CN114282353A - Simplified electromagnetic transient simulation model, method, terminal and medium for doubly-fed wind turbine - Google Patents
Simplified electromagnetic transient simulation model, method, terminal and medium for doubly-fed wind turbine Download PDFInfo
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Abstract
The invention discloses a simplified electromagnetic transient simulation model, a simplified electromagnetic transient simulation method, a simplified electromagnetic transient simulation terminal and a simplified electromagnetic transient simulation medium for a doubly-fed wind turbine, wherein the model comprises the following components: the equivalent model is simplified by a reactive control unit, an active control unit and a fan interface; the reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model; the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model; the fan interface simplified equivalent model is used for receiving a fan equivalent internal potential and active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid. The electromagnetic transient simulation model can be suitable for large-step-size wind power generation system-level simulation analysis by simplifying the equivalent model through the fan interface, can accurately simulate the active/reactive characteristics of the fan unit at the alternating-current wiring port, and has the advantages of smaller calculated amount and higher simulation speed compared with the traditional fan detailed electromagnetic transient model and the averaging model.
Description
Technical Field
The invention relates to the technical field of power system simulation, in particular to a simplified electromagnetic transient simulation model, method, terminal and medium for a double-fed fan.
Background
With the large-scale access of wind power to a power grid system, wind power becomes a distributed power supply which is most widely applied in a modern power system, and meanwhile, the wind power also has great influence on the operation, maintenance, scheduling, control and protection and the like of the power grid. In order to analyze the influence and interaction mechanism of large-scale wind power access on a power system, the wind power unit modeling simulation needs to be carried out by means of a numerical electromagnetic transient simulation tool.
In the traditional power system analysis, a fan equivalent constant power source is generally neglected for the mechanical coupling characteristic of the fan, and in simulation software represented by Matlab/Simulink, the contents of a double-fed fan body, a converter, wind energy conversion and the like are generally constructed in full detail, so that various transient states and switching ripples in a motor can be accurately simulated, and the behavior characteristic of the fan can be well simulated. However, the model obtained by detailed modeling is often complex, and only the single-machine characteristic research of the fan is used, which must depend on a small step length; when the simulation scale is large and the number of switches in the topology is large, the simulation efficiency is reduced sharply, and the simulation time consumption can reach hours or even days. With the increasing demand for the simulation scale of the power system with large-scale wind power, the simulation model depending on the small step size obviously cannot meet the demand for the simulation scale, so a simplified model is urgently needed to achieve the balance between the simulation efficiency and the simulation precision.
Disclosure of Invention
The invention aims to provide a simplified electromagnetic transient simulation model, a simplified electromagnetic transient simulation method, a simplified electromagnetic transient simulation terminal and a simplified electromagnetic transient simulation medium for a double-fed fan, and aims to solve the problem that the conventional electromagnetic transient simulation model for the double-fed fan is only suitable for small-step modeling and cannot be suitable for large simulation scale.
In order to achieve the above object, the present invention provides a simplified electromagnetic transient simulation model of a doubly-fed wind turbine, comprising:
the equivalent model is simplified by a reactive control unit, an active control unit and a fan interface;
the reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model;
the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model;
the fan interface simplified equivalent model is used for receiving the fan equivalent internal potential and the active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid.
Further, preferably, in the simplified equivalent model of the wind turbine interface, the instantaneous three-phase grid-connected current of the wind turbine is:
in the formula ia、ib、icThree-phase network access current; i isMIn order to obtain the amplitude of the network-access current,
is a power factor angle, and theta is a power grid voltage angle; wherein the content of the first and second substances,
and IMSatisfies the following conditions:
further, preferably, the reactive power control unit includes: a wind power plant voltage control model and a reactive power control system model;
the wind power plant voltage control model is used for receiving a terminal voltage value and inputting an output reactive power reference value into the reactive power control system model;
and the reactive power control system model is used for generating equivalent inner potential of the fan according to a reactive power reference value and an input value of reactive power.
Further, preferably, the active control unit includes: the system comprises a wind power model, a rotor dynamic model, an active power control system model and a pitch angle control system model;
the wind power model is used for calculating mechanical power according to the ambient wind speed and inputting a value corresponding to the mechanical power to the rotor dynamic model;
the rotor dynamic model is used for calculating the rotating speed of the fan according to the mechanical power and inputting a value corresponding to the rotating speed of the fan to the active power control system model; the wind power model is also used for inputting a value corresponding to the rotating speed of the turbine to the wind power model;
the active power control system model is used for carrying out active control on the pitch angle control system model according to active power and terminal voltage values;
the pitch angle control system model is for inputting a pitch angle to the wind power model.
The invention also provides a simplified electromagnetic transient simulation method of the doubly-fed wind turbine, which comprises the following steps:
inputting the voltage value and the reactive power value to a reactive power control unit, and inputting the calculated equivalent inner potential of the fan to a fan interface simplified equivalent model;
inputting the ambient wind speed, the active power value and the terminal voltage value to an active control unit, and inputting the calculated active current instruction to the fan interface simplified equivalent model;
and calculating instantaneous three-phase network access current, three-phase alternating voltage instantaneous values and a power grid voltage phase angle of the wind driven generator by utilizing the fan interface simplified equivalent model.
Further, preferably, the calculating an instantaneous three-phase network current, an instantaneous three-phase ac voltage value and a grid voltage phase angle of the wind turbine generator by using the fan interface simplified equivalent model includes:
and performing electromagnetic transient simulation calculation by using an alternative solution method of a power grid voltage phase angle and a three-phase alternating current voltage instantaneous value.
Further, preferably, the alternating solution of the grid voltage phase angle and the instantaneous value of the three-phase ac voltage comprises:
calculating a power grid voltage phase angle at the current moment, and then calculating a three-phase alternating current voltage instantaneous value; alternatively, the first and second electrodes may be,
at the present moment, the instantaneous value of the three-phase alternating-current voltage is calculated, and then the voltage phase angle of the power grid is calculated.
Further, preferably, when the simulation step size is larger than a preset threshold, the compensation is performed for the grid voltage phase angle calculated at the next moment.
The present invention also provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, the one or more programs cause the one or more processors to implement the method for simplified electromagnetic transient simulation of a doubly-fed wind turbine as described in any of the above.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for simplified electromagnetic transient simulation of a doubly-fed wind turbine as set forth in any one of the above.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a simplified electromagnetic transient simulation model, a simplified electromagnetic transient simulation method, a simplified electromagnetic transient simulation terminal and a simplified electromagnetic transient simulation medium for a doubly-fed wind turbine, wherein the model comprises the following components: the equivalent model is simplified by a reactive control unit, an active control unit and a fan interface; the reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model; the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model; the fan interface simplified equivalent model is used for receiving a fan equivalent internal potential and active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid.
The invention simplifies the equivalent model by utilizing the fan interface, and considers the influence of the simulation step length on the controlled source result. Make electromagnetism transient state simulation model can be applicable to the wind power generation system level simulation analysis of big step through compensating the phase angle, can accurate simulation fan unit is at interchange wiring port department active/reactive characteristic, compares in the detailed electromagnetism transient state model of traditional fan and the homogenization model, has that the calculated amount is littleer, and the simulation speed is faster advantage.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a simplified electromagnetic transient simulation model of a doubly-fed wind turbine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a control method of a simplified electromagnetic transient simulation model of a doubly-fed wind turbine according to an embodiment of the present invention;
FIG. 3 is a simplified equivalent model circuit diagram of a current source injection based blower interface according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a value change process in a simulation calculation process according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a simplified electromagnetic transient simulation method for a doubly-fed wind turbine according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a simplified electromagnetic transient simulation model of a doubly-fed wind turbine, including:
the equivalent model is simplified by a reactive control unit, an active control unit and a fan interface;
the reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model;
the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model;
the fan interface simplified equivalent model is used for receiving the fan equivalent internal potential and the active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid.
It should be noted that, in recent years, the problems of fossil energy exhaustion and environmental pollution are becoming more severe, and wind energy is a clean and renewable new energy, and is highly valued and vigorously developed worldwide. The wind power generation technology is a technology for converting wind energy in nature into electric energy by using rotary wind power generation equipment and an electric device. The wind power generation system mainly comprises a wind turbine, a transmission device, a generator, an auxiliary system, an electric energy conversion system and the like. The specific process of energy conversion is as follows: the wind energy drives blades of a wind turbine to rotate, and the wind energy is converted into mechanical energy; the paddle rotates to transmit mechanical energy to the generator through the transmission device, and the generator performs cutting magnetic induction line motion to convert the mechanical energy into electric energy; the generated electric energy is converted into standard electric energy by the conversion device and is transmitted to a power grid or used by a local load. With the continuous development and progress of wind power generation technology and the continuous increase of installed capacity, the variable-speed constant-frequency double-fed wind power generation system becomes the most widely used mainstream scheme in the current wind power generation market due to the advantages of flexible control, wide range of operable wind speed and the like. However, in the existing power system analysis, the wind turbine is usually equivalent to a constant power source and neglects the mechanical coupling characteristic of the wind turbine, and then detailed construction is adopted for the doubly-fed wind turbine body, the converter, the wind energy conversion and the like in simulation software, so as to accurately simulate various transient states and switching ripples inside the motor, i.e. to accurately simulate the behavior characteristics of the wind turbine. However, the model obtained by such detailed modeling is often very complex and can only be applied to small-scale simulation situations with a small step size. However, as the demand for the simulation scale of the power system including large-scale wind power is continuously increased, the simulation model depending on the small step size obviously cannot meet the demand for the simulation scale, so the embodiment of the invention aims at simplifying the model to achieve the balance between the simulation efficiency and the simulation precision. The simplified model needs to be capable of reflecting the active and reactive transient characteristics of the fan unit port and the mechanical characteristics of the fan, and the high-frequency switch ripple characteristics can be simplified. And selecting a fully detailed model for occasions needing fine simulation, and selecting a simplified equivalent model for occasions of system-level analysis to balance simulation precision and simulation efficiency.
Specifically, the present embodiment mainly focuses on a simplified electromagnetic transient model of a doubly-fed wind turbine generator with active/reactive characteristics of a wind turbine unit at an ac connection port. The wind power generation system is equivalent to a controlled current source to be injected into a power grid interface, so that the influence of simulation step length on an injection current value is considered in an important mode. The structure of an electromagnetic transient simulation model of the double-fed wind power generation system is shown in fig. 1, the model omits the control of a power grid side converter, and mainly comprises three parts, namely a reactive power control part, an active power control part and a fan interface simplification equivalent model. The reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model; the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model; the fan interface simplified equivalent model is used for receiving a fan equivalent internal potential and active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid.
Referring to fig. 2, in one embodiment, the reactive power control unit includes: a wind power plant voltage control model and a reactive power control system model; the active control unit comprises: the system comprises a wind power model, a rotor dynamic model, an active power control system model and a pitch angle control system model.
Further, the wind power plant voltage control model is used for receiving a terminal voltage value and inputting an output reactive power reference value into the reactive power control system model;
and the reactive power control system model is used for generating equivalent inner potential of the fan according to the reactive power reference value and the input value of the reactive power.
The wind power model is used for calculating mechanical power according to the ambient wind speed and inputting a value corresponding to the mechanical power into the rotor dynamic model;
the rotor dynamic model is used for calculating the rotating speed of the fan according to the mechanical power and inputting a value corresponding to the rotating speed of the fan into the active power control system model; the wind power model is also used for inputting a value corresponding to the rotating speed of the turbine to the wind power model;
the active power control system model is used for carrying out active control on the pitch angle control system model according to the active power and the terminal voltage value;
the pitch angle control system model is used to input the pitch angle to the wind power model.
In particular, the meaning of the various parameters in fig. 2 is as follows: v represents the ambient wind speed, θrRepresenting pitch angle, ωrRepresenting turbine speed, ωgIndicating the rotational speed of the fan, PmRepresents mechanical power, PgRepresenting active power, QgRepresenting reactive power, UtRepresents terminal voltage, QcmdRepresenting a reactive power reference value, IgRepresenting the grid-connected current. Finally, the most simplified reactive control unitThe final output is E "qcmdThe final output of the reactive power control unit is IpcmdAnd indicating the active current command of the fan.
It should be noted that according to the control principle of the simplified electromagnetic transient simulation model of the doubly-fed wind turbine provided in fig. 2, the embodiment of the present invention only protects the interface logic between the different control modules, and since the internal implementation logics of the control modules of wind turbines of different manufacturers and different models are different, the specific implementation manner inside each controller is not protected.
Further, to help understand the working principle of the simplified equivalent model of the wind turbine interface, in a specific embodiment, a current source injection-based simplified equivalent model circuit diagram of the wind turbine interface is further provided. As shown in FIG. 3, E "qcmdDividing the first-order inertia link by the equivalent reactance X' of the fan to obtain a reactive current component reference value iqWherein the first-order inertia element is used for simulating the delay effect of the control system. I ispcmdObtaining an active current component reference value i after a first-order inertia link and a low-voltage power logic linkpThe low-voltage power logic link is used for restraining voltage drop during a fault and accelerating voltage recovery speed after the fault is cleared. According to the active and reactive component reference value i of the instantaneous network access current of the fanp，iqThe instantaneous three-phase grid-connected current of the wind driven generator at the moment can be obtained as follows:
in the formula ia、ib、icThree-phase network access current; i isMIn order to obtain the amplitude of the network-access current,
and the angle theta is a power factor angle and a power grid voltage angle, and can be obtained by phase-locking the three-phase terminal voltage instantaneous value through a phase-locked loop and adding a delay compensation angle.
Wherein the content of the first and second substances,
and IMSatisfies the following conditions:
alternatively, the electrical part and the control part are solved alternately when performing electromagnetic transient simulation calculation on the model. Among them, there are two typical solving orders: 1) calculating a control part first and then calculating an electric part; 2) the electric part is calculated first, and the control part is calculated later. The first solving sequence is taken as an example below to analyze the influence of the simulation step size on the model shown in fig. 2.
In particular, when the system is in steady state, ip，iqFor fixed value, the factor influencing the model of fig. 3 is mainly the grid phase angle θ. In which fig. 4 shows a numerical variation process in a simulation calculation process. It can be seen that the three-phase alternating voltage instantaneous value v obtained by solving at the moment tabcAnd starting to carry out phase-locked solution to obtain the grid voltage phase angle at the next time step, namely the grid voltage phase angle at the T + delta T moment is the value theta (T) at the T moment. I calculated by θ (t)k(T + Δ T) (k ═ a, b, c) has an error from the true value. It should be noted that when the simulation step size is smaller than or equal to the preset threshold (smaller), the error is negligible. However, when the simulation step size is larger than the preset threshold (larger), the theory will appearTo control the output current ip，iqThe value is different from the actually calculated and measured value, mainly the phase angle is different, and the modulus is still the same. Therefore, in order to eliminate the delay due to the calculation sequence, the controlled source calculation section is required to compensate. As can be seen from FIG. 4, θ (t) lags by vabc(T + Δ T) one simulation step, so θ can be calculated for PLL1Compensating for a lead angle thetaCNamely:
θ＝θ1+θC
θC＝ωΔT；
in the formula, ω is the grid angular frequency. I can be guaranteed after delay compensation is introducedp，iqThe reference value is consistent with the actually calculated and measured value in both phase angle and amplitude.
In summary, the simplified electromagnetic transient simulation model of the doubly-fed wind turbine provided by the embodiment of the invention utilizes the wind turbine interface to simplify the equivalent model, and considers the influence of the simulation step length on the controlled source result. Make electromagnetism transient state simulation model can be applicable to the wind power generation system level simulation analysis of big step through compensating the phase angle, can accurate simulation fan unit is at interchange wiring port department active/reactive characteristic, compares in the detailed electromagnetism transient state model of traditional fan and the homogenization model, has that the calculated amount is littleer, and the simulation speed is faster advantage.
Referring to fig. 5, based on the simplified electromagnetic transient simulation model of the doubly-fed wind turbine provided in the above embodiment, an embodiment of the present invention further provides a simplified electromagnetic transient simulation method of the doubly-fed wind turbine. As shown in fig. 5, the simplified electromagnetic transient simulation method for the doubly-fed wind turbine includes steps S10 to S30. The method comprises the following steps:
and S10, inputting the voltage value and the reactive power value of the input end to a reactive power control unit, and inputting the calculated equivalent inner potential of the fan to the fan interface simplified equivalent model.
It should be noted that the reactive power control unit includes: a wind power plant voltage control model and a reactive power control system model; the wind power plant voltage control model is used for receiving a terminal voltage value and inputting an output reactive power reference value into the reactive power control system model; and the reactive power control system model is used for generating equivalent inner potential of the fan according to the reactive power reference value and the input value of the reactive power. The active control unit comprises: the system comprises a wind power model, a rotor dynamic model, an active power control system model and a pitch angle control system model. The wind power model is used for calculating mechanical power according to the ambient wind speed, and inputting a value corresponding to the mechanical power to the rotor dynamic model; the rotor dynamic model is used for calculating the rotating speed of the fan according to the mechanical power and inputting a value corresponding to the rotating speed of the fan into the active power control system model; the wind power model is also used for inputting a value corresponding to the rotating speed of the turbine to the wind power model; the active power control system model is used for carrying out active control on the pitch angle control system model according to the active power and the terminal voltage value; the pitch angle control system model is used to input the pitch angle to the wind power model.
S20, inputting the ambient wind speed, the active power value and the terminal voltage value to an active control unit, and inputting the calculated active current instruction to the fan interface simplified equivalent model;
specifically, the instantaneous three-phase grid-connected current of the wind driven generator is as follows:
in the formula ia、ib、icThree-phase network access current; i isMIn order to obtain the amplitude of the network-access current,
is a power factor angle, theta is a power grid voltage angle and can be switched onAnd the phase-locked loop is used for locking the three-phase terminal voltage instantaneous value and adding a delay compensation angle to obtain the phase-locked loop.
Wherein the content of the first and second substances,
and IMSatisfies the following conditions:
and S30, calculating the instantaneous three-phase network access current, the instantaneous three-phase alternating voltage value and the grid voltage phase angle of the wind driven generator by utilizing the fan interface simplified equivalent model. Specifically, in the step S30, the electromagnetic transient simulation calculation is performed mainly by using an alternative solution of the grid voltage phase angle and the instantaneous value of the three-phase ac voltage, and includes: calculating a power grid voltage phase angle at the current moment, and then calculating a three-phase alternating current voltage instantaneous value; or firstly calculating the instantaneous value of the three-phase alternating-current voltage at the current moment and then calculating the voltage phase angle of the power grid.
In one specific embodiment, when the simulation step size is less than or equal to the preset threshold, the error is negligible. However, when the simulation step length is larger than the preset threshold, a larger difference exists between the current value to be theoretically controlled and output and the actually calculated and measured value, mainly the phase angle is different, and the modulus is still the same). In order to eliminate the delay caused by the calculation sequence, the controlled source calculation part is required to compensate, namely the network voltage phase angle calculated at the next moment.
It can be understood that the doubly-fed wind turbine simplified electromagnetic transient simulation method provided by the embodiment of the invention considers the influence of the simulation step length on the controlled source result by utilizing the wind turbine interface simplified equivalent model. Make electromagnetism transient state simulation model can be applicable to the wind power generation system level simulation analysis of big step through compensating the phase angle, can accurate simulation fan unit is at interchange wiring port department active/reactive characteristic, compares in the detailed electromagnetism transient state model of traditional fan and the homogenization model, has that the calculated amount is littleer, and the simulation speed is faster advantage.
Referring to fig. 6, an embodiment of the present invention provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, the one or more programs cause the one or more processors to implement the method for simplified electromagnetic transient simulation of doubly-fed wind turbines as described above.
The processor is used for controlling the overall operation of the terminal equipment so as to complete all or part of the steps of the simplified electromagnetic transient simulation method of the doubly-fed wind turbine. The memory is used to store various types of data to support operation at the terminal device, and these data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to perform the method for simplified electromagnetic transient simulation of a doubly-fed wind turbine according to any of the above embodiments, and achieve technical effects consistent with the above method.
In another exemplary embodiment, a computer readable storage medium is also provided, which comprises a computer program, which when executed by a processor, implements the steps of the simplified electromagnetic transient simulation method for a doubly-fed wind turbine as described in any of the above embodiments. For example, the computer readable storage medium may be the above-mentioned memory including a computer program, and the above-mentioned computer program may be executed by a processor of a terminal device to implement the simplified electromagnetic transient simulation method for the doubly-fed wind turbine according to any of the above-mentioned embodiments, and achieve the technical effects consistent with the above-mentioned method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a doubly-fed fan simplifies electromagnetism transient state simulation model which characterized in that includes:
the equivalent model is simplified by a reactive control unit, an active control unit and a fan interface;
the reactive power control unit is used for inputting the equivalent internal potential of the fan to the fan interface simplified equivalent model;
the active control unit is used for inputting an active current instruction of the fan to the fan interface simplified equivalent model;
the fan interface simplified equivalent model is used for receiving the fan equivalent internal potential and the active current instruction and enabling the wind power generation system to be equivalent to a controlled current source to be connected into a power grid.
2. The simplified electromagnetic transient simulation model of the doubly-fed wind turbine of claim 1, wherein in the simplified equivalent model of the wind turbine interface, the instantaneous three-phase grid-connected current of the wind turbine is as follows:
in the formula ia、ib、icThree-phase network access current; i isMIn order to obtain the amplitude of the network-access current,
is a power factor angle, and theta is a power grid voltage angle; wherein the content of the first and second substances,
and IMSatisfies the following conditions:
3. the simplified electromagnetic transient simulation model of the doubly-fed wind turbine as claimed in claim 1, wherein said reactive power control unit comprises: a wind power plant voltage control model and a reactive power control system model;
the wind power plant voltage control model is used for receiving a terminal voltage value and inputting an output reactive power reference value into the reactive power control system model;
and the reactive power control system model is used for generating equivalent inner potential of the fan according to a reactive power reference value and an input value of reactive power.
4. The simplified electromagnetic transient simulation model of the doubly-fed wind turbine as claimed in claim 1, wherein said active control unit comprises: the system comprises a wind power model, a rotor dynamic model, an active power control system model and a pitch angle control system model;
the wind power model is used for calculating mechanical power according to the ambient wind speed and inputting a value corresponding to the mechanical power to the rotor dynamic model;
the rotor dynamic model is used for calculating the rotating speed of the fan according to the mechanical power and inputting a value corresponding to the rotating speed of the fan to the active power control system model; the wind power model is also used for inputting a value corresponding to the rotating speed of the turbine to the wind power model;
the active power control system model is used for carrying out active control on the pitch angle control system model according to active power and terminal voltage values;
the pitch angle control system model is for inputting a pitch angle to the wind power model.
5. A simplified electromagnetic transient simulation method for a doubly-fed wind turbine is characterized by comprising the following steps:
inputting the voltage value and the reactive power value to a reactive power control unit, and inputting the calculated equivalent inner potential of the fan to a fan interface simplified equivalent model;
inputting the ambient wind speed, the active power value and the terminal voltage value to an active control unit, and inputting the calculated active current instruction to the fan interface simplified equivalent model;
and calculating instantaneous three-phase network access current, three-phase alternating voltage instantaneous values and a power grid voltage phase angle of the wind driven generator by utilizing the fan interface simplified equivalent model.
6. The simplified electromagnetic transient simulation method for the doubly-fed wind turbine of claim 5, wherein the calculating instantaneous three-phase grid-in current, three-phase alternating voltage instantaneous value and grid voltage phase angle of the wind turbine by using the simplified equivalent model of the wind turbine interface comprises:
and performing electromagnetic transient simulation calculation by using an alternative solution method of a power grid voltage phase angle and a three-phase alternating current voltage instantaneous value.
7. The simplified electromagnetic transient simulation method for the doubly-fed wind turbine as claimed in claim 6, wherein said alternating solution of the grid voltage phase angle and the instantaneous value of the three-phase ac voltage comprises:
calculating a power grid voltage phase angle at the current moment, and then calculating a three-phase alternating current voltage instantaneous value; alternatively, the first and second electrodes may be,
at the present moment, the instantaneous value of the three-phase alternating-current voltage is calculated, and then the voltage phase angle of the power grid is calculated.
8. The simplified electromagnetic transient simulation method for the doubly-fed wind turbine of claim 6, further comprising: and when the simulation step length is larger than a preset threshold value, compensating the grid voltage phase angle calculated at the next moment.
9. A terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of simplified electromagnetic transient simulation of a doubly fed wind turbine as claimed in any of claims 5 to 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for simplified electromagnetic transient simulation of a doubly-fed wind turbine as claimed in any one of claims 5 to 8.
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| CN117350089B (en) * | 2023-12-06 | 2024-04-02 | 山东大学 | Construction method and system of doubly-fed wind power plant full-dynamic impedance model |
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