CN104022528B - A kind of microgrid system coordination control method based on multiple elements design energy storage - Google Patents

A kind of microgrid system coordination control method based on multiple elements design energy storage Download PDF

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CN104022528B
CN104022528B CN201410262204.2A CN201410262204A CN104022528B CN 104022528 B CN104022528 B CN 104022528B CN 201410262204 A CN201410262204 A CN 201410262204A CN 104022528 B CN104022528 B CN 104022528B
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energy storage
storage unit
battery
micro
grid
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CN201410262204.2A
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CN104022528A (en
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李建林
房凯
徐少华
惠东
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国家电网公司
中国电力科学研究院
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The present invention provides a kind of microgrid system coordination control method based on multiple elements design energy storage, and the method includes: add flywheel energy storage unit to stabilize voltage output pulsation;When described micro-grid system is incorporated into the power networks, battery energy storage unit and flywheel energy storage unit stabilize distributed generation unit output pulsation;When described micro-grid system off-network is run, battery energy storage unit and diesel-driven generator act alternately as the main power source of micro-grid system;When described micro-grid system is carried out and off-network switches, flywheel energy storage unit and diesel-driven generator provide power support.The method provided by the present invention, improves renewable energy utilization rate, it is achieved electrical network optimized operation;Momentary high power fluctuation and the long time scale of stabilizing photovoltaic output fluctuate;Coordinate control each Distributed-generation equipment, it is ensured that each equipment can in time, co-operating accurately and rapidly.

Description

A kind of microgrid system coordination control method based on multiple elements design energy storage
Technical field
The present invention relates to a kind of micro-grid system control method, a kind of micro-grid system based on multiple elements design energy storage Control method for coordinating.
Background technology
Along with industrialization, urbanization accelerated development and economic globalization deepen continuously, the energy increasingly wide by the whole society General concern, the requirement of energy security, environmental conservation and reply climate change is increasingly serious and prominent,.Optimization of Energy Structure, Carry out energy diversification, clean development, improve energetically and readjust the energy structure, energy resource supply is effectively ensured, be to carve Do not allow to delay, extremely urgent.Actively seek and greatly develop renewable energy power generation and generation of electricity by new energy, have the most far-reaching Realistic meaning and historic significance.In this context, the microgrid based on solar energy has obtained very fast development in recent years, And all will be in the fast-developing phase in for a long time in future.The micro-capacitance sensor set up based on generating in a distributed manner is in structure The most versatile and flexible with running in control, and near load side, also become important renewable energy utilization form.So And, the regenerative resource such as solar energy is affected very big by natural conditions, and generated output has the intermittent and feature of randomness, Compared with traditional thermoelectricity or water power, there is more problem in power supply in terms of generated output stationarity, volume metering.And And, relevant research shows, microgrid has relatively big difference, tradition electrical network to have in structure and operation mechanism with tradition electrical network Bigger machinery inertial and disturbance resistivity, have good operation stability under microvariations.And micro-source of microgrid is most Using inverter, low capacity synchronous generator or asynchronous generator as also network interface, system inertia is the least, to perturbation action Dynamic property and poor stability.Wind-powered electricity generation and the intermittence of photovoltaic output and randomness change, the random switching of load With three-phase imbalance, off-network and and network process etc. can cause microgrid voltage and frequency generation flickering and fluctuation, operation stability Reduce, even unstability.
In microgrid, configure energy storage, by specific control strategy, system dynamic property under perturbation action can be improved Ability with reply dynamic impulsion, it is achieved instantaneous energy balance, and then improve operation stability, improve the quality of power supply, its Effect is equivalent to the inertia of increase system.In recent years, have started to explore stored energy application in renewable of wind-powered electricity generation and photovoltaic etc. Electricity system, by the control to accumulator and flywheel energy storage, to improve the stability of distributed generation system output, Reduce voltage pulsation.Distributed renewable energy power generation is difficult to as independent current source, needs to configure diesel engine and accumulator Deng as standby or compensate, or it be directly accessed electrical network, support as energy using electrical network.Along with distribution type renewable energy Fast-developing and the grid-connected permeability of generating improves, and brings increasing stability and power quality problem to electrical network, Constraining the further development of regenerative resource, therefore, energy storage technology application in microgrid just seems even more important.
Battery class energy storage is little from loss, and energy storage time is long, but cycle life is little, and response speed is slow, adjusts only as load Joint or emergency power supply.Flywheel, ultracapacitor, super conductive magnetic storage energy fast response time, output is big, but energy storage During relatively big from loss, be not suitable for long-time energy storage.By current technical merit, flywheel, ultracapacitor, super The cost of magnetic conduction energy storage is the highest, and Large Copacity to be realized the most also has certain difficulty, normally only be applicable to microgrid Dynamic power compensate using smooth power, burning voltage or the emergency power supply as the short time.For meeting the skill of microgrid Art demand, the multiple elements design energy storage in microgrid should based on realizing jumbo battery class energy storage, and coordinate have fast The speed flywheel energy storage of response characteristic, super conductive magnetic storage energy or ultracapacitor.
Whether multiple elements design energy storage not yet can be widely used in microgrid, and use in multiple elements design energy storage and microgrid Part throttle characteristics is relevant with power supply characteristic.If microgrid contains sensitive load exigent to power supply reliability and defeated simultaneously Going out the new forms of energy that power swing is the biggest, multiple elements design energy storage technology will necessitate.In microgrid, application has simultaneously Large Copacity energy storage characteristic and time there is the multiple energy storage technology of fast power response characteristic, due to different stored energy form correspondences not Same demand, it can independently control.But, if multiple energy storage mode can realize coordinating to control, microgrid can be made to obtain more Good technical performance and higher economic indicator.It is because while that battery class energy storage is for response system dynamic characteristic almost It is helpless, but flywheel, super conductive magnetic storage energy, ultracapacitor can realize Load Regulation to a certain extent, serve as Emergency Power.The coordination of multiple energy storage controls to optimize system structure, reduce device redundancy, improves respond.
In terms of above state-of-the-art, microgrid based on multiple elements design energy storage will become mainly to be deposited the future one of microgrid In one of form.Due to microgrid in structure and the method for operation flexible and changeable, multiple elements design stored energy application there is also in microgrid A series of rationale and key technical problem, including the mechanism of action, planning and the control method etc. of energy storage, need badly Systematic research, develop, demonstrate and assess.Microgrid has grid-connected and two kinds of typical mode of operation of isolated island, and the present invention provides A kind of microgrid system coordination control method based on multiple elements design energy storage, soft to give full play to the control of multiple elements design energy storage Property, play an important role in micro-grid connection operation, islet operation, and the handoff procedure of two kinds of operational modes.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of microgrid system coordination based on multiple elements design energy storage Control method.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:
A kind of microgrid system coordination control method based on multiple elements design energy storage, described micro-grid system includes: battery energy storage list Unit, distributed generation unit, diesel-driven generator, two-way DC/DC changer, wave filter, load, isolating transformer and Mains-power circuit;It is characterized in that, described method includes:
Add flywheel energy storage unit and stabilize voltage output pulsation;
When described micro-grid system is incorporated into the power networks, battery energy storage unit and flywheel energy storage unit stabilize distributed generation unit output Fluctuation;
When described micro-grid system off-network is run, battery energy storage unit and diesel-driven generator act alternately as the main power source of micro-grid system;
When described micro-grid system is carried out and off-network switches, flywheel energy storage unit and diesel-driven generator provide power support.
Preferably, battery energy storage unit and flywheel energy storage unit are stabilized distributed generation unit output pulsation and are included: work as detection Exert oneself to distributed generation unit when there is great fluctuation process, start flywheel energy storage unit and stabilize;When detecting distributed Electric unit is exerted oneself when there is minor swing, starts battery energy storage unit and stabilizes;Described great fluctuation process is distributed generation unit The energy that need to supplement is currently able to the fluctuation during energy of release more than battery energy storage unit;Described minor swing is distributed The energy that electric unit need to supplement is currently able to the fluctuation during energy of release less than battery energy storage unit;Described distributed power generation The energy that unit need to supplement is supplementary for the smooth output of guarantee distributed generation unit.
Preferably, described startup battery energy storage unit carries out stabilizing including: if the SOC value of battery energy storage unit more than or etc. In 0.8, then forbid that energy-storage battery charges, force energy-storage battery to discharge to electrical network, the SOC value of battery energy storage cellular system During less than or equal to 0.5, recover normal and control;If the SOC value of battery energy storage unit is less than or equal to 0.2, then forbid storage Energy battery discharge, forces electrical network to charge to energy-storage battery, when the SOC value of energy-storage system is more than or equal to 0.5, is just recovering Often control.
Preferably, the main power source acting alternately as micro-grid system described in includes: when battery charging reaches the upper limit, then turn Decide electric source modes for battery energy storage unit;When accumulator battery SOC is less than critical conversion value, then open diesel oil Electromotor is powered as main power source, is charged battery energy storage unit simultaneously.
Preferably, the main power source acting alternately as micro-grid system described in includes: battery energy storage unit is decided in electric source modes, stores When set of cells SOC rises to higher limit, exert oneself make battery energy storage unit only operate in put by controlling distributed power generation Electricity condition and discharge power are in set point;When accumulator battery SOC is down to lower limit, distributed by controlling Generated output makes battery energy storage unit only operate in charged state and charge power in set point.
Preferably, described flywheel energy storage unit and diesel-driven generator provide power support to include: net side dead electricity, then by microgrid System disconnects with major network, and micro-grid system proceeds to independent operating state, flywheel energy storage unit provide power to support;If In 1.5 seconds, the success of electrical network reclosing, then time delay 2 seconds, reconnect microgrid after micro-grid system is Tong Bu with line voltage System and major network;If not restoring electricity more than 1.5 seconds net sides, then start diesel-driven generator.
Compared with prior art, the beneficial effects of the present invention is:
When micro-grid connection is run, battery energy storage and flywheel energy storage are combined and are stabilized photovoltaic output pulsation, improve regenerative resource Utilization rate, it is achieved electrical network optimized operation.Utilize capability of fast response and the power density high feature of flywheel energy storage system, come Stabilize the momentary high power fluctuation of photovoltaic output;Utilize the high-energy-density feature of battery energy storage system to stabilize photovoltaic output Long time scale fluctuation.When micro-capacitance sensor off-network is run, according to the difference of main power source form, off-network is run and is divided into two kinds of moulds Formula: electric source modes decided by diesel-driven generator and energy-storage system is decided electric source modes.Micro-capacitance sensor is when also off-network switching, fully Utilize flywheel energy storage fast response time and the high feature of power density, provide for micro-capacitance sensor and support in short-term, it is ensured that parallel-connection network mistake Being smoothed out of journey.
Accompanying drawing explanation
Photovoltaic microgrid based on multiple elements design energy storage layering monitoring management system topology diagram in Fig. 1 the present embodiment;
Photovoltaic microgrid topology diagram based on multiple elements design energy storage in Fig. 2 the present embodiment.
In Fig. 3 the present embodiment, energy-storage system smooths control strategy flow chart;
In Fig. 4 the present embodiment, photovoltaic micro-grid connection based on multiple elements design energy storage runs control flow chart;
In Fig. 5 the present embodiment, photovoltaic microgrid off-network based on multiple elements design energy storage runs control flow chart;
Flywheel and diesel-driven generator mixed energy storage system control flow chart when in Fig. 6 the present embodiment, also off-network switches.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
It is an object of the invention to considering present in microgrid on the basis of many distributed power sources, propose one and can remain micro- The coordination control strategy of net safe and stable operation.In the micro power network containing many Distributed-generation equipment, coordinate to control respectively Distributed-generation equipment, it is ensured that each equipment can in time, coordination accurately and rapidly.
As a example by photovoltaic microgrid system, Fig. 1 is photovoltaic microgrid based on multiple elements design energy storage layering monitoring management system topology Structure.Micro-capacitance sensor monitoring management system is from power distribution network dispatch layer, micro-capacitance sensor central control level, distributed power source and load just Ground three aspects of key-course carry out integrated management and control.Its at the middle and upper levels power distribution network dispatch layer mainly from power distribution network safe, The angle coordinated scheduling micro-capacitance sensor of economical operation, makes micro-capacitance sensor show as single controlled cell, micro-electricity relative to bulk power grid Net accepts the regulation control command of higher level's power distribution network.Middle micro-capacitance sensor central control level centralized management distributed power source and all kinds of Load, is responsible for when micro-grid connection is run realizing the maximization of micro-capacitance sensor value and optimize micro-capacitance sensor running, transports in off-network Regulate distributed power source during row to exert oneself and the electricity consumption situation of each type load realizes the steady state Safe Operation of micro-capacitance sensor.Lower floor is distributed Formula power-supply controller of electric and load governor, be responsible for transient power balance and the UFLS of micro-capacitance sensor, it is achieved micro-capacitance sensor transient state Time safe operation.Fig. 2 is photovoltaic microgrid topology diagram based on multiple elements design energy storage;As it can be seen, the present embodiment The topological structure of the micro-grid system related to includes photovoltaic generating system, battery energy storage system, flywheel energy storage system, diesel oil Electromotor, two-way DC/DC changer, LC wave filter and load and mains-power circuit.
The monitoring system monitoring range of the battery energy storage system configuration described in the present embodiment covers temperature, electric current, battery capacity Etc. each side.For the temperature at each main operation position of energy-storage system, temperature sensors of high precision is used to measure system in real time System temperature, to ensure that system operates steadily efficiently.The measurement of discharge current and charging current is also real-time, and system is same Time real-time monitoring voltage value, with ensure system run in the best condition, extend system use the time.All of monitoring Data comprehensively will be monitored real-time data transmission to micro-capacitance sensor monitoring management by communication bus system afterwards by subsystem data System.The longest every important service data of photovoltaic of storage in 5 minutes, including environmental data.In order to ensure accumulator Maximum service life (MSL), need, in running a period of time, accumulator is carried out manual maintenance, arrange in control strategy and entirely fill Full mode playback, manual operation is first opened bavin and is sent out that accumulator battery carries out " preliminary filling-fill soon-all fill-floating charge " four-part form standard charging is straight To entirely charging into, then control accumulator battery and be in discharge condition all the time until entirely discharge into, improve accumulator with this as far as possible Service life cycle.
Microgrid monitoring management system described in the present embodiment, uses the control strategy of multi-zone supervision.Micro-capacitance sensor monitoring management system System is combined from power distribution network dispatch layer, micro-capacitance sensor central control level, distributed power source and load three aspects of key-course on the spot Close management and control.Its at the middle and upper levels power distribution network dispatch layer mainly from the safety of power distribution network, the angle coordinated scheduling of economical operation Micro-capacitance sensor, makes micro-capacitance sensor show as single controlled cell relative to bulk power grid, and micro-capacitance sensor accepts the regulation of higher level's power distribution network Control command.Middle micro-capacitance sensor central control level centralized management distributed power source and each type load, run in micro-grid connection Time be responsible for realizing maximization that micro-capacitance sensor is worth and optimize micro-capacitance sensor and run, when off-network is run, regulation distributed power source is exerted oneself Electricity consumption situation with each type load realizes the steady state Safe Operation of micro-capacitance sensor.Lower floor's distributed power controller and spatial load forecasting Device, is responsible for transient power balance and the UFLS of micro-capacitance sensor, it is achieved safe operation during micro-capacitance sensor transient state.
Each distributed power source in the micro-grid system that the present embodiment relates to, uses rational coordination control strategy, it is ensured that each point Cloth power supply can action correct, timely, rational, thus ensure the safe and stable operation of micro-capacitance sensor.Specific as follows:
(1) energy management research is coordinated in photovoltaic, Chai Fa, energy storage
Formulate photovoltaic system, battery energy storage, diesel-driven generator joint segmentation coordinated management strategy, it is ensured that the micro-electricity of photovoltaic/energy storage The stable operation of net.When being incorporated into the power networks, photovoltaic output pulsation is stabilized in energy storage, it is ensured that the friendly access of photovoltaic system;Off-network During operation, energy-storage system making main power source, energy accumulation current converter uses V/f to control to provide voltage and frequency to support;Work as accumulator It is load supplying as main power source, associating photovoltaic system that group SOC value opens diesel-driven generator the most in limited time, unnecessary electric energy pair Accumulator battery is charged.
(2) coordination control strategy research between flywheel, battery energy storage
When being incorporated into the power networks, battery energy storage and flywheel energy storage are combined and are stabilized photovoltaic output pulsation, improve renewable energy utilization rate, Realize electrical network optimized operation.Photovoltaic system uses MTTP to control, it is ensured that the EIAJ of photovoltaic system.But photovoltaic system Exert oneself and affected by various natural causes, therefore exerting oneself of photovoltaic system has undulatory property, needs to utilize energy-storage system to carry out Stabilize fluctuation.Utilize capability of fast response and the power density high feature of flywheel energy storage system, stabilize the wink of photovoltaic output Time high-power fluctuation, i.e. monitoring system detect distributed generation system exert oneself exist great fluctuation process (for ensure distributed The energy that supplements needed for electricity system output smoothing current more than battery energy storage system releasable energy time fluctuation) time, Start flywheel energy storage system great fluctuation process is stabilized, it is ensured that the safe and stable operation of whole system.Utilize battery energy storage system The high-energy-density feature of system stabilizes the long time scale fluctuation of photovoltaic output, i.e. monitoring system by minor swing (for ensureing The energy supplemented needed for distributed generation system output smoothing current less than battery energy storage system releasable energy time ripple Dynamic) signal is transferred to energy-storage system, and system is exerted oneself and is stabilized according to receiving fluctuation signal by energy-storage system, transports at this kind Under row mode, if the SOC of battery energy storage system is more than or equal to 0.8, then control system will forbid that energy-storage battery continues to fill Electricity, forces battery energy storage system to discharge to electrical network, when the SOC of energy-storage system is less than or equal to 0.5, recovers normal and controls; If the SOC of battery energy storage system is less than or equal to 0.2, then control system will forbid that energy-storage battery continues electric discharge, force electricity Net is to energy-storage battery punching electricity, when the SOC of energy-storage system is more than or equal to 0.5, recovers normal and controls.
Fig. 3 is that battery energy storage system smooths control strategy flow chart.Key step includes:
Step one: the meritorious P filtered device filtering of photovoltaic generating system output generates signal P+;
Step 2: newly-generated signal P+ and signal P-(P-=P) does difference, and the signal of generation is as battery energy storage system Setting signal.
So in actual motion, power P * and photovoltaic generating system sent by battery energy storage system of exerting oneself of system external The P that exerts oneself (P-=P) sum, the smooth output for wave filter that what i.e. whole system was external exert oneself.
Fig. 4 is that photovoltaic micro-grid connection based on multiple elements design energy storage runs control flow chart.Key step includes:
Step one: first, when being incorporated into the power networks, photovoltaic system is operated in MTTP operating point, it is ensured that exert oneself photovoltaic Make full use of;
Step 2: meanwhile, puts into battery energy storage system, in order to stabilize the minor swing of photovoltaic output, it is ensured that photovoltaic system The friendly access of system;
Step 3: by being monitored bearing power in operation, when load-side exists high-power fluctuation, utilizes flywheel Energy-storage system fast response time and the big feature of power density, smoothing system is exerted oneself.
Terminal voltage/the SOC of energy-storage system to be monitored, when the terminal voltage of energy-storage system by grid-connected work process simultaneously When/SOC reaches marginal value, ensured the safe and stable operation of energy-storage system by corresponding control strategy.
(3) photovoltaic microgrid system based on multiple elements design energy storage involved by the present embodiment, when major network fault or dead electricity, It is operated in off-network running status, and energy-storage system is operated alternately as main power source with diesel-driven generator.
Fig. 5 is that photovoltaic microgrid off-network based on multiple elements design energy storage runs control flow chart.According to main power source when off-network is run Difference, be divided into two kinds of off-network mode of operations.Specific as follows:
Pattern one: electric source modes of deciding sent out by bavin.
In such a mode, diesel-driven generator, as system main power source, produces constant voltage and frequency support system is run; Energy-storage system carries out charge/discharge according to actual condition, until accumulator battery state-of-charge (State of Charge, SOC) value/end electricity Pressure reaches limit value.Consider that bavin is sent out minimum power and the rated power etc. of running and limited, can be exerted oneself by control photovoltaic and ensure bavin Send out in the zone of reasonableness operating in setting.When battery charging reaches the upper limit, then transfer energy-storage system to and do main power source mould Formula is run.Separate unit diesel-driven generator optimal load rate is about 75%, has both comprised certain margin of power, and economy is the most relative Higher.Minimum load requires generally about 30%, and less than this value, diesel-driven generator unit power fuel consumption can be relatively big, Affect the service life of diesel-driven generator simultaneously.By measuring, monitoring and control, the diesel-driven generator that Reasonable adjustment accesses Number of units, it is ensured that the economy of microgrid, stable and safe operation.
Pattern two: energy-storage system is decided electric source modes.
When energy-storage system makees main power source, bavin is sent out and is closed to avoid non-synchronous paired running, and energy storage two way convertor uses V/f Controlling to be that ac bus provides voltage and frequency to support, the output of its power automatically compensates photovoltaic and exerts oneself and difference between load. Energy storage optimal control based on accumulator battery SOC value/terminal voltage, it is desirable to exert oneself abundance at photovoltaic and make accumulator battery SOC When value/terminal voltage rises to higher limit, exerted oneself by control photovoltaic and ensure that energy-storage system only operates in discharge condition and electric discharge merit Rate is in set point.When accumulator battery SOC value/terminal voltage is down to lower limit, is exerted oneself by control photovoltaic and ensure storage System can only operate in charged state and charge power in set point.Time properly functioning, Optimal Control Strategy makes as far as possible Energy-storage system is in fixing duty, it is to avoid charged state and the frequent switching of discharge condition.When accumulator battery SOC When value/terminal voltage is less than critical conversion value, opens diesel-driven generator and power as main power source, change PCS control strategy to storage Set of cells is charged, and is i.e. converted to diesel-driven generator and decides electric source modes.
(4) and off-network switching time, flywheel and the coordination control strategy of diesel-driven generator mixed energy storage system:
Flywheel and diesel-driven generator mixed energy storage system control flow chart when Fig. 6 is also off-network switching.As it can be seen, microgrid When connecting major network and being properly functioning, flywheel is as energy buffer.Net side dead electricity, then disconnect microgrid with major network, Microgrid proceeds to independent operating state, is temporarily provided power to support by flywheel.If in 1.5s (reclosing typical time period), The success of electrical network reclosing, then time delay 2s, reconnect microgrid and major network after microgrid is Tong Bu with line voltage.If exceeding coincidence Lock time net side restores electricity not yet, then started diesel-driven generator by controller.The startup of diesel-driven generator stable output The typical time period of voltage about 16s, during this period of time, is provided power to support by flywheel energy storage.Diesel-driven generator starts successfully After, time delay 2s, closes a floodgate after combining inverter with diesel-driven generator voltage synchronous.
Finally should be noted that: above example only in order to illustrate that technical scheme is not intended to limit, although Being described in detail the present invention with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still The detailed description of the invention of the present invention can be modified or equivalent, and appointing without departing from spirit and scope of the invention What amendment or equivalent, it all should be contained in the middle of scope of the presently claimed invention.

Claims (4)

1. a microgrid system coordination control method based on multiple elements design energy storage, described micro-grid system includes: Battery energy storage unit, distributed generation unit, diesel-driven generator, two-way DC/DC changer, wave filter, negative Load, isolating transformer and mains-power circuit;It is characterized in that, described method includes:
Add flywheel energy storage unit and stabilize voltage output pulsation;
When described micro-grid system is incorporated into the power networks, battery energy storage unit and flywheel energy storage unit stabilize distributed power generation list Unit's output pulsation;
When described micro-grid system off-network is run, battery energy storage unit and diesel-driven generator act alternately as micro-grid system Main power source;
When described micro-grid system is carried out and off-network switches, flywheel energy storage unit and diesel-driven generator provide power to prop up Hold;
Described battery energy storage unit and flywheel energy storage unit are stabilized distributed generation unit output pulsation and are included: work as inspection Measure distributed generation unit and exert oneself when there is great fluctuation process, start flywheel energy storage unit and stabilize;When detecting Distributed generation unit is exerted oneself when there is minor swing, starts battery energy storage unit and stabilizes;Described great fluctuation process is The energy that distributed generation unit need to supplement is currently able to the fluctuation during energy of release more than battery energy storage unit; Described minor swing is that the energy that distributed generation unit need to supplement is currently able to release less than battery energy storage unit Fluctuation during energy;The energy that described distributed generation unit need to supplement is for ensureing the flat of distributed generation unit Sheave out and supplement;
Described startup battery energy storage unit carries out stabilizing including: if the SOC value of battery energy storage unit is more than or equal to 0.8, then forbid that energy-storage battery charges, force energy-storage battery to discharge to electrical network, the SOC of battery energy storage cellular system When value is less than or equal to 0.5, recovers normal and control;If the SOC value of battery energy storage unit is less than or equal to 0.2, Then forbidding that energy-storage battery discharges, force electrical network to charge to energy-storage battery, the SOC value of energy-storage system is more than or equal to When 0.5, recover normal and control.
2. the method for claim 1, it is characterised in that described in act alternately as the main electricity of micro-grid system Source includes: when battery charging reaches the upper limit, then transfer battery energy storage unit to and decide electric source modes;Work as storage When set of cells SOC is less than critical conversion value, then opens diesel-driven generator and power as main power source, simultaneously Battery energy storage unit is charged.
3. the method for claim 1, it is characterised in that described in act alternately as the main electricity of micro-grid system Source includes: battery energy storage unit is decided in electric source modes, when accumulator battery SOC rises to higher limit, logical Cross control distributed power generation exert oneself make battery energy storage unit only operate in discharge condition and discharge power set model In enclosing;When accumulator battery SOC is down to lower limit, is exerted oneself by control distributed power generation and make battery energy storage Unit only operates in charged state and charge power in set point.
4. the method for claim 1, it is characterised in that described flywheel energy storage unit and diesel generation Machine provides power support to include: net side dead electricity, then disconnected with major network by micro-grid system, and micro-grid system proceeds to Independent operating state, is provided power to support by flywheel energy storage unit;If in 1.5 seconds, electrical network reclosing becomes Merit, then time delay 2 seconds, reconnect micro-grid system and major network after micro-grid system is Tong Bu with line voltage;If exceeding Within 1.5 seconds, net side does not restores electricity, then start diesel-driven generator.
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