Method and system for multi-band dynamic phasor electromagnetic transient simulation of voltage source converter

Abstract

The invention discloses a multi-frequency-band dynamic phasor electromagnetic transient simulation method and system for a voltage source converter, which relates to the field of power system analysis and mainly includes: obtaining electrical signals of a voltage source converter; according to the DC side voltage signal and Establish the switching function of each switching device based on the AC side voltage signal of each switching device; establish a voltage source converter based on the switching function of each switching device, the three-phase voltage signal on the AC side of the grid, the three-phase current signal on the AC side of the grid, and the voltage signal on the DC side model; use the multi-band dynamic phasor method to process the voltage source converter model, and establish the multi-band dynamic phasor electromagnetic transient simulation model of the voltage source converter; the multi-band dynamic phasor of the voltage source converter The electromagnetic transient simulation model is simulated with a large step size, and the simulation results are obtained. The multi-band dynamic phasor electromagnetic transient simulation method and system of the voltage source type converter disclosed by the invention can effectively take into account the accuracy and efficiency of the simulation.

Description

technical field [0001] The invention relates to the field of power system analysis, in particular to a multi-band dynamic phasor electromagnetic transient simulation method and system for a voltage source type converter. Background technique [0002] Voltage source converter (VSC) is widely used in wind turbine grid connection, solar power generation grid connection, medium and low voltage direct current transmission / distribution network, etc. For power systems, electromagnetic transient is the most important system analysis method, but with the application of power electronic equipment in power systems, electromagnetic transient simulation faces the contradiction between simulation speed and simulation accuracy. In the traditional electromagnetic transient simulation, the detailed model of the voltage source converter is generally used, and the precise change of the high-frequency switch can only be captured through the small-step simulation, and the system admittance matri...

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Problems solved by technology

Use the Hilbert transform to construct the analytical signal, shift the frequency with the power frequency as the dominant frequency, and use a large step size simulation after the signal frequency is reduced, but this model limits the signal bandwidth to the vicinity of the power frequency fundamental, and the simulation accuracy is low

[0006] However, none of the above improved models can effectively take into account the accuracy and efficiency of the simulation, and cannot solve the problem of limited simulation scale and simulation speed of the traditional voltage source converter electromagnetic transient model.

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