Sensor-based industrial park load identification and reconstruction method, system, equipment and medium

Abstract

The invention belongs to the technical field of load identification and reconstruction, and discloses an industrial park load identification and reconstruction method, system and device based on a sensor and a medium. The method comprises the steps that a sensor is installed on a direct-current bus of an industrial park electrical device; obtaining a preset space vector modulation strategy, and sampling the direct current side voltage during the current vector action period based on the preset space vector modulation strategy to obtain a corresponding line voltage; and calculating a three-phase line voltage signal in a switching period based on the current vector and the corresponding line voltage, thereby realizing identification and reconstruction of load side parameters. According to the invention, a sensor is configured on a direct current bus, and the action time of each sampled current vector exceeds the minimum sampling time by optimizing a space vector modulation strategy, so that the overall size of the system is reduced, and the installation, maintenance and space utilization of the system are more convenient and efficient; and meanwhile, a measurement dead zone is reduced, and the range of voltage reconstruction on the load side of the system is further expanded.

Description

Technical Field

[0001] The present invention belongs to the technical field of load identification and reconstruction, and specifically relates to a sensor-based industrial park load identification and reconstruction method, system, equipment and medium. Background Art

[0002] As a concentration of industrial users, the "source-grid-load-storage integrated" industrial park has a significant impact on the stable operation of the regional power grid and the surrounding environment. Distributed new energy facilities such as photovoltaics and wind power are generally deployed in this type of park to provide users with green and clean energy supply, supplemented by a certain number of energy storage devices. The load types in the park show diverse electricity consumption characteristics due to the different industry attributes of the users. Overall, the industrial park presents a typical "double high" characteristic, which causes the power quality of the park to show strong time-varying, nonlinear and wide frequency range characteristics.

[0003] As a key component for connecting loads, the traditional control method of electrical devices in industrial parks relies on multiple sensors to measure load-side information. However, this multi-sensor system not only increases the cost, but also inevitably has sampling errors between sensors due to differences in manufacturing processes, which poses a potential threat to the stable operation of the system. Therefore, it is particularly important to reconstruct the system load identification parameters using a small number of sensors. In order to effectively reduce the cost and volume of the system and reduce the impact of sampling errors between sensors, the existing technology has begun to explore methods for parameter reconstruction using a single sensor. However, this type of method introduces the problem of measurement dead zones in the low-profile system area and fan-shaped boundary area of ​​the space vector hexagon. Limited by the minimum sampling time, the implementation of parameter identification and reconstruction becomes particularly difficult.

[0004] In summary, existing technologies still face multiple challenges in realizing load identification and reconstruction in industrial parks. Specifically, the high cost of multi-sensor systems and the accuracy problems caused by sampling errors between sensors cannot be ignored; at the same time, the measurement dead zone introduced by the single-sensor reconstruction method in specific areas (such as the low-profile system area of ​​the space vector hexagon and the fan-shaped boundary area) limits its reliability; in addition, due to the limitation of the minimum sampling time, the real-time and economic performance of parameter identification and reconstruction also face certain challenges. Summary of the invention

[0005] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to solve at least one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a sensor-based industrial park load identification and reconstruction method, system, equipment and medium that meet one or more of the aforementioned needs, so as to achieve the purpose of saving costs, reducing measurement dead zones and increasing the voltage reconstruction range on the load side of the system.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a sensor-based industrial park load identification and reconstruction method, comprising the following steps: S1, installing the sensor on the DC bus of the industrial park electrical device; S2, obtaining a preset space vector modulation strategy, and based on this, sampling the DC side voltage during the action of the current vector to obtain the corresponding line voltage; S3, calculating the three-phase line voltage signal within a switching cycle based on the current vector and its corresponding line voltage, thereby realizing the identification and reconstruction of the load side parameters.

[0008] As a preferred solution, step S1 specifically includes: directly connecting one sampling pin of the sensor to a connection point of an upper bridge arm group of an industrial park electrical device, and directly connecting another sampling pin of the sensor to a connection point of a lower bridge arm group of the industrial park electrical device.

[0009] As a preferred solution, the preset space vector modulation strategy is: according to the distance between the area within the sector and the sector boundary, the sector is divided into a normal area and two boundary areas; the action time of the current vector in one switching cycle of the boundary area is adjusted so that the action time of each sampled current vector is greater than the minimum sampling time to eliminate the detection blind area; the sectors include sectors I, II, III, IV, V and VI; the current vector includes I 1 ,I 2 ,I 3 ,I 4 ,I 4 ,I 5 ,I 6 ,I 7 ,I 8 and I 9 .

[0010] As a preferred solution, the minimum sampling time includes the establishment time of the current following the voltage, the sampling and holding time of the A / D conversion, the delay time of the switching device, and the overlapping current time to prevent the open circuit.

[0011] As a preferred solution, the adjustment of the action time of the current vector in one switching cycle of the boundary area is specifically as follows: the working order of the current vector in one switching cycle, the normal area in sector I is I 1 -I 7 -I 2 -I 7 -I 1 , near I 1 The boundary area is I 1 -I 5 -I 2 -I 5-I 1 , near I 2 The boundary area is I 1 -I 4 -I 2 -I 4 -I 1 ; The working order of the current vector in a switching cycle, the normal area in sector II is I 2 -I 9 -I 3 -I 9 -I 2 , near I 2 The boundary area is I 2 -I 6 -I 3 -I 6 -I 2 , near I 3 The boundary area is I 2 -I 5 -I 3 -I 5 -I 2 ; The working order of the current vector in a switching cycle, the normal area in sector III is I 3 -I 8 -I 4 -I 8 -I 3 , near I 3 The boundary area is I 3 -I 1 -I 4 -I 1 -I 3 , near I 4 The boundary area is I 3 -I 6 -I 4 -I 6 -I 3 ; The working order of the current vector in a switching cycle, the normal area in sector IV is I 4 -I 7 -I 5 -I 7 -I 4 , near I 4 The boundary area is I 4 -I 2 -I 5 -I 2 -I 4 , near I 5 The boundary area is I 4 -I 1 -I 5 -I 1 -I 4; The working order of the current vector in a switching cycle, the normal area in sector V is I 5 -I 9 -I 6 -I 9 -I 5 , near I 5 The boundary area is I 5 -I 3 -I 6 -I 3 -I 5 , near I 6 The boundary area is I 5 -I 2 -I 6 -I 2 -I 5 ; The working order of the current vector in a switching cycle, the normal area in sector VI is I 6 -I 8 -I 1 -I 8 -I 6 , near I 6 The boundary area is I 6 -I 4 -I 1 -I 4 -I 6 , near I 1 The boundary area is I 6 -I 3 -I 1 -I 3 -I 6 .

[0012] As a preferred solution, the electrical device of the industrial park also includes a switch tube T 1 , T 2 , T 3 , T 4 , T 5 , T 6 , the corresponding relationship between the current vector and the switch state is as follows: 1 When working, the switch tube T 1 and T 6 work; when I 2 When working, the switch tube T 1 and T 2 work; when I 3 When working, the switch tube T 2 and T 3 work; when I 4 When working, the switch tube T 3 and T 4 work; when I 5 When working, the switch tube T4 and T 5 work; when I 6 When working, the switch tube T 5 and T 6 Work.

[0013] As a preferred solution, before step S3, the method further includes the following steps: setting the load to be star-connected; and setting the sum of the three-phase voltages to zero.

[0014] In a second aspect, the present invention provides a sensor-based industrial park load identification and reconstruction system for implementing the industrial park load identification and reconstruction method as described in the first aspect.

[0015] In a third aspect, the present invention provides an electronic device, wherein the computer device includes a memory, a processor, and a computer program, and when the computer program is executed by the processor, the industrial park load identification and reconstruction method as described in the first aspect is implemented.

[0016] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the industrial park load identification and reconstruction method as described in the first aspect is implemented.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention effectively reduces the overall size of the system by configuring a sensor on the DC bus and optimizing the space vector modulation strategy, thereby making the installation, maintenance and space utilization of the system more convenient and efficient. At the same time, reducing the number of sensors also reduces the complexity of the system accordingly, thereby improving the overall operating efficiency of the system.

[0019] 2. By adjusting the action time of the current vector in the sector boundary area within a switching cycle, it is ensured that the action time of each sampled current vector exceeds the minimum sampling time, while reducing the measurement dead zone and further improving the range of voltage reconstruction on the load side of the system.

[0020] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1It is a schematic diagram of an application scenario of the industrial park load identification and reconstruction method provided in an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the corresponding relationship between the current vector and the switch state in the industrial park electrical device sector I according to the embodiment of the present invention, wherein part (a) corresponds to I 1 When working, part (b) corresponds to I 2 When working, part (c) corresponds to I 7 While working.

[0024] Figure 3 It is a schematic diagram of sampling time according to an embodiment of the present invention.

[0025] Figure 4 It is a distribution diagram of the measurement dead zone in the two-phase stationary coordinate system according to the embodiment of the present invention.

[0026] Figure 5 2 is a vector synthesis diagram, wherein part (a) corresponds to the prior art, and parts (b) and (c) correspond to the space vector modulation strategy described in the embodiment of the present invention.

[0027] Figure 6 is a structural diagram of the electronic device provided in an embodiment of the present invention.

[0028] Figure Number:

[0029] 600. Electronic equipment;

[0030] 601, processor; 602, communication bus; 603, user interface; 604, network interface; 605, memory. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] In the following description, multiple embodiments of the present invention are provided, and different embodiments may be replaced or combined, so the present invention may also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the present invention should also be considered to include embodiments containing one or more of A, B, C, and D, all other possible combinations, even though the embodiment may not be clearly described in the following text.

[0033] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present invention. Various processes or components may be appropriately omitted, substituted or added to each example. For example, the described method may be performed in an order different from the described order, and various steps may be added, omitted or combined. In addition, the features described in some examples may be combined in other examples.

[0034] In order to facilitate a better understanding of the embodiments of the present invention, before explaining the specific implementation modes of the present invention in detail, its application scenarios are first described.

[0035] See also Figure 1 , Figure 1 A schematic diagram of the application scenario of the industrial park load identification and reconstruction method is shown. The industrial park load identification and reconstruction method described in the embodiments of this specification is applied to a variety of industrial production and energy management processes. In these scenarios, the application of the industrial park load identification and reconstruction method aims to accurately identify and reconstruct the load conditions in the industrial park, so that the system can more accurately grasp the energy consumption status of each device, and then realize the reasonable allocation and scheduling of energy, thereby improving energy utilization efficiency, optimizing equipment operation and maintenance, and enhancing system stability and security.

[0036] Embodiment 1:

[0037] The present embodiment provides a sensor-based industrial park load identification and reconstruction method, comprising the following steps: S1, installing the sensor on the DC bus of the industrial park electrical device; S2, obtaining a preset space vector modulation strategy, and based on this, sampling the DC side voltage during the action of the current vector to obtain the corresponding line voltage; S3, calculating the three-phase line voltage signal within a switching cycle based on the current vector and its corresponding line voltage, thereby realizing the identification and reconstruction of the load side parameters.

[0038] Specifically, this embodiment provides a preferred implementation, and step S1 specifically includes: directly connecting one sampling pin of the sensor to the connection point of the upper bridge arm group of the industrial park electrical device, and directly connecting another sampling pin of the sensor to the connection point of the lower bridge arm group of the industrial park electrical device.

[0039] Specifically, this embodiment provides a preferred implementation method, which includes the following steps before step S3: setting the load to be star-connected; and setting the sum of the three-phase voltages to zero.

[0040] Specifically, this embodiment provides a preferred implementation, wherein the preset space vector modulation strategy is: according to the distance between the area within the sector and the sector boundary, the sector is divided into a normal area and two boundary areas; the action time of the current vector in one switching cycle of the boundary area is adjusted so that the action time of each sampled current vector is greater than the minimum sampling time to eliminate the detection blind area; the sectors include sectors I, II, III, IV, V and VI; the current vector includes I 1 ,I 2 ,I 3 ,I 4 ,I 4 ,I 5 ,I 6 ,I 7 ,I 8 and I 9 .

[0041] Specifically, this embodiment provides a preferred implementation method, wherein the minimum sampling time includes the establishment time of current following voltage, the sampling and holding time of A / D conversion, the delay time of the switching device, and the overlapping current time to prevent open circuit.

[0042] Specifically, this embodiment provides a preferred implementation method, wherein the action time of the current vector in one switching cycle of the boundary area is adjusted, specifically: the working order of the current vector in one switching cycle, the normal area in sector I is I 1 -I 7 -I 2 -I 7 -I 1 , near I 1 The boundary area is I 2 and I 5 Separate action t 0 / 2 time replaces zero vector I 7 Function 0 time, so that the working order of the current vector is I 1 -I 5 -I 2 -I 5 -I 1 , near I 2 The boundary area is I 1 and I 4 Separate action t 0 / 2 time replaces zero vector I 7 Function 0 time, so that the working order of the current vector is I 1 -I 4 -I 2 -I 4 -I 1; The working order of the current vector in a switching cycle, the normal area in sector II is I 2 -I 9 -I 3 -I 9 -I 2 , near I 2 The boundary area is I 3 and I 6 Separate action t 0 / 2 time replaces zero vector I 9 Function 0 time, so that the working order of the current vector is I 2 -I 6 -I 3 -I 6 -I 2 , near I 3 The boundary area is I 2 and I 5 Separate action t 0 / 2 time replaces zero vector I 9 Function 0 time, so that the working order of the current vector is I 2 -I 5 -I 3 -I 5 -I 2 ; The working order of the current vector in a switching cycle, the normal area in sector III is I 3 -I 8 -I 4 -I 8 -I 3 , near I 3 The boundary area is I 4 and I 1 Separate action t 0 / 2 time replaces zero vector I 8 Function 0 time, so that the working order of the current vector is I 3 -I 1 -I 4 -I 1 -I 3 , near I 4 The boundary area is I 3 and I 6 Separate action t 0 / 2 time replaces zero vector I 8 Function 0 time, so that the working order of the current vector is I 3 -I 6 -I 4 -I 6 -I 3; The working order of the current vector in a switching cycle, the normal area in sector IV is I 4 -I 7 -I 5 -I 7 -I 4 , near I 4 The boundary area is I 5 and I 2 Separate action t 0 / 2 time replaces zero vector I 7 Function 0 time, so that the working order of the current vector is I 4 -I 2 -I 5 -I 2 -I 4 , near I 5 The boundary area is I 4 and I 1 Separate action t 0 / 2 time replaces zero vector I 7 Function 0 time, so that the working order of the current vector is I 4 -I 1 -I 5 -I 1 -I 4 ; The working order of the current vector in a switching cycle, the normal area in sector V is I 5 -I 9 -I 6 -I 9 -I 5 , near I 5 The boundary area is I 6 and I 3 Separate action t 0 / 2 time replaces zero vector I 9 Function 0 time, so that the working order of the current vector is I 5 -I 3 -I 6 -I 3 -I 5 , near I 6 The boundary area is I 5 and I 2 Separate action t 0 / 2 time replaces zero vector I 9 Function 0 time, so that the working order of the current vector is I 5 -I 2 -I 6 -I 2 -I 5; The working order of the current vector in a switching cycle, the normal area in sector VI is I 6 -I 8 -I 1 -I 8 -I 6 , near I 6 The boundary area is I 1 and I 4 Separate action t 0 / 2 time replaces zero vector I 8 Function 0 time, so that the working order of the current vector is I 6 -I 4 -I 1 -I 4 -I 6 , near I 1 The boundary area is I 6 and I 3 Separate action t 0 / 2 time replaces zero vector I 8 Function 0 time, so that the working order of the current vector is I 6 -I 3 -I 1 -I 3 -I 6 .

[0043] Specifically, this embodiment provides a preferred implementation mode, the industrial park electrical device also includes a switch tube T 1 , T 2 , T 3 , T 4 , T 5 , T 6 , the corresponding relationship between the current vector and the switch state is as follows: 1 When working, the switch tube T 1 and T 6 work; when I 2 When working, the switch tube T 1 and T 2 work; when I 3 When working, the switch tube T 2 and T 3 work; when I 4 When working, the switch tube T 3 and T 4 work; when I 5 When working, the switch tube T 4 and T 5 work; when I 6 When working, the switch tube T 5 and T 6 Work.

[0044] More specifically, the DC bus voltage corresponding to the current vector, taking sector I as an example, is Figure 2 In sector I, I 1 ,I 2 and I 7 Working together, when I 1 When working, Figure 2 As shown in (a), the switch tube T 1 and T 6 Working, the voltage signal obtained is; when I 2 When working, Figure 2 As shown in (b), the switch tube T 1 and T 2 Working, the voltage signal obtained is; when I 7 When working, Figure 2 As shown in (c), the switch tube T 1 and T 4 The voltage signal obtained is 0. Therefore, in each pulse width modulation cycle, two different line voltage information can be obtained. The corresponding relationship between the current vector and the line voltage can be summarized as shown in Table 1.

[0045] Table 1

[0046] <![CDATA[I i ]]> <![CDATA[T i &T j ]]> <![CDATA[V sam ]]> <![CDATA[I 1 ]]> <![CDATA[T 6 &T 1 ]]> <![CDATA[+u ab ]]> <![CDATA[I 2 ]]> <![CDATA[T 1 &T 2 ]]> <![CDATA[-u ca ]]> <![CDATA[I 3 ]]> <![CDATA[T 2 &T 3 ]]> <![CDATA[+u bc ]]> <![CDATA[I 4 ]]> <![CDATA[T 3 &T 4 ]]> <![CDATA[-u ab ]]> <![CDATA[I 5 ]]> <![CDATA[T 4 &T 5 ]]> <![CDATA[+u ca ]]> <![CDATA[I 6 ]]> <![CDATA[T 5 &T 6 ]]> <![CDATA[-u bc ]]> <![CDATA[I 7 ]]> <![CDATA[T 1 &T 4 ]]> 0 <![CDATA[I 8 ]]> <![CDATA[T 3 &T 6 ]]> 0 <![CDATA[I 9 ]]> <![CDATA[T 2 &T 5 ]]> 0

[0047] In Table 1, is the current vector, is the switching state corresponding to the current vector, and is the sampling results obtained under different current vectors.

[0048] In sector I, the sampling time is Figure 3 As shown, sampling is performed at the start and middle of a cycle. The voltage values ​​sampled in a cycle are expressed as V sam1 and V sam2 ,Right now:

[0049]

[0050] u ab +u bc +u ca =0, recorded as formula (2),

[0051] Since the industrial park load is star-connected, the line voltage u can be calculated by substituting it into formula (2): bc Thus, the three-phase line voltage signal can be obtained in one switching cycle. Therefore, the load flow side signal reconstruction can be completed by installing sensors on the DC side of the electrical device in the industrial park.

[0052] Analog conversion systems have a limited sampling time, so a minimum sampling duration T is always required. minTo ensure the accuracy and reliability of the sampling results. min As shown in formula (3), including T set (the time it takes for the current to follow the voltage), T ad (A / D analog to digital sampling and holding time), T delay (delay time of switching device turning on / off) and T over (Prevent open circuit overlap time).

[0053] T min =T set +T ad +T delay +T over , recorded as formula (3),

[0054] As mentioned above, due to the existence of the minimum sampling time, the action duration t of the current vector will appear in some areas of the space vector hexagon. i <T min , resulting in sampling failure, and then reconstruction failure, such as Figure 4 shown.

[0055] In the traditional algorithm, when I ref In I 2 In the boundary area, Figure 5 As shown in (a), in one pulse width modulation cycle, I ref by I 1 ,I 2 and zero vector I 7 To synthesize, as shown in formula (4).

[0056] I 1 t 1 +I 2 t 2 +I 7 t 0 =I ref T s , recorded as formula (4),

[0057] At this time I 1 The effect time is short and t 1 <T min The situation leads to 1 Sampling fails within the action time, and reconstruction fails.

[0058] According to the ampere-second balance principle, I 1 and I 4 is a pair of reference current vectors of equal magnitude and opposite direction. When they act together for the same time t i Time effect and zero vector action 2t i The effect is consistent, that is

[0059]

[0060] In order to eliminate the detection blind area, the action time t of each sampled vector is i Greater than T min , the traditional algorithm is improved. Taking sector I as an example, in sector I, the traditional current vector synthesis method is as follows Figure 5 As shown in (a), the improved current vector synthesis method is as follows Figure 5 (b) and 5(c).

[0061] like Figure 5 (b) shows, keep I 1 and I 2 The original action time remains unchanged, and I 7 The action time is equally divided into I 1 and I 4 , as shown in formula (6).

[0062]

[0063] Similarly, when I ref In I 1 In the boundary area, Figure 5 As shown in (c), in one pulse width modulation cycle, I ref by I 1 ,I 2 and I 5 To synthesize, keep I 1 and I 2 The original action time remains unchanged, and I 7 The action time is equally divided into I 2 and I 5 , as shown in formula (7).

[0064]

[0065] In summary, Figure 4 The traditional algorithm is used in the normal area of ​​the sector, while the improved algorithm is used in the sector boundary area. The improved algorithm changes the shortest action time of the vector in one cycle from t i Raised to t i +t 0 / 2, so that t i +t 0 / 2>T min , eliminating the detection blind area.

[0066] Embodiment 2:

[0067] This embodiment provides a sensor-based industrial park load identification and reconstruction system, which is used to implement the industrial park load identification and reconstruction method as described in the first aspect.

[0068] Embodiment three:

[0069] like Figure 6 As shown, this embodiment provides an electronic device, which may include: at least one processor, at least one network interface, a user interface, a memory, and at least one communication bus.

[0070] The communication bus can be used to realize the connection and communication among the above-mentioned components.

[0071] The user interface may include buttons, and the optional user interface may also include a standard wired interface or a wireless interface.

[0072] The network interface may include but is not limited to a Bluetooth module, an NFC module, a Wi-Fi module, etc.

[0073] Among them, the processor may include one or more processing cores. The processor uses various interfaces and lines to connect the various parts of the entire electronic device, and executes various functions of the electronic device and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory, and calling data stored in the memory. Optionally, the processor can be implemented in at least one hardware form of DSP, FPGA, and PLA. The processor can integrate one or a combination of CPU, GPU, modem, etc. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display; the modem is used to handle wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor, but may be implemented separately through a chip.

[0074] Among them, the memory may include RAM and ROM. Optionally, the memory includes a non-transitory computer-readable medium. The memory can be used to store instructions, programs, codes, code sets or instruction sets. The memory may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory may also be at least one storage device located away from the aforementioned processor. The memory as a computer storage medium may include an operating system, a network communication module, a user interface module, and an identification and reconstruction application. The processor can be used to call the identification and reconstruction application stored in the memory and execute the steps of industrial park load identification and reconstruction mentioned in the above-mentioned embodiments.

[0075] Embodiment 4:

[0076] This embodiment provides a computer-readable storage medium, which stores instructions, and when the instructions are executed on a computer or a processor, the computer or the processor executes one or more steps in the above embodiments. If the components of the above electronic device are implemented in the form of software functional units and sold or used as independent products, they can be stored in the computer-readable storage medium.

[0077] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of this specification is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0078] A person of ordinary skill in the art can understand that all or part of the processes in the method of the first embodiment can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes. In the absence of conflict, the technical features in this embodiment and the implementation scheme can be combined arbitrarily.

[0079] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The above is only an exemplary embodiment of the present invention and cannot be used to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the teachings of the present invention are still within the scope of the present invention. After considering the specification and practicing the disclosure here, it will be easy for those skilled in the art to think of the implementation scheme of the present invention. The present invention is intended to cover any modification, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not recorded in the present invention. The description and examples are only regarded as exemplary, and the scope and spirit of the present invention are defined by the claims.

Claims

1. A sensor-based industrial park load identification and reconstruction method, which is characterized by comprising the following steps: S1. Install the sensor on the DC bus of the electrical device in the industrial park; S2, obtaining a preset space vector modulation strategy, and based on this, sampling the DC side voltage during the current vector action period to obtain the corresponding line voltage; S3. Calculate the three-phase line voltage signal within a switching cycle based on the current vector and its corresponding line voltage, so as to realize the identification and reconstruction of load side parameters.

2. The sensor-based industrial park load identification and reconstruction method according to claim 1 is characterized in that: Step S1 is specifically as follows: One sampling pin of the sensor is directly connected to a connection point of an upper bridge arm group of an industrial park electrical device, and another sampling pin of the sensor is directly connected to a connection point of a lower bridge arm group of the industrial park electrical device.

3. The sensor-based industrial park load identification and reconstruction method according to claim 2 is characterized in that: The preset space vector modulation strategy is: According to the distance between the area within the sector and the sector boundary, the sector is divided into a normal area and two boundary areas; the action time of the current vector in one switching cycle of the boundary area is adjusted so that the action time of each sampled current vector is greater than the minimum sampling time to eliminate the detection blind area; The sectors include sector I, sector II, sector III, sector IV, sector V and sector VI; The current vectors include I1, I2, I3, I4, I4, I5, I6, I7, I8 and I9.

4. The sensor-based industrial park load identification and reconstruction method according to claim 3 is characterized by: The minimum sampling time includes the establishment time of the current following the voltage, the sampling and holding time of the A / D conversion, the delay time of the switching device, and the overlapping current time to prevent the open circuit.

5. The sensor-based industrial park load identification and reconstruction method according to claim 4 is characterized in that: The step of adjusting the action time of the current vector in one switching cycle of the boundary area is specifically: The working order of the current vector in one switching cycle is I1-I7-I2-I7-I1 in the normal area of ​​sector I, I1-I5-I2-I5-I1 in the boundary area close to I1, and I1-I4-I2-I4-I1 in the boundary area close to I2; The working order of the current vector in one switching cycle is I2-I9-I3-I9-I2 in the normal area of ​​sector II, I2-I6-I3-I6-I2 in the boundary area near I2, and I2-I5-I3-I5-I2 in the boundary area near I3; The working order of the current vector in one switching cycle is I3-I8-I4-I8-I3 in the normal area of ​​sector III, I3-I1-I4-I1-I3 in the boundary area near I3, and I3-I6-I4-I6-I3 in the boundary area near I4; The working order of the current vector in one switching cycle is I4-I7-I5-I7-I4 in the normal area of ​​sector IV, I4-I2-I5-I2-I4 in the boundary area near I4, and I4-I1-I5-I1-I4 in the boundary area near I5; The working order of the current vector in one switching cycle is I5-I9-I6-I9-I5 in the normal area of ​​sector V, I5-I3-I6-I3-I5 near the boundary area of ​​I5, and I5-I2-I6-I2-I5 near the boundary area of ​​I6; The working sequence of the current vector within a switching cycle is I6-I8-I1-I8-I6 in the normal area of ​​sector VI, I6-I4-I1-I4-I6 in the boundary area near I6, and I6-I3-I1-I3-I6 in the boundary area near I1.

6. The sensor-based industrial park load identification and reconstruction method according to claim 5 is characterized in that: The electrical device of the industrial park also includes switch tubes T1, T2, T3, T4, T5, and T6. The corresponding relationship between the current vector and the state of the switch tube is as follows: When I1 is working, the switch tubes T1 and T6 are working; When I2 is working, the switch tubes T1 and T2 are working; When I3 is working, switch tubes T2 and T3 are working; When I4 is working, switch tubes T3 and T4 are working; When I5 is working, switch tubes T4 and T5 are working; When I6 is working, switch tubes T5 and T6 are working.

7. The sensor-based industrial park load identification and reconstruction method according to claim 6 is characterized in that: Before step S3, the method further includes the following steps: Set the load to star connection; Set the sum of the three-phase voltages to zero.

8. A sensor-based industrial park load identification and reconstruction system, characterized in that: Used to implement the industrial park load identification and reconstruction method as described in any one of claims 1 to 7.

9. A computer device, comprising a memory, a processor and a computer program, characterized in that: When the computer program is executed by a processor, the industrial park load identification and reconstruction method as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the industrial park load identification and reconstruction method as described in any one of claims 1 to 7 is implemented.

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