Assessing and Limiting Impact of Transformer Inrush Current on Power Quality

Nagpal, M.; Martinich, T. G.; Moshref, A.; Morison, K.; Kundur, P.

doi:10.1109/tpwrd.2005.858782

Cited by 60 publications

(42 citation statements)

References 2 publications

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“…Inrush currents are always unbalanced among a three phases power system and create a drop in the line voltages of the power system, thereby degrading the power quality of the overall network. The declining quality levels depend mainly on the decay time constant and the magnitude of the transient inrush current [30][31][32]. Inrush current phenomena have hitherto not been studied in large scale commercial retail refrigeration systems as a consequence of FFR DSR control mechanisms.…”

Section: The Extent Of the Challengementioning

confidence: 99%

“…References [30][31][32]34,35] reported that inrush currents are always unbalanced in a three phase power system and can cause a fall in the line voltages and thereby impacting the power quality of the entire network. Declining quality depends mainly on the decay time constant and the magnitude of the transient inrush current.…”

Section: Impact Of Dsr On Power Consumptionmentioning

confidence: 99%

“…Since the peak inrush current after a DSR event is around 30% higher than those before responding to it, the latter, in particular, might impart voltage fluctuations on the power supply and potentially cause instability to the local power supply system, depending on the stiffness of the supply. References [30][31][32]34,35] reported that inrush currents are always unbalanced in a three phase power system and can cause a fall in the line voltages and thereby impacting the power quality of the entire network. Declining quality depends mainly on the decay time constant and the magnitude of the transient inrush current.…”

Section: Impact Of Dsr On Power Consumptionmentioning

confidence: 99%

“…However, of note [30][31][32]34,35] reported that inrush can cause voltage fluctuations on the power supply and potentially cause instability to the local power supply system. References [35][36][37] reported that inrush current of the induction motor can cause a voltage drop at the distribution line and affect the operation of the other electrical equipment, particularly voltage sensitive devices such as fluorescence lamps and UPS and on occasion can also damage the induction motor start coil.…”

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Impact of Demand Side Response on a Commercial Retail Refrigeration System

et al. 2018

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The UK National Grid has placed increased emphasis on the development of Demand Side Response (DSR) tariff mechanisms to manage load at peak times. Refrigeration systems, along with HVAC, are estimated to consume 14% of the UK’s electricity and could have a significant role for DSR application. However, characterized by relatively low individual electrical loads and massive asset numbers, multiple low power refrigerators need aggregation for inclusion in these tariffs. In this paper, the impact of the Demand Side Response (DSR) control mechanisms on food retailing refrigeration systems is investigated. The experiments are conducted in a test-rig built to resemble a typical small supermarket store. The paper demonstrates how the temperature and pressure profiles of the system, the active power and the drawn current of the compressors are affected following a rapid shut down and subsequent return to normal operation as a response to a DSR event. Moreover, risks and challenges associated with primary and secondary Firm Frequency Response (FFR) mechanisms, where the load is rapidly shed at high speed in response to changes in grid frequency, is considered. For instance, measurements are included that show a significant increase in peak inrush currents of approx. 30% when the system returns to normal operation at the end of a DSR event. Consideration of how high inrush currents after a DSR event can produce voltage fluctuations of the supply and we assess risks to the local power supply system.

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Section: The Extent Of the Challengementioning

confidence: 99%

Section: Impact Of Dsr On Power Consumptionmentioning

confidence: 99%

Section: Impact Of Dsr On Power Consumptionmentioning

confidence: 99%

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Impact of Demand Side Response on a Commercial Retail Refrigeration System

et al. 2018

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“…According to IEEE 1159-1995 standard, voltage sag or temporary loss of voltage is defined as a reduction of root mean square (RMS) voltage to a value between 0.1 and 0.9 per unit at the power frequency for the duration of a half-cycle to 1 minute, where the interruption is a short time deviation and the total voltage loss (<0.1 per unit) in one or some conductors of phase for the duration of a half-cycle to 3 s [5,6]. The main causes of voltage sag include short circuit fault, starting large induction motors, sudden load variations, and energization of the transformer [7,8]. Voltage sag is a temporary event and its causes are also considered as a temporary low or medium frequency phenomenon [9,10].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a DSTATCOM Based on Sliding Mode Control Strategy for Improvement of Voltage Sag in Distribution Systems

Shahgholian

Azimi

2016

Electronics

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Abstract:Voltage sag is considered to be the most serious problem of power quality. It is caused by faults in the power system or by the starting of large induction motors. Voltage sag causes about 80% of the power quality problems in power systems. One of the main reasons for voltage sag is short circuit fault, which can be compensated for by a distribution static compensator (DSTATCOM) as an efficient and economical flexible AC transmission system (FACTS) device. In this paper, compensation of this voltage sag using DSTATCOM is reviewed, in which a sliding mode control (SMC) technique is employed. The results of this control system are compared with a P+Resonant control system. It will be shown that this control system is able to compensate the voltage sag over a broader range compared to other common control systems. Simulation results are obtained using PSCAD/EMTDC software and compared to that of a similar method.

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Simulation of effect of voltage sag on inrush current using MATLAB‐SIMULINK for educational purpose

Vahidi

Khorsandi

2012

Comp Applic In Engineering

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ABSTRACT:Transformer inrush currents are high-magnitude, harmonic-rich currents generated when transformer cores are driven into saturation during energization. These currents have undesirable effects, including potential damage to the transformer, reduced power quality on the system, and relay malfunction. In the present article the effect of voltage sag on inrush current are investigated. Due to aim of this article which is educational purpose the well-known software MATLAB-SIMULINK is used to simulate the effect of voltage sag on inrush current.

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Assessing and Limiting Impact of Transformer Inrush Current on Power Quality

Cited by 60 publications

References 2 publications

Impact of Demand Side Response on a Commercial Retail Refrigeration System

Impact of Demand Side Response on a Commercial Retail Refrigeration System

Analysis and Design of a DSTATCOM Based on Sliding Mode Control Strategy for Improvement of Voltage Sag in Distribution Systems

Simulation of effect of voltage sag on inrush current using MATLAB‐SIMULINK for educational purpose

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