CN207218256U - The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system - Google Patents
The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system Download PDFInfo
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- CN207218256U CN207218256U CN201721254376.0U CN201721254376U CN207218256U CN 207218256 U CN207218256 U CN 207218256U CN 201721254376 U CN201721254376 U CN 201721254376U CN 207218256 U CN207218256 U CN 207218256U
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Abstract
A kind of direct current transportation Double-feed wind power power of the assembling unit fluctuation and fault control system are the utility model is related to, belongs to technical field of wind power generation.The system includes double feed wind power generator, stator side converter, rotor-side converter, net side DC transformer, energy-storage system, first contactor, second contactor；The energy-storage system includes the first energy storage device, the second energy storage device, the first power inverter, the second power inverter, the 3rd power inverter and energy storage control system；The energy storage control system includes data acquisition module, wind power prediction module, dispatching of power netwoks output command communication module, and output control signal is respectively to the power inverter；The data collecting module collected power generator real time power rate, the terminal voltage and charging and discharging currents of the first energy storage device and the second energy storage device, direct current network voltage and electric current, wind speed.The utility model is particularly advantageous for Double-feed wind power unit promoting the use of in flexible direct current power transmission system.
Description
Technical field
The utility model is related to a kind of control system, especially a kind of fluctuation of the direct current transportation Double-feed wind power power of the assembling unit and
Fault control system, belong to technical field of wind power generation.
Background technology
Double feed wind power generator is one of most popular main product of current wind-power market.Traditional double-fed wind
Group of motors is connected using the less back-to-back converter of capacity with generator amature, and the stator of generator directly with power network phase
Connect, therefore, the vibration of generator unit stator magnetic linkage can be caused when line voltage falls failure, and then cause in stator magnetic linkage
Containing flip-flop, fall for unbalanced network voltage and also have negative phase-sequence composition.And the rotating speed of double-fed generator is higher, because
Flip-flop and negative phase-sequence composition in this stator magnetic linkage have higher revolutional slip, and Generator's Rotor Circuit will be caused to produce electricity
Stream or overvoltage.
Double-feed wind power unit low voltage crossing generally use crow bar protection circuit (Crowbar circuits) traditional at present,
Its principle is that its advantage is can to accelerate the decay of fault current using the unnecessary energy of resistance consumption rotor-side, is turned with protection
Sub- side converter；Its shortcoming is that Crowbar circuits once put into operation, by short circuit generator amature winding, makes double-fed generating
Machine is changed into cage induction generator operation, a large amount of reactive powers need to be absorbed from power network to make excitation, this will be unfavorable for electric network fault
Line voltage afterwards recovers rapidly, and energy is wasted by resistance.In addition, the input excision of Crowbar circuits
Moment is extremely important, and it is improper to select, and on the one hand Crowbar circuits will be caused repeatedly to act, on the other hand will likely cause big electricity
Stream impact.
As can be seen here, there is inherent shortcoming in traditional Double-feed wind power unit：1) system low-voltage ride-through capability is poor：Power network
Voltage once falls, and generator unit stator voltage is fallen therewith, when especially line voltage significantly falls, will stator, rotor around
Cause very big fault current in group, DC bus-bar voltage also by rapid increase, seriously jeopardizes aerogenerator unit safe.2) crow bar is protected
Protection circuit control is bad, it will causes bigger harm, is also unfavorable for line voltage recovery, and resistance will waste energy, increase
The radiating pressure of converter cabinet.
In recent years Technology of HVDC based Voltage Source Converter because it has a many advantages such as reliable, control is simple, cost is low and depth
It is concerned, in wind generator system using more and more extensive, there is the grid-connected skill of Large Scale Wind Farm Integration based on flexible DC power transmission
Art scheme, also begin to inquire into application problem of the Technology of HVDC based Voltage Source Converter in Double-feed wind power field, wherein DC power transmission line
It is likely to occur the failures such as Voltage Drop (being usually that single-phase earthing causes), overvoltage, DC power transmission line broken string, serious threat
System safety operation is very few in the research of this aspect at present.
In addition, wind speed change will cause wind driven generator output power to fluctuate, the stabilization of Wind turbines power output is influenceed.
In a word, for Technology of HVDC based Voltage Source Converter using in Double-feed wind power field and promote, establish safe and reliable
The flexible direct current power transmission system of Double-feed wind power field, it is necessary to solve the events such as power swing suppression and Voltage Drop, overvoltage, broken string
Hinder control and protection problem.
The content of the invention
Main purpose of the present utility model is：In view of the above-mentioned problems, propose a kind of based on Technology of HVDC based Voltage Source Converter
New Double-feed wind power power of the assembling unit fluctuation and fault control system, realize the power fluctuation of wind generation set in the case of fluctuations in wind speed
Suppress, make Double-feed wind power unit power output held stationary, and DC power transmission line that Voltage Drop, overvoltage occur, break
Double feed wind power generator and its current transformer are protected during the failures such as line.
In order to reach object above, the fluctuation of the utility model direct current transportation Double-feed wind power power of the assembling unit and Fault Control system
System, it is characterised in that including：Double-feed wind power unit, energy-storage system, first contactor, second contactor；The double-fed wind
Group of motors includes wind energy conversion system, gear-box, double-fed generator, stator side converter, rotor-side converter, net side DC conversion
Device；The energy-storage system includes the first energy storage device, the second energy storage device, the first power inverter, the second power inverter, the
Three power inverters and energy storage control system；The energy storage control system include data acquisition module, wind power prediction module,
Dispatching of power netwoks output command communication module, and output control signal is respectively to the first power inverter, the second power inverter,
Three power inverters；The data collecting module collected Wind turbines realtime power, first energy storage device and the second energy storage
The terminal voltage of equipment, the charging and discharging currents of first energy storage device and the second energy storage device, direct current network voltage and electric current, wind
Speed.
Described stator side converter one end is connected with the stator of the double-fed generator, and the other end is respectively with described first
Contactor, the connection of net side DC transformer；Described rotor-side converter one end is connected with the rotor of the double-fed generator, separately
The other end with the first contactor, first power inverter are connected respectively for one end；First power inverter
The other end is connected with first energy storage device；One end of second power inverter and the stator of the double-fed generator
Connection, the other end are connected with first energy storage device；The other end of the net side DC transformer and the second contactor
Connect, the other end of the second contactor is connected with the 3rd power inverter and DC power transmission line respectively；Described
The other end of three power inverters is connected with second energy storage device.
The stator side converter be voltage source converter (VSC) or can not control rectifier and booster converter combination,
The rotor-side converter is voltage source converter (VSC)；The net side DC transformer is DC boosting current transformer；Described
One power inverter and the 3rd power inverter are direct current reversible transducer；Second power inverter converts for AC/DC
Device.
Above-mentioned direct current transportation Double-feed wind power power of the assembling unit fluctuation and fault control system, its course of work are as follows：
Before blower fan startup is grid-connected, the first contactor is in open position, first by the energy storage control system control
Making first power inverter makes it work in discharge mode, is that the rotor-side converter carries by first energy storage device
For inverter, and make the DC voltage U of the rotor-side converterBIt is stable；Rotor-side converter described in its secondary control is given
The rotor of the double feed wind power generator provides three-phase AC excitation electric current, and Wind turbines start.
After Wind turbines startup, the frequency and amplitude that control the stator side converter to send generator unit stator first
Transformable alternating current carries out rectification, boosting voltage stabilizing, as the DC voltage U of the stator side converterAEqual to described turn
The DC voltage U of sub- side converterBWhen, close the first contactor；Net side DC transformer makes it described in its secondary control
Boost mode is worked in, as its output voltage UDEqual to the line voltage U of DC power transmission linebusWhen, closure second contact
Device, the power that double feed wind power generator is sent are delivered to direct current network.
After Wind turbines are grid-connected, under normal operating conditions, the net side DC transformer is set to work in constant dc power control
Pattern, it is ensured that the stator side converter output voltage UARemain stable；While power swing suppressing method is used, described in control
First power inverter, the 3rd power inverter make it be exported according to the steady output order of power and Double-feed wind power unit
Power situation carries out discharge and recharge to first energy storage device, the second energy storage device respectively, realizes that system power steadily exports.
In the case where Voltage Drop occurs for power network, using Voltage Drop fault control method, described first is controlled respectively
Power inverter, second power inverter, the 3rd power inverter and the rotor-side converter work in voltage
Fall Fault Control pattern, control the net side DC transformer to switch to constant DC voltage control pattern；When line voltage is extensive
After answering normally, using voltage recovery control method, the Wind turbines are made progressively to recover normal.
In the case where overvoltage occurs for power network, the 3rd power inverter is set to work in overvoltage Fault Control mould
Formula, second energy storage device is charged, make its Quick discharger as DC power transmission line, to DC transmission line
Road voltage carries out clamper, suppresses overvoltage, it is ensured that DC power transmission line voltage stabilization.
In the case where DC power transmission line breaks, first switching to the net side DC transformer, to determine direct current voltage-controlled
Molding formula；Next makes second power inverter work in rectification state, first energy storage device is charged, simultaneously
The 3rd power inverter is worked in overvoltage Fault Control pattern, second energy storage device is charged, suppress
Overvoltage；3rd, the rotor-side converter is switched to disconnection fault control model, make the wind driven generator output power be
Zero, and shut down；4th, shut down the stator side converter, second power inverter, net side DC conversion described in locking
Device, the second contactor is disconnected, shut down the 3rd power inverter, overhauled.
Compared with prior art, the beneficial effects of the utility model are：
(1) topological structure of Double-feed wind power machine set system described in the utility model make double-fed generator unit stator not with electricity
Net is joined directly together, but is connected by stator side converter, net side DC transformer with direct current network, so, in line voltage
When falling, either slightly fall and still significantly fall, stator voltage will not be fallen therewith, and rotor-side converter can be fast
Speed is according to Voltage Drop amplitude adjusted electromagnetic torque, and the electric current of stator and rotor in generator, subtracts when effectively limiting Voltage Drop
Small generators power output so that unit generation power balances with power output, improves Double-feed wind power unit in age at failure
Between to the enabling capabilities of line voltage, thus there is more superior low voltage ride-through capability；When line voltage recovers, rotor-side
Current transformer can gradually rise generated output power, reduce the big amplitude variation of the torque of power system restoration moment engine electromagnet and power
It is dynamic, enhance the stability of a system.
(2) when wind speed change causes generated output power to fluctuate, energy storage control system is according to wind power prediction mould
Block prediction goes out activity of force or dispatching of power netwoks output instruction, energy storage device is realized energy interactions with system, effectively suppresses power
Fluctuation, realizes Wind turbines stable output power.
(3) in grid voltage sags or overvoltage, excess energy can be stored in energy storage device by energy-storage system, or
Voltage support is provided to direct current network, and makes generator unit stator voltage and DC-side Voltage Stabilization, effectively protects generator windings
With the safety of current transformer, low voltage crossing control ability is further enhanced, and without traditional Crowbar circuits, can be effectively sharp
Use the energy.
Brief description of the drawings
Fig. 1 is the fluctuation of the utility model direct current transportation Double-feed wind power power of the assembling unit and fault control system pie graph.
Fig. 2 is the utility model net side DC transformer constant dc power control block diagram.
Wherein, 1- stators side converter；2- rotor-side converters；3- net side DC transformers；The power inverters of 4- first；
The energy storage devices of 5- first；The power inverters of 6- the 3rd；The energy storage devices of 7- second；8- energy storage control systems；9- double-fed generators
Rotor；The double-fed generator unit stators of 10-；11- first contactors；12- second contactors；13- DC power transmission lines；14- second
Power inverter.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described in further detail.
As shown in figure 1, the fluctuation of the utility model direct current transportation Double-feed wind power power of the assembling unit and fault control system, bag
Include：Double-feed wind power unit, energy-storage system, first contactor 11, second contactor 12；The Double-feed wind power unit includes wind
Power machine, gear-box, double-fed generator, stator side converter 1, rotor-side converter 2, net side DC transformer 3；The energy storage
System includes the first energy storage device 5, the second energy storage device 7, the first power inverter 4, the second power inverter 14, the 3rd power
Converter 6 and energy storage control system 8；Energy storage control system 8 includes data acquisition module, wind power prediction module, power network and adjusted
Output instruction module is spent, and output control signal is respectively to the first power inverter 4, the second power inverter 14, the 3rd power
Converter 6；Data collecting module collected double feed wind power generator stator voltage UE, the DC side of stator side converter 1 voltage UA
With electric current IA, the DC side of rotor-side converter 2 voltage UBWith electric current IB, the on high-tension side voltage U of net side DC transformer 3DAnd electricity
Flow ID, the first energy storage device 5 terminal voltage UC, the second energy storage device 7 terminal voltage UF, the first energy storage device 5 charging and discharging currents
IC, the second energy storage device 7 charging and discharging currents IF, direct current network voltage UbusWith electric current Ibus, wind speed vw；Double-fed wind-driven power generation
Machine realtime power by the DC side of stator side converter 1 voltage UAWith electric current IA, the DC side of rotor-side converter 2 voltage UBWith
Electric current IBCalculate and obtain.
The one end of stator side converter 1 is connected with the stator 10 of double-fed generator, the other end respectively with first contactor 11,
Net side DC transformer 3 connects；The one end of rotor-side converter 2 is connected with the rotor 9 of double-fed generator, and the other end is respectively with
The other end of one contactor 11, the first power inverter 4 connect；The other end of first power inverter 4 and the first energy storage device 5
Connection；One end of second power inverter 14 is connected with the stator 10 of double-fed generator, and the other end connects with the first energy storage device 5
Connect；The other end of net side DC transformer 3 connects with second contactor 12, the other end of second contactor 12 respectively with the 3rd work(
Rate converter 6 and DC power transmission line 13 connect；The other end of 3rd power inverter 6 is connected with the second energy storage device 7.
Before blower fan startup is grid-connected, first contactor 11 is in open position, controls the first power inverter 4 to make it first
Discharge mode (pressure-increasning state) is worked in, is that rotor-side converter 2 provides DC side power supply by the first energy storage device 5, and make to turn
The DC voltage U of sub- side converter 2BIt is stable；Its secondary control rotor-side converter 2 gives the rotor 9 of double feed wind power generator
Three-phase AC excitation electric current is provided, Wind turbines start.
After Wind turbines startup, the frequency and amplitude that control stator side converter 1 to send generator unit stator 10 first
Transformable alternating current carries out rectification, boosting voltage stabilizing, as the DC voltage U of stator side converter 1AEqual to rotor-side converter
2 DC voltage UBWhen, close first contactor 11；Its secondary control net side DC transformer 3 makes it work in boost mode,
As its output voltage UDEqual to the line voltage U of DC power transmission line 13busWhen, second contactor 12 is closed, by double-feed type wind
The power that generator is sent is delivered to direct current network.
After Wind turbines are grid-connected, under normal operating conditions, net side DC transformer 3 is set to work in constant dc power control mould
Formula, as shown in Fig. 2 the DC voltage reference value U of stator side converter 1A *With its measured value UADifference, limited after PI controllers
Width, the purpose of amplitude limit are to ensure the output current I of net side DC transformer 3DIn allowed limits；After amplitude limit, net is obtained
The reference value I of the output current of side DC transformer 3D *, ID *With its measured value IDDifference through amplitude limit PI controllers be sent into PWM moulds
Block, produce drive signal, control net side DC transformer 3, it is ensured that the DC voltage U of stator side converter 1ARemain stable；
Power swing suppressing method is used simultaneously, and the first power inverter 4 of control, the 3rd power inverter 6 make it steady according to power
Output order and Double-feed wind power unit power output situation carry out charge and discharge to the first energy storage device 5, the second energy storage device 7 respectively
Electricity, it can so be swapped by the energy that energy storage device stores with system, realize that system power steadily exports.
In the case where Voltage Drop occurs for power network, using Voltage Drop fault control method, the first power is controlled respectively
Converter 4, the second power inverter 14, the 3rd power inverter 6 and rotor-side converter 2 work in Voltage Drop Fault Control
Pattern, control net side DC transformer 3 switch to constant DC voltage control pattern；After line voltage recovers normal, using electricity
Recovery control method is pressed, Wind turbines is progressively recovered normal.
In the case where overvoltage occurs for power network, the 3rd power inverter 6 is set to work in overvoltage Fault Control pattern, directly
Flow transmission line of electricity voltage reference value Ubus *With measured value UbusDifference, through PI controllers and amplitude limit link, obtain the second energy storage device
7 charging current reference value IFref, IFrefWith measured value IFDifference, through PI controllers be sent into PWM module, obtain drive signal, control
The 3rd power inverter 6 is made, it is worked in decompression state, the second energy storage device 7 is charged, makes it as direct current transportation
The Quick discharger of circuit 13, to DC power transmission line voltage UbusClamper is carried out, suppresses overvoltage, it is ensured that DC transmission line
Road voltage UbusIt is stable.
In the case where DC power transmission line breaks, that is, detect Ibus=0, the output end voltage of net side DC transformer 3
UDLasting rise, if UDIt is too high, it will to cause system crash.Now, first switch to net side DC transformer 3 and determine direct current
Voltage mode control；Next makes the second power inverter 14 work in rectification state, the first energy storage device 5 is charged, together
When the 3rd power inverter 6 is worked in overvoltage Fault Control pattern, the second energy storage device 7 is charged, suppressed electricity
Pressure；3rd, rotor-side converter 2 is switched to disconnection fault control model, it is 0 to make generated output power, and is shut down；The
Four, stator side converter 1, the second power inverter 14 are shut down, locking net side DC transformer 3, disconnects second contactor 12,
The 3rd power inverter 6 is shut down, is overhauled.
Claims (2)
1. a kind of direct current transportation Double-feed wind power power of the assembling unit fluctuation and fault control system, it is characterised in that including：It is double-fed
Wind turbines, energy-storage system, first contactor, second contactor, the Double-feed wind power unit include wind energy conversion system, gear-box,
Double-fed generator, stator side converter, rotor-side converter, net side DC transformer；The energy-storage system includes the first storage
Can equipment, the second energy storage device, the first power inverter, the second power inverter, the 3rd power inverter and energy storage control system
System；The energy storage control system includes data acquisition module, wind power prediction module, dispatching of power netwoks output command communication mould
Block, and output control signal is respectively to the first power inverter, the second power inverter, the 3rd power inverter；The data
Acquisition module collection Wind turbines realtime power, the terminal voltage of first energy storage device and the second energy storage device, described first
The charging and discharging currents of energy storage device and the second energy storage device, direct current network voltage and electric current, wind speed.
2. the fluctuation of the direct current transportation Double-feed wind power power of the assembling unit and fault control system, its feature exist according to claim 1
In：Described stator side converter one end is connected with the stator of the double-fed generator, and the other end contacts with described first respectively
Device, the connection of net side DC transformer；Described rotor-side converter one end is connected with the rotor of the double-fed generator, the other end
The other end with the first contactor, first power inverter are connected respectively；First power inverter it is another
End is connected with first energy storage device；One end of second power inverter and the stator of the double-fed generator connect
Connect, the other end is connected with first energy storage device；The other end of the net side DC transformer and the second contactor phase
Connect, the other end of the second contactor is connected with the 3rd power inverter and DC power transmission line respectively；Described 3rd
The other end of power inverter is connected with second energy storage device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721254376.0U CN207218256U (en) | 2017-09-28 | 2017-09-28 | The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721254376.0U CN207218256U (en) | 2017-09-28 | 2017-09-28 | The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system |
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| Publication Number | Publication Date |
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| CN207218256U true CN207218256U (en) | 2018-04-10 |
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| CN201721254376.0U Withdrawn - After Issue CN207218256U (en) | 2017-09-28 | 2017-09-28 | The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482653A (en) * | 2017-09-28 | 2017-12-15 | 曲阜师范大学 | The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system and method |
-
2017
- 2017-09-28 CN CN201721254376.0U patent/CN207218256U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482653A (en) * | 2017-09-28 | 2017-12-15 | 曲阜师范大学 | The direct current transportation Double-feed wind power power of the assembling unit fluctuates and fault control system and method |
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| GR01 | Patent grant | ||
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Granted publication date: 20180410 Effective date of abandoning: 20190712 |