CN107394813A - A kind of wind-electricity integration cooperative control device and method based on energy-storage system - Google Patents
A kind of wind-electricity integration cooperative control device and method based on energy-storage system Download PDFInfo
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- CN107394813A CN107394813A CN201710580050.5A CN201710580050A CN107394813A CN 107394813 A CN107394813 A CN 107394813A CN 201710580050 A CN201710580050 A CN 201710580050A CN 107394813 A CN107394813 A CN 107394813A
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- 230000006837 decompression Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 16
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Classifications
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- H02J3/386—
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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
- H02J3/28—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
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a kind of wind-electricity integration cooperative control device based on energy-storage system, is formed by connecting successively by battery energy storage unit, normally opened relay, normally closed relay, buck circuit, boost chopper, end electric capacity, current transformer and power smooth device.The invention also discloses a kind of control method of the wind-electricity integration cooperative control device based on energy-storage system, ensure the uniformity of actual grid-connected power and target power with Intelligence PI control, it effectively prevent battery energy storage unit caused by wind power output power has big difference with target power and cross discharge and recharge, extend the service life of energy-storage battery.Disclosed device of the present invention and control method for coordinating are intended to coordinate control wind-powered electricity generation output, abandon wind and the inadequate phenomenon of electric energy output during solution large-scale wind power is grid-connected, alleviate the contradiction between large-scale wind power and power network consumption, effectively improve wind-electricity integration scale.
Description
Technical field
The invention belongs to technical field of power system operation control, and in particular to a kind of wind-electricity integration based on energy-storage system
Cooperative control device and method.
Background technology
Along with the aggravation of global energy crisis and environmental problem, cleannes height, recyclability strong wind power resources positive day
Benefit turns into the focus studied both at home and abroad, and wind-powered electricity generation networks turns into a kind of inexorable trend.Belong to uncontrollable yet with wind power resources
Natural energy resources, it, which is contributed, has very strong randomness, therefore and caused by wind power fluctuation with it is intermittent be simultaneously guipure
The problems such as voltage, power swing are carried out.Energy storage technology can realize the storage and release of energy, can effectively collect more than needed
Wind resource, the wind-abandoning phenomenon caused by the short-term surplus of wind-resources is avoided, reduces the unnecessary warp caused by energy waste
Ji loss and resource loss, greatly facilitate and improve wind-electricity integration scale.Energy-storage system is combined with blower fan in outlet side, stabilize by
In the unstable caused wind power fluctuation of wind-power electricity generation, alleviate line voltage, grid power fluctuation, led in new-energy grid-connected
There is vast potential for future development in domain.However, energy storage technology research in China's is started late, especially for wind generating technology and storage
The wind storing cogeneration technology that energy technology is combined and formed is even more to start late, therefore how effective, coordination configuration wind stores up connection
Closing runtime turns into the emphasis studied at present.In addition, energy storage side composition portion of the energy-storage battery as wind storage combined operation system
Point, its service life suffers from vital influence for wind storing cogeneration system operation reliability, economy.In view of
How this, effectively improve wind power integration ability, expands grid-connected scale, extends energy-storage battery service life, turns into wind storage joint simultaneously
Key issue in the research of net system coordination control strategy.
The content of the invention
The purpose of the present invention is intended to for wind-electricity integration because fluctuation and intermittence cause power network fluctuation and energy storage electricity
The problem of pond service life is short, there is provided a kind of wind-electricity integration cooperative control device and method based on energy-storage system, it is defeated to wind-powered electricity generation
Go out the corresponding coordination control of progress, abandon wind and the inadequate phenomenon of electric energy output during solution large-scale wind power is grid-connected, alleviate rule greatly
Contradiction between mould wind-powered electricity generation and power network consumption, can maximally utilise wind power resources, effectively improve wind-electricity integration scale, really
Protect the reliability service of grid-connected system.On this basis, provide corresponding method and extend the energy-storage battery life-span.
In order to achieve the above object, the technical side that wind-electricity integration cooperative control device of the present invention based on energy-storage system uses
Case is：
A kind of wind-electricity integration cooperative control device based on energy-storage system, including battery energy storage unit, normally opened relay, often
Close relay, buck circuit, boost chopper, end electric capacity, current transformer and power smooth device；Wherein, the battery
Energy-storage units output cathode is divided into two branch roads, and tie point includes the first normally opened relay, the first normally closed relay being sequentially connected
Device and buck circuit；Second branch road includes the second normally opened relay, the second normally closed relay and the liter being sequentially connected
Chopper circuit is pressed, connection end electric capacity is exported after two-way parallel connection；Hold electric capacity output connection current transformer, the first normally opened relay, first
Normally closed relay, the second normally opened relay, the second normally closed relay form interlock；The current transformer is successively by three couples of IGBT
Bridge arm is formed by connecting, and current transformer input connection power smooth device.
Further, the buck circuit is used to reduce end capacitance voltage value so that Wind turbines are to battery energy storage
Unit charges.
Further, the boost chopper is used to lift end capacitance voltage value so that battery energy storage unit is to wind-powered electricity generation
Unit discharges.
Further, for the power smooth device to be connected to Wind turbines end, smooth wind power unit is input to battery storage
The power of energy unit
In addition, the controlling party of the wind-electricity integration cooperative control device of energy-storage system as described above provided by the invention
Method, comprise the following steps：
(1) system detectio to Wind turbines power output be more than given target power when, tie point first it is normally opened after
Electrical equipment closes, and the first normally closed relay, which is appointed, is in closure state, buck circuit conducting, boost chopper shut-off；Pass through
The switching tube break-make of PWM control buck circuits reduces the energy storage value of output end end electric capacity so that end electric capacity both end voltage
Value is less than Wind turbines output voltage values, and Wind turbines charge to battery energy storage unit；Now the current transformer serves as three-phase bridge
Formula rectifier；
(2) system detectio to Wind turbines power output be less than given target power when, the second branch road second it is normally opened after
Electrical equipment closes, and the second normally closed relay, which is appointed, is in closure state, boost chopper conducting, buck circuit shut-off；Pass through
The switching tube break-make of PWM control boost choppers lifts the energy storage value of output end end electric capacity so that end electric capacity both end voltage
Value is more than Wind turbines output voltage values, and battery energy storage unit discharges to Wind turbines；Now the current transformer serves as three-phase bridge
Formula inverter.
Further, in step (1), the PWM of the control buck circuit switching tube break-make comes from a closed loop
Output；Specifically, target power is made into difference feeding Intelligence PI control with actual grid-connected power makees correlation computations processing, intelligent PI
Controller output is changed through correlation, is changed into corresponding PWM ripples control buck circuit switching tube break-make, and then control wind-powered electricity generation
The speed that unit charges to battery energy storage unit, it is final make it that actual grid-connected power and target power are basically identical.
Further, in step (2), the PWM of the control boost chopper switching tube break-make comes from a closed loop
Output；Specifically, target power is made into correlation computations processing, intelligence with actually entering grid power work difference feeding Intelligence PI control
Energy PI controller outputs are changed through correlation, are changed into corresponding PWM ripples control boost chopper switching tube break-make, and then control
The speed that battery energy storage unit discharges to Wind turbines, it is final make it that actual grid-connected power and target power are basically identical.
Further, PI amplitude limits output valve is declined into a ladder with the fitting that diminishes of power deviation；When actual grid-connected work(
When rate and excessive target power deviation, P regulator parameters keep constant；When power deviation is sufficiently small, the parameters of P adjusters by
Gradual change is small；When actually entering grid power and target power deviation is less than to a certain degree, the parameter of P adjusters is arranged to 0.
Further, in step (1), Wind turbines charge to battery energy storage unit, when system detectio arrives Wind turbines
When stability bandwidth is more than 10% in power output 1min clocks, system calls power smooth device to carry out Wind turbines power output in time
Smoothing processing, larger battery energy storage unit is caused damage so as to prevent from fluctuating.
Further, the current transformer is used based on the theoretical double-closed-loop control of line voltage vector oriented：Voltage controls
Strategy chooses net pressure space vector direction using outer voltage, current inner loop structure, the wherein sense of current；Rotated in voltage synchronous
Current inner loop is designed under coordinate system, each AC compounent is converted into DC quantity, is easy to the design and and SPWM of closed-loop regulator
Or SVPWM interfaces.
Compared with prior art, the advantages of technical scheme and beneficial effect is mainly：
1st, the wind-electricity integration cooperative control device based on energy-storage system that the present invention uses, simple in construction, cost is low, practical
Property is strong, and easy to control, buck circuit and boost chopper are used cooperatively so that battery energy storage unit, which is in, reasonably to be filled
It discharge condition, can maximally utilise with fluctuation and intermittent wind power resources, ensure the reliable fortune of grid-connected system
OK, loss is reduced, is had great importance.Power smooth device is introduced in wind-powered electricity generation input port simultaneously, effectively avoids wind-powered electricity generation output wave
Dynamic property is damaged to caused by battery energy storage unit.
2nd, the wind-electricity integration control method for coordinating based on energy-storage system of the invention, ensure with Intelligence PI control actual
The uniformity of grid power and target power is inputted, effectively prevent caused by wind power output power has big difference with target power
Battery energy storage unit crosses discharge and recharge, extends the service life of energy-storage battery.
Brief description of the drawings
Fig. 1 is the structural representation of the wind-electricity integration cooperative control device based on energy-storage system of the specific embodiment of the invention
Figure；
Fig. 2 is that the wind-electricity integration based on energy-storage system of the specific embodiment of the invention coordinates control block diagram；
Fig. 3 is that intelligent PI becomes amplitude limit schematic diagram；
Fig. 4 is that intelligent PI becomes P Parameter Principle figures；
Fig. 5 is the energy-storage system current transformer control schematic diagram of the specific embodiment of the invention.
Embodiment
1 a kind of wind-electricity integration cooperative control device based on energy-storage system to accompanying drawing 5 to the present invention below in conjunction with the accompanying drawings
And its control method is described in further detail.
Fig. 1 is the structural representation of the wind-electricity integration cooperative control device based on energy-storage system of the present embodiment, such as Fig. 1 institutes
Show, the device includes battery energy storage unit successively, the first normally opened relay KM1, the first normally closed relay KM2, second it is normally opened after
The buck chopper that electrical equipment KM3 and the second normally closed relay KM4, switching tube IGBT1, inductor Lf1 and diode D1 are formed
The boost chopper that device, switching tube IGBT2, inductor Lf2 and diode D2 are formed, Large Copacity storage capacitor C, IGBT1~
The current transformer (three-phase bridge rectifier (inverter)) and power smooth device that IGBT8 is formed.Wherein, the battery energy storage unit
Output cathode is divided into two-way transmission, and tie point is successively by the first normally opened relay KM1, the first normally closed relay KM2 and drop
Press chopper composition；Second the second normally opened relay KM3 of route and the second normally closed relay KM4 and boost chopper group
Into two-way is in parallel, exports connection end electric capacity, the first normally opened relay KM1, the first normally closed relay KM2, the second normally opened relay
KM3 and the second normally closed relay KM4 form two-way interlock, the current transformer (three-phase bridge rectifier (inverter)) according to
It is secondary to be formed by connecting by three pairs of IGBT bridge arms, input connection power smooth device.
The wind-electricity integration cooperative control device based on energy-storage system of the present embodiment, simple in construction, cost is low, practicality
By force, easy to control, buck circuit and boost chopper are used cooperatively so that battery energy storage unit is in rational charge and discharge
Electricity condition, the reliability service for fluctuation and intermittent wind power resources, ensureing grid-connected system can be maximally utilised,
Loss is reduced, is had great importance.Power smooth device is introduced in wind-powered electricity generation input port simultaneously, effectively avoids wind-powered electricity generation output pulsation
Infringement, its control method include to caused by battery energy storage unit：
Due to the randomness that Wind turbines are contributed, the moment stabilization can not be provided to power network according to target power Pref
Power output, it is therefore desirable to which blower fan side coordinates jointly with energy storage side, when Wind turbines power output Pwind is more than to the work(that sets the goal
During rate Pref, remaining wind power Pbess is stored into energy-storage system；Conversely, if Wind turbines power output Pwind is small
In given target power Pref, then the energy Pbess of vacancy part is provided by energy-storage system, common with Wind turbines power output
Power network is flowed into, completes the transmission of given target power.
It is more than given target power and Wind turbines to Wind turbines power output respectively with reference to Fig. 1 to Fig. 5 to export
Two kinds of situations that power is less than given target power coordinate control dress to describe the wind-electricity integration based on energy-storage system of the present invention
The control method put.Specific control method is as follows：
First, when Wind turbines power output is more than given target power in the case of, the control method includes following
Step：
(1) system detectio is more than given target power Pref to Wind turbines power output Pwind, and the first of tie point
Normally opened relay KM1 is closed, and the first normally closed relay KM2, which appoints, is in closure state, buck circuit conducting, boost chopper electricity
Road turns off.
(2) the switching tube IGBT1 break-makes of controller output PWM1 control buck circuits reduce output end end electric capacity C
Energy storage value so that end electric capacity C both end voltage values Vdc is less than Wind turbines end output voltage values, and Wind turbines are to battery energy storage
Unit charges, and now the current transformer (three-phase bridge rectifier (inverter)) serves as three-phase bridge rectifier.
(3) further, in step (2), the PWM1 of the control buck circuit switching tube IGBT1 break-makes comes from
One closed loop output, as shown in Figure 2.Specifically, target power Pref is poor with actually entering grid power Poutput works, will
Difference is fed through Intelligence PI control and makees correlation computations processing, and Intelligence PI control output carries out related conversion, and output is corresponding
PWM1 controls buck circuit switching tube IGBT1 break-makes, control output end end electric capacity C step-down value, and then controls wind turbine
The speed that group charges to battery energy storage unit, Wind turbines power output Pwind are removed and are turned battery energy storage unit charge power
Pbess, it is basically identical to finally give actual grid-connected power P output and target power Pref.
(4) further, in step (3), the two methods of Intelligence PI control combination, can both ensure actual grid-connected
The uniformity of power and target power, it can prevent actual grid-connected power from having big difference with target power to battery energy storage unit again
Cross discharge and recharge, reduce battery energy storage unit life-span.Specifically, PI amplitude limits output valve is fitted to diminishing for power deviation
Stepped decline, regulation is fairly simple, and speed responsive is very fast, as shown in Figure 3；In addition, when actual grid-connected power and target power
When deviation is excessive (1 region and 5 regions), P regulator parameters keep constant；(2 regions and 4th area when power deviation is sufficiently small
Domain), the parameter of P adjusters tapers into；(3rd area when actually entering grid power and target power deviation is less than to a certain degree
Domain), the parameter of P adjusters is arranged to 0, as shown in Figure 4.It so can both ensure that actual grid-connected power converged to rapidly target work(
Rate, actual grid-connected power can be avoided to reach upper and lower jitter phenomenon during target power again.
(5) further, in step (3), Wind turbines charge to battery energy storage unit, when system detectio to Wind turbines
Power output 1min clocks in stability bandwidth be more than 10% when, system calls power smooth device to enter Wind turbines power output in time
Row smoothing processing, prevent from fluctuating the larger life-span for causing damage to battery energy storage unit, increasing energy-storage battery.
(6) further, in step (2), the current transformer (then serving as rectifier) uses and is based on line voltage vector
The double-closed-loop control of orientation theory, as shown in Figure 5.Voltage control strategy is using outer voltage, wherein current inner loop structure, electric current
Choose net pressure space vector direction in direction.Current inner loop is designed under voltage synchronous rotating coordinate system, each AC compounent is changed
For DC quantity, be easy to the design of closed-loop regulator, at the same can very easily with SPWM or SVPWM interfaces.
2nd, when Wind turbines power output is less than given target power in the case of, the control method includes following
Step：
(1) system detectio is less than given target power Pref to Wind turbines power output Pwind, and the second of the second branch road
Normally opened relay KM3 is closed, and the second normally closed relay KM4, which appoints, is in closure state, boost chopper conducting, buck chopper electricity
Road turns off.
(2) the switching tube IGBT2 break-makes of controller output PWM2 control boost choppers lift output end end electric capacity C
Energy storage value so that end electric capacity C both end voltage values Vdc is more than Wind turbines end output voltage values, and battery energy storage unit is to wind-powered electricity generation
Unit discharges, and now the current transformer (three-phase bridge rectifier (inverter)) serves as three-phase bridge type converter.
(3) further, in step (2), the PWM2 of the control boost chopper switching tube IGBT2 break-makes comes from
One closed loop output, as shown in Figure 2.Specifically, target power Pref is poor with actually entering grid power Poutput works, will
Difference is fed through Intelligence PI control and makees correlation computations processing, and Intelligence PI control output carries out related conversion, and output is corresponding
PWM2 controls buck circuit switching tube IGBT2 break-makes, control output end end electric capacity C lifting values, and then controls battery storage
The speed that energy unit discharges to Wind turbines, Wind turbines power output Pwind are superimposed into battery energy storage cell discharge power
Pbess, it is basically identical to finally give actual grid-connected power P output and target power Pref.
(4) further, in step (3), the two methods of Intelligence PI control combination, can both ensure actual grid-connected
The uniformity of power and target power, it can prevent actual grid-connected power from having big difference with target power to battery energy storage unit again
Cross discharge and recharge, reduce battery energy storage unit life-span.Specifically, PI amplitude limits output valve is diminished into ladder with power deviation
Shape declines, and regulation is fairly simple, and speed responsive is very fast, as shown in Figure 3；In addition, when actual grid-connected power and target power deviation
When excessive (1 region and 5 regions), P regulator parameters keep constant；When power deviation is sufficiently small (2 regions and 4 regions), P is adjusted
The parameter of section device tapers into；When actually entering grid power and target power deviation is less than to a certain degree (3 region), P is adjusted
The parameter of section device is arranged to 0, as shown in Figure 4.It so can both ensure that actual grid-connected power converged to rapidly target power, again might be used
Jitter phenomenon above and below during avoiding actual grid-connected power arrival target power.
(5) further, in step (2), the current transformer (then serving as inverter) uses and is based on line voltage vector
The double-closed-loop control of orientation theory, as shown in Figure 5.Voltage control strategy is using outer voltage, wherein current inner loop structure, electric current
Choose net pressure space vector direction in direction.Current inner loop is designed under voltage synchronous rotating coordinate system, each AC compounent is changed
For DC quantity, be easy to the design of closed-loop regulator, at the same can very easily with SPWM or SVPWM interfaces.
Claims (10)
1. a kind of wind-electricity integration cooperative control device based on energy-storage system, it is characterised in that including battery energy storage unit, normally opened
Relay, normally closed relay, buck circuit, boost chopper, end electric capacity, current transformer and power smooth device；Wherein,
The battery energy storage unit output cathode is divided into two branch roads, the first normally opened relay that tie point includes being sequentially connected, first
Normally closed relay and buck circuit；Second branch road includes the second normally opened relay, the second normally closed relay being sequentially connected
Device and boost chopper, connection end electric capacity is exported after two-way parallel connection；Hold electric capacity output connection current transformer, the first normally opened relay
Device, the first normally closed relay, the second normally opened relay, the second normally closed relay form interlock；The current transformer successively by
Three pairs of IGBT bridge arms are formed by connecting, and current transformer input connection power smooth device.
2. the wind-electricity integration cooperative control device based on energy-storage system as claimed in claim 1, it is characterised in that the decompression
Chopper circuit is used to reduce end capacitance voltage value so that Wind turbines charge to battery energy storage unit.
3. the wind-electricity integration cooperative control device based on energy-storage system as claimed in claim 1, it is characterised in that the boosting
Chopper circuit is used to lift end capacitance voltage value so that battery energy storage unit discharges to Wind turbines.
4. the wind-electricity integration cooperative control device based on energy-storage system as claimed in claim 1, it is characterised in that the power
For smoother to be connected to Wind turbines end, smooth wind power unit is input to the power of battery energy storage unit.
5. the controlling party of the wind-electricity integration cooperative control device based on energy-storage system as any one of Claims 1-4
Method, it is characterised in that comprise the following steps：
(1) system detectio to Wind turbines power output be more than given target power when, the first normally opened relay of tie point
Closure, the first normally closed relay, which is appointed, is in closure state, buck circuit conducting, boost chopper shut-off；Controlled by PWM
The switching tube break-make of buck circuit processed reduces the energy storage value of output end end electric capacity so that end electric capacity both end voltage value is less than
Wind turbines output voltage values, Wind turbines charge to battery energy storage unit；Now the current transformer serves as three-phase bridge rectification
Device；
(2) system detectio to Wind turbines power output be less than given target power when, the second normally opened relay of the second branch road
Closure, the second normally closed relay, which is appointed, is in closure state, boost chopper conducting, buck circuit shut-off；Controlled by PWM
The switching tube break-make of boost chopper processed lifts the energy storage value of output end end electric capacity so that end electric capacity both end voltage value is more than
Wind turbines output voltage values, battery energy storage unit discharge to Wind turbines；Now the current transformer serves as three-phase bridge type inverse
Device.
6. control method according to claim 5, it is characterised in that in step (1), the control buck circuit is opened
The PWM for closing pipe break-make comes from a closed loop output；Specifically, target power is made into difference with actual grid-connected power is sent into intelligent PI
Controller makees correlation computations processing, and Intelligence PI control output is changed through correlation, is changed into corresponding PWM ripples control buck chopper
Contactor pipe break-make, and then the speed for controlling Wind turbines to be charged to battery energy storage unit, it is final to cause actual grid-connected power
It is basically identical with target power.
7. control method according to claim 5, it is characterised in that in step (2), the control boost chopper is opened
The PWM for closing pipe break-make comes from a closed loop output；Specifically, by target power and actually enter grid power work difference feeding intelligence
Energy PI controllers make correlation computations processing, and Intelligence PI control output is changed through correlation, are changed into corresponding PWM ripples control and boost
Chopper circuit switching tube break-make, and then the speed for controlling battery energy storage unit to be discharged to Wind turbines, it is final make it that reality is grid-connected
Power is basically identical with target power.
8. according to the control method described in claim 6 and 7, it is characterised in that the change by PI amplitude limits output valve with power deviation
Small fitting declines into a ladder；When actual grid-connected power and excessive target power deviation, P regulator parameters keep constant；When
When power deviation is sufficiently small, the parameter of P adjusters tapers into；It is less than one when actually entering grid power and target power deviation
When determining degree, the parameter of P adjusters is arranged to 0.
9. control method according to claim 5, it is characterised in that in step (1), Wind turbines are to battery energy storage unit
Charging, when stability bandwidth is more than 10% in the power output 1min clocks of system detectio to Wind turbines, system calls power in time
Smoother is smoothed to Wind turbines power output, larger battery energy storage unit is caused damage so as to prevent from fluctuating.
10. control method according to claim 5, it is characterised in that the current transformer uses and is based on line voltage vector
The double-closed-loop control of orientation theory：Voltage control strategy chooses net using outer voltage, current inner loop structure, the wherein sense of current
Press space vector direction；Current inner loop is designed under voltage synchronous rotating coordinate system, each AC compounent is converted into DC quantity, just
In closed-loop regulator design and with SPWM or SVPWM interfaces.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482671A (en) * | 2017-07-20 | 2017-12-15 | 中国矿业大学 | Current mode photovoltaic combining inverter low voltage ride through control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103190069A (en) * | 2010-11-03 | 2013-07-03 | 拉穆股份有限公司 | High power density srms |
| CN105098786A (en) * | 2015-09-18 | 2015-11-25 | 许昌学院 | System and method for stabilizing voltage fluctuation of wind power micro-grid employing super capacitors |
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| CN103190069A (en) * | 2010-11-03 | 2013-07-03 | 拉穆股份有限公司 | High power density srms |
| CN105098786A (en) * | 2015-09-18 | 2015-11-25 | 许昌学院 | System and method for stabilizing voltage fluctuation of wind power micro-grid employing super capacitors |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482671A (en) * | 2017-07-20 | 2017-12-15 | 中国矿业大学 | Current mode photovoltaic combining inverter low voltage ride through control system and method |
| CN107482671B (en) * | 2017-07-20 | 2019-08-13 | 中国矿业大学 | Current mode photovoltaic combining inverter low voltage ride through control system and method |
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Application publication date: 20171124 |