A Constant Current Charging System for Deep Well Pulse Capacitor

Abstract

The invention discloses a constant-current charging system of a deep well pulse capacitor. The constant-current charging system comprises a first device, a cable, a second device and a pulse capacitor, wherein the first device is arranged on the ground; the second device is arranged in the well; the first device converts a 220V power-frequency AC power supply into a medium-frequency high-voltage AC power supply and then transmits the medium-frequency high-voltage AC power supply to the second device through the cable; the second device converts the medium-frequency high-voltage AC power supply into the required high-voltage DC power supply and directly charges the pulse capacitor; the voltage of the pulse capacitor is measured through a resistance voltage divider; a control program calculates a mean charging current through an increment of the voltage of the pulse capacitor, and changes the mean charging current by adjusting a drive pulse width of a switch tube in an inverter circuit to form closed-loop control, so that the constant mean charging current is achieved. By the closed-loop control method, constant-current charging of the deep well pulse capacitor is achieved; the charging speed and the energy utilization rate are improved; the structure of a downhole device is simplified; and the reliability of a charging system is improved.

Description

technical field [0001] The invention belongs to the fields of high voltage technology and pulse power technology, and more specifically relates to a constant current charging system for deep well pulse capacitors. Background technique [0002] With the continuous deepening of the research on pulse power technology, pulse power devices are more and more applied to industrial and civil fields, oil well deblocking, mine geophysical prospecting and underwater target detection are important aspects. However, due to the particularity of these fields, pulse power devices generally need to work thousands of meters underground, so higher requirements are put forward for the deep well pulse capacitor charging system. [0003] At present, the deep well pulse capacitor charging system generally adopts the constant voltage charging method. The power frequency mains on the ground is directly transmitted to the underground step-up transformer through the logging cable, or transmitted to th...

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Problems solved by technology

[0004] Aiming at the shortcomings of the prior art, the object of the present invention is to provide a constant current charging system for pulse capacitors in deep wells, which aims to solve the problems of slow charging speed, large downhole components and low energy utilization rate of existing charging devices

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