CN105763611A - Smart grid communication method - Google Patents
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- CN105763611A CN105763611A CN201610098509.3A CN201610098509A CN105763611A CN 105763611 A CN105763611 A CN 105763611A CN 201610098509 A CN201610098509 A CN 201610098509A CN 105763611 A CN105763611 A CN 105763611A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Abstract
The invention discloses a smart grid communication method comprising a top control center layer, a middle grid management layer and a bottom grid element layer. The grid center communicates with a distribution network and at least one grid element via the Ethernet. An in-station local area network is arranged in the grid management layer to realize communication between in-station equipment of the grid management layer. The in-station equipment includes a database server, a server, a workstation, a communication server, and a communication front machine. The in-station local area network communicates with the control center layer via the Ethernet. The method is compatible with grid elements with different communication interfaces through the communication front machine, and signal adjustment and correction is carried out at both the transmitter end and the receiver end of the grid to ensure high-accuracy signal transmission.
Description
Technical field
The invention belongs to electric network data communication field, be specifically related to a kind of intelligent grid means of communication.
Background technology
In recent years; the clean reproducible energy generation technologies such as solar energy, wind energy, biomass energy are mature on the whole; adopt distributed generation technology can improve generating efficiency and power supply reliability; green electric power supply can be provided a user with by treatment in accordance with local conditions; realize, user side " generate electricity nearby and use nearby ", promoting that its scale is applied.
Grid control system is the core of electrical network, and the running status of whole network system is monitored by it, and according to system control strategy electrical network composed component is controlled and manages.
After simulation blind controller system, centralized numerical control system, dcs, distributed measurement and control system based on various standard for Fieldbus are widely used.But the control bus network that system adopts is varied, and various bus standards have the protocol format oneself specified, incompatible each other, is unfavorable for the design of system, maintenance, extension.
Along with the development that China intelligent grid is built, become inevitable development trend based on the communication means of intelligent grid；The communication mode of various controller switching equipments continues to bring out, and mainly has fiber optic communication, distribution wire communication and radio communication.
Chinese invention patent " is used in particular for the point to point communication system of distribution system ", application publication number: 200980160612.4, and this patent document relates to a kind of communication sent by distribution network；Further relating to point to point communication system, by this point to point communication system, information can be easy to be transmitted in this network other place arbitrary from any one place this distribution network.In this patent, point to point link is transmitted by distribution wire, and transmission range need to cover distribution wire and can cover the area transmission of distribution wire.
Summary of the invention
Goal of the invention: the invention aims to solve deficiency of the prior art, a kind of requirement that can effectively meet grid control system complex communication is provided, there is intelligent grid data communication system and the data communication method thereof of higher reliability and extensibility.
Technical scheme: a kind of intelligent grid data communication system of the present invention, including:
Control centre's layer, it is positioned at the top layer of the communication system of this distributed power grid, described control centre layer includes for power distribution network management and runs the Grid Central controlled, described Grid Central and power distribution network and at least one electrical network unit carry out communication by Ethernet, are controlled by this Grid Central mode of operation to electrical network unit and operational factor according to the operational plan of economical operation Rulemaking realizing power distribution network；
Administration of power networks layer, it is positioned at the intermediate layer of the communication system of this distributed power grid, for according to by the production and living condition of electric unit, this is carried out administration by different levels with the load of electric unit, divide sensitive load and general load, each micro power being equipped with is managed simultaneously, the power supply capacity of micro power is carried out real-time estimate and assessment, to tackle the requirement on upper strata；Described administration of power networks layer arranges LAN in station, to realize the communication between administration of power networks layer station equipment, described station equipment includes database server, server, work station, communication server and communication front end processor, in described station, LAN carries out communication by Ethernet and control centre's layer, in described station, LAN is connected with electric unit net also by fire wall, with the productive life information of acquisition electric unit；
Electric network element layer, it is positioned at the bottom of the communication system of this distributed power grid, described electric network element layer is made up of multiple electric network elements, described electric network element is micro power or energy storage device or load equipment, described electric network element is directly connected to LAN in described station by ethernet communication interface, or it is connected with communication front end processor by communication network, to realize the communication between electric network element layer and administration of power networks layer；
The electric network element layer of administration of power networks layer and corresponding communication constitutes an electrical network unit；
Mutual communication is carried out by communication network between described administration of power networks layer and described electric network element layer, described communication network includes WIMAX signal issuing side, user terminal and electric lines of force, CPU, the first signal testing unit, secondary signal test cell, signal adjustment unit and signal correction unit, wherein, it is provided with the first reference signal of described first signal testing unit and secondary signal test cell comparison and the threshold values of comparison reference thereof in described CPU, and sends control instruction to described signal adjustment unit and signal correction unit；
Described first signal testing unit, it receives the demand signal of described WIMAX signal issuing side transmission and it is carried out sample detecting, its crest value choosing each cycle within N0 the cycle of continuous print is sampled point, interval time, T0 sampled once, choose M0 time, judge that the sampled peak information chosen is whether between the threshold values K0-K1 that described CPU pre-sets M0 time, comparison result is sent and processes to described CPU and signal adjustment unit；
Described signal adjustment unit, it accepts the control instruction of described CPU, described demand signal can not meet require time, the signal that described signal issuing side is sent sends to described signal issuing side after being adjusted；
Described secondary signal test cell, it receives the data signal on described electric lines of force, carry out sampling and detecting after reduction treatment, judge that sampled peak information is whether between threshold values K3～K4 that described CPU pre-sets, and comparison result is transmitted separately to described CPU and signal correction unit；
Described signal correction unit, it accepts the control instruction of described CPU, described demand signal can not meet require time, the demand signal being received from secondary signal processing unit is modified, it is at interval of N1 cycle, X sample point is chosen within the N1+1 cycle, choose M1 time continuously, and preset a threshold values K2 (K2 > 0), if the value of middle X-2 the sample point of arbitrary continuous print rising edge or trailing edge is at-K2～K2, then the value of group X-2 sample point of M1 is modified to the extreme value of demand signal waveform；
Wherein, signal correction unit includes a correcting module, correcting module includes beam splitter, converting unit, switch element and balance module, and optical signal is divided into two-way by wherein said beam splitter, is transferred to converting unit and switch element respectively, described converting unit converts optical signals to current signal or voltage signal, according to setting whether threshold decision luminous power transships and store optical power value, if power overload duration T, then to output feedback signal, adjusting output, switch element temporarily disconnects；If current signal or voltage signal are not reaching to set threshold value, then switch element Guan Bi, optical signal transmission is to balance module；
Described balance module includes a photoelectric conversion module, a filtration module, an amplification module and a judging module, the optical signal received is changed into the signal of telecommunication by wherein said photoelectric conversion module, signal of telecommunication module elimination after filtering interference signal, intensity through the needs that signal is amplified by amplification module, judging module is to signal equalization, according to judgement formula, the signal of telecommunication is made decisions, the interference produced in correcting signal transmitting procedure.
Further, in described station, LAN is unit list web frame, described unit list web frame includes a database server, server, communication server, at least one work station and at least one communication front end processor, and described database server, server, communication server, work station and communication front end processor are connected to LAN in described station.
Further, in described station, LAN is the double; two web frame of two-shipper, the double; two web frame of described two-shipper includes two database servers, two servers, two communication servers, at least one work station and at least one communication front end processor, and described database server, server, communication server, work station and communication front end processor are all connected respectively with double; two nets of LAN in described station.
Further, level and minute level when the communication time yardstick of described control centre layer and administration of power networks layer is respectively little, the communication time yardstick of described electric network element layer is second level or Millisecond.
Further, described judging module, according to judgement formula judgement, adjudicates formula:
In above-mentioned formula, uk is the average at WIMAX signal issuing side 1 input signal sequence xk, and yk is the sequence received in judging module, and σ 2 is the variance of noise, then the most possible sequence recovered can have above-mentioned formula to calculate.
Further, described first signal testing unit includes a signal acquisition module and one first and controls module, wherein, described signal acquisition module, obtaining described demand signal in order to reduce, it includes a coupling module, a detection module, a filtration module, a gain amplifier module and a signal transmission port；
Described first controls module, it includes one first processing unit, one first Postponement module and a first interface unit, described first processing unit, it obtains threshold values K0 and the K1 that described CPU is preset, and obtain peak value sampling information, and with reference to this threshold values K0 and K1, described demand signal is compared；
Described first comparison module, it receives the peak value sampling information of described first processing unit output, after postponing a time T1, sends to described first processing unit.
Further, described signal correction unit also includes one the 3rd processing unit, one the 3rd Postponement module and revises circuit, wherein, and described 3rd processing unit, in order to obtain the M1 group sample intelligence of the reception signal waveform in described secondary signal test cell, often group comprises X sample point；
Described 3rd Postponement module includes X-2 the delayer sequentially concatenated, and it is connected with the outfan of described 3rd processing unit respectively, exports after postponing a preset time T 2 after receiving described sample point；Being provided with X-2 comparator in described comparison module, each comparator is connected with each delayer respectively.
The invention also discloses a kind of intelligent grid means of communication, comprise the steps:
Step 1, communication server receive instruction, described instruction are reorganized according to the protocol format of corresponding electric network element, after forming data message, are forwarded to communication front end processor；
Described instruction is unpacked by step 2, communication front end processor by peeling off the internal agreement message content of described data message, and is issued to this corresponding electric network element；
After step 3, electric network element receive the instruction after unpacking, the operation reserve in conjunction with self is performed, and result feeds back to communication front end processor；
Step 4, communication front end processor by described result according to inter-protocol form framing, form feedback data message, and send to communication server, communication server automatically resolve this feedback data message according to the protocol format of corresponding electric network element, form the feedback data message after unpacking.
Further, described instruction manually or automatically two ways is initiated, wherein, when adopting manual, instruction is initiated by work station by member, is sent to communication server by internal agreement, described unpack after feedback data message notifying to work station, the finally person of feeding back to；When adopting automatic, the grid policies that instruction is issued according to Grid Central by server is formed, and by internal agreement transmission to communication server, described in unpack after feedback data message notifying to server.
Beneficial effect: the present invention is by the communication front end processor electric network element with compatible different communication interfaces, and carries out adjustment and the correction of signal respectively at the transmitting terminal of electrical network and receiving terminal, it is ensured that signal transmission has higher accuracy.
Accompanying drawing explanation
Fig. 1 is the communication system architectures schematic diagram of the present invention；
Fig. 2 is the communication network structural representation of the present invention.
Detailed description of the invention
As a complete unit, power grid control strategy has reciprocity control, master & slave control and hierarchical control three kinds.According to distributed power grid control strategy requirement, the present invention devises a kind of three layers control structure, and the time scale that each layer is controlled divides, and respectively each layer communication network is designed accordingly.As it is shown in figure 1, the communication system of distributed power grid initially with three-tier architecture be respectively positioned at control centre's layer of top, the administration of power networks layer of centrally located layer and be positioned at the electric network element layer of the bottom.
Control centre's layer is region (as prefecture-level) distributed power grid control centre, it is achieved in one's respective area, the operational monitoring of all electrical network substation systems and coordination control, and the operation of coordination and tradition bulk power grid.Control centre's layer is located at the ground of bulk power grid, center, county, carries out communication by fiber optic Ethernet and administration of power networks layer.Control centre's layer is to be controlled by Grid Central, acts primarily as power distribution network management and economical operation control action.This layer, except being connected with power distribution network, is also connected with one or more electrical networks.Electrical network according to economical operation rule, can formulate operational plan, controls mode of operation and the operational factor of electrical network.Often a few hours in cycle even longer, the time scale of therefore communication requires as hour level.Described control centre layer is generally apart from each other with administration of power networks layer, and the time scale of communication requires to be hour level, therefore can adopt the communication to realize between them of the 1000M fiber optic Ethernet.
Enterprise's load, firstly the need of the production and living condition according to enterprise, is carried out administration by different levels by administration of power networks layer, divides sensitive load and general load.Each micro power that administration of power networks layer also needs to being equipped with is managed, and the power supply capacity (exerting oneself) in micro-source is carried out real-time estimate and assessment, to tackle the requirement on upper strata.Therefore the time scale of communication requires as minute level.At administration of power networks layer, LAN in station is set, to realize the communication between administration of power networks equipment, these station equipments include: database server, server, work station etc., especially include the communication server with lower floor electric network element layer device talk and communication front end processor.This LAN is connected with enterprise network also by fire wall, to obtain enterprise's production information.This LAN can be unit list web frame, it is also possible to be the double; two web frame of two-shipper, to reach higher reliability.The double; two web frame of unit list net, two-shipper.Due to the multiformity of electric network element, determine the communication network multiformity between administration of power networks layer and electric network element layer.Both can be wire communication, it is also possible to be wireless telecommunications..
Electric network element layer had both included the micro powers (being called for short micro-source) such as wind-driven generator, solaode, gas electricity generator, fuel electric generator, biomass power generation, also include various energy storage device and load equipment, also include the management and control device (such as inverter, charging-discharging controller, intelligent electric meter etc.) of this equipment such as source, energy storage, load slightly.Time scale to these equipment states and the communication of operational factor is normally second level.When the catastrophic failure of electrical network, such as fault or the electrical network internal fault of electrical network, electrical network must disengage from electrical network, enters off-network operational mode.At this moment needing power grid control element quickly to respond, the time scale of therefore communication requires as Millisecond.
In order to tackle part electric network element Millisecond communication need, part electric network element, according to IEC61850 standard, is modeled, and adopts GOOSE to service, construct a rapid communication network by the present invention.GOOSE is a kind of rapid message transmission mechanism, and it instead of hard wired communication mode between equipment, enormously simplify the line of secondary cable.After the ASN.1 grammar compilation that GOOSE message is relevant to BER Basic Encoding Rules, without ICP/IP protocol, directly transmit on ethernet link layer, and adopt heartbeat message and displacement message quick repeats to combine mechanism, it have employed multiplex broadcasting association without confirmed service, skip transport layer and Internet, Millisecond can be reached.
Two DG are comprised at electric network element layer, respectively main DG and standby DG, they can set that (method of operation under isolated island mode provides when islet operation strong voltage and frequency to support principally for electrical network, and guarantees the following feature meeting load power into U/f.By initialization system reference voltage (U) and frequency (f), and detect inverter output end mouth voltage and frequency in real time, then pass through PI to regulate, realize constant voltage, constant frequency control), the P/Q (electrical network a kind of control mode under the state of being incorporated into the power networks, it controls purpose is the active power (P) making micro power export and reactive power (Q) real-time tracking device reference signal, each micro power is not involved in frequency and voltage-regulation, bulk power grid provide frequency and voltage support) two kinds of operational modes.Certainly, can also the main DG of only one of which in simple network system.Each DG operational mode is controlled by grid mode controller, and PCC point switchs also by mode controller control, and these equipment meet IEC61850 standard.In the embodiment of the present invention, it is shown that network system include a photovoltaic DG (distributedgeneration distributed power generation), wind-force DG, a storage batteries D G, a diesel-driven generator DG and associated loadings.In order to meet the needs that electrical network sensitive load is powered when electric network fault, setting storage batteries D G and control main DG as U/f, diesel engine DG is as standby DG.The communication process of system is described below in conjunction with distributed micro-capacitance sensor control strategy.
At electrical network under normal circumstances, electrical network and electrical network are incorporated into the power networks, and operational plan, according to economical operation rule, is formulated in center, sets the operational factor of electrical network.Administration of power networks layer monitors each electric network element running status and parameter in real time, all DG is all set as P/Q control, and controls the operation of each electric network element in real time.When grid mode monitoring control devices to electric network fault or electrical network internal fault, rapidly PCC (pointofcommoncoupling points of common connection) point is switched off, rapidly main DG is set as that U/f control is (if main DG breaks down, then standby DG is set as U/f control), disconnect other DG and general load, thered is provided voltage, frequency to support by main DG for whole electrical network, enter island operation state.After system normal operation, then other DG are incorporated into the power networks, and run general load input.After electric network fault or electrical network internal fault eliminate, the voltage of grid mode monitoring control devices operation of power networks, frequency parameter, as reached the condition that is incorporated into the power networks just by PCC point switch Guan Bi, enter the state that is incorporated into the power networks.
According to system communication network architecture feature, internal system communications protocol physical layer adopts ICP/IP protocol, and application layer message only includes heading and message body.Because TCP/IP communication has higher reliability, correctness and the integrity of extra check code and end code checking prediction message need not be increased.Heading comprises two important information, for originating process address and purpose process address.Originating process address indicates that the program process of this message source device, purpose process address then indicate that this message is sent to the program process of equipment.The device process receiving this message will judge whether to process according to the two information, how to process, how to respond.Message body is then the real electric network element communication packet forwarded.
Internal system communications protocol message has up back message and downbound request message two kinds, issues, performs and respond, for instruction, the communication flow that this agreement is described below, as shown in Figure 1.System has manually and automatically two ways, is manually initiated instruction by member by work station, is forwarded to communication server by internal agreement, then is forwarded to communication front end processor by communication server.Automatic then directly by server according to dispatching of power netwoks strategy, form instruction, be issued to communication server, then be forwarded to communication front end processor by communication server.Manually and automatically instruction forms corresponding electric network element communications protocol and is issued to electric network element after finally all being peeled off internal agreement message content by communication front end processor.After electric network element receives instruction, the operation reserve in conjunction with self is performed, and result feeds back to communication front end processor.Again sent to communication server according to after inter-protocol form framing by communication front end processor again, as manual command, then result informed to work station, finally feed back to operator；As for automatic command, then result informed to server.
Mutual communication is carried out by communication network between described administration of power networks layer and described electric network element layer, as shown in Figure 2, described communication network includes WIMAX signal issuing side, user terminal and electric lines of force, CPU, first signal testing unit, secondary signal test cell, signal adjustment unit and signal correction unit, wherein, the first reference signal of described first signal testing unit and secondary signal test cell comparison and the threshold values of comparison reference thereof it is provided with in described CPU, and send control instruction to described signal adjustment unit and signal correction unit；
Described first signal testing unit, it receives the demand signal of described WIMAX signal issuing side transmission and it is carried out sample detecting, its crest value choosing each cycle within N0 the cycle of continuous print is sampled point, interval time, T0 sampled once, choose M0 time, judge that the sampled peak information chosen is whether between the threshold values K0-K1 that described CPU pre-sets M0 time, comparison result is sent and processes to described CPU and signal adjustment unit；
Described signal adjustment unit, it accepts the control instruction of described CPU, described demand signal can not meet require time, the signal that described signal issuing side is sent sends to described signal issuing side after being adjusted；
Described secondary signal test cell, it receives the data signal on described electric lines of force, carry out sampling and detecting after reduction treatment, judge that sampled peak information is whether between threshold values K3～K4 that described CPU pre-sets, and comparison result is transmitted separately to described CPU and signal correction unit；
Described signal correction unit, it accepts the control instruction of described CPU, described demand signal can not meet require time, the demand signal being received from secondary signal processing unit is modified, it is at interval of N1 cycle, X sample point is chosen within the N1+1 cycle, choose M1 time continuously, and preset a threshold values K2 (K2 > 0), if the value of middle X-2 the sample point of arbitrary continuous print rising edge or trailing edge is at-K2～K2, then the value of group X-2 sample point of M1 is modified to the extreme value of demand signal waveform；
Wherein, signal correction unit includes a correcting module, correcting module includes beam splitter, converting unit, switch element and balance module, and optical signal is divided into two-way by wherein said beam splitter, is transferred to converting unit and switch element respectively, described converting unit converts optical signals to current signal or voltage signal, according to setting whether threshold decision luminous power transships and store optical power value, if power overload duration T, then to output feedback signal, adjusting output, switch element temporarily disconnects；If current signal or voltage signal are not reaching to set threshold value, then switch element Guan Bi, optical signal transmission is to balance module；
Described balance module includes a photoelectric conversion module, a filtration module, an amplification module and a judging module, the optical signal received is changed into the signal of telecommunication by wherein said photoelectric conversion module, signal of telecommunication module elimination after filtering interference signal, intensity through the needs that signal is amplified by amplification module, judging module is to signal equalization, according to judgement formula, the signal of telecommunication is made decisions, the interference produced in correcting signal transmitting procedure.
Further, in described station, LAN is unit list web frame, described unit list web frame includes a database server, server, communication server, at least one work station and at least one communication front end processor, and described database server, server, communication server, work station and communication front end processor are connected to LAN in described station.
Further, in described station, LAN is the double; two web frame of two-shipper, the double; two web frame of described two-shipper includes two database servers, two servers, two communication servers, at least one work station and at least one communication front end processor, and described database server, server, communication server, work station and communication front end processor are all connected respectively with double; two nets of LAN in described station.
Further, level and minute level when the communication time yardstick of described control centre layer and administration of power networks layer is respectively little, the communication time yardstick of described electric network element layer is second level or Millisecond.
Further, described judging module, according to judgement formula judgement, adjudicates formula:
In above-mentioned formula, uk is the average at WIMAX signal issuing side 1 input signal sequence xk, and yk is the sequence received in judging module, and σ 2 is the variance of noise, then the most possible sequence recovered can have above-mentioned formula to calculate.
Further, described first signal testing unit includes a signal acquisition module and one first and controls module, wherein, described signal acquisition module, obtaining described demand signal in order to reduce, it includes a coupling module, a detection module, a filtration module, a gain amplifier module and a signal transmission port；
Described first controls module, it includes one first processing unit, one first Postponement module and a first interface unit, described first processing unit, it obtains threshold values K0 and the K1 that described CPU is preset, and obtain peak value sampling information, and with reference to this threshold values K0 and K1, described demand signal is compared；
Described first comparison module, it receives the peak value sampling information of described first processing unit output, after postponing a time T1, sends to described first processing unit.
Further, described signal correction unit also includes one the 3rd processing unit, one the 3rd Postponement module and revises circuit, wherein, and described 3rd processing unit, in order to obtain the M1 group sample intelligence of the reception signal waveform in described secondary signal test cell, often group comprises X sample point；
Described 3rd Postponement module includes X-2 the delayer sequentially concatenated, and it is connected with the outfan of described 3rd processing unit respectively, exports after postponing a preset time T 2 after receiving described sample point；Being provided with X-2 comparator in described comparison module, each comparator is connected with each delayer respectively.
The invention also discloses a kind of intelligent grid means of communication, comprise the steps:
Step 1, communication server receive instruction, described instruction are reorganized according to the protocol format of corresponding electric network element, after forming data message, are forwarded to communication front end processor；
Described instruction is unpacked by step 2, communication front end processor by peeling off the internal agreement message content of described data message, and is issued to this corresponding electric network element；
After step 3, electric network element receive the instruction after unpacking, the operation reserve in conjunction with self is performed, and result feeds back to communication front end processor；
Step 4, communication front end processor by described result according to inter-protocol form framing, form feedback data message, and send to communication server, communication server automatically resolve this feedback data message according to the protocol format of corresponding electric network element, form the feedback data message after unpacking.
Further, described instruction manually or automatically two ways is initiated, wherein, when adopting manual, instruction is initiated by work station by member, is sent to communication server by internal agreement, described unpack after feedback data message notifying to work station, the finally person of feeding back to；When adopting automatic, the grid policies that instruction is issued according to Grid Central by server is formed, and by internal agreement transmission to communication server, described in unpack after feedback data message notifying to server.
Claims (2)
1. intelligent grid means of communication, it is characterised in that: comprise the steps:
Step 1, communication server receive instruction, described instruction are reorganized according to the protocol format of corresponding electric network element, after forming data message, are forwarded to communication front end processor；
Described instruction is unpacked by step 2, communication front end processor by peeling off the internal agreement message content of described data message, and is issued to this corresponding electric network element；
After step 3, electric network element receive the instruction after unpacking, the operation reserve in conjunction with self is performed, and result feeds back to communication front end processor；
Step 4, communication front end processor by described result according to inter-protocol form framing, form feedback data message, and send to communication server, communication server automatically resolve this feedback data message according to the protocol format of corresponding electric network element, form the feedback data message after unpacking.
2. a kind of intelligent grid means of communication according to claim 1, it is characterized in that: described instruction manually or automatically two ways is initiated, wherein, when adopting manual, instruction is initiated by work station by member, sent to communication server by internal agreement, described in unpack after feedback data message notifying to work station, the finally person of feeding back to；When adopting automatic, the grid policies that instruction is issued according to Grid Central by server is formed, and by internal agreement transmission to communication server, described in unpack after feedback data message notifying to server.
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| US20090088907A1 (en) * | 2007-10-01 | 2009-04-02 | Gridpoint, Inc. | Modular electrical grid interface device |
| CN103094985A (en) * | 2013-01-24 | 2013-05-08 | 成都宏天电传工程有限公司 | Intelligent grid system |
| CN104270413A (en) * | 2014-09-10 | 2015-01-07 | 中国科学院广州能源研究所 | Communication system and method for dispatching of distributed micro power grid |
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Application publication date: 20160713 |