CN114465244A - Large wind farm reactive voltage control method and device considering voltage regulation margin - Google Patents

Large wind farm reactive voltage control method and device considering voltage regulation margin Download PDF

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Publication number
CN114465244A
CN114465244A CN202111600469.5A CN202111600469A CN114465244A CN 114465244 A CN114465244 A CN 114465244A CN 202111600469 A CN202111600469 A CN 202111600469A CN 114465244 A CN114465244 A CN 114465244A
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reactive
wind
turbine generator
wind turbine
voltage
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Inventor
柴赟
李艺丰
仇晨光
朱涛
沈凤杰
黄曲粲
杨丽
刘财华
段接迎
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System 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
    • H02J3/50—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
    • 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

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

Abstract

The invention discloses a large wind farm reactive voltage control method and device considering voltage regulation margin, wherein the method comprises the following steps: firstly, calculating a reactive compensation demand value of a wind power plant through a reactive power setting layer; secondly, the reactive power distribution layer considers the voltage regulation margins of the reactive power compensation device and the wind turbine generator, and selects a corresponding reactive power compensation method according to the voltage regulation margins: preferably, a reactive compensation device configured in a wind power plant is selected for reactive regulation, and if the compensation device cannot meet the voltage stability requirement, reactive compensation values are distributed according to a reactive capacity proportional algorithm according to the running state of each wind turbine; a grid-side converter of the wind turbine generator adopts self-adaptive droop control to realize maximum reactive capacity compensation, and if a reactive shortage still exists, the wind turbine generator needs to be subjected to load shedding control to realize reactive support on the voltage of a power grid; finally, the wind power plant provides enough reactive support by coordinately controlling the wind turbine generator and the reactive power compensation device, so that the voltage of a grid connection point is kept stable.

Description

Large wind farm reactive voltage control method and device considering voltage regulation margin
Technical Field
The invention relates to a large wind power plant reactive voltage control method and device considering voltage regulation margin, and belongs to the technical field of power system automation.
Background
The new energy can replace the traditional energy and can be widely applied to the electric power system. Renewable energy represented by wind power generation is developed rapidly, but large-scale wind power integration has adverse effects on safe and stable operation of a system, and is mainly reflected in the aspects of voltage, frequency, subsynchronous oscillation and the like. The wind power plant in China generally adopts centralized control, when the wind power plant is influenced by wind speed fluctuation, the reactive loss of a line is increased, and the risk of grid-connected voltage out-of-limit exists, so that the safety and stability of a power system are influenced. In recent years, many large-scale wind turbine generator interlocking and grid-off accidents occur in China, and are closely related to wind power plant reactive power and voltage control. At present, researches for improving the reactive power level of a wind power plant and the voltage quality of a grid connection point at home and abroad are mainly carried out from two aspects: and configuring reactive compensation equipment in the system to ensure the voltage stability of the wind power plant, or making a reactive control scheme measure of the wind power plant from the wind power plant.
Both a main-flow Doubly Fed Induction Generator (DFIG) and a Permanent Magnet direct drive Generator (PMSG) can participate in dynamic reactive power control of a power grid by utilizing their own reactive power regulation capabilities. When the power grid drops down less, the wind turbine generator can be compensated in situ by means of reactive compensation of the wind turbine generator. Compared with a double-fed type wind turbine generator, the permanent magnet direct-drive wind turbine generator has better reactive voltage characteristics, and the important means of reactive voltage control is provided by using the reactive power regulation capacity of the permanent magnet direct-drive wind turbine generator to provide reactive support for a system. When the system voltage is reduced, the grid-side converter of the permanent magnet direct-drive wind turbine generator system can quickly provide certain reactive support for the power grid by adjusting active and reactive decoupling control. In addition, the wind speed in the future time period can be predicted, and reactive output among the wind power plant units is distributed in advance based on the active power prediction value, so that the control speed is increased, and the voltage stability of a grid-connected point is guaranteed.
The existing research method is characterized in that the reactive output characteristic of the wind power plant is analyzed by combining the adjusting capability of the wind turbine generator and the reactive compensation device, so that an optimal control strategy which can adapt to the running state of the wind power plant and adjust the reactive compensation method is needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a large wind power plant reactive voltage control method and device considering voltage regulation margin, and solves the problem that compensation method adjustment is not carried out according to system voltage regulation margin in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a large wind farm reactive voltage control method and device considering voltage regulation margin, including a wind farm, wherein a reactive compensation device and a wind turbine generator are configured in the wind farm, and the method is applied to the wind farm and comprises the following steps:
under a voltage mode, calculating a total reactive demand value of the whole wind power plant;
judging whether the reactive compensation requirement is met, carrying out reactive adjustment through a reactive compensation device when the reactive compensation requirement is met, and carrying out reactive compensation by using a wind turbine generator if the reactive compensation device cannot meet the reactive compensation quantity;
and judging whether the reactive capacity of the wind turbine generator is sufficient, when the reactive capacity of the wind turbine generator is sufficient, operating the wind turbine generator in a self-adaptive droop control mode, and when the reactive capacity of the wind turbine generator is insufficient, operating the wind turbine generator in a load shedding control mode.
Furthermore, when the wind turbine generator runs in the self-adaptive droop control mode, the grid-side converter of the wind turbine generator is provided with a self-adaptive droop coefficient, the droop coefficient is automatically adjusted along with the change of the wind speed, and the reactive output of each unit is reasonably distributed to support the voltage of a grid-connected point.
Furthermore, when the wind turbine generator runs in a load shedding control mode, a corresponding load shedding method is adopted according to wind speed change, the rotating speed of the rotor is adjusted, load shedding is realized by combining pitch angle control, reactive power output is increased, and the grid-side converter keeps self-adaptive droop control.
Further, the method also comprises the step of receiving a reactive instruction issued by a superior level as a reactive total demand value of the wind power plant.
Further, in the voltage mode, calculating a total reactive demand value of the whole wind farm, including:
taking the grid-connected point voltage as a control object, and taking the grid-connected point reference voltage UrefAnd actual operating voltage UcurComparing, obtaining deviation voltage delta U, and obtaining total reactive power demand Q of the whole wind power plant by using a proportional integral controllerrefThe formula is as follows:
Qref＝KP(Uref-Ucur)+KI∫(Uref-Ucur)dt (1)
in the formula: kP、KIAre respectively a proportional integral coefficient, KPIs set to UcurAnd the ratio of the reactance of the power transmission line between the grid-connected point and the bus of the wind power plant; kIThe adjustment is made empirically.
Further, when the wind turbine generator operates in the adaptive droop control mode, the reactive current output of the adaptive droop control link is defined as:
Figure BDA0003431534730000031
Figure BDA0003431534730000032
in the formula: vsysIs an effective value of voltage, VnomThe voltage is a rated voltage value, and the voltage is a rated voltage value,
Figure BDA0003431534730000033
is a self-adaptive droop coefficient which is in direct proportion to the reactive power of the wind turbine generator, QW,iThe reactive power of the No. i wind turbine generator is obtained; c is a constant coefficient.
Further, the control method for the wind turbine generator to operate in the load shedding control mode comprises the following steps:
determining the minimum value Q of reactive power supplied to a grid-connected point under the condition of ensuring the grid-connected voltage to be stableLBecause the output power of the wind turbine generator meets the requirement
Figure BDA0003431534730000041
And the closer the wind turbine generator is to the rated state, the greater the reactive capacity released by the same load shedding power is, so the load shedding priority of each generator needs to be judged, and the wind turbine generator is selected for load shedding control.
Further, the wind turbine generator operates in a load shedding control mode, is divided into three wind speed intervals of low, medium and high according to the wind speed, and adopts different load shedding control methods in each interval, and comprises the following steps:
in a low wind speed interval, the wind turbine generator is in a maximum power tracking running state, and at the moment, the wind energy capture coefficient reaches the maximum CpmaxThe pitch angle beta is 0 degrees, and when d% of load reduction is needed, C is calculated according to a curve of the tip speed ratio-wind energy capture coefficientpmaxTip speed ratio λ corresponding to d% reductiond1Further, the reference speed omega of the rotor after load shedding is obtainedd1；
In the middle wind speed interval, the wind turbine generator is also in the maximum power tracking running state, and the rotor is in the optimal rotating speed omegaoptCorresponding to active power of PoptWhen d% load shedding is needed, if the rotor speed reaches the maximum allowable speed omega in the process of overspeed load sheddingmaxAnd then, the load shedding is realized by matching with the pitch angle control, and the reference power of the pitch angle control is set as follows:
Figure BDA0003431534730000042
in the high wind speed interval, when vW2<vW<vWnIn the time, the wind turbine generator is in a constant rotating speed operation mode, and when d% of load reduction is needed, the wind energy capture coefficient C after load reduction is calculatedpdAnd solving the pitch angle beta by using the Newton methoddIs adjusted when v isWn<vW<vW_outIn the time, the wind turbine generator is in a constant power operation mode, and the output power of the wind turbine generator is the rated power PnWhen d% of load shedding is needed, the reference power is only set to be (1-d%) PnAnd (4) finishing.
In a second aspect, the present invention provides a large wind farm reactive voltage control device considering voltage regulation margin, including a wind farm, in which a reactive compensation device and a wind turbine are configured, the device applied to the wind farm, including:
the calculating unit is used for calculating a total reactive demand value of the whole wind power plant in a voltage mode;
the first judgment unit is used for judging whether the reactive compensation requirement is met, when the reactive compensation requirement is met, reactive adjustment is carried out through the reactive compensation device, and if the reactive compensation device cannot meet the reactive compensation amount, reactive compensation is carried out through the wind turbine generator;
and the second judgment unit is used for judging whether the reactive capacity of the wind turbine generator is sufficient or not, when the reactive capacity of the wind turbine generator is sufficient, the wind turbine generator operates in a self-adaptive droop control mode, and when the reactive capacity of the wind turbine generator is insufficient, the wind turbine generator operates in an unloading control mode.
In a third aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the methods described above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a large wind power plant reactive voltage control method and device considering voltage regulation margin, wherein a reactive compensation device configured in a wind power plant is preferentially selected for reactive regulation, if the compensation device cannot meet the voltage stability requirement, a reactive compensation value is distributed according to a reactive capacity proportion algorithm according to the operation state of each wind power plant, a grid-side converter of each wind power plant adopts self-adaptive droop control to realize maximum reactive capacity compensation, if a reactive vacancy still exists, the wind power plant needs to carry out load shedding control on the wind power plant to realize reactive support on the voltage of a power grid, and finally, the wind power plant provides enough reactive support through coordinately controlling the wind power plant and the reactive compensation device, so that the voltage of a grid-connected point is kept stable, and the problem that the compensation method adjustment is not carried out according to the voltage regulation margin in the prior art is solved.
Drawings
Fig. 1 is a flow chart of reactive voltage control provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a wind farm reactive voltage hierarchical control structure provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a reactive power setting link of a wind power plant provided by the embodiment of the invention;
FIG. 4 is a flow chart of reactive power distribution provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of an adaptive droop control link according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a load shedding control curve of a wind turbine generator according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment introduces a large-scale wind farm reactive voltage control method considering voltage regulation margin, which includes a wind farm, wherein a reactive power compensation device and a wind turbine generator are configured in the wind farm, and the method is applied to the wind farm and includes:
under a voltage mode, calculating a total reactive demand value of the whole wind power plant;
judging whether the reactive compensation requirement is met, carrying out reactive adjustment through a reactive compensation device when the reactive compensation requirement is met, and carrying out reactive compensation by using a wind turbine generator if the reactive compensation device cannot meet the reactive compensation quantity;
and judging whether the reactive capacity of the wind turbine generator is sufficient, when the reactive capacity of the wind turbine generator is sufficient, operating the wind turbine generator in a self-adaptive droop control mode, and when the reactive capacity of the wind turbine generator is insufficient, operating the wind turbine generator in a load shedding control mode.
The method for controlling the reactive voltage of the large wind farm considering the voltage regulation margin provided by the embodiment specifically relates to the following steps:
step 1, establishing a layered control consisting of a wind power plant reactive power setting layer and a wind turbine generator reactive power distribution layer, wherein the reactive power setting layer determines a reactive power reference value output to a grid-connected point by the wind power plant, the wind turbine generator reactive power distribution layer considers a system voltage regulation margin to distribute compensation quantity, and then establishing a wind turbine generator grid-connected operation model of a large-scale wind power plant;
and 2, the wind power plant reactive power setting layer takes the grid-connected point voltage as a control object, the wind power plant can perform reactive power setting according to the system set voltage in a fixed voltage mode, the grid-connected point reference voltage and the actual operating voltage are subjected to difference, the deviation voltage is obtained, the total reactive power demand of the whole wind power plant is obtained by using a proportional-integral controller, and a reactive power instruction issued by a higher level can be received to serve as the reactive power demand value of the wind power plant.
And 3, distributing the reactive compensation amount calculated in the step 2 to the wind turbine and the reactive compensation equipment by the reactive distribution layer of the wind turbine according to the running state of the wind power plant, considering the voltage regulation margin of the system and according to the reactive capacity proportion. Firstly, SVC is adopted for reactive compensation, and if the SVC can not meet the reactive compensation amount, the wind turbine generator is used for reactive compensation.
And 4, judging the reactive adjustable capacity of the wind power plant, and if the adjustable capacity of the wind turbine meets the reactive compensation quantity, executing the step 5, wherein the grid-side converter of the wind turbine adopts self-adaptive droop control. And if the adjustable capacity of the wind turbine generator cannot completely meet the reactive power adjustment requirement of the system, executing the step 6, and performing load shedding control on part of the wind turbine generator.
Step 5, the wind turbine generator sets adopt adaptive droop control, a reactive power control link of a grid-side converter is provided with an adaptive droop coefficient, the adaptive droop coefficient can be automatically adjusted along with the change of wind speed, the reactive power output of each set is reasonably distributed to support the voltage of a grid-connected point, and the stable operation of a system is guaranteed;
and 6, adopting a load shedding operation mode by the wind turbine generator, adopting a corresponding load shedding method according to wind speed change, adjusting the rotating speed of the rotor, combining pitch angle control to realize load shedding, increasing reactive power output, and keeping self-adaptive droop control of the grid-side converter.
In step 1, the wind farm reactive voltage hierarchical control structure is shown in fig. 2. Wind power plant layer control firstly carries out wind power plant reactive power requirement setting: and if the reactive reference value obtained by setting is larger than the reactive output value of the wind power plant, indicating that reactive output shortage exists. Because static var compensator has the advantage that dynamic response speed is fast, SVC is adopted at first when carrying out reactive power adjustment, if SVC can't satisfy reactive power compensation volume, need judge wind-powered electricity generation field reactive adjustable capacity, if wind turbine generator system adjustable capacity satisfies reactive power compensation volume, then wind turbine generator system net side converter adopts self-adaptation droop control, according to the compensation volume adjustment output power who distributes each unit, provides reactive support. If the adjustable capacity of the wind turbine generator cannot completely meet the reactive power adjustment requirement of the system, load shedding control needs to be carried out on part of the wind turbine generator to increase the maximum reactive power capacity of the wind turbine generator and provide sufficient reactive power support for a grid-connected point
And 3, a reactive power requirement setting link of the wind power plant is used for determining a reactive power reference value output to a grid connection point by the wind power plant. The wind power plant can perform reactive power setting according to the system set voltage in a constant voltage mode, and can also receive a reactive power instruction issued by a higher level as a reactive power demand value of the wind power plant.
If the reactive instruction value of the electric field arranged by the upper-level dispatching is available, the reactive instruction value is issued to the wind power plant, and Q is setref＝Qset. If the constant voltage mode is selected, the grid-connected point voltage is used as a control object, and the grid-connected point reference voltage U is usedrefAnd actual operating voltage UcurComparing, obtaining deviation voltage delta U, and obtaining total reactive power demand Q of the whole wind power plant by using a proportional integral controllerrefThe specific process is shown in fig. 3.
The reactive reference value of the wind power plant is as follows:
Qref＝KP(Uref-Ucur)+KI∫(Uref-Ucur)dt (1)
in the formula: kP、KIAre respectively a proportional integral coefficient, KPIs set to UcurAnd the ratio of the reactance of the power transmission line between the grid-connected point and the bus of the wind power plant; kIThe adjustment is made empirically.
In step 4, the distribution principle of the reactive power distribution layer of the wind turbine generator is shown in fig. 4, and firstly, the voltage regulation margin of the system is considered and the reactive power compensation mode is selected. And secondly, distributing the compensation quantity determined by the setting layer to the SVC and the wind turbine generator according to the compensation capacity of the SVC and the reactive capacity of the wind turbine generator. And finally, controlling the converter of the wind turbine generator to output reactive power according to the distribution value.
QcompAmount of reactive compensation, Q, to be provided for a wind power systemavaThe reactive compensation amount can be provided for the wind power system. The permanent magnet direct-drive wind turbine generator has the advantages that the reactive power regulation speed of the permanent magnet direct-drive wind turbine generator is high, but the communication between the wind turbine generator and a control system can cause the reactive power regulation speed of the wind turbine generator to be low, so that when the reactive power capacity is larger than the compensation quantity, the wind power plant reactive power compensation device SVC is preferentially considered, and millisecond-level reactive power compensation can be carried out on a grid-connected point.
Reactive compensation quantity Q required to be provided by wind power plantcompComprises the following steps:
Qcomp＝Qref－Qout
calculating the reactive power adjustable quantity of the SVC and the wind turbine generator:
QSVCava＝QSVCmax－QSVCout
QWiava＝QWimax－QWiout
in the formula: qSVCava、QSVCmax、QSVCoutRespectively the adjustable capacity, the maximum reactive compensation quantity and the current reactive output of the SVC; qWiava、QWimax、QWioutThe adjustable capacity, the maximum reactive compensation quantity and the current reactive output of the ith wind turbine generator set are respectively.
If SVC is used alone to provide reactive compensation, its capability cannot meet the reactive demand of the system, i.e. QSVCmax＜QcompAnd if so, adding the wind turbine generator to perform coordination control, and distributing the reactive compensation quantity of the wind turbine generator according to the reactive capacity proportion of each generator. Reactive compensation distribution coefficient k of wind turbine generatoriComprises the following steps:
Figure BDA0003431534730000091
in the formula: qWiThe reactive capacity of the ith wind power generation set is shown, and n is the number of the sets in the wind power plant.
The reactive compensation quantity of the wind power plant is QWcompReactive compensation Q distributed to ith wind turbine generator setWicompComprises the following steps:
QWicomp＝(Qcomp-QSVCava)ki
the reactive capacity of the wind turbine is determined by the active power and the apparent power of the wind turbine, whether the reactive compensation distribution amount of the wind turbine is larger than the reactive capacity of the wind turbine is judged at first, and when the reactive power regulation margin of the wind turbine is insufficient, the distribution scheme needs to be adjusted. Setting the number of wind generation sets with reactive power regulation margin shortage as m, wherein the reactive capacity Q of the jth wind generation setj' is:
QWjcomp'＝QWjcomp-QWj
the reactive compensation quantity distribution coefficient k of the j th wind turbine generator set after adjustmentj' is:
Figure BDA0003431534730000101
the distribution coefficient of other wind turbines is adjusted to ki', the reactive compensation quantity is QWicomp’：
Figure BDA0003431534730000102
QWicomp'＝QWicompki'
When the reactive capacity is smaller than the compensation amount, the wind turbine generator needs to be subjected to load shedding control while SVC is adopted for compensation, and the reactive capacity of the wind turbine generator is improved by reducing part of active output to support the voltage of a grid connection point.
In step 5, the grid-side converter in the converter adopts adaptive droop control, the droop coefficient setting principle is based on the current reactive capacity of the wind turbine generator, and the adaptive droop link is shown in fig. 5. The reactive current output of the self-adaptive droop control link is defined as:
Figure BDA0003431534730000103
Figure BDA0003431534730000104
in the formula: vsysIs an effective value of voltage, VnomThe voltage is a rated voltage value, and the voltage is a rated voltage value,
Figure BDA0003431534730000105
is a self-adaptive droop coefficient which is in direct proportion to the reactive power of the wind turbine generator, QW,iThe reactive power of the No. i wind turbine generator is obtained; c is a constant coefficient.
The self-adaptive droop coefficient is a variable related to space and time, can be adjusted in a self-adaptive mode along with the change of wind speed, and controls the wind turbine generator to provide reactive support according to the reactive capacity of the wind turbine generator.
In step 6, the method for controlling the load shedding operation mode comprises the following steps:
determining the minimum value Q of reactive power to be supplied to a grid-connected point under the condition of ensuring the grid-connected voltage to be stableLBecause the output power of the wind turbine generator meets the requirement
Figure BDA0003431534730000111
The closer the wind turbine generator is to the rated state, the greater the reactive capacity released by the same load shedding power is, so that the load shedding priority of each generator needs to be judged, and the wind turbine generator is selected for load shedding control;
Figure BDA0003431534730000112
in the formula: s is the rated power of the wind turbine;
Figure BDA0003431534730000113
the active power output of the No. i wind turbine generator is obtained; Δ P is the decrement amount; delta Qw,iThe method comprises the following steps of (1) obtaining reactive increment after the No. i wind turbine generator is unloaded, wherein k is the serial number of the wind turbine generators for unloading, and j is the number of the wind turbine generators for unloading;
the relief level d% can be expressed as d% ═ Δ PW,i/PW,i。
The method for controlling the load shedding operation mode comprises the following steps: the wind speed is divided into three wind speed sections of low, medium and high according to the wind speed, and different load shedding control methods are adopted in the sections, as shown in fig. 6. In a low wind speed interval, the wind turbine generator is in a maximum power tracking running state, and at the moment, the wind energy capture coefficient reaches the maximum CpmaxThe pitch angle beta is 0 degrees, and when d% of load reduction is needed, C is calculated according to a curve of the tip speed ratio-wind energy capture coefficientpmaxTip speed ratio λ corresponding to d% reductiond1Further, the reference speed omega of the rotor after load shedding is obtainedd1；
In the middle wind speed interval, the wind turbine generator is also in the maximum power tracking running state, and the rotor is in the optimal rotating speed omegaoptCorresponding to active power of PoptWhen d% of load shedding is required, if the rotor speed reaches the maximum allowable speed omega in the process of overspeed load sheddingmaxAnd then, the load shedding is realized by matching with the pitch angle control, and the reference power of the pitch angle control is set as follows:
Figure BDA0003431534730000121
in the high wind speed interval, when vW2<vW<vWnIn the process, the wind turbine generator is in a constant rotating speed operation mode, and when the load reduction is required to be carried out by d%, the wind energy capture coefficient C after the load reduction is calculatedpdAnd solving the pitch angle beta by using the Newton methoddIs adjusted when v isWn<vW<vW_outWhen the wind turbine generator is in a constant power operation mode, the output power of the wind turbine generator is rated power PnWhen d% of load shedding is needed, the reference power is only set to be (1-d%) PnAnd (4) finishing.
Example 2
This embodiment provides a consider large-scale wind-powered electricity generation field reactive voltage controlling means of pressure regulating margin, including the wind-powered electricity generation field, dispose reactive power compensator and wind turbine generator system in the wind-powered electricity generation field, the device is applied to the wind-powered electricity generation field, includes:
the calculating unit is used for calculating a total reactive demand value of the whole wind power plant in a voltage mode;
the first judgment unit is used for judging whether the reactive compensation requirement is met, when the reactive compensation requirement is met, reactive adjustment is carried out through the reactive compensation device, and if the reactive compensation device cannot meet the reactive compensation amount, reactive compensation is carried out through the wind turbine generator;
and the second judgment unit is used for judging whether the reactive capacity of the wind generation set is sufficient or not, when the reactive capacity of the wind generation set is sufficient, the wind generation set operates in a self-adaptive droop control mode, and when the reactive capacity of the wind generation set is insufficient, the wind generation set operates in an unloading control mode.
Example 3
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the method of any one of the embodiment 1.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A large wind power plant reactive voltage control method considering voltage regulation margin is characterized by comprising a wind power plant, wherein a reactive compensation device and a wind turbine generator are configured in the wind power plant, and the method is applied to the wind power plant and comprises the following steps:
under a voltage mode, calculating a total reactive demand value of the whole wind power plant;
judging whether the reactive compensation requirement is met, carrying out reactive adjustment through a reactive compensation device when the reactive compensation requirement is met, and carrying out reactive compensation by using a wind turbine generator if the reactive compensation device cannot meet the reactive compensation quantity;
and judging whether the reactive capacity of the wind generation set is sufficient, when the reactive capacity of the wind generation set is sufficient, operating the wind generation set in a self-adaptive droop control mode, and when the reactive capacity of the wind generation set is insufficient, operating the wind generation set in a load shedding control mode.
2. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: when the wind turbine generator runs in the self-adaptive droop control mode, the wind turbine generator grid-side converter is provided with a self-adaptive droop coefficient, the droop coefficient is automatically adjusted along with the change of the wind speed, and the reactive output of each wind turbine generator is reasonably distributed to support the voltage of a grid-connected point.
3. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: when the wind turbine generator runs in a load shedding control mode, a corresponding load shedding method is adopted according to wind speed change, the rotating speed of a rotor is adjusted, load shedding is realized by combining pitch angle control, reactive power output is increased, and a grid-side converter keeps self-adaptive droop control.
4. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: the method also comprises the step of receiving a reactive instruction issued by a superior level as a reactive total demand value of the wind power plant.
5. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: under the voltage mode, calculating the total reactive demand value of the whole wind power plant, comprising the following steps:
taking the grid-connected point voltage as a control object, and taking the grid-connected point reference voltage UrefAnd actual operating voltage UcurComparing, obtaining deviation voltage delta U, and obtaining total reactive power demand Q of the whole wind power plant by using a proportional integral controllerrefThe formula is as follows:
Qref＝KP(Uref-Ucur)+KI∫(Uref-Ucur)dt (1)
in the formula: kP、KIAre respectively a proportional integral coefficient, KPIs set to UcurAnd the ratio of the reactance of the power transmission line between the grid-connected point and the bus of the wind power plant; kIThe adjustment is made empirically.
6. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: when the wind turbine generator system operates in the self-adaptive droop control mode, the reactive current output of the self-adaptive droop control link is defined as follows:
Figure FDA0003431534720000021
Figure FDA0003431534720000022
in the formula: vsysIs an effective value of voltage, VnomThe voltage is a rated voltage value, and the voltage is a rated voltage value,
Figure FDA0003431534720000023
is a self-adaptive droop coefficient which is in direct proportion to the reactive power of the wind turbine generator, QW,iThe reactive power of the No. i wind turbine generator is obtained; c is a constant coefficient.
7. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: the control method for the wind turbine generator to operate in the load shedding control mode comprises the following steps:
determining the minimum value Q of reactive power supplied to a grid-connected point under the condition of ensuring the grid-connected voltage to be stableLBecause the output power of the wind turbine generator meets the requirements
Figure FDA0003431534720000024
And the closer the wind turbine generator is to the rated state, the greater the reactive capacity released by the same load shedding power is, so the load shedding priority of each generator needs to be judged, and the wind turbine generator is selected for load shedding control.
8. The large wind farm reactive voltage control method considering the voltage regulation margin according to claim 1, characterized in that: the wind turbine generator system is operated in a load shedding control mode, is divided into three wind speed intervals of low, medium and high according to the wind speed, and adopts different load shedding control methods in each interval, and comprises the following steps:
in a low wind speed interval, the wind turbine generator is in a maximum power tracking running state, and at the moment, the wind energy capture coefficient reaches the maximum Cp maxThe pitch angle beta is 0 DEG whenWhen d% of load reduction is required, C is calculated according to a curve of tip speed ratio-wind energy capture coefficientp maxTip speed ratio λ corresponding to d% reductiond1Further, the reference speed omega of the rotor after load shedding is obtainedd1；
In the middle wind speed interval, the wind turbine generator is also in the maximum power tracking running state, and the rotor is in the optimal rotating speed omegaoptCorresponding to active power of PoptWhen d% load shedding is needed, if the rotor speed reaches the maximum allowable speed omega in the process of overspeed load sheddingmaxAnd then, the load shedding is realized by matching with the pitch angle control, and the reference power of the pitch angle control is set as follows:
Figure FDA0003431534720000031
in the high wind speed interval, when vW2<vW<vWnIn the time, the wind turbine generator is in a constant rotating speed operation mode, and when d% of load reduction is needed, the wind energy capture coefficient C after load reduction is calculatedpdAnd solving the pitch angle beta by using the Newton methoddIs adjusted when v isWn<vW<vW_outIn the time, the wind turbine generator is in a constant power operation mode, and the output power of the wind turbine generator is the rated power PnWhen d% of load shedding is needed, the reference power is only set to be (1-d%) PnAnd (4) finishing.
9. The utility model provides a consider large-scale wind-powered electricity generation field reactive voltage controlling means of pressure regulating margin which characterized in that, includes the wind-powered electricity generation field, dispose reactive compensation device and wind turbine generator system in the wind-powered electricity generation field, the device is applied to the wind-powered electricity generation field, includes:
the calculating unit is used for calculating a total reactive demand value of the whole wind power plant in a voltage mode;
the first judgment unit is used for judging whether the reactive compensation requirement is met, when the reactive compensation requirement is met, reactive adjustment is carried out through the reactive compensation device, and if the reactive compensation device cannot meet the reactive compensation amount, reactive compensation is carried out through the wind turbine generator;
and the second judgment unit is used for judging whether the reactive capacity of the wind turbine generator is sufficient or not, when the reactive capacity of the wind turbine generator is sufficient, the wind turbine generator operates in a self-adaptive droop control mode, and when the reactive capacity of the wind turbine generator is insufficient, the wind turbine generator operates in an unloading control mode.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that: the program when executed by a processor implements the steps of the method of any one of claims 1 to 8.
CN202111600469.5A 2021-12-24 2021-12-24 Large wind farm reactive voltage control method and device considering voltage regulation margin Pending CN114465244A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115936924A (en) * 2022-12-14 2023-04-07 广西电网有限责任公司 Wind power plant wind energy prediction method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115936924A (en) * 2022-12-14 2023-04-07 广西电网有限责任公司 Wind power plant wind energy prediction method and system
CN115936924B (en) * 2022-12-14 2023-08-25 广西电网有限责任公司 Wind energy prediction method and system for wind power plant

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