Topic
Maximum power principle
About: Maximum power principle is a research topic. Over the lifetime, 14152 publications have been published within this topic receiving 207723 citations.
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03 Aug 1992
TL;DR: An improved portable electric hand tool that has two rechargeable battery packs in the body thereof that can be selectively connected to the motor in series to provide maximum power or having only one of the batteries connected to motor for less power mode is described in this article.
Abstract: An improved portable electric hand tool that has two rechargeable battery packs in the body thereof that can be selectively connected to the motor in series to provide maximum power or having only one of the batteries connected to the motor for less power mode.
514 citations
TL;DR: In this paper, an intelligent maximum power extraction algorithm is developed by the authors to improve the system performance and to facilitate the control implementation, where an advanced hill-climb searching method is developed to take into account the wind turbine inertia.
Abstract: This paper focuses on the development of maximum wind power extraction algorithms for inverter-based variable speed wind power generation systems. A review of existing maximum wind power extraction algorithms is presented in this paper, based on which an intelligent maximum power extraction algorithm is developed by the authors to improve the system performance and to facilitate the control implementation. As an integral part of the max-power extraction algorithm, advanced hill-climb searching method has been developed to take into account the wind turbine inertia. The intelligent memory method with an on-line training process is described in this paper. The developed maximum wind power extraction algorithm has the capability of providing initial power demand based on error driven control, searching for the maximum wind turbine power at variable wind speeds, constructing an intelligent memory, and applying the intelligent memory data to control the inverter for maximum wind power extraction, without the need for either knowledge of wind turbine characteristics or the measurements of mechanical quantities such as wind speed and turbine rotor speed. System simulation results and test results have confirmed the functionality and performance of this method.
507 citations
TL;DR: An improved maximum power point tracking with better performance based on voltage-oriented control (VOC) is proposed to solve a fast-changing irradiation problem andSimulations and experimental results demonstrate that the proposed method provides effective, fast, and perfect tracking.
Abstract: In this paper, an improved maximum power point (MPP) tracking (MPPT) with better performance based on voltage-oriented control (VOC) is proposed to solve a fast-changing irradiation problem. In VOC, a cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous orthogonal d,q frame using a decoupled feedback control. The reference current of proportional-integral (PI) d-axis controller is extracted from the dc-side voltage regulator by applying the energy-balancing control. Furthermore, in order to achieve a unity power factor, the q-axis reference is set to zero. The MPPT controller is applied to the reference of the outer loop control dc voltage photovoltaic (PV). Without PV array power measurement, the proposed MPPT identifies the correct direction of the MPP by processing the d-axis current reflecting the power grid side and the signal error of the PI outer loop designed to only represent the change in power due to the changing atmospheric conditions. The robust tracking capability under rapidly increasing and decreasing irradiance is verified experimentally with a PV array emulator. Simulations and experimental results demonstrate that the proposed method provides effective, fast, and perfect tracking.
500 citations
TL;DR: In this paper, the authors outline the fundamentals of the methods of exergy analysis and entropy generation minimization (or thermodynamic optimization) subject to finite-size constraints and specified environmental conditions, and illustrate the accounting for exergy flows and accumulation in closed systems, open systems, heat transfer processes, and power and refrigeration plants.
Abstract: This paper outlines the fundamentals of the methods of exergy analysis and entropy generation minimization (or thermodynamic optimization—the minimization of exergy destruction). The paper begins with a review of the concept of irreversibility, entropy generation, or exergy destruction. Examples illustrate the accounting for exergy flows and accumulation in closed systems, open systems, heat transfer processes, and power and refrigeration plants. The proportionality between exergy destruction and entropy generation sends the designer in search of improved thermodynamic performance subject to finite-size constraints and specified environmental conditions. Examples are drawn from energy storage systems for sensible heat and latent heat, solar energy, and the generation of maximum power in a power plant model with finite heat transfer surface inventory. It is shown that the physical structure (geometric configuration, topology) of the system springs out of the process of global thermodynamic optimization subject to global constraints. This principle generates structure not only in engineering but also in physics and biology (constructal theory). Copyright © 2002 John Wiley & Sons, Ltd.
494 citations
TL;DR: In this article, a ripple correlation control (RCC) method is proposed for tracking the maximum power point of photovoltaic arrays, which takes advantage of the signal ripple, which is automatically present in power converters.
Abstract: A dynamically rapid method used for tracking the maximum power point of photovoltaic arrays, known as ripple correlation control, is presented and verified against experiment The technique takes advantage of the signal ripple, which is automatically present in power converters The ripple is interpreted as a perturbation from which a gradient ascent optimization can be realized The technique converges asymptotically at maximum speed to the maximum power point without the benefit of any array parameters or measurements The technique has simple circuit implementations
482 citations