Multi-band dynamic phasor electromagnetic transient simulation method and system for voltage source type converter

Abstract

The invention discloses a multi-band dynamic phasor electromagnetic transient simulation method and system for a voltage source type converter, and relates to the field of power system analysis, and the method mainly comprises the steps: obtaining an electrical signal of the voltage source type converter; establishing a switching function of each switching device according to the direct-current side voltage signal and the alternating-current side voltage signal of each switching device; establishing a voltage source type converter model according to the switching function of each switching device, the power grid alternating current side three-phase voltage signal, the power grid alternating current side three-phase current signal and the direct current side voltage signal; processing the voltage source type converter model by adopting a multi-band dynamic phasor method, and establishing a multi-band dynamic phasor electromagnetic transient simulation model of the voltage source type converter; and performing large-step simulation on the multi-band dynamic phasor electromagnetic transient simulation model of the voltage source type converter to obtain a simulation result. Accordingto the multi-band dynamic phasor electromagnetic transient simulation method and system for the voltage source type converter, the simulation precision and efficiency can be effectively considered.

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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