Spare power automatic switching load control method and device for double-circuit overhead line and electronic equipment

Abstract

The invention discloses a spare power automatic switching load control method and device for a double-circuit overhead line and electronic equipment. The method comprises the steps that under the condition that a faulty line exists in the double-circuit overhead line, spare power automatic switching processing is adopted for the faulty line, and spare power automatic switching adopts an operation line, except the faulty line, in the double-circuit overhead line to carry out power supply processing on loads included in the faulty line; determining a load rate after the operation line performs power supply on the fault line; determining a load control strategy of the operation line based on the load rate; and carrying out load adjustment on the operation line by adopting a load control strategy until the adjusted load rate is smaller than a load threshold value. According to the invention, the technical problem that the load control effect of the operation line is not ideal after the spare power automatic switching processing is carried out on the double-circuit overhead line in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of power systems and automation technologies, and in particular to a method, device and electronic equipment for controlling a backup automatic load of a double-circuit overhead line. Background Art

[0002] With the development of the power system and the continuous growth of power load. After the load of the power failure line is transferred to the operating line where the power supply is not faulty through the standby automatic transfer, it is easy to overload the load of the operating line, causing the temperature of the system's electrical equipment to rise, accelerating the aging of the equipment, and even causing the decomposition of the insulation material of the equipment and the deformation of the metal parts, which eventually causes equipment damage or failure. Therefore, after starting the standby automatic transfer, it is necessary to control the load of the operating line to avoid load overload. In the related art, the load control of the operating line mainly adopts manual adjustment and uses the automatic load control device to adjust the load. Manual adjustment relies on manual judgment for accuracy, and the efficiency is relatively low, and it may not respond in time in an emergency. When the automatic load control device detects a load overload, it will automatically disconnect some interruptible loads, but the way to reduce the load is single, resulting in low flexibility of load control, and it is impossible to distinguish the importance of different loads, and the accuracy of load control is low. In summary, there is a problem in the related art that the load control effect of the operating line of the double-circuit overhead line is not ideal.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present application provide a method, device and electronic equipment for controlling the backup automatic switching load of a double-circuit overhead line, so as to at least solve the technical problem in the related art that the load control effect of the operating line of the double-circuit overhead line after the backup automatic switching process is not ideal.

[0005] According to one aspect of an embodiment of the present application, a method for controlling a double-circuit overhead line load with a backup automatic switch is provided, comprising: in the event that a fault line exists in the double-circuit overhead line, the fault line is subjected to backup automatic switch processing, wherein the backup automatic switch is to use an operating line in the double-circuit overhead line except for the fault line to perform power supply processing on the load included in the fault line; determining a load rate after the operating line supplies power to the fault line; determining a load control strategy for the operating line based on the load rate; and adjusting the load of the operating line using the load control strategy until the adjusted load rate is less than a load threshold.

[0006] Optionally, determining the load rate after the operating line supplies power to the fault line includes: determining current information after the operating line supplies power to the fault line, and the rated current of the operating line; based on the current information and the rated current, determining the load rate after the operating line supplies power to the fault line.

[0007] Optionally, determining the load control strategy of the operating line includes: determining a load control order for multiple loads on the operating line; determining sub-strategies corresponding to the multiple loads according to the adjustment capabilities and response speeds corresponding to the multiple loads; and integrating the sub-strategies corresponding to the multiple loads using the load control order to determine the load control strategy.

[0008] Optionally, the sub-strategies corresponding to the multiple loads include a load shedding strategy and a power limiting strategy. The load shedding strategy is to disconnect the corresponding load from the operating line, and the power limiting strategy is to limit the maximum power of the corresponding load.

[0009] Optionally, determining a load control order for a plurality of loads on an operating line includes: determining risk levels, load types and load distributions corresponding to the loads on the operating line; and determining a load control order for a plurality of loads on the operating line based on risk levels, load types and load distributions corresponding to the loads on the operating line.

[0010] Optionally, determining the load control strategy of the operating line includes: determining the predicted load rate of the operating line based on predicted weather information and historical electricity consumption data of the area where the operating line is located; determining the predetermined spare capacity of the operating line based on the predicted load rate; and determining the load control strategy of the operating line according to the predetermined spare capacity.

[0011] Optionally, the method also includes: determining the carrying capacity, thermal stability coefficient, and temperature data of the area where the operating line is located, wherein the thermal stability coefficient represents the ability of the operating line to remain stable under overload conditions; and determining the load threshold of the operating line based on the carrying capacity, thermal stability coefficient, and temperature data.

[0012] According to another aspect of an embodiment of the present application, a backup automatic switching load control device for a double-circuit overhead line is provided, comprising: a backup automatic switching module, which, when a fault line exists in the double-circuit overhead line, adopts backup automatic switching to process the fault line, wherein the backup automatic switching is to adopt the operating line of the double-circuit overhead line except the fault line to power the load included in the fault line; a load rate determination module, which is used to determine the load rate after the operating line supplies power to the fault line; a load control strategy determination module, which is used to determine the load control strategy of the operating line based on the load rate; and a load adjustment module, which is used to adopt the load control strategy to adjust the load of the operating line until the adjusted load rate is less than a load threshold.

[0013] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executing any one of the methods for controlling the backup automatic load of a double-circuit overhead line.

[0014] According to another aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by one or more processors, the one or more processors implement any one of the methods for controlling backup automatic loads of a double-circuit overhead line.

[0015] In the embodiment of the present application, when there is a fault line in the double-circuit overhead line, the fault line is processed by using a standby automatic re-entry, wherein the standby automatic re-entry is to use the operating line in the double-circuit overhead line except the fault line to power the load included in the fault line; determine the load rate after the operating line supplies power to the fault line; determine the load control strategy of the operating line based on the load rate; and use the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold. The purpose of adjusting the load of the operating line based on the load control sequence and using the load control strategy to avoid load overload of the operating line is achieved, and the technical effect of improving the accuracy and efficiency of load control of the operating line after the standby automatic re-entry process is started on the double-circuit overhead line is achieved, thereby solving the technical problem of unsatisfactory load control effect of the operating line of the double-circuit overhead line after the standby automatic re-entry process in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a flow chart of an optional automatic load control method for a double-circuit overhead line provided according to an embodiment of the present application;

[0018] Figure 2 It is a model diagram of an optional automatic load control method for a double-circuit overhead line provided in an embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of an optional automatic load control method for a double-circuit overhead line provided according to an embodiment of the present application;

[0020] Figure 4 It is a structural diagram of an optional automatic load control method for a double-circuit overhead line provided according to an embodiment of the present application;

[0021] Figure 5 It is a schematic diagram of an optional automatic load control device for a double-circuit overhead line provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0025] Automatic Standby Power Supply System (ASPS) refers to the automatic and rapid switching to the backup power supply when the main power supply fails, ensuring the continuous operation of important equipment or systems.

[0026] N-1 failure means that when any single component in the power network (for example, a transmission line, a generator, a transformer or a circuit breaker, etc.) fails or is shut down, the remaining N-1 components can still ensure the normal power supply of the power system and meet all load requirements without causing system collapse or overload of other components. Here "N" represents the total number of components in the power system.

[0027] According to an embodiment of the present application, a method embodiment of a method for controlling a backup automatic load of a double-circuit overhead line is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0028] Figure 1is a flow chart of an optional automatic load control method for a double-circuit overhead line according to an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0029] Step S102, when there is a fault line in the double-circuit overhead line, the fault line is processed by automatic switching of the backup power supply, wherein the automatic switching of the backup power supply is to use the operating line of the double-circuit overhead line except the fault line to supply power to the load included in the fault line;

[0030] It can be understood that for double-circuit overhead lines, if a fault line is detected in the double-circuit overhead lines, the fault line is automatically switched to standby mode, and then the power supply of the remaining operating lines in the double-circuit overhead lines except the fault line is used to supply power to the load of the fault line. The power supply of the remaining operating lines is used to supply power to the load of the fault line, which ensures the continuous power supply of the load, reduces the scope of power outage, and improves the power supply reliability of the power system.

[0031] Optionally, Figure 2 is a model diagram of an optional double-circuit overhead line backup automatic load control method provided in an embodiment of the present application. Figure 2 The double-circuit overhead line 110kV (kilovolt) substation shown needs to detect the current and voltage of the line in real time to determine whether there is a faulty line. Among them, 110kV4# and 110kV5# are two busbars, 112 refers to the incoming circuit breaker of the 110kV4# busbar, 113 refers to the incoming circuit breaker of the 110kV5# busbar, 101 refers to the high-voltage side circuit breaker of the No. 1 transformer, 102 refers to the high-voltage side circuit breaker of the No. 2 transformer, 145 refers to the bus tie switch, 1# is the transformer on the 110kV4# busbar side (i.e., No. 1 transformer), 2# is the 110kV5# busbar side, and 101 refers to the high-voltage side circuit breaker of the No. 1 transformer. The transformer on the kV5# bus side (i.e. transformer No. 2), 10kV3A#, 10kV3B#, 10kV4A# and 10kV4B# refer to busbars with a voltage level of 10kV. 201A and 201B are both low-voltage side circuit breakers of transformer No. 1, 202A and 202B are both low-voltage side circuit breakers of transformer No. 2, and 211~227 are circuit breakers (i.e. switches) that control loads connected to the 10kv busbar.

[0032] Real-time detection of 110kV and 10kV bus voltage values ​​of 110kV substation, including 110kV4# bus voltage U1 and 110kV5# bus voltage U2, 10kV3A# bus voltage U3A and 10kV3B# bus voltage U3B (if the 10kV side is a single bus, it is 10kV3# bus voltage U3), 10kV4A# bus voltage U4A and 10kV4B# bus voltage U4B (if the 10kV side is a single bus, it is 10kV4# bus voltage U4), and the current values ​​of each incoming line of 110kV bus: 4# bus incoming line current I1 and 5# bus incoming line current I2. When any of the double-circuit incoming power supply of the 110kV substation fails, it is detected that the 110kV4# bus voltage U1, and the 10kV3A# bus voltage U3A or 10kV3B# bus voltage U3B (if the 10kV side is a single bus, it is 10kV3# bus voltage U3) lose voltage to 0; or the 110kV5# bus voltage U2, and the 10kV4A# bus voltage U4A or 10kV4B# bus voltage U4B (if the 10kV side is a single bus, it is 10kV4# bus voltage U4) lose voltage to 0, the standby automatic start-up will automatically start, trip the corresponding bus incoming line switch, and close the bus tie switch.

[0033] Step S104, determining the load rate after the operating line supplies power to the faulty line;

[0034] It is understandable that after the load of the fault line is distributed to the operating line, the load of the operating line may be overloaded, which in turn affects the safe and stable operation of the fault line. Therefore, after the operating line supplies power to the fault line, it is necessary to determine the load rate of the operating line and judge whether the load of the operating line is overloaded. By judging the load status of the operating line, problems caused by overload of the operating line can be avoided, thereby improving the operational stability and power supply reliability of the power system.

[0035] In an optional embodiment, determining the load rate of the operating line after supplying power to the fault line includes: determining current information after the operating line supplies power to the fault line, and the rated current of the operating line; based on the current information and the rated current, determining the load rate of the operating line after supplying power to the fault line.

[0036] It can be understood that after the operating line supplies power to the faulty line, the current information of the operating line and the rated current of the operating line are detected. Based on the above current information and the rated current, the load rate of the operating line after the faulty line is supplied with power is obtained to determine whether there is a load overload problem (i.e., the load rate is greater than or equal to the load threshold) on the operating line. By collecting current in real time and combining it with the rated current of the operating line, the load rate of the operating line after power supply can be calculated more accurately, providing a reliable basis for subsequent load adjustment.

[0037] Optionally, for Figure 2 For the double-circuit overhead line 110kV (kilovolt) substation shown, after the backup automatic start, calculate the load rate of the operating line after the backup automatic start of the double-circuit line N-1 fault closes the bus tie switch. If the 4# bus is the operating line, the load rate is: 4# bus incoming line current I1 / line rated current I; if the 5# bus is the operating line, the load rate is: 5# bus incoming line current I2 / line rated current I.

[0038] Step S106, determining a load control strategy for the operating line based on the load rate;

[0039] It can be understood that the load control strategy of the operating line is determined according to the load rate of the operating line, and the load control strategy is adopted to control the load of the operating line. Through the load control strategy based on the load rate, the overload of the operating line can be effectively avoided, the risk of damage to the line and equipment can be reduced, the voltage and frequency of the power system can be maintained stable, the power supply quality can be improved, and the impact on important loads (such as data centers) can be reduced.

[0040] Optionally, determine if Figure 2 After determining the load rate of the operating line of the double-circuit overhead line 110kV (kilovolt) substation shown in FIG. 1 , it is necessary to determine whether the load on the operating line is overloaded, that is, whether the load rate of the operating line is greater than or equal to the load threshold of the operating line. Figure 2 The double-circuit overhead line 110kV (kilovolt) substation shown, if the load threshold of its double-circuit bus is 120%, then it is determined whether the load rate of the operating line is greater than or equal to 120% after the double-circuit line N-1 fault backup automatic start-up closes the bus tie switch. If it is greater than or equal to 120%, it is necessary to perform load control on the operating line.

[0041] In an optional embodiment, determining the load control strategy of an operating line includes: determining a load control order for multiple loads on the operating line; determining sub-strategies corresponding to the multiple loads according to the adjustment capabilities and response speeds corresponding to the multiple loads; and integrating the sub-strategies corresponding to the multiple loads using the load control order to determine the load control strategy.

[0042] It can be understood that there are multiple loads on the operating line. In order to determine the load control strategy of the operating line, it is first necessary to determine the load control order of multiple loads on the operating line. Determine the regulation capability and response speed of each load, and determine the sub-strategy for load control of each load based on the above regulation capability and response speed, such as load shedding strategy and power limitation strategy. Integrate the determined load control order with the sub-strategy of each load to form an overall load control strategy, that is, the load control strategy of the operating line. By assigning different sub-strategies to different loads, the load can be adjusted more flexibly to avoid the negative impact that may be caused by a one-size-fits-all load control method. At the same time, the integrated load control strategy can ensure the reasonable allocation of power resources, give priority to the power supply of key loads, and automatically adjust the power supply of secondary loads to avoid overloading of the operating line, thereby improving the overall operation efficiency and stability of the power system.

[0043] Optionally, the regulation capability of a load refers to the ability of an electric load to adjust according to the needs of an operating line. When an operating line needs to reduce its load (such as during peak hours of the power grid), a load with a high regulation capability can quickly respond to dispatch instructions and reduce its power consumption. Similarly, when an operating line needs to increase its load (such as during periods of high wind or solar power generation), a load with a high regulation capability can also quickly increase power consumption to help balance power supply and demand. Response speed refers to the response time of a load to a control instruction of an operating line. A load with a fast response speed can adjust its power consumption within seconds to minutes, which is critical for handling emergencies (such as line failures, generator outages, etc.).

[0044] In an optional embodiment, the sub-strategies corresponding to the multiple loads include a load shedding strategy and a power limiting strategy. The load shedding strategy is to disconnect the corresponding load from the operating line, and the power limiting strategy is to limit the maximum power of the corresponding load.

[0045] It can be understood that the sub-strategies for controlling the load of the operating line include load shedding strategy and power limiting strategy. The load shedding strategy refers to disconnecting the load from the operating line according to the load control sequence. The power limiting strategy refers to limiting the maximum power that the operating line can provide to the load to reduce its power demand for the operating line. By implementing the load shedding strategy and the power limiting strategy, the overload of the operating line can be effectively avoided, the excessive temperature rise of the line and the damage to the equipment can be prevented, thereby improving the overall stability and safety of the power system.

[0046] In an optional embodiment, determining a load control order for a plurality of loads on an operating line includes: determining risk levels, load types, and load distributions corresponding to the loads on the operating line; and determining a load control order for a plurality of loads on the operating line based on risk levels, load types, and load distributions corresponding to the loads on the operating line.

[0047] It can be understood that in order to control multiple loads on the operating line, it is first necessary to determine the load control order of the multiple loads. By determining the risk level, load type and load distribution corresponding to the multiple loads on the operating line, and according to the risk level, load type and load distribution corresponding to the multiple loads, the load control order of the multiple loads on the operating line during load control is determined. By determining the control order of multiple loads, accurate load control can be performed when a load overload occurs on the operating line, avoiding unnecessary load losses and excessive wear of power equipment, reducing the adverse effects caused by load overload, and improving the stability and operating efficiency of the power system.

[0048] Optionally, in order to determine the load control order of multiple loads, it is first necessary to conduct a risk assessment of the loads on the operating lines, and divide the loads into different risk levels according to their impact on the safe and stable operation of the power system. Secondly, the loads on the operating lines are classified by type, such as interruptible loads, non-interruptible loads, industrial loads, and residential loads. Then, the distribution of loads in the power network is determined, and then the geographical priority during load adjustment is determined to avoid new local overloads during the load adjustment process. The risk level, load type, and load distribution corresponding to multiple loads are combined to determine the load control order of multiple loads on the operating line. Determining the risk level, type, and distribution of loads on the operating line will help the power system to manage the loads in a refined manner, improve the stability and security of the power grid, optimize the allocation and utilization of power resources, and respond quickly in the event of a fault to ensure the power supply of key users and facilities.

[0049] In an optional embodiment, determining the load control strategy of an operating line includes: determining a predicted load rate of the operating line based on predicted weather information and historical electricity consumption data of an area where the operating line is located; determining a predetermined spare capacity of the operating line based on the predicted load rate; and determining the load control strategy of the operating line based on the predetermined spare capacity.

[0050] It can be understood that in order to further optimize the formulation of the load control strategy of the operating line, the predicted load rate of the operating line can be predicted based on the predicted weather information and historical electricity consumption data of the area where the operating line is located. Among them, the predicted weather information such as temperature, humidity, wind speed, etc. have a direct impact on the electricity demand, and the historical electricity consumption data such as the change in electricity consumption under different weather conditions. According to the predicted load rate, the predetermined spare capacity of the operating line is determined. Based on the above-mentioned predetermined spare capacity, the load control strategy of the operating line is determined. By combining the predicted weather information and historical electricity consumption data, the system can more accurately predict future load demand and provide more reliable data support for the formulation of the load control strategy. At the same time, the load control strategy based on the predetermined spare capacity can manage the load more accurately, avoid unnecessary load losses, and ensure the safe operation of the power system when the load demand surges.

[0051] Step S108: adopt a load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold.

[0052] It can be understood that when the load rate of the operating line is greater than or equal to the load threshold of the operating line, it is necessary to use the load control strategy of the operating line to adjust the load of the operating line until the load rate of the operating line is less than the load threshold. Through the above process, accurate and efficient load adjustment can be performed after the operating line is overloaded, ensuring the safe operation of the power system and improving the stability and power supply reliability of the power system.

[0053] Optionally, for Figure 2 For the double-circuit overhead line 110kV (kilovolt) substation shown, if the load rate of the operating line is greater than or equal to 120%, the load needs to be controlled by the precise load control module. The load of an entire line can be automatically cut off in sequence according to the load importance and the line pulling sequence (i.e. the load control sequence). The above-mentioned line pulling sequence is sorted from low to high according to the load importance. By inputting the line pulling sequence into the precise load control module, the precise load control module will give priority to cutting off the load with low load importance. For example, Figure 2 In the double-circuit overhead line 110kV (kilovolt) substation shown, the precise load control module can automatically select and open the 10kV line switches in sequence according to the line pulling sequence, so that the load rate of the operating line in the 110kV busbar incoming line can quickly drop to below 120%.

[0054] In an optional embodiment, the method also includes: determining the carrying capacity, thermal stability coefficient, and temperature data of the area where the operating line is located, wherein the thermal stability coefficient represents the ability of the operating line to remain stable under overload conditions; and determining the load threshold of the operating line based on the carrying capacity, thermal stability coefficient, and temperature data.

[0055] It can be understood that in order to determine the load threshold of the operating line, it is first necessary to determine the carrying capacity and thermal stability coefficient of the operating line, as well as the temperature data of the area where the operating line is located. Among them, the above-mentioned carrying capacity refers to the maximum current or power that the operating line can safely transmit under normal operating conditions; the thermal stability coefficient refers to the ability of the operating line to maintain stable operation without damage under overload conditions. Determine the load threshold of the operating line based on the carrying capacity and thermal stability coefficient of the operating line, as well as the temperature data of the area where the operating line is located. Dynamically determining the load threshold based on real-time temperature data and the thermal stability coefficient of the line can effectively avoid overload operation of the line under high temperature or unfavorable conditions, and prevent equipment damage and system stability problems caused by excessive line temperature rise. At the same time, by determining the carrying capacity and thermal stability coefficient, the capacity of the operating line can be more reasonably utilized, avoiding unnecessary load losses and improving the operating efficiency of the power system.

[0056] Through the above step S102, when there is a fault line in the double-circuit overhead line, the fault line is processed by the standby automatic switching, wherein the standby automatic switching is to use the operating line in the double-circuit overhead line except the fault line to power the load included in the fault line; step S104, determine the load rate after the operating line performs power supply to the fault line; step S106, based on the load rate, determine the load control strategy of the operating line; step S108, adopt the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold. The purpose of load control sequence based on the load control strategy to adjust the load of the operating line to avoid load overload of the operating line can be achieved, and the technical effect of improving the accuracy and efficiency of load control of the operating line after the standby automatic switching of the double-circuit overhead line is achieved, thereby solving the technical problem of unsatisfactory load control effect of the operating line of the double-circuit overhead line after the standby automatic switching is performed in the related art.

[0057] Based on the above embodiments and optional embodiments, the present application proposes an optional implementation mode. By using the embodiments of the present application, a standby automatic operation method based on precise load control can be proposed. By using this method, Figure 2 The double-circuit overhead line 110kV (kilovolt) substation shown performs precise load control on the remaining operating lines after executing the standby automatic switching.

[0058] With the development of society, the power load continues to grow, and the probability of N-1 failure in the transmission line increases. In order to improve the reliability of power supply, the load station with double-circuit incoming lines is usually equipped with a bus tie backup automatic switch. If a single-circuit incoming line fails, the bus tie backup automatic switch will start to close the bus tie switch, thereby ensuring that the entire station does not stop power and improving power supply reliability.

[0059] However, with the increase of power load, after the load of the faulty power line (i.e., the faulty line) is transferred to the line under the unfaulted power source (i.e., the operating line) through the backup automatic switch, if the load rate of the operating line exceeds the load threshold, for example, 120%, it is a serious overload, and the dispatcher needs to strengthen the detection and prejudgment, and notify the substation operation and maintenance personnel in advance to immediately go to the site to pull the backup automatic switch on the spot to prevent the backup automatic switch from starting after the double-circuit line N-1 fails, closing the mother switch, causing the operating line to be seriously overloaded, burning the line and other power equipment, thereby causing unstable operation of the power system; on the contrary, when the load rate drops and reaches the specified threshold, the dispatcher needs to notify the substation operation and maintenance personnel to go to the site again to activate the backup automatic switch. Not only does it increase manual labor and waste a lot of human resources, but the deactivation of the backup automatic switch will cause the load carried by the faulty line to lose power after the double-circuit line N-1 fails, affecting the power supply reliability and continuity of the power system.

[0060] In order to solve the serious overload problem of the operating line after the N-1 fault standby automatic transfer operation, it is necessary to shorten the time of overload operation of the power system, and ensure that as many loads as possible can operate safely, continuously and stably, improve the power supply reliability and continuity of the power system, and at the same time reduce the manual labor of dispatchers and on-site operation and maintenance personnel. Therefore, a standby automatic transfer operation method based on precise load control can be adopted to accurately control the load of the overhead double-inlet 110kV load station.

[0061] Figure 3 is a schematic diagram of an optional automatic load control method for a double-circuit overhead line according to an embodiment of the present application. Figure 2 The double-circuit overhead line 110kV (kilovolt) substation shown in the figure adopts the following Figure 3 The load control is performed by the automatic standby operation method based on precise load control. Figure 4 is a structural diagram of an optional automatic load control method for a double-circuit overhead line provided in an embodiment of the present application, such as Figure 4 As shown, it includes a standby automatic switching action module, a data detection module, a line load rate calculation and determination module and a precise load control module. Among them, the standby automatic switching action module is used to start the standby automatic switching action for the double-circuit overhead line 110kV (kilovolt) substation; the data detection module is used to detect the power data of the double-circuit overhead line 110kV (kilovolt) substation, such as current data and voltage data; the line load rate calculation and determination module is used to calculate the load rate of the operating line, and judge whether the operating line is overloaded according to the load rate; the precise load control module is used to control the load of the overloaded operating line to ensure that the load rate meets the requirements. For example Figure 3 The steps shown are described below.

[0062] Step S1, the data detection module detects the voltage values ​​of 110kV and 10kV buses and the current values ​​of each incoming line of the 110kV bus in real time in the 110kV substation, and transmits the detected data to the standby automatic switching action module and the line load rate calculation and judgment module respectively;

[0063] Step S2, after the incoming power supply connected to the 4# bus of the 110kV substation fails, the standby automatic switching action module detects that the 110kV4# bus voltage U1, and the 10kV3A# bus voltage U3A and 10kV3B# bus voltage U3B (if the 10kV side is a single bus, it is the 10kV3# bus voltage U3) carried by the 110kV4# bus through the transformer lose pressure to 0, and the standby automatic switching action module automatically starts the operation, trips the 4# bus incoming line switch 112 connected to the faulty power supply, and closes the 4# bus and 5# bus bus tie 145 switch;

[0064] Step S3: The line load rate calculation and determination module calculates the load rate of the double-circuit line N-1 connected to the 5# bus operating line after the fault backup is switched on: 5# bus incoming line current I2 / line rated current I;

[0065] After the running line supplies power to the faulty line, the current information of the running line and the rated current of the running line are detected. Based on the above current information and the rated current, the load rate of the running line after supplying power to the faulty line is obtained to determine whether there is a load overload problem in the running line. By collecting current in real time and combining it with the rated current of the running line, the load rate of the running line after power supply can be calculated more accurately, providing a reliable basis for subsequent load adjustment.

[0066] Step S4: The line load rate calculation and determination module determines whether the load rate of the double-circuit line N-1 connected to the 5# bus operating line after the fault standby automatic switching is greater than or equal to 120% (i.e., the load threshold). If the load rate is greater than or equal to 120%, the load rate calculation result is transmitted to the precise load control module to enter step S5. If it is not greater than 120%, it returns to step S3.

[0067] Step S5: The precise load control module automatically cuts off the 10kV whole line load 211 switches in sequence according to the load rate calculation results transmitted from the line load rate calculation and judgment module (i.e., the load control order) according to the line pulling sequence (i.e., the line pulling sequence is 211, 220, 212, 221, 213, 222, etc.), and returns to step S3 to loop until the load rate of the operating line is reduced to below 120%.

[0068] For the 10kV whole-line load, the sub-strategy of the load shedding strategy is used for load control. In order to control multiple loads on the operating line, it is first necessary to determine the load control order of multiple loads. By determining the risk level, load type and load distribution corresponding to the multiple loads on the operating line, and according to the risk level, load type and load distribution corresponding to the multiple loads, the load control order of the multiple loads on the operating line during load control is determined. By determining the control order of multiple loads, accurate load control can be performed when a load overload occurs on the operating line, avoiding unnecessary load losses and excessive wear of power equipment, reducing the adverse effects caused by load overload, and improving the stability and operation efficiency of the power system.

[0069] In order to determine the load control sequence of multiple loads, it is first necessary to conduct a risk assessment of the loads on the operating lines, and divide the loads into different risk levels according to their impact on the safe and stable operation of the power system. Secondly, the loads on the operating lines are classified into types, such as interruptible loads, non-interruptible loads, industrial loads, and residential loads. Then, the distribution of loads in the power network is determined, and then the geographical priority during load adjustment is determined to avoid new local overloads during the load adjustment process. The load control sequence of multiple loads on the operating lines is determined by combining the risk levels, load types, and load distribution corresponding to multiple loads. Determining the risk level, type, and distribution of loads on the operating lines will help the power system to manage the loads in a refined manner, improve the stability and security of the power grid, optimize the allocation and utilization of power resources, and respond quickly in the event of a fault to ensure the power supply of key users and facilities.

[0070] When the load rate of the operating line is greater than or equal to the load threshold of the operating line, the load control strategy of the operating line needs to be used to adjust the load of the operating line until the load rate of the operating line is less than the load threshold. Through the above process, accurate and efficient load adjustment can be performed after the operating line is overloaded, ensuring the safe operation of the power system and improving the stability and power supply reliability of the power system.

[0071] Through the above optional embodiments, for the problem of serious overload of the operating line after the N-1 fault standby automatic switching action, the load rate of the operating line is accurately calculated through line load rate calculation and judgment, so that when the load rate of the operating line exceeds 120% after the N-1 fault, it is no longer necessary to notify the substation operation and maintenance personnel to go to the site to immediately open the standby automatic switching, but to let the standby automatic switching start and close the mother switch, and then automatically and quickly cut off the load in sequence according to the line pulling sequence through precise load control until the line load rate drops below 120%. Through the above optional embodiments, the workload of the operating personnel is reduced, and the accuracy and efficiency of load control and the reliability of power supply are improved.

[0072] The above optional implementation methods achieve at least the following effects: by accurately calculating the load rate of the operating line, it is possible to quickly determine whether there is a load overload, and then timely perform load control on the operating line to avoid line failure problems caused by load overload; by determining the load control sequence of the load on the operating line, as well as the load control strategy, it is possible to quickly respond to and handle the load overload phenomenon of the operating line, thereby reducing the operating time of the operating line being overloaded, and quickly reducing the load rate of the operating line to below the load threshold, thereby preventing the operating line from overheating and damaging the safe and stable operation of the power system; by performing load control on each load on the operating line, the flexibility and accuracy of the load control are improved, and at the same time, the scope of power outages caused by load control can be reduced, thereby ensuring the safe and stable operation of important loads in the power system and improving the power supply reliability and continuity of the power system.

[0073] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0074] In this embodiment, a double-circuit overhead line backup automatic load control device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the terms "module" and "device" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0075] According to an embodiment of the present application, there is also provided an embodiment of a device for implementing a method for controlling a backup automatic load of a double-circuit overhead line. Figure 5 is a schematic diagram of a backup automatic load control device for a double-circuit overhead line according to an embodiment of the present application, such as Figure 5 As shown, the above-mentioned automatic load control device for the double-circuit overhead line includes an automatic load control module 502, a load rate determination module 504, a load control strategy determination module 506, and a load adjustment module 508. The device is described below.

[0076] The standby automatic switching module 502 is used to, when there is a fault line in the double-circuit overhead line, use the standby automatic switching process for the fault line, wherein the standby automatic switching is to use the operating line of the double-circuit overhead line except the fault line to supply power to the load included in the fault line;

[0077] The load rate determination module 504 is connected to the standby automatic switching module 502 and is used to determine the load rate after the operating line supplies power to the faulty line;

[0078] A load control strategy determination module 506, connected to the load rate determination module 504, for determining a load control strategy for the operating line based on the load rate;

[0079] The load adjustment module 508 is connected to the load control strategy determination module 506 and is used to adopt the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold.

[0080] In a double-circuit overhead line backup automatic load control device provided in an embodiment of the present application, a backup automatic switch module 502 is provided, which is used to adopt backup automatic switch processing for the faulty line when there is a faulty line in the double-circuit overhead line, wherein the backup automatic switch is to adopt the operating line of the double-circuit overhead line except the faulty line to power the load included in the faulty line; a load rate determination module 504 is connected to the backup automatic switch module 502, and is used to determine the load rate after the operating line supplies power to the faulty line; a load control strategy determination module 506 is connected to the load rate determination module 504, and is used to determine the load control strategy of the operating line based on the load rate; a load adjustment module 508 is connected to the load control strategy determination module 506, and is used to adopt the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold. The purpose of adjusting the load of the operating line based on the load control sequence and utilizing the load control strategy to avoid load overload of the operating line is achieved, and the technical effect of improving the accuracy and efficiency of load control of the operating line after the double-circuit overhead line is started and automatically switched, is achieved, thereby solving the technical problem in the related art that the load control effect of the operating line of the double-circuit overhead line after the standby automatic switching process is not ideal.

[0081] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0082] It should be noted that the above-mentioned automatic standby module 502, load rate determination module 504, load control strategy determination module 506, and load adjustment module 508 correspond to steps S102 to S108 in the embodiment, and the examples and application scenarios implemented by the above-mentioned modules and corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment. It should be noted that the above-mentioned modules can be run in a computer terminal as part of the device.

[0083] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0084] The above-mentioned automatic load control device for the double-circuit overhead line can also include a processor and a memory. The automatic load control module 502, the load rate determination module 504, the load control strategy determination module 506, the load adjustment module 508, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize the corresponding functions.

[0085] The processor includes a kernel, which retrieves the corresponding program unit from the memory. There can be one or more kernels. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one storage chip.

[0086] The embodiment of the present application provides a non-volatile storage medium on which a program is stored. When the program is executed by a processor, a method for controlling a backup automatic load of a double-circuit overhead line is implemented.

[0087] The embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program stored in the memory and can be run on the processor. When the processor executes the program, the following steps are implemented: when there is a fault line in a double-circuit overhead line, the fault line is processed by a standby automatic switch, wherein the standby automatic switch is to use the operating line in the double-circuit overhead line except the fault line to power the load included in the fault line; determine the load rate after the operating line powers the fault line; based on the load rate, determine the load control strategy of the operating line; use the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold. The device in this article can be a server, a PC, etc.

[0088] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: in the event that a fault line exists in a double-circuit overhead line, the fault line is subjected to standby automatic switching, wherein the standby automatic switching is to use the operating line of the double-circuit overhead line except for the fault line to supply power to the load included in the fault line; determine the load rate after the operating line supplies power to the fault line; determine the load control strategy of the operating line based on the load rate; and use the load control strategy to adjust the load of the operating line until the adjusted load rate is less than a load threshold.

[0089] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0090] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0091] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0093] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0094] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0095] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0096] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0097] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0098] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for controlling the backup automatic load of a double-circuit overhead line, characterized in that: include: In the case where there is a fault line in the double-circuit overhead line, the fault line is processed by standby automatic switching, wherein the standby automatic switching is to use the operating line of the double-circuit overhead line except the fault line to supply power to the load included in the fault line; Determine the load rate after the operating line supplies power to the faulty line; Based on the load rate, determining a load control strategy for the operating line; The load control strategy is adopted to adjust the load of the operating line until the adjusted load rate is less than the load threshold.

2. The method according to claim 1, characterized in that The determining the load rate after the operating line supplies power to the faulty line includes: Determine current information after the operating line supplies power to the faulty line, and the rated current of the operating line; Based on the current information and the rated current, a load rate after the operating line supplies power to the faulty line is determined.

3. The method according to claim 1, characterized in that The step of determining the load control strategy of the operating line includes: Determining a load control sequence of a plurality of loads on the operating line; Determining sub-strategies corresponding to the multiple loads respectively according to the regulation capabilities and response speeds respectively corresponding to the multiple loads; The load control sequence is adopted to integrate the sub-strategies corresponding to the multiple loads respectively to determine the load control strategy.

4. The method according to claim 3, characterized in that The sub-strategies corresponding to the multiple loads include a load shedding strategy and a power limiting strategy. The load shedding strategy is to disconnect the corresponding load from the operating line, and the power limiting strategy is to limit the maximum power of the corresponding load.

5. The method according to claim 3, characterized in that: The step of determining a load control sequence of a plurality of loads on the operating line comprises: Determine the risk level, load type and load distribution corresponding to the loads of the operating line respectively; The load control sequence of the multiple loads on the operating line is determined based on the risk levels, the load types, and the load distribution respectively corresponding to the loads on the operating line.

6. The method according to claim 1, characterized in that The step of determining the load control strategy of the operating line includes: Determining a predicted load rate of the operating line based on predicted weather information and historical electricity consumption data of the area where the operating line is located; Determining a predetermined reserve capacity of the operating line based on the predicted load rate; The load control strategy of the operating line is determined according to the predetermined spare capacity.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: Determine the carrying capacity and thermal stability coefficient of the operating line, and temperature data of the area where the operating line is located, wherein the thermal stability coefficient represents the ability of the operating line to remain stable under overload conditions; The load threshold of the operating line is determined based on the carrying capacity, the thermal stability coefficient, and the temperature data.

8. A double-circuit overhead line automatic load control device, characterized in that: include: A standby automatic switching module is used to, when there is a fault line in the double-circuit overhead line, use standby automatic switching to process the fault line, wherein the standby automatic switching is to use the operating line of the double-circuit overhead line except the fault line to power the load included in the fault line; A load rate determination module, used to determine the load rate after the operating line supplies power to the faulty line; A load control strategy determination module, used to determine the load control strategy of the operating line based on the load rate; The load adjustment module is used to adopt the load control strategy to adjust the load of the operating line until the adjusted load rate is less than the load threshold.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executed by the backup automatic load control method for a double-circuit overhead line as described in any one of claims 1 to 7.

10. An electronic device, characterized in that: include: One or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the backup automatic load control method for a double-circuit overhead line as described in any one of claims 1 to 7.

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