Method of controlling three-phase PWM inverter based on second-order sliding mode and disturbance observer

A disturbance observer and second-order sliding mode technology, which is applied in the direction of irreversible DC power input to AC power output, output power conversion device, AC power input converted to DC power output, etc.

Active Publication Date: 2015-03-04
SOUTHEAST UNIV
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Problems solved by technology

[0006] However, the inherent discontinuous switching characteristics of the sliding mode variable structure control will cause chattering problems in the system
Traditional sliding mode control often requires a large switching gain to el...

Method used

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  • Method of controlling three-phase PWM inverter based on second-order sliding mode and disturbance observer
  • Method of controlling three-phase PWM inverter based on second-order sliding mode and disturbance observer
  • Method of controlling three-phase PWM inverter based on second-order sliding mode and disturbance observer

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Embodiment Construction

[0036] Control block diagram according to the present invention figure 2 , using the sensor to measure the three-phase capacitor voltage and three-phase inductor current at the output of the inverter, through the line voltage (current) and phase voltage (current) transformation (Line to phase), 3 / 2 coordinate transformation to obtain two subsystem models, and then Reconstruct the state, design a disturbance observer (DO) to estimate the disturbance, use the obtained disturbance estimate and the constructed state to design a second-order sliding mode controller (SOSMC), and obtain the sliding mode control law after 2 / 3 coordinate transformation The PWM signal is generated by SPWM modulation to control the turn-on and turn-off of the switch tube of the inverter. Specific steps are as follows:

[0037] Step 1: Three-phase PWM inverter system such as figure 1 , modeling the three-phase PWM inverter system can be obtained where x=(v ab v bc v ca i A i B i C ) T is ...

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Abstract

The invention discloses a method of controlling a three-phase PWM (Pulse Width Modulation) inverter based on a second-order sliding mode and a disturbance observer. The method is applicable to the high-performance control of the three-phase AC (alternating current) inverter and comprises the steps: firstly, decoupling a three-phase AC inverter system into two single-phase second-order sub-systems in the use of 3/2 coordinate transformation; secondly, designing the two second-order sub-systems on this basis and designing the disturbance observer to observe matched and non-matched disturbances under the condition of considering the load transformation of the system; and thirdly, designing the compound control method of the second-order sliding mode and the disturbance controller on the basis of acquiring disturbance estimation values so as to improve the anti-load-disturbance ability of the system. The method is simple to realize and has less regulation of parameters; the voltage output harmonic waves of the three-phase AC inverter system can be reduced effectively, so that the purpose of improving stability precision of the AC inverter system is achieved and the application of the high-performance AC inverter system in the voltage output field is satisfied.

Description

technical field [0001] The invention relates to a three-phase power electronic inverter control technology, in particular to a three-phase PWM inverter control method based on second-order sliding mode control and a disturbance observer. Background technique [0002] With the increasingly prominent environmental problems and the gradual depletion of fossil energy, new energy power generation has received more and more attention. As the main interface device, the inverter brings the most important power quality problem is harmonic pollution. Low-performance inverters will threaten the safety of load equipment and affect the use of electric energy on the user side. Controlling the inverter to reduce harmonic pollution through advanced control algorithms plays an important role in improving power quality and maintaining grid stability. [0003] To this end, a variety of control methods have been proposed: PID control, linear feedback control, repetitive control, resonance con...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M1/12
CPCH02M1/12H02M7/53871
Inventor 李世华郑雯王军晓王佐李奇
Owner SOUTHEAST UNIV
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