High-voltage direct-current inverter power supply applied to tunnel fire-fighting system

Abstract

The utility model relates to the technical field of power electronics, in particular to a high-voltage direct-current inverter power supply applied to a tunnel fire-fighting system, which comprises a high-voltage direct-current interface preprocessing unit, a high-voltage inverter unit, an alternating-current output processing unit, an intelligent control module, a communication module and a touch screen module, according to the utility model, advanced power electronic conversion technology is adopted, high-voltage direct current input 1500V is efficiently converted into stable 380V alternating current, and precise PWM modulation and closed-loop control technology are combined, so that the power loss is effectively reduced, the conversion efficiency is improved, and the overall energy efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, especially to a high-voltage direct-current inverter power supply applied to a tunnel fire-fighting system. BACKGROUND

[0002] With the growing demand for new energy grid connection, high-speed transportation power supply and industrial automation, high-voltage direct-current power supply technology has gradually become an important research direction in the field of power electronics. Among them, the 1500V direct-current power supply scheme is widely used in intelligent highway long-distance power supply systems, such as tunnel fire-fighting system power supply, due to its low power loss and high transmission efficiency. However, the 1500V direct-current power supply cannot directly power the fire-fighting equipment, and needs to be converted into three-phase alternating current voltage suitable for the normal operation of the fire-fighting system through power electronic conversion technology.

[0003] The prior art scheme usually adopts modular design, and constructs the overall system by parallel connection of multiple inverter units to facilitate expansion and redundancy backup. These inverter units generally adopt multi-level inverter topology to reduce switching loss and improve output power quality. Each module operates independently and has self-protection function, and through local filtering and centralized filtering of the busbar, standard 380V alternating current output is finally formed. In addition, the system uses distributed digital controllers to coordinate the switching sequence of each module to ensure synchronous operation, current sharing control, and realize remote monitoring and fault diagnosis, and improve the intelligent management ability of the system.

[0004] However, under the background of 1500V direct-current long-distance power supply, the existing inverter system still has some technical difficulties and deficiencies. First, most power devices lack sufficient high-voltage resistance, making it difficult to adapt to the application environment of 1500V high-voltage input. Second, in the process of power electronic conversion of high-voltage input, if the control strategy or switch device selection is improper, it may cause high conversion loss, reduce system efficiency, and affect the reliability and economy of the equipment. In addition, the existing high-voltage direct-current inverter power supply often lacks electrical isolation capability, increasing the safety risk in the system operation process, and cannot meet the demand of the tunnel fire-fighting system for high reliability and high safety. Therefore, for the inverter power supply of 1500V high-voltage direct-current input, how to ensure high-efficiency conversion while improving the safety, reliability and intelligent level of the system has become a technical problem to be solved. SUMMARY

[0005] Based on the above problems, the utility model provides a kind of high-voltage direct-current inverter power supply applied to tunnel fire-fighting system, using advanced efficient inverter technology and precision control strategy, realize 1500V direct current to 380V alternating current Efficient conversion, maximum degree reduces conversion loss, simultaneously by integrating multiple functional modules and optimizing circuit design reduces the stress of each power switch device, improve the durability and reliability of equipment, meet the requirements of long-term stable work of power supply under the special environment of tunnel.

[0006] The utility model realizes by following technical scheme:

[0007] A kind of high-voltage direct-current inverter power supply applied to tunnel fire-fighting system, including high-voltage direct-current interface preprocessing unit, high-voltage inverter unit, alternating current output processing unit, intelligent control module, communication module and touch screen module;

[0008] The positive input port IN+ and negative input port IN- of the high-voltage direct-current interface preprocessing unit are connected to the positive and negative of external high-voltage direct-current power supply respectively;The positive output port OUT+ of the high-voltage direct-current interface preprocessing unit is connected to the positive input port DCin+ of high-voltage inverter unit, and negative output port OUT- is connected to the negative input port DCin- of high-voltage inverter unit;

[0009] The output port L1, L2, L3 of the high-voltage inverter unit is connected to the input port L1, L2, L3 of alternating current output processing unit respectively;

[0010] The intelligent control module is connected with high-voltage inverter unit by CANH, CANL port, and is connected with communication module by RS485-A / RS485-B port;

[0011] The communication module is connected with touch screen module by RS485-A / RS485-B port;

[0012] The switch quantity feedback port of the high-voltage direct-current interface preprocessing unit is connected to the state signal receiving port of intelligent control module;

[0013] The voltage signal, current signal detection port of the high-voltage inverter unit is connected to the data detection port of intelligent control module.

[0014] Further, the high-voltage DC interface preprocessing unit comprises a high-voltage molded case circuit breaker, a surge protector, a filter circuit and a fuse; the input end of the high-voltage molded case circuit breaker is connected to the positive and negative poles of an external high-voltage DC power supply, and the output end is connected to the input end of the filter circuit; the output end of the filter circuit is connected to the input end of the surge protector, the output end of the surge protector is connected to the input end of the fuse, and the output end of the fuse is connected to the positive output port OUT+ and the negative output port OUT- of the high-voltage DC interface preprocessing unit.

[0015] Further, the high-voltage inverter unit adopts a bridge inverter topology structure and comprises a plurality of IGBT power switch tubes and a PWM modulation circuit; the input end of the IGBT power switch tube is connected to the positive output port OUT+ and the negative output port OUT- of the high-voltage DC interface preprocessing unit, and the output end is connected to the input end of the PWM modulation circuit; the output end of the PWM modulation circuit is connected to the input ports L1, L2 and L3 of the AC output processing unit.

[0016] Further, the AC output processing unit comprises a delta-star connection isolation transformer and a power distribution unit; the input end of the isolation transformer is connected to the output ports L1, L2 and L3 of the high-voltage inverter unit, and the output end is connected to the input end of the power distribution unit; the output end of the power distribution unit is connected to the loads at various levels of the tunnel fire protection system.

[0017] Further, the intelligent control module adopts a TMS320F28069 chip, is connected to the high-voltage inverter unit through the CANH and CANL ports, and is used for realizing PWM modulation, closed-loop control and synchronous control; the intelligent control module is connected to the communication module through the RS485-A / RS485-B ports and is used for realizing remote monitoring and fault early warning.

[0018] Further, the communication module is connected to the intelligent control module through the RS485-A / RS485-B ports and exchanges information with an external monitoring control system platform through a 4G / 5G communication network.

[0019] Further, the touch screen module is connected to the communication module through the RS485-A / RS485-B ports and is used for realizing a man-machine interaction function, supporting real-time data viewing, alarm processing and parameter setting.

[0020] Further, the positive output port OUT+ and the negative output port OUT- of the high-voltage DC interface preprocessing unit are also connected to the positive input port and the negative input port of the DC / DC step-down unit.

[0021] The positive output port DCout+ of the DC / DC step-down unit is connected to the positive power supply ports of the intelligent control module, the communication module, the touch screen module and the cooling fan respectively, and the negative output port DCout- is connected to the negative power supply ports of the intelligent control module, the communication module, the touch screen module and the cooling fan respectively.

[0022] Further, the switch quantity feedback port of the high-voltage DC interface preprocessing unit is connected to the state signal receiving port of the intelligent control module through a wire, for collecting voltage, current and temperature data in real time, uploading the data through a local display and a communication interface, and realizing remote monitoring and fault early warning.

[0023] Further, the voltage signal and current signal detection ports of the high-voltage inverter unit are connected to the data detection ports of the intelligent control module, for monitoring voltage and current signals in real time, and realizing overvoltage, undervoltage, overcurrent, short circuit and overtemperature protection through the intelligent control module.

[0024] The utility model has the advantages of:

[0025] (1) The high-voltage DC inverter power supply applied to a tunnel fire extinguishing system adopts advanced power electronic conversion technology, efficiently converts high-voltage DC input (1500V) into stable 380V AC, effectively reduces power loss, improves conversion efficiency, and greatly improves overall energy efficiency through accurate PWM modulation and closed-loop control technology;

[0026] (2) The high-voltage DC inverter power supply applied to a tunnel fire extinguishing system outputs low-harmonic sine wave AC through optimized input / output filtering and smooth modulation technology, ensures excellent voltage and current waveform quality, meets the strict requirements of the tunnel fire extinguishing system on high-quality power supply, and improves the stability and reliability of system operation;

[0027] (3) The high-voltage DC inverter power supply applied to a tunnel fire extinguishing system integrates multiple protection functions such as overvoltage, undervoltage, overcurrent, short circuit, overtemperature, surge and island protection in the inverter power supply cabinet, can quickly detect abnormal conditions and automatically cut off the fault area, avoids damage to internal devices and load equipment, improves the fault tolerance and overall safety of the system;

[0028] (4) The high-voltage DC inverter power supply applied to a tunnel fire extinguishing system is equipped with a high-speed digital controller and RS485, Ethernet and other communication interfaces, realizes real-time monitoring of key parameters such as voltage, current and temperature, has fault early warning and remote monitoring functions, can quickly feedback fault information, supports remote diagnosis and maintenance, reduces operation and maintenance costs, and improves response speed;

[0029] (5) The high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system can provide continuous and stable power supply for the key equipment of the tunnel fire-fighting system, ensure the reliable operation of the fire-fighting equipment in an emergency, guarantee the safety of personnel and property, and meet the high-standard power supply requirements of the modern tunnel fire-fighting system.

[0030] (6) The high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system can provide continuous and stable power supply for the key equipment of the tunnel fire-fighting system, ensure the reliable operation of the fire-fighting equipment in an emergency, guarantee the safety of personnel and property, and meet the high-standard power supply requirements of the modern tunnel fire-fighting system. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 The topological structure diagram of the high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system is provided for the present application.

[0033] Figure 2 The high-voltage direct-current interface preprocessing unit circuit principle schematic diagram of the high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system is provided for the present application.

[0034] Figure 3 The high-voltage direct-current interface preprocessing unit circuit principle schematic diagram of the high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system is provided for the present application.

[0035] Figure 4 The high-voltage direct-current interface preprocessing unit circuit principle schematic diagram of the high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system is provided for the present application.

[0036] Figure 5 The high-voltage direct-current interface preprocessing unit circuit principle schematic diagram of the high-voltage direct-current inverter power supply applied to the tunnel fire-fighting system is provided for the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the present application in combination with embodiments and drawings. The illustrative embodiments and their descriptions are only used to explain the present application, and not as a limitation of the present application.

[0038] Embodiment 1

[0039] The embodiment provides a high-voltage direct-current inverter power supply applied to a tunnel fire extinguishing system.

[0040] Reference Figure 1 The high-voltage direct-current inverter power supply applied to the tunnel fire extinguishing system comprises a high-voltage direct-current interface preprocessing unit, a high-voltage inverter unit, an alternating-current output processing unit, an intelligent control module, a communication module and a touch screen module.

[0041] Reference Figure 2 In the embodiment, the high-voltage direct-current interface preprocessing unit is configured to integrate a molded case circuit breaker, a surge protector, a fuse and other switch control elements and safety protection devices in accordance with high-voltage high-power use conditions, to prevent burst interference or instantaneous overvoltage and overcurrent damage, to filter high-voltage direct-current input of the entire inverter power supply, to configure safety capacitors and transformers and other filtering components at the high-voltage direct-current input end, to significantly reduce voltage ripple and high-frequency noise of a direct-current bus, to improve system power quality, to improve electromagnetic compatibility of the entire system, to reduce interference on downstream sensitive devices such as controllers and communication modules, to effectively suppress interference signals generated in the process of 1500V direct-current input and switching conversion, and to ensure purity of the high-voltage input power supply.

[0042] Reference Figure 3 In the embodiment, the high-voltage inverter unit adopts a bridge inverter topology, converts 1500V direct current input through the high-voltage direct-current interface preprocessing unit into 380V alternating current, and is composed of multiple IGBT power switch tubes, PWM modulation circuits and the like, realizes sinusoidal wave output through accurate digital control, reduces harmonics and improves conversion efficiency, as shown in FIG. 1. Figure 3 As shown in FIG. 1, 1500V direct current is filtered through a capacitor, voltage conversion is realized by controlling each IGBT to turn on and turn off through a PWM modulation signal, and the IGBT is periodically turned on and turned off between a direct-current power supply and a load according to the PWM signal. After repeated switching, a three-phase output sinusoidal wave composed of high-frequency pulses can be formed in each modulation period, so that conversion from 1500V direct current to 380V alternating current is realized.

[0043] Reference Figure 4In the embodiment, the AC output processing unit integrates a delta-star isolation transformer to provide stable neutral grounding, provide natural neutral point, balance the voltage of each phase, and help introduce common-mode interference in the system into the ground; effectively reduce the starting current, reduce the transient impact, and reduce the mechanical and electrical stress; after conversion by the delta-star isolation transformer, a smoother and more sinusoidal AC power can be generated, reducing harmonic distortion; in addition, an input power distribution unit is integrated, and AC power is distributed to each level of load in the tunnel fire extinguishing system according to a predetermined scheme, realizing multi-output, ensuring stable and balanced power supply to each load, and realizing independent control and protection of the output circuit.

[0044] Reference Figure 5 In the embodiment, the intelligent control module realizes PWM modulation, closed-loop control and synchronous control based on the TMS320F28069 chip high-speed DSP, ensuring the stability and accuracy of the output voltage, frequency and phase; integrating overvoltage, undervoltage, overcurrent, short circuit and overtemperature monitoring on the DC side and the AC side, ensuring rapid isolation of faults in any abnormal state and preventing the spread of accidents. The state monitoring built-in sensor collects voltage, current, temperature and other data in real time, uploads the data through local display and communication interface, and realizes remote monitoring and fault warning.

[0045] The communication module supports multiple communication protocols such as Modbus, TCP / IP, RS485 and Ethernet, facilitates information exchange with external monitoring and control systems, and is suitable for remote monitoring and data acquisition. The integrated intelligent gateway module supports multiple communication protocols for communication with the cloud and uploads information. It is suitable for remote monitoring data.

[0046] The touch screen module realizes intuitive monitoring, control and management of the fire-fighting inverter power supply; has human-machine interaction (HMI) function, supports real-time data viewing, alarm processing and parameter setting.

[0047] It should be clear that the innovation of the scheme is focused on the power conversion and control technology of the high-voltage DC inverter power supply, rather than the specific implementation of the communication or display device, so in the embodiment only the supported protocols of the communication module and the functions of the touch screen module are described to meet the requirements, while maintaining the applicability and universality of the embodiment, avoiding limited implementation scope.

[0048] Embodiment 2

[0049] The embodiment proposes a connection relationship of a high-voltage DC inverter power supply applied to a tunnel fire extinguishing system based on embodiment 1.

[0050] Reference Figures 1-5In this embodiment, the high-voltage DC inverter power supply converts 1200V-1600V high-voltage DC into 380V AC power efficiently, and provides stable and reliable power supply for tunnel fire-fighting equipment.

[0051] This embodiment includes a high-voltage DC interface preprocessing unit, a high-voltage inverter unit, an AC output processing unit, a DC / DC step-down unit, an intelligent control module, a communication module, and a touch screen module. Each unit is connected by reasonable electrical connection and signal interaction to realize power conversion, protection control, and remote monitoring functions.

[0052] First, the high-voltage DC input receives 1200V-1600V high-voltage DC, of which the positive pole is connected to the positive input port IN+ of the high-voltage DC interface preprocessing unit through a wire, and the negative pole is connected to the negative input port IN- of the high-voltage DC interface preprocessing unit through a wire. The high-voltage DC interface preprocessing unit filters, protects, and performs electromagnetic compatibility processing on the input high-voltage DC to ensure power quality, improve system anti-interference ability, and reduce the impact and interference of high-voltage DC input on the subsequent circuit. This unit integrates safety protection components such as molded case circuit breakers, surge protectors, and fuses, which can effectively prevent sudden interference, transient overvoltage, and overcurrent damage to the subsequent modules, while providing switching value feedback signals to monitor the high-voltage DC input state.

[0053] The preprocessed high-voltage DC is output from the high-voltage DC interface preprocessing unit, of which the positive output port OUT+ is connected to the positive input port DCin+ of the high-voltage inverter unit, and also connected to the positive input port of the DC / DC step-down unit; the negative output port OUT- is connected to the DCin- of the high-voltage inverter unit and the negative input port of the DC / DC step-down unit.

[0054] The high-voltage inverter unit adopts a bridge inverter topology structure, and realizes efficient inversion through IGBT power switching tubes and PWM modulation circuits to convert the input high-voltage DC into stable three-phase AC power. In this process, the inverter unit accurately controls the conduction and shutdown of IGBT through PWM modulation signals, so that the high-frequency pulse signal forms a standard 380V AC output after filtering. The three-phase AC output ports of the high-voltage inverter unit are L1, L2, and L3, of which the L1 output port is connected to the L1 input port of the AC output unit, the L2 output port is connected to the L2 input port of the AC output unit, and the L3 output port is connected to the L3 input port of the AC output unit.

[0055] The AC output unit is internally integrated with a triangle rotating star type isolation transformer, which provides stable neutral grounding, optimizes phase voltage balance, effectively reduces common mode interference, and improves power supply quality. The unit can also reduce starting current, reduce transient impact, and reduce mechanical and electrical stress on the system. In addition, the unit is internally provided with a power distribution module, which can distribute AC power to each level of load of the tunnel fire fighting system according to a predetermined scheme, ensure that each load device obtains stable and balanced power supply, and realize independent control and protection of each output loop.

[0056] The DC / DC step-down unit is mainly used to provide low-voltage DC power for control and monitoring devices. The positive output port DCout+ is respectively connected to the positive power supply ports of the intelligent control module, the communication module, the touch screen module and the cooling fan; the negative output port DCout- is respectively connected to the negative power supply ports of the intelligent control module, the communication module, the touch screen module and the cooling fan.

[0057] The intelligent control module realizes PWM modulation, closed-loop control and synchronous control based on a high-speed DSP chip TMS320F28069, ensuring the stability of output voltage, frequency and phase. The unit monitors the system running state in real time, collects key parameters such as voltage, current and temperature, and has overvoltage, undervoltage, overcurrent, short circuit and overtemperature protection functions, ensuring that the system can quickly isolate faults and prevent accidents from spreading in abnormal conditions. At the same time, the unit provides multiple data interfaces, among which the switch quantity feedback port of the high-voltage DC interface preprocessing unit is connected to the state signal receiving port of the intelligent control module through a wire, the CAN.H and CAN.L ports of the high-voltage inverter unit are respectively connected to the CANH and CANL ports of the intelligent control module, and the voltage signal and current signal detection ports of the high-voltage inverter unit are connected to the data detection ports of the intelligent control module, realizing accurate control and monitoring of the high-voltage inverter unit.

[0058] The communication module supports multiple industrial communication protocols such as Modbus, TCP / IP, RS485 and Ethernet, ensuring that the inverter power supply can interact with external monitoring and control systems. The RS485-A / RS485-B ports of the intelligent control module are respectively connected to the RS485-A / RS485-B ports of the communication module, and at the same time the RS485-A / RS485-B ports of the communication unit are also connected to the RS485-A / RS485-B ports of the touch display screen. In addition, the communication module integrates an intelligent gateway, supports 4G / 5G communication network, can realize real-time interconnection with the cloud monitoring platform, realizes remote data transmission, running state monitoring and fault early warning, and improves the remote operation and maintenance ability of the system.

[0059] The touch display screen module provides human-machine interaction (HMI) functions, supports real-time data viewing, alarm processing and parameter setting. Users can intuitively monitor the running state of the inverter power supply through the touch screen and perform necessary control and management, thereby improving the operability and intelligent level of the system.

[0060] In summary, the high-voltage DC inverter power supply provided in the embodiment can efficiently and stably convert 1200V-1600V high-voltage DC power into 380V AC power, providing safe and reliable power supply for the tunnel fire fighting system. The system not only has efficient inverter conversion capability, but also integrates multiple protection mechanisms to ensure stable operation of the equipment under various working conditions. In addition, the intelligent monitoring and remote operation and maintenance functions greatly improve the maintainability of the system, which helps to reduce operation and maintenance costs and improve emergency response efficiency, thereby meeting the stringent requirements of the tunnel fire fighting system for efficient, safe and stable power supply.

[0061] In the embodiment, a specific implementation example of a high-voltage DC inverter power supply applied to a tunnel fire fighting system is provided, including the following steps:

[0062] (1) The high-voltage DC inverter power supply is connected to the tunnel fire fighting power supply and distribution system. In the fire fighting power supply and distribution system of the high-speed road tunnel, the high-voltage DC inverter power supply cabinet is planned and installed. According to the system layout requirements, the inverter power supply cabinet is installed at an appropriate position and is reasonably connected with the fire fighting control system and the monitoring system. The appearance and the wiring terminals of the equipment are checked to ensure that there is no damage and that all wiring terminals and fasteners are firmly connected. According to the on-site electrical wiring diagram, it is checked whether the connections of the input, output and communication interfaces are correct to ensure that they meet the system connection standards and that the equipment grounding terminal is reliably grounded to improve the safety of the system.

[0063] (2) High-voltage DC input connection and start-up preparation. According to the on-site power supply and distribution scheme, it is confirmed whether the input power voltage is within the rated range of 1200V-1600V. The high-voltage DC input cable is connected, with the positive pole connected to the IN+ port of the high-voltage DC interface preprocessing unit and the negative pole connected to the IN- port. Insulating tools are used to tighten the cable terminals to avoid loose or loose connections. It is checked whether the cable insulation layer is intact to avoid the risk of short circuit. Before power-on, the input voltage is measured using a multimeter or a high-voltage tester to confirm that the voltage value is within the rated range. It is ensured that the input molded case circuit breaker is in the open state to prevent misoperation. The input molded case circuit breaker is rotated to the closed state to make the high-voltage DC power supply formally connected to the system. It is observed whether the input voltage indicator light on the panel is lit to confirm that the system has been correctly connected to the DC power supply.

[0064] (3) Equipment fault self-checking and pre-start safety detection, automatic fault self-checking: the inverter power supply enters the automatic self-checking mode, detects whether there is an abnormal condition in the system, and the system will detect the following parameters: whether the input voltage is within the rated range (1200V~1600V), whether the output voltage is abnormal, overcurrent, short circuit detection, IGBT state check, heat dissipation system working state detection, if overvoltage, undervoltage, overcurrent, short circuit, overtemperature, IGBT damage and other faults are found during the detection process, the equipment will automatically cut off the main circuit contactor, the fault indicator light will light up, and the fault information will be stored. The equipment is designed in a fault self-recovery mode without manual intervention. When the EPS system detects a fault, it automatically executes a reset and restart program. If five faults occur within 10 minutes, the system will enter a locked state and will no longer automatically restart to avoid the device running in an abnormal state.

[0065] If the system is in a locked state, manual intervention is required, and the following steps are performed: check the fault through the display screen or upper computer; after the fault is handled, press the fault reset button on the power cabinet panel, rotate the cabinet start / stop knob to the start position, and restart the inverter power supply.

[0066] (4) System starts and outputs AC power, checks the AC output end to ensure that the wiring of the AC output end is correct, L1, L2, and L3 output ports are connected to the corresponding ports of the AC output unit respectively, ensures that the load device is connected correctly, and the total power does not exceed the rated capacity of the inverter power supply. Start the inverter output, rotate the cabinet start / stop knob to the start position, the device starts to work, the high-voltage DC power is converted into stable 380V AC power, the touch display screen displays the output voltage, current, frequency and other parameters in real time, observes whether the output voltage is stable within the range of 380V±5%, ensures that the output meets the requirements, the display screen displays the device running state in real time, such as voltage, current, temperature and other parameters, records the device running log, stores historical fault information, and facilitates subsequent maintenance.

[0067] (5) Remote monitoring and intelligent management, data uploading, the device supports RS485, Modbus, TCP / IP and other protocols through the communication unit to upload running data to the cloud monitoring platform, the touch screen provides local data storage and real-time query function, the operation and maintenance personnel can remotely access the monitoring system through the PC end or mobile end to check the device running state. When an abnormality occurs, the system can send alarm information to the management personnel to realize remote early warning. The remote control function supports device parameter adjustment, fault diagnosis and system restart, improves maintenance efficiency, and reduces labor cost.

[0068] The application of the high-voltage direct-current inverter power supply in the tunnel fire-fighting system adopts strict operation steps to ensure the safety, stability and reliability of the equipment. From the access to the system, the input power inspection, the fault self-checking, the inverter output to the remote monitoring, each link considers the requirements of the stable operation and intelligent management of the equipment. The system can not only efficiently convert the high-voltage direct-current power, but also can realize the remote management through the intelligent monitoring system, greatly improves the power supply reliability and the maintenance convenience of the tunnel fire-fighting system.

[0069] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high-voltage DC inverter power supply for use in tunnel fire protection systems, characterized in that, It includes a high-voltage DC interface preprocessing unit, a high-voltage inverter unit, an AC output processing unit, an intelligent control module, a communication module, and a touch screen module; The positive input port IN+ and negative input port IN- of the high-voltage DC interface preprocessing unit are respectively connected to the positive and negative terminals of the external high-voltage DC power supply; the positive output port OUT+ of the high-voltage DC interface preprocessing unit is connected to the positive input port DCin+ of the high-voltage inverter unit, and the negative output port OUT- is connected to the negative input port DCin- of the high-voltage inverter unit. The output ports L1, L2, and L3 of the high-voltage inverter unit are respectively connected to the input ports L1, L2, and L3 of the AC output processing unit. The intelligent control module is connected to the high-voltage inverter unit through CANH and CANL ports, and to the communication module through RS485-A / RS485-B ports. The communication module is connected to the touch screen module via an RS485-A / RS485-B port; The switch feedback port of the high voltage DC interface preprocessing unit is connected to the status signal receiving port of the intelligent control module. The voltage and current signal detection ports of the high-voltage inverter unit are connected to the data detection port of the intelligent control module.

2. The high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The high-voltage DC interface preprocessing unit includes a high-voltage molded case circuit breaker, a surge protector, a filter circuit, and a fuse. The input terminal of the high-voltage molded case circuit breaker is connected to the positive and negative terminals of an external high-voltage DC power supply, and the output terminal is connected to the input terminal of the filter circuit. The output terminal of the filter circuit is connected to the input terminal of the surge protector, the output terminal of the surge protector is connected to the input terminal of the fuse, and the output terminal of the fuse is connected to the positive output port OUT+ and the negative output port OUT- of the high-voltage DC interface preprocessing unit.

3. The high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The high-voltage inverter unit adopts a bridge inverter topology and includes multiple IGBT power switches and a PWM modulation circuit. The input terminals of the IGBT power switches are connected to the positive output port OUT+ and the negative output port OUT- of the high-voltage DC interface preprocessing unit, and the output terminals are connected to the input terminals of the PWM modulation circuit. The output terminals of the PWM modulation circuit are connected to the input ports L1, L2, and L3 of the AC output processing unit.

4. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The AC output processing unit includes a delta-to-star connected isolation transformer and a power distribution unit; the input terminal of the isolation transformer is connected to the output ports L1, L2, and L3 of the high-voltage inverter unit, and the output terminal is connected to the input terminal of the power distribution unit; the output terminal of the power distribution unit is connected to the various loads of the tunnel fire protection system.

5. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The intelligent control module uses a TMS320F28069 chip and is connected to the high-voltage inverter unit through CANH and CANL ports to realize PWM modulation, closed-loop control and synchronous control; the intelligent control module is connected to the communication module through RS485-A / RS485-B ports to realize remote monitoring and fault early warning.

6. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The communication module is connected to the intelligent control module via RS485-A / RS485-B ports and interacts with the external monitoring and control system platform via a 4G / 5G communication network.

7. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The touchscreen module is connected to the communication module via an RS485-A / RS485-B port to enable human-computer interaction, supporting real-time data viewing, alarm handling, and parameter setting.

8. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The positive output port OUT+ and negative output port OUT- of the high voltage DC interface preprocessing unit are also connected to the positive input port and negative input port of the DC / DC step-down unit. The positive output port DCout+ of the DC / DC step-down unit is connected to the positive power supply ports of the intelligent control module, communication module, touch screen module, and cooling fan, respectively, and the negative output port DCout- is connected to the negative power supply ports of the intelligent control module, communication module, touch screen module, and cooling fan, respectively.

9. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The switch feedback port of the high-voltage DC interface preprocessing unit is connected to the status signal receiving port of the intelligent control module via a wire. It is used to collect voltage, current and temperature data in real time, and upload the data through local display and communication interface to realize remote monitoring and fault early warning.

10. A high-voltage DC inverter power supply for use in a tunnel fire protection system according to claim 1, characterized in that, The voltage and current signal detection ports of the high-voltage inverter unit are connected to the data detection port of the intelligent control module for real-time monitoring of voltage and current signals, and the intelligent control module provides overvoltage, undervoltage, overcurrent, short circuit and overtemperature protection.

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