CN103904776A - Intelligent power distribution room power system - Google Patents

Abstract

An intelligent power distribution room power system, including AC220V power supply system, DC power supply system, energy storage control system, video and security system power system, the intelligent power distribution room power system also includes a battery management unit, integrated power supply box; battery management The units supply power to the DTU, inverter, energy storage control system, switch cabinet indicator light power supply, and communication unit respectively; the DC power supply system is a DC48V battery power supply system; the inverter converts DC48V into AC220V voltage output to supply power for the integrated power supply box; In normal state, the battery management unit is powered by AC220V, and the battery management unit charges the DC48V battery pack. When the AC220V power is cut off, the battery management unit is powered by the DC48V battery pack. The advantages of the present invention are: fault isolation, convenient maintenance, Keep the power supply system stable, economical and practical, technically feasible, and have promotional value.

Description

Intelligent power distribution room power system

technical field

The invention relates to the technical field of power supply, in particular to an intelligent power distribution room power system.

Background technique

There is an existing Chinese utility model patent with the patent number CN201120379556.8 titled "A Data Center Industrial Equipment Power Supply System and Backup High-Voltage DC Power Supply", which discloses a data center IT equipment power supply system and backup high-voltage DC power supply. The system includes a backup high-voltage DC power supply, a storage battery pack, an output power distribution cabinet, a row head power distribution cabinet, and a rack power distribution unit, wherein the storage battery pack is connected to the DC output busbar of the backup high-voltage DC power supply; the The input terminal of the backup high-voltage DC power supply is connected to three-phase AC power, and the output terminal provides power for IT equipment through the output power distribution cabinet, column head cabinet and rack power distribution unit. The backup high-voltage DC power supply includes: AC-DC conversion switch, used It is used to realize the conversion of three-phase AC output and high-voltage DC power output of battery pack. It has the advantages of high efficiency, high reliability, strong compatibility and small investment. However, the device lacks effective fault isolation means, and the power supply recovery function is weak. If a major problem is encountered, it will take a long time to overhaul, and a power failure accident may occur; in addition, the device is suitable for power supply of IT equipment in the data center. The power supply requirements of the intelligent power distribution room have their own particularities, including power output requirements, various types of voltage level requirements, and simultaneous energy storage requirements for multiple energy storage motors. The technical realization of this device also needs further improvement.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intelligent power distribution room that can be used for power-off isolation in the power distribution room, is convenient for maintenance, maintains power supply for a long time during power failure, and ensures the normal operation of the power supply system. Power Systems.

The technical solution adopted by the present invention to solve the above technical problems is: the power supply system of the intelligent power distribution room, including AC220V power supply system, DC power supply system, energy storage control system, video and security system power supply system, characterized in that: the intelligent power distribution room The house power system also includes a battery management unit and an integrated power supply box;

1. The battery management unit supplies power to the DTU, DC48V/AC220V inverter, energy storage control system, switch cabinet indicator light power supply, and communication unit respectively;

2. The DC power supply system is a DC48V battery power supply system;

3. The DC48V/AC220V inverter supplies power to the integrated power supply box, and the DC48V/AC220V inverter refers to converting DC48V into AC220V voltage output;

4. The video includes a DVR video system, a video camera probe, and the security system includes an IP voice phone, smoke detection equipment, flood control alarm equipment, remote light control equipment, and an access control system; the integrated power supply box supplies the DVR video system and video camera respectively Power supply for probes, IP voice phones, smoke detectors, flood control alarms, remote light control devices, and access control systems;

5. In normal state, the battery management unit is powered by AC220V, and the battery management unit charges the DC48V battery pack. When the AC220V power is cut off, the battery management unit is powered by the DC48V battery pack;

6. The DTU is a power distribution automation terminal equipment, the DC refers to direct current, the AC refers to alternating current, and the V represents the unit volt of voltage.

As an improvement, the maximum power of the battery management unit is selected as 1500W, and the parameters and functions of the battery management unit are configured as follows:

As an improvement, the parameter requirements of the inverter are:

As an improvement, the structure of the energy storage control system includes:

1. Install a time relay and a DC contactor in each switch cabinet energy storage circuit. By setting the delay time of the time relay of each switch cabinet, the energy storage motor in each switch cabinet can be operated after a certain delay. sequential start;

2. After the time relay coil detects the DC48V control power supply of the cabinet, after a delay for a period of time, the normally open contact closes and drives the DC contactor. The main contact of the DC contactor connects the energy storage circuit and maintains it, and the energy storage motor starts Work;

3. The action time of the energy storage motor is 12 seconds. The first set is 15 seconds, and the nth set is 15 times n seconds. When the control power supply DC48V loses power, the time relay returns instantaneously, and the contact of the DC contactor cuts off the storage. Can loop and maintain.

As an improvement, the battery in the DC48V battery power supply system uses a fully sealed maintenance-free lead-acid battery. The specification of the power distribution room or switch battery is 12V/65Ah or 12V/100Ah, and 4 batteries are set as a group to provide 48V in series. Voltage.

As an improvement, the DTU working power adopts DC48V, and the AC220V provided by the PT supplies power to the battery management unit, and the battery management unit provides a DC power supply not less than 48V/30A to provide the DTU working power. The PT power cabinet refers to a voltage mutual inductance monitor.

Compared with the prior art, the present invention uses the AC220V power supply system as the power source, the DC power supply system as the backup power system, and integrates the backup power system and the power distribution terminal (DTU); the backup power system includes a battery management unit, Battery packs, inverters, and power distribution terminals and other monitoring equipment are integrated in the same cabinet. The advantage of this structure is that: during normal power supply, the external power supply is input, and the control and operation power of the switch is provided through the battery management unit, and at the same time, power is supplied to network equipment, video and other electrical equipment through the inverter. The external power supply charges the battery pack at the same time; when the external power supply loses power, the battery pack automatically connects through the battery management unit to supply power to the switch circuit and other electrical equipment; the electrical equipment is powered by the battery management unit, even in the event of a power failure In this state, all devices can operate normally within a certain period of time; the unified power management can facilitate output management. When an electrical failure occurs, it can be isolated and repaired without affecting the overall power supply. If a sudden power failure occurs, it can quickly respond and switch to the battery pack for power supply to keep the system power supply stable. In addition, the power supply time is long in the case of power failure, which is convenient for maintenance and replacement. Allow enough time for the operation. The battery management unit is equipped with a fault alarm function, which is convenient to eliminate hidden dangers and ensure that the system is normal. It has a charge management function to avoid parameter drift and avoid mutual interference between each charging module. It also has a discharge management function. When the battery is placed at a certain undervoltage point, the module Perform equalization and floating charge conversion to protect the battery and further ensure the normal operation of the system.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is the basic schematic diagram in Fig. 1;

Fig. 3 is a circuit diagram of the energy storage control part in Fig. 1;

FIG. 4 is a schematic diagram of the configuration of the system in actual application.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 4, the power supply system of the intelligent power distribution room in this embodiment includes an AC220V power supply system, a DC power supply system, an energy storage control system, a video and security system power system, and the power supply system of the intelligent power distribution room also includes Including battery management unit, integrated power supply box;

1. The battery management unit supplies power to the DTU, DC48V/AC220V inverter, energy storage control system, switch cabinet indicator light power supply, and communication unit respectively;

2. The DC power supply system is a DC48V battery power supply system;

3. The DC48V/AC220V inverter supplies power to the integrated power supply box, and the DC48V/AC220V inverter refers to converting DC48V into AC220V voltage output;

4. The video includes a DVR video system, a video camera probe, and the security system includes an IP voice phone, smoke detection equipment, flood control alarm equipment, remote light control equipment, and an access control system; the integrated power supply box supplies the DVR video system and video camera respectively Power supply for probes, IP voice phones, smoke detectors, flood control alarms, remote light control devices, and access control systems;

5. In normal state, the battery management unit is powered by AC220V, and the battery management unit charges the DC48V battery pack. When the AC220V power is cut off, the battery management unit is powered by the DC48V battery pack;

6. The DTU is a power distribution automation terminal equipment, the DC refers to direct current, the AC refers to alternating current, and the V represents the unit volt of voltage.

The present invention will be further described in detail below. The power supply system of the intelligent power distribution room includes AC220V power supply system, DC power supply system, video and security system power supply system, etc., and also includes a battery management unit and an integrated power supply box; DTU, inverter, energy storage controller, switch cabinet indicator light power supply, and communication unit supply power; the DC power supply system is a DC48V battery power supply system; the DC48V/AC220V inverter supplies power to the integrated power supply box, and the DC48V/ AC220V inverter means to convert DC48V into AC220V voltage output; the video includes DVR video system, video camera probe, security defense system includes IP voice phone, smoke detector equipment, flood control alarm equipment, remote light control equipment, door sensor switch (belonging to the access control system, the same below); the integrated power supply box supplies power to the DVR video system, spherical video probe, IP voice phone, smoke detection equipment, flood control alarm equipment, remote light control equipment, and door magnetic switch respectively; in normal state , the battery management unit is powered by AC220V, and the DC48V battery pack is charged by the battery management unit. , the AC refers to alternating current, and the V represents a unit volt of voltage. The maximum power of the battery management unit is preferably 1500W, and the parameters and functions of the battery management unit are configured as follows:

The parameter requirements of the inverter are:

The structure of the energy storage controller includes:

1. Install a time relay and a DC contactor in each switch cabinet energy storage circuit. By setting the delay time of the time relay of each switch cabinet, the energy storage motor in each switch cabinet can be operated after a certain delay. sequential start;

2. After the time relay coil detects the DC48V control power supply of the cabinet, after a delay for a period of time, the normally open contact closes and drives the DC contactor. The main contact of the DC contactor connects the energy storage circuit and maintains it, and the energy storage motor starts Work;

3. The action time of the energy storage motor is 12 seconds. The first set is 15 seconds, and the nth set is 15 times n seconds. When the control power supply DC48V loses power, the time relay returns instantaneously, and the contact of the DC contactor cuts off the storage. Can loop and maintain. The battery in the DC48V battery power supply system uses a fully sealed maintenance-free lead-acid battery. The general battery power distribution room specification is 12V/65Ah, and the large-scale power distribution room and switching station specification battery is 12V/100Ah, and 4 batteries are set as A group, in series to provide 48V voltage. The DTU working power supply adopts DC48V, and the AC220V provided by the PT supplies power to the battery management unit, and the battery management unit provides a DC power supply not less than 48V/30A to provide the DTU working power supply.

Working principle: All electrical equipment is powered by the battery management unit, even in a power-off state, all equipment can operate normally for a certain period of time.

(1) AC 220V power supply system

When the power supply is normal, the AC220V provided by the PT is used as the working power supply. On the one hand, it provides the working power of the smart device and charges the battery at the same time.

(2) DC 48V power supply system

During normal power supply, the AC220V provided by PT supplies power to the battery management unit, and the battery management unit provides a DC power supply not less than 48V/30A to provide DTU working power, control power, energy storage power, switch cabinet indicator light power, communication power, etc.

When the PT is powered off, the battery is powered by the battery management unit, and the battery management unit provides a DC power supply of not less than 48V/30A to provide terminal operating power, control power, energy storage power, switch cabinet indicator light power, communication power, etc.

(3) Video and security system power system

The DC48V/AC220V inverter outputs AC220V to provide the DVR working power and the integrated power supply box input power to ensure the normal operation of the video and security systems under power failure conditions.

The integrated power supply box supplies power for security devices such as video domes, access control systems, water immersion systems, and smoke detection systems.

Description of the system engineering application:

This intelligent power distribution room power supply system can be widely used in public switchgear and power distribution room user engineering, as shown in Figure 4, the intelligent equipment includes optical fiber EPON equipment, distribution automation terminal (DTU), transformer optimization operation device, Video adapter (DVR) and other security equipment (smart speed dome, IP voice phone, smoke detector, flood alarm equipment, remote light control equipment, etc.), which are integrated with the power system in a comprehensive monitoring cabinet.

The battery pack of the power supply system is configured according to DC48V/100Ah, and the voltage transformer (transformer cabinet) provides AC220V power supply, and provides DC48V working power supply and circuit breaker operating power supply and signal for distribution automation terminal (DTU) and transformer optimal operation device through the power supply system Indicates the power supply, and provides various types of working power for other security equipment (smart domes, IP voice phones, smoke detectors, flood control alarm equipment, remote light control equipment, etc.) through the integrated power supply box. The battery pack is equipped with 4 12V batteries, which are connected in series to provide DC48V voltage output. The working power of distribution automation terminal (DTU) and communication device (such as optical fiber ONU) and the operating power of circuit breaker. The DC48V voltage output is also used as the input voltage of the inverter, and the inverter outputs AC220V to provide input for the integrated power supply box. The power supply of other security equipment (smart dome camera, IP voice phone, smoke detector equipment, flood control alarm equipment, remote light control equipment, etc.) is provided by the integrated power supply box. Another type of intelligent power distribution room in Zhoushan area, the circuit breaker uses DC110V operating voltage, at this time, some changes need to be made in the original power system configuration scheme:

(1) The battery pack is equipped with 9 12V batteries, which are connected in series to provide 108V voltage output. The battery management unit provides the main output of DC110V, which is directly used as the operating power supply of the circuit breaker and the input voltage of the inverter;

(2) Add a step-down module from DC110V to DC48V to provide working power for distribution automation terminals (DTU) and communication devices (such as optical fiber ONU);

(3) Adopt DC110V/AC220V type inverter.

Take the power transformation and distribution project of Yujingshanzhuang District, Putuo Branch of Zhoushan Haijing Real Estate Development Co., Ltd. as an example: there is a power distribution room in the project, which is equipped with high-voltage cabinets and distribution automation cabinets; the high-voltage cabinets adopt single-bus wiring. Indoor single-column layout is adopted, with two incoming lines, one for use and one for standby, three outgoing lines, and one side of the voltage transformer cabinet; two SCB10-630KVA transformers are installed in the power distribution room, and the low-voltage single-bus wiring method is used, and a contact cabinet is set; the high-voltage ring The network cabinet adopts XGN66A ring network cabinet series products, and the low-voltage power distribution cabinet adopts GCK series products. The operating power of the circuit breaker and the power of the energy storage motor are DC48V, and the power is taken from the DTU cabinet. According to the requirements of power distribution automation, the three remote functions (SCADA) of remote signaling (YX), telemetry (YC), and remote control (YK) can be realized, and the functions of video and security remote comprehensive monitoring can be realized. The power distribution room of this project is equipped with a special voltage transformer (G6: PT. surge arrester cabinet), which takes power from the 10kV system and reduces the voltage, and provides the maximum power output of AC220V/3000VA for the station. The control power supply, operating power supply, energy storage motor power supply, and signal power supply of the circuit breaker in the switch cabinet all adopt DC48V voltage level, and are equipped with operating mechanisms and auxiliary equipment of corresponding voltage level. The backup power system adopts an intelligent backup power system solution, and the backup power system obtains AC220V power input from a voltage transformer. When the AC220V power supply works normally, the battery management unit outputs DC48V power to the outside through the rectifier module, and at the same time manages the charge and discharge of the storage battery; Stable power supply for a certain period of time.

Configure the battery capacity as 65Ah, the specific calculation is as follows.

1. Verify that it can operate normally within 1 hour

Total Power Required:

The current of the corresponding 48V battery is 775VA/48V=16.15A.

Considering that the power consumption of various brands of components will vary by 20%, the capacity of the battery should be at least greater than 20Ah.

Second, it can be verified by normal monitoring within 8 hours

Since the working time of the energy storage motor is only 15 seconds, the working time of the electric operating mechanism is only 0.5 seconds, and only one operation is required after a power failure, which has almost no impact on the battery capacity, so the remaining stable capacity is:

The current corresponding to the 48V battery is 290VA/48V=6.04A.

Considering that except for accidents caused by force majeure such as earthquakes and floods, other equipment failures can generally be repaired within 8 hours, so the capacity of the battery should be greater than 6.04×8, that is, greater than 48Ah, based on the 8-hour stable load.

Considering the 20% difference in power consumption of various brands of components, the actual error in battery capacity and the decline in capacity caused by aging, the actual battery capacity is selected as 65Ah. According to the technical requirements of the intelligent backup power system, the equipment configuration and electrical interface requirements are fully considered during the secondary design.

The power supply system of the intelligent power distribution room provides the working power supply, switch operation power supply and motor energy storage power supply of all intelligent equipment, switch cabinet indicator light power supply, and AC220V debugging power supply. In the case of PT power failure, it can guarantee to run for more than 8 hours and ensure all switches At least one opening and closing operation of the cabinet, and the indicator light of the switch cabinet indicates normally.

Energy storage control system: refers to the control system that ensures that the energy storage motors take turns to store energy in order not to burn out the power system due to excessive power when multiple energy storage motors store energy at the same time. IP voice telephone: IP: the abbreviation of InternetProtocoi, IP voice telephone is a telephone service opened according to the network technology content stipulated by the international Internet protocol, Chinese translation is Internet telephone or Internet telephone, in simple terms, it is a real-time voice transmission service through the Internet network .

Claims (6)

1. A power supply system for an intelligent power distribution room, including an AC220V power supply system, a DC power supply system, an energy storage control system, a video and security system power supply system, characterized in that: the power supply system for the intelligent power distribution room also includes a battery management unit, Integrated power supply box; 1. The battery management unit supplies power to the DTU, DC48V/AC220V inverter, energy storage control system, switch cabinet indicator light power supply, and communication unit respectively; 2. The DC power supply system is a DC48V battery power supply system; 3. The DC48V/AC220V inverter supplies power to the integrated power supply box, and the DC48V/AC220V inverter refers to converting DC48V into AC220V voltage output; 4. The video includes a DVR video system, a video camera probe, and the security system includes an IP voice phone, smoke detection equipment, flood control alarm equipment, remote light control equipment, and an access control system; the integrated power supply box supplies the DVR video system and video camera respectively Power supply for probes, IP voice phones, smoke detectors, flood control alarms, remote light control devices, and access control systems; 5. In normal state, the battery management unit is powered by AC220V, and the battery management unit charges the DC48V battery pack. When the AC220V power is cut off, the battery management unit is powered by the DC48V battery pack; 6. The DTU is a power distribution automation terminal equipment, the DC refers to direct current, the AC refers to alternating current, and the V represents the unit volt of voltage. 2. The intelligent power distribution room power system according to claim 1, characterized in that: the maximum power of the battery management unit is 1500W, and the parameters and functions of the battery management unit are configured as follows:

3. The intelligent power distribution room power supply system according to claim 1, characterized in that: the parameter requirements of the inverter are: name parameter DC input Rated input voltage (Vdc): 48V Rated input current: 9.8A Allowable range of input DC voltage: working voltage 40V—58.8V, open Machine voltage 42V--57V Feedback noise current ≤ 10% AC bypass input Allowable bypass voltage (Vac): 220±25% Rated input current: 1.8A Bypass transition time: ≤5ms AC output Rated capacity: 500VA Rated output power: 400W Rated output voltage and frequency: 220Vac, 50HZ Rated output current: 1.8A Output voltage accuracy (V): 220±1.5% Output frequency accuracy (Hz): 50±0.1% Waveform distortion rate (THD): ≤3% (linear load) Dynamic response time: 5% (load 0←→100%) 4. The power supply system of an intelligent power distribution room according to claim 1, wherein the structure of the energy storage control system comprises: 1. Install a time relay and a DC contactor in each switch cabinet energy storage circuit. By setting the delay time of the time relay of each switch cabinet, the energy storage motor in each switch cabinet can be operated after a certain delay. sequential start; 2. After the time relay coil detects the DC48V control power supply of the cabinet, after a delay for a period of time, the normally open contact closes and drives the DC contactor. The main contact of the DC contactor connects the energy storage circuit and maintains it, and the energy storage motor starts Work; 3. The action time of the energy storage motor is 12 seconds. The first set is 15 seconds, and the nth set is 15 times n seconds. When the control power supply DC48V loses power, the time relay returns instantaneously, and the contact of the DC contactor cuts off the storage. Can loop and maintain. 5. The intelligent power distribution room power supply system according to claim 1, characterized in that: the battery in the DC48V battery power supply system adopts a fully sealed maintenance-free lead-acid battery, and the battery specification of the power distribution room or switching station is 12V/ 65Ah or 12V/100Ah, and set 4 batteries as a group to provide 48V voltage in series. 6. The intelligent power distribution room power system according to any one of claims 1 to 5, characterized in that: the DTU working power adopts DC48V, and the AC220V provided by the PT power supply cabinet supplies power to the battery management unit, and the battery management unit provides The DC power supply not less than 48V/30A provides the DTU working power supply, and the PT power supply cabinet refers to the voltage transformer.

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