Variable-voltage variable-frequency emergency power supply device and method and application

Abstract

The invention relates to the field of petrochemical engineering, and particularly discloses a variable-voltage variable-frequency emergency power supply device and method and application, and the device comprises a high-voltage power supply switching-on and switching-off device which is used for switching on or switching off the electrical connection between a high-voltage power supply and a load; the energy storage power supply module comprises an energy storage device, an inversion unit and a transformer which are electrically connected in sequence, and the other end of the transformer is electrically connected with the load; and the charging module comprises a charging switch and a charging device which are electrically connected in sequence, the other end of the charging switch is electrically connected with a low-voltage power supply, and the other end of the charging device is electrically connected with the charging port of the energy storage device. According to the variable-voltage variable-frequency emergency power supply device, the high-voltage power supply on-off device, the energy storage power supply module and the charging module work cooperatively, the problems of short-time or long-time voltage interruption and the like in high-risk industries such as petrochemical engineering are effectively solved, and the variable-voltage variable-frequency emergency power supply device has the advantages of being good in stability, high in reliability, high in efficiency, low in investment and small in occupied space.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of petrochemical industry, in particular to a variable-voltage variable-frequency emergency power supply device and method and application. BACKGROUND

[0002] In the process of petrochemical production, sudden interruption of power supply may cause explosion of part of the process equipment. When the system high-voltage power supply is interrupted for a short or long time, the high-power compressor, pump and other loads must be maintained for short-time operation at different power speeds required by the process material until safe shutdown to avoid dangerous accidents, personal injury or economic loss.

[0003] In order to deal with the short-time or long-time interruption of the system high-voltage power supply, the existing petrochemical and other industrial enterprises usually use the way of accident motor, which has the following shortcomings: an accident motor and an emergency power supply such as a high-power diesel generator or a high-power battery need to be additionally configured. However, the existing high-power diesel generator or high-power battery cannot operate in variable speed mode, the selection of accident motor is very limited, and additional investment and land area are also increased.

[0004] Based on this technical background, the present application researches a variable-voltage variable-frequency emergency power supply device and method and application. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a variable-voltage variable-frequency emergency power supply device and method and application. The device cooperates with the high-voltage power supply opening and closing device, the energy storage power supply module and the charging module to effectively deal with the problem of voltage short-time or long-time interruption in high-risk industries such as petrochemical industry, and has the advantages of good stability, high reliability, high efficiency, low investment and small land area.

[0006] In order to achieve the above purpose, the first aspect of the present application provides a variable-voltage variable-frequency emergency power supply device, comprising:

[0007] A high-voltage power supply opening and closing device is used to connect or disconnect the electrical connection between the high-voltage power supply and the load.

[0008] An energy storage power supply module comprises an energy storage device, an inverter unit and a transformer connected in sequence, and the other end of the transformer is electrically connected with the load.

[0009] A charging module comprises a charging switch and a charging device connected in sequence, the other end of the charging switch is electrically connected with a low-voltage power supply, and the other end of the charging device is electrically connected with a charging port of the energy storage device.

[0010] The second aspect of the present application provides a variable-voltage variable-frequency emergency power supply method in the above device, comprising:

[0011] When the high-voltage power supply is working normally, the high-voltage power supply disconnection device is turned on, and the high-voltage power supply is used to supply power to the load;

[0012] When the high-voltage power supply voltage is abnormal or malfunctions, the high-voltage power supply disconnection device disconnects, and the inverter unit supplies the electrical energy stored in the energy storage device to the load.

[0013] A third aspect of the present invention provides an application of the above-described apparatus in the petrochemical field.

[0014] The beneficial effects of this invention include:

[0015] (1) The variable frequency emergency power supply device proposed in this invention, through the cooperation of a high voltage power supply interruption device, an energy storage power supply module and a charging module, effectively addresses the problem of short-term or long-term voltage interruption in high-risk industries such as petrochemicals. It has the advantages of good stability, high reliability, high efficiency, low investment and small footprint.

[0016] (2) The variable frequency emergency power supply device proposed in this invention can quickly respond to short-term or long-term interruptions in power supply voltage through the control module, thereby improving work efficiency and ensuring safe operation of the device.

[0017] (3) The variable frequency emergency power supply device proposed in this invention can supply power to compressor pumps with different power and speed through the control module when the power supply fails, so as to meet various process requirements.

[0018] (4) The variable frequency emergency power supply device proposed in this invention can monitor the operating status and faults of the high voltage power supply interruption device, charging switch and inverter unit in real time through the human-machine interface, which can eliminate the safety hazards in the operation of the device in a timely manner and improve the reliability of the device.

[0019] (5) The variable frequency emergency power supply device proposed in this invention can be configured with a supercapacitor, lithium-ion battery or high power density energy storage device, which can flexibly adapt to different working conditions and time requirements.

[0020] (6) The variable frequency emergency power supply method proposed in this invention adopts a parallel power supply mode for normal power supply and energy storage power supply. During the energy storage process, the impact on the normal power supply system is minimal, and the reliability is high.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0022] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0023] Figure 1 This is a schematic diagram of the structure of the variable voltage and variable frequency emergency power supply device proposed in this invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-High voltage power supply interruption device, 2-High voltage power supply, 3-Load, 4-Energy storage power supply module, 5-Charging module, 6-Low voltage power supply, 7-Control module;

[0026] 101-Energy storage device, 102-Inverter unit, 103-Transformer, 104-Charging switch, 105-Charging device. Detailed Implementation

[0027] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0028] In this invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its normal operating state. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] This invention provides a variable voltage and variable frequency emergency power supply device, such as... Figure 1 As shown, it includes:

[0030] High-voltage power supply disconnection device 1 is used to connect or disconnect the electrical connection between high-voltage power supply 2 and load 3;

[0031] The energy storage power supply module 4 includes an energy storage device 101, an inverter unit 102 and a transformer 103 connected in sequence, with the other end of the transformer 103 being electrically connected to the load 3.

[0032] The charging module 5 includes a charging switch 104 and a charging device 105 connected in sequence. The other end of the charging switch 104 is electrically connected to a low-voltage power supply 6, and the other end of the charging device 105 is electrically connected to the charging port of the energy storage device 101.

[0033] In this invention, the high-voltage power supply interruption device, the energy storage power supply module and the charging module work together to effectively address the problems of short-term or long-term voltage interruption in high-risk industries such as petrochemicals. It has the advantages of good stability, high reliability, high efficiency, low investment and small footprint.

[0034] According to the present invention, it further includes:

[0035] The control module 7 is used to control the connection or disconnection of the high-voltage power supply interruption device 1 and the charging switch 104 respectively, and is also used to control the inverter unit 102 to supply the electrical energy stored in the energy storage device 101 to the load 3.

[0036] In this invention, the control module provides a rapid response to short-term or long-term power supply voltage interruptions, thereby improving work efficiency and ensuring the safe operation of the device.

[0037] According to the present invention, the voltage of the high-voltage power supply 2 is 6 / 10kV, and the voltage of the low-voltage power supply 6 is 0.38kV;

[0038] The inverter unit 102 has a bidirectional inverter function, and its power device is an IGBT device, which is used to invert the DC power of the energy storage device 101 into AC power and to provide the power and speed required by the process to the load 3.

[0039] Transformer 103 is a pure copper or enameled aluminum transformer with an insulation class of H, used for voltage conversion and isolation.

[0040] Preferably, the energy storage device 101 is at least one of a supercapacitor, a lithium-ion battery, and a high-power-density energy storage device;

[0041] The charging device 105 is used to charge the energy storage device 101 using the low-voltage power supply 6. The charging process includes constant current charging and constant voltage charging.

[0042] In this invention, when the power supply fails, the control module supplies power to compressor pumps and other loads at different power and speeds to meet various process requirements.

[0043] In this invention, the energy storage unit can be configured as a supercapacitor, a lithium-ion battery, or a high-power-density energy storage device, which can flexibly adapt to different operating conditions and time requirements.

[0044] According to the present invention, the control module 7 is provided with control software, a communication unit, an RS232 / RS485 interface, an Ethernet interface, a dry contact and a human-machine interface;

[0045] Optional control module 7 can be electrically connected to the DCS control system for remote data communication and alarm functions;

[0046] The human-machine interface is used to view the operating status of the entire system in real time. The operating status includes: the operating status and faults of the high-voltage power supply interruption device 1, the charging switch 104 and the inverter unit 102, and the energy storage status of the energy storage device 101.

[0047] In this invention, the operating status and faults of the high-voltage power supply interruption device, charging switch and inverter unit can be viewed in real time through the human-machine interface, which can eliminate potential safety hazards in the operation of the device in a timely manner and improve the reliability of the device.

[0048] The present invention also provides a method for supplying emergency power to a variable-frequency power supply in the described apparatus, characterized in that it includes:

[0049] When the high-voltage power supply 2 is working normally, the high-voltage power supply disconnection device 1 is connected, and the high-voltage power supply 2 is used to supply power to the load 3.

[0050] When the voltage of the high-voltage power supply 2 is abnormal or malfunctions, the high-voltage power supply interruption device 1 disconnects, and the inverter unit 102 supplies the electrical energy stored in the energy storage device 101 to the load 3.

[0051] According to the present invention, it further includes:

[0052] When the charging switch 104 is turned on, the low-voltage power supply 6 charges the energy storage device 101 through the charging device 105.

[0053] Inverter unit 102 supplies power to load 3 by providing electrical energy stored in energy storage device 101, including:

[0054] The DC power stored in the energy storage device 101 is converted into AC power by the inverter unit 102 and then stepped up by the transformer 103 to supply power to the load 3.

[0055] Preferably, the voltage obtained by transformer 103 stepping up the voltage is 6 / 10kV;

[0056] The charging process consists of constant current charging and constant voltage charging.

[0057] According to the present invention, the connection or disconnection of the high-voltage power supply interruption device 1 and the charging switch 104, and the supply of electrical energy stored in the energy storage device 101 to the load 3 by the inverter unit 102 are all controlled by the control module 7.

[0058] In this invention, the normal power supply and energy storage power supply adopt a parallel power supply method, which has little impact on the normal power supply system during the energy storage process and has high reliability.

[0059] The present invention also provides an application of the above-described device in the petrochemical field.

[0060] The present invention will now be described in more detail through a specific embodiment.

[0061] Example 1

[0062] like Figure 1 This embodiment provides a variable voltage and variable frequency emergency power supply device, including:

[0063] High-voltage power supply disconnection device 1 is used to connect or disconnect the electrical connection between high-voltage power supply 2 and load 3;

[0064] The energy storage power supply module 4 includes an energy storage device 101, an inverter unit 102 and a transformer 103 connected in sequence, with the other end of the transformer 103 being electrically connected to the load 3.

[0065] The charging module 5 includes a charging switch 104 and a charging device 105 connected in sequence. The other end of the charging switch 104 is electrically connected to a low-voltage power supply 6, and the other end of the charging device 105 is electrically connected to the charging port of the energy storage device 101.

[0066] The control module 7 is used to control the connection or disconnection of the high voltage power supply interruption device 1 and the charging switch 104 respectively, and is also used to control the inverter unit 102 to supply the electrical energy stored in the energy storage device 101 to the load 3.

[0067] In this embodiment, the voltage of the high-voltage power supply 2 is 6 / 10kV, and the voltage of the low-voltage power supply 6 is 0.38kV;

[0068] The inverter unit 102 has a bidirectional inverter function, and its power device is an IGBT device, which is used to invert the DC power of the energy storage device 101 into AC power and to provide the power and speed required by the process to the load 3.

[0069] Transformer 103 is a pure copper or enameled aluminum transformer with an insulation class of H, used for voltage conversion and isolation.

[0070] Energy storage device 101 is a supercapacitor;

[0071] The charging device 105 is used to charge the energy storage device 101 using the low-voltage power supply 6. The charging process includes constant current charging and constant voltage charging.

[0072] In this embodiment, the control module 7 is equipped with control software, a communication unit, an RS232 / RS485 interface, an Ethernet interface, dry contacts, and a human-machine interface;

[0073] Optional control module 7 can be electrically connected to the DCS control system for remote data communication and alarm functions;

[0074] The human-machine interface is used to view the operating status of the entire system in real time. The operating status includes: the operating status and faults of the high-voltage power supply interruption device 1, the charging switch 104 and the inverter unit 102, and the energy storage status of the energy storage device 101.

[0075] This embodiment provides a method for supplying power to a variable voltage and variable frequency emergency power supply device, including:

[0076] When the high-voltage power supply 2 is working normally, the high-voltage power supply disconnection device 1 is connected, and the high-voltage power supply 2 is used to supply power to the load 3.

[0077] When the voltage of the high-voltage power supply 2 is abnormal or there is a fault, the high-voltage power supply interruption device 1 disconnects, and the DC power stored in the energy storage device 101 is converted into AC power by the inverter unit 102 and then stepped up by the transformer 103 to supply power to the load 3.

[0078] When the charging switch 104 is turned on, the low-voltage power supply 6 charges the energy storage device 101 through the charging device 105.

[0079] The voltage obtained by transformer 103 step-up is 6 / 10kV;

[0080] The charging process includes constant current charging and constant voltage charging in sequence.

[0081] In this embodiment, the connection or disconnection of the high-voltage power supply interruption device 1 and the charging switch 104, and the supply of electrical energy stored in the energy storage device 101 to the load 3 by the inverter unit 102 are all controlled by the control module 7.

[0082] The variable frequency emergency power supply device proposed in this embodiment effectively addresses the problems of short-term or long-term voltage interruption in high-risk industries such as petrochemicals by working in conjunction with a high-voltage power supply interruption device, an energy storage power supply module, and a charging module. It has the advantages of good stability, high reliability, high efficiency, low investment, and small footprint.

[0083] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A variable voltage and variable frequency emergency power supply device, characterized in that, include: A high-voltage power supply disconnection device (1) is used to connect or disconnect the high-voltage power supply (2) from the load (3); The energy storage power supply module (4) includes an energy storage device (101), an inverter unit (102) and a transformer (103) connected in sequence, with the other end of the transformer (103) being electrically connected to the load (3); The charging module (5) includes a charging switch (104) and a charging device (105) connected in sequence. The other end of the charging switch (104) is electrically connected to a low-voltage power supply (6), and the other end of the charging device (105) is electrically connected to the charging port of the energy storage device (101).

2. The apparatus according to claim 1, characterized in that, Also includes: The control module (7) is used to control the connection or disconnection of the high voltage power supply switching device (1) and the charging switch (104) respectively, and is also used to control the inverter unit (102) to supply the electrical energy stored in the energy storage device (101) to the load (3).

3. The apparatus according to claim 2, characterized in that, The voltage of the high-voltage power supply (2) is 6 / 10kV, and the voltage of the low-voltage power supply (6) is 0.38kV; The inverter unit (102) has a bidirectional inverter function, and its power device is an IGBT device, which is used to invert the DC power of the energy storage device (101) into AC power and to provide the power and speed required by the process to the load (3). The transformer (103) is a pure copper or enameled aluminum transformer with an insulation class of H, used for voltage conversion and isolation.

4. The apparatus according to claim 3, characterized in that, The energy storage device (101) is at least one of a supercapacitor, a lithium-ion battery, and a high power density energy storage device; The charging device (105) is used to charge the energy storage device (101) using the low-voltage power supply (6), and the charging includes constant current charging and constant voltage charging in sequence.

5. The apparatus according to claim 4, characterized in that, The control module (7) is equipped with control software, a communication unit, an RS232 / RS485 interface, an Ethernet interface, dry contacts, and a human-machine interface; The control module (7) may optionally be electrically connected to the DCS control system for remote data communication and alarm; The human-machine interface is used to view the operating status of the entire system in real time. The operating status includes the operating status and faults of the high-voltage power supply interruption device (1), the charging switch (104) and the inverter unit (102); and the energy storage status of the energy storage device (101).

6. A method for supplying emergency power to a variable-voltage, variable-frequency power supply in the apparatus described in any one of claims 1-5, characterized in that, include:, When the high-voltage power supply (2) is working normally, the high-voltage power supply disconnection device (1) is connected, and the high-voltage power supply (2) is used to supply power to the load (3); When the voltage of the high-voltage power supply (2) is abnormal or malfunctions, the high-voltage power supply interruption device (1) disconnects, and the inverter unit (102) supplies the electrical energy stored in the energy storage device (101) to the load (3).

7. The method according to claim 6, characterized in that, Also includes: When the charging switch (104) is turned on, the low-voltage power supply (6) charges the energy storage device (101) through the charging device (105); The inverter unit (102) supplies the electrical energy stored in the energy storage device (101) to the load (3) by providing power, including: The DC power stored in the energy storage device (101) is converted into AC power by the inverter unit (102) and then stepped up by the transformer (103) to supply power to the load (3).

8. The method according to claim 7, characterized in that, The voltage obtained by the transformer (103) stepping up the voltage is 6 / 10kV; The charging process includes constant current charging and constant voltage charging in sequence.

9. The method according to claim 8, characterized in that, The connection or disconnection of the high-voltage power supply interruption device (1) and the charging switch (104), and the supply of power from the energy storage device (101) to the load (3) by the inverter unit (102) are all controlled by the control module (7).

10. The application of the apparatus according to any one of claims 1-5 in the petrochemical field.

Images