CN213461564U

CN213461564U - DC inverter

Info

Publication number: CN213461564U
Application number: CN202022706548.1U
Authority: CN
Inventors: 赵国亚; 梁勇; 李阳; 郑蕾; 李宏博
Original assignee: Jialing River Tingzikou Water Resources And Hydropower Development Co ltd
Current assignee: Jialing River Tingzikou Water Resources And Hydropower Development Co ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-06-15
Anticipated expiration: 2030-11-20

Abstract

The utility model discloses a direct current invertion power supply has solved current direct current invertion power supply and has had when alternating current power supply line loses the electricity, and the contravariant module can not normally switch over to contravariant return circuit power supply, leads to the whole electricity losses of power consumption load, and the power supply is unreliable, still can damage the technical problem of contravariant module, the utility model discloses an alternating current power supply line, direct current contravariant power supply line and maintenance bypass, direct current contravariant power supply line, alternating current power supply line are connected with static change over switch after connecting in parallel, the maintenance bypass with alternating current power supply line is parallelly connected, just the maintenance bypass connect in static change over switch's both sides. The utility model has the advantages of the reliability of power supply is high, the operation blind area has been eliminated.

Description

DC inverter

Technical Field

The utility model relates to a power supply technical field specifically is a direct current inverter.

Background

The original direct current inverter power supply is a parallel redundant power supply system formed by 6 inverter modules, each inverter module is provided with two paths of power supply inputs, one path of power supply is led from a direct current power supply of the direct current system, the other path of power supply is led from a station-service 400V power supply, the power supply is supplied by an alternating current bypass under normal conditions, and when the bypass power supply is interrupted, the direct current inverter power supply is switched to, so that the uninterrupted power supply of equipment is ensured. The main power supply objects are a computer monitoring system, a fire control system, a secondary security and protection, a scheduling data network, a unit state monitoring network cabinet, an electric energy acquisition system, a factory building network device and the like. The DC inverter power supply adopts 6 modules to form a high-reliability parallel redundancy system. And a connection mode that an alternating current bypass and a direct current inversion are mutually standby is adopted, and 25 220V alternating current feeder circuits are output in total.

As shown in fig. 1, the existing single-phase power supply system is formed by connecting 6 inverter modules in parallel, wherein one power supply of each module is input by a direct current power supply of a direct current system, so that the total capacity of the system is 6 times of the capacity of a single inverter module, and the power supply capacity of the system is greatly increased. And the other auxiliary 400V power supply is introduced into the bypass input end of the inverter module, so that the power supply system can switch the alternating current output of the system between the inverter voltage and the commercial power according to the requirement and the actual running condition of the system, and the uninterrupted power supply of the power load is ensured to the greatest extent. That is to say, the alternating current output end of the inversion module can be supplied to the load by service voltage or high-quality inversion voltage. In addition, if one or more modules have faults, the modules are only required to be pulled out and replaced by new modules, the system output does not need to be powered off, and the interruption of load power supply is avoided. During normal operation, the direct current input power switch 1Q1, the bypass alternating current input power switch 2Q1, the inverter module alternating current input power switch 2Q2 and the alternating current output power switch 3Q1 are in a closed state, and the maintenance bypass switch 4Q1 is in an open state. When the bypass alternating current power supply is interrupted, the direct current inversion power supply is automatically switched to ensure that the equipment power supply is uninterrupted.

Only when all the inverter power supply modules have faults or the alternating current input bus and the direct current input bus have faults, the 4Q1 is closed when the inverter power supply modules need to be withdrawn from maintenance, the alternating current output switch 3Q1 is required to be in an off state before the 4Q1 is closed, the 1Q1 and the 2Q2 are sequentially opened after the 4Q1 is closed, and at the moment, the inverter power supply modules, the alternating current input bus and the direct current input bus can be maintained. After the maintenance is finished, when the inversion module is put into operation again, 2Q2 and 1Q1 are switched on in sequence, then 4Q1 is switched off, and finally 3Q1 is switched on, and at the moment, the inversion module is put into operation of the system again.

Although the existing direct current inverter power supply has many advantages, the following disadvantages exist at the same time:

(1) in the normal switching process of the station service, when an alternating current bypass of a direct current inverter power supply system loses power, a detection element in an inverter module cannot accurately judge that an alternating current power supply disappears, a switching signal from alternating current to direct current is not sent, so that silicon controlled rectifier in a direct current loop cannot be conducted, the inverter module cannot be normally switched to the inverter loop to supply power, so that all power loads lose power, and a plurality of events of inverter module damage occur.

(2) Because the design is unreasonable in the early stage of operation, the direct current inverter power supply has no monitoring signal and has an operation blind area, and when an abnormal condition occurs, no alarm signal exists, so that the cost of operation, maintenance manpower and material resources is increased.

Therefore, in order to overcome the above disadvantages, it is necessary to improve the existing dc inverter power supply system in which a plurality of inverter modules are connected in parallel to form a redundant power supply system.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: when an alternating current power supply line of an existing direct current inverter power supply loses power, an inverter module cannot be normally switched to an inverter loop to supply power, so that all power loads lose power, the power supply is unreliable, and the inverter module can be damaged.

The utility model provides a solve a direct current invertion power supply of above-mentioned problem.

The utility model discloses a following technical scheme realizes:

a direct-current inverter power supply comprises an alternating-current power supply line, a direct-current inverter power supply line and a maintenance bypass, wherein the direct-current inverter power supply line and the alternating-current power supply line are connected in parallel and then connected with a static selector switch, the maintenance bypass is connected with the alternating-current power supply line in parallel, and the maintenance bypass is connected to two sides of the static selector switch.

The utility model discloses with direct current contravariant power supply line and alternating current power supply line, maintenance bypass separately, the return circuit is more clear, what adopt moreover between alternating current power supply and direct current contravariant power supply is that static change over switch connects, is a contactless switch, can realize zero time conversion, and when direct current contravariant power supply goes wrong, static change over switch can found the horse and switch to alternating current power supply, has guaranteed the reliability of power supply, and can not damage the contravariant module.

The utility model discloses preferred a direct current invertion power supply, direct current contravariant power supply line includes DC power supply, first switch and contravariant module, DC power supply connect gradually first switch with the contravariant module, the contravariant module again with static change over switch connects.

The utility model discloses preferred a direct current inverter, the alternating current power supply line includes alternating current power supply and second switch, alternating current power supply connects gradually second switch and third switch, the third switch again with static change over switch connects.

The utility model discloses preferred a direct current invertion power supply, still be provided with the transformer on the alternating current supply line, the transformer connect in between second switch and the third switch.

The utility model discloses preferred direct current invertion power supply, the one end of maintenance bypass connect in between transformer and the third switch, the other end of maintenance bypass connect in behind the static change over switch.

The utility model discloses preferred a direct current inverter, static change over switch with still be provided with the fourth switch between the link of maintenance bypass.

The utility model discloses preferred a direct current inverter, the contravariant module with be provided with the fifth switch between the static change over switch.

The utility model discloses preferred direct current inverter, be provided with the sixth switch on the maintenance bypass, the sixth switch is the BYQ switch.

The BYQ switch ensures that the inverter module of the direct-current inverter power supply can be normally switched to the maintenance bypass for supply when the inverter module fails or equipment is maintained.

The utility model discloses preferred direct current invertion power supply still includes monitoring module, monitoring module is connected with first switch, second switch, third switch, fourth switch, fifth switch, sixth switch, static change over switch and contravariant module, monitoring module and terminal equipment communication are connected.

The utility model discloses preferred direct current invertion power supply still is provided with alarm module, alarm module with monitoring module connects.

The monitoring module adopts an LCD touch screen for display, is friendly in user interface, can also monitor the running state of the system, set system running parameters and inquire current and historical alarm information in real time through the LCD, and the module sends the abnormal alarm information of the whole inverter power system to the monitoring system, thereby eliminating the running blind area and ensuring the safe and stable running of important equipment such as a dispatching automation system, a fire control system, an electric energy acquisition system and the like. The occurrence of important equipment abnormal events such as communication interruption, abnormal operation of fire-fighting equipment, abnormal electric quantity acquisition and the like is avoided.

The utility model discloses have following advantage and beneficial effect:

1) the utility model discloses part bypass and direct current contravariant power supply line, and set up static change over switch and make the invertion power supply more reliable.

2) The utility model discloses set up the BYQ switch on the other road of maintenance, when guaranteeing direct current inverter power supply system contravariant module trouble or overhaul of equipments, can normally switch to the maintenance bypass power supply.

3) The utility model discloses increase all load switches and lose electricity, contravariant module fault alarm function to independently send fault signal to computer monitoring system respectively.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic diagram of a conventional circuit in the background art of the present invention.

Fig. 2 is a schematic structural diagram of the dc inverter of the present invention.

Part names in the drawings:

the monitoring circuit comprises a 1-first switch, a 2-second switch, a 3-third switch, a 4-fourth switch, a 5-fifth switch, a 6-sixth switch, a 7-transformer, an 8-static selector switch, a 9-inversion module and a 10-monitoring module.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

As shown in fig. 2, a dc inverter power supply includes an ac power supply line, a dc inverter power supply line, and a maintenance bypass, the dc inverter power supply line and the ac power supply line are connected in parallel and then connected to a static transfer switch 8, the maintenance bypass is connected in parallel to the ac power supply line, and the maintenance bypass is connected to both sides of the static transfer switch 8.

The direct current inversion power supply line comprises a direct current power supply, a first switch 1 and an inversion module 9, the direct current power supply is sequentially connected with the first switch 1 and the inversion module 9, and the inversion module 9 is connected with the static selector switch 8.

Contravariant module 9 comprises converter, dc-to-ac converter and the control unit, and single module capacity is 2.5kVA, and total capacity is 15kVA, compares before reforming transform, and this module is lighter, and the operation is more stable, and it is simpler to change during the trouble, does not need too much setting, and daily maintenance work volume is few.

The alternating current power supply line comprises an alternating current power supply and a second switch 2, the alternating current power supply is sequentially connected with the second switch 2 and a third switch 3, and the third switch 3 is connected with the static selector switch 8.

A transformer 7 is further arranged on the alternating current supply line, and the transformer 7 is connected between the second switch 2 and the third switch 3.

One end of the maintenance bypass is connected between the transformer 7 and the third switch 3, and the other end of the maintenance bypass is connected behind the static selector switch 8.

A fourth switch 4 is also arranged between the static selector switch 8 and the connecting end of the maintenance bypass.

A fifth switch 5 is arranged between the inverter module 9 and the static selector switch 8.

And a sixth switch 6 is arranged on the maintenance bypass, and the sixth switch 6 is a BYQ switch.

The BYQ switch ensures that the inverter module 9 of the direct-current inverter power supply can be normally switched to the maintenance bypass for supply when the inverter module has a fault or the equipment is maintained.

The utility model discloses still include monitoring module 10, monitoring module 10 is connected with first switch 1, second switch 2, third switch 3, fourth switch 4, fifth switch 5, sixth switch 6, static change over switch 8 and contravariant module 9, monitoring module 10 is connected with the terminal equipment communication to increase all load switches and lose the electricity, contravariant module 9 fault alarm function, and independently send fault signal to monitoring module 10 respectively.

The monitoring module 10 is displayed by an LCD touch screen, is friendly in user interface, can monitor the running state of the system, set system running parameters and inquire current and historical alarm information in real time through the LCD, and the module sends the abnormal alarm information of the whole inverter power system to the monitoring system, so that the running blind area is eliminated, and the safe and stable running of important equipment such as a dispatching automation system, a fire control system, an electric energy acquisition system and the like is ensured. The occurrence of important equipment abnormal events such as communication interruption, abnormal operation of fire-fighting equipment, abnormal electric quantity acquisition and the like is avoided.

The utility model discloses the theory of operation of circuit does:

when the maintenance bypass is in normal operation, the first switch 1, the second switch 2, the third switch 3, the fourth switch 4 and the fifth switch 5 are in a closed state, and the sixth switch 6 of the maintenance bypass is opened; the BYQ is closed only when the static change-over switch 8 fails or the inversion module 9 fails and needs to quit maintenance, the fifth switch 5 of the output switch is ensured to be in an off state before the BYQ is closed, the fourth switch 4, the first switch 1 and the third switch 3 are sequentially opened after the BYQ is closed, and the inversion module 9 can be maintained at the moment; after the overhaul is finished, the operation sequence of putting the inversion module 9 into operation again is as follows: and sequentially closing the third switch 3, opening the BYQ after the fourth switch 4 is closed, finally closing the first switch 1, and putting the inversion module 9 into system operation again at the moment by the fifth switch 5.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A direct-current inverter power supply is characterized by comprising an alternating-current power supply line, a direct-current inverter power supply line and maintenance bypasses, wherein the direct-current inverter power supply line and the alternating-current power supply line are connected with a static selector switch (8) after being connected in parallel, the maintenance bypasses are connected with the alternating-current power supply line in parallel, and the maintenance bypasses are connected to two sides of the static selector switch (8).

2. The direct-current inverter power supply according to claim 1, wherein the direct-current inverter power supply line comprises a direct-current power supply, a first switch (1) and an inverter module (9), the direct-current power supply is sequentially connected with the first switch (1) and the inverter module (9), and the inverter module (9) is further connected with the static selector switch (8).

3. A dc-inverter as claimed in claim 1 or 2, characterized in that the ac supply line comprises an ac power source and a second switch (2), the ac power source is connected to the second switch (2) and a third switch (3) in turn, and the third switch (3) is connected to the static transfer switch (8).

4. A dc-inverter power supply according to claim 3, characterized in that a transformer (7) is arranged on the ac supply line, said transformer (7) being connected between the second switch (2) and the third switch (3).

5. A DC inverse power supply according to claim 4, characterized in that one end of the service bypass is connected between the transformer (7) and the third switch (3), and the other end of the service bypass is connected behind the static change-over switch (8).

6. A DC inverter as claimed in claim 5, characterized in that a fourth switch (4) is arranged between the static change-over switch (8) and the connection end of the service bypass.

7. A dc-inverter power supply according to claim 2, characterized in that a fifth switch (5) is arranged between the inverter module (9) and the static transfer switch (8).

8. A dc inverter as claimed in claim 1 or 2, wherein a sixth switch (6) is arranged on the maintenance bypass, and the sixth switch (6) is a BYQ switch.

9. The direct-current inverter power supply according to claim 1 or 2, further comprising a monitoring module (10), wherein the monitoring module (10) is connected with the first switch (1), the second switch (2), the third switch (3), the fourth switch (4), the fifth switch (5), the sixth switch (6), the static transfer switch (8) and the inverter module (9), and the monitoring module (10) is connected with a terminal device in a communication manner.

10. The direct-current inverter power supply according to claim 9, further comprising an alarm module, wherein the alarm module is connected with the monitoring module (10).