CN113054736A

CN113054736A - Control method of four-incoming-line power distribution system and four-incoming-line power distribution system

Info

Publication number: CN113054736A
Application number: CN201911389674.4A
Authority: CN
Inventors: 杨槐; 胡冶川; 涂石养; 何勇
Original assignee: Vertiv Tech Co Ltd
Current assignee: Vertiv Tech Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29
Anticipated expiration: 2039-12-27
Also published as: CN113054736B

Abstract

The invention relates to a four-incoming-line power distribution system which comprises a first commercial power supply, a second commercial power supply, a first uninterrupted power supply and a second uninterrupted power supply, wherein the first commercial power supply is connected with a first bus through a first commercial power switch module, the first uninterrupted power supply is connected with the first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterrupted power supply is connected with the second bus through a second switch module, and the first bus is connected with the second bus through a tie switch module. And controlling the on-off of the switch module to control the first commercial power supply and the first uninterruptible power supply to supply power to the first bus respectively, and to control the second commercial power supply and the second uninterruptible power supply to supply power to the second bus respectively. The invention also relates to a control method of the four-inlet-line power distribution system. By implementing the invention, the power supply reliability of the four-inlet-line power distribution system can be ensured at the source, and the overload of an oil engine is avoided.

Description

Control method of four-incoming-line power distribution system and four-incoming-line power distribution system

Technical Field

The invention relates to the field of power distribution systems, in particular to a control method of a four-incoming-line power distribution system and the four-incoming-line power distribution system.

Background

Modern smart grids place new and higher demands on the continuous and reliable operation of power systems. In the field of power distribution with higher requirements on power supply reliability in a data center, extremely high power supply reliability needs to be ensured. The prior art has had various solutions to increase the reliability of the power supply of an uninterruptible power supply. However, when the commercial power and the oil engine are used as the power supply source to supply power simultaneously, a technical scheme for improving the source power supply reliability of the power distribution system by considering from the power supply source is lacked.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a control method for a four-wire-inlet power distribution system and a four-wire-inlet power distribution system, which can ensure the power supply reliability of the power distribution system at the source, aiming at the above-mentioned defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the control method comprises the steps of constructing a four-incoming-line power distribution system, wherein the four-incoming-line power distribution system comprises a first commercial power supply, a second commercial power supply, a first uninterruptible power supply and a second uninterruptible power supply, the first commercial power supply is connected with a first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterruptible power supply is connected with the second bus through a second switch module, and the first bus is connected with the second bus through a tie switch module; the control method comprises the following steps: s1, controlling the on-off of the first commercial power switch module, the second commercial power switch module, the first switch module, the second switch module and the interconnection switch module to control the first commercial power supply and the first uninterrupted power supply to supply power to the first bus respectively and control the second commercial power supply and the second uninterrupted power supply to supply power to the second bus respectively.

In the control method of the four-incoming-line power distribution system according to the present invention, the step S1 further includes:

s11, when the first commercial power supply and the second commercial power supply both work normally, controlling the first commercial power switch module and the second commercial power switch module to be connected and the first switch module, the second switch module and the tie switch module to be disconnected so as to respectively control the first commercial power supply to supply power to the first bus and the second commercial power supply to supply power to the second bus;

s12, when the first commercial power source fails, the second commercial power source works normally, and the first uninterruptible power source is started, controlling the second commercial power switch module and the first switch module to be turned on, and the first commercial power switch module, the second switch module, and the tie switch module to be turned off, so as to control the first uninterruptible power source to supply power to the first bus and the second commercial power source to supply power to the second bus, respectively;

s13, when the first commercial power source fails, the second commercial power source operates normally, and the first uninterruptible power source fails, controlling the second commercial power switch module and the tie switch module to be turned on, and the first commercial power switch module, the first switch module, and the second switch module to be turned off, so as to control the second commercial power source to supply power to the first bus and the second bus, respectively;

s14, when the first commercial power source works normally, the second commercial power source fails, and the second uninterruptible power source is started, controlling the first commercial power switch module and the second switch module to be turned on, and the second commercial power switch module, the first switch module, and the tie switch module to be turned off, so as to control the first commercial power source to supply power to the first bus and the second uninterruptible power source to supply power to the second bus, respectively;

s15, when the first commercial power supply works normally, the second commercial power supply fails and the second uninterruptible power supply fails, controlling the first commercial power switch module and the tie switch module to be switched on and the second commercial power switch module, the first switch module and the second switch module to be switched off so as to respectively control the first commercial power supply to supply power to the first bus and the second bus;

s16, when the first commercial power supply and the second commercial power supply all fail, control the first switch module, the second switch module is switched on and the first commercial power switch module, the second commercial power switch module and the tie switch module are switched off to respectively control the first uninterrupted power supply to the first bus power supply and the second uninterrupted power supply to the second bus power supply.

In the control method of the four-incoming-line power distribution system, the first commercial power supply comprises a first transformer connected with commercial power, the second commercial power supply comprises a second transformer connected with commercial power, the first uninterruptible power supply comprises a first oil engine, and the second uninterruptible power supply comprises a second oil engine.

In the control method of the four-incoming-line power distribution system according to the present invention, the first commercial power switch module includes a first commercial power switch unit, a first commercial power control unit, and a first linkage control unit, and in step S1, controlling the first commercial power switch module to be turned on includes controlling the first commercial power switch unit to be turned on by the first commercial power control unit when the first switch module is turned off and the tie switch module or the second commercial power switch module is turned off based on the first linkage control unit.

In the method for controlling a four-incoming-line power distribution system according to the present invention, the first switch module includes a first switch unit, a first control unit, and a second linkage control unit, and in step S1, controlling the first switch module to be turned on includes controlling the first switch unit to be turned on by the first control unit based on the second linkage control unit when the first switch module and the tie switch module are turned off and the first commercial power fails.

In the control method of the four-incoming-line power distribution system, the second commercial power switch module includes a second commercial power switch unit, a second commercial power control unit and a third linkage control unit, and in step S1, controlling the second commercial power switch module to be turned on includes controlling the second commercial power switch unit to be turned on through the second commercial power control unit based on the third linkage control unit when the second switch module is turned off and the tie switch module or the first commercial power switch module is turned off.

In the method for controlling a four-incoming-line power distribution system according to the present invention, the second switch module includes a second switch unit, a second control unit, and a fourth linkage control unit, and in step S1, controlling the second switch module to be turned on includes controlling the second switch unit to be turned on by the second control unit based on the fourth linkage control unit when the second utility power switch module and the tie switch module are turned off and the second utility power fails.

In the method for controlling a four-incoming-line power distribution system according to the present invention, the tie switch module includes a tie switch unit, a tie switch control unit, and a fifth tie control unit, and in step S1, controlling the tie switch module to be turned on includes controlling the tie switch unit to be turned on by the tie switch control unit based on the fourth tie control unit when the first switch module and the second switch module are turned off and the second utility power switch module or the first utility power switch module is turned off.

Another technical scheme adopted by the invention for solving the technical problems is to construct a four-incoming-line power distribution system, which comprises a first commercial power supply, a second commercial power supply, a first uninterruptible power supply and a second uninterruptible power supply, wherein the first commercial power supply is connected with a first bus through a first commercial power switch module, the first uninterruptible power supply is connected with a first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterruptible power supply is connected with a second bus through a second switch module, and the first bus is connected with the second bus through a tie switch module; the four-wire inlet power distribution system further comprises a control circuit, and the control circuit is used for controlling the first commercial power switch module, the second commercial power switch module, the first switch module, the second switch module and the on-off of the interconnection switch module to control the first commercial power source and the first uninterruptible power source to supply power to the first bus respectively and control the second commercial power source and the second uninterruptible power source to supply power to the second bus respectively.

In the four-wire inlet power distribution system of the present invention, the control circuit further includes:

the first control module is used for controlling the first commercial power switch module and the second commercial power switch module to be switched on and the first switch module, the second switch module and the interconnection switch module to be switched off so as to respectively control the first commercial power supply to supply power to the first bus and the second commercial power supply to supply power to the second bus when the first commercial power supply and the second commercial power supply both work normally;

the second control module is used for controlling the second mains supply switch module and the first switch module to be switched on and the first mains supply switch module, the second switch module and the interconnection switch module to be switched off so as to respectively control the first uninterruptible power supply to supply power to the first bus and the second mains supply to supply power to the second bus when the first mains supply fails, the second mains supply normally works and the first uninterruptible power supply is started;

the third control module is used for controlling the second mains supply switch module and the interconnection switch module to be switched on and the first mains supply switch module, the first switch module and the second switch module to be switched off so as to respectively control the second mains supply to supply power to the first bus and the second bus when the first mains supply fails, the second mains supply normally works and the first uninterruptible power supply fails;

the fourth control module is used for controlling the first commercial power switch module and the second switch module to be switched on and the second commercial power switch module, the first switch module and the interconnection switch module to be switched off so as to respectively control the first commercial power supply to supply power to the first bus and the second uninterruptible power supply to supply power to the second bus when the first commercial power supply works normally, the second commercial power supply fails and the second uninterruptible power supply is started;

the fifth control module is used for controlling the first commercial power switch module and the tie switch module to be switched on and the second commercial power switch module, the first switch module and the second switch module to be switched off so as to respectively control the first commercial power supply to supply power to the first bus and the second bus when the first commercial power supply works normally, the second commercial power supply fails and the second uninterruptible power supply fails;

and the sixth control module is used for controlling the first switch module, the second switch module, the first mains switch module and the connection switch module to be disconnected so as to control the first uninterrupted power supply to supply power to the first bus and the second uninterrupted power supply to supply power to the second bus respectively when the first mains power supply and the second mains power supply fail and the first uninterrupted power supply and the second uninterrupted power supply start respectively.

By implementing the control method of the four-incoming-line power distribution system and the four-incoming-line power distribution system, the mains supply and the uninterrupted power supply are prevented from supplying power to the same bus at the same time, the power supply reliability of the four-incoming-line power distribution system can be ensured at the source, the overload of an oil engine is avoided, and the stability of two mains supply sources and two uninterrupted power supplies is ensured.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic diagram of a four-wire inlet power distribution system to which the control method of the four-wire inlet power distribution system of the present invention is applied;

fig. 2 is a control schematic of a first mains switch module of a preferred embodiment of the four-wire inlet power distribution system of the invention;

figure 3 is a control schematic of a first switch module of a preferred embodiment of the four-wire inlet power distribution system of the present invention;

fig. 4 is a control schematic of a second mains switch module of a preferred embodiment of the four-wire inlet power distribution system of the invention;

figure 5 is a control schematic of a second switch module of the preferred embodiment of the four-wire inlet power distribution system of the present invention;

figure 6 is a control schematic of the tie switch module of the preferred embodiment of the four-wire power distribution system of the present invention;

fig. 7 is a schematic block diagram of a preferred embodiment of the four-wire power distribution system of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention relates to a control method of a four-incoming-line power distribution system, wherein the four-incoming-line power distribution system comprises a first commercial power supply, a second commercial power supply, a first uninterruptible power supply and a second uninterruptible power supply, the first commercial power supply is connected with a first bus through a first commercial power switch module, the first uninterruptible power supply is connected with a first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterruptible power supply is connected with a second bus through a second switch module, and the first bus is connected with the second bus through a tie switch module; the control method comprises the following steps: through controlling the on-off of the first commercial power switch module, the second commercial power switch module, the first switch module, the second switch module and the interconnection switch module, the first commercial power source and the first uninterruptible power supply respectively supply power to the first bus, and the second commercial power source and the second uninterruptible power supply respectively supply power to the second bus. By implementing the control method of the four-incoming-line power distribution system, the mains supply and the uninterrupted power supply are prevented from supplying power to the same bus at the same time, the power supply reliability of the four-incoming-line power distribution system can be ensured at the source, the overload of an oil engine is avoided, and the stability of two mains supply sources and two uninterrupted power supplies is ensured.

Fig. 1 shows a schematic diagram of a four-wire inlet power distribution system to which the control method of the four-wire inlet power distribution system of the present invention is applied. As shown in fig. 1. The four-wire inlet power distribution system comprises a first mains supply M1, a second mains supply M2, a first uninterruptible power supply P1 and a second uninterruptible power supply P2. First mains supply M1 connects first bus I through first mains switch module K2, first uninterrupted power supply P1 connects first bus I through first switch module K1, second mains supply M2 connects second bus II through second mains switch module K4, second uninterrupted power supply P2 connects second bus II through second switch module K5. The first bus I and the second bus II are connected via a tie switch module K3.

In the control method of the four-incoming-line power distribution system, the first commercial power supply M1 and the first uninterruptible power supply P1 are controlled to respectively supply power to the first bus I, and the second commercial power supply M2 and the second uninterruptible power supply P2 are controlled to respectively supply power to the second bus II by controlling the on/off of the first commercial power switch module K2, the second commercial power switch module K4, the first switch module K1, the second switch module K5 and the interconnection switch module K3.

In a preferred embodiment of the present invention, the first utility power switch module K2, the second utility power switch module K4, the first switch module K1, the second switch module K5, and the tie switch module K3 are set to be turned on or off in different manners in different operating modes, so that the utility power and the ups do not supply power to the same bus at the same time, thereby avoiding two utility power supply conflicts through the tie switch module K3, avoiding the ups overloading due to the fact that the ups supplies power to two buses at the same time, and ensuring reliable and stable operation of power supply systems of the two utility power and the two ups.

By implementing the control method of the four-incoming-line power distribution system, the mains supply and the uninterrupted power supply are prevented from supplying power to the same bus at the same time, the power supply reliability of the four-incoming-line power distribution system can be ensured at the source, the overload of an oil engine is avoided, and the stability of two mains supply sources and two uninterrupted power supplies is ensured.

In a preferred embodiment of the present invention, the first mains supply M1 comprises a first transformer connected to the mains, the second mains supply M2 comprises a second transformer connected to the mains, the first ups P1 comprises a first oil engine, and the second ups P2 comprises a second oil engine. Other power supply components or assemblies may be provided in other preferred embodiments of the present invention, such as a rectifier filter network connected to a transformer, an AC/DC converter, a rectifier filter network connected to an oil engine, a DC/DC converter, and so forth. Of course, in a further preferred embodiment of the present invention, the uninterruptible power supply may also be a rechargeable battery, a solar battery, a blower, or the like.

In this preferred embodiment, the first utility power switch module K2, the second utility power switch module K4, the first switch module K1, the second switch module K5 and the tie switch module K3 may be mechanically and electrically interlocked and may be controlled manually or automatically. Any linkage known in the art may be suitable for use in the present invention.

In a further preferred embodiment of the invention, the first mains supply M1, the second mains supply M2, the first ups P1 and the second ups P2 may be arranged to operate in six operating modes as shown in table 1. Through in different mode, control first mains switch module K2 second mains switch module K4 first switch module K1 second switch module K5 with contact switch module K3's switch, and then avoid mains supply and uninterrupted power source to supply power to same bus simultaneously to avoid oily machine overload, ensure two way mains supply and two way uninterrupted power source's stability.

TABLE 1

In a first mode of operation, namely when first mains supply M1 with when second mains supply M2 all normally worked, control first mains switch module K2 with second mains switch module K4 switches on just first switch module K1 second switch module K5 with tie switch module K3 disconnects in order to control respectively first mains supply M1 to first bus I supplies power just second mains supply M2 to second bus II supplies power.

In the second mode of operation, when first mains supply M1 is invalid second mains supply M2 normally works just when first uninterrupted power supply P1 starts, control second mains supply switch module K4 with first switch module K1 switches on just first mains supply switch module K2 second switch module K5 with tie switch module K3 breaks off with control respectively first uninterrupted power supply P1 to first bus I supplies power just second mains supply M2 to the power supply of second bus II.

In the third mode of operation, when first mains supply M1 is invalid, second mains supply M2 normally works just when first uninterrupted power supply P1 is invalid, control second mains switch module K4 with tie switch module K3 switches on just first mains switch module K2 first switch module K1 with second switch module K5 disconnects with control respectively second mains supply M2 to first bus I with the power supply of second bus II.

In the fourth mode of operation, when first mains supply M1 normal work second mains supply M2 just became invalid when second uninterrupted power supply P2 started, control first mains switch module K2 with second switch module K5 switches on just second mains switch module K4 first switch module K1 with tie switch module K3 disconnects in order to control respectively first mains supply M1 to first bus I supplies power just second uninterrupted power supply P2 to second bus II supplies power.

In the fifth mode of operation, work as first mains supply M1 normal work second mains supply M2 just the second uninterrupted power supply P2 is out of order, control first mains switch module K2 with tie switch module K3 switches on just second mains switch module K4 first switch module K1 with second switch module K5 breaks off with control respectively first mains supply M1 to first bus I with the power supply of second bus II.

In the sixth mode of operation, when first mains supply M1 with when second mains supply M2 all became invalid, just first uninterrupted power supply P1 with when uninterrupted power supply P2 started, control first switch module K1 second switch module K5 switch on just first mains switch module K2 second mains switch module K4 with tie switch module K3 breaks off with control respectively first uninterrupted power supply P1 to first bus I power supply just second uninterrupted power supply P2 to second bus II power supply.

In the invention, by controlling only two switch modules in the first commercial power switch module K2, the second commercial power switch module K4, the first switch module K1, the second switch module K5 and the interconnection switch module K3 to be conducted and the commercial power switch module and the switch modules are not conducted at the same time, the commercial power supply and the uninterruptible power supply can be prevented from supplying power to the same bus at the same time, so that the overload of the oil engine is avoided, and the stability of the two commercial power supplies and the two uninterruptible power supplies is ensured.

In a further preferred embodiment of the present invention, the first utility power switch module K2, the second utility power switch module K4, the first switch module K1, the second switch module K5, and the interconnection switch module K3 adopt frame switches, and by using the closing principle of the frame switches, as long as the auxiliary contacts (normally closed contacts) of other switches are connected in series or in parallel in the electrical closing circuit thereof, the closing of the switch module is controlled by the on-off setting logic of the auxiliary contacts of other switches to realize the interlocking function, thereby realizing the on-off of each switch module K1-K5. Fig. 2 to 6 show the structure and the control principle of the first mains switch module K2, the second mains switch module K4, the first switch module K1, the second switch module K5 and the tie switch module K3, respectively.

As shown in fig. 2, the first mains switch module K2 comprises a first mains switch unit K21, a first mains control unit K22 and a first coordinated control unit K23. In this embodiment, controlling the first mains switch module K2 to be turned on includes controlling the first mains switch unit K21 to be turned on through the first mains control unit K22 based on the first linkage control unit K23 when the first switch unit K11 is turned off and the tie switch unit K31 or the second mains switch unit K41 is turned off.

As shown in fig. 2, the switching on of the first mains switching unit K21 may include manual switching on and automatic switching on. The first mains control unit K22 comprises a changeover switch 2SA, a closing button 2ST, and

connection contacts

209, 203, 213. When the change-over switch 2SA is switched to the manual gear, that is, the

contacts

203 and 209 are switched on, by manually pressing the 2ST switch-on button, the switch-on coil is energized, and the first commercial power switch unit K21 is controlled to be turned on. When change-over switch 2SA shifts to automatic gear, contact 203 and 213 switch-on promptly, when control power source L22 received power to control first mains switch unit K21's time relay 2 KT's time delay closed contact sets up automatic time delay, switch-on switch combined floodgate coil, realizes first mains switch unit K21 autoswitch-on. The disconnection of the first commercial power switch unit K21 is divided into manual brake-separating and under-voltage tripping, and by manually pressing a 2STP brake-separating button, a switch brake-separating coil is electrified, and an electric brake-separating is switched; when the undervoltage coil is powered off, the switch can be subjected to undervoltage tripping.

A precondition for the first mains switch unit K21 to close is that the first switch unit K11 is open and the tie switch unit K31 or the second mains switch unit K41 is open. Since the first coordinated control unit K23 controls the switching of the

contacts

201, 200 and 203 according to the state of the first switch module K1, the tie switch module K3 and the second mains switch module K4. When the first switching unit K11 is switched on, the

contacts

201 and 200 cannot be switched on, thus controlling the first mains switching unit K21 to be switched on. On the contrary, when the first switching unit K11 is open, the first mains switching unit K21 can be closed. This is because, as mentioned above, the mains supply and the ups can only be combined into one. When the tie switch unit K31 and the second mains switch unit K41 are closed simultaneously, the

contacts

200 and 203 cannot be switched on, and therefore the first mains switch unit K21 cannot be closed. Only when any one of the tie switch unit K31 and the second mains switch unit K41 is disconnected, the first mains switch unit K21 can be switched on, and the principle is that the two mains power supplies and the tie switch can be switched on and off only in two. In this way, an electrically interlocking control of the second mains switch module K4, the first switch module K1 and the tie switch module K3 can be achieved.

As shown in fig. 3, the first switching module K1 includes a first switching unit K11, a first control unit K12, and a second linkage control unit K13. In this embodiment, controlling the first switching module K1 to be turned on includes controlling the first switching unit K11 to be turned on by the first control unit K12 based on the second linkage control unit K13 when the first switching unit K11 and the tie switching unit K31 are turned off and the first commercial power source M1 fails.

As shown in fig. 3, the turning on of the first switching unit K11 may include manual closing and automatic closing. The first control unit K12 comprises a change-over switch 1SA, a closing button 1ST, and connecting

contacts

109, 103, 113. When the change-over switch 1SA is shifted to the manual position, i.e. the

contacts

103 and 109 are switched on, the switch closing coil is energized by manually pressing the 1ST closing button, and the first switch unit K11 is controlled to be switched on. When the change-over switch 1SA is switched to the automatic gear, i.e. the

contacts

103 and 113 are switched on, the control power source L12 is powered on, thereby controlling the time-delay closed contact of the time relay 1KT of the first switch unit K11, setting the automatic time delay, switching on the switch closing coil, and realizing the automatic closing of the first switch unit K11. The disconnection of the first switch unit K11 is divided into manual opening and under-voltage tripping, and by manually pressing a 1STP opening button, a switch opening coil is electrified, and electric opening is switched; when the undervoltage coil is powered off, the switch can be subjected to undervoltage tripping.

A precondition for the first switching unit K11 to close is that the first mains switching unit K21 and the tie switching unit K31 are open and the first mains supply M1 fails. This is because the second linkage control unit K13 will control the switching of the

contacts

101, 100 and 103 depending on the operating state of the first mains switch module K2, the tie switch module K3 and the first mains supply M1. When the first commercial power switch module K2 or the tie switch module K3 is turned on or the first commercial power supply M1 works normally, the

contacts

101 and 103 cannot be turned on, so that the first switch unit K11 is controlled to be switched on. Instead the first switching unit K11 can only be switched on when the first mains switching module K2 and the tie switching module K3 are open and the first mains supply M1 fails. This is because, as described above, the utility power supply and the uninterruptible power supply can only be combined into one, the uninterruptible power supply and the interconnection switch can only be combined into one, and the utility power supply cannot be combined with the uninterruptible power supply during normal operation, thereby realizing the electrical interlock control of the first utility power switch module K2 and the interconnection switch module K3.

As shown in fig. 4, the second mains switching module K4 comprises a second mains switching unit K41, a second mains control unit K42 and a third mains control unit K43. In this embodiment, controlling the second mains switch module K4 to be turned on includes controlling the second mains switch unit K41 to be turned on by the second mains control unit K42 based on the third linkage control unit K43 when the second switch unit K51 is turned off and the tie switch unit K31 or the first mains switch unit K21 is turned off.

As shown in fig. 4, the switching on of the second mains switching unit K41 may include manual switching on and automatic switching on. The second mains control unit K42 comprises a change-over switch 2SA, a closing button 2ST, and

connection contacts

409, 403, 413. When the change-over switch 2SA is switched to the manual gear, that is, the

contacts

403 and 409 are switched on, the switch closing coil is powered by manually pressing the 2ST closing button, and the second commercial power switch unit K41 is controlled to be switched on. When the change-over switch 2SA is switched to the automatic gear, that is, the

contacts

403 and 413 are switched on, and when the control power source L22 is powered on, the time delay contact of the time relay 2KT of the second commercial power switch unit K41 is controlled, the automatic time delay is set, the switch closing coil is switched on, and the second commercial power switch unit K41 is automatically switched on. The disconnection of the second commercial power switch unit K41 is divided into manual brake-separating and under-voltage tripping, and by manually pressing a 2STP brake-separating button, a switch brake-separating coil is electrified, and electric brake-separating is switched; when the undervoltage coil is powered off, the switch can be subjected to undervoltage tripping.

A precondition for the switching on of the second mains switch unit K41 is that the second switch unit K51 is switched off simultaneously with the switching off of either the tie switch unit K31 or the first mains switch unit K21. When the second switching unit K51 is switched on, the

contacts

401 and 400 cannot be switched on, thus controlling the second mains switching unit K41 to be switched on. On the contrary, when the second switching unit K51 is open, the second mains switching unit K41 can be closed. This is because, as mentioned above, the mains supply and the ups can only be combined into one. When the tie switch unit K31 and the first mains switch unit K21 are closed simultaneously, the

contacts

400 and 403 cannot be switched on, and therefore the second mains switch unit K41 cannot be closed. Only when any one of the tie switch unit K31 and the first mains switch unit K21 is disconnected, the second mains switch unit K41 can be switched on, and the principle is that the two mains power supplies and the tie switch can be switched on and off only in two. In this way, an electrically interlocking control of the first mains switch module K2, the second switch module K5 and the tie switch module K3 can be achieved.

As shown in fig. 5, the second switching module K5 includes a second switching unit K51, a second control unit K52, and a fourth linkage control unit K53. In this embodiment, controlling the second switch module K5 to be turned on includes controlling the second switch unit K51 to be turned on by the second control unit K52 based on the fourth linkage control unit K53 when the second mains switch unit K41 and the tie switch unit K31 are turned off and the second mains supply M2 fails.

As shown in fig. 5, the turning on of the second switching unit K51 may include manual closing and automatic closing. The second control unit K52 includes a changeover switch 1SA, a closing button 1ST, and

connection contacts

509, 503, and 513. When the change-over switch 1SA is shifted to the manual position, i.e. the

contacts

503 and 509 are switched on, the switch closing coil is energized by manually pressing the 1ST closing button, and the second switch unit K51 is controlled to be switched on. When the change-over switch 1SA is switched to the automatic position, i.e. the

contacts

503 and 513 are switched on, the control power source L12 is powered on, thereby controlling the time-delay closed contact of the time relay 1KT of the second switch unit K51, setting the automatic time-delay time, switching on the switch closing coil, and realizing the automatic closing of the second switch unit K51. The disconnection of the second switch unit K51 is divided into manual opening and under-voltage tripping, and by manually pressing a 1STP opening button, a switch opening coil is electrified, and electric opening is switched; when the undervoltage coil is powered off, the switch can be subjected to undervoltage tripping.

A precondition for the second switching unit K51 to close is that the second mains switching unit K41 and the tie switching unit K31 are open and the second mains supply M2 fails. This is because the fourth linkage control unit K53 will control the switching of the

contacts

501, 500 and 503 depending on the operating state of the second mains switch unit K41, the tie switch module K3 and the second mains supply M2. Only when the second mains switching unit K41 and the tie switching unit K31 are open and the second mains supply M2 fails, can the second switching unit K51 be switched on. When the second mains switch unit K41 or the tie switch unit K31 is switched on or the second mains supply M2 is operating normally, the

contacts

501 and 503 cannot be switched on, thus controlling the second switch unit K51 to be switched on. This is because, as described above, the utility power supply and the uninterruptible power supply can only be combined into one, the uninterruptible power supply and the interconnection switch can only be combined into one, and the utility power supply cannot be combined with the uninterruptible power supply during normal operation, thereby realizing the electrical interlock control of the second utility power switch module K4 and the interconnection switch module K3.

As shown in fig. 6, the tie switch module K3 includes a tie switch unit K31, a tie switch control unit K32, and a fifth tie control unit K33. In this embodiment, controlling the tie switch module K3 to be turned on includes controlling the tie switch unit K31 to be turned on by the tie switch control unit K32 when the first switch unit K11 and the second switch unit K51 are turned off and the second mains switch unit K41 or the first mains switch unit K21 are turned off based on the fourth tie control unit.

As shown in fig. 6, the interconnection switch control unit K32 includes a closing button 1ST and an opening button 1STP, and connects the

contacts

303, 305, and 307. When the switch is manually switched on, the 1ST switch-on button is manually pressed, the switch-on coil is electrified, and the contact switch unit K31 is electrically switched on. And (3) manual opening, wherein the opening coil of the switch is electrified by manually pressing the opening button of the 1STP, and the switch unit K31 is communicated for electric opening. As a precondition for switching on the interconnection switch unit K31, the first switch unit K11 and the second switch unit K51 are disconnected, and the second commercial power switch unit K41 or the first commercial power switch unit K21 is disconnected. When the first switching unit K11 and the second switching unit K51 are closed, the

contacts

301 and 300 cannot be turned on, and the tie switching unit K31 cannot be electrically closed, and on the contrary, the tie switching unit K31 can be closed only when the first switching unit K11 or the second switching unit K51 is turned off. This is because, as mentioned above, the tie switch and the ups switch can only be combined into one. When the second mains switch unit K41 and the first mains switch unit K21 are switched on simultaneously, the

contacts

300 and 303 cannot be switched on, and the tie switch unit K31 cannot be switched on electrically, whereas the tie switch unit K31 can be switched on only when the second mains switch unit K41 or the first mains switch unit K21 is switched off. The principle is that two mains supplies and a tie switch can only be combined into two, so that the first mains switch module K2, the second mains switch module K4, the first switch module K1 and the second switch module K5 are electrically interlocked and controlled.

Fig. 7 is a schematic block diagram of a preferred embodiment of the four-wire power distribution system of the present invention. As shown in fig. 7, the four-wire power distribution system includes a first commercial power source M1, a second commercial power source M2, a first uninterruptible power supply P1, a second uninterruptible power supply P2, and a control circuit 100. First mains supply M1 connects first bus I through first mains switch module K2, first uninterrupted power source P1 connects first bus I through first switch module K1, second mains supply M2 connects second bus II through second mains switch module K4, second uninterrupted power source P2 connects second bus II through second switch module K5, first bus I with second bus II connects through tie switch module K3. Control circuit 100 for through control first commercial power switch module K2 second commercial power switch module K4 first switch module K1 second switch module K5 with tie switch module K3's break-make, control first commercial power supply M1 with first uninterrupted power source P1 respectively to first bus I supplies power, and control second commercial power supply M2 with second uninterrupted power source P2 respectively to second bus II supplies power.

In a preferred embodiment of the present invention, the control circuit 100 further comprises: and the first control module, the second control module, the third control module, the fourth control module and the fourth control module are used for controlling the four-inlet-line power distribution system to work in six modes. First control module is used for when first mains supply M1 with when second mains supply M2 is all normally worked, control first mains switch module K2 with second mains switch module K4 switch on just first switch module K1 second switch module K5 with tie switch module K3 breaks off with control respectively first mains supply M1 to first bus I power supply just second mains supply M2 to second bus II power supply. The second control module is used for when first mains supply M1 is invalid second mains supply M2 normally works just when first uninterrupted power source P1 starts, control second mains supply switch module K4 with first switch module K1 switches on just first mains supply switch module K2 second switch module K5 with tie switch module K3 breaks off with control respectively first uninterrupted power source P1 to first bus I supplies power just second mains supply M2 to second bus II supplies power. The third control module is used for when first mains supply M1 is invalid, second mains supply M2 normally works just when first uninterrupted power source P1 is invalid, control second mains supply switch module K4 with tie switch module K3 switches on just first mains supply switch module K2 first switch module K1 with second switch module K5 breaks off with control respectively second mains supply M2 to first bus I with the power supply of second bus II. The fourth control module is used for when first mains supply M1 normal work second mains supply M2 just the second uninterrupted power source P2 is just started, control first mains supply switch module K2 with second switch module K5 switches on just second mains supply switch module K4 first switch module K1 with tie switch module K3 breaks off with control respectively first mains supply M1 to first bus I supplies power just second uninterrupted power source P2 to second bus II supplies power. The fifth control module is used for when first mains supply M1 normal work second mains supply M2 just when second uninterrupted power source P2 became invalid, control first mains supply switch module K2 with tie switch module K3 switches on just second mains supply switch module K4 first switch module K1 with second switch module K5 breaks off with control respectively first mains supply M1 to first bus I with the power supply of second bus II. Sixth control module, be used for when first mains supply M1 with when second mains supply M2 all became invalid, and when first uninterrupted power source P1 and second uninterrupted power source P2 started, control first switch module K1 second switch module K5 switch on just first mains switch module K2 second mains switch module K4 with tie switch module K3 breaks off with control respectively first uninterrupted power source P1 to first bus I power supply just second uninterrupted power source P2 to second bus II power supply.

Those skilled in the art will appreciate that the first and second utility power sources M1, M2, the first and second upss P1, P2, and the control circuit 100 may be constructed in accordance with the embodiments shown in fig. 1-6.

In addition, the control circuit and the first to sixth control modules may be implemented by hardware, software, or a combination of software and hardware. The present invention can be realized in a centralized fashion in at least one computer system, or in a distributed fashion where different elements are spread across several interconnected computer systems. Any kind of computer system or other apparatus adapted for carrying out the methods of the present invention is suited. A typical combination of hardware and software could be a general purpose computer system with a computer program that, when being loaded and executed, controls the computer system such that it carries out the methods described herein.

The control circuit and the first to sixth control modules described above may also be implemented by a computer program product comprising all the features enabling the implementation of the method of the invention when installed in a computer system. The computer program in this document refers to: any expression, in any programming language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) conversion to other languages, codes or symbols; b) reproduced in a different format.

By implementing the four-incoming-line power distribution system, the mains supply and the uninterrupted power supply are prevented from supplying power to the same bus at the same time, the power supply reliability of the four-incoming-line power distribution system can be ensured at the source, the overload of an oil engine is avoided, and the stability of two mains supply sources and two uninterrupted power supplies is ensured.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A control method of a four-incoming-line power distribution system comprises a first commercial power supply, a second commercial power supply, a first uninterruptible power supply and a second uninterruptible power supply, and is characterized in that the first commercial power supply is connected with a first bus through a first commercial power switch module, the first uninterruptible power supply is connected with the first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterruptible power supply is connected with the second bus through a second switch module, and the first bus is connected with the second bus through a tie switch module;

the control method comprises the following steps:

s1, controlling the on-off of the first commercial power switch module, the second commercial power switch module, the first switch module, the second switch module and the interconnection switch module to control the first commercial power supply and the first uninterrupted power supply to supply power to the first bus respectively and control the second commercial power supply and the second uninterrupted power supply to supply power to the second bus respectively.

2. The control method of the four-wire inlet power distribution system according to claim 1, wherein the step S1 further comprises:

3. The control method of the four-wire inlet power distribution system according to claim 2, wherein the first utility power supply comprises a first transformer connected to utility power, the second utility power supply comprises a second transformer connected to utility power, the first uninterruptible power supply comprises a first oil engine, and the second uninterruptible power supply comprises a second oil engine.

4. The control method of the four-wire inlet power distribution system according to claim 3, wherein the first commercial power switch module comprises a first commercial power switch unit, a first commercial power control unit and a first linkage control unit, and in the step S1, controlling the first commercial power switch module to be turned on comprises controlling the first commercial power switch unit to be turned on through the first commercial power control unit based on the first linkage control unit when the first switch module is turned off and the tie switch module or the second commercial power switch module is turned off.

5. The control method of a four-wire inlet power distribution system according to claim 3, wherein the first switch module comprises a first switch unit, a first control unit and a second linkage control unit, and in step S1, controlling the first switch module to be turned on comprises controlling the first switch unit to be turned on by the first control unit based on the second linkage control unit when the first utility module and the tie switch module are turned off and the first utility power source fails.

6. The control method of the four-wire inlet power distribution system according to claim 3, wherein the second commercial power switch module comprises a second commercial power switch unit, a second commercial power control unit and a third linkage control unit, and in step S1, controlling the second commercial power switch module to be turned on comprises controlling the second commercial power switch unit to be turned on based on the third linkage control unit when the second switch module is turned off and the tie switch module or the first commercial power switch module is turned off.

7. The control method of the four-wire inlet power distribution system according to claim 3, wherein the second switch module comprises a second switch unit, a second control unit and a fourth linkage control unit, and in the step S1, controlling the second switch module to be turned on comprises controlling the second switch unit to be turned on based on the fourth linkage control unit when the second mains switch module and the tie switch module are turned off and the second mains power supply fails through the second control unit.

8. The control method of the four-wire inlet power distribution system according to claim 3, wherein the tie switch module comprises a tie switch unit, a tie switch control unit and a fifth tie control unit, and in the step S1, controlling the tie switch module to be turned on comprises controlling the tie switch unit to be turned on based on the fourth tie control unit when the first switch module and the second switch module are turned off and the second utility power switch module or the first utility power switch module is turned off.

9. A four-incoming-line power distribution system comprises a first commercial power supply, a second commercial power supply, a first uninterruptible power supply and a second uninterruptible power supply, and is characterized in that the first commercial power supply is connected with a first bus through a first commercial power switch module, the first uninterruptible power supply is connected with the first bus through a first switch module, the second commercial power supply is connected with a second bus through a second commercial power switch module, the second uninterruptible power supply is connected with the second bus through a second switch module, and the first bus is connected with the second bus through a connection switch module;

the four-wire inlet power distribution system further comprises a control circuit, and the control circuit is used for controlling the first commercial power switch module, the second commercial power switch module, the first switch module, the second switch module and the on-off of the interconnection switch module to control the first commercial power source and the first uninterruptible power source to supply power to the first bus respectively and control the second commercial power source and the second uninterruptible power source to supply power to the second bus respectively.

10. The four-wire inlet power distribution system of claim 9, wherein the control circuit further comprises: