UPS (Uninterrupted Power Supply) backup power supply device and method suitable for single direct-current power supply system of power distribution station house

Abstract

The invention provides a UPS backup power supply device and method suitable for a single direct current power supply system of a power distribution station house. The device comprises a power supply detection module, a UPS module, a switching control module and a UPS management module. The power supply detection module, the UPS power supply module and the switching control module are connected through a voltage power line; the UPS management module is connected with the UPS power supply module through an RS485 communication line or in a wireless 4G communication mode, and the switching control module is connected with a power distribution station load through a power line. The whole device is portable and movable, and when the device arrives at a power distribution station house, the UPS power supply module replaces a power distribution station house single direct current power supply system; and the UPS power supply module is used for supplying power to a load of the power distribution station house. By adopting the UPS, the power supply requirement of the direct current system can be met under the normal state of the power distribution station house, and the normal operation of the protection system under the sudden accident of the power distribution station house can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply for distribution substations, and particularly to a backup power supply device and method applicable to a single DC power supply system in distribution substations. Background Art

[0002] Distribution substations are key facilities in the power system, and their stable operation is crucial for the reliability of power supply. Single DC power supply systems are widely used in distribution substations. However, during power supply failures or power source detections, power supply interruptions may occur, affecting the normal operation of protection systems. Existing UPS power supply systems are mostly applicable to AC power systems and have poor adaptability to single DC power supply systems, with certain limitations.

[0003] Therefore, in view of the advantages of single DC power supply systems and UPS power supply systems in distribution substations, it is necessary to study a backup power supply guarantee technology applicable to single DC power supply systems in distribution substations to solve the problem of unstable power supply in existing technologies during power supply failures or power source detections in single DC power supply systems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a backup power supply device and method applicable to a single DC power supply system in a distribution substation.

[0005] To solve the above problems, a backup power supply device applicable to a single DC power supply system in a distribution substation of the present invention includes a power source detection module, a UPS power supply module, a switching control module, and a UPS management module; the power source detection module, the UPS power supply module, and the switching control module are connected by voltage power lines; a UPS management module is provided, and the UPS management module is connected to the UPS power supply module through an RS485 communication line or a wireless 4G communication method, and the switching control module is connected to the distribution substation load through a power line.

[0006] The power source detection module includes an input power supply monitoring unit and a switch control signal unit.

[0007] The UPS power supply module includes a filtering unit, a rectifying unit, a voltage regulating unit, and an energy storage battery unit. The filtering unit is connected to the rectifying unit through a fuse, the rectifying unit is connected to the voltage regulating unit through a power line, the voltage regulating unit is connected to the energy storage battery unit through a power line, the energy storage battery unit is connected to the switching control module through a power line, the energy storage battery unit includes a battery monitoring sub-unit, a battery module, a heat dissipation management sub-unit, and a charge and discharge management sub-unit, the battery monitoring sub-unit is connected to the battery module through a control cable, the battery module is connected to the heat dissipation management sub-unit through a control cable, the battery module is connected to the charge and discharge management sub-unit through a power cable, and the charge and discharge management sub-unit is connected to the switching control module through a power cable.

[0008] The switching control module includes a switch switching unit and a voltage stabilizing unit.

[0009] The UPS management module consists of a mobile terminal equipped with an RS485 interface or a wireless 4G communication module, and includes an application program for managing the UPS power module.

[0010] An online monitoring method for a UPS power backup power supply device applicable to a single DC power supply system in a substation building, adopting one of the above, includes the following steps: (1) The power detection module, the UPS power module, and the switching control module are connected by a voltage power line, and the UPS management module is connected to the UPS power module by RS485 communication or wireless 4G communication, and installed in a portable trolley case to form a portable backup power supply system; (2) Connect the input end of the UPS power module to the AC 220V power supply interface to charge the energy storage battery in the UPS power module; (3) To improve the energy storage life, stop charging when the energy storage charging reaches 80%. After charging is completed, move the entire device to the substation building and replace the single DC power supply system in the substation building with the UPS power module; (4) During the maintenance of the DC power supply system in the substation building, the UPS power module supplies power to the loads in the substation building; (5) The power detection module is connected to the input end of the single DC power supply system to detect the input power status of the single DC power supply system in real time. If the input power status is in an accident power outage, the switching control module controls the energy storage battery to discharge and supply power to the loads in the substation building; (6) The UPS management module monitors the operation status of the UPS power module in real time. If the data of the UPS power backup power supply device is abnormal, it receives an alarm message; (7) The device user processes the abnormal problems of the UPS power backup power supply device in a timely manner according to the alarm message of the UPS management module; (8) When the DC system power supply is restored, disconnect the wiring between the switching control module and the substation building load to end the power supply.

[0011] The present invention has the following advantages compared with the prior art: 1. The present invention integrates the power detection module, the UPS power module, the switching control module, and the UPS management module into a complete set of portable backup power supply systems, which can solve the problem that the protection system of the substation building cannot supply power when a fault occurs in the DC system or a detection charge and discharge test is performed in the single DC power supply system of the substation building. At the same time, it solves the problem that the existing UPS power supply is only applicable to the AC system, improves the applicability of the device, and ensures the safe operation of the substation building during the maintenance state.

[0012] 2. The present invention can achieve dual protection control of the system through the switching control module, reduce the impact of power outages in the substation on the system, provide stable and uninterrupted power supply, and ensure the uninterrupted operation of the system.

[0013] 3. The present invention uses the UPS management module to achieve online monitoring of the UPS power module. When the UPS power module shows abnormalities, the system will send warning messages to help the users handle problems in a timely manner, thereby enhancing the safety of the equipment.

[0014] 4. The present invention uses a UPS power supply, which is conducive to increasing the service life of energy storage. The UPS power supply can not only meet the power supply requirements of the DC system under normal conditions in the substation, but also ensure the normal operation of the protection system in case of emergencies in the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further elaborates on the specific embodiments of the present invention with reference to the drawings.

[0016] Figure 1 It is the external structure diagram of the present invention.

[0017] Figure 2 It is the overall internal schematic diagram of the present invention.

[0018] Figure 3 It is the schematic diagram of the UPS power module of the present invention.

[0019] Figure 4 It is the schematic diagram of the energy storage battery unit of the present invention.

[0020] Figure 5 It is the flow chart of the present invention. SPECIFIC EMBODIMENTS

[0021] As shown in the figure, a backup power supply device and method applicable to a single DC power supply system in a substation. The device includes a power detection module 1, a UPS power module 2, a switching control module 3, and a UPS management module 4; the power detection module 1, the UPS power module 2 are connected to the switching control module 3 through voltage power lines; the UPS management module 4 is connected to the UPS power module 2 through an RS485 communication line or a wireless 4G communication method, and the switching control module 3 is connected to the substation load through a power line.

[0022] The power detection module 1 includes an input power monitoring unit and a switch control signal unit, which are used to detect the voltage and current of the input power in real time and judge the power state.

[0023] The UPS power supply module 2 includes a filtering unit 21, a rectifying unit 22, a voltage regulating unit 23, and an energy storage battery unit 24. The filtering unit 21 is connected to the rectifying unit 22 via a fuse. The rectifying unit 22 is connected to the voltage regulating unit 23 via a power line. The voltage regulating unit 23 is connected to the energy storage battery unit 24 via a power line. The energy storage battery unit 24 is connected to the switching control module via a power line. The energy storage battery unit includes an energy storage battery monitoring sub-unit 241, an energy storage battery module 242, a heat dissipation management sub-unit 243, and an energy storage charge and discharge management sub-unit 244, which is used to provide a backup power supply in case of a main power failure, has functions of electric energy storage, charge and discharge management, and monitoring of the operating parameters of the battery module, and can output a stable DC voltage to supply power to the load of the substation building. The battery monitoring sub-unit 241 is connected to the battery module 242 via a control cable. The battery module 242 is connected to the heat dissipation management sub-unit 243 via a control cable. The battery module 242 is connected to the charge and discharge management sub-unit 244 via a power cable. The charge and discharge management sub-unit 244 is connected to the switching control module via a power cable The switching control module 3 includes a switch switching unit and a voltage stabilizing unit, which is used to automatically switch to the power supply of the UPS power supply module in case of a main power failure.

[0024] The UPS management module 4 consists of a mobile terminal equipped with an RS485 interface or a wireless 4G communication module, and includes an application program for the management of the UPS power supply module, which can monitor the operating status of each part of the UPS power supply module in real time. If the data of the UPS power supply system is abnormal, it will receive an alarm message to guide the on-site personnel to promptly handle the abnormal problems of the UPS power supply module and ensure the safe operation of the entire system.

[0025] As Figure 5 shown, an on-line monitoring method for a backup power supply device applicable to a single DC power supply system in a substation building includes the following steps: (1) The power detection module, the UPS power supply module, and the switching control module are connected by a voltage power line. The UPS management module is connected to the UPS power supply module by RS485 communication or wireless 4G communication, and installed in a portable trolley case (as Figure 1 shown) to form a portable backup power supply system; (2) Connect the input end of the UPS power supply module to the AC 220V power interface to charge the energy storage battery in the UPS power supply module; (3) To improve the energy storage life, stop charging when the energy storage reaches 80%. After charging is completed, move the entire device to the substation building and replace the single DC power supply system in the substation building with the UPS power supply module; (4) During the maintenance of the DC power supply system in the substation building, the UPS power supply module supplies power to the load of the substation building; (5) The power supply detection module is connected to the input end of the single DC power supply system to detect the input power supply status of the single DC power supply system in real time. If the input power supply status is in an accident power outage, the switching control module controls the energy storage battery to discharge and supply power to the load in the substation building. (6) The UPS management module monitors the operating status of the UPS power supply module in real time. If the data of the UPS power supply backup power supply device is abnormal, it receives an alarm message. (7) The device user timely completes the handling of the abnormal problems of the UPS power supply backup power supply device according to the alarm message of the UPS management module. (8) When the power supply of the DC system is restored, disconnect the wiring between the switching control module and the building load to end the power supply.

Claims

1. A UPS power supply backup power supply device applicable to a single DC power supply system in a distribution substation room, characterized in that: The device includes a power detection module (1), a UPS power module (2), a switching control module (3), and a UPS management module (4); the power detection module (1), the UPS power module (2) and the switching control module (3) are connected by voltage power lines; the UPS management module (4) is connected to the UPS power module (2) through an RS485 communication line or a wireless 4G communication method, and the switching control module (3) is connected to the distribution substation load through a power line.

2. The UPS power supply backup power supply device applicable to the single DC power supply system of the distribution substation room according to claim 1, characterized in that: The power detection module (1) includes an input power monitoring unit and a switch control signal unit.

3. The UPS power backup power supply device applicable to the single DC power supply system of the distribution substation room according to claim 1, characterized in that: The UPS power module (2) includes a filtering unit (21), a rectifying unit (22), a voltage regulating unit (23), and an energy storage battery unit (24). The filtering unit (21) is connected to the rectifying unit (22) through a fuse. The rectifying unit (22) is connected to the voltage regulating unit (23) through a power line. The voltage regulating unit (23) is connected to the energy storage battery unit (24) through a power line. The energy storage battery unit (24) is connected to the switching control module through a power line. The energy storage battery unit includes a battery monitoring subunit (241), a battery module (242), a heat dissipation management subunit (243), and a charge and discharge management subunit (244). The battery monitoring subunit (241) is connected to the battery module (242) through a control cable. The battery module (242) is connected to the heat dissipation management subunit (243) through a control cable. The battery module (242) is connected to the charge and discharge management subunit (244) through a power cable. The charge and discharge management subunit (244) is connected to the switching control module through a power cable.

4. The UPS power supply backup power supply device applicable to the single DC power supply system of the distribution substation room as described in claim 1, characterized in that: The switching control module (3) includes a switch switching unit and a voltage stabilizing unit.

5. The UPS power supply backup power supply device applicable to the single DC power supply system of the distribution substation room according to claim 1, characterized in that: The UPS management module (4) consists of a mobile terminal equipped with an RS485 interface or a wireless 4G communication module and includes an application program for managing the UPS power module.

6. An online monitoring method for a UPS power backup power supply device as claimed in any one of claims 1 to 5, comprising the following steps:

1. The power detection module (1), the UPS power module (2), and the switching control module are connected by voltage power lines. The UPS management module (4) is connected to the UPS power module (2) through RS485 communication or a wireless 4G communication method to achieve signal transmission, and is installed in a portable trolley case to form a portable backup power supply system; 2. Connect the input end of the UPS power module (2) to an AC 220V power supply interface to charge the energy storage battery in the UPS power module (2); 3. To improve the energy storage life, stop charging when the energy storage charge reaches 80%. After charging is completed, move the entire device to the distribution substation building and replace the single DC power supply system in the distribution substation building with the UPS power module; 4. During the maintenance of the DC power supply system in the distribution substation building, the UPS power module supplies power to the load in the distribution substation building; 5. The power detection module (1) is connected to the input end of the single DC power supply system to continuously detect the input power status of the single DC power supply system. If the input power status is in an accident power outage, the switching control module (3) controls the energy storage battery to discharge and supply power to the load in the distribution substation building; 6. The UPS management module (4) monitors the operating status of the UPS power module (2) in real time. If the data of the UPS power backup power supply device is abnormal, it receives an alarm message.

7. The device user completes the handling of the abnormal problems of the UPS power backup power supply device in a timely manner according to the alarm message of the UPS management module (4).

8. When the DC system power supply is restored, disconnect the wiring between the switching control module (3) and the substation load to end the power supply.

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