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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 presents a mid-voltage experimental voltage generator used for the testing mainly of distribution power equipment, high-power drives and renewable power generation. It utilizes thyristor-controlled zigzag transformer as its primary circuit. Based on the analysis of the operation mechanism, the voltage equations are derived and control strategy is proposed. This power electronic zigzag transformer...
In this paper the switched reluctance generator (SRG) is explored considering the improvement of its efficiency. This machine generates a DC power that is directly related to input driving parameters. Simulation results are presented bringing a case study of parametric regression to track the best efficiency for any input parameters: excitation voltage and turn off angle. A method known as parametric...
The switched reluctance type integrated starter generator (SRISG) has the potential to be applied in hybrid electric vehicles for its robust structure, and it does not feature a magnet. In this paper, a new double-gap SRISG design that can provide higher power is presented. Characteristics, such as torque ripple, charging ability, and efficiency, are investigated by both 2D and 3D finite element analysis...
This paper introduces a new transformerless converter topology for Multiphase-Based Wind Energy Conversion Systems (WECSs). In this topology, a twelve-phase induction generator is integrated to the grid using dual Nine-Switch Converters (NSCs) connected in series forming a high voltage cascaded dc-link. For this generator phase number, this topology reduces the total number of semiconductor devices...
In this paper, a high frequency linked cascaded multilevel inverter (CMLI) is presented, which brings simplicity for CMLI to connect in renewable systems and electronic vehicular applications. The requirement of multiple isolated dc-supplies and their balancing is a critical drawback in CMLI and for this reason; it is very difficult to connect a CMLI directly with any system. The utilization of multi-winding...
Integrated starter/generator based on the wound-rotor synchronous machine is becoming increasingly popular in modern aircraft due to the advantages of high safety and low cost in maintenance. In this paper, three detailed excitation control methods for the two-phase brushless exciter of a wound-rotor synchronous starter/generator in the starting mode were proposed and compared. In order to get constant...
The following work introduces the use of nine-switch converter in a multi-channel dual configuration for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when...
The following work introduces the use of a dual three-phase converter with reduced number of switches in a back-to-back configuration for its application to an open-end-winding permanent magnet synchronous generator based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual three-phase voltage source converter capable of controlling two sets of three-phase variables...
A new compound-excited doubly salient brushless dc (DSBLDC) generator with power tracking rectification is proposed, which is constituted by a doubly salient electromagnetic machine (DSEM) with split field windings and a simple switched-mode rectifier. The configuration and operation principle are introduced. The inductance features of the generator are analyzed for the utilization of series field...
The following work introduces the use of a nine-switch back-to-back topology, for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel back-to-back three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when operating...
The structure and control strategy of a novel two-phase brushless exciter were first proposed in this paper to solve the excitation problem of the main generator when three-stage brushless synchronous starter/generator starts up. Two-phase symmetrical winding was adopted as the field winding of the exciter, and was supplied with two-phase AC or DC by a two-phase inverter. This new exciter and control...
Over-voltage triggering is a trigger method for Marx generators, which omits additional wear of electrode. Hence, it is suitable for triggered long-term operation of Marx generators in industrial applications as for example electroporation of plant cells in large scale. The trigger device replaces one or both charging coils between the 1st and 2nd stage of the Marx generator and superimposes an over-voltage...
This paper introduces a new method of generator brake torque control during Fault Ride Through (FRT) drive for a multi level matrix converter of wind power system. It may be exist that a generator speed become over speed during FRT drive. In this case, a generator has to be fixed brake torque. In the past, generator brake torque control during FRT drive for a matrix converter is impossible. However,...
In order to overcome the excitation problem of three-stage synchronous machine(TSM) used as starter for the engine cranking, this paper presented a novel three-phase open-winding structure of the exciter for the proposed machine with the dual-inverter for supplying the integrated AC and DC excitation power. The operation principle of the dual-inverter and the control method of the three-phase AC excitation...
The paper presents a novel switching strategy to increase the efficiency of the switched reluctance generator at low speed. The asymmetric bridge converter that provides three switching states has been chosen. The proposed technique redistributes the three switching states of the converter within one working cycle. Such technique is viable when the switched reluctance generator operates below its...
Due to their high density of energy and low cost the inductive storages (IS) in combination with a high resource switch [1–4] have greater potential compared to the storage capacitors. Among their advantages is the generation of pulse series at high efficiency of energy transfer. In [5, 6] one of possible applications for the generators based on IS was proposed, namely generation of series of gigawatt...
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...
In order to overcome the excitation problem of the brushless synchronous machine used as starter for engine cranking in the variable frequency starter/generator system, this paper presented a novel three phase open-winding structure of the excitation generator with double inverters for supplying the integrated AC and DC excitation power to the major machine. The control strategies of three-phase AC...
The paper presents the developed Switched Reluctance linear generator system in hardware and in software. The structure and photograph of the developed three-phase 6/4 structure Switched Reluctance linear generator are given. The main circuit topology and photograph of power converter are also given. The photographs of power converter drive circuit, protection circuit, keyboard and LCD display circuit,...
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