Slip Power Recovery in an Induction Motor by the Use of a Thyristor Inverter

Shepherd, W.; Stanway, J.

doi:10.1109/tiga.1969.4180991

Cited by 43 publications

(5 citation statements)

References 3 publications

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“…The Scherbius drive was developed to return energy from the rotor windings to the main AC supply and improve the efficiency of speed controlled WRIMs. The earliest systems used diode rectifiers on the rotor windings and thyristor based Line Commutated Inverters (LCIs) [31]. These systems represented a great improvement in efficiency over resistor-based speed control systems, but could only operate with motors rotating below synchronous speed and included relatively primitive control systems, as the only available control measure was to adjust the firing angle of the LCI.…”

Section: Historical Backgroundmentioning

confidence: 99%

“…The thyristor based inverters employed in early applications [31,32,33] only permit simple control of the generator by varying the device firing angles. Following the development of improved Bipolar Junction Transistors (BJTs) and Insulated Gate Bipolar Transistors (IGBTs), the currentsourced inverters were replaced with back-to-back voltage sourced converters with a DC link capacitor in the majority of applications [35,36,37,38].…”

Section: Vector Control Of Dfigsmentioning

confidence: 99%

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Bit-Stream control of Doubly-Fed Induction Generators

Bradshaw

Madawala

Patel

2010

2010 IEEE International Conference on Sustainable Energy Technologies (ICSET)

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In recent years rising energy costs and concerns about global climate change have led to the widespread development of renewable electricity generation technology, especially wind generation. The Doubly Fed Induction Generator (DFIG) is commonly used for wind generation applications as it allows for efficient operation of the wind turbine by varying the speed of the generator without resorting to the use of large power converters. A typical DFIG system employs a wound rotor induction generator, with a stator that is directly connected to an external AC grid. The rotor winding is connected to the AC grid via a pair of back-to-back power converters: the Rotor Side Converter (RSC) and Grid Side Converter (GSC).The RSC and GSC require separate vector control systems. Traditionally, these control systems are implemented using microcontrollers, which perform the required control functions sequentially. As the complexity of control algorithms increases to achieve improved functionality and the time available to complete the calculations reduces to keep pace with ever-faster power electronic devices, microprocessor based solutions cannot execute the control program within the available time limit.A potential solution to this performance limitation is the use of hardware based control systems, which can execute control algorithms extremely quickly because many operations are processed in parallel. This is attractive for use in control systems, but implementing hardware control systems is difficult. The designer must either manually translate the control algorithm into individual operations, which are then usually encoded using a Hardware Description Language (HDL), or employ an automated code generation tool. The code is then synthesised and used to program a Field Programmable Gate Array (FPGA).An alternative method for implementing digital control systems is the Bit-Stream control technique. In contrast to the usual methods of implementing digital controllers, Bit-Stream control systems are developed using standard schematic editors provided by FPGA manufacturers. Provided that the desired control functions are available in the Bit-Stream library, the designer need not use HDL to develop the control system.A Bit-Stream based control system for a 2.6 kW DFIG is proposed in this thesis. As previously published research on Bit-Stream control systems focused on scalar control systems only, new Bit-Stream blocks are developed for use in vector control systems. The new vector control blocks include: coordinate transformation units, a Phase Locked Loop (PLL) and a family of modulators which convert Bit-Stream reference signals to gate drive commands for three-phase inverters. A Bit-Stream control system for a 2 kW GSC is developed, simulated and tested experimentally. Elements of this control system are adapted and re-used to develop a Bit-Stream based control system for the RSC of a 2.6 kW DFIG system. These are the first Bit-Stream based vector control systems to be reported in the literature. Supervisory control systems are...

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Section: Historical Backgroundmentioning

confidence: 99%

Section: Vector Control Of Dfigsmentioning

confidence: 99%

Bit-Stream control of Doubly-Fed Induction Generators

Bradshaw

Madawala

Patel

2010

2010 IEEE International Conference on Sustainable Energy Technologies (ICSET)

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“…The open-loop control of single and three-phase induction motors was efficiently developed. However, the response time in closed-loop control of induction motor is very high, and it can be improved by Proportional-Integral-Derivative (PID) controller [9,10].…”

Section: Introductionmentioning

confidence: 99%

FPGA‐based control strategy of five‐phase induction motor drives

Kulandaivel¹,

Sundaram²,

Padmanaban

et al. 2022

The Journal of Engineering

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Here, a novel control technique for Five‐Phase Induction Motor (FPIM) drives using a field‐programmable gate array (FPGA) controller is proposed. Open‐loop control is analysed in terms of the performance and measurement of various power quality factors, such as voltage harmonics, current harmonics, total harmonic distortion, crest factor, unbalanced, short and long‐term flickering, K‐factor, real power, reactive power, apparent power, and power factor. This study experimentally demonstrated a closed‐loop system with both PID and DTC controls for the FPIM. Diminished torque pulsation is obtained by efficiently utilizing the voltage vectors from the total states of 25 = 32. A novel EG voltage vector sequence was proposed for DTC techniques and compared with small, medium, and large voltage vector sequences. Proposed innovative control programming techniques in spartan‐6 XC6SLX25 series FPGA for switching the five‐phase two‐level inverter to reduce the total harmonics distortion by less than 2%.

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“…The slip ring induction motor is being used in industrial applications, such as, crane, hoist, pump, and fan [1]. The frequently used control technique is the static Kramer/Scherbius system in which a diode bridge rectifier connected with the rotor of the slip ring induction motor returns slip energy through a line commutated inverter to the ac supply mains [2]. This configuration was first proposed by A. Lavi and R. J. Polge [3].…”

Section: Introductionmentioning

confidence: 99%

Microprocessor Based Firing Circuit for Static Slip Energy Recovery Controlled Slip Ring Induction Motor Drive

Singh¹,

Naik²

2018

IJET

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Microprocessor based firing control scheme of static slip energy recovery (SER) controlled slip ring induction motor drive is described. In the scheme the microprocessor generates firing pulses and also decides the pair of thyristors of the controlled converter to be gated. It uses less number of hardware components. The oscillograms at different points of the firing circuit and at the output of the controlled converter are presented. These oscillograms resemble with the theoretical wave forms.

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Slip Power Recovery in an Induction Motor by the Use of a Thyristor Inverter

Cited by 43 publications

References 3 publications

Bit-Stream control of Doubly-Fed Induction Generators

Bit-Stream control of Doubly-Fed Induction Generators

FPGA‐based control strategy of five‐phase induction motor drives

Microprocessor Based Firing Circuit for Static Slip Energy Recovery Controlled Slip Ring Induction Motor Drive

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