CN110867850A - Method for calculating rotating speed of generator and parameters of wind turbine generator and wind turbine generator model - Google Patents
Method for calculating rotating speed of generator and parameters of wind turbine generator and wind turbine generator model Download PDFInfo
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Abstract
The invention provides a method for calculating the rotating speed of a generator and parameters of a wind turbine generator and a wind turbine generator model, wherein the method for calculating the rotating speed of the generator is applied to establishing the wind turbine generator model and comprises the following steps: acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; and calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters. By implementing the method, the rotating speed of the generator under the maximum power point tracking control can be directly calculated according to the wind speed of the wind turbine and the parameters of the wind turbine, and when the grid connection problem of the wind turbine is researched, all sub-modules in a wind turbine model do not need to be modeled, so that the wind turbine model is simplified.
Description
Technical Field
The invention relates to the field of wind turbine generator modeling, in particular to a method for calculating the rotating speed of a generator and parameters of a wind turbine generator and a wind turbine generator model.
Background
The variable speed unit adopts the power converter to realize variable speed constant frequency operation, has outstanding advantages and is widely applied at present. The speed change unit comprises a full-power conversion unit and a double-fed unit, wherein a stator winding and a back-to-back converter of the double-fed unit are both connected to a power grid, a generator in the speed change unit is directly coupled with the power grid, and the rotating speed of the generator and the active power of the generator need to be considered when the influence of power grid disturbance on the unit is researched. In the prior art, in order to study the influence of power grid disturbance on a wind turbine, a complete wind turbine model is usually established, and models of each part in the wind turbine are respectively established, wherein the models comprise sub modules of wind speed, wind turbine aerodynamics, a transmission system, a variable pitch execution mechanism, a generator, a back-to-back converter and control thereof, a main control system (including maximum power tracking control and variable pitch control), power grid equivalence and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that a wind turbine generator model in the prior art is complex, so that a method for calculating the rotating speed of a generator and the parameters of the wind turbine generator and the wind turbine generator model are provided.
The invention provides a method for calculating the rotating speed of a generator, which is applied to building a wind turbine set model and comprises the following steps: acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; and calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters.
Optionally, the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator.
The second aspect of the invention provides a wind turbine generator parameter calculation method, which comprises the following steps: acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the parameters of the wind turbine; calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator; according to the rotating speed of the generator and the active power of the generator, calculating an active power reference value of a side converter; and calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value.
Optionally, the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator.
Optionally, the step of calculating the active power of the generator under the maximum power point tracking control of the generator at the rotation speed of the generator includes: acquiring air density, the radius of a blade of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine; and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density, the radius of the blades of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine.
Optionally, the generator active power is calculated by the following formula:
wherein k isa＝0.5ρπR2ρ represents the air density, R represents the blade radius of the wind turbine, Cp0Representing a maximum wind energy utilization factor, v, of said wind turbine0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia, λ, of said wind turbine and generator0Representing an optimal tip speed ratio for the wind turbine.
Optionally, the machine side converter is activeThe power reference values are:
wherein, S represents the slip ratio,
ω1represents the synchronous speed of the generator and ω represents the generator speed.
A third aspect of the present invention provides a wind turbine generator model, including: the first parameter acquisition module is used for acquiring the wind speed of a wind turbine set and the set parameters of the wind turbine set, wherein the set parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; the first generator rotating speed calculating module is used for calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters; the first generator active power calculation module is used for calculating the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator; the first back-to-back converter control module is used for calculating an active power reference value of a side converter according to the rotating speed of the generator and the active power of the generator; the first back-to-back converter module is used for calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value; the first generator module is used for calculating the equivalent injection power grid current of the generator according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator; and the first power grid module is used for calculating the generator terminal voltage and other electrical parameters in the power grid according to the equivalent injection power grid current of the generator and the power grid network connection.
The fourth aspect of the present invention provides a wind turbine generator parameter calculation method, including: acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters; calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator; according to the active power of the generator, calculating an active power reference value of a side converter; and calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value.
Optionally, the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing said average wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator.
Optionally, the step of calculating the active power of the generator under the maximum power point tracking control of the generator at the rotation speed of the generator includes: acquiring air density, the radius of a blade of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine; and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density, the radius of the blades of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine.
Optionally, the generator active power is calculated by the following formula:
wherein k isa＝0.5ρπR2ρ represents the air density, R represents the blade radius of the wind turbine, Cp0Representing a maximum wind energy utilization factor, v, of said wind turbine0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia, λ, of said wind turbine and generator0Representing an optimal tip speed ratio for the wind turbine.
Optionally, the active power reference value of the machine-side converter is the same as the organic power of the generator.
A fifth aspect of the present invention provides a wind turbine generator model, including: the second parameter acquisition module is used for acquiring the wind speed of the wind turbine set and the set parameters of the wind turbine set, wherein the set parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine; the second generator rotating speed calculating module is used for calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters; the second generator active power calculation module is used for calculating the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator; the second back-to-back converter control module is used for calculating an active power reference value of the side converter according to the active power of the generator; the second back-to-back converter module is used for calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value; the second generator module is used for calculating the equivalent injection power grid current of the generator according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator; and the second power grid module is used for calculating the generator terminal voltage and other electrical parameters in the power grid according to the equivalent injection power grid current of the generator and the power grid network connection.
A sixth aspect of the present invention provides a computer apparatus comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to perform the method for calculating a generator speed as provided in the first aspect of the invention, or the method for calculating a wind turbine parameter as provided in the second aspect of the invention, or the method for calculating a wind turbine parameter as provided in the fourth aspect of the invention.
A seventh aspect of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for calculating a rotational speed of a generator according to the first aspect of the present invention, or the method for calculating a parameter of a wind turbine according to the second aspect of the present invention, or the method for calculating a parameter of a wind turbine according to the fourth aspect of the present invention.
The technical scheme of the invention has the following advantages:
1. according to the method for calculating the rotating speed of the generator, the rotating speed of the generator under the tracking control of the maximum power point can be directly calculated according to the wind speed of the wind turbine and the parameters of the wind turbine, when the grid connection problem of the wind turbine is researched, all sub-modules in a wind turbine model do not need to be modeled, and the wind turbine model is simplified.
2. According to the wind turbine parameter calculation method provided by the invention, parameters required by the research of the wind turbine during grid connection can be obtained through the calculation method, all sub-modules in a wind turbine model do not need to be modeled, and the wind turbine model is simplified.
3. According to the wind turbine generator parameter calculation method provided by the invention, the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator can be directly calculated through the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, the generator active power can be obtained without establishing a complex model when the grid connection problem of the wind turbine generator is researched, and the wind turbine generator model can be simplified through the calculation method.
4. According to the wind turbine generator model, the first generator rotating speed calculating module and the first generator active power calculating module can directly calculate the starting motor rotating speed and the generator active power according to the wind speed and the air density of the wind turbine generator and the wind turbine generator parameters, all sub-modules in the wind turbine generator model do not need to be modeled, and the wind turbine generator model is simplified.
5. According to the wind turbine generator parameter calculation method provided by the invention, the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator can be directly calculated through the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, the generator active power can be obtained without establishing a complex model when the grid connection problem of the wind turbine generator is researched, and the wind turbine generator model can be simplified through the calculation method.
6. According to the wind turbine generator model, the second generator rotating speed calculating module and the second generator active power calculating module provided by the invention, the starting motor rotating speed and the generator active power can be directly calculated according to the wind speed and the air density of the wind turbine generator and the wind turbine generator parameters, all sub-modules in the wind turbine generator model are not required to be modeled, and the wind turbine generator model is simplified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic block diagram of a wind turbine model in an embodiment of the invention;
FIG. 2 is a schematic block diagram of a specific example of a model of a wind turbine generator in an embodiment of the invention;
FIG. 3 is a step wind speed in a model simulation according to an embodiment of the present invention;
FIG. 4 is a comparison waveform of the rotation speeds of two sets of model generators in an embodiment of the present invention;
FIG. 5 is a comparison waveform of output power of two models according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a wind turbine generator parameter calculation flow in the embodiment of the present invention;
FIG. 7 is a schematic diagram of a flow of calculating parameters of a wind turbine generator according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a calculation process of the rotational speed of the generator according to an embodiment of the present invention;
FIG. 9 is a schematic block diagram of a wind turbine model in an embodiment of the present invention;
FIG. 10 is a schematic block diagram of a specific example of a model of a wind turbine generator in an embodiment of the invention;
FIG. 11 is a schematic view of a flow chart of calculating parameters of a wind turbine generator according to an embodiment of the present invention;
FIG. 12 is a schematic view of a flow chart of calculating parameters of a wind turbine generator according to an embodiment of the present invention;
FIG. 13 is a schematic block diagram of a computer apparatus in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
When a wind turbine model is established in power simulation software, the existing modeling method generally needs to respectively model each part of the wind turbine model, including wind speed, wind turbine aerodynamics, a transmission system, a variable pitch execution mechanism, a generator, a back-to-back converter and control thereof, a master control system (including maximum power tracking control and variable pitch control), a power grid equivalence submodule and the like. Considering that the wind power integration analysis does not need to pay attention to the state variables such as the aerodynamic power, the pitch angle and the like of the wind turbine, only a generator set model including the generator and the back-to-back converter is required to be reserved.
In a specific embodiment, the wind turbine model is a simplified model of a doubly-fed wind turbine, as shown in fig. 1 and fig. 2, and includes:
the first parameter obtaining module 11 is configured to obtain a wind speed at which the wind turbine is located and a turbine parameter of the wind turbine, where the turbine parameter includes a rotation speed of the wind turbine, a sum of rotational inertia of the wind turbine and a generator, and an optimal torque coefficient in optimal torque control of the wind turbine.
The first generator rotating speed calculating module 12 is configured to calculate a generator rotating speed under maximum power point tracking control according to the wind speed and the unit parameters:
wherein, ω is0Indicating wind turbine speed, v0Representing mean wind speed, v wind speed, koptRepresenting the optimal torque coefficient in optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator. In a specific embodiment, the rotating speed of the wind turbine, the optimal torque coefficient in the optimal torque control of the wind turbine, and the sum of the rotational inertia of the wind turbine and the generator are fixed values given by a generator manufacturer. In one embodiment, as shown in FIG. 2, there is an upper limit ω of the rated speed of the generator speednAnd a lower limit of 0.
The above generator speed calculation formula is obtained as follows:
representing a transmission system in a conventional modeling wind turbine generator model as J of rotational inertiasumThe single mass model of (a) is,
wherein, TaRepresenting aerodynamic torque, T, of a wind turbineeThe method is characterized in that the electromagnetic torque of a wind turbine is represented, omega represents the rotating speed of a generator, when a gear box exists between the wind turbine and the generator, the rotating inertia of the low-speed side or the high-speed side needs to be converted to the other side, and the conversion method is that
Wherein JWTRepresenting the actual moment of inertia, J, of the wind turbineGRepresenting the actual moment of inertia, n, of the generatorgbRepresenting the wind turbine to generator gearbox ratio, omegaBIndicating a selected generator reference speed, PBRepresenting the reference power.
Multiplying the two sides of the formula (2) by the rotating speed and linearizing to obtain
Jsumω0dΔω/dt＝ΔPa-ΔPe(3)
The aerodynamic power of the wind turbine with the nonlinear characteristic can be expressed as
Wherein C ispRepresenting the wind energy utilization factor, ρ representing the air density, v representing the wind speed, R representing the blade radius, λ representing the tip speed ratio, β representing the pitch angle.
λ＝ωR/v (5)
Considering β -0 below the rated wind speed, Cp may be expressed as a unary function Cp (λ) of λ, and linearizing equation (4) at the steady-state optimum operating point yields
Wherein L isv|OP0Represents PaPartial derivatives of v, Lω|OP0Represents PaThe partial derivative of ω. Considering megawatt wind generating set CpVery flat at the apex of the curve, dCpAnd/d lambda is approximately equal to 0. Thus, it is possible to provide
The following formula is generally adopted for tracking and controlling the maximum power point of the unit
Pe *＝koptω3(8)
Wherein k isoptRepresenting the optimal coefficients as determined by the wind turbine parameters. On an electromechanical time scale, the generator torque response can be considered to be sufficiently rapid, so that Pe＝Pe *Then, then
Combined with formulas (3), (7) having
For generator speed, it can be expressed as the sum of the steady-state component and the dynamic component
ω＝ω0+Δω (12)
Wherein
Expressing wind speed as the sum of its steady-state and fluctuating components
v＝v0+Δv (14)
Taking into account the steady-state component v to the wind speed0Low pass filtering is still performed as v0Therefore, it is found that the rotation speed of the generator is as shown in equation (1):
as can be seen from the formula (1), when the first generator rotation speed calculation module 12 provided by the embodiment of the present invention calculates the generator rotation speed, the required parameters are less, a complex model is not required to be established as in the prior art, the generator rotation speed under the maximum power point tracking control can be directly calculated according to the wind speed of the wind turbine and the parameters of the wind turbine, and when the wind turbine grid connection problem is researched, all sub-modules in the wind turbine model are not required to be modeled, thereby simplifying the wind turbine model.
And the first generator active power calculation module 13 is configured to calculate the generator active power under the maximum power point tracking control of the generator at the generator rotation speed.
First back-to-back ac converter control module 14 is used for calculating the active power reference value of the machine side converter according to the rotating speed of the generator and the active power of the generator, the machine side converter rectifies the three-phase ac output by the motor stator into dc, so as to realize the stable dc voltage output of the generator under different wind speeds and rotating speeds, and for the machine side converter of the double-fed machine set, the machine side active power reference value is:
wherein, S represents the slip ratio,
ω1indicating the synchronous speed of the generator.
The first back-to-back converter module 15 is configured to calculate a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value, in a specific embodiment, the reactive power reference value of the back-to-back converter may be obtained according to the active power reference value and the power factor, or may be controlled by a voltage-reactive closed loop, where the reactive power reference value is an actual current sent by the wind turbine generator to the grid module. When modeling the back-to-back converter module 15, a conventional modeling method including a controlled current source model, a controlled voltage source model, a switch average value model, a switch model, etc. may be adopted, and the existing mature technology may be adopted for power loop control and current loop control of the back-to-back converter.
And the first generator module 16 is used for calculating the equivalent injection power grid current of the generator according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator.
And the first power grid module 17 is used for calculating the generator terminal voltage and other electrical parameters in the power grid according to the equivalent injected power grid current of the generator and the power grid network connection.
The method for establishing the first generator module 16 and the first grid module 17 is consistent with the prior art, and therefore, no further description is given in this embodiment.
The wind turbine generator model provided by the embodiment is only provided with the first parameter obtaining module 11, the first generator rotating speed calculating module 12, the first generator active power calculating module 13, the first back-to-back converter control module 14 and the first back-to-back converter module 15, the wind turbine generator grid connection problem is researched through the necessary modules, the number of the modules is small, and the model is simple. In the existing modeling technology, besides a back-to-back converter control module and a back-to-back converter module, a wind turbine, a transmission system, a variable pitch system and a maximum power tracking control system need to be modeled respectively, wherein a Cp model adopted by the wind turbine model needs to identify 8 parameters; the transmission system model requires the known rigidity and damping of the transmission shaft besides the rotational inertia of each part; the variable pitch system model comprises a variable pitch actuating mechanism and a variable pitch control system; the maximum power tracking control system realizes the maximum power tracking of the wind turbine. The parts enable the number of the whole wind turbine generator model modules to be large and the model to be complex in the conventional modeling method.
In an optional embodiment, the first parameter obtaining module 11 is further configured to obtain an air density of the wind turbine, a blade radius of the wind turbine, a maximum wind energy utilization coefficient of the wind turbine, and an optimal tip speed ratio of the wind turbine, and the first generator active power calculating module 13 calculates the generator active power according to the following formula:
wherein k isa＝0.5ρπR2ρ represents the air density at which the wind turbine is located, R represents the blade radius of the wind turbine, Cp0Representing the maximum wind energy utilization factor, λ, of the wind turbine0Indicating the optimum tip speed ratio for the wind turbine. In one embodiment, the active power of the generator has an upper power rating limit PnAnd a lower limit of 0.
The active power calculation formula of the generator is obtained by the following method:
for generator electrical power on an electromechanical time scale, it can be expressed as the sum of the steady-state and dynamic components:
Pe＝Pe0+ΔPe(16)
wherein
According to v ═ v0+ Δ v, has
Where hots are negligibly high-order terms. Taking into account the steady-state component v to the wind speed0Low pass filtering is still performed as v0Therefore, the active power of the generator is obtained as shown in formula (15):
as can be seen from the formula (15), the generator active power calculation module 13 provided by the embodiment of the present invention calculates the generator active power, and has fewer required parameters, thereby simplifying the wind turbine generator model.
In a specific embodiment, in order to show that the effectiveness of the wind turbine model provided in this embodiment is not reduced after the wind turbine model is simplified, the wind turbine model provided in this embodiment is compared with the wind turbine model in the prior art through a simulation experiment. In the wind turbine generator model provided in this embodiment, the first back-to-back converter control module 14 and the first back-to-back converter module 15 are constructed in the same manner as in the prior art, but the difference is that in the wind turbine generator model provided in this embodiment, the rotation speed of the generator is obtained through the first generator rotation speed calculation module 12, the active power of the generator is obtained through the first generator active power calculation module 13, and in the prior art, the rotation speed of the generator and the active power of the generator obtained by two different models are compared by establishing models such as a wind turbine, a transmission system, a pitch control system, a maximum power tracking control system and the like.
In an EMTDC/PSCAD simulation environment, a simplified model shown in FIG. 2 is established for a 2MW permanent magnet direct-drive full-power conversion unit, meanwhile, a detailed model of the same unit is established according to a conventional modeling method, and back-to-back converter modules and back-to-back converter control modules of the two models are completely consistent. The difference lies in that the detailed model of the set respectively models each submodule, including a wind turbine model adopting 8 Cp parameters, a two-mass block transmission system model considering the rigidity and the damping of a transmission shaft, a variable pitch system model including a variable pitch executing mechanism and a variable pitch control system, and a maximum power tracking control system adopting the optimal torque control to realize the maximum power tracking of the wind turbine; and the simplified model adopts the formula (1) and the formula (15) to directly obtain the rotating speed and the output electric power of the generator. The same step wind speed was used for both models, as shown in FIG. 3. Fig. 4 shows a comparison waveform of the rotating speeds of the two models of generators, the rotating speeds are per unit (the reference rotating speed is 1.5rad/s), it can be seen that the coincidence degree of the two is very high, and the steady-state and dynamic responses of the rotating speeds of the generators are basically consistent. Fig. 5 shows comparison waveforms of output electric power of the two models, and it can be seen that the simulation results of the simplified model and the detailed model have high goodness of fit, and the steady-state and dynamic characteristics of the active power are basically consistent.
As can be seen from the simulation results, the wind turbine model provided by the embodiment is simplified in structure, but the effectiveness of the wind turbine model is substantially the same as that of the wind turbine model in the prior art.
Example 2
The embodiment provides a wind turbine generator parameter calculation method, and in a specific embodiment, the method is suitable for calculating parameters of a doubly-fed wind turbine generator, as shown in fig. 6, and includes:
step S110: the method comprises the steps of obtaining the wind speed of a wind turbine and the unit parameters of the wind turbine, wherein the unit parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine, and the detailed description is described in the first parameter obtaining module 11 in the embodiment 1;
step S120: the generator speed under the maximum power point tracking control is calculated according to the wind speed and the unit parameters, and the detailed description is given in the above embodiment 1 for the first generator speed calculation module 12;
step S130: the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator is calculated, and the detailed description is given in the description of the first generator active power calculation module 13 in the above embodiment 1;
step S140: the detailed description is given in the above embodiment 1 for the first back-to-back converter control module 14 according to the generator speed and the generator active power computer-side converter active power reference value;
step S150: the back-to-back converter grid-side reactive power reference value is calculated according to the machine-side active power reference value, and the detailed description is given in the above embodiment 1 for the first back-to-back converter module 15.
In an alternative embodiment, the generator speed is calculated by the following equation:
for a detailed description, the first generator speed calculation module 12 is described in embodiment 1 above.
In an alternative embodiment, as shown in fig. 7, step S130 specifically includes:
step S131: acquiring the air density of a wind turbine unit, the blade radius of a wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine;
step S132: and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density of the wind turbine, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine, the optimal blade tip speed ratio of the wind turbine and the optimal torque coefficient in the optimal torque control of the wind turbine.
In an alternative embodiment of the method of the invention,calculating the generator active power by the following formula:
for a detailed description, see the description of the first generator active power calculation module 13 in embodiment 1 above.
In an alternative embodiment, the active power reference value of the machine side converter is:
wherein, S represents the slip ratio,
ω1represents the synchronous speed of the generator and ω represents the generator speed. For a detailed description, the first back-to-back converter control module 14 is described in embodiment 1.
In a specific embodiment, when the influence of the grid disturbance on the wind turbine generator is studied, the equivalent injection grid current of the generator, the generator terminal voltage and other electrical parameters in the grid are also considered, in this embodiment, the equivalent injection grid current of the generator is calculated according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator, and the generator terminal voltage and other electrical parameters in the grid are calculated according to the equivalent injection grid current of the generator and the grid network connection.
According to the wind turbine generator parameter calculation method provided by the embodiment of the invention, the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator can be directly calculated through the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, the generator active power can be obtained without establishing a complex model when the grid connection problem of the wind turbine generator is researched, and the wind turbine generator model can be simplified through the calculation method.
Example 3
The embodiment provides a method for calculating the rotating speed of a generator, which is applied to building a wind turbine set model, and as shown in fig. 8, the method comprises the following steps:
step S110, acquiring the wind speed of the wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine, and the detailed description is described in the first parameter acquisition module 11 in the embodiment 1;
and step S120, calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters, wherein the detailed description is provided in the embodiment 1 for the first rotating speed calculation module 12.
According to the method for calculating the rotating speed of the generator, the rotating speed of the generator under the maximum power point tracking control can be directly calculated according to the wind speed of the wind turbine and the parameters of the wind turbine, when the grid connection problem of the wind turbine is researched, all sub-modules in a wind turbine model do not need to be modeled, and the wind turbine model is simplified.
Alternatively, the generator speed is calculated by the following formula:
for a detailed description, the first generator speed calculation module 12 is described in embodiment 1 above.
Example 4
In a specific embodiment, the wind turbine model is a simplified model of a full-power conversion wind turbine, as shown in fig. 9 and 10, and includes:
the second parameter obtaining module 21 is configured to obtain a wind speed at which the wind turbine is located and a turbine parameter of the wind turbine, where the turbine parameter includes a rotation speed of the wind turbine, a sum of rotational inertia of the wind turbine and a generator, and an optimal torque coefficient in optimal torque control of the wind turbine, and the detailed description is described in the first parameter obtaining module 11 in embodiment 1;
a second generator speed calculation module 22, configured to calculate a generator speed under maximum power point tracking control according to the wind speed and the unit parameters, as described in detail in the above embodiment 1 for the first generator speed calculation module 12;
a second generator active power calculation module 23, configured to calculate an active power of the generator under maximum power point tracking control of the generator at a rotating speed of the generator, for detailed description, see the description of the first generator active power calculation module 13 in embodiment 1 above;
the second back-to-back converter control module 24 is configured to calculate an active power reference value of the side converter according to the active power of the generator, and for the full-power conversion wind turbine generator, the active power reference value of the side converter is equal to the active power of the generator;
a second back-to-back converter module 25, which calculates a back-to-back converter reactive power reference value according to the machine side capacity and the machine side active power reference value, and the detailed description is described in the above embodiment 1 with respect to the first back-to-back converter module 15;
a second generator module 26, configured to calculate a generator equivalent injection grid current according to the back-to-back converter reactive power reference value and the generator rotation speed, for a detailed description, see the description of the first generator module 16 in embodiment 1 above;
the second grid module 27 is used for calculating the generator terminal voltage and other electrical parameters in the grid according to the generator equivalent injection grid current and the grid network connection, and the detailed description is given in the above embodiment 1 for the first grid module 17.
According to the wind turbine generator model provided by the embodiment of the invention, the rotating speed calculation module of the second generator and the active power calculation module of the second generator can directly calculate the rotating speed of the starting motor and the active power of the generator according to the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, all sub-modules in the wind turbine generator model do not need to be modeled, and the modeling is simpler compared with the existing modeling technology.
Example 5
The present embodiment provides a method for calculating parameters of a wind turbine, and in a specific embodiment, the method is applicable to calculating parameters of a full-power wind turbine, as shown in fig. 11, and includes:
step S210: the method comprises the steps of obtaining the wind speed of a wind turbine and the unit parameters of the wind turbine, wherein the unit parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine, and the detailed description is described in the first parameter obtaining module 11 in the embodiment 1;
step S220: the generator speed under the maximum power point tracking control is calculated according to the wind speed and the unit parameters, and the detailed description is given in the above embodiment 1 for the first generator speed calculation module 12;
step S230: the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator is calculated, and the detailed description is given in the description of the first generator active power calculation module 13 in the above embodiment 1;
step S240: the detailed description is given in the above embodiment 3 for the second back-to-back converter control module 24 according to the active power reference value of the generator active power computer-side converter;
step S250: the back-to-back converter reactive power reference value is calculated according to the machine-side active power reference value, and the detailed description is given in the above embodiment 1 for the first back-to-back converter module 15.
According to the wind turbine generator parameter calculation method provided by the embodiment, the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator can be directly calculated through the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, the generator active power can be obtained without establishing a complex model when the grid connection problem of the wind turbine generator is researched, the wind turbine generator model can be simplified through the calculation method, and the calculated wind turbine generator parameters of the wind turbine generator are basically consistent with the wind turbine generator parameters obtained through the existing modeling technology.
In an alternative embodiment, the generator speed is calculated by the following equation:
for a detailed description, the first generator speed calculation module 12 is described in embodiment 1 above.
In an alternative embodiment, as shown in fig. 12, step S230 specifically includes:
step S231: acquiring the air density of a wind turbine unit, the blade radius of a wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine;
step S232: and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density and the air speed of the wind turbine, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine, the optimal blade tip speed ratio of the wind turbine and the optimal torque coefficient in the optimal torque control of the wind turbine.
In an alternative embodiment, the generator active power is calculated by the following formula:
for a detailed description, see the description of the first generator active power calculation module 13 in embodiment 1 above.
In an alternative embodiment, for a full-power conversion wind turbine, the active power reference value of the generator-side converter is the same as the organic power of the generator.
In a specific embodiment, when the influence of the grid disturbance on the wind turbine generator is studied, the equivalent injection grid current of the generator, the generator terminal voltage and other electrical parameters in the grid are also considered, in this embodiment, the equivalent injection grid current of the generator is calculated according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator, and the generator terminal voltage and other electrical parameters in the grid are calculated according to the equivalent injection grid current of the generator and the grid network connection.
According to the wind turbine generator parameter calculation method provided by the embodiment of the invention, the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator can be directly calculated through the wind speed and the air density of the wind turbine generator and the parameters of the wind turbine generator, the generator active power can be obtained without establishing a complex model when the grid connection problem of the wind turbine generator is researched, and the wind turbine generator model can be simplified through the calculation method.
Example 6
The present embodiment provides a computer device, as shown in fig. 13, the computer device mainly includes one or more processors 51 and a memory 52, and one processor 51 is taken as an example in fig. 13.
The computer device may further include: an input device 55 and an output device 54.
The processor 51, the memory 52, the input device 55 and the output device 54 may be connected by a bus or other means, and the bus connection is exemplified in fig. 13.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of the wind turbine generator model, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 optionally includes memory located remotely from the processor 51, and these remote memories may be connected to the wind turbine model over a network. The input device 55 may receive a calculation request (or other numerical or character information) input by a user and generate a key signal input related to the wind turbine model. The output device 54 may include a display device such as a display screen for outputting the calculation result.
Example 7
The present embodiment provides a computer-readable storage medium storing computer instructions, and the computer-readable storage medium storing computer-executable instructions, the computer-executable instructions being capable of executing the generator speed calculation method and the wind power plant parameter calculation method in any of the above method embodiments. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (16)
1. A generator rotating speed calculation method is applied to building a wind turbine set model and is characterized by comprising the following steps:
acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine;
and calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters.
2. The generator speed calculation method according to claim 1, characterized in that the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresents the aboveThe sum of the rotational inertia of the wind turbine and the generator.
3. A wind turbine generator parameter calculation method is characterized by comprising the following steps:
acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine;
calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters;
calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator;
according to the rotating speed of the generator and the active power of the generator, calculating an active power reference value of a side converter;
and calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value.
4. The wind turbine generator parameter calculation method according to claim 3, wherein the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator.
5. The wind turbine generator parameter calculation method according to claim 3, wherein the step of calculating the active power of the generator under the maximum power point tracking control of the generator at the generator speed comprises:
acquiring the air density of a wind turbine set, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine;
and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density of the wind turbine, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine, the optimal blade tip speed ratio of the wind turbine and the optimal torque coefficient in the optimal torque control of the wind turbine.
6. The wind turbine generator parameter calculation method according to claim 5, wherein the generator active power is calculated by the following formula:
wherein k isa＝0.5ρπR2ρ represents the density of the air in which the wind turbine is located, R represents the blade radius of the wind turbine, Cp0Representing a maximum wind energy utilization factor, v, of said wind turbine0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia, λ, of said wind turbine and generator0Representing an optimal tip speed ratio for the wind turbine.
7. The wind turbine generator parameter calculation method according to claim 3,
the active power reference value of the machine side converter is as follows:
wherein, S represents the slip ratio,
ω1represents the synchronous speed of the generator and ω represents the generator speed.
8. A wind turbine model, comprising:
the first parameter acquisition module is used for acquiring the wind speed of a wind turbine set and the set parameters of the wind turbine set, wherein the set parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine;
the first generator rotating speed calculating module is used for calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters;
the first generator active power calculation module is used for calculating the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator;
the first back-to-back converter control module is used for calculating an active power reference value of a side converter according to the rotating speed of the generator and the active power of the generator;
the first back-to-back converter module is used for calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value;
the first generator module is used for calculating the equivalent injection power grid current of the generator according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator;
and the first power grid module is used for calculating the generator terminal voltage and other electrical parameters in the power grid according to the equivalent injection power grid current of the generator and the power grid network connection.
9. A wind turbine generator parameter calculation method is characterized by comprising the following steps:
acquiring the wind speed of a wind turbine and the turbine parameters of the wind turbine, wherein the turbine parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine;
calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters;
calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator;
according to the active power of the generator, calculating an active power reference value of a side converter;
and calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value.
10. The wind turbine generator parameter calculation method according to claim 9, wherein the generator speed is calculated by the following formula:
wherein, ω is0Representing the wind turbine speed, v0Representing said average wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia of the wind turbine and the generator.
11. The wind turbine generator parameter calculation method according to claim 9, wherein the step of calculating the active power of the generator under the maximum power point tracking control of the generator at the generator speed comprises:
acquiring the air density of a wind turbine set, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine and the optimal tip speed ratio of the wind turbine;
and calculating the active power of the generator under the maximum power point tracking control of the generator at the rotating speed of the generator according to the air density and the air speed of the wind turbine, the blade radius of the wind turbine, the maximum wind energy utilization coefficient of the wind turbine, the optimal blade tip speed ratio of the wind turbine and the optimal torque coefficient in the optimal torque control of the wind turbine.
12. The wind turbine generator parameter calculation method according to claim 11, wherein the generator active power is calculated by the following formula:
wherein k isa＝0.5ρπR2ρ represents the air density, R represents the blade radius of the wind turbine, Cp0Representing a maximum wind energy utilization factor, v, of said wind turbine0Representing the mean wind speed, v representing said wind speed, koptRepresenting an optimal torque coefficient in the optimal torque control of the wind turbine, JsumRepresenting the sum of the moments of inertia, λ, of said wind turbine and generator0Representing an optimal tip speed ratio for the wind turbine.
13. The wind turbine generator parameter calculation method according to claim 9,
and the active power reference value of the machine side converter is the same as the organic power of the generator.
14. A wind turbine model, comprising:
the second parameter acquisition module is used for acquiring the wind speed of the wind turbine set and the set parameters of the wind turbine set, wherein the set parameters comprise the rotating speed of a wind turbine, the sum of the rotating inertia of the wind turbine and a generator and the optimal torque coefficient in the optimal torque control of the wind turbine;
the second generator rotating speed calculating module is used for calculating the rotating speed of the generator under the maximum power point tracking control according to the wind speed and the unit parameters;
the second generator active power calculation module is used for calculating the generator active power under the maximum power point tracking control of the generator at the rotating speed of the generator;
the second back-to-back converter control module is used for calculating an active power reference value of the side converter according to the active power of the generator;
the second back-to-back converter module is used for calculating a reactive power reference value of the back-to-back converter according to the machine side capacity and the machine side active power reference value;
the second generator module is used for calculating the equivalent injection power grid current of the generator according to the reactive power reference value of the back-to-back converter and the rotating speed of the generator;
and the second power grid module is used for calculating the generator terminal voltage and other electrical parameters in the power grid according to the equivalent injection power grid current of the generator and the power grid network connection.
15. A computer device, comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to perform the generator speed calculation method of claim 1 or 2, or the wind turbine parameter calculation method of any of claims 3-7, or the wind turbine parameter calculation method of any of claims 9-13.
16. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions for causing the computer to execute the generator speed calculation method according to claim 1 or 2, or the wind turbine parameter calculation method according to any one of claims 3 to 7, or the wind turbine parameter calculation method according to any one of claims 9 to 13.
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