Current control method for three-phase voltage source type PWM rectifier

A three-phase voltage and current control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of unstable rectifier operation, inability to guarantee controllers, and reducing the number of sensors. , to achieve good robust stability, no reduction of filtering effect, and good control effect.

CN103780107AActive Publication Date: 2014-05-07INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-05-07

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Abstract

The invention discloses a current control method for a three-phase voltage source type PWM rectifier. The current control method comprises the steps that in a static coordinate system, a dual-closed-loop vector control strategy is adopted, an alternating-current given value of the rectifier is calculated to be obtained by collecting an alternating-current side voltage, an alternating-current side current and a direct-current voltage of the rectifier, the alternating-current given value and an actual value are compared, calculated and fed into an H-infinity current regulator, an output signal of the H-infinity current regulator and a network voltage feed forward signal are added to obtain a bridge terminal voltage reference signal of the rectifier, and then a switch control signal of the rectifier is generated through PWM and used for controlling an IGBT to be switched on or off so as to achieve the electric energy conversion function. According to the current control method for the three-phase voltage source type PWM rectifier, the H-infinity current regulator is designed to be transformed to solve the H-infinity standard problem by establishing a mathematic model of the rectifier and the filter of the rectifier; due to the influence of the problems of rectifier parameter uncertainty, inherent LC oscillation and the like, a reasonable weight function is constructed to conduct optimal design on the H-infinity current regulator, the output current of the three-phase voltage source type PWM rectifier is regulated through the H-infinity current regulator, and the direct voltage and the output power of the rectifier are controlled.
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Description

technical field

[0001] The invention relates to a control method of an active rectification / inversion converter, in particular to a current control method of a three-phase voltage source PWM rectifier with an inductance-capacitance-inductance (LCL) filter. Background technique

[0002] At present, power electronic rectifiers based on fully controlled switching devices and pulse width modulation (PWM) technology have been widely used, and the system capacity is still increasing. Its application fields include uninterruptible power supply (UPS), active power filter (APF), static synchronous var compensator (STATCOM), dynamic voltage restorer (DVR), flexible high-voltage direct current transmission (VSC-HVDC), etc., these Basic prototypes of equipment often employ voltage source rectifiers.

[0003] The control of the three-phase rectifier generally adopts double-closed-loop vector control. Using coordinate transformation technology, in a synchronous rotating coordinate syste...

Examples

Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention provides a current control method for a three-phase voltage source type PWM rectifier, which adopts a double-closed-loop vector control strategy in a static coordinate system. The design problem of the inner loop H∞ current regulator is transformed into solving an H∞ optimal problem, that is, firstly design a reasonable control object and weight function model, and then use the H∞ problem iterative algorithm to solve the required parameterized H ∞ Current Regulator.

[0032] figure 1 It is a vector control schematic diagram of a three-phase voltage source rectifier of the present invention, which includes a rectifier bridge 1, an LCL filter 2, a DC bus capacitor 3, a DC voltage sensor 4, a three-phase AC current sensor 5, a three-phase AC voltage sensor 6, Three-phase / two-phase static coordinate transformation mod...