GSSA-based buck-type power converter dynamic model analysis method

A dynamic model and analysis method technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problems of undiscovered patent documents, etc.

Inactive Publication Date: 2018-09-11
STATE GRID TIANJIN ELECTRIC POWER +1
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  • GSSA-based buck-type power converter dynamic model analysis method
  • GSSA-based buck-type power converter dynamic model analysis method
  • GSSA-based buck-type power converter dynamic model analysis method

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[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0036] A GSSA-based buck type power converter dynamic model analysis method, comprising the following steps:

[0037] (1) Establish a power converter system, which includes: a three-phase balanced voltage source, the equivalent parameter is R eq , L eq and C eq The transmission line, three-phase 6-pulse controllable rectifier, consists of L dc 、C dc and the respective equivalent series impedance r L 、r C Composed of DC filter and IGBT-controlled buck-type step-down chopper link;

[0038] Define the trigger conduction angle of the thyristor as α, and the corresponding switching function of the power device is S a , using the Fourier series, the switching function S of the three-phase 6-pulse co...

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Abstract

The invention relates to a GSSA-based buck-type power converter dynamic model analysis method, comprising the following steps: (1) establishing a power converter system which comprises a three-phase balanced voltage source, a transmission line with the equivalent parameters of Req, Leq and Ceq, a three-phase 6-pulse controllable rectifier, a DC filter consisting of Ldc, Cdc and their respective equivalent series impedance rL, rC, and a buck-type step-down chopping link controlled by an IGBT; (2) using the DQ transformation theory to analyze the three-phase rectification link, using the GSSA method to respectively analyze the buck-type step-down chopping link, and establishing the model parameters of the power converter system; and (3) combining the thyristor and the IGBT chopping link under control of different trigger angles and duty ratios to analyze the response condition of the power converter system during the voltage fluctuation of the power supply, further proving the performance of the DQ and GSSA hybrid control model, and then according to the performance, selectively applying the model to electric vehicle charging stations, metal thermal processing, wind farm converter stations and inverter driving.

Description

technical field [0001] The invention belongs to the field of power system control and relates to frequency converters, in particular to a GSSA-based buck type power converter dynamic model analysis method. Background technique [0002] Power converters are widely used in various occasions, such as electric vehicle charging stations, metal thermal processing, wind farm converter stations, and frequency converter drives. It is well known that power converter models are usually time-varying due to the behavior of switching devices, and classical linear control theory is often used to analyze and design such models. The first common method is Generalized State-Space Averaging (GSSA). This method is mainly used to analyze various power converters in DC distribution systems, controllable and uncontrollable rectifiers in single-phase AC distribution systems, and 6-pulse and 12-pulse diode rectifiers in three-phase systems. The second is the average value model method, which is ma...

Claims

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor 朱辉黄潇潇陶宇航何岩岩付剑雄张庆堃吴树茂
Owner STATE GRID TIANJIN ELECTRIC POWER
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