CN104635167A - Online monitoring system and online monitoring method for substation storage batteries - Google Patents
Online monitoring system and online monitoring method for substation storage batteries Download PDFInfo
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Abstract
The invention discloses an online monitoring system for substation storage batteries. The online monitoring system is characterized by consisting of a master control module, a node module and sensors; the master control module comprises an NXP LPC1700 microcontroller, a status indicator lamp, a communication interface, a signal analogue-to-digital/digital-to-analogue conversion module, a battery pack total voltage sensor, a battery pack total current sensor and a power supply. As a master-slave separated network structure is adopted by the online monitoring system disclosed by the invention, the storage batteries of which the number is not greater than 120 can be integrally and singly by one main module respectively; as an RJ45/IEEE802.3 communication interface communicates with a computer of a management center, compared with the traditional communication interface, the RJ45/IEEE802.3 communication interface has the advantages that the transmission is more reliable, the speed is high and the like; the node module capable of temporarily storing status data of a single battery is provided with an on-chip flash, and when the master control module needs to access to the data, the data can be read directly through the flash, and therefore the time of data interaction is prolonged, the reliability of a whole standby power supply system can be enhanced favorably, the operation and maintenance cost is reduced, and the work efficiency is increased.
Description
Technical field
The present invention is directed to various fault that storage batteries of transformer substation in use occurs and the problem such as greatly to shorten serviceable life, describe the on-line monitoring scheme of a kind of battery pack and single battery, the program follows principal and subordinate's modular designs, wherein main control module is responsible for monitoring battery pack state, the status poll of cell performs with order, communicates with host computer, and use I2C universal serial bus to carry out link management to each cell measuring unit.
Background technology
Storage batteries of transformer substation group as protection, control, the back-up source of signal and communicator; its stability, durability and health status are very crucial; the detection of current battery pack still uses the mode of manual inspection; very easily human factor mistake occurs, therefore a kind of quick, accurate, reliable, safe accumulator on-line monitoring technique is particularly important.
Along with the fast development of microprocessor and the universal of network service, information can be sent to background monitoring center by network by the state of the real-time acquisition battery pack of monitoring modular and cell by battery pack monitoring technology, corresponding operation maintenance personnel can obtain the status information of battery pack timely, and make maintenance plan thus contribute to improving the reliability of whole backup power system, reduce O&M cost, increase work efficiency.
Summary of the invention
Goal of the invention: the invention provides a kind of storage batteries of transformer substation on-line monitoring system and method for solving the problem, is mainly used in the real time on-line monitoring of the various states parameter to battery pack and single battery.
Technical scheme:
A kind of storage batteries of transformer substation on-line monitoring system, it is characterized in that: described monitoring system is made up of main control module, node module and sensor, described main control module comprises NXP LPC1700 microcontroller, status indicator lamp, communication interface, signal modulus--D/A converter module, assembled battery total voltage sensor, electric battery total current sensor and power supply, wherein the CPU of NXP LPC1700 microcontroller adopts Cortex M3 processor, described node module comprises flash memory device on microprocessor, sheet, I2C bus, I2C resource allocator, I2C interface communication, battery cell current measurement circuit, battery cell tension measuring circuit, battery cell internal resistance measurement circuit, battery cell temperature sensing unit, and wherein the microprocessor of node module adopts LPC 1100Cortex M0, described detection system connected mode is: battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor is connected with a single data line synchro by a single data transmission line with main control module, information is delivered to I2C resource allocator by I2C bus by the serial node be arranged on above battery pack by node module simultaneously, I2C resource allocator and main control module are by I2C interface communication, main control module is by RJ45 communication interface, based on IEEE802.3 agreement, be connected with the computing machine of administrative center.
Described main control module also comprises the built-in RS232 interface be connected with commissioning device.
The serial node be made up of battery cell tension measuring circuit, battery cell internal resistance measurement circuit, battery cell temperature sensing unit is set in described node module, quantity≤128 of serial node.
Described communication interface adopts RJ45 interface, and communication protocol adopts IEEE802.3 to communicate with the computing machine of administrative center.
Described node module also comprises can flash memory device on the sheet of storage of collected data temporarily.
Described I2C bus connection node module is completely isolated on electrically.
A monitoring method for storage batteries of transformer substation on-line monitoring system as above, is characterized in that: described monitoring method can be divided into following a few step:
Step one:
The monitoring of total voltage, electric current: battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor are connected with a single data line synchro by a single data transmission line with main control module, ensure security and the synchronism of whole system whereby;
Step 2:
The wheel of monomer voltage, electric current, internal resistance, temperature is surveyed: the electric current of each accumulator collected respectively, voltage, temperature, internal resistance information are delivered to I2C resource allocator by I2C bus by the serial node be arranged on above battery pack by node module, for guaranteeing data security, data can be stored in flash memory device on the built-in sheet of divider in advance, wherein serial node≤120, then pass through I2C interface communication by I2C resource allocator and main control module; Wherein the measuring method of internal resistance is ac-current inject method, accumulator is injected to the ac signal of a low frequency, and low-frequency current can guarantee the performance of accumulator, and measures the low-frequency ac voltage V between accumulator anode and cathode simultaneously
0with the low-frequency ac electric current I flow through
sand the phase differential α between electric current and voltage, and by impedance computation formula, utilize V
0and I
sradiometer calculate impedance Z:
Accumulator internal resistance R calculates by impedance and phasometer:
R＝Zcosα。
Step 3:
Data are transmitted and system buildup: the data that step one and step 2 are collected by main control module by RJ45 communication interface, based on IEEE802.3 agreement, by data upload to the computing machine of administrative center; And then composition one both can implement overall monitoring, the accumulator on-line monitoring system of taking turns the remote distributed surveyed can be carried out to each target to be measured again.
Advantageous effect:
The invention has the advantages that the network structure that the present invention adopts principal and subordinate to separate, primary module can distinguish the battery pack of overall, monomer monitoring quantity≤120; Communicate with the computing machine of administrative center owing to have employed RJ45/IEEE802.3 communication interface, comparatively traditional communication, possesses transmission more reliable, the more high advantage of speed; The node module that temporarily can store the status data of cell is possessed flash on sheet and, when main control module needs visit data, can directly be read by flash, improves the time of interaction data; Use 2 order wires between main control module and battery pack, a transmission of data signals, synchronous for clock, to guarantee security and the synchronism of whole system.
Accompanying drawing illustrates:
Fig. 1 is accumulator on-line monitoring protocol population frame diagram of the present invention;
Fig. 2 is system layer of the present invention and interface classification schematic diagram;
Fig. 3 is main control module block schematic illustration of the present invention;
Fig. 4 is node module block schematic illustration of the present invention;
Fig. 5 is improvement internal resistance model schematic of the present invention.
Embodiment:
Accumulator on-line monitoring scheme gathers real-time voltage, charging and discharging currents, internal resistance, temperature, battery capacity result is submitted to host computer and data center automatically by the acquisition module of main control module, each node, realizes the on-line monitoring of storage batteries of transformer substation state.The application program just can monitor the degradation of accumulator in time in day-to-day operation process, finds lagging batteries monomer, takes corresponding measure, ensure the safety of straight-flow system, stable operation according to battery pack overall operation situation and backward amount of monomer.
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
The present invention is mainly used in the on-line monitoring to battery pack and single battery.It can complete the Real-Time Monitoring to cell batteries and battery pack various states parameter.This programme is made up of main control module, node module and sensor.Main control module is used for the total voltage of on-line monitoring battery pack, total current and environment temperature; Serial nodal test module using I2C bus as distributing the electrical isolation bus of multiple cell batteries, because I2C bus addressing ability reaches 8Bit, namely 2
8=128, can maximum connection 128 cell batteries, because battery pack integral battery door quantity is little equal 120, therefore use I2C bus to be best selection of technical scheme as addressing and Bus isolation.The monomer voltage of each each accumulator of node module on-line monitoring, monomer electric current and monomer internal resistance.This programme additionally provides the RJ45 communication interface of standard, based on IEEE802.3 agreement, forms the accumulator on-line monitoring system of a remote distributed together with the computing machine of administrative center.This monitoring system is to ensureing that the safe operation of user's backup batteries serves very important effect.
Battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor is connected with a single data line synchro by a single data transmission line with main control module, ensure security and the synchronism of whole system whereby, simultaneously the electric current of each accumulator that will collect respectively by being arranged on serial node above battery pack of node module, voltage, temperature, internal resistance information is delivered to I2C resource allocator by I2C bus, wherein serial node≤120, main control module and I2C resource allocator are by I2C interface communication, last main control module is by RJ45 communication interface, based on IEEE802.3 agreement, by real for the data computing machine being uploaded to administrative center, form one together and both can implement overall monitoring, again can to the accumulator on-line monitoring system of the remote distributed that each target to be measured is monitored respectively.
Fig. 1 is accumulator on-line monitoring protocol population frame diagram of the present invention, Fig. 2 is system layer of the present invention and interface classification schematic diagram, as shown in the figure, this monitoring system connected mode is: battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor is connected with a single data line synchro by a single data transmission line with main control module, information is delivered to I2C resource allocator by I2C bus by the serial node be arranged on above battery pack by node module simultaneously, I2C resource allocator and main control module are by I2C interface communication, main control module is by RJ45 communication interface, based on IEEE802.3 agreement, by real for the data computing machine being uploaded to administrative center.
Fig. 3 is main control module frame diagram of the present invention, as shown in the figure, this accumulator on-line monitoring scheme main control module comprises NXP LPC1700 microcontroller, status indicator lamp, communication interface, signal modulus--D/A converter module, assembled battery total voltage sensor, electric battery total current sensor, further comprises the built-in RS232 interface be connected with commissioning device, wherein LPC1700 is 120MHZ CPU, inter-process ability is strong, low in energy consumption, Peripheral Interface enriches, the inner current signal sensor output converts voltage signal to, enter 12 AD of LPC1700 inside, complete Analog-digital Converter.Realized and the data of host computer, the mutual of control command by built-in MAC layer and PHY layer.By built-in RS232 interface
[4]be connected with commissioning device, when system runs into fault, undertaken debugging, locating by this interface.Main control module and node module are by I2C interface communication, possesses the function of addressing, transceiving data, after node module completes the measurement of voltage to cell, temperature and internal resistance, main control module can carry out poll to whole node module and read and also can extract data separately to 1 ~ 128 node module and save the data in the data buffer of main control module in order to host computer inquiry.Use I2C interface connected node module, this communication port and node module are completely isolated on electrically, to guarantee the safety of battery pack, and possess Time BUS, can carry out triggering more accurately and sample, make the accuracy of image data higher to data.
Fig. 4 is node module frame diagram of the present invention, as shown in the figure, the node module of accumulator on-line monitoring scheme comprises flash memory device on microprocessor, sheet, I2C bus, I2C resource allocator, I2C interface communication, battery cell current measurement circuit, battery cell tension measuring circuit, battery cell internal resistance measurement circuit, battery cell temperature sensing unit and communication extension circuit, and further comprises can flash memory device on the sheet of storage of collected data temporarily.Microprocessor adopts the LPC 1100Cortex M0 of NXP company, and it has the bus speed of 50MHZ, flash storage medium on the sheet supporting 32KB, can the data that arrive of storage of collected temporarily, has ensured the security of data.Serial peripheral support I2C bus at a high speed, can with main control module seamless connection.And embedded temperature sensor, the surface temperature of cell batteries is monitored in real time by AD conversion unit
[5].Battery cell tension measuring circuit is responsible for measuring the voltage signal of accumulator, battery cell internal resistance measurement circuit is responsible for the internal resistance signal measuring accumulator.
Fig. 5 is improvement internal resistance illustraton of model of the present invention, and as shown in the figure, the method measuring internal resistance comprises densimetry, open-circuit voltage method, direct-current discharge method and ac-current inject method.But first three plant measuring method have be not suitable for sealed lead acid storage battery internal resistance measurement, low precision, affect the undesirable elements such as the life of storage battery, ac-current inject method is adopted then not need to discharge to accumulator, to advantages such as the life-span of accumulator impact, therefore can not can use ac-current inject method on-line measurement accumulator internal resistance safely.When using ac-current inject method to measure, accumulator is injected to the ac signal of a low frequency, low-frequency current can guarantee the performance of accumulator, and measures the low-frequency ac voltage V between accumulator anode and cathode simultaneously
0with the low-frequency ac electric current I flow through
sand the phase differential α between electric current and voltage, and by impedance computation formula, utilize V
0and I
sradiometer calculate impedance Z:
The computing formula of accumulator internal resistance can calculate R=Zcos α by impedance and phasometer.It should be noted that because accumulator internal resistance is milliohm level, therefore once there is the error of components and parts or the irregular situation of sinusoidal waveform of test lead alternating voltage in test process, internal resistance value can change a lot, and causes the decline of measurement progress.Revise so need to add algorithm for error correction accurately.The correction of internal cell resistance is realized by increasing equivalent polarization resistance RC and equivalent polarization capacity C.
Wherein, R
cfor equivalent polarization resistance, R
0for cell resistance, C is polarization capacity.
Inject low-frequency test electric current x1 at the two ends of accumulator, and record storage battery pressure drop x2.
x
1＝cos(ωt)+n
1(t)
x
2＝cos(ωt+θ)+n
2(t)
Because white noise signal is 0 in the cycle of sinusoidal signal, therefore above formula can be reduced to:
2T-Tcosθ＝A
Wherein: θ is the phase differential of Injection Current and output voltage.
Because internal resistance detection needs an initial reference value as benchmark, therefore the record data when first measurement, as the investigation foundation of later testing result, judge accumulator health status.Owing to have employed the method for squelch, eliminate because the impact caused of fluctuating appears in components and parts and alternating voltage waveform, improve the precision of internal resistance detection significantly.
Feature of the present invention is as follows:
1, the network structure adopting principal and subordinate to separate, node module uses I2C universal serial bus to carry out addressing and isolation, facilitates monitoring and the management of main control end, due to the characteristic of I2C bus, can support at most that 128 joint single batteries carry out measuring and managing.And only need a primary module.
2, main control module have employed RJ45/IEEE802.3 communication interface and communicates with the computing machine of administrative center, compares the communication interface of traditional RS232/RS485, possesses transmission more reliable, the more high advantage of speed.
3, by the mode of I2C addressing, can by the state of the some cells of main control module random access, avoid old-fashioned universal serial bus to access the status information that must gather all batteries at every turn, problematic monomer can be located more accurately, reduce the cost of Replacement and Repair.
4, node module possesses flash on sheet, can store the status data of cell temporarily, if when main control module needs visit data, can directly be read by flash, improves the time of interaction data.
5, use 2 order wires between main control module and battery pack, a transmission of data signals, synchronous for clock, to guarantee security and the synchronism of whole system.
Claims (7)
1. a storage batteries of transformer substation on-line monitoring system, it is characterized in that: described monitoring system is made up of main control module, node module and sensor, described main control module comprises NXPLPC1700 microcontroller, status indicator lamp, communication interface, signal modulus--D/A converter module, assembled battery total voltage sensor, electric battery total current sensor and power supply, wherein the CPU of NXPLPC1700 microcontroller adopts Cortex M3 processor, described node module comprises flash memory device on microprocessor, sheet, I2C bus, I2C resource allocator, I2C interface communication, battery cell current measurement circuit, battery cell tension measuring circuit, battery cell internal resistance measurement circuit, battery cell temperature sensing unit, and wherein the microprocessor of node module adopts LPC 1100 Cortex M0, described detection system connected mode is: battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor is connected with a single data line synchro by a single data transmission line with main control module, information is delivered to I2C resource allocator by I2C bus by the serial node be arranged on above battery pack by node module simultaneously, I2C resource allocator and main control module are by I2C interface communication, main control module is by RJ45 communication interface, based on IEEE802.3 agreement, be connected with the computing machine of administrative center.
2. a kind of storage batteries of transformer substation on-line monitoring system according to claim 1, is characterized in that: described main control module also comprises the built-in RS232 interface be connected with commissioning device.
3. a kind of storage batteries of transformer substation on-line monitoring system according to claim 1, it is characterized in that: the serial node be made up of battery cell tension measuring circuit, battery cell internal resistance measurement circuit, battery cell temperature sensing unit is set in described node module, quantity≤128 of serial node.
4. a kind of storage batteries of transformer substation on-line monitoring system according to claim 1, is characterized in that: described communication interface adopts RJ45 interface, and communication protocol adopts IEEE802.3 to communicate with the computing machine of administrative center.
5. a kind of storage batteries of transformer substation on-line monitoring system according to claim 1, is characterized in that: described node module also comprises can flash memory device on the sheet of storage of collected data temporarily.
6. a kind of storage batteries of transformer substation on-line monitoring system according to claim 1, is characterized in that: described I2C bus connection node module is completely isolated on electrically.
7. a monitoring method for storage batteries of transformer substation on-line monitoring system as claimed in claim 1, is characterized in that: described monitoring method can be divided into following a few step:
Step one:
The monitoring of total voltage, electric current: battery pack to be measured is connected with electric battery total current sensor with assembled battery total voltage sensor, total voltage, total current sensor are connected with a single data line synchro by a single data transmission line with main control module, ensure security and the synchronism of whole system whereby;
Step 2:
The wheel of monomer voltage, electric current, internal resistance, temperature is surveyed: the electric current of each accumulator collected respectively, voltage, temperature, internal resistance information are delivered to I2C resource allocator by I2C bus by the serial node be arranged on above battery pack by node module, for guaranteeing data security, data can be stored in flash memory device on the built-in sheet of divider in advance, wherein serial node≤120, then pass through I2C interface communication by I2C resource allocator and main control module; Wherein the measuring method of internal resistance is ac-current inject method, accumulator is injected to the ac signal of a low frequency, and low-frequency current can guarantee the performance of accumulator, and measures the low-frequency ac voltage V between accumulator anode and cathode simultaneously
0with the low-frequency ac electric current I flow through
sand the phase differential α between electric current and voltage, and by impedance computation formula, utilize V
0and I
sradiometer calculate impedance Z:
Accumulator internal resistance R calculates by impedance and phasometer:
R＝Zcosα。
Step 3:
Data are transmitted and system buildup: the data that step one and step 2 are collected by main control module by RJ45 communication interface, based on IEEE802.3 agreement, by data upload to the computing machine of administrative center; And then composition one both can implement overall monitoring, the accumulator on-line monitoring system of taking turns the remote distributed surveyed can be carried out to each target to be measured again.
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