PwrSolutions Inc

Dallas, TX, United States

PwrSolutions Inc

Dallas, TX, United States
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Sahni M.,PwrSolutions Inc | Badrzadeh B.,Vestas Inc. | Muthumuni D.,Manitoba HVDC Research Center Inc. | Cheng Y.,PwrSolutions Inc | And 3 more authors.
IEEE Power and Energy Society General Meeting | Year: 2012

This is the second part of a two-paper series. The first paper presented the tools and techniques for investigation of sub-synchronous control and torsional interaction in Wind Power Plants (WPPs). This paper presents a comprehensive Electro-Magnetic Transient (EMT) simulation based case study to investigate potential Sub-Synchronous Control Interaction (SSCI) issues. The Electric Reliability Council of Texas (ERCOT) transmission grid model is utilized for the case study. Implementation of the system and turbine side scans on the ERCOT grid model has been performed to identify conditions requiring further investigation. Detailed EMT simulations using specific turbine manufacturer models have been performed as part of further investigations. Scenarios around key aspects of the system and turbine model performance have been developed and investigated. © 2012 IEEE.


Badrzadeh B.,Vestas Inc. | Sahni M.,PwrSolutions Inc | Muthumuni D.,Manitoba HVDC Research Center Inc. | Zhou Y.,Vestas Inc. | Gole A.,University of Manitoba
IEEE Power and Energy Society General Meeting | Year: 2012

This is the first part of a two-paper series which investigates different modeling and simulation tools and techniques appropriate for the analysis of sub-synchronous control and torsional interaction in wind power plants. A critical review of the commonly used techniques is presented which allows identifying the three suitable candidates. These methods include frequency scanning method, the test signal method for the calculation of electrical damping provided by the wind turbine generator, and electromagnetic transient analysis which confirms the veracity of the first two methods. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine non-linearities and its active behavior. It is shown that these three tools allow capturing all the information pertinent to sub-synchronous interaction phenomena. The application of these tools and techniques on a practical power system comprising type 3 wind turbines and series compensated lines is demonstrated. Results obtained from these three methodologies are consistent and complimentary. © 2012 IEEE.


Cheng Y.,PwrSolutions Inc | Sahni M.,PwrSolutions Inc
Green Energy and Technology | Year: 2012

With larger wind generation penetration and concentration on the grid, the planning/operation requirements associated with the wind generation have evolved drastically over the last decade or so. While the old challenges such as wind resource forecasting are still under study and of significance, the new trend/attitude of treating the wind generation as the conventional generation from the perspective of the fair market principle of the ISO (Independent System Operator) brings many new challenges associated with wind generation integration. Thus the Voltage Ride-though (VRT) capability, reactive power support, frequency control and sub-synchronous oscillation become key topics from a power system planning standpoint. This chapter briefly introduces all these new study aspects including relevant discussions on WGR model Equivalencing, requirement and assessment of VRT and reactive power, inertial and frequency control of the wind generation, all from power system planning perspective. © Springer-Verlag Berlin Heidelberg 2012.


Sahni M.,PwrSolutions Inc. | Jones R.,SunGard | Cheng Y.,PwrSolutions Inc.
IEEE Power and Energy Magazine | Year: 2012

Signs are emerging that north american power markets are moving toward commonality and maturity in their function, if not their operations. More than ten years after the Federal Energy Regulatory Commission (FERC) announced its Notice of Proposed Rulemaking (NOPR) on standard market design (SMD), major U.S. power markets now seem to have a basis on which to voluntarily provide similar pricing granularity and hedging capabilities to their participants. © 2012 IEEE.


Badrzadeh B.,Australian Energy Market Operator | Sahni M.,PwrSolutions Inc. | Zhou Y.,Vestas Inc. | Muthumuni D.,Manitoba HVDC Research Center Inc. | Gole A.,University of Manitoba
IEEE Transactions on Power Systems | Year: 2013

This paper presents a general methodology for analysis of sub-synchronous interaction in wind power plants. These include appropriate frequency scanning method for the assessment of the sub-synchronous control interaction, and calculation of the electrical damping provided by the wind turbine generator for investigation of the sub-synchronous torsional interaction. A general formulation of both methods applicable to any given wind turbine and network is presented. A dynamic frequency scanning method for the turbine side is developed which takes account of the turbine nonlinearities and its active behavior. Various aspects that need to be considered when injecting a voltage or current signal into the system for dynamic frequency scanning are discussed in detail. The veracity of thesemethods is confirmed against electromagnetic transient analyses. The application of these tools and techniques is demonstrated on a practical power system comprising type 3 wind turbines and series compensated lines. © 2012 IEEE.


Sahni M.,PwrSolutions Inc | Muthumuni D.,Manitoba HVDC Research Center Inc. | Badrzadeh B.,Vestas Inc. | Gole A.,University of Manitoba | And 2 more authors.
Proceedings of the IEEE Power Engineering Society Transmission and Distribution Conference | Year: 2012

This paper aims to outline comprehensive screening guidelines associated with the Sub Synchronous Control Interaction (SSCI) and Sub Synchronous Torsional Interaction (SSTI) for wind power plants. Specific guidelines and methodologies to identify the critical system conditions to be assessed for screening analysis are presented. The application of these techniques on a portion ERCOT grid model with series compensated lines has been demonstrated. Current injection based frequency scans on the system and turbine side are utilized. Based on these scans a guideline to identify the specific candidates for further investigation using Electro Magnetic Transient (EMT)-type simulation is proposed. The results of the screening study are further corroborated by the EMT based simulation case studies. An electrical damping analysis based screening technique for the analysis of SSTI has been presented. The SSTI screening studies have been further corroborated by means of EMT simulations. © 2012 IEEE.


Zavadil R.,Enernex Corporation | Miller N.,General Electric | Ellis A.,Sandia National Laboratories | Muljadi E.,National Renewable Energy Laboratory | And 6 more authors.
IEEE Power and Energy Magazine | Year: 2011

Not much more than a decade ago, the desired action for a wind generation facility was to shut down or disconnect electrically in the event of a disruption on the bulk electric system. This, of course, was a reflection of the novelty that was wind generation at the time, as well as prudent engineering judgment, as the loss of a small amount of generationthe wind plants that were in service at the timeposed little risk to system reliability. © 2011 IEEE.

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