Temporary electrical load management system and method for construction site

Abstract

The invention discloses a temporary electrical load management system and a temporary electrical load management method for a construction site, and relates to the technical field of electric power supply. Calculating transformer load parameters after the transformers are connected to the screened maintenance power boxes and the corresponding power distribution loops according to the topological graph of the power distribution system, and finally scoring the transformer load parameters according to a preset scoring standard to select the power distribution loop with the highest score as a final temporary power utilization load distribution scheme. And positioning and marking are carried out in the map sub-module. By establishing the topological graph of the power distribution system, acquiring load parameters of the power distribution transformer, the power distribution loops and the like in real time, and distributing the temporary power supply according to the load conditions of the different power distribution loops connected to the power distribution transformer, the load distribution of the power distribution transformer is more reasonable, and the problems of unbalanced three-phase load distribution and economic operation of the transformer are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power supply, and in particular to a temporary power load management system and method for a construction site. Background Art

[0002] Temporary power supply facilities are widely used in project construction and daily maintenance and repair processes of industrial enterprises. Generally, the power required for temporary power supply is provided by the maintenance power boxes within the factory. There are a large number of maintenance power boxes, which are distributed in various locations in the factory. At present, they are mainly managed manually, which has the following disadvantages: (1) There are a large number of maintenance power boxes and they are widely distributed. It is impossible to accurately understand the load situation and backup distribution circuit situation of each maintenance power box in real time. Therefore, it is impossible to quickly match the appropriate maintenance power box and its distribution circuit according to the temporary power load situation; (2) There is no topology diagram of the entire distribution system, and it is impossible to allocate temporary power according to the load situation of each distribution transformer, which will lead to unreasonable transformer load distribution or unbalanced three-phase load distribution of a certain transformer.

[0003] The background description provided herein is for the purpose of generally presenting the context of the present disclosure. Unless otherwise indicated herein, the materials described in this section are not prior art to the claims of this application and are not admitted to be prior art by inclusion in this section. Summary of the invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a temporary power load management system and method for a construction site.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] In the first aspect, the present invention provides a temporary power load management system for a construction site, including a distribution transformer, N maintenance power boxes, a sensor device module, a GPS module, an intelligent gateway module, a communication module, a system server and a management module:

[0007] Distribution transformer, including high voltage side and low voltage side; the voltage on the low voltage side is lower than that on the high voltage side;

[0008] The maintenance power supply box includes a power circuit breaker and M power distribution circuits; the power circuit breaker is used to control the disconnection and connection of the maintenance power supply box; the power distribution circuit includes a circuit breaker for controlling the disconnection and connection of the power distribution circuit;

[0009] A sensor device module is used to collect the circuit breaker opening and closing state signals and the three-phase current data of each distribution circuit in the maintenance power supply box; the sensor device module includes a circuit breaker opening and closing sensor and a current sensor; the circuit breaker includes a power circuit breaker and a circuit breaker of each distribution circuit;

[0010] GPS module, used to obtain the location information of the power box under maintenance and send it to the system server;

[0011] The intelligent gateway module is used to receive the circuit breaker opening and closing status signals and the three-phase current data of each distribution circuit sent by the communication module, collect the high-voltage side data and the low-voltage side data of the transformer, and transmit the received and collected data to the system server;

[0012] A communication module, used to transmit the circuit breaker opening and closing state signals and three-phase current data obtained by the sensor device module to the intelligent gateway module;

[0013] The management module includes a map submodule, a power distribution system topology submodule, a basic information submodule, and a load distribution submodule;

[0014] Map submodule: used to display the location of the maintenance power box and corresponding data on the map according to the data in the system server;

[0015] Power distribution system topology diagram submodule: used to create and display the power distribution system topology diagram; the power distribution system topology diagram includes transformer data, high-voltage circuit breaker data, low-voltage circuit breaker data and maintenance power supply box data; the transformer data includes high-voltage side data and low-voltage side data; the low-voltage circuit breaker data includes low-voltage circuit breaker operating current and low-voltage circuit breaker switch status; the maintenance power supply box data includes power supply box switch status, three-phase current data and each distribution circuit information; the distribution circuit information includes: circuit operating current, circuit switch rated current and circuit switch status; the circuit switch status includes disconnection and connection;

[0016] Basic information submodule: used to input, store and manage data information in the power distribution system topology submodule;

[0017] The load distribution submodule is used to screen out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters after the transformer is connected to the screened maintenance power supply box and the corresponding distribution circuit according to the distribution system topology diagram, and finally score the transformer load parameters according to the preset scoring criteria to select the distribution circuit with the highest score as the final temporary power load distribution plan, and locate and mark it in the map submodule; the temporary power load information includes the temporary power load location, temporary power load current, and temporary power load type; the temporary power load type is three-phase load or single-phase load; the transformer load parameters include the transformer operating current I', the three-phase current imbalance ΔI%' and the load rate β'; the preset scoring criteria include the load rate score, the distance score and the three-phase imbalance score.

[0018] Specifically, the load distribution submodule includes:

[0019] According to the temporary power load position, select the first pre-selected maintenance power supply box within the preset radius R;

[0020] According to the temporary power load current, select from the first pre-selected maintenance power supply box a distribution circuit whose switch rated current meets the temporary power load current requirement and whose circuit switch state is disconnected;

[0021] According to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameters on the low-voltage side of the distribution transformer after the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit are calculated;

[0022] If the temporary power load type is three-phase load, the distribution circuit is scored according to the preset scoring criteria by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, as well as the distance between the temporary power load location and the maintenance power box. A temporary power load distribution plan is generated based on the principle of giving priority to load rate scores and secondarily to distance scores.

[0023] Specifically, the temporary power load distribution plan is generated according to the principle of giving priority to the load rate score and secondly to the distance score:

[0024] Compare the load rate scores of the low-voltage side of the distribution transformers after connecting to each distribution circuit, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

[0025] Specifically, the load distribution submodule also includes:

[0026] If the temporary power load type is single-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, the distance between the temporary power load location and the maintenance power box, and the three-phase current imbalance on the low-voltage side of the distribution transformer when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring criteria, and a temporary power load distribution plan is generated based on the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and followed by the distance score.

[0027] Specifically, the temporary power load distribution plan is generated according to the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and secondarily to the distance score:

[0028] Compare the load rate score of the low-voltage side of the distribution transformer after connecting to each distribution circuit and the sum of the three-phase current imbalance scores, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate score and the sum of the three-phase current imbalance scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

[0029] Specifically, the preset scoring criteria include:

[0030] 1) Obtain the load rate score based on the comparison between the load rate before and after the temporary power load is connected and the economic operation load rate:

[0031] If the load rate after connecting to the distribution circuit is within the economic operation load rate range, the distribution circuit will get 5 points;

[0032] If the load rate is within the economic operation load rate range before connecting to the distribution circuit, but is not within the economic operation range after connecting to the temporary power load, the distribution circuit will get 0 points;

[0033] If the load rate before and after the connection to the distribution circuit is not within the economic operation load rate range, the difference between the two and the economic operation load rate range is compared. If the difference after the connection to the distribution circuit is less than the difference before the connection, the distribution circuit will get 3 points; if the difference after the connection to the distribution circuit is greater than or equal to the difference before the connection, the distribution circuit will get 1 point;

[0034] 2) Obtain a distance score by comparing the distance between the temporary power load location and the maintenance power box where the power distribution circuit is located;

[0035] If the distance between the temporary power load location and the maintenance power box is less than R / 4, the distance score is 5 points;

[0036] If the distance between the temporary power load location and the maintenance power box is greater than or equal to R / 4 and less than or equal to R / 2, the distance score is 3 points;

[0037] If the distance between the temporary power load location and the maintenance power box is greater than R / 2 and less than or equal to R, the distance score is 1 point;

[0038] 3) If the temporary power load is a single-phase load, the three-phase current imbalance score is calculated based on the three-phase current imbalance on the low-voltage side of the distribution transformer when the distribution circuit is connected to different phases;

[0039] Substitute the current values ​​after the distribution circuit is connected to phase A, phase B, and phase C into the formula: three-phase current imbalance ΔI%'=(I' 最大值 -I' 最小值 ) / I d', calculate the three-phase unbalance of the low-voltage side of the distribution transformer when connected to three different phases;

[0040] According to the values ​​of the three-phase current unbalance degree on the low-voltage side of the distribution transformer when connected to three different phases, they are ranked from small to large, and they are scored 5 points, 3 points, and 1 point respectively;

[0041] Among them, I 最大值 It is the maximum current in the three phases after the temporary power load is connected; I' 最小值 It is the minimum current in the three phases after the temporary power load is connected; I d ' is the average value of three-phase current after temporary power load is connected.

[0042] Specifically, the circuit breaker opening and closing sensor, the current sensor, the GPS module and the communication module are installed in a maintenance power supply box; the communication module is connected to the circuit breaker opening and closing sensor and the current sensor.

[0043] Specifically, the intelligent gateway module is installed in the substation and connected to the communication interfaces of the electrical circuit instruments on the high-voltage side and the low-voltage side of the distribution transformer through communication cables.

[0044] In a second aspect, the present invention provides a method for managing temporary power loads at a construction site, which is based on a temporary power load management system for a construction site as described in any one of the first aspects, and the method comprises:

[0045] S1, new temporary power load information;

[0046] S2. Filter out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters of the distribution transformers of each selected maintenance power supply box after connecting to the temporary power load according to the distribution system topology diagram, and score them according to the preset scoring criteria to generate the final temporary power load distribution plan; specifically including:

[0047] S21, selecting a first pre-selected maintenance power supply box within a preset radius R according to the temporary power load position;

[0048] S22, selecting, from the first pre-selected maintenance power supply box, a distribution circuit whose switch rated current meets the temporary power load current requirement and whose circuit switch state is disconnected according to the temporary power load current;

[0049] S23, according to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameter of the low-voltage side of the distribution transformer after the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit is calculated;

[0050] S24. If the temporary power load type is a three-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate and the distance between the temporary power load position and the maintenance power box, the distribution circuit is scored according to the preset scoring standard, and a temporary power load distribution plan is generated according to the principle of giving priority to the load rate score and secondarily to the distance score;

[0051] S25. The location of the maintenance power box where the power distribution circuit of the optimal solution is located is located, marked and displayed in the map submodule.

[0052] Specifically, step S24 also includes:

[0053] If the temporary power load type is single-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, the distance between the temporary power load location and the maintenance power box, and the three-phase current imbalance on the low-voltage side of the distribution transformer when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring criteria, and a temporary power load distribution plan is generated based on the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and followed by the distance score.

[0054] The present invention adopts a temporary power load management system for construction sites. By establishing a topological diagram of the distribution system, load parameters of distribution transformers, distribution circuits and the like in the distribution system can be acquired in real time. Temporary power supply can be distributed according to the load conditions of different distribution circuits connected to the distribution transformer, so that the load distribution of the distribution transformer is more reasonable, and the problems of unbalanced three-phase load distribution and economical operation of the distribution transformer are effectively solved.

[0055] In addition, the present invention clearly displays the location information of all maintenance power boxes through the map submodule, and when the optimal distribution circuit is screened out, the location of the corresponding maintenance power box can be quickly found. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 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 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.

[0057] Figure 1 This is a schematic diagram of a temporary power load management system for a construction site provided according to an embodiment of the present invention;

[0058] Figure 2 is a schematic diagram of a management module provided according to an embodiment of the present invention;

[0059] Figure 3It is a schematic diagram of a temporary power load management method for a construction site provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0061] Embodiment 1

[0062] refer to Figure 1 According to this embodiment, a temporary power load management system for a construction site is disclosed, including a distribution transformer, a maintenance power box, a high-voltage circuit breaker, a low-voltage circuit breaker, a sensor device module, a GPS module, an intelligent gateway module, a communication module, a system server and a management module:

[0063] Distribution transformer, including high voltage side and low voltage side; the voltage on the low voltage side is lower than that on the high voltage side;

[0064] The voltages on the high-voltage side and the low-voltage side are selected according to the type of the selected distribution transformer and the actual situation on site, and are not limited here; preferably, the distribution transformer in this embodiment is a 6 / 0.4kV distribution transformer, in which the high-voltage side of the distribution transformer is the 6kV side and the low-voltage side is the 0.4kV side; the distribution transformer is located in the transformer room;

[0065] The high-voltage switch cabinet located in the first substation provides the first high-voltage power supply to the high-voltage side of the distribution transformer through a cable output; the first substation is a 6kV substation; the high-voltage switch cabinet is a 6kV switch cabinet; the first high voltage is 6kV;

[0066] The low-voltage side of the distribution transformer provides a first low-voltage power supply to the second substation incoming line through a cable output, and the first low-voltage power supply is connected to a low-voltage incoming line cabinet; the second substation is a 0.4kV substation; the low-voltage incoming line cabinet is a 0.4kV incoming line cabinet; the first low voltage is 0.4kV;

[0067] The high-voltage switch cabinet includes an instrument device that provides a communication interface to obtain data on the high-voltage side of the distribution transformer, and the low-voltage incoming line cabinet includes an incoming line instrument device that provides a communication interface to obtain data on the low-voltage side of the transformer;

[0068] The high-voltage side data and the low-voltage side data both include: rated current, operating current, voltage, active power, power factor, and switch status; the distribution transformer data includes transformer rated capacity, high-voltage side data, and low-voltage side data.

[0069] The rated current and operating current in the high-voltage side data and low-voltage side data are three-phase currents;

[0070] The first substation also includes a high-voltage circuit breaker for controlling the input and disconnection of the first high-voltage power supply; the first high-voltage circuit breaker is a 6kV circuit breaker;

[0071] The second substation also includes a low-voltage circuit breaker for controlling the output and disconnection of the first low-voltage power supply; the first low-voltage circuit breaker is a 0.4kV circuit breaker.

[0072] There are N maintenance power boxes; the number N is determined according to on-site requirements.

[0073] The second substation includes N switches, and each switch corresponds to a maintenance power box one by one.

[0074] The maintenance power supply box includes a power circuit breaker and M power distribution circuits; the power circuit breaker is used to control the disconnection and connection of the maintenance power supply box; the power distribution circuit includes a circuit breaker for controlling the disconnection and connection of the power distribution circuit;

[0075] The maintenance power box is located at the construction site, and the value of M is determined according to the specific needs of the construction site.

[0076] The power distribution circuit contains power distribution circuit information, including: circuit operating current, circuit switch rated current and circuit switch status; the circuit switch status includes disconnection and connection.

[0077] A distribution circuit refers to the complete power transmission path from a power source (such as a distribution transformer) to electrical equipment (such as welding machines, power tools, etc.). A distribution circuit usually includes the following main parts:

[0078] Power supply side: usually refers to the power supply point output by the distribution transformer;

[0079] Circuit breaker: used to control the on and off of the circuit and provide overload or short circuit protection when necessary; it can be understood that when the circuit breaker is connected, the circuit switch state is connected, and the power distribution circuit is on; when the circuit breaker is disconnected, the circuit switch state is disconnected, and the power distribution circuit is disconnected;

[0080] Protection devices: such as fuses and leakage protectors, used to protect circuits and electrical equipment in the event of a fault;

[0081] Wire or cable: used to transmit electrical energy;

[0082] Electrical equipment: The final equipment served by the power distribution circuit, such as welding machines, power tools, etc.

[0083] The distribution circuit can distribute electrical energy to ensure that each electrical device in the circuit obtains a stable power supply, and when necessary, it can individually control or isolate a distribution circuit through a circuit switch without affecting the operation of other distribution circuits.

[0084] The sensor device module is used to collect the circuit breaker opening and closing status signals and the three-phase current data of each distribution circuit in the maintenance power box; the sensor device module includes a circuit breaker opening and closing sensor and a current sensor; the circuit breaker includes a power circuit breaker and a circuit breaker of each distribution circuit; each circuit breaker in the circuit breaker is correspondingly equipped with a circuit breaker opening and closing sensor and a current sensor.

[0085] The circuit breaker opening and closing sensor is used to collect the circuit breaker opening and closing state signal; the current sensor is used to collect the three-phase current data of each distribution circuit;

[0086] The three-phase current data of the power distribution circuit includes the A-phase current, the B-phase current and the C-phase current;

[0087] The circuit breaker opening and closing sensor and the current sensor are installed in the maintenance power box;

[0088] GPS module, used to obtain the longitude and latitude coordinates of the power box under maintenance and send them to the system server;

[0089] The GPS module is installed in the maintenance power box, and can directly obtain the longitude and latitude coordinates of the maintenance power box through GPS signals, and send the location data of the device to the server through the wireless network.

[0090] The intelligent gateway module is used to receive the circuit breaker opening and closing status signals and the three-phase current data of each distribution circuit sent by the communication module, collect the high-voltage side data and the low-voltage side data of the transformer, and transmit the received and collected data to the system server;

[0091] Intelligent gateway module, used to receive the circuit breaker opening and closing status signals and three-phase current data of each distribution circuit transmitted by the communication module in the maintenance power box;

[0092] The intelligent gateway module is installed in the substation. In addition to receiving the circuit breaker opening and closing status signals and the three-phase current data of each distribution circuit transmitted by the communication module in the maintenance power box, it is also connected to the communication interface of the electrical circuit instrument on the high-voltage side and the low-voltage side of the distribution transformer through a communication cable to collect the high-voltage side data and the low-voltage side data of the distribution transformer.

[0093] In this example, the high-voltage side data is collected from the communication interface of the 6kV switch cabinet instrument device through the communication cable, and the transformer low-voltage side data is collected from the communication interface of the 0.4kV incoming cabinet instrument device through the communication cable.

[0094] The communication circuit in this embodiment is an RS485 communication cable.

[0095] The intelligent gateway device is connected to the system server via wireless transmission.

[0096] A communication module, used to transmit the circuit breaker opening and closing status signals and three-phase current data to the intelligent gateway module;

[0097] The communication module is installed in the maintenance power box and is connected to the circuit breaker opening and closing sensor and the current sensor, and is used to transmit the circuit breaker opening and closing state signal and three-phase current information to the intelligent gateway module.

[0098] The data communication between the communication module and the gateway device module can be through wired connection or wireless transmission. Preferably, this embodiment uses wireless transmission to transmit the data in the maintenance power box to the gateway device. This is a prior art and will not be repeated here.

[0099] like Figure 2 As shown, the management module includes a map submodule, a power distribution system topology submodule, a basic information submodule, and a load distribution submodule.

[0100] The map submodule integrates the API of the map service in the server application and the web page, and combines the location data of the maintenance power box with the map service through the API to display the location of the maintenance power box on the map. This is the existing technology and will not be repeated here.

[0101] The power distribution system topology submodule is used to create and display a power distribution system topology map;

[0102] The power distribution system topology diagram is a diagram used to show the connection relationship between the various components of the power distribution system, including the main equipment in the entire plant power distribution system: distribution transformers, high-voltage circuit breakers, low-voltage circuit breakers, maintenance power boxes, temporary power loads;

[0103] In this embodiment, the main equipment includes: distribution transformer, 6kV side circuit breaker of distribution transformer, 0.4kV incoming line switch, 0.4kV distribution room bus, maintenance power box, transmission line and temporary power load.

[0104] The power distribution system topology diagram includes transformer data, high-voltage circuit breaker data, low-voltage circuit breaker data and maintenance power supply box data; the transformer data includes high-voltage side data and low-voltage side data; the high-voltage circuit breaker data includes high-voltage circuit breaker operating current and high-voltage circuit breaker switch status; the low-voltage circuit breaker data includes low-voltage circuit breaker operating current and low-voltage circuit breaker switch status; the maintenance power supply box data includes power supply box switch status, three-phase current data and each distribution circuit information;

[0105] The power distribution circuit information includes: circuit operating current, circuit switch rated current and circuit switch status; the circuit switch status includes disconnection and connection.

[0106] It is understandable that judging whether the corresponding circuit breaker is connected or disconnected from the circuit breaker opening and closing state signal is a prior art and will not be described in detail here. The switch state of the power box includes connection and disconnection;

[0107] The distribution transformer, high-voltage circuit breaker, low-voltage circuit breaker, and maintenance power supply box in the distribution system topology submodule are respectively bound to the data and basic information data collected by the intelligent gateway, and are displayed in the distribution system topology.

[0108] The data displayed on the transformer in the distribution system topology diagram include the rated current, operating current, voltage, active power, power factor, etc. of the high / low voltage side of the transformer; the data displayed on the 6kV side circuit breaker include the operating current, switch status, etc.; the data displayed on the 0.4kV incoming line switch include the operating current, switch status, etc.; the data displayed on the maintenance power box include the operating current, switch status, etc. of each distribution circuit.

[0109] The basic information submodule is used to enter, store and manage the basic information of the main equipment in the above-mentioned distribution system topology diagram submodule, such as the rated capacity and rated current of the distribution transformer; the rated current of the main power switch in the maintenance power box and the rated current of each distribution circuit switch.

[0110] In addition to the data and basic information data collected by the intelligent gateway module, the management module also automatically calculates relevant data and judgment results according to the corresponding algorithm for display, such as:

[0111] (1) Transformer load factor, calculated by dividing transformer operating current by rated current;

[0112] (2) The unbalance degree of the three-phase current of the transformer is given by (I 最大值 -I 最小值 ) / The average value of three-phase current is calculated;

[0113] (3) The results of the transformer economic operation are as follows: According to GBT13462-2008 Economic Operation of Power Transformers, the upper limit load factor of the transformer's optimal economic operation zone is 0.75, and the lower limit load factor of the optimal economic operation zone is 1.33β 2 JZ The management module makes a decision based on the transformer load rate. The transformer load rate is between [1.33β 2 JZ , 0.75], the system is judged to be economical, and otherwise it is judged to be uneconomical.

[0114] β JZis the comprehensive power economic load factor of the transformer, and the calculation formula is:

[0115]

[0116] Among them, P oz is the comprehensive power no-load loss, in kW; P kz is the comprehensive power load loss, in kW; K T The load fluctuation loss coefficient is the ratio of the transformer load loss under load fluctuation conditions within a certain period of time to the load loss under average load conditions. The above data is used as the basis for the temporary power load distribution at the construction site.

[0117] The load distribution submodule is used to screen out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters after the transformer is connected to each screened maintenance power supply box and the corresponding distribution circuit according to the distribution system topology diagram, and finally score the transformer load parameters according to the preset scoring criteria to select the distribution circuit with the highest score as the final temporary power load distribution plan, and locate and mark it in the map submodule;

[0118] Specifically include:

[0119] Create temporary power load information, where the temporary power load information includes temporary power load location, temporary power load current, and temporary power load type;

[0120] The temporary power load location can be obtained by inputting location information or longitude and latitude information in a map, or by directly selecting it in a map. Preferably, in this embodiment, the power load location is directly selected on a map. How to convert the location information or the location information selected from a map into the corresponding longitude and latitude information is a prior art and will not be described in detail here.

[0121] The temporary power load type is three-phase load or single-phase load;

[0122] Select the maintenance power supply box and the corresponding power distribution circuit according to the temporary power load position and temporary power load current;

[0123] The transformer load parameters include transformer operating current I', transformer three-phase electrical imbalance ΔI%' and transformer load rate β'.

[0124] The principle for matching the load distribution submodule with the maintenance power supply box and the corresponding power distribution circuit is:

[0125] 1) Select the first pre-selected maintenance power supply box within a preset radius R according to the temporary power load location;

[0126] The preset radius R is selected according to the specific requirements of the construction site. Preferably, the preset radius R in this embodiment is 200 meters;

[0127] 2) According to the temporary power load current, select from the first pre-selected maintenance power supply box a distribution circuit whose circuit switch rated current meets the requirements and whose circuit switch state is disconnected;

[0128] The rated current of the loop switch refers to the maximum current value that the switch can safely carry. When screening and matching, the system will check each loop switch in the maintenance power box to ensure that its rated current is greater than or equal to the temporary power load current. This is to ensure that the loop switch will not be damaged due to overload and to ensure power safety. That is, the rated current of the loop switch meets the requirements of the temporary power load current, which means that the rated current of the loop switch is greater than or equal to the temporary power load current.

[0129] According to the distribution system topology diagram, the transformer load parameters of the distribution transformer after the distribution circuit of each screened maintenance power box is connected are calculated and scored, including:

[0130] 3) According to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameters after the low-voltage side of the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit are calculated;

[0131] Because the construction site mainly uses the current and voltage on the low-voltage side of the distribution transformer for construction work, this embodiment mainly considers the impact of each distribution circuit on the low-voltage side of the distribution transformer after it is connected to the entire distribution system. Therefore, the transformer load parameters compared in the subsequent scoring are all transformer load parameters on the low-voltage side of the distribution transformer.

[0132] The calculation formula of transformer operating current I' is: I'=I+I L

[0133] Among them, I' is the low-voltage side operating current of the distribution transformer after connecting to the distribution circuit; I is the low-voltage side operating current of the distribution transformer before connecting to the distribution circuit; I L Temporary power load current.

[0134] The three-phase current unbalance ΔI%' refers to the degree of unbalance between the three-phase currents in a three-phase power system. The calculation formula is: ΔI%' = (I' 最大值 -I' 最小值 ) / I d ';

[0135] Among them, I 最大值 It is the maximum current in the three phases after the temporary power load is connected; I' 最小值It is the minimum current in the three phases after the temporary power load is connected; I d ' is the average value of the three-phase current after the temporary power load is connected, and the calculation formula is I d '=(I A '+I B '+I C ') / 3, where I A ', I B ', I C ' are the load currents of the three phases A, B and C of the transformer after the temporary power load is connected.

[0136] Only when the temporary power load type connected is a single-phase load, the three-phase load current and three-phase current imbalance on the low-voltage side of the distribution transformer are calculated when the distribution circuit is connected to different phases A, B, and C respectively;

[0137] It is understandable that the circuit breaker can be connected to one phase of the three-phase electricity. In actual applications, according to the load requirements, the circuit breaker can be connected to any phase of the three-phase electricity. This is the existing technology and will not be described in detail here.

[0138] For example, if a single-phase load is connected to phase A, the load current of phase A will increase, while the load currents of phases B and C will remain unchanged.

[0139] Calculate the three-phase current imbalance: After the single-phase load is connected, calculate the maximum, minimum and average values ​​of the three-phase current of the distribution transformer, and then use the above three-phase current imbalance formula for calculation.

[0140] For example, suppose a single-phase load is connected to phase A, increasing the current I L ,So:

[0141] Phase A current becomes I A '=I A +I L ;

[0142] The currents of phase B and phase C remain unchanged, and are I B '=I B and I C '=I C ;

[0143] Among them, I A ,I B ,I C are the operating currents of the three phases A, B, and C of the current transformer; I A ' is the transformer operating current after phase A is connected to the temporary power load;

[0144] Calculate the average value of the three-phase current I d ':I d '=(IA '+I B '+I C ') / 3

[0145] Find I A ', I B ', I C The maximum value in ' is set to I' 最大值 , the minimum value is set to I' 最小值 ;

[0146] Then I' 最大值 , I' 最小值 , I d Substitute the value of ' into the three-phase current imbalance calculation formula to obtain the three-phase current imbalance ΔI%' when the A phase current is connected A .

[0147] Similarly, the three-phase current unbalance ΔI%' when the B phase current is connected can be obtained B And the three-phase current imbalance when the C phase current is connected ΔI%' C .

[0148] The load rate β' refers to the ratio of the actual operating current of the transformer to its rated current. The calculation formula is: β' = I' / I N ;

[0149] Where I′ is the low-voltage side operating current of the distribution transformer after it is connected to the distribution circuit; I N is the rated current of the transformer.

[0150] Finally, the transformer load parameters are scored according to the preset scoring criteria, and the distribution circuit with the highest score is selected as the final temporary power load distribution plan, which includes:

[0151] 4) By comparing the difference between the load rate and the economic operation load rate before and after the distribution transformer is connected to each distribution circuit, the distance between the temporary power load location and the maintenance power box, and the three-phase current imbalance when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring criteria, and a temporary power load distribution plan is generated for the three-phase load according to the principle of load rate score first and distance score second; for single-phase load, the load rate, three-phase current imbalance score and distance score are comprehensively considered to generate a temporary power load distribution plan.

[0152] Compare the load rates of the distribution transformer before and after it is connected to the temporary power load with the transformer's economic operation load rate;

[0153] The economic operation load rate range is [1.33β 2 JZ , 0.75], β JZis the comprehensive power economic load factor of the transformer;

[0154] If the temporary power load connected is a single-phase load, compare the three-phase current unbalance degree on the low-voltage side of the distribution transformer when the temporary power load is connected to different phases of A, B, and C respectively;

[0155] Compare the distance between the location of the temporary power load and the maintenance power supply box where the distribution circuit is located.

[0156] Score according to the data comparison result, and the score includes: load rate score, distance score, and three-phase current unbalance degree score.

[0157] Criterion 1: Obtain the load rate score according to the comparison between the load rate before and after connecting the temporary power load and the economic operation load rate;

[0158] If the load rate is within the economic operation load rate range after connecting to the distribution circuit, the distribution circuit gets 5 points;

[0159] If the load rate is within the economic operation load rate range before connecting to the distribution circuit and the load rate is not within the economic operation range after connecting the temporary power load, the distribution circuit gets 0 points;

[0160] If the load rates before and after connecting to the distribution circuit are not within the economic operation load rate range, compare the differences between them and the economic operation load rate range. If the difference after connecting to the distribution circuit is less than the difference before connecting, the distribution circuit gets 3 points; if the difference after connecting to the distribution circuit is greater than or equal to the difference before connecting, the distribution circuit gets 1 point;

[0161] Specifically, if the load rate of the distribution transformer is less than the lower limit value of the economic operation load rate before connecting to the distribution circuit, compare it with the lower limit value. If it is higher than the upper limit value of the economic operation load rate, compare it with the upper limit value to obtain the absolute value of the load rate difference D1 before connecting; after connecting to the distribution circuit, compare the load rate of the distribution transformer after connecting to the distribution circuit with the comparison limit value before connecting to obtain the absolute value of the load rate difference D2 after connecting;

[0162] If D2 < D1, the distribution circuit gets 3 points;

[0163] If D2 >= D1, the distribution circuit gets 1 point.

[0164] Criterion 2: Obtain the distance score according to the comparison of the distance between the location of the temporary power load and the maintenance power supply box where the distribution circuit is located;

[0165] If the distance between the location of the temporary power load and the maintenance power supply box is less than R / 4, the distance score is 5 points;

[0166] If the distance between the temporary power load location and the maintenance power box is greater than or equal to R / 4 and less than or equal to R / 2, the distance score is 3 points;

[0167] If the distance between the temporary power load location and the maintenance power box is greater than R / 2 and less than or equal to R, the distance score is 1 point.

[0168] For example, in this example, the preset radius R is 200 meters. If the distance is less than 50 meters, 5 points are awarded; if the distance is between [50, 100] meters, 3 points are awarded; and if the distance is between (100-200] meters, 1 point is awarded.

[0169] Criteria 3: If the temporary power load is a single-phase load, the three-phase current imbalance score is calculated based on the three-phase current imbalance on the low-voltage side of the distribution transformer when the distribution circuit is connected to different phases;

[0170] If the temporary power load connected is a single-phase load, compare the three-phase current imbalance of the transformer when the temporary power load is connected to different phases A, B, and C respectively.

[0171] Substitute the current values ​​after the distribution circuit is connected to phase A, phase B, and phase C into the formula: three-phase current imbalance ΔI%'=(I' 最大值 -I' 最小值 ) / I d ', calculate the three-phase unbalance of the low-voltage side of the distribution transformer when connected to three different phases;

[0172] According to the values ​​of the three-phase current imbalance on the low-voltage side of the distribution transformer when connected to three different phases, they are ranked from small to large and get 5 points, 3 points, and 1 point respectively.

[0173] The system generates a temporary power load distribution plan based on the individual scoring results according to the following priority principles:

[0174] If it is a three-phase load, consider criterion 1 and criterion 2

[0175] Priority 1: Load Factor Score

[0176] Priority 2: Distance Score

[0177] This embodiment provides a specific implementation of the temporary power load distribution solution under three-phase load conditions:

[0178] 1. First compare the priority 1, that is, compare the load rate scores of the low-voltage side of the distribution transformer after connecting to each distribution circuit, sort them from high to low according to the scores, and the distribution circuit with the highest score is allocated to the temporary power load as the optimal solution;

[0179] 2. If there are multiple distribution circuits with the same priority 1 score, the priority 2 is further compared, that is, the distance scores of the maintenance power boxes where the distribution circuits are located are compared, and the distribution circuit with the highest score is allocated as the optimal solution to the temporary power load.

[0180] If there are still multiple distribution circuits with the same priority level 1 and priority level 2, a distribution circuit is randomly selected from them as the optimal solution and allocated to the temporary power load for access;

[0181] This embodiment provides a specific implementation of the temporary power load distribution solution under single-phase load conditions:

[0182] If it is a single-phase load, consider criteria 1, 2 and 3

[0183] Priority 1: Load factor score + three-phase current imbalance score

[0184] Priority 2: Distance Score

[0185] 1. First compare the priority 1, that is, compare the sum of the low-voltage side load rate score and the three-phase current imbalance score of the distribution transformer after connecting to each distribution circuit, sort them from high to low according to the score, and the distribution circuit with the highest score is allocated to the temporary power load as the optimal solution;

[0186] 2. If there are multiple distribution circuits with the same priority 1 score, the priority 2 is further compared, that is, the distance scores of the maintenance power boxes where the distribution circuits are located are compared, and the distribution circuit with the highest score is allocated as the optimal solution to the temporary power load.

[0187] If there are still multiple distribution circuits with the same priority level 1 and priority level 2, a distribution circuit is randomly selected from them as the optimal solution and allocated to the temporary power load for access;

[0188] Finally, the location of the maintenance power box where the distribution circuit of the optimal solution is located is located and marked in the map sub-module to guide the staff to quickly find the location of the corresponding maintenance power box for subsequent operations.

[0189] It is worth noting that in the above-mentioned embodiment of a temporary power load management system for a construction site, the various units and modules included are divided only according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0190] This embodiment adopts a temporary power load management system for construction sites. By establishing a distribution system topology diagram, it can obtain load parameters of transformers, maintenance power boxes, etc. in the distribution system in real time, and allocate temporary power according to the load conditions of each distribution transformer, so that the transformer load distribution is more reasonable, effectively solving the problems of unbalanced three-phase load distribution and economical operation of the transformer.

[0191] In addition, this embodiment clearly displays the location information of all maintenance power boxes through the map submodule, and when the optimal power distribution circuit is screened out, the location of the corresponding maintenance power box can be quickly found.

[0192] Embodiment 2

[0193] refer to Figure 3 This embodiment discloses a method for managing temporary power load at a construction site, which is used in a temporary power load management system at a construction site in the above embodiment, and includes the following steps:

[0194] S1. Create temporary power load information, where the temporary power load information includes temporary power load location, temporary power load current, and temporary power load type;

[0195] The temporary power load location can be obtained by inputting location information or longitude and latitude information in a map, or by directly selecting it in a map. Preferably, in this embodiment, the power load location is directly selected on a map. How to convert the location information or the location information selected from a map into the corresponding longitude and latitude information is a prior art and will not be described in detail here.

[0196] The temporary power load type is three-phase load or single-phase load;

[0197] S2. Filter out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters after the distribution transformers of each filtered maintenance power supply box are connected to the temporary power load according to the distribution system topology diagram, score them according to the preset scoring criteria, generate the final temporary power load distribution plan, and locate and mark them on the map;

[0198] The transformer load parameters include transformer operating current I', transformer three-phase electrical imbalance ΔI%' and transformer load rate β';

[0199] The preset scoring criteria include:

[0200] 1) Obtain the load rate score based on the comparison between the load rate before and after the temporary power load is connected and the economic operation load rate:

[0201] If the load rate after connecting to the distribution circuit is within the economic operation load rate range, the distribution circuit will get 5 points;

[0202] If the load rate is within the economic operation load rate range before connecting to the distribution circuit, but is not within the economic operation range after connecting to the temporary power load, the distribution circuit will get 0 points;

[0203] If the load rate before and after the connection to the distribution circuit is not within the economic operation load rate range, the difference between the two and the economic operation load rate range is compared. If the difference after the connection to the distribution circuit is less than the difference before the connection, the distribution circuit will get 3 points; if the difference after the connection to the distribution circuit is greater than or equal to the difference before the connection, the distribution circuit will get 1 point;

[0204] 2) Obtain a distance score by comparing the distance between the temporary power load location and the maintenance power box where the power distribution circuit is located;

[0205] If the distance between the temporary power load location and the maintenance power box is less than R / 4, the distance score is 5 points;

[0206] If the distance between the temporary power load location and the maintenance power box is greater than or equal to R / 4 and less than or equal to R / 2, the distance score is 3 points;

[0207] If the distance between the temporary power load location and the maintenance power box is greater than R / 2 and less than or equal to R, the distance score is 1 point;

[0208] 3) If the temporary power load is a single-phase load, the three-phase current imbalance score is calculated based on the three-phase current imbalance on the low-voltage side of the distribution transformer when the distribution circuit is connected to different phases;

[0209] Substitute the current values ​​after the distribution circuit is connected to phase A, phase B, and phase C into the formula: three-phase current imbalance ΔI%'=(I' 最大值 -I' 最小值 ) / I d ', calculate the three-phase unbalance of the low-voltage side of the distribution transformer when connected to three different phases;

[0210] According to the values ​​of the three-phase current unbalance degree on the low-voltage side of the distribution transformer when connected to three different phases, they are ranked from small to large, and they are scored 5 points, 3 points, and 1 point respectively;

[0211] Among them, I 最大值 It is the maximum current in the three phases after the temporary power load is connected; I' 最小值 It is the minimum current in the three phases after the temporary power load is connected; I d ' is the average value of three-phase current after connecting to temporary power load;

[0212] Specifically include:

[0213] S21, selecting a first pre-selected maintenance power supply box within a preset radius R according to the temporary power load position;

[0214] The preset radius R is selected according to the specific requirements of the construction site. Preferably, the preset radius R in this embodiment is 200 meters;

[0215] S22, selecting, from the first pre-selected maintenance power supply box, a distribution circuit whose switch rated current meets the temporary power load current requirement and whose circuit switch state is disconnected according to the temporary power load current;

[0216] S23, according to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameter of the low-voltage side of the distribution transformer after the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit is calculated;

[0217] S24. If the temporary power load type is a three-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate and the distance between the temporary power load position and the maintenance power box, the distribution circuit is scored according to the preset scoring standard, and a temporary power load distribution plan is generated according to the principle of giving priority to the load rate score and secondarily to the distance score;

[0218] The temporary power load distribution plan is generated according to the principle of load rate score first and distance score second, as follows:

[0219] Compare the load rate scores of the low-voltage side of the distribution transformers after connecting to each distribution circuit, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

[0220] If the temporary power load type is single-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, the distance between the temporary power load position and the maintenance power box, and the three-phase current imbalance on the low-voltage side of the distribution transformer when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring standard, and the temporary power load distribution plan is generated according to the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and the distance score;

[0221] The temporary power load distribution plan is generated according to the principle that the sum of the load rate score and the three-phase current imbalance score is given priority, and the distance score is second, as follows:

[0222] Compare the load rate score of the low-voltage side of the distribution transformer after connecting to each distribution circuit and the sum of the three-phase current imbalance scores, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate score and the sum of the three-phase current imbalance scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

[0223] S25. The location of the maintenance power box where the power distribution circuit of the optimal solution is located is located and marked in the map submodule to guide the staff to quickly find the location of the corresponding maintenance power box for subsequent operations.

[0224] This embodiment adopts a temporary power load management method for construction sites. By establishing a distribution system topology diagram, load parameters of transformers, maintenance power boxes, etc. in the distribution system can be obtained in real time. Temporary power supply is allocated according to the load conditions of distribution transformers connected to different distribution circuits, making the load distribution of distribution transformers more reasonable and effectively solving the problems of unbalanced three-phase load distribution and economical operation of distribution transformers.

[0225] It should be noted that the module embodiments described above are merely schematic, wherein the units / modules described as separate components may or may not be physically separated, and the components displayed as units / modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the accompanying drawings of the system embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without creative work.

[0226] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A temporary power load management system for a construction site, characterized in that: Including distribution transformer, N maintenance power boxes, sensor equipment module, GPS module, intelligent gateway module, communication module, system server and management module: Distribution transformer, including high voltage side and low voltage side; the voltage of low voltage side is lower than that of high voltage side; The maintenance power supply box includes a power circuit breaker and M power distribution circuits; the power circuit breaker is used to control the disconnection and connection of the maintenance power supply box; the power distribution circuit includes a circuit breaker for controlling the disconnection and connection of the power distribution circuit; A sensor device module is used to collect the circuit breaker opening and closing state signals and the three-phase current data of each distribution circuit in the maintenance power supply box; the sensor device module includes a circuit breaker opening and closing sensor and a current sensor; the circuit breaker includes a power circuit breaker and a circuit breaker of each distribution circuit; GPS module, used to obtain the location information of the power box under maintenance and send it to the system server; The intelligent gateway module is used to receive the circuit breaker opening and closing status signals and the three-phase current data of each distribution circuit sent by the communication module, collect the high-voltage side data and the low-voltage side data of the transformer, and transmit the received and collected data to the system server; A communication module, used to transmit the circuit breaker opening and closing state signals and three-phase current data obtained by the sensor device module to the intelligent gateway module; The management module includes a map submodule, a power distribution system topology submodule, a basic information submodule, and a load distribution submodule; Map submodule: used to display the location of the maintenance power box and corresponding data on the map according to the data in the system server; Power distribution system topology diagram submodule: used to create and display the power distribution system topology diagram; the power distribution system topology diagram includes transformer data and maintenance power supply box data; the transformer data includes high-voltage side data and low-voltage side data; the low-voltage circuit breaker data includes the low-voltage circuit breaker operating current and the low-voltage circuit breaker switch status; the maintenance power supply box data includes the power supply box switch status, three-phase current data and each distribution circuit information; the distribution circuit information includes: circuit operating current, circuit switch rated current and circuit switch status; the circuit switch status includes disconnection and connection; Basic information submodule: used to input, store and manage data information in the power distribution system topology submodule; The load distribution submodule is used to screen out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters after the transformer is connected to the screened maintenance power supply box and the corresponding distribution circuit according to the distribution system topology diagram, and finally score the transformer load parameters according to the preset scoring criteria to select the distribution circuit with the highest score as the final temporary power load distribution plan, and locate and mark it in the map submodule; the temporary power load information includes the temporary power load location, temporary power load current, and temporary power load type; the temporary power load type is three-phase load or single-phase load; the transformer load parameters include transformer operating current, three-phase current imbalance and load rate; the preset scoring criteria include load rate score, distance score and three-phase imbalance score.

2. The temporary power load management system according to claim 1, characterized in that: The load distribution submodule specifically includes: According to the temporary power load position, select the first pre-selected maintenance power supply box within the preset radius R; According to the temporary power load current, select from the first pre-selected maintenance power supply box a distribution circuit whose switch rated current meets the temporary power load current requirement and whose circuit switch state is disconnected; According to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameters on the low-voltage side of the distribution transformer after the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit are calculated; If the temporary power load type is three-phase load, the distribution circuit is scored according to the preset scoring criteria by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, as well as the distance between the temporary power load location and the maintenance power box. A temporary power load distribution plan is generated based on the principle of giving priority to load rate scores and secondarily to distance scores.

3. The temporary power load management system according to claim 2, characterized in that: The temporary power load distribution plan is generated according to the principle of load rate score first and distance score second, as follows: Compare the load rate scores of the low-voltage side of the distribution transformers after connecting to each distribution circuit, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

4. The temporary power load management system according to claim 2, characterized in that: The load distribution submodule also includes: If the temporary power load type is single-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, the distance between the temporary power load location and the maintenance power box, and the three-phase current imbalance on the low-voltage side of the distribution transformer when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring criteria, and a temporary power load distribution plan is generated based on the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and followed by the distance score.

5. The temporary power load management system according to claim 4, characterized in that: The temporary power load distribution plan is generated according to the principle that the sum of the load rate score and the three-phase current imbalance score is given priority, and the distance score is second, as follows: Compare the load rate score of the low-voltage side of the distribution transformer after connecting to each distribution circuit and the sum of the three-phase current imbalance scores, sort them from high to low, and allocate the distribution circuit with the highest score as the optimal solution to the temporary power load access; if there are multiple distribution circuits with the same load rate score and the sum of the three-phase current imbalance scores, further compare the distance scores of the maintenance boxes where the distribution circuits are located, and allocate the distribution circuit with the highest distance score as the optimal solution to the temporary power load access.

6. The temporary power load management system according to claim 1, characterized in that: The preset scoring criteria specifically include: 1) Obtain the load rate score based on the comparison between the load rate before and after the temporary power load is connected and the economic operation load rate: If the load rate after connecting to the distribution circuit is within the economic operation load rate range, the distribution circuit will get 5 points; If the load rate is within the economic operation load rate range before connecting to the distribution circuit, but is not within the economic operation range after connecting to the temporary power load, the distribution circuit will get 0 points; If the load rate before and after the connection to the distribution circuit is not within the economic operation load rate range, the difference between the two and the economic operation load rate range is compared. If the difference after the connection to the distribution circuit is less than the difference before the connection, the distribution circuit will get 3 points; if the difference after the connection to the distribution circuit is greater than or equal to the difference before the connection, the distribution circuit will get 1 point; 2) Obtain a distance score by comparing the distance between the temporary power load location and the maintenance power box where the power distribution circuit is located; If the distance between the temporary power load location and the maintenance power box is less than R / 4, the distance score is 5 points; If the distance between the temporary power load location and the maintenance power box is greater than or equal to R / 4 and less than or equal to R / 2, the distance score is 3 points; If the distance between the temporary power load location and the maintenance power box is greater than R / 2 and less than or equal to R, the distance score is 1 point; 3) If the temporary power load is a single-phase load, the three-phase current imbalance score is calculated based on the three-phase current imbalance on the low-voltage side of the distribution transformer when the distribution circuit is connected to different phases; Substitute the current values ​​after the distribution circuit is connected to phase A, phase B, and phase C into the formula: three-phase current imbalance ΔI%'=(I' 最大值 -I' 最小值 ) / I d ', calculate the three-phase unbalance of the low-voltage side of the distribution transformer when connected to three different phases; According to the values ​​of the three-phase current unbalance degree on the low-voltage side of the distribution transformer when connected to three different phases, they are ranked from small to large, and they are scored 5 points, 3 points, and 1 point respectively; Among them, I 最大值 It is the maximum current in the three phases after the temporary power load is connected; I' 最小值 It is the minimum current in the three phases after the temporary power load is connected; I d ' is the average value of three-phase current after temporary power load is connected.

7. The temporary power load management system according to claim 1, characterized in that: The circuit breaker opening and closing sensor, the current sensor, the GPS module and the communication module are installed in the maintenance power box; the communication module is connected with the circuit breaker opening and closing sensor and the current sensor.

8. The temporary power load management system according to claim 1, characterized in that: The intelligent gateway module is installed in the substation and connected to the communication interfaces of the electrical circuit instruments on the high-voltage side and the low-voltage side of the distribution transformer through communication cables.

9. A method for managing temporary power load at a construction site, based on a temporary power load management system for a construction site according to any one of claims 1 to 8, characterized in that: The method comprises: S1, new temporary power load information; S2. Filter out the maintenance power supply box and the corresponding distribution circuit according to the temporary power load information, and then calculate the transformer load parameters after the distribution transformers of each filtered maintenance power supply box are connected to the temporary power load according to the distribution system topology diagram, score them according to the preset scoring criteria to generate the final temporary power load distribution plan, and locate and mark them on the map; specifically including: S21, selecting a first pre-selected maintenance power supply box within a preset radius R according to the location of the temporary power load; S22, selecting, from the first pre-selected maintenance power supply box, a distribution circuit whose switch rated current meets the temporary power load current requirement and whose circuit switch state is disconnected according to the temporary power load current; S23, according to the temporary power load current and power load type, the load current is matched to the qualified maintenance power supply box distribution circuit respectively, and according to the distribution system topology diagram, the transformer load parameter of the low-voltage side of the distribution transformer after the distribution transformer supplying power to the maintenance power supply box is connected to the distribution circuit is calculated; S24. If the temporary power load type is a three-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate and the distance between the temporary power load position and the maintenance power box, the distribution circuit is scored according to the preset scoring standard, and a temporary power load distribution plan is generated according to the principle of giving priority to the load rate score and secondarily to the distance score; S25. The location of the maintenance power box where the power distribution circuit of the optimal solution is located is located, marked and displayed in the map submodule.

10. The temporary power load management method according to claim 9, characterized in that: Step S24 also includes: If the temporary power load type is single-phase load, by comparing the difference between the load rate before and after the distribution transformer is connected to each distribution circuit and the economic operation load rate, the distance between the temporary power load location and the maintenance power box, and the three-phase current imbalance on the low-voltage side of the distribution transformer when the single-phase load is connected to different phases, the distribution circuit is scored according to the preset scoring criteria, and a temporary power load distribution plan is generated based on the principle of giving priority to the sum of the load rate score and the three-phase current imbalance score and followed by the distance score.

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