CN211089218U - High-capacity high-reliability rapid power supply switching device - Google Patents
High-capacity high-reliability rapid power supply switching device Download PDFInfo
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- CN211089218U CN211089218U CN201921039428.1U CN201921039428U CN211089218U CN 211089218 U CN211089218 U CN 211089218U CN 201921039428 U CN201921039428 U CN 201921039428U CN 211089218 U CN211089218 U CN 211089218U
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Abstract
The utility model discloses a high reliable quick power switching device of large capacity, including power side 1 and female switch that allies oneself with, power side 1 is the dual power supply mode of two way alternating current power inlet wires, and the generating line of the first way power inlet wire is connected with the generating line of second way power inlet wire through female switch that allies oneself with, and key load articulates on the third generating line, and the third generating line is connected through the generating line of transmission of electricity way 1 with the first way power inlet wire, and the third generating line still is connected through the generating line of transmission of electricity way 2 with the second way power inlet wire. The power transmission path 1 and the power transmission path 2 are used for connecting or disconnecting a current path of a critical load. The power transmission path 1, the power transmission path 2 and the bus coupler switch are respectively connected with the controller, and the on-off of the power transmission path 1, the power transmission path 2 and the bus coupler switch is controlled by the controller. When the power supply on one side fails, the power supply on the other side can still supply power to the critical load and the secondary load, the response time is short, the continuity is good, and the normal operation of the critical load is not influenced.
Description
Technical Field
The utility model relates to an automatic switching technical field of electric power system power transmission and distribution, in particular to high reliable quick power switching device of large capacity.
Background
In many power utilization occasions, equipment needing stable power supply and continuous power supply exists, so that important equipment is often powered by double power supplies, and when a power supply on one side fails, a power supply on the other side supplies power to a load. However, the dual power supply system has problems such as long switching time, poor continuity and stability of load voltage, and the like, for example, when the conventional mechanical circuit breaker needs to be disconnected, the response speed is slow, an arc is easily generated, and discontinuity of voltage of the electric equipment is caused.
Disclosure of Invention
In order to solve the above problem, the utility model discloses a following technical scheme realizes:
a high-capacity high-reliability fast power supply switching device comprises a power supply side 1 and a bus coupler switch, wherein the power supply side 1 is in a dual power supply mode of two paths of alternating current power supply incoming lines, a bus of a first path of power supply incoming line is connected with a bus of a second path of power supply incoming line through the bus coupler switch, a key load is connected to a third bus in a hanging mode, the third bus is connected with the bus of the first path of power supply incoming line through a power transmission path 1, and the third bus is also connected with the bus of the second path of power supply incoming line through a power transmission path 2;
the power transmission path 1 and the power transmission path 2 are used for connecting or disconnecting a current path of a key load;
the power transmission path 1, the power transmission path 2 and the bus coupler switch are respectively connected with the controller, and the on-off of the power transmission path 1, the power transmission path 2 and the bus coupler switch is controlled through the controller.
Preferably, the bus-coupled switch is formed by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then merging the diode rectifier bridge and the full-control power device IGBT into an RCD absorption circuit.
Preferably, the power transmission path 1 and the power transmission path 2 have the same internal structure;
said transmission path 1 comprising a power electronic switch, a bypass switch QS3And a disconnector QS1、QS2；
An incoming line end of the power electronic switch and an isolating switch QS1Is connected through QS1Is connected to the first bus bar W1(ii) a Outlet terminal of power electronic switch and isolating switch QS2Is connected through QS2Connected to a third busbar W3；QS1QS, power electronic switch2Form a main flow branch, and the current mainly passes through a first bus W1、QS1QS, power electronic switch2To the third busbar W3Providing electrical energy to the critical loads.
Preferably, a bypass switch QS is connected in parallel to the main flow path branch3A bypass switch.
Preferably, the power electronic switch is made by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then merging the diode rectifier bridge and the full-control power device IGBT into an RCD absorption circuit.
Preferably, the bus of the first power inlet line and the bus of the second power inlet line are respectively connected with a secondary load in a hanging manner.
The utility model discloses can carry out the continuous power supply to the key load that is located the secondary load on two AC power supply source side generating lines and on the power supply terminal generating line, the serious deviation phenomenon of phase place or voltage appears in the AC power supply source of certain one side, when the transformer need overhaul or power electronic switch breaks down, still can supply power to key load and secondary load through the AC power supply source of opposite side, and the time of response and switching is very short, and the continuity is better, do not influence the normal operating of key load.
By the aid of the device, when a power supply is subjected to voltage sag and normal power supply cannot be performed on loads, the power supply circuit is switched to another power supply circuit by switching on or off the power electronic switches on the bus tie switch and the two power transmission paths, so that continuous power supply of key loads and secondary loads is guaranteed as far as possible, and normal work of equipment is not affected. When needs are disconnected for traditional mechanical type circuit breaker, response speed is slower, produces electric arc easily, and can lead to consumer voltage's discontinuity, the utility model discloses an use IGBT to have then improved consumer supply voltage's stability and reliability greatly as the alternating current switch of carrier, and the conversion time under the different situation is shorter, and the reaction is sensitive.
Drawings
Fig. 1 is a circuit block diagram of an embodiment provided by the present invention;
fig. 2 is a circuit diagram of an embodiment provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described in detail and completely with reference to fig. 1 and 2 of the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
As shown in fig. 1, a high-capacity, high-reliability and fast power switching device includes a bus tie switch, a power transmission path 1, a power transmission path 2 and a controller.
The power supply side 1 is a dual-power supply mode of two paths of alternating current power supply inlet wires, and a bus of a first path of power supply inlet wire is connected with a bus of a second path of power supply inlet wire through a bus coupler switch.
The key load is hung on a third bus, the third bus is connected with a bus of the first path of power supply incoming line through a power transmission path 1, and the third bus is also connected with a bus of the second path of power supply incoming line through a power transmission path 2.
The power transmission path 1 and the power transmission path 2 are both paths capable of realizing a connection or disconnection function, and are respectively electrically connected with the controller, and the disconnection or connection operation can be realized through the control of the controller. Similarly, the bus-bar switch is also electrically connected with the controller, and the controller controls the action of the bus-bar switch.
In addition, a secondary load is hung on the bus of the first path of power supply inlet wire and the bus of the second path of power supply inlet wire respectively. Two ac power supplies power critical loads 6 and 7 and secondary load 5 on the bus.
Under normal conditions, two power supplies simultaneously supply electric energy to the key load.
Specifically, as shown in fig. 2, the first power supply V1_inVia a transformer Tr1And breaker QF1Feeding electric energy to the first bus bar W1The above step (1); the second power supply V2_inVia a transformer Tr2And breaker QF2Feeding electric energy to the second bus bar W2The above.
First bus bar W1And a second bus bar W2Connected by a bus coupler switch. Third bus bar W3Is hung with a key load L3And (4) passing. Third bus bar W3And the power transmission device is respectively connected with a bus of a first path of power inlet wire and a bus of a second path of power inlet wire through a power transmission path 1 and a power transmission path 2.
In order to improve the switching speed of each switch, the bus-coupled switch is formed by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then introducing an RCD absorption circuit. (RCD snubber circuit it is formed by resistance Rs, capacitor Cs and diode VDs. resistance Rs can also be connected with diode VDs in parallel. RCD snubber circuit is better to the suppression of overvoltage than RC snubber circuit, and Vce rises the range to be smaller compared with RC circuit
The internal structures of the power transmission path 1 and the power transmission path 2 are the same, and both the power transmission path and the power transmission path are composed of a power electronic switch with the same structure as the bus tie switch and a bypass switch, wherein the bypass switch and the power electronic switch are connected in parallel.
The power transmission path 1 will now be exemplified to describe its internal structure in detail. As shown in fig. 2, the power transmission path 1 comprises a power electronic switch, a bypass switch QS3And a disconnector QS1、QS2. Inlet wire end and isolating switch QS of power electronic switch1Is connected through QS1Is connected to the first bus bar W1Outlet terminal of power electronic switch and isolating switch QS2Is connected through QS2Connected to a third busbar W3；QS1Power electronic switch、QS2Form a main flow branch, and the current mainly passes through a first bus W1、QS1QS, power electronic switch2To the third busbar W3Providing electrical energy to the critical loads.
When the power electronic switch has a fault and needs to be overhauled or replaced in a power failure mode, the QS is isolated through the isolating switch1、QS2It is cut off. In order to be able to ensure that the power supply is still ensured during the maintenance of the power electronic switch, a bypass switch QS is connected in parallel to the main flow path branch3And the bypass switch is closed when the power electronic switch is overhauled, and a current path is temporarily provided for the critical load by the bypass switch.
The power transmission path 2 has the same structure except that the bus connected thereto is the second bus W2And a third bus bar W3。
The structures of the power electronic switches in the power transmission path 1 and the power transmission path 2 are the same as those of the bus-coupled switch, and the power electronic switches are both made by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then introducing an RCD absorption circuit. The input side of the switch is connected to the midpoint of one diode rectifier bridge arm, the output side of the switch is connected to the midpoint of the other diode rectifier bridge arm, whether an alternating current path is connected or not is controlled by controlling the connection and disconnection of a full-control device IGBT, and the RCD absorption circuit is used for absorbing overvoltage generated in the connection and disconnection processes of the IGBT.
The utility model discloses can carry out the continuous power supply to the key load that is located the secondary load on two AC power supply source side generating lines and on the power supply terminal generating line, the serious deviation phenomenon of phase place or voltage appears in the AC power supply source of certain one side, when the transformer need overhaul or power electronic switch breaks down, still can supply power to key load and secondary load through the AC power supply source of opposite side, and the time of response and switching is very short, and the continuity is better, do not influence the normal operating of key load. The working principle and the working steps are as follows:
under the normal working condition, two alternating current power supplies supply power to key load L3 and secondary load L1 and L2 simultaneously, the bus tie switch disconnection, two branches are collected the voltage on generating line W3, and the device is in dark standby state this moment, and the dual supply is in each other and stands by the state.
When voltage of one side is in loss of voltage or a transformer is in fault and needs maintenance, the breaker of the fault side is disconnected at the moment, the bus tie switch is switched on, and therefore the power supply of the other side can supply power to three loads.
When a power electronic switch on a certain power transmission channel has a fault, the bypass switch can be firstly switched on to supply power to the key load, and the power electronic switch is switched on again after the overhaul is finished to supply power to the load again.
In order to analyze the state of the whole circuit and take corresponding measures, the first power supply, the second power supply, the electronic switch in the power transmission path 1, the power electronic switch in the power transmission path 2, the bus coupler switch and the bypass switch are respectively listed and drawn as table 1. In the table, power electronic switch 1 represents an electronic switch in power transmission path 1, power electronic switch 2 represents an electronic switch in power transmission path 2, and bypass switch 1 represents bypass switch QS3Bypass switch 2 represents bypass switch QS8。
Table 1 table of control conditions of high-capacity, high-reliability and fast power switching device:
as can be seen from the above table, the corresponding switch states are when:
1: when the first power supply has no fault, the second power supply has no fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has no fault: the bus tie switch is turned off, the electronic switch 1 is turned on, the electronic switch 2 is turned on, the bypass switch 2 is turned off, and the bypass switch 2 is turned off;
2: when the first power supply has no fault, the second power supply has fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has no fault: the bus coupler switch is switched on, the electronic switch 1 is switched on, the electronic switch 2 is switched on, the bypass switch 2 is switched off, and the bypass switch 2 is switched off;
3: when the first power supply has a fault, the second power supply has no fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has no fault: the bus coupler switch is switched on, the electronic switch 1 is switched on, the electronic switch 2 is switched on, the bypass switch 2 is switched off, and the bypass switch 2 is switched off;
4: when the first path of power supply has a fault and the second path of power supply has a fault: the bus tie switch is turned off, the electronic switch 1 is turned off, the electronic switch 2 is turned off, the bypass switch 2 is turned off, and the bypass switch 2 is turned off;
5: when the first power supply has no fault, the second power supply has no fault, the power electronic switch 1 has fault, and the power electronic switch 2 has no fault: the bus tie switch is turned off, the electronic switch 1 is turned off, the electronic switch 2 is turned on, the bypass switch 2 is turned on, and the bypass switch 2 is turned off;
6: when the first power supply has no fault, the second power supply has no fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has fault: the bus tie switch is turned off, the electronic switch 1 is turned on, the electronic switch 2 is turned off, the bypass switch 2 is turned off, and the bypass switch 2 is turned on;
7: when the first power supply has no fault, the second power supply has no fault, the power electronic switch 1 has fault, and the power electronic switch 2 has fault: the bus tie switch is turned off, the electronic switch 1 is turned off, the electronic switch 2 is turned off, the bypass switch 2 is turned on, and the bypass switch 2 is turned on;
8: when the first power supply has no fault, the second power supply has fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has fault: the bus coupler switch is switched on, the electronic switch 1 is switched on, the electronic switch 2 is switched off, the bypass switch 2 is switched off, and the bypass switch 2 is switched on;
9: when the first power supply has no fault, the second power supply has fault, the power electronic switch 1 has fault, and the power electronic switch 2 has no fault: the bus coupler switch is switched on, the electronic switch 1 is switched off, the electronic switch 2 is switched on, the bypass switch 2 is switched on, and the bypass switch 2 is switched off;
10: when the first power supply has no fault, the second power supply has fault, the power electronic switch 1 has fault, and the power electronic switch 2 has fault: the bus tie switch is turned off, the electronic switch 1 is turned on, the electronic switch 2 is turned on, the bypass switch 2 is turned off, and the bypass switch 2 is turned off;
11: when the first power supply has a fault, the second power supply has no fault, the power electronic switch 1 has no fault, and the power electronic switch 2 has a fault: the bus coupler switch is switched on, the electronic switch 1 is switched on, the electronic switch 2 is switched off, the bypass switch 2 is switched off, and the bypass switch 2 is switched on;
12: when the first power supply has a fault, the second power supply has no fault, the power electronic switch 1 has a fault, and the power electronic switch 2 has no fault: the bus coupler switch is switched on, the electronic switch 1 is switched off, the electronic switch 2 is switched on, the bypass switch 2 is switched on, and the bypass switch 2 is switched off;
13: when the first power supply has a fault, the second power supply has no fault, the power electronic switch 1 has a fault, and the power electronic switch 2 has a fault: the bus coupler switch is switched on, the electronic switch 1 is switched off, the electronic switch 2 is switched off, the bypass switch 2 is switched on, and the bypass switch 2 is switched on.
By the device and the control method, when the voltage sag occurs in the power supply and the load cannot be normally supplied with power, the power is switched to another power supply line by switching on or off the bus-tie switch and the power electronic switches on the two power transmission paths, so that the key load and the secondary load are continuously supplied with power as far as possible, and the normal work of equipment is not influenced. When needs are disconnected for traditional mechanical type circuit breaker, response speed is slower, produces electric arc easily, and can lead to consumer voltage's discontinuity, the utility model discloses an use IGBT to have then improved consumer supply voltage's stability and reliability greatly as the alternating current switch of carrier, and the conversion time under the different situation is shorter, and the reaction is sensitive.
Claims (6)
1. The utility model provides a high reliable quick power switching device of large capacity, includes power side (1) and female switch that allies oneself with, power side (1) is the dual power supply mode of two way alternating current power inlet wires, and the generating line of the first way power inlet wire is connected its characterized in that through the generating line of female switch and second way power inlet wire that allies oneself with:
the key load is hung on a third bus, the third bus is connected with a bus of the first path of power inlet wire through a power transmission path 1, and the third bus is also connected with a bus of the second path of power inlet wire through a power transmission path 2;
the power transmission path 1 and the power transmission path 2 are used for connecting or disconnecting a current path of a key load;
the power transmission path 1, the power transmission path 2 and the bus coupler switch are respectively connected with the controller, and the on-off of the power transmission path 1, the power transmission path 2 and the bus coupler switch is controlled through the controller.
2. A high capacity high reliability fast power switching device as claimed in claim 1, wherein:
the bus-coupled switch is formed by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then merging the diode rectifier bridge and the full-control power device IGBT into an RCD absorption circuit.
3. A high capacity high reliability fast power switching device as claimed in claim 1, wherein:
the internal structures of the power transmission path 1 and the power transmission path 2 are the same;
said transmission path 1 comprising a power electronic switch, a bypass switch QS3And a disconnector QS1、QS2；
An incoming line end of the power electronic switch and an isolating switch QS1Is connected through QS1Is connected to the first bus bar W1(ii) a Outlet terminal of power electronic switch and isolating switch QS2Is connected through QS2Connected to a third busbar W3；QS1QS, power electronic switch2Form a main flow branch, and the current mainly passes through a first bus W1、QS1QS, power electronic switch2To the third busbar W3Providing electrical energy to the critical loads.
4. A high capacity high reliability fast power switching device as claimed in claim 3, wherein:
a bypass switch QS is connected in parallel to the main flow path branch3A bypass switch.
5. A high-capacity high-reliability fast power switching device as claimed in claim 3 or 4, wherein:
the power electronic switch is formed by connecting a diode rectifier bridge and a full-control power device IGBT in parallel and then merging the diode rectifier bridge and the full-control power device IGBT into an RCD absorption circuit.
6. A high capacity high reliability fast power switching device as claimed in claim 1, wherein:
and secondary loads are respectively hung on the bus of the first path of power supply inlet wire and the bus of the second path of power supply inlet wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921039428.1U CN211089218U (en) | 2019-07-05 | 2019-07-05 | High-capacity high-reliability rapid power supply switching device |
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| CN201921039428.1U CN211089218U (en) | 2019-07-05 | 2019-07-05 | High-capacity high-reliability rapid power supply switching device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350650A (en) * | 2019-07-05 | 2019-10-18 | 广西电网有限责任公司梧州供电局 | The highly reliable quick power transfer device of large capacity and its method for handover control |
| CN112054516A (en) * | 2020-09-04 | 2020-12-08 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
| CN115864356A (en) * | 2023-02-17 | 2023-03-28 | 南方电网产业投资集团有限责任公司 | High-voltage direct-current power supply system |
-
2019
- 2019-07-05 CN CN201921039428.1U patent/CN211089218U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350650A (en) * | 2019-07-05 | 2019-10-18 | 广西电网有限责任公司梧州供电局 | The highly reliable quick power transfer device of large capacity and its method for handover control |
| CN110350650B (en) * | 2019-07-05 | 2024-03-22 | 广西电网有限责任公司梧州供电局 | High-capacity high-reliability rapid power supply switching device and switching control method thereof |
| CN112054516A (en) * | 2020-09-04 | 2020-12-08 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
| CN112054516B (en) * | 2020-09-04 | 2022-06-21 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
| CN115864356A (en) * | 2023-02-17 | 2023-03-28 | 南方电网产业投资集团有限责任公司 | High-voltage direct-current power supply system |
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