale stratospheric airship, modular thinking was proposed by reasonable decomposition of solar array to design composite maximum power point tracking (MPPT) controller where the input and output are both in parallel, which ensures maximized solar energy output on a limited area. And each solar array sub-model was equipped with independent MPPT controller to control power tracking separately. Then, the solar array composed of three sub-models was used for simulation and its result indicates that MPPT controller of each sub-model can track the power quickly, and the output power can reach 93% of maximum input power when the efficiency loss of converter in reality is not considered . So, the model constructed in this paper can be used to optimize the design and analyze output characteristics quantitatively for the large-scale stratospheric airship's solar array.

Abstract: This paper investigates the quasi Z-source cascaded multilevel inverter for a photovoltaic system with maximum power point tracking. The main advantage of quasi z-source configuration is that it has boost characteristics and inversion capability in a single stage avoiding complexity of having a number of converter stages thereby increasing the efficiency. Also it has continuous input characteristic which makes it best suitable for PV applications. Perturb and Observe (P&O) algorithm has been chosen for tracking the maximum power point of the PV source. Five level cascaded inverter with quasi - impedance network powered by PV sources has been considered in this paper. Maximum constant boost control technique has been implemented for controlling the shoot-through period of the inverter. Simulation of the proposed topology has been carried out in Matlab/Simulink and performance parameters have been calculated and the results are verified.

Abstract: The utility model provides a transmission line on-line monitoring system powered devices, including power generation systems, and power control systems; power system consists of solar panels and batteries composed of the power control system consists of DC-DC converter circuit, voltage and current sampling circuit, microcontroller system and charge-discharge circuit; power control system with maximum power point tracking (Maximum Power Point Tracking: MPPT) control the power output of solar panels; the utility model role is: to improve the transmission line on-line monitoring system for solar energy utilization efficiency , extended battery life, providing a steady continuous power for outdoor transmission line online monitoring system.

Abstract: In power system analysis, the large PV station cannot be simply considered as the load, while the dynamic behavior of power electronic circuit must be considered. In response to this question, the dynamic model of PV generation unit and the dynamic equivalent strategy of large PV station are described. The dynamic model of a real large PV system and associated simulation results based on the real-time digital simulator (RTDS) are also given. The work of this paper is valued to closed loop testing of new protection and controller adapted to power system with high renewable energy penetration.