NZ621182B2 - Method for operating a wind energy installation - Google Patents
Method for operating a wind energy installation Download PDFInfo
- Publication number
- NZ621182B2 NZ621182B2 NZ621182A NZ62118212A NZ621182B2 NZ 621182 B2 NZ621182 B2 NZ 621182B2 NZ 621182 A NZ621182 A NZ 621182A NZ 62118212 A NZ62118212 A NZ 62118212A NZ 621182 B2 NZ621182 B2 NZ 621182B2
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- New Zealand
- Prior art keywords
- feed
- wind
- network
- measurement
- electric
- Prior art date
Links
- 238000009434 installation Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 65
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 230000001419 dependent effect Effects 0.000 claims description 7
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 230000012447 hatching Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
-
- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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 present invention comprises a method for feeding electrical power to an electrical grid (10), wherein the feed to the electrical grid (10) is produced by means of at least one wind energy installation (32) with a first feed arrangement (WP1, WP2) at a feed point, and the feed is produced depending on electrical variables in the grid (10), and measured values for the electrical variables or measured values for determining the electrical variables are detected at measurement times at predetermined time intervals, and wherein the measurement times are synchronised with an external time signal available outside the first feed arrangement. ng on electrical variables in the grid (10), and measured values for the electrical variables or measured values for determining the electrical variables are detected at measurement times at predetermined time intervals, and wherein the measurement times are synchronised with an external time signal available outside the first feed arrangement.
Description
Method for operating a wind energy installation
The present invention concerns a method of feeding electric power
into an electric network, in ular using one or more wind power
installations. The invention further ns a wind power installation as
well as a wind park and also a wind park arrangement with a plurality of
wind parks.
Methods of feeding electric power, in particular by means of wind
power installations, into an electric network, are generally known. In
addition to purely feeding the available energy — or power when a snapshot
is considered —- into the network, such methods for feeding power into the
network can and often have to also take account of ons involving
networks stabilisation. Expressed in simplified terms, it can be provided
that, in dependence on the voltage in the network to be fed into,
hereinafter referred to for simplicity as the network, more or less power
and/or more or less reactive power is to be fed in, to give just some
examples. The network voltage, that is to say the amplitude of the electric
voltage in the network, in particular an effective value of that voltage, can
be an important parameter to implement in dependence thereon the
network stabilisation measures.
For example, international ation WO 02/086315 A1 discloses a
k voltage—dependent phase angle tion and thus a voltage-
dependent feed of reactive power. The German patent application laid
open as laid—open application DE 19 756 777 A1 discloses a network
voltage—dependent. power regulation which alters the fed—in power in
dependence on the network voltage.
By virtue of the wide dissemination of decentral feed—in tuses
like wind power installations or wind parks with a plurality of wind power
installations, the problem which arises is that a number of installations wish
to implement k support independently of each other, in accordance
with the same ication. That can have the effect that an installation
seeks to compensate for the achieved effect of providing support by
another installation. The probiem occurs in particular when ters in
the network, in particular the network e, are subject to slight
fluctuations, that is to .say in particular fluctuate somewhat in amplitude
and by coincidence one of the installations quoted by way of example
rather detects a lower value in respect of the voltage fluctuations and
another installation rather detects a higher value in respect of the
fluctuations. In that case the installation which detects a value that tends
to be lower is inclined towards ting measures for sing the
voltage whereas the installation which tends to detect a higher value is
ed towards ting measures for ng the voltage. In that way
the lations can operate against each other. At least the situation can
occur, where some network support operations are effected only by one
installation, and the other installation makes little or no contribution.
When using a wind park that problem can be resolved by the wind
power installations being centrally controlled insofar as they receive a for
example percentage adjustment value which is predetermined by a central
control unit which correspondingly also operates only one voltage
measurement process in the network. At any event the installations in
such a wind park can no longer operate in opposition to each other as a
result. l park regulation is shown for example in European patent
application EP 2 113 980 A2.
The above—mentioned problem that feeding installations can operate
in opposition to each other or at least unwanted unequal distribution of
network t occurs, can also correspondingly occur for a plurality of
wind parks which are to feed into a network independently of each other.
In a situation involving a plurality of ent wind parks the problem also
often arises that wind power installations from different manufacturers are
respectively combined. That causes difficUlty at least in co—ordination and
joint presetting of target values, as was explained above for a plurality of
wind power installations within a park.
As general state of the art ion is directed to US 2004/0010350,
A2 and Al.
The object of the present invention is therefore that of addressing at
least one of the above~mentioned problems. In particular the ion
seeks to propose a on which makes it possible for a plurality of feed~in
units which are basically operated independently of each other and which
feed into the same network to respectively feed uniformly into the network,
and in particular to be able to implement network t measures
uniformly — at least in regard to size or feed—in capacity thereof. The
invention at least seeks to propose an alternative on.
According to the invention there is proposed a method according to
ciaim 1. In ance therewith electric power is fed into an ic
network by means of at least one wind power lation with a feed-in
arrangement at a feed-in point. There can be provided a wind power
installation, a plurality of wind power installations and/or a wind park, in
which respect the feed into the network can involve the use of a
transformer.
The feed into the network is effected in ence on electric
parameters in the network. Measurement values of the electric parameters
or measurement values for determining the electric parameters, if
measurement is effected indirectly, are detected at measurement times at
predetermined time intervals. The measurement times are onised to
an external time signal available e the first feed—in arrangement.
The predetermined time intervals can be for example involving a
seconds rhythm or a minutes . That does not exciude moments in
time also being omitted because of given circumstances.
The electric parameters are therefore regularly ined and
synchronisation which makes it possible to predetermine absolute moments
in time is effected by way of the external time signal.
For example a measurement value recording can always be effected
at the full . That time specification of the fuii minute however, due
to the external synchronisation, is a time specification which is also defined
outside the feed-in arrangement and is thus aiso used in other feed—in
arrangements which do not have to have any ting link to that
present feed—in arrangement. External synchronisation thus permits feed—
in arrangements which operate independently of each other to actually
regularly detect, at the same measurement time, parameters in the
network such as in ular the network voltage. If the network voitage
is subject to fluctuations that synchronisation effect can provide that feed—
in arrangements which are operating independently of each other and
which are thus measuring ndently of each other measure the same
network situation. If therefore by virtue of the selected ement time,
by coincidence, when there is a ating voltage, a high value in respect
of that ating voltage is measured, then all those feed—in arrangements
measure that high value. Conversely, the same applies, if a low e
value of such a fluctuating voltage is detected. The feed—in arrangements
do not need any communication with each other for that e. Only one
external synchronisation signal needs to be available for each of those
stated n arrangements.
Such a time signal or synchronisation signal can be for example a
time signal from a satellite-supported positioning system such as for
example a GPS or other like for example s or Galileo.
gh in particular GPS has popularly become famous only for
determining position it nonetheless also includes a time signal. The official
designation of GPS is: “Navigational Satellite Timing and Ranging — Global
Positioning System”. Such a GPS therefore provides a globally available
time signal. There is thus absolutely available a full minute on a world—
wide uniform basis — to stay with that example - , irrespective of r
that should coincide for example with a full minute of an atomic clock. The
decisive consideration is that all feed—in arrangements which are to be
operated with the method according to the invention define exactly the
same measurement time. That is possible by using such an external time
signal which is available outside the feed—in arrangement such as that of a
GPS.
Preferably the feed—in arrangement is in the form of a wind power
installation or in the form of a wind park with a plurality of wind power
installations. Thus, particularly for wind power installations which are to
feed into the network ndently of each other or wind parks which are
to provide a feed into the network independently of each other, suitable
matching is provided in a simple and efficient fashion. That permits
uniform implementation of network support measures without those wind
power installations or wind parks which feed into the network
independently of each other requiring a communication among each other.
Preferably the measurement values are recorded over a
predetermined period on, in particular averaged. Thus for example
for each minute, averaging can be recorded and evaluated over 1 second or
seconds — to give just two examples. By establishing absolute
measurement times which in that respect can be established for example
as moments in time of the beginning of the period duration, measurement
recording and in particular averaging is effected in feed—in arrangements
ing independently of each other, over the same time range, and thus
this entails substantially the same ement values or averaging
values.
Preferably a plurality of feed—in ements are operated and each
feed—in arrangement is operated for feeding into the network at a
respective specific feed—in point. Each of those feed-in ements uses
the same time signal for synchronisation of the tive measurement
times. Thus the measurement times of all those n arrangements are
synchronised and in corresponding fashion all those feed—in arrangements
respectively measure at the same moment in time, that is to say a moment
in time which is the same on the basis of an absolute scale. In this case
also any voltage fluctuations are admittedly not identified and in that
respect there could be a minor measurement error, but such a
measurement error would be the same in all those operated feed—in
ements, at any event insofar as relates to time fluctuations in the
k or is caused thereby.
In a further embodiment it is proposed that at least one feed—in
arrangement and in particular all the n arrangements involved have a
respective clock, in particular a highly accurate clock. In that case the
measurement times are calculated by means of the clock and the clock is
regularly onised by means of the external time signal. That is
intended to permit time equality in respect of the measurement times of
that feed-in arrangement in relation to other feed—in arrangements, or to
provide time equality in respect of the measurement points of all feed—in
arrangements using that . The use of a clock, that is to say an
internal clock, provides that the feed~in method is not dependent on
ongoing availability of the external time signal. Rather, the method can be
operated on the basis of the internal clock and time ison with the
external synchronisation signal only needs to be implemented occasionally.
How often such synchronisation has to be effected depends in particular on
the synchronism quality of the internal clock.
Preferably the k voltage is detected as the electric parameter
or parameters. It is also desirable if, in dependence on the detected
electric parameters, in particular in dependence on the detected network
voltage, measures for supporting the network are effected, in particular
reactive power and additionally or alternatively active power is fed into the
network in dependence on the detected k e. That makes it
possible to provide for network support by that reactive and/or active
power feed from a plurality of feed—in arrangements, in particular a plurality
of wind power lations and in particular a plurality of wind parks, in a
uniform fashion. Uneven overloading by such‘network support from one of
the feed—in arrangements is d thereby.
Preferably detection of an external time signal can be implemented
for synchronising and/or for effecting synchronisation by means of an
SCADA . That basically known system can also include an internal
clock, for example for park regulation. Depending on the tive
embodiment ed the SCADA system can also be provided as a central
control for a wind park or for sub—functions in the wind park.
There is also proposed a wind power installation having an
aerodynamic rotor for producing a rotary movement from wind, an electric
generator for generating electric power from the rotary movement and a
feed—in means, in particular an inverter, for feeding the electric power or a
part thereof into an electric network. It is ingly proposed that a wind
3O power installation adapted for g into a network is operated with a
method according to at least one of the bed embodiments. In
particular such a wind power installation has corresponding technical means
which are specified or presupposed to be present in the respective
embodiments. In particular such a wind power installation has a control
means with a process control which has implemented one of the specified
methods. Preferably the wind power installation and in particular its control
ement has an internal clock which can be synchronised by means of
the externally available signal.
There is further proposed a wind park having a ity of wind
power installations, which is controlled with a method according to at least
one of the specified embodiments, in particular by such a method being
implemented. Such a wind park can have a ponding wind power
installation implemented with such a method or the wind park can include a
central control unit for implementing one of the methods according to the
invention. Synchronisation and correspondingly implemented
measurement at absolute moments in time can be provided centrally for
the wind park. In that t measurement of a plurality of wind parks
can be matched to each other by using synchronised measurement times,
without the need for communication between the wind parks.
Accordingly there is also proposed a wind park arrangement having a
plurality of wind parks, each wind park being controlled with a method
ing to the ion.
The invention is described by way of example hereinafter by means
of embodiments with reference to the anying Figures.
Figure 1 shows a wind power installation using a method according
to the invention,
Figure 2 diagrammatically shows the concept according to the
ion for synchronising two wind parks,
Figure 3 diagrammatically shows a wind park connected to a k
with synchronisation by means of an SCADA system,
Figure 4 shows the underlying problems in voltage measurement
with a fluctuating voltage, and
Figure 5 shows a graph to illustrate voltage—dependent reactive
power feed, as a network support example.
Figure 1 shows a wind power installation 100 comprising a pylon 102
and a pod 104. A rotor 106 having three rotor blades 108 and a spinner
110 is arranged on the pod 104. In operation the rotor 106 is caused to
rotate by the wind and thereby drives a generator in the pod 104.
Figure 2 mmatically shows a network 10 whose line properties
are indicated by way of illustration by a line inductance 12, a line resistance
14 and a line capacitance 16. In a realistic consideration that affords
different voltages in the k which are indicated as U1 and U2, on both
sides of that line inductance 12, line ance 14 and line capacitance 16.
By way of illustration, a first wind park WP1 and a second wind park
WP2 feeds in, at the appropriate ons. Each of those two wind parks
WP1 and WP2 is in the position of feeding reactive power into the network
, as indicated by a reactive power setting device 18 which can also be
referred to as the Q-setting device.
Accordingly both wind parks WP1 and WP2 have a voltage pickup 20
which correspondingly gives the measured voltage value U to the reactive
power setting device 18 so that it can feed ve power into the network
in voltage—dependent relationship.
A possible way of g reactive power into the network is shown
in Figure 5. There the reactive power Q is plotted in dependence on the
voltage U1 and U2 respectively. There, for simplification purposes, the basic
starting point adopted is a linear relationship n the reactive power Q
and the voltage U1 and U2 tively, which assumes a limit value as
from a given value of the e. In a first approximation, it is assumed
here that the voltages U1 and U; which can relate to the view in Figure 2
are approximately equal. It is to be noted that here the important
consideration is the voltage level in the sense of the effective value of the
voltage. It is also possible to involve other parameters, but this is less
usuaL
Figure 2 shows by way of illustration that the two wind parks WP1
and WP2 are synchronised by way of a global time signal 22. That external
time signal 22 is here produced by a GPS which, besides a position which is
indicated there as Pos, also produces a time signal which is indicated there
as T. By way of illustration that represents a timer 24 which for example
permits synchronisation to the beginning of a minute. The synchronisation
information is transmitted from the timer 24 to both wind power installation
parks WPl and WP2.
The wind park 30 in Figure 3 includes three wind power installations
32 for illustration purposes. The wind park 30 and thus the individual
installations 32 is or are lled by a wind park regulator 34 which can
be identified here as the WP—Contr.. In this case the wind park or each
individual installation receives the voltage U detected in the network and a
reference value in respect of reactive power Q.
For that purpose the wind park regulator 34 receives data from the
SCADA system 36 which receives inter alia time data 40 from a satellite—
supported system 38 for onisation purposes. The wind park 30 can
thus be synchronised to an absolute time signal, it can include identical
absolute measurement times corresponding to other wind parks and
accordingly it can feed power by way of a transformer 42 illustrated for
illustration purposes into the network 10 which can differ from the network
in Figure 2. By way thereof it is also possible to provide for
corresponding network support such as for example reactive power feed
into the network.
Figure 3 also shows an Internet 44 which can be connected to the
SCADA system 36. lly it is also possible to provide time
synchronisation by way of the Internet, r as the accuracy
requirements are adequate in each case.
Figure 4 shows possible consequences of different measurement
times in relation to a fluctuating voltage pattern. In Figure 4 the network
e U is plotted in dependence on time t. The digits 1 to 3 are intended
to indicate respective measurement times of different wind parks, namely a
first, second or third wind park. That could also relate to wind power
installations 32 which feed in power, ndently of each other. In that
respect Figure 4 makes it clear that there are different e levels at
3O ent measurement times. In that respect a problem can also arise in
regard to average value ion. Thus for e shown in hatching is
a region of two measurement points associated with a second feed—in
arrangement. The time duration of that hatched region can be for example
400 ms. That averaging ion can also depend on the region over
which measurement is implemented. Measurements with averaging can
also be improved by the proposed synchronisation effect.
By way of example time synchronisation can be effected at the
minutes change or can always‘relate to the beginning of a minute. A
measurement interval can be 400 ms to give just one example. Averaging
can be used as an arithmetic average. It is also possible to consider other
methods like for example those having ing properties.
What is involved as an underlying concept, in respect of various
measurements which are effected locally tely from each other, is the
acquisition of an almost identical measurement value. If the re
differences/measurement errors are not considered, the measurement
method is solely crucial for the result. There are three time dependencies:
ement time, measurement on, sampling times, in respect of
which it is proposed that one, a plurality of or all are synchronised.
From a technical point of view it is essentially the measurement
moment in time that plays a decisive role in measurement value detection.
By means of relatively accurate timers, the error in the measurement
duration and the sampling time can lly be negligibly slight in short
time periods, which can also depend on specific configurations.
If the measurement time in various, locally mutually separated
ements is not synchronised, considerable ions can occur,
which was recognised by the present invention and is to be avoided
thereby.
Thus according to the invention the m that park regulating
systems of different parks influence each other can be eliminated or at
least reduced. For individual installations in a park, namely a wind park,
solutions have already been proposed, which use suitable communication of
the wind power installations with each other or communication with a
central system like an SCADA.
This permits a uniform feed into the network and in ular
network support of wind parks which feed into the network independently
of each other. It is to be noted that network support is usually firstly
effected by way of ve power regulation. If that should not suffice,
active power tion can additionally be used.
A measure for improving a y measurement between wind parks
is using a plurality of sampling values or possibly sampling at a higher rate
and/or using a longer measurement period. For example an average value
can be formed every 50 ms or every 400 ms. The specified solution of
synchronisation for e by way of a GPS also affords a solution. In
both cases as far as possible the same prerequisites should be afforded
between different feeds or feed—in arrangements, in particular different
wind parks or wind power lations.
In that respect it is possible to use a GPS which in turn es a
stratum server which has a correspondingly high accuracy category so that
as a result synchronisation is of an advantageous nature. In particular a
so—called Hopf device is used.
For creating identical prerequisites for different feed—in
arrangements, in particular different wind parks, it is ageous if
m synchronisation, a uniform measurement period and a uniform
measurement method are involved.
Optionally a measurement period can be increased for example from
440 ms to 1.5 s in order to achieve an improvement thereby.
In particular time synchronisation is thus proposed. In that way it is
possible to synchronise autonomous, competing regulators to ensure
stability of those, in particular two such tors.
If a plurality of discrete voltage regulation systems are operated for
example at a network feed—in linkage point which can also be referred to as
feed-in nodes, they possibly do not run, synchronously. In the extreme
case that can lead to mutual rising oscillation of the regulators. One reason
for that m is measurement value averaging of the individual
regulators.
3O An almost identical ement value can be made available to all
regulators by using average values as the input parameter, which values
can be formed under the same boundary conditions, namely in particular
start time, measurement duration and sampling rate. Synchronisation is
preferably effected solely and simply in relation to time, whereby
synchronisation s possible without direct communication of the
installations in question.
Thus there is ed a on whose aim is to achieve synchronisation
of two wind parks by way of a time signal. That can lly also be applied to
a plurality of wind parks. Averaging of the voltage of a network connection point
could otherwise start at ent measurement times and could also last for
different lengths of time, depending on the respective measurement interval
used.
Different ing can lead to oscillation between the wind parks
involved, which would have the result that one wind park is loaded more heavily
than another and thus unequal load bution can occur. In this connection
attention is also directed to the BDEW (German Association of Energy and Water
Industries) Directive, the Technische Richtlinie Erzeugungsanlagen am
Mittelspannungsnetz, Richtlinie für Anschluss und Parallelbetrieb von
Erzeugungsanlagen am Mittelspannungsnetz, June 2008 edition, which on page
29/138 thereof leaves it open whether averaging of the voltage is effected over
1 s or 1 min. Thus in spite of observing the Directive different measurement
s or measurement intervals can be involved. It is proposed using
correspondingly identical measurement intervals.
This method can be used not only in relation to wind parks from different
manufacturers but also in relation to spatially separated measurement locations.
Claims (16)
1. A method of feeding electric power into an electric network wherein the feed is effected by means of at least one wind power lation with a first feed-in arrangement (WP1, WP2) at a feed-in point into the electric network, the feed is dependent upon electric parameters in the network, and wherein measurement values of the electric parameters or measurement values for determining the electric parameters are detected at measurement times at predetermined time intervals, and wherein the measurement times are synchronised to an external time signal available outside the first n ement.
2. A method according to claim 1 wherein the at least one wind power installation is in the form of a wind park (WP1, WP2) with a plurality of wind power installations.
3. A method according to claim 1 or claim 2 n the ement values are recorded as average values over a predetermined period duration, in particular averaged.
4. A method according to any one of the preceding claims terised in that a plurality of feed-in ements (WP1, WP2) are operated and each feedin arrangement (WP1, WP2) is operated for feeding into the network at a respective dedicated feed-in point and wherein each of said feed-in arrangements uses the same time signal for synchronisation of the respective measurement times so that the measurement times of all said feed-in arrangements (WP1, WP2) are synchronised so that all said feed-in arrangements (WP1, WP2) detect the measurement values at respective identical moments in time.
5. A method according to claim 4 characterised in that the feed-in arrangements (WP1, WP2) respectively use identical synchronisation, an identical measurement period and/or an identical measurement method.
6. A method according to any one of the preceding claims terised in that a time signal of a satellite-supported positioning system such as for example GPS is used as the external time signal.
7. A method according to any one of the preceding claims characterised in that at least one feed-in arrangement (WP1, WP2) has a respective clock, in particular a highly accurate clock, the measurement times are calculated by means of the clock and the clock is regularly synchronised by means of the external time signal to achieve time ty of the measurement times of the feed-in ements (WP1, WP2).
8. A method according to any one of the preceding claims terised in that the network voltage is detected as the electric parameters.
9. A method according to any one of the preceding claims terised in that measures for supporting the network are implemented in dependence on the detected ic parameters, in particular in dependence on the detected network voltage, and in ular active power and/or reactive power are fed into the network in dependence on the detected k voltage.
10. A wind power installation comprising an aerodynamic rotor for producing a rotary movement from wind, an electric generator for generating electric power from the rotary movement and a feed-in means, in particular an inverter, for feeding the electric power or a part thereof into an electric network, wherein the wind park (WP1, WP2) is controlled with a method according to any one of claims 1 to 9.
11. A wind park (WP1, WP2) having a plurality of wind power installations, in particular according to claim 10, wherein the wind park (WP1, WP2) is controlled with a method according to any one of claims 1 to 9.
12. A wind park arrangement having a plurality of wind parks (WP1, WP2) according to claim 11.
13. A method of feeding electric power into an electric network substantially as herein bed with reference to the accompanying drawings.
14. A wind power installation substantially as herein described with reference to the accompanying drawings.
15. A wind park substantially as herein described with nce to the anying drawings.
16. A wind park arrangement ntially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081446.9 | 2011-08-23 | ||
DE201110081446 DE102011081446A1 (en) | 2011-08-23 | 2011-08-23 | Method for operating a wind energy plant |
PCT/EP2012/065911 WO2013026748A1 (en) | 2011-08-23 | 2012-08-14 | Method for operating a wind energy installation |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ621182A NZ621182A (en) | 2015-11-27 |
NZ621182B2 true NZ621182B2 (en) | 2016-03-01 |
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