CN107390142B - Transformer substation direct-current power supply state monitoring system and power supply state monitoring method - Google Patents
Transformer substation direct-current power supply state monitoring system and power supply state monitoring method Download PDFInfo
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- CN107390142B CN107390142B CN201710823621.3A CN201710823621A CN107390142B CN 107390142 B CN107390142 B CN 107390142B CN 201710823621 A CN201710823621 A CN 201710823621A CN 107390142 B CN107390142 B CN 107390142B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A transformer substation direct current power supply state monitoring system and a power supply state monitoring method relate to a power supply state monitoring system and a power supply state monitoring method. In order to solve the problems that the existing direct current system detection of the transformer substation can only disconnect a storage battery from a system capacity check experiment when a certain service life is reached, the transportation is inconvenient, personnel on-site monitoring is needed, and the potential safety hazard problem is large. The system comprises a main controller, a mains supply detection circuit for detecting whether mains supply is lost, a discharging instrument-storage battery switching control circuit for carrying out discharging instrument and storage battery switching control according to the situation of the mains supply loss, a storage battery temperature acquisition circuit for detecting the working temperature of a storage battery, a charge equalization circuit for carrying out charge control on the storage battery and an internal resistance measurement module for detecting the internal resistance of the storage battery. The invention is suitable for monitoring the state of the direct current power supply of the transformer substation.
Description
Technical Field
The invention relates to a power supply state monitoring system and a method.
Background
The DC system plays a vital role in the transformer substation, and provides stable and reliable power supply for equipment such as signals, protection, automatic devices, accident lighting, circuit breakers and the like of the transformer substation, so that the performance and the stability of the DC system play an important role in the safe operation of the transformer substation. The direct current system is almost formed by a storage battery pack formed by combining tens of single storage batteries in series/parallel. The storage battery pack works in a charging state at ordinary times, and is charged by a charger for 24 hours. Under the condition that the commercial power is lost, the storage battery is immediately put into operation to provide power for all direct current equipment of the transformer substation. The reliability of the battery therefore plays a critical role in the dc system. The performance of the cell battery is important to the performance of the entire battery pack. However, in use, the detection of the storage battery is to detect the temperature and the single voltage, and the capacity and the internal resistance of the storage battery are not tested. When the internal resistance of a certain storage battery becomes large, the capacity is reduced, and the power supply safety is seriously endangered.
According to national regulations, the battery pack performs a capacity check experiment every 2 to 3 years, and the battery after 6 years of operation should perform a capacity check experiment every year. In the process of carrying out the capacity check experiment, the storage battery needs to be disconnected from the system and connected with the discharge instrument, and the transportation is inconvenient due to huge load. Meanwhile, if no personnel monitor the capacity generated in the discharging process on site, safety accidents can be caused, and the manual measurement of the voltage of the storage battery is dangerous. And if the commercial power is lost in the discharging process, the storage battery cannot be put into operation in time, and the transformer substation falls into paralysis at any time.
Disclosure of Invention
The invention aims to solve the problems that the existing direct current system detection of the transformer substation can only disconnect a storage battery from a system capacity check experiment when a certain service life is reached, the transportation is inconvenient, the personnel is required to monitor on site and the potential safety hazard is large.
The transformer substation direct-current power supply state monitoring system comprises a main controller, a commercial power detection circuit, a discharging instrument-storage battery pack switching control circuit, a storage battery temperature acquisition circuit, a plurality of charge equalization circuits and a plurality of internal resistance measurement modules;
the main controller U3 is a singlechip with the model of C8051F 500;
in the commercial power detection circuit, a commercial power N and a commercial power L are respectively connected with pins 4 and 5 of a coil winding of a Relay, and a pin 2 of the Relay is connected with a pin 32 of a main controller U3; when the mains supply is normal, the mains supply detection pin 2 and the GND pin 1 are disconnected, and the corresponding state is that the mains supply is normal; when the mains supply is lost, the mains supply detection pins 2 and gnd are conducted, and the corresponding state is that the mains supply is lost;
the discharging instrument-storage battery pack switching control circuit comprises a mains supply switching control K1, a storage battery switching control K2, a first double-switching Relay-DPDT, a second double-switching Relay-DPDT and a storage battery circuit;
the first double-throw double-switch Relay-DPDT control K1 and the second double-throw double-switch Relay-DPDT control K2 are respectively connected with a storage battery line or a commercial power through K1 in a selection way of 'transformer substation load+' and 'transformer substation load-'; the storage battery plus and the storage battery minus are respectively connected with a storage battery line or a discharging instrument through K2;
the two pins of the coil winding of the Relay-DPDT of the first double-throw double-switch Relay are respectively 'mains supply switching+' and 'mains supply switching-', the 'mains supply switching+' is connected to a power supply of the system, and the 'mains supply switching-' is connected with the 31 pins of the main controller U3;
the two pins of the coil winding of the Relay-DPDT of the second double-throw Relay are respectively 'storage battery throw-in+' and 'storage battery throw-out-', the storage battery switching plus is connected to a power supply of the system, and the storage battery switching plus is connected with 30 pins of the main controller U3;
in the charge equalization control circuits, each charge equalization control circuit corresponds to one storage battery, the charge equalization circuits are respectively marked as 'equalization 1' to 'equalization x', and each storage battery is respectively connected with 'BT 1' to 'BTx'; the Bat+ pin of each charge equalization control circuit is respectively connected with the positive electrode of the storage battery, the Bat+ pin of each charge equalization control circuit is respectively connected with the negative electrode of the storage battery, the Vcc+ pin of the equalization 1 is respectively connected with the charger+ "," equalization x "," Vcc- "is connected with the charger-", "Vcc-" of the equalization 1 to the equalization x-1 "is connected with the Vcc+", of the previous storage battery;
the storage battery temperature acquisition circuit comprises a plurality of 1-wire bus 18B20 chips, the plurality of 18B20 chips are directly connected in parallel, and each 18B20 chip corresponds to one storage battery temperature; the Vcc pin of each 18B20 chip is connected with the positive power supply, the Gnd pin corresponds to the negative power supply, and the Dq pin sends temperature data to the main controller U3 for real-time temperature acquisition of the storage battery;
in the internal resistance measurement modules, each internal resistance measurement module corresponds to one storage battery, res+ of the internal resistance measurement module is connected with the positive side of the storage battery, res-' of the internal resistance measurement module is connected with the negative side of the storage battery, and comA and comB data pins are respectively connected to pins 34 and 33 of the controller U3; each internal resistance measurement module outputs data through the comA and comB data pins, respectively.
Preferably, the substation direct-current power supply state monitoring system further comprises a storage battery voltage detection circuit, and the storage battery voltage detection circuit is connected with a No. 33 pin and a No. 34 pin of the main controller U3.
Preferably, the substation direct-current power supply state monitoring system further comprises a current transformer, the current transformer measures charging and discharging currents on a storage battery cable, and the output of the current transformer directly enters a No. 26 pin of the main controller U3.
Preferably, the system power supply of the main controller U3 is 3.3V, the system power supply is connected with the resistor R11 and the capacitor C4, the capacitor C4 is grounded, the resistor R11 is connected with the pin 2 and the pin 3 of the main controller U3, that is, the system power supply supplies power to the main controller U3 through the resistor R11 and the capacitor C4; the reference source adopts the internal reference of the main controller U3, the pin 8 of the main controller U3 is respectively connected with the tantalum capacitor C12 and the capacitor C11, and the tantalum capacitor C12 and the capacitor C11 are commonly connected to the GND end.
Preferably, the substation direct-current power supply state monitoring system further comprises a communication module, wherein the signal output end of the main controller U3 is connected with the signal input end of the communication module, and the signal input end of the main controller U3 is connected with the signal output end of the communication module; the main controller U3 sends the collected data to the monitoring center through a communication module, and simultaneously receives instruction information of the monitoring center through the communication module.
Preferably, the substation direct-current power supply state monitoring system further comprises a display module, wherein the signal output end of the main controller U3 is connected with the signal input end of the display module and is used for displaying state information of the storage battery and state information of the commercial power;
the state information of the storage battery comprises temperature data, current, voltage and internal resistance information of the storage battery;
the mains supply state information comprises information about whether mains supply is lost or not and information about switching states of the discharging instrument and the storage battery pack.
A method for monitoring power supply state by using a transformer substation direct current power supply state monitoring system is realized based on the transformer substation direct current power supply state monitoring system; the method comprises the following steps:
before the main controller U3 detects the state of the storage battery for the first time, initializing temperature data, voltage data, current data and internal resistance data of the storage battery;
the main controller U3 receives an instruction of the monitoring center for detecting the storage battery through a communication touch quickly, the main controller U3 firstly detects whether the commercial power corresponding to the transformer substation is lost through a commercial power detection circuit in real time, when the commercial power is lost, the main controller U3 controls a discharging instrument-storage battery pack switching control circuit to switch the load of the transformer substation onto a storage battery line, the storage battery is not detected, the storage battery is controlled to supply power to the transformer substation, if the storage battery is in discharge detection, the discharging is stopped immediately, the load of the transformer substation is switched onto the storage battery line, and the storage battery is controlled to supply power to the transformer substation;
when the mains supply is normal, the main controller U3 controls the discharge instrument-storage battery pack switching control circuit to control the mains supply to supply power to the transformer substation, and judges whether the discharge instrument meets discharge conditions or not;
when the discharging condition is met, the storage battery is controlled to be discharged through a discharging instrument, and temperature, voltage and charging and discharging current information of the storage battery are acquired through a storage battery temperature acquisition circuit, a storage battery voltage detection circuit and a current transformer respectively in the discharging process; meanwhile, judging whether the discharge instrument meets the discharge termination condition, if so, stopping discharging, and stopping the detection of the storage battery, otherwise, continuing to detect the storage battery;
when the discharging condition is not met, the charging of the storage batteries is controlled by the charge balance control circuit, and the charging capacity, the charging current and the charging voltage of each storage battery are monitored in the charging process; and the internal resistance of the storage battery is acquired through the internal resistance measuring module in the charging process.
The invention has the following beneficial effects:
the system can realize the on-line acquisition of the data of the temperature, voltage, current, internal resistance, mains supply state, charge and discharge conditions and the like of the substation control storage battery pack, and the data control of mains supply switching, storage battery pack switching and discharge instrument switching. When the commercial power function is lost, the system immediately controls the storage battery switching circuit to enable the storage battery to be in a working state, and normal working of the transformer substation is ensured. When the commercial power is normal, judging whether the discharge condition of the storage battery pack is reached, and starting to check the capacity of the storage battery pack. When the discharge condition is reached, discharge is started, data is always monitored in the discharge process, and whether the discharge termination condition is reached is monitored. The discharge is stopped immediately if the condition is satisfied. And when the discharging condition is not satisfied, the storage battery is charged in an equalizing way through the storage battery equalizing control circuit. Meanwhile, the system transmits all collected data and control state data to monitoring software of a monitoring center, the monitoring software compares and judges the performance of the storage battery through analysis, calculation and historical data, the performance and the state of the storage battery are analyzed, early warning is carried out in advance, and accidents are avoided.
Compared with the existing method for detecting the storage battery disconnecting system and the connection discharging instrument, the invention has the following advantages:
compared with the existing method for detecting the storage battery by disconnecting the system and connecting the discharging instrument, the method can reflect the state of the storage battery in time, accurately judge the abnormal storage battery, and does not influence the work of the storage battery and the direct current power supply system of the transformer substation. And the workload of operation and maintenance personnel can be greatly reduced, the dangers are reduced, the occurrence of related accidents is avoided, the normal work of the transformer substation is ensured, and the power supply safety is ensured.
Drawings
Fig. 1 is a schematic diagram of a main controller U3 of a substation dc power state monitoring system;
FIG. 2 is a schematic diagram of a mains supply detection circuit of a substation DC power state monitoring system;
FIG. 3 is a schematic diagram of a discharge meter-battery pack switching control circuit of a substation DC power state monitoring system;
fig. 4 is a charge equalization control circuit of the substation dc power state monitoring system;
FIG. 5 is a temperature acquisition circuit of the substation DC power supply status monitoring system;
FIG. 6 is an internal resistance measurement module circuit of the substation DC power supply status monitoring system;
FIG. 7 is a circuit diagram of a master controller reference source;
fig. 8 is a flowchart of power state monitoring using the substation dc power state monitoring system.
Detailed Description
The first embodiment is as follows:
the transformer substation direct-current power supply state monitoring system comprises a main controller, a commercial power detection circuit, a discharging instrument-storage battery pack switching control circuit, a storage battery temperature acquisition circuit, a plurality of charge equalization circuits and a plurality of internal resistance measurement modules;
as shown in fig. 1, the main controller U3 is a single chip microcomputer with model number C8051F500, and is internally provided with a 64K program memory, a 12-bit AD converter and an 8-path AD input interface; the C8051F500 chip is internally integrated with an AD converter and a DA converter, an internal crystal oscillator can reach 50MIPS, and the chip has the advantages of strong anti-interference capability, large program storage space and the like;
as shown in fig. 2, in the commercial power detection circuit, a commercial power N and a commercial power L are respectively connected with pins No. 4 and No. 5 of a coil winding of a Relay, and a pin No. 2 of the Relay is connected with a pin No. 32 (P2.2) of a main controller U3; when the mains supply is normal, the mains supply detection pin 2 and the GND pin 1 are disconnected, and the corresponding state is that the mains supply is normal; when the mains supply is lost, the mains supply detection pins 2 and gnd are conducted, and the corresponding state is that the mains supply is lost, so that the mains supply detection function is completed.
Kpower in FIG. 2 is the name of the relay in the drawing sheet.
As shown in fig. 3, the discharging instrument-storage battery pack switching control circuit comprises a mains supply switching control K1, a storage battery switching control K2, a first double-switching Relay-DPDT, a second double-switching Relay-DPDT and a storage battery circuit;
the first double-throw double-switch Relay-DPDT control K1 and the second double-throw double-switch Relay-DPDT control K2 are respectively connected with a storage battery line or a commercial power through K1 in a selection way of 'transformer substation load+' and 'transformer substation load-'; the storage battery plus and the storage battery minus are respectively connected with a storage battery line or a discharging instrument through K2;
the two pins of the coil winding of the Relay-DPDT of the first double-throw double-switch Relay are respectively 'mains supply switching+' and 'mains supply switching-', the 'mains supply switching+' is connected to a power supply of the system, and the 'mains supply switching-' is connected with the 31 pins of the main controller U3;
the two pins of the coil winding of the Relay-DPDT of the second double-throw Relay are respectively 'storage battery throw-in+' and 'storage battery throw-out-', the storage battery switching plus is connected to a power supply of the system, and the storage battery switching plus is connected with 30 pins of the main controller U3.
When the mains supply is normal, the 30 pins of the main controller U3 control K1 to be attracted through the first double-throw double-switch Relay-DPDT, and the mains supply supplies power to the transformer substation through the K1; when the storage battery is discharged through the discharging instrument, if the transformer substation loses commercial power, the 30 pins of the main controller U3 are controlled to K1 through a first double-switching Relay-DPDT, and the load of the transformer substation is switched to a storage battery line; at this time, the 31 feet of the main controller U3 are used for controlling K2 through the second double-switching Relay-DPDT, the storage battery is immediately switched to a storage battery line, the discharging operation of the discharging instrument on the storage battery is rapidly stopped, the storage battery supplies power for the transformer substation, and the situation that the transformer substation cannot supply power to the transformer substation because the storage battery is in a discharging state of the discharging instrument is avoided.
As shown in fig. 4, in the plurality of charge equalization control circuits, each charge equalization control circuit corresponds to one section of storage battery, the charge equalization circuits are respectively marked as "equalization 1" to "equalization x", and each section of storage battery is respectively connected with "BT1" to "BTx"; the Bat+ pin of each charge equalization control circuit is respectively connected with the positive electrode of the storage battery, the Bat+ pin of each charge equalization control circuit is respectively connected with the negative electrode of the storage battery, the Vcc+ pin of the equalization 1 is respectively connected with the charger+ "," equalization x "," Vcc- "is connected with the charger-", and the Vcc- "of the equalization 1 to the equalization x-1" are respectively connected with the Vcc+ "of the previous storage battery. The charge balance control circuit monitors the charge capacity, the charge current and the charge voltage of each storage battery in the storage battery charging process, and avoids the performance loss of the storage battery caused by overcharge and undercharge.
As shown in fig. 5, the storage battery temperature acquisition circuit comprises a plurality of 1-wire bus 18B20 chips, wherein the plurality of 18B20 chips are directly connected in parallel, and each 18B20 chip corresponds to one storage battery temperature; the Vcc pin of each 18B20 chip is connected with the positive power supply, the Gnd pin corresponds to the negative power supply, and the Dq pin sends temperature data to the main controller U3 for real-time temperature acquisition of the storage battery; the system is designed for multi-temperature acquisition; the 18B20 chip can directly change the ambient temperature into a digital signal to be output through the Dq pin, and each 18B20 has unique codes, so that the temperature acquisition requirements of a plurality of parallel acquisition positions are met. The single chip microcomputer and the 18B20 chips are in digital communication, the 18B20 chips work in real time, the single chip microcomputer queries each 18B20 chip in a rotating mode, the single chip microcomputer designates which 18B20 chip is in communication with in the rotating query, and the selected 18B20 chip sends the battery temperature data which are collected correspondingly to the single chip microcomputer.
As shown in fig. 6, in the plurality of internal resistance measurement modules, each internal resistance measurement module corresponds to a section of storage battery, the "res+" of the internal resistance measurement module is connected with the positive side of the storage battery, the "res-" of the internal resistance measurement module is connected with the negative side of the storage battery, and the comA and comB data pins are respectively connected to the pin 34 and the pin 33 of the controller U3; each internal resistance measurement module outputs data through the comA and comB data pins, respectively.
As shown in FIG. 4, the internal resistance measuring modules are internal resistance collecting modules of any type and are respectively marked as M1-Mx, each internal resistance collecting measuring module is connected to the storage batteries BT 1-BTx, each module outputs data through comA and comB data pins, and each module has a unique address, so that the internal resistances of a plurality of storage batteries can be collected simultaneously. The singlechip and the internal resistance measuring modules are in digital communication, the internal resistance measuring modules work in real time, the singlechip queries each internal resistance measuring module in a rotating way, the singlechip designates which internal resistance measuring module is in communication with in the rotating query, and the selected internal resistance measuring module sends the corresponding acquired internal resistance data of the battery to the singlechip.
The second embodiment is as follows:
the transformer substation direct-current power supply state monitoring system according to the embodiment further comprises a storage battery voltage detection circuit, and the storage battery voltage detection circuit is connected with a No. 33 pin (P2.1) and a No. 34 pin (P2.0) of the main controller U3.
Other structures and parameters are the same as in the first embodiment.
When the direct-current power supply state monitoring system of the transformer substation is provided with a storage battery voltage detection circuit and an internal resistance measurement module circuit, the internal resistance is measured, and meanwhile, the voltage can be measured. The measurement of internal resistance requires voltage and current, so that the internal resistance is obtained and the voltage is also obtained.
And a third specific embodiment:
the transformer substation direct-current power supply state monitoring system of this embodiment also includes current transformer, current transformer measure the charge-discharge current on the battery cable, current transformer output directly gets into the 26 # pin (P3.0) of main control unit U3 and carries out collection processing.
Other structures and parameters are the same as in the first or second embodiments.
The specific embodiment IV is as follows:
in the transformer substation direct current power supply state monitoring system of the embodiment, the system power supply of the main controller U3 is 3.3V, the system power supply is connected with the resistor R11 and the capacitor C4, the capacitor C4 is grounded, the resistor R11 is connected with the pin 2 and the pin 3 of the main controller U3, namely, the system power supply supplies power to the main controller U3 through the resistor R11 and the capacitor C4, and the stability of the power supply is ensured; as shown in fig. 7, the reference source adopts the internal reference of the main controller U3, the pin 8 of the main controller U3 is respectively connected with the tantalum capacitor C12 and the capacitor C11, and the tantalum capacitor C12 and the capacitor C11 are commonly connected to the GND end, so that the reference source is stable, and the accuracy of AD acquisition is ensured.
Other structures and parameters are the same as in one to three embodiments.
Fifth embodiment:
the substation direct-current power supply state monitoring system of the embodiment further comprises a communication module, wherein the signal output end of the main controller U3 is connected with the signal input end of the communication module, and the signal input end of the main controller U3 is connected with the signal output end of the communication module; the main controller U3 sends the acquired data to the monitoring center through communication and receives instruction information of the monitoring center through communication and simultaneously, the monitoring analysis software processes temperature data and current and performance data of the storage battery, reliability data of the storage battery are obtained through calculation and analysis, alarm can be given when abnormality occurs, guarantee is provided for safety work of sealing the storage battery of the transformer substation, and power supply safety of the transformer substation is improved.
Other structures and parameters are the same as those of the first to fourth embodiments.
Specific embodiment six:
the transformer substation direct current power supply state monitoring system of the embodiment further comprises a display module, wherein the signal output end of the main controller U3 is connected with the signal input end of the display module and is used for displaying state information of a storage battery and state information of commercial power;
the state information of the storage battery comprises temperature data, current, voltage and internal resistance information of the storage battery;
the mains supply state information comprises information about whether mains supply is lost or not and information about switching states of the discharging instrument and the storage battery pack.
When the substation direct-current power supply state monitoring system is provided with all the detection circuits and modules, the main controller U3 is used for detecting the temperature, the voltage, the current and the internal resistance of the storage battery and is also responsible for mains supply monitoring, mains supply switching control, storage battery switching control, discharge instrument switching control and storage battery balance control.
Other structures and parameters are the same as those of one to fifth embodiments.
Seventh embodiment:
a method for monitoring power supply state by using a transformer substation direct current power supply state monitoring system comprises the following steps:
before the main controller U3 detects the state of the storage battery for the first time, initializing temperature data, voltage data, current data and internal resistance data of the storage battery;
the main controller U3 receives an instruction of the monitoring center for detecting the storage battery through a communication touch quickly, the main controller U3 firstly detects whether the commercial power corresponding to the transformer substation is lost through a commercial power detection circuit in real time, when the commercial power is lost, the main controller U3 controls a discharging instrument-storage battery pack switching control circuit to switch the load of the transformer substation onto a storage battery line, the storage battery is not detected, the storage battery is controlled to supply power to the transformer substation, if the storage battery is in discharge detection, the discharging is stopped immediately, the load of the transformer substation is switched onto the storage battery line, and the storage battery is controlled to supply power to the transformer substation;
when the mains supply is normal, the main controller U3 controls the discharge instrument-storage battery pack switching control circuit to control the mains supply to supply power to the transformer substation, and judges whether the discharge instrument meets discharge conditions or not;
when the discharging condition is met, the storage battery is controlled to be discharged through a discharging instrument, and temperature, voltage and charging and discharging current information of the storage battery are acquired through a storage battery temperature acquisition circuit, a storage battery voltage detection circuit and a current transformer respectively in the discharging process; meanwhile, judging whether the discharge instrument meets the discharge termination condition, if so, stopping discharging, and stopping the detection of the storage battery, otherwise, continuing to detect the storage battery;
when the discharging condition is not met, the charging of the storage batteries is controlled by the charge balance control circuit, and the charging capacity, the charging current and the charging voltage of each storage battery are monitored in the charging process; and the internal resistance of the storage battery is acquired through the internal resistance measuring module in the charging process.
Claims (7)
1. The transformer substation direct-current power supply state monitoring system is characterized by comprising a main controller, a mains supply detection circuit, a discharging instrument-storage battery pack switching control circuit, a storage battery temperature acquisition circuit, a plurality of charge balance control circuits and a plurality of internal resistance measurement modules;
the main controller U3 is a singlechip with the model of C8051F 500;
in the commercial power detection circuit, a commercial power N and a commercial power L are respectively connected with pins 4 and 5 of a coil winding of a Relay, and a pin 2 of the Relay is connected with a pin 32 of a main controller U3; when the mains supply is normal, the No. 2 pin of the Relay is disconnected from the GND pin of the Relay, and the corresponding state is that the mains supply is normal; when the mains supply is lost, the No. 2 pin of the Relay and the GND pin of the Relay are conducted, and the corresponding state is that the mains supply is lost;
the discharging instrument-storage battery pack switching control circuit comprises a mains supply switching control K1, a storage battery switching control K2, a first double-switching Relay-DPDT, a second double-switching Relay-DPDT and a storage battery circuit;
the first double-throw double-switch Relay-DPDT controls the mains supply switching control K1, the second double-throw double-switch Relay-DPDT controls the storage battery switching control K2, and the 'transformer substation load+' and the 'transformer substation load-' are respectively connected with a storage battery line or mains supply through the mains supply switching control K1; the storage battery plus and the storage battery minus are respectively connected with a storage battery line or a discharging instrument through storage battery switching control K2;
the two pins of the coil winding of the Relay-DPDT of the first double-throw double-switch Relay are respectively 'mains supply switching+' and 'mains supply switching-', the 'mains supply switching+' is connected to a power supply of the system, and the 'mains supply switching-' is connected with the 31 pins of the main controller U3;
the two pins of the coil winding of the Relay-DPDT of the second double-throw Relay are respectively 'storage battery throw-in+' and 'storage battery throw-out-', the storage battery switching plus is connected to a power supply of the system, and the storage battery switching plus is connected with 30 pins of the main controller U3;
in the charge balance control circuits, each charge balance control circuit corresponds to one storage battery, the charge balance control circuits are respectively marked as balance 1 to balance x and are respectively connected with each storage battery BT1 to BTx; the Bat+ pin of each charge equalization control circuit is respectively connected with the anode of the storage battery, the Bat+ pin of each charge equalization control circuit is respectively connected with the cathode of the storage battery, the Vcc+ of the equalization 1 is connected with the charger+, "Vcc of the equalization x is connected with the charger-," Vcc of the equalization 1 to the equalization x-1 is connected with the Vcc of the previous storage battery;
the storage battery temperature acquisition circuit comprises a plurality of 1-wire bus 18B20 chips, the plurality of 18B20 chips are directly connected in parallel, and each 18B20 chip corresponds to one storage battery temperature; the Vcc pin of each 18B20 chip is connected with the positive power supply, the Gnd pin of each 18B20 chip corresponds to the negative power supply, and the Dq pin of each 18B20 chip sends temperature data to the main controller U3 for real-time temperature acquisition of the storage battery;
each internal resistance measurement module corresponds to one section of storage battery, res+ of the internal resistance measurement module is connected with the positive side of the storage battery, res- "of the internal resistance measurement module is connected with the negative side of the storage battery, and comA of the internal resistance measurement module and comB data pins of the internal resistance measurement module are respectively connected to pin 34 and pin 33 of the controller U3; each internal resistance measurement module outputs data through the comA of the internal resistance measurement module and the comB data pin of the internal resistance measurement module respectively.
2. The substation dc power supply status monitoring system according to claim 1, further comprising a battery voltage detection circuit, the battery voltage detection circuit being connected to pin 33 and pin 34 of the main controller U3.
3. The system of claim 2, further comprising a current transformer, wherein the current transformer measures the charge and discharge current on the battery cable, and the output of the current transformer directly enters pin 26 of the main controller U3.
4. The system for monitoring the state of a direct current power supply of a transformer substation according to claim 3, wherein the system power supply of the main controller U3 is 3.3V, the system power supply is connected with a resistor R11 and a capacitor C4, the capacitor C4 is grounded, the resistor R11 is connected with a pin 2 and a pin 3 of the main controller U3, that is, the system power supply supplies power to the main controller U3 through the resistor R11 and the capacitor C4; the reference source adopts the internal reference of the main controller U3, the pin 8 of the main controller U3 is respectively connected with the tantalum capacitor C12 and the capacitor C11, and the tantalum capacitor C12 and the capacitor C11 are commonly connected to the GND end.
5. The system for monitoring the state of the direct current power supply of the transformer substation according to claim 4, further comprising a communication module, wherein the signal output end of the main controller U3 is connected with the signal input end of the communication module, and the signal input end of the main controller U3 is connected with the signal output end of the communication module; the main controller U3 sends the collected data to the monitoring center through a communication module, and simultaneously receives instruction information of the monitoring center through the communication module.
6. The system for monitoring the state of the direct current power supply of the transformer substation according to claim 5, further comprising a display module, wherein the signal output end of the main controller U3 is connected with the signal input end of the display module and is used for displaying the state information of the storage battery and the state information of the commercial power;
the state information of the storage battery comprises temperature data, current, voltage and internal resistance information of the storage battery;
the mains supply state information comprises information about whether mains supply is lost or not and information about switching states of the discharging instrument and the storage battery pack.
7. A method for monitoring power supply state by using a substation direct-current power supply state monitoring system, which is realized based on the substation direct-current power supply state monitoring system according to claim 6; characterized in that the method comprises the steps of:
the main controller U3 receives an instruction of the monitoring center for detecting the storage battery through a communication touch quickly, the main controller U3 firstly detects whether the commercial power corresponding to the transformer substation is lost through a commercial power detection circuit in real time, when the commercial power is lost, the main controller U3 controls a discharging instrument-storage battery pack switching control circuit to switch the load of the transformer substation onto a storage battery line, the storage battery is not detected, the storage battery is controlled to supply power to the transformer substation, if the storage battery is in discharge detection, the discharging is stopped immediately, the load of the transformer substation is switched onto the storage battery line, and the storage battery is controlled to supply power to the transformer substation;
when the mains supply is normal, the main controller U3 controls the discharge instrument-storage battery pack switching control circuit to control the mains supply to supply power to the transformer substation, and judges whether the discharge instrument meets discharge conditions or not;
when the discharging condition is met, the storage battery is controlled to be discharged through a discharging instrument, and temperature, voltage and discharging current information of the storage battery are acquired through a storage battery temperature acquisition circuit, a storage battery voltage detection circuit and a current transformer respectively in the discharging process; meanwhile, judging whether the discharge instrument meets the discharge termination condition, if so, stopping discharging, and stopping the detection of the storage battery, otherwise, continuing to detect the storage battery;
when the discharging condition is not met, the charging of the storage battery is controlled by the charge balance control circuit, and the charging capacity, the charging current and the charging voltage of each storage battery are monitored in the charging process; and the internal resistance of the storage battery is acquired through the internal resistance measuring module in the charging process.
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| CN113890128A (en) * | 2021-08-30 | 2022-01-04 | 航天长屏科技有限公司 | Online maintenance system and online maintenance method for storage battery |
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