Z-source inverter grid-connected control device based on active disturbance rejection and proportional resonant control

Abstract

The invention discloses a Z-source inverter grid-connected control device based on active disturbance rejection and proportional resonant control. The inverter comprises a Z-source inverter impedor, aZ-source inverter bridge, an LCL filter module, a voltage sampling circuit and a phase-locked loop module which are connected in sequence, wherein the output end of the phase-locked loop module is connected to a cosine module, the output end of the cosine module is connected to a control circuit, and the control circuit comprises a multiplier module, an active disturbance rejection control module, a proportional resonant control module, a PWM pulse modulator and a pulse driving module, the multiplier module receives a signal of the cosine module and a current signal set value, the output endsof the active disturbance rejection control module and the proportional resonant control module are connected to the pulse driving module through a PWM pulse modulator, and the output end of the pulse driving module is connected to the Z-source inverter bridge to control the on and off of a field-effect tube in the Z-source inverter bridge. The Z-source inverter grid-connected control device canimprove the static stability of the inverter while improving the dynamic characteristics of the inverter.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected control, and in particular relates to a photovoltaic grid-connected control device for a Z-source inverter with active disturbance rejection and proportional resonance control. Background technique [0002] With the development of information technology, the country has increasingly strict requirements on the quality of grid-connected power. Improving the inverter performance of grid-connected inverters is an effective technical means to improve the quality of grid-connected power. The key to improving the inverter performance of the grid-connected inverter is to continuously optimize the control strategy. The control strategies currently applied to the inverter mainly include the voltage-current double-loop control method, the classic PID control method, the active disturbance rejection control method (ADRC), and the proportional resonance Control method (PR), repeated control...

AI Technical Summary

Problems solved by technology

The key to improving the inverter performance of the grid-connected inverter is to continuously optimize the control strategy. The control strategies currently applied to the inverter mainly include the voltage-current double-loop control method, the classic PID control method, the active disturbance rejection control method (ADRC), and the proportional resonance Control method (PR), repeated control method, although these single control methods have been developed relatively mature, but the single control method still cannot meet the actual needs, which requires the combination of different control strategies to achieve the purpose of optimal control

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