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3 results on '"positive negative sequence control"'

1. Assessment of control strategies for fault ride through of SCIG-based wind energy conversion systems

Author

Manaullah and Arvind Kumar Sharma

Subjects
Balanced positive sequence control, positive negative sequence control, dual current control, fault ride through, squirrel cage induction generator, Production of electric energy or power. Powerplants. Central stations, TK1001-1841, Renewable energy sources, TJ807-830, Energy industries. Energy policy. Fuel trade, HD9502-9502.5
Abstract

With increasing penetration of wind energy into the power grid, researchers have started focusing more on control and coordination of wind energy conversion systems (WECS) with the other components at system level, especially during fault. It is important to implement a suitable fault ride through control strategy to avoid tripping of the generators when the power system is subjected to voltage dips normally below 90% of nominal voltage. The dips below 90% may lead to a significant loss of generation and frequency collapse, followed by a blackout. This article implements and assesses the methodologies to deal with such situations for squirrel cage induction generator-based wind energy conversion systems employing fully rated power electronic converters. Three distinct control techniques—namely, balanced positive sequence control, positive negative sequence control, and dual current control—have been simulated and applied to grid side converter of SCIG-based WECS. The performance of all the three control strategies has been compared and presented in this work. During this study, the system is subjected to the most common unsymmetrical line to ground (LG) fault and most severe symmetrical LLL fault on grid for the purpose of anaysis.

Published
2016
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2. Assessment of control strategies for fault ride through of SCIG-based wind energy conversion systems

Author

Arvind Kumar Sharma and Manaullah

Subjects
Engineering, 020209 energy, Blackout, positive negative sequence control, lcsh:TJ807-830, lcsh:Renewable energy sources, 02 engineering and technology, Fault (power engineering), lcsh:HD9502-9502.5, Electric power system, Control theory, lcsh:TK1001-1841, 0202 electrical engineering, electronic engineering, information engineering, medicine, Wind power, business.industry, 020208 electrical & electronic engineering, dual current control, Converters, Grid, lcsh:Energy industries. Energy policy. Fuel trade, lcsh:Production of electric energy or power. Powerplants. Central stations, Balanced positive sequence control, Power rating, fault ride through, squirrel cage induction generator, medicine.symptom, business, Voltage
Abstract

With increasing penetration of wind energy into the power grid, researchers have started focusing more on control and coordination of wind energy conversion systems (WECS) with the other components at system level, especially during fault. It is important to implement a suitable fault ride through control strategy to avoid tripping of the generators when the power system is subjected to voltage dips normally below 90% of nominal voltage. The dips below 90% may lead to a significant loss of generation and frequency collapse, followed by a blackout. This article implements and assesses the methodologies to deal with such situations for squirrel cage induction generator-based wind energy conversion systems employing fully rated power electronic converters. Three distinct control techniques—namely, balanced positive sequence control, positive negative sequence control, and dual current control—have been simulated and applied to grid side converter of SCIG-based WECS. The performance of all the three control strategies has been compared and presented in this work. During this study, the system is subjected to the most common unsymmetrical line to ground (LG) fault and most severe symmetrical LLL fault on grid for the purpose of anaysis.

Published
2016

3. A Comparative Analytical Study on Low-Voltage Ride-Through Reference-Current-Generation (LVRT-RCG) Strategies in Converter-Interfaced DER Units

Author

Mohammadalizadeh Shabestary, Masoud

Subjects
Voltage Dip, Voltage Sequences, Positive Negative Sequences, Maximum Reactive Power Injection, Asymmetrical Grid Faults, Unbalanced Current Injection, Distributed Energy Resource, Power Oscillations, Fault Ride Through, Voltage Support, Unbalanced Voltage, Ancillary Services, Grid Fault, Flexible Voltage Support, Fault Current Limitation, Positive Negative Sequence Control, Power Converters, Reactive Current Injection, Distributed Generation, Instantaneous Power Theory, Flexible Power Control, Voltage Sag, Instantaneous Power Control, Reference Current Generation, Flexible Positive Negative Sequence Control, Symmetrical Components, Low Voltage Ride Through, Smooth Power Injection, Negative Sequence Current, Grid Converter
Abstract

Abstract: Recently, riding through grid faults and supporting the grid voltage under faults have become major requirements in distributed energy resource (DER) units. There have been also extensive efforts in academia and industry to develop and implement control strategies to ride through voltage disturbances, and even to support the grid under such faulted conditions which can be named as low-voltage ride-through (LVRT) technology. Therefore, a comprehensive and comparative study seems to be very useful in order to analyze and discuss available LVRT reference-current-generation (LVRT-RCG) strategies in converter-interfaced DER units, compare their performances, and introduce their pros and cons. This thesis studies all existing (nine) LVRT-RCG strategies available in the literature. These strategies are categorized into two main groups. The analytical evaluations and mathematical assessments of all LVRT-RCG strategies are performed. For a comprehensive evaluation of these strategies, the following important parameters are used in this study: instantaneous active/reactive powers oscillation and maximum phase currents. Analytical expressions of these parameters are formulated, evaluated and used to conduct several evaluation and comparative studies on different strategies. Based on the obtained formulas for the maximum phase currents, the maximum allowable reactive power delivery (MARPD) equations are proposed specifically for each of the nine LVRT-RCG strategies. Proposed equations help each LVRT-RCG technique to provide their best voltage support under the specific maximum phase current restrictions imposed by DER owners. Using different test cases, the strategies are compared and the proposed equations are validated. This thesis can be helpful to evaluate the performance of existing LVRT-RCG strategies, solve their existing drawbacks, exploit the best performance out of each, combine their individual capabilities, and improve them.

Published
2015

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