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In order to improve the power quality of wind power generation system, a direct power control (DPC) strategy of open-winding brushless doubly-fed generator (BDFG) system based on dual converters is presented in this paper. The control method is divided into two parts: the grid side converter control and the machine side converter control. In terms of the grid side converter, a model predictive-based...
This paper concentrates on the control of power flow in single stage photovoltaic energy conversion system. The conversion structure has a twofold requirement that consists in ensuring that the current injected to both load and grid obeys to the grid connection standards and sets the DC bus voltage similar to the reference voltage given by the MPPT algorithm. The advanced functions that can be added...
This article presents concept, strategy and realization of primary power control for small hydraulic generators operating in autonomous, micro and minigrids. Based on field measurements and software simulations analysis on the current state of the art control strategies is made. A new improved active power control strategy is presented as suitable to overcome the main drawbacks of the current control...
This paper presents the development of a permanent-magnet synchronous generator (PMSG) with followed switch-mode rectifier (SMR) and performs its performance enhancement operation controls. First, the derated characteristics of a PMSG employing various followed AC-DC converters are comparatively assessed. Accordingly, the Vienna SMR is established and served as the interface converter of the developed...
Synchronized cutting-in control strategy and power control strategy after gird-connection of doubly-fed wind power generator is analyzed in detail. Since two different generator control systems are employed between cutting-in moment, a smooth switching strategy is presented, too. Simulating results are shown that the synchronized cutting-in control strategy adopted can meet grid connecting requirement,...
Distributed generation plays a key role in reducing CO2 emissions and losses in transmission of power. However, due to the nature of renewable resources, distributed generation requires suitable control strategies to assure reliability and optimality for the grid. Multi-agent systems are perfect candidates for providing distributed control of distributed generation stations as well as providing reliability...
The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed power control algorithm applied to PMSG is proposed, and then design the controller using tip speed radio and flux-weakening control scheme. It can not only provide a constant switching...
This paper presents a new grid-connected strategy for axial field flux-switching permanent magnet (AFFSPM) wind power generator with improved dynamic response and steady-state performance. Non-controllable convertor and grid-connected PWM rectifier are used as the structure of the main circuit. Triple-state direct power control(DPC) strategy is used on grid side to improve the accuracy of power decoupling...
This research is worked on the concept of the converter-controlled permanent magnet generator for wind power generation system. For nonlinear dynamics with unknown nonlinearities of the system, a neural network controller for achieving maximum power tracking as well as output voltage regulation for a wind energy conversion system (WECS) employing a transverse flux permanent magnet synchronous generator...
This paper presents a fully integrated single-inductor dual-output (SIDO) buck-boost or boost-boost DC-DC converter with power-distributive control. This converter works under voltage mode control to have better noise immunity, uses fewer power switches/external compensation components to reduce cost, and is thus suitable for system on chip (SoC) applications. The proposed SIDO converter was fabricated...
The scheme of the developed Switched Reluctance linear generator system is presented, which is made up of the three-phase 6/4 structure simple side Switched Reluctance linear generator and the three-phase asymmetric bridge power converter. The structure of the Switched Reluctance linear generator is described with the side elevation and the sectional drawing. The three-phase asymmetric bridge power...
Aiming at the problem to generate difficultly steady electric energy in wind solar hybrid power system (WSHGS), the management and control method based on the battery power control is discussed. The system designed in this paper realizes the control for battery intelligent charging and discharging process by the system software and PIC16F877 signal chip computer. The hardware design scheme is given...
We propose QUEST (QUality ESTimation), a new method that accurately estimates IEEE 802.11 wireless link quality with no in-band signaling overhead. Existing link quality estimation methods either are based on hello exchanges by fixing or varying transmission rates or rely on the history (e.g., delivery ratio) of previously sent data packets in a per-rate/-neighbor manner. QUEST on the other hand,...
The free piston energy converter (FPEC) is a new type of power unit for hybrid electric vehicle. In a FPEC, an internal combustion engine driven permanent magnet linear generator (PMLG) may be utilized to produce electrical energy. A three-phase active rectifier topology together with its controller is presented for controlling the generator output. The PMLG loaded with an active rectifier is modeled...
The developed switched reluctance starter/generator system in low voltage is presented, which is made up of the three-phase 12/8 structure double salient reluctance machine, three-phase asymmetric bridge single polarity power converter and the controller. The three-phase 12/8 structure double salient reluctance machine, the three-phase asymmetric bridge single polarity power converter and the control...
In this paper we discuss performance results of a novel real-time closed-loop power amplifier (PA) linearization technique that has originally been proposed by Ahmed and Li. The novel approach performs on-the-fly prediction and measurement of the PA AM/AM and AM/PM non-linearity, stores such non-linear characteristics and calculates their inverse functions in order to pre-distort the base-band amplitude...
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