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Power optimizer
About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.
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TL;DR: In this paper, the authors present a method to maximize the efficiency and increase the amount of extractable power of a WPT system operating in non-resonant operation, which is based on actively modifying the equivalent secondary-side load impedance by controlling the phase shift of the active rectifier and its output voltage level.
Abstract: Wireless power transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current Wireless power transfer (WPT) systems. This study presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in nonresonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phase-shift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a dc–dc converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-of-the-art solutions in terms of efficiency and extractable power.
246 citations
Patent•
10 Aug 2011
TL;DR: In this article, the converters are coupled in series and an inverter is connected in parallel with the series connection of converters and inverts a DC input to the inverter from converters into an AC output.
Abstract: A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.
243 citations
TL;DR: Two fundamental conclusions are derived from this study: (1) the buck–boost DC/DC converter topology is the only one which allows the follow-up of the PV module maximum power point regardless of temperature, irradiance and connected load and (2) the connection of a buck– boost DC/ DC converter in a photovoltaic facility to the panel output could be a good practice to improve performance.
239 citations
24 Oct 2005
TL;DR: In this article, different concepts of DC circuit breakers are presented and compared for different voltage levels and all solutions are compared under technical and economical aspects under both technical and economic aspects.
Abstract: The development of advanced transmission and distribution technologies is steadily gaining interest. Especially the large number of wind farms leads to a demand for new and innovative solutions. Considering the interconnection of offshore wind farms, new technologies must be investigated. One promising solution for an interconnection is a DC distribution system which is also discussed for new (onshore) medium-voltage distribution systems. Beside the advantages of DC distribution (low losses, no reactive power), DC has major disadvantages concerning control and switching actions. Since present circuit breakers are not able to switch large DC currents, new solutions must be found. After a brief introduction of the fundamental principles for switching DC currents, different concepts of DC circuit breakers are presented and compared in this paper. Furthermore, this analysis is accomplished for different voltage levels and all solutions are compared under technical and economical aspects.
239 citations
TL;DR: An artificial neural network-based pitch angle controller for wind turbines is proposed and it is shown that the power output was successfully regulated during high wind speed, and as a result overloading or outage of the wind turbine was prevented.
Abstract: In wind energy conversion systems, one of the operational problems is the changeability and discontinuity of wind. In most cases, wind speed can fluctuate rapidly. Hence, quality of produced energy becomes an important problem in wind energy conversion plants. Several control techniques have been applied to improve the quality of power generated from wind turbines. Pitch control is the most efficient and popular power control method, especially for variable-speed wind turbines. It is a useful method for power regulation above the rated wind speed. This paper proposes an artificial neural network-based pitch angle controller for wind turbines. In the simulations, a variable-speed wind turbine is modeled, and its operation is observed by using two types of artificial neural network controllers. These are multi-layer perceptrons with back propagation learning algorithm and radial basis function network. It is shown that the power output was successfully regulated during high wind speed, and as a result overloading or outage of the wind turbine was prevented.
238 citations