Analysis, design and control of zero voltage switched high frequency PWM forward converters

Presents an analysis, design procedure and experimental results of a number of new high-frequency single-ended DC/DC forward converter topologies, to be used in switch-mode rectifier or off-line switch-mode power supplies

A novel control strategy for a variable speed wind turbine with a permanent magnet synchronous generator

This paper presents a novel control strategy for the operation of a direct drive permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine. The control strategy for the generator side converter with maximum power extraction is discussed. The stand alone control is featured with output voltage and frequency controller capable of handling variable load. The potential excess of power is dissipated in the damp resistor with the chopper control and the dc link voltage is maintained. Dynamic representation of dc bus and small signal analysis are presented. Simulation results show that the controllers can extract maximum power and regulate the voltage and frequency under varying wind and load conditions. The controller shows very good dynamic and steady state performance

PRZEGLĄD METOD STEROWANIA SYSTEMÓW ELEKTROWNI WIATROWYCH Z GENERATOREM SYNCHRONICZNYM O MAGNESACH TRWAŁYCH

The paper presents a review of control methods of the wind energy conversion systems with permanent magnet synchronous generator. The modern vector control methods for converter system of variable-speed wind energy conversion have been described. In order to improve the energy efficiency of wind turbine, the maximum power point tracking algorithm has been applied. To verify the effectiveness of the considered configuration and its control strategy, the selected simulation studies have been performed. The obtained study results showed the high effectiveness of the considered configuration and its control methods.W artykule przedstawiono przegląd metod sterowania elektrowni wiatrowej z generatorem synchronicznym o magnesach trwałych. Opisano nowoczesne metody sterowania wektorowego dla przekształtnikowych układów elektrowni wiatrowych. W celu zwiększenia skuteczności przetwarzania energii wiatrowej zastosowano algorytm śledzenia mocy maksymalnej. W celu sprawdzenia skuteczności rozpatrywanej topologii i metody sterowania, wybrane badania symulacyjne zostały przedstawione i omówione. Przeprowadzone badania potwierdziły prawidłowość i dużą dokładność sterowania rozpatrywanej topologii i ich metod sterowania

Applications of Switch-Mode Rectifiers on Micro-grid Incorporating with EV and BESS

A switch-mode rectifier (SMR) can provide adjustable and well-regulated DC output voltage from the available AC source with good line drawn power quality. Depending on the input/output voltage transfer characteristics, the schematics, the operation quadrant, and control, SMRs possess many classifications and application. Typical potential application examples include grid powered motor drives, battery chargers, various power electronic facilities, micro-grids, and grid-connected battery energy storage system (BESS), etc. In micro-grids, the SMR can be employed as the AC generator-followed converter to yield better generating efficiency. The SMR operation of its grid-connected inverter let the grid-to-microgrid (G2M) operation be conductable in addition to the microgrid-to-grid (M2G) operation. As for the electric vehicle (EV), the bidirectional inverter can be arranged to perform G2V/V2G operations in idle case, wherein the SMR operation is made in G2V battery charging

A Comparative Evaluation of Wave Shaping Methods for AC-DC Power Electronics Converter

Power Electronics is defined as branch of science, engineering and technology which deals with Power Electronics Modulators (PEM) in which efficient conversion, conditioning, processing, controlling and modulating the flow of large electric power using Solid State Power Semiconductor Device (SSPSD) in order to supply high quality power to the load which causes minimum pollution of physical characteristics of electric power with regulating stability and response characteristics of the closed loop system and its application. The comparative study of Passive and Active Wave Shaping (AWS) filter based on Current-Source Fed Switch Mode Rectifier (CSFSMR) converter supplied from single-phase AC supply is carried out in this paper in which two circuit are designed and implemented in MATLAB Simulink. Usually a boost converter is working as Active Harmonic Filter to reduce the harmonics at the main supply by controlling the duty cycle of the filter while Passive wave shaping filter reduce the harmonics at the supply in a simple way. Depending on rating, schematic and control complexities, control performance and cost, there are many possible power factor correction approaches. The suited and cost effective one can be chosen according to the desired performance for specific application

Driving Control Technologies of New High-Efficient Motors

Although switched-reluctance machine (SRM) possesses many structural advantages and application potential, it is rather difficult to successfully control with high performance being comparable to other machines. Many critical affairs must be properly treated to obtain the improved operating characteristics. This chapter presents the basic and key technologies of switched-reluctance machine in motor and generator operations. The contents in this chapter include: (1) structures and governing equations of SRM; (2) some commonly used SRM converters; (3) estimation of key parameters and performance evaluation of SRM drive; (4) commutation scheme, current control scheme, and speed control scheme of SRM drive; (5) some commonly used front-end converters and their operation controls for SRM drive; (6) reversible and regenerative braking operation controls for SRM drive; (7) some tuning issues for SRM drive; (8) operation control and some tuning issues of switched-reluctance generators; and (9) experimental application exploration for SRM systems: (a) wind generator and microgrid; (b) EV SRM drive

MAXIMUM POWER COEFFICIENT CONTROL OF A MICRO GRID-CONNECTED WIND ENERGY SYSTEM

This paper proposed the integration of the wind energy system (WES) with the grid consists of a wind turbine, a permanent magnet synchronous generator (PMSG), a switch-mode rectifier (SMR) and a three-phase voltage source inverter (VSI). Optimal torque control (OTC) method is applied to the converter on the generator side for maximizing the power coefficient under the change in wind speeds. To synchronize the WES with the grid, another controller is applied to keep dc-bus voltage at constant value and to regulate active and reactive power transmitted into a grid. A system of WES connected into a grid is created and tested in the MATLAB/SIMULINK platform version 2019b. Comprehensive simulation results are used to analyze and verify the excellent performance of the suggested two- control strategy on the machine and grid side