CN104732008A - Wind power plant equating method based on low voltage ride through period control strategy - Google Patents

Wind power plant equating method based on low voltage ride through period control strategy Download PDF

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Publication number
CN104732008A
CN104732008A CN201510010111.5A CN201510010111A CN104732008A CN 104732008 A CN104732008 A CN 104732008A CN 201510010111 A CN201510010111 A CN 201510010111A CN 104732008 A CN104732008 A CN 104732008A
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value
control
energy turbine
turbine set
wind energy
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CN104732008B (en
Inventor
侯俊贤
那志强
孙维真
万磊
倪秋龙
王毅
张静
董毅峰
叶琳
王洪富
王超
杨滢
石博隆
杜三恩
冯静
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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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
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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Abstract

The invention provides a wind power plant equating method based on a low voltage ride through period control strategy. The method comprises the following steps that an active current control value and a reactive current control value of a wind generator set are calculated; the sum of actual active current control values of a wind power plant and the sum of actual reactive current control values of the wind power plant are calculated; the sum of equivalent active current control values of the wind power plant and the sum of equivalent reactive current control values of the wind power plant are calculated; the final equivalent unit number of the wind generator set is determined. The wind power plant equating method based on the low voltage ride through period control strategy is based on a scalar multiplication method, and is a method for equating the wind power plant to a plurality of units which are completely the same and determining the reasonable number of the equivalent units, and the expected result needed in a project can be achieved.

Description

A kind of wind energy turbine set equivalence method based on control strategy during low voltage crossing
Technical field
The present invention relates to a kind of equivalence method, be specifically related to a kind of wind energy turbine set equivalence method based on control strategy during low voltage crossing.
Background technology
Multiple stage Wind turbines of the same type is generally comprised in wind energy turbine set, in electric system simulation is analyzed, Wind turbines all in wind energy turbine set is all carried out Modeling Calculation, the scale of simulation calculation can be made greatly to increase, from Electrical-Machanical Transient Simulation of Power System calculate angle there is no need by wind energy turbine set consider very detailed, also there is no need wind energy turbine set to carry out detailed consideration completely from the angle of Wind turbines electrical specification, therefore wind energy turbine set can be carried out Equivalent Simplification in electric system simulation.
The equivalent problem of wind energy turbine set is a focus studied for a long time, and the problem that wind energy turbine set equivalence is considered and application target may be variant, and the problem considered in equivalence course is also different, therefore the target of the equivalent first necessary certainty equivalents of wind energy turbine set.The wind energy turbine set equivalence that Bulk power system simulation needs is one of wherein main object.For the equivalence method being applicable to electric system simulation, carried out a large amount of research work, mainly consider that the circuit of wind energy turbine set inside and the mode of connection carry out Static Equivalent from the viewpoint of static, dynamic equivalent aspect mainly contains following several thinking:
1) adopt the method for weighting, Wind turbines major parameter is weighted.
This method considers the equivalence of dissimilar unit, Wind turbines machine set type in real system wind energy turbine set is identical, therefore adopt the method what does not have necessary, the merging in addition for dissimilar unit adopts the method can not obtain result more accurately.
2) adopt the method doubly taken advantage of, namely equivalence is identical multiple stage unit
This Measures compare is simple, but is single unit by simple for the wind energy turbine set of more complicated equivalence, is subject to the query of a lot of researcher.But much adopt in this way in actual application at home and abroad more.
3) additive method
The algorithm that have employed more complicated in some research process carries out equivalence, although seem more advanced in theory, from the prerequisite considered a problem and conclusion, does not also obtain good result.
The parameter of the research process medium value of wind energy turbine set equivalence all considers the equivalence of the parameter in generator parameter and part control system substantially.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of wind energy turbine set equivalence method based on control strategy during low voltage crossing, based on the method doubly taken advantage of, be identical multiple stage unit by wind energy turbine set equivalence, determine the method for more rational equivalent number of units, to reach the result of the requirement of engineering of expection.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of wind energy turbine set equivalence method based on control strategy during low voltage crossing, during low voltage crossing, the control strategy of Wind turbines comprises real power control strategy and idle control strategy; Said method comprising the steps of:
Step 1: the active current controlling value and the reactive current control value that calculate Wind turbines;
Step 2: calculate the actual active current controlling value sum of wind energy turbine set under different Voltage Drop levels and actual reactive current control value sum respectively;
Step 3: calculate the equivalent active current controlling value sum of wind energy turbine set under different Voltage Drop levels and equivalent reactive current control value sum respectively;
Step 4: the final equivalent number of units determining Wind turbines.
Described step 1 comprises the following steps:
Step 1-1: according to the active current controlling value i of real power control policy calculation Wind turbines p;
Step 1-2: the reactive current control value i calculating Wind turbines according to idle control strategy q;
Step 1-3: to i pand i qrevise.
In described step 1-1, the control mode taked according to real power control strategy calculates the active current controlling value of Wind turbines respectively, is specially:
(1) when real power control strategy takes the control mode based on initial power, i pbe expressed as:
i P = P init V k
(2) when real power control strategy takes the control mode of specified current flow, i pbe expressed as:
i P＝i Pcon
(3) when real power control strategy is taked to specify the control mode of active power, i pbe expressed as:
i P = P con V k
Wherein, P initrepresent initial active power, V krepresent the Voltage Drop level selected, i pconactive current control objectives value during representing low voltage crossing, P conrepresent the active power controller desired value during low voltage crossing.
In described step 1-2, the control mode taked according to idle control strategy calculates the reactive current control value of Wind turbines respectively, is specially:
(1) when idle control strategy takes the control mode based on voltage, i qbe expressed as:
i Q＝k Q(V ref-V k)
(2) when idle control strategy takes the control mode of specified current flow, i qbe expressed as:
i Q＝i Qcon
(3) when idle control strategy is taked to specify the control mode of reactive power, i qbe expressed as:
i Q = Q con V k
Wherein, k qrepresent Wind turbines set end voltage design factor, V refrepresent the Voltage Drop horizontal reference value selected, i qconreactive current control desired value during representing low voltage crossing, Q conrepresent the Reactive Power Control desired value during low voltage crossing.
In described step 1-3, maximum current amplitude limit value, active current amplitude limit value and reactive current amplitude limit value use i respectively lim, i plimand i qlimrepresent, be divided into following two kinds of situations to i pand i qrevise:
(1), when taking active current to control preferential control mode, have:
(1-1) calculate active current amplitude limit value, it equals maximum current amplitude limit value, i.e. i plim=i lim;
If (1-2) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim;
(1-3) calculate reactive current amplitude limit value, have
If (1-4) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2), during the control mode taking reactive current control preferential, have:
(2-1) calculate reactive current amplitude limit value, it equals maximum current amplitude limit value, i.e. i qlim=i lim;
If (2-2) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2-3) calculate active current amplitude limit value, have
If (2-4) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim.
In described step 2, if actual Wind turbines has N platform in wind energy turbine set, in wind energy turbine set, actual active current controlling value sum and actual reactive current control value sum use i respectively p_totand i q_totrepresent, have:
i P _ tot = &Sigma; n = 1 N i P n
i Q _ tot = &Sigma; n = 1 N i Q n
Wherein, represent the actual active current controlling value of the n-th typhoon group of motors in wind energy turbine set, meet represent the actual reactive current control value of the n-th typhoon group of motors in wind energy turbine set, meet
In described step 3, if equivalent Wind turbines has M platform in wind energy turbine set, in wind energy turbine set, equivalent active current controlling value sum and equivalent reactive current control value sum use i ' respectively p_totwith i ' q_totrepresent, have:
i P _ tot &prime; = &Sigma; m = 1 M i P m
i Q _ tot &prime; = &Sigma; m = 1 M i Q m
Wherein, represent the equivalent active current controlling value of m typhoon group of motors in wind energy turbine set, meet represent the equivalent reactive current control value of m typhoon group of motors in wind energy turbine set, meet
In described step 4, for each Voltage Drop level selected, respectively by i p_totwith i ' p_tot, and i q_totwith i ' q_totcompare, obtain the equivalent number of units of best Wind turbines corresponding to each Voltage Drop level; And in selected Voltage Drop level, select the equivalent number of units of minimum Wind turbines as the final equivalent number of units of Wind turbines.
Compared with prior art, beneficial effect of the present invention is:
(1) taken into full account the dynamic perfromance of Wind turbines, the active reactive change of the Wind turbines caused after system electrical fault is the emphasis of research, and the characteristic wherein during low voltage crossing is its most crucial characteristic, is the important foundation of this method;
(2) wind energy turbine set equivalence have employed the equivalence method of the identical unit of multiple stage, mainly determines rational equivalent number of units, and equivalence course calculates simple, and can reach more satisfactory effect.
Embodiment
Below the present invention is described in further detail.
In large-scale electrical power system emulation, it is necessary for carrying out equivalence to the multiple stage unit in wind energy turbine set.From the angle that Electrical Power System Dynamic is analyzed, the difference that the electrical specification during needing based on LVRT Capability of Wind Turbine Generator, the different operating point of consideration same kind Wind turbines bring carries out the equivalence of wind energy turbine set.The present invention mainly based on the simple equivalent mode by wind energy turbine set equivalence being the identical unit of multiple stage, determines its rational equivalent number of units.Emphasis considers the control strategy of the real power control of Wind turbines during voltage ride-through, idle control and amplitude limit link, according to the actual motion point of multiple stage Wind turbines in wind energy turbine set, carry out the calculating of all Wind turbines active currents and reactive current output, then the number of units after the equivalence matched with it is found, determine rational equivalence range, using its minimum equivalent number of units as final equivalent result, reach the dual purpose taken into account accuracy of simulation and calculate conservative property.
Equivalent for wind energy turbine set, need to consider following problem:
1) wind energy turbine set has the Wind turbines of a large amount of determinations to form, and therefore wind energy turbine set equivalence must carry out on Wind turbines characteristic basis, needs fully to carry out in conjunction with the key characteristic of Wind turbines and Transient simulation model;
2) in wind energy turbine set be substantially all same kind Wind turbines form, so there is no the situation of the dissimilar unit of necessary consideration, have the situation of existence two kinds of types, equivalence can be separated;
It is 3) main in electric system simulation process that what pay close attention to is the dynamic behaviour of Wind turbines after electric network fault, mainly consider from electric angle, therefore need to pay close attention to the electrical specification of Wind turbines under electric network fault condition, the state of Static Equivalent major effect stable state, little on dynamic process impact;
4) the Wind turbines type adopted in actual wind energy turbine set is identical; therefore the control and protection of its correspondence is also consistent, and under similarity condition, actual electrical specification is also basically identical, but in real system, exerting oneself of wind energy turbine set compares dispersion; namely operating point is different, needs emphasis to consider.
5) wind energy turbine set larger for scale is carried out equivalence to be certain to reduce its accuracy, but due to dispersiveness, uncertainty that real system runs, no matter adopt the method for what advanced person also can not reach accuracy in ideal, but from the angle of practical application, if accuracy can acquire a certain degree or determine certain scope, actual needs just can be met.
After grid collapses, affect that Wind turbines is gained merit, the principal element of idle characteristic be low voltage crossing during control characteristic, low wear period major control be gain merit, reactive current, in wind energy turbine set, multiple stage unit is due to initial power operating point difference, corresponding control is meritorious may be there are differences with reactive current, and the equivalent rear unit replacement adopting original state identical, therefore corresponding in control procedure controlled quentity controlled variable generally can there are differences, and is the main reason causing difference in dynamic process.
During low voltage crossing, the major control characteristic of influential system comprises following several aspect:
■ real power control strategy, low wear period may adopt according to several modes such as initial power calculating current, specified current flow, specified power;
■ is idle control strategy, lowly wears period and may adopt based on Control of Voltage, specify several modes such as idle, specified current flow;
■ amplitude limit, comprises meritorious and idle amplitude limit.
The invention provides a kind of wind energy turbine set equivalence method based on control strategy during low voltage crossing, during low voltage crossing, the control strategy of Wind turbines comprises real power control strategy and idle control strategy; Said method comprising the steps of:
Step 1: the active current controlling value and the reactive current control value that calculate Wind turbines;
Step 2: calculate the actual active current controlling value sum of wind energy turbine set under different Voltage Drop levels and actual reactive current control value sum respectively;
Step 3: calculate the equivalent active current controlling value sum of wind energy turbine set under different Voltage Drop levels and equivalent reactive current control value sum respectively;
Step 4: the final equivalent number of units determining Wind turbines.
Described step 1 comprises the following steps:
Step 1-1: according to the active current controlling value i of real power control policy calculation Wind turbines p;
Step 1-2: the reactive current control value i calculating Wind turbines according to idle control strategy q;
Step 1-3: to i pand i qrevise.
In described step 1-1, the control mode taked according to real power control strategy calculates the active current controlling value of Wind turbines respectively, is specially:
(1) when real power control strategy takes the control mode based on initial power, i pbe expressed as:
i P = P init V k
(2) when real power control strategy takes the control mode of specified current flow, i pbe expressed as:
i P＝i Pcon
(3) when real power control strategy is taked to specify the control mode of active power, i pbe expressed as:
i P = P con V k
Wherein, P initrepresent initial active power, V krepresent the Voltage Drop level selected, i pconactive current control objectives value during representing low voltage crossing, P conrepresent the active power controller desired value during low voltage crossing.
In described step 1-2, the control mode taked according to idle control strategy calculates the reactive current control value of Wind turbines respectively, is specially:
(1) when idle control strategy takes the control mode based on voltage, i qbe expressed as:
i Q＝k Q(V ref-V k)
(2) when idle control strategy takes the control mode of specified current flow, i qbe expressed as:
i Q＝i Qcon
(3) when idle control strategy is taked to specify the control mode of reactive power, i qbe expressed as:
i Q = Q con V k
Wherein, k qrepresent Wind turbines set end voltage design factor, V refrepresent the Voltage Drop horizontal reference value selected, i qconreactive current control desired value during representing low voltage crossing, Q conrepresent the Reactive Power Control desired value during low voltage crossing.
In described step 1-3, maximum current amplitude limit value, active current amplitude limit value and reactive current amplitude limit value use i respectively lim, i plimand i qlimrepresent, be divided into following two kinds of situations to i pand i qrevise:
(1), when taking active current to control preferential control mode, have:
(1-1) calculate active current amplitude limit value, it equals maximum current amplitude limit value, i.e. i plim=i lim;
If (1-2) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim;
(1-3) calculate reactive current amplitude limit value, have
If (1-4) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2), during the control mode taking reactive current control preferential, have:
(2-1) calculate reactive current amplitude limit value, it equals maximum current amplitude limit value, i.e. i qlim=i lim;
If (2-2) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2-3) calculate active current amplitude limit value, have
If (2-4) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim.
In described step 2, if actual Wind turbines has N platform in wind energy turbine set, in wind energy turbine set, actual active current controlling value sum and actual reactive current control value sum use i respectively p_totand i q_totrepresent, have:
i P _ tot = &Sigma; n = 1 N i P n
i Q _ tot = &Sigma; n = 1 N i Q n
Wherein, represent the actual active current controlling value of the n-th typhoon group of motors in wind energy turbine set, meet represent the actual reactive current control value of the n-th typhoon group of motors in wind energy turbine set, meet
In described step 3, if equivalent Wind turbines has M platform in wind energy turbine set, in wind energy turbine set, equivalent active current controlling value sum and equivalent reactive current control value sum use i ' respectively p_totwith i ' q_totrepresent, have:
i P _ tot &prime; = &Sigma; m = 1 M i P m
i Q _ tot &prime; = &Sigma; m = 1 M i Q m
Wherein, represent the equivalent active current controlling value of m typhoon group of motors in wind energy turbine set, meet represent the equivalent reactive current control value of m typhoon group of motors in wind energy turbine set, meet
In wind energy turbine set, equivalent Wind turbines number of units M value is positioned at the minimum equivalent number of units N of Wind turbines minand in wind energy turbine set between actual Wind turbines number of units N, i.e. N min≤ M≤N; The minimum equivalent number of units N of Wind turbines mindetermine in such a way:
(1) the Wind turbines number of units NG calculated minbe integer, then the minimum equivalent number of units of Wind turbines equals the Wind turbines number of units of calculating, i.e. N min=NG min;
(2) the Wind turbines number of units NG calculated minbe not integer, then the Wind turbines number of units that the minimum equivalent number of units of Wind turbines equals to calculate adds 1, i.e. N min=NG min+ 1.
NG minfor the Wind turbines number of units calculated, meet:
NG min = P tot P N
Wherein, P totrepresent the active power that wind energy turbine set is total, P nrepresent the rated power of Wind turbines.
In described step 4, for each Voltage Drop level selected, respectively by i p_totwith i ' p_tot, and i q_totwith i ' q_totcompare, obtain the equivalent number of units of best Wind turbines corresponding to each Voltage Drop level; And in selected Voltage Drop level, select the equivalent number of units of minimum Wind turbines as the final equivalent number of units of Wind turbines.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.

Claims (8)

1., based on a wind energy turbine set equivalence method for control strategy during low voltage crossing, during low voltage crossing, the control strategy of Wind turbines comprises real power control strategy and idle control strategy; It is characterized in that: said method comprising the steps of:
Step 1: the active current controlling value and the reactive current control value that calculate Wind turbines;
Step 2: calculate the actual active current controlling value sum of wind energy turbine set under different Voltage Drop levels and actual reactive current control value sum respectively;
Step 3: calculate the equivalent active current controlling value sum of wind energy turbine set under different Voltage Drop levels and equivalent reactive current control value sum respectively;
Step 4: the final equivalent number of units determining Wind turbines.
2. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 1, is characterized in that: described step 1 comprises the following steps:
Step 1-1: according to the active current controlling value i of real power control policy calculation Wind turbines p;
Step 1-2: the reactive current control value i calculating Wind turbines according to idle control strategy q;
Step 1-3: to i pand i qrevise.
3. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 2, it is characterized in that: in described step 1-1, the control mode taked according to real power control strategy calculates the active current controlling value of Wind turbines respectively, is specially:
(1) when real power control strategy takes the control mode based on initial power, i pbe expressed as:
i P = P init V k
(2) when real power control strategy takes the control mode of specified current flow, i pbe expressed as:
i P＝i Pcon
(3) when real power control strategy is taked to specify the control mode of active power, i pbe expressed as:
i P = P con V k
Wherein, P initrepresent initial active power, V krepresent the Voltage Drop level selected, i pconactive current control objectives value during representing low voltage crossing, P conrepresent the active power controller desired value during low voltage crossing.
4. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 2, it is characterized in that: in described step 1-2, the control mode taked according to idle control strategy calculates the reactive current control value of Wind turbines respectively, is specially:
(1) when idle control strategy takes the control mode based on voltage, i qbe expressed as:
i Q＝k Q(V ref-V k)
(2) when idle control strategy takes the control mode of specified current flow, i qbe expressed as:
i Q＝i Qcon
(3) when idle control strategy is taked to specify the control mode of reactive power, i qbe expressed as:
i Q = Q con V k
Wherein, k qrepresent Wind turbines set end voltage design factor, V refrepresent the Voltage Drop horizontal reference value selected, i qconreactive current control desired value during representing low voltage crossing, Q conrepresent the Reactive Power Control desired value during low voltage crossing.
5. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 2, is characterized in that: in described step 1-3, and maximum current amplitude limit value, active current amplitude limit value and reactive current amplitude limit value use i respectively lim, i plimand i qlimrepresent, be divided into following two kinds of situations to i pand i qrevise:
(1), when taking active current to control preferential control mode, have:
(1-1) calculate active current amplitude limit value, it equals maximum current amplitude limit value, i.e. i plim=i lim;
If (1-2) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim;
(1-3) calculate reactive current amplitude limit value, have
If (1-4) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2), during the control mode taking reactive current control preferential, have:
(2-1) calculate reactive current amplitude limit value, it equals maximum current amplitude limit value, i.e. i qlim=i lim;
If (2-2) reactive current control value is less than reactive current amplitude limit value, i.e. i q< i qlim, i qremain unchanged; Otherwise reactive current control value equals reactive current amplitude limit value, i.e. i q=i qlim;
(2-3) calculate active current amplitude limit value, have
If (2-4) active current controlling value is less than active current amplitude limit value, i.e. i p< i plim, i premain unchanged; Otherwise active current controlling value equals active current amplitude limit value, i.e. i p=i plim.
6. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 1, it is characterized in that: in described step 2, if actual Wind turbines has N platform in wind energy turbine set, in wind energy turbine set, actual active current controlling value sum and actual reactive current control value sum use i respectively p_totand i q_totrepresent, have:
i P _ tot = &Sigma; n = 1 N i P n
i Q _ tot = &Sigma; n = 1 N i Q n
Wherein, represent the actual active current controlling value of the n-th typhoon group of motors in wind energy turbine set, meet represent the actual reactive current control value of the n-th typhoon group of motors in wind energy turbine set, meet
7. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 1, it is characterized in that: in described step 3, if equivalent Wind turbines has M platform in wind energy turbine set, in wind energy turbine set, equivalent active current controlling value sum and equivalent reactive current control value sum use i ' respectively p_totwith i ' q_totrepresent, have:
i P _ tot &prime; = &Sigma; m = 1 M i P m
i Q _ tot &prime; = &Sigma; m = 1 M i Q m
Wherein, represent the equivalent active current controlling value of m typhoon group of motors in wind energy turbine set, meet represent the equivalent reactive current control value of m typhoon group of motors in wind energy turbine set, meet
8. the wind energy turbine set equivalence method based on control strategy during low voltage crossing according to claim 1, is characterized in that: in described step 4, for each Voltage Drop level selected, respectively by i p_totwith i ' p_tot, and i q_totwith i ' q_totcompare, obtain the equivalent number of units of best Wind turbines corresponding to each Voltage Drop level; And in selected Voltage Drop level, select the equivalent number of units of minimum Wind turbines as the final equivalent number of units of Wind turbines.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576654A (en) * 2016-01-08 2016-05-11 南方电网科学研究院有限责任公司 Equivalent method and system of direct-driven wind power plant
CN109474028A (en) * 2018-12-04 2019-03-15 三峡大学 Based on system stability optimal control method under power grid friendly DFIG control strategy

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