CN114865770A - Centralized UPS power supply system for rail transit - Google Patents

Abstract

The invention discloses a centralized UPS power supply system for rail transit, which relates to the field of UPS power supplies and comprises the following components: the super capacitor cabinet is used for storing direct current electric energy for the UPS and controlling the charging and discharging of the UPS to the super capacitor; the UPS main cabinet comprises a UPS, a super capacitor CMS management system and a control module, wherein the UPS is in communication connection with the super capacitor CMS management system and is used for responding to a control signal generated by the super capacitor CMS management system in real time; the input switch cabinet is used for accessing mains supply and inputting electric energy into the UPS main cabinet, and when the mains supply is normal, the electric energy is input into the centralized output monitoring cabinet while the super capacitor is charged by the UPS main cabinet so as to supply power to each rail transit subsystem electrically connected with the centralized output monitoring cabinet; when the mains supply is abnormal, the super capacitor is discharged through the UPS main machine cabinet, and the electric energy output by the super capacitor is used for supplying power to each rail transit subsystem, so that the centralized integration of the UPS main machine and the storage battery in each professional power supply system is realized, and a large amount of resources are saved.

Description

A centralized UPS power system for rail transit

technical field

The invention relates to the field of UPS power supply, in particular to a centralized UPS power supply system for rail transit.

Background technique

The urban rail transit station contains numerous weak current systems, such as communication, signal, integrated monitoring, access control, automatic ticket collection, automatic fire alarm, screen door, emergency lighting, substation integrated automation and other rail transit subsystems. These systems belong to the first class. The load requires a highly reliable UPS power supply to ensure the quality of the power supply and the continuity of the power supply. At present, most of them adopt a decentralized power supply method, that is, each rail transit subsystem is equipped with an independent UPS power supply, each system is relatively independent, and the UPS power is small. Low-power UPS is designed to consider low-cost (especially power and control parts) factors, so the requirements for component selection, system redundancy, and power device tolerance levels are relatively low, so small Power UPS is relatively poor in reliability, stability and life, while high-power UPS has higher requirements for reliability, safety, redundancy and component selection in design.

The failure of any low-power UPS may affect the normal operation of the subway. The decentralized setting method cannot realize resource sharing. There are repeated equipment configuration, low utilization rate, large floor space, and high investment cost for underground space development, which is not economically viable. Reasonable and other shortcomings, at the same time, the operation department of each rail transit subsystem must be equipped with power supply maintenance tools and professional maintenance personnel, and each carries out independent power management, while the maintenance and repair of traditional tower power frequency UPS is more difficult, requiring manufacturers to after-sales Only engineers can carry out maintenance and repair, which also increases the cost of operation and maintenance and waste of human resources to the subway operation. In addition, although the traditional lead-acid battery has been used for decades, its short life, large volume and high maintenance cost make it difficult to meet the requirements of rail transit applications. The centralized hardware integration of UPS host and battery, and the use of new energy storage in UPS applications are urgent problems to be solved.

SUMMARY OF THE INVENTION

In order to maintain and manage various professional power supply systems (subsystems of rail transit) in a unified manner, the centralized arrangement of each professional power supply system is carried out to reduce the area of equipment room, reduce the cost of civil engineering of the station, reduce the repeated configuration of equipment, realize resource sharing, and save equipment. Investment, unifying the selection of power supply brands and improving the convenience of equipment bidding, the present invention proposes a centralized UPS power supply system for rail transit, including: a super capacitor cabinet, an input switch cabinet, and a UPS main cabinet that are electrically connected in sequence With centralized output monitoring cabinet, which:

The super capacitor cabinet is used to store DC power for the UPS; it includes the super capacitor and the super capacitor CMS management system, the super capacitor CMS management system is used to monitor the parameter data of the super capacitor, and generate a control signal according to the parameter data to control the UPS Charging and discharging of supercapacitors;

The UPS main cabinet, including the UPS, is connected in communication with the supercapacitor CMS management system for real-time response to control signals generated by the supercapacitor CMS management system;

The input switch cabinet is used to connect to the mains and input the electric energy into the UPS main cabinet. When the mains power supply is normal, the super capacitor is charged through the UPS main cabinet and the electric energy is input into the centralized output monitoring cabinet, so as to be connected with the centralized control cabinet. The output monitoring cabinet is electrically connected to supply power to each rail transit subsystem; and when the mains power supply is abnormal, the super capacitor is discharged through the UPS main cabinet to supply power to each rail transit subsystem through the electric energy output by the super capacitor.

Further, the input switch cabinet includes:

DC busbar, UPS DC main switch, AC busbar, UPS main power input switch;

One end of the DC busbar is connected to the super capacitor cabinet, and the other end is connected to the UPS main cabinet through the UPS DC main switch; the AC busbar is connected to the commercial power, and the UPS main cabinet is connected to the AC through the UPS main power input switch. busbar connection.

Further, the UPS main cabinet includes:

Several power modules, each of which includes DC/DC, AC/DC, and DC/AC power conversion units, and the power modules are used to convert the power supply through the AC/DC power conversion unit when the commercial power supply is normal. After the commercial power is converted into DC power, the super capacitor is charged through the DC/DC power conversion unit; when the power supply of the commercial power is abnormal, the DC power of the super capacitor is released. /AC power conversion unit converts DC power into AC power, which is input to the centralized output monitoring cabinet for use by each rail transit subsystem.

Further, the input switch cabinet further includes a UPS bypass input switch connected to the AC busbar; the UPS main cabinet further includes a bypass switching module; the UPS bypass input switch is connected to the bypass switching module;

The UPS bypass output switch is turned on when the power module fails, so as to input the commercial power into the bypass switching module and then into the centralized output monitoring cabinet to supply power to each rail transit subsystem.

Further, the UPS main cabinet is also provided with an overhaul bypass switch connected to the UPS bypass input switch, which is used to turn on when the UPS main cabinet needs to be overhauled, so as to directly input the mains into the centralized output monitoring cabinet.

Further, the input switch cabinet also includes a UPS external maintenance bypass switch connected to the AC busbar, which is electrically connected to the centralized output monitoring cabinet, and is used to conduct electricity when the UPS main cabinet fails to Electricity is directly input into the centralized output monitoring cabinet.

Further, the supercapacitor CMS management system includes:

a monitoring unit for monitoring parameter data of the super capacitor, the parameter data including: the voltage of the capacitor cell;

a signal generating unit, configured to generate a charge prohibition signal when the monitored capacitor cell voltage is greater than or equal to a preset maximum charging voltage; and when the monitored capacitor cell voltage is less than or equal to a preset minimum discharge voltage, generate a discharge prohibition signal;

The UPS is also used to interrupt the UPS DC main switch through the supercapacitor CMS management system to stop charging the supercapacitor when receiving a charge prohibition signal; when receiving a discharge prohibition signal, interrupt the UPS DC through the supercapacitor CMS management system The main switch is used to stop the power input into the centralized output monitoring cabinet to interrupt the power supply to each rail transit subsystem electrically connected to the centralized output monitoring cabinet

Further, the centralized output monitoring cabinet includes:

AC bus, several feeder loop switches connected to the AC bus, and a time-sharing power-off module connected to the feeder loop switch;

The one feeder loop switch is correspondingly connected to one rail transit subsystem; each rail transit subsystem is connected to the AC bus through its corresponding feeder loop switch;

The time-sharing power-off module is used to set the on-time duration of each feeder circuit switch when the mains power supply is abnormal, so as to respectively limit the duration of power supply to each rail transit subsystem by the electric energy output by the super capacitor.

Further, the input switch cabinet also includes:

The dual power switch is used to control the mains input at the preset first power source or the preset second power source.

Further, the power module is a high-frequency IGBT power module.

Compared with the prior art, the present invention at least contains the following beneficial effects:

(1) In the present invention, when the mains power supply is normal, the super capacitor is charged by the UPS main cabinet, and the electric energy is input into the centralized output monitoring cabinet, so as to supply power to each rail transit subsystem electrically connected with the centralized output monitoring cabinet; and When the mains power supply is abnormal, the super capacitor is discharged through the UPS main cabinet to supply power to each rail transit subsystem through the electric energy output by the super capacitor, which realizes the centralized integration of the UPS main machine and the battery in each professional power system. Completed the unified maintenance and management of various professional power supply systems, reduced the cost of operation and maintenance, reduced the repeated configuration of equipment, and realized resource sharing;

(2) The present invention realizes the replacement of lead-acid batteries through the application of supercapacitors. Since the capacity decay rate of supercapacitors is extremely low, the number of times of charging and discharging is as high as 10,000 times or more, thus greatly improving the performance of the UPS power system. overall life;

(3) The UPS main cabinet in the present invention includes several power modules, and the power modules are high-frequency IGBT power modules, which support online hot swapping, which shortens the power supply maintenance time of rail transit, and the efficiency of the UPS is as high as 95%. , more energy-saving, and the loss is reduced by more than 10% compared with the traditional power frequency UPS (traditional phase-controlled rectification power frequency UPS has low efficiency, large harmonics, and high energy consumption);

(4) The present invention can be powered off according to different rail transit subsystems in a time-sharing manner, rationally utilize the electric energy of the super capacitor, and supply power to each rail transit subsystem through the electric energy output by the super capacitor during the backup time (that is, when the mains power supply is abnormal). time) is reserved for more important loads, saving user investment;

(5) In the present invention, a dual power supply switch is arranged in the input switch cabinet to control the mains input at the preset first power supply or the preset second power supply, that is, when the preset first power supply is abnormal, the The dual power switch is switched to the preset second power supply, and when the preset second power supply is abnormal, the dual power switch can be switched to the preset first power supply, which further improves the safety, reliability and power supply of electricity. continuity.

Description of drawings

Fig. 1 is a system schematic diagram of a centralized UPS power supply system for rail transit;

Fig. 2 is a system power supply wiring diagram of a centralized UPS power supply system for rail transit;

Figure 3 is the outline drawing of the input switch cabinet, the UPS main cabinet and the centralized output monitoring cabinet;

Figure 4 is the outline drawing of the super capacitor cabinet.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

Example 1

In order to realize the centralized integration of the UPS host and battery in each professional power system, complete the unified maintenance and management of each professional power system, reduce the cost of operation and maintenance, reduce the repeated configuration of equipment, and realize resource sharing, as shown in Figure 1 and Figure 2 As shown, the present invention proposes a centralized UPS power supply system for rail transit, including: a super capacitor cabinet, an input switch cabinet, a UPS main cabinet and a centralized output monitoring cabinet that are electrically connected in sequence, wherein:

The super capacitor cabinet is used to store DC power for the UPS; it includes the super capacitor and the super capacitor CMS management system, the super capacitor CMS management system is used to monitor the parameter data of the super capacitor, and generate a control signal according to the parameter data to control the UPS Charging and discharging of supercapacitors;

Specifically, the super capacitor includes a super capacitor cell; the super capacitor cell is more than 50,000 farads, several super capacitor cells are connected in parallel to form a capacitor block, several capacitor blocks are connected in series to form a capacitor module, and several capacitor modules are connected in series to form a capacitor module. Group to form a super capacitor cabinet (the entire super capacitor cabinet may include No. 1 super capacitor cabinet (referred to as "capacitor cabinet 1"), No. 2 super capacitor cabinet (referred to as "capacitor cabinet 2")... Super capacitor cabinet No. N (referred to as "capacitor cabinet N"), see Figure 1), in this embodiment, each super capacitor cabinet is equipped with a super capacitor CMS management system; the total voltage of the entire super capacitor cabinet after charging is above 400V, and the total power of a single cabinet is 8kWH Above, the number of super capacitor cabinets is calculated and configured according to the user's load power.

The UPS main cabinet, including the UPS, is connected in communication with the super capacitor CMS management system, and is used to respond to the control signal generated by the super capacitor CMS management system in real time, that is, the UPS adopts a passive working mode;

It should be noted that the communication between the UPS main cabinet and the super capacitor CMS management system includes at least two communication methods: RS485 data communication and dry contact. When the RS485 data communication between the UPS and the super capacitor CMS management system is lost, the UPS can also communicate through dry contact. The contacts communicate with the supercapacitor CMS.

The input switch cabinet is used to connect to the mains and input the electric energy into the UPS main cabinet. When the mains power supply is normal, the super capacitor is charged through the UPS main cabinet and the electric energy is input into the centralized output monitoring cabinet, so as to be connected with the centralized control cabinet. The output monitoring cabinet is electrically connected to supply power to each rail transit subsystem; and when the mains power supply is abnormal, the super capacitor is discharged through the UPS main cabinet to supply power to each rail transit subsystem through the electric energy output by the super capacitor.

The UPS main cabinet is also used for real-time monitoring of the state of the mains (the state includes normal power supply and abnormal power supply), whether the mains is normal is converted into a control signal for power supply switching according to the real-time monitoring of the mains state by the UPS mainframe, By presetting a standard voltage range of the mains, when the mains voltage is within the standard voltage range, the UPS main cabinet will charge the super capacitor and at the same time input the electric energy into the centralized output monitoring cabinet, when the mains voltage exceeds the standard voltage range of the mains , discharge the super capacitor through the UPS main cabinet.

In the present invention, when the super capacitor is charged, it also includes the logic control of closing/disconnecting the switch of the capacitor module, specifically: first closing the capacitor module with the lowest power to charge it, and waiting until it is fully charged and the second lowest When the power of the capacitor modules is the same, close the switch of the second capacitor module, the first and second capacitor modules are charged together to the same power as the third low-capacitance module, close the switch of the third capacitor module, and so on. , so that the electric energy in each capacitor module is consistent, and the balanced control of charging is realized. The balance control also includes: detecting the cell voltage of each capacitor cell through the super capacitor CMS management system, and when the cell voltage exceeds the preset range of the voltage average value of the corresponding capacitor module, the CMS management system will control the cell to perform discharge, so as to balance the electric energy of each capacitor cell in the capacitor module.

The UPS main cabinet includes:

Several power modules, each of which includes DC/DC, AC/DC, and DC/AC power conversion units, and the power modules are used to convert the power supply through the AC/DC power conversion unit when the commercial power supply is normal. After the commercial power is converted into DC power, the super capacitor is charged through the DC/DC power conversion unit; when the power supply of the commercial power is abnormal, the DC power of the super capacitor is released. /AC power conversion unit converts DC power into AC power, which is input to the centralized output monitoring cabinet for use by each rail transit subsystem. When the mains is abnormal, it switches to the DC power supply output of the super capacitor in 0ms to realize the continuous and uninterrupted power supply.

The power module is a high-frequency IGBT power module.

In this embodiment, the UPS main cabinet adopts a high-frequency modular structure model, each high-frequency IGBT power module is greater than 20KVA, and the power module adopts three-level inverter technology, from the whole machine to the components (power modules) The N+X redundant design makes the system more complete and reliable, and has the advantages of high efficiency, high power density, easy expansion, capacity expansion on demand and small footprint. The UPS main cabinet in the present invention can be installed with 2 to 10 modules with a power of more than 20kVA, and the maximum output power is more than 200kVA. In addition, the high-frequency IGBT power module can support online hot swapping (when the power module is abnormal, it can be manually operated, and the abnormal power module can be pulled out, and the whole operation will not affect the back-end load), maintenance is simple, and can be quickly implemented without professionals. Module replacement, maintenance and repair are completed, and the high-frequency IGBT power module has a module sleep function, and adopts a low-load cycle rest mode, which can effectively prolong the life of the system and improve the efficiency of the whole machine.

The input switch cabinet includes:

DC busbar, UPS DC main switch (QF5), AC busbar, UPS main power input switch (QF1);

One end of the DC busbar is connected to the super capacitor cabinet, and the other end is connected to the UPS main cabinet through the UPS DC main switch; the AC busbar is connected to the commercial power, and the UPS main cabinet is connected to the AC through the UPS main power input switch. busbar connection.

The input switch cabinet further includes a UPS bypass input switch (QF2) connected to the AC busbar; the UPS main cabinet further includes a bypass switching module; the UPS bypass input switch is connected to the bypass switching module;

The UPS bypass output switch is turned on when the power module fails, so as to input the commercial power into the bypass switching module and then into the centralized output monitoring cabinet to supply power to each rail transit subsystem.

The UPS main cabinet is also provided with an overhaul bypass switch (QF6) connected to the UPS bypass input switch, which is used to turn on when the UPS main cabinet needs to be overhauled, so as to directly input the mains into the centralized output monitoring cabinet.

The input switch cabinet also includes a UPS external maintenance bypass switch (QF3) connected to the AC busbar, which is electrically connected to the centralized output monitoring cabinet and used to conduct electricity when the UPS main cabinet fails to Electricity is directly input into the centralized output monitoring cabinet.

In this embodiment, the settings of the UPS bypass input switch, the bypass switching module, the maintenance bypass switch and the UPS external maintenance bypass switch make the system not lose power during the whole process of maintenance or failure. Improve the power stability, reliability and continuity of the power system.

The AC bus of the input switch cabinet is also provided with a C-level lightning arrester; the connection line between the input switch cabinet and the UPS main cabinet is also provided with a DC fast fuse, as shown in Figure 1.

The super capacitor CMS management system includes:

a monitoring unit for monitoring parameter data of the super capacitor, the parameter data including: the voltage of the capacitor cell;

a signal generating unit, configured to generate a charge prohibition signal when the monitored capacitor cell voltage is greater than or equal to a preset maximum charging voltage; and when the monitored capacitor cell voltage is less than or equal to a preset minimum discharge voltage, generate a discharge prohibition signal;

The UPS is also used to interrupt the UPS DC main switch through the supercapacitor CMS management system to stop the charging of the supercapacitor when receiving the charging prohibition signal (only when the "charging prohibition signal" disappears, the UPS can resume the charging function) ; When receiving the discharge prohibition signal, the UPS DC main switch is interrupted by the super capacitor CMS management system to stop the power input to the centralized output monitoring cabinet, so as to interrupt the power supply to each rail transit subsystem electrically connected to the centralized output monitoring cabinet.

In this embodiment, the UPS DC main switch is an automatic control switch with an electric supercharger, which is controlled by the supercapacitor CMS management system. When the signal generation unit in the supercapacitor CMS management system The UPS DC main switch is disconnected to stop the charging of the supercapacitor through the UPS.

The centralized output monitoring cabinet includes:

AC bus, several feeder loop switches (2QF1, 2QF2,,,, 2QFN, 2QFN+1) connected to the AC bus, and a time-sharing power-off module connected to the feeder loop switch;

The one feeder loop switch is correspondingly connected to one rail transit subsystem; each of the rail transit subsystems (system A, system B, system C, system D) is connected to the AC bus through its corresponding feeder loop switch;

The time-sharing power-off module is used to set the on-time duration of each feeder loop switch when the mains power supply is abnormal, so as to respectively limit the duration of power supply to each rail transit subsystem by the electric energy output by the super capacitor.

A transformer (TF1), a circuit breaker (QF4), and a manual switch (QF7) are arranged on the connection line between the centralized output monitoring cabinet and the UPS main cabinet. The specific settings are shown in Figure 1.

It should be noted that the feeder circuit switch is provided with a shunt release, which is controlled by the time-sharing power-off module, which determines and gives a trip signal according to a preset algorithm. Specific control: The backup time of each rail transit subsystem is set according to the requirements for the backup time of each rail transit subsystem in "GB50157-2013 Metro Design Specifications"; the initial state of the feeder circuit switch is the closed state. When a fault occurs, the time-sharing power-off module starts timing, and when the set power-off time of a rail transit subsystem is up, the time-sharing power-off module gives the rail transit subsystem the general open shunt trip signal to make the corresponding system The feeder loop switch is opened to stop the power supply, and the feeder loop switch that has not expired remains closed.

According to the time-sharing power-off of different rail transit subsystems, the present invention utilizes the electric energy of the super capacitor reasonably, and saves the backup time (that is, when the mains power supply is abnormal, the time for supplying power to each rail transit subsystem through the electric energy output by the super capacitor) Give more important loads, saving user investment.

The centralized output monitoring cabinet in the present invention also includes: a comprehensive monitoring host and a man-machine monitoring screen, and the man-machine monitoring screen adopts a 10-inch touch screen (with an Android operating system); the comprehensive monitoring host is used to centrally monitor the running state of the UPS main cabinet , Input the operating status of the switch cabinet, the parameter data and operating status of the super capacitor cabinet; the backup time of each rail transit subsystem in the time-sharing power-off module can be set through the man-machine monitoring screen (can be set within 1 to 9999 minutes); There is a system simulation flow chart on the man-machine monitoring screen. When the switch is disconnected, the UPS gives an alarm, and the super capacitor cabinet gives an alarm, an alarm reminder will pop up on the man-machine monitoring screen, and a sound and light alarm prompt will be issued at the same time. In addition, the integrated monitoring host It also saves historical alarm records; the integrated monitoring host also has a remote monitoring function, which adopts the BS architecture and can remotely monitor the status of the UPS main cabinet, super capacitor cabinet and feeder circuit switch through the TCP/IP protocol; The monitoring host is equipped with a SMS alarm module, which supports 4G SIM cards of telecom, mobile, and China Unicom operators. When the UPS main cabinet, super capacitor cabinet and feeder circuit switch are abnormal, the alarm information can be notified to the operation and maintenance personnel through SMS.

As shown in Figure 3 (the dimension unit in the figure is mm), the height of the input switch cabinet is not more than 2 meters, the depth is not more than 1 meter, and the width is not more than 0.6 meters; the centralized output monitoring cabinet adopts a server cabinet with a height of 2 meters , with a depth of 1 meter and a width of 0.6 meters. The height of the super capacitor cabinet is more than 2 meters, as shown in Figure 4.

The input switch cabinet also includes:

A dual power switch (ATS) is used to control the mains input at the preset first power source or the preset second power source.

By setting a dual power switch in the input switch cabinet to control the mains input at the preset first power supply or the preset second power supply, that is, when the preset first power supply is abnormal, it can be switched through the dual power switch To the preset second power supply, when the preset second power supply is abnormal, it can be switched to the preset first power supply through the dual power switch, which further improves the safety, reliability and continuity of power supply.

In the present invention, when the mains power supply is normal, the super capacitor is charged through the UPS main cabinet, and the electric energy is input into the centralized output monitoring cabinet, so as to supply power to each rail transit subsystem electrically connected with the centralized output monitoring cabinet; When the power supply is abnormal, the super capacitor is discharged through the UPS main cabinet to supply power to each rail transit subsystem through the electric energy output by the super capacitor. The unified maintenance and management of each professional power supply system reduces the cost of operation and maintenance, reduces the repeated configuration of equipment, and realizes resource sharing. In addition, the present invention realizes the replacement of lead-acid batteries through the application of super capacitors. Since the capacity decay rate of super capacitors is extremely low, the number of times of charging and discharging is as high as more than 10,000 times, thus greatly improving the overall UPS power system. life.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions such as "first", "second", "one", etc. in the present invention are only used for description purposes, and should not be interpreted as indicating or implying their relative importance or implicitly indicating the indicated technical features quantity. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, "fixed" may be a fixed connection, a detachable connection, or an integrated; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two elements or an interaction relationship between the two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims (10)

1. a centralized UPS power supply system for rail transit, is characterized in that, comprises: the supercapacitor cabinet, input switch cabinet, UPS main cabinet and centralized output monitoring cabinet electrically connected successively, wherein: The super capacitor cabinet is used to store DC power for the UPS; it includes the super capacitor and the super capacitor CMS management system, the super capacitor CMS management system is used to monitor the parameter data of the super capacitor, and generate a control signal according to the parameter data to control the UPS Charging and discharging of supercapacitors; The UPS main cabinet, including the UPS, is connected in communication with the supercapacitor CMS management system for real-time response to control signals generated by the supercapacitor CMS management system; The input switch cabinet is used to connect to the mains and input the electric energy into the UPS main cabinet. When the mains power supply is normal, the super capacitor is charged through the UPS main cabinet and the electric energy is input into the centralized output monitoring cabinet, so as to be connected with the centralized control cabinet. The output monitoring cabinet is electrically connected to supply power to each rail transit subsystem; and when the mains power supply is abnormal, the super capacitor is discharged through the UPS main cabinet to supply power to each rail transit subsystem through the electric energy output by the super capacitor. 2. A centralized UPS power supply system for rail transit according to claim 1, wherein the input switch cabinet comprises: DC busbar, UPS DC main switch, AC busbar, UPS main power input switch; One end of the DC busbar is connected to the super capacitor cabinet, and the other end is connected to the UPS main cabinet through the UPS DC main switch; the AC busbar is connected to the commercial power, and the UPS main cabinet is connected to the AC through the UPS main power input switch. busbar connection. 3. a kind of centralized UPS power supply system for rail transit according to claim 2, is characterized in that, described UPS main cabinet comprises: Several power modules, each of which includes DC/DC, AC/DC, and DC/AC power conversion units, and the power modules are used to convert the power supply through the AC/DC power conversion unit when the commercial power supply is normal. After the commercial power is converted into DC power, the super capacitor is charged through the DC/DC power conversion unit; when the power supply of the commercial power is abnormal, the DC power of the super capacitor is released. /AC power conversion unit converts DC power into AC power, which is input to the centralized output monitoring cabinet for use by each rail transit subsystem. 4. A centralized UPS power supply system for rail transit according to claim 3, wherein the input switch cabinet further comprises a UPS bypass input switch connected to the AC busbar; the UPS The main cabinet further includes a bypass switching module; the UPS bypass input switch is connected to the bypass switching module; The UPS bypass output switch is turned on when the power module fails, so as to input the commercial power into the bypass switching module and then into the centralized output monitoring cabinet to supply power to each rail transit subsystem. 5. A centralized UPS power supply system for rail transit according to claim 4, characterized in that, the UPS main cabinet is further provided with an overhaul bypass switch connected to the UPS bypass input switch for The UPS main cabinet is turned on when it needs to be repaired, so that the mains can be directly input into the centralized output monitoring cabinet. 6 . The centralized UPS power supply system for rail transit according to claim 2 , wherein the input switch cabinet further comprises a UPS external maintenance bypass switch connected to the AC busbar. 6 . It is electrically connected to the centralized output monitoring cabinet, and is used to conduct electricity when the UPS main cabinet fails, so as to directly input the commercial power into the centralized output monitoring cabinet. 7. A centralized UPS power supply system for rail transit according to claim 2, wherein the super capacitor CMS management system comprises: a monitoring unit for monitoring parameter data of the super capacitor, the parameter data including: the voltage of the capacitor cell; a signal generating unit, configured to generate a charge prohibition signal when the monitored capacitor cell voltage is greater than or equal to a preset maximum charging voltage; and when the monitored capacitor cell voltage is less than or equal to a preset minimum discharge voltage, generate a discharge prohibition signal; The UPS is also used to interrupt the UPS DC main switch through the supercapacitor CMS management system to stop charging the supercapacitor when receiving a charge prohibition signal; when receiving a discharge prohibition signal, interrupt the UPS DC through the supercapacitor CMS management system The main switch is used to stop the power input into the centralized output monitoring cabinet, so as to interrupt the power supply to each rail transit subsystem electrically connected with the centralized output monitoring cabinet. 8. A centralized UPS power supply system for rail transit according to claim 1, wherein the centralized output monitoring cabinet comprises: AC bus, several feeder loop switches connected to the AC bus, and a time-sharing power-off module connected to the feeder loop switch; The one feeder loop switch is correspondingly connected to one rail transit subsystem; each rail transit subsystem is connected to the AC bus through its corresponding feeder loop switch; The time-sharing power-off module is used to set the on-time duration of each feeder circuit switch when the mains power supply is abnormal, so as to respectively limit the duration of power supply to each rail transit subsystem by the electric energy output by the super capacitor. 9. The centralized UPS power supply system for rail transit according to claim 1, wherein the input switch cabinet further comprises: The dual power switch is used to control the mains input at the preset first power source or the preset second power source. 10 . The centralized UPS power supply system for rail transit according to claim 3 , wherein the power module is a high-frequency IGBT power module. 11 .

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