An uninterrupted power supply switching method based on Ethernet and Beidou short message communication

Abstract

The application discloses an uninterrupted power supply switching method based on Ethernet and Beidou short message communication, relates to the technical field of uninterrupted power supply switching, and aims to solve the problems that the traditional power supply switching method can cause short-time power supply interruption and complicated process. The method comprises the following steps: S1: configuring Ethernet communication, including setting the IP address, port number, subnet mask and gateway of the power distribution station in the same network segment or cross-network segment scene, and further configuring the route when cross-network segment; if there is no intercommunication between the special network and the office network among the power distribution stations, a communication front-end machine is additionally arranged in the master station, different VLANs and firewalls are configured to realize data intercommunication, and one-to-one NAT conversion is enabled in the firewall to ensure normal communication of the service. The application has the advantages of effectively improving the reliability and safety of uninterrupted power supply switching of the self-closing line, ensuring the quickness of fault isolation in the switching process, and improving the operation and inspection technical level.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of uninterrupted power supply switching, in particular to an uninterrupted power supply switching method based on Ethernet and Beidou short message communication. BACKGROUND

[0002] UPS uninterrupted power supply systems have been widely applied to various industries and provide high-quality, reliable and safe power supply for various devices, and play an important protection role in the good operation and service life of various devices, especially some key devices. The UPS uninterrupted power supply system follows the principles of system maturity, openness and reliability, and mainly adopts two types of high-frequency machines and power-frequency machines.

[0003] The high-frequency machine adopts an insulated gate bipolar transistor (IGBT) rectifier, and the advantages thereof are high output efficiency, no transformer, light weight, small size, low noise, small influence on space and environment, low price compared with the power-frequency machine, and suitability for small space, good working environment and budget limitation. The disadvantage of the high-frequency machine is that the output of the high-frequency machine is not isolated by a transformer, if the inverter power device is short-circuited, the high direct-current voltage on the direct-current bus is directly added to the load, the anti-impact capability is low, and the high-frequency machine without an output transformer does not have the isolation harmonic function, and is not suitable for power supply environments and harsh use environments of factories.

[0004] The power-frequency machine adopts a thyristor (SCR) rectifier, and the advantages of the power-frequency machine are high anti-impact capability and high reliability compared with the high-frequency machine. The power-frequency machine belongs to an industrial type in design, and can adapt to harsh power supply environments and use environments. The disadvantage of the power-frequency machine is that the power-frequency machine is provided with an isolation transformer, the output efficiency is low, the floor bearing requirement is relatively high, the size is large, the space requirement is high, and the price is high.

[0005] In the petroleum and petrochemical, coal, metallurgy and manufacturing industries, in order to ensure uninterrupted power supply of industrial enterprises, key technologies such as fast mechanical switch, fast detection, manual zero-crossing, forced zero-crossing, lossless current limiting, lossless peak limiting current limiting, ultra-high-speed flexible switching, no-delay relay protection cooperation and single-phase grounding fault fast disposal without power interruption are usually adopted. The mechanical action time of the fast mechanical vacuum switch based on the repulsion mechanism can be controlled within 1 ms, and can be controlled within 0.1 ms in general, so that phase control can be realized. However, efficient and reliable communication needs to be established. The single-phase grounding fast disposal technology based on fault phase grounding can quickly extinguish arc without power interruption, and can select the grounding line. After the production process is completed or the load is switched to other normal paths, the processing is performed again.

[0006] In summary, the current mainstream uninterruptible power supply technology is mainly based on a single station / site, and the railway 10kV distribution station belongs to the jurisdiction of the power supply section, and the through / self-closing feed-out provides power for important train loads such as signals along the line, and the next level equipment of the through / self-closing feed-out belongs to the jurisdiction of the electric power section, and the through / self-closing feed-out from two different sites of the 10kV distribution station is the power supply for the next level equipment, and the through / self-closing feed-out of each distribution station is only judged and operated by the local collected information, and there is no information interaction and linkage between the distribution stations, and when a certain road through / self-closing feed-out fails, the power supply is provided by the through / self-closing feed-out of the adjacent station through the self-throw function of the protection device, and the process is to first disconnect the fault side breaker and then connect the non-fault side breaker, and there is a short-term power interruption, and when the through / self-closing feed-out is power switched under non-fault conditions, manual phase checking and measurement observation of key electrical quantities such as pressure difference, angle difference and frequency difference are used to perform ring closing switching, and there is a certain degree of difficulty and risk, and if power switching is performed, the relevant personnel of the electric power section need to cooperate, and the process is relatively complex.

[0007] In view of this, an uninterrupted power supply switching method based on Ethernet and Beidou short message communication is proposed. SUMMARY

[0008] The purpose of the present application is to provide an uninterrupted power supply switching method based on Ethernet and Beidou short message communication, which aims to solve the problems of short-term power interruption and complex process in the traditional power supply switching method.

[0009] To solve the above technical problems, the present application provides the following technical scheme: an uninterrupted power supply switching method based on Ethernet and Beidou short message communication, which comprises the following steps:

[0010] S1: configuring Ethernet communication, including setting the IP address, port number, subnet mask and gateway of the distribution station in the same network segment or cross-network segment scenario, and configuring the route when crossing the network segment, and if there is no intercommunication between the distribution stations and the office network, a communication front-end machine is added to the main station, and data intercommunication is realized by configuring different VLAN and firewalls, and one-to-one NAT conversion is enabled in the firewall to ensure normal communication of the business;

[0011] S2: based on Ethernet communication, a Beidou module is installed to realize Beidou short message communication, the Beidou module needs to be installed on the roof and there is no obstruction in the south direction, and RS232 serial port connection is adopted between the Beidou module and the switching device;

[0012] S3: setting the priority of Beidou short message communication higher than that of Ethernet communication to avoid conflict between the two;

[0013] S4: checking the power status of the Beidou module on the interface of the switching device to intuitively reflect the Beidou signal quality;

[0014] S5: Display the opposite side key data on the local power distribution, including the circuit breaker position, A / B / C phase current, zero sequence current, and set the unlock / lock knob to prevent misoperation;

[0015] S6: Before enabling the reverse switching device, the charging conditions must be met, including the reverse switching function being put into operation, normal communication with the opposite side, the local circuit breaker being in the split position, the opposite circuit breaker being in the closed position, the bus and line having voltage, and no PT wire breakage;

[0016] S7: According to the current criterion and zero sequence current criterion, the reverse switching function is locked when abnormal current is detected to prevent the failure of reverse switching from leading to the expansion of the fault;

[0017] S8: After meeting the differential pressure, angle difference, and frequency difference closed loop conditions, the local circuit breaker is automatically closed and the opposite circuit breaker is split after a set closing parallel time, realizing uninterrupted power supply reverse switching.

[0018] Preferably, the Ethernet communication scheme also includes a simplified configuration step, i.e. without configuring the opposite side network segment and subnet mask, only configuring the local IP, port number, subnet mask, gateway, and opposite side IP, port number.

[0019] Preferably, when the firewall uses dynamic address translation, one-to-one NAT conversion needs to be enabled, and the port number used for reverse switching is opened, and the corresponding strategy is added to make the business pass smoothly.

[0020] Preferably, the Beidou short message communication module sends a message every certain time to ensure the real-time and reliability of communication.

[0021] Preferably, the control loop of the reverse switching device is at the same level as the manual closing and opening loop of the existing protection, and is located at the front end of the existing protection device to ensure the accuracy and safety of the reverse switching operation.

[0022] Preferably, the charging conditions also include that the bus and line voltage and current are within the set range to ensure the smooth progress of the reverse switching operation.

[0023] Preferably, the set values of the current criterion and zero sequence current criterion can be adjusted according to the actual load condition and fault type to improve the flexibility and accuracy of the reverse switching operation.

[0024] Preferably, the setting value of the closing parallel time needs to be greater than the overcurrent time setting value, and the setting value of the overcurrent setting value needs to be greater than the maximum load current that can occur and less than the overcurrent setting value of the existing protection device to ensure the safety and reliability of the reverse switching operation.

[0025] Preferably, after the reverse switching device is started, if the closed loop condition is not met within a set time, the reverse switching operation is automatically ended to avoid system instability caused by long waiting time.

[0026] Preferably, after the switching action, the action report and recording are generated on both sides, and the recording frequency is 1200Hz, so as to facilitate subsequent fault analysis and troubleshooting.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. The present application is based on uninterrupted power supply switching based on Ethernet and Beidou short message communication, and the information interaction and linkage between multiple power distribution stations can be realized through automatic devices in the manner of "first parallel and then break", thereby effectively improving the reliability and safety of uninterrupted power supply switching of the through self-closing line, ensuring the quickness of fault isolation during switching, and improving the operation and inspection technology.

[0029] 2. The present application solves the problem of the influence of the switching mode on the existing equipment, and the switching mode should not affect the quick break, overcurrent and other conventional protection actions of the existing protection device, and should not affect the normal on-off operation of the local or remote side, and the maximum load current should be avoided during switching, and the switching value should be less than the quick break and overcurrent action value of the existing protection device, so as to avoid the misoperation of the existing protection device, and realize the normal operation without influence, accurate action in fault, and uninterrupted power supply during switching.

[0030] 3. The present application solves the problem of information interaction and linkage between two power distribution stations: for the switching process of the through self-closing line, the strategy research on the information interaction and discrimination of the through self-closing line between two power distribution stations is carried out, the communication mode of mainly using the existing Ethernet channel of two power distribution stations and supplementarily using Beidou short message communication is proposed, the data transmission is realized through self-defined protocol, and the relevant information of the opposite side can be seen in the local power distribution station and linked with the opposite side.

[0031] 4. The present application solves the problem of accurate discrimination during switching: starting from the voltage, current, phase, angle difference, frequency and circuit breaker position of the through self-closing line between two power distribution stations, according to reasonable discrimination logic, whether the loop closing operation condition is met is accurately and correctly discriminated, the fault characteristics during switching are researched, the fault characteristics such as input and output circuits, human factors are summarized, how to quickly restore power supply under fault condition is researched, the mode of blocking switching due to excessive load on the opposite side or excessive zero sequence current on the opposite side before loop closing is proposed, the mode of disconnecting the local circuit breaker due to excessive current on the local side after loop closing is proposed, and the influence range under fault condition is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a flowchart of the uninterrupted power supply switching method of the present application;

[0033] Figure 2 It is a schematic diagram of the Ethernet communication method in the present application;

[0034] Figure 3Schematic diagram of the Beidou short message communication method in the present invention;

[0035] Figure 4 This is a schematic diagram of the connection of the inverted cutting device in the present invention. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] The present invention mainly adopts Ethernet communication and Beidou short message technology as a means of emergency communication to form a mass-produced through-automatic closing line uninterruptible power supply switching device, which breaks through the traditional manual switching method and does not require the cooperation of multiple personnel. Uninterruptible power supply switching can be achieved through one-key operation of the switching device. By monitoring the voltage, current, phase, angle difference, frequency and circuit breaker position of the through-automatic closing line of the distribution stations on both sides, information interaction of the through-automatic closing line of the distribution stations on both sides is realized, and accurate and effective judgment is made to ensure the reliability and safety of switching, thereby improving the robustness and fault isolation capability of the through-automatic closing line uninterruptible power supply switching.

[0038] Example 1

[0039] by Figure 2 As shown in the figure, substations 1 and 2 are two power sources for the next-level loads, and substations 1 and 3 are two power sources for another next-level load. In actual situations, substations 1, 2, and 3 are usually in different network segments. Routing does not need to be configured if they are in the same network segment, but routing is required if they are in different network segments. If substations 1 and 2 are both private networks, they can communicate with each other. To avoid being affected by other devices in the channel, substation 1 is configured with its local IP address, port number, subnet mask, and gateway, as well as substation 2's IP address, port number, subnet mask, and network segment. Substation 2 is configured with its local IP address, port number, subnet mask, and gateway, as well as substation 1's IP address, port number, subnet mask, and network segment. In simplified configuration, the opposite network segment and subnet mask do not need to be configured. Only the local IP address, port number, subnet mask, gateway, and the opposite IP address and port number need to be configured.

[0040] If substation 1 is a private network and substation 3 is an office network, since the private network and the office network are not interoperable, a new communication front-end is added to the main station. The existing three-layer switch at the main station has divided different VLANs. Substation 1, substation 3, the newly added communication front-end, and the lower end of the firewall are in different VLANs. The lower end of the firewall can communicate with substation 1 and substation 3 respectively, and the upper end of the firewall can communicate with the communication front-end. Due to the limitation of the number of addresses, the firewall has used dynamic address translation (both IP and port numbers will change). To ensure that the related services of reverse switching can be opened normally, it is necessary to enable one-to-one NAT conversion in the firewall (only convert IP), and at the same time open the port number used for reverse switching and add corresponding policies to enable the business to pass smoothly. Configure the local IP, port number, subnet mask and gateway of substation 1 and the IP, port number, subnet mask and network segment related to the newly added communication front-end at the main station. Configure the local IP, port number, subnet mask and gateway of substation 3. As well as the IP, port number, subnet mask, and network segment related to the newly added communication front-end machine at the master station. The newly added communication front-end machine at the master station is configured with the local IP, port number, subnet mask, and gateway, as well as the IP, port number, subnet mask, network segment of distribution station 1 and the IP, port number, subnet mask, and network segment of distribution station 2. At the same time, the newly added communication front-end machine at the master station needs to be configured with a rule to bind the communication between distribution station 1 and distribution station 3, so that data can be transferred through the communication front-end machine. Under simplified configuration, there is no need to configure the opposite network segment and subnet mask. Only the local IP, port number, subnet mask, gateway, and the opposite IP and port number are configured. Note that for more substations, multiple communication front-end machine rules can be configured to meet actual needs, and they will not interfere with or affect each other. It is particularly important to note that because the firewall uses one-to-one NAT address conversion, the switching device and the communication front-end machine need to configure the converted address when configuring the relevant parameters on the opposite side (the port number remains unchanged).

[0041] When communication is established between the switching devices, an ARP packet is first sent to inquire about the MAC address of the other side. After receiving it, a UDP packet is sent and the relevant information is viewed through the packet capture software.

[0042] like Figure 3 As shown, on the basis of Ethernet communication, a Beidou module is installed to realize Beidou short message communication. The Beidou module needs to be installed on the roof and face south without obstruction to ensure normal reception of Beidou signals. The Beidou module and the switching device are connected by RS232 serial port. The Beidou module sends a message every 1 minute. In order to avoid conflict between Ethernet communication and Beidou short message communication, the priority of Beidou short message communication is set higher than Ethernet communication, that is, Ethernet communication is invalid in Beidou short message communication mode. The protocol content between the Beidou module and the switching device includes power detection, communication application, IC card detection, feedback information, system self-test, etc. When the Beidou short message communication is established, it can be viewed by logging into the switching device or the communication front-end through the debugging serial port.

[0043] The control loop of the switching device is at the same level as the existing protection manual switching loop, and is located at the front end of the existing protection device. When normal power transmission and stop are performed, the operation and maintenance personnel switches the circuit breaker through local operation or remote control, and the switching device only records the position change information and voltage and current information of the circuit breaker, and does not control the loop. When the circuit is faulty and the circuit breaker is tripped, the switching device only records the position change information and voltage and current information of the circuit breaker, and does not control the loop. When power switching is needed, the switching device is enabled to realize uninterrupted power switching.

[0044] As shown in Figure 4 When the opposite side current is greater than the set current value, the local side switching device delays for 10s to report the opposite side heavy load signal under the condition that the current criterion enabling control word is put in, and returns the signal after the current is restored for 1.25s, and the switching function is locked out. This method is to avoid the influence of switching failure under heavy load.

[0045] After the local side switching device is started, the pressure difference, angle difference and frequency difference are satisfied within 70s, and the local side circuit breaker is automatically closed. After the closing and parallel time delay, the opposite side circuit breaker is automatically opened. If the switching process exceeds 70s, the switching process is ended, and no control command is sent. Because a large current may be generated during the closing, the local side circuit breaker is opened when the local side current is greater than the set current value under the condition that the overcurrent enabling control word is put in, and the switching process is ended. In order to avoid the situation that both sides of the circuit breaker are opened, the setting value of the closing and parallel time must be greater than the setting value of the overcurrent time. The setting value of the overcurrent must be greater than the maximum load current and less than the overcurrent setting value of the existing protection device. Finally, the normal operation is not affected, the fault is accurately operated, and the power is uninterrupted during switching.

[0046] The embodiments of the present application are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, and are within the protection scope of the present application.

Claims

1. A method for uninterruptible power supply switching based on Ethernet and Beidou short message communication, characterized in that: The method comprises the following steps: S1: Configure Ethernet communication, including setting the IP address, port number, subnet mask, and gateway of the power distribution station in the same network segment or across network segments. Routing is also required when across network segments. If there is a lack of intercommunication between the private network and the office network between power distribution stations, add a communication front-end processor at the master station and implement data intercommunication by configuring different VLANs and firewalls. Enable one-to-one NAT translation in the firewall to ensure normal business communication. S2: Based on Ethernet communication, a Beidou module is installed to realize Beidou short message communication. The Beidou module needs to be installed on the roof and face south without obstruction. The Beidou module and the inverted cutting device are connected via RS232 serial port. S3: Set the priority of Beidou short message communication to be higher than Ethernet communication to avoid conflicts between the two; S4: Check the Beidou module power status on the reverse switching device interface to intuitively reflect the Beidou signal quality; S5: Display key data of the opposite side at the local distribution station, including circuit breaker position, A / B / C phase current, and zero-sequence current. An unlock / lock knob is also set to prevent misoperation. S6: Before the reverse tripping device is activated, the charging conditions must be met, including the reverse tripping function being enabled, normal communication with the opposite side, the circuit breaker on this side being open, the circuit breaker on the opposite side being closed, the busbar and line being pressurized, and no PT being broken. S7: Based on the current criterion and the zero-sequence current criterion, the reverse switching function is locked when abnormal current is detected to prevent the failure of reverse switching from causing the fault to expand; S8: When the closing conditions of voltage difference, angle difference and frequency difference are met, the circuit breaker on this side is automatically closed and the circuit breaker on the opposite side is opened after the set closing parallel time, realizing uninterrupted power supply switching.

2. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The Ethernet communication solution also includes simplified configuration steps, that is, there is no need to configure the opposite side network segment and subnet mask, only the local IP, port number, subnet mask, gateway and the opposite side IP and port number need to be configured.

3. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: When the firewall adopts dynamic address translation, it is necessary to enable one-to-one NAT translation, open the port number used for reverse switching, and add corresponding policies to enable the business to pass smoothly.

4. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The Beidou short message communication module sends a message at regular intervals to ensure the real-time and reliability of communication.

5. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The control circuit of the reverse cutting device is at the same level as the manual opening and closing circuit of the existing protection and is located at the front end of the existing protection device to ensure the accuracy and safety of the reverse cutting operation.

6. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The charging conditions also include that the busbar and line voltage and current are within a set range to ensure smooth switching operation.

7. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The setting values ​​of the current criterion and the zero-sequence current criterion can be adjusted according to the actual load conditions and the fault type to improve the flexibility and accuracy of the reverse switching operation.

8. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1 is characterized in that: The setting value of the closing parallel time needs to be greater than the overcurrent time setting value, and the setting value of the overcurrent setting value needs to be greater than the maximum load current that can occur and less than the overcurrent setting value of the existing protection device to ensure the safety and reliability of the reverse cutting operation.

9. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1, characterized in that: After the back-cutting device is started, if the loop closing condition is not met within the set time, the back-cutting operation will be automatically terminated to avoid system instability caused by long waiting time.

10. The uninterruptible power supply switching method based on Ethernet and Beidou short message communication according to claim 1, characterized in that: After the reverse switching action, both the local side and the opposite side generate action reports and recordings with a recording frequency of 1200Hz to facilitate subsequent fault analysis and troubleshooting.

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