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Design method of controller parameters and feedback damping coefficient of three-phase current source type grid-connected inverter digital control system

A digital control system, three-phase current technology, applied in electrical digital data processing, AC network to reduce harmonics/ripples, instruments, etc., can solve the problems of complex control system analysis and parameter design

Active Publication Date: 2019-11-15
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Purpose of the invention: In the three-phase current source type grid-connected inverter system based on capacitor voltage feedback active damping, the problem of complex control system analysis and parameter design due to high-pass filter and digital control delay in the capacitor feedback path, the present invention A design method for the controller parameters and feedback damping coefficient of a three-phase current source type grid-connected inverter digital control system is proposed

Method used

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  • Design method of controller parameters and feedback damping coefficient of three-phase current source type grid-connected inverter digital control system
  • Design method of controller parameters and feedback damping coefficient of three-phase current source type grid-connected inverter digital control system
  • Design method of controller parameters and feedback damping coefficient of three-phase current source type grid-connected inverter digital control system

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Embodiment 1

[0091] refer to figure 1 , this embodiment provides a method for designing controller parameters and feedback damping coefficients of a three-phase current source type grid-connected inverter digital control system, which specifically includes the following steps:

[0092] Step S1: Reference figure 2 , through the open-loop transfer function of the three-phase CSI capacitor voltage feedback active damping control system, the range of the corresponding damping coefficient can be determined when the digital control system of the three-phase current source type grid-connected inverter is in closed-loop stability, details as follows:

[0093] Step S1.1: Establish the open-loop transfer function of the three-phase CSI capacitive voltage feedback active damping control system in the z domain, specifically:

[0094]

[0095] Among them: T o (z) is the z-domain open-loop transfer function, G PR (z) is the approximate z-transform of the PR controller, ω r is the resonant angular...

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Abstract

The invention discloses a design method of controller parameters and feedback damping coefficient of a three-phase current source type grid-connected inverter digital control system. The method comprises steps that S1, a value range of the damping coefficient is determined through an open-loop transfer function of a control system; S2, the resonance frequency of a CL filter is obtained according to the fundamental frequency and the switching frequency; S3, in combination with dynamic performance of the three-phase current source type grid-connected inverter digital control system, a feedback damping coefficient is determined; and S4, controller parameters are obtained under the conditions that the three-phase current source type grid-connected inverter digital control system is stable. Themethod is advantaged in that by analyzing the stability of the control system under the discrete domain, in combination with the system delay and the influence of a high-pass filter on a capacitor voltage feedback path, not only can the resonance of the CL filter be effectively suppressed, but also dynamic performance and steady-state performance of the system can be further guaranteed.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a method for designing controller parameters and feedback damping coefficients of a digital control system of a three-phase current source type grid-connected inverter. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, wind energy, solar energy and other renewable energy power generation technologies have been developed rapidly. As the interface between renewable energy and the grid, the grid-connected inverter has great research value. According to the different forms of energy storage on the DC side, grid-connected inverters are divided into voltage-source inverters (VSI) and current-source inverters (CSI). Compared with VSI, CSI has the advantages of boost characteristics, reliable short-circuit protection characteristics, simple direct current control characteristics, etc., so it has been widely used in new...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38G06F17/50
CPCH02J3/01Y02E40/40
Inventor 耿乙文宋宣锋张旭杨可刘海卫朱运
Owner CHINA UNIV OF MINING & TECH
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