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

Abstract

The invention discloses an uninterruptible power supply switching method based on Ethernet and Beidou short message communication, relates to the technical field of uninterruptible power supply switching, and aims to solve the problems of short-time power supply interruption and complex flow of a traditional power supply switching method. Comprising the following steps: setting an IP address, a port number, a subnet mask and a gateway of a power distribution substation in a same network segment or cross-network segment scene, configuring a route during cross-network segment, if a private network and an office network between the power distribution substations do not communicate with each other, additionally arranging a communication front-end processor at a master station, and configuring different VLANs and firewalls to realize data communication. One-to-one NAT is enabled in the firewall to ensure normal communication of services. The method has the advantages that the reliability and safety of uninterrupted power supply switching of the through self-closing line are effectively improved, the quickness of fault isolation in the switching process is guaranteed, and the operation and inspection technical level is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of uninterruptible power supply switching, and more specifically, to an uninterruptible power supply switching method based on Ethernet and Beidou short message communication. Background Art

[0002] UPS uninterruptible power supply system has been widely used in all walks of life, providing high-quality, reliable and safe power supply for various equipment, and playing an important role in protecting the good operation and service life of various equipment, especially some key equipment. UPS uninterruptible power supply system follows the principles of system maturity, openness and reliability, and mainly adopts two categories: high-frequency machine and industrial frequency machine;

[0003] The high-frequency machine uses insulated gate bipolar transistor (IGBT) rectification, which has the advantages of high output efficiency, no transformer, light weight, small size, low noise, and little impact on space and environment. Compared with the industrial frequency machine, it is cheaper and suitable for places with small space, good working environment and limited budget. The disadvantage is that the high-frequency machine output is not isolated by a transformer. If the inverter power device is short-circuited, the high DC voltage on the DC bus is directly added to the load, and the impact resistance is low. There is no output transformer and no harmonic isolation function. It is not suitable for factories and other places with harsh power supply environment and use environment.

[0004] The industrial frequency machine uses a thyristor (SCR) rectifier. The advantages of the industrial frequency machine are strong impact resistance and higher reliability than the high-frequency machine. It is designed as an industrial model and can adapt to relatively harsh power supply environments and operating environments. Its disadvantages are that it has an isolation transformer, low output efficiency, high load-bearing requirements for the floor, large size, high space requirements, and high prices.

[0005] In the petroleum, petrochemical, coal, metallurgy, manufacturing and other industries, in order to ensure uninterrupted power supply to industrial enterprises, key technologies such as fast mechanical switching, fast detection, manual zero crossing, forced zero crossing, lossless current limiting, lossless peak limiting and current limiting, ultra-high-speed flexible switching, non-delay relay protection coordination and non-stop single-phase grounding fault rapid handling are usually used. When the fast mechanical vacuum switch based on the repulsive mechanism is opened, the mechanical action time can be controlled within 1ms, generally within 0.1ms, which is convenient for phase control, but it is necessary to establish efficient and reliable communication. The single-phase grounding rapid handling technology based on the fault phase grounding can quickly extinguish the arc without power outage, and the grounding line can be selected, and the processing can be carried out after the production process is completed or the load is switched to other normal paths;

[0006] In summary, the current mainstream uninterruptible power supply technology is mainly implemented based on a single station / location. The railway 10kV distribution station is under the jurisdiction of the power supply section, and its through / self-closing feed is the source of power for important traffic loads such as signals along the line. The next-level equipment of the through / self-closing feed is under the jurisdiction of the power section. The through / self-closing feed from the 10kV distribution stations at two different locations is the power supply for the next-level equipment. The through / self-closing feed of each distribution station is judged and acted only by the information collected locally, and there is no information interaction and linkage between distribution stations. When a through / self-closing feeder fails in a certain route, the through / self-closing feeder of the adjacent station will supply power through the automatic re-closing function of the protection device. The process is to first open the circuit breaker on the fault side and then close the circuit breaker on the non-fault side. There will be a short-term power interruption. When the through / self-closing feeder is used for power switching under non-fault conditions, in order to ensure uninterrupted power supply, manual phase checking and measurement and observation of key electrical quantities such as pressure difference, angle difference, and frequency difference are used to close the loop and switch. There are certain difficulties and risks. If a power outage is to be performed, the relevant personnel of the electrical section must cooperate, and the process is relatively complicated.

[0007] In view of this, we propose an uninterruptible power supply switching method based on Ethernet and Beidou short message communication. Summary of the invention

[0008] The purpose of the present invention is to provide an uninterruptible power supply switching method based on Ethernet and Beidou short message communication, aiming to solve the problems of short-term power supply interruption and complicated process in traditional power supply switching methods.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: an uninterruptible power supply switching method based on Ethernet and Beidou short message communication, the method comprising the following steps:

[0010] 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 also needs to be configured 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 machine to the master station, and implement data intercommunication by configuring different VLANs and firewalls. Enable one-to-one NAT conversion in the firewall to ensure normal business communication;

[0011] S2: 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 any obstruction. The Beidou module and the inverted cutting device are connected by RS232 serial port;

[0012] S3: Set the priority of Beidou short message communication to be higher than Ethernet communication to avoid conflicts between the two;

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

[0014] S5: Display the key data of the opposite side at the local power distribution station, including the circuit breaker position, A / B / C phase current, and zero-sequence current. At the same time, set the unlocking / locking knob to prevent misoperation.

[0015] S6: Before the reverse cutting device is activated, the charging conditions must be met, including the reverse cutting function is enabled, the communication with the opposite side is normal, the circuit breaker on this side is open, the circuit breaker on the opposite side is closed, the busbar and line are under pressure, and there is no PT disconnection;

[0016] S7: According to 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 expansion of faults;

[0017] S8: After the closing conditions such as voltage difference, angle difference, frequency difference, etc. 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.

[0018] Preferably, the Ethernet communication solution also includes a simplified configuration step, 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, port number are configured.

[0019] Preferably, when the firewall adopts dynamic address translation, one-to-one NAT translation needs to be enabled, and the port number used for reverse switching needs to be opened, and corresponding policies need to be added to enable the business to pass smoothly.

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

[0021] Preferably, 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.

[0022] Preferably, the charging conditions also include that the bus and line voltages and currents are within a set range to ensure smooth reverse switching operations.

[0023] Preferably, the set 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.

[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 cutting operation.

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

[0026] Preferably, after the reverse cutting action, both the local side and the opposite side generate action reports and recordings, and the recording frequency is 1200 Hz, so as to facilitate subsequent fault analysis and troubleshooting.

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

[0028] 1. The present invention performs uninterruptible power supply switching based on Ethernet and Beidou short message communication, and can perform information exchange and linkage between multiple distribution stations through automated devices, so as to realize uninterruptible power supply switching in a "first connect and then disconnect" manner, effectively improving the reliability and safety of uninterruptible power supply switching of the through-line self-closing line, ensuring the speed of fault isolation during the switching process, and improving the operation and inspection technology level.

[0029] 2. The present invention solves the problem of the influence of the reverse cutting mode on the existing equipment. The reverse cutting mode should not affect the conventional protection actions such as quick-break and overcurrent of the existing protection devices, and should not affect the normal opening and closing operations locally or remotely. The maximum load current should be avoided during reverse cutting and must be less than the quick-break and overcurrent action values ​​of the existing protection devices without causing the existing protection devices to malfunction, thereby achieving no influence on normal operation, accurate action in case of faults, and uninterrupted power supply during reverse cutting.

[0030] 3. The present invention solves the problem of information interaction and linkage between distribution stations on both sides: in view of the reverse cutting process of the through-closed line, a strategy for information interaction and discrimination of the through-closed line between distribution stations on both sides is studied, and a communication method is proposed which mainly utilizes the existing Ethernet channels of distribution stations on both sides and is supplemented by Beidou short message communication. Data transmission is realized through custom protocols, and relevant information of the distribution station on the opposite side can be seen at the distribution station on this side and linked to the distribution station on the opposite side.

[0031] 4. The present invention solves the problem of accurate judgment of the reverse cutting process: starting from the voltage, current, phase, angular difference, frequency, circuit breaker position and other conditions of the self-closing line passing through the distribution stations on both sides, accurately judge whether the closing operation conditions are met according to reasonable judgment logic, study the fault characteristics of the reverse cutting process, summarize the fault characteristics such as opening the loop, opening the loop, and human factors, and study how to quickly restore power supply in the event of a fault. Before closing the loop, a method of locking the reverse cutting when the opposite side is heavy load or the opposite side zero-sequence current is too large is proposed, and after closing the loop, a method of disconnecting the circuit breaker on this side when the current on this side is too large is proposed, thereby reducing the impact range in the event of a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic flow chart of the uninterruptible power supply reverse cutting method of the present invention;

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

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

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

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

[0037] The present invention adopts Ethernet communication as the main method and Beidou short message technology as the means of emergency communication to form a mass-produced through-self-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-self-closing line of the distribution stations on both sides, information interaction of the through-self-closing line of the distribution stations on both sides is achieved, 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 uninterruptible power supply switching of the through-self-closing line.

[0038] Embodiment 1

[0039] by Figure 2 As shown, substation 1 and substation 2 are two power supplies for the next level load, and substation 1 and substation 3 are two power supplies for other next level loads. Usually, substation 1, substation 2, and substation 3 are in different network segments. In the case of the same network segment, routing does not need to be configured, but routing needs to be configured in the case of cross-segment. If substation 1 and substation 2 are both private networks, they can communicate with each other. To avoid being affected by other devices in the channel, configure the local IP, port number, subnet mask, and gateway of substation 1 and the IP, port number, subnet mask, and network segment of substation 2. Configure the local IP, port number, subnet mask, and gateway of substation 2 and the IP, port number, subnet mask, and network segment of substation 1. In 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.

[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 communication front-end processor is added to the main station. The existing three-layer switch of the main station has been divided into different VLANs. Substation 1, substation 3, the newly added communication front-end processor, 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 processor. Due to the limitation of the number of addresses, the firewall has used dynamic address translation (both IP and port number 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 processor of 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 processor of the master station. The newly added communication front-end processor of 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 substation 1 and the IP, port number, subnet mask, and network segment of substation 2. At the same time, the newly added communication front-end processor of the master station needs to be configured with a rule to bind the communication between substation 1 and substation 3, so that the data can be transferred through the communication front-end processor. 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 processor rules can be configured to meet actual needs, and they will not interfere with or affect each other. It should be noted that because the firewall adopts one-to-one NAT address conversion, the switching device and the communication front-end processor need to configure the converted address (the port number remains unchanged) when configuring the relevant parameters on the opposite side.

[0041] When communication is established between the reverse cutting 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 reverse switching device are connected by RS232 serial port. The Beidou module sends a message every 1 minute. In order to avoid conflicts 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 reverse switching device includes power detection, communication application, IC card detection, feedback information, system self-test, etc. When the Beidou short message establishes communication, it can be viewed by logging in to the reverse switching device or the communication front-end through the debugging serial port.

[0043] 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. When the power is shut down normally, the operation and maintenance personnel operate the opening and closing knob locally or remotely control the opening and closing of the circuit breaker. The reverse cutting device only records the position change information and voltage and current information of the circuit breaker, and does not control the circuit. When the circuit fails and trips, the circuit breaker is tripped through the outlet of the existing protection device. The reverse cutting device only records the position change information and voltage and current information of the circuit breaker, and does not control the circuit. When power reverse cutting is required, the reverse cutting device is activated to achieve uninterrupted power supply reverse cutting.

[0044] like Figure 4 As shown, when the "current judgment enable" control word is turned on, the reverse cutting device on this side detects that the current on the opposite side is greater than the set current value, and reports the "opposite side heavy load" signal with a delay of 10s. When the current is restored, the signal returns with a delay of 1.25s, and the reverse cutting function is locked. This method is to avoid the expansion of the impact when the reverse cutting fails under heavy load conditions.

[0045] After the reverse cutting device on this side is started, the circuit breaker on this side will be automatically closed after the closing conditions such as pressure difference, angle difference, frequency difference, etc. are met within 70s, and the circuit breaker on the opposite side will be automatically opened after the closing parallel time delay. If it exceeds 70s, the reverse cutting process will be completed and no control command will be sent. Because a large current may be generated when the loop is closed, when the "overcurrent enable" control word is put into use, when it is detected that the current on this side is greater than the set current value, the circuit breaker on this side will be opened and the reverse cutting process will be completed. In order to avoid the situation where both circuit breakers are separated, the setting value of the closing parallel time must be greater than the setting value of the overcurrent time, and the setting value of the overcurrent setting must be greater than the maximum load current that can occur and less than the overcurrent setting value of the existing protection device, ultimately achieving normal operation without impact, accurate action in case of faults, and uninterrupted power supply during reverse cutting.

[0046] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

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 also needs to be configured 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 machine to the master station, and implement data intercommunication by configuring different VLANs and firewalls. Enable one-to-one NAT conversion in the firewall to ensure normal business communication; S2: 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 any obstruction. The Beidou module and the inverted cutting device are connected by 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 power status of the Beidou module on the reverse switching device interface to intuitively reflect the quality of the Beidou signal; S5: Display the key data of the opposite side at the local power distribution station, including the circuit breaker position, A / B / C phase current, and zero-sequence current. At the same time, set the unlocking / locking knob to prevent misoperation. S6: Before the reverse cutting device is activated, the charging conditions must be met, including the reverse cutting function is enabled, the communication with the opposite side is normal, the circuit breaker on this side is open, the circuit breaker on the opposite side is closed, the busbar and line are under pressure, and there is no PT disconnection; S7: According to 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 expansion of faults; S8: After the closing conditions such as voltage difference, angle difference, frequency difference, etc. 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, port number are 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 bus and line voltages and currents are within a set range to ensure smooth reverse switching operations.

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 is characterized in that: After the reverse cutting device is started, if the loop closing condition is not met within a set time, the reverse cutting operation is 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 is characterized in that: After the reverse cutting action, both the local side and the opposite side generate action reports and recordings, and the recording frequency is 1200 Hz, so as to facilitate subsequent fault analysis and troubleshooting.

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