The Experts below are selected from a list of 19170 Experts worldwide ranked by ideXlab platform
Venkata Dinavahi - One of the best experts on this subject based on the ideXlab platform.
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fine grained network decomposition for massively parallel Electromagnetic Transient simulation of large power systems
Power and Energy Society General Meeting, 2018Co-Authors: Zhiyin Zhou, Venkata DinavahiAbstract:Electromagnetic Transient (EMT) simulation is one of the most complex power system studies that requires detailed modeling of the study system including all frequency-dependent and nonlinear effects. Large-scale EMT simulation is becoming commonplace due to the increasing growth and interconnection of power grids, and the need to study the impact of system events of the wide area network. To cope with enormous computational burden, the massively parallel architecture of the graphics processing unit (GPU) is exploited in this paper for large-scale EMT simulation. A fine-grained network decomposition, called shattering network decomposition, is proposed to divide the power system network exploiting its topological and physical characteristics into linear and nonlinear networks, which adapt to the unique features of the GPU-based massive thread computing system. Large-scale systems, up to 240 000 nodes, with typical components, including synchronous machines, transformers, transmission lines, and nonlinear elements, and multiple levels modular multilevel converter with up to 6144 submodules, are tested and compared with mainstream simulation software to verify the accuracy and demonstrate the speed-up improvement with respect to sequential computation.
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nonlinear magnetic equivalent circuit based real time sen transformer Electromagnetic Transient model on fpga for hil emulation
Power and Energy Society General Meeting, 2017Co-Authors: Jiadai Liu, Venkata DinavahiAbstract:Strategic power-flow control using a Sen transformer (ST) can be a robust and cost-effective solution to relieve grid congestion due to increased installation of renewables. The ST consists of a multiwinding transformer and tap changer that can regulate the power flow through a transmission line by injecting a series-connected controllable voltage. This paper develops a realtime high-fidelity magnetic equivalent circuit-based Electromagnetic Transient model for the ST on the field-programmable gate array (FPGA) for hardware-in-the-loop applications. This geometry-based model was developed to depict the major flux paths in the transformer core, and complex nonlinear phenomena, such as saturation, hysteresis, and eddy currents. The entire real-time ST model and other power system components are emulated by hardware description language, employing the 32-b floating point precision on the FPGA chip. A fully paralleled and pipelined hardware architecture is developed to achieve accurate real-time emulation as well as the lowest latency and smallest hardware resource consumption. The real-time results are validated against 3-D finite-element simulation using JMAG software.
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Electromagnetic Transient simulation of CIGRÉ DC grid test system with hybrid converter topologies
2017 IEEE Power & Energy Society General Meeting, 2017Co-Authors: Zhuoxuan Shen, Ning Lin, Venkata DinavahiAbstract:Voltage source converter (VSC) based HVDC projects are being increasingly built and operated globally, providing the potential to construct a meshed DC supergrid. The CIGRE DC grid test system is a benchmark for research and analysis with power system topologies and parameters. This paper presents the Electromagnetic Transient simulation using detailed switching devices for the complete test system modeling composed of multiple converter topologies, including two-level (2L) converters, three-level neutral-point-clamped (3LNPC) converters, modular multi-level converters (MMCs) with up to 401 levels, and four-quadrant (4Q) DC-DC converters in PSCAD/EMTDC®. This paper proposes the scheme to combine the piecewise linearized tangential curve fitting of IGBT and diode characteristics with the Thevenin equivalence based MMC modeling scheme to increase the accuracy, which can also present the power losses of the IGBT modules. Dynamic analyses, including AC and DC faults, are conducted presenting the results from various converter stations.
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detailed magnetic equivalent circuit based real time nonlinear power transformer model on fpga for Electromagnetic Transient studies
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Venkata DinavahiAbstract:A detailed power transformer Electromagnetic Transient model would help in accurately predicting Transient stresses and formulating adequate protection strategies in power systems. This paper presents a real-time nonlinear high-resolution magnetic equivalent circuit (HR-MEC) based transformer model on the field-programmable gate array for hardware-in-the-loop simulation. This model is inspired by the mesh generated in finite-element method (FEM) tools to depict the major flux paths in the transformer. All of the major nonlinear phenomena such as saturation, hysteresis, and eddy currents are captured in the transformer hardware emulation whose modules were developed in a 32-b floating point precision VHDL. The developed HR-MEC model and nonlinear numerical solution have been fully parallelized in hardware to achieve the lowest latency in the real-time implementation. The hysteresis in the transformer core is modeled using Preisach theory, and eddy currents are incorporated using a frequency-dependent network. The real-time results are validated using 3-D FEM analysis in JMAG software.
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parallel massive thread Electromagnetic Transient simulation on gpu
IEEE Transactions on Power Delivery, 2014Co-Authors: Zhiyin Zhou, Venkata DinavahiAbstract:The Electromagnetic Transient (EMT) simulation of a large-scale power system consumes so much computational power that parallel programming techniques are urgently needed in this area. For example, realistic-sized power systems include thousands of buses, generators, and transmission lines. Massive-thread computing is one of the key developments that can increase the EMT computational capabilities substantially when the processing unit has enough hardware cores. Compared to the traditional CPU, the graphic-processing unit (GPU) has many more cores with distributed memory which can offer higher data throughput. This paper proposes a massive-thread EMT program (MT-EMTP) and develops massive-thread parallel modules for linear passive elements, the universal line model, and the universal machine model for offline EMT simulation. An efficient node-mapping structure is proposed to transform the original power system admittance matrix into a block-node diagonal sparse format to exploit the massive-thread parallel GPU architecture. The developed MT-EMTP program has been tested on large-scale power systems of up to 2458 three-phase buses with detailed component modeling. The simulation results and execution times are compared with mainstream commercial software, EMTP-RV, to show the improvement in performance with equivalent accuracy.
Peng Qian - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Transient and electromechanical Transient hybrid real time simulation method based on rtds cbuilder
Power system technology, 2009Co-Authors: Peng QianAbstract:Based on real time digital simulator (RTDS),a hybrid real-time simulation method for Electromagnetic Transient and electromechanical Transient is proposed. In the environment of RTDS/Cbuilder and by use of multithreading and doubly linked list-sparse matrix,a real-time electromechanical Transient simulation program is developed. The equivalent circuit models of network interface at Electromagnetic side and that at electromechanical side are put forward,and the connection between RTDS Electromagnetic model and real-time electromechanical Transient program is implemented,thus a hybrid real-time simulation platform is built. When the power grid containing DC power transmission is analyzed in detail,the impact of AC power system on Transient stability can also be considered accurately. Simulation results show that the proposed hybrid real-time simulation method is valid and efficient.
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Electromagnetic Transient and Electromechanical Transient Hybrid Real-Time Simulation Method Based on RTDS/CBuilder
Power system technology, 2009Co-Authors: Peng QianAbstract:Based on real time digital simulator (RTDS),a hybrid real-time simulation method for Electromagnetic Transient and electromechanical Transient is proposed. In the environment of RTDS/Cbuilder and by use of multithreading and doubly linked list-sparse matrix,a real-time electromechanical Transient simulation program is developed. The equivalent circuit models of network interface at Electromagnetic side and that at electromechanical side are put forward,and the connection between RTDS Electromagnetic model and real-time electromechanical Transient program is implemented,thus a hybrid real-time simulation platform is built. When the power grid containing DC power transmission is analyzed in detail,the impact of AC power system on Transient stability can also be considered accurately. Simulation results show that the proposed hybrid real-time simulation method is valid and efficient.
Zhao Jin - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Transient-Transient Stability Analysis Hybrid Real-Time Simulation Method of Variable Area of Interest
Energies, 2018Co-Authors: Bingda Zhang, Shipei Nie, Zhao JinAbstract:To make the object of Electromagnetic Transient (EMT) simulation flexible to change, the authors propose using the method of Electromagnetic Transient-Transient stability analysis (TSA) hybrid real-time simulation of the variable area of interest. The area where the fault is to be set, or where the operation takes place, is defined as the area of interest. The simulation object is divided into multiple sub-networks. The EMT simulation range is determined according to the voltage drop depth at the boundary of the adjacent sub-network caused by the three-phase short-circuit fault at the boundary of an area of interest. The Norton equivalent is obtained by using the sub-network as a basic unit. The Electromagnetic sub-network forms its own Norton equivalent on the TSA side by means of the Norton equivalent admittance of its TSA model. Based on this, the overall framework of hybrid real-time simulation of the variable area of interest is constructed. The fundamental phasor prediction and Norton equivalent current source prediction are adopted to reduce the interface error. The performance of the proposed method in terms of feasibility, flexibility, and effectiveness have been verified by the simulation studies on the IEEE 118-bus system.
Yuan Chen - One of the best experts on this subject based on the ideXlab platform.
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multi fpga digital hardware design for detailed large scale real time Electromagnetic Transient simulation of power systems
Iet Generation Transmission & Distribution, 2013Co-Authors: Yuan Chen, Venkata DinavahiAbstract: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.
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Digital hardware emulation of universal machine and universal line models for real-time Electromagnetic Transient simulation
2012 IEEE Power and Energy Society General Meeting, 2012Co-Authors: Yuan Chen, Venkata DinavahiAbstract:Real-time Electromagnetic Transient simulation plays an important role in the planning, design, and operation of power systems. Inclusion of accurate and complicated models, such as the universal machine (UM) model and the universal line model (ULM), requires significant computational resources. This paper proposes a digital hardware emulation of the UM and the ULM for real-time Electromagnetic Transient simulation. It features accurate floating-point data representation, paralleled implementation, and fully pipelined arithmetic processing. The hardware is based on advanced field-programmable gate array (FPGA) using VHDL. A power system Transient case study is simulated in real time to validate the design. On a 130-MHz input clock frequency to the FPGA, the achieved execution times for UM and ULM models are 2.5 μs and 1.42 μs, respectively. The captured real-time oscilloscope results demonstrate high accuracy of the emulator in comparison to the offline simulation of the original system in the EMTP-RV software.
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an iterative real time nonlinear Electromagnetic Transient solver on fpga
Power and Energy Society General Meeting, 2011Co-Authors: Yuan Chen, Venkata DinavahiAbstract:Real-time Transient simulation of nonlinear elements in transmission networks requires significant computational power. This paper proposes an iterative nonlinear Transient solver on a field programmable gate array (FPGA). The parallel solver, based on the compensation method and the Newton-Raphson algorithm (continuous and piece-wise), is entirely implemented in VHDL. It also involves sparsity techniques, deeply pipelined arithmetic floating-point processing, and parallel Gauss-Jordan elimination. To validate the new solver, two case studies are simulated in real-time: surge arrester Transients in a series compensated line and ferroresonance Transients in a transformer, with time-steps of 5μs and 3μs respectively. The captured real-time oscilloscope results demonstrate high accuracy of the simulator in comparison to the off-line simulation of the original system in the ATP version of EMTP.
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an iterative real time nonlinear Electromagnetic Transient solver on fpga
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Yuan Chen, Venkata DinavahiAbstract:A real-time Transient simulation of nonlinear elements in transmission networks requires significant computational power. This paper proposes an iterative nonlinear Transient solver on a field-programmable gate array. The parallel solver, based on the compensation method and the Newton-Raphson algorithm (continuous and piecewise), is entirely implemented in Very high speed integrated circuit Hardware Description Language. It also involves sparsity techniques, deeply pipelined arithmetic floating-point processing, and parallel Gauss-Jordan elimination. To validate the new solver, two case studies are simulated in real time: surge arrester Transients in a series-compensated line and ferroresonance Transients in a transformer, with time steps of 5 and 3 μs, respectively. The captured real-time oscilloscope results demonstrate high accuracy of the simulator in comparison to the offline simulation of the original system in the ATP version of Electromagnetic Transient program.
Hong Chao - One of the best experts on this subject based on the ideXlab platform.
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digital computer electromechanical Transient and rtds Electromagnetic Transient hybrid real time simulation system
Power system technology, 2008Co-Authors: Hong ChaoAbstract:The authors conduct the real-time interface of electromechanical Transient simulation with Electromagnetic Transient simulation, so in a once-through simulation the electromechanical Transient simulation of large-scale power grid and the Electromagnetic Transient simulation of partial power network can by simultaneously implemented. Besides, a hybrid real-time simulation platform composed by digital computer and real-time digital simulator (RTDS) is designed; the key techniques of this platform are researched, mainly including how to build equivalent circuit of the opposite system and how to interchange data between the two simulation subsystems. New thinking to solve relevant problems are put forward the equivalent module should rightly reflect the status of the opposite system and simplify the lesser important factor.