scholarly journals Hybrid Control for Bidirectional Z-Source Inverter for Locomotives

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Vasanthi Vijayan ◽  
S. Ashok
Keyword(s):  
Control Method ◽  
Hybrid Control ◽  
Modulation Index ◽  
Voltage Source ◽  
Small Scale ◽  
Voltage Source Inverters ◽  
Variable Voltage ◽  
Three Phase ◽  
Voltage Stress ◽  
Electric Traction

Electric traction uses three phase locomotives in main line services. Three phase locomotives consist of voltage source inverters for driving the traction motors. This paper proposes a hybrid algorithm for bidirectional Z-source inverters in accelerating region of operation of locomotives. The speed control method adopted is same as that in the existing three phase locomotives which is variable voltage variable frequency. Bidirectional Z-source inverter is designed for getting the same output power as in voltage source inverter fed locomotives. Simulation is done in all regions of traction speed curve, namely, acceleration, free running, and braking by regeneration. The voltage stress across the devices and modulation index are considered while analyzing the proposed control algorithm. It is found that the modulation index remains at a high value over the entire range of frequencies. Due to the higher value of modulation index the harmonics in the inverter output voltage is reduced. Also the voltage stress across devices is limited to a value below the device rating used in the present three phase locomotives. A small scale prototype of the bi-directional Z-source inverter fed drive is developed in the laboratory and the hybrid control was verified in the control topology.

scholarly journals Non isolated coupled converter tied voltage source inverter drive

2019 ◽  
Vol 10 (2) ◽  
pp. 645
Author(s):  
A. Suresh Kumar ◽  
R. K. Pongiannan ◽  
C Bharatiraja ◽  
Adedayo Yusuff ◽  
N Yadaiah
Keyword(s):  
Short Circuit ◽  
High Gain ◽  
Voltage Source ◽  
Small Scale ◽  
Motor Drive ◽  
Power Circuit ◽  
Voltage Source Inverters ◽  
Ac Motor ◽  
Three Phase ◽  
Power Quality Disturbance

<span>The voltage source inverters (VSI) are ever required section in the AC motor drive and power system interface. The electrical drive segment, the VSI based drives are unavoidable and they are closely operated with induction motor, permanent magnate synchronous motor and BLDC motor. These drives are normally needed high torque-power characters. Hence, the input DC-link side voltage is increased with help of increasing input AC in the rectifier input. However, this causes the power quality disturbance in the AC main and DC-link. In order to go for a increasing the AC voltage, the rectifier out is connected with DC to DC boost converter and they are increasing the DC voltage to meet out the drive DC-link voltage demand. With this aim, the paper proposes the idea to connect high step non-isolated high gain coupled DC to DC converter with three phase VSI for drives applications. The proposed converter has an ability to increase the voltage five times and the counter winding arrangement ratio of the converter is help for the further increase of gain. Inn this interface the front end DC to DC converters inductors are charged by making the short circuit with inverter switching. The converter voltage gain is controlled by shoot through of the VSI switch (converter gain directly proportional to inverter shoot through). The proposed converter has a higher degree of freedom in their values of winding and output voltage. Hence, the DC-link voltage of the inverter can be extended in any level. The operation principle and modes of the proposed DC to DC Source tied VSI is analyzed and simulated using MATLAB-Simulink software simulation.  The laboratory based small scale power circuit is developed with help of control algorithm. The entire implementation is done through PIC microcontroller platform. The deign Investigation, system simulation and experimentation confirming the proposed DC to DC converter tied VSI drive system.</span>

scholarly journals Grid Connected Energy System four leg Inverter for DC Voltage and Power Improvement

IJOSTHE ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 4
Author(s):  
Yogeeta Hurde ◽  
Nandkishor .
Keyword(s):  
Power Systems ◽  
Single Phase ◽  
Control Method ◽  
Energy System ◽  
Voltage Source ◽  
Construction Time ◽  
Voltage Source Inverters ◽  
Three Phase ◽  
And Performance ◽  
Electrical Loads

The first power systems were DG systems designed to meet the needs of local areas.Full load DG applications showed greater benefits in terms of power and performance as well as reducing transmission losses. GDs are very suitable for a specific location and for specific applications because they require a short construction time and require little investment. It is defined on the basis of the size of the plant, which can vary from a few KW to MW (10-50 MW). GD options can be classified as renewable or non-renewable sources from fuel sources. This study deals with a newly-conceived voltage control method for three-phase four-leg voltage source inverters (VSIs) which are being required in autonomous power generating units devoted to supply both three-phase and single-phase electrical loads

scholarly journals Model Predictive Current Control Method with Improved Performances for Three-Phase Voltage Source Inverters

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 625 ◽  
Author(s):  
Eun-Su Jun ◽  
So-young Park ◽  
Sangshin Kwak
Keyword(s):  
Control Method ◽  
Harmonic Distortion ◽  
Sampling Period ◽  
Current Control ◽  
Voltage Source ◽  
Phase Voltage ◽  
Small Current ◽  
Voltage Source Inverters ◽  
Switching Losses ◽  
Three Phase

In this paper, the model predictive current control (MPCC) method using two vectors has been proposed to control output currents of three-phase voltage source inverters (VSIs) with small current errors and current ripples. Also, the proposed method can reduce switching losses by applying the vector pre-selection technique to the MPCC for the VSI. The VSI generates seven voltage vectors to control the output currents, but the proposed method uses four available voltage vectors with one switch, which are classified by the vector pre-selection method clamping one leg and conducting the largest output current among the three legs to reduce the switching losses. In the proposed method, selecting two future voltage vectors among the four voltage vectors and dividing them in a future sampling period are determined by an optimization process. The proposed method results in the lower total loss, better total harmonic distortion (THD), and smaller current errors than the conventional method with half the sampling period of the proposed method due to the optimal process. Simulation and experimental results of the three-phase VSIs are presented in order to verify the effectiveness of the proposed method.

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