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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.


Papers
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Proceedings ArticleDOI
12 Nov 2012
TL;DR: In this paper, a single-phase cascaded H-bridge multilevel inverter for a grid-connected photovoltaic (PV) system with nonactive power compensation is presented.
Abstract: A single-phase cascaded H-bridge multilevel inverter for a grid-connected photovoltaic (PV) system with nonactive power compensation is presented in this paper. To maximize the solar energy extraction of each PV string, an individual maximum power point tracking (MPPT) control scheme is applied, which allows the independent control of each dc-link voltage. A generalized nonactive power theory is applied to generate the nonactive current reference. Within the inverter's capability, the local consumption of nonactive power is provided to realize power factor correction. A single-phase modular cascaded multilevel inverter prototype has been built. Each H-bridge is connected to a 195 W solar panel. Simulation and experimental results are presented to validate the proposed ideas.

53 citations

Patent
29 Dec 2005
TL;DR: A transformerless power conversion circuit is interconnected with an electric grid and converts an input DC power provided by a power generator into an AC power and feeding the AC power into the grid as discussed by the authors.
Abstract: A transformerless power conversion circuit is interconnected with an electric grid and converts an input DC power provided by a power generator into an AC power and feeding the AC power into the grid. The power conversion circuit includes a buck-boost converter converting the input DC power into two sets of DC power levels; and at least one half-bridge inverter converting the two sets of DC power levels into the AC power for feeding into the grid. The isolating transformer can be eliminated and the common ground problem for DC side and AC side is also solved. The power conversion circuit has significant improvement for device size, manufacture cost and conversion efficiency.

53 citations

Journal ArticleDOI
TL;DR: In this article, a comparison between two power point tracker algorithms, Perturb Observe and Conductance-Increment, for the power optimization of a photovoltaic generator (PVG) is made.

53 citations

Journal ArticleDOI
TL;DR: A simple ac-dc pulsewidth-modulation converter that can perform isolated dc-dc conversion while shaping the input current to improve power factor and its ability to meet EN61000-3-2 Class D standards for electrical equipment is shown.
Abstract: A simple ac-dc pulsewidth-modulation (PWM) converter that can perform isolated dc-dc conversion while shaping the input current to improve power factor is proposed in this paper. The converter is almost the same as a standard PWM full-bridge converter with a diode rectifier/LC low-pass filter input except for some slight modifications. The converter topology is, therefore, very simple, as is the method of control used to achieve both power-factor correction and dc-dc conversion. In the paper, the operation of the converter is explained and analyzed, and the converter's steady-state characteristics are discussed. A design procedure for the selection of components is presented, and then demonstrated with an example. The feasibility of the converter, and its ability to meet EN61000-3-2 Class D standards for electrical equipment is shown with results obtained from an experimental prototype.

53 citations

Journal ArticleDOI
TL;DR: The proposed integral compensation control of the wind turbines can optimize two conflicting objectives: maximizing wind energy capture at different wind speeds and regulating the rotor speeds of wind turbines as kinetic energy storage devices.
Abstract: This paper proposes a wind-wave farm system with a self-energy storage capability and a smoothed total power output. The fluctuating electrical power from wave is smoothed by utilizing the rotor inertias of the wind turbines as short-term energy storage devices, thus without extra energy storage hardware the investment and maintenance cost of the wave energy conversion is reduced. This is achieved based on the fact that the wind power can be viewed as constant during a typical wave period (5~12 s). The proposed integral compensation control of the wind turbines can optimize two conflicting objectives: maximizing wind energy capture at different wind speeds and regulating the rotor speeds of wind turbines as kinetic energy storage devices. It enables the turbine speed to swing around its optimum points at different wind speeds. Consequently, the total power output of the wind-wave farm is well smoothed at a marginal cost of the power take-off efficiency loss. RTDS simulations and quantitative analysis are presented to demonstrate the proposed system. To demonstrate its superiority, the proposed control method is compared with the direct compensation of the wave power based on the existing maximum power point tracking method.

53 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202363
2022144
202112
202017
201924
201850