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Dual-carrier svpwm control method for suppressing the circulation of energy feedback device

A technology of energy feedback and control method, which is applied in the field of power electronics, can solve problems such as forming circulating currents, reducing system efficiency, increasing the volume and cost of energy feedback devices, etc., to improve efficiency and stability, reduce output current distortion, reduce The effect of pulse current

Active Publication Date: 2019-04-16
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the energy feedback device and the rectifier bridge of the inverter are in parallel topology, if the traditional single-carrier SVPWM switching modulation mode is adopted, the theoretical analysis shows that since there are two zero vectors in the switch state, the energy feedback device During operation, pulse current will be generated on the input side of the inverter, which will cause a circulation problem, reduce system efficiency, and also affect the grid-connected current quality of the energy feedback device
Although the output filter with large inductance can suppress the circulating current, it will inevitably increase the size and cost of the energy feedback device
Therefore, adopting the traditional SVPWM control strategy will not be conducive to the efficient and stable operation of the energy feedback device

Method used

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  • Dual-carrier svpwm control method for suppressing the circulation of energy feedback device

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Embodiment

[0062] The system design of the inverter energy feedback device is: the energy feedback system is replaced by a three-phase voltage PWM rectifier connected in parallel with a diode rectifier bridge, the AC side is connected to a 220V three-phase AC power grid, and the DC side uses a 700V constant voltage DC source to simulate motor regeneration. The DC bus voltage U of the frequency converter when running dc , voltage control loop command voltage The setting is 680V, ​​the switching frequency is 10kHz, the output inductance of the AC side is 2.4mH, and the dead time is 1us.

[0063] In order to verify that the circulating current of the energy feedback device adopts the dual-carrier SVPWM modulation mode is smaller than that of the traditional single-carrier SVPWM modulation mode, under the condition that all system parameters are consistent, MATLAB simulation is used to compare the circulating current under the two modulation modes:

[0064] image 3 Shown is the three-pha...

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Abstract

The invention discloses a dual-carrier SVPWM control method for inhibiting the circulation of an energy feedback device. The dual-carrier SVPWM control method comprises the following steps: segmenting, calculating and judging sectors, calculating a voltage vector acting time, calculating a voltage vector switching time, performing three-phase carrier judgment and generating PWM waves. According to the dual-carrier SVPWM control method disclosed by the invention, the energy feedback device collaboratively used by a general purpose converter is controlled by using the SVPWM control technology, a new dual-carrier space vector modulation technology is applied to the control strategy of the energy feedback device, the circulation during the parallel operation of the energy feedback device and a rectifier bridge of the converter can be effectively reduced, the output current waveform distortion is reduced, and the efficiency and the stability of the whole system are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a SVPWM control method of a frequency converter energy feedback device. Background technique [0002] The inverter energy feedback device is a special grid-connected inverter. Its DC input side is connected to the DC bus of the inverter, and its AC output side is connected to the input side of the inverter, and is connected to the three-phase grid. When the motor driven by the inverter works in the regenerative braking state, the regenerative braking energy of the motor enters the DC bus of the inverter, causing the DC side voltage of the inverter to rise. When the voltage reaches a certain set value, By controlling the turn-on and turn-off of the six power devices of the energy feedback device, the energy on the DC bus is fed back to the power grid to realize the recycling of electric energy and achieve the purpose of energy saving. [0003] SVPWM is a control method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395H02P27/12H02P27/08
CPCH02M7/5395H02P27/085H02P27/12
Inventor 吕广强顾星顾伟耿严岩杨鑫
Owner NANJING UNIV OF SCI & TECH
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