CN111740428A - Reactive power voltage regulation control method for wind turbine generator cluster - Google Patents

Reactive power voltage regulation control method for wind turbine generator cluster Download PDF

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CN111740428A
CN111740428A CN202010529945.8A CN202010529945A CN111740428A CN 111740428 A CN111740428 A CN 111740428A CN 202010529945 A CN202010529945 A CN 202010529945A CN 111740428 A CN111740428 A CN 111740428A
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wind turbine
turbine generator
voltage
reactive power
reactive
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应有
杨靖
孙勇
许国东
孟明
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Zhejiang Windey Co Ltd
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Zhejiang Windey Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a reactive power voltage regulation control method for a wind turbine generator cluster, which comprises the following steps: analyzing the sensitivity of the reactive power of each unit to the voltage of a public connection point of a wind turbine cluster connected to a power grid; determining reactive power voltage regulation constraint conditions; selecting a wind turbine generator with the highest sensitivity coefficient, and determining the adjustment quantity of the reactive power of the wind turbine generator; correcting reactive power regulating quantity according to reactive power capability constraint of the wind turbine generator and outlet voltage constraint of the wind turbine generator; calculating the influence of the wind turbine generator on the voltage of the common connection point; judging whether the reactive power regulating quantity of the wind turbine generator meets a voltage operation target or not; and each set responds to the corresponding reactive power regulating variable to realize voltage regulation. According to the technical scheme, no electric element is required to be added, only the complementarity between the wind turbine generators is utilized, and the network reactive loss and the impact of wind power on the stability of a power grid are reduced through optimal configuration or coordinated control, so that the reliability of wind power grid connection and the system voltage stability are improved.

Description

Reactive power voltage regulation control method for wind turbine generator cluster
Technical Field
The invention relates to the field of wind power control, in particular to a reactive power voltage regulation control method for a wind turbine generator cluster.
Background
The distributed wind turbine group is generally located near a user, is mainly consumed on the spot, and adopts a grid connection mode of multipoint access and unified monitoring. After the distributed wind turbine generator set is connected to a power distribution network, the energy loss, the voltage level, the short-circuit current and the like of the power distribution system are greatly influenced, the single electric energy distribution mode of the original power distribution network is changed, and the mode is changed into an electric energy exchange mode integrating electric energy receiving, transmitting and distributing. The characteristics of the distributed wind power and large-scale access to a large power grid and the characteristics of distributed small capacity are obviously different, the distributed wind power and the distributed small-capacity wind power are subject to specific technical problems, and the problem of influence of the distributed wind power on the voltage of a power distribution network is obvious. Therefore, the complementarity between wind generation sets with dispersed regions is considered, the network loss and the impact of wind power on a power grid are reduced through optimal configuration or coordinated control, and the reliability of wind power grid connection and the voltage stability are improved.
Wind generating set, box type transformer, current collection circuit and main transformer all belong to high-sensitivity equipment in wind-powered electricity generation field electrical system, have led to the current situation that the unit reactive power demand increases. At present, reactive layered partitioning and local balance are realized mainly by adding a reactive compensation device in the construction of a wind power plant.
Data show that the wind power plant mainly maintains the stability of the grid voltage by installing a reactive voltage regulating device at present. The static reactive compensator, the static reactive generator and the on-load tap changer can be used as reactive voltage adjusting devices. The technology specifically realizes the voltage regulation scheme as follows: when the wind power of the wind power plant is small or no wind, the wind power of the wind power plant is sent out of the system to run under light load, the capacitive reactive power of the power transmission line is large at the moment, the sending out of the system is capacitive, the inductive reactive power compensation device is installed to compensate the charging power of the line, and the voltage of the system is limited within a reasonable range; when the wind power of a wind power plant is high or the wind power level is high, the wind power sending system of the wind power plant operates in a heavy load mode, a current collecting circuit and transformers of various voltage levels of the wind power plant can consume a large amount of reactive power, and in order to compensate the reactive power consumed by the transformers and the sending circuit of the wind power plant, a capacitive reactive compensation device is installed to provide capacitive reactive power for the system so as to achieve the purpose of maintaining the voltage of the system and improve the voltage stability of the system.
The reactive compensation device is added in the construction of the wind power plant to adjust the system voltage, so that the structure of an electric system of the wind power plant is complicated, and the investment cost is increased; meanwhile, the reactive power compensation device mainly comprises a capacitor and a reactor, so that a large amount of harmonic waves can be brought to the power system while the reactive power is smoothly changed and the voltage of a power grid is adjusted, so that impact is brought to the power system, and serious harm is caused.
Chinese patent document CN107671414A discloses an "ultrasonic welding method for lithium ion battery tab and tab welding protection method". Adopt
Disclosure of Invention
The invention mainly solves the technical problem that the original reactive power compensation device can bring a large amount of harmonic waves to a power system while changing the reactive power and adjusting the voltage of the power grid so as to bring impact to the power system, and provides the reactive power voltage-adjusting control method of the wind turbine generator cluster.
The technical problem of the invention is mainly solved by the following technical scheme: the invention comprises the following steps:
(1) analyzing the sensitivity of the reactive power of each unit to the voltage of a public connection point of a wind turbine generator cluster connected to a power grid; in the sensitivity analysis, the influence of the reactive power of each dispersed wind turbine generator on the voltage of the common connection point can be reflected by the sensitivity value on the first row in the sensitivity matrix. The larger the sensitivity value is, the more obvious the effect of the reactive power regulation of a certain unit on the voltage of the common connection point is shown.
(2) Determining reactive power voltage regulation constraint conditions;
(3) selecting a wind turbine generator with the highest sensitivity coefficient, and determining the adjustment quantity of the reactive power of the wind turbine generator;
(4) correcting the reactive power regulating quantity of the wind turbine generator according to the reactive power capability constraint of the wind turbine generator;
(5) correcting the reactive power regulating quantity of the wind turbine generator according to the outlet voltage constraint of the wind turbine generator;
(6) calculating the influence of the wind turbine generator on the voltage of the common connection point according to the sensitivity coefficient and the reactive power regulating quantity of the wind turbine generator;
(7) judging whether the reactive power regulating quantity of the wind turbine generator meets a voltage operation target, if so, entering a step (9), and if not, entering a step (8);
(8) removing the wind turbine generator with the determined power regulation quantity, and entering the step (3);
(9) and each set responds to the corresponding reactive power regulating variable to realize voltage regulation.
Preferably, in step 1, the sensitivity equation of the reactive power of each unit to the voltage of the common connection point is as follows:
Figure BDA0002534845150000031
where Δ P is the active power change of the node, Δ Q is the reactive power change of the node, JH、JN、JJ、JLIs a Jacobian block matrix in a power flow equation, which is respectively
Figure BDA0002534845150000032
Figure BDA0002534845150000033
i. j is the node number and is the number of the node,delta theta is the node voltage phase angle deviation, delta U is the ratio of the node voltage amplitude deviation to the rated voltage amplitude;
the voltage deviation of the public connection point is mainly caused by the change of reactive power, and the relation between the voltage deviation and the reactive power is as follows:
Figure BDA0002534845150000034
the reactance of the transmission line is much larger than the resistance, and the above formula can be simplified as follows:
ΔQ＝JLΔU
ΔQ＝-UB”ΔU
where U is the node voltage,
ΔU＝-(B”)-1U-1ΔQ
then, the sensitivity matrix of the reactive power of each unit to the voltage of the common connection point is as follows:
ΔU＝-(B”)-1U-1ΔQ。
preferably, the reactive voltage regulation constraint conditions in the step 2 include wind turbine reactive power capability constraint and wind turbine outlet operation voltage constraint.
Preferably, the step 2 is to perform reactive power output constraint on the wind turbine generator, and the following formula is used:
Qjmin＜Qj＜Qjmax
the reactive power limit of the wind turbine generator is calculated by the following formula:
Figure BDA0002534845150000041
Figure BDA0002534845150000042
wherein Q issminIs the minimum value of reactive power, Q, of the doubly-fed machine setsmaxIs the maximum reactive power value of the doubly-fed unit and is the minimum reactive power value U of the unitsIs the stator voltage amplitude, XsIs the equivalent self-inductance of the generator statorAnti, XmIs generator mutual inductance, XsIs the equivalent self-inductive reactance of the generator stator, IrmaxIs the maximum value of the current, X, of the rotor-side convertersIs the equivalent self-inductive reactance, P, of the generator statorsThe active power generated by the stator of the doubly-fed wind turbine generator is provided.
Preferably, the wind turbine generator outlet operating voltage constraint in the step 2 is as follows:
Ujmin＜Uj+ΔUj＜Ujmax
wherein, UjminIs the lower limit of the wind turbine generator outlet voltage, UjIs wind turbine generator outlet voltage, UjmaxIs the upper limit of the wind turbine generator outlet voltage, Delta UjThe voltage deviation value of the outlet of the wind turbine generator is caused by reactive power regulation of the wind turbine generator.
Preferably, the calculation formula of the reactive power adjustment quantity of the unit with the highest sensitivity coefficient in step 3 is as follows:
Figure BDA0002534845150000051
wherein, is Δ QjIs the reactive power regulating variable, delta U, of the distributed unit1Is the ratio of the deviation of the voltage at the point of common connection to the rated voltage, U1refIs the ratio of the reference value of the voltage of the common connection point to the rated voltage, S1jIs the sensitivity coefficient of the reactive power of a certain unit to the voltage of the common connection point.
Preferably, in the step 4, the reactive power capability of the wind turbine generator is constrained as follows:
Qjmin-Q＜ΔQj＜Qjmax-Q
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure BDA0002534845150000052
preferably, in the step 5, the wind turbine generator outlet operating voltage is constrained as follows:
Ujmin＜Uj+ΔUj＜Ujmax
the calculation formula of the voltage deviation amount of the outlet of the wind turbine generator set caused by reactive power regulation is as follows:
ΔUj＝Sjj*ΔQj
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure BDA0002534845150000053
preferably, in step 6, the wind turbine generator has an influence on the voltage of the common connection point, and the calculation formula is as follows:
Figure BDA0002534845150000061
wherein: n is the number of the distributed units plus 1;
the voltage at the point of common connection caused by the final reactive regulation is calculated as follows:
U1＝U1+ΔU1。
preferably, the step 7 judges whether the adjustment amount meets the requirement according to the following steps:
0.98U1ref≤U1≤1.02U1ref
if the voltage operation requirement is met, entering step 9; if not, go to step 8.
The invention has the beneficial effects that:
1. and analyzing the sensitivity of the reactive power of each unit to the voltage of the common connection point of the wind turbine cluster, and selecting the optimal unit and the reactive power regulating quantity.
2. The reactive limit capacity and the outlet voltage constraint of the unit are fully considered, the unit can stably run in a grid-connected mode in the process of participating in voltage regulation, and secondary impact of voltage is avoided.
3. The method has the advantages that no electric element is required to be added, the complementarity between the wind turbines is only utilized, and the reactive loss of the network and the impact of the wind power on the stability of the power grid are reduced through optimal configuration or coordinated control.
Drawings
Fig. 1 is a block diagram of a circuit schematic connection structure of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. Example (b): as shown in fig. 1, the reactive power voltage regulation control method for a wind turbine generator cluster in this embodiment includes the following steps:
(1) and analyzing the sensitivity of the reactive power of each unit to the voltage of the public connection point of the wind turbine generator cluster connected to the power grid. The sensitivity equation of the reactive power of each unit to the voltage of the public connection point is as follows:
Figure BDA0002534845150000071
where Δ P is the active power change of the node, Δ Q is the reactive power change of the node, JH、JN、JJ、JLIs a Jacobian block matrix in a power flow equation, which is respectively
Figure BDA0002534845150000072
Figure BDA0002534845150000073
i. j is the node number, delta theta is the node voltage phase angle deviation, and delta U is the ratio of the node voltage amplitude deviation to the rated voltage amplitude;
the voltage deviation of the public connection point is mainly caused by the change of reactive power, and the relation between the voltage deviation and the reactive power is as follows:
Figure BDA0002534845150000074
since the reactance of the transmission line is much larger than the resistance, the above equation can be simplified as follows:
ΔQ＝JLΔU
ΔQ＝-UB”ΔU
where U is the node voltage,
ΔU＝-(B”)-1U-1ΔQ
then, the sensitivity matrix of the reactive power of each unit to the voltage of the common connection point is as follows: delta U ═ B')-1U-1ΔQ。
(2) And determining reactive power voltage regulation constraint conditions, wherein the reactive power voltage regulation constraint conditions comprise wind turbine generator reactive power capability constraint and wind turbine generator outlet operation voltage constraint.
The reactive power output constraint of the wind turbine generator is as follows:
Qjmin＜Qj＜Qjmax
the reactive power limit of the wind turbine generator is calculated by the following formula:
Figure BDA0002534845150000081
Figure BDA0002534845150000082
wherein Q issminIs the minimum value of reactive power, Q, of the doubly-fed machine setsmaxIs the maximum reactive power value of the doubly-fed unit and is the minimum reactive power value U of the unitsIs the stator voltage amplitude, XsIs the equivalent self-inductive reactance, X, of the generator statormIs generator mutual inductance, XsIs the equivalent self-inductive reactance of the generator stator, IrmaxIs the maximum value of the current, X, of the rotor-side convertersIs the equivalent self-inductive reactance, P, of the generator statorsThe active power generated by the stator of the doubly-fed wind turbine generator is provided.
And (3) restricting the operating voltage of the outlet of the wind turbine generator, wherein the formula is as follows:
Ujmin＜Uj+ΔUj＜Ujmax
wherein, UjminIs the lower limit of the wind turbine generator outlet voltage, UjIs wind turbine generator outlet voltage, UjmaxIs the upper limit of the wind turbine generator outlet voltage, Delta UjIs that the wind turbine generator does not haveAnd (4) regulating the deviation amount of the outlet voltage of the unit caused by work regulation.
(3) And selecting the wind turbine generator with the highest sensitivity coefficient, and determining the adjustment quantity of the reactive power of the wind turbine generator. The calculation formula of the reactive power regulating quantity of the unit with the highest sensitivity coefficient is as follows:
Figure BDA0002534845150000083
wherein, is Δ QjIs the reactive power regulating variable, delta U, of the distributed unit1Is the ratio of the deviation of the voltage at the point of common connection to the rated voltage, U1refIs the ratio of the reference value of the voltage of the common connection point to the rated voltage, S1jIs the sensitivity coefficient of the reactive power of a certain unit to the voltage of the common connection point.
(4) And correcting the reactive power regulation of the wind turbine generator according to the reactive power capability constraint of the wind turbine generator.
The reactive power capability of the wind turbine generator is constrained as follows:
Qjmin-Q＜ΔQj＜Qjmax-Q
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure BDA0002534845150000091
(5) and correcting the reactive power regulating quantity of the wind turbine generator according to the outlet voltage constraint of the wind turbine generator. The operating voltage of the outlet of the wind turbine generator is constrained as follows:
Ujmin＜Uj+ΔUj＜Ujmax
the calculation formula of the voltage deviation amount of the outlet of the wind turbine generator set caused by reactive power regulation is as follows:
ΔUj＝Sjj*ΔQj
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure BDA0002534845150000092
(6) and calculating the influence of the wind turbine generator on the voltage of the common connection point according to the sensitivity coefficient and the reactive power regulating quantity of the wind turbine generator. The influence of the wind turbine generator on the voltage of the common connection point is calculated according to the following formula:
Figure BDA0002534845150000093
wherein: n is the number of distributed units plus 1.
The voltage at the point of common connection caused by the final reactive regulation is calculated as follows:
U1＝U1+ΔU1
(7) judging whether the reactive power regulating quantity of the wind turbine generator meets a voltage operation target or not according to the following judgment basis:
0.98U1ref≤U1≤1.02U1ref
and (5) if the voltage operation requirement is met, entering a step (9), and if the voltage operation requirement is not met, entering a step (8).
(8) And (4) removing the wind turbine generator with the determined power regulation amount, and entering the step (3).
(9) And each set responds to the corresponding reactive power regulating variable to realize voltage regulation.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms reactive power, sensitivity, regulation etc. are used more here, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. A reactive power voltage regulation control method of a wind turbine generator cluster is characterized by comprising the following steps:
(1) analyzing the sensitivity of the reactive power of each unit to the voltage of a public connection point of a wind turbine generator cluster connected to a power grid;
(2) determining reactive power voltage regulation constraint conditions;
(3) selecting a wind turbine generator with the highest sensitivity coefficient, and determining the adjustment quantity of the reactive power of the wind turbine generator;
(4) correcting the reactive power regulating quantity of the wind turbine generator according to the reactive power capability constraint of the wind turbine generator;
(5) correcting the reactive power regulating quantity of the wind turbine generator according to the outlet voltage constraint of the wind turbine generator;
(6) calculating the influence of the wind turbine generator on the voltage of the common connection point according to the sensitivity coefficient and the reactive power regulating quantity of the wind turbine generator;
(7) judging whether the reactive power regulating quantity of the wind turbine generator meets a voltage operation target, if so, entering a step (9), and if not, entering a step (8);
(8) removing the wind turbine generator with the determined power regulation quantity, and entering the step (3);
(9) and each set responds to the corresponding reactive power regulating variable to realize voltage regulation.
2. The reactive voltage regulation control method for the wind turbine generator cluster according to claim 1, wherein in the step 1, the sensitivity equation of the reactive power of each generator set to the voltage of the common connection point is as follows:
Figure FDA0002534845140000011
where Δ P is the active power change of the node, Δ Q is the reactive power change of the node, JH、JN、JJ、JLIs a Jacobian block matrix in a power flow equation, which is respectively
Figure FDA0002534845140000012
Figure FDA0002534845140000013
i. j is the node number, delta theta is the node voltage phase angle deviation, and delta U is the ratio of the node voltage amplitude deviation to the rated voltage amplitude;
the voltage deviation of the public connection point is mainly caused by the change of reactive power, and the relation between the voltage deviation and the reactive power is as follows:
Figure FDA0002534845140000021
the reactance of the transmission line is much larger than the resistance, and the above formula can be simplified as follows:
ΔQ＝JLΔU
ΔQ＝-UB”ΔU
where U is the node voltage,
ΔU＝-(B”)-1U-1ΔQ
then, the sensitivity matrix of the reactive power of each unit to the voltage of the common connection point is as follows:
ΔU＝-(B”)-1U-1ΔQ。
3. the reactive voltage regulation control method for the wind turbine generator cluster as claimed in claim 1, wherein the reactive voltage regulation constraint conditions of the step 2 comprise a wind turbine generator reactive power capability constraint and a wind turbine generator outlet operating voltage constraint.
4. The reactive voltage regulation control method for the wind turbine generator cluster according to claim 3, wherein in the step 2, the reactive power output of the wind turbine generator is constrained according to the following formula:
Qjmin＜Qj＜Qjmax
the reactive power limit of the wind turbine generator is calculated by the following formula:
Figure FDA0002534845140000022
Figure FDA0002534845140000023
wherein Q issminIs the minimum value of reactive power, Q, of the doubly-fed machine setsmaxIs the maximum reactive power value of the doubly-fed unit and is the minimum reactive power value U of the unitsIs the stator voltage amplitude, XsIs the equivalent self-inductive reactance, X, of the generator statormIs generator mutual inductance, XsIs the equivalent self-inductive reactance of the generator stator, IrmaxIs the maximum value of the current, X, of the rotor-side convertersIs the equivalent self-inductive reactance, P, of the generator statorsThe active power generated by the stator of the doubly-fed wind turbine generator is provided.
5. The reactive voltage regulation control method of the wind turbine generator cluster according to claim 3, wherein in the step 2, the wind turbine generator outlet operating voltage constraint is as follows:
Ujmin＜Uj+ΔUj＜Ujmax
wherein, UjminIs the lower limit of the wind turbine generator outlet voltage, UjIs wind turbine generator outlet voltage, UjmaxIs the upper limit of the wind turbine generator outlet voltage, Delta UjThe voltage deviation value of the outlet of the wind turbine generator is caused by reactive power regulation of the wind turbine generator.
6. The reactive power voltage regulation control method of the wind turbine generator cluster according to claim 1, wherein the step 3 is characterized in that the calculation formula of the reactive power regulation quantity of the generator with the highest sensitivity coefficient is as follows:
Figure FDA0002534845140000031
wherein, is Δ QjIs the reactive power regulating variable, delta U, of the distributed unit1Is the ratio of the deviation of the voltage at the point of common connection to the rated voltage, U1refIs the ratio of the reference value of the voltage of the common connection point to the rated voltage, S1jIs a certain tableAnd the sensitivity coefficient of the reactive power of the unit to the voltage of the public connection point.
7. The reactive voltage regulation control method for the wind turbine generator cluster according to claim 1, wherein in the step 4, the reactive power capability of the wind turbine generator is constrained as follows:
Qjmin-Q＜ΔQj＜Qjmax-Q
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure FDA0002534845140000032
8. the reactive voltage regulation control method of the wind turbine generator cluster according to claim 1, wherein in the step 5, the wind turbine generator outlet operating voltage constraints are as follows:
Ujmin＜Uj+ΔUj＜Ujmax
the calculation formula of the voltage deviation amount of the outlet of the wind turbine generator set caused by reactive power regulation is as follows:
ΔUj＝Sjj*ΔQj
the reactive power regulating variable correction formula of the wind turbine generator is as follows:
Figure FDA0002534845140000041
9. the reactive voltage regulation control method of the wind turbine generator cluster according to claim 1, wherein in the step 6, the influence of the wind turbine generator on the voltage of the common connection point is calculated according to the following formula:
Figure FDA0002534845140000042
wherein: n is the number of the distributed units plus 1;
the voltage at the point of common connection caused by the final reactive regulation is calculated as follows:
U1＝U1+ΔU1。
10. the reactive power voltage regulation control method of the wind turbine generator cluster according to claim 1, wherein the step 7 is used for judging whether the regulation quantity meets the requirement according to the following steps:
0.98U1ref≤U1≤1.02U1ref
if the voltage operation requirement is met, entering step 9; if not, go to step 8.
CN202010529945.8A 2020-06-11 2020-06-11 Reactive power voltage regulation control method for wind turbine generator cluster Pending CN111740428A (en)

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