CN105529823A - Terminals and terminal building system based on electric load management intelligent recognition system - Google Patents
Terminals and terminal building system based on electric load management intelligent recognition system Download PDFInfo
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Abstract
The invention discloses terminals and a terminal building system based on an electric load management intelligent recognition system. The electric load management intelligent recognition system comprises a frequency selection circuit; the frequency selection circuit comprises an active band pass filter formed by an integrated operational amplifier and an RC network; the terminals comprise a power interface, a current sensor, a voltage sensor ASSS, an A/D conversion module, a communication module, a relay control module and output jacks; the terminal building system comprises a server, a communication network, multiple terminal electric devices, multiple electric load management intelligent recognition system terminals, and multiple concentrator. Through the above technical scheme, through carriers of the frequency selection circuit, terminals formed by the recognition system can be recognized, and the terminal building system can realize power supply, power control, power limit, meter reading and charging; and electric detection and measurement can be carried out by the multiple terminal electric devices, timely alarming and forced power cutoff can be carried out, records can be exchanged with the server, and detection, control and safety are improved.
Description
Technical field
The invention discloses a kind of terminal based on electricity consumption load management intelligent identifying system and terminal builds system.
Background technology
At present, the personnel such as institution of higher learning's student dormitory, employee dormitory live than the environment Electrical Safety problem of comparatively dense, are subject to manager gradually and pay much attention to.Suffer from for effectively preventing or eliminating fire, need control high-power or there is the electric heating load of potential safety hazard, as electric furnace, immersion heater, electric iron etc., intelligent monitoring technology effectively for the detection of this type of bad load, therefore can obtain and applies more and more widely.At present, intelligent monitoring terminal is only used to identify the purely resistive load (as electric heater, electric furnace, electric blanket etc.) in linear load usually.Now, the intelligent monitoring terminal that domestic contrast is popular mainly contains: IC-card control system: major function is that charging controls; To ration the power supply control cubicle: a given peak load, as threshold values, exceedes threshold values and has a power failure; Multi-functional electricity-using control cubicle: can automatic charging, by setting threshold values ration the power supply.China's power supply management automation is mainly used in electric power system peak load shifting and load balance, is intended to improve mains supply safety and electric energy application efficiency.The management of power use then only lays particular emphasis on the reform of the measurement means such as remote meter reading, IC-card ammeter, at present, China's supply of electric power ability improves day by day, and it is real by the integrated management of electricity consumption, it is in the ascendant that centralized and unified management system is included in such as remote meter reading, time controling, remained capacity, load restriction and fault warning etc. in, and making full use of network advantage, to carry out the centralized unified management of electricity consumption then at the early-stage.
The centralized power consuming administrative system of majority on market and intelligent load identifier (also known as Intelligent cutoff) its basic functional principle are: detect whether resistive load, as long as resistive load is with regard to power-off, control.But, the limitation of this kind of following several aspect of electricity consumption TT&C system ubiquity: (1) effectively can not screen the character of resistive load (using the electrical equipment etc. still not allowing to use as allowed); (2) to the inductive load air-conditioning of large electrical power, capacitive load cannot Detection & Controling; (3) uninterrupted, time controling (but metering electric charge) of not rationed the power supply in the public emergent lighting space such as toilet, passageway of living in intensive power utilization environment to personnel cannot realize.(4) effectively fault detect can not be carried out to common by electric loading, and alarm.
Summary of the invention
The present invention is in order to solve the problem of prior art, provide a kind of based on electricity consumption load management intelligent identifying system, comprise frequency selection circuit, described frequency selection circuit comprises the active band-pass filter be made up of integrated transporting discharging and RC network, the harmonic wave that described active band-pass filter is produced by nonlinear load, the harmonic wave that described nonlinear load produces all pass through the nonlinear characteristic generation of the switching manipulation of semiconductor thyristor and diode, semiconductor thyristor.
Limit further as the present invention, the centre frequency of described frequency selection circuit chooses 3 times, 5 subfrequencies, namely chooses 150Hz and 250Hz.
Limit further as the present invention, described source filter has amplification and cushioning effect concurrently, utilizes active filter can give prominence to the signal of optional frequency and suppress other irrelevant frequency signal.
Limit further as the present invention, the generation of described harmonic current number of times is relevant to the umber of pulse of power converter, and the harmonic current that same nonlinear load produces reduces with the increase of harmonic number.
The present invention is in order to solve the problem of prior art, provide a kind of terminal based on electricity consumption load management intelligent identifying system, comprise power interface, current sensor, voltage sensor, A/D modular converter, communication module, relay control module, output socket, it is characterized in that: this terminal also comprises frequency-selecting harmonic wave separation module, electric energy metering module, cpu load identification control module, described power interface passes through current sensor, after voltage sensor, current sensor, , voltage sensor is connected with electric energy metering module to be changed, described current sensor, , voltage sensor be connected with electric energy metering module change in separate a road and be connected with A/D modular converter and change, described current sensor can separate separately a road signal frequency-selecting harmonic wave separation module again to carry out frequency-selecting and isolates harmonic signal, after isolated harmonic signal amplifies, give A/D modular converter and carry out analog-to-digital conversion, the transformation result of conversion is input to cpu load identification control module by described A/D modular converter, undertaken performing and controlling by cpu load identification control module, and be connected with communication module and transmit, described cpu load identification control module is connected with relay control module, relay control module is connected with output socket.
The present invention is in order to solve the problem of prior art, and what provide a kind of terminal based on electricity consumption load management intelligent identifying system builds system, comprises server, communication network, multiple terminal power consumption equipment; This system also comprises multiple electricity consumption load management intelligent identifying system terminal, multiple concentrator, described server is by the connection of communication network and multiple concentrator, described multiple concentrator is connected with multiple electricity consumption load management intelligent identifying system terminal by communication network, and described multiple electricity consumption load management intelligent identifying system terminal is connected with multiple terminal power consumption equipment.
Limit further as the present invention, described communication network comprise power carrier, wireless, 485, Ethernet, CAN multiple communication modes.
Limit further as the present invention, described server connects with the communication network between concentrator for Ethernet connects, described concentrator be connected with the communication network of multiple terminal power consumption equipment can select power carrier, wireless, 485, any one communication modes in CAN.
Limit further as the present invention, described electricity consumption load management intelligent identifying system terminal identifies multiple terminal power consumption equipment, condition monitoring, judgement, control, and corresponding data are transferred to concentrator by communication network, by concentrator, data are put on communication network, are transferred to server through communication network and carry out data operation, analysis, judgement and storage.
Advantageous Effects of the present invention: 1, use hardware circuit, comb filtering technology is utilized to carry out synchronization discrete to first-harmonic, harmonic parameters in sampling load, thus realize first-harmonic, the measurement of harmonic parameters Fast synchronization, thus the time varying characteristic of these parameters is utilized to carry out loadtype identification.This technology greatly reduces the burden of software algorithm, improves system response time; 2, software algorithm: the dispersion effect utilizing different loads harmonic wave, is used for the identification of loadtype by the time varying characteristic of first-harmonic, harmonic parameters, greatly reduce erroneous judgement risk; 3, register electrical equipment: in electric appliance load of the same type, utilize different loads power, the difference of harmonic dispersion effect sets up the registration table of limited quantity, can filter out in the load group forbidding type the load allowing to use; 4, various electro-detection and measurement can be carried out to this electrical equipment or power consumption equipment by electricity consumption load management intelligent identifying system terminal, the various electricity consumptions of measuring are utilized to carry out judging this electrical equipment or power consumption equipment running status, by multiple communication network remote alarm or control; There is collection power supply, control electricity, ration the power supply, distinguish loadtype and size, and carry out transfinite alarm and automatic forced power-off on this basis; 5, the electricity consumption load management intelligent identifying system terminal of the system of building of electricity consumption load management intelligent identifying system terminal is after identifying electrical equipment, can initiatively cut off the electricity supply, and submit record to by module and server, improve prosecution and fail safe, convenient operation.
Accompanying drawing explanation
Fig. 1 is the terminal structure schematic diagram that the present invention is based on electricity consumption load management intelligent identifying system.
Fig. 2 is the terminal inner system cloud gray model flow chart that the present invention is based on electricity consumption load management intelligent identifying system.
Fig. 3 be the terminal that the present invention is based on electricity consumption load management intelligent identifying system build system configuration schematic diagram.
In figure: power interface 1, current sensor 2, voltage sensor 3, A/D modular converter 4, electric energy metering module 5, cpu load identification control module 6, communication module 7, frequency-selecting harmonic wave separation module 8, concentrator 9, electric loading management intelligent identifying system terminal 10, server 11, relay control module 12, terminal power consumption equipment 13, communication network 14, output socket 15.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
Example of the present invention: a kind of electricity consumption load management intelligent identifying system, comprise frequency selection circuit, described frequency selection circuit comprises the active band-pass filter be made up of integrated transporting discharging and RC network, the harmonic wave that described active band-pass filter is produced by nonlinear load, the harmonic wave that described nonlinear load produces all pass through the nonlinear characteristic generation of the switching manipulation of semiconductor thyristor and diode, semiconductor thyristor.Described source filter has amplification and cushioning effect concurrently, utilize active filter can give prominence to the signal of optional frequency and suppress other frequency signal. the generation of described harmonic current number of times is relevant to the umber of pulse of power converter, the generation of harmonic current number of times is relevant to the umber of pulse of power converter, as 6 pulsing units only can produce 5, 7, 11, 13, 17, 19 ... nth harmonic electric current, the umber of pulse of power inverter is higher, the number of times of the frequency of the harmonic component of most low order is higher, and for other non-linear devices, as fluorescent lamp can produce 3 subharmonic currents by a relatively large margin.The harmonic current that same nonlinear load produces reduces with the increase of harmonic number.The centre frequency of described frequency selection circuit chooses 3 times, 5 subfrequencies, namely chooses 150Hz and 250Hz.
As shown in Figure 1, a kind of terminal based on electricity consumption load management intelligent identifying system, it comprises power interface 1, current sensor 2, voltage sensor 3, A/D modular converter 4, communication module 7, relay control module 12, output socket 15, described terminal also comprises frequency-selecting harmonic wave separation module 8, electric energy metering module 5, cpu load identification control module 6, after described power interface 1 connects current sensor 2 and voltage sensor 3, carry out being connected with electric energy metering module 5 simultaneously and change, calculate power measurement, transformation result is input to cpu load identification control module 6, calculate newly-increased load power consumption and judge according to the newly-increased character of load parameter to newly-increased load power consumption, mutually performed by cpu load identification control module 6 and controlled again, and transmitting with communication module and be connected, described current sensor 2, voltage sensor 3 connect in the process of electric energy metering module 5 also can separate a road respectively with entering to be connected with A/D modular converter 4, described current sensor 2 also can separate a road signal frequency-selecting harmonic wave separation module again to carry out frequency-selecting and isolates harmonic signal, after isolated harmonic signal amplifies, give A/D modular converter 4 and carry out analog-to-digital conversion, transformation result is input to cpu load identification control module 6, calculate newly-increased load parameter, and judge according to the character of newly-increased load parameter to newly-increased load, undertaken performing and controlling by cpu load identification control module 6 again, and be connected with communication module 7 and transmit, described cpu load identification control module 6 is connected 12 with relay control module, relay control module 12 is connected with output socket 15.Described newly-increased load refers to multiple terminal power consumption equipment, and the relay control module 12 be wherein connected with terminal power consumption equipment is at least provided with one, and its corresponding output socket also can at least be provided with one.Its terminal power consumption equipment, such as general electrical equipment: immersion heater, electric rice cooker, insulating pot, microwave oven, hair dryer, electric blanket even load.
As shown in Figure 2, a kind of internal operation step based on electricity consumption load management intelligent identifying system is as follows:
Step S100, user starts the terminal of enabling electricity consumption load management intelligent identifying system; The system initialization of the terminal inner of the electricity consumption load management intelligent identifying system after startup, reading system threshold value and history state.
Step S102 is to step S106, and system initialization starts connecting test between rear and communication module, whether passes through communication request, communication module is responsible for communicating with server, accept instruction, parameter, uploading data, if communication request is by just continuing to hold row system, if not by just interrupting.
Step S108 is to step S114, see again under checking and have no progeny whether there was zero flag, be still in interrupt status, if passed through in multi-channel data acquisition process, just change with the A/D modular converter that maximum 8 tunnels are synchronous, frequency-selecting harmonic wave separation module acquires analogue data; Electric energy metering module is from electric energy chip readout power, and by result stored in buffering area, calculation of parameter calculates electrical energy parameter according to data.
Step S116, cpu load controls current change quantity in the buffering area of identification module and starts this cpu load control identification module, is now judged character and the watt level of access load by newly-increased load parameter, by result stored in buffering area; Judge character and the watt level of the newly-increased load of access.
Step S118, this cpu load controls identification module and connects conversion by relay control module.
Step S120, relay control module is connected with terminal power consumption equipment, and this terminal power consumption equipment is connected with this terminal system the operation carrying out above-mentioned steps again.
As shown in Figure 3, a kind of terminal based on electricity consumption load management intelligent identifying system build system, comprise server 11, communication network 14, multiple terminal power consumption equipment 13; This system also comprises multiple electric loading management intelligent identifying system terminal 10, multiple concentrator 9, described server 11 is by the connection of communication network 13 with multiple concentrator 9, described multiple concentrator 9 manages intelligent identifying system terminal 10 by communication network 12 and multiple electric loading and is connected, and described multiple electric loading management intelligent identifying system terminal 10 is connected with multiple terminal power consumption equipment 12.Described server 11 and the communication link between concentrator 9 are that Ethernet connects, described concentrator 9 and multiple terminal power consumption equipment 13 by communication network connect can select power carrier, wireless, 485, any one mode communication modes of CAN carries out communication link.Described electric loading management intelligent identifying system terminal 10 identifies multiple terminal power consumption equipment 13, condition monitoring, judgement, control, and corresponding data are transferred to concentrator 9 by communication network, by concentrator 9, data are put on communication network, are transferred to server 11 through communication network 14 and carry out data operation, analysis, judgement and storage.Electric loading management intelligent identifying system terminal 10 identifies newly-increased load, judge, controls, and corresponding data with power carrier, wireless, 485, the mode such as CAN sends concentrator to, by concentrator 9, data are put on network, carry out data operation, analysis, judgement and storage through Internet Transmission to server 11.Wherein said newly-increased load comprises multiple terminal power consumption equipment 13, the plurality of terminal power consumption equipment 13 and electric loading manage intelligent identifying system terminal 10 and are connected, this builds in system, its concentrator, connection between electricity consumption load management intelligent terminal 10 and terminal power consumption equipment 13 can be one and arrive multiple, and its common transport carries out data operation, analysis, judgement and storage to server 11.
Following the present embodiment is a kind of builds further illustrating of system based on electricity consumption load management intelligent identifying system and terminal and terminal: in the present invention in electricity consumption load management intelligent identifying system, and the harmonic wave that nonlinear load produces is all caused by the nonlinear characteristic of the switching manipulation of semiconductor thyristor and diode, semiconductor thyristor.The generation of harmonic current number of times is relevant to the umber of pulse of power converter, as 6 pulsing units only can produce 5,7,11,13,17,19 ... nth harmonic electric current, the umber of pulse of power inverter is higher, the number of times of the frequency of the harmonic component of most low order is higher, and for other non-linear devices, as fluorescent lamp can produce 3 subharmonic currents by a relatively large margin.The harmonic current that same nonlinear load produces reduces with the increase of harmonic number.In sum, the centre frequency of frequency selection circuit chooses 3 times, 5 subfrequencies, namely chooses 150Hz and 250Hz.
Facts have proved, based on the electricity consumption load management intelligent identifying system that the present invention proposes, basis of the present invention successfully have developed the intelligent campus safety utilization of electric power observing and controlling based on MSP430 and management system.This intelligent and safe electricity consumption remained capacity system has carried out remained capacity quickly and accurately in the campus dormitory operation phase, effectively reduces erroneous judgement, fails to judge.Application practice shows, this remained capacity system is simple and practical, is suitable for embedding in Intelligent electricity use management system promoting.
Further, the terminal of electricity consumption load management intelligent identifying system have integrate power supply, control electricity, ration the power supply, check meter, the function such as charging, the two-way output control circuit that current sensor and voltage sensor export, can identify air-conditioning, illuminating lamp, computer, washing machine, refrigerator, water dispenser even load do not controlled; But the electrical equipment to general: immersion heater, electric rice cooker, insulating pot, microwave oven, hair dryer, electric blanket even load, several seconds internal cutting off power supplys.If to listing the electrical equipment prohibitted the use in, normal use can be recovered by the mode of registration.Loadtype and size can also be distinguished, and carry out transfinite alarm and automatic forced power-off on this basis; Value is transfinited in more than 250W alarm and pressure power-off to the electrical appliance load forbidden, and permanent historical record is carried out to act of violating regulations; Computer load or total load alarm and force outage threshold can set arbitrarily between 350W and 5000W, total load forces deenergization supply more than 5000W.This terminal, after identifying these electrical equipment, can initiatively be cut off the electricity supply, and submits record to server.After power-off, if user stops the use of violated electrical equipment in time, then power supply recovers after a few minutes automatically, otherwise continuous several times finds that violated electrical equipment disconnects not yet, then permanent shut-down power supply after recovering power supply.For the user of permanent shut-down, again must be restored electricity by keeper's operations server end.
Further, the system of building of the terminal of electricity consumption load management intelligent identifying system to selecting part terminal in whole terminal power consumption equipment and each terminal can set separately detection, management and control strategy, can limit size, the scope making electrical appliance, time-division transfer connecting and disconnecting of the circuit function that it uses power.The electricity charge can also be carried out by network to supplement with money in advance, kilowatt hour is used to deduct fees with in electric process by reality, supplement with money after using in advance, auto-breaking can be set or allow a certain amount of arrearage, and be applied to remote monitoring and detection are carried out to the running status of electric equipment, judge that power consumption equipment runs accordingly whether normal, by power carrier, Ethernet, wireless, 485, the multiple communication modes remote alarms such as CAN controlling.
The effect that this discovery produces is as follows: 1, use hardware circuit, comb filtering technology is utilized to carry out synchronization discrete to first-harmonic, harmonic parameters in sampling load, thus realize first-harmonic, the measurement of harmonic parameters Fast synchronization, thus the time varying characteristic of these parameters is utilized to carry out loadtype identification.This technology greatly reduces the burden of software algorithm, improves system response time; 2, software algorithm: the dispersion effect utilizing different loads harmonic wave, is used for the identification of loadtype by the time varying characteristic of first-harmonic, harmonic parameters, greatly reduce erroneous judgement risk; 3, register electrical equipment: in electric appliance load of the same type, utilize different loads power, the difference of harmonic dispersion effect sets up the registration table of limited quantity, can filter out in the load group forbidding type the load allowing to use; 4, various electro-detection and measurement can be carried out to this electrical equipment or power consumption equipment by electricity consumption load management intelligent terminal, utilize the various electricity consumptions of measuring to carry out judging this electrical equipment or power consumption equipment running status, by multiple communication network remote alarm or control; There is collection power supply, control electricity, ration the power supply, distinguish loadtype and size, and carry out transfinite alarm and automatic forced power-off on this basis; 5, electricity consumption load management intelligent terminal builds the electricity consumption load management intelligent terminal of system after identifying electrical equipment, initiatively can cut off the electricity supply, and submit record to by module and server, improve prosecution and fail safe, convenient operation.It is pointed out that above-mentioned preferred embodiment is only and technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1. an electricity consumption load management intelligent terminal, comprises external power source interface, current sensor, voltage sensor, A/D modular converter, communication module, relay control module, output socket; It is characterized in that: this terminal also comprises frequency-selecting harmonic wave separation module, electric energy metering module, the connection of cpu load identification control module and terminal inner thereof; Described A/D modular converter has integrated multipath A/D; Described communication module has the communication chip of low power consuming; The connection of described terminal inner comprises external power source interface and current sensor, voltage sensor connects, described current sensor, voltage sensor is connected with A/D modular converter, electric energy metering module, described current sensor and frequency-selecting harmonic wave separation model calling, described A/D modular converter, electric energy metering module is connected with cpu load identification control module respectively, described cpu load identification control module is connected with communication between communication module to be transmitted, described cpu load identification control module is connected with relay control module, and relay control module connects output socket.
2. electricity consumption load management intelligent terminal as claimed in claim 1, is characterized in that: described cpu load identification control module is 8051 series, AVR is serial, MSP430 is serial or ARM is serial.
3. electricity consumption load management intelligent terminal as claimed in claim 1, it is characterized in that: after described external power source interface connects current sensor, voltage sensor, carry out the conversion of A/D modular converter, cpu load identification control module calculates power consumption according to transformation result and is connected with communication module to be transmitted simultaneously, described current sensor separates a road signal frequency-selecting harmonic wave separation module again to carry out frequency-selecting and isolates harmonic signal, isolated harmonic signal amplification is given A/D modular converter and is carried out analog-to-digital conversion, and transformation result is input to cpu load identification control module and calculates newly-increased load parameter, and judge according to the character of newly-increased load parameter to newly-increased load, undertaken performing and controlling by cpu load identification control module again, and be interconnected transmission with communication module, described cpu load identification control module is connected with relay control module, relay control module connects output socket.
4. electricity consumption load management intelligent terminal as claimed in claim 1, it is characterized in that: after described external power source interface connects current sensor, voltage sensor, directly give electric energy metering module and carry out power measurement, the signal that described current sensor and voltage sensor export also separates a road simultaneously and delivers to A/D modular converter and carry out analog-to-digital conversion; Described current sensor separates a road signal again and frequency-selecting harmonic wave separation module is carried out frequency-selecting and isolates harmonic wave, and isolated harmonic signal is given A/D modular converter after amplifying and carried out analog-to-digital conversion; Transformation result is given the parameter that cpu load identification control module calculates newly-increased electric loading, and judge according to the character of parameter to newly-increased electric loading of newly-increased load, according to judging that cpu load identification control module can perform and control, and be interconnected transmission with communication module, described cpu load identification control module is connected with relay control module, and relay control module connects output socket.
5. electricity consumption load management intelligent terminal as claimed in claim 1, is characterized in that: can return to electric energy metering module when the parameter that described cpu load identification control module calculates newly-increased electric loading is wrong and carry out power measurement.
6. electricity consumption load management intelligent terminal as claimed in claim 1, it is characterized in that: described relay control module is provided with multiple, its corresponding output socket is provided with multiple, and one of them relay control module described is connected with corresponding output socket, then connects terminal power consumption equipment.
7. a system built by electricity consumption load management intelligent terminal, comprises server, communication network, multiple terminal power consumption equipment; It is characterized in that: this system also comprises multiple electricity consumption load management intelligent terminal, multiple concentrator and internal system transmission connect, the transmission of described internal system connects and comprises server connecting by communication network and multiple concentrator, described multiple concentrator is connected with multiple electricity consumption load management intelligent terminal by communication network, and described multiple electricity consumption load management intelligent terminal is connected with multiple terminal power consumption equipment.
8. system built by electricity consumption load management intelligent terminal as claimed in claim 7, it is characterized in that: described communication network comprise power carrier, wireless, 485, Ethernet, CAN multiple communication modes.
9. electricity consumption load management intelligent terminal system as claimed in claim 7, it is characterized in that: described server and the communication link between concentrator are that Ethernet connects, the connection of described concentrator and multiple terminal power consumption equipment be power carrier, wireless, 485, CAN communication link.
10. system built by electricity consumption load management intelligent terminal as claimed in claim 7, it is characterized in that: described electricity consumption load management intelligent terminal identifies multiple terminal power consumption equipment, condition monitoring, judgement, control, and corresponding data are transferred to concentrator by communication network, by concentrator, data are put on communication network, are transferred to server through communication network and carry out data operation, analysis, judgement and storage.
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| CN107340443A (en) * | 2017-07-20 | 2017-11-10 | 云南电网有限责任公司电力科学研究院 | A kind of method, apparatus and system of Intelligent Recognition electric loading |
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| CN111371096A (en) * | 2020-03-13 | 2020-07-03 | 民广电气科技有限公司 | Active filtering power transmission method |
| CN111833521A (en) * | 2019-04-15 | 2020-10-27 | 浙江智充电力科技有限公司 | Movable display sales cabinet with power supply |
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| CN115441452A (en) * | 2022-09-22 | 2022-12-06 | 费莱(浙江)科技有限公司 | Dynamic compensation method and system based on harmonic separation detection |
| CN115879037A (en) * | 2023-02-23 | 2023-03-31 | 深圳合众致达科技有限公司 | Student apartment load identification method and system based on intelligent electric meter |
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