Overload control method of brake resistor, pitch controller and main controller

Abstract

The present invention provides an overload control method for a brake resistor, a pitch controller and a main controller. The method comprises: in response to a wind turbine being in a power feeding state, obtaining the actual discharge energy of the brake resistor, wherein the actual discharge energy is used to characterize the excess energy consumed by the brake resistor in the power feeding state; determining the overload state type of the brake resistor according to the actual discharge energy and the preset overload energy; determining the corresponding overload control strategy according to the overload state type, solving the technical problem that the brake resistor can only be identified and passively replaced after it is damaged, and achieving the technical effect of identifying the risk of bad parts in advance to protect the brake resistor.

Description

Technical Field

[0001] The present application relates to the field of wind power technology, and in particular to an overload control method of a braking resistor, a pitch controller and a main controller. Background Art

[0002] In order to prevent the DC bus from overvoltage and consume the energy fed by the pitch motor, the wind turbine pitch drive needs to open the brake resistor to discharge. The brake resistor, as the terminal actuator, passively accepts the discharge power. As the random type increases and the motor energy feed increases, the rated power and volume of the brake resistor need to be greatly increased to meet the discharge requirements under any working conditions.

[0003] However, the existing technology does not monitor and protect the actual energy discharge and working status of the brake resistor, and can only identify and passively replace it after a fault or damage occurs. Summary of the invention

[0004] In view of this, the present application provides an overload control method for a brake resistor, a pitch controller and a main controller, which solve the technical problem that the brake resistor can only be identified and passively replaced after it is damaged.

[0005] As a first aspect of the present application, the present application provides an overload control method for a braking resistor, comprising: in response to a wind turbine being in a power feeding state, obtaining an actual discharge energy of the braking resistor, wherein the actual discharge energy is used to characterize excess energy consumed by the braking resistor from the power feeding state; determining the overload state type of the braking resistor based on the actual discharge energy and a preset overload energy; and determining a corresponding overload control strategy based on the overload state type.

[0006] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is less than the first preset overload energy, the overload state type of the braking resistor is determined to be a first overload state, wherein the first preset overload energy is the product of a first preset overload coefficient and the first preset energy of the braking resistor; and the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the first overload state as: controlling the blade pitch angle of the current wind turbine to remain unchanged.

[0007] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the first preset overload energy and less than the second preset overload energy, the overload state type of the braking resistor is determined to be the second overload state, wherein the second preset overload energy is the product of the second preset overload coefficient and the second preset energy of the braking resistor, wherein the second preset overload coefficient is greater than the first preset overload coefficient, and the second preset energy is greater than the first preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the second overload state as: reducing the reduction rate of the blade pitch angle of the current wind turbine.

[0008] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the second preset overload energy and less than the third preset overload energy, the overload state type of the braking resistor is determined to be the third overload state, wherein the third preset overload energy is the product of a third preset overload coefficient and the third preset energy of the braking resistor, wherein the third preset overload coefficient is greater than the second preset overload coefficient, and the third preset energy is greater than the second preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the third overload state as: synchronously reducing the pitch angles of all blades of the current wind turbine set.

[0009] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the third preset overload energy and less than the fourth preset overload energy, the overload state type of the braking resistor is determined to be a fourth overload state, wherein the fourth preset overload energy is the product of a fourth preset overload coefficient and a fourth preset energy of the braking resistor, wherein the fourth preset overload coefficient is greater than the third preset overload coefficient, and the fourth preset energy is greater than the third preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the fourth overload state as: limiting the output power of the generator in the wind turbine.

[0010] In a possible implementation of the present application, obtaining the actual discharge energy of the braking resistor includes: obtaining the actual discharge power of the braking resistor, the actual discharge power is used to characterize the excess power consumed by the braking resistor from the energy feeding state; integrating the actual discharge power to obtain the actual discharge energy.

[0011] In a possible implementation of the present application, obtaining the actual discharge power of the braking resistor includes: Among them, P is the actual discharge power, n is the motor speed, I is the motor current, and kT is the motor coefficient.

[0012] In a possible implementation of the present application, a corresponding overload control strategy is determined according to the overload state type, including: determining a preset overload state identifier according to the overload state type, wherein the preset overload state identifier is used to represent pre-set identification information corresponding to the overload state type; based on the preset overload state identifier, determining a corresponding overload control strategy.

[0013] As a second aspect of the present application, the present application also provides a pitch controller for obtaining the actual discharge energy of the braking resistor in response to the wind turbine being in a feeding state, wherein the actual discharge energy is used to characterize the excess energy consumed by the braking resistor from the feeding state; and determining the overload state type of the braking resistor based on the actual discharge energy and the preset overload energy.

[0014] As a third aspect of the present application, the present application further provides a main control controller, which is communicatively connected to the pitch controller, and the main control controller is used to determine a corresponding overload control strategy according to the overload state type.

[0015] As a fourth aspect of the present application, the present application further provides a computer-readable storage medium, the storage medium storing a computer program, and the computer program is used to execute any one of the above-mentioned methods for overload control of a braking resistor.

[0016] The overload control method of the brake resistor provided in the present application obtains the actual discharge energy of the brake resistor in response to the wind turbine being in the energy feeding state, wherein the actual discharge energy is used to characterize the excess energy consumed by the brake resistor from the energy feeding state; determines the overload state type of the brake resistor according to the actual discharge energy and the preset overload energy; and determines the corresponding overload control strategy according to the overload state type. It is easy to notice that by comparing the actual discharge energy of the brake resistor with different preset overload energies to determine the different overload states of the brake resistor, and determining the corresponding overload control strategy based on the different overload states, the purpose of real-time monitoring of the overload state of the brake resistor is achieved, thereby achieving the technical effect of identifying the risk of bad parts in advance to protect the brake resistor, thereby solving the technical problem that the brake resistor can only be identified and passively replaced after it is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1Shown is a flow chart of a brake resistor overload control method provided in one embodiment of the present application.

[0019] Figure 2 Shown is a functional implementation diagram of overload control of a braking resistor provided in an embodiment of the present application.

[0020] Figure 3 Shown is a device block diagram of a main control controller provided in one embodiment of the present application. DETAILED DESCRIPTION

[0021] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0022] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] Exemplary Methods

[0024] As a first aspect of the present application, the present application provides an overload control method for a braking resistor. Figure 1 FIG. 1 is a flow chart of a method for controlling an overload of a brake resistor provided by an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0025] S101, in response to the wind turbine being in a power feeding state, obtaining actual discharge energy of a braking resistor, wherein the actual discharge energy is used to characterize excess energy consumed by the braking resistor in the power feeding state;

[0026] Specifically, "feedback" refers to the process of transmitting electrical energy from power generation equipment (such as wind turbines) to the power grid. The above-mentioned feedback status can be used to indicate the state in which the wind turbine is providing electrical energy to the power grid or external loads.

[0027] Generally, the above energy discharge process can be understood as the process of releasing or consuming the excess power generated by the wind turbine or the power that cannot be absorbed by the power grid. This is an important link in the control of the power system and wind turbines, especially when the power grid cannot accept more power or the power generated by the wind turbine exceeds the power grid demand.

[0028] In a wind turbine, if the excess electric energy generated by the wind turbine cannot be absorbed by the power grid, it is necessary to discharge the electric energy. In this application, the excess electric energy is discharged by using a braking resistor, which is used to convert the excess electric energy in the wind turbine into heat energy, thereby consuming this energy. This is an important measure to protect the wind turbine from damage when the wind speed is too high or the power grid cannot absorb more electric energy. When the output power of the wind turbine exceeds the power grid demand or the wind speed exceeds the safety limit, the excess electric energy is dissipated in the form of heat energy through the braking resistor.

[0029] In an optional embodiment, the present application uses a brake resistor as an end-effector to passively accept the discharge power of excess electric energy. When the discharge power accepted by the brake resistor exceeds the predetermined power, the brake resistor may be overloaded and may be damaged. Therefore, the actual discharge energy (expressed as W) of the brake resistor is monitored in the present application to monitor the working status of the brake resistor in real time.

[0030] S102, determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy;

[0031] Specifically, the above-mentioned preset overload energy can be used to indicate the load energy in different stages that the preset braking resistor can accept.

[0032] For example, it can be the maximum load energy that the braking resistor can accept during the normal working stage, the maximum load energy that the braking resistor can accept when there is an overload trend, or the maximum load energy that the braking resistor can accept when it is in a serious overload state, etc. The preset overload energy is not specifically limited here and can be adjusted according to actual conditions.

[0033] The above-mentioned overload status type can be used to indicate the status type determined based on the degree of overload of the brake resistor.

[0034] In an optional embodiment, after the actual discharge energy of the braking resistor is obtained, the actual discharge energy may be compared with the preset overload energy to determine the overload state type of the braking resistor.

[0035] For example, if the actual discharge energy is less than the maximum load energy that the braking resistor can accept during the normal working stage, it means that the overload state type of the braking resistor corresponds to the normal operation of the braking resistor; if the actual discharge energy is greater than the maximum load energy that the braking resistor can accept during the normal working stage, and less than the maximum load energy that the braking resistor can accept when there is an overload trend, it means that the overload state type of the braking resistor corresponds to the existence of an overload trend of the braking resistor, etc.

[0036] S103: Determine a corresponding overload control strategy according to the overload state type.

[0037] Specifically, the above-mentioned overload control strategy is determined based on the overload state type, and generally, it can be changed with different overload state types.

[0038] Exemplarily, if the overload state type of the braking resistor corresponds to the normal operation of the braking resistor, the corresponding overload control strategy is: no overload control is performed on the braking resistor. Specifically, the various operating parameters of the wind turbine set may be kept unchanged; if the overload state type of the braking resistor corresponds to the existence of an overload trend of the braking resistor, the corresponding overload control strategy is: reducing the rate of reduction of the blade pitch angle of the current wind turbine set, etc.

[0039] Figure 2 FIG. 1 is a functional implementation diagram of the overload control of the brake resistor provided by an embodiment of the present application, as shown in FIG. Figure 2 As shown, the execution body of the functional implementation diagram includes a pitch controller and a main control controller, wherein:

[0040] The pitch controller is responsible for collecting the input status of the brake resistor, and calculating the actual discharge power according to the electrode current and motor speed, and then comparing the brake resistor design parameters to mark the overload status;

[0041] The main controller is connected to the pitch controller for communication and is responsible for taking corresponding pitch control strategies according to the overload status mark.

[0042] The overload control method of the brake resistor provided in the present application obtains the actual discharge energy of the brake resistor in response to the wind turbine being in the energy feeding state, wherein the actual discharge energy is used to characterize the excess energy consumed by the brake resistor from the energy feeding state; determines the overload state type of the brake resistor according to the actual discharge energy and the preset overload energy; and determines the corresponding overload control strategy according to the overload state type. It is easy to notice that by comparing the actual discharge energy of the brake resistor with different preset overload energies to determine the different overload states of the brake resistor, and determining the corresponding overload control strategy based on the different overload states, the purpose of real-time monitoring of the overload state of the brake resistor is achieved, thereby achieving the technical effect of identifying the risk of bad parts in advance to protect the brake resistor, thereby solving the technical problem that the brake resistor can only be identified and passively replaced after it is damaged.

[0043] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is less than the first preset overload energy, the overload state type of the braking resistor is determined to be a first overload state, wherein the first preset overload energy is the product of a first preset overload coefficient and the first preset energy of the braking resistor; and the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the first overload state as: controlling the blade pitch angle of the current wind turbine to remain unchanged.

[0044] Specifically, the first preset overload energy can be used to represent the load energy that the preset braking resistor can accept in the first stage. Exemplarily, the first stage can be represented as a normal working stage.

[0045] The first preset overload coefficient mentioned above can be used to represent the overload coefficient corresponding to the preset braking resistor in the first stage, which can be expressed as T1.

[0046] The first preset energy mentioned above can be used to represent the design energy corresponding to the preset braking resistor in the first stage, which can be expressed as Wt1.

[0047] In an optional embodiment, if the actual discharge energy is less than the first preset overload energy, that is, W<T1*Wt1, the overload state type of the braking resistor is determined to be the first overload state, and the first overload state can be represented as the normal operation of the braking resistor. The overload control strategy corresponding to the first overload state is: controlling the blade pitch angle of the current wind turbine to remain unchanged.

[0048] The first overload state is indicated as the normal operation of the brake resistor, which means that the brake resistor is not overloaded at present, so the brake resistor needs to be kept in normal operation. Generally, the main function of the variable pitch controller is to adjust the pitch angle of the wind turbine blades, that is, the angle of attack of the blades relative to the wind direction. Since the brake resistor is not overloaded at present, it means that the wind turbine maintains the normal energy feeding state at this time, and there is no need to control the variable pitch controller to adjust the pitch angle of the wind turbine blades, that is, the overload control strategy corresponding to the first overload state is: control the blade pitch angle of the current wind turbine to remain unchanged.

[0049] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the first preset overload energy and less than the second preset overload energy, the overload state type of the braking resistor is determined to be the second overload state, wherein the second preset overload energy is the product of the second preset overload coefficient and the second preset energy of the braking resistor, wherein the second preset overload coefficient is greater than the first preset overload coefficient, and the second preset energy is greater than the first preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the second overload state as: reducing the reduction rate of the blade pitch angle of the current wind turbine.

[0050] Specifically, the second preset overload energy can be used to represent the load energy that the preset brake resistor can accept in the second stage. Exemplarily, the second stage can be represented as a stage where the brake resistor has an overload tendency.

[0051] The second preset overload coefficient mentioned above can be used to represent the overload coefficient corresponding to the preset braking resistor in the second stage, which can be expressed as T2.

[0052] The second preset energy mentioned above can be used to represent the design energy corresponding to the preset braking resistor in the second stage, which can be expressed as Wt2.

[0053] In an optional embodiment, if the actual discharge energy is greater than the first preset overload energy and less than the second preset overload energy, that is, T1*Wt1<W<T2*Wt2, the overload state type of the braking resistor is determined to be the second overload state, and the second overload state can be expressed as the existence of an overload trend in the braking resistor. The overload control strategy corresponding to the second overload state is: reduce the reduction rate of the blade pitch angle of the current wind turbine.

[0054] The above-mentioned second overload state indicates that the braking resistor has an overload trend, which means that the current braking resistor is overloaded, but the degree is relatively shallow, so it is necessary to reduce the rate of reduction of the blade pitch angle of the current wind turbine. Generally, if the braking resistor is currently overloaded, it means that there is excess energy when the wind turbine maintains the energy feeding state, and this excess energy exceeds the first preset overload energy, but does not exceed the second preset overload energy. Therefore, it is necessary to discharge this excess energy, that is, to control the generation of excess electrical energy in the energy feeding state from the source, that is, the overload control strategy corresponding to the second overload state is: reduce the rate of reduction of the blade pitch angle of the current wind turbine.

[0055] Among them, pitch reduction refers to reducing the pitch angle of the blades, which is usually performed when the wind speed is too high to reduce the speed of the wind rotor and the power output of the generator to prevent the unit from overspeeding or overloading. In the pitch reduction operation, acceleration refers to the speed at which the blade pitch angle decreases. Pitch reduction acceleration specifically refers to the rate at which the blade pitch angle decreases during the pitch reduction operation, which is an important control parameter. Controlling the pitch reduction acceleration can ensure the stability and response speed of the wind turbine when adjusting the blade angle, and avoid mechanical shock or instability of the control system caused by too fast changes in the blade angle.

[0056] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the second preset overload energy and less than the third preset overload energy, the overload state type of the braking resistor is determined to be the third overload state, wherein the third preset overload energy is the product of a third preset overload coefficient and the third preset energy of the braking resistor, wherein the third preset overload coefficient is greater than the second preset overload coefficient, and the third preset energy is greater than the second preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the third overload state as: synchronously reducing the pitch angles of all blades of the current wind turbine set.

[0057] Specifically, the third preset overload energy can be used to indicate the load energy that the preset brake resistor can accept in the third stage. Exemplarily, the third stage can be indicated as a stage corresponding to a deeper overload state of the brake resistor.

[0058] The third preset overload coefficient mentioned above can be used to represent the overload coefficient corresponding to the preset braking resistor in the third stage, which can be expressed as T3.

[0059] The third preset energy mentioned above can be used to represent the design energy corresponding to the preset braking resistor in the third stage, which can be expressed as Wt3.

[0060] In an optional embodiment, if the actual discharge energy is greater than the second preset overload energy and less than the third preset overload energy, that is, T2*Wt2<W<T3*Wt3, the overload state type of the braking resistor is determined to be the third overload state, and the third overload state can be expressed as a deeper overload state of the braking resistor. The overload control strategy corresponding to the third overload state is: synchronously reduce the pitch angles of all blades of the current wind turbine.

[0061] The third overload state is indicated by a deeper overload state of the braking resistor, indicating that the braking resistor is currently overloaded and the degree is deep, so it is necessary to synchronously reduce the pitch angles of all blades of the current wind turbine. Generally, if the braking resistor is currently overloaded, it means that there is excess energy when the wind turbine maintains the feeding state, and this excess energy exceeds the second preset overload energy, but does not exceed the third preset overload energy. Therefore, it is necessary to discharge this excess energy, that is, to control the generation of excess electrical energy in the feeding state from the source, that is, the overload control strategy corresponding to the third overload state is: synchronously reduce the pitch angles of all blades of the current wind turbine.

[0062] Among them, synchronous pitch control in wind turbines refers to adjusting the pitch angles of all blades to the same degree at the same time during the operation of the wind turbine. The purpose of this control method is to uniformly control the aerodynamic characteristics of the entire wind rotor to achieve precise control of the power output and speed of the wind turbine. When the wind speed approaches or exceeds the rated wind speed, the wind rotor's wind-catching area is reduced by reducing the pitch angle, limiting the power output of the wind turbine to prevent it from exceeding the design limit.

[0063] In a possible implementation of the present application, the overload state type of the braking resistor is determined according to the actual discharge energy and the preset overload energy, including: when the actual discharge energy is greater than the third preset overload energy and less than the fourth preset overload energy, the overload state type of the braking resistor is determined to be a fourth overload state, wherein the fourth preset overload energy is the product of a fourth preset overload coefficient and a fourth preset energy of the braking resistor, wherein the fourth preset overload coefficient is greater than the third preset overload coefficient, and the fourth preset energy is greater than the third preset energy; the corresponding overload control strategy is determined according to the overload state type, including: determining the overload control strategy according to the fourth overload state as: limiting the output power of the generator in the wind turbine.

[0064] Specifically, the fourth preset overload energy mentioned above can be used to represent the load energy that the preset brake resistor can accept in the fourth stage. Exemplarily, the fourth stage can be represented as a stage corresponding to the saturation of the overload state of the brake resistor.

[0065] The fourth preset overload coefficient mentioned above can be used to represent the overload coefficient corresponding to the preset braking resistor in the fourth stage, which can be expressed as T4.

[0066] The fourth preset energy mentioned above can be used to represent the design energy corresponding to the preset braking resistor in the fourth stage, which can be expressed as Wt4.

[0067] In an optional embodiment, if the actual discharge energy is greater than the third preset overload energy and less than the fourth preset overload energy, that is, T3*Wt3<W<T4*Wt4, the overload state type of the braking resistor is determined to be the fourth overload state, and the fourth overload state can be expressed as the overload state saturation of the braking resistor. The overload control strategy corresponding to the fourth overload state is: limiting the output power of the generator in the wind turbine.

[0068] The fourth overload state is represented by the saturation of the overload state of the brake resistor, indicating that the brake resistor is currently in overload operation and the degree is saturated, so the output power of the generator in the wind turbine needs to be limited. Generally, if the current overload operation state of the brake resistor is saturated, it means that there is excess energy when the wind turbine maintains the energy feeding state at this time, and this excess energy exceeds the third preset overload energy, but does not exceed the fourth preset overload energy. Therefore, it is necessary to discharge this excess energy, that is, to control the generation of excess electric energy in the energy feeding state from the source, that is, the overload control strategy corresponding to the fourth overload state is: limit the output power of the generator in the wind turbine.

[0069] Among them, the power-limited operation of wind turbines means that under certain wind speed conditions, the control system of the wind turbine will limit its output power to protect the equipment from damage and ensure safe operation. Wind turbines usually have a rated wind speed, which is the maximum continuous wind speed allowed by the design. If the wind speed exceeds this, the wind turbine needs to take measures to limit the power output to avoid overloading the mechanical components.

[0070] In a possible implementation of the present application, obtaining the actual discharge energy of the braking resistor includes: obtaining the actual discharge power of the braking resistor, the actual discharge power is used to characterize the excess power consumed by the braking resistor from the energy feeding state; integrating the actual discharge power to obtain the actual discharge energy.

[0071] Specifically, in the process of obtaining the actual discharge energy of the braking resistor, it is necessary to monitor the bus voltage, motor current, and motor speed through the pitch controller, and calculate the short-term and continuous discharge energy after the braking resistor is put into use to obtain the above-mentioned actual discharge power, and then integrate the actual discharge power to obtain the above-mentioned actual discharge energy.

[0072] It should be noted that since the energy feeding state of the wind turbine may be the electric energy output in a continuous state or the electric energy output in a discontinuous state, when the electric energy is output in a continuous state, the actual discharge energy can be directly calculated based on the output electric energy; conversely, when the electric energy is output in a discontinuous state, the energy of each intermittent time period can be accumulated and calculated to obtain the final actual discharge energy.

[0073] In a possible implementation of the present application, obtaining the actual discharge power of the braking resistor includes: Among them, P is the actual discharge power, n is the motor speed, I is the motor current, and kT is the motor coefficient.

[0074] Specifically, in the process of obtaining the actual discharge power of the brake resistor, it can be calculated using the following formula: Among them, P is used to represent the actual discharge power, n is used to represent the motor speed, I is used to represent the motor current, and kT is used to represent the motor coefficient.

[0075] In a possible implementation of the present application, a corresponding overload control strategy is determined according to the overload state type, including: determining a preset overload state identifier according to the overload state type, wherein the preset overload state identifier is used to represent pre-set identification information corresponding to the overload state type; based on the preset overload state identifier, determining a corresponding overload control strategy.

[0076] Specifically, the above-mentioned preset overload status identifier can be a pre-set digital identifier corresponding to the overload status type, or a letter identifier corresponding to the overload status type, etc. The preset overload status identifier is not specifically limited here and can be adjusted according to actual conditions. However, it is necessary to set corresponding identification information based on different overload status types, and these flag information need to be distinguished and recorded.

[0077] In an optional embodiment, in the process of determining the corresponding overload control strategy according to the overload state type, the identification information corresponding to the overload state type can be first set according to the overload state type, that is, a preset overload state identification is determined, and then based on the preset overload state identification, the corresponding overload control strategy is determined. In this way, by setting the preset overload state identification, the overload control strategy of the braking resistor is simplified, thereby improving the overload control efficiency of the braking resistor.

[0078] Table 1 Braking resistor overload status identification-control strategy association table

[0079] Overload status Overload status indicator Control strategy IN <T1*Wt1 1 Normal operation T1*Wt1<W<T2*Wt2 2 Reduce pitch acceleration <h2 style=";text-align:left;direction:ltr">T2*Wt2 <W<T3*Wt3 <h2 style=";text-align:left;direction:ltr"> 3 Synchronous Pitch <h2 style=";text-align:left;direction:ltr">T3*Wt3 <W<T4*Wt4 <h2 style=";text-align:left;direction:ltr"> 4 Power-limited operation

[0080] Exemplarily, as shown in Table 1, when W < T1 * Wt1, it can be determined that the overload status identifier of the braking resistor at this time is 1, and the corresponding control strategy is: controlling the normal operation of the wind turbine;

[0081] When T1 * Wt1 < W < T2 * Wt2, it can be determined that the overload status identifier of the braking resistor at this time is 2, and the corresponding control strategy is: reducing the pitch acceleration, that is, reducing the reduction rate of the blade pitch angle of the current wind turbine;

[0082] When T2 * Wt2 < W < T3 * Wt3, it can be determined that the overload status identifier of the braking resistor at this time is 3, and the corresponding control strategy is: synchronous pitching, that is, synchronously reducing the pitch angles of all the blades of the current wind turbine;

[0083] When T3 * Wt3 < W < T4 * Wt4, it can be determined that the overload status identifier of the braking resistor at this time is 4, and the corresponding control strategy is: power-limited operation, that is, limiting the output power of the generator in the wind turbine.

[0084] Exemplary Pitch Controller

[0085] As a second aspect of the present application, the present application also provides a pitch controller. The pitch controller can perform the following steps:

[0086] S1. In response to the wind turbine being in the energy feeding state, obtaining the actual discharge energy of the braking resistor, where the actual discharge energy is used to characterize the excess energy consumed by the braking resistor from the energy feeding state;

[0087] S2. Determining the overload status type of the braking resistor according to the actual discharge energy and the preset overload energy.

[0088] Exemplary Master Controller

[0089] As a third aspect of the present application, the present application also provides a main control controller. The main control controller is communicatively connected to the pitch controller, and the main control controller is used to determine the corresponding overload control strategy according to the overload status type.

[0090] Figure 3 The device block diagram of the main control controller provided by an embodiment of the present application is shown.

[0091] As Figure 3 shown, the main control controller includes one or more processors 31 and a memory 32.

[0092] The processor 31 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the main control controller to perform the desired functions.

[0093] The memory 32 may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 31 may run the program instructions to implement the above-mentioned braking resistor overload control method of each embodiment of the present application and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0094] In one example, the main controller may further include: an input device 33 and an output device 34, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0095] When the main controller is a stand-alone device, the input device 33 may be a communication network connector for receiving collected input signals from the first device and the second device.

[0096] In addition, the input device 33 may also include, for example, a keyboard, a mouse, and the like.

[0097] The output device 34 can output various information to the outside, including the determined distance information, direction information, etc. The output device 34 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0098] Of course, to simplify, Figure 3 Only some of the components in the main control controller related to the present application are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the main control controller may also include any other appropriate components according to specific application conditions.

[0099] Exemplary computer-readable storage media

[0100] As a fourth aspect of the present application, the present application provides a computer-readable storage medium, the storage medium storing a computer program, and the computer program is used to perform the following steps:

[0101] S1, in response to the wind turbine being in a power feeding state, obtaining actual discharge energy of the braking resistor, wherein the actual discharge energy is used to characterize excess energy consumed by the braking resistor in the power feeding state;

[0102] S2, determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy;

[0103] S3: Determine a corresponding overload control strategy according to the overload state type.

[0104] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program information. When the computer program information is executed by a processor, the processor executes the steps of the overload control method of the braking resistor according to various embodiments of the present application described in this specification.

[0105] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0106] In addition, an embodiment of the present application may also be a computer-readable storage medium on which computer program information is stored. When the computer program information is executed by a processor, the processor executes the steps of the method for overload control of a braking resistor according to various embodiments of the present application described in this specification.

[0107] Computer readable storage media can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0108] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0109] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0110] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

Claims

1. A method for controlling an overload of a braking resistor, characterized in that: include: In response to the wind turbine being in a power feeding state, obtaining actual discharge energy of the braking resistor, wherein the actual discharge energy is used to characterize excess energy consumed by the braking resistor in the power feeding state; Determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy; A corresponding overload control strategy is determined according to the overload state type.

2. The overload control method of the brake resistor according to claim 1, characterized in that: Determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy includes: When the actual discharge energy is less than the first preset overload energy, determining that the overload state type of the braking resistor is a first overload state, wherein the first preset overload energy is the product of a first preset overload coefficient and the first preset energy of the braking resistor; Determining a corresponding overload control strategy according to the overload state type includes: The overload control strategy determined according to the first overload state is: controlling the blade pitch angle of the current wind turbine generator set to remain unchanged.

3. The overload control method of the brake resistor according to claim 2, characterized in that: Determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy includes: When the actual discharge energy is greater than the first preset overload energy and less than the second preset overload energy, the overload state type of the braking resistor is determined to be the second overload state, wherein the second preset overload energy is the product of a second preset overload coefficient and a second preset energy of the braking resistor, wherein the second preset overload coefficient is greater than the first preset overload coefficient, and the second preset energy is greater than the first preset energy; Determining a corresponding overload control strategy according to the overload state type includes: The overload control strategy determined according to the second overload state is: reducing the rate of decrease of the blade pitch angle of the current wind turbine generator set.

4. The overload control method of the brake resistor according to claim 3, characterized in that: Determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy includes: When the actual discharge energy is greater than the second preset overload energy and less than the third preset overload energy, the overload state type of the braking resistor is determined to be the third overload state, wherein the third preset overload energy is the product of a third preset overload coefficient and a third preset energy of the braking resistor, wherein the third preset overload coefficient is greater than the second preset overload coefficient, and the third preset energy is greater than the second preset energy; Determining a corresponding overload control strategy according to the overload state type includes: The overload control strategy determined according to the third overload state is: synchronously reducing the pitch angles of all blades of the current wind turbine generator set.

5. The overload control method of the brake resistor according to claim 4, characterized in that: Determining the overload state type of the braking resistor according to the actual discharge energy and the preset overload energy includes: When the actual discharge energy is greater than the third preset overload energy and less than the fourth preset overload energy, the overload state type of the braking resistor is determined to be a fourth overload state, wherein the fourth preset overload energy is the product of a fourth preset overload coefficient and a fourth preset energy of the braking resistor, wherein the fourth preset overload coefficient is greater than the third preset overload coefficient, and the fourth preset energy is greater than the third preset energy; Determining a corresponding overload control strategy according to the overload state type includes: The overload control strategy determined according to the fourth overload state is: limiting the output power of the generator in the wind turbine.

6. The overload control method of the brake resistor according to claim 1, characterized in that: Obtain the actual discharge energy of the brake resistor, including: Acquire the actual discharge power of the braking resistor, where the actual discharge power is used to characterize the excess power consumed by the braking resistor in the energy feeding state; An integration operation is performed on the actual discharge power to obtain the actual discharge energy.

7. The overload control method of the braking resistor according to claim 6, characterized in that: Get the actual discharge power of the brake resistor, including: Among them, P is the actual discharge power, n is the motor speed, I is the motor current, and kT is the motor coefficient.

8. The overload control method of the brake resistor according to claim 1, characterized in that: Determining a corresponding overload control strategy according to the overload state type includes: Determining a preset overload state identifier according to the overload state type, wherein the preset overload state identifier is used to represent preset identifier information corresponding to the overload state type; Based on the preset overload status identifier, a corresponding overload control strategy is determined.

9. A pitch controller, characterized in that: The pitch controller is used to obtain the actual discharge energy of the braking resistor in response to the wind turbine being in a feeding state, wherein the actual discharge energy is used to characterize the excess energy consumed by the braking resistor from the feeding state; and determine the overload state type of the braking resistor based on the actual discharge energy and a preset overload energy.

10. A master controller, characterized in that: The main control controller is in communication connection with the pitch controller described in claim 9, and the main control controller is used to determine a corresponding overload control strategy according to the overload state type.

Images