High-efficiency energy-saving direct current screen

Abstract

The utility model discloses a high-efficiency energy-saving direct-current screen, which is characterized in that two paths of alternating-current (AC) 380V three-phase five-wire alternating-current power supplies are electrically connected with the input end of an alternating-current double-path power supply switching unit (ATS) respectively through input circuit breakers QF1 and QF2, and the output end of the alternating-current double-path power supply switching unit (ATS) is connected with rectification modules M1, M2, M3 and M4 of a rectification unit; the output ends of the rectification modules M3 and M4 are connected in parallel and then are electrically connected with the storage battery unit and closing buses + HM and-HM through a storage battery BMS module M7 respectively, and power is supplied to a load through output circuit breakers QF-H1... QF-Hn; the output ends of the rectifier modules M1 and M2 are connected in parallel and then electrically connected with the control buses + KM and-KM, the closing buses + HM and-HM are also electrically connected with the control buses + KM and-KM through a direct current voltage stabilization module DMP of the direct current voltage stabilization unit, and power is supplied to a load through output breakers QF-K1... Kn. And the voltage fluctuation is less than 0.2%, and no impact is caused to the load.

Description

Technical Field

[0001] The present invention relates to a direct current power supply operating system, and in particular to a high-efficiency and energy-saving direct current panel. Background Art

[0002] With the rapid development of power electronics technology, as a product of the development of power electronics technology in the 21st century, DC panels have been widely used in the field of power operation power supply in power plants and substations. DC panel is the abbreviation of DC power supply operating system, and its general name is intelligent maintenance-free DC power panel. It provides power for control load, power load, lighting load, etc., and is the basis for control and protection of contemporary power systems. The general model is GZDW. The power operation power supply in power plants and substations now uses DC power supply, which provides power for control load, power load and DC accident lighting load, etc., and is the basis for control and protection of contemporary power systems. DC panel is a new type of DC system for digital control, protection, management and measurement. The monitoring host part is highly integrated and adopts a modular structure. It contains insulation monitoring, battery inspection, grounding alarm, battery activation, silicon chain voltage stabilization, microcomputer central signal and other functions. The host is equipped with a large LCD touch screen, and various operating states and parameters are displayed in Chinese characters. The overall design is convenient and simple, and the human-machine interface is friendly, which conforms to user habits. The DC panel system provides powerful functions for remote detection and control, and has remote control, remote adjustment, telemetry, telesignaling and remote communication interface. Through the remote communication interface, the operating parameters of the DC power supply system can be obtained remotely, and the operating status and set values ​​can also be set and modified through the interface to meet the requirements of power automation and unmanned substations in power systems: equipped with standard RS232 / 485 serial interface and Ethernet interface, it can be easily incorporated into the power station automation system. Since the control bus is stepped down by the battery through the silicon chain, the number of accesses to the silicon chain is adjusted to be different, and the control bus voltage is stable, but the minimum resolution of the silicon chain is different, so the voltage stabilization accuracy of the control bus is also different, and the silicon chain can only step down, not step up. When the battery group voltage is low, the control bus voltage cannot be stabilized; the voltage cannot be adjusted as needed, and the power supply voltage fluctuation damages the load. The battery is easily affected by factors such as ambient temperature and humidity. The discharge voltage of the battery will change after long-term use, affecting the service life. Utility Model Content

[0003] In order to improve at least one defect of the prior art, the present invention provides a high-efficiency and energy-saving DC screen, which controls the bus output voltage to be constant and can adjust the voltage as needed. The voltage fluctuation is less than 0.2%, and there is no impact on the load, thus solving the problem of damage to the load due to power supply voltage fluctuation.

[0004] The technical solution adopted by the present invention is a high-efficiency energy-saving DC panel, in which an AC dual-circuit power supply switching unit ATS, a rectifier unit, a DC voltage stabilizing unit, a battery unit, and a DC monitoring unit are integrated; two AC 380V three-phase five-wire AC power supplies are electrically connected to the input end of the AC dual-circuit power supply switching unit ATS through input circuit breakers QF1 and QF2 respectively, and the output end of the AC dual-circuit power supply switching unit ATS is connected to the rectifier modules M1, M2 and M3, M4 of the rectifier unit; the output ends of the rectifier modules M3 and M4 are connected in parallel and are connected to the battery unit and the closing busbars +HM, -H through the battery BMS module M7 respectively. M is electrically connected, and power is supplied to the load through the output circuit breaker QF-H1...QF-Hn; the output ends of the rectifier modules M1 and M2 are connected in parallel and electrically connected to the control bus +KM, -KM, and at the same time, the closing bus +HM, -HM is also electrically connected to the control bus +KM, -KM through the DC voltage stabilizing module DMP of the DC voltage stabilizing unit, and power is supplied to the load through the output circuit breaker QF-K1...Kn. When the AC power supply is normal, the control unit controls the M1 and M2 rectifier units to provide power for the control bus +KM, -KM. The DC monitoring unit is connected to the rectifier unit and the DC voltage stabilizing unit through the RS485 communication bus, and is displayed and controlled through the human-computer interaction interface.

[0005] Preferably, the DC panel also integrates an AC data acquisition module, a DC data acquisition module, a battery acquisition module, a switch quantity detection module, an insulation detection module, and an integrated automatic control system; the DC monitoring unit is connected to the AC data acquisition module, the DC data acquisition module, the battery acquisition module, the switch quantity detection module, and the integrated automatic control system via an RS485 communication bus.

[0006] Preferably, the rear end of the AC dual-circuit power switching unit ATS is equipped with an overvoltage protector TVS.

[0007] Preferably, there is current sharing control between the rectifier module M1 and the rectifier module M2, and there is current sharing control between the rectifier module M3 and the rectifier module M4.

[0008] Compared with the prior art, the beneficial effects disclosed in the present invention are as follows: the control bus output voltage of an efficient and energy-saving DC screen of the present invention is constant, and the voltage can be adjusted as needed, the voltage fluctuation is less than 0.2%, there is no impact on the load, the damage to the load due to power supply voltage fluctuation is solved, and the efficiency is improved by more than 10% under normal AC power supply conditions; the rectifier unit adopts a high-frequency switch rectifier module, and N+1 hot backup can be used to realize hot plugging under power supply; the DC voltage stabilizing unit adopts a high-frequency switch module to stabilize the control bus voltage, and N+1 hot backup can be used to realize hot plugging under power supply, which greatly reduces the average maintenance time; the battery BMS module completes the overvoltage, undervoltage, overload, short circuit and other protections during charging and discharging of the battery pack; the monitoring unit is connected to each detection module to realize real-time detection and protection of the DC screen system parameters, and remote monitoring can be realized through the RS485 interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the principle diagram of the high-efficiency energy-saving DC screen

[0010] Figure 2 This is the monitoring unit system diagram of the DC panel disclosed in this disclosure DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings here can be arranged and designed in various different configurations.

[0012] In view of the problem of damage to the load caused by power supply voltage fluctuation in the existing DC panel, the present invention provides a high-efficiency and energy-saving DC panel. Figure 1 and Figure 2As shown, it includes an AC dual-circuit power switching unit ATS, a rectifier unit, a DC voltage stabilizing unit, a battery unit, and a DC monitoring unit; two AC 380V three-phase five-wire AC power supplies are electrically connected to the input end of the AC dual-circuit power switching unit ATS through input circuit breakers QF1 and QF2 respectively, and the output end of the AC dual-circuit power switching unit ATS is connected to the rectifier modules M1, M2 and M3, M4 of the rectifier unit; the output ends of the rectifier modules M3 and M4 are connected in parallel and are electrically connected to the battery unit and the closing busbars +HM and -HM respectively through the battery BMS module M7, and the output circuit breaker QF-H1...QF-Hn supplies power to the load; the output ends of the rectifier modules M1 and M2 are connected in parallel and electrically connected to the control bus +KM, -KM, and at the same time, the closing bus +HM, -HM is also electrically connected to the control bus +KM, -KM through the DC voltage stabilizing module DMP of the DC voltage stabilizing unit, and the load is supplied with power through the output circuit breaker QF-K1...Kn. When the AC power supply is normal, the control unit controls the M1 and M2 rectifier units to provide power to the control bus +KM, -KM. The DC monitoring unit is connected to the rectifier unit and the DC voltage stabilizing unit through the RS485 communication bus, and is displayed and controlled through the human-computer interaction interface. The DC panel also includes an AC data acquisition module, a DC data acquisition module, a battery acquisition module, a switch quantity detection module, an insulation detection module, and an integrated automatic control system; the DC monitoring unit is connected to the AC data acquisition module, the DC data acquisition module, the battery acquisition module, the switch quantity detection module, and the integrated automatic control system through an RS485 communication bus, and the rear end of the AC dual-channel power switching unit ATS is equipped with an overvoltage protector TVS, and there is a current balancing control between the rectifier module M1 and the rectifier module M2, and there is a current balancing control between the rectifier module M3 and the rectifier module M4. The current balancing control is that when multiple modules are applied in parallel, the current output of each module is the same.

[0013] When in use, two AC380V AC power supplies are input through the AC dual-power supply switching unit ATS, and one AC380V AC power supply is output and connected to the input end of the rectifier modules M3 and M4 of the rectifier unit. The rectifier unit converts the AC power supply into a DC power supply, and then outputs it from the output end as a closing bus. At the same time, one circuit passes through the battery BSM module to charge the battery pack, and the other circuit passes through the DC voltage stabilizing unit DWP and is connected to the output end of the rectifier modules M1 and M2 of the rectifier unit to control the output of the bus output. The rectifier unit adopts a high-frequency switch rectifier module with N+1 redundancy. When the AC power supply is normal, the rectifier modules M1 and M 2. The rectifier unit provides power output for the control bus KM+, KM-; the battery unit uses a high-energy battery, and its discharge end is connected to the battery BSM module; the monitoring unit has multiple internal communication ports, which are respectively connected to the rectifier unit, DC voltage stabilization unit, battery BSM module, various detection modules, human-machine interface, etc., and can detect the voltage, current and other analog quantities of the rectifier unit, DC voltage stabilization unit and battery detection unit, the state of the switch module, and can also control the DC voltage stabilization unit to adjust its output voltage to 220V. The connection between the monitoring unit and the communication unit can make this device The equipment can realize the four remote functions of "telemetry, remote control, remote communication, and remote adjustment". At the same time, the monitoring unit is also equipped with a standard RS232 / 485 serial interface and an Ethernet interface, which can communicate with other devices; the human-machine interface is equipped with a liquid crystal display screen, and various operating states and parameters are displayed in Chinese characters and graphics; when the device has AC current input, it can be converted into 220V DC output. If there is no AC current input, the battery pack unit will discharge, and the DC voltage stabilization unit DWP will control the output voltage to stabilize the output according to the output voltage of the battery unit, and the output voltage is a constant DC 220V. When both AC power sources are lost, the battery pack provides backup power to the DC panel to ensure the normal operation of the connected load. The DC voltage stabilization module DWP is connected to the battery pack through the battery BMS module M7 at the input end, and the output end is connected to the control bus, and is equipped with an RS485 communication interface. The battery BMS module M7 has battery overvoltage, overcurrent, undervoltage and other protection functions, and is equipped with an RS485 communication interface.

[0014] The present invention discloses a high-efficiency and energy-saving DC panel with a control busbar whose output voltage is constant and can be adjusted according to needs. The voltage fluctuation is less than 0.2% and there is no impact on the load, thus solving the problem of damage to the load due to power supply voltage fluctuation. Under normal AC power supply conditions, the efficiency is improved by more than 10%. The DC monitoring unit is connected with the AC data acquisition module, the DC data acquisition module, the battery inspection module, the switch quantity module, the rectifier unit and the DC voltage stabilizing unit through an RS485 communication bus for data transmission. At the same time, it is displayed and controlled through a human-computer interaction interface and can be connected with an integrated automatic control system through the RS485 communication bus to realize centralized management.

[0015] The above shows and describes the basic principles and main features of the present disclosure and the advantages of the present disclosure. Those skilled in the art should understand that the present disclosure is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure may have various changes and improvements, which fall within the scope of the present disclosure to be protected. The scope of protection claimed by the present disclosure is defined by the attached claims and their equivalents.

Claims

1. A high-efficiency and energy-saving DC panel, characterized by: The DC panel integrates an AC dual-circuit power switching unit ATS, a rectifier unit, a DC voltage stabilizing unit, a battery unit, and a DC monitoring unit; two AC 380V three-phase five-wire AC power supplies are electrically connected to the input end of the AC dual-circuit power switching unit ATS through input circuit breakers QF1 and QF2 respectively, and the output end of the AC dual-circuit power switching unit ATS is connected to the rectifier modules M1, M2 and M3, M4 of the rectifier unit; the output ends of the rectifier modules M3 and M4 are connected in parallel and are electrically connected to the battery unit and the closing busbars +HM and -HM respectively through the battery BMS module M7, and are connected through the output circuit breaker QF-H1...QF-Hn supplies power to the load; the output ends of the rectifier modules M1 and M2 are connected in parallel and electrically connected to the control bus +KM, -KM, and at the same time, the closing bus +HM, -HM is also electrically connected to the control bus +KM, -KM through the DC voltage stabilizing module DMP of the DC voltage stabilizing unit, and the load is supplied with power through the output circuit breaker QF-K1...Kn. When the AC power supply is normal, the control unit controls the M1 and M2 rectifier units to provide power to the control bus +KM, -KM. The DC monitoring unit is connected to the rectifier unit and the DC voltage stabilizing unit through the RS485 communication bus, and is displayed and controlled through the human-computer interaction interface.

2. The high-efficiency energy-saving DC panel according to claim 1 is characterized in that: The DC panel also integrates an AC data acquisition module, a DC data acquisition module, a battery acquisition module, a switch quantity detection module, an insulation detection module, and an integrated automatic control system; the DC monitoring unit is connected to the AC data acquisition module, the DC data acquisition module, the battery acquisition module, the switch quantity detection module, and the integrated automatic control system via an RS485 communication bus.

3. A high-efficiency energy-saving DC panel according to claim 1 or 2, characterized in that: The rear end of the AC dual-circuit power switching unit ATS is equipped with an overvoltage protector TVS.

4. A high-efficiency energy-saving DC panel according to claim 1 or 2, characterized in that: There is current sharing control between the rectifier module M1 and the rectifier module M2, and there is current sharing control between the rectifier module M3 and the rectifier module M4.

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