CN105186559B - A kind of double-fed wind power generator group low voltage crossing circuit and its control method - Google Patents
A kind of double-fed wind power generator group low voltage crossing circuit and its control method Download PDFInfo
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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
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Abstract
The invention discloses a kind of double-fed wind power generator group low voltage crossing circuit, including：Crowbar circuit, absorption circuit, crowbar circuit is connected between the dc bus positive and negative terminal of current transformer and generator amature by breaker.A kind of control method of double-fed wind power generator group low voltage crossing circuit is also disclosed, according to the size of rotor-side excess energy, selectivity triggering crow bar loop.It is this by rotor-side excess energy size come in the way of selecting incision excision crow bar loop; effectively increase the operation stability of electricity generation system; on the basis of stable current transformer busbar voltage; reduce due to the transient process that input crowbar circuit is caused; electricity generation system is protected from excessive energy impact; avoid damaging pusher side current transformer and rotor windings, and as much as possible provide reactive power support for power network.
Description
Technical field
The invention belongs to technical field of wind power generation, particularly a kind of double-fed wind power generator group low voltage crossing circuit and
Its control method.
Background technology
Wind-power electricity generation has been increment most fast forms of electricity generation outside water generating in generation of electricity by new energy category.Cause
This, from the point of view of the wind-force reserves natural conditions of China aspect, we have highly beneficial condition to develop this industry.From
From the point of view of wind resource reserves, according to the data of National Meteorological Bureau, China is liftoff 10 meters high wind energy resources gross reserves about 32.26 hundred million
Kilowatt, wherein can the wind energy content of development and utilization have 2.53 hundred million kilowatts, 1 more than than 10 meters height of wind energy resources of 50 meters of height
Times, about 500,000,000 kilowatts, coastal waters can the wind energy content of development and utilization have 7.5 hundred million kilowatts.Therefore, from the point of view of with regard to wind resource reserves,
Have ready conditions exploitation wind-power electricity generation.From the point of view of wind generating technology aspect, the existing Duo Jia complete-system vendors product of China reaches in terms of complete machine
Advanced international standard, and export to foreign countries；China also has many enterprises and researched and developed successfully simultaneously in terms of power inverter used for wind power generation
It is able to install and use in wind field, current mainstream model is that 1.5MW and 2MW, at present country's development ＆ production and similar model are supporting
The enterprise of power inverter also has more than ten, and main flow topological structure is substantially two level；More than 2MW types are due to power device
A series of problems, such as capacity increase, caloric value increase, supporting protection equipment dilatation, it is set to be in the research and development trial operation stage.
For comprehensive country's wind power converter present situation, we have technical foundation, technological reserve, Technology Potential to develop wind-power electricity generation
Industry, we should make great efforts this good industry of development, and be allowed to build energy saving and environment friendly social green assistant for us.
As wind field scale increasingly increases, the ratio increase of whole power network, single wind-force are accounted for after wind power plant is grid-connected
Alternator failure can all cause whole wind field failure, or even cause whole grid disconnection.And as in wind power plant
Most common failure is exactly grid voltage sags, therefore has become the important of decision power grid security with low voltage ride-through capability
Factor, also enters the entry criteria in market as wind-force generating converter.Therefore the low electricity for generated output converter of having an effect is studied
It is necessary to press ride-through capability.So-called low voltage crossing is exactly：When wind-driven generator grid entry point Voltage Drop, blower fan
It can keep grid-connected, or even certain reactive power is provided to power network, support power system restoration, until power system restoration is normal,
As domestic and international Wind turbines large-scale grid connection generates electricity, when seriously falling or disturbing in short-term occur in wind farm voltage
When dynamic, large-scale Wind turbines off-grid is likely to result in, the damage for causing the system equipments such as generator and current transformer is directly returned, very
To causing mains breakdown.Therefore the Wind turbines of wind power plant operation must have certain low voltage ride-through capability, ensure that unit exists
Wind turbines can smooth through fault, guarantee unit and power grid security when above-mentioned electric network fault occurs.Wind turbine generator system low voltage is worn
More technical research has become one of domestic and foreign scholars study hotspot, most common low voltage crossing technical scheme using actively or
Passive crowbar circuit correlation technique, general low voltage crossing circuit includes the pusher side current transformer between wind-driven generator and power network
With net side current transformer and for being arranged on the crowbar circuit of wind power generator rotor side, realize that low-voltage is worn by crowbar circuit
More.
And be in place of the deficiencies in the prior art：Crowbar circuit is connected in parallel on rotor windings with current transformer, triggering sled
During stick circuit, unit excess power is largely consumed in crowbar circuit, causes Wind turbines to provide effective nothing without normal direction power network
Work(is supported, the recovery of unfavorable use power network.
The content of the invention
For above-mentioned technical problem, the invention discloses a kind of double-fed wind power generator group low voltage crossing circuit and its control
Method processed, by selectively controlling the incision and excision in crow bar loop, is solved during electric network fault recovers, wind turbine
The problems such as group reactive power support undercapacity, while improving the operation stability of unit.
In order to realize that there is provided a kind of double-fed wind power generator group low voltage crossing circuit, hair according to the purpose of the present invention
The rotor of motor is connected by current transformer with power network, and stator is connected by grid-connected switch with power network, including：
Crowbar circuit, it is made up of three-phase commutation bridge, high-power bleeder resistance and selecting switch, the three-phase commutation bridge
Exchange end be connected one by one with the rotor outgoing line end of the generator, the high-power bleeder resistance is connected in series with selecting switch
Between the positive negative DC terminal of the three-phase commutation bridge；Absorption circuit, it is made up of controllable diode, electric capacity and absorption resistance,
The positive pole of the controllable diode is connected with the end of incoming cables of the selecting switch, and the electric capacity and absorption resistance are in parallel and are arranged on
Between the controllable diode negative pole and the three-phase commutation bridge direct-flow positive pole end；Wherein, the positive and negative direct current of the three-phase commutation bridge
End is connected with the dc bus positive and negative terminal of the current transformer respectively by breaker.
It is preferred that, the current transformer is four quadrant convertor, and it includes the pusher side frequency conversion being connected with the generator amature
Device, the net side frequency converter being connected with power network.
It is preferred that, it has been arranged in parallel storage capacitor and chopper circuit between the current transformer dc bus.
It is preferred that, the chopper circuit includes：The first switch and energy consumption resistor being connected in series, the first switch is
IGBT switching tubes.
It is preferred that, the three-phase commutation bridge is uncontrollable rectifier bridge, and the selecting switch is IGBT switching tubes.
A kind of control method of double-fed wind power generator group low voltage crossing circuit is right for when grid voltage sags
Generator and current transformer provide protection, comprise the following steps：
1) grid voltage sags moment, synchro measure current transformer DC bus-bar voltage and crow bar loop DC voltage；
2) when current transformer DC bus-bar voltage increases to energy consumption resistor trigger voltage, selectivity conducting first switch, consumption
Excess energy between energy resistance consumption dc bus, DC bus-bar voltage liter is limited by controlling the ON time of first switch
It is high so that DC bus-bar voltage is maintained in normal fluctuation range；
3) when crow bar loop DC voltage increases to the trigger voltage in crow bar loop, close circuit breaker disconnects first
Switch, turns on selecting switch, and triggering crow bar loop, high-power bleeder resistance conducting consumes the excess energy of rotor-side, limitation becomes
The rise of device DC bus-bar voltage is flowed, when crow bar loop DC voltage falls back to the trigger voltage less than crow bar loop, is first broken
Open selecting switch, cut off high-power bleeder resistance, then cut-off breaker excision crow bar loop, and selectively turn on first switch,
Return to step 2)；
4) if crow bar loop DC voltage further raises and exceedes the trigger voltage certain proportion in crow bar loop,
The conducting state of selecting switch is kept, cut-off breaker, locking pusher side frequency converter, crow bar loop independently consumes the surplus of rotor-side
Energy, until crow bar loop DC voltage falls back to the trigger voltage less than crow bar loop, disconnects selecting switch, cuts off crow bar
Loop, returns to step 2).
It is preferred that, absorption circuit absorbs the instantaneous of selecting switch and cut-offs peak surge voltage.
It is preferred that, the current transformer is four quadrant convertor, and it includes the pusher side frequency conversion being connected with the generator amature
Storage capacitor and chopper circuit have been arranged in parallel between device, the net side frequency converter being connected with power network, the current transformer dc bus.
It is preferred that, the chopper circuit includes：The first switch and energy consumption resistor being connected in series, the first switch
For IGBT switching tubes.
It is preferred that, the three-phase commutation bridge is uncontrollable rectifier bridge, and the selecting switch is IGBT switching tubes.
The present invention at least includes following beneficial effect：
1st, according to the size of rotor-side excess energy, selectivity triggering crow bar loop effectively increases the fortune of electricity generation system
On the basis of row stability, stable current transformer busbar voltage, reduce due to the transient process that input crowbar circuit is caused；
2nd, according to the size of rotor-side excess energy, crow bar loop is linked on current transformer dc bus or isolated operation
Excess energy is consumed, electricity generation system is protected from excessive energy impact, it is to avoid pusher side current transformer and rotor windings are damaged；
3rd, reactive power support as much as possible is provided for power network, helps the recovery of its voltage.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the low voltage crossing circuit diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or many
The presence or addition of individual other elements or its combination.
As shown in Fig. 1 shape is realized according to one kind of the double-fed wind power generator group low voltage crossing circuit of the present invention
Formula, including：
A kind of double-fed wind power generator group low voltage crossing circuit, double-fed generator DFIG rotor passes through current transformer and electricity
Net connection, stator is connected by grid-connected switch K1 with power network, when generator generates electricity below synchronous rotational speed, and rotor is inhaled from power network
Receipts electric energy, stator output electricity, by grid-connected switch K1 to grid transmission, when generator is in the generating of supersynchronous rotating speed, rotor
Electric energy is sent to power network simultaneously with stator, specifically passing through circuit includes：
Crowbar circuit, the excess energy for consuming rotor-side provides protection, crowbar circuit to generator and current transformer
Be made up of three-phase commutation bridge, high-power bleeder resistance R3 and selecting switch T2, the exchange end of the three-phase commutation bridge with it is described
The rotor outgoing line end of generator is connected one by one, and the high-power bleeder resistance R3 and selecting switch T2 is connected in series, high-power to let out
The electric discharge resistance R3 other ends are connected with the three-phase commutation bridge direct-flow positive pole, selecting switch the T2 other end and rectifier bridge direct current negative pole
Connection；Absorption circuit, for absorb selecting switch T2 it is instantaneous cut-off peak surge voltage, absorbing circuit by controllable diode,
Electric capacity C2 and absorption resistance R2 is constituted, and the positive pole of the controllable diode D2 is connected with the end of incoming cables of the selecting switch, institute
State electric capacity C and absorption resistance R2 parallel connections and be arranged on the controllable diode D2 negative poles and the three-phase commutation bridge direct-flow positive pole end
Between；Wherein, dc bus of the positive negative DC terminal of the three-phase commutation bridge by breaker K2 respectively with the current transformer is positive and negative
End connection, overcurrent, the overvoltage grade produced according to rotor-side, selective triggering crow bar loop and optionally by crow bar
Loop is linked on current transformer dc bus, when crow bar loop is triggered and is linked on unsteady flow bus, high-power bleeder resistance
R3 absorbs rotor-side excess energy, suppresses rotor-side and overvoltage, overcurrent on current transformer dc bus, while being effectively electricity
Net provides reactive power support, helps line voltage to recover.When crow bar loop is cut off from current transformer dc bus, the pusher side of current transformer
Frequency converter locking, crow bar loop independently consumes the impact excess energy on rotor, effectively protection rotor and current transformer, when on rotor
Excess energy is consumed to a certain degree, when the DC terminal voltage in crow bar loop is dropped to below the trigger voltage of crow bar loop, excision sled
Rod loop, remaining excess energy is absorbed by current transformer, and provides reactive power support to power network, helps line voltage to recover.
In above-mentioned technical proposal, the current transformer is four quadrant convertor, realizes the two-way flow of energy, unsteady flow implement body
Including the pusher side frequency converter being connected with the generator amature, the net side frequency converter being connected with power network, the current transformer direct current is female
Storage capacitor C1 and chopper circuit have been arranged in parallel between line.The chopper circuit includes：The first switch T1 that is connected in series and
Energy consumption resistor R1, the first switch T1 are IGBT switching tubes.Chopper circuit is used within the specific limits, open by control first
T1 ON time is closed to turn on the excess energy produced on dead resistance R1, consumption current transformer bus, over-voltage and mistake
Electric current, protection current transformer is against damages, meanwhile, reactive power support is provided to power network by net side frequency converter, helps line voltage to recover.
In above-mentioned technical proposal, the three-phase commutation bridge is uncontrollable rectifier bridge, and the selecting switch T2 switchs for IGBT
Pipe, emitter stage is connected with crowbar circuit direct current negative pole end, and colelctor electrode is connected with high-power bleeder resistance R3.
There is provided a kind of control method of double-fed wind power generator group low voltage crossing circuit, for working as grid voltage sags
When, protection is provided to generator and current transformer, is comprised the following steps：
1) during generator normal work, selecting switch T2, breaker K2 are off, grid voltage sags moment,
Synchro measure current transformer DC bus-bar voltage and crow bar loop DC voltage, now because stator exports the reduction of energy, lead
Cause rotor-side to produce excess energy, cause rotor-side overvoltage and overcurrent, in turn result in current transformer DC bus-bar voltage and sled
Overvoltage on the DC side of rod loop, is impacted to generator and current transformer, or even is damaged, the size of excess energy and generating
The instantaneous electric amount of machine and line voltage fall amplitude proportional；
2) when current transformer DC bus-bar voltage increases to energy consumption resistor R1 trigger voltages, selectivity conducting first switch
T1, energy consumption resistor R1 is linked between dc bus, the excess energy between consumption dc bus, suppresses overvoltage, overcurrent,
According to the size of excess energy, DC bus-bar voltage rise is limited by controlling first switch T1 ON time so that straight
Stream busbar voltage is maintained in normal fluctuation range, stable current transformer, it is to avoid cause to damage, while the part on dc bus
Excess energy provides reactive power support by net side frequency converter to power network, until electric network fault excision, and generator recovers to generate electricity again；
3) as the electric network fault time increases or because grid voltage sags amplitude is larger, rotor-side is caused to produce substantial amounts of
Excess energy, causes the further increase of overvoltage in DC terminal, DC voltage increases to crow bar loop when crow bar loop
During trigger voltage, close circuit breaker K2 disconnects first switch T1, turns on selecting switch T2, triggering crow bar loop is let out by high-power
Electric discharge hinders R3 to consume the excess energy of rotor-side, limitation current transformer DC bus-bar voltage rise, stable electric generation system operation peace
Entirely, pusher side frequency converter and crow bar loop are in parallel, and current distributing enters on dc bus, reduces the impact to pusher side frequency converter,
A part of Process Energy provides reactive power support by net side frequency converter to power network simultaneously, helps line voltage to recover；With excess energy
The consumption of amount, when crow bar loop DC voltage falls back to the trigger voltage less than crow bar loop, first disconnects selecting switch T2,
High-power bleeder resistance R3 is cut off, absorption circuit absorbs peak surge voltage when selecting switch T2 instantaneously cut-offs, then disconnects disconnected
Road device K2 excision crow bars loop, and first switch T1 is selectively turned on, return to step 2)；
If 4) during grid voltage sags, cause the impact of the larger excess energy of rotor-side so that crow bar loop direct current
When side voltage further raises and exceedes the trigger voltage certain proportion in crow bar loop, such as exceed the trigger voltage in crow bar loop
When 20%, selecting switch T2 conducting state is kept, triggering breaker K2 disconnects so that crow bar loop departs from current transformer, and
Locking pusher side frequency converter, to protect it from impact, crow bar loop independently consumes the excess energy of rotor-side, the three-phase commutation bridge
For uncontrollable rectifier bridge, its withstanding voltage is higher, can be subjected to the impact of larger excess energy, until crow bar loop DC side electricity
The trigger voltage for dropping below crow bar loop is pushed back, selecting switch T2 is disconnected, excision crow bar loop, absorption circuit absorbs selection and opened
Peak surge voltage when T2 instantaneously cut-offs is closed, step 2 is then return to), remaining excess energy is absorbed by chopper circuit.
In above-mentioned technical proposal, the current transformer is four quadrant convertor, and it includes what is be connected with the generator amature
Be arranged in parallel between pusher side frequency converter, the net side frequency converter being connected with power network, the current transformer dc bus storage capacitor C and
Chopper circuit.
In above-mentioned technical proposal, the chopper circuit includes：The first switch T1 and energy consumption resistor R1 being connected in series,
The first switch T1 is IGBT switching tubes, and the selecting switch T2 is IGBT switching tubes.
From the above mentioned, the present invention is provided a kind of double-fed wind power generator group low voltage crossing circuit and its control method,
According to the size of rotor-side excess energy, selectivity triggering crow bar loop, passes sequentially through copped wave according to excess energy from small to large
Circuit provides reactive power support to suppress current transformer DC bus-bar voltage rise to power network；Crowbar circuit is triggered again, and is accessed
Onto current transformer dc bus, excess energy is absorbed by high-power bleeder resistance, suppresses DC bus-bar voltage and further raises,
Simultaneously reactive power support is provided by net side current transformer to power network；During last excessive excess energy, crow bar loop is straight from current transformer
Flow and cut off on bus, crow bar loop consumes alone the excess energy of rotor-side.It is this to be selected according to rotor-side excess energy size
The mode in incision excision crow bar loop is selected, the operation stability of electricity generation system is effectively increased, stable current transformer busbar voltage
On the basis of, reduce due to the transient process that input crowbar circuit is caused, protect electricity generation system from excessive energy impact, it is to avoid damage
Bad pusher side current transformer and rotor windings, and reactive power support as much as possible is provided for power network, help the recovery of its voltage.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the legend with description.
Claims (5)
1. a kind of control method of double-fed wind power generator group low voltage crossing circuit, the rotor of generator passes through current transformer and electricity
Net connection, stator is connected by grid-connected switch with power network, the double-fed wind power generator group low voltage crossing that the control method is used
Circuit, including：Crowbar circuit, it is made up of three-phase commutation bridge, high-power bleeder resistance and selecting switch, the three phase rectifier
The exchange end of bridge is connected one by one with the rotor outgoing line end of the generator, and the high-power bleeder resistance is connected company with selecting switch
It is connected between the positive negative DC terminal of the three-phase commutation bridge；Absorption circuit, it is by controllable diode, electric capacity and absorption resistance structure
Into the positive pole of the controllable diode is connected with the end of incoming cables of the selecting switch, and the electric capacity and absorption resistance are in parallel and set
Put between the controllable diode negative pole and the three-phase commutation bridge direct-flow positive pole end；Wherein, the three-phase commutation bridge is positive and negative
DC terminal is connected with the dc bus positive and negative terminal of the current transformer respectively by breaker；The current transformer is four-quadrant unsteady flow
Device, it includes the pusher side frequency converter being connected with the generator amature, the net side frequency converter being connected with power network；The current transformer is straight
Storage capacitor and chopper circuit have been arranged in parallel between stream bus；The chopper circuit includes：The first switch that is connected in series and
Energy consumption resistor, the first switch is IGBT switching tubes；The three-phase commutation bridge is uncontrollable rectifier bridge, and the selecting switch is
IGBT switching tubes；
The control method of double-fed wind power generator group low voltage crossing circuit is used for when grid voltage sags, to generator and change
Flow device and protection is provided, it is characterised in that comprise the following steps：
1) grid voltage sags moment, synchro measure current transformer DC bus-bar voltage and crow bar loop DC voltage；
2) when current transformer DC bus-bar voltage increases to energy consumption resistor trigger voltage, selectivity conducting first switch, power consumption electricity
Excess energy between resistance consumption dc bus, DC bus-bar voltage rise is limited by controlling the ON time of first switch,
So that DC bus-bar voltage is maintained in normal fluctuation range；
3) when crow bar loop DC voltage increases to the trigger voltage in crow bar loop, close circuit breaker disconnects first switch,
Selecting switch is turned on, triggering crow bar loop, high-power bleeder resistance conducting consumes the excess energy of rotor-side, limits current transformer
DC bus-bar voltage is raised, when crow bar loop DC voltage falls back to the trigger voltage less than crow bar loop, first disconnects choosing
Switch is selected, high-power bleeder resistance, then cut-off breaker excision crow bar loop is cut off, and selectively turns on first switch, is returned to
Step 2)；
4) if crow bar loop DC voltage further raises and exceedes the trigger voltage certain proportion in crow bar loop, keep
The conducting state of selecting switch, cut-off breaker, locking pusher side frequency converter, crow bar loop independently consumes the excess energy of rotor-side
Amount, until crow bar loop DC voltage falls back to the trigger voltage less than crow bar loop, disconnects selecting switch, excision crow bar is returned
Road, returns to step 2).
2. the control method of double-fed wind power generator group low voltage crossing circuit as claimed in claim 1, it is characterised in that inhale
Withdraw the instantaneous of road absorption selecting switch and cut-off peak surge voltage.
3. the control method of double-fed wind power generator group low voltage crossing circuit as claimed in claim 1, it is characterised in that institute
Current transformer is stated for four quadrant convertor, it includes the pusher side frequency converter being connected with the generator amature, the net being connected with power network
Storage capacitor and chopper circuit have been arranged in parallel between side frequency converter, the current transformer dc bus.
4. the control method of double-fed wind power generator group low voltage crossing circuit as claimed in claim 3, it is characterised in that institute
Stating chopper circuit includes：The first switch and energy consumption resistor being connected in series, the first switch are IGBT switching tubes.
5. the control method of double-fed wind power generator group low voltage crossing circuit as claimed in claim 1, it is characterised in that institute
Three-phase commutation bridge is stated for uncontrollable rectifier bridge, the selecting switch is IGBT switching tubes.
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| CN105743374A (en) * | 2016-04-27 | 2016-07-06 | 中国农业大学 | Topological structure and control method optimized low-voltage ride through power supply apparatus used for frequency converter |
| CN107390079B (en) * | 2017-09-06 | 2020-01-24 | 阳光电源股份有限公司 | Current transformer, crowbar circuit, state detection method and control method of crowbar circuit |
| CN108023470B (en) * | 2017-12-29 | 2020-11-10 | 天津瑞能电气有限公司 | Crowbar protection circuit for double-fed power generation system |
| CN109050859B (en) * | 2018-06-12 | 2020-06-26 | 同济大学 | Double-fed ship hybrid shaft motor independent propulsion system and control method thereof |
| CN110224423B (en) * | 2019-05-13 | 2020-09-29 | 南方电网科学研究院有限责任公司 | Flexible direct-current energy consumption device and circulation control method thereof |
| CN112994077A (en) * | 2019-12-16 | 2021-06-18 | 国网山东省电力公司潍坊供电公司 | Frequency converter of double-fed wind generating set |
| CN111245011A (en) * | 2020-02-06 | 2020-06-05 | 东方电气风电有限公司 | Wind generating set operation mode and device thereof |
| CN116093904B (en) * | 2023-04-10 | 2023-06-13 | 三峡智控科技有限公司 | DC bus overvoltage protection circuit and element parameter configuration method |
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