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- September 27, 2017September 27, 2017
36 NovaCor units will be added to the existing simulator installation at SGEPRI / NARI, making NARI the owner of the world’s largest and most capable real time power system simulator
RTDS Technologies has been selected as the provider of a record-breaking expansion project to the real time power system simulation laboratory at State Grid Electric Power Research Institute (SGEPRI) / NARI in Nanjing, China. The project will see 36 NovaCor units added to the existing simulation facility, giving the laboratory a total of 40 NovaCor units and 16 GTWIF/PB5-based racks. This makes NARI’s RTDS Simulator the world’s largest and most capable real time power system simulator.
RTDS Technologies won the project, having competed with HYPERSIM as marketed by OPAL-RT and Keliang Technology. NARI’s many years of successful experience with the technology and world class simulation support from the manufacturer meant that the RTDS Simulator emerged as the technology of choice.
NARI was an early adopter of real time power system simulation, having been one of the first two companies in China to invest in RTDS Simulator hardware over twenty years ago. Over time, NARI acquired 16 RTDS Simulator racks which have been successfully used to support their work in the design and functional and dynamic testing of protection, automation, control, HVDC, and FACTS systems. More recently, upon the release of the new generation of simulation hardware for the RTDS Simulator, NARI acquired 4 NovaCor™ units to increase their simulation capabilities.
The record-breaking expansion project at NARI will see the addition of 36 NovaCor units to the existing simulation facility. NovaCor is the most powerful generation of simulation hardware for the RTDS Simulator – based on a multicore processor, the NovaCor platform allows users to simulate larger and more complex networks than ever before. NARI’s RTDS Simulator is now capable of simulating systems comprised of more than 3600 three-phase buses and 20 HVDC links. The simulation hardware will be the critical tool at the heart of NARI’S SGCC System Protection Key Lab, where it will be used for validating system-level protection schemes, including wide area protection and control, AC and multiple HVDC coordination, and system stability control. NARI is among many of the world’s leading research, development, and testing institutes adopting the NovaCor technology to enhance their real time power system simulation capabilities.
Throughout the last twenty years, the RTDS Simulator has played a key role in the rapid and successful expansion of China’s power system infrastructure, allowing in-depth investigation and study of some of the most complex and interdependent power systems in the world. All of the HVDC and UHVDC links in China have been tested using the RTDS Simulator, including Tian-Guang, Gui-Guang, Yun-Guang UHVDC, Shang-Shan UHVDC, Ji-Quan UHVDC, Ling-Shao UHVDC, and Jiu-Hu UHVDC. More recently, as complex, modular multi-level converters (MMC) have emerged as a critical technology in the HVDC field, the RTDS Simulator has been used in the control and interaction studies of all MMC-based HVDC projects in China. This includes Zhou-Shan 5 Terminal MMC HVDC, Xia-Men Bipole MMC HVDC, Luo-Ping Back to Back MMC HVDC, Yu-E MMC HVDC Links, and more.
The RTDS Simulator will meet NARI’s requirement that the 16 existing simulator racks be compatible with the new hardware supplied for the project. NovaCor is fully compatible with the previous GTWIF-based racks. NARI can leverage this compatibility to perform very large-scale simulations involving all simulation equipment on site simultaneously if desired. RTDS Technologies’ design philosophy, which ensures compatibility between hardware generations, will allow NARI to use the combined system to the best of its capability.
RTDS Technologies will provide comprehensive on site training as well as ongoing simulation support services in order to ensure that NARI continues to make successful use of real time simulation to support the development and critical testing of their equipment. RTDS Technologies is proud to be supporting NARI in the establishment of a world class simulation facility for these critical design and operational studies.
- July 26, 2017July 26, 2017
RTDS Technologies is pleased to announce that the upcoming RTDS Simulator Advanced Applications Training Course, which will focus on IEC 61850 and GTNET applications, will be held as a joint training course in conjunction with the world-renowned IEC 61850 University. This first-ever collaboration course with IEC 61850 University is an unmissable opportunity for RTDS Simulator users who want the best information on using IEC 61850 in conjunction with their real time simulations.
The course will take place from September 25 to 29, 2017, in Winnipeg, Canada – the world headquarters of RTDS Technologies. It will focus on the fundamentals and principles of the IEC 61850 standard and its related applications, and will include three full days of hands on exercises using IEC 61850 with the RTDS Simulator. This will be the first training course worldwide in which trainees will use the all-new RTDS Simulator Protection and Automation Suite. Topics, exercises, and demonstrations include the following:
- IEC 61850 guiding principles and structure of standard
- IEC 61850 system architecture and data models
- IEC 61850 project specification, engineering and commissioning, conformance, and project examples
- Configuring IEC 61850 Sampled Values and GOOSE data streams via the GTNETx2 card for the RTDS Simulator
- Closed-loop testing of a physical relay using IEC 61850 GOOSE and Sampled Values streaming from and to the RTDS Simulator
- Use of the RTDS Simulator’s Protection and Automation Suite for simulation of IEC 61850 MMS Servers
This course is targeted at experienced RTDS Simulator users. A fundamentals course on using the RTDS Simulator and the RSCAD software will be hosted the previous week (September 18 to 22) in Winnipeg. Click here for more information on the courses.
Meet the course instructors:
Lead Simulation and Automation Engineer, RTDS Technologies
Eric Xu joined RTDS in 2009, and since then has been involved in technical support, user training, and GTNET component model development. Eric is a Registered Professional Engineer and a member of IEEE. He is also an active member of IEC Technical Committee 57 Working Group 10 which is the section working on the development of the communication standards for substations – functional architecture and general requirements.
Managing Director, Tesco Automation
Dustin Tessier is the Managing Director for Tesco Automation, which is a system integrator specializing in the engineering, procurement, and commissioning of PAC and SCADA systems, with a particular focus on IEC 61850 based systems. He is a member of IEC Technical Committee 57 Working Group 10 and chair to the IEC Smart Grid Systems Committee and is actively involved with the ongoing development of the IEC 61850 standard.
- July 26, 2017July 26, 2017
Our most recent edition of RTDS News is now available for download. The July News features our new product: NovaCor! We’re excited to be talking about this new hardware platform and to announce the first commercial installation of NovaCor at Scotland’s National HVDC Centre. To compliment the release of NovaCor, we have new software updates and features in RSCAD, all of which you can read about in this edition of RTDS News. Download your copy!
- July 14, 2017July 14, 2017
Part 1: The Nature of the Problem!
Simulation of power systems using electromagnetic transients (EMT) programs provides the user with a very powerful tool to study the behavior of the system over a wide range of operating conditions and frequencies. An EMT simulator capable of continuous real-time operation has the added benefit of allowing interconnection of physical control and protection equipment to the simulation and thereby provide the opportunity to observe the operation of the physical equipment and interaction with the system.
When faced with the task of preparing a model of the power system that will be used to test a particular device or to investigate some system behavior, the studies engineer must decide how much of the system needs to be represented in detail, how much can be represented by an equivalent and what can be ignored. The required fidelity of the model, the nature of the study, the size of the model that can practically be represented on the available computer hardware and the availability of reliable data all contribute to the development of the model.
It is often the case that an ideal source behind an impedance (see Figure 1) is placed a few buses away from the area of interest to represent the portion of the system that is not represented in detail. The source impedance is chosen so that it represents the short circuit impedance at that bus and the source magnitude and angle are set to match a given load flow condition. Such an equivalent does not contemplate component dynamics, frequency dependence, zero sequence impedance or that system may not be completely radial.
Although there may be circumstances where such an equivalent is adequate, there are situations where it is not suitable and may well lead to unrealistic results. Take, for example, the system shown in Figure 2.
Here two simulation cases are run, one with a detailed generator model at G4 and one where generator G4 is replaced with the simple equivalent of Figure 1. The impedance of the equivalent is calculated by considering the series combination of the stator resistance, d-axis transient reactance and generator transformer reactance. The source voltage magnitude and angle were calculated from a solved loadflow. As can be seen from the plots of Figure 3, initial steady-state power flows for the two cases are the same. However, when an event causes a transmission line to be removed both the dynamics and the resultant new steady-state conditions are quite different for the two cases. In the case with the detailed model, generator controls act to ensure that the generator power and voltage set-points are met and a new load flow is established. With the system equivalent the source voltage and angle remain constant and the new load flow that is established results in the system equivalent at G4 absorbing real power. Since the connection at G4 has only generation the case with the system equivalent has come to a non-realistic operating condition.
The example here is contrived and it would be unusual to replace a single generator with an equivalent. Such non-realistic operating conditions, however, have been observed in more realistic cases where the system equivalent represents a more complex portion of the system.
A disturbance in the system of Figure 2 would result in a swing of the generator rotors relative to the system. Typically, the generator swings damp out and new rotor angles are established. Under severe conditions a generator swing could be such that the generator loses synchronism with the rest of the system. An equivalent that includes an ideal source does not exhibit such power swings and thus could provide unrealistic and optimistic results. Since the impact of the disturbance diminishes with distance and generators with large inertia more closely approximate ideal sources there are circumstances where simple system equivalents are suitable. Determining when and where such equivalents can be used requires engineering judgement.
Stay tuned for future posts which will highlight different techniques that are available for the creation of system equivalents, where such techniques are suitable and their advantages and disadvantages. Should you have any questions, please do not hesitate to contact us at email@example.com.
Author: Arunprasanth Sakthivel
- June 22, 2017June 22, 2017
Our Simulation Specialists are travelling to Korea for two upcoming conferences!
Join us at IPST – the International Conference on Power Systems Transients, in Seoul from June 26th to 29th! We are proud to once again be the main sponsors of this event! Stop by our booth during exhibition hours for a demonstration of NovaCor, our new generation of simulation hardware! We are also participating in Technical Session 11B on Real-Time Simulation, taking place on Thursday, June 29th at 10:30am in the New Millennium Hall. Our simulation experts Hui Ding, Yi Zhang, Dinesh Gurusinghe, Dean Ouellette and Ali Dehkordi have all contributed to this technical session through multiple presentations.
Our next stop is the Korean Institute of Power Electronics Summer Conference! This annual event is taking place July 4 – 6, 2017 at the Gyeongju Hanwha Resort in Gyeongbuk. Please stop by our booth during exhibition hours where our simulation expert, In-Kwon Park, will be demonstrating NovaCor and the GTFPGA unit, focusing on Power Electronics and STATCOM simulations.
We hope to see you in Korea!