Wei Li
Publication date : Feb 2012
Paper File :
PES12_MMCSTATCOM.pdf
Authors
Jean Bélanger, Wei Li, Luc-André Gregoire, Abstract
Due to its unique topology, the Modular Multilevel STATCOM has many advantages but requires a sophisticated controller and puts higher requirements on simulation tools. To simulate the STATCOM in real-time is preferable because it enables hardware-in-the-loop test of the system in various scenarios including extreme fault conditions, which cannot be tested on a real STATCOM. This paper presents a model of full-bridge sub-module which enables fast offline and real-time simulation of the STATCOM. A control scheme with a new SM capacitor voltage balancing method is also proposed in this paper. The model and the controller are investigated for different operating conditions. Implemented in a real-time simulator, the model can be simulated in real time at a time step of 20 µs, 131 times faster than its reference model. As demonstrated by the results, the proposed control scheme is effective and robust.
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Publication date : Aug 2011
Paper File :
Control and Performance of a modular multilevel converter system.pdf
Authors
Jean Bélanger, Luc-André Gregoire, Wei Li, Abstract
The Modular Multilevel Converter (MMC) system has many advantages over conventional voltage source converters and therefore can be used in dc power transmission, micro grid, or renewable energy applications. While MMC’s distinctive topology offers many new features, it also necessitates a sophisticated controller to deal with extra control requirements. This paper presents a control scheme with multiple control objectives required by MMC, i.e. active and reactive power control, dc voltage control, sub-module capacitor voltage control and balancing, circulating current eliminating, and zero-sequence current eliminating. The system is modeled in an electromagnetic transients program, RT-LAB, and its dynamic performance is evaluated by time-domain studies using a real-time simulator, eMEGAsim. The results show the multiple control objectives are fulfilled and the system has fast response to control command and system dynamics
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Publication date : Apr 2011
Paper File :
Validation of a 60-Level Modular Multilevel.pdf
Authors
Wei Li, Luc-André Gregoire, Laurence Snider, Jean Bélanger, Abstract
In this paper, full real-time digital simulation of a static modular multilevel converter (MMC) HVDC link interconnecting two AC networks is discussed. The converter has 60 cells per arm; each cell has two power switches with antiparallel diodes and one capacitor. The simulated model can be used to study the natural rectifying mode, which is very important in the energizing process of the converter, whether a ramping voltage or a charging resistance is used. The model also incorporates a simple controller to show the system behavior in different operating conditions. The converter model and the controller are simulated on two independent real-time simulators and connected though their respective IO and physical signal cables to perform Hardware-in-the-Loop testing. All capacitor voltages are supplied to the controller using digital to analog converters. Firing signals from the controller are sent using digital signals with opto-couplers, as would be the case with a real setup. By doing so, a Hardware-in-the-Loop (HIL) simulation is obtained. The main challenges of this setup are the very high number of IOs, which reaches over 730, considering both controller and converter, and the processing power required to simulate the 360 cells within a small time-step of 50 μs or less, as required for electromagnetic transient analysis. The simulation is achieved with a time-step of 20 μs using 10 INTEL 3.2-Ghz processor cores. Different faults are applied to determine their effects on the controller and the converter. In order to produce results that are as realistic as possible, a saturable transformer is used; the impact is particularly noticeable during faults and unbalanced load. The real-time digital simulator used is based on MATLAB, SIMULINK, SimPowerSystems and eMEGAsim.
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Publication date :
Paper File :
EMTP-RT.pdf
Authors
Wei Li, Laurence A. Snider, Jean-Nicolas Paquin, Jean Bélanger, Claudio Pirolli, Abstract
This paper describes a versatile, multi-domain, real-time digital simulator of large power grids. Its capability to
conduct multiple tests for protection coordination studies is described. A large grid model built using the EMTP-RV software
and simulated in real-time using the eMEGAsim real-time digital simulator and EMTP-RT software tool is described.
Comparisons between off-line and real-time simulations with different solvers are made using superimposed steady-state and
fault condition waveforms. A multiple random tests application for protection coordination studies using eMEGAsim simulator’s
built-in software TestDrive GUI and Python API scripting tool is described. The paper concludes with a discussion on the off-line,
real-time and acceleration modes of simulation of the PC-based eMEGAsim simulator and its advantages for studies of modern
power systems.
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This video presents a 330-bus power system model that can be simulated in Real-Time on the eMEGAsim Real-Time Simulator
Publication date : May 2009
Paper File :
RealTime_Simulation_of_HVDC_Systems_with_eMEGAsim_3rdEdition.pdf
Authors
Wei Li, Jean-Nicolas Paquin, Jean Bélanger, Abstract
This document provides users with benchmark models to evaluate the OPAL-RT Technologies system configuration needed to develop research models for the following three HVDC transmission systems:
• Bipolar HVDC model,
• Monopolar back-to-back HVDC system based on the First CIGRE benchmark for HVDC control studies [1], and
• Multi-Terminal HVDC System.
The controllers and protections implemented in these models are described. Simulation results with additional comments are provided to demonstrate the feasibility of these models.
The studied systems are modeled in an environment that integrates Simulink/SimPowerSystems (SPS) with the eMEGAsim simulation platform, which incorporates the ARTEMiS software for solving of the real-time simulated model and the RTeDrive and RT-Events blocksets. This platform enables the simulation of increasingly large systems with real-time performance across multiple CPUs.
Through the use of the TestDrive graphical user interface platform from OPAL-RT Technologies, it is also demonstrated that observing results and modifying parameters and conditions on a real-time simulated model is both easy and user friendly.
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