Battery feed emergency quick charging device suitable for distribution network automation terminal and power supply control method

Abstract

The invention relates to the technical field of emergency charging devices, in particular to a battery feed emergency quick charging device suitable for a distribution network automation terminal and a power supply control method. Comprising a switch unit, a transformer and a synthesis unit, the switch unit modulates a first pulsating waveform based on a control signal, the transformer outputs a plurality of pulsating voltages, the synthesis unit synthesizes the plurality of pulsating voltages into a second alternating current, and the second alternating current is connected to the power input module. The absolute value of the positive half-wave peak value voltage of the second alternating current in each period is greater than the absolute value of the negative half-wave trough value voltage; the rapid charging module is combined with a large-current rapid charging strategy, so that the traditional charging time of several hours is shortened to be within 10 minutes, the problem of low charging efficiency of the distribution network automation terminal in a battery feed state is effectively solved, and the fault recovery speed of a power grid is greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of emergency charging devices, and is a battery feeding emergency fast charging device suitable for distribution network automation terminals and a power supply control method. BACKGROUND

[0002] Distribution network automation terminals (such as FTU and DTU) are basic equipment for realizing distribution network automation, and the performance and reliability of the terminals have a decisive influence on whether the entire distribution network automation system can normally operate and play a role. The terminals are usually installed in outdoor environments, such as on a telegraph pole or in a switch cabinet, and are responsible for data collection, monitoring or control of distribution network equipment, especially for realizing fast positioning, isolation and recovery of power supply in non-fault areas in the case of a fault.

[0003] At present, the power supply system of the distribution network automation terminal usually adopts a power supply mode in which a main power supply is combined with a backup power supply; under normal circumstances, the working power supply of the terminal is taken from the secondary side output of a line voltage transformer or nearby low-voltage alternating current; when the main power supply fails, the backup power supply is automatically switched to supply power; the backup power supply mainly adopts a maintenance-free lead-acid storage battery or a super capacitor. Since the lead-acid storage battery has high requirements for the charging and discharging mode and the environmental temperature and has a short service life, the reliability of the lead-acid storage battery in actual operation is not satisfactory. The existing terminal power supply system has several significant problems. When the main power supply fails for a long time, the backup power supply is fed, and conventional charging is manually performed on the control box on site, which is time-consuming and slow, and cannot meet the demand for rapid recovery of power supply. In addition, the distribution terminal is usually located outdoors, and the environment is complex. The main power supply may fail for a long time due to various reasons, causing the backup battery to be deeply discharged. The traditional charging technology adopts a constant current and constant voltage mode, and the charging time is as long as several hours, which cannot meet the reliability requirements of the rapid recovery of power supply of the distribution network. SUMMARY

[0004] The application provides a battery feeding emergency fast charging device suitable for distribution network automation terminals and a power supply control method, which overcomes the shortcomings of the prior art, and effectively solves the problem that the existing charging technology adopts a constant current and constant voltage mode, the charging time is as long as several hours, and the reliability requirements of the rapid recovery of power supply of the distribution network cannot be met.

[0005] One of the technical solutions of the present application is realized by the following measures: a battery feeding emergency rapid charging device suitable for distribution network automation terminal, comprising: a power input module, a rapid charging module connected to the power input module, including a switching unit, a transformer and a synthesis unit, wherein the switching unit modulates the first pulsating waveform based on the control signal, the transformer outputs multiple pulsating voltages, and the synthesis unit synthesizes the multiple pulsating voltages into a second alternating current, and the absolute value of the positive half-wave peak voltage is greater than the absolute value of the negative half-wave valley voltage in each cycle; a battery management module connected to the rapid charging module and the backup battery of the distribution network automation terminal, including a battery core and a protection chip, the protection chip monitors the state of the battery core and triggers overvoltage, overcurrent and overtemperature protection measures; a bidirectional converter connected between the battery management module and the load, realizing the bidirectional flow of electric energy between the battery and the load; a control unit in communication connection with the power input module, the rapid charging module, the battery management module and the bidirectional converter, for real-time monitoring of the power state, the battery charge state and the load demand, generating a control signal to adjust the duty cycle of the switching unit to match the battery charging demand.

[0006] The following is a further optimization or / and improvement of the above-mentioned one of the technical solutions of the present application: The control unit described above configures different charging strategies according to the importance level of the power supply area to which the distribution network automation terminal belongs: for the two-remote terminal of the power supply area, the rapid charging mode is enabled, and when the battery charge state is lower than 50%, 10 minutes of rapid charging is performed, and when the battery reaches 80%, trickle charging mode is adopted.

[0007] The protection measures of the above-mentioned battery management module include overvoltage protection, overcurrent protection, overtemperature protection, low voltage protection, low temperature protection, reverse voltage protection and short circuit protection; when the battery core triggers overvoltage, overcurrent or overtemperature protection during charging, the protection chip closes the charging loop switch; when the battery core triggers overcurrent, overtemperature, low voltage, low temperature, reverse voltage or short circuit protection during discharging, the protection chip closes the discharge loop switch.

[0008] The above-mentioned backup battery provides 220V alternating current for rapid charging through the voltage converter, and its working temperature range is-40℃ to +60℃, and the cycle life is more than 100,000 times.

[0009] The control unit described above supports two working mode switching: grid-connected power supply mode: when the main power is normal, the main power supplies power and charges the battery at a constant voltage; emergency charging mode: when the main power fails and the battery feeds, the rapid charging module is started.

[0010] The second technical solution of the present application is realized by the following measures: A battery feeding emergency rapid power supply control method suitable for distribution network automation terminals, comprising a battery feeding emergency rapid charging device suitable for distribution network automation terminals, the control method comprising: monitoring the main power supply state, the battery charge state and the load state; activating the rapid charging module when the main power supply fails and the battery is in the feeding state; controlling the rapid charging module to output alternating current; matching the charging strategy according to the terminal importance level; monitoring the battery parameters in real time during the charging process, and adjusting or terminating the charging if the protection condition is triggered.

[0011] During the above rapid charging process: through the monitoring of the battery, if the battery charge state is lower than 30%, the emergency rapid charging device performs 10 minutes of rapid charging; if the protection is triggered within 10 minutes or the battery charging state is converted from constant current to constant voltage, the rapid charging is terminated and the battery health state is re-monitored.

[0012] The above charging device is integrated into a mobile energy storage power supply to realize the power supply function of rapid access and seamless switching, and supports series connection, parallel connection and double circuit access mode.

[0013] The present application has the following beneficial effects: 1. By setting the rapid charging module combined with the large current rapid charging strategy, the charging time of several hours is shortened to within 10 minutes, effectively solving the problem of low charging efficiency of the distribution network automation terminal in the battery feeding state, and greatly improving the power failure recovery speed.

[0014] 2. By adopting a differentiated charging strategy based on the importance level of the power supply area, three charging modes of rapid, standard and trickle are configured for terminals of different levels, realizing resource optimization configuration, ensuring rapid power recovery of key terminals, avoiding resource waste caused by overcharging, and significantly improving the intelligent level and economy of power distribution network power supply management.

[0015] 3. Through the protection mechanism with the chip, the working state and load condition of the connected equipment are monitored in real time, load regulation and priority management are automatically performed during emergency power supply, and comprehensive protection measures such as overvoltage, overcurrent and overtemperature are provided, effectively preventing equipment overload damage, ensuring the safety of the charging process and the reliability of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a charging device structure perspective view of the present application; Figure 2 is a device overall assembly framework flowchart of the present application; Figure 3 This is a framework diagram of the intelligent charging control method of the present invention; Figure 4 This is a diagram illustrating the activation framework of the battery protection mechanism of the present invention. Figure 5 This is a diagram of the intelligent load management decision framework of the present invention. Detailed Implementation

[0017] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0018] Example 1: As Figures 1-5 As shown, the battery emergency fast charging device for distribution network automation terminals includes: a power input module configured to receive AC mains power input, rectify the AC power, and output a DC voltage with a first pulsating waveform; A fast charging module, connected to the power input module, includes a switching unit, a transformer, and a synthesis unit. The switching unit modulates the first pulsating waveform based on a control signal. The transformer outputs multiple pulsating voltages. The synthesis unit synthesizes the multiple pulsating voltages into a second AC current. The absolute value of the peak voltage of the positive half-wave of the second AC current is greater than the absolute value of the valley voltage of the negative half-wave in each cycle. The battery management module, connected to the backup battery of the fast charging module and the distribution network automation terminal, includes battery cells and a protection chip. The protection chip monitors the status of the battery cells and triggers overvoltage, overcurrent, and overtemperature protection measures. The bidirectional converter is connected between the battery management module and the load to realize bidirectional flow of electrical energy between the battery and the load. The control unit communicates with the power input module, fast charging module, battery management module, and bidirectional converter to monitor the power status, battery charge status, and load demand in real time, and generate control signals to adjust the duty cycle of the switching unit to match the battery charging demand.

[0019] The control unit configures differentiated charging strategies based on the importance level of the power supply area to which the distribution network automation terminal belongs: for the remote control terminals in the power supply area, a fast charging mode is enabled, and a 10-minute fast charge is performed when the battery charge is below 50%, and a trickle charging mode is adopted when the battery reaches 80%.

[0020] The battery management module's protection measures include overvoltage protection, overcurrent protection, overtemperature protection, undervoltage protection, low temperature protection, reverse voltage protection, and short circuit protection. When overvoltage, overcurrent, or overtemperature protection is triggered during battery cell charging, the protection chip shuts off the charging circuit switch. When overcurrent, overtemperature, undervoltage, low temperature, reverse voltage, or short circuit protection is triggered during battery cell discharging, the protection chip shuts off the discharging circuit switch.

[0021] The backup battery provides 220V alternating current for fast charging through a voltage converter, and has a working temperature range of -40 to +60 DEG C and a cycle life of more than 100,000 times.

[0022] The control unit supports switching between two working modes: grid-connected power supply mode: the main power supply is powered by the main power supply and the battery is constantly charged; emergency charging mode: the main power supply fails and the battery is powered.

[0023] Embodiment 2: A battery-powered emergency fast power supply control method suitable for distribution network automation terminals, the specific implementation process is as follows: The control method comprises: Monitoring the main power supply state, battery charge state and load state; When the main power supply fails and the battery is in a powered state, activate the fast charging module; Control the output of the fast charging module; According to the importance level of the terminal, match the charging strategy; In the charging process, real-time monitoring of battery parameters, if the protection condition is triggered, adjust or terminate the charging.

[0024] In the above fast charging process: Through monitoring of the battery, if the battery charge state is less than 30%, the emergency fast charging device performs 10 minutes of fast charging; If the protection is triggered within 10 minutes or the battery charge state is converted from constant current to constant voltage, terminate the fast charging and re-monitor the battery health state.

[0025] The above charging device is integrated into a mobile energy storage power supply to realize the function of fast access and seamless switching of power supply, and supports series, parallel and double-circuit access modes.

[0026] For the two-remote terminals in the power supply area, when the battery charge state is detected to be less than 30%, the fast charging mode is immediately started, and the control unit adjusts the switch fast charging duration to 10 minutes, and the power is expected to be 80%. In this process, the protection chip performs bidirectional monitoring, and if a fault occurs, the charging switch is turned off to ensure that the device does not fail due to charging. By setting the fast charging module and combining the large-current fast charging strategy, the traditional charging time of several hours is shortened to within 10 minutes, effectively solving the problem of low charging efficiency of distribution network automation terminals in the battery-powered state, and greatly improving the power failure recovery speed.

[0027] The above technical features respectively constitute embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or subtracted according to actual needs to meet the needs of different situations.

Claims

1. A battery emergency fast charging device suitable for distribution network automation terminals, characterized in that, include: A power input module and a fast charging module are connected to the power input module. The power input module includes a switching unit, a transformer, and a combining unit. The switching unit modulates the first pulsating waveform based on a control signal. The transformer outputs multiple pulsating voltages. The combining unit combines the multiple pulsating voltages into a second AC current. The absolute value of the peak voltage of the positive half-wave of the second AC current is greater than the absolute value of the trough voltage of the negative half-wave in each cycle. A battery management module is connected to the fast charging module and the backup battery of the distribution network automation terminal. It includes battery cells and a protection chip. The protection chip monitors the status of the battery cells and triggers overvoltage, overcurrent, and overtemperature protection measures. A bidirectional converter is connected between the battery management module and the load to realize bidirectional flow of electrical energy between the battery and the load. A control unit is communicatively connected to the power input module, the fast charging module, the battery management module, and the bidirectional converter. It is used to monitor the power status, battery charge status, and load demand in real time, and generate control signals to adjust the duty cycle of the switching unit to match the battery charging demand.

2. The battery emergency fast charging device for distribution network automation terminals according to claim 1, characterized in that, The control unit configures differentiated charging strategies based on the importance level of the power supply area to which the distribution network automation terminal belongs: for the remote control terminals in the power supply area, a fast charging mode is enabled, and a 10-minute fast charge is performed when the battery charge is below 50%, and a trickle charging mode is adopted when the battery reaches 80%.

3. The battery emergency fast charging device for distribution network automation terminals according to claim 1 or 2, characterized in that, The battery management module's protection measures include overvoltage protection, overcurrent protection, overtemperature protection, undervoltage protection, low temperature protection, reverse voltage protection, and short circuit protection; when overvoltage, overcurrent, or overtemperature protection is triggered during battery cell charging, the protection chip shuts off the charging circuit switch. When the battery cell triggers overcurrent, overtemperature, low voltage, low temperature, reverse voltage, or short circuit protection during discharge, the protection chip shuts off the discharge circuit switch.

4. The battery emergency fast charging device for distribution network automation terminals according to claim 3, characterized in that, The backup battery provides 220V AC power for fast charging via a voltage converter. Its operating temperature range is -40℃ to +60℃, and its cycle life is over 100,000 cycles.

5. The emergency fast charging device for battery power supply in a distribution network automation terminal according to claim 1, 2, or 4, characterized in that, The control unit supports switching between two operating modes: Grid-connected power supply mode: When the main power supply is normal, it supplies power and charges the battery at a constant voltage. Emergency charging mode: The fast charging module is activated when the main power supply fails and the battery is depleted.

6. The battery emergency fast charging device for distribution network automation terminals according to claim 3, characterized in that, The control unit supports switching between two operating modes: Grid-connected power supply mode: When the main power supply is normal, it supplies power and charges the battery at a constant voltage. Emergency charging mode: The fast charging module is activated when the main power supply fails and the battery is depleted.

7. A battery emergency rapid power supply control method for distribution network automation terminals, comprising the battery emergency rapid charging device for distribution network automation terminals as described in claims 1-6, characterized in that, The control method includes: Monitor the status of the main power supply, battery charge status, and load status; When the main power supply fails and the battery is in a depleted state, the fast charging module is activated. Control the output AC power of the fast charging module; Charging strategies are matched based on the importance level of the terminal; The battery parameters are monitored in real time during charging, and the charging is adjusted or terminated if protection conditions are triggered.

8. The emergency rapid power supply control method for battery power supply in distribution network automation terminals according to claim 7, characterized in that, During fast charging: By monitoring the battery, if the battery charge level is below 30%, the emergency fast charging device will perform a 10-minute fast charge. If protection is triggered within 10 minutes or the battery charging state changes from constant current to constant voltage, fast charging will be terminated and the battery health status will be re-monitored.

9. The emergency rapid power supply control method for battery power supply in distribution network automation terminals according to claim 8, characterized in that, The charging device is integrated into the mobile energy storage power supply, enabling rapid access and seamless switching of power supply functions, and supporting series, parallel and dual-circuit access modes.

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