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Energies 2018, 11(2), 468; https://doi.org/10.3390/en11020468

Multi-Rate and Parallel Electromagnetic Transient Simulation Considering Nonlinear Characteristics of a Power System

1
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
State Grid Jiangsu Electric Power Co., LTD, Nanjing 210000, China
3
State Key Laboratory of Power Grid Security and Energy Conservation, China Electric Power Research Institute, Haidian District, Beijing 100192, China
*
Author to whom correspondence should be addressed.
Received: 27 November 2017 / Revised: 24 January 2018 / Accepted: 31 January 2018 / Published: 23 February 2018
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Abstract

The electromagnetic transient simulation of a power system with nonlinear characteristics is very time-consuming due to numerous inversion calculations of the admittance matrix. To speed up the simulation of the power system with nonlinear characteristics, a multi-rate and parallel electromagnetic transient simulation method is proposed. Firstly, a Multi-Area Thevenin Equivalents (MATE)-based parallel algorithm considering nonlinear characteristics of the power system is proposed. This method guarantees the admittance matrix is constant by considering changing branches as link current without dividing the subnet again. Secondly, considering the differences of the time constant of the AC/DC subnet, different simulation steps are used for these subnets. The Lagrange interpolation method is used for calculating the Thevenin voltage of the AC subnet in non-synchronous time. Calculation methods of the DC subnet Thevenin voltage is proposed by considering the simulation results during the entire large simulation step. Finally, the simulation process is optimized for improving the simulation efficiency further. The simulation results show that the proposed method could greatly improve the simulation efficiency without losing simulation accuracy too much compared with the traditional method. View Full-Text
Keywords: electromagnetic transient simulation; efficiency; nonlinear characteristics; multi-rate; parallelism electromagnetic transient simulation; efficiency; nonlinear characteristics; multi-rate; parallelism
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Han, J.; Miao, S.; Yu, J.; Dong, Y.; Hou, J.; Duan, S.; Li, L. Multi-Rate and Parallel Electromagnetic Transient Simulation Considering Nonlinear Characteristics of a Power System. Energies 2018, 11, 468.

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