CN110752580B - Connection box power supply system and method for submarine observation network - Google Patents
Connection box power supply system and method for submarine observation network Download PDFInfo
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- CN110752580B CN110752580B CN201810810791.2A CN201810810791A CN110752580B CN 110752580 B CN110752580 B CN 110752580B CN 201810810791 A CN201810810791 A CN 201810810791A CN 110752580 B CN110752580 B CN 110752580B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
Abstract
The invention relates to a connection box power supply system and method for a submarine observation network, which are used for supplying and distributing required electric energy for control equipment inside a connection box of the submarine observation network and a measuring instrument hung outside the connection box. The device comprises a controller, a power conversion circuit, an energy storage battery pack, a power distribution circuit and a detection and protection circuit. The controller is responsible for the operation control and the state monitoring of the whole power supply system; the power supply conversion circuit can convert high voltage into low voltage for direct use by electric equipment; the energy storage battery pack can automatically provide electric energy for the electric equipment of the junction box under the condition of no external electric energy input, and the system operation is maintained; the power distribution, detection and protection circuit can control the electric equipment on the connection box, detect the power consumption state of each loop in real time, provide protection measures in hardware and software aspects, accurately judge fault reasons and timely respond when faults such as overcurrent and short circuit occur, and ensure the power consumption safety of the equipment on the connection box.
Description
Technical Field
The invention relates to power supply of submarine observation equipment, in particular to a connection box power supply system and method for a submarine observation network.
Background
With the increasing demand for exploration and utilization of oceans, the way of ocean observation is increasing, and the observation range also extends from the sea surface to the seabed. The seabed observation network is ocean equipment which is used in deep sea and can continuously carry out in-situ observation in real time for a long time. If the ground and the sea are regarded as the first observation platform of the earth science, and the aerial remote sensing is regarded as the second observation platform, the observation system built on the sea bottom is the third observation platform.
The submarine observation network is essentially a submarine laboratory, which mainly comprises a shore base station on land and a submarine junction box which are connected through a photoelectric composite cable. The docking box can carry different measuring instrument devices according to different working places and different functions. A typical seafloor observatory net structure is shown in figure 1. The shore base station is mainly responsible for providing electric energy for the whole network, and meanwhile, the shore base station control computer is in communication with the underwater network equipment and the controller, so that control instructions can be issued, and data can be acquired and stored in real time. The junction box is an important observation node in the system and is divided into a main junction box and a secondary junction box according to different positions and functions in the network. The main connection box is connected with the main photoelectric composite cable and is a control center of the underwater partial network. The main junction box can output larger power and higher output voltage, and can be used for cascading other junction boxes. The secondary junction box is typically located on a trunk of an observation network on which various measuring devices can be carried for site-specific hydrological parameter measurements. The secondary connection box can provide different power supply and communication interfaces for the equipment, and transmits the information collected by the equipment back to the shore base station.
Because the connection box works on the seabed and is responsible for controlling a large amount of electric equipment, a power supply system in the connection box has strong reliability firstly, so that the equipment can work continuously for a long time, secondly, the voltage and current states of all key parts can be detected in real time, and complete hardware and software protection measures are provided again, so that the connection box can accurately respond to different faults, and the power utilization safety of the power supply system and the whole connection box system is ensured.
Disclosure of Invention
Aiming at the control and communication of a junction box of a submarine observation network and the power supply and distribution requirements of external detection equipment, the invention provides a junction box power supply system for the submarine observation network, which provides various voltage outputs, ensures that a hardware and software protection program is quickly started when a power supply line fails, cuts off a failure link and ensures the safety of the power supply system.
The technical scheme adopted by the invention for realizing the purpose is as follows: a connection box power supply system for a submarine observation network comprises a controller, a power supply conversion circuit, an energy storage battery pack circuit, a power supply distribution circuit and a power supply detection and protection circuit;
the energy storage battery pack circuit is connected with an external high-voltage power supply, a power supply conversion circuit and a high-voltage power supply distribution circuit and supplies the internally stored high-voltage power supply to the power supply conversion circuit or the high-voltage power supply distribution circuit;
the power supply conversion circuit is connected with an external high-voltage power supply and a plurality of low-voltage power supply distribution circuits, converts external high-voltage power into different low-voltage power and outputs the different low-voltage power to the plurality of low-voltage power supply distribution circuits;
the power distribution circuit comprises a plurality of high-voltage and low-voltage power distribution circuits, is connected with the underwater electric equipment, and controls the on-off of the high-voltage or low-voltage power distribution circuits through an internal relay; the high-voltage power supply distribution circuit is also directly connected with an external high-voltage power supply and provides the external high-voltage power supply for electric equipment.
The power supply detection and protection circuit is arranged on each power supply distribution circuit and is connected with the controller, and is used for detecting the current signal of each power supply distribution circuit and the control signal of the receiving controller, comparing the current signal with the control signal through the internal comparator and outputting a switching-off driving signal to the relay of each power supply distribution circuit;
and the controller is connected with the power supply detection and protection circuit, the electric equipment and an upper computer of the shore base station, receives instructions of the upper computer, controls the on-off of each power supply distribution circuit and communicates with the electric equipment.
The energy storage battery pack circuit is obtained by connecting a plurality of lead-acid battery packs in series.
And diodes are arranged at the charging and discharging interfaces of the energy storage battery pack circuit.
An AC/DC power supply module is arranged in the power conversion circuit, and an external 375V high-voltage power supply is reduced to 12V, 24V and 48V.
And the input end of each power distribution circuit is provided with a diode for blocking reverse voltage.
The power detection and protection circuit comprises:
the feedback voltage value of the current signal is connected with the positive input end of a first operational amplifier U1A through a resistor R1, a resistor R2 and a capacitor C1 are connected between the positive input end and the ground in parallel, the reverse input end is connected with the output end, the output signal of the first operational amplifier U1A is connected with the reverse input end of a first comparator U2A through a resistor R3, and the output signal is compared with a reference signal 1 at the positive input end of a first comparator U2A to output a first comparison signal; the reverse input end of the first comparator U2A is connected with a 15V power supply through a diode D1, and is grounded after being connected in parallel with a capacitor C4 through a diode D2;
the feedback voltage value of a control signal of the controller is connected with the positive input end of a second operational amplifier U1B through a resistor R4, a resistor R5 and a capacitor C5 are connected between the positive input end and the ground in parallel, the reverse input end is connected with the output end, an output signal of the second operational amplifier U1B is connected with the positive input end of a second comparator U2B through a resistor R6 and is compared with a reference signal 2 at the reverse input end of the second comparator U2B to output a second comparison signal; the positive input end of the second comparator U2B is connected with a 15V power supply through a diode D7, and is grounded after being connected in parallel through a diode D8 and a capacitor C6;
the output ends of the first comparator U2A and the second comparator U2B are connected with a 15V power supply through a resistor R7; and when the first comparison signal and the second comparison signal are both high voltage, outputting a switching-off driving signal to the relay of each power distribution circuit.
The controller adopts a single chip or a digital signal processor; the controller comprises a processor, and an analog-to-digital conversion module, a digital quantity output module, an input capture module, a timing counting module, a serial peripheral interface and a CAN bus which are respectively connected with the processor; the analog-to-digital conversion module acquires current signals of each power distribution circuit to the processor through the power detection and protection circuit and is used for detecting the working state of each power distribution circuit in real time; the digital quantity output module outputs a control signal to the power supply detection and protection circuit so as to control the on-off of the relay of each power supply distribution circuit; the input capturing module is used for acquiring a level signal of the short-circuit fault to the processor; the timing counting module is used for timing overcurrent faults of the power distribution circuit; the serial peripheral interface is connected with the shore base station upper computer and the electric equipment, the CAN bus is connected with the electric equipment, and the communication between the processor and the shore base station upper computer and the electric equipment is realized.
A docking box power supply method for a submarine observation network comprises the following steps:
the controller collects current signals of each power distribution circuit in real time through the power detection and protection circuit and judges whether a short-circuit fault occurs or not;
if so, outputting a turn-off control signal to a relay of the corresponding power distribution circuit to turn off the current power supply loop; otherwise, judging whether an overcurrent fault occurs according to the acquired current signal;
if judging that the short-time overcurrent exists, resetting the count; otherwise, when the accumulated count reaches the threshold value through the timing counting module, a turn-off control signal is output to a relay of the corresponding power distribution circuit to turn off the current power supply loop, so that short circuit and overcurrent fault protection is realized.
The controller collects current signals of each power distribution circuit in real time through the power detection and protection circuit, and judges whether short-circuit faults occur or not as follows: the power supply detection and protection circuit collects current signals of each power supply distribution circuit in real time, the input capture module of the controller converts the current signals into level signals and sends the level signals to the processor, and the processor judges whether short-circuit faults occur or not.
The invention has the following beneficial effects and advantages:
1. the invention can provide voltage outputs of 12V, 24V and 48V and can provide electric energy interfaces for equipment with different working voltages.
2. The invention can quickly start hardware and software protection programs when the power supply line has a fault, cut off the fault link and ensure the safety of the power supply system.
3. The invention comprises the energy storage battery pack, and the power supply system can still maintain the normal work of the electric equipment under the condition that the connection box can not obtain energy from a shore base.
4. The invention has smaller element and circuit volume, is suitable for being used under the condition of special requirements on space, and has convenient and reliable connection and use.
Drawings
FIG. 1 is a diagram of a typical subsea observation network architecture;
FIG. 2 is a schematic diagram of the system of the present invention;
FIG. 3 is a schematic diagram of the circuit connection of the energy storage battery pack of the present invention;
FIG. 4 is a power conversion circuit diagram of the present invention;
FIG. 5 is a schematic diagram of a detection and protection circuit employed in the present invention;
FIG. 6 is a flow chart of software protection employed by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the power supply system of the junction box can provide required electric energy for communication and control equipment inside the junction box of the seafloor observation network and a measuring instrument hung outside the junction box.
As shown in fig. 2, the power supply system of the docking box includes a controller, a power conversion circuit, an energy storage battery pack, a power distribution circuit, a power detection circuit, and a protection circuit. The controller is responsible for the operation control and the state monitoring of the whole power supply system; the power supply conversion circuit can convert high voltage into low voltage for direct use by electric equipment; the energy storage battery pack can automatically provide electric energy for the electric equipment of the junction box under the condition of no external electric energy input, and the system operation is maintained; the distribution, detection and protection circuit can control the electric equipment on the connection box, detect the power consumption state of each loop in real time, provide protection measures in the aspects of hardware and software, accurately judge fault reasons and timely respond when faults such as overcurrent, short circuit, overvoltage and undervoltage occur, and ensure the power consumption safety of the equipment on the connection box.
The controller adopts a minimum control system taking a dsPIC33FJ128MC706 chip as a core, combines the control characteristics of a singlechip with the high operational capability of a digital signal processor, and provides guarantee for high-precision control. The controller has the operation precision of 16-bit data, can execute instructions at the speed of 40MHz at the fastest speed, and integrates a 128kb flash program memory and a 16kb RAM, wherein the controller comprises a 2kb DMA RAM. In addition, the controller has an engine with a digital signal processor DSP, has two 40-bit accumulators, supports division operations, and has a plurality of data addressing modes. Has flexible and rapid interrupt processing capability. Allowing CPU-less transfer of data between the peripheral device and the dedicated DMA RAM. The controller comprises a plurality of peripheral modules, and guarantees are provided for simplification of peripheral hardware circuits. The system comprises functions of timing counting, input capturing, digital quantity output, a serial peripheral interface, a CAN bus, analog-to-digital conversion and the like, and CAN well meet the requirement of control resources. The digital output of the controller is connected with the power supply detection and protection circuit, and a control signal is output to the coil end of each relay through the power supply detection and protection circuit, so that the switching state of each path is controlled; the analog-to-digital conversion interface of the controller is connected with the detection protection circuit, and current feedback signals of corresponding circuits are acquired and used for detecting the working state of the circuit in real time. The input captures a level signal for acquiring a short-circuit fault to the processor; the timing count is used for timing overcurrent faults of the power distribution circuit; the serial peripheral interface is connected with the shore base station upper computer and the electric equipment, the CAN bus is connected with the electric equipment, and the communication between the processor and the shore base station upper computer and the electric equipment is realized.
The front end input of the power conversion circuit is connected with an external power supply and the energy storage battery pack, the rear end output of the power conversion circuit is connected with electric equipment, and the power conversion circuit can convert input 375V direct current into different low voltages to be output for the equipment to use. The output voltage includes 12V DC, 24V DC and 48V DC. The 12V power supply loop can provide 300W power, and the maximum output current is 25A; the 24V power supply loop can provide 300W power, and the maximum output current is 12.5A; the 48V power supply loop can provide 300W of power, and the maximum output current is 6.25A. As shown in fig. 4, the input end is connected to the input end of the AC/DC power module through a first inductor L1(3mH) and a second inductor L2(3mH), the two ends of the first inductor L1 and the second inductor L2 are connected to a first capacitor C1(0.01uF) and a second capacitor C2(330uF/450V), and a third capacitor C3(1uF) and a fourth capacitor C4(470uF/50V) are connected in parallel between the positive and negative electrodes of the output end of the AC/DC power module.
The energy storage battery pack may provide electrical power to the devices within the docking pod without an external power supply. The internal composition is shown in figure 3. The battery pack is composed of lead-acid batteries, the output voltage of a single lead-acid battery is 12V, and the capacity of the single lead-acid battery is 21 Ah. The number of the batteries connected in series is 32, and the total rated output voltage is 384V. The battery pack provides charge and discharge interfaces to the outside and isolates the charge and discharge process through the two-diode module at T1. And a fuse is connected with the negative end of the output of the battery pack, so that the damage of a short-circuit fault to a system is prevented.
The power distribution circuit consists of a relay and a corresponding diode element, and as shown in FIG. 2, the S1 relay is responsible for the charge state control of the energy storage battery pack; the S2 relay is responsible for the power supply relation between the energy storage battery and the power supply conversion circuit; the S3 relay is used for 375V external output control when external power supply exists; the S4 relay is used for controlling the on-off when the energy storage battery pack is used for providing a 375V power supply to the outside; the S5 relay is used for controlling the power on and power off of 12V equipment; the S6 relay is used for controlling the power on and power off of 24V equipment; the S7 relay is used for power on and power off control of 48V equipment. Diodes (D1-D4) in the line are used to block reverse voltages that may occur everywhere.
The power detection and protection circuit is located at the front end of each power supply interface and used for measuring the voltage and current states in the loop, and when abnormality occurs, the power supply of the loop is stopped, the detection and protection circuit has the composition principle shown in fig. 5, and the circuit can simultaneously acquire a control signal and a current feedback signal in a circuit. The voltage range of the signal is adjusted by adopting an operational amplifier, the adjusted signal is compared with the reference voltage by a comparator, and only when two paths of signals meet the requirement simultaneously, the driving signal is output to close the relay. The method specifically comprises the following steps: the feedback voltage value of the current signal is divided by resistors R1 and R2 and then input to the positive input end of the first operational amplifier U1A, and the voltage of the output end and the voltage of the input end are kept the same by connecting the reverse input end and the output end of the first operational amplifier U1A, but the signal has stronger driving capability at the moment. The output signal of the first operational amplifier U1A is transmitted to the inverting input terminal of the first comparator U2A through the resistor R3 to be compared with the reference signal 1 at the forward input terminal, and when the output signal voltage of the first operational amplifier U1A is less than the reference signal 1, the measured current value is considered to be in the normal working range, and the first comparator U2A outputs a high voltage. Similarly, the control signal is modulated similarly, except that the signal output from the second operational amplifier U1B is transmitted to the positive input of the second comparator U2B, and then compared with the reference signal 2 at the negative input, and the second comparator U2B outputs a high voltage when the output signal of the second operational amplifier U1B is higher than the reference signal 2. Therefore, only when the two comparators output high voltage simultaneously, the driving signal can be changed into high voltage, and then the relay at the rear end is driven to work. The model of the first operational amplifier U1A and the model of the second operational amplifier U1B are TL084, and the model of the first comparator U2A and the model of the second comparator U2B are LM 239. The diodes D1, D2, D3 and D4 are used to control the voltage range of the signals between 0 and 15V. The values of the components are that the resistors R1, R2, R4 and R5 are 10k ohms, and the resistors R3 and R6 are 150 ohms. The capacitors C1 and C5 are 68 picofarads, C2 and C3 are 0.1 microfarads, and C4 and C6 are 1000 picofarads.
As shown in fig. 6, the program running in the controller can provide software protection for the power supply system in the event of short circuit and overcurrent faults. The controller can acquire the current condition in the current line fed back by the current sensor in real time, and when a short-circuit fault is detected, the system immediately cuts off a power supply loop; when overcurrent faults are detected, the system can count faults, if the system is recovered to be normal within a specified time, the system is judged to be short-time overcurrent, the counting is cleared, otherwise, the system is considered to be abnormal when a long-time overcurrent phenomenon occurs, a power supply loop is cut off, and the system is ready to be checked.
Claims (6)
1. A connection box power supply system for a submarine observation network is characterized by comprising a controller, a power supply conversion circuit, an energy storage battery pack circuit, a power supply distribution circuit and a power supply detection and protection circuit;
the energy storage battery pack circuit is connected with an external high-voltage power supply, a power supply conversion circuit and a high-voltage power supply distribution circuit and supplies the internally stored high-voltage power supply to the power supply conversion circuit or the high-voltage power supply distribution circuit;
the power supply conversion circuit is connected with an external high-voltage power supply and a plurality of low-voltage power supply distribution circuits, converts external high-voltage power into different low-voltage power and outputs the different low-voltage power to the plurality of low-voltage power supply distribution circuits;
the power distribution circuit comprises a high-voltage power distribution circuit and a low-voltage power distribution circuit, is connected with the underwater electric equipment, and controls the on-off of the high-voltage power distribution circuit or the low-voltage power distribution circuit through an internal relay; the high-voltage power supply distribution circuit is also directly connected with an external high-voltage power supply and provides the external high-voltage power supply for the electric equipment;
the power supply detection and protection circuit is arranged on each power supply distribution circuit and is connected with the controller, and is used for detecting the current signal of each power supply distribution circuit and the control signal of the receiving controller, comparing the current signal with the control signal through the internal comparator and outputting a switching-off driving signal to the relay of each power supply distribution circuit; the power detection and protection circuit comprises:
the feedback voltage value of the current signal is connected with the positive input end of a first operational amplifier U1A through a resistor R1, a resistor R2 and a capacitor C1 are connected between the positive input end and the ground in parallel, the reverse input end is connected with the output end, the output signal of the first operational amplifier U1A is connected with the reverse input end of a first comparator U2A through a resistor R3, and the output signal is compared with a reference signal 1 at the positive input end of a first comparator U2A to output a first comparison signal; the reverse input end of the first comparator U2A is connected with a 15V power supply through a diode D1, and is grounded after being connected in parallel with a capacitor C4 through a diode D2;
the feedback voltage value of a control signal of the controller is connected with the positive input end of a second operational amplifier U1B through a resistor R4, a resistor R5 and a capacitor C5 are connected between the positive input end and the ground in parallel, the reverse input end is connected with the output end, an output signal of the second operational amplifier U1B is connected with the positive input end of a second comparator U2B through a resistor R6 and is compared with a reference signal 2 at the reverse input end of the second comparator U2B to output a second comparison signal; the positive input end of the second comparator U2B is connected with a 15V power supply through a diode D7, and is grounded after being connected in parallel through a diode D8 and a capacitor C6;
the output ends of the first comparator U2A and the second comparator U2B are connected with a 15V power supply through a resistor R7; when the first comparison signal and the second comparison signal are both high voltage, outputting a switching-off driving signal to a relay of each power distribution circuit;
and the controller is connected with the power supply detection and protection circuit, the electric equipment and an upper computer of the shore base station, receives instructions of the upper computer, controls the on-off of each power supply distribution circuit and communicates with the electric equipment.
2. A docking pod power supply system for a subsea observation network according to claim 1, wherein said energy storage battery circuit is obtained by connecting a plurality of lead-acid batteries in series.
3. A docking pod power supply system for a subsea observation network as claimed in claim 2, wherein diodes are provided at the charging and discharging interfaces of said energy storage battery pack circuit.
4. A docking box power supply system for a subsea observation network as in claim 1, wherein said power conversion circuit is internally a DC/DC power module, stepping down an external 375V high voltage power supply to 12V, 24V, 48V.
5. A docking box power supply system for a subsea observation network according to claim 1, wherein each of said power distribution circuit inputs is provided with a diode for blocking reverse voltage.
6. A docking pod power supply system for a subsea observation network as in claim 1, wherein said controller employs a single chip or digital signal processor; the controller comprises a processor, and an analog-to-digital conversion module, a digital quantity output module, an input capture module, a timing counting module, a serial peripheral interface and a CAN bus which are respectively connected with the processor; the analog-to-digital conversion module acquires current signals of each power distribution circuit to the processor through the power detection and protection circuit and is used for detecting the working state of each power distribution circuit in real time; the digital quantity output module outputs a control signal to the power supply detection and protection circuit so as to control the on-off of the relay of each power supply distribution circuit; the input capturing module is used for acquiring a level signal of the short-circuit fault to the processor; the timing counting module is used for timing overcurrent faults of the power distribution circuit; the serial peripheral interface is connected with the shore base station upper computer and the electric equipment, the CAN bus is connected with the electric equipment, and the communication between the processor and the shore base station upper computer and the electric equipment is realized.
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| CN109713658B (en) * | 2019-01-16 | 2019-11-15 | 中国科学院声学研究所 | A kind of submarine observation network master base station based on constant current-supplying |
| CN111327974A (en) * | 2020-03-05 | 2020-06-23 | 深圳欧特海洋科技有限公司 | Seabed observation network redundancy system based on ring network topology structure and use method |
| CN112421707B (en) * | 2020-10-22 | 2022-10-21 | 大连理工大学 | Electric energy scheduling method for underwater power supply system |
| CN112260259A (en) * | 2020-10-22 | 2021-01-22 | 大连理工大学 | Underwater power supply system with tree-shaped topological structure |
| CN113629812A (en) * | 2021-08-12 | 2021-11-09 | 电子科技大学 | Power distribution device with energy storage and voltage stabilization functions |
| CN113933738B (en) * | 2021-09-08 | 2024-04-16 | 国网甘肃省电力公司电力科学研究院 | Monitoring method and device for switching power supply |
| CN116054318B (en) * | 2022-12-05 | 2023-10-13 | 中国科学院声学研究所 | Deep sea high-power supply system |
| CN115864605B (en) * | 2023-02-08 | 2023-05-16 | 广州里工实业有限公司 | Power supply distribution device and distribution method for mobile robot, robot and medium |
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| CN104297627A (en) * | 2013-07-15 | 2015-01-21 | 通用电气公司 | Method and system for control and protection of direct current subsea power systems |
| CN105429227A (en) * | 2015-12-16 | 2016-03-23 | 浙江大学 | Battery management and control system for underwater vehicle |
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| CN110752580A (en) | 2020-02-04 |
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