Intelligent switch system and method for load transfer in distribution area

Abstract

The present invention provides an intelligent switch system for load transfer in a substation, comprising a plurality of substations, each of which comprises at least one transformer for connecting one or more loads; an intelligent switching switch, wherein the intelligent switching switch can switch between a transformer connected to a first substation and a transformer connected to a second substation among the plurality of substations; wherein the intelligent switching switch connects a switchable load; the first substation and the second substation respectively comprise a substation load detection device for detecting the load condition of the substation to which they belong; the intelligent switching switch can dynamically switch the switchable load connected by the intelligent switching switch from one of the first substation and the second substation to another substation according to the load condition. The present invention can maximize the utilization rate of existing substations and transformers, improve the utilization rate of equipment, and improve the safe operation capability of equipment. At the same time, the load density of transformers in the substation is evenly distributed, reducing transformer losses.

Description

Technical Field

[0001] The present disclosure relates to the field of power control, and in particular to an intelligent switch system and method for load transfer in a distribution area. Background Art

[0002] With the rapid development of the national economy, the amount of electricity consumed by residents has increased significantly, and the scale of the power grid has also expanded accordingly. For the power system, the power supply system is an important part of the system. As the end of the power system, the operation quality of the medium and low voltage distribution network directly determines the quality of power for consumers. At present, with the increasing power load, the transformer load in the low-voltage power supply area often exceeds the design capacity. There are many difficulties in increasing the number of areas, such as land acquisition difficulties and increased investment. However, in operation and maintenance, it is often the case that one area is running at full load, while the transformer in the adjacent area is running at a low load rate. If a part of the heavy-loaded area load is switched to the light-loaded area manually, the problem can certainly be solved, but it often brings the following operational difficulties:

[0003] 1. Power outage is required. To adjust part of the load to the lowest load rate, the station area needs to apply for a power outage, resulting in a short-term interruption of power supply to users.

[0004] 2. The load rate of the overloaded area is not detected in time. Manual adjustment can only be made by analyzing the historical data of the distribution transformer terminal or the centralized meter reading system, and then it can be implemented after a series of cumbersome procedures such as applying for power outage plan and dispatching workers. Therefore, it cannot be used as a normal routine operation and inspection work.

[0005] Therefore, the existing technology has poor flexibility in load regulation and cannot prevent and adjust problems in advance; the coordination ability is low and it is difficult to cooperate in time to achieve overall optimization and regulation. As a result, the problem of stable operation of the distribution network has become more and more prominent, and the regulation performance of the distribution network needs to be optimized urgently. Summary of the invention

[0006] In response to the existing problems, on the one hand, the present disclosure provides an intelligent switch system for load transfer in substations, which monitors the load rate of transformers in adjacent substations in real time, and automatically switches a part of the predetermined load from the heavy-loaded substation to the light-loaded substation when the load rate difference between the two substations is large. By connecting adjacent substations in pairs, a regional automatic load distribution system between substations is formed. In this way, the utilization rate of existing substations can be maximized, the utilization rate of equipment can be improved, the safe operation capacity of equipment can be improved, the workload of operation and maintenance staff can be reduced, the number of power outages and operation and maintenance can be reduced, and the power supply quality can be improved. At the same time, the balanced distribution of the load density of transformers in the substations is also conducive to the transformers operating in the best economic operating state and reducing transformer losses.

[0007] The system includes: multiple substations, each substation includes at least one transformer for connecting one or more loads; an intelligent switching switch, which can switch between the transformer connected to the first substation and the transformer connected to the second substation among the multiple substations; wherein the intelligent switching switch connects the switchable load; the first substation and the second substation are respectively provided with a substation load detection device for detecting the load status of the transformer in the substation to which they belong, and transmitting the load status to the intelligent switching switch; the intelligent switching switch dynamically switches the switchable load connected by the intelligent switching switch from one of the first substation and the second substation to another substation according to the load status.

[0008] Furthermore, the detecting of the load condition of the area to which it belongs includes detecting the power parameters of the area to which it belongs.

[0009] Furthermore, the power parameters include any item of load current, instantaneous current of each phase in the substation, active power, reactive power or power factor.

[0010] Furthermore, the first stage area and the second stage area are adjacent to each other.

[0011] Furthermore, any two of the multiple substations are connected to a shared intelligent switching switch.

[0012] Furthermore, the intelligent switching switch determines whether a preset load switching condition is met based on the received load condition, and performs load switching if the condition is met.

[0013] Furthermore, the load switching condition includes that the load of the first substation currently connected is greater than a first threshold, while the load of the second substation is less than a second threshold.

[0014] Furthermore, before performing load switching, the intelligent switching switch sends a switching permission request to two load detection devices connected to the intelligent switching switch; after receiving the permission instructions replied by the two load detection devices, the load switching is executed; and a switching completion is sent to the two load detection devices.

[0015] Furthermore, the system includes a household change identification device for storing load information of the substation, wherein the load information includes household change relations; after the load switching is completed, the household change identification device receives a household change relation reorganization instruction and updates the information.

[0016] Furthermore, the intelligent switching switch includes a control unit for executing switching logic; a power supply unit for supplying power to the intelligent switching switch; a communication unit for communicating with an external device and transmitting information; and a power main circuit unit for switching the connected switchable load between the first area and the second area.

[0017] Furthermore, the power main loop unit includes a thyristor and a relay for realizing the switching.

[0018] On the other hand, the present disclosure provides an intelligent switching switch for intelligently switching loads between substations, comprising: a control unit for executing switching logic; a power supply unit for supplying power to the intelligent switching switch; a communication unit for communicating with an external device and transmitting information; a power main circuit unit for switching a connected switchable load between a first substation and a second substation; wherein the control unit issues a switching instruction to the power main circuit unit based on the load conditions of the first substation and the second substation, and in response to the switching instruction, the power main circuit unit dynamically switches the switchable load from one of the first substation and the second substation to the other substation.

[0019] Furthermore, the main power loop unit includes a thyristor and a relay for realizing the switching.

[0020] Furthermore, the load condition is detected and obtained by load detection devices in the first and second substations; the load condition includes power parameters of the substations.

[0021] Furthermore, the first stage area and the second stage area are adjacent to each other.

[0022] Furthermore, the control unit determines whether a preset load switching condition is met according to the load status, and issues the switching instruction if the condition is met.

[0023] Furthermore, the load switching condition includes that the load of the first substation currently connected is greater than a first threshold, while the load of the second substation is less than a second threshold.

[0024] Furthermore, before performing load switching, the intelligent switching switch sends a switching permission request to the load detection device connected to the intelligent switching switch; after receiving the permission instruction replied by the load detection device, the load switching is executed; and a switching completion is sent to the load detection device.

[0025] Furthermore, after the intelligent switching switch completes the load switching, it sends a household change relationship reorganization instruction to the household change identification device so that the household change identification device can update information.

[0026] Through the above system and intelligent switching switch, the load rate of transformers in adjacent areas is monitored in real time. When the load rate difference between the two areas is large, part of the scheduled load is automatically switched from the heavy-load area to the light-load area. By connecting adjacent areas two by two, a regional load automatic distribution system between stations is formed. In this way, the utilization rate of existing transformers is maximized, the utilization rate of equipment is improved, the safe operation capacity of equipment is improved, the workload of operation and inspection staff is reduced, the number of power outages and operation and inspections is reduced, and the power supply quality is improved. At the same time, the balanced distribution of the load density of transformers in the area is also conducive to the operation of transformers in the best economic operation state and the reduction of transformer losses.

[0027] On the other hand, the present disclosure provides a smart switch method for substation load transfer, including: a transformer connected to a first substation and a transformer connected to a second substation can be switched through a smart switching switch to achieve dynamic switching of a switchable load; substation load detection devices are respectively provided in the first substation and the second substation to respectively detect the load conditions of the transformers in each of the first substation and the second substation; the load conditions are transmitted to the smart switching switch; and the smart switching switch dynamically switches the switchable load connected to the smart switching switch from one of the first substation and the second substation to another substation according to the load conditions.

[0028] On the other hand, the present disclosure provides a method for an intelligent switching switch for intelligently switching loads between substations, wherein the intelligent switching switch includes a control unit for executing switching logic; a power supply unit for supplying power to the intelligent switching switch; a communication unit for communicating with an external device and transmitting information; and a power main circuit unit for switching a connected switchable load between a first substation and a second substation, wherein: according to the load conditions of the first substation and the second substation, the controller of the intelligent switching switch sends a switching instruction to the power main circuit unit, and in response to the switching instruction, the power main circuit unit dynamically switches the switchable load from one of the first substation and the second substation to the other substation.

[0029] Through the above method, the load rate of transformers in adjacent areas is monitored in real time. When the load rate difference between the two areas is large, part of the scheduled load is automatically switched from the heavy-load area to the light-load area. By connecting adjacent areas two by two, a regional load automatic distribution system between stations is formed. In this way, the utilization rate of existing transformers is maximized, the utilization rate of equipment is improved, the safe operation capacity of equipment is improved, the workload of operation and inspection staff is reduced, the number of power outages and operation and inspection is reduced, and the power supply quality is improved. At the same time, the balanced distribution of the load density of transformers in the area is also conducive to the operation of transformers in the best economic operation state and the reduction of transformer losses.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites the preferred embodiments and describes them in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A load transfer intelligent switch system for a substation according to an embodiment of the present disclosure;

[0032] Figure 2 According to another embodiment of the present disclosure, the intelligent switch system for load transfer in a substation is provided, wherein the power supply network includes a plurality of substations, and any two substations are connected to a shared intelligent switching switch;

[0033] Figure 3 is a schematic diagram of a single-phase load transfer switch according to an embodiment of the present disclosure;

[0034] Figure 4 for Figure 3 A phase diagram of out-of-phase switching of a single-phase load transfer switch is shown;

[0035] Figure 5 A schematic diagram of a three-phase load transfer switch according to an embodiment of the present disclosure;

[0036] Figure 6 for Figure 5 A phase diagram of out-of-phase switching of a three-phase load transfer switch is shown;

[0037] Figure 7 is a structural diagram of an intelligent switching switch according to an embodiment of the present disclosure;

[0038] Figure 8 It is a flow chart of an intelligent switch method for load transfer in a substation according to an embodiment of the present disclosure;

[0039] Fig. 9 The present invention is a flow chart of a load transfer intelligent switch method for intelligently switching loads between substations according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0041] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0042] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0043] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0044] Example 1

[0045] In order to solve the technical problem of how to balance the load in the substation area, the following embodiment provides an intelligent switch system for substation load transfer. Figure 1 As shown, the intelligent switch system for load transfer in the substation includes: multiple substations T1 and T2, each substation includes at least one transformer for connecting one or more loads; an intelligent switching switch, which can switch between the transformer of the first substation T1 and the transformer of the second substation T2 in the multiple substations; wherein the intelligent switching switch connects the switchable loads;

[0046] The first substation T1 and the second substation T2 are respectively provided with substation load detection devices for detecting the load status of the transformers in the substations, and transmitting the load status to the intelligent switching switch;

[0047] The intelligent switching switch dynamically switches the switchable load connected to the intelligent switching switch from one of the first and second substations to another substation according to the load condition. The neutral lines of the transformers in the two substations can be directly connected, and the wiring methods of the connected transformers are the same.

[0048] In one embodiment, the load detection device in the substation in the system monitors the load operation status of the substation in real time, for example, load current, transformer capacity, instantaneous current of each phase, active power, reactive power, power factor and other power parameters. All parameters that can characterize the load characteristics can be monitored, and the monitoring technology belongs to the prior art and is not limited here. The monitored power parameters are sent to the intelligent switching switch.

[0049] In one embodiment, the communication between the above-mentioned substation load detection device and the intelligent switching switch can be either wired connection communication, such as using the existing power connection to achieve wired connection communication; or wireless connection communication, such as WIFI, Bluetooth, 4G, 5G and other wireless communication technologies, using existing wireless communication technologies to achieve communication and interconnection between the two, which is not limited here.

[0050] In one embodiment, after the intelligent switching switch receives the load operating conditions of the two connected substations, that is, the power parameters of the two substations, it determines whether the preset load switching conditions are met based on these power parameters, and performs load switching when the conditions are met. The preset load switching conditions are, for example, that the power parameters of one of the substations reflect that the load of the substation is greater than a given threshold, for example, the given threshold reflects the maximum allowable load, and the load of the other substation is less than the given threshold, then load switching is performed to switch the switchable load connected to the intelligent switching switch from the substation with a large load to the substation with a small load. Through this operation, the load density of the transformer in the substation is dynamically balanced, which is conducive to the transformer running in the best economic operating state and reducing transformer losses. There are many forms of specific preset load switching conditions to meet the dynamic adjustment of the load and facilitate load balancing between the two substations.

[0051] Example 2

[0052] In another embodiment, the power supply network includes a plurality of stations, such as Figure 2As shown, any two substations share a smart switching switch, which is connected to one or more switchable loads, receives the power parameters of the substation load operation status sent by the load detection device of the substation to which it is connected, and performs load switching condition judgment as described above. When the conditions are met, load switching is performed, thereby realizing dynamic load adjustment of the entire power supply network and load balancing of the power supply network.

[0053] In one embodiment, before performing load switching, the intelligent switching switch sends a switching permission request to the load detection device connected to the intelligent switching switch; after receiving the permission instructions replied by the two load detection devices, the load switching is performed; and the switching completion information is sent to the load detection device. Figure 1 As shown, the intelligent switching switch determines whether the preset load switching conditions are met based on the received power parameters of the substations T1 and T2. Before performing load switching when the conditions are met, a switching permission request is sent to the load detection devices of the substations T1 and T2 respectively; after receiving the permission instructions replied by the two load detection devices, the load switching is executed; and then the switching completion information is sent to the two load detection devices.

[0054] In one embodiment, the system further includes a household change identification device for storing load information of the substation, wherein the load information includes household change relations; after the load switching is completed, the household change identification device receives a household change relation reorganization instruction and performs information update. After the intelligent switching switch completes the load switching, the household change relation reorganization instruction is sent to the household change identification device so that the household change identification device performs information update.

[0055] In one embodiment, the structure of the intelligent switch is as follows: Figure 5As shown, it includes: a control unit, such as a CPU unit and / or a control logic circuit, for executing switching logic; a power supply unit, for supplying power to the intelligent switching switch, such as a dual power supply circuit; a communication unit, for communicating and connecting with an external device to transmit information, such as a Lora wireless communication unit for realizing wireless communication; a power main circuit unit, for switching the connected switchable load between the two connected substations; the power main circuit unit includes a switching control circuit, which is used to realize the switching connection of the switchable load on the phase lines of different transformers through the included thyristors and relays. Wherein, the control unit sends a switching instruction to the power main circuit unit according to the load conditions of the two connected substations, and in response to the switching instruction, the power main circuit unit dynamically switches the switchable load from one of the first substation and the second substation to the other substation. This intelligent switching switch is an important component of the substation load transfer intelligent switch system, which can realize 0 millisecond switching. In view of the switching requirements of three-phase load lines and single-phase lines in the power network, the intelligent switching switch realizes two types of switching:

[0056] 1. Single-phase load switching

[0057] A section of single-phase line load is controlled as a switchable load between two adjacent transformers, and any switching between the three phases A, B, and C of the two transformers can be realized. The main circuit of single-phase load switching power is as shown in the figure. The neutral lines N of the transformers in the two transformers are directly connected, and the connected transformers are connected in the same way.

[0058] In one embodiment, the switching control circuit of the intelligent switching switch dynamically switches the switchable load connected to it between any phases of the live wires L of the two transformers, that is, the switchable load can be switched to any one of the AC phases of the transformers in the two substations. Dynamic load regulation is achieved by real-time monitoring of the load operating status on any single phase of the AC phase of the transformers in the two substations.

[0059] In one embodiment, in-phase switching is achieved. Figure 3 As shown, since the neutral lines of the two transformers are directly connected and the connected transformers are connected in the same way, their phases are the same. When switching, the thyristors on both sides are controlled to be turned on at the zero crossing point, and then the currently connected relay is released, and the relay on the other side is attracted at the next zero crossing point. After 10 milliseconds, the thyristor trigger signal is turned off to complete the uninterrupted switching.

[0060] In one embodiment, out-of-phase switching is implemented. Figure 4 for Figure 3 The phase diagram of the out-of-phase switching of the single-phase load transfer switch is shown in FIG. Figure 3 and Figure 4As shown, taking the switching of the A phase of the T1 transformer belonging to different substations to the B phase of the T2 transformer in another substation as an example, at the zero-crossing point t1 of the transition from the negative half-cycle to the positive half-cycle of the A phase of the T1 transformer, its relay is released, and at the same time, the trigger signals of the SCR of the A phase of the T1 transformer and the B phase of the T2 transformer are issued. Since the SCR is a semi-controlled device, it is turned on when the voltage across its two ends is forward biased and turned off when it is reverse biased. Therefore, at this time, the thyristor of the A phase of the T1 transformer is turned on, and the thyristor of the B phase of the T2 transformer is turned off; at the zero-crossing point t2 of the L line voltage, since the B phase voltage is higher than the A phase voltage, the thyristor of the B phase of the T2 transformer is turned on, and the thyristor of the A phase of the T1 transformer is turned off, and the B phase of the T2 transformer has been switched to the B phase of the T2 transformer; then at the peak of the B phase of the T2 transformer, the B phase relay of the T2 transformer is energized, and the switching from the A phase of the T1 transformer to the B phase of the T2 transformer is completed, and the switching process has no interruption of power supply.

[0061] 2. Three-phase load switching

[0062] A three-phase load line is controlled as a switchable load between two stations to achieve the switching of A->A, B->B, and C->C. Figure 5 As shown, the neutral lines N of the two transformers are directly connected, and the connected transformers are connected in the same way. The switching control circuit of the intelligent switch dynamically switches the switchable load connected to it between the same phases of the live lines L of the two transformers, that is, phase A with phase A, phase B with phase B, and phase C with phase C. Dynamic load regulation is achieved by real-time monitoring of the load operating conditions on the three phases of the transformers in the two areas.

[0063] In one embodiment, when switching three-phase load lines, since the load may include three-phase motor-type equipment, the same-phase lines must be switched during switching to avoid motor reversal and power accidents. When the intelligent switch performs switching, it first determines whether the corresponding phases are in phase, otherwise the switching action is not performed. Figure 6 for Figure 5 The phase diagram of the out-of-phase switching of the three-phase load transfer switch is shown in FIG. Figure 5 and Figure 6 As shown in the figure, at the zero crossing of phase A of transformer T1, the contactor on the first connection side is released, and at the same time, the triggering signal of the thyristor of phase A of transformer T1 and phase A of transformer T2 is sent. The thyristor on the side with higher voltage on both sides is turned on, and the contactor on the other side is attracted at the peak voltage of phase A, thus completing the switching of phase A; the control sequence of phases B and C is similar, but each is started with a 120-degree delay, and the three-phase switching is completed after 13.33 milliseconds. The whole switching process is uninterrupted power supply.

[0064] In the above, although the corresponding structures in the embodiment of the substation load transfer intelligent switch system are described as above, those skilled in the art should be aware that on the basis of the above structure, those skilled in the art may also add other structures, and these obvious modifications or equivalent replacement methods should also be included in the protection scope of the present disclosure and will not be repeated here.

[0065] The following is an embodiment of the method disclosed herein. The embodiment of the method disclosed herein is implemented by the above-mentioned system executing the steps of the embodiment of the method disclosed herein. For the sake of ease of explanation, only the parts related to the embodiment of the method disclosed herein are shown. For specific technical details not disclosed, please refer to the embodiment of the system disclosed herein.

[0066] Example 3

[0067] In order to solve the technical problem of how to balance the load of the substation area. Figure 8 As shown, an intelligent switching method for load transfer in a substation is provided.

[0068] A method for intelligent switching of load transfer in a substation, comprising: realizing dynamic switching of a switchable load by switching a transformer connected to a first substation and a transformer connected to a second substation through an intelligent switching switch; arranging substation load detection devices in the first substation and the second substation respectively, detecting the load conditions of the transformers in each of the first substation and the second substation respectively; transmitting the load conditions to the intelligent switching switch; and dynamically switching the switchable load connected to the intelligent switching switch from one of the first substation and the second substation to another substation according to the load conditions.

[0069] In one embodiment, Figure 1 As shown, the intelligent switching switch can switch the transformer connected to the first substation T1 and the transformer connected to the second substation T2, so as to realize dynamic switching of the switchable load between substations T1 and T2; wherein the load detection device of substation T1 detects the load condition of the transformer of the first substation T1, and the load detection device of substation T2 detects the load condition of the transformer of the first substation T2; the two load detection devices transmit the load condition to the intelligent switching switch; the intelligent switching switch dynamically switches the switchable load connected to the intelligent switching switch from one of the first substation T1 and the second substation T2 to the other substation according to the load condition.

[0070] In one embodiment, after the intelligent switching switch receives the load operating conditions of the two connected substations, that is, the power parameters of the two substations, it determines whether the preset load switching conditions are met based on these power parameters, and performs load switching when the conditions are met. The preset load switching conditions are, for example, that the power parameters of one of the substations reflect that the load of the substation is greater than a given threshold, for example, the given threshold reflects the maximum allowable load, and the load of the other substation is less than the given threshold, then load switching is performed to switch the switchable load connected to the intelligent switching switch from the substation with a large load to the substation with a small load. Through this operation, the load density of the transformer in the substation is dynamically balanced, which is conducive to the transformer running in the best economic operating state and reducing transformer losses. There are many forms of specific preset load switching conditions to meet the dynamic adjustment of the load and facilitate load balancing between the two substations.

[0071] In one embodiment, Figure 2 As shown, the power supply network includes multiple substations, and any two substations share a smart switching switch, implementing a substation load transfer smart switching method on the entire power supply network. The smart switching switch is connected to one or more switchable loads, receives power parameters of the substation load operating status sent by the load detection device of the connected substation, and performs load switching condition judgment as described above. When the conditions are met, load switching is performed, thereby realizing dynamic load adjustment of the entire power supply network and load balancing of the power supply network.

[0072] In one embodiment, before performing load switching, the intelligent switching switch sends a switching permission request to the load detection device connected to the intelligent switching switch; after receiving the permission instructions replied by the two load detection devices, the load switching is performed; and the switching completion information is sent to the load detection device. Figure 1 As shown, the intelligent switching switch determines whether the preset load switching conditions are met based on the received power parameters of the substations T1 and T2. Before performing load switching when the conditions are met, a switching permission request is sent to the load detection devices of the substations T1 and T2 respectively; after receiving the permission instructions replied by the two load detection devices, the load switching is executed; and then the switching completion information is sent to the two load detection devices.

[0073] In one embodiment, the system further includes a household change identification device for storing load information of the substation, wherein the load information includes household change relationships; the method further includes sending a household change relationship reorganization instruction to the household change identification device after the intelligent switching switch completes the load switching, so that the household change identification device can update the information.

[0074] In one embodiment, a method for intelligently switching a switch is provided, such as Figure 7As shown, it is used for intelligent load switching between stations, wherein the intelligent switching switch, such as Figure 5 As shown, it includes the same structure, and the implementation method includes: according to the load conditions of the first substation and the second substation, the controller of the intelligent switching switch sends a switching instruction to the power main circuit unit, and in response to the switching instruction, the power main circuit unit dynamically switches the switchable load from one of the first substation and the second substation to the other substation.

[0075] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0076] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including," "comprising," "having," and the like are open words, referring to "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0077] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0078] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0079] Various changes, substitutions, and modifications of the techniques described herein may be made without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods, or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or actions within their scope.

[0080] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0081] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. An intelligent switch system for load transfer in a substation, characterized in that: The system comprises: A plurality of substations, each substation comprising at least one transformer for connecting one or more loads; An intelligent switching switch, wherein the intelligent switching switch can switch between a transformer connected to a first transformer area and a transformer connected to a second transformer area among the plurality of transformer areas; wherein the intelligent switching switch is connected to a switchable load; The first substation and the second substation are respectively provided with substation load detection devices for detecting the load status of the transformer in the substation and transmitting the load status to the intelligent switching switch; The intelligent switching switch dynamically switches the switchable load connected to the intelligent switching switch from one of the first and second stations to another station area according to the load condition; The intelligent switching switch includes a control unit for executing switching logic; a power supply unit for supplying power to the intelligent switching switch; a communication unit for communicating with an external device and transmitting information; and a power main circuit unit for switching the connected switchable load between the first station area and the second station area. The power main circuit unit includes a thyristor and a relay, which are used to realize the switching; The intelligent switching switch realizes two types of switching, including single-phase load switching and three-phase load switching; The single-phase load switching includes same-phase switching and different-phase switching. The specific implementation of the same-phase switching is: when switching, the thyristors on both sides are controlled to be turned on at the zero crossing point, and then the currently connected relay is released, and the relay on the other side is attracted at the next zero crossing point, and the thyristor trigger signal is turned off after 10 milliseconds to complete the uninterrupted switching; The out-of-phase switching is specifically implemented as follows: at the zero-crossing point t1 when the negative half-cycle of the A phase of the T1 transformer in the first area transitions to the positive half-cycle, the relay is released, and at the same time, a trigger signal of the SCR of the A phase of the T1 transformer in the first area and the B phase of the T2 transformer in the second area is issued. Since the SCR is a semi-controlled device, it is turned on when the voltage across its two ends is forward biased and turned off when it is reverse biased. Therefore, at this time, the A phase thyristor of the T1 transformer is turned on, and the B phase thyristor of the T2 transformer is turned off; at the zero-crossing point t2 of the L line voltage, since the B phase voltage is higher than the A phase voltage, the B phase thyristor of the T2 transformer is turned on, and the A phase thyristor of the T1 transformer is turned off, and the B phase of the T2 transformer has been switched to the B phase of the T2 transformer; then, at the peak of the B phase of the T2 transformer, the B phase relay of the T2 transformer is energized, and the switching from the A phase of the T1 transformer to the B phase of the T2 transformer is completed, and the switching process has no interruption of power supply; When the three-phase load is switched, the intelligent switching switch must first determine whether the corresponding phases are in phase, otherwise the switching action will not be performed; the specific implementation of the three-phase load switching is: at the zero crossing point of phase A of the T1 transformer, the contactor on the currently connected side is released, and at the same time, the thyristor trigger signals of phase A of the T1 transformer and phase A of the T2 transformer are issued, and the thyristor on the side with higher voltage on both sides is turned on, and the contactor on the other side is attracted at the peak voltage of phase A, thereby completing the switching of phase A; the control sequence of phases B and C is similar to this, except that each is started with a 120-degree lag, and the three-phase switching is completed after 13.33 milliseconds, and the power supply is uninterrupted during the entire switching process.

2. The intelligent switch system for load transfer in a substation as described in claim 1, wherein the load condition includes any item of the load current, the instantaneous current of each phase in the substation, active power, reactive power or power factor.

3. The intelligent switch system for load transfer in a substation as described in claim 1, wherein the intelligent switching switch determines whether a preset load switching condition is met based on the received load condition, and performs load switching if the condition is met.

4. The intelligent switch system for load transfer in a substation as described in claim 3, wherein the load switching condition includes that the load of the first substation currently connected is greater than a first threshold, and the load of the second substation is less than a second threshold.

5. The intelligent switch system for load transfer in a substation as described in claim 1, wherein before the intelligent switching switch performs load switching, it sends a switching permission request to two load detection devices connected to the intelligent switching switch; after receiving the permission instructions replied by the two load detection devices, it executes the load switching; and it sends switching completion information to the two load detection devices.

6. The intelligent switch system for load transfer in a substation as described in claim 1, wherein the system further comprises a household transformer identification device for storing load information of the substation, wherein the load information comprises household transformer relationships; after the load switching is completed, the household transformer identification device receives a household transformer relationship reorganization instruction and performs information update.

7. An intelligent switching switch for intelligent load switching between stations, characterized in that include: a control unit for executing a switching logic; A power supply unit, used to supply power to the intelligent switch; A communication unit, used for communicating with an external device and transmitting information; A power main circuit unit, used for switching the connected switchable load between the first station area and the second station area; The control unit sends a switching instruction to the power main circuit unit according to the load conditions of the first and second substations, and in response to the switching instruction, the power main circuit unit dynamically switches the switchable load from one of the first and second substations to the other substation; The power main circuit unit includes a thyristor and a relay, which are used to realize the switching; The intelligent switching switch realizes two types of switching, including single-phase load switching and three-phase load switching; The single-phase load switching includes same-phase switching and different-phase switching. The specific implementation of the same-phase switching is: when switching, the thyristors on both sides are controlled to be turned on at the zero crossing point, and then the currently connected relay is released, and the relay on the other side is attracted at the next zero crossing point, and the thyristor trigger signal is turned off after 10 milliseconds to complete the uninterrupted switching; The out-of-phase switching is specifically implemented as follows: at the zero-crossing point t1 of the transition from the negative half-cycle to the positive half-cycle of the phase of the T1 transformer A in the first station area, its relay is released, and at the same time, a trigger signal of the SCR of the phase A of the T1 transformer in the first station area and the phase B of the T2 transformer in the second station area is issued. Since the SCR is a semi-controlled device, it is turned on when the voltage across its two ends is forward biased and turned off when it is reverse biased. Therefore, at this time, the thyristor of the phase A of the T1 transformer is turned on, and the thyristor of the phase B of the T2 transformer is turned off; at the zero-crossing point t2 of the L line voltage, since the voltage of the phase B is higher than the voltage of the phase A, the thyristor of the phase B of the T2 transformer is turned on, and the thyristor of the phase A of the T1 transformer is turned off, and the B phase of the T2 transformer has been switched to the B phase of the T2 transformer; then, at the peak of the phase B of the T2 transformer, the phase B relay of the T2 transformer is energized, and the switching from the phase A of the T1 transformer to the phase B of the T2 transformer is completed, and the switching process has no interruption of power supply; When the three-phase load is switched, the intelligent switching switch must first determine whether the corresponding phases are in phase, otherwise the switching action will not be performed; the specific implementation of the three-phase load switching is: at the zero crossing point of phase A of the T1 transformer, the contactor on the currently connected side is released, and at the same time, the thyristor trigger signals of phase A of the T1 transformer and phase A of the T2 transformer are issued, and the thyristor on the side with higher voltage on both sides is turned on, and the contactor on the other side is attracted at the peak voltage of phase A, thereby completing the switching of phase A; the control sequence of phases B and C is similar to this, except that each is started with a 120-degree lag, and the three-phase switching is completed after 13.33 milliseconds, and the power supply is uninterrupted during the entire switching process.

8. An intelligent switching method for load transfer in a substation, characterized in that: include: The transformer connected to the first transformer area and the transformer connected to the second transformer area can be switched through the intelligent switching switch to achieve dynamic switching of the switchable load; The first transformer area and the second transformer area are provided with transformer area load detection devices respectively to detect the load condition of the transformer in each transformer area of ​​the first transformer area and the second transformer area respectively; transmitting the load condition to the intelligent switching switch; The intelligent switching switch dynamically switches the switchable load connected to the intelligent switching switch from one of the first and second stations to another station area according to the load condition; Wherein, the intelligent switching switch comprises a power main circuit unit, and the power main circuit unit comprises a thyristor and a relay, which are used to realize the switching; The intelligent switching switch realizes two types of switching, including single-phase load switching and three-phase load switching; The single-phase load switching includes same-phase switching and different-phase switching. The specific implementation of the same-phase switching is: when switching, the thyristors on both sides are controlled to be turned on at the zero crossing point, and then the currently connected relay is released, and the relay on the other side is attracted at the next zero crossing point, and the thyristor trigger signal is turned off after 10 milliseconds to complete the uninterrupted switching; The out-of-phase switching is specifically implemented as follows: at the zero-crossing point t1 of the transition from the negative half-cycle to the positive half-cycle of the phase of the T1 transformer A in the first station area, its relay is released, and at the same time, a trigger signal of the SCR of the phase A of the T1 transformer in the first station area and the phase B of the T2 transformer in the second station area is issued. Since the SCR is a semi-controlled device, it is turned on when the voltage across its two ends is forward biased and turned off when it is reverse biased. Therefore, at this time, the thyristor of the phase A of the T1 transformer is turned on, and the thyristor of the phase B of the T2 transformer is turned off; at the zero-crossing point t2 of the L line voltage, since the voltage of the phase B is higher than the voltage of the phase A, the thyristor of the phase B of the T2 transformer is turned on, and the thyristor of the phase A of the T1 transformer is turned off, and the B phase of the T2 transformer has been switched to the B phase of the T2 transformer; then, at the peak of the phase B of the T2 transformer, the phase B relay of the T2 transformer is energized, and the switching from the phase A of the T1 transformer to the phase B of the T2 transformer is completed, and the switching process has no interruption of power supply; When the three-phase load is switched, the intelligent switching switch must first determine whether the corresponding phases are in phase, otherwise the switching action will not be performed; the specific implementation of the three-phase load switching is: at the zero crossing point of phase A of the T1 transformer, the contactor on the currently connected side is released, and at the same time, the thyristor trigger signals of phase A of the T1 transformer and phase A of the T2 transformer are issued, and the thyristor on the side with higher voltage on both sides is turned on, and the contactor on the other side is attracted at the peak voltage of phase A, thereby completing the switching of phase A; the control sequence of phases B and C is similar to this, except that each is started with a 120-degree lag, and the three-phase switching is completed after 13.33 milliseconds, and the power supply is uninterrupted during the entire switching process.

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