CN104716644A - Renewable energy source cooling, heating and power microgrid system and control method - Google Patents

Renewable energy source cooling, heating and power microgrid system and control method Download PDF

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Publication number
CN104716644A
CN104716644A CN201510102430.9A CN201510102430A CN104716644A CN 104716644 A CN104716644 A CN 104716644A CN 201510102430 A CN201510102430 A CN 201510102430A CN 104716644 A CN104716644 A CN 104716644A
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China
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power
water tank
heat storage
electricity
variable power
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CN201510102430.9A
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Chinese (zh)
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CN104716644B (en
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张承慧
石可颂
孙波
魏大钧
陈阿莲
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山东大学
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B29/00Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • 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
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects
    • 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 invention discloses a renewable energy source cooling, heating and power microgrid system and a control method. The renewable energy source cooling, heating and power microgrid system comprises a power module and a cooling/heating module. According to the power module, a solar power generation system is sequentially connected with a DC/DC converter and a DC/AC converter in series and then connected with an AC bus, a wind power generation system is sequentially connected with an AC/DC converter and a DC/AC converter and then connected with the AC bus, a gas internal combustion generation system is directly connected with the AC bus, a storage battery pack is connected with the AC bus through a bi-directional DC/AC converter, variable power electricity storage hot water tanks are connected with the AC bus, and the AC bus is connected with a power distribution network through a PCC. The renewable energy source cooling, heating and power microgrid system and the control method have the advantages that clean renewable energy sources such as methane, wind energy and solar energy are adopted as energy sources of a cooling, heating and power microgrid, no pollution is caused to the environment, operation cost is very low, and the application range is wide; by the adoption of a multi-microsource energy supply mode, the problem of capacity allocation redundancy of a single energy supply system can be solved.

Description

A kind of regenerative resource cool and thermal power micro-grid system and control method
Technical field
The present invention relates to regenerative resource cool and thermal power micro-grid system and the control method of renewable energy power generation technical field, particularly one kind of multiple driven by energy.
Background technology
1, cool and thermal power micro-grid system is based upon on the basis of cascaded utilization of energy and the mutual coordinated operation in each micro-source, multiple-energy-source form cooperatively interacts, simultaneously can provide hot and cold to user, electricity three kinds of energy, not only can improve the operational efficiency of system, reduce energy waste, greatly can also improve the stability of system cloud gray model.
2, China's cooling heating and power generation system utilizes gas turbine as prime mover mostly, but when capacity is less (as 30kW ~ 50kW grade), miniature gas turbine compared by internal combustion engine is all have obvious advantage in efficiency and performance or on cost.The electrical efficiency of oil-electric engine group is generally more than 30%, and apparently higher than gas turbine, operating load characteristic is good, cheap, starts rapidly, is easy to production domesticization and large-scale promotion.Therefore, internal combustion engine has advantageous advantage and application prospect widely in small distributed energy supplying system.
3, with internal combustion engine as prime mover driven synchronous generator generating, can have an appointment 2/3rds Conversion of Energy be that heat depends among flue gas and jacket water.Iff considering the use of electric energy, the heat dissipation in high-temperature flue gas and cylinder sleeve hot water among environment, then causes a large amount of thermal waste.And cooling heating and power generation system can utilize internal combustion engine generator group to produce electric energy, with the use of waste-heat recovery device, lithium-bromide absorption-type refrigerating machine etc., make full use of high-temperature flue gas that internal combustion engine discharges and cylinder sleeve hot water produces cold water and hot water, meet that user is hot and cold, electrical load requirement.
4, by retrieving existing patent, find that publication No. is the patent of invention of CN 103034204A: a kind of cooling heating and power generation system and dispatching method, this system is by taking natural gas as fuel, employing gas turbines driving generators is powered, by electric air-conditioning, ice storage air conditioner cooling, waste-heat recovery device heat supply.This system capacity source is single, if consider peak load during configuration capacity, there is system configuration redundancy issue; Lack heat-storing device, electric heating is coupled completely, easily causes the waste of the energy; Adopt electric refrigeration modes, during summer, thermal load demands is less, and a large amount of heat energy is wasted, and system energy utilance is lower.The patent of invention of publication number CN101055121A, Minisize distributed type solar energy driven combining system for supplying cool, hot energy and electricity, its heat energy is mainly derived from solar collector, and system restricts by weather conditions, and effective run time is shorter.
By the analysis to existing system and patent, current cooling heating and power generation system, supply unit is gas turbine, internal combustion engine or solar collector mainly.But adopting solar collector as origin of heat, system is serious by weather conditions restriction, cannot ensure that the running time of system and energy stabilization export.And single gas turbine or gas internal-combustion engine make system prime mover, system adopts usually " electricity determining by heat " or " with the fixed heat of electricity " pattern.Because internal combustion engine generator group electricity, thermal output have strong coupling, no matter adopt which kind of operational mode, all cannot ensure whole utilizations of electricity, heat.And two kinds of patterns all need to adjust gas turbine in real time or internal combustion engine is exerted oneself, and therefore system reliability is poor, and unit can not run on efficient district all the time, and energy utilization rate is lower, but also can affect internal-combustion engine life-span.
Current micro-grid system only considers control and the use of electric energy mostly, but the micro-grid system be only made up of photoelectricity, wind-powered electricity generation, energy storage is comparatively large by weather effect, if could not get on to the Net, also can cause the waste of electric energy.And the micro-grid system configuring internal combustion engine generator unit does not often consider waste heat recovery, cause a large amount of heat-energy losses.
Summary of the invention
Object of the present invention is exactly to solve the problem, propose a kind of regenerative resource cool and thermal power micro-grid system and control method, utilize solar energy, wind energy to generate electricity with clean gas to combine, configuration heat exchanger, lithium-bromide absorption-type refrigerating machine, heat accumulation, storage cold water storage cistern etc., by cooperatively interacting of each system unit, for load provide hot and cold, the energy of electricity three kinds of forms, be conducive to stability and the economy of system cloud gray model, ensure the reliability service of system.
To achieve these goals, the present invention adopts following technical scheme:
A kind of regenerative resource cool and thermal power micro-grid system, comprising: electric module and cold/thermal modules; Described electric model calling on ac bus, cold/thermal modules by heat storage water tank as energy transferring device; System can run on cold, heat and electricity triple supply operational mode or cogeneration pattern according to actual needs;
Described electric module comprises: solar power system, wind generator system, combustion gas internal combustion electricity generation system, batteries and variable power electricity heat storage water tank I and variable power electricity heat storage water tank II; Solar power system is connected incoming transport bus after DC/DC converter and DC/AC converter successively, wind generator system is connected incoming transport bus after AC/DC converter and DC/AC converter successively, the direct incoming transport bus of combustion gas internal combustion electricity generation system, batteries is incoming transport bus after two-way DC-AC converter, variable power electricity heat storage water tank is connected with ac bus, and ac bus is connected with power distribution network through PCC.
Described cold/thermal modules comprises: solar collector, gas internal-combustion engine, variable power electricity heat storage water tank I, variable power electricity heat storage water tank II, storage cold water storage cistern, cigarette-water-to-water heat exchanger, water-water heat exchanger I, water-water heat exchanger II, cistern and hot water lithium bromide refrigeration machine; Gas internal-combustion engine is communicated with water-water heat exchanger I respectively with cigarette-water-to-water heat exchanger, described cigarette-water-to-water heat exchanger and water-water heat exchanger I are communicated with variable power electricity heat storage water tank II with variable power electricity heat storage water tank I respectively, after described solar collector is communicated with cistern, be communicated with variable power electricity heat storage water tank II with cigarette-water-to-water heat exchanger, water-water heat exchanger I, variable power electricity heat storage water tank I respectively;
Described hot water lithium bromide refrigeration machine is communicated with variable power electricity heat storage water tank II respectively with variable power electricity heat storage water tank I, air-conditioning system is accessed after being sequentially connected in series water-water heat exchanger II, storage cold water storage cistern in described hot water lithium bromide refrigeration machine one end, and the hot water lithium bromide refrigeration machine other end is communicated with cooling tower.
Described lithium bromide refrigerator chilled water refluxes after water-water heat exchanger II, forms the circulation of A side; Described water-water heat exchanger II is communicated with storage cold water storage cistern, forms the circulation of B side.
The driving hot water of described hot water lithium bromide refrigeration machine is provided by variable power electricity heat storage water tank I, by temperature step-down after the acting of the hot water of hot water lithium bromide refrigeration machine, pass into variable power electricity heat storage water tank II to provide living-hygienic hot water or heat temperature raising again.
System cloud gray model is when cold, heat and electricity triple supply operational mode, and wind generator system and solar power system work in maximum power output state all the time; Combustion gas internal combustion electricity generation system adopts PQ to control when being incorporated into the power networks, when from network operation, by combustion gas internal combustion electricity generation system and batteries jointly for system provides electric voltage frequency to support, wherein based on combustion gas internal combustion electricity generation system, batteries plays auxiliary transitional function;
Cigarette-water-to-water heat exchanger heat outputting coolant-temperature gage is passed into heat storage water tank I storage of variable power electricity at more than design temperature A; The hot water of more than the design temperature A exported by solar collector passes into the storage of variable power electricity heat storage water tank I, and the hot water in design temperature [B, the A] scope export solar collector passes into the storage of variable power electricity heat storage water tank II; The hot water of more than design temperature B combustion gas internal combustion electricity generation system produced through water-water heat exchanger I passes into the storage of variable power electricity heat storage water tank II;
Variable power electricity heat storage water tank I provides driving hot water to lithium bromide refrigerator, provides living-hygienic hot water according to load condition simultaneously, and variable power electricity heat storage water tank II provides living-hygienic hot water.
System cloud gray model is when cogeneration pattern, and lithium bromide refrigerator is out of service, and co-feeding system only provides electricity, heat two kinds of form of energy; Identical with cold, heat and electricity triple supply operational mode, wind generator system and solar power system work in maximum power output state all the time; Combustion gas internal combustion electricity generation system and adopt PQ to control under net state, under net state, by gas internal combustion electric generator group and batteries jointly for system provides electric voltage frequency to support, wherein based on internal combustion engine generator, batteries is auxiliary;
Variable power electricity heat storage water tank I top is hot water inlet, bottom connects variable power electricity heat storage water tank II top through pipeline, during variable power electricity heat storage water tank I full water, variable power electricity heat storage water tank II just has hot water to enter, and the use order of hot water is then preferentially use the hot water in variable power electricity heat storage water tank II.
A control method for regenerative resource cool and thermal power micro-grid system, comprising:
Grid-connected under real-time monitoring system normal operating condition and from net state, does not consider time-of-use tariffs situation,
If system is in from net state, then adopt " with the fixed heat of electricity " pattern, concrete control method is:
(1) P lremain unchanged, and during storage battery SOC≤D1, if P 2+ P 3increase Δ P, then adopt batteries to store energy, until storage battery is full of; After storage battery is full of, the electrical heating power of corresponding increase variable power electricity heat storage water tank is dissolved unnecessary electric energy, if now Δ P>=λ 1x, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine and exert oneself, make variable power electricity heat storage water tank electrical power P 4< λ 1x;
(2) P lremain unchanged, and during storage battery SOC>D1, if P 2+ P 3increase Δ P, then corresponding increase variable power electricity heat storage water tank electrical heating power; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X, residual electricity power is dissolved by variable power electricity heat storage water tank;
(3) P lincrease or P 2+ P 3when reducing Δ P, first corresponding reduction variable power electricity heat storage water tank electrical heating power, if Δ P>P 4, supplement not enough electrical power by batteries; Stepped control method increasing combustion engine is adopted to exert oneself, if internal combustion engine generator electromotive power output P afterwards 1be maximum, then excised load step by step by load rating principle;
(4) P lreduce, and during storage battery SOC≤D1, first storage battery is charged, until be full of; After storage battery is full of, the electrical heating power of corresponding increase variable power electricity heat storage water tank is dissolved unnecessary electric energy, if now Δ P>=λ 1x, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine and exert oneself, make variable power electricity heat storage water tank electrical power P 4< λ 1x;
During storage battery SOC>D1, skip charge in batteries link, unnecessary electric energy directly increases variable power electricity heat storage water tank electrical heating power;
Wherein, P 1for internal combustion engine generator electromotive power output, P 2for solar power system electromotive power output, P 3for wind generator system electromotive power output, T setfor setting-up time threshold value, D1, λ 1for set point, P lfor electric loading power, X is internal combustion engine generator group " Stepped control " power unit set point.
If system is in grid-connected upper net state, system cloud gray model adopts " electricity determining by heat " pattern, because system configuration has variable power electricity heat storage water tank, combustion gas internal combustion electricity generation system is run by heat load prediction mean value; Concrete control method is:
Q 1+ Q 2>Q ltime, waste heat is stored in variable power electricity heat storage water tank; Q 1+ Q 2<Q ltime, not enough heat is supplemented by variable power electricity heat storage water tank, and still during deficiency, increasing combustion engine is exerted oneself or started variable power electricity heat storage water tank electric heating function; Batteries does not work, and unnecessary power delivery is to power distribution network; Electric energy is supplemented by bulk power grid time not enough; Wherein, Q 1for generator heat outputting power, Q 2for solar energy heat outputting power, Q lfor system cooling and heating load.
If system is in and does not grid-connectedly go up net state, concrete control method is:
(1) P lremain unchanged, during storage battery SOC≤D2, if P 2+ P 3increase Δ P, then adopt batteries to store energy; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X; When storage battery reaches capacity state, then residual electricity power is for increasing the heating power of variable power electricity heat storage water tank;
(2) P lremain unchanged, during storage battery SOC>D2, if P 2+ P 3increase Δ P, then increase the electrical heating power of variable power electricity heat storage water tank; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X, residual electricity power is dissolved by variable power electricity heat storage water tank;
(3) P lwhen remaining unchanged, if P 2+ P 3reduce Δ P, now, if variable power electricity heat storage water tank P 4>0, first corresponding reduction P 4if, P 4be decreased to zero and still cannot compensate Δ P, then from electrical network power purchase P=Δ P-P 4;
If P> is λ 2x, and duration T>=T set, generator electromotive power output P 1do not reach maximum, then generator electromotive power output P 1export and increase X, unnecessary electric energy is dissolved by variable power electricity heat storage water tank;
(4) P lduring increase, first corresponding reduction variable power electricity heat storage water tank P 4, P 4still cannot meet when=0, then by electrical network power purchase, purchase of electricity P=P l-P 4if, P> λ 2x, and duration T>=T set, P 1do not reach maximum, then P 1increase by Stepped control mode, recruitment is greater than P, and unnecessary electric energy is dissolved by electric heat storage water tank;
(5) P lduring reduction, first corresponding increase variable power electricity heat storage water tank P 4, P 4>=λ 1x, and duration T>=T settime, then reduce combustion gas internal combustion electricity generation system according to Stepped control mode and exert oneself, until P 4< λ 1x;
Wherein, P 1for internal combustion engine generator electromotive power output, P 2for solar power system electromotive power output, P 3for wind generator system electromotive power output, P 4for heat storage water tank electrical heating power, T setfor setting-up time threshold value, D2, λ 1, λ 2for set point, P lfor electric loading power, X is internal combustion engine generator group " Stepped control " power unit set point.
If consideration time-of-use tariffs, when system grid connection is run, make when electricity price is higher internal combustion engine generator group completely send out, sell unnecessary electric energy to electrical network; When electricity price is lower, reduces internal combustion engine generator group and exert oneself, increase purchase of electricity, increase electric heat storage water tank power simultaneously, carry out energy storage with hot water form.
The invention has the beneficial effects as follows:
1, cool and thermal power microgrid adopts clean reproducible energy biogas, wind energy, solar energy to be energy source, and to environment without any pollution, and operating cost is very low, and the scope of application is wider.How micro-source energy-provision way, can solve single energy supplying system capacity configuration redundancy issue.
2, adopt two heat storage water tank, hot water separately can be stored by temperature range, realize the cascaded utilization of energy of different temperatures hot water, compare single layer-stepping heat storage water tank energy storage better effects if.
3, heat storage water tank has electric heating function, and power continuously adjustabe.Electrical heating power can be regulated in real time according to the change of load and energy output from during network operation, can as variable load keeping system power-balance, thus ensure the stable of system voltage frequency, can avoid frequently regulating exerting oneself of internal combustion engine generator group, improve generating set service life and operational efficiency.In addition, heat storage water tank is dissolved as system the new way of unnecessary electric energy, can reduce the configuration capacity of storage battery in microgrid, reduce system cost.And when being incorporated into the power networks, can need and time-of-use tariffs according to load equally, in section, water tank is heated in seclected time, improve system economy.
4, internal combustion engine cylinder jacket hot water, lithium bromide refrigerator chilled water displaces hot water, cold water by heat exchanger.During external load variations, utilize the buffering of water tank, memory action, ensure that internal combustion engine and refrigeration machine run in efficient district.
5, the power output of internal combustion engine generator group adopts " Stepped control " mode, and with X (kW) for unit (numerical value of X can be determined by load curve rate of change), the part that system electrical power exceeds workload demand is dissolved by electric heat storage water tank.This control mode can solve internal combustion engine generator group and run a delayed difficult problem, greatly reduces internal combustion engine generator group simultaneously and controls difficulty and control frequency, effectively improve unit durability.
Accompanying drawing explanation
Fig. 1 is regenerative resource cool and thermal power micro-grid system summer operation structure chart of the present invention;
Fig. 2 is regenerative resource cool and thermal power micro-grid system winter operation structure chart of the present invention;
Fig. 3 is regenerative resource cool and thermal power micro-grid system spring and autumn operating structure figure of the present invention;
Fig. 4 is that the present invention allows system control process figure in power delivery bulk power grid (namely going up net state) situation;
Fig. 5 is that the present invention does not allow system control process figure in power delivery bulk power grid (namely not going up net state) situation.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
Cool and thermal power micro-grid system is made up of electric module and cold/thermal modules two large divisions.
Electricity module comprises solar panel, wind-driven generator, gas internal combustion electric generator group, batteries, electric heat storage water tank, electric loading etc.Each generating, energy-storage units are linked together by ac bus (380V, 50Hz).Concrete connected mode is as shown in Figure 1: solar power system is connected to ac bus after DC-DC-AC conversion, wind-driven generator is connected to ac bus after AC-DC-AC conversion, the direct incoming transport bus of gas internal combustion electric generator group, batteries is connected with ac bus through two-way DC-AC converter.Ac bus is connected with power distribution network through PCC.Electricity heat storage water tank is connected with ac bus, and power continuously adjustabe.
System is cold/and thermal modules mainly comprises solar collector, gas internal combustion electric generator group, heat storage water tank, storage cold water storage cistern, heat exchanger, hot water lithium bromide refrigeration machine.Other assembly comprises pipeline, water pump, valve, cistern, fan coil etc.
Combustion gas internal combustion electricity generation system is communicated with water-water heat exchanger I respectively with cigarette-water-to-water heat exchanger, cigarette-water-to-water heat exchanger and water-water heat exchanger I are communicated with variable power electricity heat storage water tank II with variable power electricity heat storage water tank I respectively, after solar collector is communicated with cistern, be communicated with variable power electricity heat storage water tank II with variable power electricity heat storage water tank I; Hot water lithium bromide refrigeration machine is communicated with variable power electricity heat storage water tank II respectively with variable power electricity heat storage water tank I, air-conditioning system is accessed after being sequentially connected in series water-water heat exchanger II, storage cold water storage cistern in hot water lithium bromide refrigeration machine one end, and the hot water lithium bromide refrigeration machine other end is communicated with cooling tower.
The high-temperature flue gas that gas internal combustion electric generator group produces passes into cigarette-water-to-water heat exchanger, and the hot water selectivity displaced passes into variable power electricity heat storage water tank I or variable power electricity heat storage water tank II, and the flue gas after heat exchange directly enters air.Internal combustion engine cylinder jacket hot water passes into water water-to-water heat exchanger I, and backwater flows into internal combustion engine, and B side passes into variable power electricity heat storage water tank II after heat exchange.Solar collector is when leaving water temperature reaches set point, and selectivity passes into variable power electricity heat storage water tank I or variable power electricity heat storage water tank II.Solar collector and cigarette-water-to-water heat exchanger enter water can from cistern, also can from electric heat storage water tank.Hot water lithium bromide refrigeration machine drives hot water from variable power electricity heat storage water tank I, by temperature step-down after the acting of the hot water of refrigeration machine, passes into variable power electricity heat storage water tank II to provide living-hygienic hot water or heat temperature raising again.Lithium bromide refrigerator chilled water refluxes after water-water heat exchanger II, and form the circulation of A side, storage cold water storage cistern and water-water heat exchanger II form B side and circulate.The cooling water of lithium bromide refrigerator passes into cooling tower cooling.Air-conditioning cold, the hot blast of whole system pass into fan coil by hot water or cold water and provide.
Cool and thermal power micro-grid system only at summer operation in cold, heat and electricity triple supply pattern, other season runs on cogeneration pattern.
Cold, heat and electricity triple supply operational mode: in system, wind power generation and photovoltaic generation work in maximum power output state all the time, ensures the peak use rate of regenerative resource.Storage battery, according to system and from net state, considers system loading situation, and the factor such as time-of-use tariffs carries out operation of charging or discharge.Gas internal combustion electric generator group adopts PQ to control when being incorporated into the power networks, and avoids frequently changing power output, improves unit useful life.During from network operation, by internal combustion engine generator group and batteries for system provides voltage, frequency to support, wherein based on internal combustion generating set, have hysteresis quality because internal combustion engine generator group exports, batteries plays transition booster action.
As shown in Figure 1, during summer operation, by controlling cigarette-water-to-water heat exchanger B effluent amount, making it export hot water more than 90 DEG C, passing into the storage of variable power electricity heat storage water tank I; When solar collector heat outputting coolant-temperature gage is more than 90 DEG C, pass into heat storage water tank I storage of variable power electricity, if due to weather reason cannot reach 90 DEG C but higher than 50 DEG C time, then pass into variable power electricity heat storage water tank II.Internal combustion engine cylinder jacket hot water produces more than 50 DEG C hot water through water-water heat exchanger I and passes into variable power electricity heat storage water tank II.When summer operation, variable power electricity heat storage water tank I can provide driving hot water to lithium bromide refrigerator, also can provide living-hygienic hot water according to load condition, and variable power electricity heat storage water tank II only provides living-hygienic hot water.
Lithium bromide refrigerator can be more than 75 DEG C with driving hot water temperature, hot water source is variable power electricity heat storage water tank I, because the change fluctuation of refrigeration duty is larger, and more difficult prediction, therefore add storage cold water storage cistern in system and play cold water memory action, lithium bromide refrigerator chilled water passes into water-water heat exchanger II and forms the circulation of A side, and the circulation of B side is storage cold water storage cistern side.This endless form has two large advantages, the indirect refrigeration of lithium bromide chilled water, and chilled water can add particular matter, prevents lithium bromide refrigerator inside from occurring incrustation scale, reduces maintenance cost, increases its useful life; By controlling the B effluent amount of heat exchanger 2, by buffering, the memory action of storage cold water storage cistern, can ensure that lithium cold freezing water outlet temperature is 7 DEG C, inlet temperature below 12 DEG C, bromizate lithium refrigeration machine and run in efficient district.
In system cloud gray model, photovoltaic cell, wind-driven generator electromotive power output are by weather effect, and fluctuation is larger.In grid-connected situation, unnecessary electric energy can flow to electrical network, or reduces electrical network purchase of electricity, processes fairly simple.And from net situation, photovoltaic cell or output power of wind power generation can frequency, the voltages of influential system, thus affect the quality of power supply in microgrid.Mostly conventional method is to adopt change internal combustion engine generator to exert oneself, consume unnecessary electric energy with battery energy storage or direct relief arrangement.But internal combustion engine generator group is exerted oneself and had hysteresis quality, and be difficult to accurately control its power stage continuously; Frequently can affect its useful life again to accumulator cell charging and discharging; Relief arrangement then causes the waste of electric energy.Variable power electricity the adding of heat storage water tank in native system, the shortcoming in legacy system can be solved well.When electric loading is constant, system output power increases, then the electric heat storage water tank heating power of corresponding increase; System output power reduces then to reduce electric heat storage water tank electrical heating power, still can not meet system loading requirement when being reduced to zero, then regulate internal combustion engine generator group, increase its power output.In system, the power output of internal combustion engine generator group adopts " Stepped control " mode, and with X (kW) for unit, variable power electric heating heat storage water tank and storage battery play that energy is dissolved, power cushioning effect.This control strategy, not only increases system run all right, can also reduce the control difficulty of internal combustion engine generator group, greatly reduce its control frequency, increase its useful life.
During grid-connect mode, according to load and electricity price situation, also can set suitable electrical power and carry out heating water tanks energy storage, and the discharge and recharge time of setting storage battery, to improve the economy of system, play " peak load shifting " effect.
As shown in Figure 2, cogeneration pattern: refrigeration machine is out of service, system cloud gray model, in cogeneration of heat and power mode, provides domestic hot-water and heat supply in winter hot water.Variable power electricity heat storage water tank I and variable power electricity heat storage water tank II are connected, concrete connected mode is: variable power electricity heat storage water tank I top is hot water inlet, bottom connects variable power electricity heat storage water tank II top through pipeline, two tank top height basically identical (No. I water tank is slightly high), during No. I water tank full water, No. II water tank just has hot water to enter, and the use order of hot water is then hot water in preferential use No. II water tank.This two water tank series systems compare single layer-stepping heat storage water tank better heat insulation effect.The adjustment of each micro-source electrical power is identical with during summer operation.
Fig. 3 is spring and autumn operating structure figure, and system works in cogeneration pattern equally, and the connected mode of water tank is identical with Fig. 2, and co-feeding system is without heating hot water demand, and only need to provide living-hygienic hot water, fan coil does not work at spring and autumn.
Concrete control strategy is as shown in Figure 4 and Figure 5:
Definition: internal combustion engine generator electromotive power output P 1, photovoltaic electromotive power output P 2, blower fan electromotive power output P 3, variable power electricity heat storage water tank electrical power P 4, storage battery exports (input) electrical power P 5, electric loading heat outputting power P l; Generator heat outputting power Q 1, solar energy heat outputting power Q 2, system cooling and heating load heat outputting power Q l.
One, time-of-use tariffs situation is not considered
1, be incorporated into the power networks pattern
1) grid-connected online pattern:
System cloud gray model adopts " electricity determining by heat " pattern, because system configuration has heat storage water tank, internal combustion engine generator group can be made to run by heat load prediction mean value (deducting photo-thermal part).Q 1+ Q 2>Q ltime, waste heat can be stored in heat storage water tank; Q 1+ Q 2<Q ltime, not enough heat is supplemented by heat storage water tank, and still during deficiency, increasing combustion engine is exerted oneself or started heat storage water tank electric heating function.Internal combustion engine Controlling principle is, avoid frequently regulating output power of internal combustion engine, unit runs in efficient district as far as possible.Batteries does not work, and unnecessary power delivery is to power distribution network; Electric energy is supplemented by bulk power grid time not enough.
2) grid-connected pattern of not surfing the Net:
(1) P lremain unchanged, storage battery SOC≤50%, if P 2+ P 3increase Δ P, then adopt batteries to store energy; If Δ P>=1.2X, and duration T>=T set, then regulate oil-electric engine group, make its power output reduce X.When storage battery reaches capacity state, then control method is as described in (2).
(2) P lremain unchanged, storage battery SOC>50%, if P 2+ P 3increase Δ P, then corresponding adjustment heat storage water tank electrical heating power; If Δ P>=1.2X, and duration T>=T set, then regulate oil-electric engine, make its power output reduce X, residual electricity power is dissolved by electric heat storage water tank.
(3) P lremain unchanged, if P 2+ P 3reduce Δ P.Now, if P 4>0, first corresponding reduction P 4if, P 4be decreased to zero and still cannot compensate Δ P, then from electrical network power purchase P=Δ P-P 4.If P>0.8X, and duration T>=T set, P 1do not reach maximum, then P 1export and increase X, unnecessary electric energy is dissolved by electric heat storage water tank.
(4) P lincrease.First corresponding reduction P 4, P 4still cannot meet when=0, then by electrical network power purchase, purchase of electricity P=P l-P 4if, P>0.8X, and duration T>=T set, P 1do not reach maximum, then P 1increase by " Stepped control " mode, recruitment is greater than P, and unnecessary electric energy is dissolved by electric heat storage water tank.
(5) P lreduce.First corresponding increase heat storage water tank electrical power P 4, P 4during>=1.2X, and duration T>=T set, then reduce oil-electric engine group according to " Stepped control " mode and exert oneself, P 4corresponding reduction, until P 4<1.2X.
2. from network operation pattern
(1) P lremain unchanged, storage battery SOC≤60%, if P 2+ P 3increase Δ P, then adopt batteries to store energy, until storage battery is full of.Storage battery is full of rear unnecessary electric energy and is dissolved by electric heat storage water tank, if now Δ P>=1.2X, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine generator group and exert oneself, make P 4<1.2X.
(2) P lremain unchanged, storage battery SOC>60%, if P 2+ P 3increase Δ P, then corresponding increase heat storage water tank electrical heating power; If Δ P>=1.2X, and duration T>=T set, then regulate internal combustion engine generator group, make its power output reduce X, residual electricity power is dissolved by electric heat storage water tank.
(3) P lincrease or P 2+ P 3reduce Δ P.First corresponding reduction heat storage water tank electrical heating power, if Δ P>P 4, responded rapidly by batteries, supplement not enough electrical power.Adopt Stepped control method to increase internal combustion engine generator group afterwards to exert oneself, storage battery plays transitional function.If P 1exporting has been maximum, then excise load step by step by load rating principle.
(4) P lreduce.During storage battery SOC≤60%, first storage battery is charged, until be full of.After storage battery is full of, unnecessary electric energy is dissolved by electric heat storage water tank, if now Δ P>=1.2X, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine generator group and exert oneself, make P 4<1.2X.During SOC>60%, skip charge in batteries link.
Two, time-of-use tariffs situation is considered
If consideration time-of-use tariffs, during grid-connected network operation, can internal combustion engine generator group be made when electricity price is higher completely to send out, sell unnecessary electric energy to electrical network.When electricity price is lower, reduces internal combustion engine generator group and exert oneself, increase purchase of electricity, increase electric heat storage water tank power simultaneously, carry out energy storage with hot water form.To consider in system configure the life of storage battery and capacity factor, do not consider electricity price crest discharge, electricity price valley charge condition.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (10)

1. a regenerative resource cool and thermal power micro-grid system, is characterized in that, comprising: electric module and cold/thermal modules; Described electric model calling on ac bus, cold/thermal modules by heat storage water tank as energy transferring device; System can run on cold, heat and electricity triple supply operational mode or cogeneration pattern according to actual needs;
Described electric module comprises: solar power system, wind generator system, combustion gas internal combustion electricity generation system, batteries and variable power electricity heat storage water tank I and variable power electricity heat storage water tank II; Solar power system is connected incoming transport bus after DC/DC converter and DC/AC converter successively, wind generator system is connected incoming transport bus after AC/DC converter and DC/AC converter successively, the direct incoming transport bus of combustion gas internal combustion electricity generation system, batteries is incoming transport bus after two-way DC-AC converter, variable power electricity heat storage water tank is connected with ac bus, and ac bus is connected with power distribution network through PCC.
2. a kind of regenerative resource cool and thermal power micro-grid system as claimed in claim 1, it is characterized in that, described cold/thermal modules comprises: solar collector, gas internal-combustion engine, variable power electricity heat storage water tank I, variable power electricity heat storage water tank II, storage cold water storage cistern, cigarette-water-to-water heat exchanger, water-water heat exchanger I, water-water heat exchanger II, cistern and hot water lithium bromide refrigeration machine; Gas internal-combustion engine is communicated with water-water heat exchanger I respectively with cigarette-water-to-water heat exchanger, described cigarette-water-to-water heat exchanger and water-water heat exchanger I are communicated with variable power electricity heat storage water tank II with variable power electricity heat storage water tank I respectively, after described solar collector is communicated with cistern, be communicated with variable power electricity heat storage water tank II with cigarette-water-to-water heat exchanger, water-water heat exchanger I, variable power electricity heat storage water tank I respectively;
Described hot water lithium bromide refrigeration machine is communicated with variable power electricity heat storage water tank II respectively with variable power electricity heat storage water tank I, air-conditioning system is accessed after being sequentially connected in series water-water heat exchanger II, storage cold water storage cistern in described hot water lithium bromide refrigeration machine one end, and the hot water lithium bromide refrigeration machine other end is communicated with cooling tower.
3. a kind of regenerative resource cool and thermal power micro-grid system as claimed in claim 2, it is characterized in that, described lithium bromide refrigerator chilled water refluxes after water-water heat exchanger II, forms the circulation of A side; Described water-water heat exchanger II is communicated with storage cold water storage cistern, forms the circulation of B side.
4. a kind of regenerative resource cool and thermal power micro-grid system as claimed in claim 2, it is characterized in that, the driving hot water of described hot water lithium bromide refrigeration machine is provided by variable power electricity heat storage water tank I, by temperature step-down after the acting of the hot water of hot water lithium bromide refrigeration machine, pass into variable power electricity heat storage water tank II to provide living-hygienic hot water or heat temperature raising again.
5. a kind of regenerative resource cool and thermal power micro-grid system as claimed in claim 1, it is characterized in that, system cloud gray model is when cold, heat and electricity triple supply operational mode, and wind generator system and solar power system work in maximum power output state all the time; Combustion gas internal combustion electricity generation system adopts PQ to control when being incorporated into the power networks, when from network operation, by combustion gas internal combustion electricity generation system and batteries jointly for system provides electric voltage frequency to support, wherein based on combustion gas internal combustion electricity generation system, batteries plays auxiliary transitional function;
Cigarette-water-to-water heat exchanger heat outputting coolant-temperature gage is passed into heat storage water tank I storage of variable power electricity at more than design temperature A; The hot water of more than the design temperature A exported by solar collector passes into the storage of variable power electricity heat storage water tank I, and the hot water in design temperature [B, the A] scope export solar collector passes into the storage of variable power electricity heat storage water tank II; The hot water of more than design temperature B combustion gas internal combustion electricity generation system produced through water-water heat exchanger I passes into the storage of variable power electricity heat storage water tank II;
Variable power electricity heat storage water tank I provides driving hot water to lithium bromide refrigerator, provides living-hygienic hot water according to load condition simultaneously, and variable power electricity heat storage water tank II provides living-hygienic hot water.
6. a kind of regenerative resource cool and thermal power micro-grid system as claimed in claim 1, it is characterized in that, system cloud gray model is when cogeneration pattern, and lithium bromide refrigerator is out of service, and co-feeding system only provides electricity, heat two kinds of form of energy; Identical with cold, heat and electricity triple supply operational mode, wind generator system and solar power system work in maximum power output state all the time; Combustion gas internal combustion electricity generation system and adopt PQ to control under net state, under net state, by gas internal combustion electric generator group and batteries jointly for system provides electric voltage frequency to support, wherein based on internal combustion engine generator, batteries is auxiliary;
Variable power electricity heat storage water tank I top is hot water inlet, bottom connects variable power electricity heat storage water tank II top through pipeline, during variable power electricity heat storage water tank I full water, variable power electricity heat storage water tank II just has hot water to enter, and the use order of hot water is then preferentially use the hot water in variable power electricity heat storage water tank II.
7. a control method for regenerative resource cool and thermal power micro-grid system as claimed in claim 1, is characterized in that, comprising:
Grid-connected under real-time monitoring system normal operating condition and from net state, does not consider time-of-use tariffs situation,
If system is in from net state, then adopt " with the fixed heat of electricity " pattern, concrete control method is:
(1) P lremain unchanged, and during storage battery SOC≤D1, if P 2+ P 3increase Δ P, then adopt batteries to store energy, until storage battery is full of; After storage battery is full of, the electrical heating power of corresponding increase variable power electricity heat storage water tank is dissolved unnecessary electric energy, if now Δ P>=λ 1x, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine and exert oneself, make variable power electricity heat storage water tank electrical power P 4< λ 1x;
(2) P lremain unchanged, and during storage battery SOC>D1, if P 2+ P 3increase Δ P, then corresponding increase variable power electricity heat storage water tank electrical heating power; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X, residual electricity power is dissolved by variable power electricity heat storage water tank;
(3) P lincrease or P 2+ P 3when reducing Δ P, first corresponding reduction variable power electricity heat storage water tank electrical heating power, if Δ P>P 4, supplement not enough electrical power by batteries; Stepped control method increasing combustion engine is adopted to exert oneself, if internal combustion engine generator electromotive power output P afterwards 1be maximum, then excised load step by step by load rating principle;
(4) P lreduce, and during storage battery SOC≤D1, first storage battery is charged, until be full of; After storage battery is full of, the electrical heating power of corresponding increase variable power electricity heat storage water tank is dissolved unnecessary electric energy, if now Δ P>=λ 1x, and duration T>=T set, then adopt Stepped control method to reduce internal combustion engine and exert oneself, make variable power electricity heat storage water tank electrical power P 4< λ 1x;
During storage battery SOC>D1, skip charge in batteries link, unnecessary electric energy directly increases variable power electricity heat storage water tank electrical heating power;
Wherein, P 1for internal combustion engine generator electromotive power output, P 2for solar power system electromotive power output, P 3for wind generator system electromotive power output, T setfor setting-up time threshold value, D1, λ 1for set point, P lfor electric loading power, X is internal combustion engine generator group " Stepped control " power unit set point.
8. the control method of regenerative resource cool and thermal power micro-grid system as claimed in claim 7, it is characterized in that, if system is in grid-connected upper net state, system cloud gray model adopts " electricity determining by heat " pattern, because system configuration has variable power electricity heat storage water tank, combustion gas internal combustion electricity generation system is run by heat load prediction mean value; Concrete control method is:
Q 1+ Q 2>Q ltime, waste heat is stored in variable power electricity heat storage water tank; Q 1+ Q 2<Q ltime, not enough heat is supplemented by variable power electricity heat storage water tank, and still during deficiency, increasing combustion engine is exerted oneself or started variable power electricity heat storage water tank electric heating function; Batteries does not work, and unnecessary power delivery is to power distribution network; Electric energy is supplemented by bulk power grid time not enough; Wherein, Q 1for generator heat outputting power, Q 2for solar energy heat outputting power, Q lfor system cooling and heating load.
9. the control method of regenerative resource cool and thermal power micro-grid system as claimed in claim 7, is characterized in that, if system is in and does not grid-connectedly go up net state, concrete control method is:
(1) P lremain unchanged, during storage battery SOC≤D2, if P 2+ P 3increase Δ P, then adopt batteries to store energy; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X; When storage battery reaches capacity state, then residual electricity power is for increasing the heating power of variable power electricity heat storage water tank;
(2) P lremain unchanged, during storage battery SOC>D2, if P 2+ P 3increase Δ P, then increase the electrical heating power of variable power electricity heat storage water tank; If Δ P>=λ 1x, and duration T>=T set, then regulate internal combustion engine, make its power output reduce X, residual electricity power is dissolved by variable power electricity heat storage water tank;
(3) P lwhen remaining unchanged, if P 2+ P 3reduce Δ P, now, if variable power electricity heat storage water tank P 4>0, first corresponding reduction P 4if, P 4be decreased to zero and still cannot compensate Δ P, then from electrical network power purchase P=Δ P-P 4;
If P> is λ 2x, and duration T>=T set, generator electromotive power output P 1do not reach maximum, then generator electromotive power output P 1export and increase X, unnecessary electric energy is dissolved by variable power electricity heat storage water tank;
(4) P lduring increase, first corresponding reduction variable power electricity heat storage water tank P 4, P 4still cannot meet when=0, then by electrical network power purchase, purchase of electricity P=P l-P 4if, P> λ 2x, and duration T>=T set, P 1do not reach maximum, then P 1increase by Stepped control mode, recruitment is greater than P, and unnecessary electric energy is dissolved by electric heat storage water tank;
(5) P lduring reduction, first corresponding increase variable power electricity heat storage water tank P 4, P 4>=λ 1x, and duration T>=T settime, then reduce combustion gas internal combustion electricity generation system according to Stepped control mode and exert oneself, until P 4< λ 1x;
Wherein, P 1for internal combustion engine generator electromotive power output, P 2for solar power system electromotive power output, P 3for wind generator system electromotive power output, P 4for heat storage water tank electrical heating power, T setfor setting-up time threshold value, D2, λ 1, λ 2for set point, P lfor electric loading power, X is internal combustion engine generator group " Stepped control " power unit set point.
10. the control method of regenerative resource cool and thermal power micro-grid system as claimed in claim 7, is characterized in that, if consider time-of-use tariffs, when system grid connection is run, makes internal combustion engine generator group completely send out, sell unnecessary electric energy to electrical network when electricity price is higher; When electricity price is lower, reduces internal combustion engine generator group and exert oneself, increase purchase of electricity, increase electric heat storage water tank power simultaneously, carry out energy storage with hot water form.
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CN108011376A (en) * 2017-11-30 2018-05-08 国网辽宁省电力有限公司 A kind of method that control ability under the power grid state of emergency is improved based on electric heat accumulation load
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