On the Stability of Volts-per-Hertz Control for Induction Motors

Hinkkanen, Marko; Tiitinen, Lauri; Mölsä, Eemeli; Harnefors, Lennart

doi:10.1109/jestpe.2021.3060583

Cited by 10 publications

(28 citation statements)

References 21 publications

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“…For higher frequencies, the full-slip compensation is applied. Adjusting the function reduces the slip compensation for lower frequencies as instabilities may occur in that region [31].…”

Section: Slip Compensationmentioning

confidence: 99%

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

Kyslan

Lacko

Ferková

et al. 2022

International Transactions on Electrical Energy Systems

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Five-phase induction machines (5pIMs) are a viable alternative for a wide range of industrial applications. The penetration of drives with 5pIM into industrial applications is slow because of the complexity of the proposed control algorithms. In standard V / f control of induction machines, the stator current is not controlled directly and options for current limitation are restricted. This paper hence addresses a novel current limitation technique for the V / f control algorithm of 5pIM. In addition, a simple speed sensorless control algorithm based on the slip compensation is introduced. A combination of both algorithms is suitable for low-cost medium-precision drive applications. Experimental results, realized on Texas Instruments F28335 DSP, illustrating the performance of novel current limitation technique and sensorless control, are included.

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“…For higher frequencies, the full-slip compensation is applied. Adjusting the function reduces the slip compensation for lower frequencies as instabilities may occur in that region [31].…”

Section: Slip Compensationmentioning

confidence: 99%

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

Kyslan

Lacko

Ferková

et al. 2022

International Transactions on Electrical Energy Systems

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“…In this subsection, the dynamic equations of the IG in terms of d-q components of stator and rotor voltages can be described as [37,39]:…”

Section: ) Modeling Ofscigmentioning

confidence: 99%

“…The SCIG's Lyapunov EF is derived depending on the energy balance equation which characterizes the energy transfer between the input and output of the SCIG based on the principle of energy conservation [14,18]. Consequently, the energy balance equation can be expressed in terms of SCIG mechanical and magnetic field energies, and , which can be defined as [38,39]. =…”

Section: ) Modeling Ofscigmentioning

confidence: 99%

New Analysis Framework of Lyapunov-Based Stability for Hybrid Wind Farm Equipped With FRT: A Case Study of Egyptian Grid Code

et al. 2021

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Due to the continuous increase of fuel prices and pollutions, the use of renewable energy especially wind has increased. In developing countries including Egypt, squirrel cage induction generator wind turbine (SCIG-WT) represents a considerable proportion of the total capacity of installed wind farm due to its qualities such as low cost and easy availability. However, its operation has a substantial effect on system stability. In contrast, doubly fed induction generator wind turbine (DFIG-WT) is broadly penetrated the electrical grid as it keeps the system stable. In this work, the ability of WT generators to continue operating rather than tripping at the time of faults is analyzed for proper stability investigation. The detailed control and stability of a grid-connected large scale SCIG and DFIG of Zafarana, Suez Gulf area, Egypt are discussed whereas the parameters of fault ride through (FRT) curve of Egypt grid code is utilized. Moreover, a precise analytical stability argument using a proposed integrated nonlinear dynamical model is presented. Conditions for global asymptotic stability of the SCIG in the sense of Lyapunov function (LF) are given and tested by time domain simulation. The eigenvalues of the matrices of LF and its derivative are determined by which the stability boundaries are determined depending on the positivity of these matrices. The dynamic behavior of the whole system is simulated in MATLAB/ Simulink interface programming while the practical data are collected from an experimental model consisting of DFIG-WT to demonstrate the efficacy of the FRT control system.

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“…These oscillations are caused by the interaction of the electrical and the mechanical subsystems (Figure 1), which are nonlinearly coupled through the electromagnetic torque and the back-electromotive force and are affected by changes in motor parameters. Hence, many studies can be found in the literature where the effects of motor and inverter parameters such as stator resistance, leakage inductance, rotor moment of inertia, DC-link capacitor, inverter dead time, switching frequency, and the number of poles are thoroughly analyzed [9]. In [7] a small signal linearized representation is used to carry out a stability analysis of induction motors fed by a pure sinusoidal voltage source of adjustable amplitude and frequency, while inverter dead-time effect and modeling is considered in [10,11] and represented as an equivalent resistance in [12].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Open-Loop V/Hz Controlled Asynchronous Machines and Two Novel Mitigation Strategies for Oscillations Suppression

et al. 2022

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Asynchronous machines are always widely used in most industrial applications due to their reliability, flexibility, and manoeuvrability. To achieve variable speed operations, the quite simple open-loop V/Hz control is largely utilized. Under open-loop V/Hz control, the nonlinear interaction is well known to cause current and torque oscillations while operating at low to medium speeds under light loads. This article presents the stability analysis of induction motors at low–medium frequencies under no-load conditions with the V/Hz control. A system representation in the form of state space is discussed, and the region of instability is plotted against the V/f plane. Two novel and refined methods for the mitigation of oscillations in the region of instability are presented. The two proposed algorithms are finally tested and validated through simulation on an inverter-fed induction motor drive system.

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On the Stability of Volts-per-Hertz Control for Induction Motors

Cited by 10 publications

References 21 publications

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

New Analysis Framework of Lyapunov-Based Stability for Hybrid Wind Farm Equipped With FRT: A Case Study of Egyptian Grid Code

Stability Analysis of Open-Loop V/Hz Controlled Asynchronous Machines and Two Novel Mitigation Strategies for Oscillations Suppression

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On the Stability of Volts-per-Hertz Control for Induction Motors

Cited by 10 publications

References 21 publications

Current Limitation Method for V / f Control of Five-Phase Induction Machines

Current Limitation Method for V / f Control of Five-Phase Induction Machines

New Analysis Framework of Lyapunov-Based Stability for Hybrid Wind Farm Equipped With FRT: A Case Study of Egyptian Grid Code

Stability Analysis of Open-Loop V/Hz Controlled Asynchronous Machines and Two Novel Mitigation Strategies for Oscillations Suppression

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Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines

Current Limitation Method for $V / f$ Control of Five-Phase Induction Machines