Predictive Firing Algorithm for Soft Starter Driven Induction Motors

Nannen, Hauke; Zatocil, Heiko; Griepentrog, Gerd

doi:10.1109/tie.2021.3135606

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…Since the frequency of the grid voltage is constant, the operating point of the motor is relatively constant when using soft starters. To drive a motor using soft starters, there are phase control method [10]- [12], predictive control method [13]- [14], and DFC method [15]- [17]. In [10], a method of gradually increasing the applied voltage based on the preset rise time was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the phase control, the predictive control method basically assumes that two of the three phases are conducting, and uses the motor parameters to predict the maximum current, flux, torque, etc. of the motor, and determine whether these predicted values are within an acceptable limit [13]. This method can increase efficiency by minimizing losses because only two phases are used, but it has the disadvantage of requiring the motor parameters to be known in advance.…”

Section: Introductionmentioning

confidence: 99%

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The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

Jang,

Hyon,

Hwang

et al. 2024

IEEE Access

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Soft starters are used in a variety of industries to safely apply grid voltage to drive induction motors. The soft starter protect the motor from overcurrent and torque that occurs during starting of the motors by regulating the voltage applied to the motor. There are various methods to implement this soft starter, and among them, the discrete frequency control (DFC) method allows for simple operation, but research to limit the motor peak current is still insufficient. In this paper, a new method to limit the current and start the induction motor using the DFC was proposed. The proposed method calculates the feedforward component of the firing angle according to the speed command and add it to the output of additional controller to limit the current. The proposed method has the advantage of seamless transition to the phase control method when the speed command increases and can be implemented without structural change from the conventional phase control method. Using this method, it is implemented without motor parameter information, and the system efficiency is improved. The effectiveness of proposed method was verified through simulations and experiments.INDEX TERMS Soft starter, discrete frequency control (DFC), efficiency, induction motor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

Jang,

Hyon,

Hwang

et al. 2024

IEEE Access

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“…The main electricity consumption in industrial enterprises is asynchronous electric motors. Since the starting current of an asynchronous motor (AM) is several times higher than its rated current [1][2][3][4][5][6], significant network voltage sags occur during start-up. Such voltage sags (VSs) affect electricity consumers connected to the network, which may have different levels of impedance to VSs and different qualities of electricity, and may also lead to an emergency situation and de-energizing of the system [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Simulation-Based Analysis of Dynamics of Autonomous Electric Power Systems

Awwad¹,

Al-Soud²,

Al-Quteimat³

et al. 2022

MMEP

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This paper is devoted to the development of a model of an autonomous electric power system to study random processes of voltage, current and power changes in emergency and dynamic operation modes. A diagram for calculating short-circuit currents has been presented, which was focused on a typical wide range of autonomous power plants with three diesel generator units. A model of an autonomous power plant has been developed, allowing to solve the assignments of determining short-circuit currents and starting currents of electric power machines. The equivalent network of the studied power system for transient calculations has been presented. Thus, the voltage waveforms have been obtained. A comparative assessment of theoretical calculation methods and simulation analysis demonstrated a high degree of accuracy of the simulation results. The use of approach suggested in the article and the developed model allows to increase the accuracy of conclusions when testing the abruptly variable processes and to make the most reasonable choice of measures to improve the quality of electricity and the reliability of electrical equipment. In particular, simulation analysis and obtaining transient curves for starting powerful consumers allow more accurately choose the type of circuit breakers used and the related configuration parameters.

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“…The purpose of soft starters is the ability to control processes at all stages of starting an electric motor: not only smoothly accelerate, but also smoothly slow down [19,20]. The payment for a two-fold and three-fold decrease in the starting current in modern common thyristor soft starters for AC motors can be called a significant deterioration in the current shape under load and the appearance of an excess reactive component.…”

Section: Introductionmentioning

confidence: 99%

“…Trends in the development of modern control systems (CS) for power electronics converters dictate the requirements for the complexity of automation processes in soft starters for induction motors. In the field of predictive algorithms, control systems can be implemented both closed-loop using current, rotation, and magnetic flux sensors [22][23][24] and open-loop without using feedback sensors [25].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Control System for a Soft Starter of an Induction Motor Based on a Multi-Zone AC Voltage Converter

Kosykh¹,

Udovichenko²,

Lopatkin³

et al. 2022

Preprint

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The development trends of the modern world of power electronics dictate the requirements for the use of AC voltage converters as soft starters for induction motors. A direct connection of the motors to the mains voltage negatively affects both the motor itself and the mains system as a whole due to high starting currents values, which entail, as a rule, more frequent accidents and shorter the drive system service life. The paper presents a study of the control system of a multi-zone AC voltage regulator. The use of capacitive voltage dividers will also compensate for the consumed reactive power. The article analyzes the features of modern soft starters, describes the circuit design, presents a mathematical calculation by the method of algebraization of differential equations, a performed simulation modeling in Matlab/Simulink, and also an assembled experimental stand for further research. Particular attention is paid to the definition of the multizonality concept of the proposed converter and the analysis of the control method. The developed algorithm of the double-loop automatic control system will minimize the influence of induction motors on the mains voltage, and thus improve electromagnetic compatibility.

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Predictive Firing Algorithm for Soft Starter Driven Induction Motors

Cited by 6 publications

References 16 publications

The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

Simulation-Based Analysis of Dynamics of Autonomous Electric Power Systems

Analysis of the Control System for a Soft Starter of an Induction Motor Based on a Multi-Zone AC Voltage Converter

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