CN-121984310-A - Power conversion unit, power conversion method, and shore-based power supply device

CN121984310ACN 121984310 ACN121984310 ACN 121984310ACN-121984310-A

Abstract

The invention discloses a power conversion unit, a power conversion method and shore-based power supply equipment, which relate to the technical field of sea cable fault positioning and comprise a direct current conversion circuit, a resonance transformation circuit, a rectification filter circuit, a driving circuit and a controller, wherein the direct current conversion circuit, the resonance transformation circuit and the rectification filter circuit are connected, the driving circuit is connected with the controller, the direct current conversion circuit and the resonance transformation circuit, the controller is configured to generate PWM signals according to sea cable power supply instructions when sea cable power supply is carried out, output the generated PWM signals to the driving circuit so as to drive the direct current conversion circuit and the resonance transformation circuit, enable the rectification filter circuit to output direct current to sea cables, generate SPWM signals according to sea cable detection instructions when sea cable fault positioning detection is carried out, output the generated SPWM signals and the PWM signals to the driving circuit after superposition, and enable the rectification filter circuit to output alternating current with preset parameters at the same time. The invention reduces the power-off maintenance time of the submarine cable and reduces the economic loss.

Inventors

LI LIBO
CHEN YANLI
SUN JIAN
ZHU YU
MEI CHUANZHI
DING HENGJUN
WANG YINGYAO
LIAO JIANFEI
WANG HAOXIANG

Assignees

烽火海洋网络设备有限公司
烽火通信科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260121

Claims (10)

1. The power conversion unit is characterized by comprising a direct current conversion circuit, a resonance transformation circuit, a rectification filter circuit, a driving circuit and a controller; the direct current conversion circuit, the resonance transformation circuit, the rectification filter circuit connects gradually, the input of direct current conversion circuit connects the power, the sea cable is connected to rectification filter circuit's output, drive circuit with the controller direct current conversion circuit with resonance transformation circuit connects, the controller is configured to: When sea cable power supply is performed, generating a PWM signal according to a sea cable power supply instruction, outputting the generated PWM signal to the driving circuit to drive the direct current conversion circuit and the resonance transformation circuit, and enabling the rectification filter circuit to output direct current to the sea cable; When sea cable fault location detection is carried out, generating an SPWM signal according to a sea cable detection instruction, and outputting the generated SPWM signal and the PWM signal to the driving circuit after superposition, so that the rectifying and filtering circuit outputs direct current and simultaneously superimposes and outputs alternating current with preset parameters.
2. The power conversion unit of claim 1, further comprising: The first detection circuit is connected with the input end of the direct current conversion circuit and the controller, the second detection circuit is connected with the output end of the rectifying and filtering circuit and the controller, and the controller is used for adjusting the generated PWM signal and SPWM signal according to the voltage and current detected by the first detection circuit and the second detection circuit.
3. The power conversion unit of claim 1, wherein: The direct current conversion circuit comprises a first transistor, a first inductor, a first capacitor and a first diode; The first end of the first transistor is connected with the negative electrode of the power supply, the second end of the first transistor is connected with the negative electrode of the first diode, the third end of the first transistor is connected with the driving circuit, the first end of the first inductor is connected with the positive electrode of the power supply, the second end of the first inductor is connected with the negative electrode of the first diode, the first end of the first capacitor is connected with the first end of the first inductor, the second end of the first capacitor is connected with the second end of the first inductor, the positive electrode of the first diode is connected with the second end of the first capacitor, and the first end and the second end of the first capacitor are connected with the resonant transformer circuit.
4. The power conversion unit of claim 3, wherein the first transistor is a MOS transistor.
5. The power conversion unit according to claim 3, wherein the resonant transformation circuit comprises a second transistor, a third transistor, a second inductor, a third inductor, a second capacitor, and a transformer; The first end of the second transistor is connected with the positive electrode of the power supply, the second end of the second transistor is connected with the first end of the third transistor, and the second end of the third transistor is connected with the second end of the second capacitor; The first end of the second inductor is connected with the second end of the second transistor, the first end of the second inductor is connected with the first end of the third inductor and the first end of the primary coil of the transformer, the second end of the third inductor is connected with the first end of the second transistor and the second end of the primary coil of the transformer, the first end of the second capacitor is connected with the first end of the second transistor, and the second end of the second capacitor is connected with the second end of the third transistor; the third terminal of the second transistor and the third terminal of the third transistor are connected to the driving circuit.
6. The power conversion unit according to claim 5, wherein the rectifying and filtering circuit comprises a second diode, a third diode, a fourth diode, a fifth diode, and a third capacitor; The positive pole of the second diode is connected with the first end of the secondary coil of the transformer and the negative pole of the fourth diode, the positive pole of the third diode is connected with the second end of the secondary coil of the transformer and the negative pole of the fifth diode, the negative pole of the second diode is connected with the negative pole of the third diode and the sea cable, the positive pole of the fourth diode is connected with the positive pole of the fifth diode and the sea cable, the first end of the third capacitor is connected with the negative pole of the second diode, and the second end of the third capacitor is connected with the positive pole of the fourth diode.
7. The power conversion unit of claim 1, further comprising: and the follow current circuit is arranged on the rectifying and filtering circuit and is connected with the submarine cable.
8. The power conversion unit of claim 1, wherein: the driving circuit comprises a first driving unit and a second driving unit, and the controller comprises a first control unit and a second control unit.
9. A power conversion method using the power conversion unit of claim 1, comprising the steps of: When the submarine cable is powered, generating a PWM signal according to a submarine cable power supply instruction, outputting the generated PWM signal to a driving circuit to drive a direct current conversion circuit and a resonance voltage transformation circuit, and enabling a rectification filter circuit to output direct current to the submarine cable; When sea cable fault location detection is carried out, generating an SPWM signal according to a sea cable detection instruction, and outputting the generated SPWM signal and the PWM signal to a driving circuit after superposition, so that the rectifying and filtering circuit outputs direct current and simultaneously superimposes and outputs alternating current with preset parameters.
10. A shore-based power supply device comprising a plurality of power conversion units according to claim 1.

Description

Power conversion unit, power conversion method, and shore-based power supply device Technical Field The invention relates to the technical field of submarine cable fault positioning, in particular to a power conversion unit, a power conversion method and shore-based power supply equipment. Background Currently, submarine cable communication systems serve as the core infrastructure of modern global communication networks, and bear more than 95% of international data transmission. However, earthquakes, ship anchors, or other special conditions are extremely prone to damage to sea cables, and efficient fault location detection techniques are needed to achieve rapid repair. The current fault positioning process is that a shore-based power supply equipment PFE judges the approximate position of a submarine cable fault through electric data calculation, after the submarine cable ship reaches a preset position, the shore-based power supply equipment PFE is powered down, a submarine cable terminal box CTB is opened, low-frequency alternating current is injected into the submarine cable at the submarine cable terminal box CTB by using external alternating current generating equipment, the submarine cable ship detects the signal to confirm the damaged specific position of the submarine cable, and then power-off maintenance is carried out. However, the shore-based power supply equipment PFE is powered down in the submarine cable fault positioning detection stage, so that the whole submarine cable overhauling and power-off time is long, and the economic loss is large. Disclosure of Invention The embodiment of the invention provides a power conversion unit, a power conversion method and shore-based power supply equipment, which are used for solving the technical problems that the power failure time of a submarine cable is too long and the economic loss is large when the fault location detection is carried out on the submarine cable in the prior art. In a first aspect, a power conversion unit is provided, including a DC conversion circuit, a resonant transformation circuit, a rectifying filter circuit, a driving circuit, and a controller; the direct current conversion circuit, the resonance transformation circuit, the rectification filter circuit connects gradually, the input of direct current conversion circuit connects the power, the sea cable is connected to rectification filter circuit's output, drive circuit with the controller direct current conversion circuit with resonance transformation circuit connects, the controller is configured to: When sea cable power supply is performed, generating a PWM signal according to a sea cable power supply instruction, outputting the generated PWM signal to the driving circuit to drive the direct current conversion circuit and the resonance transformation circuit, and enabling the rectification filter circuit to output direct current to the sea cable; When sea cable fault location detection is carried out, generating an SPWM signal according to a sea cable detection instruction, and outputting the generated SPWM signal and the PWM signal to the driving circuit after superposition, so that the rectifying and filtering circuit outputs direct current and simultaneously superimposes and outputs alternating current with preset parameters. In some embodiments, the power conversion unit further comprises: The first detection circuit is connected with the input end of the direct current conversion circuit and the controller, the second detection circuit is connected with the output end of the rectifying and filtering circuit and the controller, and the controller is used for adjusting the generated PWM signal and SPWM signal according to the voltage and current detected by the first detection circuit and the second detection circuit. In some embodiments, the dc conversion circuit includes a first transistor, a first inductor, a first capacitor, and a first diode; The first end of the first transistor is connected with the negative electrode of the power supply, the second end of the first transistor is connected with the negative electrode of the first diode, the third end of the first transistor is connected with the driving circuit, the first end of the first inductor is connected with the positive electrode of the power supply, the second end of the first inductor is connected with the negative electrode of the first diode, the first end of the first capacitor is connected with the first end of the first inductor, the second end of the first capacitor is connected with the second end of the first inductor, the positive electrode of the first diode is connected with the second end of the first capacitor, and the first end and the second end of the first capacitor are connected with the resonant transformer circuit. In some embodiments, the first transistor is a MOS transistor. In some embodiments, the resonant transformer circuit includes a second transistor, a third transistor, a seco