Feedforward Compensation Control Algorithm for Instantaneous Active Power Output of Three-phase Inverter Power Supply

Abstract

The present invention provides a feed-forward compensation control algorithm for the instantaneous active power output by the three-phase inverter power supply. The instantaneous value of the mains voltage is used as the input reference of the PFC current loop controller; specifically, the instantaneous active power is divided into three equal parts and used as the input feedforward reference of the PFC current loop controller in the three phases. A three-phase inverter power supply inverter output instantaneous active power feedforward compensation control algorithm proposed by the present invention, by referring to the PFC current loop controller and adding the inverter output power feedforward control algorithm, to ensure the three-phase inverter power supply with Transient performance of DC bus voltage under load. The algorithm adds feed-forward compensation of instantaneous active power of the inverter output to the PFC controller to ensure the performance of the DC bus voltage in the transient state and reduce the distortion rate of the inverter output voltage of the three-phase inverter power supply when it is loaded and unloaded instantaneously. .

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to the field of control optimization of three-phase inverter power supply. Background technique [0002] For the three-phase inverter power supply, in order to improve the power factor and reduce the grid current harmonics, the front stage generally adds a PFC rectification link. If the load is applied instantaneously, the DC bus voltage will drop instantaneously. If the DC bus voltage drop value is close to the peak value of the mains, the output voltage of the three-phase inverter power supply will be clipped, which will cause serious distortion of the inverter voltage. The drop amplitude of the DC bus voltage is not only related to the capacitance of the DC bus capacitor in the three-phase inverter power supply and the load condition of the inverter, but also closely related to the bandwidth of the PFC voltage loop controller in the three-phase inverter power supply. . The ...

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Problems solved by technology

The wider the bandwidth of the PFC voltage loop controller, the better the transient characteristics of the DC bus voltage under load, but the worse the THD (harmonic distortion) of the input current

Therefore, technicians need to consider compromises when designing the bandwidth of the PFC voltage loop controller, which will lead to deterioration of the steady-state performance of the PFC control and make it more difficult to achieve the optimal dynamic performance.

[0003] In addition, in order to prevent serious distortion of the inverter output voltage due to the drop of the DC bus voltage during loading, the setting value of the DC bus voltage is often set to a larger range than the peak value of the mains power, but this method often leads to The low efficiency of the front-stage PFC and the increased stress of the rear-stage inverter switching tubes reduce the efficiency and reliability of the inverter power supply

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