Voltage sag treatment method and device for sensitive equipment, equipment and medium

Abstract

The invention provides a voltage sag treatment method for sensitive equipment, and belongs to the technical field of voltage sag treatment. The treatment method comprises the following steps: acquiring sensitive equipment information from an electric energy quality monitoring system; grouping the sensitive devices; defining the voltage sag treatment cost and the operation and maintenance cost of each sensitive device in each group; constructing a target function and constraint conditions of voltage sag treatment; solving the objective function, and obtaining treatment equipment adopted by each sensitive equipment in the group and compensation capacity provided by the treatment equipment; and determining a voltage sag treatment scheme of each group. According to the treatment method, the lowest cost is taken as the target, the treatment equipment type, the compensation capacity and the like are taken as constraints, on the basis, the genetic algorithm is adopted to solve the target function, the optimal solution is obtained, and the treatment equipment adopted for treating the sensitive equipment and the required compensation capacity are determined.

Description

Technical Field

[0001] The present invention belongs to the technical field of voltage sag management, and specifically relates to a voltage sag management method, a management device, an electronic device and a storage medium for sensitive equipment. Background Art

[0002] Voltage sag refers to the phenomenon that the effective value of the power supply voltage suddenly drops in a short period of time and then rises back to normal. The Institute of Electrical and Electronics Engineers (IEEE) defines voltage sag as the effective value of the power supply voltage dropping rapidly to 90% to 10% of the rated value, and then rising back to near the normal value, with a duration of 10ms to 1min. Voltage sag often causes manufacturing equipment to shut down or even burn out. Especially with the application of large-scale power electronic devices in industrial production processes, the problem of voltage sag is becoming more and more prominent. Voltage sag is extremely harmful to sensitive equipment, such as programmable logic controllers (PLCs), adjustable speed drives (ASDs), computer systems and other sensitive equipment. When they are subjected to voltage sags, sensitive equipment may be shut down, which brings great harm to industrial manufacturing and huge losses to enterprises.

[0003] The current voltage sag control technology is still immature. Most voltage sag control methods are still at the stage of unified control of the overall load of power quality sensitive users, rather than controlling sensitive equipment individually. However, voltage sag control for non-sensitive equipment will cause additional economic waste. To solve this problem, a "targeted" voltage sag control solution that only targets sensitive equipment is needed, which is of practical significance for reducing the economic losses of both users and power grids. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a voltage sag management method, a management device, an electronic device and a storage medium for sensitive equipment in view of the deficiencies in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A voltage sag control method for sensitive equipment, comprising: Obtain sensitive equipment information from power quality monitoring systems; Group sensitive devices; Define the voltage sag control cost and operation and maintenance cost of each sensitive device in each group; Construct the objective function and constraints for voltage sag management; Solve the objective function to obtain the governance device used by each sensitive device in the group and the compensation capacity provided by the governance device; Determine the voltage sag management plan for each group.

[0006] Furthermore, the sensitive equipment information obtained from the power quality monitoring system includes a list of sensitive equipment and compensation capacity required for sensitive equipment management.

[0007] Furthermore, the sensitive devices are grouped according to their installation locations or power supply network structures.

[0008] Furthermore, the cost of voltage sag control for sensitive equipment , where i is the i-th sensitive device in a single group, is the compensation capacity required for the i-th sensitive device, is the unit capacity cost of the treatment equipment used.

[0009] Furthermore, the voltage drop of sensitive equipment will increase the operation and maintenance costs. , where i is the i-th sensitive device in a single group, s is the s-th year of use of the governance device, and y is the total service life of the governance device. is the annual maintenance cost of the control measures used for the i-th sensitive equipment, and r is the discount rate.

[0010] Furthermore, the constructed objective function is , where N is the number of sensitive devices in the group.

[0011] Furthermore, the constraints of the constructed objective function are: , , , , ,in represents the jth type of treatment equipment used by the i-th sensitive equipment, , n is the type of treatment equipment, represents the compensation capacity required for the i-th sensitive device, It represents the compensation capacity provided by the j-th governance equipment for the ith sensitive equipment, and 1.1 is the margin left to meet the governance needs.

[0012] A voltage sag control device for sensitive equipment, comprising: An acquisition unit, used for acquiring sensitive equipment information from a power quality monitoring system, and for grouping sensitive equipment; A construction unit, used to construct a voltage sag control cost function for each sensitive device group, a voltage sag operation and maintenance cost function, an objective function and constraint conditions; The output unit is used to solve the objective function, to obtain the control equipment used by each sensitive device in different groups and the compensation capacity provided by the control equipment for the sensitive device, and to output the voltage sag control plan for each group.

[0013] An electronic device includes a processor and a memory; the memory is used to store executable instructions, and the processor is used to execute the instructions to implement the management method.

[0014] A computer-readable storage medium stores instructions, and when the instructions are executed, the governance method is implemented.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This application can automatically obtain sensitive equipment information from the power quality monitoring system installed in the factory, and group sensitive equipment according to the principle of convenient centralized management. The sensitive equipment in each group can be connected to the voltage sag management equipment nearby or conveniently; then this application determines the management equipment used according to the compensation capacity required for each sensitive device during management, and finally formulates an exclusive management plan for each group. The management method of this application aims at the lowest cost, with the type of management equipment and compensation capacity as constraints. On this basis, a genetic algorithm is used to solve the objective function, obtain the optimal solution, and determine the management equipment used for each sensitive device and the required compensation capacity.

[0016] Compared with the traditional voltage sag control method of uniformly controlling the overall load, the voltage sag control solution based on the targeted concept adopted in this application can bring higher economic benefits to users. Therefore, the voltage sag control solution based on the targeted concept is more promising than the traditional solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 : Flow chart of embodiment 1 of the present invention; Figure 2 : A schematic diagram of Embodiment 2 of the present invention; Figure 3 : Schematic diagram of embodiment 3 of the present invention. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0020] Example 1: See Figure 1The purpose of this embodiment is to provide a voltage sag control method for sensitive equipment. The control scheme determined by the control method utilizes dynamic voltage restorer (DVR), uninterruptible power supply (UPS) and other control devices to control voltage sag. These control devices can provide capacity compensation for sensitive equipment within milliseconds to meet the normal working needs of sensitive equipment during voltage sag.

[0021] The governance method includes: Step S101, obtaining sensitive equipment information from a power quality monitoring system.

[0022] At present, the equipment that needs to be treated for voltage sag has high requirements for power quality, and power quality monitoring systems are installed in most of the corresponding places. The power quality monitoring system can monitor the power quality data of each power-consuming equipment, and use the power quality data to analyze voltage sag events. After a voltage sag event occurs, if the power consumption data of the power-consuming equipment is interrupted for a short or long time, or the power consumption data drops far exceeding the voltage sag ratio, it means that the power-consuming equipment is affected by the voltage sag, and abnormal conditions such as restart or shutdown have occurred. These devices affected by the voltage sag can be determined as sensitive equipment. At the same time, the capacity that needs to be compensated for voltage sag treatment is calculated based on the power consumption data of sensitive equipment under normal circumstances.

[0023] Therefore, this step automatically obtains the list of sensitive devices from the power quality monitoring system and simultaneously obtains the compensation capacity required for the management of sensitive devices.

[0024] Step S102: grouping sensitive devices according to the principle of convenient management.

[0025] According to the installation location of the sensitive equipment obtained in step S101, or according to the power supply network structure in the area, the sensitive equipment are grouped so that the sensitive equipment in the same group can be conveniently connected to the same voltage sag control device, so as to facilitate centralized control of the sensitive equipment in the group and determine a set of targeted control plans for each group of sensitive equipment.

[0026] Step S103, defining the voltage sag management cost of each sensitive device in each group.

[0027] Determine the cost of voltage sag control for sensitive equipment based on the compensation capacity required for voltage sag control and the unit capacity cost of the control equipment. for . Where i is the i-th sensitive device in a single group, is the compensation capacity required for the i-th sensitive device, is the unit capacity cost of the treatment equipment used.

[0028] Step S104, defining the voltage sag operation and maintenance cost of each sensitive device in each group.

[0029] Determine the voltage sag operation and maintenance costs of sensitive equipment , where i is the i-th sensitive device in a single group, s is the s-th year of use of the governance device, and y is the total service life of the governance device. is the annual maintenance cost of the control measures used for the i-th sensitive equipment, and r is the discount rate.

[0030] Step S105, constructing the objective function and constraint conditions for voltage sag control.

[0031] Taking the lowest cost of voltage sag control solution within a single group as the goal, the objective function is constructed: Where N is the number of sensitive devices in the group.

[0032] Considering the type of treatment equipment for each sensitive device and the compensation capacity that the treatment equipment can provide as constraints of the objective function, and considering a certain margin, the constraints are: in represents the jth type of treatment equipment used by the i-th sensitive equipment, , n is the type of treatment equipment, represents the compensation capacity required for the i-th sensitive device, It represents the compensation capacity provided by the j-th governance equipment for the ith sensitive equipment, and 1.1 is the margin left to meet the governance needs. The value of is 0 or 1. When the value is 1, it means that the i-th sensitive device has selected the j-th governance device, and the above constraints limit each sensitive device to only one governance device.

[0033] Step S106, using a genetic algorithm to solve the objective function, to obtain the management device used by each sensitive device in the group and the compensation capacity provided by the corresponding management device.

[0034] First, the population size, evolutionary generations, mutation probability and other parameters of the genetic algorithm are initialized, and the fitness function is defined according to the constraints in step S105. Then, an initial population is created, in which each individual represents a solution of the C value.

[0035] For each generation of the population, perform the following repeated steps until the specified number of evolutionary generations is reached: use the formula to calculate the fitness of each individual in the population, select excellent individuals as parents based on the fitness, use the selected parents to perform crossover operations to generate new offspring individuals, perform mutation operations on the new offspring individuals, introduce a certain amount of randomness, and merge the offspring individuals with the parent individuals to form the next generation of the population.

[0036] Selecting the individual with the best fitness from the final population is the solution to the objective function.

[0037] Therefore, through the solution process of the above genetic algorithm, it is possible to obtain the governance device used by each sensitive device in the group and the compensation capacity provided by the corresponding governance device for the sensitive device.

[0038] Step S107, determining a voltage sag control solution for each group.

[0039] In each group, classified statistics are conducted according to the different treatment devices used for sensitive devices, and the total compensation capacity required by different treatment devices is counted. This total capacity is the minimum rated capacity of the treatment equipment constructed in the group.

[0040] Therefore, by using step S106 and step S107, the management equipment required for each group, the minimum rated capacity of these management equipment, and the compensation capacity allocated by these management equipment to different sensitive devices can be obtained.

[0041] The following uses the voltage sag control of a certain automobile factory as an example to illustrate the application process of this application. First, the data recorded by the power quality monitoring system installed in the automobile factory is automatically analyzed to identify the voltage sag time, identify all sensitive devices affected by the voltage sag event, and calculate the compensation capacity required for the sensitive devices to be controlled.

[0042] Then all sensitive equipment is grouped. For this factory, the grouping can be based on the installation location of the sensitive equipment and the production workshop. For example, the factory divides the sensitive equipment into four corresponding groups according to the four workshops of stamping, welding, painting and assembly. Then a voltage sag control plan is formulated for each group.

[0043] Specifically, taking the group corresponding to the paint shop as an example, this group contains the following sensitive equipment: Serial number Sensitive equipment Capacity required for treatment (kVA) 1 Black paint robot 15 2 Color paint 1ST robot system 20 3 Color paint 2ST robot system 35 4 Drying Oven System A 180 5 Varnish 5ST Robotic System 20 6 Varnish 6ST Robotic System 20 7 Sealant 1ST Robotic System 16.5 8 Sealant 2ST Robotic System 16.5 9 Sealant 3ST Robotic System 8 10 Drying Oven System B 120 11 CP Robot 7 12 Sealant 4ST Robot System (spare) 7 First, we decided that the treatment plan would use two types of treatment equipment: DVR and UPS. and The unit capacity cost of DVR is 3,000 yuan / kVA, the unit capacity cost of UPS is 2,180 yuan / kVA, the annual operation and maintenance cost of a single sensitive device when it is managed by DVR is 327 yuan, and the annual operation and maintenance cost of a single sensitive device when it is managed by UPS is 150 yuan.

[0044] Then, the objective function can be solved by combining the above methods to obtain the following governance solution: Serial number Sensitive equipment Governance equipment Compensation capacity of treatment (kVA) 1 Black paint robot ups 16.5 2 Color paint 1ST robot system ups 22 3 Color paint 2ST robot system ups 38.5 4 Drying Oven System A ups 198 5 Varnish 5ST Robotic System ups 22 6 Varnish 6ST Robotic System ups 22 7 Sealant 1ST Robotic System ups 18.15 8 Sealant 2ST Robotic System ups 18.15 9 Sealant 3ST Robotic System DVR 8.8 10 Drying Oven System B ups 132 11 CP Robot DVR 7.7 12 Sealant 4ST Robot System (spare) DVR 7.7 In the above table, some sensitive equipment is managed by UPS, and some sensitive equipment is managed by DVR. The total compensation capacity provided by UPS is 487.3kVA, and the total compensation capacity provided by DVR is 24.4kVA. Therefore, a UPS with a rated capacity of more than 487.3kVA and a DVR with a rated capacity of more than 24.4kVA are installed in the paint shop, and the sensitive equipment in the above table is connected and configured.

[0045] Example 2: See Figure 2 The purpose of this embodiment is to provide a voltage sag control device for sensitive equipment, which is used to perform the control method of embodiment 1. The control device 200 includes: an acquisition unit 201, a construction unit 202 and an output unit 203.

[0046] The acquisition unit 201 is connected to the power quality monitoring system and is used to acquire the recorded data from the power quality monitoring system and obtain the list of sensitive devices and the compensation capacity required for the management of these sensitive devices. The acquisition unit 201 is also used to acquire the installation location of the sensitive devices or the power supply network organization for grouping the sensitive devices.

[0047] The construction unit 202 is used to construct a voltage sag management cost function, a voltage sag operation and maintenance cost function, an objective function and constraint conditions for each sensitive device group.

[0048] The output unit 203 is used to solve the objective function using a genetic algorithm and known conditions, to obtain the control equipment used by each sensitive device in different groups and the compensation capacity provided by the corresponding control equipment for the sensitive device, and to output the voltage sag control plan for each group.

[0049] Example 3: See Figure 3 The purpose of this embodiment is to provide an electronic device 300, including at least one processor 301 and one or more memories 302 for storing executable instructions of the processor 301. The processor 301 is used to execute the instructions in the memory 302 to implement the governance method described in Example 1.

[0050] The electronic device 300 further includes a bus 304 , and the processor 301 and the memory 302 are connected to each other via the bus 304 , or are connected to each other in other ways.

[0051] The processor 301 is a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 301 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation. In one example, the processor 301 may include one or more CPUs, such as Figure 3 CPU0 and CPU1 in.

[0052] The memory 302 may be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0053] It should be noted that the memory 302 may exist independently of the processor 301 or may be integrated with the processor 301. The memory 302 may be used to store instructions or program codes or some data, etc. The memory 302 may be located inside the electronic device 300 or outside the electronic device 300, without limitation.

[0054] As an optional implementation, the electronic device 300 also includes a communication interface 303. The communication interface 303 is a wired interface (or port), such as a fiber distributed data interface (FDDI), a gigabit Ethernet interface (GE), etc. Alternatively, the communication interface 303 is a wireless interface. The communication interface 303 can be a module, a circuit, a communication interface, or any device capable of achieving communication. The communication interface 303 is used to communicate with other devices or other communication networks, which can be Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0055] As an optional implementation, the electronic device 300 further includes an input device 305 and an output device 306. For example, the input device 305 is a keyboard, a mouse, a microphone, a joystick, and the like, and the output device 306 is a display screen, a speaker, and the like.

[0056] It should be noted that the electronic device 300 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a Figure 3 In addition, Figure 3 The components shown in the figure do not constitute a limitation on the terminal device, except Figure 3 In addition to the components shown, the electronic device 300 may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0057] Embodiment 4: The purpose of this embodiment is to provide a computer-readable storage medium.

[0058] All or part of the processes in the above method embodiments can be completed by computer instructions to instruct relevant hardware. The program can be stored in the computer-readable storage medium. When the program is executed, it can implement the governance method described in Example 1.

[0059] The computer-readable storage medium may be an internal storage unit of the electronic device of Example 3, such as a hard disk or a memory. The computer-readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the computer-readable storage medium may also include both an internal storage unit and an external storage device of the above-mentioned electronic device. The computer-readable storage medium is used to store computer programs and other programs and data required by the electronic device. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0060] In conjunction with the several embodiments provided in this application, it should be understood that the provided devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0061] In addition, in the embodiment of the device of the present application, each functional module or unit can be integrated into one unit, or each module or unit can exist physically separately, or two or more modules or units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional modules.

[0062] If the above-mentioned integrated unit is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for controlling voltage sag of sensitive equipment, characterized by: include: Obtain sensitive equipment information from power quality monitoring systems; Group sensitive devices; Define the voltage sag control cost and operation and maintenance cost of each sensitive device in each group; Construct the objective function and constraints for voltage sag management; Solve the objective function to obtain the governance device used by each sensitive device in the group and the compensation capacity provided by the governance device; Determine the voltage sag management plan for each group.

2. The voltage sag control method for sensitive equipment according to claim 1, characterized in that: The sensitive equipment information obtained from the power quality monitoring system includes the sensitive equipment list and the compensation capacity required for sensitive equipment management.

3. The voltage sag control method for sensitive equipment according to claim 2, characterized in that: Sensitive devices are grouped according to their installation location or power supply network structure.

4. The voltage sag control method for sensitive equipment according to claim 3, characterized in that: Cost of voltage sag control for sensitive equipment , where i is the i-th sensitive device in a single group, is the compensation capacity required for the i-th sensitive device, is the unit capacity cost of the treatment equipment used.

5. The voltage sag control method for sensitive equipment according to claim 4, characterized in that: Voltage drop in sensitive equipment Operation and maintenance costs , where i is the i-th sensitive device in a single group, s is the s-th year of use of the governance device, and y is the total service life of the governance device. is the annual maintenance cost of the control measures used for the i-th sensitive equipment, and r is the discount rate.

6. The voltage sag control method for sensitive equipment according to claim 5, characterized in that: The constructed objective function is , where N is the number of sensitive devices in the group.

7. The voltage sag control method for sensitive equipment according to claim 6, characterized in that: The constraints of the constructed objective function are: , , , , ,in represents the jth type of treatment equipment used by the i-th sensitive equipment, , n is the type of treatment equipment, represents the compensation capacity required for the i-th sensitive device, It represents the compensation capacity provided by the j-th governance equipment for the ith sensitive equipment, and 1.1 is the margin left to meet the governance needs.

8. A voltage sag control device for sensitive equipment, characterized by: include: An acquisition unit, used for acquiring sensitive equipment information from a power quality monitoring system, and for grouping sensitive equipment; A construction unit, used to construct a voltage sag control cost function for each sensitive device group, a voltage sag operation and maintenance cost function, an objective function and constraint conditions; The output unit is used to solve the objective function, to obtain the control equipment used by each sensitive device in different groups and the compensation capacity provided by the control equipment for the sensitive device, and to output the voltage sag control plan for each group.

9. An electronic device, characterized in that: It comprises a processor and a memory; the memory is used to store executable instructions, and the processor is used to execute the instructions to implement the governance method described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores instructions, and when the instructions are executed, the governance method described in any one of claims 1-7 is implemented.

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