CN104779644B - Wind power plant grid connection stability assessment method - Google Patents

Wind power plant grid connection stability assessment method Download PDF

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CN104779644B
CN104779644B CN201510226969.5A CN201510226969A CN104779644B CN 104779644 B CN104779644 B CN 104779644B CN 201510226969 A CN201510226969 A CN 201510226969A CN 104779644 B CN104779644 B CN 104779644B
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wind
grid
oscr
short circuit
stability assessment
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CN104779644A (en
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唐彬伟
赵亮
随德光
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Beijing Tianyuan Science and Creation Wind Power Technology Co Ltd
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Beijing Tianyuan Science and Creation Wind Power Technology Co Ltd
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    • H02J3/386—
    • 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

Abstract

The invention relates to a wind power plant grid connection stability assessment method which comprises the following steps that data collecting and storing are carried out, wherein bus voltage, active power and passive power on a main transformer low-voltage side are collected and stored; the short circuit capacity Skosc of system operation is computed; power grid stability assessment is carried out, OSCR is set to be the wind power plant operation short circuit capacity ratio at a k moment, n is a unit number in a wind power plant, Pd is the rated capacity of a single wind generating set, Pt = n * Pd, when 3 ≥ OSCR ＞ n1, the control parameter of automatic passive compensation equipment is adjusted, when n1 ≥ OSCR ＞ n2, the control parameter of a full-power converter is adjusted, when n2 ≥ OSCR, the number of simultaneous grid-connection units is reduced, the value of n1 is between 2 and 3, and the value of n2 is according to the IEEE Std1204-1997 standard. The operation state of a power grid can be detected in time, related measures can be carried out in time, and loss is reduced.

Description

A kind of wind farm grid-connected stability assessment method
Technical field
The present invention relates to wind farm grid-connected technical field, more particularly to a kind of wind farm grid-connected stability assessment method.
Background technology
With being on the rise for energy crisis, regenerative resource is greatly developed, and global installed capacity of wind-driven power is with average every Year, the speed higher than 20% increased, and wind-power electricity generation has become the industry with considerable scale.The cut-off end of the year in 2013, global wind The accumulative installed capacity of power generating has reached 3.18 hundred million kilowatts, is provided with more than 300 wind energy turbine set altogether.Large-scale wind power field directly connects Entering electrical network causes wind-power electricity generation electricity proportion in electrical network increasing, while being that power system brings opportunity to develop, Also new challenge is brought to all many-sides such as its safe and stable operation and scheduling controlling.
With the development of blower fan interconnection technology, increasing blower fan manufacturer employs the grid-connected side of full power convertor Formula, and reactive-load compensation equipment also adopts SVC and SVG in wind energy turbine set.Full power convertor and SVC and SVG belong to FACTS and set Standby, D.C. high voltage transmission is there are certain requirements to grid-connected Short circuit ratios.Easily there is electrical network in the little system of Short circuit ratios to shake Swing, dynamic over-voltage, resonance the problems such as, these grid failure states all will affect blower fan normal operation.Particularly electrical network vibration, Not only make blower fan quote disorderly closedown, affect the availability of unit, even influence whether in unit in the area for vibrating serious Electrical equipment and booster stations a secondary device.Although capacity of short circuit and the wind-powered electricity generation of system can be obtained by simulation calculation The grid-connected Short circuit ratios in field, but the accuracy of simulation result depends on the accuracy of phantom.Current large-scale power system There is no the full power convertor wind energy turbine set set grid-connection model of maturation in electromechanical transient simulation software, have impact on result Accuracy.And the method for operation of power system is time changing, as the short circuit of the change wind energy turbine set of system operation mode is held Amount can change therewith than also, it is impossible to quantitatively know the Short circuit ratios of current wind farm grid-connected access.
In addition, 101349731 B of patent CN also refer to a kind of real time evaluating method of voltage stability, the patent lacks Point is the accuracy that its accuracy for being previously mentioned method depends on system model, and wind energy turbine set generally can not possibly also obtain electrical network number. Therefore the method is can be applied only in dispatching of power netwoks, it is impossible to is implemented at wind energy turbine set end, and judges stability only with circuit Trend index as performance assessment criteria, not in view of the effect of full power convertor and the grid-connected Short circuit ratios of SVC, SVG.
As can be seen here, a kind of above-mentioned existing real time evaluating method of voltage stability is in use, it is clear that exist inconvenience with Defect, and be urgently further improved.How to found one kind to be applied in wind energy turbine set, based on on-line operation data to wind-powered electricity generation The Short circuit ratios of field grid integration are calculated, and assess a kind of wind farm grid-connected stable of wind farm grid-connected stability accordingly Property appraisal procedure, one of current important research and development problem of real category.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of wind farm grid-connected stability assessment method so as to can be timely It was found that the running status of electrical network, reduces loss beneficial to taking measures on customs clearance in time, so as to overcome the deficiencies in the prior art.
For solving above-mentioned technical problem, a kind of wind farm grid-connected stability assessment method of the present invention is comprised the following steps：Number According to collection and storage, gather busbar voltage, active power and the reactive power of main transformer low-pressure side and store；Calculate capacity of short circuit, The k moment is set in, the equivalent potential of system is Ek=Ekx+jEky, equiva lent impedance is Zk=Rk+jXk, wind energy turbine set main transformer low-pressure side Current/voltage amplitude is Vk, active power bears as Pk, reactive power bears as Qk, the capacity of short circuit of system operation is Skosc；If The k-1 moment is scheduled on, the equivalent potential of system is Ek-1=E(k-1)x+jE(k-1)y, the equiva lent impedance of system is Zk-1=Rk-1+jXk-1, The current/voltage amplitude of wind energy turbine set main transformer low-pressure side is Vk-1, active power bears as Pk-1, reactive power bears as Qk-1, then during k Etching system runs capacity of short circuit：
Wherein,
Grid stability is assessed, and is made OSCR for k moment wind energy turbine set and is run Short circuit ratios, and n is unit number in wind energy turbine set, Pd For single wind generator group rated capacity, then have：
Pt=n × Pd
As 3 >=OSCR ＞ n1When, the control parameter of auto-reactive compensation equipment is adjusted, works as n1>=OSCR ＞ n2When, adjustment is complete The control parameter of power converter, works as n2During >=OSCR, the number of units of grid-connected unit simultaneously, the n are reduced1Value between 2-3, n2Value refers to IEEE Std 1204-1997 standards.
It is as a modification of the present invention, describedMiddle Rk=0.
The collection is completed by wind energy turbine set electrical secondary system protective relaying device.
The storage is completed by data center.
The data of the collection are transmitted to storage device by ether net mode.
After such design, the present invention at least has advantages below：
The present invention obtains the system operation capacity of short circuit of main transformer low-pressure side in wind energy turbine set using wind energy turbine set on-line operation data, And operation Short circuit ratios are obtained using the system operation capacity of short circuit, for judging wind farm grid-connected stability, and made with this For the foundation that blower fan full power convertor and auto-reactive compensation equipment control parameter are changed.Can be found in time using the present invention The running status of electrical network, is conducive to reduction loss of taking measures on customs clearance in time.
Description of the drawings
Above-mentioned is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention, below With reference to accompanying drawing, the present invention is described in further detail with specific embodiment.
Fig. 1 is a kind of calculation flow chart of wind farm grid-connected stability assessment method of the present invention.
Fig. 2 is that capacity of short circuit of the present invention calculates equivalent circuit diagram.
Specific embodiment
Refer to shown in Fig. 1, the present invention proposes a kind of wind farm grid-connected stability assessment method, using on-line operation data The system operation capacity of short circuit of main transformer low-pressure side in wind energy turbine set is obtained, and system operation is obtained using the system operation capacity of short circuit Short circuit ratios are used for judging wind farm grid-connected stability, and in this, as full power convertor and auto-reactive compensation equipment control The foundation of parameter modification processed.Present invention is generally directed to wind energy turbine set, include in wind energy turbine set chopper, collection electric line, case change, main transformer, Using the grid-connected wind power generating set of full power convertor, auto-reactive compensation equipment SVC/SVG etc..
1st, Data acquisition and storage
Specifically, the collection and storage of electric network data, is the real-time transient grid data to wind energy turbine set main transformer low-pressure side It is acquired and stores.Specifically by the main transformer low-pressure side busbar voltage of wind energy turbine set electrical secondary system protective relaying device collection, master Low pressure side active power and reactive power are transmitted to data center using IEC61850 communication protocols by ether net mode Row storage.
2nd, calculate capacity of short circuit
Refer to shown in Fig. 2, the equivalent potential of system is E=Ex+jEy；The equiva lent impedance of system is Z=R+jX；Wind energy turbine set The voltage magnitude of main transformer low-pressure side is V；The active power of wind energy turbine set main transformer low-pressure side is born as P；Wind energy turbine set main transformer low-pressure side Reactive power is born as Q；The capacity of short circuit of system operation is Sosc。
2.1st, at the k moment：
The equivalent potential of system is Ek=Ekx+jEky；The equiva lent impedance of system is Zk=Rk+jXk；Wind energy turbine set main transformer low-pressure side Voltage magnitude be Vk；The active power of wind energy turbine set main transformer low-pressure side is born as Pk；The reactive power of wind energy turbine set main transformer low-pressure side Bear as Qk；The capacity of short circuit of system operation is Skosc。
Obtain
I.e.：
2.2nd, at the k-1 moment：
The equivalent potential of system is Ek-1=E(k-1)x+jE(k-1)y, the equiva lent impedance of system is Zk-1=Rk-1+jXk-1, wind-powered electricity generation The current/voltage amplitude of field main transformer low-pressure side is Vk-1, active power bears as Pk-1, reactive power bears as Qk-1, obtain
Make k moment and k-1 moment：
Solve Ekx、Eky、Rk、Xk, simultaneous (2-2), (2-3), (2-4) equation have：
| H |=(- VkQ(k-1)+V(k-1)Qk)2+(VkP(k-1)-V(k-1)Pk)2
| B |=VkV(k-1)(V(k-1)-Vk)(QkQ(k-1)+Q(k-1)Pk)
Obtain：
K moment system operation capacities of short circuit are：Generally high pressure disregards Rk, then have：
3rd, grid stability assessment
Making OSCR and Short circuit ratios being run for k moment wind energy turbine set, n is unit number in wind energy turbine set, PdFor separate unit wind-power electricity generation Unit rated capacity, then have：
Pt=n × Pd (3-2)
According to IEEE Std 1204-1997 standards, when OSCR >=3 are forceful electric power net；When 3 ＞ OSCR ＞ 2 are light current net；When OSCR≤2 are to bear light current net.
Therefore as 3 >=OSCR ＞ n1When output blue early warning, now should be noted SVC or SVG auto-reactive compensation equipment controls Parameter processed and operation of power networks parameter matching performance problem, timely adjusting device control parameter；Work as n1>=OSCR ＞ n2When export orange pre- It is alert, now should be noted that blower fan full power convertor control parameter matches sex chromosome mosaicism, timely adjusting device control ginseng with electrical network parameter Number；Work as n2Output red early warning during >=OSCR, has now been unfavorable for wind farm grid-connected operation, it is proposed that reduce grid-connected unit simultaneously Number of units.
The n1Value between 2-3, n2Value refers to IEEE Std 1204-1997 standards.In the present embodiment, wind-powered electricity generation Field main transformer low-pressure side voltage takes 35kV, according to engineering experience n1Preferably 2.5, with reference to IEEE Std 1204-1997 standards n2For 2。
The problems such as OSCR little electrical network easily occurs electrical network vibration, dynamic over-voltage, resonance, these grid failure states are all by shadow Ring the normal operation of blower fan, and damage in wind energy turbine set once, secondary device, operation of power networks can be found in time using the present invention State, and reduction loss of taking measures on customs clearance in time.
The above, is only presently preferred embodiments of the present invention, not makees any pro forma restriction to the present invention, this Art personnel make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within this In bright protection domain.

Claims (5)

1. a kind of wind farm grid-connected stability assessment method, it is characterised in that comprise the following steps：
Data acquisition and storage, gathers busbar voltage, active power and the reactive power of main transformer low-pressure side and stores；
Calculate capacity of short circuit,
The k moment is set in, the equivalent potential of system is Ek=Ekx+jEky, equiva lent impedance is Zk=Rk+jXk, wind energy turbine set main transformer low pressure The voltage magnitude of side is Vk, active power amplitude is Pk, reactive power amplitude is Qk, the capacity of short circuit of system operation is Skosc,
The k-1 moment is set in, the equivalent potential of system is Ek-1=E(k-1)x+jE(k-1)y, the equiva lent impedance of system is Zk-1=Rk-1+ jXk-1, the voltage magnitude of wind energy turbine set main transformer low-pressure side is Vk-1, active power amplitude is Pk-1, reactive power amplitude is Qk-1,
Then k moment system operations capacity of short circuit is：
S k o s c = | E k 2 Z k | = | ( E k x + jE k y ) 2 R k + jX k |
Wherein,
A = V k 2 0 - P k Q k 0 V k - Q k - P k V ( k - 1 ) 2 0 - P ( k - 1 ) Q ( k - 1 ) 0 V ( k - 1 ) - Q ( k - 1 ) - P ( k - 1 ) , B = V k V k 2 - P k Q k 0 0 - Q k - P k V ( k - 1 ) V ( k - 1 ) 2 - P ( k - 1 ) Q ( k - 1 ) 0 0 - Q ( k - 1 ) - P ( k - 1 ) ,
C = V k 0 V k 2 Q k 0 V k 0 - P k V ( k - 1 ) 0 V ( k - 1 ) 2 Q ( k - 1 ) 0 V ( k - 1 ) 0 - P ( k - 1 ) , D = V k 0 - P k V k 2 0 V k - Q k 0 V ( k - 1 ) 0 - P ( k - 1 ) V ( k - 1 ) 2 0 V ( k - 1 ) - Q ( k - 1 ) 0 ;
Grid stability is assessed, and is made OSCR for k moment wind energy turbine set and is run Short circuit ratios, and n is unit number in wind energy turbine set, PdFor list Platform wind power generating set rated capacity, then have：
O S C R = S k o s c P t
Pt=n × Pd
As 3 >=OSCR ＞ n1When, the control parameter of auto-reactive compensation equipment is adjusted, works as n1>=OSCR ＞ n2When, adjust total power The control parameter of current transformer, works as n2During >=OSCR, the number of units of grid-connected unit simultaneously, the n are reduced1Value between 2-3, n2Take It is worth for 2.
2. a kind of wind farm grid-connected stability assessment method according to claim 1, it is characterised in that describedMiddle Rk=0.
3. a kind of wind farm grid-connected stability assessment method according to claim 1, it is characterised in that the collection is by wind Electric field electrical secondary system protective relaying device is completed.
4. a kind of wind farm grid-connected stability assessment method according to claim 1, it is characterised in that the storage is by counting Complete according to center.
5. a kind of wind farm grid-connected stability assessment method according to claim 1, it is characterised in that the number of the collection According to being transmitted to storage device by ether net mode.
CN201510226969.5A 2015-05-06 2015-05-06 Wind power plant grid connection stability assessment method Active CN104779644B (en)

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CN104967152B (en) * 2015-07-17 2017-11-28 华中科技大学 A kind of voltage stability appraisal procedure of more feed-in AC/DC mixed power systems
CN110297150B (en) 2018-03-21 2020-10-23 北京金风科创风电设备有限公司 Wind generating set grid-connected point short circuit capacity detection method and device
CN109687516A (en) * 2018-12-28 2019-04-26 阳光电源股份有限公司 Control of Power Plant method, controller and electric power station system
CN109672191A (en) * 2019-01-21 2019-04-23 华北电力大学 The screening technique of large-scale wind power field collection region sub-synchronous oscillation risk
CN113315164B (en) * 2020-12-09 2023-03-03 北京金风科创风电设备有限公司 Reactive voltage control method and device, medium and computing device
CN112821379A (en) * 2020-12-31 2021-05-18 天津瑞能电气有限公司 Weak-grid type wind power plant power grid impedance estimation and parameter adaptive matching method

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WO2013185772A2 (en) * 2012-06-12 2013-12-19 Vestas Wind Systems A/S Wind-power-plant control upon low-voltage grid faults
DE102012212777A1 (en) * 2012-07-20 2014-01-23 Wobben Properties Gmbh Method for controlling a wind farm
CN104362678B (en) * 2014-11-21 2016-08-24 国家电网公司 A kind of wind energy turbine set accesses the analysis method to local electric network influencing counter-measure

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