CN107994588A - Lift the idle control strategy of wind power plant of wind power integration light current net transient stability - Google Patents
Lift the idle control strategy of wind power plant of wind power integration light current net transient stability Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of idle control strategy of wind power plant for lifting large-scale wind power access light current net transient stability, which is divided into two aspects of unit and wind power plant：In unit aspect, using idle priority acccess control；In wind power plant aspect, transient state imbalance energy predicting value is calculated based on transient energy method, and calculates Transient Voltage Stability nargin, the different directly driven wind-powered idle outputs of unit of adjustment, and give Reactive-power control instruction issuing to each unit.Strategy is interacting according to wind power plant in system and electric system used by controller totality, by the Reactive Power Control of wind power plant, is decomposed into the additional control to wind turbine.Control strategy proposed by the present invention does not have to add any hardware, make full use of the communication capacity and the directly driven wind-powered unit control strategy of itself of wind power plant centralized control system, the unreasonable fluctuation of wind power plant entirety reactive voltage is avoided, the transient stability performance of the light current net entirety of wind power plant access can be effectively improved.
Description
Technical field
The present invention relates to electric power system transient stability field, and in particular to large-scale wind power accesses under a kind of weak grid conditions
Transient stability performance Promotion Strategy.
Background technology
The remote conveying electric system that Gansu Power Grid has been formed at present has：" wind-light-electricity ratio is high, sending end load is small, send
End power grid is weak, sends circuit distance outside " several big features, digestion is smaller inside sending end electric network source, relies primarily on and sends circuit outside
Conveying.Under normal operating mode, wind-powered electricity generation randomness, fluctuation have resulted in electric network reactive-load voltage control it is difficult the problems such as.
Since part Wind turbines do not possess low voltage ride-through capability, the Voltage Drops of indivedual wind power plants directly results in grid-connected in substation
Other a large amount of off-grids of wind power plant unit, the problem that influences each other of wind power plant accident is more prominent.The 750kV sent out due to wind-powered electricity generation
Double-circuit line is up to nearly 1000km, belongs to typical light current web frame, and the extensive off-grid of Wind turbines causes system voltage, frequency
Rate fluctuates widely, and directly threatens the safe and stable operation of electric system.The temporary of access light current net is concentrated to wind-powered electricity generation at high proportion
State instability Mechanism is studied, and proposes temporarily steady Promotion Strategy, is the difficult point in research.Wind power plant event in existing Grid-connection standards
It is to be used as assumed condition using forceful electric power net that barrier, which passes through index of correlation,.Therefore providing reactive current only in accordance with power grid standard can not protect
Demonstrate,prove the voltage stability of light current wind power plant off the net.Power grid is weaker, the wind power plant voltage static stability limit and active power transfer pole
Limit smaller.After fault clearance in the transient process of power system restoration, Wind turbines may be temporary because phaselocked loop transient error becomes larger
When it is out of control, from power grid absorbing reactive power.And in recovery process, the equipment such as transformer and interconnected cage motor also can be a large amount of
Absorbed from power grid idle, system is easy to that collapse of voltage phenomenon occurs because of idle unbalance.It is therefore desirable to light current net
The fault traversing performance of lower wind power plant carries out detailed research, and direct-drive permanent-magnetism Wind turbines are domestic mainstream Wind turbines classes
Type, its fault traversing performance is more preferable compared with double-fed type, therefore proposes a kind of idle benefit of transient state based on direct-drive permanent-magnetism Wind turbines
Repay strategy.
The content of the invention
It is proposed weak grid conditions under large-scale wind power access transient stability analysis method, analysis Enhancement of Transient Voltage Stability and temporarily
The reciprocal effect mechanism of state power-angle stability.The general transmission line of light current net is grown, and is resisted greatly in power grid, voltage is vulnerable to voltage-source type
Inverter power changes or the influence of grid disturbance, pair and the synchronous unit output power and the angle stability limit that connect produce shadow
Ring.After generation is disturbed, the active output pulsation of wind turbine is little, so as to not influence the transient state imbalance energy of remaining synchronous unit.
After circuit disturbance excision, it cannot by force be supported along circuit each point voltage, the power generator rotor angle in transient energy function can be caused to slow down
Area reduces, and system stability margin reduces.It is proposed a kind of wind power plant for lifting large-scale wind power access light current net transient stability
Idle control strategy, is divided into 2 aspects of unit and wind power plant：In unit aspect, wind turbine uses idle priority acccess control, becomes in net side
The watt current controlling unit for flowing device output adds Current limited Control；In wind power plant aspect, transient state is calculated not based on transient energy method
Equilibrium energy predicted value, and calculate Transient Voltage Stability nargin, the different directly driven wind-powered idle outputs of unit of adjustment, and by idle tune
Section instruction issuing gives each unit.
The double pwm converters of permanent magnet direct-drive wind power system are when conventional control policy distribution gives birth to transient fault, dc bus electricity
Pressure fluctuating range is larger, control system response speed is slower, and reactive compensation module cannot play ceiling effect, this will not
Beneficial to the safe and stable operation of system.A kind of transient state Measures of Reactive Compensation of directly driven wind-powered unit is proposed, DC voltage is in electricity
Controlled all the time by the pusher side current transformer disturbed from electric network fault before and after net fault disturbance, stability is more preferable；It is active due to exporting
Control with reactive power is completed with net side current transformer, is easy to during fault traversing that it is coordinated to control；The control
Strategy need not increase direct-current unloading circuit.Certain idle, no work value and stability of voltage of wind power plant can be sent after dropping under voltage
Nargin is related so that the fast quick-recovery of voltage, increases synchronous unit retardation area, reduces generator rotor angle head pendulum values, and transmission line impedance increases
After big, by the way of the carried additional control strategy under maximum excision limit time be consistently higher than and do not use additional control strategy
Mode.Asynchronous power supply accounting is high, cause AC system rotatory inertia low.
Brief description of the drawings
Attached drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is light current net equivalent circuit diagram；
Fig. 2 is weak grid conditions transient energy function characteristic curve；
Fig. 3 is directly driven wind-powered unit pusher side current transformer outer shroud control structure figure；In figureFor d shaft current reference values.For
Q axis reference current values.
Fig. 4 is directly driven wind-powered unit net side current transformer outer shroud control structure figure；For stator d axis under active preference strategy
Electric current；For stator q shaft currents under active preference strategy；VgFor set end voltage；For set end voltage reference value；PselFor most
High-power control reference power value；IemaxFor stator current upper limit value；For stator d shaft currents under idle preference strategy；
For stator q shaft currents under active preference strategy.For stator current reference value.
Fig. 5 is light current net simplified model；
Fig. 6 is wind power plant output reactive power under 2 kinds of methods of operation；
Fig. 7 is 2 kinds of method of operation Down Highway b1 voltages；
Fig. 8 is the power-angle curve of fired power generating unit G1 under two kinds of methods of operation；
Fig. 9 is the output power of fired power generating unit G1 under two kinds of methods of operation；
Figure 10 is patent flow diagram.
Embodiment
Light current net and forceful electric power Netcom are often defined division according to short-circuit ratio (SCR), it is considered that SCR values are more than 20~25
When power grid be forceful electric power net, power grid when SCR values are less than 6~10 is light current net, and following formula is the calculation formula of SCR.
SnFor the rated capacity of power grid；SSCFor capacity of short circuit；UgFor wind power plant exit potential；XZFor line impedance；PGFor wind
Electric field capacity.
Light current net generally has two aspect features：
1st, transmission line is grown, and causes to resist in power grid big；
2nd, asynchronous power supply accounting is high, causes AC system rotatory inertia low.Meet that any of the above point can be referred to as weak
Power grid.
The corresponding electric network impedance of light current net is usually relatively low, and induction reactance changes greatly, and transmission line is suffered to disturb larger, long transmission line
Anti- increase, system in power grid is set to die down, points of common connection voltage is subject to voltage source type converter changed power or grid disturbance
Influence, be not constant basis.Blower fan control system influences power output so as to influence PCC voltages, and the change of PCC voltages again can shadow
Ring the stability to blower fan control system.Mouse cage Wind turbines and double-fed fan motor unit are compared, directly driven wind-powered unit uses full work(
Rate back-to-back converter, can provide the capacity support of bigger for output reactive power.When wind power plant is outwards defeated by light current net
When sending power, Wind turbines voltage stability margin changes with the change of grid strength.Ignore line resistance, can obtain wind turbine
The transmission formula of the active P and idle Q of group is
P=(VgUgsinθwt)/X
VgFor Wind turbines set end voltage, θwtFor voltage phase angle, X is line impedance.
In formula, X is the sum of wind power plant current collection line impedance and electric network impedance.By θwtCancellation can obtain
Define Wind turbines voltage stability margin
In Model for Stability Calculation of Power System, operation equation and the power-angle curve such as following formula of synchronous unit.But scene access
The generator rotor angle of synchronous machine set system, voltage can be had an impact, since wind-powered electricity generation, photovoltaic are nearly free from acceleration energy in transient process
Amount, and fired power generating unit can provide very big acceleration energy.
ω is the deviation of rotor velocity and synchronous speed, and δ is rotor angle, PmFor mechanical output, PeFor electromagnetic power, XZFor
The total reactance of system, M are generator inertia time constant.
System is in stable state δ=δ0, load angle characteristic isInitial launch point is δ0, after a line short is grounded, work(
Angle characteristic is changed intoRotor angle δ increases, and runs to δcWhen faulty line cut off, power-angle curve is changed intoRotor is opened at this time
Begin to slow down, δuCorresponding maximum deceleration area, δcIt is corresponding to accelerate area, if maximum deceleration area, which is more than, accelerates area, system work(
Stablize by vibration is final in δ=δ at angles.After wind power integration system, the node voltage of synchronization system, load angle characteristic is caused to occur
Change.Angle stability problem is not present in Wind turbines, and after generation is disturbed, the active output pulsation of wind turbine is little, so as to not influence
The transient state imbalance energy of remaining synchronous unit.Due to being accessed in extensive wind turbine in weak power grid environment, after circuit disturbance excision,
It cannot by force be supported along circuit each point voltage, retardation area can be caused to be contracted to A, reduce stability margin.So cut in disturbance
After removing, it should also be compensated in right amount idle, to increase retardation area.And the generator rotor angle dynamic behaviour of synchronous unit is by rotor motion
Equation uniquely determines that the physical location of rotor is strictly corresponding with generator rotor angle.
A kind of transient state Measures of Reactive Compensation of directly driven wind-powered unit is proposed, certain nothing can be sent after dropping under voltage
Work(, according to idle so that the fast quick-recovery of voltage, increases synchronous unit retardation area, reduce generator rotor angle head pendulum values, transmission line impedance
After increase, by the way of the carried additional control strategy under maximum excision limit time be consistently higher than and do not use additional control plan
Mode slightly.Fig. 6 is the permanent magnet direct-drive wind turbine group Novel Control figure proposed, wherein pusher side current transformer control DC capacitor
Voltage and generator unit stator alternating voltage, and net side current transformer realizes maximal power tracing and system side is idle and voltage controls.
DC voltage is controlled by the pusher side current transformer disturbed from electric network fault all the time before and after electric network fault disturbance, and stability is more preferable；
Completed due to exporting the active control with reactive power with net side current transformer, be easy to coordinate it during fault traversing
Control.Wind power plant is and general with wind-powered electricity generation field voltage maximum stable by calculating the voltage stability margin of every directly driven wind-powered unit
Rate is object function, calculates the maximum reactive-load compensation amount of every unit.
To maintain DC voltage stability, pusher side current transformer outer shroud is controlled using DC voltage control and stator voltage.According to
The deviation of DC bus-bar voltage, direct current pressure ring adjust output motor stator watt current reference instruction using PI controllersThe electromagnetic power P for exporting PMSG adjust automaticalliessActive P is exported with net sidegIt is equal, and then by the injustice of DC side power
Weighing apparatus is converted into the mechanical output P of PMSGmWith electromagnetic power PsImbalance, i.e., by the DC voltage ripple caused by capacitor charging/discharging
Turn turns to the fluctuation of speed caused by PMSG kinetic energy changes.The control strategy can effectively suppress DC voltage during grid voltage sags
Fluctuation, realize the low voltage crossing of PMSG Wind turbines, and external hardware circuit and additional DC voltage need not be increased
Controlling unit.
Net side current transformer is by judging network voltage VgRealize that net side is active and the coordination of reactive power controls.When power grid electricity
When positive pressure is normal, for active preferential maximal power tracing control, i.e., when to active and reactive current amplitude limit, meet first active
Electric current；When network voltage falls, using idle priority acccess control, add in the watt current controlling unit of net side current transformer output
Enter Current limited Control, prevent the mutation of the caused DC bus capacitor charging and discharging currents of watt current mutation, thus effectively suppress because
The fluctuation of DC voltage caused by the switching of net side current transformer operating mode.
Wind turbines are to provide system certain reactive power support during Voltage Drop, it is impossible to make grid entry point voltage
Rated value is returned to, is no longer controlled using PI, but the nothing of net side current transformer is adjusted according to stability of voltage of wind power plant Limiting Level K
Work(electric current, improves Voltage Drop situation.Wind turbines are by the data transfers such as itself output voltage to wind power plant control in transient process
System processed, wind power station control system are carried out by calculating in wind power plant the transient voltage unstability nargin of different directly driven wind-powered units
Optimization calculates, and adjusts the Reactive Compensation Mode and compensation rate of each unit so that pusher side control system quickly responds, fully profit
With the transient state control ability of directly driven wind-powered unit itself.
The dynamic reactive electric current of separate unit direct-drive permanent-magnetism Wind turbines injection electric system is following formula in Voltage Drop, Iq≥
1.3×(0.9-K)IN, INFor wind power plant rated current, IqFor reactive current.Reactive current during idle priority acccess control is according to upper
Formula is calculated.
Transient stability emulation is carried out in simple light current wind turbine off the net, emulation uses power system analysis software PSASP, benchmark
Power is 100MW.Infinite bus power system model is established, as shown in figure 5, system accesses big system by step-up transformer by long transmission line
System.Systematic parameter：B1 busbar voltages are 38.5KV, and b2 busbar voltages are 230KV, and the specified active power output of unit G1, G2 is 80MW,
Transformer 1,2 impedance of transformer are 0.001+0.02j, and 3 impedance of transformer is 0.002+0.04j, circuit Z1, Z2 impedance 0.008+
0.1j.B1 is points of common connection.It is 2.32 to be computed capacity of short circuit, meets that light current net defines condition.
Directly driven wind-powered unit model is established, synchronous unit is consideration E "q、E″d、E′q5 rank models of potential change.Consider 2
The kind method of operation：
Mode 1：G1 is the fired power generating unit that installed capacity is 80MW.G2 be contribute be 80MW wind power plant, by 40 2MW's
Straight drive blower composition, does not use carried additional control strategy.Wind turbines exit potential is 0.69KV.
Mode 2：G1 is the fired power generating unit that installed capacity is 80MW.G2 be contribute be 80MW wind power plant, by 40 2MW's
Straight drive blower composition, using carried additional control strategy.
According to《Guiding rules of power system safety and stability》The regulation of first order safety and stability standard, calculates the fault set master taken
To be element N-1 failures.Three phase short circuit fault occurs at 1 second at a loop line road 50%, faulty line three-phase tripping at 1.2 seconds,
Single loop line is run afterwards.The system transient modelling response of two kinds of situations is as shown below.
Generator terminal three-phase voltage falls during failure, and directly driven wind-powered unit enters low voltage crossing pattern, and Fig. 6, Fig. 7 are
Wind power plant exports idle and b1 busbar voltages under 2 kinds of methods of operation.After failure removal, since light current net voltage support is weak, voltage
Recover slower.Injected by net side current transformer it is idle, using add idle control strategy straight drive blower failure generation after send out
Go out idle amount and be more than synchronous unit, so voltage rise is very fast.
The power-angle curve of synchronous unit G1 represents influence of two kinds of different energy sources types to power grid in the case of above-mentioned two kinds.
Fig. 8, Fig. 9 are the generator rotor angle response and active power output response of G1 fired power generating units.Two times voltages of mode recover very fast after failure removal,
Voltage transient performance is more preferable.Since synchronous unit G1 output powers are directly proportional to the product of voltage, it is active output ramp-up rate compared with
Mode one is faster.The active output of G2 units is higher than mode one in first rolling period.From law of equal areas, mode two
G1 synchronizations unit accelerate area to be more than mode one, power-angle oscillation amplitude is less than mode one, and generator rotor angle first, which is put, under two kinds of modes divides
Wei not be 61.63 °, 47.04 °.Wind power plant can produce wholesome effect after using additional control strategy to generator rotor angle.
Gradually increase line impedance respectively, calculate the maximum mute time.From the results, it was seen that the increasing with line impedance
Adding, the maximum mute time is in monotonous decreasing trend under two kinds of modes, and during the situation maximum excision of use additional control strategy
Between it is less.
The maximum mute time under the different line impedances of table 1
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of Reactive Compensation in Wind Farm control strategy for lifting large-scale wind power access light current net transient stability, its feature exist
In step has：
1) strategy is divided into 2 aspects of unit and wind power plant：In unit aspect, when network voltage falls, using idle preferential
Control, adds Current limited Control in the watt current controlling unit of net side current transformer output, prevents caused by watt current mutation
The mutation of DC bus capacitor charging and discharging currents, so as to effectively suppress the direct current because caused by switching net side current transformer operating mode
The fluctuation of pressure；
2) in unit aspect, according to the deviation of DC bus-bar voltage, direct current pressure ring proportion of utilization integration (PI) controller is adjusted
Output motor stator watt current reference instructionDC voltage is before and after electric network fault disturbance all the time by from electric network fault
The pusher side current transformer control of interference, the control of active power of output are completed in net side current transformer, are easy in fault traversing process
In it is coordinated to control；
3) in wind power plant aspect, the general transmission line length of light current net, causes in power grid to resist greatly, specified electricity is run according to wind power plant
Pressure, real time execution power and line impedance, according to the definition of light current net, calculate short-circuit ratio；The system should also include a distant place and believe
Measuring unit is ceased, wind power plant centralized control system is sent with wind turbine unit for bi-directional data；Controller is arranged on wind field by integrated control platform
Near booster stations, power grid local measurement information includes boosting busbar voltage, and it is idle steady to calculate transient state according to metrical information for controller
Determine nargin, send the idle control signal of transient state, control signal is sent to wind turbine by rapid field bus, realizes wind field machine
The idle quick regulation of group；
4) angle stability problem is not present in Wind turbines, and after excision is disturbed, the active output pulsation of wind turbine is little, so as to not influence
The transient state imbalance energy of remaining synchronous unit；In electric system be equipped with containing synchronous phasor measurement unit, wide area measurement system
System, need to measure the conventional synchronous generator's power and angle that measurement wind field closes on；According to EEAC methods etc. in failure time-continuing process
Value calculates the synchronous unit that closes on of light current net Wind Field and accelerates area, after fault clearance due in light current net voltage it is unstable,
The predicted value J of transient state imbalance energy is calculated by transient energy methodf；According to the friendship of wind power plant and electric system in the system
Mutually, then additional control to wind turbine will be decomposed into the Power Control of wind power plant；The Reactive-power control of wind power plant is instructed by supervising
Control system produces and is assigned to each unit, then is realized by each unit own control systems；
5), cannot be strong along circuit each point voltage after circuit disturbance excision due to being accessed in extensive wind turbine in weak power grid environment
Support, so after disturbance is cut off, should also be compensated idle, to prevent reactive-load compensation amount excessively caused wind power plant in right amount
Exit potential jumps；The active power and reactive power that every directly driven wind-powered unit is sent in measurement transient process, according to the above
Step calculates the Transient Voltage Stability nargin of separate unit Wind turbines, is uploaded to wind power station control system, wind power plant control system
System calculates the idle amount that every separate unit permanent magnet direct-drive wind turbine group sends according to the voltage stability margin of every unit, wind power plant
The instruction of active and Reactive-power control is produced by monitoring system and is assigned to each unit.
2. large-scale wind power accesses transient stability performance Promotion Strategy under a kind of weak grid conditions according to claim 1,
It is characterized in that,
Pusher side current transformer control DC capacitor voltage and generator unit stator alternating voltage in step 1), and net side current transformer is realized most
High-power tracking and system side is idle controls with voltage；DC voltage is before and after electric network fault disturbance all the time by from electric network fault
The pusher side current transformer control of interference, stability are more preferable；Due to exporting the active and control of reactive power with net side current transformer
Complete, be easy to during fault traversing that it is coordinated to control；The control strategy need not increase direct-current unloading circuit.
3. large-scale wind power accesses transient stability performance Promotion Strategy under a kind of weak grid conditions according to claim 1,
It is characterized in that,
Bilateral controller exchanges terminal voltage orientation with current transformer using double circle structure and realizes decoupled active and reactive in step 2)
Control；Pusher side controller outer shroud controls UdcAnd Vg, UdcFor DC voltage, VgFor set end voltage,Joined by DC voltage
Value amendment link is examined to give,For direct voltage reference value；Pusher side current limit link uses active preference strategy, first with
Active outer shroud PI controllers outputObtain the reference value of watt current
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<mi>f</mi>
</mrow>
<mo>*</mo>
</msubsup>
<mo>></mo>
<msubsup>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
<mo>*</mo>
</msubsup>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<msubsup>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
<mo>*</mo>
</msubsup>
</mrow>
</mtd>
<mtd>
<mrow>
<msubsup>
<mi>I</mi>
<mrow>
<mi>e</mi>
<mi>d</mi>
<mi>r</mi>
<mi>e</mi>
<mi>f</mi>
</mrow>
<mo>*</mo>
</msubsup>
<mo><</mo>
<mo>-</mo>
<msubsup>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
<mo>*</mo>
</msubsup>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
For maximum current value,For the effective reference value of watt current,For watt current reference value.
4. large-scale wind power accesses transient stability performance Promotion Strategy under a kind of weak grid conditions according to claim 1,
It is characterized in that,
It is equivalent by the system under more each mode in power system transient stability Journal of Sex Research under carrying out disconnection fault in step 3)
Kinetic energy analyzes the power system transient stability under each mode；The accelerating power of leading image is represented by Pac
<mrow>
<msub>
<mi>P</mi>
<mrow>
<mi>a</mi>
<mi>c</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>M</mi>
<mi>a</mi>
</msub>
<msub>
<mi>&Delta;P</mi>
<mi>s</mi>
</msub>
<mo>-</mo>
<msub>
<mi>M</mi>
<mi>s</mi>
</msub>
<msub>
<mi>&Delta;P</mi>
<mi>a</mi>
</msub>
</mrow>
<mrow>
<msub>
<mi>M</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<msub>
<mi>M</mi>
<mi>a</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Ma=∑ Mj
Ms=∑ Mj
In formula, MiFor the inertia of i-th operation fired power generating unit in disturbed serious group, MjThermoelectricity group is run for jth platform in remaining group
Inertia；Ms、MaRespectively disturbed serious group and the equivalent inertia of remaining group's unit；ΔPs、ΔPaRespectively disturbed serious group and remaining
Lower group accelerating power；The predicted value of transient state imbalance energy
<mrow>
<msub>
<mi>V</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msup>
<mi>M&omega;</mi>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>p</mi>
<mo>/</mo>
<mi>c</mi>
</mrow>
</msub>
<mo>=</mo>
<msubsup>
<mo>&Integral;</mo>
<msub>
<mi>&delta;</mi>
<mi>s</mi>
</msub>
<msub>
<mi>&delta;</mi>
<mi>c</mi>
</msub>
</msubsup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>P</mi>
<mi>e</mi>
<mn>3</mn>
</msubsup>
<mo>-</mo>
<msub>
<mi>P</mi>
<mi>m</mi>
</msub>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>&delta;</mi>
</mrow>
M is synchronous unit inertia time constant, and ω is synchronous unit rotor rotating speed, and δ is synchronous unit generator rotor angle, VkFor system kinetic energy,
Vp/cFor potential energy of system.
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| CN111509773B (en) * | 2020-04-24 | 2021-08-17 | 浙江运达风电股份有限公司 | Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid |
| CN111509773A (en) * | 2020-04-24 | 2020-08-07 | 浙江运达风电股份有限公司 | Voltage source type wind turbine generator fault ride-through control method suitable for weak power grid |
| CN112260314A (en) * | 2020-10-15 | 2021-01-22 | 山东大学 | Phase-locked synchronous stable control method and system during fault ride-through period of wind turbine generator |
| CN112557813A (en) * | 2020-11-26 | 2021-03-26 | 国网宁夏电力有限公司电力科学研究院 | Method for judging voltage stability of power grid under simultaneous fault of multiple loops of direct current |
| CN112881822A (en) * | 2021-01-07 | 2021-06-01 | 国网河北省电力有限公司电力科学研究院 | Method and device for detecting voltage control function of wind power plant |
| CN113241748A (en) * | 2021-04-25 | 2021-08-10 | 中国电力科学研究院有限公司 | Transient overvoltage suppression method and system for power electronic converter connected to weak power grid |
| CN113241748B (en) * | 2021-04-25 | 2023-06-06 | 中国电力科学研究院有限公司 | Method and system for suppressing transient overvoltage of power electronic converter accessing weak power grid |
| CN114069727A (en) * | 2021-11-22 | 2022-02-18 | 山东大学 | Converter control switching method and system for flexible interconnected power distribution network |
| CN114069727B (en) * | 2021-11-22 | 2024-03-26 | 山东大学 | Converter control switching method and system for flexible interconnection power distribution network |
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