CN114665761A - Wind power yaw brake resistor overheating protection control method, circuit, device and equipment - Google Patents
Wind power yaw brake resistor overheating protection control method, circuit, device and equipment Download PDFInfo
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- CN114665761A CN114665761A CN202210542931.9A CN202210542931A CN114665761A CN 114665761 A CN114665761 A CN 114665761A CN 202210542931 A CN202210542931 A CN 202210542931A CN 114665761 A CN114665761 A CN 114665761A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/107—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of overloads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/42—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to product of voltage and current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a wind power yaw brake resistor overheating protection control method, a circuit, a device and equipment, wherein the method comprises the following steps: monitoring the braking power of the braking resistor in real time to obtain the real-time braking power of the braking resistor; comparing the brake rated power in the preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to the comparison result; calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient; judging whether the heat accumulation coefficient of the brake resistor is larger than a preset accumulation coefficient threshold value or not; and if the heat accumulation coefficient of the braking resistor is greater than the accumulation coefficient threshold value, sending a stop signal to stop the operation of the braking resistor. By the method, the accumulation coefficient of the brake resistor can be calculated, whether a stop signal is sent to stop the brake resistor to work is judged based on the accumulation coefficient threshold, extra hardware cost is not required to be added, and low-cost overload control on the brake resistor is achieved.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a wind power yaw brake resistor overheating protection control method, circuit, device and equipment.
Background
The motor driver can be applied to wind control of the wind power generation engine room angle, when the rotating speed of a rotor of the yaw motor is larger than the synchronous rotating speed of a stator, energy can be generated to reversely flow into bus voltage, generally, a brake resistor can be adopted as an energy consumption unit to consume and release the energy, otherwise, the bus voltage is continuously increased to cause bus overvoltage, and devices such as a bus capacitor, a switching power supply and an IGBT (insulated gate bipolar translator) in the motor driver are subjected to overhigh voltage to fail. The braking resistor performs chopping on the bus to release bus energy through an IGBT (insulated gate bipolar transistor) and a freewheeling diode of the braking unit, but generally the braking resistor is selected to depend on empirical parameters such as inertia, time, braking frequency and the like of a field load, so that the situation that the braking resistor works in an overload mode exists, particularly in wind power yaw application, because the fan head has large inertia, the wind speed shear is complex and the like, the designed and selected braking resistor has the possibility of overload under special working conditions. In the traditional technical method, in order to avoid overload of the brake resistor, a temperature sensor assembly is usually additionally arranged on the brake resistor, but the method has complex wiring and increases hardware cost and later maintenance cost. Therefore, the problem that overload control cannot be performed at low cost exists in the brake resistor applied to wind power yaw overload in the prior art method.
Disclosure of Invention
The embodiment of the invention provides a wind power yaw brake resistor overheating protection control method, a circuit, a device and equipment, and aims to solve the problem that overload control cannot be performed at low cost in a brake resistor applied to wind power yaw overload in the prior art.
In a first aspect, an embodiment of the present invention provides a wind power yaw brake resistor overheating protection control method, where the method includes:
monitoring the braking power of a braking resistor in real time to obtain the real-time braking power of the braking resistor;
comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to a comparison result;
calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient;
judging whether the heat accumulation coefficient of the braking resistance is larger than a preset accumulation coefficient threshold value or not;
and if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor.
In a second aspect, the embodiment of the invention provides a wind power yaw brake resistor overheating protection control circuit, which comprises a bus, a drive controller, a diode, a brake resistor and an IGBT (insulated gate bipolar transistor);
a first voltage input end of the driving controller is connected with a positive end of the bus, a second voltage input end of the driving controller is connected with a negative end of the bus, and a control signal output end of the driving controller is connected with a grid electrode of the IGBT;
a collector of the IGBT bipolar transistor is connected with one end of the resistor and the anode of the diode, and the other end of the resistor and the cathode of the diode are both connected with the anode end of the bus; the emitting electrode of the IGBT bipolar transistor is connected with the negative end of the bus;
the drive controller applies the wind power yaw brake resistance overheat protection control method according to the first aspect.
In a third aspect, an embodiment of the present invention provides a wind power yaw brake resistor overheat protection control device, where the device includes:
the real-time braking power monitoring unit is used for monitoring the braking power of the braking resistor in real time so as to obtain the real-time braking power of the braking resistor;
the brake accumulation time acquisition unit is used for comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power and acquiring brake accumulation time according to a comparison result;
the braking resistance heat accumulation coefficient acquisition unit is used for calculating the braking accumulation time according to a preset braking resistance heat accumulation formula to obtain a corresponding braking resistance heat accumulation coefficient;
the brake resistance heat accumulation coefficient judging unit is used for judging whether the brake resistance heat accumulation coefficient is larger than a preset accumulation coefficient threshold value or not;
and the stop signal sending unit is used for sending a stop signal to stop the brake resistor if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value.
In a fourth aspect, an embodiment of the present invention further provides wind power yaw brake resistor overheating protection control equipment, which is configured in a drive controller of a wind power yaw brake resistor overheating protection control circuit, and the equipment includes a memory, a processor, a voltage measurer, a control signal output end, and a computer program that is stored in the memory and is executable on the processor, where the processor implements the wind power yaw brake resistor overheating protection control method according to the first aspect when executing the computer program.
The embodiment of the invention provides a wind power yaw brake resistor overheating protection control method, a circuit, a device and equipment, wherein the method comprises the following steps: monitoring the braking power of a braking resistor in real time to obtain the real-time braking power of the braking resistor; comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to a comparison result; calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient; judging whether the heat accumulation coefficient of the braking resistance is larger than a preset accumulation coefficient threshold value or not; and if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor. By the method, the brake resistance accumulation coefficient can be calculated, whether a stop signal is sent to stop the brake resistance to work is judged based on the accumulation coefficient threshold, extra hardware cost is not required to be added, and low-cost overload control on the brake resistance is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a wind power yaw brake resistor overheating protection control method according to an embodiment of the present invention;
FIG. 2 is a schematic sub-flow diagram of a wind power yaw brake resistance overheat protection control method according to an embodiment of the present invention;
FIG. 3 is another schematic sub-flow diagram of a wind power yaw brake resistance overheat protection control method according to an embodiment of the present invention;
FIG. 4 is a schematic view of another sub-flow of a wind power yaw braking resistance overheating protection control method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the latter sub-flow of the wind power yaw braking resistance overheating protection control method according to the embodiment of the present invention;
fig. 6 is another schematic flow chart of a wind power yaw brake resistance overheat protection control method according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a wind power yaw brake resistance overheat protection control method according to an embodiment of the present invention;
fig. 8 is a circuit structure diagram of a wind power yaw brake resistance overheat protection control circuit according to an embodiment of the present invention;
FIG. 9 is a schematic block diagram of a wind power yaw brake resistance overheat protection control device provided by an embodiment of the invention;
fig. 10 is a schematic block diagram of a wind power yaw brake resistance overheat protection control device provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic flow chart of a wind power yaw brake resistor overheating protection control method according to an embodiment of the present invention; the wind power yaw brake resistor overheating protection control method is applied to a drive controller and is executed through application software in the drive controller; the driving controller can be used for executing a wind power yaw brake resistance overheating protection control method to control the brake resistance arranged in the wind power yaw brake resistance overheating protection control circuit, and the wind power yaw brake resistance overheating protection control circuit can be configured in the wind power generation equipment. As shown in FIG. 1, the method includes steps S110 to S150.
S110, monitoring the braking power of the braking resistor in real time to obtain the real-time braking power of the braking resistor.
The drive controller can monitor the braking power of the braking resistor in real time, and specifically, the drive controller can acquire the bus voltage U through the voltage values of the first voltage input end and the second voltage input enddcCalculating to obtain corresponding braking power based on the resistance R of the braking resistor, and then obtaining the braking power Pact=Udc 2and/R. System for makingThe resistance R of the dynamic resistor is constant and known, and the bus voltage U is obtained in real timedcThe real-time monitoring of the braking power of the braking resistor can be realized, and the bus voltage U obtained in real time is useddcAnd calculating the resistance value R of the brake resistor to obtain the real-time brake power.
S120, comparing the brake rated power in the preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to the comparison result.
The driving controller is pre-configured with a brake time accumulation rule, and can compare the brake rated power with the real-time brake power according to the brake time accumulation rule and acquire the brake accumulation time according to the comparison result. The brake accumulation time can be used for carrying out quantitative representation on the degree of the brake resistance exceeding the brake rated power.
In an embodiment, as shown in fig. 2, step S120 includes sub-steps S121, S122, S123 and S124.
S121, judging whether the real-time braking power is larger than the braking rated power; and S122, if the real-time braking power is greater than the braking rated power, increasing the monitoring time period of the real-time braking power over the pre-stored historical braking accumulated time to obtain updated braking accumulated time.
Whether the real-time braking power is larger than the braking rated power or not can be judged, if so, the monitoring time period of the real-time braking power is increased on the pre-stored historical braking accumulation time, and therefore the updated braking accumulation time is obtained. Specifically, each real-time braking power corresponds to a fixed monitoring time period, and if the monitoring time period is 0.02S, the braking power is considered to be kept unchanged within 0.02S after one real-time braking power is obtained. The historical brake accumulation time is brake accumulation time accumulated before the current real-time brake power is obtained, and if the current real-time brake power is the first real-time brake power obtained by starting the machine at this time, the historical brake accumulation time is zero. A monitoring time period may be added to the pre-stored historical brake accumulation time to obtain an updated brake accumulation time.
For example, the historical brake accumulation time is 0.5S, and after a monitoring time period of 0.02S is added, the updated brake accumulation time is 0.52S.
And S123, if the real-time braking power is smaller than the braking rated power, subtracting the monitoring time period of the real-time braking power from the pre-stored historical braking accumulated time to obtain updated braking accumulated time.
If the real-time braking power is smaller than the braking rated power, subtracting a monitoring time period on the basis of the historical braking accumulated time so as to obtain updated braking accumulated time.
For example, the historical brake accumulation time is 0.5S, and after subtracting a monitoring time period of 0.02S, the updated brake accumulation time is 0.48S.
And S124, if the real-time braking power is equal to the braking rated power, taking the pre-stored historical braking accumulated time as the corresponding braking accumulated time in the monitoring time period when the real-time braking power is equal to the braking rated power.
If the real-time braking power is equal to the braking rated power, the historical braking accumulated time does not need to be changed, and the historical braking accumulated time is directly used as the updated braking accumulated time.
In an embodiment, as shown in fig. 3, step S120 includes sub-steps S1201, S1202, S1203, S1204, S1205, and S1206.
In the above embodiment, each time a real-time braking power is obtained, the braking accumulation time needs to be updated once, and in order to avoid too frequent updating of the braking accumulation time, the method in the embodiment may be used to obtain the corresponding braking accumulation time, so as to reduce the operation load of the drive controller.
S1201, judging whether the real-time braking power is larger than the braking rated power or not to obtain a current power judgment state; and S1202, judging whether the current power judging state is the same as the previous power judging state.
The method can judge whether the real-time braking power is greater than the braking rated power so as to obtain a current power judging state, wherein the current power judging state can be greater than, less than or equal to, and further judge whether the current power judging state is the same as a previous power judging state, namely the power judging state obtained in a monitoring time period before the current power judging state.
And S1203, if the current power judgment state is the same as the previous power judgment state, performing accumulation calculation according to the state duration of the current power judgment state to obtain state accumulation time.
If the current power determination state is the same as the previous power determination state, performing accumulation calculation according to the state duration of the current power determination state to obtain state accumulation time, if the current power determination state is greater than the previous power determination state, and the previous power determination state is also greater than the previous power determination state, the power determination state which is the same as the current power determination state lasts for five monitoring time periods, and obtaining five monitoring time periods as the state duration of the current power determination state, and performing accumulation calculation to obtain the corresponding state accumulation time of 0.1S.
S1204, judging whether the state accumulation time exceeds a preset time length threshold value; and S1205, if the state accumulation time exceeds the duration threshold or the current power judgment state is different from the previous power judgment state, updating the pre-stored historical brake accumulation time according to the stored state accumulation time to obtain the updated brake accumulation time.
And if the state accumulation time exceeds the duration threshold or the current power judgment state is different from the previous power judgment state, updating the historical brake accumulation time according to the stored state accumulation time so as to obtain the updated brake accumulation time. If the state accumulation time does not exceed the time length threshold value, the current power judgment state can be used as the previous power judgment state, the next real-time braking power is continuously obtained, and the step S1201 is executed.
If the duration threshold can be set to 0.2S and the state accumulation time is 0.22S, the duration threshold has been exceeded. If the current power determination state is less than the predetermined power determination state, the state accumulation time may be subtracted from the historical brake accumulation time to obtain an updated brake accumulation time.
If the current power determination state is different from the previous power determination state, the state accumulation time is 0.12S, and the previous power determination state is greater than the previous power determination state, the state accumulation time can be accumulated on the basis of the historical brake accumulation time to obtain the updated brake accumulation time.
And S1206, carrying out accumulation calculation again on the state accumulation time according to the current power judgment state after clearing the state accumulation time.
And clearing the state accumulation time, and performing the re-accumulation calculation on the state accumulation time according to the monitoring time period of the current power judgment state, namely returning to execute the step S1201.
For example, if the monitoring time period is 0.02S, the state accumulation time is cleared, and then the monitoring time period 0.02S is accumulated to the state accumulation time and the accumulation calculation is performed again.
Based on the above steps S1201-S1206, frequent updating of the state accumulation time can be avoided, and the state accumulation time is updated only once when the state accumulation time exceeds the duration threshold or the current power determination state is different from the previous power determination state, so that the operation load of the drive controller can be greatly reduced.
In one embodiment, as shown in FIG. 4, step S120 includes substeps S1211 and S1212.
S1211, comparing the real-time braking power with the braking rated power to obtain a power difference value; and S1212, multiplying the power difference value by the monitoring time period of the real-time braking power, and adding the multiplied power difference value to the prestored historical braking accumulated time to obtain updated braking accumulated time.
The real-time braking power and the braking rated power can be compared and subtracted to obtain a power difference value, the power difference value is multiplied by the monitoring time period of the real-time braking power, the multiplication result is added with the pre-stored historical braking accumulation time, and therefore the braking accumulation time is updated, wherein the power difference value can be a positive number, a negative number or zero. In the embodiment, not only the time that the brake resistance exceeds the brake rated power is accumulated, but also the amplitude that the brake resistance exceeds the brake rated power is combined, so that the accuracy of the overheat protection control on the brake resistance is further improved.
For example, the power difference value between the real-time braking power and the braking rated power is-5W, the monitoring time period is 0.02S, the product value obtained by multiplying is-0.1, and the-0.1 is added with the prestored historical braking accumulation time, so that the updated braking accumulation time is obtained.
And S130, calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient.
The drive controller is also pre-configured with a brake resistance heat accumulation formula, and the brake accumulation time can be input into the brake resistance heat accumulation formula, so that the corresponding brake resistance heat accumulation coefficient can be obtained through calculation.
In one embodiment, as shown in fig. 5, step S130 includes sub-steps S131 and S132.
S131, calculating the ratio of the brake accumulation time to the brake resistance thermal time constant
。
The brake accumulation time can be divided by the brake resistance thermal time constant to calculate the ratio
The brake resistance thermal time constant is a characteristic constant corresponding to the brake resistance.
S132, according to the heat accumulation formula of the braking resistance
And calculating to obtain the corresponding heat accumulation coefficient of the brake resistor.
And substituting the calculated ratio into a brake resistance heat accumulation formula to calculate a corresponding brake resistance heat accumulation coefficient, wherein the value range of eta is (— ∞, 1).
In an embodiment, as shown in fig. 6, step S1301 is further included before step S130.
S1301, obtaining the continuous power of the brake resistor and the single pulse energy of the brake resistor to calculate and obtain a brake resistor thermal time constant corresponding to the brake resistor.
Before calculating the heat accumulation coefficient of the brake resistor, the corresponding heat time constant of the brake resistor can be calculated according to the continuous power of the brake resistor and the single pulse energy of the brake resistor. Specifically, the thermal time constant of the braking resistor can be calculated by dividing the continuous power by the single pulse energy of the braking resistor. The continuous power and the single pulse energy are basic characteristic constants of the brake resistor and can be obtained based on specification parameters of the brake resistor.
And S140, judging whether the heat accumulation coefficient of the braking resistance is greater than a preset accumulation coefficient threshold value.
S150, if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor.
The brake resistor heat accumulation coefficient can be judged whether to be larger than the accumulation coefficient threshold value or not, if so, the brake resistor is indicated to be seriously overheated, and the drive controller can send a stop signal to stop the brake resistor to work in order to avoid damaging circuit components. If the braking power is not larger than the accumulative coefficient threshold value, the step S110 is executed to continue to monitor the braking power of the overheating resistor in real time.
If the accumulative coefficient threshold value can be set to be 0.98, if the heat accumulative coefficient of the brake resistor is judged to be larger than the accumulative coefficient threshold value, a stop signal is automatically sent out to stop the brake resistor.
In an embodiment, as shown in fig. 7, step S150 is followed by steps S160, S130, S170 and S180.
And S160, setting the real-time braking power to be zero and acquiring the braking accumulated time corresponding to the real-time braking power according to the braking time accumulated rule.
After the stop signal is sent, if the voltage at the two ends of the braking resistor is zero, the real-time braking power can be set to be zero, and the braking accumulated time corresponding to the current real-time braking power is obtained according to the braking time accumulated rule, that is, the step corresponding to the step S120 is executed again.
S130, calculating the brake accumulation time according to the brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient; s170, judging whether the heat accumulation coefficient of the braking resistance is smaller than a preset reset coefficient threshold value.
And continuing to execute the step S130, wherein the heat accumulation coefficient of the brake resistance is smaller than the accumulation coefficient threshold value, the step S140 is not required to be executed under the condition that the brake resistance stops working, the step S170 can be further executed after the step S130 is executed, whether the heat accumulation coefficient of the brake resistance is smaller than the preset reset coefficient threshold value or not is judged, and whether the brake resistance can restore to work or not can be judged through the reset coefficient threshold value.
And S180, if the heat accumulation coefficient of the brake resistor is smaller than the reset coefficient threshold value, sending a reset signal to enable the brake resistor to recover the brake work.
If the heat accumulation coefficient of the brake resistor is smaller than the reset coefficient threshold value, the drive controller can send a reset signal to enable the brake resistor to recover the brake work, and after the brake resistor recovers, the step S110 can be returned to be executed to continue to monitor the brake power of the overheat resistor in real time.
In the wind power yaw brake resistor overheating protection control method provided by the embodiment of the invention, the brake power of a brake resistor is monitored in real time to obtain the real-time brake power of the brake resistor; comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to a comparison result; calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient; judging whether the heat accumulation coefficient of the braking resistance is larger than a preset accumulation coefficient threshold value or not; and if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor. By the method, the accumulation coefficient of the brake resistor can be calculated, whether a stop signal is sent to stop the brake resistor to work is judged based on the accumulation coefficient threshold, extra hardware cost is not required to be added, and low-cost overload control on the brake resistor is achieved.
The embodiment of the invention also provides a wind power yaw brake resistor overheating protection control circuit, which comprises a bus DC, a drive controller M, a diode D and a brake resistor R, IGBT, wherein the drive controller M is connected with the bus DC through an insulated gate bipolar transistor Q; a first voltage input end of the driving controller M is connected with the positive end + DC of the bus, a second voltage input end of the driving controller M is connected with the negative end-DC of the bus, and a control signal output end of the driving controller M is connected with the grid electrode of the IGBT; a collector of the IGBT bipolar transistor Q is connected with one end of the resistor R and the anode of the diode D, and the other end of the resistor R and the cathode of the diode D are both connected with the positive end + DC of the bus; and the emitting electrode of the IGBT bipolar transistor Q is connected with the negative electrode end + DC of the bus. The drive controller M applies the wind power yaw brake resistance overheat protection control method described in the above embodiment. Wherein, a BR end (Brake Resistor) can be used for externally connecting other resistors.
The embodiment of the invention also provides a wind power yaw brake resistor overheating protection control device, which can be configured in a drive controller of a wind power yaw brake resistor overheating protection control circuit, and is used for executing any embodiment of the wind power yaw brake resistor overheating protection control method. Specifically, referring to fig. 9, fig. 9 is a schematic block diagram of a wind power yaw brake resistance overheat protection control device according to an embodiment of the present invention.
As shown in fig. 9, the wind power yaw brake resistance overheat protection control device 100 includes a real-time brake power monitoring unit 110, a brake accumulated time obtaining unit 120, a brake resistance heat accumulated coefficient obtaining unit 130, a brake resistance heat accumulated coefficient judging unit 140, and a stop signal transmitting unit 150.
The real-time braking power monitoring unit 110 is configured to monitor the braking power of the braking resistor in real time to obtain the real-time braking power of the braking resistor; a brake accumulation time obtaining unit 120, configured to compare a brake rated power in a preset brake time accumulation rule with the real-time brake power, and obtain a brake accumulation time according to a comparison result; a braking resistance heat accumulation coefficient obtaining unit 130, configured to calculate the braking accumulation time according to a preset braking resistance heat accumulation formula to obtain a corresponding braking resistance heat accumulation coefficient; a brake resistance heat accumulation coefficient judgment unit 140 for judging whether the brake resistance heat accumulation coefficient is greater than a preset accumulation coefficient threshold value; and a stop signal sending unit 150, configured to send a stop signal to stop the operation of the brake resistor if the heat accumulation coefficient of the brake resistor is greater than the accumulation coefficient threshold.
The wind power yaw brake resistor overheating protection control device provided by the embodiment of the invention is used for monitoring the brake power of the brake resistor in real time by applying the wind power yaw brake resistor overheating protection control method so as to obtain the real-time brake power of the brake resistor; comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to a comparison result; calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient; judging whether the heat accumulation coefficient of the braking resistance is larger than a preset accumulation coefficient threshold value or not; and if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor. By the method, the brake resistance accumulation coefficient can be calculated, whether a stop signal is sent to stop the brake resistance to work is judged based on the accumulation coefficient threshold, extra hardware cost is not required to be added, and low-cost overload control on the brake resistance is realized.
The drive controller in the wind power yaw brake resistor overheating protection control circuit can be implemented as wind power yaw brake resistor overheating protection control equipment, the equipment structure is shown in fig. 10, and a computer program for implementing wind power yaw brake resistor overheating protection control can run on the wind power yaw brake resistor overheating protection control equipment shown in fig. 10.
Referring to fig. 10, fig. 10 is a schematic block diagram of a wind power yaw brake resistance overheat protection control device according to an embodiment of the present invention. The wind power yaw brake resistor overheating protection control device can be used for executing a wind power yaw brake resistor overheating protection control method.
Referring to fig. 10, the wind power yaw brake resistance overheating protection control device 500 includes a processor 502, a memory, a voltage measurer 506 and a control signal output terminal 505 connected by a system bus 501, wherein the memory may include a storage medium 503 and an internal memory 504.
The two ports of the voltage measuring device 506 are respectively used as a first voltage input terminal and a second voltage input terminal, and the voltage measuring device 506 can measure the voltage value between the first voltage input terminal and the second voltage input terminal.
The storage medium 503 may store an operating system 5031 and a computer program 5032. The computer program 5032, when executed, may cause the processor 502 to execute the wind yaw brake resistance overheating protection control method, wherein the storage medium 503 may be a volatile storage medium or a non-volatile storage medium.
The processor 502 is used to provide computing and control capabilities to support the operation of the entire wind yaw brake resistance overheat protection control apparatus 500.
The internal memory 504 provides an environment for running the computer program 5032 in the storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 may be enabled to execute the wind power yaw brake resistor overheating protection control method.
The control signal output terminal 505 is used for outputting a control signal. It will be understood by those skilled in the art that the configuration shown in fig. 10 is a block diagram of only a portion of the configuration associated with the inventive arrangements and does not constitute a limitation of the wind power yaw brake resistive overheating protection control apparatus 500 to which the inventive arrangements are applied, and that a particular wind power yaw brake resistive overheating protection control apparatus 500 may include more or fewer components than shown in the figures, or some components in combination, or have a different arrangement of components.
The processor 502 is configured to run a computer program 5032 stored in the memory, so as to implement the corresponding functions in the wind power yaw brake resistor overheating protection control method.
Those skilled in the art will appreciate that the embodiment of the wind power yaw brake resistance overheating protection control apparatus shown in fig. 10 does not constitute a limitation on the specific configuration of the wind power yaw brake resistance overheating protection control apparatus, and in other embodiments, the wind power yaw brake resistance overheating protection control apparatus may include more or fewer components than illustrated, or some components in combination, or a different arrangement of components.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A wind power yaw brake resistor overheating protection control method is applied to a drive controller of a wind power yaw brake resistor overheating protection control circuit, and comprises the following steps:
monitoring the braking power of a braking resistor in real time to obtain the real-time braking power of the braking resistor;
comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power, and acquiring brake accumulation time according to a comparison result;
calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient;
judging whether the heat accumulation coefficient of the braking resistance is larger than a preset accumulation coefficient threshold value or not;
and if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value, sending a stop signal to stop the brake resistor.
2. The wind power yaw brake resistor overheating protection control method according to claim 1, wherein comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power and obtaining the brake accumulation time according to the comparison result comprises:
judging whether the real-time braking power is greater than the braking rated power;
if the real-time braking power is larger than the braking rated power, increasing the monitoring time period of the real-time braking power over the pre-stored historical braking accumulated time to obtain updated braking accumulated time;
if the real-time braking power is smaller than the braking rated power, subtracting the monitoring time period of the real-time braking power from the pre-stored historical braking accumulated time to obtain updated braking accumulated time;
and if the real-time braking power is equal to the braking rated power, taking the prestored historical braking accumulated time as the corresponding braking accumulated time in the monitoring time period when the real-time braking power is equal to the braking rated power.
3. The wind power yaw brake resistor overheating protection control method according to claim 1, wherein comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power and obtaining the brake accumulation time according to the comparison result comprises:
judging whether the real-time braking power is larger than the braking rated power or not to obtain a current power judgment state;
judging whether the current power judging state is the same as the previous power judging state;
if the current power judgment state is the same as the previous power judgment state, performing accumulation calculation according to the state duration of the current power judgment state to obtain state accumulation time;
judging whether the state accumulation time exceeds a preset time length threshold value or not;
if the state accumulation time exceeds the duration threshold or the current power judgment state is different from the previous power judgment state, updating the pre-stored historical brake accumulation time according to the stored state accumulation time to obtain updated brake accumulation time;
and after the state accumulation time is cleared, carrying out accumulation calculation again on the state accumulation time according to the current power judgment state.
4. The wind power yaw brake resistor overheating protection control method according to claim 1, wherein comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power and obtaining the brake accumulation time according to the comparison result comprises:
comparing the real-time braking power with the braking rated power to obtain a power difference value;
and multiplying the power difference value by the monitoring time period of the real-time braking power, and adding the multiplied power difference value to the prestored historical braking accumulation time to obtain updated braking accumulation time.
5. The wind power yaw brake resistance overheat protection control method according to claim 1, wherein the calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient comprises:
calculating the ratio of the brake accumulation time to the brake resistance thermal time constant
；
According to the heat accumulation formula of the braking resistance
And calculating to obtain the corresponding heat accumulation coefficient of the brake resistor.
6. The wind power yaw brake resistance overheat protection control method according to claim 5, before calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient, further comprising:
and acquiring the continuous power of the brake resistor and the single pulse energy of the brake resistor to calculate and obtain a brake resistor thermal time constant corresponding to the brake resistor.
7. The wind power yaw brake resistor overheating protection control method according to claim 1, wherein after the stop signal is sent to stop the brake resistor from working, the method further comprises:
setting the real-time braking power to be zero and acquiring braking accumulated time corresponding to the real-time braking power according to the braking time accumulated rule;
calculating the brake accumulation time according to the brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient;
judging whether the heat accumulation coefficient of the braking resistance is smaller than a preset reset coefficient threshold value or not;
and if the heat accumulation coefficient of the brake resistor is smaller than the reset coefficient threshold value, sending a reset signal to enable the brake resistor to recover the brake work.
8. A wind power yaw brake resistor overheating protection control circuit is characterized by comprising a bus, a drive controller, a diode, a brake resistor and an IGBT (insulated gate bipolar transistor);
a first voltage input end of the driving controller is connected with a positive end of the bus, a second voltage input end of the driving controller is connected with a negative end of the bus, and a control signal output end of the driving controller is connected with a grid electrode of the IGBT;
a collector of the IGBT is connected with one end of the resistor and the anode of the diode, and the other end of the resistor and the cathode of the diode are both connected with the anode end of the bus; the emitting electrode of the IGBT bipolar transistor is connected with the negative end of the bus;
the drive controller applies the wind power yaw brake resistance overheat protection control method according to any one of claims 1 to 7.
9. The utility model provides a wind-powered electricity generation driftage braking resistance overheat protection controlling means, its characterized in that, the device disposes in the drive controller of wind-powered electricity generation driftage braking resistance overheat protection control circuit, the device includes:
the real-time braking power monitoring unit is used for monitoring the braking power of the braking resistor in real time so as to obtain the real-time braking power of the braking resistor;
the brake accumulation time acquisition unit is used for comparing the brake rated power in a preset brake time accumulation rule with the real-time brake power and acquiring brake accumulation time according to a comparison result;
the brake resistance heat accumulation coefficient acquisition unit is used for calculating the brake accumulation time according to a preset brake resistance heat accumulation formula to obtain a corresponding brake resistance heat accumulation coefficient;
the brake resistance heat accumulation coefficient judging unit is used for judging whether the brake resistance heat accumulation coefficient is larger than a preset accumulation coefficient threshold value or not;
and the stop signal sending unit is used for sending a stop signal to stop the brake resistor if the heat accumulation coefficient of the brake resistor is larger than the accumulation coefficient threshold value.
10. A wind power yaw brake resistance overheat protection control apparatus, configured in a drive controller of a wind power yaw brake resistance overheat protection control circuit, the apparatus comprising a memory, a processor, a voltage measurer, a control signal output terminal, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the wind power yaw brake resistance overheat protection control method according to any one of claims 1 to 7.
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| CN202210542931.9A CN114665761B (en) | 2022-05-19 | 2022-05-19 | Wind power yaw brake resistor overheating protection control method, circuit, device and equipment |
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