CN106849062B - Reduce system cost based on electric energy close friend's air conditioner load side active demand method - Google Patents

Reduce system cost based on electric energy close friend's air conditioner load side active demand method Download PDF

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Publication number
CN106849062B
CN106849062B CN201710100462.4A CN201710100462A CN106849062B CN 106849062 B CN106849062 B CN 106849062B CN 201710100462 A CN201710100462 A CN 201710100462A CN 106849062 B CN106849062 B CN 106849062B
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load
power
grid
power supply
air conditioner
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CN106849062A (en
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朱建红
顾菊平
堵俊
张新松
郭晓丽
姬文亮
盛苏英
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Nantong Doctoral Innovation Technology Transfer Co ltd
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Nantong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/12—The local stationary network supplying a household or a building
    • H02J2310/14—The load or loads being home appliances
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a kind of reduction system costs based on electric energy close friend's air conditioner load side active demand strategy, DC bus side design Z-type low voltage crossing and harmonic wave prevent circuit between supply side and load side, and in nonlinear-load group's variable frequency starting, buffer current is mutated the influence to power grid；Power network monitoring is set, and under serious low voltage crossing and the other emergency Grid failure failures of power grid, emergency cut-off grid side power supply supply, hardware interlocking linkage circuit start accumulation power supply supplying DC bus passes through DC-AC inversion and powers loaded work piece；In conjunction with load prediction, battery energy storage is combined with load load shifting management, Bidirectional charging-discharging circuit between DC bus and energy-storage battery, electric energy is made full use of to carry out energy storage in the low power consumption period, peak of power consumption period energy storage release, realizes sub-load peak load shifting, guarantees that air conditioner load operates normally.The present invention efficiently solves distributed air conditioner system power-saving technology and power grid power quality contradictory problems.

Description

Reduce system cost based on electric energy close friend's air conditioner load side active demand method
The application is application number: 201510243894.1, the applying date: 2015.5.14, title " are based on electric energy close friend air-conditioning The divisional application of load side active demand strategy ".
Technical field
The present invention relates to one kind to be based on electric energy close friend air conditioner load side active demand strategy.
Background technique
The particular space needed is comfortably lived or produced to key facility of the air-conditioning as building due to that can be supplied to people Air themperature, relative humidity, cleanliness, noise or air velocity etc. are used by more and more enterprises and institutions or group, institute To there is the at full speed soaring of air-conditioning configuration quantity with Chinese the earth building body completion.The increasingly huge meaning of air-conditioning quantity Taste the continuous promotion of energy for building demand.To respond energy saving policy, many air-conditioning producers are proposed convertible frequency air-conditioner, but energy saving Convertible frequency air-conditioner largely access power grid and can cause a large amount of harmonic waves to power grid again, influence the normal operation of other equipment, also influence electricity It can quality.Higher hamonic wave false triggering turn on thyristors, it is out of control to also result in system caused by converting operation.Therefore, following electricity Net side or load side design corresponding harmonic wave active suppression circuit, with realize power grid friendly load target especially it is necessary to.
Peak load is idle, and deficiency will cause collapse of voltage, even results in whole system and disintegrates.This undoubtedly gives normal society The daily life of meeting economic order and the people brings strong influence, in the situation that current electricity supply and demand contradiction is very prominent Under, how friendly electricity consumption, improve the operational efficiency of central air conditioning cooling water system, chilled water system and entire air-conditioner host, drop Its low energy consumption is the task of top priority, and novel high-efficiency energy-saving air conditioning system has become the top priority of air conditioning field exploitation.State Central air conditioner system maximum load capability as defined in family's standard is set according to the local highest temperature, peak load working environment Meter, and the time of central air-conditioning 98% is fluctuated up and down in 70% load, so there are larger surpluses for system operation control design case. Preferably to realize energy conservation and comfortable function target, reducing to the greatest extent influences grid power quality, these all be unable to do without the control of science System and Low Dropout prevention and treatment and harmonic wave control technology.Someone forms the change of harmonic wave and to largely causing network voltage to distort Fast air-conditioning (VSAC) statistical analysis shows that convertible frequency air-conditioner is that the country causes one of large-scale load of voltage distortion.
With the fast development of extensive interconnected network, the fluctuations energy such as wind-powered electricity generation, solar energy it is extensive access and The fragility of the rapid growth of all kinds of electric loads, traditional power grid increasingly highlights, the air conditioner load high proportion of peak period summer, In addition being born the investments of more air cleaning new products with haze weather, power grid unstability certainly will be aggravated, increase power grid Burden.On the basis of considering load operation functional requirement specificity analysis, load energy-saving run electric energy close friend's Scheduling Design is carried out, it is suitable National current energy-saving and emission-reduction slogan is answered, there is positive effect.
Summary of the invention
The purpose of the present invention is to provide a kind of solution distributed air conditioner system power-saving technologies and power grid power quality Contradictory problems based on electric energy close friend's air conditioner load side active demand strategy.
The technical solution of the invention is as follows:
One kind being based on electric energy close friend air conditioner load side active demand strategy,
DC bus side design Z-type low voltage crossing and harmonic wave prevent circuit between step 1. supply side and load side, Buffer current is mutated the influence to power grid when nonlinear-load group's variable frequency starting.Be arranged power network monitoring, serious low voltage crossing and Under the other emergency Grid failure failures of power grid, the supply of emergency cut-off grid side power supply, hardware interlocking linkage circuit start energy storage electricity Source supplying DC bus passes through DC-AC inversion power supply loaded work piece.It combines closely load prediction, battery energy storage is avoided the peak hour with load Management combines, Bidirectional charging-discharging circuit between DC bus and energy-storage battery, the low power consumption period make full use of electric energy into Row energy storage, peak of power consumption period energy storage release, realizes sub-load peak load shifting, guarantees that air conditioner load operates normally.Work as electricity consumption Peak battery charge state is not enough to that load is maintained to operate normally, while room temperature and humidity detection are certain in human body fitness When in range, in conjunction with central air conditioner system Cooling and Heat Source play a role or recession in terms of existing time delay characteristic, temporarily adopt Suspend strategy with air-conditioning system equipment.
Step 2. one kind according to step 1 is based on electric energy close friend air conditioner load side active demand strategy, battery charging and discharging The control and management of behavior are it is characterized by: battery energy storage device BESS (energy storage battery system) the SOC(battery charge shape State) management using factory experimental data combined with real time monitoring data.It is carried out using following steps:
Step 2-1. provides empirical curve using producer and combines with real time on-line monitoring sampled data, to charging and discharging currents Integral calculation is carried out, in conjunction with charging-discharging cycle and previous measured data, the variation of dynamic corrections charging and discharging curve obtains current dynamic State-of-charge variation tendency accurately carries out battery remaining power dynamic prediction and real time measure as far as possible.
Step 2-2. bi-directional DC-DC controller design, since energy-storage battery serves as network load and air conditioner load in system The two-sided role of power supply is related to power current and frequently flows into and out, selects bi-directional DC-DC control circuit.
Step 3. is a kind of to be based on electric energy close friend air conditioner load side active demand strategy, and wherein harmonic management uses hardware device Part circuit is combined with software programming, is included the following steps:
The filter circuit of certain harmonic order, direct current are arranged in the grid side of converter and DC bus side by step 3-1. Bus bar side installs super capacitor additional and absorbs higher hamonic wave, inhibits voltage fluctuation, and the fractional harmonic for receiving two sides to join herein avoids spreading out Raw new harmonic frequency；Can be filtered off again by applying filtering link between converter and load as RLC passive filter by one Divide high-frequency harmonic.
Step 3-2. considers that the filtering device needed is various, and the frequency range of the harmonic wave of elimination is not only with passive filter Completely, surcharge is high, and speed is slow, and energy consumption is high, introduces high power active filter on the basis of simple passive filtering.In conjunction with prison The Current Voltage for surveying load end, the parameter value come out with power end phaselocked loop are compared, and are disappeared by adjusting the PWM of converter Except low-frequency harmonics.
A kind of doubly-fed wind turbine system of the present invention compared with the prior art by using the above technical solution, have with Lower technical effect:
(1) consider that the entire network load of air conditioner load accounting is higher, run the period compares concentration, gets over to electrical network capacity demand Carry out more high demand characteristics.Novelty introduces energy-storage battery, and in power load peak time, it is negative as air-conditioning to cut energy-storage system Charged source, peak clipping tune paddy, is actively engaged in dispatching of power netwoks.
(2) air conditioner load whole year utilization rate is not high, female in energy-storage system and converter direct current from cost performance optimal angle Innovative design bi-directional DC-DC charge-discharge circuit between line.Reduction system design cost reduces controller occupied space size.
(3) harmonic wave generated for energy-saving frequency conversion operation, it is comprehensive to use fixed filter circuit and insertion intelligent control technology, The Z-type circuit that can be eliminated fractional harmonic and inhibit low voltage crossing is introduced at DC bus, large bulk capacitance preferably avoids becoming The harmonic source of parallel operation two sides interacts, and prevention expedites the emergence of new harmonic wave type, while preventing grid voltage sags and causing to load Adverse effect.Simple filter circuit filters off higher hamonic wave.Intelligent control is combined closely load side Detecting Power Harmonicies, and it is humorous to filter out low order Wave.
(4) the energy-storage battery service life is efficiently used, with optimization Collaborative Control and scheduling strategy, friendly electricity consumption is realized, reaches Effectively energy conservation.
Detailed description of the invention
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples:
Fig. 1 is that one kind that the present invention designs is based on the connection control of electric energy close friend air conditioner load side active demand strategy functional module Schematic diagram processed；
Fig. 2 is a kind of functional module scheduling based on electric energy close friend's air conditioner load side active demand strategy that the present invention designs Schematic diagram；
Fig. 3 is a kind of hardware configuration signal based on electric energy close friend's air conditioner load side active demand strategy that the present invention designs Figure；
Fig. 4 is that one kind that the present invention designs is based on the electric energy close friend air conditioner load side active demand strategy frequency conversion of being solved control Feeder line harmonic wave schematic diagram processed.
Specific embodiment
Embodiment 1:
As shown in Figure 1, the present invention devises one kind based on electric energy close friend air conditioner load side active demand strategy, use hard Part includes: grid interface module, peak load shifting control module, comfort level and energy-saving control module.
Step 1, DC bus side design Z-type low voltage crossing and harmonic wave prevent circuit between supply side and load side, Buffer current is mutated the influence to power grid when nonlinear-load group's variable frequency starting.
Power network monitoring is arranged in step 2, under serious low voltage crossing and the other emergency Grid failure failures of power grid, promptly cuts The supply of net side power supply is powered off, hardware interlocking linkage circuit start accumulation power supply supplying DC bus is powered negative by DC-AC inversion Carry work.
Step 3, load prediction of combining closely, battery energy storage are combined with load load shifting management, DC bus and energy storage electricity Bidirectional charging-discharging circuit between pond makes full use of electric energy to carry out energy storage in the low power consumption period, and the energy storage of peak of power consumption period discharges, It realizes sub-load peak load shifting, guarantees that air conditioner load operates normally.When peak of power consumption battery charge state is not enough to remain negative Lotus operates normally, while when room temperature and humidity detection are in human body fitness a certain range, existing in conjunction with central air conditioner system Cooling and Heat Source play a role or subside aspect existing for time delay characteristic, temporarily using air-conditioning system equipment pause strategy.
Embodiment 1:
As electric energy close friend's air conditioner load side active demand strategy hardware device embodiment of specific embodiment one, such as Shown in Fig. 2, specifically include:
Harmonic management and low voltage crossing circuit design
Air conditioner load uses energy-saving and frequency-variable operation adjusting meaning, between power grid and frequency conversion system and frequency conversion system and load LC filter circuit is designed, a part of high-frequency harmonic is filtered off, intermediate dc bus designs Z-type circuit mainly for prevention low-voltage is worn More equipment is influenced, a part of harmonic wave can be filtered off again as filter circuit.By being designed at harmonic wave between supply side and load side Reason and low voltage crossing prevent circuit, influence when avoiding nonlinear-load variable frequency starting and working to power grid.
Accumulator access design under serious low voltage crossing and the other emergencies of power grid
Energy-storage battery technology is constantly progressive, and capacity is also higher and higher, and it is distributed that energy is fully able to supply middle low power The peak period power demand of air conditioner load, system design electric network fault monitoring of combining closely, and supply in air conditioner load system power supply Energy-storage battery is flexibly cut in answering, for controlling DC bus end voltage, designs reasonable Bidirectional charging-discharging circuit, is buffered a large amount of empty It adjusts and runs pressure of powering caused by power grid in concentrative time interval.When system detection substantially falls peak of power consumption to voltage, promptly The supply of grid side power supply is cut off, hardware interlocking linkage circuit start accumulation power supply supplying DC bus is powered by DC-AC inversion Loaded work piece.Energy storage side power supply is cut in time, and air conditioner load is maintained reliably to operate normally, and reduces load side equipment damage.
Battery energy storage and load load shifting management design
It combines closely load prediction, introduces energy-storage battery, make full use of electric energy to carry out energy storage, electricity consumption in the low power consumption period Peak period energy storage release, realizes network load peak load shifting, and load is maintained to operate normally.When peak of power consumption battery charge state It is not enough to that load is maintained to operate normally, while when room temperature and humidity detection are in human body fitness a certain range, due to centre Air-conditioning system generates cooling capacity from refrigeration machine and plays a role to end is sent to, or shuts down to indoor Cooling and Heat Source and release energy completely Recession has delay in 20-30 minutes, can be temporarily using air-conditioning system equipment pause strategy, and energy-storage system is according to power network monitoring situation Interruption charging.
Bi-directional DC-DC controller design
Since energy-storage battery serves as the two-sided role of network load and air conditioner power source in system, be related to power frequently flow into and Outflow needs two converters, increases design cost, also increase if system selects unidirectional power stream DC-DC converter Device spatial volume, therefore, project consider the not high factor of air conditioner load whole year utilization rate, from cost performance optimal angle, select Bi-directional DC-DC control circuit.
Embodiment 3:
Such as Fig. 2, shown in Fig. 3, electric energy close friend air conditioner load side active demand strategy function is based on as one kind of the invention Module schedules strategy schematic diagram.It is combined using power grid close friend's load hardware circuit design with insertion programming technique, battery energy storage System operates in timing must combine closely electric network state monitoring signals and Air-conditioning Load Prediction signal, a total optimization Scheduler module can coordinate each submodule operation of whole system.Specific step is as follows for implementation:
Step 1, according to load prediction, when detection has starting to require, current electric grid load condition is detected, judges whether to locate In the demand peak period；
Step 2, if it is peak period, preferred energy storage for power supply, load off-grid operation tests state-of-charge at the same time, Judge state-of-charge situation.If not peak period, judge whether low power consumption, using the energy storage of low power consumption period, until Chu Manwei load peak period arrives and prepares.If not peak nor low ebb, the grid-connected normal operation of load.When grid-connected fortune The row moment pays close attention to electrical network low voltage and grid fault conditions；
Step 3, when energy-storage battery power consumption to state-of-charge, which is not enough to continue power supply, maintains load operation, power grid no-voltage Fall or when electric network fault, load is incorporated into the power networks.If power grid has Voltage Drop or electric network fault, the of short duration shutdown 20- of load 30 minutes；
Step 4, harmonic wave situation is monitored, with program parameter dynamic corrections, hardware circuit is removed and fails the harmonic wave of processing, then return Return load prediction.
Fig. 4 is briefly described a kind of based on air-conditioning Load harmonic situation in electric energy close friend air conditioner load side active demand strategy. Convertible frequency air-conditioner absorbs idle little in electric network fault, and harmonic wave caused by convertible frequency air-conditioner operation is very important, and frequency conversion is empty Adjusting the input side due to frequency converter is commutating circuit, has nonlinear characteristic, and the higher hamonic wave of generation makes current source or voltage source Waveform is distorted.I is compared on feeder line in figure0Input terminal starting point ii, it is distorted, meanwhile, frequency converter output circuit is Control circuit for pulse-width modulation makes the voltage and current of output also generate higher hamonic wave.
The present invention by adopting the above technical scheme, has the advantages that
1. network load operation demand peak period, energy storage flexible access maintain air conditioner load reliably to operate normally, avoid Load side equipment damage；It buffers and runs pressure of powering caused by power grid in a large amount of air-conditioning concentrative time intervals.
2. utilizing the low-valley interval energy storage of network load demand, demand peaks discharge energy storage, play the role of peak clipping tune paddy.
3. harmonic wave combines mode, this method and the method for depending merely on passive filter elimination fractional harmonic using software and hardware It compares, it is clear that directly carry out harmonic management better effect in source, direct current component is connected to Z-type lc circuit, while also promoting circuit Resist the ability of voltage instantaneous fluctuation.Generally speaking, RLC filter circuit omits higher hamonic wave, and advanced insertion controller can be eliminated Low-order harmonic.
4. accessing bi-directional DC-DC control circuit between energy-storage system and current transformer DC bus, cost is saved, improves sexual valence Than.

Claims (1)

1. it is a kind of reduce system cost based on electric energy close friend's air conditioner load side active demand method, it is characterized in that: use firmly Part includes: grid interface module, peak load shifting control module, comfort level and energy-saving control module；Using the step of include:
Step 1, DC bus side design Z-type low voltage crossing and harmonic wave prevent circuit between supply side and load side, non-thread Property load group variable frequency starting when buffer current be mutated influence to power grid；
Power network monitoring, under serious low voltage crossing and the other emergency Grid failures of power grid, emergency cut-off grid side is arranged in step 2 Power supply supply, hardware interlocking linkage circuit start accumulation power supply supplying DC bus pass through DC-AC inversion power supply loaded work piece；
Step 3, in conjunction with load prediction, accumulation power supply is combined with load load shifting management, is set between DC bus and accumulation power supply There is Bidirectional charging-discharging circuit, makes full use of accumulation power supply to carry out energy storage in the low power consumption period, the energy storage of peak of power consumption period discharges, It realizes sub-load peak load shifting, guarantees that air conditioner load operates normally；When peak of power consumption accumulation power supply state-of-charge is not enough to tie up Load normal operation is held, while when room temperature and humidity detection are in human body fitness a certain range, in conjunction with central air-conditioning system System Cooling and Heat Source play a role or recessions in terms of existing time delay characteristic, it is temporarily tactful using the pause of air-conditioning system equipment；
Grid interface module is the design LC filter circuit between power grid and frequency conversion system and frequency conversion system and load, filters off one Divide high-frequency harmonic, intermediate dc bus prevents circuit using Z-type low voltage crossing and harmonic wave, prevents low voltage crossing to equipment shadow It rings, a part of harmonic wave can be filtered off again as filter circuit；By designing Z-type low voltage crossing and humorous between supply side and load side Wave prevents circuit, influence when avoiding nonlinear-load variable frequency starting and working to power grid；
Peak load shifting control module flexibly cuts energy-storage battery in the supply of air conditioner load system power supply, for controlling DC bus Voltage is held, using Bidirectional charging-discharging circuit, buffers and runs pressure of powering caused by power grid in a large amount of air-conditioning concentrative time intervals；When being When system detects that voltage substantially falls peak of power consumption, the supply of emergency cut-off grid side power supply, the storage of hardware interlocking linkage circuit start Energy power supply power supply DC bus passes through DC-AC inversion power supply loaded work piece；Accumulation power supply is cut in time, maintains air conditioner load can By operating normally, load side equipment damage is reduced.
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CN201710100462.4A CN106849062B (en) 2015-05-14 2015-05-14 Reduce system cost based on electric energy close friend's air conditioner load side active demand method
CN201510243894.1A CN104807143B (en) 2015-05-14 2015-05-14 Electric-energy-friendly-based air conditioner load side active demand strategy

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