CN202363902U - System for managing micro-grid energy - Google Patents
System for managing micro-grid energy Download PDFInfo
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- CN202363902U CN202363902U CN2011205335855U CN201120533585U CN202363902U CN 202363902 U CN202363902 U CN 202363902U CN 2011205335855 U CN2011205335855 U CN 2011205335855U CN 201120533585 U CN201120533585 U CN 201120533585U CN 202363902 U CN202363902 U CN 202363902U
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Abstract
本实用新型属于配电网调度及管理领域，提供了一种用于对微网能量进行管理的系统，智能电表采集微网系统各负荷的电量信息，智能终端接收所述智能电表采集的电量信息数据，并实时将所采集数据利用以太网进行输出，微网系统控制器接收所述智能终端输出的信息数据，对所述智能终端输出地数据信息数据进行整理，根据预先设定的微网控制策略进行逻辑判断，获得微网控制判据执行指令，并将控制指令传输到所述智能终端，实现了分布式电源优化控制、能量经济调度、可再生能源出力预测、无功优化和电压控制、需求侧响应、即插即用、并网和孤岛转换等应用功能，体现出智能电网坚强可靠、抵御攻击、经济性高的特点，具有重要的推广示范作用。
The utility model belongs to the field of distribution network dispatching and management, and provides a system for managing the energy of a microgrid. A smart meter collects the power information of each load in the microgrid system, and an intelligent terminal receives the power information collected by the smart meter. data, and use the Ethernet to output the collected data in real time, the micro-grid system controller receives the information data output by the smart terminal, organizes the data information data output by the smart terminal, and controls the data according to the preset micro-grid The strategy is logically judged, and the micro-grid control criterion execution instruction is obtained, and the control instruction is transmitted to the intelligent terminal, which realizes distributed power supply optimization control, energy economic dispatch, renewable energy output prediction, reactive power optimization and voltage control, Application functions such as demand-side response, plug-and-play, grid-connection, and island conversion reflect the characteristics of smart grids that are strong, reliable, resistant to attacks, and highly economical, and play an important role in popularization and demonstration.
Description
Technical field
The utility model belongs to power distribution network scheduling and management domain, relates in particular to a kind of system that the microgrid energy is managed of being used for.
Background technology
Distributed power source inserts after the distribution system, makes power distribution network singlely receive electric structure to become many power supply architectures from original, brings very big influence for the voltage fluctuation, harmonic wave, relaying protection etc. of electric power system.Distributed power source is a uncontrollable source as far as electrical network; The microgrid system will load and distributed power source is regarded an integral body as; In the outer net fault, forward the islet operation pattern to, improve power supply reliability, especially can be independently-powered when electrical network generation catastrophe failure to important load.
Present microgrid administrative skill does not realize that distributed power source optimal control, energy economy are dispatched, regenerative resource is exerted oneself functions such as prediction, Demand Side Response and plug and play, has seriously undermined environmental benefit and economic benefit that the microgrid system brings.
Summary of the invention
The utility model provides a kind of system that the microgrid energy is managed of being used for; Be intended to solve present microgrid administrative skill and do not realize the scheduling of distributed power source optimal control, energy economy, the regenerative resource functions such as prediction, Demand Side Response and plug and play of exerting oneself, seriously undermined the environmental benefit that the microgrid system brings and the problem of economic benefit.
The purpose of the utility model is to provide a kind of system that the microgrid energy is managed of being used for, and this system comprises:
Be used to gather the information about power that lighting load, important load, reactive power compensator, a small amount of living load, civil power are incorporated into the power networks, the intelligent electric meter that utilizes the Modbus rtu protocol that real time data is exported;
Be used for direct current is converted into the alternating current of microgrid system busbar, and the inverter that its job information data are exported;
Be used to receive job information data, bus service data and the secondary device protection information real-time data of the information about power data of said intelligent electric meter collection, the output of said inverter, and the intelligent terminal that utilizes Ethernet to export institute's image data in real time;
Be used to receive the information data of said intelligent terminal output; Said intelligent terminal output ground data message data are put in order; Carry out logic determines according to predefined microgrid control strategy; Obtain microgrid control criterion execution command, and control command is transferred to the microgrid system controller of said intelligent terminal;
Be used for keeping watch on the backstage microgrid EMS of the ruuning situation of whole microgrid system equipment according to the real time data that receives comprehensively.
Further, said system further comprises:
Be used to receive the control command of the microgrid system controller of said intelligent terminal output, control contactor, circuit breaker, secondary device protective device carry out the action Executive Module of corresponding actions.
Further, said intelligent electric meter comprises:
Be used to gather the lighting load intelligent electric meter of the information about power of lighting load;
Be used to gather the important load intelligent electric meter of the information about power of important load;
Be used to gather the reactive power compensation intelligent electric meter of the information about power of reactive power compensator;
Be used to gather a small amount of power intelligent electric meter of the information about power of a small amount of living load;
The civil power that is used to gather the information about power that civil power the is incorporated into the power networks intelligent electric meter that is incorporated into the power networks;
Be used to gather the energy storage intelligent electric meter of the information about power of batteries to store energy;
Be used to gather the photovoltaic intelligent electric meter of the information about power of photovoltaic generation;
Be used to gather the wind-force intelligent electric meter of the information about power of wind power generation.
Further, said inverter comprises:
Be used for the direct current of storage battery is converted into the energy storage combining inverter of the alternating current on the microgrid system busbar;
Be used for the direct current that photovoltaic produces is converted into the photovoltaic inversion device of the alternating current of microgrid system busbar;
Be used for the direct current that wind-force produces is converted into the wind power generation inverter of the alternating current of microgrid system busbar.
Further, said intelligent terminal further comprises:
Be used to receive the job information data of said energy storage combining inverter, photovoltaic inversion device and wind power generation inverter output, and first intelligent terminal that said job information data are exported;
Be used to receive the be incorporated into the power networks information about power data of intelligent electric meter output of said lighting load intelligent electric meter, important load intelligent electric meter, reactive power compensation intelligent electric meter, a small amount of power intelligent electric meter, civil power, and second intelligent terminal that said information about power data are exported;
Be used to receive the information about power data of said energy storage intelligent electric meter, photovoltaic intelligent electric meter, the output of wind-force intelligent electric meter, and the 3rd intelligent terminal that said information about power data are exported;
Further, said energy storage combining inverter employing can realize the accumulator cell charging and discharging management and have dynamic no-power compensation function bidirectional energy-storage inverter.
The utility model provides is used for system that the microgrid energy is managed; Intelligent electric meter is gathered information about power; Utilize RS485 bus Modbus rtu protocol that real time data is uploaded to intelligent terminal; Intelligent terminal is circle collection intelligent electric meter data, inverter data, bus operation, secondary device protection information real-time data etc. on the one hand, and utilize Ethernet to upload to the microgrid system controller institute's image data in real time, receive the microgrid control strategy command information that the microgrid system controller issues through the Ethernet ICP/IP protocol on the other hand; Resolve command information and obtain control command; Control constitutes the action Executive Module by contactor, circuit breaker, secondary device protective device and carries out corresponding actions, and the microgrid system controller receives each intelligent terminal that is connected on the one hand and uploads data, disposal data; And carry out logic determines according to predefined microgrid control strategy; After obtaining microgrid control criterion execution command, return control command and give corresponding intelligent terminal, make distributed power source and microgrid become the effective carrier that electrical network is admitted, utilized regenerative resource; Further promote the cascade utilization of the energy; Optimize energy resource structure, promote function and the effect of electrical network in the development low-carbon economy, realized distributed power source optimal control, energy economy scheduling, regenerative resource exert oneself prediction, idle work optimization and voltage control, Demand Side Response, plug and play, be incorporated into the power networks and application function such as isolated island conversion; Embody intelligent grid strong reliable, resist attack, characteristics that economy is high, have important popularization exemplary role.
Description of drawings
Fig. 1 is the structured flowchart of the system that the utility model embodiment being used for of providing the microgrid energy managed;
Fig. 2 is the flow chart of the method for the utility model embodiment being used for of providing the microgrid energy being managed;
Fig. 3 utilizes the utility model embodiment to carry out the flow chart of the implementation method of Charge Management.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further specified below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in the qualification invention.
The structure of the system that Fig. 1 shows that the utility model embodiment provides is used for the microgrid energy is managed.For the ease of explanation, only show the part relevant with the utility model.
This system comprises:
Intelligent electric meter 11 is used to gather the information about power that lighting load, important load, reactive power compensator, a small amount of living load, civil power are incorporated into the power networks, and utilizes RS485 bus Modbus rtu protocol that real time data is exported;
Backstage microgrid EMS 15 is used for keeping watch on according to the real time data that receives the ruuning situation of whole microgrid system equipment comprehensively, needs directly perceived, convenient, safe and reliable when satisfying the operations staff and operating.
In the utility model embodiment, this system further comprises:
Action Executive Module 16 is used to receive the control command of the microgrid system controller 14 of intelligent terminal 13 outputs, and control contactor, circuit breaker, secondary device protective device carry out corresponding actions.
In the utility model embodiment, intelligent electric meter 11 comprises:
Lighting load intelligent electric meter 111 is used to gather the information about power of lighting load;
Important load intelligent electric meter 112 is used to gather the information about power of important load;
Reactive power compensation intelligent electric meter 113 is used to gather the information about power of reactive power compensator;
A small amount of power intelligent electric meter 114 is used to gather the information about power of a small amount of living load;
The civil power intelligent electric meter 115 that is incorporated into the power networks is used to gather the information about power that civil power is incorporated into the power networks;
Energy storage intelligent electric meter 116 is used to gather the information about power of batteries to store energy;
Photovoltaic intelligent electric meter 117 is used to gather the information about power of photovoltaic generation;
Wind-force intelligent electric meter 118 is used to gather the information about power of wind power generation.
In the utility model embodiment, inverter 12 comprises:
Energy storage combining inverter 121 is used for converting the direct current of storage battery on the microgrid system busbar alternating current;
Photovoltaic inversion device 122 is used for the direct current that photovoltaic produces is converted into the alternating current of microgrid system busbar;
Wind power generation inverter 123 is used for the direct current that wind-force produces is converted into the alternating current of microgrid system busbar.
In the utility model embodiment, intelligent terminal 13 further comprises:
First intelligent terminal 131 is used to receive the job information data that energy storage combining inverter 121, photovoltaic inversion device 122 and wind power generation inverter 123 are exported, and the job information data is exported;
Second intelligent terminal 132; Be used to receive the be incorporated into the power networks information about power data of intelligent electric meter 115 outputs of lighting load intelligent electric meter 111, important load intelligent electric meter 112, reactive power compensation intelligent electric meter 113, a small amount of power intelligent electric meter 114, civil power, and the information about power data are exported;
The 3rd intelligent terminal 133 is used to receive the information about power data of energy storage intelligent electric meter 116, photovoltaic intelligent electric meter 117,118 outputs of wind-force intelligent electric meter, and the information about power data are exported;
In the utility model embodiment, 121 employings of energy storage combining inverter can realize the accumulator cell charging and discharging management and have dynamic no-power compensation function bidirectional energy-storage inverter.
The flow process of the method that Fig. 2 shows that the utility model embodiment provides is used for the microgrid energy is managed.This method may further comprise the steps:
In step S201, the information about power that intelligent electric meter 11 collection lighting loads, important load, reactive power compensator, a small amount of living load, civil power are incorporated into the power networks utilizes RS485 bus Modbus rtu protocol that real time data is exported;
In step S202, inverter 12 converts direct current the alternating current of microgrid system busbar into, and its job information data are exported;
In step S203; Intelligent terminal 13 receives the information about power data of intelligent electric meter 11 collections, job information data, bus service data and the secondary device protection information real-time data of inverter 12 outputs, and utilizes Ethernet to export institute's image data in real time;
In step S204; Microgrid system controller 14 receives the information data of intelligent terminal 13 outputs; Intelligent terminal 13 output ground data message data are put in order; Carry out logic determines according to predefined microgrid control strategy, obtain microgrid control criterion execution command, and control command is transferred to intelligent terminal 13;
In step S205, the ruuning situation that backstage microgrid EMS 15 is kept watch on whole microgrid system equipment according to the real time data that receives comprehensively, needs directly perceived, convenient, safe and reliable when satisfying the operations staff and operating.
In the utility model embodiment, this method further comprises:
In the utility model embodiment, the implementation method that 12 pairs of storage batterys of bidirectional energy-storage inverter are managed is:
When storage battery during to the electrical network feedback electric energy, regulate the active power of feedback, when battery voltage value was lower than perunit value 90%, battery stopped discharge;
When storage battery absorbs electric energy, through interface to the storage battery preliminary filling, fill soon, all fill, the voltage of floating charge controls.
As shown in Figure 3, in the utility model embodiment, the implementation method that 12 pairs of storage batterys of bidirectional energy-storage inverter carry out Charge Management is:
In step S301, charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T are set, and voltage U 1＜voltage U 2, voltage U 2＜voltage U 3;
In step S302, according to running situation to charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T is dynamically controlled and revise;
In step S303, when storage battery need not cause voltage to be lower than voltage U 1 for a long time, get into the preliminary filling stage, according to little electric current constant current charge;
In step S304, when battery tension is higher than voltage U 2 and is lower than voltage U 3, get into and fill the stage soon, according to big electric current constant current pressure limiting charging;
In step S305, when battery tension is higher than voltage U 3, gets into and all fill the stage, charge according to the constant voltage and current limiting mode;
In step S306, all filling the stage, when charging current is lower than electric current I, get into the floating charge stage, carry out constant current pressure limiting charging according to little electric current;
In step S307, when the floating charge process reached setting-up time T, storage battery was full of, and changed holding state over to.
Further describe below in conjunction with accompanying drawing and specific embodiment application principle the utility model.
The utility model provides is used for system that the microgrid energy is managed, and photovoltaic inversion device 122, wind power generation inverter 123, energy storage combining inverter 121 all have corresponding mode controller to realize control on the spot;
Intelligent electric meter 11 is gathered information about power, utilizes RS485 bus Modbus rtu protocol that real time data is uploaded to intelligent terminal 13;
The data that intelligent terminal 13 one side circle collection intelligent electric meters 11 are uploaded, the data of inverter 12 outputs, bus operation, secondary device protection information real-time data; And utilize Ethernet to upload to microgrid system controller 14 institute's image data in real time; Receive the microgrid control strategy command information that microgrid system controller 14 issues through the Ethernet ICP/IP protocol on the other hand; Resolve command information and obtain control command, control is connected constitutes action Executive Module 16 by contactor, circuit breaker, secondary device protective device etc. and carries out corresponding actions;
The microgrid control strategy through special algorithm realized the scheduling of distributed power source optimal control, energy economy, regenerative resource exert oneself prediction, idle work optimization and voltage control, Demand Side Response, plug and play, be incorporated into the power networks and application function such as isolated island conversion.On the other hand; Adopt Ethernet access server main frame, utilize ICP/IP protocol to upload the microgrid real time data and give server host, realize the real-time storage of microgrid significant data simultaneously; Can reserve the interface of communicating by letter simultaneously with data upload to electrical power distribution automatization system with dispatch automated system.Operator station is the main man-machine interface of microgrid system, according to the ruuning situation that the real time data of server host is kept watch on whole microgrid equipment comprehensively, and needs directly perceived, convenient, safe and reliable when satisfying the operations staff and operating.
Concrete implementation procedure is following:
1, control strategy and basic principle
(1) makes up complete microgrid energy technologies management method
I, microgrid energy technologies management method also realize carrying out communication with equipment such as all microgrid distributed power sources, energy storage, charging piles except having the ammeter information of collection, contactor being carried out the controlled function.
II, microgrid energy technologies management method have collection and show the function of the operation information of photo-voltaic power supply, energy storage, charging pile, like the current situation of exerting oneself, the running status of bidirectional energy-storage inverter 12;
III, microgrid energy technologies management method realize the situation of exerting oneself of distributed power source is control effectively.
(2) bidirectional energy-storage inverter
The bidirectional energy-storage inverter that adopts at present can be realized for the charging and discharging of accumulator management function: on the one hand when storage battery passes through the bidirectional energy-storage inverter to the electrical network feedback electric energy; Can regulate the active power of feedback; When battery voltage value is lower than perunit value 90%; Battery stops discharge, otherwise can cause irreversible damage to battery; On the other hand when storage battery absorbs electric energy through bidirectional energy-storage inverter 12, preliminary filling, fill soon, all fill, the voltage of floating charge can control through interface, thereby optimize the charging process of battery.
Bidirectional energy-storage inverter function is expanded, except that dual mode operated ability, also should be increased dynamic no-power compensation function, when being incorporated into the power networks, realize ADVANCED APPLICATIONS functions such as economical operation scheduling.
(3) the economical operation scheduling of various energy resources comprehensive utilization
The microgrid system comprises equipment such as photovoltaic battery panel, storage battery, charging pile and family expenses load.The electric power that microgrid provides to electrical network comes from clean energy resourcies such as wind-force, solar energy.Can reach the dual interests of economy and environment through rational energy conservation and comprehensive utilization.
2, distributed power source independence control strategy
(1) photovoltaic generation is independently controlled
Photovoltaic cell output VA characteristic curve is a nonlinear characteristic, and its output power curve also is non-linear.Working point when wherein electric current and voltage product are for maximum is a maximum power point.Load characteristic generally also is non-linear, and load should let load operation point and array maximum power working point be close when using as far as possible, and photovoltaic array is with Maximum Power Output like this.The maximum power of photovoltaic cell working point is departed from load or converter working point will reduce the photovoltaic cell delivery efficiency, waste cell panel capacity.
According to the basic principle of above photovoltaic generation, so no matter microgrid is the islet operation state, the state that still is incorporated into the power networks, photovoltaic generation is all handled as constant-power power source, does not participate in the middle of the work of regulating microgrid voltage and frequency.
(2) energy storage device discharges and recharges independent control
I, being incorporated into the power networks discharges and recharges strategy
A, the charging control of being incorporated into the power networks
Storage battery and net state under; Can charge by bus through two-way inverter; The charging process of storage battery is divided into four-stage: the phase I; When battery tension was lower than perunit value voltage 0.9, storage battery got into precharging state, and storage battery is taked the low current charge mode under this state; Second stage, storage battery get into fills the stage soon, and storage battery is taked constant current pressure limiting charging modes; Phase III, storage battery gets into and all fills the stage, and storage battery is taked constant voltage current-limiting charge mode; Stage.Storage battery gets into the floating charge mode, and storage battery is taked little electric current pressure limiting charging modes.
The voltage decision condition of the above four-stage of storage battery can be set according to the electrical network of reality, makes that storage battery grid-connected charging is more flexible, realizes the conversion of charge mode automatically, controls the optimal control that discharges and recharges that two-way inverter is realized energy storage device.
B, the discharge control of being incorporated into the power networks
Storage battery be in and net state under, take the control of permanent power, according to the Power Exchange of current microgrid and electrical network, determine the discharge control strategy of storage battery.Stabilize the frequency of microgrid and the fluctuation of voltage, but when battery tension is lower than perunit value 0.9, should stops to discharge, otherwise can cause irreversible damage battery.
II, discharge and recharge strategy from network operation
Battery is in from the network operation state, plays the effect of balance node, and voltage and frequency when having determined the piconet island operation are main purpose to satisfy load electricity consumption needs.
3, stabilize power fluctuation
According to load prediction, regulate the state that power that exerting oneself of photovoltaic generation, wind power generation and storage battery keep microgrid is in balance.On the one hand, and net state under, can be according to the exchange power of electrical network and microgrid, have at the distributed power source generated output under the situation of redundancy, unnecessary electric energy is fed back to electrical network; On the other hand,, can guarantee the long playing characteristics of microgrid, make microgrid long-play under good voltage and frequency in conjunction with quick adjustment and photovoltaic generation, the wind power generation of storage battery under net state.
4, economic dispatch
The microgrid system comprises equipment such as photovoltaic generation, energy storage, load.Microgrid is an electric energy with outside main energy sources exchanging form; Microgrid energy management technical method is through the uniform dispatching to various energy resources in the microgrid; Promptly can satisfy the demand of user to electric energy; Can realize the high-efficiency and economic operation of microgrid again, photovoltaic generation, energy storage, load are considered in system coordination, reach best using energy source and economy.
5, generating/load prediction
Microgrid energy management technical method realizes that generating and load prediction are the important foundations of system optimization control and economic dispatch, mainly comprises following a few partial content:
Volt generating prediction: according to natural situation Changing Pattern such as weather, temperature and running time section historical data, in conjunction with weather forecast photovoltaic generation short-term and ultrashort phase are exerted oneself and to predict.
(2) energy storage device load/generating prediction: be incorporated into the power networks and off-grid different working modes according to energy storage device,, discharge and recharge constraints, energy storage device load and generating are predicted in conjunction with energy storage device self through analyzing the energy-storage battery state-of-charge.
(3) charging electric vehicle machine load prediction: set and section running time according to the electric automobile charging and discharging state, combine charging electric vehicle machine optimization operation tactful, the charging electric vehicle machine is loaded predict.
(4) other household electrical appliances load predictions:, tame electric loading is predicted according to the history curve of household electricity.
6, consider the Demand Side Response of distributed power source
On the Spot Price basis, carry out the research of Demand Side Response.Regulate through time-of-use tariffs, realize that Demand Side Response adjusting load and distributed power source reach the purpose of peak load shifting.Distributed power source itself has certain positive peak regulation characteristic for electrical network.And for the energy-storage system in the microgrid, when participating in disappearing peak load, the boundary point that switches as battery operated mode according to the peak and the low ebb zone of load usually.
7, be incorporated into the power networks and isolated island mode switch control
The automatic control with the islet operation mode switch that realized being incorporated into the power networks of microgrid energy management technical method.
The utility model embodiment provides is used for system that the microgrid energy is managed; Intelligent electric meter 11 is gathered information about power; Utilize RS485 bus Modbus rtu protocol that real time data is uploaded to intelligent terminal 13; Intelligent terminal 13 data, the data of inverter 12, bus operation, the secondary device of circle collection intelligent electric meter 11 is on the one hand protected information real-time data etc., and utilizes Ethernet to upload to microgrid system controller 14 institute's image data in real time, receives the microgrid control strategy command information that microgrid system controller 14 issues through the Ethernet ICP/IP protocol on the other hand; Resolve command information and obtain control command; Control constitutes action Executive Module 16 by contactor, circuit breaker, secondary device protective device and carries out corresponding actions, and microgrid system controller 14 receives each intelligent terminal 13 that is connected on the one hand and uploads data, disposal data; And carry out logic determines according to predefined microgrid control strategy; After obtaining microgrid control criterion execution command, return control command and give corresponding intelligent terminal 13, make distributed power source and microgrid become the effective carrier that electrical network is admitted, utilized regenerative resource; Further promote the cascade utilization of the energy; Optimize energy resource structure, promote function and the effect of electrical network in the development low-carbon economy, realized distributed power source optimal control, energy economy scheduling, regenerative resource exert oneself prediction, idle work optimization and voltage control, Demand Side Response, plug and play, be incorporated into the power networks and application function such as isolated island conversion; Embody intelligent grid strong reliable, resist attack, characteristics that economy is high, have important popularization exemplary role.
More than be merely the preferred embodiment of the utility model,, any modification of being done within all spirit at the utility model and the principle, be equal to and replace and improvement etc., all should be included within the protection range of the utility model not in order to restriction the utility model.
Claims (6)
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| CN2011205335855U CN202363902U (en) | 2011-12-19 | 2011-12-19 | System for managing micro-grid energy |
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| CN102420428A (en) * | 2011-12-19 | 2012-04-18 | 天津市电力公司 | A method and system for managing microgrid energy |
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| CN102420428A (en) * | 2011-12-19 | 2012-04-18 | 天津市电力公司 | A method and system for managing microgrid energy |
| TWI478459B (en) * | 2013-01-25 | 2015-03-21 | ||
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| CN103559655B (en) * | 2013-11-15 | 2016-05-25 | 哈尔滨工业大学 | The Forecasting Methodology of the novel feeder line load of microgrid based on data mining |
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