CN104023370A - Cooperative transmission method based on game theory in smart power grid - Google Patents

Cooperative transmission method based on game theory in smart power grid Download PDF

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Publication number
CN104023370A
CN104023370A CN201410261118.XA CN201410261118A CN104023370A CN 104023370 A CN104023370 A CN 104023370A CN 201410261118 A CN201410261118 A CN 201410261118A CN 104023370 A CN104023370 A CN 104023370A
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community
data
transmission
dau
intelligent grid
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刘南杰
崔正杰
赵海涛
李大鹏
吴军民
张刚
黄在朝
黄辉
喻强
于海
张增华
邓辉
吴鹏
王向群
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanghai Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanghai Electric Power Co Ltd
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Publication of CN104023370A publication Critical patent/CN104023370A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention provides a cooperative transmission method based on a game theory in a smart power grid. The cooperative transmission method comprises the following steps of (1) constructing a smart power grid model; (2) establishing a relay transmission network model; (3) evaluating power demand and cost; (4) carrying out cooperative transmission on data of an ammeter. According to the cooperative transmission method, the cooperative transmission is carried out by utilizing a relay station, so that the speed and the reliability of data transmission of the smart power grid can be improved, the network performance is improved, and data congestion and packet loss are avoided. Meanwhile, in comparison with transmission through a public network, the information safety of the cooperative transmission is higher. A Nash equilibrium result is taken as a best transmission strategy of the relay station, the scientific scheduling in the aspect of power transmission and distribution is implemented, the total cost of a community is lowest, and the maximum benefit is obtained.

Description

In a kind of intelligent grid based on game theoretic cooperation transmission method
Technical field
The present invention relates to a kind of wireless communication technology, specifically relate in a kind of intelligent grid based on game theoretic cooperation transmission method.
Background technology
Intelligent grid has adopted multiple wireless technology at present, as the public network such as GPRS, CDMA and WiMAX technology.As mobile wireless network, GPRS/CDMA/TD etc. will become mobile communication carrier main in following Internet of Things, because of its feature that has without wiring, easily arranges, works under can mobility status, needing Mobile Transmission data and be unfavorable for the field occasion of arranging net being widely applied.WiMAX technology can provide the network service of wide area covering and safety high speed, and can support some communicating requirements that intelligent grid is current and following.
But wireless public network communication mode is owing to relying on public network operator, its fail safe, reliability, real-time can not ensure, there is certain time delay, and limited bandwidth, in the time that access user number increases, traffic rate is influenced serious, so general wireless public network is used for doing the not high and little occasion of data volume of requirement of real-time.WiMAX rational covering radius in urban district is approximately only several kilometers, and active data transmission rate can increase and reduce along with the distance between user and base station.That is to say, the user who is in covering edge, community is difficult to the high data transfer rates that ensures that it is claimed.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes in a kind of intelligent grid based on game theoretic cooperation transmission method.Consider the best cooperation transmission of ammeter data in intelligent grid.Because signal is subject to the impact etc. of landform, landforms in the process of transmission, in actual system (as WiMAX), data transmission quality is undesirable, the serious area of some signal fadeout just there will be covering cavity, or the signal of footprint edges is very weak, user cannot be communicated by letter, or cause loss of data.Passing through in the present invention disposed cell relays station and comes for data aggregate unit (DAU, data aggregator unit) execution relay transmission, improve the transmission rate of data aggregate unit (DAU), avoid by relay transmission that DAU's is congested, propose a non-cooperative game model and analyze transmission policy (relay station is carried out the probability of transmission), and use the preferred plan (according to cost minimization principle) of Nash Equilibrium as community's relay transmission.
The object of the invention is to adopt following technical proposals to realize:
In a kind of intelligent grid, based on game theoretic cooperation transmission method, its improvements are, described method comprises
(1) build intelligent grid model;
(2) set up the network model of relay transmission;
(3) assessment electricity needs and cost;
(4) ammeter data cooperation transmission.
Preferably, described intelligent grid model comprises HAN HAN, neighborhood net NAN and wide area network WAN.
Further, intelligent appliance, control appliance and the intelligent electric meter in described each family uses short distance or local area radio transmission to be linked to be a HAN HAN, and is connected with neighborhood net by home gateway; A neighborhood net of some HAN compositions of Yi Ge community; HAN HAN gateway is transferred to polymerized unit DAU by neighborhood net NAN by instrumented data; Wide area network is for connecting remote system at intelligent grid.
Further, described polymerized unit DAU transmits data as NAN gateway to MDMS.
Preferably, described step (2) is included in community and sets up relay station, DAU sends ammeter data bag to MDMS, relay station is also received the data that DAU sends, the packet that relay station receives from data aggregate cells D AU is decoded, and wide area network WAN is sent to MDMS decoded data packets from data aggregator DAU.
Preferably, described step (3) comprises that the set of the probability density function of electricity needs is
C pow ( L ) = P f E ~ ( L ) + ∫ E min E max P o max ( 0 , z - E ~ ( L ) ) f ( z ) d z - - - ( 1 )
Wherein, E minand E maxrespectively minimum and maximum energy requirement; for the reserved electric weight cost of unit commit phase; for in the Ji scheduling phase extra electricity charge.
Preferably, described step (4) comprises
If the community of player in coverage, total players number is M; The tactful x of the m of community mfor packet carries out the probability of relay transmission from DAU to MDMS; Community's m total cost is defined as follows:
C m tot ( x m , X - m ) = C m pow ( L ( x m , X - m ) ) + C m rel x m - - - ( 2 )
Wherein, X -mit is the policy space of being carried out the probability of relay transmission by the relay station of other communities except the m of community;
the electricity charge of the m of community obtaining according to formula (1) when only considering the node in the m of community;
it is the cost of relay transmission;
L (x m, X -m) be according to the defined data packet loss of the probability of relay transmission
Data packet loss can obtain by following formula:
L ( x m , X - m ) = Σ m = 1 M N m - R ( x 1 , · · · , x M ) Σ m = 1 M N m - - - ( 3 )
Wherein, for the packet sum generating within the estimation cycle, arrive the ammeter data of DAU; R (x 1..., x m) while being the relay transmission probability of given community, the average transmission rate of DAU within each estimation cycle;
Adopt the non-cooperative game model of Nash Equilibrium as relay transmission, the optimal response strategy of the m of community calculates according to following formula: x m * = min x m C m tot ( x m , X - m ) ;
When C m tot ( x m * , X - m * ) ≤ C m tot ( x m , X - m * ) ∀ m ∈ M Time, Nash Equilibrium is defined as , Nash Equilibrium is in All Policies, to make of cost taken by themselves minimum;
Wherein, it is the policy space of the optimal response strategy of other communities beyond the m of community.
Compared with the prior art, beneficial effect of the present invention is:
The relay station that utilizes that the present invention proposes carries out cooperation transmission, can improve speed and the reliability of intelligent grid transfer of data, improves network performance, avoids data congestion and packet loss.With respect to utilizing public network transmission, its Information Security is higher simultaneously.
Utilize Nash Equilibrium result as relay station best transmission strategy, realize the science scheduling of power transmission and distribution aspect, the lowest cost that can Shi Ge community, obtains maximum benefit.
Brief description of the drawings
Fig. 1 is based on game theoretic cooperation transmission method schematic diagram in a kind of intelligent grid provided by the invention.
Fig. 2 is based on game theoretic data communication and wireless network model schematic diagram in a kind of intelligent grid provided by the invention.
Fig. 3 is the cooperation transmission model schematic diagram based on ammeter data in game theoretic cooperation transmission method in a kind of intelligent grid provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention is based on the broadcast characteristic that has been introduced in by utilizing wireless channel of the multifarious cooperation transmission of cooperation and improve performance (being reliability and throughput).A signal that sends to destination also can be received by near other nodes source, and such node can be used as repeater, carrys out repetition transmitting procedure, and making to accept the copies of information that multiple independently source nodes and repeater send becomes possibility.Wireless technology can be used to the different piece of intelligent grid, realizes flexibly and data communication cheaply and networking.But, because radio spectrum resources is limited, only have by sophistication and obtain maximum efficiency.The present invention proposes to apply cooperation transmission in the wireless network of intelligent grid.Consider the best cooperation transmission of ammeter data in intelligent grid, to improve speed and the reliability of transfer of data in intelligent grid.
First propose a kind of applicable data communication and wireless network architecture, under this network system, utilize intelligent electric meter to collect user data, and send to control data corporation.For fear of Data Collection and transmission in congested, the present invention propose in wireless network, apply cooperation transmission, set up community's relay station to carry out the relay transmission of data.Non-cooperative game model is finally proposed, to analyze the best cooperation transmission strategy (transmission cost is minimum) of trying to achieve relay transmission.
1, data communication and wireless network in the intelligent grid that the present invention proposes
As shown in Figure 1, can support data transmission and the energy conservation in intelligent grid with different wireless network architectures.Three kinds of different scales that use in intelligent grid and the main network of position, respectively: HAN (HAN, Home area network), neighborhood net (NAN, Neighborhood area network), and wide area network (WAN, Wide area network).Intelligent appliance, control appliance and intelligent electric meter in each family uses short distance or local area radio transmission (for example WiFi and ZigBee) to be linked to be a HAN HAN, and is connected with neighborhood net by home gateway.A neighborhood net of some HAN compositions of Yi Ge community.HAN HAN gateway is transferred to DAU by neighborhood net NAN by instrumented data.When the exchanging of DAU and HAN gateway by network technology as WiFi.In addition, DAU can be used as NAN gateway and transmits data to MDMS.Wide area network is for example, for connect remote system (, MDMS, AMI, SONET) in intelligent grid.Wide area network gateway can use broadband connection (for example, 3G, satellite, WiMAX) to collect required data.Relay transmission in the present invention is carried out within the scope of wide area network, for the process of the transmission data from DAU to MDMS.
2, the network model of relay transmission
In the intelligent grid model of proposing, ammeter data (being power consumption and need state) is to collect from household electrical appliance by intelligent electric meter.Service area is divided into M community, and each community corresponds to a group house.N mrepresent node (user) number of the m of community.The electricity consumption data that collect intelligent electric meter by NAN (being single-hop or multi-hop WIFI) all communities send to data aggregate cells D AU.Then DAU issues MDMS ammeter data by WAN (as WIMAX).MDMS carries out estimated demand to all communities, and the demand total data obtaining according to estimation is formulated generating contracted quantity to Power Generation, and distributes amount of power supply to user area.In order to improve reliability and speed, it is that DAU carries out cooperation transmission that each community investment disposes a relay station, with the performance of wide area network (WAN) link between improving from DAU to MDMS.Therefore, can avoid DAU to collect congested when ammeter data from great deal of nodes.Accompanying drawing 2 has shown the example of a network model that comprises 3 communities as above, wherein, and RS mrepresent the relay station of the m of community.Obviously, relay station can be placed on the diverse location (such as between DAU and MDMS) of community, the transmission performance of DAU while using relay transmission to improve.
Consider the double bounce cooperation transmission from DAU to MDMS (can use the frame structure in IEEE802.16j and 802.16m).Community's relay station adopts decoding to forward the trunking method of (DF), supposes that each relay station and DAU are on same frequency channels that is:.First the packet that, DAU sends ammeter data is to MDMS.Meanwhile, the data that the relay station of all communities also can uppick DAU sends.If a relay station determines to carry out relay transmission (strategy of having selected according to community), it will be decoded to the packet receiving from data aggregate cells D AU.Then relay station decoded data packets from being sent to from data aggregator DAU MDMS (ammeter data management system).If c is current relay station, represent the transmission speed of relay station c with r (c).Known channel quality, can obtain transmission rate r (c) by the spectrum efficiency of calculating the multiple relay stations under Adaptive Modulation.
3, electricity needs and assessment of cost
Due to uncertain (as random electricity needs), in general, the Operation Decision of an electric power system in two stages.First stage, electric company subscribes electric weight according to the load of expection from power plant.This one-phase is called as unit promises to undertake, before practical operation, signs a contract.Second stage is called economic dispatch, runs into after actual demand, and predetermined electric weight is offered to user.But, if the electric weight of subscribing (not subscribing so much) not will be bought extra electric power from possible power plant.Because be to determine in advance in the agreement (electric weight of being subscribed) of unit commit phase, electric company can select with purchasing price ratio at the cheap electricity of economic dispatch stage.Previous stage price P frepresent, use P for latter one orepresent.By two decision phases, electric company can be effectively in the supply of electric power of uncertain situation dispatching to consumer.
The ammeter data that first MDMS transmits according to DAU is estimated the electricity needs of all nodes in all communities.This estimation is carried out in cycle estimator.Then, according to the power demand of estimating, the electric power storage level of the MDMS unit's of decision commit phase before the electricity consumption cycle and the additional power supply of buying in economic dispatch stage.
Estimate for electricity needs, the sample (being electricity needs information) that sends an electric quantity consumption by DAU at each node of a coverage of estimation stages is to MDMS.All samples data are aggregated, and during electricity consumption, the electricity needs total amount of coverage is calculated by MDMS.The average electricity needs P of node n in the m of community m, nrepresent.If transfer of data does not have packet loss (not having congested) between DAU and MDMS, the electricity needs total amount of estimation is used E = D + α = Σ m = 1 M Σ n = 1 N m P m , n + α Represent, wherein D = Σ m = 1 M Σ n = 1 N m P m , n Be to add up according to ammeter data the power consumption of estimating, α is the electric weight demand causing due to uncertainty event.For example, in summer, according to weather forecast, if second day temperature raises, may cause idle call electric weight to increase, on the basis of statistical forecast, add certain extra need for electricity α, otherwise, on the basis of statistical forecast, deduct α, α can be just also can be negative.Other social factors, as live in a certain TV programme, festivals or holidays etc. also can exert an influence to α.But if having congested in DAU and represent packet loss (such as owing to lacking buffer space) with L, total energy requirement is estimated as it is identical and independently that the data-bag lost probability of all nodes is thought.In this case, because MDMS lacks complete data, packet loss causes lower energy requirement to be estimated.For electricity needs z, actual energy requirement is random, represents power density function (PDF) with f (z).(such as because possible DAU packet loss L) electricity charge under needs estimate error can obtain from following formula:
C pow ( L ) = P f E ~ ( L ) + ∫ E min E max P o max ( 0 , z - E ~ ( L ) ) f ( z ) d z - - - ( 1 )
E minand E maxrespectively minimum and maximum energy requirement.In the time having demand evaluated error, as shown in Equation 1, (it spent by the reserved electric weight in unit commit phase in the definition of the electricity charge ) and the extra electricity charge of Ji scheduling phase ( ) composition, the extra electric weight of scheduling phase that wherein helps has optional price, in the time that the reserved electric weight supply of unit commit phase could not enough satisfy the demands, just there will be this part electricity charge.It should be noted that, in order to simplify the calculating of the electricity charge, power requirement can be separated into a limited set, in this set, the set of the probability density function of the electricity needs in formula (1), can replace by the summation of approximate probability mass function (PMF).
4, the best cooperation transmission of ammeter data transmission
Because the community in intelligent grid in coverage can rationality the cost minimization that makes them, so they can carry out relay transmission by the diplomatic DUA of being.For example: consider the scene shown in accompanying drawing 2, the relay station of community 1 is that DAU carries out relay transmission.Therefore, due to higher transfer rate, the packet loss of DAU will be reduced, and this will produce less needs estimate error and the electricity charge still less (, in unit commit phase by reserved enough supplies of electric power).In this case, community 2 and 3 also benefits from the relay transmission of community's 1 relay station, but need not pay any expense.Because community 1 has recognized this situation, so even if relay transmission can reduce his electricity charge, it may can not be also DAU execution relay transmission always.In this case, because community 2 and 3 is rationality, they are necessary for DUA and carry out relay transmission and reduce the electricity charge.Therefore,, concerning all communities, it is very important finding a balance policy for DUA execution relay transmission, to reach their cost minimization separately.
In a coverage of intelligent grid, according to noncooperative situation between above-mentioned community, non-cooperative game model can be formulated as follows: player is the community in coverage, and total players number is M.The tactful x of the m of community mfrom DAU to MDMS, carry out exactly the probability of relay transmission for packet.Player's target is to minimize total cost.Community's m total cost is defined as follows:
C m tot ( x m , X - m ) = C m pow ( L ( x m , X - m ) ) + C m rel x m - - - ( 2 )
Wherein X -mit is the policy space of being carried out the probability of relay transmission by the relay station of other all communities except the m of community. the electricity charge of the m of community obtaining according to formula (1) while being the node of only considering in the m of community. it is the cost (for example, because the bandwidth of electric energy consumption and relay station is used) of relay transmission.L (x m, X -m) represent according to the defined data packet loss of the probability of relay transmission.Packet loss can obtain by following formula:
L ( x m , X - m ) = Σ m = 1 M N m - R ( x 1 , · · · , x M ) Σ m = 1 M N m - - - ( 3 )
Wherein, be illustrated in the packet sum generating in the estimation cycle, arrive the ammeter data of DAU.R (x 1..., x m) while being the relay transmission probability of given all communities, the average transmission rate of DAU within each estimation cycle.
The coverage of the Ge Duo community in intelligent grid, considers the non-cooperative game model solution of Nash Equilibrium as relay transmission.First, the optimal response strategy of the m of community is according to drawing as follows: then work as C m tot ( x m * , X - m * ) ≤ C m tot ( x m , X - m * ) ∀ m ∈ M Time, Nash Equilibrium is defined as that is, Nash Equilibrium is in All Policies, to be of cost taken by themselves minimum, according to following acquisition: wherein, it is the policy space of the optimal response strategy of other all communities beyond the m of community.In Nash Equilibrium, if other communities keep their relaying strategy constant, do not have so community to reduce the defined single total cost of equation 2 by changing relay transmission probability.Numerical method (such as pure algorithm) can be for obtaining optimal response strategy and Nash Equilibrium subsequently.
Known by analyzing, in intelligent grid, the relay station of multiple communities can be carried out relay transmission and improves DAU performance, and this will bring lower total cost; Relay station can tactic the probability of adjustment relay transmission obtain minimum cost.There are many Nash Equilibrium points in this model, we can search for along Nash Equilibrium at suppose relay station, and to select can be the scheme of all relay stations generation least costs, i.e. balanced selection can be for obtaining best solution.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify or be equal to replacement the specific embodiment of the present invention with reference to above-described embodiment; these do not depart from any amendment of spirit and scope of the invention or are equal to replacement, within the claim protection range of the present invention all awaiting the reply in application.

Claims (7)

  1. In intelligent grid based on a game theoretic cooperation transmission method, it is characterized in that, described method comprises
    (1) build intelligent grid model;
    (2) set up the network model of relay transmission;
    (3) assessment electricity needs and cost;
    (4) ammeter data cooperation transmission.
  2. In a kind of intelligent grid as claimed in claim 1 based on game theoretic cooperation transmission method, it is characterized in that, described intelligent grid model comprises HAN HAN, neighborhood net NAN and wide area network WAN.
  3. In a kind of intelligent grid as claimed in claim 2 based on game theoretic cooperation transmission method, it is characterized in that, intelligent appliance, control appliance and intelligent electric meter in described each family uses short distance or local area radio transmission to be linked to be a HAN HAN, and is connected with neighborhood net by home gateway; A neighborhood net of some HAN compositions of Yi Ge community; HAN HAN gateway is transferred to polymerized unit DAU by neighborhood net NAN by instrumented data; Wide area network is for connecting remote system at intelligent grid.
  4. In a kind of intelligent grid as claimed in claim 3 based on game theoretic cooperation transmission method, it is characterized in that, described polymerized unit DAU transmits data as NAN gateway to MDMS.
  5. In a kind of intelligent grid as claimed in claim 1 based on game theoretic cooperation transmission method, it is characterized in that, described step (2) is included in community and sets up relay station, DAU sends ammeter data bag to MDMS, relay station is also received the data that DAU sends, the packet that relay station receives from data aggregate cells D AU is decoded, and wide area network WAN is sent to MDMS decoded data packets from data aggregator DAU.
  6. In a kind of intelligent grid as claimed in claim 1 based on game theoretic cooperation transmission method, it is characterized in that, described step (3) comprises that the set of the probability density function of electricity needs is
    C pow ( L ) = P f E ~ ( L ) + ∫ E min E max P o max ( 0 , z - E ~ ( L ) ) f ( z ) d z - - - ( 1 )
    Wherein, E minand E maxrespectively minimum and maximum energy requirement; for the reserved electric weight cost of unit commit phase; for in the Ji scheduling phase extra electricity charge.
  7. In a kind of intelligent grid as claimed in claim 1 based on game theoretic cooperation transmission method, it is characterized in that, described step (4) comprises
    If the community of player in coverage, total players number is M; The tactful x of the m of community mfor packet carries out the probability of relay transmission from DAU to MDMS; Community's m total cost is defined as follows:
    C m tot ( x m , X - m ) = C m pow ( L ( x m , X - m ) ) + C m rel x m - - - ( 2 )
    Wherein, X -mit is the policy space of being carried out the probability of relay transmission by the relay station of other communities except the m of community
    the electricity charge of the m of community obtaining according to formula (1) when only considering the node in the m of community;
    it is the cost of relay transmission;
    L (x m, X -m) be according to the defined data packet loss of the probability of relay transmission;
    Data packet loss can obtain by following formula:
    L ( x m , X - m ) = Σ m = 1 M N m - R ( x 1 , · · · , x M ) Σ m = 1 M N m - - - ( 3 )
    Wherein, for the packet sum generating within the estimation cycle, arrive the ammeter data of DAU; R (x 1..., x m) while being the relay transmission probability of given community, the average transmission rate of DAU within each estimation cycle;
    Adopt the non-cooperative game model of Nash Equilibrium as relay transmission, the optimal response strategy of the m of community calculates according to following formula: x m * = min x m C m tot ( x m , X - m ) ;
    When C m tot ( x m * , X - m * ) ≤ C m tot ( x m , X - m * ) ∀ m ∈ M Time, Nash Equilibrium is defined as , Nash Equilibrium is in All Policies, to make of cost taken by themselves minimum;
    Wherein, it is the policy space of the optimal response strategy of other communities beyond the m of community.
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CN104767763A (en) * 2015-04-28 2015-07-08 湖北工业大学 Privacy protecting area user electricity quantity aggregation system and method for intelligent power grid
CN104767763B (en) * 2015-04-28 2017-10-24 湖北工业大学 The zone user electricity paradigmatic system and method for secret protection in a kind of intelligent grid
CN104994505A (en) * 2015-07-11 2015-10-21 中国能源建设集团广东省电力设计研究院有限公司 Wireless malicious behavior predicting and coping method and data security acquisition system oriented to smart grid
CN104994505B (en) * 2015-07-11 2023-04-07 中国能源建设集团广东省电力设计研究院有限公司 Wireless malicious behavior prediction and coping method for smart grid and data security acquisition system
WO2019000851A1 (en) * 2017-06-30 2019-01-03 华南理工大学 Game theory-based relay selection and power distribution method in smart power grid
CN113612853A (en) * 2021-08-16 2021-11-05 燕山大学 Network resource scheduling method combining edge calculation
CN115529324A (en) * 2022-08-16 2022-12-27 无锡市恒通电器有限公司 Data forwarding method of intelligent Internet of things ammeter in Internet of things communication scene
CN115529324B (en) * 2022-08-16 2023-12-15 无锡市恒通电器有限公司 Data forwarding method of intelligent Internet of things ammeter in Internet of things communication scene

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