CN108336768B - Wind power plant active power optimization control method - Google Patents
Wind power plant active power optimization control method Download PDFInfo
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- 238000010248 power generation Methods 0.000 claims description 8
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- 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 provides an active power optimization control method for a wind power plant, which judges the generating capacity of a fan according to a predicted value of a wind turbine generator and arranges the generating capacity according to a certain sequence to form a group control fan difference sequence with a priority order. Secondly, an adjusting dead zone is arranged in the difference sequence, so that frequent fine adjustment of the fan is avoided, and the fan loss is reduced. And finally, considering the requirements of the maximum power change rate of the wind power plant for 1 minute and 10 minutes to ensure the stable output of the active power of the wind power plant.
Description
Technical Field
The invention relates to the technical field of wind power plant control, in particular to a wind power plant active power optimization control method.
Background
With the increasing consensus of renewable energy sources in the global development, wind power plays an important role in future energy power systems. In recent years, the wind power generation technology in China is rapidly developed, but the proportion of wind power in an energy structure is still increased by means of continuously expanding installed capacity. On the premise that the capacity of wind power is continuously increased, it is very important to improve the generating efficiency of the wind turbine.
The control method of the wind turbine of the wind power plant is an important factor for restricting the power generation efficiency, the difference value between a value issued by a power grid dispatching center and the actual active power of the wind power plant is mostly adopted as a regulation target in the existing active power control method, the active power distribution mode mostly adopts an average distribution or proportional distribution mode, and the influence of frequent fine adjustment of the wind turbine on the service life of the wind turbine is not considered. Although a scholars divides the wind turbines into different priorities by combining the prediction information of the wind turbines of the wind power plant, the uncertainty of prediction is not fully considered, and no dead zone for regulating the wind turbines is set. Meanwhile, the fan with the regulation error larger than the regulation dead zone may not participate in the scheduling regulation. Therefore, the waste of resources is inevitably caused, and the power generation efficiency of the wind power plant is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for optimizing and controlling the active power of the wind power plant is provided to achieve robust operation and maximum active power output of the wind power plant.
The solution of the invention is realized by the following steps: a wind power plant active power optimization control method comprises the following steps:
s1, judging whether regulation is needed according to a command issued by a power grid dispatching center or the requirement of a power dispatching system client, if so, entering the following step S2, and if not, entering the following step S6;
s2, dividing the wind turbine generator in the power generation state into an independent control fan and a group control fan according to the current operation state and the maintenance state of the wind turbine generator in the wind power plant;
s3, obtaining the active power difference of the group control fans according to the power predicted value and the real-time active power of each group control fan, and arranging the active power difference according to a set sequence to generate an active power difference sequence participating in the regulation and control of the unit;
s4, calculating an active power regulation value of the group control wind turbine generator;
s5, respectively sending the active power regulation and control values calculated in the step S4 to each fan, and writing the active power regulation and control values into a PLC (programmable logic controller) of each fan to complete current regulation and control;
and S6, setting a control delay, returning to the step S1, and entering the next control period.
Another technical solution of the present invention is that, on the basis of the above, the step S1 specifically includes:
s11, according to the active power instruction P issued by the power grid dispatching centercmdReal-time active power P of wind farmtCalculating the regulation period of the wind power plant according to the following formulaThe total power adjustment P in the tank is,
P＝Pcmd-Pt
s12, judging whether the active output of the wind power plant needs to be adjusted or not according to the following formula, if so, not adjusting the active output of the wind power plant, and entering the step S6; if the following equation is not satisfied, the process proceeds to step S2.
|P|≤η×Pt
In the above formula, η is the adjustment dead zone coefficient.
Another technical solution of the present invention is that, based on the above, the step S3 further includes: and correcting the predicted power sequence of the group control wind turbines to enable the predicted power of each group control wind turbine generator to be between the minimum value and the maximum value of the output of the wind turbine generator.
Another technical solution of the present invention is that, on the basis of the above, the step S3 specifically includes:
s31, setting the number of the wind power plant group control wind turbine generators as n, and in the power regulation and control period of the wind power plant, predicting an information sequence P according to the corrected power of each group control wind turbine generatorf,t+1And the actual power output Pa,tCalculating the power difference P of each group control wind turbinetWherein, in the step (A),
Pf,t+1＝[Pf,t+1,1,Pf,t+1,2,…,Pf,t+1,n]
Pa,t＝[Pa,t,1,Pa,t,2,…,Pa,t,n]
Pt＝Pf,t+1-Pa,t＝[Pt,1,Pt,2,…,Pt,n]
wherein the content of the first and second substances,
i＝1,2,…,n，Pa,t,ireal-time active power P of unit i at t-th timet,nThe active power difference of the fan with the number n regulated and controlled at the t moment is represented;
s32, dividing the power difference PtThe elements in (1) are arranged in the following order to form an active difference sequence xit；
When the power is increased:Ptthe elements in (A) are arranged in the order from big to small;
when the power is reduced: ptThe elements in (A) are arranged in the order from small to large;
in the formula, q is more than or equal to 1 and less than or equal to n, r is more than or equal to 1 and less than or equal to n, h is more than or equal to 1 and less than or equal to n, and the three of q, r and h are not equal to each other,
wherein the content of the first and second substances,
representing the regulation and control difference of the fan with the priority i at the t-th moment;
s33, generating an active difference sequence F participating in the regulation and control of the unit,
if m exists, the active difference sequence F participating in the regulation and control unit can be obtained when the following conditions are met,
in the formula, m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1 and less than or equal to n;
when the power is increased: the condition to be satisfied is
When the power is reduced: the condition to be satisfied is
In the formula (I), the compound is shown in the specification,
indicating the fine adjustment amount of the unit i.
Another technical solution of the present invention is based on the above description when
The smaller the size, the more preferred the regulation.
Another technical solution of the present invention is that, based on the above, the step S3 further includes: set up and adjust the blind spot unit, specifically do:
if the regulation balance of the unit i meets the following conditions, the power balance of the unit is in a regulation dead zone, namely the unit does not participate in regulation;
in the formula (I), the compound is shown in the specification,
indicating the fine adjustment amount of the unit i.
Another technical solution of the present invention is that, on the basis of the above, the step S4 specifically includes:
s41 power regulation difference of wind power plant group control wind turbine generator
The maximum power variation of the wind power plant within 10 minutes
Maximum power change rate of wind farm for 1 minute
The following requirements of (1);
when the power is increased:
in the formula (I), the compound is shown in the specification,
is the sum of the power change amount of the first 9 minutes of the current regulation,
is the power differenceThe sum of terms in the sequence whose difference is greater than zero;
when the power is reduced:
at this time, the process of the present invention,
is the sum of the terms in the sequence of power differences whose difference is less than zero;
s42, distributing the regulation and control quantity of each group control fan, specifically:
the regulation and control difference P of the fan with the number kt,kComprises the following steps:
regulation and control value P of fan with number kt',kComprises the following steps: pt',k＝Pa,t,k+Pt,kWherein k is 1,2, …, m;
the setting values of other group control fans are unchanged.
On the basis, in the step S5, the active power control value calculated in the step S4 is respectively sent to the remote terminal units of the fans, and is written into the PLC of the fan through MODBUS communication.
According to the technical scheme, the embodiment of the invention has the following advantages:
according to the active power optimization control method for the wind power plant, a research object is a group control fan in the wind power plant. Firstly, judging the generating capacity of the fan according to the predicted value of the wind turbine generator, and arranging the generating capacity according to a certain sequence to form a group control fan difference sequence with a priority order. Secondly, an adjusting dead zone is arranged in the difference sequence, so that frequent fine adjustment of the fan is avoided, and the fan loss is reduced. And finally, considering the requirements of the maximum power change rate of the wind power plant for 1 minute and 10 minutes to ensure the stable output of the active power of the wind power plant.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a control flow chart of an active power optimization control method of a wind power plant according to an embodiment of the present invention;
fig. 2 is an active difference sequence chart in the active power optimization control method of the wind power plant in one embodiment of the invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention is as follows, and as shown in FIG. 1, a wind power plant active power optimization control method comprises the following steps:
s1, judging whether regulation is needed according to a command issued by a power grid dispatching center or the requirement of a power dispatching system client, if so, entering the following step S2, and if not, entering the following step S6;
s2, dividing the wind turbine generator in the power generation state into an independent control fan and a group control fan according to the current operation state and the maintenance state of the wind turbine generator in the wind power plant;
s3, obtaining the active power difference of the group control fans according to the power predicted value and the real-time active power of each group control fan, and arranging the active power difference according to a set sequence to generate an active power difference sequence participating in the regulation and control of the unit;
s4, calculating an active power regulation value of the group control wind turbine generator;
s5, respectively sending the active power regulation and control values calculated in the step S4 to each fan, and writing the active power regulation and control values into a PLC (programmable logic controller) of each fan to complete current regulation and control;
and S6, setting a control delay, returning to the step S1, and entering the next control period.
The active power optimization control method of the wind power plant comprises the steps that firstly, a wind power plant dispatching system judges whether to regulate and control the active output of the wind power plant according to an issued value of a power grid dispatching center or the requirement of a power dispatching system client, then, an individual control fan and a group control fan are divided, then, an active difference sequence of the wind power plant participating in regulation and control of the group control fan is obtained, the active setting value of a group control wind turbine generator set is distributed, the transmission and writing of the setting value, the setting control delay and the like are distributed, therefore, frequent fine adjustment of the fan is avoided, the loss of the fan is reduced, and the stable output of the active power of the.
In step S2, the wind turbines in the power generation state are divided into two types, i.e., an individually controlled wind turbine and a group controlled wind turbine, according to the current operating state and the current maintenance state of the wind turbines in the wind farm. The power generation setting value of the fan is controlled independently and does not change along with the change of the prediction value of the fan, so that the fan of the type does not participate in the dynamic regulation and control of active power, but still participates in the power grid dispatching.
In step S3, an active difference sequence of the wind farm participating in regulation and control of the group control fans is obtained, and the specific steps sequentially include: a. and correcting the predicted power sequence of the group control fan. b. Calculating the power difference P of each group control fant. c. Will PtThe elements in (A) are in a certain orderThe sequence is arranged to form an active difference sequence xit. d. And setting a regulation dead zone unit. e. And generating an active difference sequence F participating in the regulation and control unit, as shown in FIG. 2.
Further, in the step a, the predicted power sequence of the group control fan is corrected to enable the predicted power of each wind turbine generator to be between the minimum value and the maximum value of the fan output, and the corrected predicted power sequence of the group control fan is marked as Pf,t+1＝[Pf,t+1,1,Pf,t+1,2,…,Pf,t+1,n]And n is the number of the group control fans in operation.
Further, in the step b, the number of the group control wind turbines of the wind power plant is set as n, and in the power regulation and control period of the wind power plant, the information sequence P is predicted according to the corrected power of each group control wind turbinef,t+1And the actual power output Pa,tCalculating the power difference P of each group control wind turbinetWherein, the information sequence P is predicted according to the corrected power of each group control wind turbine generatorf,t+1And the actual power output Pa,tCalculating the power difference P of each group control wind turbinet. Wherein the content of the first and second substances,
the power prediction information sequence of the group control wind turbine generator is as follows: pf,t+1＝[Pf,t+1,1,Pf,t+1,2,…,Pf,t+1,n]，
The actual power output of the group control fan is as follows: pa,t＝[Pa,t,1,Pa,t,2,…,Pa,t,n]，
With a power difference of Pt＝Pf,t+1-Pa,t＝[Pt,1,Pt,2,…,Pt,n]。
In the above formula, the first and second carbon atoms are,
i＝1,2,…,n，Pa,t,iactive power P of unit i at t-th timet,nAnd the power difference regulated by the fan with the number n at the t-th moment is shown.
Further, step c, dividing the power difference PtThe elements in (1) are arranged in the following order to form an active difference sequence xit；
When the power is increased: ptThe elements in (A) are arranged in the order from big to small;
when the power is reduced: ptThe elements in (a) are arranged in order from small to large.
The resulting sequence was:
in the formula, q is more than or equal to 1 and less than or equal to n, r is more than or equal to 1 and less than or equal to n, h is more than or equal to 1 and less than or equal to n, and the three of q, r and h are not equal to each other,
wherein the content of the first and second substances,
and indicating the regulation difference of the fan with the priority i at the t-th moment. Here, when
The smaller the size, the more preferred the regulation.
Further, step d, set up and adjust the unit of the dead zone, specifically do:
if the regulation balance of the unit i meets the following conditions, the power balance of the unit is in the regulation dead zone, namely the unit does not participate in regulation and control:
in the formula (I), the compound is shown in the specification,
indicating the fine adjustment amount of the unit i. If the power difference of a certain fan in the group control wind turbine generator meets the condition, the fan does not participate in regulation and control in the regulation and control period. The purpose of setting the regulation dead zone is to avoid frequent regulation of the wind turbine generator and reduce fan loss.
And step e, generating an active difference sequence F participating in the regulation and control of the unit.
When the power is increased: and c, removing the dead zone of regulation and the part of which the power difference is less than zero from the sequence obtained in the step c, and obtaining an active difference sequence F liter of the unit participating in regulation and control.
Namely: m is present such that
And satisfy the conditions
And is
In the above formula, m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1 and less than or equal to n.
When the power is reduced: and c, removing the dead zone of regulation and the part of the power difference larger than zero from the sequence obtained in the step c, and obtaining the active difference sequence Fdrop of the unit participating in regulation and control.
M is present such that
And satisfy the conditions
And is
In the above formula, m is more than or equal to 1 and less than or equal to n, k is more than or equal to 1 and less than or equal to n,
indicating the fine adjustment amount of the unit i.
On the basis of the foregoing embodiment, in another embodiment of the present invention, the step S1 specifically includes:
s11, according to the active power instruction P issued by the power grid dispatching centercmdReal-time active power P of wind farmtCalculating the total power regulating quantity P in the regulation and control period of the wind power plant according to the following formula,
P＝Pcmd-Pt
s12, judging whether the active output of the wind power plant needs to be adjusted or not according to the following formula, if so, not adjusting the active output of the wind power plant, and entering the step S6; if the following equation is not satisfied, the process proceeds to step S2.
|P|≤η×Pt
In the above formula, η is the adjustment dead zone coefficient.
On the basis of the foregoing embodiment, in another embodiment of the present invention, the step S4 specifically includes:
s41 power regulation difference of wind power plant group control wind turbine generator
The maximum power variation of the wind power plant within 10 minutes
Maximum power change rate of wind farm for 1 minute
The following requirements of (1);
when the power is increased:
in the formula (I), the compound is shown in the specification,
is the sum of the power change amount of the first 9 minutes of the current regulation,
is the sum of the terms in the sequence of power differences whose difference is greater than zero;
when the power is reduced:
at this time, the process of the present invention,
is that the difference in the power difference sequence is less than zeroThe sum of the items of (1);
s42, distributing the regulation and control quantity of each group control fan, specifically:
the regulation and control difference P of the fan with the number kt,kComprises the following steps:
regulating value P 'of fan with number k't,kComprises the following steps: p't,k＝Pa,t,k+Pt,kWherein k is 1,2, …, m;
the setting values of other group control fans are unchanged.
On the basis, in the step S5, the active power control value calculated in the step S4 is respectively sent to the remote terminal units of the fans, and is written into the PLC of the fan through MODBUS communication, so as to complete current control.
According to the technical scheme, the embodiment of the invention has the following advantages:
according to the active power optimization control method for the wind power plant, a research object is a group control fan in the wind power plant. Firstly, judging the generating capacity of the fan according to the predicted value of the wind turbine generator, and arranging the generating capacity according to a certain sequence to form a group control fan difference sequence with a priority order. Secondly, an adjusting dead zone is arranged in the difference sequence, so that frequent fine adjustment of the fan is avoided, and the fan loss is reduced. And finally, considering the requirements of the maximum power change rate of the wind power plant for 1 minute and 10 minutes to ensure the stable output of the active power of the wind power plant.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A wind power plant active power optimization control method is characterized by comprising the following steps:
s1, judging whether regulation is needed according to a command issued by a power grid dispatching center or the requirement of a power dispatching system client, if so, entering the following step S2, and if not, entering the following step S6;
s2, dividing the wind turbine generator in the power generation state into an independent control fan and a group control fan according to the current operation state and the maintenance state of the wind turbine generator in the wind power plant;
s3, obtaining the active power difference of the group control fans according to the power predicted value and the real-time active power of each group control fan, and arranging the active power difference according to a set sequence to generate an active power difference sequence participating in the regulation and control of the unit;
s4, calculating an active power regulation value of the group control wind turbine generator;
s5, respectively sending the active power regulation and control values calculated in the step S4 to each fan, and writing the active power regulation and control values into a PLC (programmable logic controller) of each fan to complete current regulation and control;
s6, setting control delay, returning to the step S1, and entering the next control period;
the step S3 specifically includes:
s31, setting the number of the wind power plant group control wind turbine generators as n, and in the power regulation and control period of the wind power plant, predicting an information sequence P according to the corrected power of each group control wind turbine generatorf,t+1And the actual power output Pa,tCalculating the power difference P of each group control wind turbinetWherein, in the step (A),
Pf,t+1＝[Pf,t+1,1,Pf,t+1,2,…,Pf,t+1,n]
Pa,t＝[Pa,t,1,Pa,t,2,…,Pa,t,n]
Pt＝Pf,t+1-Pa,t＝[Pt,1,Pt,2,…,Pt,n]
wherein the content of the first and second substances,
Pa,t,ireal-time active power P of unit i at t-th timet,nThe active power difference of the fan with the number n regulated and controlled at the t moment is represented;
s32, dividing the power difference PtThe elements in (1) are arranged in the following order to form an active difference sequence xit；
When the power is increased: ptThe elements in (A) are arranged in the order from big to small;
when the power is reduced: ptThe elements in (A) are arranged in the order from small to large;
in the formula, q is more than or equal to 1 and less than or equal to n, r is more than or equal to 1 and less than or equal to n, h is more than or equal to 1 and less than or equal to n, and the three of q, r and h are not equal to each other,
wherein the content of the first and second substances,
representing the regulation and control difference of the fan with the priority i at the t-th moment;
s33, generating an active difference sequence F participating in the regulation and control of the unit,
if m exists, the active difference sequence F participating in the regulation and control unit can be obtained when the following conditions are met,
in the formula, m is more than or equal to 1 and less than or equal to n, and k is more than or equal to 1 and less than or equal to n;
when the power is increased: the condition to be satisfied is
And is
When the power is reduced: the condition to be satisfied is
And is
In the formula (I), the compound is shown in the specification,
indicating the fine adjustment amount of the unit i.
2. The wind farm active power optimization control method according to claim 1, wherein the step S1 specifically includes:
s11, according to the active power instruction P issued by the power grid dispatching centercmdReal-time active power P of wind farmtCalculating the total power regulating quantity P in the regulation and control period of the wind power plant according to the following formula,
P＝Pcmd-Pt
s12, judging whether the active output of the wind power plant needs to be adjusted or not according to the following formula, if so, not adjusting the active output of the wind power plant, and entering the step S6; if the following expression is not satisfied, the process proceeds to step S2;
|P|≤η×Pt
in the above formula, η is the adjustment dead zone coefficient.
3. The wind farm active power optimization control method according to claim 1, wherein the step S3 further comprises: and correcting the predicted power sequence of the group control wind turbines to enable the predicted power of each group control wind turbine generator to be between the minimum value and the maximum value of the output of the wind turbine generator.
4. The wind farm active power optimization control method according to claim 1, characterized in that when the wind farm active power optimization control method is used
The smaller the size, the more preferred the regulation.
5. The wind farm active power optimization control method according to claim 1, wherein the step S3 further comprises: set up and adjust the blind spot unit, specifically do:
if the regulation balance of the unit i meets the following conditions, the power balance of the unit is in a regulation dead zone, namely the unit does not participate in regulation;
in the formula (I), the compound is shown in the specification,
indicating the fine adjustment amount of the unit i.
6. The wind farm active power optimization control method according to claim 2, wherein the step S4 specifically includes:
s41 power regulation difference of wind power plant group control wind turbine generator
The maximum power variation of the wind power plant within 10 minutes
Maximum power change rate of wind farm for 1 minute
The following requirements of (1);
when the power is increased:
in the formula (I), the compound is shown in the specification,
is the sum of the power change amount of the first 9 minutes of the current regulation,
being a term in the sequence of power differences with a difference greater than zeroAnd;
when the power is reduced:
at this time, the process of the present invention,
is the sum of the terms in the sequence of power differences whose difference is less than zero;
s42, distributing the regulation and control quantity of each group control fan, specifically:
the regulation and control difference P of the fan with the number kt,kComprises the following steps:
regulating value P 'of fan with number k't,kComprises the following steps: p't,k＝Pa,t,k+Pt,kWherein k is 1,2, …, m;
the setting values of other group control fans are unchanged.
7. The wind farm active power optimization control method according to any one of claims 1 to 6, wherein in the step S5, the active power regulation value calculated in the step S4 is respectively sent to the remote terminal units of the wind turbines, and is written into the PLC of the wind turbines through MODBUS communication.
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| CN109672218B (en) * | 2018-12-25 | 2023-02-03 | 新疆金风科技股份有限公司 | Power control method and device for wind turbine generator |
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