Control method, device, equipment, medium and product of net-forming type permanent magnet wind power system

Abstract

The invention discloses a control method, device, equipment, medium and product of a network-forming type permanent magnet wind power system, and the method comprises the steps: calculating the maximum wind energy tracking power outputted by the network-forming type permanent magnet wind power system under the optimal wind energy tracking based on the maximum wind energy tracking coefficient; calculating a direct-current voltage damping control coefficient of a side damping controller according to the inertia coefficient and the damping coefficient of the direct-current voltage; calculating an electromagnetic power reference value output by the permanent magnet synchronous generator according to the maximum wind energy tracking power and the DC voltage damping control coefficient; and subtracting the electromagnetic power reference value from the electromagnetic power actual value, and inputting the difference value into a machine side active power controller so as to adjust the electromagnetic power output by the permanent magnet synchronous generator. According to the method, on the basis of not adding hardware equipment, the transient stability of the grid-forming type permanent magnet wind power system during the short-circuit fault period of the power grid can be remarkably improved only by changing the control strategy of the machine-side converter of the grid-forming type permanent magnet wind power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation technology, and particularly relates to a control method, device, equipment, medium and product of a grid-connected permanent magnet wind power system. BACKGROUND

[0002] With the significant increase of wind power penetration in new power systems and the continuous extension of new energy transmission channels, the grid damping and inertia gradually weaken, and the grid-connected wind power system has attracted widespread attention and research due to its ability to actively build voltage and frequency for the grid. Since there is interaction between the grid-connected wind power system and the grid, there is a high risk of transient instability when a short-circuit fault occurs in the grid, which restricts the development and utilization of wind energy. Therefore, in order to improve the transient stability of the grid-connected wind power system, it is necessary to further study the transient stability improvement strategy of the grid-connected wind power system under short-circuit fault. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a control method, device, equipment, medium and product of a grid-connected permanent magnet wind power system, which can significantly improve the transient stability of the grid-connected permanent magnet wind power system during a short-circuit fault in the grid without increasing hardware devices, by only changing the control strategy of the machine-side converter of the grid-connected permanent magnet wind power system.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the present application provides a control method of a grid-connected permanent magnet wind power system, which is applied to a machine-side damping controller of the grid-connected permanent magnet wind power system, the machine-side damping controller is configured in a machine-side converter controller of the grid-connected permanent magnet wind power system, and the method comprises the following steps:

[0005] Based on a maximum wind energy tracking coefficient, a maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated;

[0006] According to the inertia coefficient and the damping coefficient of the direct current voltage, a direct current voltage damping control coefficient of the machine-side damping controller is calculated;

[0007] According to the maximum wind energy tracking power and the direct current voltage damping control coefficient, an electromagnetic power reference value output by a permanent magnet synchronous generator is calculated;

[0008] The electromagnetic power reference value is subtracted from an actual electromagnetic power value, and the difference value is input to a machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator.

[0009] As an improvement of the above-mentioned scheme, the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated based on a maximum wind energy tracking coefficient, and specifically comprises the following steps:

[0010] acquire rotor speed, swept area of wind turbine, air density, maximum wind energy utilization coefficient and its corresponding tip speed ratio, pitch angle;

[0011] calculate maximum wind energy tracking coefficient according to the swept area of wind turbine, the air density, the maximum wind energy utilization coefficient and its corresponding tip speed ratio, pitch angle;

[0012] calculate maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking according to the maximum wind energy tracking coefficient and the rotor speed.

[0013] As an improvement of the above scheme, the calculation formula of the maximum wind energy tracking power is:

[0014]

[0015] In the formula, P MPPT is the maximum wind energy tracking power; K is the maximum wind energy tracking coefficient; ω r is the rotor speed; S is the swept area of wind turbine; ρ is the air density; C pmax and λ, β are the maximum wind energy utilization coefficient and its corresponding tip speed ratio, pitch angle.

[0016] As an improvement of the above scheme, the calculation of the DC voltage damping control coefficient of the machine-side damping controller according to the inertia coefficient and the damping coefficient of the DC voltage specifically includes:

[0017] calculate the inertia coefficient of the DC voltage according to the DC capacitor of the grid-connected permanent magnet wind power system;

[0018] calculate the damping coefficient of the DC voltage according to the inertia coefficient of the DC voltage, the maximum wind energy tracking power, the active power output by the grid-side converter of the grid-connected permanent magnet wind power system, and the DC voltage of the grid-connected permanent magnet wind power system;

[0019] calculate the DC voltage damping control coefficient of the machine-side damping controller according to the damping coefficient of the DC voltage, the maximum wind energy tracking power, and the DC voltage rating of the grid-connected permanent magnet wind power system.

[0020] As an improvement of the above scheme, the calculation formula of the DC voltage damping control coefficient is:

[0021]

[0022] In the formula, k s is the DC voltage damping control coefficient; J dc is the inertia coefficient of the DC voltage; D dc is the damping coefficient of the DC voltage; Cdc is a direct current capacity; P g is an active power outputted by a grid-connection type permanent magnet wind power system grid-side converter; U dc is a direct current voltage of the grid-connection type permanent magnet wind power system; U dc0 is a direct current voltage rated value; s is a differential operator.

[0023] As an improvement of the above scheme, the calculation formula of the electromagnetic power reference value is:

[0024]

[0025] In the formula, P e_ref is an electromagnetic power reference value.

[0026] The embodiment of the present application further provides a control device of a grid-connection type permanent magnet wind power system, which is applied to a machine-side damping controller of the grid-connection type permanent magnet wind power system, the machine-side damping controller is configured in a machine-side converter controller of the grid-connection type permanent magnet wind power system, and the device comprises:

[0027] A first calculation module, which is used for calculating a maximum wind energy tracking power outputted by the grid-connection type permanent magnet wind power system under optimal wind energy tracking based on a maximum wind energy tracking coefficient;

[0028] A second calculation module, which is used for calculating a direct current voltage damping control coefficient of the machine-side damping controller according to an inertia coefficient and a damping coefficient of the direct current voltage;

[0029] A third calculation module, which is used for calculating an electromagnetic power reference value outputted by a permanent magnet synchronous generator according to the maximum wind energy tracking power and the direct current voltage damping control coefficient;

[0030] A control module, which is used for subtracting an actual electromagnetic power value from the electromagnetic power reference value and inputting a difference value into a machine-side active power controller so as to adjust the electromagnetic power outputted by the permanent magnet synchronous generator.

[0031] The embodiment of the present application further provides a terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and the processor realizes the control method of the grid-connection type permanent magnet wind power system according to any one of the above when executing the computer program.

[0032] The embodiment of the present application further provides a computer readable storage medium, which comprises a stored computer program, and when the computer program runs, the computer readable storage medium controls a device where the computer readable storage medium is located to execute the control method of the grid-connection type permanent magnet wind power system according to any one of the above.

[0033] The embodiment of the present application also provides a computer program product, which comprises a computer program or computer instructions, and the computer program or the computer instructions are executed by a processor to realize the control method of the grid-connected permanent magnet wind power system.

[0034] The control method, device, equipment, medium and product of the grid-connected permanent magnet wind power system provided by the embodiment of the present application have the beneficial effects that: by adding a machine-side damping controller in the machine-side converter controller of the grid-connected permanent magnet wind power system, the machine-side damping controller calculates the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking based on a maximum wind energy tracking coefficient; the DC voltage damping control coefficient of the machine-side damping controller is calculated according to an inertia coefficient and a damping coefficient of the DC voltage; the electromagnetic power reference value output by the permanent magnet synchronous generator is calculated according to the maximum wind energy tracking power and the DC voltage damping control coefficient; the electromagnetic power reference value is subtracted from the actual electromagnetic power value, and the difference is input to the machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator. The embodiment of the present application does not increase hardware equipment, only changes the control strategy of the machine-side converter of the grid-connected permanent magnet wind power system, enhances the damping effect of the grid-connected permanent magnet wind power system through the additional machine-side damping controller, adjusts the electromagnetic power output by the permanent magnet synchronous generator according to the change of the DC voltage, and further improves the transient stability of the grid-connected permanent magnet wind power system during the short-circuit fault of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a flowchart of a preferred embodiment of the control method of the grid-connected permanent magnet wind power system provided by the present application;

[0036] Figure 2 is a structural schematic diagram of the grid-connected permanent magnet wind power system connecting to an AC power grid in the control method of the grid-connected permanent magnet wind power system provided by the present application;

[0037] Figure 3 is a structural schematic diagram of the machine-side damping controller in the control method of the grid-connected permanent magnet wind power system provided by the present application;

[0038] Figure 4 is a simulation waveform diagram of the grid-connected permanent magnet wind power system under the short-circuit fault of the power grid, using the traditional control strategy and using the machine-side damping controller designed by the present application;

[0039] Figure 5 is a structural schematic diagram of a preferred embodiment of the control device of the grid-connected permanent magnet wind power system provided by the present application;

[0040] Figure 6is a structural schematic view of a preferred embodiment of a terminal device provided by the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Please refer to Figure 1 , Figure 1 is a flow schematic view of a preferred embodiment of a control method of a grid-connected permanent magnet wind power system provided by the present application. The control method of the grid-connected permanent magnet wind power system is applied to a machine-side damping controller of the grid-connected permanent magnet wind power system, the machine-side damping controller is configured in a machine-side converter controller of the grid-connected permanent magnet wind power system, and the method comprises the following steps:

[0043] S1, calculating maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking based on a maximum wind energy tracking coefficient;

[0044] S2, calculating a direct-current voltage damping control coefficient of the machine-side damping controller according to an inertia coefficient and a damping coefficient of the direct-current voltage;

[0045] S3, calculating an electromagnetic power reference value output by a permanent magnet synchronous generator according to the maximum wind energy tracking power and the direct-current voltage damping control coefficient;

[0046] S4, subtracting an actual electromagnetic power value from the electromagnetic power reference value and inputting a difference value to a machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator.

[0047] It should be noted that, for the transient stability improvement strategy of the grid-connected permanent magnet wind power system under a power grid short-circuit fault, scholars at home and abroad have carried out relevant researches, such as the following published literatures:

[0048] [1] WANG Guangyu, FU Lijun, HU Qi, et al. Transient synchronization stability of grid-forming converter during grid fault considering transient switched operation mode[J]. IEEE Transactions on Sustainable Energy, 2023, 14(3): 1504-1515.

[0049] [2] S. Yazdani, M. Davari, M. Ferdowsi, et al. Internal Model Power Synchronization Control of a PV-Based Voltage-Source Converter in Weak-Grid and Islanded Conditions[J]. IEEE Transactions on Sustainable Energy, 2021, 12(2): 1360-1371.

[0050] Literature [1] analyzes the transient instability characteristics of grid-forming grid-connected inverters under current limiting, and proposes a transient stability improvement strategy for adjusting the phase of the saturation current according to the power angle under current limiting, but this strategy considers that the DC bus voltage remains constant, ignores the influence of the machine-side converter on the transient stability of the wind power system, and does not realize the coordinated control of the machine and grid-side converters, so the proposed strategy has limited effect on the transient stability improvement of the wind power grid-connected system containing back-to-back converters. Literature [2] proposes to introduce the compensation power output by the DC bus voltage controller into the virtual synchronous active power instruction to control the stability of the DC bus voltage while maintaining virtual synchronous control, thereby improving the transient stability of the system. However, considering the large differences in characteristics between photovoltaic cells and the motor of the permanent magnet wind power system and its machine-side converter, the applicability of this strategy in the permanent magnet wind power system is not clear.

[0051] Based on this, the embodiment of the present application designs a machine-side damping controller suitable for grid-forming permanent magnet wind power systems. Specifically, please refer to Figure 2 and Figure 3 , Figure 2 is a structure diagram of a grid-forming permanent magnet wind power system connected to an AC power grid in a control method of the grid-forming permanent magnet wind power system provided by the present application, Figure 3This is a schematic diagram of the machine-side damping controller in the control method for a grid-connected permanent magnet wind power system provided by this invention. The grid-connected permanent magnet wind power system includes a wind turbine, a DC capacitor, a back-to-back converter, and an LC filter. The system is connected to the AC power grid via multiple lines and transformers. The control method for the grid-connected permanent magnet wind power system provided in this embodiment is applied to the machine-side damping controller of the system, which is configured in the machine-side converter controller. In this embodiment, the grid-connected permanent magnet wind power system uses a generator-based approach, detecting the electromagnetic power P output by the permanent magnet synchronous generator. e Detecting the DC bus voltage U of the permanent magnet wind power system dc Based on the maximum wind energy tracking coefficient K, the maximum wind energy tracking power P output by the grid-type permanent magnet wind power system under optimal wind energy tracking is calculated. MPPT The aforementioned physical quantities are then used as input signals for the machine-side damping controller for subsequent control. Under the action of the machine-side damping controller, the inertia coefficient J of the DC voltage is used... dc and damping coefficient D dc The DC voltage damping control coefficient k of the computer-side damping controller s Based on the maximum wind energy tracking power P MPPT And the DC voltage damping control coefficient k of the machine-side damping controller s Calculate the reference value P of the electromagnetic power output of the permanent magnet synchronous generator. e_ref The electromagnetic power reference value P e_ref The difference P from the actual value of electromagnetic power e and the difference ΔP e The input is sent to the active power controller on the generator side to adjust the electromagnetic power output of the permanent magnet synchronous generator, so as to achieve electromagnetic power tracking of the reference value.

[0052] This invention, through the design of a corresponding machine-side damping controller, addresses the issue that during grid short-circuit faults, the limited capacity of the grid-side converter restricts the output power of the grid-type permanent magnet wind power system based on DC voltage synchronization, causing changes in its DC-side voltage. The machine-side converter adaptively adjusts its active power output according to these changes to maintain relative DC voltage stability, thereby achieving coordinated fault ride-through control between the machine-side and grid-side converters and enhancing the transient stability of the grid-type permanent magnet wind power system.

[0053] In another preferred embodiment, step S1, based on the maximum wind energy tracking coefficient, calculates the maximum wind energy tracking power output of the grid-type permanent magnet wind power system under optimal wind energy tracking, specifically including:

[0054] S101, acquire rotor speed, swept area of wind turbine, air density, maximum wind energy utilization coefficient and its corresponding tip speed ratio and pitch angle;

[0055] S102, calculate the maximum wind energy tracking coefficient according to the swept area of wind turbine, the air density, the maximum wind energy utilization coefficient and its corresponding tip speed ratio and pitch angle;

[0056] S103, calculate the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking according to the maximum wind energy tracking coefficient and the rotor speed.

[0057] As a preferred solution, the calculation formula of the maximum wind energy tracking power is:

[0058]

[0059] In the formula, P MPPT is the maximum wind energy tracking power; K is the maximum wind energy tracking coefficient; ω r is the rotor speed; S is the swept area of wind turbine; ρ is the air density; C pmax and λ, β are the maximum wind energy utilization coefficient and its corresponding tip speed ratio and pitch angle.

[0060] Specifically, in the calculation of the maximum wind energy tracking power, the rotor speed ω r , the swept area S of wind turbine, the air density ρ, the maximum wind energy utilization coefficient C pmax and its corresponding tip speed ratio λ and pitch angle β are acquired. According to the swept area S of wind turbine, the air density ρ, the maximum wind energy utilization coefficient C pmax and its corresponding tip speed ratio λ and pitch angle β, the maximum wind energy tracking coefficient K is calculated. According to the maximum wind energy tracking coefficient K and the rotor speed ω r , the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated.

[0061] In another preferred embodiment, the S2, according to the inertia coefficient and the damping coefficient of the direct current voltage, calculates the direct current voltage damping control coefficient of the machine-side damping controller, specifically comprising:

[0062] S201, according to the direct current capacitor of the grid-connected permanent magnet wind power system, calculate the inertia coefficient of the direct current voltage;

[0063] S202, according to the inertia coefficient of the direct current voltage, the maximum wind energy tracking power, the active power output by the grid-side converter of the grid-connected permanent magnet wind power system and the direct current voltage of the grid-connected permanent magnet wind power system, calculate the damping coefficient of the direct current voltage.

[0064] S203, calculate the DC voltage damping control coefficient of the machine-side damping controller based on the damping coefficient of the DC voltage, the maximum wind energy tracking power, and the rated DC voltage of the grid-type permanent magnet wind power system.

[0065] As a preferred embodiment, the formula for calculating the DC voltage damping control coefficient is as follows:

[0066]

[0067] In the formula, k s J is the DC voltage damping control coefficient; dc D is the inertia coefficient of DC voltage; dc C is the damping coefficient of the DC voltage; dc For DC capacitors; P g For the active power output of the grid-side converter in a grid-type permanent magnet wind power system; U dc For grid-type permanent magnet wind power systems, the DC voltage is U. dc0 is the rated DC voltage; s is the differential operator.

[0068] Specifically, in this embodiment of the invention, when setting the DC voltage damping control coefficient of the computer-side damping controller, the DC capacitance C of the grid-type permanent magnet wind power system is considered. dc Calculate the inertia coefficient of DC voltage. Based on the inertia coefficient J of DC voltage dc Maximum wind energy tracking power P MPPT The active power P output by the grid-side converter of a grid-type permanent magnet wind power system g and the DC voltage U of the grid-type permanent magnet wind power system dc Calculate the damping coefficient of DC voltage. Based on the damping coefficient D of DC voltage dc Maximum wind energy tracking power P MPPT and the rated DC voltage U of the grid-type permanent magnet wind power system dc0 The DC voltage damping control coefficient k of the computer-side damping controller s .

[0069] As a preferred embodiment, the formula for calculating the electromagnetic power reference value is:

[0070]

[0071] In the formula, P e_ref This is a reference value for electromagnetic power.

[0072] Specifically, in this embodiment of the invention, the maximum wind energy tracking power P is used as the basis for the following: MPPT DC voltage damping control coefficient ks DC voltage U of the grid-connected permanent magnet wind power system dc and the DC voltage rating value U dc0 , calculate the electromagnetic power reference value output by the permanent magnet synchronous generator

[0073] It should be noted that in the permanent magnet wind power system, the actual value P e of the electromagnetic power is the output of the system, and the electromagnetic power reference value P e_ref is the desired output value. By calculating the difference between the two (i.e. the error), the controller can adjust the input of the system according to this error to reduce the error and make the actual output of the electromagnetic power close to the reference value. Therefore, let P e＝ P e_ref , and be substituted into the formula , then , the formula is converted to

[0074] Please refer to Figure 4 , Figure 4 is a simulation waveform diagram of a grid-connected permanent magnet wind power system provided by the present application under short-circuit fault of the power grid using a traditional control strategy and using the machine-side damping controller designed by the present application. At 3s, a three-phase short-circuit fault occurs in the power grid, and Figure 4 (a)-(d) shows that when the grid-connected permanent magnet wind power system uses the traditional control strategy, the grid-connected permanent magnet wind power system has a frequency rise out-of-step, the active power cannot be restored to the normal value, and the DC bus voltage appears unstable. From Figure 4 (e)-(h) shows that when the grid-connected permanent magnet wind power system increases the machine-side damping controller designed by the present application, it can be seen from the simulation results that under the action of the machine-side damping controller, the grid-connected permanent magnet wind power system can quickly recover to a synchronous stable state during the fault period and after the fault is cleared, and the DC bus voltage can remain stable, effectively improving the transient synchronous stability of the grid-connected permanent magnet wind power system.

[0075] As can be seen, the machine-side damping controller designed by the present application can make the transient regulation process of the grid-connected permanent magnet wind power system fast and smooth, and significantly improve the low voltage ride-through capability of the grid-connected permanent magnet wind power system during the fault period.

[0076] Correspondingly, the present application also provides a control device of a grid-connected permanent magnet wind power system, which can realize all processes of the control method of the grid-connected permanent magnet wind power system in the above-mentioned embodiments.

[0077] Please refer to Figure 5 , Figure 5is a structural schematic view of a preferred embodiment of a control device of a grid-connected permanent magnet wind power system provided by the present application. The control device of the grid-connected permanent magnet wind power system is applied to a machine-side damping controller of the grid-connected permanent magnet wind power system, the machine-side damping controller is configured in a machine-side converter controller of the grid-connected permanent magnet wind power system, and the device comprises:

[0078] A first calculation module 501 is configured to calculate a maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking based on a maximum wind energy tracking coefficient.

[0079] A second calculation module 502 is configured to calculate a direct-current voltage damping control coefficient of the machine-side damping controller according to an inertia coefficient and a damping coefficient of the direct-current voltage.

[0080] A third calculation module 503 is configured to calculate an electromagnetic power reference value output by a permanent magnet synchronous generator according to the maximum wind energy tracking power and the direct-current voltage damping control coefficient.

[0081] A control module 504 is configured to subtract the electromagnetic power reference value from an actual electromagnetic power value and input a difference value to a machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator.

[0082] Preferably, the first calculation module 501 is specifically configured to:

[0083] acquire a rotor speed, an area swept by a wind turbine, an air density, a maximum wind energy utilization coefficient and a corresponding tip speed ratio and pitch angle;

[0084] calculate the maximum wind energy tracking coefficient according to the area swept by the wind turbine, the air density, the maximum wind energy utilization coefficient and the corresponding tip speed ratio and pitch angle;

[0085] calculate the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking according to the maximum wind energy tracking coefficient and the rotor speed.

[0086] Preferably, a calculation formula of the maximum wind energy tracking power is as follows:

[0087]

[0088] In the formula, P is the maximum wind energy tracking power, K is the maximum wind energy tracking coefficient, ω is the rotor speed, S is the area swept by the wind turbine, ρ is the air density, C is the maximum wind energy utilization coefficient, λ is the corresponding tip speed ratio, and β is the pitch angle. MPPT r pmax

[0089] ​​​Preferably, the second calculation module 502 is specifically used for:

[0090] According to the DC capacitor of the grid-connected permanent magnet wind power system, an inertia coefficient of the DC voltage is calculated;

[0091] According to the inertia coefficient of the DC voltage, the maximum wind energy tracking power, an active power output by a grid-side converter of the grid-connected permanent magnet wind power system, and the DC voltage of the grid-connected permanent magnet wind power system, a damping coefficient of the DC voltage is calculated;

[0092] According to the damping coefficient of the DC voltage, the maximum wind energy tracking power, and a DC voltage rated value of the grid-connected permanent magnet wind power system, a DC voltage damping control coefficient of the machine-side damping controller is calculated.

[0093] Preferably, a calculation formula of the DC voltage damping control coefficient is as follows:

[0094]

[0095] In the formula, k s is the DC voltage damping control coefficient; J dc is the inertia coefficient of the DC voltage; D dc is the damping coefficient of the DC voltage; C dc is the DC capacitor; P g is the active power output by the grid-side converter of the grid-connected permanent magnet wind power system; U dc is the DC voltage of the grid-connected permanent magnet wind power system; U dc0 is the DC voltage rated value; and s is a differential operator.

[0096] Preferably, a calculation formula of the electromagnetic power reference value is as follows:

[0097]

[0098] In the formula, P e_ref is the electromagnetic power reference value.

[0099] In specific implementation, the working principle, control flow and technical effects of the control device of the grid-connected permanent magnet wind power system provided by the embodiment of the present application are the same as those of the control method of the grid-connected permanent magnet wind power system in the above embodiment, and thus will not be repeated here.

[0100] Please refer to Figure 6 , Figure 6is a structural schematic diagram of a preferred embodiment of a terminal device provided by the present application. The terminal device comprises a processor 601, a memory 602, and a computer program stored in the memory 602 and configured to be executed by the processor 601, and the processor 601 implements the control method of the network-constructed permanent-magnet wind power system according to any one of the above-mentioned embodiments when executing the computer program.

[0101] Preferably, the computer program can be divided into one or more modules / units (such as computer program 1, computer program 2, …), which are stored in the memory 602 and executed by the processor 601 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the terminal device.

[0102] The processor 601 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor 601 can also be any conventional processor. The processor 601 is the control center of the terminal device, and connects various parts of the terminal device through various interfaces and lines.

[0103] The memory 602 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function, etc., and the data storage area can store related data, etc. In addition, the memory 602 can be a high-speed random access memory, and can also be a non-volatile memory, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., or the memory 602 can also be other volatile solid-state storage devices.

[0104] It should be noted that the above-mentioned terminal device can include, but is not limited to, a processor and a memory, and those skilled in the art can understand that, Figure 6The structural schematic diagram is merely an example of the terminal device and does not constitute a limitation on the terminal device, and can include more or fewer components than the diagram, or combine certain components, or different components.

[0105] The embodiment of the present application also provides a computer readable storage medium, which comprises a stored computer program, wherein the computer program controls a device where the computer readable storage medium is located to perform the control method of the grid-connected permanent magnet wind power system according to any one of the preceding embodiments when the computer program is running.

[0106] The embodiment of the present application also provides a computer program product, which comprises a computer program or computer instructions, and the computer program or the computer instructions are executed by a processor to implement the control method of the grid-connected permanent magnet wind power system according to any one of the preceding embodiments.

[0107] The embodiment of the present application provides a control method, device, equipment, medium and product of a grid-connected permanent magnet wind power system, an additional machine-side damping controller is added in a machine-side converter controller of the grid-connected permanent magnet wind power system, the machine-side damping controller calculates a maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking based on a maximum wind energy tracking coefficient; a direct current voltage damping control coefficient of the machine-side damping controller is calculated according to an inertia coefficient and a damping coefficient of the direct current voltage; an electromagnetic power reference value output by a permanent magnet synchronous generator is calculated according to the maximum wind energy tracking power and the direct current voltage damping control coefficient; the electromagnetic power reference value is subtracted from an actual electromagnetic power value, and the difference is input to a machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator. The embodiment of the present application does not increase hardware equipment, only changes the control strategy of the machine-side converter of the grid-connected permanent magnet wind power system, enhances the damping effect of the grid-connected permanent magnet wind power system through the additional machine-side damping controller, adjusts the electromagnetic power output by the permanent magnet synchronous generator according to the change of the direct current voltage, and further improves the transient stability of the grid-connected permanent magnet wind power system during a short-circuit fault of a power grid.

[0108] It should be noted that the system embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. In addition, the connection relationship between the modules in the system embodiment provided by the present application indicates that there is a communication connection between them, which can be realized as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0109] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can also make several improvements and refinements, these improvements and refinements are also considered the scope of protection of the present application.

Claims

1. A control method of a grid-forming permanent-magnet wind power system, characterized in that, The machine side damping controller applied to the grid-connected permanent magnet wind power system is configured in a machine side converter controller of the grid-connected permanent magnet wind power system, and the method comprises the following steps: Based on the maximum wind energy tracking coefficient, the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated; According to the inertia coefficient and the damping coefficient of the direct current voltage, the direct current voltage damping control coefficient of the machine side damping controller is calculated; According to the maximum wind energy tracking power and the direct current voltage damping control coefficient, the electromagnetic power reference value output by the permanent magnet synchronous generator is calculated; The difference between the electromagnetic power reference value and the actual value of the electromagnetic power is input into the machine side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator.

2. The control method of the network configuration type permanent magnet wind power system according to claim 1, characterized in that, The maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated based on the maximum wind energy tracking coefficient, and specifically comprises the following steps: The rotor speed, the swept area of the wind turbine, the air density, the maximum wind energy utilization coefficient and the corresponding tip speed ratio and pitch angle are obtained; The maximum wind energy tracking coefficient is calculated according to the swept area of the wind turbine, the air density, the maximum wind energy utilization coefficient and the corresponding tip speed ratio and pitch angle; The maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking is calculated according to the maximum wind energy tracking coefficient and the rotor speed.

3. The control method of the network configuration type permanent magnet wind power system according to claim 2, characterized in that, The calculation formula of the maximum wind energy tracking power is: where P MPPT is the maximum wind energy tracking power; K is the maximum wind energy tracking coefficient; ω r is the rotor speed; S is the swept area of the wind turbine; p is the air density; C pmax and λ, β are the maximum wind energy utilization coefficient and its corresponding tip speed ratio and pitch angle.

4. The control method of the network configuration type permanent magnet wind power system according to claim 3, characterized in that, The direct current voltage damping control coefficient of the machine side damping controller is calculated according to the inertia coefficient and the damping coefficient of the direct current voltage, and specifically comprises the following steps: The inertia coefficient of the direct current voltage is calculated according to the direct current capacitor of the grid-connected permanent magnet wind power system; The damping coefficient of the direct current voltage is calculated according to the inertia coefficient of the direct current voltage, the maximum wind energy tracking power, the active power output by the grid side converter of the grid-connected permanent magnet wind power system and the direct current voltage of the grid-connected permanent magnet wind power system; The direct current voltage damping control coefficient of the machine side damping controller is calculated according to the damping coefficient of the direct current voltage, the maximum wind energy tracking power and the direct current voltage rating of the grid-connected permanent magnet wind power system.

5. The control method of the network configuration type permanent magnet wind power system according to claim 4, characterized in that, The calculation formula of the direct current voltage damping control coefficient is: wherein k s is a direct voltage damping control coefficient; J dc is an inertia coefficient of the direct voltage; D dc is a damping coefficient of the direct voltage; C dc is a direct current capacitor; P g is an active power output by a grid-forming permanent magnet wind power system grid-side converter; U dc is a direct voltage of the grid-forming permanent magnet wind power system; U dc0 is a direct voltage rated value; s is a differential operator.

6. The control method of the network configuration type permanent magnet wind power system according to claim 5, characterized in that, The calculation formula of the electromagnetic power reference value is: In the formula, P e_ref is the electromagnetic power reference value.

7. A control device of a grid-connected permanent-magnet wind power system, characterized by comprising: The machine side damping controller applied to the grid-connected permanent magnet wind power system is configured in the machine side converter controller of the grid-connected permanent magnet wind power system, and the device comprises the following steps: The first calculation module is used to calculate the maximum wind energy tracking power output by the grid-connected permanent magnet wind power system under optimal wind energy tracking based on the maximum wind energy tracking coefficient; The second calculation module is used to calculate the direct current voltage damping control coefficient of the machine side damping controller according to the inertia coefficient and the damping coefficient of the direct current voltage; The third calculation module is used to calculate the electromagnetic power reference value output by the permanent magnet synchronous generator according to the maximum wind energy tracking power and the direct current voltage damping control coefficient; A control module is configured to subtract the electromagnetic power reference value from an actual electromagnetic power value and input the difference to a machine-side active power controller to adjust the electromagnetic power output by the permanent magnet synchronous generator.

8. A terminal device, comprising: The control method of the grid-connected permanent magnet wind power system according to any one of claims 1 to 6 is implemented by a processor executing a computer program stored in a memory.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and a device in which the computer readable storage medium is located implements the control method of the grid-connected permanent magnet wind power system according to any one of claims 1 to 6 when executing the computer program.

10. A computer program product, characterised in that, The computer program product includes a computer program or computer instructions, and the control method of the grid-connected permanent magnet wind power system according to any one of claims 1 to 6 is implemented when the computer program or the computer instructions are executed by a processor.

Images