CN116447077A - Fan safety variable pitch control system and method - Google Patents
Fan safety variable pitch control system and method Download PDFInfo
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- CN116447077A CN116447077A CN202310688696.0A CN202310688696A CN116447077A CN 116447077 A CN116447077 A CN 116447077A CN 202310688696 A CN202310688696 A CN 202310688696A CN 116447077 A CN116447077 A CN 116447077A
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- 238000000034 method Methods 0.000 title claims description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 67
- 230000002829 reductive effect Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 13
- 238000011217 control strategy Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 17
- 230000008569 process Effects 0.000 description 14
- 230000009471 action Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 230000007246 mechanism Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/304—Spool rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/328—Blade pitch angle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/60—Control system actuates through
- F05B2270/602—Control system actuates through electrical actuators
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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
Abstract
The invention discloses a fan variable pitch control system, which comprises a rectification module, a diode, a driver and a super capacitor, wherein the rectification module is connected with the diode; one end of the rectifying module is connected with the power grid, the other end of the rectifying module is connected with the diode in series through the public bus, and the positive electrode end of the diode is connected with the rectifying module through the public bus; the negative electrode end of the diode is connected with the driver and the super capacitor through a common bus, the other end of the driver is connected with the control motor, and the driver is connected with the super capacitor in parallel through the common bus. According to the invention, the paddle is controlled by the variable-pitch control circuit, the rectification module is arranged in the circuit, so that the voltage and the current in the circuit are kept stable, and the super capacitor provides guarantee current for the control motor, so that the control motor controls the paddle to operate, the functional overlapping among the sub-components is reduced on the premise of ensuring the reliability, the interactive utilization of the functions or the capacities among the sub-components is realized, the cost is reduced, and the reliability is improved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a safe variable-pitch control system and method for a fan.
Background
Wind power generation is an important clean energy, the number of newly-increased wind power industry in China is continuously increased every year at present, the number of newly-increased wind power industry in wind power industry is continuously increased every year and the maintenance amount of the newly-increased wind power industry are continuously increased, the design of a fan unit faces the pressure of cost and reliability in the future, a blade control system is a key subsystem in a running system of the fan unit, the blade control system adjusts the angle of a hub in real time according to the wind speed faced by a fan and the power of a fan generator, so that a generator rotor runs in a reasonable working range, and when the fan breaks down, the blade control system recovers and controls the fan blades to prevent the overload running of the generator caused by the overlarge rotating speed of the blades, so that a blade-to-blade-variable control circuit of the fan is of great importance to the normal running of the fan unit. However, conventional pitch systems generally have two technical routes: one is an independent and decentralized sub-component (driver, charger, switching power supply, PLC, motor, super capacitor, power distribution device, etc.) integrated shaft cabinet; the other is based on an integrated driver (integrated with a driver, a charger, a switching power supply and a PLC), a motor, a super capacitor and a peripheral power distribution device to form a shaft cabinet; in terms of two technical routes, the shaft cabinet of each blade comprises a set of driver, motor, super capacitor, charger, PLC and other devices, the sub-components are respectively designed independently and provided by different suppliers, the shaft cabinet manufacturers integrate the sub-components together and then organically combine the sub-components together by using the PLC for control, and the traditional system has overlapping functions or capacities among the sub-components, for example, the driver in the shaft cabinet of three blades has three independent rectifying circuits, the bus capacitor inside the driver and the super capacitor outside the driver are overlapped, and the overlapping causes unnecessary increase of cost.
From the design point of view, on the premise of ensuring reliability and even improving redundancy, the functions or capacities of the sub-components which are overlapped in the middle are reduced as much as possible and the functions or capacities of the sub-components can be mutually utilized, so that the cost is reduced and the reliability is improved.
Disclosure of Invention
The embodiment of the invention provides a safe variable-pitch control system and method for a fan, which are used for controlling blades in a wind driven generator set, and aim to solve the problem that in the prior art, the blades in the wind driven generator set have overlapping functions in the running process of the sub-components of the fan blade control system, or the sub-components cannot mutually utilize the functions or the capacities of the sub-components, so that the equipment cost is high.
In a first aspect, the embodiment of the invention discloses a fan safety pitch control system, which comprises a rectifying module, a diode, a driver, a super capacitor and a control motor; the topology of the rectifying module is an AC/DC mode or an AC/DC+DC/DC mode, one end of the rectifying module is connected with a power grid, the other end of the rectifying module is connected with a diode in series through a public bus, the positive end of the diode is connected with the rectifying module through the public bus, and a thyristor is arranged in the rectifying module; the negative electrode end of the diode is connected with the driver and the super capacitor through a public bus, the other end of the driver is connected with the control motor, the driver is connected with the super capacitor in parallel through the public bus, and the driver is connected with the control motor and the gear assembly through the public bus;
if the control motor monitors the rotation state of the gear assembly and judges that the rotation speed of the hub exceeds a preset first normal value and does not exceed a preset second normal value, the control motor reduces the current transmission efficiency to the gear assembly based on a preset speed reduction control strategy; the second normal value is greater than the first normal value;
if the control motor monitors the rotation state of the gear assembly and judges that the rotation speed of the hub exceeds the second normal value, the control motor performs blade stop control based on a preset stop control strategy;
and if the control motor monitors that the torque of the hub is gradually in an ascending change trend and the instantaneous current of the driver exceeds a preset current threshold value, starting the super capacitor to supply power to the driver.
Further, the rectifying module is a primary half-control rectifying module, and the voltage output to the public bus by the primary half-control rectifying module is 560V.
Further, the rectification module is a two-stage half-control rectification module, and the voltage output to the public bus by the two-stage half-control rectification module is 320-480V.
Further, the primary half-control rectification module is an AD/DC half-control rectification topological module.
Further, the two-stage half-control rectification module comprises an AD/DC half-control rectification topological module and a voltage reduction topological module.
Further, the step-down topology module is an LLC resonant topology module.
Further, the step-down topology module is a BUCK topology module and a half-bridge topology module.
Further, a driving capacitor is arranged in the driver, and the driving capacitor is connected with the super capacitor in parallel.
Further, the diode is a decoupling diode.
In a second aspect, an embodiment of the invention discloses a fan safe pitch control method, which comprises the following steps:
the motor is controlled to acquire the rotating speed of the hub by monitoring the rotating state of the gear assembly;
if the rotation speed of the hub is determined to exceed the preset first normal value and not exceed the preset second normal value, the motor is controlled to reduce the current transmission efficiency to the gear assembly based on a preset speed reduction control strategy; the second normal value is greater than the first normal value;
if the rotation speed of the hub is determined to exceed the second normal value, controlling the motor to perform blade stopping control based on a preset stopping control strategy;
and if the rotation speed of the hub is determined to be gradually reduced in variation trend and the instantaneous current of the driver exceeds the preset current threshold, starting the super capacitor to supply power to the driver.
According to the fan safety pitch control system, the motor is controlled to control the paddles, the rectifying module and the diode are arranged in the circuit, so that the voltage and the current in the circuit are kept stable, the super capacitor is arranged to provide current guarantee for the control motor, the control motor still has current to normally control the paddles to be shut down and recycle the paddles under the abnormal condition of the circuit, when the voltage or the current in the circuit is abnormal, the rectifying module automatically cuts off the circuit to prevent the pitch control circuit from being accidentally damaged, all parts in the pitch control circuit are shut down in time when the circuit is abnormal, the operation safety of the system is ensured, the accident rate of equipment is reduced, the replacement times of the equipment are reduced, and the problem that the use cost of a fan unit is high is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an overall circuit diagram of a fan safety pitch control system provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial circuit of a fan safety pitch control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial circuit of a fan safety pitch control system according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a fan safety pitch control method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification 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 the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1 to 3, fig. 1 is an overall circuit diagram of a fan safety pitch control system provided by an embodiment of the present invention, fig. 2 is a schematic diagram of a primary topology AC/DC mode of a rectifier module 1 in the control system, and fig. 3 is a schematic diagram of a two-stage topology AC/dc+dc/DC mode of the rectifier module 1 in the control system. The fan safety pitch control system comprises a rectification module 1, a diode 2, a driver 4, a super capacitor 3, a control motor and a gear assembly; the rectifier module 1 is a half-control rectifier module 1, one end of the rectifier module 1 is connected with a power grid, the other end of the rectifier module 1 is connected with the diode 2 in series through a public bus, the positive end of the diode 2 is connected with the rectifier module 1 through the public bus, and a thyristor is arranged in the rectifier module 1; the negative electrode end of the diode 2 is connected with one end of the driver 4 and the super capacitor 3 through a common bus, the other end of the driver 4 is connected with the control motor, the driver 4 is connected with the super capacitor 3 in parallel through the common bus, and the driver 4 is connected with the control motor and the gear assembly through the common bus.
In an actual use scenario, the fan safety pitch control system disclosed in this embodiment is a control system including a pitch control circuit, which is connected to a power grid, a current of the power grid is input to the pitch control circuit and makes each component of the pitch control circuit electrified, the other end of the pitch control circuit is connected through a driving motor, a number machine and a fan blade gear, the pitch control circuit includes a rectifying module 1, the topology of the rectifying module 1 is in an AC/DC mode or an AC/dc+dc/DC mode, the rectifying module 1 is connected to the power grid, a current transmission line of the power grid forms a common bus through the rectifying module 1, an alternating current input into the pitch control circuit by the power grid is output to form a direct current after passing through the common bus, the rectifying module 1 is connected with the positive electrode end of a diode 2 through the common bus, the negative electrode of the diode 2 is connected with a driver 4, and the current is input into the driver 4 through the diode 2; specifically, a thyristor is arranged in the rectifying module 1, a common bus is in line communication through the thyristor, the driver 4 is connected in series with the diode 2 and the rectifying module 1 through the common bus, and the driver 4 and the super capacitor 3 are connected in parallel through the common bus, so that the driver 4 and the super capacitor 3 have the same voltage; the super capacitor 3 has a transient current absorption and storage function after the common bus is electrified, if the common bus is in abnormal current such as open circuit or short circuit, the super capacitor 3 can provide electric energy for the driver 4, so that the driver 4 can still control the control motor when the whole pitch control circuit is in abnormal current, and the pitch control process is kept in a normal state; specifically, the other end of the driver 4 is connected with a control motor, the control motor is fixedly connected with the blade through a connecting rod connected with a gear assembly, and the gear assembly and the connecting rod control the blade under the action of the control motor. In a specific operation process, air flows through the paddles in a static state and generates force on the paddles, the paddles perform pivoting movement about gear movement in the gear assembly through the connecting rod under the force action, when the rotation speed of the gears and the paddles is in a normal level, the control motor does not generate a control action on the paddles, the control motor can monitor the rotation state of the gear assembly and judge whether the rotation speed of the hub exceeds a preset normal value, if the rotation speed of the hub exceeds the preset normal value, the control motor is controlled to trigger the control mechanism to reduce the current transmission efficiency of the gear assembly, so that the rotation speed of the hub is gradually reduced under the drive of the gear assembly to keep a reasonable rotation speed, and the fan generator set keeps a safe operation state; further, if the voltage and current input by the power grid into the pitch control circuit are abnormal, so that functions of components in the system are disabled, a common bus in the system cannot provide current for the driver 4 and the control motor, the super capacitor 3 connected with the driver 4 in parallel can realize the function of providing electric energy for the driver 4 and the control motor, and the driver 4 and the control motor can keep normal operation under the auxiliary action of the super capacitor 3; further, a thyristor is arranged in the rectifying module 1, the thyristor with a certain specification has corresponding current and power threshold, a user selects thyristors with different specifications according to the current and power required by the variable-pitch control circuit in the operation process, if the current input by a power grid is abnormal and exceeds the current threshold of the thyristor, the rectifying module 1 cuts off the thyristor to enable the current to be incapable of being input into a public bus and the diode 2 through the rectifying module 1, so that the variable-pitch control circuit is kept in a static state, and when the current cannot flow through the public bus, the super capacitor 3 can provide electric energy for the driver 4 and the control motor, so that the driver 4 and the control motor can keep the operation state according to the use requirement of the user, and a gear component is provided for carrying out necessary control on the blade, so that the speed reduction, the stopping and the recovery of the blade are completed; further, a user can adopt a configuration mode of grid-connected output of two sets of rectifying modules 1 in a specific operation process of the system according to the requirements of the user on the use reliability and redundancy of the pitch control circuit, so that the rectifying modules 1 can be matched with super capacitors 3 with different voltage levels at the same time. It is easy to understand that in the fan safety pitch control system disclosed in this embodiment, the blades set in the system are set in one-to-one correspondence with the drivers 4, the drivers 4 are set in one-to-one correspondence with the supercapacitors 3, the number of the blades set in the pitch control circuit can be increased or reduced according to the actual use condition, and the number of the drivers 4 and the supercapacitors 3 set in the system is correspondingly adjusted according to the number of the blades.
In summary, the fan safety pitch control system disclosed in this embodiment provides stable and safe current transmission conditions for the blade pitch control process of the pitch control circuit by arranging the rectifying module 1 and the super capacitor 3 in the pitch control circuit, improves the stability of the current input into the pitch control circuit by the rectifying module 1 and the diode 2, prevents damage to components and disturbance of current transmission caused by reverse current due to unidirectional transmission of the current in a common bus in the form of direct current, connects the super capacitor 3 in parallel, and can utilize the electric energy storage function of the super capacitor 3 to transmit electric energy to the driver 4 and the control motor when the circuit is abnormal and cannot smoothly transmit the current so as to maintain control of the blade operation by the control motor, avoid failure of the blade operation control caused by unexpected damage of a power grid or a circuit system, effectively ensure that the pitch control circuit can timely control the speed reduction, the rotation and the recovery of the blade in abnormal condition, improve the risk resistance of the pitch control circuit, and ensure the safety of the blade operation of the pitch control circuit; because the super capacitor 3 and the bus capacitor are connected in parallel, the capacity of the bus capacitor in the driver 4 can be reduced, and meanwhile, the super capacitor 3 has the characteristic of absorbing instant energy, and a braking unit and a braking resistor of a variable pitch driver in the common prior art can be omitted; the thyristor arranged in the rectifying module 1 is pre-provided with a current threshold, when the current passing through the rectifying module 1 exceeds the current threshold, the thyristor is disconnected to prevent the high-voltage current from damaging the circuit system, so that the operation safety of the circuit system in the pitch control circuit is further ensured, the problem of insufficient use safety of the existing fan safe pitch control system is effectively solved, and if the problem of the use safety of the pitch control system can be effectively solved, the loss rate and the replacement rate of the pitch control system can be obviously reduced, the service life of the system is prolonged, and the use cost of the pitch control system is obviously reduced.
Further, the rectifying module 1 is a primary half-control rectifying module 1, and the voltage output by the primary half-control rectifying module 1 to the common bus is 560V. In another embodiment, the rectifying module 1 is a two-stage half-control rectifying module 1, and the voltage output by the two-stage half-control rectifying module 1 to the common bus is 320V-480V. Further, the primary half-control rectification module 1 is an AD/DC half-control rectification topological module. In another embodiment, further, the two-stage half-controlled rectifying module 1 includes an AD/DC half-controlled rectifying topology module and a buck topology module. Specifically, the rectifying module 1 can be used as a primary AD/DC topology to output a rectified direct current, namely, a current with the voltage of 400V input into the circuit system from a power grid is output into a current with the voltage of 560V after passing through the primary AD/DC topology, so that the boost topology is completed, and the current in the common bus accords with the electricity standard of the pitch control circuit. If the rectifying module 1 is a two-stage half-control rectifying module 1, the rectifying module 1 includes a one-stage AC/DC topology, that is, an AC/dc+dc/DC topology, and after the current with the voltage of 400V input into the current system by the power grid passes through the AC/dc+dc/DC, the voltage value can be adjusted within the range of 320V-480V, so that the rectifying module 1 is adapted to different capacitor modules.
Further, the buck topology module is an LLC resonant topology module. Specifically, an LLC resonant topology module is added into the circuit to perform voltage reduction regulation when the circuit voltage is abnormal, so that the stability of the circuit voltage is maintained.
Further, the BUCK topology module is a BUCK topology module and a half-bridge topology module. Specifically, the BUCK resonant topology module and the half-bridge topology module are added into the circuit, so that voltage reduction adjustment can be performed when the circuit voltage is abnormal, and the stability maintenance efficiency of the circuit voltage is further improved.
Further, a driving capacitor is arranged in the driver 4, and the driving capacitor is connected with the super capacitor 3 in parallel. Specifically, a driving capacitor arranged in the driver 4 is connected in parallel with the super capacitor 3 in the pitch control circuit, and if the circuit is abnormal to cause current interruption in the circuit, the super capacitor 3 can transmit the electric energy stored by itself to the driving capacitor, so that the driver 4 maintains a normal running state.
Further, the diode 2 is a decoupling diode. Specifically, the load in the direct current loop causes direct current power supply noise in the process of state adjustment setting, a peak current with a larger value is easy to generate on a power line and a transient noise voltage is formed in the process of state conversion of the direct current circuit, and the decoupling capacitor is arranged on the common bus for switching on the direct current of the pitch control circuit disclosed by the embodiment, so that noise generated by state adjustment of the load can be effectively restrained.
Further, the diode 2 is a zener diode. Specifically, a zener diode is provided in the circuit system to avoid a significant change in the voltage in the circuit due to a change in the magnitude of the current, so that maintaining the voltage in the circuit in a relatively stable state is beneficial to the normal operation of the driver 4 and the control motor.
The embodiment of the invention also provides a fan safe pitch control method, as shown in fig. 4, which comprises the following steps:
s110, controlling a motor to acquire the rotation speed of the hub by monitoring the rotation state of the gear assembly;
s120, if the rotation speed of the hub is determined to exceed a preset first normal value and not exceed a preset second normal value, controlling the motor to reduce the current transmission efficiency to the gear assembly based on a preset speed reduction control strategy; the second normal value is greater than the first normal value;
s130, if the rotation speed of the hub exceeds the second normal value, controlling the motor to perform blade stop control based on a preset stop control strategy;
and S140, if the torque of the hub is determined to be gradually rising and changing trend and the instantaneous current of the driver exceeds the preset current threshold value, starting the super capacitor to supply power to the driver.
In this embodiment, referring to fig. 1-3, the other end of the pitch control circuit is connected through a driving motor, a number machine and a fan blade gear, the pitch control circuit includes a rectification module 1, the rectification module 1 is in an AC/DC mode or an AC/dc+dc/DC mode, the rectification module 1 is connected with a power grid, a current transmission line of the power grid passes through the rectification module 1 and forms a common bus in the rectification module 1, an alternating current input into the pitch control circuit by the power grid is output to form a direct current after passing through the common bus, the rectification module 1 is connected with an anode end of a diode 2 by the common bus, a cathode end of the diode 2 is connected with a driver 4, and the current is input into the driver 4 through the diode 2; specifically, a thyristor is arranged in the rectifying module 1, a common bus is in line communication through the thyristor, the driver 4 is connected in series with the diode 2 and the rectifying module 1 through the common bus, and the driver 4 and the super capacitor 3 are connected in parallel through the common bus, so that the driver 4 and the super capacitor 3 have the same voltage; the super capacitor 3 has a transient current absorption and storage function after the common bus is electrified, if the common bus is in abnormal current such as open circuit or short circuit, the super capacitor 3 can provide electric energy for the driver 4, so that the driver 4 can still control the control motor when the whole pitch control circuit is in abnormal current, and the pitch control process is kept in a normal state; specifically, the other end of the driver 4 is connected with a control motor, the control motor is fixedly connected with the blade through a connecting rod connected with a gear assembly, and the gear assembly and the connecting rod control the blade under the action of the control motor. In a specific operation process, air flows through the paddles in a static state and generates force on the paddles, the paddles perform pivoting movement about gear movement in the gear assembly through the connecting rod under the force action, when the rotation speed of the gears and the paddles is in a normal level, the control motor does not generate a control action on the paddles, the control motor can monitor the rotation state of the gear assembly and judge whether the rotation speed of the hub exceeds a preset normal value, if the rotation speed of the hub exceeds the preset normal value, the control motor is controlled to trigger the control mechanism to reduce the current transmission efficiency of the gear assembly, so that the rotation speed of the hub is gradually reduced under the drive of the gear assembly to keep a reasonable rotation speed, and the fan generator set keeps a safe operation state; further, if the voltage and current input by the power grid into the pitch control circuit are abnormal, so that functions of components in the system are disabled, a common bus in the system cannot provide current for the driver 4 and the control motor, the super capacitor 3 connected with the driver 4 in parallel can realize the function of providing electric energy for the driver 4 and the control motor, and the driver 4 and the control motor can keep normal operation under the auxiliary action of the super capacitor 3; further, a thyristor is arranged in the rectifying module 1, the thyristor with a certain specification has corresponding current and power threshold, a user selects thyristors with different specifications according to the current and power required by the variable-pitch control circuit in the operation process, if the current input by a power grid is abnormal and exceeds the current threshold of the thyristor, the rectifying module 1 cuts off the thyristor to enable the current to be incapable of being input into a public bus and the diode 2 through the rectifying module 1, so that the variable-pitch control circuit is kept in a static state, and when the current cannot flow through the public bus, the super capacitor 3 can provide electric energy for the driver 4 and the control motor, so that the driver 4 and the control motor can keep the operation state according to the use requirement of the user, and a gear component is provided for carrying out necessary control on the blade, so that the speed reduction, the stopping and the recovery of the blade are completed; further, a user can adopt a configuration mode of grid-connected output of two sets of rectifying modules 1 in a specific operation process of the system according to the requirements of the user on the use reliability and redundancy of the pitch control circuit, so that the rectifying modules 1 can be matched with super capacitors 3 with different voltage levels at the same time. It is easy to understand that in the fan safety pitch control system disclosed in this embodiment, the blades set in the system are set in one-to-one correspondence with the drivers 4, the drivers 4 are set in one-to-one correspondence with the supercapacitors 3, the number of the blades set in the pitch control circuit can be increased or reduced according to the actual use condition, and the number of the drivers 4 and the supercapacitors 3 set in the system is correspondingly adjusted according to the number of the blades.
The invention discloses a fan safety pitch control system which comprises a rectifying module 1, a diode 2, a driver 4, a super capacitor 3, a control motor and a gear assembly, wherein the rectifying module is connected with the diode 2; the rectifier module 1 is a half-control rectifier module 1, one end of the rectifier module 1 is connected with a power grid, the other end of the rectifier module 1 is connected with the diode 2 in series through a public bus, the positive end of the diode 2 is connected with the rectifier module 1 through the public bus, and a thyristor is arranged in the rectifier module 1; the negative electrode end of the diode 2 is connected with the driver 4 and the super capacitor 3 through a public bus, the other end of the driver 4 is connected with the control motor, the driver 4 is connected with the super capacitor 3 in parallel through the public bus, the control motor is connected with the generator blade through a gear component, the fan safe pitch control system controls the blade through a pitch control circuit, the rectification module 1 is arranged in the circuit to enable voltage and current in the circuit to be kept stable, and guarantee current is provided for the control motor through the super capacitor 3, so that the control motor controls the blade to operate, functional overlapping among sub-components in the system is reduced on the premise of guaranteeing reliability, interactive utilization of functions or capacities among the sub-components is realized, cost reduction is realized, and reliability is improved.
According to the fan safety pitch control system disclosed by the embodiment, the rectification module 1 and the super capacitor 3 are arranged in the control circuit of the system, so that stable and safe current transmission conditions are provided for the pitch control process of the blades of the pitch control circuit, the pitch control circuit can be effectively ensured to timely control the speed reduction, the stopping and the recovery of the blades under abnormal conditions, the risk resistance of the pitch control circuit is improved, the safety of the integral operation of the pitch control system is ensured, the number of times of replacement of equipment caused by equipment faults is reduced, and the problem of higher use cost in the existing fan blade control process is effectively solved.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The safe variable pitch control system of the blower is used for connecting a control motor and a gear assembly to control the operation of blades of a wind driven generator and is characterized by comprising a rectifying module, a diode, a driver and a super capacitor;
the topology of the rectifying module is in an AC/DC mode or an AC/DC+DC/DC mode, one end of the rectifying module is connected with a power grid, the other end of the rectifying module is connected with the diode in series through a public bus, the positive end of the diode is connected with the rectifying module through the public bus, and the number of the rectifying modules is at least one group;
the negative electrode end of the diode is connected with the driver and the super capacitor through a public bus, the other end of the driver is connected with the control motor, the driver is connected with the super capacitor in parallel through the public bus, and the driver is connected with the control motor and the gear assembly through the public bus;
if the control motor monitors the rotation state of the gear assembly and judges that the rotation speed of the hub exceeds a preset first normal value and does not exceed a preset second normal value, the control motor reduces the current transmission efficiency to the gear assembly based on a preset speed reduction control strategy; the second normal value is greater than the first normal value;
if the control motor monitors the rotation state of the gear assembly and judges that the rotation speed of the hub exceeds the second normal value, the control motor performs blade stop control based on a preset stop control strategy;
and if the control motor monitors that the torque of the hub is gradually in an ascending change trend and the instantaneous current of the driver exceeds a preset current threshold value, starting the super capacitor to supply power to the driver.
2. The fan safety pitch control system of claim 1, wherein the rectifying module is a primary half-control rectifying module, and the voltage output to the common bus by the primary half-control rectifying module is 560V.
3. The fan safety pitch control system of claim 1, wherein the rectifier module is a two-stage half-controlled rectifier module, and the voltage output to the common bus by the two-stage half-controlled rectifier module is 320V-480V.
4. The fan safety pitch control system of claim 2, wherein the primary semi-controlled rectifier module is an AD/DC semi-controlled rectifier topology module.
5. The fan safety pitch control system of claim 3, wherein the two-stage half-controlled rectifier module comprises an AD/DC half-controlled rectifier topology module and a buck topology module.
6. The fan safety pitch control system of claim 5, wherein the buck topology module is an LLC resonant topology module.
7. The fan safety pitch control system of claim 5, wherein the BUCK topology module is a BUCK topology module and a half-bridge topology module.
8. The fan safety pitch control system of claim 1, wherein a drive capacitor is disposed in the driver, the drive capacitor being connected in parallel with the super capacitor.
9. The fan safety pitch control system of claim 1, wherein the diode is a decoupling diode.
10. A fan safety pitch control method applied to a fan safety pitch control system according to any one of claims 1 to 9, the method comprising:
the motor is controlled to acquire the rotating speed of the hub by monitoring the rotating state of the gear assembly;
if the rotation speed of the hub is determined to exceed the preset first normal value and not exceed the preset second normal value, the motor is controlled to reduce the current transmission efficiency to the gear assembly based on a preset speed reduction control strategy; the second normal value is greater than the first normal value;
if the rotation speed of the hub is determined to exceed the second normal value, controlling the motor to perform blade stopping control based on a preset stopping control strategy;
and if the rotation speed of the hub is determined to be gradually reduced in variation trend and the instantaneous current of the driver exceeds the preset current threshold, starting the super capacitor to supply power to the driver.
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