CN209743088U

CN209743088U - Control device of autonomous side-bias fan

Info

Publication number: CN209743088U
Application number: CN201822277872.9U
Authority: CN
Inventors: 倪浩宏; 徐彤敏; 顾子怡; 柳进举
Original assignee: Shanghai Ghrepower Green Energy Co Ltd
Current assignee: Shanghai Ghrepower Green Energy Co Ltd
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2019-12-06
Anticipated expiration: 2028-12-30

Abstract

the utility model relates to a control device of autonomic side inclined to one side fan. The utility model discloses use the silicon controlled rectifier technique, change traditional diode rectification into diode and silicon controlled rectifier rectification, utilize the higher characteristics of withstand voltage of silicon controlled rectifier (can reach 1600V the highest). The system is additionally provided with an anemometer, when the system detects that the current wind speed exceeds the set wind speed, the control circuit cuts off the silicon controlled rectifier for rectification, the voltage in the direct current circuit is controlled within the safety range of the components, and the silicon controlled rectifier withstands the high voltage generated by the generator. At the moment, due to the disappearance of the load torque, the autonomous yaw protection of the generator can act in an accelerating way, the yaw function of the tail beam assembly of the fan is realized, the wind power absorbed by the wind wheel is reduced, the rotating speed of the fan is reduced, and the fan enters a safe operation interval.

Description

control device of autonomous side-bias fan

Technical Field

The utility model relates to an electrical control device of middle-size and small-size autonomic side deviation type fan.

Background

The independent lateral deviation protection function of the fan is realized by the important characteristic of the independent lateral deviation fan that when the wind speed reaches the designed lateral deviation protection rotating speed, the wind wheel moment of the fan is larger than the lateral deviation moment, the tail beam assembly of the fan performs lateral deviation action, the power absorbed by the fan is reduced, and the rotating speed of the fan is reduced.

When the lateral deviation function of the fan is realized, the balance among wind wheel torque, generator torque and load torque needs to be considered; the balance between the wind wheel moment and the lateral deviation moment has certain contradiction. In a traditional control strategy, due to the existence of load torque, a part of wind wheel moment can be offset, and when the rotating speed of a fan reaches a designed lateral deviation rotating speed, the wind wheel moment cannot be larger than the lateral deviation moment, so that lateral deviation protection cannot be realized. Once the load torque is cancelled, the generator enters an idle state, the rotating speed of the generator rises, and the direct-current voltage rises, so that components of a control system can be damaged.

In the control technology of the existing small and medium-sized fans, the input of the fan is generally adopted to obtain direct-current voltage through direct rectification of a rectifier bridge, then the direct-current voltage is connected to a subsequent electrolytic capacitor for energy storage, and the direct-current voltage is converted into direct-current voltage for a direct-current load through a DC/DC module at the later stage or the alternating-current voltage is converted into alternating-current voltage for an alternating-current load for use. The withstand voltage of an electrolytic capacitor in the circuit is 450VDC, and the maximum voltage of a power device is generally 600-650 VDC.

The circuit cannot realize the separation between alternating current and direct current. In order to ensure the safety of components in the system, the direct current voltage must be controlled to be less than 450VDC, and the control strategy requires that the circuit can not be disconnected from the load by utilizing a load torque control mode to ensure the safety of the circuit.

Disclosure of Invention

the utility model aims at: when the fan is automatically laterally deviated, lateral deviation protection can reliably act. Furthermore, the functions of protecting the wind driven generator and protecting the control system are realized.

In order to achieve the above object, the present invention provides a control device for an autonomous laterally-biased fan, including a three-phase rectification circuit, the three-phase ac voltage output by the fan is converted into dc bus voltage via the three-phase rectification circuit, the lower tube of the three-phase rectification circuit is diodes D1, D2, D3, and is characterized in that the upper tube of the three-phase rectification circuit is thyristors Q1, Q3, Q5, and the thyristors Q2, Q4, Q6 are connected in anti-parallel at two ends of the thyristors Q1, Q3, Q5 respectively; a control signal end of the microprocessor generates three control signals I through three photoelectric isolation chips I respectively, the three control signals I are connected with control ends of the controllable silicon Q1, Q3 and Q5 respectively, when the control signal end I gives a 12V voltage signal, the photoelectric isolation chip I is conducted, and when the control signal end I gives a 0V voltage signal, the photoelectric isolation chip I is cut off; the control signal end II of the microprocessor generates three control signals II through three photoelectric isolation chips II respectively, the three control signals II are connected with the control ends of the controllable silicon Q2, Q4 and Q6 respectively, when the control signal end II gives out a 12V voltage signal, the photoelectric isolation chip II is cut off, and when the control signal end II gives out a 0V voltage signal, the photoelectric isolation chip II is switched on;

the wind speed meter is connected with the acquisition signal input end of the microprocessor.

preferably, the system further comprises an isolation circuit, and the direct current bus voltage supplies power to the microprocessor after passing through the isolation circuit.

Preferably, the differential sampling circuit is further included, an input end of the differential sampling circuit is connected to the direct current bus voltage, and the differential sampling circuit outputs the direct current voltage signal Vdc with reduced equal ratio to the microprocessor.

Preferably, the three-phase rectifier circuit further comprises a hall current device, and the hall current device collects a current signal I _ in output by the three-phase rectifier circuit and sends the current signal I _ in to the microprocessor.

Preferably, the fan speed measuring circuit comprises a sampling resistor for sampling and shaping the U phase and the V phase of the three-phase alternating voltage output by the fan, a shaping circuit connected with the sampling resistor, and an isolation circuit connected with the shaping circuit, wherein square wave signals FINUV and FINOW generated by the two isolation circuits are sent to the microprocessor.

The utility model discloses use the silicon controlled rectifier technique, change traditional diode rectification into diode and silicon controlled rectifier rectification, utilize the higher characteristics of withstand voltage of silicon controlled rectifier (can reach 1600V the highest). The system is additionally provided with an anemometer, when the system detects that the current wind speed exceeds the set wind speed, the control circuit cuts off the silicon controlled rectifier for rectification, the voltage in the direct current circuit is controlled within the safety range of the components, and the silicon controlled rectifier withstands the high voltage generated by the generator. At the moment, due to the disappearance of the load torque, the autonomous yaw protection of the generator can act in an accelerating way, the yaw function of the tail beam assembly of the fan is realized, the wind power absorbed by the wind wheel is reduced, the rotating speed of the fan is reduced, and the fan enters a safe operation interval.

Drawings

Fig. 1 is a schematic diagram of the overall circuit of the present invention;

Fig. 2 is a power supply circuit of the present invention;

FIG. 3 is a fan speed measurement circuit;

FIG. 4 is a current sampling circuit;

Fig. 5 is a voltage sampling circuit.

Detailed Description

the present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

As shown in fig. 1, the utility model relates to a controlling means of autonomic side inclined to one side fan, including three-phase rectifier circuit, the three-phase alternating voltage U, V, W of fan output converts direct current BUS voltage DC _ BUS +, DC _ BUS-via three-phase rectifier circuit, and three-phase rectifier circuit's lower tube is diode D1, D2, D3, and three-phase rectifier circuit's upper tube is silicon controlled rectifier Q1, Q3, Q5, and silicon controlled rectifier Q2, Q4, Q6 are anti-parallel respectively at Q1, Q3, the both ends of Q5 silicon controlled rectifier; a control signal end WORK of the microprocessor generates three control signals A KA1, KA2 and KA3 through three photoelectric isolation chips U4, U5 and U6 respectively, and the three control signals A KA1, KA2 and KA3 are connected with control ends of the thyristors Q1, Q3 and Q5 respectively. When a 12V voltage signal is given by a control signal end WORK, the photoelectric isolation chips U4, U5 and U6 are conducted, when the zero crossing of the voltages applied to the two ends of the controllable silicon Q1, Q3 and Q5 is positive, the voltage is cut off when the voltage is negative, and therefore the zero crossing conduction design function is achieved. When a WORK at the control signal end gives a 0V voltage signal, the photoelectric isolation chips I U4, U5 and U6 are cut off, the silicon controlled rectifiers Q1, Q3 and Q5 are cut off, and the three-phase rectification circuit is disconnected. The two SHORT control signal terminals of the microprocessor respectively generate three control signals of two KB1, KB2 and KB3 through two U1, U2 and U3 of the three photoelectric isolation chips, and the two KB1, KB2 and KB3 control signals are respectively connected with the control terminals of the thyristors Q2, Q4 and Q6. When the second SHORT of the control signal terminal gives out a 12V voltage signal, the second photoelectric isolation chips U1, U2 and U3 are cut off, and the thyristors Q2, Q4 and Q6 are cut off. When the second SHORT of the control signal terminal gives out a 0V voltage signal, the second U1, the second U2 and the second U3 of the photoelectric isolation chip are conducted, and the thyristors Q2, Q4 and Q6 are conducted. In order to protect the safety of silicon controlled rectifier, the utility model discloses a design has the overvoltage control circuit in the circuit, when the fan rotational speed reached overvoltage protection action rotational speed, and control three-phase rectifier circuit's low tube both-way switch-on realizes the output short circuit of fan, utilizes electromagnetic torque to realize that the fan slows down. When the rotating speed of the fan does not meet the requirement of a lateral deviation action, the microprocessor controls the conduction of the controllable silicon Q1, Q3 and Q5, the three-phase full-wave rectification function of the fan input is realized, and a power supply is provided for a rear-stage DC/DC or DC/AC circuit. When the rotating speed of the fan reaches the requirement of the lateral deviation action, the microprocessor controls the silicon controlled rectifiers Q1, Q3 and Q5 to be disconnected, and the connection between the fan output and the direct current circuit is cut off. The fan is accelerated to enter a lateral deviation protection state.

The utility model discloses still including the anemometer that is used for measuring the wind speed, the anemometer links to each other with microprocessor's collection signal input end, when microprocessor detected current wind speed through the anemometer and surpassed preset's wind speed, microprocessor's control signal end WORK gave 0V voltage signal, and a photoelectric isolation chip U4, U5, U6 end for silicon controlled rectifier Q1, Q3, Q5 end, cut off three-phase rectifier circuit.

A special auxiliary power supply circuit is designed in the circuit, and an auxiliary power supply is generated by utilizing electric energy generated by rotation of the fan and is independent of an external power supply. Specifically, as shown in fig. 2, after the three-phase ac voltage U, V, W output by the fan and the rectified DC _ BUS + signal are isolated by the diode, a +12V voltage is generated by the circuit shown in the figure and is used by the circuit. As long as the fan is rotating, there can be a continuous power supply.

The utility model discloses can detect fan rotational speed, direct current bus voltage, signals such as direct current bus current. As shown in figure 3, the fan rotating speed measuring circuit measures the frequency of the U phase and the W phase, the signals are subjected to resistance sampling, then are shaped and isolated to obtain square wave signals FINUV and FINOW, and the square wave signals FINUV and FINOW are sent to a microprocessor for reading and processing.

As shown in fig. 4, the dc current signal I _ in with the same scaled down ratio is obtained by the hall current device U7 and sent to the microprocessor for reading.

As shown in fig. 5, the DC BUS voltage DC _ BUS +, DC _ BUS-is obtained by a differential sampling circuit as a DC voltage signal Vdc of reduced ratio, and sent to the microprocessor for reading. After the microprocessor obtains the direct current voltage signal Vdc, if the direct current voltage signal Vdc exceeds a set value, the second SHORT at the control signal end gives a 0V voltage signal, the first WORK at the control signal end gives a 12V voltage signal, and the three-phase rectification circuit is SHORT-circuited to realize the braking function of the fan.

Claims

1. A control device of an autonomous side-bias fan comprises a three-phase rectification circuit, wherein three-phase alternating-current voltage (U, V, W) output by the fan is converted into direct-current BUS voltage (DC _ BUS +, DC _ BUS-), a lower tube of the three-phase rectification circuit is diodes D1, D2 and D3, and the control device is characterized in that upper tubes of the three-phase rectification circuit are thyristors Q1, Q3 and Q5, and the thyristors Q2, Q4 and Q6 are connected in an anti-parallel mode at two ends of the thyristors Q1, Q3 and Q5 respectively; a first control signal end (WORK) of the microprocessor generates three paths of first control signals (KA1, KA2 and KA3) through three first photoelectric isolation chips (U4, U5 and U6), the three paths of first control signals (KA1, KA2 and KA3) are connected with control ends of the thyristors Q1, Q3 and Q5 respectively, when the first control signal end (WORK) gives out a 12V voltage signal, the first photoelectric isolation chips (U4, U5 and U6) are switched on, and when the first control signal end (WORK) gives out a 0V voltage signal, the first photoelectric isolation chips (U4, U5 and U6) are switched off; a second control signal end (SHORT) of the microprocessor generates a second three-way control signal (KB1, KB2 and KB3) through a second three-way photoelectric isolation chip (U1, U2 and U3), the second three-way control signal (KB1, KB2 and KB3) is connected with control ends of thyristors Q2, Q4 and Q6, when the second control signal end (SHORT) gives out a 12V voltage signal, the second photoelectric isolation chip (U1, U2 and U3) is cut off, and when the second control signal end (SHORT) gives out a 0V voltage signal, the second photoelectric isolation chip (U1, U2 and U3) is conducted;

2. The control device of claim 1, further comprising an isolation circuit, wherein the DC BUS voltage (DC _ BUS +, DC _ BUS-) supplies power to the microprocessor via the isolation circuit.

3. The control device of an autonomous lateralization fan as claimed in claim 1, further comprising a differential sampling circuit, wherein the input terminal of the differential sampling circuit is connected to the DC BUS voltage (DC _ BUS +, DC _ BUS-), and the differential sampling circuit outputs a DC voltage signal Vdc of reduced ratio to the microprocessor.

4. The control device of the autonomous side-bias fan of claim 1, further comprising a hall current device, wherein the hall current device (U7) collects a current signal I _ in output by the three-phase rectification circuit and sends the current signal I _ in to the microprocessor.

5. The control apparatus for an autonomous side-biased fan as claimed in claim 1, further comprising a fan speed measuring circuit including sampling resistors for sampling U-phase and V-phase of the three-phase ac voltage (U, V, W) output from the fan, a shaping circuit connected to the sampling resistors, and an isolation circuit connected to the shaping circuit, wherein the square wave signals finnv and finnw generated by the two isolation circuits are supplied to the microprocessor.