The Influence of Induction Motors on Voltage Sag Propagation—Part I: Accounting for the Change in Sag Characteristics

Milanović, Jovica V.; Aung, Myo Thu; Vegunta, Sarat Chandra

doi:10.1109/tpwrd.2007.915846

Cited by 46 publications

(36 citation statements)

References 5 publications

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“…During the disturbances, to continue its operation without negatively affecting the stability of the system, microgrid changes its operation from the grid tied mode to the island mode. The type of microgrid, the micro sources used and the adapted control strategy are the main parameters of stability issues [26]. The micro sources are connected along with power electronic devices.…”

Section: A Transient Stabilitymentioning

confidence: 99%

Transient Analysis of Isolated Micro Grid using Droop Controller during Faults

Vakula¹

2018

IJRASET

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Now a days the scenario is in the direction of renovating centralised power generation to distribution generation. Distribution generation is considered to be a supplementary source of power in addition to the centralized power generation. Micro resource and distributed generation through controllers, loads and storage space devices to create a micro grid(MG). The micro grid senses and switches to isle mode in case of interruption. For this purpose, P-F&Q-V Droop control method is adopted to observe its impact during transient stability period. The proposed work gives the impact of droop control technique and stability of DG based on inverter arrangement of micro grid. In this fast acting current limiter is also employed to reduce the short circuit current there by decreasing the heating effect of the transmission lines.

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Section: A Transient Stabilitymentioning

confidence: 99%

Transient Analysis of Isolated Micro Grid using Droop Controller during Faults

Vakula¹

2018

IJRASET

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“…The IM may undergo a limited amount of retardation and may be able to reaccelerate on voltage recovery, as shown in curve B. Otherwise, the electric torque produced by the IM may become less than that of the load, the IM may decelerate and the continuity of the output may be lost, as shown in curve C [5] .…”

Section: Effects Of Voltage Sags On Imsmentioning

confidence: 99%

Voltage Sag Effects on the Process Continuity of a Refinery with Induction Motors Loads

El-Shennawy¹,

El-Gammal²,

Abou-Ghazala³

2009

American J. of Applied Sciences

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Problem statement: Process continuity of industrial plants (like a refinery) is subjected to several shutdowns due to voltage sags causing large induction motors to trip, either by undervoltage or by overcurrent relays, sometimes by the mechanical protection. These unplanned shutdowns cost the plant tens of thousands of dollars per shutdown in addition to material damage costs, restart charges and any penalties due to delay in product delivery and shipping. Approach: The behavior of induction motors during voltage sags was investigated. In addition to the well-known parameters of voltage sags (time and duration), other parameters such as three-phase unbalance, point on the wave of sag occurrence, harmonics, loading percentage and pre-sag voltage were also examined through computer simulations using the MATLAB/SIMULINK toolbox. Motors' ride-through capability during sags was also studied and guidelines for adjusting the protection relays of the induction motors were highlighted. Results: Results showed that response of induction motor to voltage sags is dependant on sag characteristics, as well as motor and load parameters. Three-phase voltage sags and sags occurring at zero crossing were the most severe events. Transient currents occurring at the instants of voltage sag and voltage recovery are directly proportional to the voltage drop, not to the remaining voltage magnitude. Transient currents and torques induced at the instant of sag recovery are higher than those induced at the instant of sag occurrence. Lightly-loaded motors and motors operated at voltages higher than the nominal voltage are less affected by voltage sags. Conclusion: Manufacturers of induction motors impose strict protection settings to protect their machines from any possible damage. However, the starting process of the motor inherits starting currents and torques much higher than those occurring during voltage sags. Readjusting of the protection relay settings especially the undervoltage relay may be adequate to counteract voltage sags. No conditioning equipment was required.

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“…In order to quantify the impact of the DVR on voltage sags duration and magnitude a study procedure needs to be specified. The duration of the sag is determined as the total time with voltage magnitude below 0.9 p.u [18,19]. The sag magnitude, however, is more complex to be quantified in presence of large penetration of IMs.…”

Section: Test Systems and Study Proceduresmentioning

confidence: 99%

“…The conversion to equivalent rectangular sag [19][20][21][22] can also be performed, but it is not adequate for slow recovery sags. Since the sags have long duration, the magnitude of the equivalentrectangular sag is always very high and too optimistic compared to reality.…”

Section: Test Systems and Study Proceduresmentioning

confidence: 99%

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Mitigation of voltage sags through distributed demand side technology

García-Valle

Silva

et al. 2009

8th International Conference on Advances in Power System Control, Operation and Management (APSCOM 2009)

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The objective of this paper is to demonstrate that voltage sags can be mitigated through the application of demand voltage reserve technology. It means that a demand as voltage reserve with the capability of sensing the voltage magnitude supplied by the network could also be added to the cyclic control of thermal loads in order to disconnect the supplies in case of slow recovery voltage sags. The disconnection of the supplies for few seconds would lead to small impact on their temperature, but could be fundamental to avoid the trip of induction motors or other sensitive loads.

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The Influence of Induction Motors on Voltage Sag Propagation—Part I: Accounting for the Change in Sag Characteristics

Cited by 46 publications

References 5 publications

Transient Analysis of Isolated Micro Grid using Droop Controller during Faults

Transient Analysis of Isolated Micro Grid using Droop Controller during Faults

Voltage Sag Effects on the Process Continuity of a Refinery with Induction Motors Loads

Mitigation of voltage sags through distributed demand side technology

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