Power optimizer

About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.

Comparison of direct maximum power point tracking algorithms using EN 50530 dynamic test procedure

Abstract: Three direct maximum power point tracking (MPPT) algorithms with non-adaptive voltage step are evaluated in the light of their performance for photovoltaic systems under dynamic conditions for a resistive load. A microcontroller-based buck–boost DC–DC converter platform is used to implement and compare the algorithms. Dynamic test procedures from a new standard for inverter efficiency determination EN 50530 were implemented to evaluate dynamic MPPT algorithms’ efficiency and their dependence.Experimental results show that MPPT algorithms’ regulating frequency and regulating voltage step play a crucial role in the dynamic performance of direct algorithms. A range of regulating frequencies and voltage steps were examined. If proper parameter values are chosen, all algorithms perform well and close to each other. Detailed evaluation was performed with determining partial MPPT efficiency under different irradiance slopes. Results show that at least 10 Hz should be used to satisfy the 99% tracking efficiency over all slopes in the range from 0.5 to 100 W/m2/s as specified by EN 50530 standard. Further increase of regulating frequency would result in higher slope efficiency only at dynamic conditions.

Design of a minimum weight dual active bridge converter for an Airborne Wind Turbine system

Abstract: The design procedure for a bidirectional DAB dc-dc converter, which provides a high dc voltage of 8kV to the tether of a 100 kW Airborne Wind Turbine (AWT) system, is presented. The maximum allowed weight of the dc-dc converter is 25 kg and, thus, the main challenge is the realization of a light-weight DAB converter. The investigated dc-dc converter is split up into 16 single DAB modules with a rated power of 6.25 kW and a dc port voltage of 2kV. Thus, a weight of less than 25 kg/16 = 1.56 kg needs to be achieved for a single DAB module. The design method used to obtain the minimum weight DAB converter, based on the evaluation of a power-to-weight ratio versus efficiency Pareto Front γ-η-Pareto Front) is presented in this paper. For this purpose the transient voltages and currents of the employed SiC JFETs during switching are discussed in detail, since the respective measurement results allow for a prediction of the switching losses. Moreover, the calculated transformer is realized and experimental results are used to verify the weight, the losses, and the cooling system performance of the transformer. For a single DAB module a weight of m = 1.43 kg, an efficiency of η = 97%, and a power-to-weight ratio of γ = 4.4kW/kg results.

Maximum power point tracking of solar photovoltaic system using modified perturbation and observation method

Abstract: Solar energy is one of the important renewable energy resources as it is pollution free, clean, never-ending and abundant. Solar photovoltaic technologies are mounting vigor attention in the modern electrical power applications due to fast growth in the relative sectors of semiconductor and power electronics. It is significant to operate solar photovoltaic energy conversion systems to its maximum power output to raise the efficiency. Maximum power point tracking plays a very important role for extracting maximum power from the solar photovoltaic module and transferring that power to the load. The present work highlights a survey on perturb and observe method maximum power point tracking technique for solar photovoltaic system undertaken by considering the various works already listed relative study has been carried out, which includes different perturb and observe method on maximum power point tracking techniques and draw their advantages and drawbacks. These techniques vary in many aspects, which can be broadly categorized on the basis of simplicity, way of implementing, type of sensors, total cost of the system, range of effectiveness, hardware requirement and speed of convergence. It is expected that this review work will provide precious information for solar photovoltaic professionals to keep alongside with the latest progress in this area, as well as for new researchers to get started on maximum power point tracking.

Distributed low-complexity controller for wind power plant in derated operation

Abstract: We consider a wind power plant of megawatt wind turbines operating in derated mode. When operating in this mode, the wind power plant controller is free to distribute power set-points to the individual turbines, as long as the total power demand is met. In this work, we design a controller that exploits this freedom to reduce the fatigue on the turbines in the wind power plant. We show that the controller can be designed in a decentralized manner, such that each wind turbine is equipped with a local low-complexity controller relying only on few measurements and little communication. As a basis for the controller design, a linear wind turbine model is constructed and verified in an operational wind power plant of megawatt turbines. Due to limitations of the wind power plant available for tests, it is not possible to implement the developed controller; instead the final distributed controller is evaluated via simulations using an industrial wind turbine model. The simulations consistently show fatigue reductions in the magnitude of 15-20%.