CN113659639B - Wind power plant inertia response power distribution method considering rotation speed constraint - Google Patents
Wind power plant inertia response power distribution method considering rotation speed constraint Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- 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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- 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
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- 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
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Abstract
The application provides a wind power station inertia response power distribution method considering rotation speed constraint, which comprises the following steps: when the active power is deficient, determining a grid-connected wind turbine generator set with inertia response capability in the wind power plant; calculating the sum of rated capacities of the inertia response control objects of the wind farm according to the grid-connected wind turbine generator; determining short-time adjustable capacity, short-time adjustable capacity and inertia response power upward regulation limiting and downward regulation limiting of the inertia response power distribution coefficients of the grid-connected wind turbine generator in the wind power plant according to the rotation speed constraint and the converter capacity limiting conditions; and obtaining inertia response power of the wind power plant and inertia response power of the grid-connected wind turbines in the wind power plant according to the inertia response difference adjustment coefficient of the wind power plant and the sum of rated capacities of inertia response control objects of the wind power plant, transmitting the inertia response power instruction to each grid-connected wind turbine, and increasing the power of the grid-connected wind turbines to realize power support.
Description
Technical Field
The application relates to the technical field of control in a fan inertia response field, in particular to a wind power field inertia response power distribution method considering rotation speed constraint.
Background
When the active power shortage occurs in the power grid, the new energy unit represented by wind power can only support the power of the system by releasing the kinetic energy of the rotor to raise the active power in a short period due to the influence of tracking control of the maximum power point. The wind farm inertia response control is a control mode for releasing rotor kinetic energy by a fan, which is most widely applied in practical engineering, and is realized by introducing frequency difference proportion, frequency difference differential proportion and other components on the basis of tracking control of the maximum power point of an active control system of the wind farm.
However, the control mode only solves the problem of how to enable the wind farm to have frequency modulation capability. How to evaluate the frequency modulation capability of each grid-connected wind turbine generator in a wind power plant and determine the inertia response power distribution coefficients of each grid-connected wind turbine generator in different models in the wind power plant, and the problem of secondary frequency drop caused by the action of a wind turbine generator rotation speed protection device due to improper distribution of inertia response power of the grid-connected wind turbine generator in the wind power plant is still to be solved.
Disclosure of Invention
The application provides a wind power plant inertia response power distribution method considering rotation speed constraint, which aims to solve the problem of frequency secondary drop caused by action of a wind turbine generator rotation speed protection device due to misdistribution of inertia response power of a grid-connected wind turbine generator in a wind power plant.
The application provides a wind power station inertia response power distribution method considering rotation speed constraint, which comprises the following steps:
judging whether an active power deficiency occurs in a power grid, and determining a grid-connected wind turbine generator i with inertia response capability in a wind power plant when the active power deficiency occurs;
calculating rated capacity sum S of wind power plant inertia response control objects according to the grid-connected wind turbine generator system i w ；
Determining short-time adjustable capacity c of grid-connected wind turbine generator set i in wind power plant according to rotation speed constraint and converter capacity constraint conditions u,i And a short-time, down-adjustable capacity c d,i ；
According to the capacity c adjustable upwards for a short time u,i And a short-time, down-adjustable capacity c d,i The inertia response power of the wind power plant is adjusted upwards to limit, the inertia response power of the wind power plant is adjusted downwards to limit, and the inertia response power distribution coefficient of the grid-connected wind turbine generator in the wind power plant is obtained;
according to the inertia response difference adjustment coefficient of the wind power plant and the sum S of rated capacities of wind power plant inertia response control objects w Obtaining inertia response power P of wind power plant VIC_farm ；
According to the rated capacity sum S w The inertia response power P VIC_farm The inertia response power P of the grid-connected wind turbine generator set i in the wind power plant is obtained through the power distribution coefficient VIC,i ；
Transmitting the inertia response power instruction to each grid-connected wind turbine generator to increase the power P of the grid-connected wind turbine generator VIC,i And performing power support.
Optionally, determining whether the grid-connected wind turbine generator system i with inertia response capability in the wind farm has inertia response capability can be determined by the following formula:
wherein v is i The wind speed (m/s) of the grid-connected wind turbine generator system i in the wind power plant is represented; v 1,i The method comprises the steps that a corresponding lower wind speed limit (m/s) is provided when an inertial response capability is provided for a grid-connected wind turbine generator set i in a wind power plant; v n,i The wind speed is the rated wind speed (m/s) of the grid-connected wind turbine generator system i in the wind power plant, and the wind speed corresponds to the upper limit (m/s) of the wind speed when the grid-connected wind turbine generator system i in the wind power plant has inertial response capability.
Optionally, the v 1,i The calculation is carried out according to the following formula:
wherein P is w1,i The inertia response corresponding to the lowest output about is provided for the grid-connected wind turbine generator system i in the wind power plantA bundle; c (C) Pmax,i The maximum wind energy utilization coefficient of the grid-connected wind turbine generator system i in the wind power plant is set; ρ is the air density (kg/m) 3 )r i The radius (m/s) of the wind turbine blade of the grid-connected wind turbine generator set i in the wind power plant is the radius (m/s) of the wind turbine blade of the grid-connected wind turbine generator set i.
Optionally, calculating the rated capacity sum S of wind farm inertia response control objects according to the grid-connected wind turbine generator set i w Calculated from the following formula:
and n represents the number of grid-connected wind turbines in the wind power plant.
Optionally, determining the short-time up-adjustable capacity c of the grid-connected wind turbine generator set i in the wind power plant according to the rotation speed constraint and the converter capacity constraint condition u,i And a short-time, down-adjustable capacity c d,i The method comprises the following steps:
minimum rotation speed constraint of wind power plant grid-connected wind turbine generator system i and capacity-limited generator system of converter can adjust capacity c upwards in short time u,i The expression is as follows:
wherein P is w,i And P MPPT,i Respectively tracking expressions of mechanical power and maximum power of a grid-connected wind turbine generator i of the wind power plant; omega min,i Minimum rotation speed constraint (rad/s) of a grid-connected wind turbine generator system i for a wind farm; omega 2,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 2,i A corresponding rotational speed;
the capacity c of the wind power plant grid-connected wind turbine generator set with i maximum rotation speed constraint and the minimum grid-connected power constraint can be adjusted downwards in short time d,i The expression is as follows:
wherein omega 3,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 3,i Corresponding rotational speed.
Optionally, the inertia response power of the wind farm is adjusted upward to limit, and the inertia response power of the wind farm is adjusted downward to limit, which is calculated according to the following formula:
wherein P is up_LI Adjusting clipping upwardly for wind farm inertia response; c u,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted upwards in a short time; p (P) down_LI Adjusting clipping downward for wind farm inertia response; c d,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted downwards in a short time.
Optionally, the inertia response power distribution coefficient of the grid-connected wind turbine generator in the wind power plant comprises an upward inertia response power distribution coefficient a of the grid-connected wind turbine generator in the wind power plant u,i And assigning coefficient a downward d,i Wherein the calculation formula is as follows:
optionally, the rated capacity sum S of the control objects is combined with the inertia response difference adjustment coefficient of the wind power plant according to the inertia response difference adjustment coefficient of the wind power plant w Obtaining inertia response power P of wind power plant VIC_farm The expression of (2) is as follows:
wherein f L ＝50-f d ，f H ＝50+f d ；f d Responding to dead zones for inertia of the wind farm; f (f) N Rated frequency for the system; delta% is the wind farm inertia response slip coefficient. When the power grid is in power shortage, the inertia response power of the wind power plant cannot exceed the upward regulation limit, namely P VIC_farm ≤P up_LI 。
Optionally, the inertia response power expression of the grid-connected wind turbine generator set i in the wind power plant is as follows:
P VIC,i ＝P VIC_farm ×S w ×a u,i
wherein P is VIC,i And the inertia response power of the grid-connected wind turbine generator set i in the wind power plant is obtained.
The application provides a wind power station inertia response power distribution method considering rotation speed constraint, which comprises the following steps: when the active power is deficient, determining a grid-connected wind turbine generator set with inertia response capability in the wind power plant; calculating the sum of rated capacities of the inertia response control objects of the wind farm according to the grid-connected wind turbine generator; determining short-time adjustable capacity, short-time adjustable capacity and inertia response power upward regulation limiting and downward regulation limiting of the inertia response power distribution coefficients of the grid-connected wind turbine generator in the wind power plant according to the rotation speed constraint and the converter capacity limiting conditions; and obtaining inertia response power of the wind power plant and inertia response power of the grid-connected wind turbines in the wind power plant according to the inertia response difference adjustment coefficient of the wind power plant and the sum of rated capacities of inertia response control objects of the wind power plant, transmitting the inertia response power instruction to each grid-connected wind turbine, and increasing the power of the grid-connected wind turbines to realize power support.
The wind power station inertia response power distribution method considering the rotation speed constraint has the beneficial effects that: when the wind power plant provides inertia response, the frequency modulation capability of the wind power plant and the frequency modulation capability of each grid-connected wind turbine generator in the wind power plant are correctly evaluated, and the problem of frequency secondary drop caused by fan rotation speed protection action due to unreasonable power distribution is avoided.
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In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a wind farm inertia response power distribution method considering rotation speed constraint according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of systems and methods consistent with aspects of the application as set forth in the claims.
Referring to fig. 1, a schematic diagram of a wind farm inertia response power distribution method considering rotation speed constraint is provided in an embodiment of the present application.
The embodiment of the application provides a wind power station inertia response power distribution method considering rotation speed constraint, which comprises the following steps:
s1: determining the sum of rated capacities of wind farm inertia response control objects;
judging whether an active power deficiency occurs in a power grid, and determining a grid-connected wind turbine generator i with inertia response capability in a wind power plant when the active power deficiency occurs;
whether the grid-connected wind turbine generator system i with inertia response capability in the wind power plant has inertia response capability or not can be judged by the following formula:
wherein v is i The wind speed (m/s) of the grid-connected wind turbine generator system i in the wind power plant is represented; v 1,i The method comprises the steps that a corresponding lower wind speed limit (m/s) is provided when an inertial response capability is provided for a grid-connected wind turbine generator set i in a wind power plant; v n,i The wind speed is the rated wind speed (m/s) of the grid-connected wind turbine generator system i in the wind power plant, and the wind speed corresponds to the upper limit (m/s) of the wind speed when the grid-connected wind turbine generator system i in the wind power plant has inertial response capability.
v n,i Can be directly obtained from the parameter table of the wind turbine generator, v 1,i To be calculated according to the lowest output constraint which should provide inertia responseThe specific expression is as follows:
wherein P is wn,i The minimum output constraint corresponding to the inertial response is provided for the grid-connected wind turbine generator set i in the wind power plant, and is generally 0.26p.u.; c (C) Pmax,i The maximum wind energy utilization coefficient of the grid-connected wind turbine generator system i in the wind power plant is set; ρ is the air density (kg/m) 3 )；r i The radius (m/s) of the wind turbine blade of the grid-connected wind turbine generator set i in the wind power plant is the radius (m/s) of the wind turbine blade of the grid-connected wind turbine generator set i.
Calculating rated capacity sum S of wind power plant inertia response control objects according to the grid-connected wind turbine generator system i w ，S w Calculated according to the following formula:
n represents the number of grid-connected wind turbines in the wind power plant; k (k) f,i =1 indicates that the grid-connected wind turbine generator system i in the wind farm has inertial response capability, k f,i =0 indicates that the grid-connected wind turbine generator system i in the wind farm does not have inertial response capability; p (P) wn,i The rated active power (MW) of the grid-connected wind turbine generator system i in the wind power plant is shown.
S2: determining inertia response power limiting of a wind power plant and inertia response power distribution coefficients of grid-connected wind turbines in the wind power plant;
determining short-time adjustable capacity c of grid-connected wind turbine generator set i in wind power plant according to rotation speed constraint and converter capacity constraint conditions u,i And a short-time, down-adjustable capacity c d,i ；
Machine set capable of adjusting capacity c upwards in short time by considering minimum rotation speed constraint of wind power plant grid-connected wind turbine generator system i and capacity limitation of converter u,i The expression is as follows:
wherein P is w,i And P MPPT,i Respectively tracking expressions of mechanical power and maximum power of a grid-connected wind turbine generator i of the wind power plant; omega min,i Minimum rotation speed constraint (rad/s) of a grid-connected wind turbine generator system i for a wind farm; omega 2,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 2,i A corresponding rotational speed; when wind power plant grid-connected wind turbine generator system i wind speed v i Less than v 2,i When the unit can adjust the capacity upwards in a short time under the constraint omega of the minimum rotation speed min,i Limiting; when wind power plant grid-connected wind turbine generator system i wind speed v i Greater than v 2,i When the unit can adjust the upper limit P of the capacity-receiving converter upwards in a short time wn,i And (5) limiting.
P w,i The expression is as follows:
wherein C is P (gamma, beta) represents the wind energy utilization coefficient, beta is the pitch angle, and gamma represents the tip speed ratio.
The tip speed ratio is the ratio of the tip peripheral speed to the wind speed of the blade, and the mathematical expression is:
wherein omega w,i And (5) the rotating speed (rad/s) of the wind turbine of the grid-connected wind turbine generator system i of the wind power plant.
C P One common functional form of the (gamma, beta) wind energy utilization coefficient is expressed as:
where the units of β are degrees in this formula. Alpha (gamma, beta) is given by:
P MPPT,i the expression is as follows:
wherein, gamma opt,i And the optimal tip speed ratio of the grid-connected wind turbine generator system i of the wind power plant is obtained.
V of wind power plant grid-connected wind turbine generator system i 2,i And omega 2,i The method can be obtained by the following formula:
the capacity c of the wind power plant grid-connected wind turbine generator set with i maximum rotation speed constraint and the minimum grid-connected power constraint can be adjusted downwards in short time d,i The expression is as follows:
wherein omega 3,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 3,i Corresponding rotational speed. When wind power plant grid-connected wind turbine generator system i wind speed v i Less than v 3,i When the unit can downwards regulate the capacity in a short time under the constraint of the lowest grid-connected power P min,i Limiting; when wind power plant grid-connected wind turbine generator system i wind speed v i Greater than v 3,i When the machine set can adjust the capacity upwards for a short time under the constraint omega of the maximum rotation speed max,i And (5) limiting. V of wind power plant grid-connected wind turbine generator system i 3,i And omega 3,i And v 2,i And omega 2,i The evaluation is similar and will not be described in detail here.
According to the capacity c adjustable upwards for a short time u,i And a short-time, down-adjustable capacity c d,i The inertia response power of the wind power plant is adjusted upwards to limit, the inertia response power of the wind power plant is adjusted downwards to limit, and the inertia response power distribution coefficient of the grid-connected wind turbine generator in the wind power plant is obtained;
wherein P is up_LI Adjusting clipping upwardly for wind farm inertia response; c u,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted upwards in a short time; p (P) down_LI Adjusting clipping downward for wind farm inertia response; c d,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted downwards in a short time.
The inertia response power distribution coefficient of the grid-connected wind turbine generator in the wind power plant comprises an upward inertia response power distribution coefficient a of the grid-connected wind turbine generator in the wind power plant u,i And assigning coefficient a downward d,i Wherein the calculation formula is as follows:
s3: determining inertia response power of the wind power plant and inertia response power of the grid-connected wind turbine generator in the wind power plant according to the inertia response difference adjustment coefficient of the wind power plant;
according to the inertia response difference adjustment coefficient of the wind power plant and the sum S of rated capacities of wind power plant inertia response control objects w Obtaining inertia response power P of wind power plant VIC_farm ；
According to the inertia response difference adjustment coefficient of the wind power plant and the sum S of rated capacities of wind power plant inertia response control objects w Obtaining inertia response power P of wind power plant VIC_farm The expression of (2) is as follows:
wherein f L ＝50-f d ，f H ＝50+f d ；f d Responding to dead zones for inertia of the wind farm; f (f) N Rated frequency for the system; delta% is the wind farm inertia response slip coefficient. When the power grid is in power shortage, the inertia response power of the wind power plant cannot exceed the upward regulation limitWebs, i.e. P VIC_farm ≤P up_LI 。
According to the rated capacity sum S w The inertia response power P VIC_farm The inertia response power P of the grid-connected wind turbine generator set i in the wind power plant is obtained through the power distribution coefficient VIC,i And issues inertia response power instructions;
the inertia response power expression of the grid-connected wind turbine generator system i in the wind power plant is as follows:
P VIC,i ＝P VIC_farm ×S w ×a u,i
wherein P is VIC,i And the inertia response power of the grid-connected wind turbine generator set i in the wind power plant is obtained.
Transmitting the inertia response power instruction to each grid-connected wind turbine generator to increase the power P of the grid-connected wind turbine generator VIC,i And performing power support.
The application provides a wind power station inertia response power distribution method considering rotation speed constraint, which comprises the following steps: when the active power is deficient, determining a grid-connected wind turbine generator set with inertia response capability in the wind power plant; calculating the sum of rated capacities of the inertia response control objects of the wind farm according to the grid-connected wind turbine generator; determining short-time adjustable capacity, short-time adjustable capacity and inertia response power upward regulation limiting and downward regulation limiting of the inertia response power distribution coefficients of the grid-connected wind turbine generator in the wind power plant according to the rotation speed constraint and the converter capacity limiting conditions; and obtaining inertia response power of the wind power plant and inertia response power of the grid-connected wind turbines in the wind power plant according to the inertia response difference adjustment coefficient of the wind power plant and the sum of rated capacities of inertia response control objects of the wind power plant, transmitting the inertia response power instruction to each grid-connected wind turbine, and increasing the power of the grid-connected wind turbines to realize power support.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.
Claims (9)
1. The method for distributing the inertia response power in the wind power plant by considering the rotation speed constraint is characterized by comprising the following steps of:
judging whether an active power deficiency occurs in a power grid, and determining a grid-connected wind turbine generator i with inertia response capability in a wind power plant when the active power deficiency occurs;
calculating rated capacity sum S of wind power plant inertia response control objects according to the grid-connected wind turbine generator system i w ；
Determining short-time adjustable capacity c of grid-connected wind turbine generator set i in wind power plant according to rotation speed constraint and converter capacity constraint conditions u,i And a short-time, down-adjustable capacity c d,i ；
According to the capacity c adjustable upwards for a short time u,i And a short-time, down-adjustable capacity c d,i The inertia response power of the wind power plant is adjusted upwards to limit, the inertia response power of the wind power plant is adjusted downwards to limit, and the inertia response power distribution coefficient of the grid-connected wind turbine generator in the wind power plant is obtained;
combining wind power plant inertia response difference adjustment coefficient with wind power plant inertia response control object rated capacity sum S w Obtaining inertia response power P of wind power plant VIC_farm ；
According to the rated capacity sum S w The inertia response power P VIC_farm The inertia response power P of the grid-connected wind turbine generator set i in the wind power plant is obtained through the power distribution coefficient VIC,i And issues inertia response power instructions;
transmitting the inertia response power instruction to each grid-connected wind turbine generator, and increasing the power P of the grid-connected wind turbine generator VIC,i And performing power support.
2. The method for distributing inertia response power in a wind farm with consideration of rotation speed constraint according to claim 1, wherein the method for distributing inertia response power in a wind farm is characterized in that whether the grid-connected wind turbine generator i with inertia response capability in the wind farm has inertia response capability is determined by the following formula:
wherein v is i The wind speed of the grid-connected wind turbine generator system i in the wind power plant is represented; v 1,i The wind speed lower limit is corresponding to the moment that the grid-connected wind turbine generator system i in the wind power plant has inertial response capability; v n,i The wind speed is the rated wind speed of the grid-connected wind turbine generator system i in the wind power plant, and the wind speed corresponds to the upper limit of the wind speed when the grid-connected wind turbine generator system i in the wind power plant has inertial response capability.
3. The method for distributing inertia response power in a wind farm taking into account rotational speed constraints according to claim 2, wherein v 1,i The calculation is carried out according to the following formula:
wherein P is w1,i Providing the minimum output constraint corresponding to inertial response for the grid-connected wind turbine generator set i in the wind power plant; c (C) Pmax,i The maximum wind energy utilization coefficient of the grid-connected wind turbine generator system i in the wind power plant is set; ρ is the air density; r is (r) i The radius of the wind turbine blade of the grid-connected wind turbine generator set i in the wind power plant is set.
4. The method for distributing inertia response power in a wind farm taking rotation speed constraint into consideration according to claim 3, wherein a rated capacity sum S of wind farm inertia response control objects is calculated according to the grid-connected wind turbine generator set i w Calculated from the following formula:
and n represents the number of grid-connected wind turbines in the wind power plant.
5. According to claim 4The method is characterized in that the short-time up-adjustable capacity c of the grid-connected wind turbine generator set i in the wind power plant is determined according to the rotation speed constraint and the converter capacity limiting condition u,i And a short-time, down-adjustable capacity c d,i The method comprises the following steps:
minimum rotation speed constraint of wind power plant grid-connected wind turbine generator system i and capacity-limited generator system of converter can adjust capacity c upwards in short time u,i The expression is as follows:
wherein P is w,i And P MPPT,i Respectively tracking expressions of mechanical power and maximum power of a grid-connected wind turbine generator i of the wind power plant; omega min,i The lowest rotation speed constraint of the grid-connected wind turbine generator system i of the wind power plant is adopted; omega 2,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 2,i A corresponding rotational speed;
the capacity c of the wind power plant grid-connected wind turbine generator set with i maximum rotation speed constraint and the minimum grid-connected power constraint can be adjusted downwards in short time d,i The expression is as follows:
wherein omega 3,i Wind speed v under MPPT control for grid-connected wind turbine generator system i of wind power plant 3,i Corresponding rotational speed.
6. The method for distributing inertia response power in a wind farm in consideration of rotational speed constraints according to claim 5, wherein the inertia response power of the wind farm is adjusted upward to limit and the inertia response power of the wind farm is adjusted downward to limit is calculated according to the following equation:
wherein P is up_LI Adjusting clipping upwardly for wind farm inertia response; c u,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted upwards in a short time; p (P) down_LI Adjusting clipping downward for wind farm inertia response; c d,i The capacity of the grid-connected wind turbine generator system i of the wind power plant can be adjusted downwards in a short time.
7. The method for distributing inertia response power in a wind farm in consideration of rotation speed constraint according to claim 6, wherein the inertia response power distribution coefficient of the grid-connected wind turbine in the wind farm comprises an upward inertia response power distribution coefficient a of the grid-connected wind turbine in the wind farm u,i And assigning coefficient a downward d,i Wherein the calculation formula is as follows:
8. the method for distributing inertia response power in a wind farm in consideration of rotation speed constraint according to claim 7, wherein the wind farm inertia response difference adjustment coefficient is combined with the sum of rated capacities of wind farm inertia response control objects S w Obtaining inertia response power P of wind power plant VIC_farm The expression of (2) is as follows:
wherein f L ＝50-f d ，f H ＝50+f d ；f d Responding to dead zones for inertia of the wind farm; f (f) N Rated frequency for the system; delta% is the inertia response difference adjustment coefficient of the wind farm; when the power grid is in power shortage, the inertia response power of the wind power plant does not exceed the upward regulation amplitude limit, namely P VIC_farm ≤P up_LI 。
9. The method for distributing inertia response power in a wind farm in consideration of rotation speed constraint according to claim 8, wherein the inertia response power expression of the grid-connected wind turbine generator set i in the wind farm is as follows:
P VIC,i ＝P VIC_farm ×S w ×a u,i
wherein P is VIC,i And the inertia response power of the grid-connected wind turbine generator set i in the wind power plant is obtained.
Priority Applications (1)
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