Topic
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 article, the authors proposed a new coordinated control strategy for large-scale offshore wind power integration to main grids over a long distance, which uses the electrical energy stored in the DC capacitors and the kinetic energy storing in wind turbine rotors to emulate the inertia of synchronous generators.
78 citations
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TL;DR: In this paper, a non-isolated, high boost ratio dc-dc converter with the application for photovoltaic (PV) modules is presented, which utilizes a hybrid transformer to incorporate the resonant operation mode into a traditional high-boost ratio active-clamp coupled-inductor pulse-width-modulation dc-DC converter, achieving zero-voltage switching (ZVS) turn-on of active switches and zero-current-switching turn-off of diodes.
Abstract: This paper presents a nonisolated, high boost ratio dc-dc converter with the application for photovoltaic (PV) modules. The proposed converter utilizes a hybrid transformer to incorporate the resonant operation mode into a traditional high boost ratio active-clamp coupled-inductor pulse-width-modulation dc-dc converter, achieving zero-voltage-switching (ZVS) turn-on of active switches and zero-current-switching turn-off of diodes. As a result of the inductive and capacitive energy being transferred simultaneously within the whole switching period, power device utilization (PDU) is improved and magnetic utilization (MU) is optimized. The improved PDU allows reduction of the silicon area required to realize the power devices of the converter. The optimized MU reduces the dc-bias of magnetizing current in the magnetic core, leading to smaller sized magnetics. Since the magnetizing current has low dc-bias, the ripple magnetizing current can be utilized to assist ZVS of main switch, while maintaining low root-mean-square (RMS) conduction loss. The voltage stresses on the active switches and diodes are maintained at a low level and are independent of the wide changing PV voltages as a result of the resonant capacitor in series in the energy transfer loop. The experimental results based on 250 W prototype circuit show 97.7% peak efficiency and system CEC efficiencies greater than 96.7% over 20 to 45 V input voltages. Due to the high efficiency over wide power range, the ability to operate with a wide variable input voltage and compact size, the proposed converter is an attractive design for PV module applications.
78 citations
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TL;DR: In this paper, an adaptive maximum power point tracking (MPPT) algorithm was proposed for small-scale wind energy conversion systems (WECSs) to harvest more energy from turbulent wind.
Abstract: This paper presents an adaptive maximum power point tracking (MPPT) algorithm for small-scale wind energy conversion systems (WECSs) to harvest more energy from turbulent wind. The proposed algorithm combines the computational behavior of hill climb search, tip speed ratio, and power signal feedback control algorithms for its adaptability over wide range of WECSs and fast tracking of maximum power point. In this paper, the proposed MPPT algorithm is implemented by using buck–boost featured single-ended primary inductor converter to extract maximum power from full range of wind velocity profile. Evaluation of the proposed algorithm is done on a laboratory-scaled dc motor drive-based WECS emulator. TMS320F28335, 32-bit floating point digital signal controller, is used to execute the control schemes of the in-lab experimental setup. Experimental results show that tracking capability of the proposed algorithm under sudden and gradual fluctuating wind conditions is efficient and effective.
78 citations
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24 Dec 2012TL;DR: A new single dc-bus collector bus bar CHB is proposed for a multistring LS-PECS configuration that allows inherent balanced operation of the CHB while fully decoupling the multistrings PV-system from the grid tie inverter.
Abstract: Large-scale photovoltaic energy conversion systems (LS-PECS) are currently well into the megawatt range Therefore multilevel converters have been proposed as an attractive solution due to medium voltage operation, higher efficiency, power quality, and possibility to connect PV strings separately to each dc-link However, the latter advantage makes the inverter susceptible to severe voltage unbalances due to the inherent power unbalance produced by the individual maximum power point tracking (MPPT) of the PV strings This is particularly the case of the cascaded H-bridge inverter (CHB) where power cell and phase unbalances occur In this work a new single dc-bus collector bus bar CHB is proposed for a multistring LS-PECS configuration The operation with a single dc-bus is enabled by adding an isolation dc-dc converter stage to each power cell of the CHB This allows inherent balanced operation of the CHB while fully decoupling the multistring PV-system from the grid tie inverter This also greatly extends the operating range of the system compared to previous solutions Simulation results for a 33kV 7-level CHB tested under dynamic conditions are presented and serve as a preliminary validation of the configuration and control schemes
78 citations
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TL;DR: In this paper, a number of important practical extensions to the basic?uk converter are presented, including dc isolation, multiple-output power sources, and a physical realization of the dc-to-dc transformer, a device which converts from pure dc (no voltage or current ripple) at one terminal, to pure dc at a different voltage at the other terminal.
Abstract: A number of important practical extensions to the basic ?uk converter are presented. They include dc isolation, multiple-output power sources, and a physical realization of the sought for hypothetical dc-to-dc transformer, a device which converts from pure dc (no voltage or current ripple) at one terminal, to pure dc (at a different voltage) at the other terminal. The application of the circuit in a highly efficient amplifier for the servo control of a dc motor or other loads is also presented.
78 citations