High-voltage alternating electric field energy taking system based on capacitor series-parallel connection conversion and switching power supply mode

Abstract

The invention discloses a high-voltage alternating electric field energy taking system based on capacitor series-parallel connection conversion and a switching power supply mode. The high-voltage alternating electric field energy taking system comprises a high-voltage conductor, a rectifier bridge, a ground distributed capacitor, a first switching transistor, a second switching transistor, a series-parallel connection capacitor branch, a transformer, a rectifier diode, an output capacitor and a control unit. The high-voltage conductor is connected with a first input end of the rectifier bridge, a second input end of the rectifier bridge is grounded after passing through the ground distributed capacitor, a positive output end of the rectifier bridge is connected with one end of the second switch transistor, and the other end of the second switch transistor is connected with the series-parallel capacitor branch and one end of a primary winding in the transformer; the other end of the primary winding in the transformer is grounded after passing through the first switch transistor, one end of the secondary winding in the transformer is connected with the other end of the secondary winding in the transformer through the rectifier diode and the output capacitor, and the system is high in reliability.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power systems, and relates to a high-voltage alternating electric field energy harvesting system based on capacitance series-parallel conversion and switching power supply mode. Background technique [0002] With the development of smart grid online monitoring technology, when it is necessary to monitor the high-potential equipment in the power system, how to solve the power supply problem of the monitoring front-end equipment has become a technical difficulty. There are currently two power supply methods, including self-excited energy harvesting and transmission power supply. [0003] The transmission power supply method mainly uses optical fiber or microwave to transmit energy from the low potential end to the online measurement device at the high potential end. Its main disadvantages are low efficiency, high cost, and poor long-term working stability. [0004] The technical solutions for i...

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Problems solved by technology

[0003] The transmission power supply method mainly transmits energy from the low-potential end to the high-potential end online measurement device through optical fiber or microwave. Its main disadvantages are low efficiency, high cost, and poor long-term working stability.

[0004] The technical solutions for independent energy harvesting mainly include battery power supply, CT coil power supply, solar energy and wind energy power supply. All of the above power harvesting methods have certain technical limitations. For example, the battery method needs to be replaced by regular power failure, and the CT type is affected by the load current , and the line cannot work normally when there is a power failure, there is a large power supply blind area, and it is difficult to guarantee the stability of the power supply; other methods are limited by natural conditions, which will also affect the stability of the power supply

[0005] Using the alternating electric field of the high-voltage transmission line and the distributed capacitance to the ground to directly charge the energy harvesting capacitor, because the power conversion efficiency is too low, the power provided by the power supply cannot meet the real-time acquisition and transmission tasks of the relevant monitoring signals. If the energy capacitor and its control unit are directly connected in series to increase its energy extraction power, it will increase the size and power consumption of the control system, and will reduce the reliability of the power system due to the increase in system complexity.

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