Single-phase inverter finite time control method based on disturbance observer

A technology of single-phase inverter and disturbance observer, which is applied in the finite-time control of single-phase inverter based on output feedback and finite-time disturbance observer, and in the field of finite-time control of single-phase inverter, which can solve the problem of increasing system cost , unable to meet the system fast tracking and high fault tolerance requirements, etc., to achieve the effect of accurate estimation

Active Publication Date: 2017-09-22
SOUTHEAST UNIV
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Problems solved by technology

However, this method requires both voltage and current measurement information, and can only achieve asymptotic convergence, which increases the cost of the system to a certain extent, and cannot meet the requirements of fast tracking and high fault tolerance of the system.

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  • Single-phase inverter finite time control method based on disturbance observer
  • Single-phase inverter finite time control method based on disturbance observer
  • Single-phase inverter finite time control method based on disturbance observer

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Embodiment Construction

[0056] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0057] Figure 1(a) is a block diagram of the basic control circuit of a single-phase inverter, where v o is the capacitor voltage, that is, the output voltage, v ref is the reference value of the output voltage, i L is the inductor current, C, R, L and V dc Respectively represent the filter capacitor, load resistance, filter inductance and input DC voltage source in the single-phase inverter circuit, u is the output signal of the controller, and t is time. Figure 1(b) shows the platform structure where the single-phase inverter is located. Use the voltage sensor to collect and measure the output voltage signal of the system, input it to the A / D acquisition por...

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Abstract

The invention discloses a single-phase inverter finite time control method based on a disturbance observer. The method comprises steps: a disturbed state space average model for the single-phase inverter is built; with the tracking error value between the voltage actually outputted by the inverter and reference voltage as a state variable, influences of lumped disturbance are also considered, an error dynamic model for the single-phase inverter is built, and a finite time disturbance observer is designed; output of the observer serves as feedforward compensation and is combined with an output feedback control method, a finite time anti-disturbance controller based on the finite time disturbance observer is designed; and according to the finite time anti-disturbance controller, control on the output voltage of the single-phase inverter is realized. thus, quick and accurate tracking on the reference output voltage of the single-phase inverter in a finite time and accurate compensation suppression on multisource disturbance and uncertainty can be realized, the anti-disturbance ability of the system is improved, the system cost is reduced, and the fault-tolerance performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and relates to a finite-time control method for a single-phase inverter, and more specifically, relates to a finite-time control method for a single-phase inverter based on output feedback and a finite-time disturbance observer . Background technique [0002] In recent years, single-phase inverters have been widely used in industrial fields such as uninterruptible power supplies, variable frequency power supplies, AC motor drive systems, grid reactive power compensators, wind power and photovoltaic power generation technologies, in order to reduce system costs and improve system fault tolerance Capability, non-current sensing technology has also become a research hotspot. [0003] As we all know, the control effect of single-phase inverter is very susceptible to various multi-source disturbances and uncertainties. Single-phase inverter systems are often subject to various fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0012
Inventor 李世华戴忱王佐杨俊
Owner SOUTHEAST UNIV
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