UHV power supply and system

Abstract

The present invention relates to an ultra-high voltage line energy-taking power supply and system. The ultra-high voltage line energy-taking power supply includes an energy-taking unit that obtains electric energy from the ultra-high voltage line and converts it into a stable direct current power supply output, an energy supply unit that converts the stable direct current power supply into a load alternating current / direct current power supply and provides it to the load, and an equipotential connecting line, wherein the two ends of the equipotential connecting line are respectively connected to the ultra-high voltage line and the output end of the energy supply unit. The energy-taking unit includes an energy-taking device that obtains electric energy from the ultra-high voltage line, and an AC / DC energy-taking management circuit that converts the electric energy obtained by the energy-taking device into a stable direct current power supply and outputs it. The energy supply unit includes a DC / AC or DC / DC constant current or constant voltage load management circuit that converts the stable direct current power supply into a load alternating current / direct current power supply and provides it to the load. The ultra-high voltage line energy-taking system includes the aforementioned ultra-high voltage line energy-taking power supply and management end. The present invention can directly obtain energy on the ultra-high voltage line and provide stable and reliable electric energy to the load.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply and a system capable of directly obtaining energy from an ultra-high voltage line. Background Art

[0002] On June 25, 2020, the Zhangbei 500kV flexible direct current grid test demonstration project was successfully networked, which means that the DC UHV networking technology is becoming mature, and the large-scale networking of DC UHV lines is about to begin. Immediately afterwards, the networking of DC 800kV and DC 1100kV UHV power grids will be promoted. According to the technical requirements of DC 800kV and DC 1100kV UHV power grids, the insulation withstand voltage stress requirements of UHV equipment for energy supply equipment are getting higher and higher. Traditional isolated power supplies can no longer meet the insulation withstand voltage stress requirements of UHV equipment, which will become a restriction on the progress of the networking technology of DC 800kV and DC 1100kV UHV power grids. Therefore, in order to meet the insulation withstand voltage stress requirements of energy supply equipment and improve the operational reliability of UHV DC power grids, it is necessary to design a new power supply device. Summary of the invention

[0003] The object of the present invention is to provide a UHV line energy-taking power supply with high insulation withstand voltage and high reliability, which is particularly suitable for supplying energy to UHV equipment in UHV DC flexible networking.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A power supply for obtaining energy from an ultra-high voltage line is used to provide electric energy for a load. The power supply for obtaining energy from an ultra-high voltage line comprises an energy obtaining unit for obtaining electric energy from an ultra-high voltage line and converting it into a stable direct current power supply output, an energy supply unit for converting the stable direct current power supply into a load alternating current / direct current power supply and providing it to the load, and an equipotential connecting line. The input end of the energy obtaining unit is connected to the ultra-high voltage line, the output end of the energy obtaining unit is connected to the input end of the energy supply unit, the two ends of the equipotential connecting line are respectively connected to the ultra-high voltage line and the output end of the energy supply unit, and the load is connected to the output end of the energy supply unit.

[0006] The energy acquisition unit includes an energy acquisition device for acquiring electric energy from an ultra-high voltage line, and an AC / DC energy acquisition management circuit for converting the electric energy acquired by the energy acquisition device into the stable direct current power supply and outputting it.

[0007] The energy extraction device comprises an energy extraction ring for converting the magnetic field generated when the ultra-high voltage line transmits current into electrical energy.

[0008] The energy extraction ring is arranged on the UHV line.

[0009] The AC / DC energy management circuit includes an AC / DC conversion module that constitutes an energy acquisition loop, a sampling module for obtaining the current on the ultra-high voltage line and outputting a corresponding sampling signal, and an adjustment module for adjusting the impedance of the energy acquisition loop based on the sampling signal.

[0010] The energy supply unit includes a DC / AC constant current or constant voltage load management circuit for converting the stable DC power supply into a load AC power supply and providing it to the load, or the energy supply unit includes a DC / DC constant current or constant voltage load management circuit for converting the stable DC power supply into a load DC power supply and providing it to the load.

[0011] The ultra-high voltage line energy supply also includes a communication module for realizing communication between the AC / DC energy management circuit, the DC / AC constant current or constant voltage load management circuit, or the DC / DC constant current or constant voltage load management circuit and a management end.

[0012] The communication module is a RS485 or TCP / IP module.

[0013] The present invention also provides an ultra-high voltage line energy taking system based on the above ultra-high voltage line energy taking power supply, and the scheme thereof is:

[0014] A UHV line energy taking system comprises the UHV line energy taking power source and a management terminal as described above. The management terminal is an UHV power grid information management platform.

[0015] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the present invention can directly obtain energy on the UHV line, has the advantages of high insulation tolerance voltage stress, safe and reliable operation, etc., and is suitable for supplying energy to UHV equipment in DC UHV flexible networking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the UHV line energy supply of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0018] Embodiment 1: As shown in the attached Figure 1 As shown, a UHV line energy-taking power supply includes an energy-taking unit, an energy-supply unit and an equipotential connecting line. The input end of the energy-taking unit is connected to the UHV line, the output end of the energy-taking unit is connected to the input end of the energy-supply unit, and the load is connected to the output end of the energy-supply unit, so that the UHV line energy-taking power supply can provide electric energy to the load.

[0019] The energy acquisition unit is used to acquire electric energy from the UHV line and convert it into a stable DC power supply output. The energy acquisition unit includes an energy acquisition device and an AC / DC energy acquisition management circuit. The energy acquisition device is used to acquire electric energy from the UHV line. Since the UHV line will generate a magnetic field in the space near it when transmitting current, the energy acquisition device can use an energy acquisition ring that can convert the magnetic field generated by the UHV line when transmitting current into electric energy. The energy acquisition ring is set on the UHV line. The AC / DC energy acquisition management circuit is used to convert the electric energy acquired by the energy acquisition device into a stable DC power supply and output it. Since the randomness of the current transmitted on the UHV line varies greatly, in order to obtain a relatively stable power supply, it is necessary to configure the AC / DC energy acquisition management circuit. The AC / DC energy acquisition management circuit adjusts the impedance of the energy acquisition circuit according to the magnitude of the current on the UHV line, so that the voltage obtained is relatively stable. Therefore, the AC / DC energy acquisition management circuit includes an AC / DC conversion module that constitutes an energy acquisition circuit, a sampling module for acquiring the current magnitude on the UHV line and outputting a corresponding sampling signal, and an adjustment module for adjusting the impedance of the energy acquisition circuit based on the sampling signal.

[0020] The energy supply unit is used to convert a stable DC power supply into an AC / DC power supply for a load and provide it to a load (such as an ultra-high voltage device). The energy supply unit includes a DC / AC constant current or constant voltage load management circuit for converting a stable DC power supply output by the energy extraction unit into an AC power supply for a load and providing it to a load, or the energy supply unit includes a DC / DC constant current or constant voltage load management circuit for converting a stable DC power supply output by the energy extraction unit into a DC power supply for a load and providing it to a load. The above-mentioned DC / AC or DC / DC constant current or constant voltage load management circuit can further improve the energy conversion efficiency, which maintains the highest energy conversion efficiency, thereby maintaining stable operation of the load.

[0021] The two ends of the equipotential bonding wire are respectively connected to the output end of the UHV line and the energy supply unit, so that the obtained energy is connected to the UHV line at the same potential, so the withstand voltage stress of the power supply is equal to that of the UHV line.

[0022] The above-mentioned UHV line energy supply also includes a communication module, through which the AC / DC energy management circuit, the DC / AC constant current or constant voltage load management circuit or the DC / DC constant current or constant voltage load management circuit can communicate with the management end, so that the energy management circuit and the load management circuit (including the DC / AC constant current or constant voltage load management circuit and the DC / DC constant current or constant voltage load management circuit) can return the load condition of the UHV end to the management end through the communication module, and can also manage the load through the management end. The communication module can be set in two parts, which are respectively connected to the energy management circuit and the load management circuit. The communication module can adopt RS485 or TCP / IP module, etc.

[0023] Based on the above-mentioned UHV line energy supply, a UHV line energy supply system can be constructed. The UHV line energy supply system includes the above-mentioned UHV line energy supply with a communication module and a management end communicating with the power supply, wherein the management end is a UHV power grid information management platform.

[0024] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A UHV power supply for providing power to a load, characterized by: The UHV line energy supply includes an energy taking unit that takes electric energy from the UHV line and converts it into a stable DC power supply output, an energy supply unit that converts the stable DC power supply into a load AC / DC power supply and provides it to the load, and an equipotential bonding line, wherein the input end of the energy taking unit is connected to the UHV line, the output end of the energy taking unit is connected to the input end of the energy supply unit, the two ends of the equipotential bonding line are respectively connected to the UHV line and the output end of the energy supply unit, and the load is connected to the output end of the energy supply unit; The energy acquisition unit includes an energy acquisition device for acquiring electric energy from an ultra-high voltage line, an AC / DC energy acquisition management circuit for converting the electric energy acquired by the energy acquisition device into the stable DC power supply and outputting it, and the AC / DC energy acquisition management circuit includes an AC / DC conversion module constituting an energy acquisition loop, a sampling module for acquiring the current on the ultra-high voltage line and outputting a corresponding sampling signal, and an adjustment module for adjusting the impedance of the energy acquisition loop based on the sampling signal; The energy supply unit includes a DC / AC constant current or constant voltage load management circuit for converting the stable DC power supply into a load AC power supply and providing it to the load, or the energy supply unit includes a DC / DC constant current or constant voltage load management circuit for converting the stable DC power supply into a load DC power supply and providing it to the load.

2. The UHV line energy source according to claim 1, characterized in that: The energy extraction device comprises an energy extraction ring for converting the magnetic field generated when the ultra-high voltage line transmits current into electrical energy.

3. The UHV line energy source according to claim 2, characterized in that: The energy extraction ring is arranged on the UHV line.

4. The UHV line energy source according to claim 1, characterized in that: The ultra-high voltage line energy supply also includes a communication module for realizing communication between the AC / DC energy management circuit, the DC / AC constant current or constant voltage load management circuit, or the DC / DC constant current or constant voltage load management circuit and a management end.

5. The UHV line energy source according to claim 4, characterized in that: The communication module is a RS485 or TCP / IP module.

6. A UHV line energy extraction system, characterized in that: The UHV line energy extraction system comprises the UHV line energy extraction power supply and management terminal as described in claim 4 or 5.

7. The UHV line energy extraction system according to claim 6, characterized in that: The management end is an ultra-high voltage power grid information management platform.

Images