Terminal load cross-regional non-inductive power supply switching system and control method

Abstract

The invention discloses a terminal load cross-regional non-inductive power supply switching system and a control method, and mainly relates to the technical field of load cross-regional non-inductive power supply. Comprising a main line, a first power station, a second power station, a first incoming line switch and a second incoming line switch, the main line is provided with a first branch wire and a second branch wire which are respectively connected with the first power station and the second power station, the first power station and the first branch wire are provided with first switches, and the second power station and the second branch wire are provided with second switches. The method has the beneficial effects that ultra-fast loop closing reverse load non-inductive switching can be realized, the power utilization experience of customers is not influenced, and the power supply reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cross-regional inductive power supply for loads, and in particular to a cross-regional inductive power supply switching system and a control method for terminal loads. Background Art

[0002] The 220kV system is operated in a ring network before partitioning, which ensures the consistency of frequency and phase angle of the 220kV system. The main power supply of the terminal 110kV / 35kV substation is the same system with only voltage amplitude difference. The system current is only exchanged in the 220kV system. When the terminal station performs non-stop power closing and load reversal, it will not cause uncontrollable low-voltage system current crossing, so non-inductive closing and power reversal can be achieved.

[0003] In order to control the power flow distribution of the 220kV system, it is sometimes necessary to operate the 220kV system in sections. After the section operation, due to the differences in the composition of the regional main power supply structure, there are certain frequency and phase differences in the 220kV systems in different areas. If the end 110kV / 35kV substations from different power supply areas are closed and reversed, it will inevitably cause unpredictable low-voltage system power flow crossing, resulting in overload of low-voltage components or overcurrent tripping of related protections, causing unnecessary tripping and power loss. If the reverse load method of closing the main power supply first and then closing the backup power supply is adopted, it will cause unnecessary power outages in the entire station, greatly reducing the reliability of power supply.

[0004] Therefore, there is an urgent need for a cross-regional inductive power supply switching system and control method for terminal loads under a 220kV system partition operation mode to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a terminal load cross-regional inductive power supply switching system and control method, which can realize ultra-fast loop-closing inductive switching of reverse loads without affecting the customer's power consumption experience and improving power supply reliability.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] On the one hand, a terminal load cross-regional inductive power supply switching system includes a main line, a first power station, a second power station, a first incoming line switch and a second incoming line switch. The main line is provided with a first branch wire and a second branch wire, which are respectively connected to the first power station and the second power station. A first switch is provided on the first power station and the first branch wire, and a second switch is provided on the second power station and the second branch wire.

[0008] Preferably, it is characterized in that a two-way communication line is arranged between the first incoming line switch and the second incoming line switch, and a switch status acquisition module, a data analysis and transmission module, a function forced exit module and a switch control module are connected in series in each direction of the two-way communication line.

[0009] Preferably, the switch status acquisition module is respectively connected to the first incoming line switch and the second incoming line switch, the switch status acquisition module is data connected to the data analysis and transmission module, the data analysis and transmission module is data connected to the function forced exit module, the function forced exit module is data connected to the switch control module, and the switch control module is respectively connected to the first incoming line switch and the second incoming line switch.

[0010] Preferably, a control method applied to the above-mentioned terminal load inter-regional inductive power supply switching system is characterized by comprising the following steps:

[0011] S1: The switch status acquisition module acquires the status of the first incoming line switch or the second incoming line switch and sends the status information to the data analysis and transmission module;

[0012] S2: The data analysis and transmission module sends the switch status information to the server and analyzes and processes the return value of the server;

[0013] S3: The data analysis and transmission module determines whether it is necessary to enter the function forced exit module;

[0014] S4: The state of the module is forced to exit by the function and the switch is controlled.

[0015] Preferably, the step S2 is specifically:

[0016] The data analysis and transmission module sends the switch status information to the server. When the server receives the need to switch the main power supply station, it sends the power supply station switching instruction to the data analysis and transmission module.

[0017] Preferably, the step S3 is specifically:

[0018] Determine whether the station switching power supply is completed. If the station switching operation is in progress, it is determined that there is no need to execute the function forced exit; if the station switching operation has been completed, it is determined that the function forced exit needs to be executed.

[0019] Preferably, the step S3 is specifically:

[0020] When it is determined that the first power station is closed and connected to the main line at the same time, the first incoming line switch is closed, so that the signal passes through the two-way communication line, and the switch control module of the second incoming line switch is triggered at the same time, so that the second incoming line switch is disconnected, and the second power station supplies power to the main line;

[0021] When it is determined that the second power station is closed and connected to the main line at the same time, the second incoming line switch is closed, so that the signal passes through the two-way communication line and triggers the switch control module of the first incoming line switch at the same time, so that the first incoming line switch is disconnected, completing the power supply of the first power station to the main line.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The closing-loop current crossing time is minimized (only the main supply switch opening time, which will not be greater than 80ms). The primary component is similar to bearing an external weak short-circuit current. Due to the ultra-short time, the protection set overcurrent time is not reached and the protection will not malfunction. Ultra-fast closing-loop reverse load inductive switching can be achieved without affecting the customer's power consumption experience and improving power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0025] Figure 2 is a schematic diagram of the auxiliary node structure of the present invention; Figure 3 It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0027] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0028] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0029] Example:

[0030] An in-depth analysis of the power flow problem of reverse load in the closed-loop power supply in different areas shows that the power supply lines of the 110kV / 35kV substation at the end all come from the 220kV substation. The maximum closed-loop current will not exceed the short-circuit current, and will not reach the fast-break setting value of the 110kV / 35kV substation line protection at the 220KV station end. The current stage II protection has a delay of at least 0.3s, and the overcurrent resistance of the components that the power flow passes through has an inverse time characteristic, that is, the allowable time for large currents is short.

[0031] like Figure 1 As shown, this embodiment provides a terminal load cross-regional inductive power supply switching system, including a main line, a first power station, a second power station, a first incoming line switch and a second incoming line switch, the main line is provided with a first branch wire and a second branch wire, respectively connecting the first power station and the second power station, the first power station and the first branch wire are provided with a first switch, the second power station and the second branch wire are provided with a second switch, in this embodiment, the first power station is Figure 1 Station A is shown, and the second power station is Figure 1 Station B in Figure 1 Station C is the terminus.

[0032] A bidirectional communication line is provided between the first incoming line switch and the second incoming line switch, and a switch state acquisition module, a data analysis and transmission module, a function forced exit module and a switch control module are connected in series in each direction of the bidirectional communication line, the switch state acquisition module is respectively connected with the first incoming line switch and the second incoming line switch, the switch state acquisition module is data-connected with the data analysis and transmission module, the data analysis and transmission module is data-connected with the function forced exit module, the function forced exit module is data-connected with the switch control module, and the switch control module is respectively connected with the first incoming line switch and the second incoming line switch.

[0033] like Figure 2 As shown, in this embodiment, the switch status acquisition module and the data analysis and transmission module are integrated into the switch auxiliary node. Two switch auxiliary nodes are provided, which are respectively located at the first incoming switch and the second incoming switch. The function forced exit module is integrated into the hard pressure plate of the first incoming switch and the second incoming switch control cabinet, and the switch control module is integrated into the opening control loop of the first incoming switch and the second incoming switch.

[0034] like Figure 3 As shown, this embodiment also provides a control method for a terminal load cross-regional inductive power supply switching system, comprising the following steps:

[0035] S1: The switch status acquisition module acquires the status of the first incoming line switch or the second incoming line switch and sends the status information to the data analysis and transmission module;

[0036] S2: The data analysis and transmission module sends the switch status information to the server and analyzes and processes the return value of the server;

[0037] S3: The data analysis and transmission module determines whether it is necessary to enter the function forced exit module;

[0038] S4: The state of the module is forced to exit by the function and the switch is controlled.

[0039] The data analysis and transmission module sends the switch status information to the server. When the server receives the need to switch the main power supply station, it sends the power supply station switching instruction to the data analysis and transmission module.

[0040] The data processing module analyzes the switching power supply station instruction, including:

[0041] Connect the first power station to the main line while disconnecting the second power station;

[0042] Connect the second power station to the main line and disconnect the first power station.

[0043] When it is determined that the first power station is connected to the main line and the second power station is disconnected at the same time, the closing and opening of the first incoming line switch and the second incoming line switch control cabinet are put into operation. The auxiliary node of the first incoming line switch transmits the positive power of the control power supply to the opening control circuit of the second switch through the loop, so that the first switch is closed and the second switch is disconnected at the same time, completing the power supply of the first power station to the main line;

[0044] When it is determined that the second power station is connected to the main line and the first power station is disconnected at the same time, the hard pressure plates of the first incoming line switch and the second incoming line switch control cabinet are put into operation, and the second incoming line switch auxiliary node transmits the positive power of the control power supply through the loop to the opening control loop of the second switch, so that the first switch is closed and disconnected at the same time, completing the power supply of the second power station to the main line.

[0045] Through the above improvement of the operating circuit of the two incoming switches of the terminal 110kV / 35kV substation, the standby incoming switch is closed first, and then the mechanical closing position (conducting only when it reaches the closing position) contact of the switch is used to drive the original main supply switch to automatically trip, that is, the closing contact of the standby switch is connected to the manual opening operation circuit of the main supply switch, and the main supply switch is automatically tripped by closing the standby switch (the overcurrent protection of the original main supply incoming switch can be temporarily changed to a set value as a backup closing loop automatic tripping), so that the closing loop current crossing time is minimized (only the opening time of the main supply switch, which will not exceed 80ms). The primary element is similar to having received an external weak short-circuit current. Due to the ultra-short time, the protection set overcurrent time is not reached, and the protection will not malfunction. The best thing is that ultra-fast closing loop reverse load inductive switching can be achieved, which does not affect the customer's electricity experience and improves the power supply reliability.

[0046] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A terminal load cross-regional inductive power supply switching system, characterized in that: It includes a main line, a first power station, a second power station, a first incoming line switch and a second incoming line switch. The main line is provided with a first branch wire and a second branch wire, which are respectively connected to the first power station and the second power station. The first power station and the first branch wire are provided with a first switch, and the second power station and the second branch wire are provided with a second switch.

2. According to claim 1, a terminal load cross-regional inductive power supply switching system is characterized in that: A bidirectional communication line is provided between the first incoming line switch and the second incoming line switch, and a switch state acquisition module, a data analysis and transmission module, a function forced exit module and a switch control module are connected in series in each direction of the bidirectional communication line.

3. According to claim 1, a terminal load cross-regional inductive power supply switching system is characterized in that: The switch status acquisition module is respectively connected to the first incoming line switch and the second incoming line switch, the switch status acquisition module is data-connected to the data analysis and transmission module, the data analysis and transmission module is data-connected to the function forced exit module, the function forced exit module is data-connected to the switch control module, and the switch control module is respectively connected to the first incoming line switch and the second incoming line switch.

4. A control method for the terminal load inter-regional inductive power supply switching system as claimed in claim 3, characterized in that: The following steps are involved: S1: The switch status acquisition module acquires the status of the first incoming line switch or the second incoming line switch and sends the status information to the data analysis and transmission module; S2: The data analysis and transmission module sends the switch status information to the server and analyzes and processes the return value of the server; S3: The data analysis and transmission module determines whether it is necessary to enter the function forced exit module; S4: The state of the module is forced to exit by the function and the switch is controlled.

5. A control method according to claim 4, characterized in that: The step S2 is specifically as follows: The data analysis and transmission module sends the switch status information to the server. When the server receives the need to switch the main power supply station, it sends the power supply station switching instruction to the data analysis and transmission module.

6. A control method according to claim 5, characterized in that: The step S3 is specifically as follows: Determine whether the station switching power supply is completed. If the station switching operation is in progress, it is determined that there is no need to execute the function forced exit; if the station switching operation has been completed, it is determined that the function forced exit needs to be executed.

7. A control method according to claim 6, characterized in that: The step S3 is specifically as follows: When it is determined that the first power station is closed and connected to the main line at the same time, the first incoming line switch is closed, so that the signal passes through the two-way communication line, and the switch control module of the second incoming line switch is triggered at the same time, so that the second incoming line switch is disconnected, and the first power station supplies power to the main line; When it is determined that the second power station is closed and connected to the main line at the same time, the second incoming line switch is closed, so that the signal passes through the two-way communication line, and at the same time triggers the switch control module of the first incoming line switch, so that the first incoming line switch is disconnected, completing the power supply of the second power station to the main line.

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