Electrical load uninterrupted switching system and power transmission system

Abstract

The embodiment of the utility model discloses an electrical load uninterruptible switching system and a power transmission system, belongs to the technical field of electric power, and can realize uninterruptible power supply switching of an electrical load end of a power transmission bus in a cross-boundary area among different power supply areas. The system comprises a power transmission switch unit which is connected with a first high-voltage main bus and a second high-voltage main bus and is also connected with an electrical load end; the high-voltage bypass unit is connected with the first high-voltage main bus and the second high-voltage main bus and is used for charging through at least one of the first high-voltage main bus and the second high-voltage main bus; and the change-over switch unit is connected with the high-voltage bypass unit and is also connected with the electrical load end.

Description

Technical Field

[0001] This document relates to the field of power technology, and particularly to an electrical load uninterrupted switching system and a power transmission system. Background Art

[0002] With the development of regional cooperation and the construction of power infrastructure, in the area near the regional boundary between different power supply regions, power supply cooperation activities are carried out, enabling the power systems of different power supply regions to support each other and jointly ensuring the demand for the stability of electricity consumption for production and life in the area near the boundary between different power supply regions, which has become increasingly important.

[0003] At present, the power system usually transmits power to the power consumption load end of the power supply area it is responsible for through the high-voltage main bus. The main bus is usually equipped with a perfect plan for maintenance, repair and other tasks, and planned power outages are required for the power supply area. The power infrastructure in the area near the regional boundary (remote) between different power supply regions is usually relatively weak, and the construction of regional self-provided redundant lines is less. Planned power outages cause long-term operation interruptions to the power consumption equipment for production and life in the power supply area, and are likely to cause large regional economic losses. Summary of the Invention

[0004] The purpose of the embodiments of this specification is to provide an electrical load uninterrupted switching system and a power transmission system, which avoid the power supply interruption in remote power supply areas due to planned power outages for maintenance and repair tasks, etc., and thus realize the uninterrupted switching of the power consumption load end of the cross-regional transmission bus between different power supply regions, improving the stability and reliability of the power transmission system.

[0005] To achieve the above purpose, the embodiments of this specification adopt the following solutions:

[0006] In the first aspect, an electrical load uninterrupted switching system is provided, including:

[0007] A transmission switch unit, connected to the first high-voltage main bus and the second high-voltage main bus and also connected to the power consumption load end, for connecting the first high-voltage main bus or the second high-voltage main bus to the power consumption load end for main bus power transmission. Both the first high-voltage main bus and the second high-voltage main bus pass through the preset position area between different power supply regions and are the high-voltage main buses of the power systems of different power supply regions;

[0008] A high-voltage bypass unit, connected to the first high-voltage main bus and the second high-voltage main bus, for charging through at least one of the first high-voltage main bus and the second high-voltage main bus;

[0009] A switching switch unit, connected to the high-voltage bypass unit and also to the power consumption load end, is configured to connect the high-voltage bypass unit to the power consumption load end before the first high-voltage main bus or the second high-voltage main bus interrupts the main bus power transmission to the power consumption load end, so as to perform power transmission during the interruption of the main bus power transmission;

[0010] Wherein, the power transmission switch unit is further configured to disconnect the connection between one of the first high-voltage main bus and the second high-voltage main bus that interrupts power transmission and the power consumption load end after the high-voltage bypass bus in the high-voltage bypass unit is connected to the power consumption load end, and connect the other main bus to the power consumption load end to resume the main bus power transmission.

[0011] In a second aspect, a power transmission system is provided, including:

[0012] A first high-voltage main bus, which is the high-voltage main bus of the first power system;

[0013] The aforementioned electrical load uninterruptible switching system, connected to the first high-voltage main bus and the second high-voltage main bus and also to the power consumption load end, is configured to disconnect the connection between one of the first high-voltage main bus and the second high-voltage main bus and the power consumption load end, and connect the other main bus to the power consumption load end to perform power transmission;

[0014] Wherein, the second high-voltage main bus is the high-voltage main bus of the second power system, the first power system and the second power system belong to different power supply areas, and both the first high-voltage main bus and the second high-voltage main bus pass through a preset position area between different power supply areas.

[0015] In the solution of the embodiments of the present specification, the high-voltage bypass unit cooperates with the power transmission switch unit and the switching switch unit, so that the high-voltage bypass unit obtains the electric energy provided by the high-voltage main bus for charging, and after the power transmission switch unit triggers the interruption of the main bus power transmission, the high-voltage bypass unit continuously supplies power to the power consumption load end, and it can also realize the switching of the high-voltage main bus in the power supply area where maintenance and repair tasks need to be performed to the high-voltage main bus in the power supply area that has not been interrupted within the preset position area, and can also realize the switching back of the high-voltage main bus in the power supply area that has not been interrupted within the preset position area to the high-voltage main bus in the power supply area that has completed the tasks. This switching system ensures the power supply to the power consumption load end during the entire electrical connection switching process.

[0016] Other features and advantages of the embodiments of the present specification will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings described herein are used to provide a further understanding of the present specification and form a part of the present specification. The present disclosure is illustrated by way of example and not limitation in the accompanying drawings, and in particular should not constitute the only limitation and inappropriate limitation of the present specification. In the drawings:

[0018] Figure 1 It is a schematic diagram of the main modules of an exemplary electrical load uninterrupted switching system according to an embodiment of the present specification;

[0019] Figure 2 It is a schematic diagram of the main modules of a preferred electrical load uninterrupted switching system according to an embodiment of the present specification;

[0020] Figure 3 It is a schematic diagram of the steps of a switching method for an exemplary electrical load uninterrupted switching system according to an embodiment of the present specification;

[0021] Figure 4 It is a schematic diagram of an uninterrupted power transmission architecture within a preset position area according to an embodiment of the present specification. Detailed implementation manners

[0022] To make the purpose, technical solutions and advantages of the present specification clearer, the technical solutions of the present specification will be clearly and completely described below in conjunction with specific embodiments of the present specification and the corresponding drawings. It can be understood that the described embodiments are only a part of the embodiments of the present specification, rather than all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by any modification, equivalent replacement, improvement, etc. made by those of ordinary skill in the art without departing from the present disclosure shall fall within the scope of protection of this document.

[0023] As described above, the power infrastructure in the area near the boundary between different power supply regions is relatively weak. Usually, there may be only one main bus in each power supply region in the area near the boundary. Therefore, when maintenance and repair are carried out in each power supply region, planned power outages will be required. In the present specification, the nearby area with a distance less than a preset distance from the regional boundary can be selected as the area near the boundary between different power supply regions, or the position areas of different power supply regions on both sides of the regional boundary can be divided into the same area near the boundary, which can both be referred to as the cross-border area, that is, the preset position area between different power supply regions, where the intersection of different power supply regions can be only the regional (inter-regional) boundary, and the preset position area includes a section of the regional boundary.

[0024] The preset location area may include location areas of at least two different power supply regions, and there is at least one high-voltage main bus passing through the location area of each power supply region (belonging to the preset location area). By way of example, Country A and Country B are adjacent. When conducting power supply cooperation, a specified area near the national border can be designated as the preset location area. This preset location area includes both the location area of the power supply region in Country A and the location area of the power supply region in Country B. Moreover, there is at least one high-voltage main bus passing through the preset location area in the location area of the power supply region in Country A, and there is also at least one high-voltage main bus passing through the preset location area in the location area of the power supply region in Country B. The power supply parameters (such as voltage, frequency, etc.) of the high-voltage main buses between the two countries can be different or the same, and can be allocated, managed, and billed by the power systems corresponding to their respective high-voltage main buses. It can be understood that the preset location area between power supply regions under other administrative regions or areas such as provinces / states can also be set up similarly with reference to this.

[0025] In order to achieve uninterrupted power transmission switching in the area near the border, an attempt can be made to set up a direct switching switch within the preset location area. However, high-voltage main buses are usually designed to withstand large power consumption loads. During the direct switching process, voltage fluctuations and inrush currents will be generated, which will cause damage to the equipment in the power grid and further lead to power supply interruption. Therefore, it is very difficult to solve the defect of power supply interruption caused by bus switching in the area near the border. An attempt can also be made to separately build auxiliary redundant transmission lines in the power supply region with planned power outages. However, the area near the border is often a remote area. The cost of rebuilding transmission lines and complete power supporting equipment separately in each power supply region is difficult to bear. Moreover, compared with the main buses in each region, the utilization rate of redundant transmission lines is very low. The cost of applying redundant transmission lines and complete power supporting equipment to the aforementioned preset location area is difficult to accept, and it is very difficult to solve the defect of power supply interruption caused by bus switching in the remote area near the border.

[0026] In addition, in the switching scheme of the uninterruptible power supply, it is also possible to try to directly install an uninterruptible power supply in the power station within a power supply area. When maintenance and repair tasks need to be carried out in this power supply area, the high-voltage main bus of this power supply area is switched to the line equipped with a transformer and an uninterruptible power supply, and the uninterruptible power supply is used to supply power to the corresponding power consumption load end of this power supply area. However, the high-voltage main bus is an important unit for the daily power transmission and distribution of the power system in the power supply area. The supporting systems such as the energy management system and the power meter reading system of the power system are all built relying on the high-voltage main bus. The line equipped with a transformer and an uninterruptible power supply is commonly used for the short-term power support of medium- and low-voltage equipment, and does not have a supporting energy management distribution and billing function. Using this line is not only difficult to support for a long time until the planned power outage is completed, but also easily leads to the ineffective energy management and distribution of the power consumption load in this power supply area during the planned power outage such as maintenance and repair, and the loss of the power billing function. Therefore, this switching scheme is still very difficult to solve the problem of switching the transmission bus under the condition of continuously supplying power to the power consumption load end within the preset position area.

[0027] In view of this, the solution of this specification provides a solution for an electrical load uninterruptible switching system and a power transmission system, which can utilize the high-voltage main bus, high-voltage bypass unit and each switching unit within the preset position area between different power supply areas, avoiding power supply interruption in the power supply area with remote / weak power infrastructure (only one high-voltage main bus in a power supply area) due to planned power outages for tasks such as maintenance and repair, and then realizing uninterruptible switching of power supply to the power consumption load end of the cross-border area transmission bus between different power supply areas, without the need to separately establish a new power system and its supporting systems such as energy management and power billing, without affecting the power supply methods (both AC and DC are applicable) and management methods of the power systems in different regions, improving the stability and reliability of the power transmission system, and having good economic value.

[0028] The following will describe in detail the technical solutions provided by each embodiment of this specification with reference to the accompanying drawings.

[0029] An embodiment of this specification provides an electrical load uninterruptible switching system. Please refer to Figure 1 , which may include:

[0030] A transmission switching unit 100, connected to a first high-voltage main bus L1 and a second high-voltage main bus L2 and also connected to a power consumption load end 400, for connecting the first high-voltage main bus L1 or the second high-voltage main bus L2 to the power consumption load end 400 for main bus power transmission. Both the first high-voltage main bus L1 and the second high-voltage main bus L2 pass through the preset position area between different power supply areas and are the high-voltage main buses of the power systems in different power supply areas.

[0031] In the embodiments of this specification, the foregoing first high-voltage main busbar and second high-voltage main busbar may both be main busbars passing through a preset position area. For example, there is a section of national border line within the preset position area. The position area south of this section of national border line within the preset position area belongs to the power supply area of Country A, and the first high-voltage main busbar passes through the position area south of this section of national border line. The position area north of this section of national border line within the preset position area belongs to the power supply area of Country B, and the second high-voltage main busbar passes through the position area north of this section of national border line. When looking at the corresponding position areas of each country's power supply areas separately, there is only one high-voltage main busbar, and they all belong to areas with weak power infrastructure construction. However, when considering the preset position area as a whole, there will be two high-voltage main busbars existing in this preset position area at the same time. Through the embodiments of this specification, an uninterrupted switching system is formed to achieve mutual guarantee of power supply and improve the power consumption experience of residents and producers in the areas near the boundary. It should be noted that the high-voltage main busbars in the power system have complete power supporting equipment for power transmission, distribution, and billing, etc., and can withstand a larger power consumption load for a long time compared with the medium- and low-voltage side equipment and lines.

[0032] In some possible implementation manners, the foregoing power transmission switch unit may be a unit that connects or disconnects the connection between the high-voltage main busbar and the power consumption load end. The power transmission switch unit may be connected to the first high-voltage main busbar and the second high-voltage main busbar and is also connected to the power consumption load end, but only one high-voltage main busbar is connected to the power consumption load end to avoid problems such as abnormal power distribution and duplicate billing in the power systems of different regions. Thus, the power transmission switch unit can be used to connect the first high-voltage main busbar or the second high-voltage main busbar to the power consumption load end. During the power transmission of the main busbar before / after switching, the power distribution and billing, etc. of the power consumption load end all operate normally according to the regulations or specifications of each power supply area. The power consumption load end may be the load end of any production and living activities that use electricity, and it may be within the foregoing preset position area, or outside the foregoing preset position area and within the specified area range. The implementation manner is not limited in the embodiments of this specification.

[0033] In some possible examples, the power transmission switch unit may be constituted by two switch units. Please refer to Figure 1 and Figure 2 , the power transmission switch unit 100 may include: a first switch unit 101, connected to the first high-voltage main busbar L1 and also connected to the power consumption load end 400; a second switch unit 102, connected to the second high-voltage main busbar L2 and also connected to the power consumption load end 400; wherein, one of the first switch unit 101 and the second switch unit 102 is used to connect the corresponding high-voltage main busbar to the power consumption load end for power transmission of the main busbar, and the other switch unit disconnects the connection between the corresponding high-voltage main busbar and the power consumption load end 400 during the power transmission of the non-interrupted main busbar.

[0034] The foregoing first switch unit 101 may include a load breaker and two disconnect switches, and are arranged between the first high-voltage main bus L1 and the power consumption load end 400 in the order of the first disconnect switch, the load breaker, and the second disconnect switch in the first switch unit 101. The load breaker is located between the two disconnect switches. The first disconnect switch in the first switch unit 101 is located between the first high-voltage main bus L1 and the load breaker. The second disconnect switch in the first switch unit 101 is located between the load breaker and the power consumption load end 400. The foregoing second switch unit 102 may also include a load breaker and two disconnect switches, and are arranged between the second high-voltage main bus L2 and the power consumption load end 400 in the order of the first disconnect switch, the load breaker, and the second disconnect switch in the second switch unit 102. The load breaker is located between the two disconnect switches. The first disconnect switch in the second switch unit 102 is located between the second high-voltage main bus L2 and the load breaker. The second disconnect switch in the second switch unit 102 is located between the load breaker and the power consumption load end 400. In Figure 2 The components included within the dashed box may all be a circuit breaker (the small solid rectangle within the dashed box) and two disconnect switches.

[0035] It can be understood that the first switch unit and the second switch unit may also be designed with other devices adapted to specific requirements such as protection devices, automated operation supporting devices, etc. according to application needs and the requirements of the local power supply area; the internal components of each switch unit operate together (opening and closing of disconnect switches, opening and closing of circuit breakers, etc.), and can be implemented in accordance with the power industry specifications and the requirements of each region; when all the disconnect switches are closed and the circuit breaker is closed, it forms the closed state (connection) of the corresponding switch unit, and when the disconnect switch is opened and / or the circuit breaker is opened, it forms the open state (connection disconnected) of the corresponding switch unit; in the embodiments of this specification, each switch unit can be understood in this way.

[0036] In the embodiments of this specification, please refer to Figure 1 that the foregoing uninterruptible electrical load switching system may further include:

[0037] A high-voltage bypass unit 200, connected to the first high-voltage main bus L1 and the second high-voltage main bus L2, for charging through at least one of the first high-voltage main bus L1 and the second high-voltage main bus L2. Figure 1 The dashed line in

[0038] In some possible implementations, the aforementioned high-voltage bypass unit can be a power supply unit that can establish a high-voltage bypass connection with respect to the connection between the high-voltage main bus and the power consumption load end, and is also a unit that can be charged and discharged. Since the power supply areas that need to perform tasks such as maintenance and repair within the preset position area are planned power transmission interruptions, the aforementioned high-voltage bypass unit can be charged through at least one main bus before the task is executed. In order to further reduce the cross-power supply situation of the power systems in different power supply areas, it is preferably to use only one main bus for charging, and the high-voltage main bus of the power system within the power supply area that needs to perform tasks such as maintenance and repair can be used to charge the aforementioned high-voltage bypass unit. Thus, during charging, the high-voltage bypass unit can be used as a power consumption terminal, and power distribution and billing can be managed in the normal way according to the area. For example, the second high-voltage main bus during power transmission at the power consumption load end can charge the aforementioned high-voltage bypass unit before tasks such as maintenance and repair are required.

[0039] In some possible examples, please refer to Figure 1 and Figure 2 , a high-voltage bypass bus L0 (which can be relative to a high-voltage main bus with the same power transmission performance), a power energy storage unit, and a switch unit can be arranged in the aforementioned high-voltage bypass unit. The high-voltage bypass unit 200 may include: a third switch unit 201 connected to the first high-voltage main bus L1; a fourth switch unit 202 connected to the second high-voltage main bus L2; a high-voltage bypass bus L0 connected to the third switch unit 201 and also connected to the fourth switch unit 202; a power energy storage unit connected to the high-voltage bypass bus L0, configured to be connected to the corresponding high-voltage main bus through at least one of the switch units, i.e., the third switch unit 201 and the fourth switch unit 202, connected to the high-voltage bypass bus L0 for charging; the high-voltage bypass bus L0 is also connected to the power consumption load end 400 through the switching switch unit 300, configured to connect the power energy storage unit to the power consumption load end 400 for power transmission.

[0040] The aforementioned third switch unit 201 may include two disconnect switches and one bus coupler breaker, and is sequentially connected between the first high-voltage main bus L1 and the high-voltage bypass bus L0 in the order of the first disconnect switch, the bus coupler breaker, and the second disconnect switch in the third switch unit 201. The bus coupler breaker is between the two disconnect switches. The first disconnect switch in the third switch unit 201 is located between the first high-voltage main bus L1 and the bus coupler breaker, and the second disconnect switch in the third switch unit 201 is located between the bus coupler breaker and the high-voltage bypass bus L0. The aforementioned fourth switch unit 202 may also include two disconnect switches and one bus coupler breaker, and is sequentially connected between the second high-voltage main bus L2 and the high-voltage bypass bus L0 in the order of the first disconnect switch, the bus coupler breaker, and the second disconnect switch in the fourth switch unit 202. The bus coupler breaker is between the two disconnect switches. The first disconnect switch in the fourth switch unit 202 is located between the second high-voltage main bus L2 and the bus coupler breaker, and the second disconnect switch in the fourth switch unit 202 is located between the bus coupler breaker and the high-voltage bypass bus L0.

[0041] The aforementioned high-voltage bypass bus L0 may be a single bus, but the high-voltage bypass bus L0 may not require additional construction of supporting facilities such as power energy transmission and distribution management and power billing, and can play the role of short-time power transmission (relative to the planned power outage time for longer maintenance and repair tasks) during the interruption of the main bus transmission of the main bus, providing a line foundation for the uninterrupted power transmission bus switching. The aforementioned power energy storage unit may be a chargeable and dischargeable device, capable of short-time bearing the electrical load of the high-voltage main bus, obtaining electrical energy through the aforementioned high-voltage bypass bus L0, and connecting the aforementioned high-voltage bypass bus L0 to the electrical load end 400 through the switching switch unit 300 to transmit power to the electrical load end 400.

[0042] Among them, the aforementioned power energy storage unit may preferably include: a fifth switch unit 203 connected to the high-voltage bypass bus L0; a voltage conversion unit 204 connected to the fifth switch unit 203; a battery energy storage unit 205 connected to the voltage conversion unit 204; the fifth switch unit 203 is configured to connect the voltage conversion unit 204 to the high-voltage bypass bus L0 before the main bus power transmission to the power consumption load end 400 is interrupted in the first high-voltage main bus L1 or the second high-voltage main bus L2. The fifth switch unit 203 may include two disconnectors and a bypass circuit breaker. The first disconnector in the fifth switch unit 203 is connected to the high-voltage bypass bus L0 and is also connected to the bypass circuit breaker. The bypass circuit breaker is connected to the second disconnector in the fifth switch unit 203. The second disconnector in the fifth switch unit 203 is also connected to the voltage conversion unit 204. The voltage conversion unit 204 may preferably be a transformer. The capacity scale of the battery energy storage unit 205 can be selected and set according to power indicators such as the peak value and average value of the power consumption load in the power supply area within the preset location area and the test results.

[0043] It can be understood that the aforementioned high-voltage bypass unit can also be designed according to needs and the characteristics of the power supply area, without necessarily being implemented exactly as in the foregoing example. For example, the high-voltage bypass unit may include a high-voltage transmission line, a power station at a low altitude position within the preset location area, and a reservoir at a high altitude position. The power station may include a water pump, a generator, a transformer, etc. When the second high-voltage main bus (or the first high-voltage main bus) charges the high-voltage bypass unit (without being related to the planned time of maintenance and repair tasks, etc., and can be executed during the period of power production overcapacity), the transformer and the water pump in the power station use the charged electric energy through the high-voltage transmission line to pump water from the low altitude position to the reservoir at the high altitude position. Before the second high-voltage main bus needs to interrupt power transmission, the reservoir at the high altitude position can be drained so that the generator and the transformer in the power station generate electric energy with stable voltage for a certain duration, and the high-voltage transmission line is connected to the power consumption load end of the second high-voltage main bus through the switching switch unit to conduct power transmission through the power station and the high-voltage transmission line during the interruption of the second high-voltage main bus power transmission.

[0044] In the embodiments of this specification, please refer to Figure 1 , the aforementioned electrical load uninterrupted switching system may further include:

[0045] The switching switch unit 300 is connected to the high-voltage bypass unit 200 and also to the power consumption load end 400, and is configured to connect the high-voltage bypass unit 200 to the power consumption load end 400 before the main bus power transmission to the power consumption load end 400 is interrupted by the first high-voltage main bus L1 or the second high-voltage main bus L2, so as to perform power transmission during the interruption of the main bus power transmission; wherein, the power transmission switch unit 100 is further configured to disconnect the connection between the interrupted power transmission main bus among the first high-voltage main bus L1 and the second high-voltage main bus L2 and the power consumption load end 400 after the high-voltage bypass bus L0 is connected to the power consumption load end 400, and connect the other main bus to the power consumption load end 400 to resume the main bus power transmission.

[0046] In the embodiments of the present specification, the switching switch unit 300 may be a unit that switches between the high-voltage main bus of the power consumption load end 400 and the high-voltage bypass unit 200. The power transmission switch unit 100 performs the main bus switching, and during the interruption of the main bus power transmission, the switching switch unit 300 may maintain the connection between the high-voltage bypass bus L0 and the power consumption load end 400, so as to achieve uninterrupted power supply during the switching of the power transmission bus of the power consumption load end 400.

[0047] In some possible implementation manners, the switching switch unit 300 may also be configured to disconnect the connection between the high-voltage bypass unit 200 and the power consumption load end 400 after the main bus power transmission is restored, so as to transfer the management of power transmission, distribution, and billing of the power consumption load end 400 to the power system corresponding to the non-interrupted switching target high-voltage main bus. The switching process is a change in the switch state, and the power source of the high-voltage bypass unit 200 is the power system of the high-voltage main bus whose power transmission is interrupted for tasks such as maintenance and repair (already billed by this power system). It can basically support the completion of the bus switching within a short time entirely through the charged electric energy, and the charged electric energy can replace the power supply electric energy of the power system of the high-voltage main bus whose power transmission is interrupted for tasks such as maintenance and repair, and hardly uses the electric energy provided by the power system of the switching target high-voltage main bus additionally.

[0048] In some possible examples, please refer to Figure 1 and Figure 2, the switching switch unit 300 includes: a sixth switch unit 301, connected to the high-voltage bypass bus L0 and also to the power consumption load terminal 400, for connecting the high-voltage bypass bus L0 to the power consumption load terminal 400 before the main bus power transmission from the first high-voltage main bus L1 or the second high-voltage main bus L2 to the power consumption load terminal 400 is interrupted, so as to transmit power to the power consumption load terminal 400 through the battery energy storage unit 205 during the interruption of the main bus power transmission. The sixth switch unit 301 may include two disconnectors and one load breaker. The first disconnector in the sixth switch unit 301 may be connected to the high-voltage bypass bus L0 in the high-voltage bypass unit 200 and may also be connected to the load breaker. The load breaker may also be connected to the second disconnector in the sixth switch unit 301. The second disconnector in the sixth switch unit 301 may also be connected to the power consumption load terminal 400.

[0049] It should be noted that, in order to avoid the intervention of the non-expected switching switch unit in the power consumption load terminals of each power supply area and cause grid instability, the foregoing switching switch unit may include at least two switch units. Each of these switch units can be implemented with reference to the sixth switch unit. The at least two switch units may be connected in series. At least one of the switch units connected in series is located on one side of the boundary line of the preset position area, and at least another switch unit connected in series is located on the other side of the boundary line of the preset position area. Thus, only when all the switch units are closed can the high-voltage bypass unit be connected to the power consumption load terminal.

[0050] In the embodiments of this specification, in an example of using the foregoing switching system, please refer to Figure 1 and Figure 2 , the power transmission switch unit 100 can be used to connect the second high-voltage main bus L2 to the power consumption load terminal 400 for main bus power transmission, and disconnect the connection between the first high-voltage main bus L1 and the power consumption load terminal 400; the third switch unit 201 can be used to disconnect the connection between the first high-voltage main bus L1 and the high-voltage bypass bus L0 during the uninterrupted main bus power transmission; the fourth switch unit 202 can be used to connect the second high-voltage main bus L2 to the power energy storage unit through the high-voltage bypass bus L0 for charging before the second high-voltage main bus L2 interrupts the main bus power transmission to the power consumption load terminal 400.

[0051] The switching switch unit 300 can be used to connect the high-voltage bypass bus L0 to the power consumption load terminal 400 after the power energy storage unit is fully charged or charged to a specified state of charge, so as to transmit power to the power consumption load terminal 400 through the power energy storage unit; the power transmission switch unit 100 can also be used to disconnect the connection between the second high-voltage main bus L2 and the power consumption load terminal 400 after the high-voltage bypass bus L0 is connected to the power consumption load terminal 400; the fourth switch unit 202 can also be used to disconnect the connection between the second high-voltage main bus L2 and the high-voltage bypass bus L0 after the high-voltage bypass bus L0 is connected to the power consumption load terminal 400.

[0052] The third switch unit 201 can also be used to connect the first high-voltage main bus L1 to the high-voltage bypass bus L0 after the connection between the second high-voltage main bus L2 and the high-voltage bypass bus L0 is disconnected, so as to supply power to the high-voltage bypass bus L0; the power transmission switch unit 100 can also be used to connect the first high-voltage main bus L1 to the power consumption load terminal 400 to resume main bus power transmission; the switching switch unit 300 can also be used to disconnect the connection between the high-voltage bypass bus L0 and the power consumption load terminal 400 after the main bus power transmission is resumed.

[0053] In the embodiments of this specification, the foregoing electrical load uninterrupted switching system can switch the high-voltage main bus in the power supply area that needs to perform maintenance and repair tasks within a preset position area to the high-voltage main bus in the non-interrupted power supply area within the preset position area, and continuously transmit power to the power consumption load terminal in the power supply area that needs to perform maintenance and repair tasks, and can also switch back from the high-voltage main bus in the non-interrupted power supply area within the preset position area to the high-voltage main bus in the power supply area that has completed the task, and continuously transmit power to the power consumption load terminal. Among them, the first high-voltage main bus can be the high-voltage main bus in the non-interrupted power supply area, and the second high-voltage main bus can be the high-voltage main bus in the power supply area that needs to perform maintenance and repair plans, or the first high-voltage main bus can be the high-voltage main bus in the power supply area that needs to perform maintenance and repair plans, and the second high-voltage main bus can be the high-voltage main bus in the non-interrupted power supply area.

[0054] It is understandable that each power supply area may have more than one high-voltage main busbar. In the aforementioned switching system, only the first high-voltage main busbar and the second high-voltage main busbar are used as the switching target busbar pair. The influence of other main busbars can be shielded by the switch unit, and the switching target busbar pair that needs to be paid attention to is connected to the aforementioned switching system according to the aforementioned example to perform uninterrupted switching, rather than being limited to only being able to achieve switching between two high-voltage main busbars. In addition, there may be more than two power supply areas in the preset location area. In the aforementioned switching system, only the power supply areas corresponding to the first high-voltage main busbar and the second high-voltage main busbar are used as target area combinations, rather than being limited to only being able to achieve bus switching for uninterrupted power transmission between the two power supply areas in the preset location area. The first high-voltage main busbar and the second high-voltage main busbar in the preset location area have perfect power transmission management and power distribution equipment, and both the first high-voltage main busbar and the second high-voltage main busbar can have power load terminals, rather than being limited to the uninterrupted high-voltage main busbar without power load terminals.

[0055] Each unit in the aforementioned electrical load uninterruptible switching system can be located on one side of the boundary in the preset position area, or distributed on multiple sides of the boundary. The connection in the aforementioned electrical load uninterruptible switching system can be realized by fully automatic operation of the controller, manual operation of some switch units and controller-controlled switch units, or all by manual operation.

[0056] In the embodiments of this specification, the first high-voltage main bus and the second high-voltage main bus are interchangeable. In order to more clearly illustrate the switching connection relationship, the first high-voltage main bus can be a high-voltage main bus in an area where power supply is not interrupted, and the second high-voltage main bus can be a high-voltage main bus in an area where maintenance and overhaul plans are required. On this basis, the embodiments of this specification also provide a switching method for the aforementioned electrical load uninterrupted switching system. Please refer to Figure 1 , Figure 2 and Figure 3 , which may include:

[0057] S1, before switching, determining that the second switch unit 102 in the power transmission switch unit 100 is in a closed state.

[0058] The load circuit breaker in the second switch unit 102 is closed and the corresponding isolating switch is closed, and the second high-voltage main bus L2 is connected to the power load terminal 400 through the second switch unit 102. At this time, the power load terminal 400 is still powered by the second high-voltage main bus L2.

[0059] S2, placing the fourth switch unit 202 in the high-voltage bypass unit 200 in a closed state.

[0060] The bus-tie breaker in the fourth switch unit 202 closes and the corresponding disconnect switch closes. The second high-voltage main bus L2 is connected to the high-voltage bypass bus L0 in the high-voltage bypass unit 200 through the fourth switch unit 202 to charge the power energy storage unit in the high-voltage bypass unit 200 via the high-voltage bypass bus L0. The high-voltage bypass unit 200, as a power consumption terminal of the power system corresponding to the second high-voltage main bus L2, can be managed and billed by the power system corresponding to the second high-voltage bus L2.

[0061] S3, if the power energy storage unit is fully charged or charged to the specified state of charge, place the switching switch unit 300 in the closed state, place the second switch unit 102 in the disconnect switch unit 100 in the open state, and place the fourth switch unit 202 in the high-voltage bypass unit 200 in the open state. If the charging is not completed or not charged to the specified state of charge, it is necessary to continue to maintain the switch state of charging in step S2 until the power energy storage unit is fully charged or charged to the specified state of charge.

[0062] The load breaker in the sixth switch unit 301 in the switching switch unit 300 closes and the corresponding disconnect switch closes. The load breaker in the second switch unit 102 opens and the corresponding disconnect switch opens. The bus-tie breaker in the fourth switch unit 202 opens and the corresponding disconnect switch opens. At this time, the high-voltage bypass bus L0 is connected to the power consumption load terminal 400 through the sixth switch unit 301 for bypass bus power transmission, and the main bus power transmission from the second high-voltage main bus L2 to the power consumption load terminal 400 is interrupted. Although the power consumption load terminal 400 is in the period of main bus power transmission interruption, the power consumption load terminal 400 is continuously powered by the power energy storage unit via the high-voltage bypass bus L0. The power supply area corresponding to the second high-voltage main bus L2 can start to perform tasks such as maintenance and overhaul without causing power outages in this power supply area.

[0063] S4, place the third switch unit 201 in the high-voltage bypass unit 200 in the closed state, place the first switch 101 unit in the disconnect switch unit 100 in the closed state, and place the switching switch unit 300 in the open state.

[0064] The bus-tie breaker in the third switch unit 201 closes and the corresponding disconnect switch closes to supply power to the high-voltage bypass bus L0 through the first high-voltage main bus L1. The load breaker in the first switch unit 101 closes and the corresponding disconnect switch closes. The first high-voltage main bus L1 is connected to the power consumption load terminal 400 through the first switch unit 101 to resume main bus power transmission. The load breaker in the sixth switch unit 301 in the switching switch unit 300 opens and the corresponding disconnect switch opens, thereby disconnecting the connection between the high-voltage bypass unit 200 and the power consumption load terminal 400 to end the power transmission of the high-voltage bypass bus L0 to the power consumption load terminal 400.

[0065] S5, placing the third switch unit 201 in the high-voltage bypass unit 200 in an off state.

[0066] The bus tie circuit breaker in the third switch unit 201 is opened and the corresponding isolating switch is disconnected, thereby stopping the first high-voltage main bus L1 from charging the power storage unit via the high-voltage bypass bus L0, and ending a main bus switching process.

[0067] Among them, the aforementioned state of charge may be at least greater than or equal to the state of charge corresponding to the electric energy required for uninterrupted power transmission at the power load end from the time when the fourth switch unit is placed in the open state to the time when the third switch unit in the high-voltage bypass unit is placed in the closed state when the switching switch unit is in the closed state. The aforementioned short-term expression may refer to the time length between the moment when the third switch unit in the high-voltage bypass unit is placed in the closed state and the moment when the switching switch unit is placed in the open state, and after the switching switch unit is placed in the open state, the third switch unit in the high-voltage bypass unit may be placed in the open state immediately, so that the power supply time of the first high-voltage main busbar through the high-voltage bypass busbar will be very short, and the electric energy supplied by the first high-voltage main busbar to the high-voltage bypass busbar relative to the electric energy consumed by the power load end per unit time may be ignored, and the electric energy of the first high-voltage main busbar for main busbar transmission to the power load end may be determined by using the corresponding power equipment management and billing in the power system matched with the first high-voltage main busbar, thereby ensuring both the uninterrupted power supply to the power load end and the economic benefits of the power system are not lost.

[0068] In the embodiments of this specification, the switching method of the aforementioned uninterruptible switching system for electrical loads provides assistance for power management and billing in each power supply area, but it is not the only switching method to achieve uninterrupted power supply. For example, the third switch unit and the fourth switch unit may always have one switch unit connected to the high-voltage bypass bus to maintain the charge state of the power storage unit. In addition, the maintenance and inspection tasks of the power supply area corresponding to the second high-voltage main bus can be completed, and on the basis of the above-mentioned switching, the aforementioned power load end can be switched back to the state where the second high-voltage main bus performs main bus power transmission. Please continue to combine Figure 1 , Figure 2 and Figure 3 , the switching method may further include:

[0069] S6, before switching, determining that the first switch unit 101 in the power transmission switch unit 100 is in a closed state.

[0070] S7, placing the third switch unit 201 in the high-voltage bypass unit 200 in a closed state.

[0071] S8. If the power energy storage unit is fully charged, charged to a specified state of charge, or its state of charge is not lower than the specified state of charge, then the switching switch unit 300 is placed in the closed state, the first switch unit 101 in the power transmission switch unit 100 is placed in the open state, and the third switch unit 201 in the high-voltage bypass unit 200 is placed in the open state.

[0072] S9. Place the fourth switch 202 unit in the high-voltage bypass unit 200 in the closed state, place the second switch unit 102 in the power transmission switch unit 100 in the closed state, and then place the switching switch unit 300 in the open state.

[0073] S10. Place the fourth switch unit 202 in the high-voltage bypass unit 200 in the open state.

[0074] The closed state and open state of each switch unit correspond to the opening and closing of the circuit breaker and the opening and closing of the disconnecting switch, which will not be elaborated one by one. Thus, uninterrupted switching is achieved again. At this time, the power consumption load end switches back to the main bus power transmission by the second high-voltage main bus, and tasks such as maintenance and repair of the power supply area corresponding to the second high-voltage main bus will not cause the power supply interruption at the power consumption load end of this area, and it can provide a good power consumption experience for residents and producers in the area near the boundary of different power supply areas.

[0075] An embodiment of this specification provides a power transmission system under the same inventive concept as the foregoing embodiment, which may include:

[0076] The first high-voltage main bus, which is the high-voltage main bus of the first power system;

[0077] The aforementioned electrical load uninterrupted switching system, which is connected to the first high-voltage main bus and the second high-voltage main bus and is also connected to the power consumption load end, is used to disconnect the connection between one of the first high-voltage main bus and the second high-voltage main bus and the power consumption load end, and connect the other main bus to the power consumption load end for power transmission;

[0078] Wherein, the second high-voltage main bus is the high-voltage main bus of the second power system, the first power system and the second power system belong to different power supply areas, and both the first high-voltage main bus and the second high-voltage main bus pass through the preset position area between different power supply areas.

[0079] In the embodiment of this specification, the first high-voltage main bus and the second high-voltage main bus, the first power system and the second power system can be mutually replaced. The power transmission system can be constructed and implemented on any at least one side of the boundary of the aforementioned preset position area to achieve at least the bus power transmission switching for uninterrupted power supply to the opposite side. In a possible example, please refer to Figure 4 , the power transmission system 1, may include:

[0080] The first high-voltage main bus L1 is the high-voltage main bus of the first power system;

[0081] The aforementioned electrical load uninterrupted switching system is connected to the first high-voltage main bus L1 and the second high-voltage main bus L2 ( Figure 4 not shown) and is also connected to the power consumption load end ( Figure 4 not shown), and is used to disconnect the connection between one of the first high-voltage main bus L1 and the second high-voltage main bus L2 and the power consumption load end, and connect the other main bus to the power consumption load end for power transmission;

[0082] Wherein, the second high-voltage main bus L2 is the high-voltage main bus of the second power system, the first power system and the second power system belong to the power supply areas of Country A and Country B respectively, the first high-voltage main bus L1 and the second high-voltage main bus L2 both pass through the preset position area B between different power supply areas, and there is a boundary line C in the preset position area. The power transmission system 1 can supply power to the power consumption load end of the power transmission system 2 through the high-voltage bypass bus L0 in the high-voltage bypass unit, so that maintenance and repair tasks can be carried out on the second power system and the second high-voltage main bus in the power transmission system 2. At the same time, it will not cause power supply interruption in the power supply area of Country B in the preset position area B.

[0083] All activities carried out between different power supply areas in this specification shall comply with the laws, regulations or relevant area regulations of the country or administrative region, and are subject to appropriate supervision.

[0084] It should also be noted that the foregoing first (one), second (one), etc. terms are only used for differential description and do not represent limitations such as order and importance. The terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including the elements in this disclosure not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device.

[0085] The present invention has been described above with reference to the embodiments of this specification. Each embodiment in this specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other. The key point of each embodiment is to illustrate the differences from other embodiments. However, these embodiments are only for the purpose of illustration and not for limiting the scope of this specification. Without departing from the scope of this disclosure, those of ordinary skill in the art can make various substitutions and modifications, and these substitutions and modifications should fall within the scope of this disclosure.

Claims

1. An uninterruptible switching system for an electrical load, characterized in that, Comprising: A power transmission switch unit, connected to the first high-voltage main bus and the second high-voltage main bus and also connected to the power consumption load end, for connecting the first high-voltage main bus or the second high-voltage main bus to the power consumption load end to conduct main bus power transmission. Both the first high-voltage main bus and the second high-voltage main bus pass through a preset position area between different power supply regions and are the high-voltage main buses of the power systems in different power supply regions; A high-voltage bypass unit, connected to the first high-voltage main bus and the second high-voltage main bus, for charging through at least one of the first high-voltage main bus and the second high-voltage main bus; A switching switch unit, connected to the high-voltage bypass unit and also connected to the power consumption load end, for connecting the high-voltage bypass unit to the power consumption load end before the main bus power transmission of the first high-voltage main bus or the second high-voltage main bus to the power consumption load end is interrupted, so as to conduct power transmission during the interruption of the main bus power transmission; Wherein, the power transmission switch unit is further used for disconnecting the connection between one of the first high-voltage main bus and the second high-voltage main bus that has interrupted power transmission and the power consumption load end after the high-voltage bypass bus in the high-voltage bypass unit is connected to the power consumption load end, and connecting the other main bus to the power consumption load end to resume the main bus power transmission.

2. The electrical load uninterrupted switching system according to claim 1, wherein The power transmission switch unit includes: A first switch unit, connected to the first high-voltage main bus and also connected to the power consumption load end; A second switch unit, connected to the second high-voltage main bus and also connected to the power consumption load end; Wherein, one of the first switch unit and the second switch unit is used for connecting the corresponding high-voltage main bus to the power consumption load end to conduct main bus power transmission, and the other switch unit disconnects the connection between the corresponding high-voltage main bus and the power consumption load end during the non-interrupted main bus power transmission.

3. The electrical load uninterruptible switching system according to claim 1, characterized in that, The high-voltage bypass unit includes: A third switch unit, connected to the first high-voltage main bus; A fourth switch unit, connected to the second high-voltage main bus; The high-voltage bypass bus, connected to the third switch unit and also connected to the fourth switch unit; A power energy storage unit, connected to the high-voltage bypass bus, for connecting to the corresponding high-voltage main bus through at least one of the third switch unit and the fourth switch unit connected to the high-voltage bypass bus to conduct charging; The high-voltage bypass bus is also connected to the power consumption load end through the switching switch unit, for connecting the power energy storage unit to the power consumption load end to conduct power transmission.

4. The electrical load uninterruptible switching system according to claim 3, wherein The power energy storage unit includes: A fifth switch unit, connected to the high-voltage bypass bus; A voltage conversion unit, connected to the fifth switch unit; A battery energy storage unit, connected to the voltage conversion unit; The fifth switch unit is used for connecting the voltage conversion unit to the high-voltage bypass bus before the main bus power transmission of the first high-voltage main bus or the second high-voltage main bus to the power consumption load end is interrupted.

5. The electrical load uninterruptible switching system according to claim 1, characterized in that, The switching switch unit is further used for disconnecting the connection between the high-voltage bypass unit and the power consumption load end after the main bus power transmission is resumed.

6. The electrical load uninterrupted switching system according to claim 4, characterized in that, The switching switch unit includes: A sixth switch unit, connected to the high-voltage bypass bus and also to the power consumption load end, for connecting the high-voltage bypass bus to the power consumption load end before the first high-voltage main bus or the second high-voltage main bus interrupts the main bus power transmission to the power consumption load end, so as to transmit power to the power consumption load end during the interruption of the main bus power transmission through the battery energy storage unit.

7. The uninterruptible electrical load switching system according to claim 3, wherein The power transmission switch unit is used to connect the second high-voltage main bus to the power consumption load end for main bus power transmission, and disconnect the connection between the first high-voltage main bus and the power consumption load end; The third switch unit is used to disconnect the connection between the first high-voltage main bus and the high-voltage bypass bus during the non-interrupted main bus power transmission; The fourth switch unit is used to connect the second high-voltage main bus to the power energy storage unit through the high-voltage bypass bus for charging before the second high-voltage main bus interrupts the main bus power transmission to the power consumption load end.

8. The uninterruptible electrical load switching system according to claim 7, wherein The switching switch unit is used to connect the high-voltage bypass bus to the power consumption load end after the power energy storage unit is fully charged or charged to a specified state of charge, so as to transmit power to the power consumption load end through the power energy storage unit; The power transmission switch unit is also used to disconnect the connection between the second high-voltage main bus and the power consumption load end after the high-voltage bypass bus is connected to the power consumption load end; The fourth switch unit is also used to disconnect the connection between the second high-voltage main bus and the high-voltage bypass bus after the high-voltage bypass bus is connected to the power consumption load end.

9. The uninterruptible electrical load switching system according to claim 8, wherein The third switch unit is also used to connect the first high-voltage main bus to the high-voltage bypass bus to supply power to the high-voltage bypass bus after the connection between the second high-voltage main bus and the high-voltage bypass bus is disconnected; The power transmission switch unit is also used to connect the first high-voltage main bus to the power consumption load end to resume main bus power transmission; The switching switch unit is also used to disconnect the connection between the high-voltage bypass bus and the power consumption load end after the main bus power transmission is resumed.

10. A power transmission system, characterized in that, including: A first high-voltage main bus, which is the high-voltage main bus of the first power system; The uninterruptible electrical load switching system according to any one of claims 1 to 9, connected to the first high-voltage main bus and the second high-voltage main bus and also to the power consumption load end, for disconnecting the connection between one of the first high-voltage main bus and the second high-voltage main bus and the power consumption load end, and connecting the other main bus to the power consumption load end for power transmission; Wherein, the second high-voltage main bus is the high-voltage main bus of the second power system, the first power system and the second power system belong to different power supply areas, and both the first high-voltage main bus and the second high-voltage main bus pass through a preset position area between different power supply areas.

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