An energy supply system

Abstract

This invention discloses a power supply system comprising: a high-voltage isolation transformer module, including n high-voltage isolation transformer units connected in series sequentially; each high-voltage isolation transformer unit including a first insulating bushing and an isolation transformer disposed within the first insulating bushing; and every two adjacent first insulating bushings being connected through a first gas connecting pipe to form a power supply system gas path; wherein n is a positive integer greater than 1; and a gas monitoring component, connected to ground potential and connected to the power supply system gas path, for monitoring the gas path parameters of the power supply system gas path. This invention, by connecting the gas paths of each insulating bushing to form a continuous power supply system gas path, requires only one gas monitoring component to monitor the gas path of each insulating bushing. Furthermore, by connecting the gas monitoring component to ground potential, overvoltage damage to the gas monitoring component can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a power supply system. Background Technology

[0002] High-voltage direct current (HVDC) power electronic devices are composed of individual power electronic devices connected in series. Each power electronic device requires an independent drive circuit for control, and the drive circuit needs to be powered to operate. The power electronic devices operate at a high potential, and each drive circuit and the power electronic device it controls are at the same potential. Therefore, the drive circuit also operates at a high potential and cannot be directly powered by a low-potential source. Since the current in a DC transmission line is constant, the drive circuit cannot directly obtain energy from the alternating electromagnetic field in the line. Therefore, an independent power supply system is needed to transfer electrical energy from a low potential to a high potential.

[0003] The power supply system consists of multiple transformers connected in series. To transfer electrical energy from a low potential to a high potential, high-voltage insulation is required between the primary and secondary windings of each transformer. The medium used for high-voltage insulation is generally solid or gaseous, with SF6 being the commonly used gaseous insulating medium. For equipment filled with SF6 gas, gas monitoring equipment must be installed, and the monitoring data must be sent to a monitoring backend. For gas-insulated power supply systems, the transformers connected in series are arranged in multiple bushings connected in series. Currently, the commonly used gas monitoring scheme is that each bushing has an independent gas path, and each bushing is equipped with a set of gas monitoring equipment. However, in actual operation, it has been found that gas monitoring equipment at ground potential rarely fails, while gas monitoring equipment at high potential is frequently damaged by overvoltage due to electromagnetic interference. Even with overvoltage limiting devices, it still frequently fails. After a gas monitoring equipment failure, power must be cut off for repair in a timely manner, which seriously affects the availability of high-voltage DC power electronic equipment.

[0004] Therefore, existing technologies still need to be improved and enhanced. Summary of the Invention

[0005] The purpose of this invention is to provide an energy supply system that connects the gas paths of each insulating bushing to form a continuous energy supply system gas path. Only one gas monitoring component is needed to monitor the gas path of each insulating bushing. By connecting the gas monitoring component to ground potential, overvoltage damage to the gas monitoring component can be effectively avoided.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This application provides an energy supply system, including:

[0008] The high-voltage isolation transformer module includes n high-voltage isolation transformer units connected in series in succession. Each high-voltage isolation transformer unit includes a first insulating bushing and an isolation transformer disposed in the first insulating bushing. Every two adjacent first insulating bushings are connected and connected through a first gas connecting pipe to form a power supply system gas path. Here, n is a positive integer greater than 1.

[0009] A gas monitoring component, connected to ground potential and in communication with the gas path of the power supply system, is used to monitor the gas path parameters of the power supply system.

[0010] In some embodiments of the power supply system, each first insulating sleeve includes an opposing top end and a bottom end, and the top end of the preceding first insulating sleeve is connected to the bottom end of the subsequent first insulating sleeve via a first gas connection pipe.

[0011] In some embodiments of the power supply system, the gas monitoring component is connected to the bottom end of the first-stage first insulating sleeve or the top end of the nth-stage first insulating sleeve via a second gas connection pipe, so as to communicate with the gas path of the power supply system.

[0012] In some embodiments of the power supply system, the gas monitoring component is connected to any one of the first gas connecting pipes via a third gas connecting pipe to communicate with the gas path of the power supply system.

[0013] In some embodiments of the power supply system, each high-voltage isolation transformer unit further includes a resistor-capacitor assembly disposed in a first insulating bushing, the resistor-capacitor assembly being connected in parallel with the isolation transformer.

[0014] In some embodiments of the power supply system, each high-voltage isolation transformer unit further includes a second insulating bushing and a resistor-capacitor assembly disposed in the second insulating bushing, the resistor-capacitor assembly being connected in parallel with the isolation transformer; each second insulating bushing is connected to the gas circuit of the power supply system.

[0015] In some embodiments of the power supply system, each second insulating sleeve includes an opposite top or bottom end, every two adjacent second insulating sleeves are connected by a fourth gas connection pipe, and the bottom end of the first-level second insulating sleeve is connected to the bottom end of the first-level first insulating sleeve by a fifth gas connection pipe, or the top end of the nth-level second insulating sleeve is connected to the top end of the nth-level first insulating sleeve by a sixth gas connection pipe.

[0016] In some embodiments of the power supply system, each second insulating bushing includes an opposing top or bottom end. In each high-voltage isolation transformer unit, the top end of the second insulating bushing is connected to the top end of the first insulating bushing via a seventh gas connection pipe, or the bottom end of the second insulating bushing is connected to the bottom end of the first insulating bushing via an eighth gas connection pipe.

[0017] In some embodiments of the power supply system, the RC component includes a resistor and a capacitor connected in parallel.

[0018] In some embodiments of the power supply system, the gas path parameters include at least one of pressure parameters, temperature parameters, micro-water parameters, flow rate parameters, and decomposition product parameters.

[0019] Compared to existing technologies, this invention provides a power supply system that connects the first insulating bushings in each high-voltage isolation transformer unit via a first gas connection pipe, forming a continuous power supply system gas path. Therefore, only one gas monitoring component needs to be connected to the power supply system circuit to monitor the gas path parameters. This eliminates the need for a separate gas monitoring component for each first insulating bushing, reducing the cost of the power supply system. Furthermore, connecting the gas monitoring component to ground potential effectively prevents overvoltage damage due to electromagnetic interference, thereby improving the availability of high-voltage DC power electronic equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first connection method for the power supply system provided by the present invention.

[0021] Figure 2 This is a second connection diagram of the power supply system provided by the present invention.

[0022] Figure 3 This is a third connection diagram of the power supply system provided by the present invention.

[0023] Figure 4 This is a schematic diagram of a first connection between the first insulating sleeve and the second insulating sleeve in the power supply system provided by the present invention.

[0024] Figure 5 This is a fourth connection diagram of the power supply system provided by the present invention.

[0025] Figure 6 This is a schematic diagram of a second connection between the first insulating sleeve and the second insulating sleeve in the power supply system provided by the present invention.

[0026] Figure 7 This is a schematic diagram of a third connection between the first insulating sleeve and the second insulating sleeve in the power supply system provided by the present invention.

[0027] Figure 8 This is a schematic diagram of a fourth connection between the first insulating sleeve and the second insulating sleeve in the power supply system provided by the present invention.

[0028] Figure 9 The fifth connection diagram of the power supply system provided by the present invention.

[0029] Figure 10 The sixth connection diagram of the power supply system provided by the present invention.

[0030] Figure 11 The seventh connection diagram of the power supply system provided by the present invention. Detailed Implementation

[0031] The purpose of this invention is to provide an energy supply system that connects the gas paths of each insulating bushing to form a continuous energy supply system gas path. Only one gas monitoring component is needed to monitor the gas path of each insulating bushing. By connecting the gas monitoring component to ground potential, overvoltage damage to the gas monitoring component can be effectively avoided.

[0032] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] Please see Figure 1 The present invention provides an energy supply system comprising a high-voltage isolation transformer module 10 and a gas monitoring component 30. The high-voltage isolation transformer module 10 includes n high-voltage isolation transformer units 11 connected in series. Each high-voltage isolation transformer unit 11 includes a first insulating bushing 101 and an isolation transformer 102 disposed within the first insulating bushing 101. Every two adjacent first insulating bushings 101 are connected and permeated by a first gas connecting pipe 21 to form an energy supply system gas path; where n is a positive integer greater than 1. The gas monitoring component 30 is connected to ground potential and communicates with the energy supply system gas path to monitor the gas path parameters. The high-voltage isolation transformer module 10 receives low-potential AC voltage and converts it into a high-potential AC voltage for output. Each stage of the high-voltage isolation transformer module 10 boosts the input AC voltage and outputs the boosted AC voltage. In contrast, in this embodiment, the first-stage high-voltage isolation transformer unit 11 in the high-voltage isolation transformer module 10 is used to receive low-potential AC voltage, and the nth-stage high-voltage isolation transformer unit 11 is used to output high-potential AC voltage, with the voltage being increased step by step from the first-stage high-voltage isolation transformer unit 11 to the nth-stage high-voltage isolation transformer unit 11.

[0034] In this embodiment, by connecting the first insulating bushing 101 in each high-voltage isolation transformer unit 11 through the first gas connection pipe 21, a continuous power supply system gas path is formed. Therefore, only one gas monitoring component 30 needs to be connected to the power supply system circuit to monitor the gas path parameters. Compared to setting a gas monitoring component 30 for each first insulating bushing 101, this eliminates the need for multiple gas monitoring components 30, saving on the cost of the power supply system. Simultaneously, connecting the gas monitoring component 30 to ground potential effectively prevents it from being damaged by electromagnetic interference due to overvoltage, thereby improving the availability of the high-voltage DC power electronic equipment.

[0035] Specifically, in this embodiment, each first insulating sleeve 101 includes a top end and a bottom end, and the top end of the previous first insulating sleeve 101 is connected to the bottom end of the next first insulating sleeve 101 through a first gas connection pipe 21.

[0036] The gas monitoring component 30 can be connected to the bottom end of the first-stage first insulating sleeve 101 via the second gas connection pipe 22 (e.g., Figure 1 As shown), it can also be connected to the top end of the nth-stage first insulating sleeve 101 via the second gas connection pipe (as shown). Figure 2 As shown), it can also be connected to any of the first gas connecting pipes 21 via the third gas connecting pipe 23 (e.g., Figure 3 (as shown), to be connected to the gas path of the power supply system, but the present invention does not limit this.

[0037] It should be noted that in this embodiment, when the potential at the top or bottom of the first insulating sleeve 101 connected to the gas monitoring component 30 is greater than zero potential, then the second gas connecting pipe 22 or the third gas connecting pipe 23 connecting the gas monitoring component 30 and the top or bottom of the first insulating sleeve 101 is an insulating connecting pipe.

[0038] In some embodiments, each high-voltage isolation transformer unit 11 further includes a resistor-capacitor assembly 202 disposed in the first insulating bushing 101, the resistor-capacitor assembly 202 being connected in parallel with the isolation transformer 102. Specifically, the resistor-capacitor assembly 202 includes a capacitor 2022 and a resistor 2021, which are connected in parallel and both are connected in parallel with the isolation transformer 102. In this embodiment, the capacitor 2022 is a voltage equalization capacitor, which plays a dynamic voltage equalization role, ensuring that the voltage distribution of each isolation transformer 102 is equal when subjected to impulse voltage intrusion. In this embodiment, the resistor 2021 is a voltage equalization resistor, which plays a static voltage equalization role, ensuring that the voltage distribution of each isolation transformer 102 is equal during normal operation.

[0039] In some embodiments, please refer to Figure 4The RC component 202 can also be separately installed in another insulating bushing. Specifically, each high-voltage isolation transformer unit 11 also includes a second insulating bushing 201 and an RC component 202 installed in the second insulating bushing 201. The RC component 202 is connected in parallel with the isolation transformer 102. Each second insulating bushing 201 is connected to the air passage of the power supply system, thereby ensuring that the air passage of each second insulating bushing 201 forms a continuous air passage with the air passage of the first insulating bushing 101. By installing the RC component 202 and the isolation transformer 102 in two separate insulating bushings, compared to installing the RC component 202 and the isolation transformer 102 in the same insulating bushing, when the power supply system fails and needs maintenance, the two independent insulating bushings can be individually separated according to the fault factor, which facilitates maintenance.

[0040] For specific implementation details, please refer to the following: Figure 4 In some embodiments, each second insulating sleeve 201 includes opposing top and bottom ends. Each pair of adjacent second insulating sleeves 201 is connected by a fourth gas connecting pipe 24, and the bottom end of the first-stage second insulating sleeve 201 is connected to the bottom end of the first-stage first insulating sleeve 101 via a fifth gas connecting pipe 25. That is, in this embodiment, each second insulating sleeve 201 is connected in series via a fourth gas connecting pipe 24, independent of the first gas connecting pipe 21. Then, the bottom end of the first-stage second insulating sleeve 201 is connected to the bottom end of the first-stage first insulating sleeve 101 via the fifth gas connecting pipe 25 to communicate with the gas path of the power supply system, thus forming a through gas path between each second insulating sleeve 201 and the gas path of the power supply system.

[0041] As one example, please refer to Figure 5 If the gas monitoring component 30 is connected to the bottom end of the first insulating sleeve 101 of the first stage through the second gas connection pipe 22, the fifth gas connection pipe 25 can be directly connected to the second gas connection pipe 22 to connect to the bottom end of the first insulating sleeve 101 of the first stage, thereby making each second insulating sleeve 201 connected to the gas path of the power supply system to form a through gas path.

[0042] Of course, in some embodiments, please refer to Figure 6 When each pair of adjacent second insulating sleeves 201 are connected in series through the fourth gas connecting pipe 24, the top end of the nth-level second insulating sleeve 201 can also be connected to the top end of the nth-level first insulating sleeve 101 through the sixth gas connecting pipe 26 to connect with the gas path of the power supply system, so that each second insulating sleeve 201 is connected with the gas path of the power supply system to form a through gas path.

[0043] As one embodiment, if the gas monitoring component 30 is connected to the top end of the nth-level first insulating sleeve 101 through the second gas connection pipe 22, the sixth gas connection pipe 26 can be directly connected to the second gas connection pipe 22 to connect to the top end of the nth-level first insulating sleeve 101, thereby enabling each second insulating sleeve 201 to connect with the gas path of the power supply system to form a through gas path.

[0044] In some embodiments, please refer to the following: Figure 7 and Figure 8 Each second insulating bushing 201 includes an opposing top or bottom end. In each high-voltage isolation transformer unit 11, the top end of the second insulating bushing 201 is connected to the top end of the first insulating bushing 101 via a seventh gas connection pipe 27 (e.g., Figure 7 (as shown), or the bottom end of the second insulating sleeve 201 is connected to the bottom end of the first insulating sleeve 101 via the eighth gas connection pipe 28 (as shown). Figure 8 (As shown).

[0045] That is, in this embodiment, the multiple second insulating sleeves 201 are not connected in series adjacent to each other, but in each high-voltage isolation transformer unit 11, the second insulating sleeve 201 is directly connected to the first insulating sleeve 101; specifically, the top end of the second insulating sleeve 201 can be connected to the top end of the first insulating sleeve 101 through the seventh gas connection pipe 27, or the bottom end of the second insulating sleeve 201 can be connected to the bottom end of the first insulating sleeve 101 through the eighth gas connection pipe 28.

[0046] In this configuration, apart from the high-voltage isolation transformer units 11 at both ends of the high-voltage isolation transformer module 10, in each intermediate high-voltage isolation transformer unit 11, if the top end of the second insulating sleeve 201 is connected to the top end of the first insulating sleeve 101 via the seventh gas connection pipe 27, the seventh gas connection pipe 27 can then be directly connected to the first gas connection pipe 21 to achieve connection with the top end of the first insulating sleeve 101 (e.g., Figure 7 (As shown). Similarly, if the bottom end of the second insulating sleeve 201 is connected to the bottom end of the first insulating sleeve 101 through the eighth gas connecting pipe 28, the eighth gas connecting pipe 28 can then be directly connected to the first gas connecting pipe 21 to achieve connection with the bottom end of the first insulating sleeve 101 (as shown). Figure 8 (As shown).

[0047] In other words, in some embodiments, the second insulating sleeve 201 equipped with a resistor-capacitor assembly is connected to the first insulating sleeve 101, which has an isolation transformer arranged at both ends with the same potential. Specifically, the connection can be made by connecting the top end of the first insulating sleeve 101 to the top end of the second insulating sleeve 201, or by connecting the bottom end of the first insulating sleeve 101 to the bottom end of the second insulating sleeve 201, thereby achieving a through-flow air passage formed by connecting each second insulating sleeve 201 to the air passage of the power supply system.

[0048] Please refer to Figure 9 In an embodiment where the top end of the second insulating sleeve 201 is connected to the top end of the first insulating sleeve 101 via the seventh gas connection pipe 27, if the gas monitoring component 30 is connected to the top end of the nth-stage first insulating sleeve 101 via the second gas connection pipe 22, then in the nth-stage high-voltage isolation transformer unit 11, the seventh gas connection pipe 27 connected to the top end of the nth-stage second insulating sleeve 201 can be directly connected to the second gas connection pipe 22 to achieve connection with the top end of the nth-stage first insulating sleeve 101. Alternatively, the gas monitoring component 30 can also be directly connected to the bottom end of the first-stage first insulating sleeve 101 via the second gas connection pipe 22 (e.g., ...). Figure 10 (As shown).

[0049] Please see Figure 11 In an embodiment where the bottom end of the second insulating sleeve 201 is connected to the bottom end of the first insulating sleeve 101 via the eighth gas connection pipe 28, if the gas monitoring component 30 is connected to the bottom end of the first-stage first insulating sleeve 101 via the second gas connection pipe 22, then in the first-stage high-voltage isolation transformer unit 11, the eighth gas connection pipe 28 connected to the bottom end of the first-stage second insulating sleeve 201 can be directly connected to the second gas connection pipe 22 to achieve connection with the bottom end of the first-stage first insulating sleeve 101.

[0050] In this embodiment, the first gas connecting pipe, the second gas connecting pipe, the third gas connecting pipe, the fourth gas connecting pipe, the fifth gas connecting pipe, the sixth gas connecting pipe, the seventh gas connecting pipe, and the eighth gas connecting pipe can all be flexible hoses. Using flexible hoses as gas connecting pipes results in a simple structure that is easy to install and replace.

[0051] In some embodiments, the gas monitoring component 30 includes at least one of a pressure sensor, a temperature sensor, a micro-moisture sensor, a flow sensor, and a decomposition product sensor. The gas path parameters include at least one of pressure parameters, temperature parameters, micro-moisture parameters, flow parameters, and decomposition product parameters.

[0052] In practical implementation, three or more of the same type of sensor can be independently set according to different needs. For example, in this embodiment, at least three independent pressure sensors and at least three independent micro-moisture sensors can be set. The three pressure sensors simultaneously monitor the pressure parameters in the gas path of the power supply system, using a two-out-of-three logic. When two of the pressure sensors detect abnormal pressure parameters, the gas monitoring component 30 will execute corresponding protection or alarm actions. Similarly, the three independent micro-moisture sensors also use a two-out-of-three logic to monitor micro-moisture parameters. In this embodiment, setting multiple independent sensors to monitor the same gas path parameters can effectively avoid false alarms caused by a single sensor monitoring, thus improving the accuracy of monitoring.

[0053] In summary, the power supply system provided by this invention includes a high-voltage isolation transformer module, comprising n high-voltage isolation transformer units connected in series sequentially. Each high-voltage isolation transformer unit includes a first insulating bushing and an isolation transformer disposed within the first insulating bushing. Every two adjacent first insulating bushings are connected through a first gas connecting pipe to form a power supply system gas path; where n is a positive integer greater than 1. A gas monitoring component, connected to ground potential and in communication with the power supply system gas path, is used to monitor the gas path parameters of the power supply system gas path. This invention, by connecting the gas paths of each insulating bushing to form a continuous power supply system gas path, requires only one gas monitoring component to monitor the gas path of each insulating bushing. Furthermore, by connecting the gas monitoring component to ground potential, overvoltage damage to the gas monitoring component can be effectively avoided.

[0054] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. An energy supply system, characterized in that, include: A high-voltage isolation transformer module includes n high-voltage isolation transformer units connected in series in succession. Each high-voltage isolation transformer unit includes a first insulating bushing and an isolation transformer disposed in the first insulating bushing. Every two adjacent first insulating bushings are connected through a first gas connecting pipe to form a power supply system gas path. Each first insulating bushing includes a top end and a bottom end. The top end of the first insulating bushing in the previous stage is connected to the bottom end of the first insulating bushing in the next stage through the first gas connecting pipe. Wherein, n is a positive integer greater than 1. A gas monitoring component, connected to ground potential and in communication with the gas path of the power supply system, is used to monitor the gas path parameters of the power supply system.

2. The energy supply system according to claim 1, characterized in that, The gas monitoring component is connected to the bottom end of the first insulating sleeve of the first stage via a second gas connection pipe, or to the top end of the first insulating sleeve of the nth stage, so as to communicate with the gas path of the power supply system.

3. The energy supply system according to claim 1, characterized in that, The gas monitoring component is connected to any one of the first gas connecting pipes via a third gas connecting pipe to communicate with the gas path of the power supply system.

4. The energy supply system according to any one of claims 1-3, characterized in that, Each of the high-voltage isolation transformer units further includes a resistor-capacitor assembly disposed in the first insulating bushing, the resistor-capacitor assembly being connected in parallel with the isolation transformer.

5. The energy supply system according to claim 2 or 3, characterized in that, Each of the high-voltage isolation transformer units further includes a second insulating bushing and a resistor-capacitor assembly disposed in the second insulating bushing, the resistor-capacitor assembly being connected in parallel with the isolation transformer; each of the second insulating bushings is connected to the gas circuit of the power supply system.

6. The energy supply system according to claim 5, characterized in that, Each second insulating sleeve includes an opposing top or bottom end, and every two adjacent second insulating sleeves are connected by a fourth gas connection pipe. The bottom end of the first-level second insulating sleeve is connected to the bottom end of the first-level first insulating sleeve by a fifth gas connection pipe, or the top end of the nth-level second insulating sleeve is connected to the top end of the nth-level first insulating sleeve by a sixth gas connection pipe.

7. The energy supply system according to claim 5, characterized in that, Each of the second insulating bushings includes an opposing top or bottom end. In each of the high-voltage isolation transformer units, the top end of the second insulating bushing is connected to the top end of the first insulating bushing via a seventh gas connection pipe, or the bottom end of the second insulating bushing is connected to the bottom end of the first insulating bushing via an eighth gas connection pipe.

8. The energy supply system according to claim 7, characterized in that, The gas monitoring component includes at least one of a pressure sensor, a temperature sensor, a micro-water sensor, a flow sensor, and a decomposition product sensor.

9. The energy supply system according to claim 8, characterized in that, The gas path parameters include at least one of the following: pressure parameters, temperature parameters, micro-water parameters, flow rate parameters, and decomposition product parameters.

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