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CN-121984327-A - Harmonic control system, method and device of variable frequency power supply and storage medium

CN121984327ACN 121984327 ACN121984327 ACN 121984327ACN-121984327-A

Abstract

The invention relates to a harmonic control system, a method, a device and a storage medium of a variable frequency power supply, wherein the harmonic control system of the variable frequency power supply comprises: the system comprises a power module, a main control module, a signal acquisition module and a filtering module, wherein the main control module is connected with the power module, the signal acquisition module is connected with the main control module, the filtering module is connected with the signal acquisition module, and the power module is connected with the filtering module. The cooperative architecture of the main control module, the signal acquisition module, the power module and the filtering module can effectively inhibit higher harmonic interference, is favorable for ensuring stable output voltage and smooth waveform of the variable-frequency power supply, strictly controls the Total Harmonic Distortion (THD) to be within 2 percent, and meets the strict requirements of precise industrial equipment, a power electronic system and the like on the power quality.

Inventors

  • LIU YUFEI
  • ZHOU WU
  • Jiang Tianqiang

Assignees

  • 广东数川科技有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. Harmonic control system of variable frequency power supply, its characterized in that includes: a power module (100); the main control module (200), the said main control module (200) connects with said power module (100); The signal acquisition module (300), the said signal acquisition module (300) is connected with said master control module (200); The filtering module (400) is connected with the signal acquisition module (300), and the power module (100) is connected with the filtering module (400).
  2. 2. The harmonic control system of a variable frequency power supply of claim 1, wherein, The main control module (200) comprises a core processor, a digital power supply module (220), an analog power supply module (230) and a pulse width modulation level conversion module (240), wherein the core processor adopts a digital signal processing microcontroller (210), the harmonic control system of the variable frequency power supply comprises an acquisition circuit (500) and a comprehensive sensor (600), The digital power module (220) is connected with the digital signal processing microcontroller (210), the digital signal processing microcontroller (210) is connected with the pulse width modulation level conversion module (240), the digital power module (220) is connected with the pulse width modulation level conversion module (240), the acquisition circuit (500) is connected with the digital signal processing microcontroller (210), the integrated sensor (600) is connected with the acquisition circuit (500), the analog power module (230) is connected with the acquisition circuit (500), and the analog power module (230) is connected with the integrated sensor (600).
  3. 3. The harmonic control system of a variable frequency power supply of claim 2, wherein, The signal acquisition module (300) comprises a Hall sensor (310), a low-pass filter circuit (320) and an analog-to-digital conversion module (330), wherein the Hall sensor (310) is connected with the low-pass filter circuit (320), the low-pass filter circuit (320) is connected with the analog-to-digital conversion module (330), the analog-to-digital conversion module (330) is connected with the main control module (200), and the analog power module (230) is connected with the Hall sensor (310).
  4. 4. The harmonic control system of a variable frequency power supply of claim 1, wherein, The power module (100) comprises an isolation power supply (110), a power chip (120) and a switching device (130), wherein the isolation power supply (110) is connected with the power chip (120), the power chip (120) is connected with the switching device (130), the switching device (130) is composed of a plurality of switching tubes (Q2), and the power chip (120) is respectively connected with a plurality of switching tubes (Q2).
  5. 5. The harmonic control system of a variable frequency power supply of claim 1, wherein, The filter module (400) comprises a filter (410), an inversion end (Vinv), a load end (420) and an output filter plate (430), wherein the filter (410) is connected with the output filter plate (430), the output filter plate (430) is connected with the load end (420), the load end (420) is connected with the inversion end (Vinv), the filter (410) comprises a transformer (T1) and a first capacitor (C1), the transformer (T1) is connected with the first capacitor (C1), the output filter plate (430) comprises a high-frequency absorption capacitor (C4) and a surge suppression device (Q1), and the high-frequency absorption capacitor (C4) is connected with the surge suppression device (Q1).
  6. 6. A harmonic control method of a variable frequency power supply, applied to the harmonic control system of the variable frequency power supply according to any one of claims 1 to 5, characterized by comprising the steps of: S100, taking a main control module (200) as an instruction sending and data processing core, receiving equipment state signals transmitted by a signal acquisition module (300), and outputting PWM control signals after the equipment state signals are operated by a digital signal processing microcontroller (210) of the main control module (200), wherein the equipment state signals comprise voltage signals and current signals; S200, a control power module (100) receives a main control instruction and performs inversion conversion from direct current bus voltage to SPWM pulse wave; S300, a filter (410) of the filtering module (400) is controlled to primarily filter out higher harmonic waves by utilizing the characteristics of inductance energy storage and capacitance flat wave, an output filtering plate (430) of the filtering module (400) integrates a high-frequency absorption capacitor (C4) and a surge suppression device (Q1) to optimize waveforms, and the output filtering plate (430) is controlled to point to a load output end to form a complete electric energy conversion and harmonic wave control link.
  7. 7. The method of claim 6, wherein the harmonic control system of the variable frequency power supply is operated, The ADC acquisition module is controlled to capture the voltage signal and the current signal, and the voltage signal and the current signal are subjected to digital filtering processing and then the actual output voltage effective value is respectively transmitted to the algorithm module and the sine pulse width modulation module; in the algorithm module, an outer ring controller for controlling an effective value calculates a voltage reference value according to the voltage effective value deviation, and an inner ring controller for controlling harmonic waves is controlled to carry out harmonic compensation by combining the actual output voltage effective value, so that a corrected SPWM (sinusoidal pulse width modulation) amplitude value instruction is generated; And in the sine pulse width modulation module, after the sine pulse width modulation module is controlled to receive the corrected SPWM modulation amplitude value instruction, a unipolar frequency multiplication algorithm is used for generating a sine modulation wave, the sine modulation wave is compared with a triangular carrier of the enhanced pulse width modulation module, and a high-frequency pulse driving signal is output so as to control the power module (100) to perform electric energy inversion.
  8. 8. The method for harmonic control of a variable frequency power supply according to claim 7, wherein, in the algorithm module, Adopting a double closed-loop control structure, wherein the double closed-loop control structure comprises an effective value outer loop controller and a harmonic inner loop controller, and calculating the deviation between a given reference voltage effective value and an actual output voltage effective value through the effective value outer loop controller to generate a current inner loop reference instruction so as to realize steady-state precision adjustment; and controlling the harmonic inner loop controller to provide high gain compensation at a preset harmonic frequency for 3 rd order, 5 th order and 7 th order higher harmonics introduced by a power grid or a load, and inhibiting harmonic components so as to reduce the total harmonic distortion rate of the output voltage.
  9. 9. A computer device comprising a memory and a processor, wherein the processor implements the method of any of claims 6 to 8 when executing a computer program stored in the memory.
  10. 10. A computer readable storage medium having stored thereon program instructions, which when executed by a processor implement the method of any of claims 6 to 8.

Description

Harmonic control system, method and device of variable frequency power supply and storage medium Technical Field The present invention relates to the field of power control technologies, and in particular, to a harmonic control system, a method, an apparatus, and a storage medium for a variable frequency power supply. Background The harmonic problem of the variable frequency power supply system can cause serious influence on the power system and the electric equipment. For electric power system, harmonic wave causes voltage waveform distortion, system power factor reduction, and possible system resonance induction, local overvoltage or overcurrent, and for electric equipment, harmonic wave causes additional heating and torque pulsation of motor, iron loss and copper loss increase, motor efficiency reduction, motor service life reduction, harmonic wave also interferes with normal operation of sensitive electronic devices in occasions of precise instruments, aviation power supply, etc., resulting in measurement error and control failure. As such, harmonic control has become an indispensable key technology in the development and application of variable frequency power supplies. Along with the continuous improvement of the electric energy quality standard of various countries, the GJB 181B standard clearly specifies that the Total Harmonic Distortion (THD) of the voltage of the variable-frequency alternating-current power supply system is required to be less than 5%, and the content of each subharmonic of 6000Hz and below is not required to be higher than 3.16V. In this context, harmonic control techniques of variable frequency power supplies have become a focus of attention in academia and industry. From traditional passive filtering to modern active filtering, from analog control to digital intelligent control, harmonic suppression technology is continuously developing towards high efficiency, accuracy and self-adaption. Disclosure of Invention The invention provides a harmonic control system, a harmonic control method, a harmonic control device and a harmonic control storage medium of a variable frequency power supply, and aims to at least solve one of the technical problems in the prior art. The technical scheme of the invention is a harmonic control system of a variable frequency power supply, which comprises: A power module; The main control module is connected with the power module; The signal acquisition module is connected with the main control module; The filtering module is connected with the signal acquisition module, and the power module is connected with the filtering module. According to some embodiments of the invention, the main control module comprises a core processor, a digital power module, an analog power module and a pulse width modulation level conversion module, wherein the core processor adopts a digital signal processing microcontroller, the harmonic control system of the variable frequency power supply comprises an acquisition circuit and a comprehensive sensor, the digital power module is connected with the digital signal processing microcontroller, the digital signal processing microcontroller is connected with the pulse width modulation level conversion module, the digital power module is connected with the pulse width modulation level conversion module, the acquisition circuit is connected with the digital signal processing microcontroller, the comprehensive sensor is connected with the acquisition circuit, the analog power module is connected with the acquisition circuit, and the analog power module is connected with the comprehensive sensor. According to some embodiments of the invention, the signal acquisition module comprises a hall sensor, a low-pass filter circuit and an analog-to-digital conversion module, wherein the hall sensor is connected with the low-pass filter circuit, the low-pass filter circuit is connected with the analog-to-digital conversion module, the analog-to-digital conversion module is connected with the main control module, and the analog power supply module is connected with the hall sensor. According to some embodiments of the invention, the power module comprises an isolated power supply, a power chip and a switching device, wherein the isolated power supply is connected with the power chip, the power chip is connected with the switching device, the switching device is composed of a plurality of switching tubes, and the power chip is respectively connected with the plurality of switching tubes. According to some embodiments of the invention, the filter module includes a filter, an inverter, a load, and an output filter board, the filter is connected to the output filter board, the output filter board is connected to the load, the load is connected to the inverter, the filter includes a transformer and a first capacitor, the transformer is connected to the first capacitor, the output filter board includes a high frequency absorption capacitor and a sur