CN104682556A - Remote intelligent maintenance system for direct current power supply of transformer substation and application of remote intelligent maintenance system - Google Patents
Remote intelligent maintenance system for direct current power supply of transformer substation and application of remote intelligent maintenance system Download PDFInfo
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- CN104682556A CN104682556A CN201410773533.3A CN201410773533A CN104682556A CN 104682556 A CN104682556 A CN 104682556A CN 201410773533 A CN201410773533 A CN 201410773533A CN 104682556 A CN104682556 A CN 104682556A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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Abstract
The invention relates to a remote intelligent maintenance system for a direct current power supply of a transformer substation. The remote intelligent maintenance system comprises the direct current power supply, wherein the input end of the direct current power supply is connected with an alternating current power distribution end; the output end of the direct current power supply is connected with a direct current power distribution end; the direct current power supply comprises charging and discharging modules 1-n; the charging and discharging modules 1-n are respectively connected with storage battery packs 1-n; the storage battery packs 1-n are connected with battery monitoring modules 1-n; the battery monitoring modules comprise voltage monitoring modules, circuit monitoring modules and internal resistance test modules; the battery monitoring modules are then connected with a monitoring module, and the monitoring module is connected with a control terminal. The control terminal performs remote communication with concentrated monitoring modules of all branch station direct current systems; after receiving a monitoring command sent by the control terminal, the monitoring modules of all the branch station direct current systems can complete data acquisition and control operation on direct current systems and send back results to the remote control terminal, so that unattended and real-time concentrated monitoring and remote maintenance of direct current equipment are realized.
Description
Technical field
The application relates to a kind of remote and intelligent maintenance system of transforming plant DC power supply, and in DC power supply monitoring and the application in safeguarding.
Background technology
In electric power system, in order to give the electricity consumption of control, protection, automatics, emergency lighting and various DC equipment, reliable DC power supply must be had.Therefore be equipped with independently DC power supply batteries and charging supporting with it, float charger in power plant and transformer station, be called for short DC power system.For the circuit breaker in transformer station provides and lock DC power supply when its effect is normal.During fault, when factory, electricity consumption of standing are interrupted, the station-service machinery dragged for relaying protection and automatics, circuit breaker and lock and tripping operation, carrier communication, power plant DC motor provides DC power supply.Therefore the DC power system of transformer station be relaying protection, the basic guarantee that correctly starts of automatics and circuit breaker, its stable operation is badly damaged most important to preventing system destruction, fault spread and equipment.
Each transformer station all Attended modes of past electric power system, make regular check on the running status of DC equipment, and Timeliness coverage also processes its anomaly occurred, ensures the safe and stable operation of transformer station.Unattended substation is promoted in current electric power system, although control centre can obtain the real time information of substation operation situation by telecontrol channel, but a small amount of important information can only be obtained for direct current component, the details that direct current system is run cannot be reflected, need plant maintenance personnel to make regular check on it.In addition, the control run DC equipment is also carry out execute-in-place by attendant.
The revolution of electronic technology, computer technology, network technology, design philosophy, makes transformer station's digitlization, unattended realization progressively becomes a reality.In current electric power system, various electric equipment realizes remote monitoring gradually, and the remote online of DC power system and supervisory control system itself monitors without perfect embodiment and technological means, will directly affect overall automatization level.
Wide for compass of competency in electric power system, transformer station is many, attendant is few, far away, actual conditions difficult in maintenance, substantially cannot ensure to complete according to quantity making regular check on and maintenance DC equipment and storage battery thereof, these problems all bring potential safety hazard to power system power supply safety and reliability on schedule.
In transformer station, DC power-supply system generally adopts DC power supply to add the supply power mode of storage battery, and old transformer station's major part is single group or two groups of controllable silicon phase control rectifier power source charges device list group storage battery modes; Have employed two groups of high frequency switch power charging devices and two groups of valve controlling sealed maintenance-free lead accumulator modes in 500kV, 220kV of putting into operation after 2003 and part 110kV transformer station, according to the difference using operating voltage, be divided into 110V direct current system and 220V direct current system; 35kV and 10kV transformer station newly-built in recent years mostly have employed single group high frequency switch power charging device list group storage battery mode.According to statistics, have employed the ratio about 70% of high frequency switch power at present, adopt the ratio of valve controlling sealed maintenance-free lead accumulator to reach 90%, common lead acid accumulator approximately only accounts for 10%, and storage battery actual average runs time limit 3-4.
At present, the DC power supply that electric power system uses major part adopts high frequency switch power, and phase-controlled power also has part in use as the product that is eliminated.Ripple, the high order harmonic component interference of phase-controlled power are comparatively large, and efficiency is low and bulky, supervisory control system imperfection, is difficult to the requirement meeting comprehensive automation and unattended operation transformer station or power plant.High frequency switch power has voltage stabilizing, precision of steady current is high, volume is little, lightweight, efficiency is high, output ripple and harmonic distortion little, from changing degree advantages of higher, thus progressively replace phase-controlled power, become the main body of electric operation power, and towards the future development of high frequency small, high efficiency, high reliability.The fast development of computer control, compunication and computer networking technology, for the development and improvement of electric operation power supervisory control system provides external condition, makes it develop and progressively realizes few man on duty, until unattended operation.
Now there is multiple battery detecting instrument both at home and abroad, as external product has Japanese HIOKI, the U.S. MICRO CELLTRON, BTECH Products, they are the qualities judging battery by detecting the internal resistance of battery or conductance, but the single quality that accurately cannot be judged battery by the internal resistance of cell or conductance, because the internal resistance of battery and conductance are very large with the charging and discharging state of battery, the size of discharge current value, battery context variations in temperature, sometimes not more than an order of magnitude.Simultaneously the order of magnitude of internal resistance of cell value is m Ω level, also accurately cannot measure, therefore determine quantifier elimination internal resistance to judge that the quality of battery has certain drawback separately, while it is by manual measurement to the detection of battery, do not possess real-time and linearly.The battery on-line detecting system of existing domestic existing part company exploitation be the detection being completed battery by VOLT detection method, and independent VOLT detection method cannot solve the series of problems such as the accumulative electric charge of fail battery.
At present, generally believe in power supply theoretical circles: the best approach of verification battery capacity is only had and discharged by the full capacity of battery.Theoretical according to this, part company have developed capacity tester, battery discharging monitor, this kind of Product checking precision is higher, discharge examination can be carried out to whole Battery pack, but do not possess linearly, battery pack, when carrying out battery capacity test, must be separated with power supply, slacken the standby integrity of battery pack by this series products.
U.S. BMS(Battery Monitoring System) Monitored System of Industrial Storage Cell technical development is in electric power applicable industry.1989, American Electric Power research institute cooperated with national electric energy research company, joint research unattended operation station PBWC lead acid accumulator comprehensive on-line condition monitoring system.Through the research and development of 4 years, cost 2,000,000 dollars, completed the field test of model machine in 1994.The parameter measured comprises: battery voltage, monomer voltage, (floating charge) maintain electric current, internal temperature of battery, battery pack ambient temperature, electrolyte density, liquid level of electrolyte height and electrode utilization power etc.Its method adopts the multisensor battery detection module (crying " battery monitor ", is vacuum-packed) be arranged on each battery.This module by optical cable by status data transfers to batteries monitor, each battery pack monitor can monitor 256 monocells.Remote control center is monitored battery pack monitor by MODEMS and pay station line, and the quantity of the battery pack monitor that can monitor is unrestricted.Control centre's PC regularly can inquire about the monitor of all operation groups, downloads and processes the data stored, storing and show the information of battery status and trend thereof, can obtain the parameter of each batteries.Its principal character uses each battery of particular sensor to battery pack to carry out independent monitoring.The measurement of single battery voltage uses a traditional direct A/D transducer with voltage stabilizing.The measurement of battery voltage is with a slide rheostat be connected with battery pack and the A/D transducer (by battery-powered) with voltage stabilizing reference.The measurement Hall effect magnetic domain transducer of battery pack current is measured.The measurement of internal temperature of battery is normally measured with the solid-state integrated circuit temperature sensor directly contacted with cell wall, and with the thermal effect isolation of external environment condition as air-flow and sunlight.The measurement of battery pack temperature is measured with same device.In order to describe the mean temperature of battery pack air, transducer is generally positioned on battery pack support.This achievement in research is applied to the fields such as power plant, transformer station, communication, motor vehicle and medical treatment.
Abroad someone studies VMS(VRLA Battery Management System) valve-control sealed lead acid battery management system.This management system is not simply monitor storage battery, but is designed to the function with management and control storage battery.The object of this system is the method changing storage battery " constant voltage charge ".Because the method for constant voltage charge can not meet the different charging currents needed for different batteries.The content of system monitoring comprises: measure assembled battery total voltage in single battery voltage, internal temperature of battery, discharging current and discharge process.BMS is contained in VMS.It is analyzed storage battery on the basis of monitoring, line pipe of going forward side by side reason and control.So more be conducive to the maintenance to storage battery, increasing storage battery service life.
But VMS and BMS cost is higher, and be not by the long-range discharge and recharge examined for the purpose of capacity, recovery capacity, and the transformer station be not suitable for now use.
Summary of the invention
The object of the application is to propose one can on-line monitoring batteries, and can long-range remote and intelligent maintenance system of batteries being carried out to the transforming plant DC power supply of charge and discharge operation.
The object of the application is achieved in that the remote and intelligent maintenance system of transforming plant DC power supply comprises DC power supply, described DC supply input is connected with AC distribution end, DC power output end is connected with DC distribution end, described DC power supply comprises fills, discharge module 1-n, fill, discharge module 1-n is connected with batteries 1-n respectively, battery cell monitoring module 1-n is met after batteries 1-n, described battery cell monitoring module comprises voltage monitoring module, circuit monitoring module and inner walkway module, monitoring module is connect after described battery cell monitoring module, monitoring module is networked by modulator-demodulator and common exchanging telephone network PSTN, and be connected with control terminal.
Owing to implementing technique scheme, control terminal carries out telecommunication by the centralized monitor module of special line or public phone network and each tributary station direct current system.After the monitoring module of each tributary station direct current system receives the monitor command that control terminal assigns, data acquisition and the control operation to direct current system, and by result loopback remote control terminal, thus realize unattended operation and in real time centralized monitor and the remote maintenance of DC equipment.
The application installs detection and control terminal in transformer station, can automatically activate online batteries, balanced online, and according to the Mathematical Modeling set up, the capacity of storage battery, state are assessed, analyze and diagnosed, the characterisitic parameter of automatic calculating charging module, comprises the capacity of battery, internal resistance, cell voltage, charging and discharging currents.
Accompanying drawing illustrates: the concrete structure of the application is provided by following drawings and Examples:
Fig. 1 is the remote and intelligent maintenance system schematic of transforming plant DC power supply;
Fig. 2 is charge-discharge modules control principle drawing;
Fig. 3 is monitoring module schematic diagram;
Fig. 4 is storage battery online single-unit electric discharge equivalent circuit diagram;
Fig. 5 is battery cell discharge current value equivalent circuit diagram;
Fig. 6 is single battery internal resistance equivalent circuit diagram.
Embodiment: the application by the restriction of following embodiment, can not determine concrete execution mode according to the technical scheme of the application and actual conditions.
Embodiment: as shown in Figure 1, the remote and intelligent maintenance system of transforming plant DC power supply comprises DC power supply, described DC supply input is connected with AC distribution end, DC power output end is connected with DC distribution end, described DC power supply comprises fills, discharge module 1-n, fill, discharge module 1-n is connected with batteries 1-n respectively, battery cell monitoring module 1-n is met after batteries 1-n, described battery cell monitoring module comprises voltage monitoring module, circuit monitoring module and inner walkway module, monitoring module is connect after described battery cell monitoring module, monitoring module is networked by modulator-demodulator and common exchanging telephone network PSTN, and be connected with control terminal.
Batteries part, its function mainly can provide the direct current supply required for secondary circuit in real time when AC power power-off.
Charging module part, it is AC rectification that its function mainly contains two: one, converts galvanic current source to by AC power; Two is voltage stabilizing rectifications, namely in time charges a battery, to guarantee that storage battery is in the state can powered at any time.
Monitoring module part, the physical quantity that its primary responsibility monitoring interchange and batteries state etc. are numerous, and control charging module part intelligence battery is charged.The quality of monitoring module performance often determines the quality of DC power system performance, is the most deciding factor determining DC power system average price.
Voltage reduction module: the rated output voltage of electric operation power is typically chosen in 110V or 220V, if consider the needs that storage battery bulk charge runs, the most Gao Zeke of output voltage reaches 145% of rated output voltage, therefore output voltage (the 220V system of electric operation power, maximum output voltage can reach 330V), again because the terminal voltage excursion of storage battery is very large, so in electric power system, except the output (closing bus bar) that the impact loads such as combined floodgate are directly connected on storage battery, protection is closed the load of control class and is all indirectly connected (the output bus of regulator is called as control bus) with storage battery by voltage reduction module, to obtain more stable operating voltage.
Traditional regulator is silicon chain, and its principle seals in silicon stack on closing bus bar, utilizes silicon stack pressure drop to reduce output voltage.This pressure regulation method is simple, reliable, but has output voltage can not regulate (minimum resolution of regulation voltage is the pressure drop of a joint silicon stack) and inefficient shortcoming continuously.Switch power technology is increasingly mature, and voltage regulating module generally realizes with DC/DC converter now.
Described AC distribution end is connected by DC bus with between DC distribution end, and described DC bus comprises closing bus bar and control bus, between closing bus bar and control bus, be provided with dropping equipment, and described dropping equipment is the device falling voltage.
As shown in Figure 2, Battery charge controller system is made up of Single Chip Microcomputer (SCM) system and computer system two parts, wherein Single Chip Microcomputer (SCM) system to the circuit parameter in battery charging loop as electric current, voltage etc. gather, show and control, to realize the field control to charge in batteries loop; Computer system by the monitoring software of design, the parameter such as charging voltage, electric current of setting storage battery, and by communication that the bus of RS485 standard is carried out with on-the-spot Single Chip Microcomputer (SCM) system.When Single Chip Microcomputer (SCM) system obtains the order and parameter information of being sent by computer system, Single Chip Microcomputer (SCM) system completes the control to battery charging loop, realizes system remote monitoring.
As shown in Figure 3, monitoring module comprises single-chip microcomputer, and single-chip microcomputer is connected with A/D modular converter, the variable connector that is linked in sequence after A/D modular converter, Signal-regulated kinase, photoelectric isolation module and analog signal input module.Single-chip microcomputer is provided with RS485 interface, and is connected with keyboard and display unit.Monitoring module hardware take single-chip microcomputer as core, mainly completes the acquisition and processing of various data, the realization of computational algorithm, setting value management, real-time clock control, panel man-machine interface, serial-parallel interface control, On-off signal and control management and the controlling functions such as electronic switch.
When AC distribution end has electric time, three-phase electricity exports direct current through charging module and directly supplies user's use.Meanwhile, the battery cell discharge current value of battery cell monitoring module monitors battery, battery cell terminal voltage and retained storage capacity, and battery is charged according to the battery charging curve corresponding to it according to battery capacity, thus ensure that for subsequent use of battery completely holds state.Once interchange dead electricity, batteries discharge loop is open, and back-up source effect of DC power system can come into operation at once, to customer power supply, thus avoids the destruction because AC dump brings to user, decreases loss.
The remote and intelligent maintenance systematic difference of transforming plant DC power supply:
1, storage battery on-line monitoring: consider that battery pack is under floating charge state, constant load is utilized to discharge in short-term in turn to every batteries, gather electric current, magnitude of voltage by program computation discharging current, the internal resistance of cell, the online terminal voltage of battery cell, battery retained storage capacity, battery-active degree, carry out judgement battery quality.
As shown in Figure 4, the foundation of Mathematical Modeling: according to the equivalent circuit diagram of batteries, can set up the equivalent electric circuit of storage battery single-unit electric discharge, wherein: U to A
t: the summation of the electromotive force of batteries; R
t: the summation of storage battery internal resistance; U
i: the electromotive force of discharge battery; R
i: the resistance of discharge battery; R: the resistance of discharge load.Calculate the U of cell
i, R
i, I
iqualitative, quantitative comprehensive analysis is carried out to it.
B as shown in Figure 5, the calculating of battery cell discharge current value: float charger in Fig. 4 and other each batteries Thevenin's theorems are carried out equivalence, Us: the summation of the electromotive force of floating charge source and other batteries; Rs: the summation of other batteries internal resistance; U
2: the electromotive force of discharge battery; R
2: the resistance of discharge battery; R: the resistance of discharge load.By placing two current Hall elements in circuit, directly measure I
1, I
3numerical value.According to Kirchhoff's current law (KCL), I
2=I
3-I
1, can I be calculated
2value.I
2value is exactly the discharge current value of battery cell.
C as shown in Figure 6, the calculating of single battery internal resistance in on-line monitoring: by discharge load R is switched to R
', by can be calculated single battery: R=(U '
cD-U
cD)/(I
2-I '
2)
2, as shown in Figure 2, accumulator cell charging and discharging: first adopt constant current charge to predetermined magnitude of voltage, switch to constant voltage charge afterwards, Battery charge controller system is made up of Single Chip Microcomputer (SCM) system and computer system two parts, wherein Single Chip Microcomputer (SCM) system to the circuit parameter in charge in batteries loop as electric current, voltage etc. gather, show and control, to realize the field control to charge in batteries loop; Computer system is by the monitoring software of design, the parameter such as charging voltage, electric current of setting storage battery, and by communication that the bus of RS485 standard is carried out with on-the-spot Single Chip Microcomputer (SCM) system, when Single Chip Microcomputer (SCM) system obtains the order and parameter information of being sent by computer, Single Chip Microcomputer (SCM) system completes the control to charge in batteries loop, realizes system remote monitoring.
3, DC power supply monitoring modular: deliver to control terminal in the information of the DC equipment of each transformer station, for its inquiry, each control terminal also can send control command to each alternating current station simultaneously, is performed by monitoring module.The abnormal state of all right Timeliness coverage equipment operation, processes in time simultaneously.Use manpower and material resources sparingly fully, increase work efficiency.
DC power system supervisory control system mainly can be divided into three parts: the Insulation monitoring unit of DC loop, hand over straight parameter monitoring unit, battery inspection unit.
A insulating monitoring unit: the insulation level of DC power supply directly affects the reliability of DC loop.The failure rate of DC earthing comes the first place of electric fault rate always, and it brings potential danger to the safe operation of electric equipment.What the detection method of current employing can be divided into direct current sensing detection and additional AC signal according to the transducer utilized exchanges sensing detection.The problem that direct current sensing detection mainly runs into is that its cost is high, fragile, serious interference.Exchange the impact of sensing detection mainly by distributed capacitance very large, and must certain signal be injected, certain impact is produced on DC power system;
B parameter monitoring unit: parameter monitoring unit mainly detects busbar voltage and electric current, the research pressure of the electric converting station electric power operation one stream power-supply system of charger AC voltage and DC side and electric current, batteries charging/discharging voltage and electric current etc.And by this tittle with report to the police or action the comparing of standard volume of setting.Monitored by electromagnetic meter and relay;
C storage battery battery routing inspection unit: DC control supply system monitoring protective device, also becomes micro computer monitoring type from original voltage relay pattern, and realizes four remote control function.The insulating monitor of DC control supply system, before the eighties, it is the insulating monitor formed with electric bridge ~ mono-switching principle adopting soviet design always, by formations such as relay, voltmeter and diverter switches, have find earth fault, measuring system over the ground with pole insulation against ground resistance and the function determining earth electrode.After the eighties, on this basis, manufacture the device formed with integrated circuit, improve sensitivity, and busbar voltage monitoring arrangement is combined with each other with it, provide the comprehensive of device.But after DC control supply system generation earth fault, which pole ground connection above-mentioned insulating monitor can only determine, and can not determine it is which loop ground connection, searches earth point pretty troublesome in operation maintenance.For this situation, existing domesticly started incorporating selectively ground connection supervisory device, current this selectivity ground connection supervisory device also has two types, and one is to system Injection Signal mode, and another kind is the mode adopting highly sensitive direct current transducer.Use this device, can determine earth point occurs in which bar feeder assembly.
Above technical characteristic constitutes the most preferred embodiment of the application, and it has stronger adaptability and best implementation result, can increase and decrease inessential technical characteristic according to actual needs, meet the needs of different situations.
Claims (6)
1. the remote and intelligent maintenance system of a transforming plant DC power supply, it is characterized in that: it comprises DC power supply, described DC supply input is connected with AC distribution end, DC power output end is connected with DC distribution end, described DC power supply comprises fills, discharge module 1-n, fill, discharge module 1-n is connected with batteries 1-n respectively, battery cell monitoring module 1-n is met after batteries 1-n, described battery cell monitoring module comprises voltage monitoring module, circuit monitoring module and inner walkway module, monitoring module is connect after described battery cell monitoring module, monitoring module is networked by modulator-demodulator and PSTN, and be connected with control terminal.
2. the remote and intelligent maintenance system of transforming plant DC power supply as claimed in claim 1, it is characterized in that: described AC distribution end is connected by DC bus with between DC distribution end, described DC bus comprises closing bus bar and control bus, between closing bus bar and control bus, be provided with dropping equipment.
3. the remote and intelligent maintenance system of transforming plant DC power supply as claimed in claim 1, it is characterized in that: Battery charge controller system is made up of Single Chip Microcomputer (SCM) system and computer system two parts, wherein Single Chip Microcomputer (SCM) system to the circuit parameter in battery charging loop as electric current, voltage etc. gather, show and control, to realize the field control to charge in batteries loop; Computer system by the monitoring software of design, the parameter such as charging voltage, electric current of setting storage battery, and by communication that the bus of RS485 standard is carried out with on-the-spot Single Chip Microcomputer (SCM) system.
4. the remote and intelligent maintenance system of transforming plant DC power supply as claimed in claim 1, it is characterized in that: monitoring module comprises single-chip microcomputer, single-chip microcomputer is connected with A/D modular converter, the variable connector that is linked in sequence after A/D modular converter, Signal-regulated kinase, photoelectric isolation module and analog signal input module.
5. a remote and intelligent maintenance systematic difference for transforming plant DC power supply, is characterized in that: it comprises storage battery on-line monitoring, accumulator cell charging and discharging controls, DC power supply on-line monitoring:
(1) storage battery on-line monitoring: batteries is under floating charge state, constant load is utilized to discharge in short-term in turn to every batteries, gather electric current, magnitude of voltage by program computation discharging current, the internal resistance of cell, the online terminal voltage of battery cell, battery retained storage capacity, battery-active degree, carry out judgement batteries quality:
The foundation of A Mathematical Modeling: according to the equivalent circuit diagram of batteries, can set up the equivalent electric circuit of storage battery single-unit electric discharge, calculate the U of cell
i, R
i, I
iqualitative, quantitative comprehensive analysis is carried out to it;
The calculating of B battery monomer discharge current value: float charger and other each batteries Thevenin's theorems being carried out equivalence, by placing two current Hall elements in circuit, directly measuring I
1, I
3numerical value, according to Kirchhoff's current law (KCL), I
2=I
3-I
1, can I be calculated
2value, I
2value is exactly the discharge current value of battery cell;
The calculating of single battery internal resistance in C on-line monitoring: by discharge load R is switched to R
', by can be calculated single battery: R=(U '
cD-U
cD)/(I
2-I '
2)
(2) accumulator cell charging and discharging: first adopt constant current charge to predetermined magnitude of voltage, switch to constant voltage charge afterwards, when Single Chip Microcomputer (SCM) system obtains the order and parameter information of being sent by computer, Single Chip Microcomputer (SCM) system completes the control to charge in batteries loop, realizes system remote monitoring;
(3) DC power supply on-line monitoring: deliver to control terminal in the information of the DC equipment of each transformer station, for its inquiry, each control terminal also can send control command to each alternating current station simultaneously, is performed by monitoring module.
6. the remote and intelligent maintenance systematic difference of transforming plant DC power supply as claimed in claim 5, is characterized in that: DC power supply on-line monitoring is three parts: the Insulation monitoring unit of DC loop, hand over straight parameter monitoring unit, battery inspection unit:
(1) insulating monitoring unit: what utilize direct current sensing detection and additional AC signal exchanges sensing detection;
(2) parameter monitoring unit: parameter monitoring unit mainly detects busbar voltage and electric current, the research pressure of the electric converting station electric power operation one stream power-supply system of charger AC voltage and DC side and electric current, batteries charging/discharging voltage and electric current, and by this tittle with report to the police or action the comparing of standard volume of setting, monitored by electromagnetic meter and relay;
(3) storage battery battery routing inspection unit: adopt to system Injection Signal mode, or adopt the mode of highly sensitive direct current transducer.
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| CN107884722A (en) * | 2017-11-29 | 2018-04-06 | 福州福光电子有限公司 | A kind of distribution on line formula batteries monitoring device |
| CN108199477A (en) * | 2017-12-14 | 2018-06-22 | 国网河南省电力公司郑州供电公司 | Substation's ac and dc systems fault remote intelligent control method and equipment |
| CN109507932A (en) * | 2018-12-18 | 2019-03-22 | 镇江中煤电子有限公司 | Mine data switch remote monitoring device and monitoring method |
| CN109599938A (en) * | 2018-11-08 | 2019-04-09 | 国网四川省电力公司成都供电公司 | A kind of direct current cabinet battery group management and maintenance system |
| CN110098608A (en) * | 2019-03-12 | 2019-08-06 | 国网山西省电力公司晋中供电公司 | Transforming plant distributed DC power system |
| CN112072664A (en) * | 2019-06-10 | 2020-12-11 | 中国移动通信集团设计院有限公司 | Multi-input multi-output power supply device and integrated cabinet |
| CN112421769A (en) * | 2020-10-13 | 2021-02-26 | 国家电网有限公司 | Intelligent remote monitoring system for communication power supply equipment |
| CN112436580A (en) * | 2020-12-14 | 2021-03-02 | 国网北京市电力公司 | Suitcase type portable energy storage device and charging method thereof |
| CN112881934A (en) * | 2021-01-11 | 2021-06-01 | 合肥开关厂有限公司 | DC power supply on-line monitoring system |
| CN112910040A (en) * | 2021-01-28 | 2021-06-04 | 国网山东省电力公司龙口市供电公司 | Transformer substation storage battery electric quantity monitoring device |
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| CN113495220A (en) * | 2021-08-18 | 2021-10-12 | 广东电网有限责任公司东莞供电局 | Storage battery testing device and testing method |
| CN114069770A (en) * | 2021-10-22 | 2022-02-18 | 南方电网数字电网研究院有限公司 | Storage battery remote nuclear capacity control system and method |
| CN115208033A (en) * | 2022-09-14 | 2022-10-18 | 江苏楚能工程技术有限公司 | Intelligent integrated power supply system |
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