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.
Highlights
The electromagnetic transients program (EMTP) has been widely used for real-time simulation of power systems [1], verifying the control strategy [2], and detecting the operational status [3]
Under the Multi-Area Thevenin Equivalents (MATE)-based parallel simulation architecture, those changing components could be treated as links between subnets in order to ensure the admittance matrix is constant during the entire simulation process
A multi-rate and parallel electromagnetic transient simulation method considering nonlinear characteristics of a power system is proposed, which aims at improving the simulation efficiency further
Summary
The electromagnetic transients program (EMTP) has been widely used for real-time simulation of power systems [1], verifying the control strategy [2], and detecting the operational status [3]. Under the MATE-based parallel simulation architecture, those changing components could be treated as links between subnets in order to ensure the admittance matrix is constant during the entire simulation process This method has the following problems: On the one hand, this network division method may result in an extremely uneven subnet scale. Multilevel MATE is proposed in [7] This method guarantees the admittance matrix is constant by eliminating branches with changing parameters, and this process is done in the subnet calculation unit. A multi-rate and parallel electromagnetic transient simulation method considering nonlinear characteristics of a power system is proposed, which aims at improving the simulation efficiency further.
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