Instantaneous current direct tracking control method for I-type three-level grid-connected converter
A technology of instantaneous current and tracking control, applied in the direction of converting AC power input to DC power output, electrical components, single-network parallel feeding arrangement, etc. network converter problems
Active Publication Date: 2018-11-23
SHANDONG JIANZHU UNIV +1
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Chinese patent 201110281870.7 proposes an instant current direct control implementation method for the active power filter with two-level main circuit topology, which has the characteristics of less data calculation, high pulse width utilization rate, and good tracking control effect, but this method is not applicable Three-level grid-connected converter
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[0080] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0081] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0082] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...
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The invention discloses an instantaneous current direct tracking control method for an I-type three-level grid-connected converter. The method comprises the following steps: real-time sampling a capacitor terminal voltage of a converter DC side, a voltage instantaneous value of each phase of grid and an actual output instantaneous current of the converter in each control cycle; analyzing differentworking states of the three-level grid-connected converter, and calculating an output current change amount and an instantaneous current displacement scale factor under each effective working state;according to voltage direction of each phase of grid, selecting the effective instantaneous current displacement scale factor in each control cycle according to the phase; calculating action time of each effective instantaneous current displacement scale factor and PWM control pulse width of each switching tube by using desired values, actual values of the phases and selected effective instantaneous current displacement scale factors, realizing direct control of output instantaneous current of the converter through pulse width modulation.
Description
technical field [0001] The invention relates to the technical field of output current tracking control of grid-connected power electronic converter equipment, in particular to a direct tracking control method for output instantaneous current of a grid-connected converter device with an I-type three-level main circuit topology. Background technique [0002] Various grid-connected power electronic converter devices such as active power filter (APF), static var generator (SVG), photovoltaic / wind power generation, bidirectional converter for energy storage, PWM rectifier, etc. Connected to the grid through a series reactor, this type of device mainly realizes its specific functional requirements by precisely and quickly controlling its output current under the support of the mains voltage. Therefore, this type of device mainly includes output current command generation technology and output current tracking control technology in terms of measurement and control. [0003] In the...
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IPC IPC(8): H02M7/483H02J3/38
Inventor 尹春杰尹俐王鑫丁绪东段培永王芳朱孟隆吴边
Owner SHANDONG JIANZHU UNIV