Dynamic sag correctors: cost-effective industrial power line conditioning

Brumsickle, W.E.; Schneider, R.S.; Luckjiff, G.; Divan, Deepak; McGranaghan, Mark

doi:10.1109/28.903150

Cited by 211 publications

(56 citation statements)

References 2 publications

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“…so, the dc-link voltage should always be lower than the peak value of the supply voltage, and it means that the DySC can only compensate for voltage sags no deeper than 50% since the largest injection voltage of the DySC is solely determined by its dc-link voltage. As mentioned in [10], the ride-through time of the DySC in deeper voltage sags is limited by the dc-link energy storage, and it is inadequate to provide reliable protection for sensitive loads. So, although the DySC is an excellent solution for sags in many cases, it is invalid for long-duration deep sags as its compensation ability is limited by the passive rectifier.…”

Section: Basic Concepts Of Dyscmentioning

confidence: 99%

“…The transformerless implementation of the DySC constitutes the rating of 1.5 KVA single phase to 500 KVA three phase in a transformerless implementation and above 500 KVA upto 2000 KVA in series transformer is injected with the device. The unique features [11] of the DySC that are: i) It is transformerless ii) Features single stage power conversion iii) minimizes stored energy iv) Optimally matches protection time to system characteristics [10]. Fig.…”

Section: Basic Concepts Of Dyscmentioning

confidence: 99%

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Analysis of Parasitic Boost Active Voltage Quality Regulator Without Transformer for Power Quality Improvement

2016

IJAERD

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I. INTRODUCTIONPower Quality Problem is the major issue in Industrial and Commercial Section as they can affect large the distribution number of sensitive end users. Studies indicate that Voltage sags, Transients and Momentary interruptions constitute 92% of all the Power Quality problems occurring in power systems [1]. Among the power quality problems, the supply voltage problems are considered most critical and significant, especially voltage quality problems of the point of common coupling. The rapid increase of voltage sensitive load equipment has made industrial processes much more criticism to degradation in the quality of the power supply [2].the voltage generated by power stations has sinusoidal waveform with a constant frequency. Any disturbances to voltage waveform can result in problems related with the operation of electrical and electronic devices. Users need constant sine wave shape, constant frequency and symmetrical voltage with a constant rms value to continue the production. This increasing interest to improve overall efficiency and remove variations in the industry have resulted more complex instruments that are sensitive to voltage disturbances [3]. In fact, voltage sags have always been a huge threat to the industry, and even 0.25 s voltage sag is long enough to interrupt a manufacturing process resulting enormous financial losses[4], [5]. Voltage sags are generally classified according to its depth and duration of time. Sag can be drop between 10% and 90% of the rated RMS voltage. It has the duration time of 0.5 cycles to 1 min [6]. According to the data presented in [7], majority of the sags with long duration time obviously cannot be ignored as they are more intolerable than shallow and short duration sags to the sensitive electrical consumers. II. VOLTAGE SAGSVoltage sags which can cause equipment impacts are caused by faults on the power system.Motor starting also results in voltage sags but the magnitudes are usually not severe enough to cause equipment miss operation.A single line to ground fault condition results in a much less severe voltage sag than 3-phase fault Condition due to a delta--star transformer connection at the plant. Transmission related voltage sags are normally much more consistent than those related to distribution [12]. Because of large amounts of energy associated with transmission faults, they are cleared as soon as possible. This normally corresponds to 3-6 cycles, which is the total time for fault detection and breaker operation Normally customers do not experience an interruption for transmission fault. Transmission systems are looped or networked, as distinct from radial distribution systems. Most of the voltages were 10-30% below nominal voltage, and no momentary interrupts were measured at the plant during the monitoring period (about a year). A. Voltage-Sag Analysis-MethodologyThe methodology is outlined in chapter 9 (proposed) of IEEE Gold book (IEEE standard 493, Recommended practice for the design of reliable industrial and commercial power system) The ...

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Section: Basic Concepts Of Dyscmentioning

confidence: 99%

Section: Basic Concepts Of Dyscmentioning

confidence: 99%

Analysis of Parasitic Boost Active Voltage Quality Regulator Without Transformer for Power Quality Improvement

2016

IJAERD

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“…Several voltage-compensating techniques have been published: Some are based on ASD with energy storage devices [3], [4], [5]. Other references use voltage sag compensators based on ac-ac converter along with autotransformer [6].…”

Section: Introductionmentioning

confidence: 99%

ATP prediction of voltage sag effect on sensitive loads

Cardona¹,

Barros²

2006

REPQJ

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“…The experimental results show that the proposed topology and control strategy can enhance the efficiency remarkably when compared with the conventional ones. [12]. The basic topology of this DySC is shown in Fig.…”

mentioning

confidence: 99%

“…Based on the schemes proposed in [12], [13], a novel transformerless AVQR topology and its adaptive dc-link voltage control strategy are proposed in this paper. Compared with conventional AVQRs, the proposed topology is improved only by replacing the diode rectifier with a thyristor rectifier.…”

mentioning

confidence: 99%

Novel Active Voltage Quality Regulator with Adaptive DC-Link Voltage Control

Xiao

Zeng²,

Li³

et al. 2011

Journal of Power Electronics

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In this paper, a novel Active Voltage Quality Regulator (AVQR) topology with a thyristor rectifier and an adaptive dclink voltage control strategy are proposed. The proposed AVQR can efficiently mitigate the long duration variations (e.g. undervoltages/overvoltages), voltage imbalances and voltage harmonics. Compared with conventional AVQRs, it can regulate the load voltage very well with a much lower dc-link voltage. This is accomplished by replacing the diode rectifier with a thyristor rectifier. Moreover, its dc-link voltage can vary with the deviations of the supply voltage through the proposed adaptive dc-link voltage control strategy. All of these contribute to its significantly higher efficiency for online operating, which is very important and attractive for many applications. The proposed topology and control strategy are theoretically analyzed in detail. Simulation results are also provided in the paper. Finally, the feasibility and effectiveness of the proposed method are verified by means of experimental results from a 2kVA prototype. Both of the simulation and experimental results show that the proposed AVQR can achieve a much higher efficiency and similar regulation performance when compared with the conventional ones.

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Dynamic sag correctors: cost-effective industrial power line conditioning

Cited by 211 publications

References 2 publications

Analysis of Parasitic Boost Active Voltage Quality Regulator Without Transformer for Power Quality Improvement

Analysis of Parasitic Boost Active Voltage Quality Regulator Without Transformer for Power Quality Improvement

ATP prediction of voltage sag effect on sensitive loads

Novel Active Voltage Quality Regulator with Adaptive DC-Link Voltage Control

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