Parallel resonance suppression method based on active damping linear active disturbance rejection control
A linear active disturbance rejection and resonance suppression technology, applied in harmonic reduction devices, output power conversion devices, reduction/prevention of power oscillations, etc. inhibiting effect
Inactive Publication Date: 2021-08-24
TAIYUAN UNIV OF TECH
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[0003] Aiming at the parallel resonance problem caused by the difference of software and hardware parameters, the number of parallel inverters and the perturbation of line impedance in the parallel grid-connected inverter system, the present invention designs a parallel resonance suppression method based on active damping linear active disturbance rejection control
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[0018] Parallel resonance suppression method based on active damping linear active disturbance rejection control, including three-phase three-leg converter (grid-connected inverter), AC side of three-phase three-leg converter through filter inductor 1, filter capacitor and the filter inductor 2 are connected to the AC power grid, and the DC side is connected to the distributed power generation system through the DC capacitor. It also includes an AC voltage acquisition module for acquiring AC voltage measurement, an AC current acquisition module for acquiring AC measurement current, and a capacitive current acquisition module for acquiring filter capacitor current. The output end of the AC voltage acquisition module is connected to the input end of the phase-locked loop, the output end of the phase-locked loop is respectively connected to the coordinate transformation module and the inverse coordinate transformation module, the output end of the AC current acquisition module and...
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The invention provides a parallel resonance suppression method based on active damping linear active disturbance rejection control. A current inner loop controller based on third-order linear active disturbance rejection control is designed, multi-dimensional coupling generated by the number of parallel units, power grid impedance, parameter perturbation and the like in a parallel grid-connected inverter system is classified into total disturbance of the system and compensated, the offset of an offset resonance point is reduced, and the coupling degree of the parallel grid-connected inverter system is reduced. On the basis, an active damping control scheme based on capacitive current feedback is adopted, the resonance peak of the parallel grid-connected inverter is suppressed, and overvoltage, overcurrent and other conditions are reduced. According to the parallel resonance suppression method based on active damping linear active disturbance rejection control, the coupling degree between parallel grid-connected inverters can be effectively reduced, the resonance induction risk of a parallel grid-connected inverter system is suppressed, and the operation stability and safety of the parallel grid-connected inverter system are improved.
Description
technical field [0001] The invention relates to the field of grid-connected inverters, in particular to a parallel resonance suppression method based on active damping linear active disturbance rejection control. Background technique [0002] As one of the core links of grid-connected distributed generation systems, grid-connected inverters must provide voltage and frequency support while ensuring energy transmission. However, with the increasing penetration rate of distributed power generation systems and the continuous development of power electronics technology, it is difficult for a single grid-connected inverter to meet the actual engineering needs. Therefore, the redundant design of parallel grid-connected inverters has greatly improved In order to improve the power transfer capability and operational stability, it has received more and more attention. However, the safe and stable operation of the parallel grid-connected inverter system is affected by the parameters o...
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IPC IPC(8): H02J3/01H02J3/24H02J3/38H02M7/5395H02M7/5387
CPCH02J3/01H02J3/241H02J3/38H02M7/5395H02M7/53871Y02E40/40
Inventor 张佰富韩肖清赵震张一王磊杨玉岗任春光孔建生
Owner TAIYUAN UNIV OF TECH