Abstract
Electromechanical transient (EMT) and transient stability hybrid simulations can make full use of their fast-solving ability and high-precision computing ability to accurately simulate the dynamic characteristics of large-scale AC/DC systems. This paper selects the bus as the hybrid simulation interface bus in the AC system near the DC system, which can effectively improve the simulation accuracy of the AC/DC system interaction. At the interface bus, Norton equivalent and Thevenin equivalent are applied to the EMT simulation side and electromechanical transient simulation side, respectively. The three-phase simulation data and three-sequence component simulation data are extracted respectively, and the serial iteration method is used for hybrid simulation calculation. This paper takes Zhangbei multi terminal AC/DC system as an example, compares the hybrid simulation results with the EMT simulation results, and tries to verify the accuracy and effectiveness of the hybrid simulation method.
Highlights
With the proliferation of VSC-HVDC (Voltage Source Converter High Voltage Direct Current) based on power electronic devices, the influence of such fast responding devices on the AC/DC hybrid transmission system has become a research hotspot (Huang and Vittal, 2017a,b; Liming and Bo, 2020; Li et al, 2021)
This section reports simulation results obtained with the Zhangbei multi-terminal VSC-HVDC transmission system which had been put into operation in 2020
This paper has proposed a hybrid simulation method based on MATLAB/Simulink
Summary
With the proliferation of VSC-HVDC (Voltage Source Converter High Voltage Direct Current) based on power electronic devices, the influence of such fast responding devices on the AC/DC hybrid transmission system has become a research hotspot (Huang and Vittal, 2017a,b; Liming and Bo, 2020; Li et al, 2021). It is noteworthy that users can flexibly add user-defined models, including generator models, governor models, exciter models, and different kinds of user-provided Ordinary Differential Equation (ODE) solvers While it is used in the hybrid simulation as a TS simulation program, the versatility of script files and flexibility of user-defined function will be beneficial for the follow-up research work. It is worth mentioning that the AC system fault has a great influence on the VSC-MTDC system, especially when its fault point is nearby to the converter bus In this case, the common scheme for hybrid simulation could not simulate the dynamic characters of the AC/DC system before or after the fault happens accurately.
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