CN209764986U - Transformer substation direct current bus and branch on-off integrity detection system thereof - Google Patents
Transformer substation direct current bus and branch on-off integrity detection system thereof Download PDFInfo
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- CN209764986U CN209764986U CN201920433653.7U CN201920433653U CN209764986U CN 209764986 U CN209764986 U CN 209764986U CN 201920433653 U CN201920433653 U CN 201920433653U CN 209764986 U CN209764986 U CN 209764986U
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Abstract
The utility model discloses a transformer substation's direct current generating line and branch road break-make integrality detecting system, this detecting system contain an emergency power source's communication supervisor to and the direct current branch road detecting element that a plurality of distributions were placed. The voltage of each branch bus, the over-temperature and position condition of a breaker or a fuse are monitored in real time through a communication mode based on wired carrier waves and wireless Lora, inquiry carrier signals are sent through a communication manager of the emergency power supply, and feedback information of a detection unit is collected to realize overall monitoring and alarming of the direct current bus of the transformer substation, so that the method is very suitable for the field of emergency guarantee of the direct current bus of the transformer substation.
Description
Technical Field
The invention relates to a transformer substation direct-current bus and a branch circuit on-off integrity detection system thereof, and belongs to the technical field of power electronics.
Background
In recent years, with the development of economy, the number and the scale of the substations become larger, so that the requirement on the reliability of power supply becomes larger, and the design requirement of the substations becomes higher. Although the direct current bus is supplied with power by a plurality of chargers and storage battery packs, the phenomenon that the breaker and the fuse are overhauled for a long time or cannot supply power normally due to human factors and other reasons still exists, so that the direct current bus of the transformer substation still has certain potential safety hazards, once the direct current system breaks down, the breaker of primary equipment of the transformer substation is refused, and the safe operation of various electrical equipment in the transformer substation is seriously threatened, and even a large-area power failure accident is caused. Reports show that phenomena such as main transformer damage, override trip and the like caused by direct current system faults occur frequently, normal operation of power enterprises is seriously interfered, and certain economic loss and social influence are caused.
Disclosure of Invention
in order to solve the technical problems, the invention provides a substation direct current bus and a branch on-off integrity detection system thereof, which monitors the voltage of each branch bus, the over-temperature and position conditions of a breaker or a fuse in real time through a communication mode based on wired carrier and wireless Lora, sends an inquiry carrier signal through a communication manager of an emergency power supply, and collects feedback information of a detection unit to realize the overall monitoring and alarm of the substation direct current bus.
The invention is realized by adopting the following technical scheme:
A transformer substation direct current bus and branch on-off integrity detection system thereof comprises a communication manager of an emergency power supply and a plurality of distributed direct current branch detection units; the communication manager comprises a plurality of outlets, each outlet is directly connected with each section of direct current bus, the number of the direct current branch detection units is equal to that of the branch direct current branches, and the detection units are respectively connected with the direct current lines on one sides, close to the load, of the circuit breakers and the fuses of the branch direct current branches.
the communication manager is responsible for sending carrier inquiry signals according to address cycle and receiving and analyzing feedback signals of all detection units.
The communication manager comprises power line carrier and Lora communication functions, and is in an active sending mode, but is in power line carrier inquiry under normal conditions; the inquiry detection unit at the moment can be activated through Lora communication as long as the power line carrier cannot receive the response signal of the inquiry detection unit; if the first Lora query still cannot receive the feedback signal of the power line carrier, the second Lora query is started.
Each detection unit also comprises power line carrier and Lora communication functions, but all the detection units are in a passive receiving mode, and in any activation mode, each detection unit can send a check code containing an address only after receiving an instruction of a communication manager.
The method for detecting the on-off integrity of the direct current bus and the branch of the direct current bus of the transformer substation comprises the following steps:
1) The communication manager sends a carrier inquiry signal to the detection unit according to the address and waits for the detection unit to reply;
2) The detection unit sends a feedback signal after receiving the instruction of the communication manager;
3) After receiving the feedback signal, the communication manager compares the feedback signal with the similar signal, and if the feedback is not abnormal, the communication manager returns to the step (1) to continuously inquire the next detection unit; if the feedback is abnormal or the reply cannot be received, entering the step (4);
4) The communication manager sends a wireless signal through the Lora module to inquire the detection unit at the moment again and waits for receiving the carrier signal sent by the detection unit;
5) if the correct information is received, recording the address number of the detection unit and the failure reporting times, and returning to the step (1) to continuously inquire the next detection unit; and (4) if the reply is abnormal again or the reply cannot be received, the problem of the direct current branch where the detection unit is located is shown, the step (4) is returned to start the second Lora inquiry, and meanwhile, alarm information is sent to the existing monitoring system of the transformer substation. The transformer substation has an own SCADA system and an energy management system.
the feedback signal in the step 2) is check code information containing an address, and comprises bus voltage, over-temperature of a circuit breaker or a fuse and a position signal.
If the number of fault reporting times of the related detection unit within 24 hours exceeds 3, simultaneously sending alarm information to remind operators; otherwise, automatically clearing the fault error reporting times record of the detection unit.
If each detection unit finds that the voltage of the bus of the detection unit is reduced to be lower than the threshold value, the state information of the detection unit is automatically sent through the power line carrier and the Lora communication function, the communication manager is automatically informed, and the communication manager sends an alarm.
The invention has the following beneficial effects:
1. The direct-current line carrier technology is fully utilized, and the disconnection fault of the direct-current circuit can be naturally found through the existence of a reply signal;
2. the voltage of the direct current branch is measured, whether the branch is in voltage loss can be judged, the over-temperature and position information of the circuit breaker or the fuse is matched, the condition of the direct current branch can be comprehensively judged, and misjudgment caused by sensor errors or damage is reduced;
3. Information is transmitted jointly through a direct-current line carrier technology and Lora communication, so that the defect of a single communication mode is avoided, and the reliability is improved;
4. the communication polling mode and the mutual information comparison mode are judged, and the judgment method is simple and reliable;
5. All circuits are convenient to install and have no obvious breakpoints.
Drawings
Fig. 1 is a wiring diagram of a substation dc bus and a branch on-off integrity detection system thereof according to the present invention;
FIG. 2 is a schematic diagram of the communications manager of the present invention;
FIG. 3 is a schematic diagram of a detection unit of the present invention;
FIG. 4 is a schematic diagram of the mutual information comparison of the present invention;
FIG. 5 is a diagram of the frame format of the communication manager of the present invention;
FIG. 6 is a diagram of a detecting unit information frame format according to the present invention.
Detailed Description
the invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
as shown in fig. 1, a system for detecting the on-off integrity of a dc bus and its branches of a substation includes a communication manager of an emergency power supply, and a plurality of dc branch detection units distributed. The communication manager comprises a plurality of outlets, each outlet is directly connected with each section of direct current bus, the number of the detection units is equal to the number of the branch direct current branches, and the detection units are respectively connected with a direct current line on one side, close to a load, of a breaker or a fuse of each branch direct current branch.
As shown in fig. 2, the communication manager includes an MCU, a power supply, a communication circuit, and a sensor circuit. The MCU singlechip adopts STM32F407 series and comprises 6 serial ports, 5 paths of ADC interfaces, one path of HMI interfaces and 5 paths of IO interfaces. 6 routes of serial ports are externally corresponding to UARTA1-UARTA6 of fig. 2 respectively, 5 routes of ADC interfaces are connected with direct current voltage signals conditioned by 5 sections of bus voltage sensors, 5 routes of IO interfaces are connected with 5 bus-coupled circuit breaker position sensor signals respectively after passing through an isolation optocoupler, and an HMI interface is connected with external human-computer interface equipment and used for parameter setting and state display.
The system is responsible for collecting 5 sections of direct current bus voltage, 5 bus tie breaker position signals, issued instructions and collecting feedback related information. The power supply part is directly connected with the positive end and the negative end of the direct current bus 1 to generate isolated 3.3V and sensor +/-12V voltage. The voltage sensor circuit comprises an isolation voltage Hall element, a conditioning operational amplifier and a +/-12V power supply, and an output signal of the operational amplifier is directly connected to an ADC (analog to digital converter) interface of the STM32F 407. The input of the voltage sensor circuit is 5 sections of direct current bus voltage, only 2 paths are used in figure 1, and the other 3 paths are standby. When the bus tie breaker is in the position of the breaking position, the output is 0, otherwise, the output is 1. The positions of the bus tie breakers are respectively connected with 5 paths of IO interfaces, only 2 paths are used in fig. 1, and the rest 3 paths are standby. The high-voltage output end of the power line carrier modulation module 1-5 is directly connected with the positive end and the negative end of the direct current bus 1-5, the low-voltage end is connected with the UARTA1-UARTA 5 interface of the STM32F407, the modulation module realizes high-voltage and low-voltage end isolation through a high-frequency transformer, the STM32F407 is responsible for analyzing and arranging data transmission according to the communication protocol shown in the figure 5 and the figure 6, only 2 paths are used in the figure 1, and the rest 3 paths are standby. The output end of the Lora module is connected with the wireless antenna, the other end of the Lora module is connected with the UARTA6 interface of the STM32F407, and the STM32F407 is responsible for analyzing and arranging data transmission according to the communication protocol of the graph 5 and the graph 6. The response level of the power line carrier modulation module is higher than that of the Lora module.
As shown in fig. 3, the detection unit includes an MCU single chip, a power supply part, a communication and sensor circuit. The MCU singlechip adopts STM32F103 series, and comprises 2 serial peripherals, 1-path ADC interface and 2-path IO interface. The 2-path serial port peripheral corresponds to UARTB1 and UARTB2 of fig. 3 respectively, the 1-path ADC interface is accessed to the direct-current voltage signal conditioned by the voltage sensor, and the 2-path IO interface is accessed to the temperature and position sensor signal respectively after passing through the isolation optocoupler.
the monitoring system is responsible for collecting outlet voltage of the circuit breaker or the fuse, over-temperature and position signals of the circuit breaker or the fuse, then collecting instructions sent by the communication manager through the communication port and feeding back related information. The power supply part is directly connected with the positive end and the negative end of the direct current bus to generate isolated 3.3V and +/-12V voltage of the sensor; the voltage sensor circuit comprises an isolation voltage Hall element, a conditioning operational amplifier and a +/-12V power supply, and an output signal of the operational amplifier is directly connected to an ADC (analog to digital converter) interface of the STM32F 103; the output of the temperature sensor is IO type, the output is 0 when the temperature is over-temperature (more than 65 ℃), otherwise the output is 1; when the position of the breaker is disconnected or the position of the fuse is not fused, the output is 0, otherwise, the output is 1; the high-voltage output end of the power line carrier modulation module is directly connected with the positive end and the negative end of the direct-current bus, the low-voltage end of the power line carrier modulation module is connected with the UARTB1 interface of the STM32F103, the modulation module realizes high-voltage and low-voltage end isolation through a high-frequency transformer, and the STM32F103 is responsible for analyzing and arranging data transmission according to the communication protocol shown in the figure 5 and the figure 6; the output end of the Lora module is connected with the wireless antenna, the other end of the Lora module is connected with a UARTB2 interface of the STM32F103, and the STM32F103 is responsible for analyzing and arranging data transmission according to the communication protocol of the graph 5 and the graph 6. The response level of the power line carrier modulation module is higher than that of the Lora module.
As described above, each detection unit also includes power line carrier and Lora communication functions, but all are in passive receiving mode, and in any activation mode, each detection unit will send a check code containing an address only after receiving an instruction from the communication manager. The information returned by each detection unit comprises bus voltage, temperature and position signals of a circuit breaker or a fuse, after the communication manager collects relevant information, similar signals are compared as shown in figure 4, and if the voltage of a certain branch circuit is abnormal compared with a reference value and historical data, an alarm is given out through an OR gate. Certainly, the sampling values of each detection unit MCU will pass through a filtering and protection judgment link, and if it is found that the own bus voltage drops below a threshold value (the threshold value of 220V system is 200V, the threshold value of 110V system is 100V) continuously for 3 times, the status information of the detection unit will be automatically sent through the power line carrier and Lora communication functions, and automatically notified to the communication manager, and the communication manager will send an alarm.
Fig. 5 is an example of a frame format of the query message from the communication manager, which includes a start bit, an address code, a command code, a CRC check code, and an end bit, and the formats of the power line carrier and the Lora communication are completely consistent.
fig. 6 is an example of a format of an information frame returned by the detection unit, which includes a start bit of the frame, an address code, a voltage value, a fault code, a CRC check code, and an end bit, and the formats of the power line carrier and the Lora communication are completely consistent. Both the start and end bits of a frame are equivalent to a 4 byte delay to distinguish different frames. The 8-bit address code is used for distinguishing 255 detection units, and the maximum inquiry unit number of the communication manager is set by a human-computer interface unit of the communication manager according to the actual configuration number of the detection units. The instruction code comprises 1 byte, wherein 03H is used for reading an instruction by a power line carrier, 30H is used for reading an instruction by Lora communication, and other instructions are reserved. The 12-bit voltage value is directly sampled and obtained by a 12-bit ADC of the MCU, the highest bit is positioned at the 8 th bit of the first byte of the 12-bit voltage value, the lowest bit is positioned at the 5 th bit of the second byte of the 12-bit voltage value, and the gain of the voltage value is set by a human-computer interface unit of the communication manager according to the actual gain of a sensor of the detection unit. The 4-bit fault code is positioned at the lower 4 bits of the second byte of the 12-bit voltage value, wherein the 4 th bit and the 1 st bit are reserved, the 2 nd bit represents the over-temperature information of the circuit breaker or the fuse, wherein 1 represents abnormal, and 0 represents normal; bit 3 represents breaker or fuse position information, where 1 represents the on position and 0 represents the off position. The CRC check code is a CRC check result of information frame data and is used for improving the accuracy of transmitted information.
The circuit uses power line carrier and Lora communication, and realizes on-off integrity monitoring of the whole region through a query mechanism of a communication manager, thereby effectively controlling potential safety hazards of a breaker and a fuse of a transformer substation; meanwhile, a complete response and response mechanism is realized, and the method is very suitable for the field of the direct-current bus of the transformer substation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The utility model provides a transformer substation's direct current generating line and branch road break-make integrality detecting system which characterized in that: the system comprises a communication manager comprising an emergency power supply and a plurality of distributed direct current branch detection units; the communication manager comprises a plurality of outlets, each outlet is directly connected with each section of direct current bus, the number of the detection units is equal to that of the branch direct current branches, and the detection units are respectively connected with a direct current line on one side, close to a load, of a breaker or a fuse of each branch direct current branch.
2. The substation direct current bus and branch on-off integrity detection system of claim 1, characterized in that: the communication manager is responsible for sending carrier inquiry signals according to address cycle and receiving and analyzing feedback signals of all detection units.
3. the substation direct current bus and branch on-off integrity detection system of claim 1, characterized in that: the communication manager comprises power line carrier and Lora communication functions, and is in an active transmission mode.
4. The substation direct current bus and branch on-off integrity detection system of claim 1, characterized in that: each detection unit also comprises power line carrier and Lora communication functions and is in a passive receiving mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920433653.7U CN209764986U (en) | 2019-04-02 | 2019-04-02 | Transformer substation direct current bus and branch on-off integrity detection system thereof |
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| CN201920433653.7U CN209764986U (en) | 2019-04-02 | 2019-04-02 | Transformer substation direct current bus and branch on-off integrity detection system thereof |
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