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Moustafa M.M.Z.,Alexandria University | Nzimako O.,RTDS Technologies Inc. | Dekhordi A.,RTDS Technologies Inc.
Proceedings of the International Conference on Microelectronics, ICM | Year: 2017

This paper presents the modeling and control of a doubly-fed induction generator (DFIG) driven by a wind turbine on a real time digital simulator. Real time digital simulators are widely used in the electric power industry by utilities, equipment manufacturers and research organizations. In this paper, a real time simulation of a fully detailed model of the wind turbine and the associated power electronics including the back-to-back Voltage Source Converter (VSC) controlling the DFIG is presented. The hardware and software tools used for the real time simulation are developed by RTDS Technologies Inc. © 2016 IEEE.

Byeon G.,Korea University | Park I.K.,RTDS Technologies Inc. | Jang G.,Korea University
Journal of Electrical Engineering and Technology | Year: 2010

This paper presents a study of a DFIG wind power generation system for real-time simulations. For real-time simulations, the Real-Time Digital Simulator (RTDS) and its user friendly interface simulation software RSCAD are used. A 2.2MW grid-connected variable speed DFIG wind power generation system is modeled and analyzed in this study. The stator-flux oriented vector control scheme is applied to the stator/rotor side converter control, and the back-to-back PWM converters are implemented for the decoupled control. The real-wind speed signal extracted by an anemometer is used for a realistic, reliable and accurate simulation analysis. Block diagrams, a mathematical presentation of the DFIG and a control scheme of the stator/rotor-side are introduced. Real-time simulation cases are carried out and analyzed for the validity of this work.

Liang Y.,University of Manitoba | Lin X.,University of Manitoba | Gole A.M.,University of Manitoba | Yu M.,RTDS Technologies Inc.
IEEE Transactions on Power Systems | Year: 2011

This paper introduces an approach which enables very large power systems to be modeled on real-time electro-magnetic transients (EMT) digital simulators. This is achieved using an improved wide-band multi-port equivalent, which reduces a large power network into a small manageable equivalent model that preserves wide-band behaviors. The low-frequency or electromechanical transients are captured with a transient stability analysis (TSA) type electromechanical equivalent derived using coherency-based reduction techniques. The high-frequency behavior is accurately captured by placing in parallel with the TSA equivalent, a passive frequency dependant network equivalent (FDNE). The validity of the proposed technique is demonstrated by comparing the approach with detailed electromagnetic simulations of a modified version of the New England 39-bus test system that includes an HVDC infeed. The power of the method is demonstrated by the real-time electromagnetic transient simulation of a large 2300-bus 139-generator system. © 2011 IEEE.

Dehkordi A.B.,University of Manitoba | Neti P.,General Electric | Gole A.M.,University of Manitoba | Maguire T.L.,RTDS Technologies Inc
IEEE Transactions on Energy Conversion | Year: 2010

Acomprehensive model of a salient-pole synchronous machine is developed for a real-time environment. By obtaining the effective specific permeance of the machine fromsimple experimental measurements and the exact geometry of the rotor pole arc, a model is developed that includes the exact distribution of windings and operating-point-dependent saturation. This model offers a superior simulated response of the machine for fault transients, as well as for steady-state harmonic behavior, and is suitable for the closed-loop testing of relays and controls. The inductances of the machine are computed using the modified winding function approach and validated using finite-element analysis. Finally, the performance of the model is validated under healthy and faulted conditions by comparison with tests on an actual machine. © 2010 IEEE.

Chen Y.,RTDS Technologies Inc. | Dinavahi V.,University of Alberta
IET Generation, Transmission and Distribution | Year: 2013

Large-scale electromagnetic transient simulation of power systems in real-time using detailed modelling is computationally very demanding. This study introduces a multi-field programmable gate array (FPGA) hardware design for this purpose. A functional decomposition method is proposed to map FPGA hardware resources to system modelling. This systematic method lends itself to fully pipelined and parallel hardware emulation of individual component models and numerical solvers, while preserving original system characteristics without the need for extraneous components to partition the system. Proof-of-concept is provided in terms of a 3-FPGA and 10-FPGA real-time hardware emulation of a three-phase 42-bus and 420-bus power systems using detailed modelling of various system components and iterative non-linear solution on a 100 MHz FPGA clock. Real-time results are compared with offline simulation results, and conclusions are derived on the performance and scalability of this multi-FPGA hardware design. ©The Institution of Engineering and Technology 2013.

Chen Y.,RTDS Technologies Inc. | Dinavahi V.,University of Alberta
IEEE Transactions on Industrial Informatics | Year: 2014

This paper proposes digital hardware building block concept for emulating power system networks on field-programmable gate arrays (FPGAs) in real time. Basic hardware emulation building blocks (HEBBs) for machines, transmission lines, nonlinear elements, and loads are presented to demonstrate how real-time simulation can be achieved for realistic power systems. All of the hardware modules were developed using the VHDL language for portability and extensibility. Employing multiple FPGAs, a large-scale power system consisting of 1260 three-phase buses is modeled in detail in real time to show both electromagnetic transients and electromechanical dynamics in the system. The advantage of HEBB-based modeling is that the design and development of new technologies can be accelerated by utilizing massive real-time digital simulators capable of modeling multiscale and multidomain dynamics. © 2005-2012 IEEE.

Nzimako O.,RTDS Technologies Inc. | Wierckx R.,RTDS Technologies Inc.
2015 Clemson University Power Systems Conference, PSC 2015 | Year: 2015

This paper discusses the modeling and simulation of a grid-integrated photovoltaic system using a real time digital simulator. The mathematical modeling and derivation of the parameters of the PV array using an analytical and iterative procedure is discussed. The PV array is interfaced to a three-phase grid using a sinusoidal pulse width modulated voltage source converter with maximum power point tracking. A decoupled dq current control strategy is used to control the real and reactive power exchanged between the PV system and the grid. An analysis of the real-time operation of the photovoltaic system is presented. © 2015 IEEE.

Nzimako O.,RTDS Technologies Inc | Wierckx R.,RTDS Technologies Inc
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society | Year: 2015

Stability and accuracy of PHIL simulation depends upon the characteristics of the interface between the RTS and the hardware device under test. Even when stable PHIL is achieved, the non-idealities in the PHIL interface introduces inaccuracies in the simulation results. Software models that include representation of the PHIL interface provide a method to evaluate the stability and accuracy of a PHIL interface. In most instances the required parameters and circuit topology of the power devices that are to be tested are unavailable, thus making it difficult to prepare the required software models. This paper will discuss the challenges of evaluating the stability and accuracy of a PHIL simulation with a grid-connected photovoltaic micro-inverter whose parameters and converter topology are unknown. © 2015 IEEE.

Wierckx R.,RTDS Technologies Inc. | Elimban S.,RTDS Technologies Inc.
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society | Year: 2015

Simulation tools are necessary to research and develop modular multi-level converter (MMC) based HVDC systems for the future power grid. Real-time simulators offer the ability to connect to real physical equipment in a hardware-in-loop (HIL) scheme to test and design controllers, protection systems and encompass the complete operation and response of an HVDC system. The complexity of an MMC valve poses challenges for real-time modelling. For the RTDS Simulator, a surrogate network topology is used to model MMC valves to reduce the computational requirements of the valve model but still maintain the accuracy of a real valve. To model up to 512 submodules (SMs) per valve at a time-step as small as 2.5 μsec, Field Programmable Gated Array (FPGA) are used to compute the MMC valve model and is interfaced to the main RTDS hardware. To demonstrate the performance and accuracy of the FPGA-based MMC valve model, comparison results are provided between the RTDS and PSCAD simulation of a point-to-point link for AC and DC faults. © 2015 IEEE.

Zhang Y.,RTDS Technologies Inc. | Gole A.M.,University of Manitoba
IET Seminar Digest | Year: 2015

This paper compared the transient performance of Synchronous Condenser and Static Compensator (STATCOM) at HVDC systems. The impacts of the two reactive power compensators to the connected HVDC system during various aspects of transients, including fault recovery, temporary over voltage and commutation failure, are investigated based on Electromagnetic Transients (EMT) Simulation. The study results demonstrated that STATCOMs and SCs have the similar performance during those transients.

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