CN210297339U - Emergency power supply device of IT grounding system common rectifier frequency conversion device - Google Patents
Emergency power supply device of IT grounding system common rectifier frequency conversion device Download PDFInfo
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- CN210297339U CN210297339U CN201921263309.4U CN201921263309U CN210297339U CN 210297339 U CN210297339 U CN 210297339U CN 201921263309 U CN201921263309 U CN 201921263309U CN 210297339 U CN210297339 U CN 210297339U
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Abstract
An emergency power supply device of a frequency conversion device of a public rectifier of an IT grounding system belongs to the technical field of electrical control. The device comprises a charging device, a super battery energy storage unit, a DC/DC boosting voltage stabilizer, a control contactor and an IT grounding system emergency power supply device control unit; the charging device is connected with a 380V power supply through a power cable, the charging device is connected with the super battery energy storage unit through the power cable, the super battery energy storage unit is connected with the DC/DC boosting voltage stabilizer through the power cable, and the DC/DC boosting voltage stabilizer is connected with the control contactor through the power cable. The direct butt joint of the frequency conversion device which supplies power to the IT grounding system can be realized, and the composition of the electric control equipment is greatly simplified. Because the super-energy battery is adopted, the characteristics of long service life and low failure rate are utilized, the operation and maintenance cost is reduced, and the reliability of system operation is improved.
Description
Technical Field
The utility model belongs to the technical field of electrical control, in particular to IT ground system common rectifier frequency conversion device's emergent power supply unit. The device is suitable for transmission systems in the metallurgical industry or systems similar to variable frequency transmission in other industries and needing emergency power supply.
Background
Along with the development of electrical science and technology of metallurgical enterprises, the electrical variable frequency transmission system is more and more widely applied. A conventional single frequency conversion device or a smaller direct current common rectifier frequency conversion system adopts a mode of supplying power by a power transformer together with other power distribution devices, and when a power supply system fails, an emergency power supply can be provided by a diesel generator, a UPS power supply, an EPS power supply and the like. For a transmission system (hereinafter referred to as a common rectifier frequency conversion device for short) of a large common rectifier, a direct-current bus and a frequency converter, which adopts a rectifier transformer to supply power, an IT grounding system can reduce the fault rate of the system, so that the system is widely applied, but an emergency power supply is not generally arranged in the system.
The diesel generator, the UPS and the EPS are adopted as emergency power supply devices, and the problem of complex maintenance is solved. There are noise and vibrations in diesel generator operation, have very strict requirement to installation service environment, need regularly maintain the inspection in the use, need start-up the experiment during the maintenance, not only burn diesel oil and consume the energy, can release the flue gas polluted environment moreover. Although UPS power supply and EPS power supply are adopted to overcome the defects of noise, vibration, environmental pollution and the like of diesel generators, certain limitation exists in use, a charging and discharging test is needed during maintenance, and although the UPS power supply and the EPS power supply are widely applied to an automatic control system, a communication system and a fire fighting system, the UPS power supply and the EPS power supply are not applied to the power supply of an electrical transmission device of an IT grounding system at present.
If a diesel generator, a UPS power supply device and an EPS power supply device are adopted to supply power to the common rectifier frequency conversion device of the IT grounding system, an isolation transformer needs to be arranged, the TN grounding system is changed into the IT grounding system, and then the power is supplied to the common rectifier frequency conversion device, so that the defects of complex integral power supply structure, large occupied area, large loss, complex maintenance and the like exist.
Therefore, finding out an emergency power supply system suitable for the frequency conversion device of the common rectifier of the IT grounding system in the metallurgical industry is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
An object of the utility model is to provide a public rectifier frequency conversion equipment's of IT ground system emergency power supply device has solved the demand of the public rectifier frequency conversion equipment of metallurgical industry or other trades IT ground system to emergency power supply.
An emergency power supply device of an IT grounding system common rectifier frequency conversion device comprises a charging device 9, a super battery energy storage unit 10, a DC/DC boost voltage stabilizer 11, a control contactor 12 and an IT grounding system emergency power supply device control unit 13. Charging device 9 is connected with the 380V power supply through a power cable, charging device 9 and super battery energy storage unit 10 are connected through a power cable, super battery energy storage unit 10 and DC/DC step-up voltage stabilizer 11 are connected through a power cable, DC/DC step-up voltage stabilizer 11 and control contactor 12 are connected through a power cable, IT grounding system emergency power supply device control unit 13 and charging device 9, super battery energy storage unit 10 and DC/DC step-up voltage stabilizer 11 are respectively connected through Profibus-DP network cables, and are connected through a control cable with control contactor 12.
The main function is to meet the requirement that the public rectifier frequency conversion device 4 of the IT grounding system in the metallurgical industry cannot provide working voltage for the DC bus 5 of the public rectifier when the rectifier transformer 1 powered by the power supply system fails or has power failure, and any one of the rectifier transformer 1, the inlet switch 2 of the public rectifier and the public rectifier control unit 4 fails, the emergency power supply device 8 of the public rectifier frequency conversion device of the IT grounding system can provide working power supply for the DC bus 5 of the public rectifier, and then the AC motor inverter 6 is used for ensuring that the AC variable frequency motor 7 works uninterruptedly, thereby avoiding the major equipment damage and economic loss.
The using method of the device comprises the following specific steps and parameters:
1. the super battery energy storage unit 10 is charged by an external 380V power supply through the charging device 9, and the energy stored by the super battery energy storage unit 10 can meet the electric energy required by the alternating current variable frequency motor 7 when an accident is handled.
The super battery energy storage unit 10 is used as an energy storage device, but is not limited to the super battery energy storage unit 10 as an energy storage element. The super battery energy storage unit 10 has the advantages of reduced attenuation when not in operation, no need of charge and discharge tests and the like.
2. The super battery energy storage unit 10 is connected to the control contactor 12 through the DC/DC boosting voltage stabilizer 11 and then connected to the common rectifying device direct current bus 5, the voltage of the output end of the DC/DC boosting voltage stabilizer 11 can be stabilized on the working voltage required by the alternating current motor inverter 6, the direct current output voltage is ensured to be stabilized at a set value, and the set value is any value of 480 VDC-650 VDC or 700 VDC-990 VDC, so that the function of the energy storage unit is exerted to the maximum. Due to the adoption of the DC/DC boost voltage stabilizer 11, even if the energy is reduced and the output voltage is reduced along with the work of the alternating current variable frequency motor 7, the voltage of the direct current output side of the DC/DC boost voltage stabilizer 11 can be ensured to be stabilized at a set value, and the reliable work of the alternating current variable frequency motor 7 is ensured.
3. The output end of the DC/DC boost voltage stabilizer 11 is connected with the DC bus of the common rectifier frequency conversion device 5 through a control contactor 12.
4. The IT grounding system emergency power supply device control unit 13 is a core control component of an emergency power supply device 8 of an IT grounding system common rectifier frequency conversion device, realizes the overall monitoring and control of the IT grounding system emergency power supply device 8 through the communication with the charge and discharge control of the super battery energy storage unit 10, the DC/DC boost voltage stabilizer 11 and the common rectification device 4, and comprises the charge and discharge control of the super battery energy storage unit 10, the output voltage control of the DC/DC boost voltage stabilizer 11, and the closing and opening control of a control contactor 12 for switching on a common rectification device direct current bus 5; and the communication with the public rectifying device 4 and the alternating current motor inverter 6 can be realized, and the emergency power supply of the emergency power supply device 8 of the frequency conversion device of the public rectifier of the IT grounding system when the power supply system fails or the public rectifying device 4 fails can be completed together.
5. When the fact that the direct current bus 5 of the public rectifying device has no voltage or the public rectifying device 4 works abnormally is confirmed, the IT grounding system emergency power supply device control unit 13 sends a signal needing emergency power supply, the control contactor 12 of the IT grounding system emergency power supply device 8 is connected, the voltage of the direct current bus 5 of the public rectifying device frequency conversion device 3 is recovered to be normal, and at the moment, the motor inverter 6 and the alternating current frequency conversion motor 7 work normally to process emergency accidents.
The utility model has the advantages that: the control unit of the emergency power supply device of the IT grounding system can realize direct butt joint with a frequency conversion device for supplying power to the IT grounding system, and the composition of the electric control equipment is greatly simplified. Because the control unit of the emergency power supply device of the IT grounding system adopts the super-energy battery, the characteristics of long service life and low failure rate are utilized, so that the reliability and the service life of the operation of the whole system are improved, and the emergency power supply device has the characteristic of maintenance-free performance. The emergency maintenance system is in a maintenance-free state at ordinary times, maintenance work is not required to be performed on other emergency facilities as often, and only when a fault occurs, maintenance is required, so that the operation and maintenance cost is greatly reduced, and the operation reliability of the system is improved.
Drawings
Fig. 1 is a schematic diagram of an emergency power supply device of a frequency conversion device of a common rectifier of an IT grounding system. The system comprises a rectifier transformer 1, a public rectifier incoming line switch 2, a public rectifier frequency conversion device 3, a public rectifier device 4, a public rectifier direct-current bus 5, an alternating-current motor inverter 6, an alternating-current frequency conversion motor 7, an IT grounding system emergency power supply device 8, a charging device 9, a super battery energy storage unit 10, a DC/DC boosting voltage stabilizer 11, a control contactor 12 and an IT grounding system emergency power supply device control unit 13.
Detailed Description
Example 1
An emergency power supply device of an IT grounding system common rectifier frequency conversion device comprises a charging device 9, a super battery energy storage unit 10, a DC/DC boost voltage stabilizer 11, a control contactor 12 and an IT grounding system emergency power supply device control unit 13. An external 380V power supply is connected with a charging device 9 through a power cable, the charging device 9 is connected with a super battery energy storage unit 10 through a power cable, the super battery energy storage unit 10 is connected with a DC/DC boosting voltage stabilizer 11 through a power cable, the DC/DC boosting voltage stabilizer 11 is connected with a control contactor 12 through a power cable, and an IT grounding system emergency power supply device control unit 13 is connected with the charging device 9, the super battery energy storage unit 10 and the DC/DC boosting voltage stabilizer 11 through Profibus-DP network cables respectively and connected with the control contactor 12 through a control cable.
During normal production, a workshop 10kV (not limited to a 10kV system) power supply system supplies power to the rectifier transformer 1, the public rectifier incoming line switch 2 is closed, the public rectifier device 4 starts to work, the public rectifier device direct-current bus 5, the motor frequency converter 6 and the public rectifier frequency converter 3 jointly form the alternating-current variable-frequency motor 7, and control of starting and stopping of the motor, speed regulation under different working conditions and the like is achieved.
When the emergency power supply device 8 of the common rectifier frequency conversion device of the IT grounding system is normally produced, the emergency power supply device is in a standby state. The 380V alternating current power supply IT grounding system emergency power supply device control unit 13 can detect the output end voltage of the super battery energy storage unit 10 at any time. The energy stored in the super cell energy storage unit 10 is a range with a maximum voltage of 650V and typically has very little attenuation over long periods of time, and can be monitored from time to time and only needs to be charged if the stored energy is below 580V. Therefore, the charging device can be fixed or movable and is very flexible.
When the common rectifier device direct current bus 5 is determined to have no voltage or the common rectifier device 4 works abnormally, the IT grounding system emergency power supply device control unit 13 sends out a signal needing emergency power supply, a control contactor 12 of the emergency power supply device 8 of the IT grounding system common rectifier frequency conversion device is connected, the voltage of the direct current bus 5 of the common rectifier frequency conversion device 3 is recovered to be normal, and at the moment, the motor inverter 6 and the alternating current frequency conversion motor 7 can work normally to process emergency accidents.
The voltage in the super battery energy storage unit 10 of the DC/DC boost voltage stabilizer 11 is boosted to the working voltage 650VDC determined by the inverter alternating current motor inverter 6, so as to play the role of the super battery energy storage unit 10 to the maximum extent.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that modifications may be made to the details of the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (1)
1. An emergency power supply device of an IT grounding system common rectifier frequency conversion device is characterized by comprising a charging device (9), a super battery energy storage unit (10), a DC/DC boost voltage stabilizer (11), a control contactor (12) and an IT grounding system emergency power supply device control unit (13); the charging device (9) is connected with a 380V power supply through a power cable, the charging device (9) is connected with the super battery energy storage unit (10) through the power cable, the super battery energy storage unit (10) is connected with the DC/DC boosting voltage stabilizer (11) through the power cable, the DC/DC boosting voltage stabilizer (11) is connected with the control contactor (12) through the power cable, and the IT grounding system emergency power supply device control unit (13) is connected with the charging device (9), the super battery energy storage unit (10) and the DC/DC boosting voltage stabilizer (11) through Profibus-DP network cables respectively and connected with the control contactor (12) through the control cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921263309.4U CN210297339U (en) | 2019-08-06 | 2019-08-06 | Emergency power supply device of IT grounding system common rectifier frequency conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921263309.4U CN210297339U (en) | 2019-08-06 | 2019-08-06 | Emergency power supply device of IT grounding system common rectifier frequency conversion device |
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| Publication Number | Publication Date |
|---|---|
| CN210297339U true CN210297339U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921263309.4U Active CN210297339U (en) | 2019-08-06 | 2019-08-06 | Emergency power supply device of IT grounding system common rectifier frequency conversion device |
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| Country | Link |
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| CN (1) | CN210297339U (en) |
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2019
- 2019-08-06 CN CN201921263309.4U patent/CN210297339U/en active Active
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