Numerical Modeling and Simulation of Unsymmetrical Transients on Synchronous Machines With Neutral Included

Wamkeue, R.; Kamwa, Innocent; Dai-Do, X.

doi:10.1080/07313569808955810

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…In this section investigative studies are conducted on the performance of the split air conditioner under distinct operational conditions, each of which reflecting the type of disturbance typically manifest, under the terms foreseen in current legislation and which regulates the question of energy quality indicators [22,23]. As usual, the studies include, for the same condition for the voltage supply, to obtain information to correlate and validate the results derived from the simulations with their counterparts extracted from laboratory tests.…”

Section: Performance Testsmentioning

confidence: 99%

A Proposal for the Time Domain Modeling of Split Air Conditioners for Consumer Reimbursement Studies

Rezende¹,

Almeida²,

Gondim

et al. 2015

International Journal of Emerging Electric Power Systems

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This paper deals with computer application procedures for the evaluation of the causal consistency between anomalous phenomena manifested in electrical networks, along with the physical damage associated with electrical equipment and possible reimbursement requests. The focus is on the development of an air conditioner appliance model of the type known as split founded upon a representation, in the time domain, in accordance with the Alternative Transients Program (ATP) simulator requirements. This approach permits investigations concerning the performance of the product when submitted to ideal and non-ideal supply conditions. Once the equipment model is implemented in the program, a set of investigative studies are carried out to show the device performance under specific energy quality disturbance conditions. In addition, there are still the results for the validation of the process established through the correlation between computational performance of the air conditioner with corresponding studies carried out experimentally, which are presented herein. Moreover, once the effectiveness of the developed model is verified, it is implemented into the Requests for Reimbursement Software. Investigations related to the correlation between disturbances and the levels of thermal and dielectric tolerance are then performed aiming at illustrating the use of the research results for the reimbursement analyzes purposes.

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Section: Performance Testsmentioning

confidence: 99%

A Proposal for the Time Domain Modeling of Split Air Conditioners for Consumer Reimbursement Studies

Rezende¹,

Almeida²,

Gondim

et al. 2015

International Journal of Emerging Electric Power Systems

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show abstract

“…Consequently, the magnitude of fault current during low rotor speed stage will be smaller than that of the fault current during high rotor speed stage. As for asymmetrical fault, the symmetrical component method can be used [13,14] to calculate fault current. The reactance in an asymmetrical fault may contain zero-and negative-sequence reactance.…”

Section: Influence Of Resistance On Fault Current Levelmentioning

confidence: 99%

Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Duan

2015

IET Renewable Power Generation

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Back-to-back starting is a widely accepted starting method for pumped storage units. A back-to-back starting model of pumped storage units was built using the ElectroMagnetic Transients Program including DC (EMTDC) software package. The short-circuit fault during back-to-back starting was investigated for the first time. The starting process was simulated and compared with real data from a pumped storage power plant in northeast China. The rotor speed and the effect of resistance during fault period were also discussed. The results showed that the fault current has significant magnitude and low-frequency characteristic. Recommendations were provided to realise secure and reliable fault clearance during back-to-back starting based on the fault characteristics and real de-excitation test results of the pumped storage power plant.

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“…1). The total current in a solid conductor is obtained from the applied voltage and induced eddy currents as (2) Skin effects are neglected in conductors that are small in comparison with the skin depth defined by (3) where is the frequency of the source. The external circuit connections allow the operating conditions of the synchronous machine to be simulated with the real power supply connection.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Line-to-line short-circuit-based finite-element performance and parameter predictions of large hydrogenerators

Wamkeue

Kamwa

Chacha

2003

IEEE Trans. On Energy Conversion

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A two-dimensional (2-D), time-stepped finite-element (FE) method is used to model and successfully replicate saturated line-to-line and three-phase short-circuit test responses recorded on a 40-pole 13.75-MVA hydrogenerator at Hydro-Quebec's Rapides-des-Quinze generating station. Three levels of line-to-line and sudden three-phase short-circuit tests (0.13, 0.25, and 0.48 p.u.) are simulated numerically using the FE-based model. While symmetrical faults are only used for parameter determination, the computed line-to-line waveforms are thoroughly compared to real data, with special attention given to field current responses. According to IEEE Std.-115-1995, the -axis dynamic reactances and time-constants are computed from three-phase short-circuit tests while the negative-sequence reactance is derived from the line-to-line short-circuit test resulting in a rated armature current. The obtained simulated tests responses and parameter values, from both symmetrical and asymmetrical faults, support the effectiveness of the proposed FE-based model in incorporating the saturation phenomenon, large number of poles, and detailed damper representation to achieve an accurate dynamic performance assessment together with negative-sequence reactance and dynamic constants prediction. Index Terms-Performance and parameter predictions, synchronous machines, transient electromagnetic analysis.

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Numerical Modeling and Simulation of Unsymmetrical Transients on Synchronous Machines With Neutral Included

Cited by 8 publications

References 3 publications

A Proposal for the Time Domain Modeling of Split Air Conditioners for Consumer Reimbursement Studies

A Proposal for the Time Domain Modeling of Split Air Conditioners for Consumer Reimbursement Studies

Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Line-to-line short-circuit-based finite-element performance and parameter predictions of large hydrogenerators

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