CN110492600B - Novel intelligent direct-current power supply system of transformer substation and maintenance method - Google Patents

Abstract

The invention relates to a new type of intelligent DC power supply system and maintenance method for substations, belonging to the technical field of DC power supply systems in substations; the system includes DC busbars and feeders, first to Nth battery packs, first to Nth battery pack switches, Intelligent discharge maintenance module, supplementary charging module, and battery inspection module, the first to Nth battery packs are connected in parallel, and the Mth battery pack is hung on the DC bus through the switch of the Mth battery pack; The Nth storage battery pack is charged, and the first to Nth storage battery packs can supply power to the DC bus and feeder at the same time when the AC power is lost; the first to Nth storage battery packs share a supplementary charging power supply and intelligent discharge load. During maintenance, the Mth storage battery pack In the state of floating charging, disconnect the switch of the Mth battery pack, close the Mth discharge switch, start the intelligent discharge load, discharge the Mth battery pack, and realize the maintenance-free discharge of the Mth battery pack.

Description

Substation new intelligent DC power supply system and its maintenance method

technical field

The invention relates to a novel intelligent DC power supply system of a substation and a maintenance method, and belongs to the technical field of the DC power supply system of a substation.

Background technique

The DC power system is the core of the entire substation power system and the basis for the safe operation of the substation. Years of power system operation experience has proved that at the critical moment when substation equipment fails, if the DC power supply system is abnormal or malfunctions, it will inevitably cause serious damage to the main equipment or fire, equipment explosion, large-scale power outage of the power grid, and even severe regional power grid disconnection. as a result of.

The current DC power supply system often has accidents that cause the entire DC power supply to lose power due to the open circuit of the battery pack, and the biggest problem existing in the current DC power supply system is the difficulty in completing the check discharge maintenance of the battery in accordance with the requirements of the State Grid.

At present, the battery pack connection mode of the DC power system of the substation is the way of connecting a single battery pack in series. The specific system schematic diagram is shown in Figure 1. The DC power supply system adopting the single-group series connection mode of batteries can only perform 50% check discharge maintenance for the battery packs due to the connection method of single-set series-connected batteries, and cannot perform 100% check discharge maintenance. Once there is a problem with the quality or operation of the battery, a system accident will inevitably occur, and the single-series battery pack must carry a spare battery to the site before it can be discharged and maintained. Therefore, the existing DC power supply system has low operational safety and reliability, and the maintenance workload is large. Difficult maintenance issues.

Chinese patent 201320884169.9 discloses a substation DC power supply system with an emergency backup power supply. A substation DC power supply system with an emergency backup power supply is provided with an AC bus bar and a DC bus bar; The incoming power supply is connected; the AC bus and the DC bus are connected through several parallel charging module lines, and each charging module line is connected in series with the charging module and the DC contactor; the DC bus is also connected to the battery pack ; It is characterized in that: a DC power conversion switch is connected in series on the connection line between the DC bus and the storage battery, and the storage battery is provided in parallel with two groups, which are the normal storage battery and the emergency backup storage battery; A DC power detection device is also provided on the connection line between the storage battery pack and the DC power conversion switch, and the two detection wire ends of the DC power detection device are respectively connected between the normal storage battery pack, the emergency backup battery pack and the DC power conversion switch. On the connecting line between them, the control line end of the DC power detection device is connected with the DC power conversion switch.

There are 2 sets of battery packs in total, which are the first set of batteries and the second set of batteries, which are connected to the DC power detection device and the DC power conversion switch. Normally, only one set of storage batteries is connected to the DC power bus through the DC power conversion switch. The DC power detection device detects the voltage of the DC bus and the two battery packs, and sends corresponding signals to the DC power conversion switch. If the DC power bus voltage is normal and both battery groups are normal, the DC power transfer switch automatically selects battery group 1; if the DC power bus voltage is normal but one battery group is abnormal, the DC power transfer switch automatically selects the normal group battery pack; if the voltage of the DC power bus is overvoltage, undervoltage, or power-off and the two battery packs are normal, the DC power switch will automatically select battery pack 1; if the voltage of the DC power bus is overvoltage, undervoltage, In case of power failure and only one of the two battery groups is normal, the DC transfer switch automatically selects the normal battery group. If the voltage of the DC power bus is normal and any of the two sets of battery packs is undervoltage, it will switch to this set for charging, and automatically connect to this set of batteries after charging. In this way, one of the two sets of battery packs on the DC power supply bus is always out of operation and is not connected to the DC power supply system. Instead, it is used as an emergency backup power supply under special circumstances, so that the two sets of battery packs can be used as backup for each other. If the DC power supply detection device detects that the DC bus voltage disappears, it means that the two AC power sources and one set of DC batteries are faulty, and the DC power conversion switch is put into the emergency backup battery group to ensure the recovery of the DC bus voltage. Since the emergency backup battery pack is not connected to the DC bus when the DC power system is in normal operation, it will not be affected by the operation of the grid system, which ensures the safety of the emergency backup battery pack and greatly improves the reliability of the DC power system.

However, only to provide a reliable emergency backup power supply when the DC power supply of the substation fails, there are still problems of heavy maintenance workload and difficult maintenance.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a new type of intelligent DC power supply system and maintenance method for substations, and solve the problems of low reliability and difficult maintenance of existing single-series battery packs.

The novel intelligent DC power supply system of the substation according to the present invention includes a DC bus and a feeder, and also includes the first to Nth storage battery packs, the first to Nth storage battery pack switches, an intelligent discharge maintenance module, a supplementary charging module, and a battery inspection module, The first to Nth battery groups are connected in parallel, and the Mth battery group is hung on the DC bus through the Mth battery group switch; the intelligent discharge maintenance module includes intelligent discharge loads and the first to Nth discharge switches, and the intelligent discharge load passes through the Mth discharge switch Connected to the Mth battery pack; the supplementary charging module includes a supplementary charging power supply and the first to Nth charging switches, and the supplementary charging power supply is connected to the Mth battery pack through the Mth charging switch; the battery inspection module includes a voltage acquisition unit and a switch control unit and an intelligent monitoring host, the voltage acquisition unit is used to collect the voltage of the first to Nth battery pack single battery, the switch control unit is used for the first to Nth battery pack switch, the first to Nth discharge switch, the first to Nth battery pack switch, the first to Nth discharge switch, The switching value acquisition and switching execution of the N charging switch, the intelligent monitoring host is used for data monitoring and command issuance of the voltage acquisition unit and the switch control unit, and the intelligent monitoring host is also used for starting and stopping the work of the intelligent discharge load; where N is a positive even number , 1≤M≤N.

When the AC power supply is normal, the first to Nth battery packs are charged through the DC bus, and the first to Nth battery packs can supply power to the DC bus and the feeder at the same time when the AC power is lost. The first to Nth battery packs share a supplementary charging power source and intelligent discharge load. During maintenance, the Mth battery pack is in a floating charge state, disconnect the switch of the Mth battery pack, close the Mth discharge switch, and start the smart discharge load. The battery pack is discharged to realize maintenance-free discharge of the Mth battery pack; the Mth charging switch is closed after the Mth battery pack is discharged, and the supplementary charging power is charged to the Mth battery pack to realize supplementary charging of the Mth battery pack. The charging and discharging of the Mth battery group is automatically controlled by the battery inspection module, and the 100% maintenance-free checking charging and discharging of the battery group of the DC power supply system is realized.

Preferably, the first to Nth discharge switches are interlocked, and the first to Nth charging switches are interlocked.

Only one discharge switch can be closed at the same time, and only one charging switch can be closed at the same time. At the same time, only one battery pack can be maintained. When the AC power is lost, the non-maintenance battery pack can supply power to the DC bus and feeder at the same time.

Preferably, it also includes first to Nth diodes, and the Mth diode is connected in parallel with the switch of the Mth battery pack.

The Mth diode and the Mth battery pack switch form the Mth uninterruptible power supply module. When the system is running normally, the first to Nth battery pack switches are closed. At this time, the DC bus charges the battery pack through the Mth battery pack switch. The Mth battery pack supplies power to the DC bus and feeder through the Mth battery pack switch; disconnect the Mth battery pack switch during discharge maintenance, the DC bus will no longer charge the Mth battery pack, and the Mth battery pack can pass through when the AC power fails. The Mth diode supplies power to the DC bus and the feeder to realize uninterrupted power supply.

Preferably, N=2, M=1 or 2.

The new intelligent DC power supply maintenance method of the substation described in the present invention is applied to the above-mentioned new intelligent DC power supply system of the substation, and the maintenance method of the Mth battery pack includes the following steps:

Step S1, the intelligent monitoring host monitors whether the Mth battery pack is floating-charged, and if so, enters step S2;

Step S2, the intelligent monitoring host sends an instruction to the switch control unit to control the switch of the Mth battery pack to be disconnected;

Step S3, after the intelligent monitoring host monitors that the switch of the Mth battery pack is disconnected, it sends an instruction to the switch control unit to control the closing of the Mth discharge switch;

Step S4, after the intelligent monitoring host detects that the Mth discharge switch is closed, it starts the intelligent discharge load to realize the discharge function of the Mth battery pack;

Step S5, the intelligent monitoring host monitors whether the Mth battery pack reaches the discharge cut-off condition, and if the smart discharge load is stopped and the discharge function of the Mth battery pack is completed, an instruction is issued to the switch control unit to control the Mth discharge switch to be disconnected;

Step S6, after the intelligent monitoring host monitors that the Mth discharge switch is disconnected, it sends an instruction to the switch control unit to control the Mth charging switch to be closed, so as to realize the charging function of the Mth battery pack;

Step S7, the intelligent monitoring host monitors whether the Mth battery pack is fully charged, and if so, sends an instruction to the switch control unit to control the Mth charging switch to be disconnected, and completes the charging function of the Mth battery pack;

Step S8, after the intelligent monitoring host monitors that the Mth charging switch is disconnected, it sends an instruction to the switch control unit to control the switch of the Mth battery pack to be closed, and restore the system to normal.

Compared with the prior art, the present invention has the following beneficial effects:

The new intelligent DC power supply system of the substation described in the present invention can realize the 100% maintenance-free charging and discharging function of the single-electric single-charge battery pack, and the system can automatically perform 100% nuclear capacity charging and discharging maintenance on a regular basis, without the need for operation and maintenance personnel to go to the site for nuclear capacity To work, you only need to go to the site to check the automatic maintenance results. If there is a channel, you can check the automatic maintenance results at the master station.

The new intelligent DC power supply system of the substation described in the present invention can automatically judge whether the storage battery pack is in the floating charging state before discharging, and only in the floating charging state can automatic discharge be performed for maintenance, and the discharge will be stopped immediately after the AC power failure, and the storage battery pack can be charged to the load through the diode. Power supply to ensure uninterrupted DC power supply when AC power is lost. Non-maintenance battery packs can supply power normally, improving system safety and reliability.

The novel intelligent DC power supply maintenance method for substations described in the present invention can realize the 100% maintenance-free charging and discharging function of the single-power single-charge battery pack, and can automatically perform 100% nuclear capacity charging and discharging maintenance on a regular basis, without the need for operation and maintenance personnel to go to the site for nuclear capacity To work, you only need to go to the site to check the automatic maintenance results. If there is a channel, you can check the automatic maintenance results at the master station.

The new intelligent DC power supply maintenance method for substations described in the present invention automatically judges whether the battery pack is in a floating charge state before discharging, and only in the floating charge state can automatic discharge be performed for maintenance, and the discharge is stopped immediately after the AC power failure, and the battery pack can be charged to the battery through a diode. Load power supply to ensure DC uninterrupted power supply in case of AC power failure. Non-maintenance battery packs can supply power normally, improving system safety and reliability.

Description of drawings

Fig. 1 is a schematic diagram of a DC power supply system of a single series battery pack according to the present invention;

Fig. 2 is a structural block diagram of a novel intelligent DC power supply system in a substation according to Embodiment 2 of the present invention;

Fig. 3 is a flow chart of the method for maintaining the first battery pack of the new intelligent DC power supply in the substation according to Embodiment 4 of the present invention;

Fig. 4 is a flow chart of the method for maintaining the second battery pack of the new intelligent DC power supply in the substation according to Embodiment 4 of the present invention.

Among them, 1, the first battery pack; 101, the first battery pack switch; 102, the first discharge switch; 103, the first charging switch; 104, the first diode; 2, the second battery pack; 201, the second Battery pack switch; 202, second discharge switch; 203, second charging switch; 204, second diode; 3, intelligent discharge load; 4, supplementary charging power supply; 401, supplementary switch; 5, battery inspection module.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Example 1

A novel intelligent DC power supply system for a substation according to the present invention includes a DC busbar and a feeder, and also includes first to Nth battery packs, switches for the first to Nth battery packs, an intelligent discharge maintenance module, a supplementary charging module, and battery inspection Module 5, the first to Nth battery packs are connected in parallel, and the Mth battery pack is hung on the DC bus through the Mth battery pack switch; the intelligent discharge maintenance module includes intelligent discharge load 3 and the first to Nth discharge switches, intelligent discharge load 3 Connect to the M battery pack through the Mth discharge switch; the supplementary charging module includes a supplementary charging power supply 4 and the first to Nth charging switches, and the supplementary charging power supply 4 is connected to the Mth battery pack through the Mth charging switch; the battery inspection module 5 It includes a voltage acquisition unit, a switch control unit and an intelligent monitoring host. The voltage acquisition unit is used to collect the voltage of a single battery in the first to Nth battery packs. The switch control unit is used to switch the first to Nth battery packs, The N discharge switch and the first to Nth charging switches are used for switching value acquisition and switching execution. The intelligent monitoring host is used for data monitoring and command issuance of the voltage acquisition unit and switch control unit. The intelligent monitoring host is also used for starting and stopping intelligent discharge. Load 3 works; where N is a positive even number, 1≤M≤N.

The first to Nth discharge switches are interlocked, and the first to Nth charging switches are interlocked. Only one discharge switch can be closed at the same time, and only one charging switch can be closed at the same time. At the same time, only one battery pack can be maintained. When the AC power is lost, the non-maintenance battery pack can supply power to the DC bus and feeder at the same time.

It also includes first to Nth diodes, and the Mth diode is connected in parallel with the switch of the Mth battery pack. The Mth diode and the Mth battery pack switch form the Mth uninterruptible power supply module. When the system is running normally, the first to Nth battery pack switches are closed. At this time, the DC bus charges the battery pack through the Mth battery pack switch. The Mth battery pack supplies power to the DC bus and feeder through the Mth battery pack switch; disconnect the Mth battery pack switch during discharge maintenance, the DC bus will no longer charge the Mth battery pack, and the Mth battery pack can pass through when the AC power fails. The Mth diode supplies power to the DC bus and the feeder to realize uninterrupted power supply.

When the AC power supply is normal, the first to Nth battery packs are charged through the DC bus, and the first to Nth battery packs can supply power to the DC bus and the feeder at the same time when the AC power is lost. The first to Nth battery packs share a supplementary charging power source 4 and intelligent discharge load 3. During maintenance, the Mth battery pack is in a floating charge state, disconnect the Mth battery pack switch, close the Mth discharge switch, and start the smart discharge load 3 to work , the Mth storage battery pack is discharged to realize maintenance-free discharge of the Mth storage battery pack; the Mth charging switch is closed after the Mth storage battery pack is discharged, and the supplementary charging power supply 4 charges the Mth storage battery pack to realize supplementary charging of the Mth storage battery pack. The charging and discharging of the Mth storage battery group is automatically controlled by the battery inspection module 5 to realize 100% maintenance-free checking charging and discharging of the storage battery group of the DC power supply system. The intelligent monitoring host monitors the voltage of the single battery of the Mth battery pack collected by the voltage acquisition unit to determine whether the Mth battery pack is floating-charged, whether it reaches the discharge cut-off condition, and whether it is fully charged.

The supplementary charging power supply 4 can also be hung on the DC bus through the supplementary switch 401 , and the DC bus can charge the supplementary charging power supply 4 through the supplementary switch 401 when the AC power supply is normal.

N groups of small-capacity battery groups are connected in parallel to replace the existing N/2 groups of battery groups in series. Each group of batteries is connected to the DC bus through an uninterrupted power supply module. Or the problem that several groups of batteries are open and cause the system to lose power.

Discharge maintenance can be carried out on a regular basis every six months or a year to achieve manual maintenance-free.

Example 2

As shown in Figure 2, a novel intelligent DC power supply system for a substation according to the present invention includes a DC busbar and a feeder, and also includes a first battery pack 1 and a second battery pack 2, a first battery pack switch 101 and a second battery pack Switch 201, intelligent discharge maintenance module, supplementary charging module, battery inspection module 5, the first battery pack 1 and the second battery pack 2 are connected in parallel, and the first battery pack 1 or the second battery pack 2 is connected through the first battery pack switch 101 or The second battery pack switch 201 is hung on the DC bus; the intelligent discharge maintenance module includes an intelligent discharge load 3 and a first discharge switch 102 and a second discharge switch 202, and the intelligent discharge load 3 passes through the first discharge switch 102 or the second discharge switch 202 Connected to the first or second storage battery pack 2; the supplementary charging module includes a supplementary charging power supply 4 and a first charging switch 103 and a second charging switch 203, and the supplementary charging power supply 4 is connected to the first charging switch 103 or the second charging switch 203 The first battery pack 1 or the second battery pack 2; the battery inspection module 5 includes a voltage acquisition unit, a switch control unit and an intelligent monitoring host, the voltage acquisition unit is used to collect the voltage of the first and second battery pack 2 single cells, The switch control unit is used for switching value acquisition and switching execution of the first battery pack switch 101 and the second battery pack switch 201, the first discharge switch 102 and the second discharge switch 202, the first charging switch 103 and the second charging switch 203 , the intelligent monitoring host is used for data monitoring and instruction issuance of the voltage acquisition unit and the switch control unit, and the intelligent monitoring host is also used for starting and stopping the intelligent discharge load 3 .

The first discharge switch 102 and the second discharge switch 202 are interlocked, and the first charge switch 103 and the second charge switch 203 are interlocked. Only one discharge switch can be closed at the same time, and only one charging switch can be closed at the same time. At the same time, only the first battery pack 1 or the second battery pack 2 can be maintained. The battery pack 1 can supply power to the DC bus and the feeder.

It also includes a first diode 104 and a second diode 204 , and the first diode 104 or the second diode 204 is connected in parallel with the first battery pack switch 101 or the second battery pack switch 201 . The first diode 104 or the second diode 204 and the first battery pack switch 101 or the second battery pack switch 201 form the first uninterruptible power supply module or the second uninterruptible power supply module. When the system is in normal operation, the first battery pack The switch 101 and the second battery pack switch 201 are closed. At this time, the DC bus charges the battery pack through the first battery pack switch 101 or the second battery pack switch 201. When the AC power is lost, the first battery pack 1 or the second battery pack 2 passes through The first battery switch 101 or the second battery switch 201 supplies power to the DC bus and feeder; when performing discharge maintenance, the first battery switch 101 or the second battery switch 201 is disconnected, and the DC bus no longer supplies the first battery 1 Or the second battery pack 2 is charged. When the AC power fails, the first battery pack 1 or the second battery pack 2 can supply power to the DC bus and feeder through the first diode 104 or the second diode 204 to realize uninterrupted power supply.

When the AC power supply is normal, the first battery pack 1 and the second battery pack 2 are charged through the DC bus, and the first battery pack 1 and the second battery pack 2 can simultaneously supply power to the DC bus and the feeder when the AC power fails. The first storage battery group 1 and the second storage battery group 2 share a supplementary charging power source 4 and an intelligent discharge load 3. During maintenance, the first storage battery group 1 or the second storage battery group 2 is in a state of floating charging, and the first storage battery group switch 101 or The second battery pack switch 201 closes the first discharge switch 102 or the second discharge switch 202, starts the intelligent discharge load 3 to work, discharges the first battery pack 1 or the second battery pack 2, and realizes the first battery pack 1 or the second battery pack Group 2 maintenance-free discharge; the first battery group 1 or the second battery group 2 is discharged and the first charging switch 103 or the second charging switch 203 is closed, and the charging power supply 4 is charged to the first battery group 1 or the second battery group 2, Supplementary charging of the first storage battery pack 1 or the second storage battery pack 2 is carried out. The charging and discharging of the first storage battery pack 1 or the second storage battery pack 2 is automatically controlled by the battery inspection module 5 to complete the maintenance. The intelligent monitoring host monitors the voltage of the single battery of the first battery pack 1 or the second battery pack 2 collected by the voltage acquisition unit to determine whether the first or second battery pack 2 is floating-charged, whether it reaches the discharge cut-off condition, and whether it is fully charged.

The supplementary charging power supply 4 can also be hung on the DC bus through the supplementary switch 401 , and the DC bus can charge the supplementary charging power supply 4 through the supplementary switch 401 when the AC power supply is normal.

Two groups of small-capacity battery groups are connected in parallel to replace the existing single group of battery groups in series. Each group of batteries is connected to the DC bus through an uninterrupted power supply module. A problem that causes the system to lose power.

Discharge maintenance can be carried out on a regular basis every six months or a year to achieve manual maintenance-free.

Example 3

The new intelligent DC power supply maintenance method of the substation of the present invention is applied to the new intelligent DC power supply system of the substation described in Embodiment 1, and the maintenance method of the Mth battery pack includes the following steps:

Step S1, the intelligent monitoring host monitors whether the Mth battery pack is floating-charged, and if so, enters step S2;

Step S2, the intelligent monitoring host sends an instruction to the switch control unit to control the switch of the Mth battery pack to be disconnected;

Step S3, after the intelligent monitoring host monitors that the switch of the Mth battery pack is disconnected, it sends an instruction to the switch control unit to control the closing of the Mth discharge switch;

Step S4, after the intelligent monitoring host monitors that the Mth discharge switch is closed, it starts the intelligent discharge load 3 to work and realizes the discharge function of the Mth battery pack;

Step S5, the intelligent monitoring host monitors whether the Mth battery pack reaches the discharge cut-off condition, and if the smart discharge load 3 is stopped and the discharge function of the Mth battery pack is completed, an instruction is sent to the switch control unit to control the Mth discharge switch to be disconnected;

Step S6, after the intelligent monitoring host monitors that the Mth discharge switch is disconnected, it sends an instruction to the switch control unit to control the Mth charging switch to be closed, so as to realize the charging function of the Mth battery pack;

Step S7, the intelligent monitoring host monitors whether the Mth battery pack is fully charged, and if so, sends an instruction to the switch control unit to control the Mth charging switch to be disconnected, and completes the charging function of the Mth battery pack;

Step S8, after the intelligent monitoring host monitors that the Mth charging switch is disconnected, it sends an instruction to the switch control unit to control the switch of the Mth battery pack to be closed, and restore the system to normal.

In step S5, when the intelligent monitoring host monitors whether the Mth storage battery reaches the discharge cut-off condition, there are two situations: one is that the Mth storage battery completes discharging, and the other is that the Mth storage battery supplies power to the load through a diode due to AC failure. In any case, the discharge cut-off condition can be reached.

Example 4

The maintenance method of the novel intelligent DC power supply of the substation of the present invention is applied to the novel intelligent DC power supply system of the substation described in Embodiment 2. As shown in Figure 3, the maintenance method for the first battery pack 1 includes the following steps:

Step S1, the intelligent monitoring host monitors whether the first battery pack 1 is floating-charged, and if so, enters step S2;

Step S2, the intelligent monitoring host sends an instruction to the switch control unit to control the first battery pack switch 101 to be disconnected;

Step S3, after the intelligent monitoring host monitors that the first battery pack switch 101 is disconnected, it sends an instruction to the switch control unit to control the first discharge switch 102 to close;

Step S4, after the intelligent monitoring host detects that the first discharge switch 102 is closed, it starts the intelligent discharge load 3 to work and realizes the discharge function of the first battery pack 1;

Step S5, the intelligent monitoring host monitors whether the first storage battery pack 1 reaches the discharge cut-off condition, and if the smart discharge load 3 is stopped and the discharge function of the first storage battery pack 1 is completed, an instruction is sent to the switch control unit to control the first discharge switch 102 to be turned off. open;

Step S6, after the intelligent monitoring host monitors that the first discharge switch 102 is disconnected, it sends an instruction to the switch control unit to control the first charging switch 103 to close, so as to realize the charging function of the first battery pack 1;

Step S7, the intelligent monitoring host monitors whether the first battery pack 1 is fully charged, and if it sends an instruction to the switch control unit to control the first charging switch 103 to be disconnected, the charging function of the first battery pack 1 is completed;

Step S8 , after the intelligent monitoring host monitors that the first charging switch 103 is disconnected, it sends an instruction to the switch control unit to control the first battery pack switch 101 to close, and restore the system to normal.

As shown in Figure 4, the maintenance method for the second battery pack 2 includes the following steps:

Step S1, the intelligent monitoring host monitors whether the second battery pack 2 is floating-charged, and if so, enters step S2;

Step S2, the intelligent monitoring host issues an instruction to the switch control unit to control the second battery pack switch 201 to be disconnected;

Step S3, after the intelligent monitoring host monitors that the second battery pack switch 201 is disconnected, it sends an instruction to the switch control unit to control the second discharge switch 202 to close;

Step S4, after the intelligent monitoring host detects that the second discharge switch 202 is closed, it starts the intelligent discharge load 3 to work and realizes the discharge function of the second battery pack 2;

Step S5, the intelligent monitoring host monitors whether the second battery pack 2 reaches the discharge cut-off condition, and if the smart discharge load 3 is stopped and the discharge function of the second battery pack 2 is completed, an instruction is sent to the switch control unit to control the second discharge switch 202 to be turned off. open;

Step S6, after the intelligent monitoring host monitors that the second discharging switch 202 is disconnected, it sends an instruction to the switch control unit to control the closing of the second charging switch 203 to realize the charging function of the second battery pack 2;

Step S7, the intelligent monitoring host monitors whether the second storage battery pack 2 is fully charged, and if it sends an instruction to the switch control unit to control the second charging switch 203 to be disconnected, the charging function of the second storage battery pack 2 is completed;

Step S8 , after the intelligent monitoring host monitors that the second charging switch 203 is disconnected, it sends an instruction to the switch control unit to control the second battery pack switch 201 to close, and restore the system to normal.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. All equal modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the present invention. covered by the patent.

Claims (5)

1. The utility model provides a novel intelligent DC power supply system of transformer substation, includes direct current bus and feeder, its characterized in that: the intelligent charging system also comprises first to Nth storage battery packs, first to Nth storage battery pack switches, an intelligent discharging maintenance module, a supplementary charging module and a storage battery inspection module (5), wherein the first to Nth storage battery packs are connected in parallel, and the Mth storage battery pack is hung on a direct-current bus through the Mth storage battery pack switch; the intelligent discharging maintenance module comprises an intelligent discharging load (3) and first to Nth discharging switches, wherein the intelligent discharging load (3) is connected to the Mth storage battery pack through the Mth discharging switch; the complementary charging module comprises a complementary charging power supply (4) and first to Nth charging switches, wherein the complementary charging power supply (4) is connected to the Mth storage battery pack through the Mth charging switch; the storage battery inspection module (5) comprises a voltage acquisition unit, a switch control unit and an intelligent monitoring host, wherein the voltage acquisition unit is used for acquiring the voltages of single batteries of first to Nth storage battery packs, the switch control unit is used for acquiring the switching values of the first to Nth storage battery packs, the first to Nth discharge switches and the first to Nth charge switches and executing the switching, the intelligent monitoring host is used for monitoring the data and issuing the instructions of the voltage acquisition unit and the switch control unit, and the intelligent monitoring host is also used for starting and stopping the intelligent discharge load (3) to work; wherein N is a positive even number, and M is more than or equal to 1 and less than or equal to N;

the battery pack further comprises first to Nth diodes, and the Mth diode is connected with the Mth battery pack switch in parallel.

2. The novel intelligent substation direct-current power supply system of claim 1, characterized in that: the first to Nth discharging switches are interlocked, and the first to Nth charging switches are interlocked.

3. The novel intelligent direct current power supply system of transformer substation of claim 1, characterized in that: the intelligent monitoring host monitors the voltage of the single battery of the Mth storage battery pack collected by the voltage collecting unit to judge whether the Mth storage battery pack is floated and charged, whether a discharging cut-off condition is achieved or not and whether the storage battery pack is fully charged or not.

4. The novel intelligent direct current power supply system of transformer substation of claim 3, characterized in that: n =2,m =1 or 2.

5. A novel intelligent direct-current power supply maintenance method for a transformer substation is applied to the novel intelligent direct-current power supply system for the transformer substation of any one of claims 1 to 4, and is characterized in that: the Mth storage battery pack maintenance method comprises the following steps:

s1, monitoring whether an Mth storage battery pack is subjected to floating charge or not by an intelligent monitoring host, and if yes, entering S2;

s2, the intelligent monitoring host sends an instruction to the switch control unit to control the switch of the Mth storage battery pack to be switched off;

s3, after monitoring that the Mth storage battery pack switch is disconnected, the intelligent monitoring host sends an instruction to the switch control unit to control the Mth discharge switch to be closed;

s4, after monitoring that the Mth discharge switch is closed, the intelligent monitoring host starts an intelligent discharge load (3) to work to realize the discharge function of the Mth storage battery pack;

s5, the intelligent monitoring host monitors whether the Mth storage battery pack reaches a discharge cut-off condition, and if the Mth storage battery pack stops working and finishes the discharge function of the Mth storage battery pack, the intelligent monitoring host issues an instruction to control the Mth discharge switch to be switched off to the switch control unit;

s6, after monitoring that the Mth discharge switch is disconnected, the intelligent monitoring host sends an instruction to the switch control unit to control the Mth charging switch to be closed so as to realize the charging function of the Mth storage battery pack;

s7, monitoring whether the Mth storage battery pack is fully charged or not by the intelligent monitoring host, and if yes, issuing an instruction to control the Mth charging switch to be switched off to complete the charging function of the Mth storage battery pack;

and S8, after the intelligent monitoring host monitors that the Mth charging switch is disconnected, the intelligent monitoring host sends an instruction to the switch control unit to control the Mth storage battery to be switched on and switched off and restore the system to be normal.

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