CN106803672A - The energy source router and control strategy of family type energy LAN - Google Patents
The energy source router and control strategy of family type energy LAN Download PDFInfo
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- CN106803672A CN106803672A CN201611113258.8A CN201611113258A CN106803672A CN 106803672 A CN106803672 A CN 106803672A CN 201611113258 A CN201611113258 A CN 201611113258A CN 106803672 A CN106803672 A CN 106803672A
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Classifications
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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
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- H02J3/005—
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- H02J3/382—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of energy source router of family type energy LAN,Including controller,Solid-state transformer and multiple interfaces,Interface connects the distributed power source in major network and home energy source LAN respectively,Energy storage device and load,Controller adjusts the voltage of solid-state transformer,Solid-state transformer is bi-directional configuration,Including the input stage high pressure three-phase rectifier being sequentially connected,Isolation level DC/DC converters and output stage low voltage three-phase inverter,DC/DC converters are bidirectionally symmetric structure,Including single-phase full bridge inverter circuit,High frequency transformer and unidirectional bridge-type all controlled rectifier circuit,The high voltage direct current inversion of major network is high frequency square wave by single-phase full bridge inverter circuit,Then realize that secondary is depressured by high frequency transformer,Exported to low-voltage direct bus through unidirectional bridge-type all controlled rectifier circuit again,Low-voltage direct bus connects home energy source LAN by low voltage three-phase inverter.Compared with prior art, present invention optimizes energy source configuration, flow of electrical power is enriched, is had a good application prospect.
Description
Technical field
The present invention relates to a kind of energy source router towards energy internet, more particularly, to a kind of family type energy local
The energy source router and control strategy of net.
Background technology
The increasingly depleted of fossil energy, the rapid deterioration of global environment, the drastically change of world climate and power electronics
With the fast development of computer information technology, greatly developed regenerative resource, such as wind energy, solar energy, tide energy.For
Improve the utilization rate of regenerative resource, distributed generation technology, micro-capacitance sensor based on converters in maximum ground
Technology, intelligent power grid technology etc. have obtained further investigation and extensive use, the regenerative resource master following by human society is turned into
Physical efficiency source.The energy demand of rapid growth can not be met because of the fossil energy that amount of storage is persistently reduced again, tradition is with fossil energy
Source no longer adapts to the development of society for the global energy structure of main body.In order to give full play to the utilization potential of regenerative resource, carry
All types of user high participates in the ability of market regulation, and a kind of new energy resource structure is arisen at the historic moment, i.e. energy internet (energy
internet)。
Home energy source LAN (residential energy local network, RELN) is used as energy internet
A kind of inscape, its quantity is more, and distribution is wide, possesses the characteristic feature of energy LAN system, therefore to home energy source local
The research of net is very necessary.
As energy source in energy internet and the hinge-energy source router (energy router, ER) changed,
Focus as scholars' research.ER has the characteristics that as the nucleus equipment of energy internet：1) it can not only be real
Existing transformation function, additionally provides the standard interface of various electrical energy forms, can realize including each including distributed power generation unit
Plant the access of AC and DC power equipment；2) real-time control can be carried out to the voltage x current of each port, realizes energy management, trend
The power network demands such as scheduling；3) dynamic characteristic is good, with reply short trouble, completes the functions such as low-voltage crossing；4) can be easily complete
Into the collection of electric network data, for the operation reserve of energy internet in larger scope provides big data foundation.
The core of energy source router is solid-state transformer (solid state transformer, SST), and it is that one kind will
Technics of Power Electronic Conversion technology and the high-frequency electrical energy converter technique based on electromagnetic induction principle are combined, and realize a kind of electrical nature
Electric energy be changed into another electrical nature electric energy static electrical equipment.Because employing the power electronics device of medium-high frequency
Part, therefore the volume and weight of transformer can be reduced with high degree.And functionally except traditional power network transformation can be realized
Outside the basic function that device is isolated for electric energy, changes, transmitted, the voltage x current of input and output can also be adjusted, improved
The quality of power supply；Electric power electric transformer can also have the functions such as Autonomous test, self diagnosis, self-shield and combined network communication concurrently simultaneously.
Due to the intermittent and fluctuation feature of the regenerative resource itself of home energy source LAN, make distributed type renewable
Harmonic Control between the energy, energy storage and load becomes most important.The solution of this problem helps to realize home energy source
High-quality electric energy is accessible shared in LAN, it helps achieve the real-time power letter between home energy source LAN and major network
Breath is exchanged, so as to ensure the safe and stable operation of major network and home energy source LAN.
The content of the invention
The purpose of the present invention is exactly that providing one kind makes the family type energy for the defect that overcomes above-mentioned prior art to exist
LAN coordinates the energy source router and control strategy of control, optimization energy source configuration with major network.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of energy source router of family type energy LAN, including controller, solid-state transformer and multiple interfaces, it is described
Interface connect distributed power source in major network and home energy source LAN, energy storage device and load, described controller respectively
The oriented flowing of electric current between the voltage of solid-state transformer is adjusted to realize each interface, described solid-state transformer is bi-directional configuration,
Including the high pressure three-phase rectifier, DC/DC converters and the low voltage three-phase inverter that are sequentially connected, described DC/DC converters are
Bidirectionally symmetric structure, including single-phase full bridge inverter circuit, high frequency transformer and unidirectional bridge-type all controlled rectifier circuit, described is single-phase
The high voltage direct current inversion of major network is high frequency square wave by full bridge inverter, then realizes that secondary is depressured by high frequency transformer,
Exported to low-voltage direct bus through unidirectional bridge-type all controlled rectifier circuit again, low-voltage direct bus is connected by low voltage three-phase inverter
Home energy source LAN, realizes that inversion, rectification, without phase angle difference control, reduce high frequency transformer loss.
Distributed power source includes wind-driven generator, photovoltaic generator, and being accessed by plug and play interface can source router.
The mode of operation of the energy source router of described family type energy LAN is divided into grid-connect mode and off-network pattern.
Described grid-connect mode includes：
Energy supply model, distributed power source works in MPPT modes, the total generated output P of distributed power sourceDGIt is negative more than total
Lotus power Pload, unnecessary electric energy through can source router inversion export the power conveyed to major network to major network, home energy source LAN
PgridFor：
Pgrid=PDG-Pload；
User under this pattern in the net of Bureau of Energy of family domain can regard the producer of electric energy as, and unnecessary electric energy is reversely sold
To major network, to obtain maximum benefit.
Energy expenditure pattern, distributed power source works in MPPT modes, the total generated output P of distributed power sourceDGIt is negative less than total
Lotus power Pload, major network provides the electric energy of insufficient section to home energy source LAN, and major network conveys to home energy source LAN
Power P 'gridFor：
P′grid=Pload-PDG。
User under this pattern in the net of Bureau of Energy of family domain can regard the consumer of electric energy as.
Described off-network pattern includes：
Distributed power source MPPT operational modes, distributed power source works in MPPT modes, and new energy, energy storage are utilized with maximum
Device maintains the constant of DC bus-bar voltage by discharge and recharge, and the power of energy storage device is：
Pstorage=Pload-PDG
In this mode, if energy storage device discharge power reaches limit value, distributed power generation is less than total load power, one
The non-key load in part is removed to maintain the constant of DC bus-bar voltage；
Distributed power source downrating pattern, after energy storage device electricity reaches threshold limit value, distributed power source drop power
Operation, total generated output is equal to total load power, maintains constant, the P of DC bus-bar voltageDG=Pload。
A kind of control strategy of described energy source router, including solid-state transformer input stage control strategy, specially：Adopt
With Double closed-loop of voltage and current high pressure three-phase rectifier, it is 0 to make q shaft currents reference value, realizes unit input power factor.
Described control strategy also includes solid-state transformer intergrade control strategy, specially：PWM controls are respectively adopted
Single-phase full bridge inverter circuit and unidirectional bridge-type all controlled rectifier circuit in DC/DC converters, the PWM of single-phase full bridge inverter circuit are touched
There is phase shift angular difference δ in hair pulse, now DC/DC converters transmission work(with the PWM trigger pulses of unidirectional bridge-type all controlled rectifier circuit
Rate P0Meet following formula：
Wherein, UdcFor high-pressure side exports DC voltage, Udc-lowFor low-pressure side exports DC bus-bar voltage, L is high frequency transformation
The leakage inductance of device, fHIt is switching frequency.The control targe of intermediate isolating level is the constant low-voltage direct of output, from above formula,
Transimission power is certain, and high side voltage value is constant, in the case that leakage inductance and switching frequency are set, by controlling phase shifting angle
δ, you can control low-pressure side output DC voltage.Control device is PI controls.Understand simultaneously, work as δ>Energy forward flow when 0, i.e.,
Electric energy flows to home energy source LAN from power network, works as δ<Energy back flowing, i.e. electric energy flow into electricity from home energy source LAN when 0
Net, realizes the two-way flow of energy.
Compared with prior art, the present invention has advantages below：
(1) electric energy from different regenerative resources injects low-voltage direct bus by corresponding converter, can realize
The complementation of wind-light-between storage and major network.This can effectively reduce the challenge brought to power network by renewable energy power generation randomness,
The production and consumption of local electric energy are realized, and improves new energy power output.
(2) plug and play：Standardized plug and play interface, can quickly recognize that the access of different electrical characteristics sets
Standby, the pusher side unsteady flow side joint using burning natural gas distributed power apparatus enters, and cutting-in control is unified by energy source router, flexibly tackles different electricity
Pressure grade, the access of the distribution apparatus of different frequency, it is flexible and convenient to use.
(3) amphicheirality：User terminal both can be the user of consumed energy for power network, it is also possible to be to provide the electricity of energy
Source.Two-way topology design can realize the two-way flow of electric energy, be more beneficial for realizing that user benefit is maximized.
(4) hardware topology of energy source router easily extends because of modularization：Designed energy source router just uses mould
Blockization is designed, and each module completes specific function.The solid-state transformer module of energy source router can realize low-voltage direct bus
Modularization access.Such as tide energy, biomass energy can be accessed by the system module for extending can source router.
(5) exact load classification：Load is accessed by corresponding DC interface, three-phase or single phase interface respectively can source routing
Device.Can the electric energy interface module of source router various alternative electric energy interfaces will be provided, including direct current 600V, direct current 48V,
Three-phase alternating current 380V, single phase ac 220V etc..Each port will be provided with the single-phase or multidirectional energy of flow of energy as needed simultaneously
The alternating current-direct current load interface and distributed power source access interface of power, such as unidirectional power stream, the distributed energy storage of bidirectional power flow set
Standby access interface etc., the precise classification to load is realized with this.
(6) by isolation and non-isolated, two-way DC/DC can be divided into not isolated form (Buck-Boost, Buck/Boost Cuk,
) and two kinds of isolated form Sepic-Zeta.Because there is no electrical isolation between the input of isolation type bidirectional DC/DC and output, while
It is required that the no-load voltage ratio between input voltage and output voltage can not be too big, and shape between the input of isolation type bidirectional DC/DC and output
Into electrical isolation, and the voltage change ratio of input and output voltage is flexible, therefore the intergrade of solid-state transformer is generally using isolation
The two-way DC/DC topological structures of type.
By topological structure, two-way DC/DC can be divided into double inverse-excitation type, double positive activation types, double-push-pull type, double half-bridges, bridges five of enjoying a double blessing
Kind.Because full-bridge topology has：The positive and negative alternation of transformer flux, iron core utilization is high；Output voltage ripple frequency is switching frequency
Twice, output inductor and electric capacity are smaller；The advantages of suitable for high-power output device, thus solid-state transformer centre
Level uses bidirectional bridge type DC/DC topological structures.
Therefore it is the solid-state transformer of isolation type bidirectional bridge-type DC/DC topological structures that the present invention uses intergrade.
(7) solid-state transformer input stage is a high-voltage rectifier.Conventional diode uncontrollable rectifier or Thyristor Controlled are whole
Stream can transmit a large amount of harmonic waves and idle to power network, and solution is to realize current on line side control by full-control type converter device,
Net side can be made to keep unity power factor to run under appropriate control strategy.The voltage and current double closed-loop decoupling control that the present invention is used
System strategy, the effect of outer voltage is to maintain the stabilization that HVDC exports voltage, and the effect of current inner loop is to realize specific work
Rate factor correcting, it is ensured that current on line side and voltage in phase, while reducing the harmonic content of current on line side.
(8) control of solid-state transformer intermediate isolating level has four kinds of methods：It is full-bridge inverting and uncontrollable rectifier control mode, complete
Bridge inversion and synchronous rectification control mode, single phase-shift control mode, double phase-shift control modes.In these four control modes, first
Plant control mode controllability too poor；Full-bridge inverting can flexibly control energy in bidirectional flow with synchronous rectification control mode, it is easy to
Sofe Switch is realized, but there is circulation problem；Two-track phase control can eliminate circulation, but need to meet stringent condition, range of regulation
It is narrower.The control of solid-state transformer intermediate isolating level of the present invention can overcome disadvantage mentioned above, controllability using single phase-shift control mode
By force, acyclic flow problem, adjustable range are wide.
Brief description of the drawings
Fig. 1 is the basic framework of the present embodiment home energy source LAN；
Fig. 2 is the overall architecture of the present embodiment energy source router；
Fig. 3 is the typical circuit topology of the present embodiment SST；
Fig. 4 is the topological structure of the present embodiment energy source router；
Fig. 5 (a) is the present embodiment three phase rectifier unit topological structure；5 (b) is the present embodiment three phase rectifier unit controller chassis
Figure；
Fig. 6 (a) is the present embodiment DC/DC converter unit topological structures；6 (b) is DC/DC units control in the middle of the present embodiment
Block diagram；C () is the present embodiment DC/DC converter phase shifting control oscillograms；
Fig. 7 (a) is the present embodiment three-phase inversion unit topological structure；7 (b) is that the present embodiment three-phase exports inversion unit control
Block diagram processed；
Fig. 8 is the present embodiment MPPT control block diagrams；
Fig. 9 is the present embodiment three-phase input voltage waveform；
Figure 10 is the present embodiment input stage net side A phase voltage current waveforms；
Figure 11 is the present embodiment input stage DC voltage waveform；
Figure 12 is the present embodiment isolating transformer original edge voltage；
Figure 13 is the present embodiment isolating transformer secondary voltage；
Figure 14 is the present embodiment SST isolation level output voltages；
Figure 15 is the present embodiment SST output stage floating voltages；
A phase output voltage current waveforms when Figure 16 is the present embodiment resistive load.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed implementation method and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
The present invention with it is a kind of based on can source router home energy source LAN as research object, by photovoltaic, wind-power electricity generation
Etc. can be formed with this during distributed power source, energy storage device and load etc. access home energy source LAN by the distinct interface of ER
Operation mode is coordinated in the source-net-lotus of home energy source LAN-storage.Because of the energy flow between home energy source LAN and major network
Be it is two-way, and regenerative resource itself intermittent and fluctuation feature, make distribution type renewable energy, energy storage and load
Between Harmonic Control become most important.The solution of this problem helps to realize high-quality electricity in home energy source LAN
The accessible of energy is shared, it helps achieve the real-time power information between home energy source LAN and major network is exchanged, so as to ensure
The safe and stable operation of major network and home energy source LAN.
1. home energy source LAN source-net-lotus-storage operation mode
Home energy source LAN is the micro- energy net being made up of power supply, distributed energy, energy-storage travelling wave tube, load etc.,
The important composition form of energy internet, with it is efficient, safe, controllable the characteristics of.By applying advanced Power Electronic Technique,
Research and development high efficiency energy source router, its conversion efficiency better than traditional transformer and can the various powers of alterating and direct current of flexible access or bear
Carry, realize plug and play；User side thermoelectric cold cogeneration, ice-reserving cold-storage, dispersion energy-storage travelling wave tube extensive use；User side burdened resource
Demand response, response Spot Price are participated in, various loads are flexibly controllable.
The basic framework of 1.1 home energy source locals
Home energy source LAN includes distribution type renewable energy generating (such as blower fan, photovoltaic) equipment, distributed controllable hair
Electric equipment (such as microgenerator), energy-storage system (such as battery energy storage) and electric automobile, various intelligent load (critical loads,
Controllable load, schedulable load) etc., they are respectively connected to the distinct interface of energy source router.Therefore home energy source LAN can
To regard as by the network of the close-coupleds such as power network, the electrified network of communication lines, natural gas grid, information communication network, wherein, electricity
The hinge that power net is mutually converted as the various energy, is the base support of home energy source LAN.Power network and electrified traffic
Interaction is realized in the discharge and recharge that electric automobile is crossed by Netcom, can be with bi-directional conversion between two kinds of energy of electric power and natural gas.Home energy source
The basic framework of LAN is as shown in Figure 1.
RELN has merged substantial amounts of distribution type renewable energy, distributed energy storage by energy source interface and energy source router,
And the distribution of combined with intelligent energy and administrative skill, the target of common completion system optimum control, so that it is guaranteed that distributed apparatus are pacified
Entirely, access RELN reliable, efficiently, economic, intelligent and control of the realization to energy stream and information flow.Electric energy is energy internet
In main energy carrier and transmission intermediary, electric energy transmission and distribution are the main contents of present invention research.
Energy source router is the key equipment in home energy source LAN, and it can realize that the information between major network and RELN is handed over
Change shared with energy, all energy that it is distributed in a kind of unified mode, managed, dispatched in RELN, and in TOCOM total communication
On the basis of allocation optimum is carried out to energy.
Energy source router is a kind of switching equipment of the energy-information integral, and its overall architecture is as shown in Fig. 2 by scheming
Understand, entirely energy source router is made up of communications platform, 3 main functional modules of controller and solid-state transformer, communication unit
Information transmission is realized by UART serial links between controller；Control module focuses on realizing that microgrid is interior and between microgrid
The energy is dispensed；Solid-state transformer realizes the oriented stream of electric current between each interface by voltage-regulation under the support of controller information
It is dynamic, it is ensured that the equilibrium of supply and demand of electric power；Collaboration that can be between source router places one's entire reliance upon communication network, and develops special logical
Letter agreement DNP3.
The nucleus module of energy source router is solid-state transformer, and its typical circuit topological structure is as shown in Figure 3.Solid-state becomes
In the depressor course of work, the high pressure industrial-frequency alternating current that be input into for power network by high pressure three-phase rectifier is turned by AC/DC rectifier converters
Change DC high-voltage into, and maintain input current sinusoidal waveform and synchronous with input voltage holding, to obtain unit input power
Factor, realizes reactive power compensation, while maintaining input rectifying unit DC voltage constant；DC/DC converters are in structure
By DC/AC modules, high frequency transformer and AC/DC module compositions, high voltage direct current inversion is converted into high frequency square wave and by height
Frequency power transformer realizes that secondary is depressured, then exports low-voltage DC by AC/DC rectification modules, and maintains low-voltage direct busbar voltage permanent
It is fixed, realize that inversion, rectification, without phase angle difference control, reduce high frequency transformer loss.
Operation mode is coordinated in 1.2 home energy source LAN source-net-lotus-storages
Power system " source-net-lotus-storage " operation mode refers to power supply, power network, load and the part of energy storage four by various friendships
Mutual means, power dynamic equilibrium ability that is more economical, efficiently and safely improving power system, so as to realize that energy resources are maximum
Operational mode and technology that change is utilized.And under energy Background of Internet, " source-net-lotus-storage " coordination optimization has deeper level
Implication.Mainly include following 2 aspects：
1) horizontal multi-source is complementary." horizontal multi-source is complementary " in energy internet refers to power system, petroleum system, heat supply
Complementary coordination between the various energy resources resources such as system, natural gas supply system, highlights alternative between all kinds of energy
Property, user not only can arbitrarily select different energy sources wherein, also can unrestricted choice energy resources take mode.
2) longitudinal direction " source-net-lotus-storage " is coordinated.Longitudinal direction " source-net-lotus-storage " in energy internet is primarily referred to as 2 sides
Face：1. by multiple kinds of energy switch technology and information flow, energy stream interaction technique, exploitation and the resource of energy resources are realized
It is mutually coordinated between transportation network, energy transmission network；2. the various of user are unified to be an entirety with energy demand, makes electricity
Further extension turns into the comprehensive use of all-round source domain and can manage power dsm, and General Requirement side resource is being promoted clearly
The further amplification of effect in terms of clean energy consumption, guarantee system safe and stable operation.
And in the home energy source LAN of this patent narrow sense, the complementary various renewable energies just referred in power system of multi-source
Source, including photovoltaic, wind-powered electricity generation etc.；" source-net-lotus-storage " coordinates just to refer to regenerative resource, power network, various load and energy-storage battery, electricity
Coordination between electrical automobile.
2. home energy source LAN working pattern analysis
The mode of operation of RELN is roughly divided into two kinds of grid-connect mode and off-network pattern.When RELN normally runs, it works
In grid-connect mode, once breaking down, it will disconnect with major network, work in off-network pattern.
Grid-connect mode can be divided into again：
1) energy supply model：Distributed power source works in MPPT modes in home energy source LAN, if now distributed
The generated energy of power supply also has residue in addition to whole load normal works are met, and unnecessary electric energy will be delivered to power network, can source routing
Device inversion is exported and controlled by major network side controller to the voltage and frequency of the electric energy of power network.Now home energy source LAN is to power network
The power of conveying is：
Pgrid=PDG-Pload
User under this pattern in the net of Bureau of Energy of family domain can regard the producer of electric energy as, and unnecessary electric energy is reversely sold
To power network, to obtain maximum benefit.
2) energy expenditure pattern：Distributed power source is using MPPT controls in home energy source LAN, but its electric energy for sending
Still it is not enough to load consumption.Now, to maintain the constant of DC bus-bar voltage, power network will be to the offer of home energy source LAN not
The electric energy of foot point.Power network is to the power that home energy source LAN is conveyed：
P′grid=Pload-PDG
User under this pattern in the net of Bureau of Energy of family domain can regard the consumer of electric energy as.
Off-network pattern includes：
1) distributed power source MPPT operational modes：Distributed power source in home energy source LAN uses MPPT to control with most
Big to utilize new energy, energy storage then maintains the constant of DC bus-bar voltage by discharge and recharge, and the power of now energy storage is：
Pstorage=Pload-PDG
If energy storage electric discharge reaches a threshold value and distributed power generation when being still not enough to load and consuming in this mode, one
The non-key load in part is by be ablated maintaining the constant of DC bus-bar voltage.
2) distributed power source downrating pattern：If the energy-storage system in home energy source LAN has reached maximum charge
Limit value, and the generated output of distributed power source, to maintain the constant of DC bus-bar voltage, divides still beyond the demand power that load is total
The necessary downrating of cloth power supply, now has：
PDG=Pload
The topological structure of the energy source router of present invention design is as shown in figure 4, it is made up of following modules：Three-phase high-voltage is whole
It is flow module, DC-DC conversion modules, single-phase/three-phase inversion module, wind-power electricity generation conversion module, photovoltaic generation conversion module, two-way
Energy storage conversion module.
Modularization is top-down when referring to the process of one challenge of solution to be successively divided into some modules system, often
Individual module completes a specific subfunction, and all modules are assembled by some way, as an entirety, completes whole system
The required function of system.
3. control-Strategy analysis
The control strategy of 3.1 solid-state transformers
1st, SST input stages control
The effect of solid-state input stage is：(1) stabilization of VD (HVDC) is kept；(2) load-side is suppressed
Harmonic source conveys harmonic wave to net side, reduces the harmonic content of current on line side, improves its sine degree；(3) PFC is realized,
Keep current on line side and voltage in phase.In order to realize the control of the unity power factor of energy internet net side, using voltage
Current double closed-loop control strategy controls three phase rectifier unit, shown in control block diagram such as Fig. 5 (b).The effect of DC voltage outer shroud
Mainly controlled output DC voltage, it is ensured that DC voltage it is constant；Net survey input current inner ring effect be according to voltage outside
The current-order of ring output carries out current control.Now only need to make q shaft current reference value amounts iq=0, you can realize that unit is defeated
Enter the control of power factor.
2nd, SST intergrades control
SST intergrade DC/DC converter units are by single-phase full bridge inverter circuit, high frequency transformer and single-phase bridge full-controlled rectifier
Circuit is constituted, shown in its topological structure such as Fig. 6 (a).Inverter and rectifier are controlled using PWM in the unit, drive signal
It is complementary trigger pulse that dutycycle is 50%.DC/DC units are full symmetric in structure in the middle of solid-state transformer module, so that
The transmitted in both directions of electric energy can be realized.
In the DC/DC converter unit courses of work, when original side's inverter is asynchronous with the trigger pulse of pair side's rectifier, deposit
In phase angle difference
In formula, P0It is the active power of DC/DC converter units transmission；UdcIt is the DC voltage of high-pressure side input；Udc-lowFor
The DC voltage of low-pressure side output；fHIt is switching frequency；L is leakage inductance；δ is the phase shift angular difference of former pair side modulated signal.By control
Phase shift angular difference δ processed is the DC voltage U of controllable low-pressure side outputdc-low, therefore pi regulator control phase shift angular difference is introduced, its
Control block diagram such as Fig. 6 (b), control waveform such as Fig. 6 (c) of each switch.From above formula, work as δ>Energy forward flow when 0, i.e.,
Home energy source LAN is flowed to from power network；Work as δ<Energy back flowing when 0, i.e., flow into power network from home energy source LAN, realizes
The two-way flow of energy.
3rd, SST output stages control
The output stage of SST is similar to input stage rectification circuit in structure, is actually three-phase inverting circuit, and function is by
Between isolation level the inversion of output low-voltage DC be three-phase main-frequency alternating current supply load.Because SST is to and fro flow of power type,
Output stage herein can act also as input stage and use.Topological structure such as Fig. 7 (a), L in figure of the three-phase inversion unit of output stagef
It is filter inductance, CfIt is filter capacitor.In order to improve the output quality of power supply, using the modulator approach of SPWM or SVPWM, filtered through LC
After ripple device filters higher hamonic wave, make the voltage waveform of output as close possible to sine, its control block diagram such as Fig. 7 (b).
The control of 3.2 photovoltaics, wind-powered electricity generation
In order to realize maximally utilizing for regenerative resource, MPPT controls are employed to photovoltaic and wind-powered electricity generation, make it maximum
Exert oneself, reduce the utilization of fossil energy, but under off-grid operation pattern in the energy LAN energy-storage system because being full of or failure etc.
After reason is out of service, in order to ensure the normal power supply of important load, photovoltaic and wind power system switch to droop control, according to negative
Lotus power demand automatic power generation adjustment power.Control strategy is as shown in Figure 8.
The control of 3.3 energy-storage systems
Energy-storage system in the present invention uses batteries to store energy, and its control uses traditional double-closed-loop control.
4. analysis of cases is emulated
Based on the model that Fig. 4 is home energy source LAN, corresponding emulation is built in MATLAB/SIMULINK
Model.The primary energy side of the home energy source LAN includes a typhoon power generator, one group of photovoltaic panel.
Energy source router in emulation is using the control strategy described by Part III.The emulation of this part is respectively for simultaneously
It is designed when distributed energy change, alternating current-direct current load changing, the system failure in the case of net and off-network, illustrates energy
Transient state, the stable state waveform of each port of the source router under the states such as grid-connected, off-network.
4.1 solid-state transformers are emulated
1st, input stage emulation
What Fig. 9 was given is input stage net side A, B, C three-phase phase voltage waveforms, and amplitude is 8165V, three-phase symmetrical.Figure 10 gives
What is gone out is input stage A phase voltage current waveforms, it can be seen that electric current can well follow voltage waveform in figure, keeps unit power
Factor runs.It is HVDC side voltage waveform in Figure 11, steady state voltage value is 18kV, basically identical with DC reference voltage,
Steady-state error very little, it is ensured that the constant DC voltage of output.
2nd, isolation level emulation
The output of the HVDC of input stage need to be changed into low-voltage direct by isolation level, and the two-way flow of power is considered here.Every
Use high frequency transformer from level, its working frequency in kHz ranks, here using 10kHz as the specified of high frequency transformer
Frequency.Isolation level correlation simulation waveform is given below.
Figure 12~14 are given under 50% Duty ratio control, and input high pressure 18kV direct currents are modulated into high frequency square wave, pass through
High frequency transformer is coupled, and is converted into low-pressure side, and low pressure 600V direct current outputs are changed into through full-controlled rectifier.
3rd, output stage emulation
The input of output stage is the output of isolation level, i.e. low-voltage direct, and being transformed to three-phase alternating current through voltage source inverter supplies
To load.Control targe is：Anti-loading interference maintains the harmonic wave that the constant removal nonlinear load of output voltage is produced, it is ensured that electric current
It is sinusoidal.
The three-phase voltage that Figure 15 is exported when being SST output stages unloaded, it is seen that output voltage three-phase symmetrical, and each phase amplitude is
311V, and waveform quality is good.Figure 16 be output stage with resistive load when A phases output voltage current waveform, it is seen that voltage electricity
Stream waveform can realize good sine degree.
Claims (6)
1. a kind of energy source router of family type energy LAN, including controller, solid-state transformer and multiple interfaces, it is described
Interface connects distributed power source in major network and home energy source LAN, energy storage device and load respectively, and described controller is adjusted
The oriented flowing of electric current between the voltage of solid-state transformer is saved to realize each interface, it is characterised in that described solid-state transformer is
Bi-directional configuration, including input stage high pressure three-phase rectifier, isolation level DC/DC converters and the output stage low voltage three-phase being sequentially connected
Inverter, described DC/DC converters are bidirectionally symmetric structure, including single-phase full bridge inverter circuit, high frequency transformer and unidirectional
Bridge-type all controlled rectifier circuit, the output high voltage direct current inversion of prime rectification link is high frequency by described single-phase full bridge inverter circuit
Square wave, then realizes that secondary is depressured by high frequency transformer, then exports female to low-voltage direct through unidirectional bridge-type all controlled rectifier circuit
Line, low-voltage direct bus connects home energy source LAN by low voltage three-phase inverter.
2. a kind of energy source router of family type energy LAN according to claim 1, it is characterised in that its Working mould
Formula is divided into grid-connect mode and off-network pattern.
3. the energy source router of a kind of family type energy LAN according to claim 2, it is characterised in that it is described and
Net pattern includes：
Energy supply model, distributed power source works in MPPT modes, the total generated output P of distributed power sourceDGMore than total load work(
Rate Pload, unnecessary electric energy through can source router inversion export the power P conveyed to major network to major network, home energy source LANgrid
For：
Pgrid=PDG-Pload；
Energy expenditure pattern, distributed power source works in MPPT modes, the total generated output P of distributed power sourceDGLess than total load work(
Rate Pload, major network to home energy source LAN provide insufficient section electric energy, the power that major network is conveyed to home energy source LAN
Pg'ridFor：
Pg'rid=Pload-PDG。
4. the energy source router of a kind of family type energy LAN according to claim 2, it is characterised in that it is described from
Net pattern includes：
Distributed power source MPPT operational modes, distributed power source works in MPPT modes, and energy storage device remains straight by discharge and recharge
Flow constant, the power P of energy storage device of busbar voltagestorageFor：
Pstorage=Pload-PDG
Wherein, PDGIt is the total generated output of distributed power source, PloadIt is total load power, in this mode, if energy storage device discharges
Power reaches limit value and distributed power generation is less than total load power, and a part of non-key load is removed to maintain dc bus electricity
That presses is constant；
Distributed power source downrating pattern, after energy storage device electricity reaches threshold limit value, distributed power source downrating,
Total generated output is equal to total load power, maintains constant, the P of DC bus-bar voltageDG=Pload。
5. the control strategy of a kind of energy source router as described in Claims 1 to 4 is any, it is characterised in that become including solid-state
Depressor input stage control strategy, specially：Using Double closed-loop of voltage and current high pressure three-phase rectifier, q shaft currents are made to refer to
It is 0 to be worth, and realizes unit input power factor.
6. control strategy according to claim 5, it is characterised in that also including solid-state transformer intergrade control strategy,
Specially：The single-phase full bridge inverter circuit in PWM control DC/DC converters and unidirectional bridge-type all controlled rectifier circuit is respectively adopted,
There is phase shift angular difference with the PWM trigger pulses of unidirectional bridge-type all controlled rectifier circuit in the PWM trigger pulses of single-phase full bridge inverter circuit
δ, controls low-pressure side to export DC voltage U by controlling phase shifting angle δdc-lowFlowed to energy：
Wherein, UdcFor high-pressure side exports DC voltage, Udc-lowFor low-pressure side exports DC bus-bar voltage, L is high frequency transformer
Leakage inductance, fHIt is switching frequency, works as δ>Energy forward flow when 0, i.e. electric energy flow to home energy source LAN from major network, work as δ<When 0
Energy back flows, i.e., electric energy flows into major network from home energy source LAN.
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| CN107591790A (en) * | 2017-09-07 | 2018-01-16 | 湖南利能科技股份有限公司 | A kind of DC energy source router with multi input end |
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Application publication date: 20170606 |