A string supply standby self-switching device

Abstract

The present invention discloses a series-connected backup power supply device, comprising: at least three channels and function pressure plates corresponding to the at least three channels one by one; the at least three channels are respectively in communication connection with other series-connected backup power supply devices arranged at different sites, and the function pressure plate corresponding to each channel is used to control the connection on-off of the corresponding channel. Only two of the at least three channels are in a connected state at the same time, and the two connected channels and the other series-connected backup power supply devices they are connected to form a series connection. The series-connected backup power supply device disclosed in the embodiments of the present invention can re-group strings as needed, reducing the risk of substation voltage loss.

Description

Technical Field

[0001] The embodiment of the present invention relates to power grid technology, and particularly to a series-connected backup power supply automatic switching device. Background Art

[0002] A backup power supply automatic switching device is a device that can quickly and automatically switch the backup power supply to work or switch the user to the backup power supply when the working power supply trips due to a fault, so that the user will not be powered off for a long time, which is abbreviated as a backup power supply automatic switching device.

[0003] According to whether the backup power supply automatic switching device operates independently at a single station or coordinates the operation of remote backup power supply automatic switching devices among multiple stations, it can be divided into local backup power supply automatic switching and remote backup power supply automatic switching. To enable multiple series-connected substations to restore power supply from another power supply when one power supply fails, generally, remote backup power supply automatic switching devices with communication functions are configured at each series-connected substation. The remote backup power supply automatic switching devices configured at multiple series-connected substations form a series-connected backup power supply automatic switching, and each backup power supply automatic switching device therein is called a series-connected backup power supply automatic switching device. The series-connected backup power supply automatic switching device is configured with two channels, which are respectively connected to other series-connected backup power supply automatic switching devices on both sides of the series-connected backup power supply automatic switching. The series-connected backup power supply automatic switching device realizes the coordinated operation of the whole string through the interaction of the information of these channels, and solves the problem that when the upper-level voltage is lost, only the open-loop point station equipped with the local backup power supply automatic switching can restore power supply.

[0004] However, the current series-connected backup power supply automatic switching device can only be set on a serially connected substation line. In the case of a branched site, in principle, only the relatively more important site can be fixedly selected as a site in the serial connection. Then, when the power grid structure needs to be adjusted and the string needs to be reorganized, due to the fixed channels of the series-connected backup power supply automatic switching device, it cannot be flexibly adjusted and cannot adapt to the adjusted power grid. Summary of the Invention

[0005] The present invention provides a series-connected backup power supply automatic switching device, which can reorganize the string according to needs and reduce the risk of substation voltage loss.

[0006] In a first aspect, an embodiment of the present invention provides a series-connected backup power supply automatic switching device, including: at least three channels and function switches corresponding to the at least three channels one by one;

[0007] The at least three channels respectively establish communication connections with other series-connected backup power supply automatic switching devices arranged at different sites. The function switch corresponding to each channel is used to control the connection on and off of the corresponding channel. Only two of the at least three channels are in a connected state at the same time. The two connected channels and the other series-connected backup power supply automatic switching devices they are connected to form a series-connected connection.

[0008] In a possible implementation manner of the first aspect, each function switch controls the connection state of the corresponding channel according to the working state of the line connected by the corresponding channel.

[0009] In a possible implementation of the first aspect, when the line connected to the first channel in at least three channels that is in a connected state is abnormal, the function pressure plate corresponding to the first channel controls the first channel to disconnect, and the function pressure plate corresponding to the second channel that is in a disconnected state and has a normal connected line in the at least three channels controls the second channel to connect.

[0010] In a possible implementation of the first aspect, each channel and the connected line have associated configuration setting values. The associated configuration setting values are the addresses of other series power supply backup automatic switching devices on the opposite side of the line connected by each channel. The other series power supply backup automatic switching devices and the series power supply backup automatic switching devices on the opposite side of the line connected by each channel respectively have corresponding channel address setting values.

[0011] In a possible implementation of the first aspect, when the line connected to the first channel in at least three channels that is in a connected state is abnormal, the function pressure plate is set to the withdrawn state.

[0012] In a possible implementation of the first aspect, the abnormality of the line connected to the first channel in the connected state includes: power outage, maintenance or failure of the line connected to the first channel in the connected state.

[0013] In a possible implementation of the first aspect, the channel corresponding to each function pressure plate is in a connected state when the function pressure plate is in the inserted state, and the channel corresponding to each function pressure plate is in a disconnected state when the function pressure plate is in the withdrawn state.

[0014] In a possible implementation of the first aspect, when each function pressure plate is in the inserted state, all channels are invalid, cannot be grouped into strings, and an alarm message is issued.

[0015] In a possible implementation of the first aspect, when each function pressure plate is in the withdrawn state, all channels are invalid, cannot be grouped into strings, and an alarm message is issued.

[0016] In a possible implementation of the first aspect, the at least three channels are three channels.

[0017] The series power supply backup automatic switching device provided by the embodiment of the present invention includes: at least three channels and function pressure plates corresponding to the at least three channels one by one. The at least three channels respectively establish communication connections with other series power supply backup automatic switching devices arranged at different stations. The function pressure plate corresponding to each channel is used to control the connection and disconnection of the corresponding channel. Only two channels in the at least three channels are simultaneously in a connected state. The two channels in the connected state and the other series power supply backup automatic switching devices they are connected to form a series power supply connection. Since there are at least three channels that have established communication connections with other series power supply backup automatic switching devices, the strings can be re-grouped as needed to meet various operation modes and reduce the risk of voltage loss in the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the application scenario of a traditional series-connected backup power supply automatic switching device;

[0019] Figure 2 It is a schematic diagram of the structure of a series-connected backup power supply automatic switching device provided by an embodiment of the present invention;

[0020] Figure 3 It is a flowchart of the application of a series-connected backup power supply automatic switching device provided by an embodiment of the present invention. Detailed implementation manners

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only parts related to the present invention rather than all structures are shown in the drawings for the convenience of description.

[0022] Figure 1 It is a schematic diagram of the application scenario of a traditional series-connected backup power supply automatic switching device. Multiple substations are shown in the figure, namely 110 kV Substation A, 110 kV Substation B, 110 kV Substation C, 110 kV Substation D, 220 kV Substation J, 220 kV Substation M, and 220 kV Substation K. Substation A, Substation B, and Substation C are connected in series for operation. Series-connected backup power supply automatic switching devices are respectively deployed at four 110 kV sites of 110 kV Substation A, 110 kV Substation B, 110 kV Substation C, and 110 kV Substation D, namely series-connected backup power supply automatic switching device 11, series-connected backup power supply automatic switching device 12, series-connected backup power supply automatic switching device 13, and series-connected backup power supply automatic switching device 14. Each series-connected backup power supply automatic switching device has two channels, establishes a communication connection with adjacent sites, and obtains the line status of adjacent sites.

[0023] Since the traditional series-connected backup power supply automatic switching device can only operate in a single series, when the BC line (the line between Substation B and Substation C) or the CK line (the line between Substation C and Substation K) is powered off or under maintenance, since Substation B is equipped with the series-connected backup power supply automatic switching device 12, and Substation A, Substation B, and Substation C are connected in series for operation, the series-connected backup power supply automatic switching device 12 can only consider the series operation of Substation A and Substation B and cannot form a new series with Substation D. Then, if the MD line (the line between Substation M and Substation D) fails, Substation D will have the risk of voltage loss. Although Substation D is equipped with the series-connected backup power supply automatic switching device 14, due to no series formation, it will not be able to restore power supply through other sites.

[0024] Figure 2 It is a schematic diagram of the structure of a series-connected backup power supply automatic switching device provided by an embodiment of the present invention. As Figure 2 shown, the structure of the series-connected backup power supply automatic switching device provided in this embodiment includes:

[0025] The series-connected backup power supply self-switching device provided by the embodiment of the present invention is configured in a substation. After being connected in series with the series-connected backup power supply self-switching devices configured in other substations, it provides a backup power supply for the substation after series connection. The series-connected backup power supply self-switching device 21 provided by the embodiment of the present invention includes a first channel 22, a second channel 23, a third channel 24, a first function pressing plate 25, a second function pressing plate 26, and a third function pressing plate 27. Among them, the first channel 22 corresponds to the first function pressing plate 25, the second channel 23 corresponds to the second function pressing plate 26, and the third channel 24 corresponds to the first function pressing plate 27. Each function pressing plate is respectively used to control the connection on and off of the corresponding channel.

[0026] Figure 2 Taking three channels and three corresponding function pressing plates as an example for illustration, but the series-connected backup power supply self-switching device provided by the embodiment of the present invention is not limited thereto. The channels can be three or more than three, and each channel has a corresponding function pressing plate.

[0027] The first channel 22, the second channel 23, and the third channel 24 respectively establish communication connections with other series-connected backup power supply self-switching devices arranged at different sites. As Figure 2 shown, the first channel 22 establishes a communication connection with the series-connected backup power supply self-switching device 31, the second channel 23 establishes a communication connection with the series-connected backup power supply self-switching device 32, and the third channel 24 establishes a communication connection with the series-connected backup power supply self-switching device 33. In this way, for the series-connected backup power supply self-switching device 21, communication connections are established with three series-connected backup power supply self-switching devices, namely the series-connected backup power supply self-switching device 31, the series-connected backup power supply self-switching device 32, and the series-connected backup power supply self-switching device 33. Then, the series-connected backup power supply self-switching device 21 can determine the connection status of the lines connected by each channel through the function pressing plates corresponding to each channel. The series-connected backup power supply self-switching device 21, the series-connected backup power supply self-switching device 31, the series-connected backup power supply self-switching device 32, and the series-connected backup power supply self-switching device 33 are respectively arranged at different sites (substations), where the series-connected backup power supply self-switching device 21 is arranged at the 110 kV Substation B, the series-connected backup power supply self-switching device 31 is arranged at the 110 kV Substation A, the series-connected backup power supply self-switching device 32 is arranged at the 110 kV Substation C, and the series-connected backup power supply self-switching device 33 is arranged at the 110 kV Substation D.

[0028] Although the series-connected backup power supply self-switching device 21 has established communication connections with three series-connected backup power supply self-switching devices through three channels respectively, since the series-connected backup power supply self-switching devices can only form a serial connection, as Figure 1As shown, for the series power supply backup automatic switching device 21, among its three channels, only two channels can be in the connected state simultaneously, and the other channel can only be in the disconnected state. For example, if the first channel 22 and the second channel 23 are in the connected state, then the series power supply backup automatic switching devices 31, 21, and 32 form a string. Or if the second channel 23 and the third channel 24 are in the connected state, then the series power supply backup automatic switching devices 32, 21, and 33 form a string. Then when the lines between the stations corresponding to each series power supply backup automatic switching device in the string are powered off due to faults or for maintenance, the series power supply backup automatic switching device can replace the string with a line that has not failed.

[0029] For example, the series power supply backup automatic switching devices 31, 21, and 32 form a string. When the BC line (the line between station B and station C) or the CK line (the line between station C and station K) is powered off or under maintenance (this example corresponds to the previous one), the series power supply backup automatic switching device 21 can replace the string with the string formed by the series power supply backup automatic switching devices 31, 21, and 33. In this way, if Figure 1 In the embodiment shown, when the BC line (the line between station B and station C) or the CK line (the line between station C and station K) is powered off or under maintenance, when the MD line fails, the series power supply backup automatic switching can prevent the voltage loss at station D.

[0030] That is to say, the series power supply backup automatic switching device provided by the embodiment of the present invention has three channels and can establish communication connections with three other series power supply backup automatic switching devices respectively. Although only two channels are in the connected state simultaneously, the string connection method of maintaining the series power supply is the same as that of the traditional series power supply backup automatic switching device. However, any two of the three channels can be in the connected state simultaneously. The connection states of the channels are controlled by the function pressure plates corresponding to each channel, and the string can be flexibly realized according to needs to meet the various operation requirements of the substation and reduce the risk of voltage loss in the substation.

[0031] Among them, the function pressure plates corresponding to each channel can be soft pressure plates or hard pressure plates. The hard pressure plate is a hardware device set in the series power supply backup automatic switching device and is used to control the on / off of the connection of the corresponding channel. The soft pressure plate is a function realized by the software system in the series power supply backup automatic switching device and is used to control the on / off of the connection of the corresponding channel through software.

[0032] It should be noted that Figure 2Taking the series-connected spare power supply equipment with three channels as an example, when the series-connected spare power supply equipment includes more than three channels, each channel is also respectively connected to the series-connected spare power supply equipment set at different stations to establish a communication connection, but only two channels are in the connected state at the same time. Then when a power outage occurs in the line connected by any one channel of the series-connected spare power supply equipment, any two channels with normal connected lines can be set to the connected state, so as to ensure the normal operation of the string and reduce the risk of voltage loss in the substation.

[0033] Each function pressure plate can control the connection state of the corresponding channel according to the working state of the line connected by the corresponding channel. Since the series-connected spare power supply equipment 21 has established a communication connection with other series-connected spare power supply equipment set at different stations through each channel, the function pressure plates corresponding to each channel can obtain the working state of the lines at the stations where other series-connected spare power supply equipment is located through the communication connection. Therefore, each function pressure plate can control the connection state of the corresponding channel according to the working state of the line connected by the corresponding channel. When the working state of the line connected by the channel corresponding to the function pressure plate is abnormal, the connection state of the corresponding channel is controlled to be disconnected.

[0034] For example, when the line connected by the first channel 22 in the connected state, that is, the line between station B and station A, is abnormal, the first function pressure plate 25 corresponding to the first channel 22 controls the first channel 22 to disconnect. The third function pressure plate 26 corresponding to the third channel 24 in the disconnected state and with a normal connected line controls the third channel 26 to connect.

[0035] The series-connected spare power supply equipment provided by the embodiment of the present invention includes: at least three channels and function pressure plates corresponding to the at least three channels one by one. The at least three channels are respectively connected to other series-connected spare power supply equipment set at different stations to establish a communication connection. The function pressure plate corresponding to each channel is used to control the connection and disconnection of the corresponding channel. Only two of the at least three channels are in the connected state at the same time. The two channels in the connected state and the other series-connected spare power supply equipment they are connected to form a series connection. Since there are at least three channels that have established a communication connection with other series-connected spare power supply equipment, the string can be reorganized according to needs, meeting various operation modes and reducing the risk of voltage loss in the substation.

[0036] To achieve channel switching for three or more series-connected backup power supply devices, fixed values can be associated and configured for each channel and the connected line. The associated configured fixed value is the address of other series-connected backup power supply devices on the opposite side of the line connected to each channel. Taking the series-connected backup power supply device with three channels as an example, the series-connected backup power supply device has 4-channel address fixed values, which are the local station address and the addresses of 3 stations on the opposite side corresponding to the three channels. When connecting to the opposite side station, the address of the corresponding side station is set to the address of the opposite side station. When the local station address is the same as the opposite side station address, the communication is normal; otherwise, the communication is abnormal and the two stations cannot form a series connection.

[0037] Taking station B as an example, as shown in Table 1 and Table 2, where Table 1 is the table of associated configured fixed values for channels and lines, and Table 2 is the table of channel and channel address fixed values. In Table 1 and Table 2, Figure 2 the series-connected backup power supply device 21 with three channels shown is taken as an example.

[0038] Table 1

[0039] Line AB Line BC Line BD Associated channel First channel 22 Second channel 23 Third channel 24

[0040] Table 2

[0041]

[0042] In Table 1, line AB represents the line between station A and station B, line BC represents the line between station B and station C, and line BD represents the line between station B and station D. Only part of the corresponding relationship between lines and associated channels is shown in Table 1.

[0043] In Table 2, the actual channel addresses are the addresses of each series-connected backup power supply device. Among them, the address of the series-connected backup power supply device 21 is 2, the address of the series-connected backup power supply device 31 is 1, the address of the series-connected backup power supply device 32 is 3, and the address of the series-connected backup power supply device 33 is 4.

[0044] Through the table of associated configured fixed values for channels and lines and the table of channel and channel address fixed values shown in Table 1 and Table 2, when an abnormality such as a power outage occurs in the corresponding line, the channel corresponding to the abnormal line can be determined through the corresponding relationship between the line and the channel, and the connection on and off of each channel can be determined through the corresponding relationship between the channel and the channel address and the switching of the corresponding channel function pressure plate (that is, when the channel addresses of the backup power supply devices on both sides are the same and the corresponding function pressure plates on both sides are put in, the channel is connected; otherwise, the channel is interrupted).

[0045] When the line connected to the first channel 22 in a connected state among at least three channels is abnormal, the function pressure plate can be set to the off state, or the channel address fixed value corresponding to other series-connected backup power supply devices on the opposite side of the line connected to the first channel 22 can be set to 0.

[0046] The line connected by the channel in the connected state is abnormal, which may include various situations such as power outage, maintenance or fault of the line connected by the channel in the connected state.

[0047] Each function pressure plate can have two states: inserted and withdrawn. When the function pressure plate is in the inserted state, the channel corresponding to the function pressure plate is in the connected state. When the function pressure plate is in the withdrawn state, the channel corresponding to the function pressure plate is in the disconnected state.

[0048] To avoid the abnormality of the string formed by the series power supply and backup automatic switching devices, when each function pressure plate of a series power supply and backup automatic switching device is in the inserted state, all channels are invalid, and no string can be formed, and an alarm message is sent. It can also be that the connection state of the channels corresponding to the function pressure plates is not changed, that is, no more than two channels can be in the connected state at the same time.

[0049] Similarly, to avoid the abnormality of the string formed by the series power supply and backup automatic switching devices, when each function pressure plate of a series power supply and backup automatic switching device is in the withdrawn state, all channels are invalid, and no string can be formed, and an alarm message is sent. It can also be that the connection state of the channels corresponding to the function pressure plates is not changed, that is, no channel can be in the disconnected state at the same time.

[0050] It should be noted that the above function pressure plates are channel function pressure plates or pressure plates for controlling the channel function.

[0051] Figure 3 The application flow chart of a series power supply and backup automatic switching device provided by an embodiment of the present invention is as Figure 3 shown. In the series power supply and backup automatic switching device 21 including three channels as Figure 2 shown, the third channel 24 is an alternative channel. That is, in the normal mode, the third channel 24 is withdrawn, and the first channel 22 and the second channel 23 of the normal channels operate in series. The first channel 22 of the series power supply and backup automatic switching device 21 is used to communicate with the series power supply and backup automatic switching device 31, and the second channel 23 is used to communicate with the series power supply and backup automatic switching device 32. When any line connected to the first channel 22 or the first channel 23 is under maintenance, the third channel 24 is inserted to replace the channel under maintenance to form a new string. When all three channels are inserted at the same time, an alarm prompt is given.

[0052] Among them, when the AJ line or the AB line is under maintenance, the first channel 22 is withdrawn, and the second channel 23 and the third channel 24 are inserted. The second channel 23 and the third channel 24 are effective. The third channel 24 of the series power supply and backup automatic switching device 21 is used to communicate with the series power supply and backup automatic switching device 33, and the second channel 23 is used to communicate with the series power supply and backup automatic switching device 32. The series power supply and backup automatic switching device groups corresponding to stations D, B, and C operate in series.

[0053] When the CK line or BC line is powered off, the second channel 23 is withdrawn, the first channel 22 and the third channel 24 are put into operation, the first channel 22 and the third channel 24 are effective. The first channel 22 of the series power supply backup automatic switching device 21 is used to communicate with the series power supply backup automatic switching device 31, and the third channel 24 is used to communicate with the series power supply backup automatic switching device 33. The series power supply backup automatic switching device groups corresponding to Station A, Station B, and Station D are operated in series.

[0054] When the DM line or BD line is under maintenance, the third channel 24 is withdrawn, the first channel 22 and the second channel 23 are put into operation, the first channel 22 and the second channel 23 are effective. The first channel 22 of the series power supply backup automatic switching device 21 is used to communicate with the series power supply backup automatic switching device 31, and the second channel 23 is used to communicate with the series power supply backup automatic switching device 32. The series power supply backup automatic switching device groups corresponding to Station A, Station B, and Station C are operated in series.

[0055] Wherein the XY line represents the line connecting between Station X and Station Y.

[0056] Note that the above is only the preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A string supply backup automatic switching device, characterized in that, it includes: At least three channels and function pressure plates corresponding one by one to the at least three channels; The at least three channels are respectively connected to other string supply backup automatic switching devices arranged at different stations to establish communication connections. The function pressure plate corresponding to each channel is used to control the connection on and off of the corresponding channel. Only two of the at least three channels are in the connected state at the same time. The two connected channels and the other string supply backup automatic switching devices they are connected to form a string supply connection; When a power outage occurs in the line connected by any one of the channels of the string supply backup automatic switching device, any two channels with normal connected lines are set to the connected state; Each function pressure plate controls the connection state of the corresponding channel according to the working state of the line connected by the corresponding channel; When the line connected by the first channel in the connected state among the at least three channels is abnormal, the function pressure plate corresponding to the first channel controls the first channel to disconnect. The function pressure plate corresponding to the second channel in the disconnected state and with a normal connected line among the at least three channels controls the second channel to connect; Each channel and the connected line have associated configuration setting values, and the associated configuration setting values are the addresses of other string supply backup automatic switching devices on the opposite side of the line connected by each channel; According to the associated configuration setting value table, when a power outage anomaly occurs in the corresponding line, the channel corresponding to the abnormal line is determined through the corresponding line-channel association relationship, and the connection on and off of each channel is determined through the corresponding relationship between the channel and the channel address and the input and withdrawal of the corresponding channel function pressure plate.

2. The string supply backup automatic switching device according to claim 1, characterized in that, When the line connected by the first channel in the connected state among the at least three channels is abnormal, the function pressure plate of the first channel is set to the withdrawn state.

3. The string supply backup automatic switching device according to any one of claims 1 to 2, characterized in that, The abnormality of the line connected by the first channel in the connected state includes: power outage, maintenance or fault of the line connected by the first channel in the connected state.

4. The string supply backup automatic switching device according to any one of claims 1 to 2, characterized in that, The channel corresponding to each function pressure plate in the input state is in the connected state, and the channel corresponding to each function pressure plate in the withdrawn state is in the disconnected state.

5. The string supply backup automatic switching device according to claim 4, characterized in that, When each function pressure plate is in the input state, all channels are invalid, cannot form a string, and an alarm message is sent.

6. The string supply backup automatic switching device according to claim 4, characterized in that, When each function pressure plate is in the withdrawn state, all channels are invalid, cannot form a string, and an alarm message is sent.

7. The string supply backup automatic switching device according to any one of claims 1 to 2, characterized in that, The at least three channels are three channels.

Images