TransGrid Solutions Inc.

Winnipeg, Canada

TransGrid Solutions Inc.

Winnipeg, Canada
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Arunprasanth S.,RTDS Technologies Inc. | Annakkage U.D.,University of Manitoba | Karawita C.,TransGrid Solutions Inc. | Kuffel R.,RTDS Technologies Inc.
IET Conference Publications | Year: 2017

This paper investigates the impact of different control modes of VSC HVdc to the transient stability of power systems. VSC HVdc offers fast bi-directional power control in addition to fast ac voltage control. This feature is utilized in this study to enhance the transient stability of a conventional generator in a power system. Simulations are carried-out for three scenarios: (i) the generator is connected to the VSC terminal, (ii) the generator is connected at a distance from the VSC terminal, and (iii) the VSC is connected at a distance from the generator terminal. The critical fault clearing time is used as the indicator of the stability of power system. In each scenario, effects of both ac voltage control and reactive power control are studied. This paper shows that the transient stability of power system can be improved by having a VSC with fast ac voltage control near to synchronous generators.

Suriyaarachchi D.H.R.,TransGrid Solutions Inc. | Karawita C.,TransGrid Solutions Inc. | Mohaddes M.,TransGrid Solutions Inc.
IET Conference Publications | Year: 2017

This paper discusses the applicability of a Full-Bridge MMC and a Half-bridge MMC to tap an LCC-HVDC. The suitability of the two types of converters has been evaluated by considering the performance of the LCC-HVDC system under AC and DC fault conditions. The energization sequences control and protection modifications to the LCCHVDC system, equipment requirements associated with each converter technology has been discussed.

Mohaddes M.,TransGrid Solutions Inc. | Karawita C.,TransGrid Solutions Inc.
IET Conference Publications | Year: 2017

This paper introduces a new method of controlling the arm currents in a VSC called direct current control. This method is a viable alternative to the commonly used decoupled control technique. The main advantages of this method are the simplicity and ease of tuning. It also makes it easy to apply a limit on the arm current orders. Although only the application of the method to a STATCOM controller is shown in this paper, it can be used in other applications such as HVDC transmission.

Denboer N.,TransGrid Solutions Inc. | Karawita C.,TransGrid Solutions Inc. | Mohaddes M.,TransGrid Solutions Inc.
IET Conference Publications | Year: 2017

This paper applies frequency scanning techniques to the calculation of multi-infeed interaction factor (MIIF) at harmonic frequencies as a screening method for harmonic interactions of HVDC systems. The frequency scan technique is compared with the EMT simulations based current injection method, which is commonly used for MIIF calculations, for a set of test cases and is shown to be a faster, convenient and more accurate technique. Instead of voltage ratio based MIIF, the concept of multi-infeed energy interaction factor (MIEIF), which is based on the energy ratio is then proposed as an extension. The MIEIF is calculated in the frequency range of 10-3000Hz and plotted against frequency. The MIEIF curves can then be used as a screening method in the design of the ac filters for an HVDC link or FACTs device. MIEIF is compared with MIIF and gives a good indication of the level of harmonic interactions in cases where MIIF does not.

News Article | December 22, 2016

According to Future Market Insights' report titled "High Voltage Direct Current (HVDC) Transmission System Market: Global Industry Analysis and Opportunity Assessment 2016-2026," the global market for high voltage direct current transmission systems, which is now valued at US$ 6,191.8 Mn, is likely to reach US$ 14.36 Bn in market value by the end of 2026 - attaining expansion at a CAGR of 8.8%. According to the report, North America, Western Europe and Asia Pacific excluding Japan (APEJ) are the leading markets for HVDC transmission systems globally. Key market players include ABB Ltd., TransGrid Solutions Inc., Siemens AG, Prysmian SpA, Toshiba Corporation, General Electric Co., Hitachi Ltd., Abengoa SA, and ATCO Electric Ltd. Key Research Findings from Future Market Insights' Report on the Global HVDC Transmission System Market HVDC transmission is expected to become more efficient due to rampant popularity of advanced valve components such as insulated gate bipolar transistors (IGBT). Several such components that avert transmission failures can be categorised under the solution-based components. By 2026, global revenue share of such components is forecast to be about 60%, while revenues from sales of service-based HVDC transmission components will incur rapid growth at a 10.5% CAGR. According to a comprehensive cost analysis in the research report, high installation costs are a major drawback for adoption of high-voltage direct current over other electric transmission systems. HVDC transmission components are expensive and need to be replaced if damaged. With respect to deployment of HVDC transmission systems, subsea deployment is expected to gain adoption due to its comparatively lower installation cost and a rise in demand for offshore power distribution. By 2026, the 33% market value share attributed by overhead deployment model is likely to marginally surpass subsea deployment's share by 5 percent or less. Preview Analysis on Global High Voltage Direct Current (HVDC) Transmission System Market Segmentation By System Component - Solutions (AC & DC Harmonic Filters, Converters, DC Lines, Circuit Breakers and Others), Services; By Technology - LCC, VSC and Others; By Deployment - Overhead, Underground, Subsea and Combination; By Power Rating - Below 1000 Mws, 1001 To 2000 Mws and 2001 Mws & Above: Manufacturers of HVDC systems incur a competitive edge in the power supply industry as these systems provide efficient transmission with optimal electricity consumption. To extend the environmental impact of HVDC transmission systems, manufacturers are adopting renewable or "clean" energy for transmission and reducing pollution arising from unwanted electromagnetic energy emanating from electrical lines. In the power distribution industrial sector, managing the impact of energy transmission on the environment is now being considered with an utmost regard. A recent update on companies and governments undertaking steadfast measures on clean energy includes the approval of the US Department of Justice for the installation of a 3GW HVDC transmission system for the country's TransWest Express Transmission Project. A power ratings analysis included in the report indicates that power distribution above 2,000 MWs will witness a rise in market value share, accounting for nearly 40% of the global HVDC transmission system market value by the end of 2026. Owing to such power consumption trends, companies such as General Electric Co. and ABB Ltd. among others, have included Ultra high-voltage direct current (HVDC) transmission systems as part of their original offerings. Speak with Analyst for any Report Related Quires: Lack of proficient engineers to effectively operate as well as maintain HVDC transmission systems remains a longstanding challenge. Prominence of line-commutated converter (LCC) and voltage-source converter (VSC) technologies further necessitates the need for highly-qualified engineers. Comparatively, by the end of 2026, VSCs will be the dominant technology in the global market, accounting for nearly US$ 9 Bn in revenues. Future Market Insights (FMI) is a leading market intelligence and consulting firm. We deliver syndicated research reports, custom research reports and consulting services which are personalized in nature. FMI delivers a complete packaged solution, which combines current market intelligence, statistical anecdotes, technology inputs, valuable growth insights and an aerial view of the competitive framework and future market trends.

Arunprasanth S.,University of Manitoba | Annakkage U.D.,University of Manitoba | Karawita C.,TransGrid Solutions Inc. | Kuffel R.,RTDS Technologies Inc.
IEEE Transactions on Power Delivery | Year: 2016

This paper proposes a robust frequency-domain method to tune the d-q decoupled control system used in Modular Multilevel Converter-type Voltage Source Converter (MMC-VSC) systems. A linearized state-space model of the MMC-VSC system is developed and used to calculate the stability-related frequency-domain attributes. The controller design problem is formulated as an optimization problem. In this paper, the simulated annealing optimization technique is applied to find the proportional-integral (PI) controller parameters that give desired damping for the oscillatory modes and desired values for decaying exponential modes. The efficacy of this method is tested on the electromagnetic transient model of a two-terminal MMC-VSC system on the real-time digital simulators, and the results are provided in this paper. Finally, tuned controller parameters for different ac system strengths are discussed and it is shown that this mathematical model is suitable to tune the PI-controller parameters for MMC-VSC systems connected to strong as well as weak ac networks. © 2015 IEEE.

Dissanayaka A.,University of Manitoba | Annakkage U.D.,University of Manitoba | Jayasekara B.,TransGrid Solutions Inc. | Bagen B.,Manitoba Hydro
IEEE Transactions on Power Systems | Year: 2011

This paper presents a linearized technique to determine a risk-based index for dynamic security. The method is an extension to an existing technique in which the risk of steady state security is calculated using the mean and variance of load uncertainty. The proposed method is applied to calculate the risk indices for the IEEE New England 39-bus test system. The results obtained from the proposed method are validated against those estimated by Monte Carlo simulation. Both approaches produce virtually the same results for small load deviations. © 2011 IEEE.

Pham J.-P.,University of Manitoba | Denboer N.,TransGrid Solutions Inc. | Lidula N.W.A.,University of Manitoba | Perera N.,University of Manitoba | Rajapakse A.D.,University of Manitoba
2011 IEEE Electrical Power and Energy Conference, EPEC 2011 | Year: 2011

A pattern classification technique for fast detection of power islands in a distribution network is implemented and tested. It utilizes voltage and current transient signals generated during an islanding event to detect the formation of the island. A Decision Tree classifier is trained to categorize the transient generating events as 'islanding' or 'non-islanding'. It involves two basic stages of signal processing to extract the required feature vectors for the classification. The first stage involves signal filtering and in the second stage signals are processed by rectifying, summing, and low-pass filtering to get the energy content in the three phases during a selected time-frame. Analog filters, rectifiers, adders and micro-controllers complete the implementation. The performance of the design was tested with signals generated using a real-time waveform playback instrument. A simple radial medium voltage distribution system with single distributed generator was simulated in PSCAD/EMTDC to obtain the transient waveforms. The experimental and simulation results give comparable results showing high accuracy in detecting islanding events very fast. © 2011 IEEE.

Karawita C.,Transgrid Solutions Inc. | Annakkage U.D.,University of Manitoba
IET Conference Publications | Year: 2010

A linearized model of an HVDC system is presented in a control block diagram form. The converter models (rectifier and inverter), DC transmission system, phase lock oscillators (PLOs) and the HVDC controllers are included. The control block diagram model of HVDC system simplifies, in understanding and modelling, the complex operation of the HVDC system. The model can be used in small signal stability assessment to analyze subsynchronous frequency HVDC interactions such as generator-turbine torsional interactions. Furthermore, the model can be easily implemented in a software environment such as Simulink for response analysis, control tuning and other educational purposes.

Suriyaarachchi D.H.R.,University of Manitoba | Annakkage U.D.,University of Manitoba | Karawita C.,Trans Grid Solutions Inc. | Jacobson D.A.,Manitoba Hydro
IEEE Transactions on Power Systems | Year: 2013

This paper presents a comprehensive analysis of sub-synchronous interactions in a wind integrated power system to understand and mitigate them. The proposed procedure has two steps. In the first step, a frequency scan is performed to determine the presence of resonant frequencies in the sub-synchronous range. In the second step, a detailed small signal analysis is performed. Participation factors are used to identify the state variables that are involved in the interaction, and the controllability indices are used to determine the mitigation method. It is shown that the sub-synchronous interaction present in Type 3 wind turbine-generators connected to the grid through series compensated lines is an electrical resonance between the generator and the series compensated line which is highly sensitive to the rotor side converter current controller gains. © 1969-2012 IEEE.

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