CN220711112U

CN220711112U - Device for reducing PMC fault rate and fan variable pitch system

Info

Publication number: CN220711112U
Application number: CN202322126889.5U
Authority: CN
Inventors: 狐苏建; 陈君; 张超; 靖鑫; 李霁; 郭睿; 贺坤; 张伟; 朱昊鹏; 马柄旭
Original assignee: Huaneng New Energy Co Ltd Shanxi Branch
Current assignee: Huaneng New Energy Co Ltd Shanxi Branch
Priority date: 2023-08-08
Filing date: 2023-08-08
Publication date: 2024-04-02
Anticipated expiration: 2033-08-08

Abstract

The utility model relates to the technical field of variable propeller controllers, in particular to a device for reducing PMC fault rate and a fan variable propeller system. According to the utility model, the external intermediate relay is added in the original band-type brake loop, the motor band-type brake contact is directly controlled in the original PMC module to be changed into the new external relay coil, the motor band-type brake is controlled by the new external relay, and the power on and power off of the electromagnetic band-type brake are controlled by the normally open contact of the new external relay.

Description

Device for reducing PMC fault rate and fan variable pitch system

Technical Field

The utility model relates to the technical field of variable-pitch controllers, in particular to a device for reducing PMC fault rate and a fan variable-pitch system.

Background

The pitch mechanism is an important component in a wind driven generator and is used for adjusting the angle of a fan blade so that the fan blade can be more efficiently converted into mechanical energy by utilizing the kinetic energy of wind. In wind power generation systems, the PMC module of the pitch mechanism is responsible for controlling the rotational angle of the blades in response to changes in wind speed.

Referring to fig. 2, an electrical schematic block diagram of a PMC module in the prior art is shown, a motor anti-reverse diode is connected to the PMC module, and a braking relay inside the PMC module directly controls a brake coil of a variable pitch motor; specifically, the negative pole of the diode is connected to the braking terminal X6.4 of the PMC module, the positive pole of the diode is connected to the 0V ground port of the PMC module, and the braking terminal X6.3 of the PMC module is connected to the 24V power supply port of the PMC module. In recent years, the pitch control system frequently reports faults such as 91-degree limit switch faults, 95-degree limit switch faults, motor grounding short circuit faults, obvious increase of motor output current, abnormal sound when the motor operates and the like. The faults can be reset, but the same faults can be repeatedly reported after the faults are reset, the faults can be basically eliminated by replacing the PMC on site, and only the individual fans need to replace the variable pitch motor again, so that the faults can be eliminated. The fault is counted to account for about 30% of the annual fault rate, and the safe and stable operation and the economic benefit of the wind power plant are seriously affected. In addition, because the electromagnetic band-type brake of the variable pitch control mechanism frequently acts for a long time, devices in the PMC module are damaged, and the blocking phenomenon occurs at the contacts of the electromagnetic band-type brake relay corresponding to the braking terminals X6.3 and X6.4 pins, so that the damage of spare parts can also cause the failure of the fan.

Frequent fault shutdown of the PMC can influence the utilization hours of the fan; meanwhile, PMC frequently fails, and needs to be processed by a tower, so that the time for recovering the fan is long, and the utilization hours of the fan are seriously influenced; in addition, when the PMC fails, the fan cannot collect the propeller, so that the fan flies, and serious safety accidents are easy to occur; the cost of a single PMC is about 2.3 ten thousand yuan, about 30 PMCs need to be replaced every year, the maintenance cost is more than 70 ten thousand yuan, the PMC replacement loss is larger, the cost is higher, and the cost is higher as the running time is longer.

Therefore, how to ensure safe operation of the wind power plant, full-power and multi-supply and improve the utilization rate of the wind turbine, and the problem to be solved is urgent at present.

Disclosure of Invention

The utility model aims to provide a device for reducing PMC fault rate and a fan pitch system, which are characterized in that an external intermediate relay is added in an original band-type brake loop, a motor band-type brake contact is directly controlled in an original PMC module to be changed into a new external relay coil, the motor band-type brake is controlled by the new external relay to act, and the normally open contact of the new external relay is used for controlling the power-on and power-off of an electromagnetic band-type brake, so that the problem of high PMC module fault rate in the prior art is solved.

The embodiment of the utility model is realized by the following technical scheme: the utility model provides a reduce device of PMC fault rate, includes PMC module, diode and band-type brake coil, PMC module, diode and band-type brake coil constitute electromagnetic band-type brake return circuit, electromagnetic band-type brake return circuit still includes external relay, external relay links to each other with PMC module, band-type brake coil, is controlled motor band-type brake action by external relay.

According to a preferred embodiment, the external relay is an intermediate relay.

According to a preferred embodiment, the negative electrode of the diode is connected to a normally open contact of the intermediate relay, the normally closed contact of the intermediate relay is connected to a 24V power supply port of the PMC module, the positive electrode of the diode is connected to a 0V ground wire port of the PMC module, and the normally open contact of the intermediate relay controls power on and power off of the electromagnetic band-type brake loop.

According to a preferred embodiment, the braking terminal X6.3 of the PMC module is connected to a 24V power supply port of the band-type brake coil, the braking terminal X6.4 of the PMC module is connected to a 0V ground port of the band-type brake coil through a coil of an intermediate relay, and the coil of the intermediate relay controls the motor band-type brake to operate.

The utility model also provides a fan pitch system, which comprises the device for reducing the PMC fault rate.

The technical scheme of the device for reducing the PMC fault rate and the fan variable pitch system provided by the embodiment of the utility model has at least the following advantages and beneficial effects: according to the utility model, the external intermediate relay is added in the original band-type brake loop, the motor band-type brake contact is directly controlled in the original PMC module to be changed into the new external relay coil, the motor band-type brake is controlled by the new external relay, and the power on and power off of the electromagnetic band-type brake are controlled by the normally open contact of the new external relay.

Drawings

FIG. 1 is an electrical schematic diagram of an apparatus for reducing PMC failure rate according to embodiment 1 of the present utility model;

FIG. 2 is an electrical schematic block diagram of a prior art PMC module;

icon: the device comprises a 1-PMC module, a 2-diode, a 3-band-type brake coil, a 4-normally open contact, a 5-normally closed contact, a 6-coil, a 7-braking terminal X6.3, an 8-braking terminal X6.4 and a 9-braking relay.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

The utility model provides a device for reducing PMC fault rate, which comprises a PMC module 1, a diode 2 and a band-type brake coil 3, wherein the PMC module 1, the diode 2 and the band-type brake coil 3 form an electromagnetic band-type brake loop. Referring to fig. 1, fig. 1 is an electrical schematic diagram of an apparatus for reducing PMC failure rate according to an embodiment of the present utility model.

Further, the electromagnetic band-type brake loop further comprises an external relay, the external relay is connected with the PMC module 1 and the band-type brake coil 3, and the external relay controls the motor band-type brake to act. Specifically, the external relay adopted in the embodiment is an intermediate relay; wherein the cathode of the diode 2 is connected to a normally open contact 4 of an intermediate relay, and a normally closed contact 5 of the intermediate relay is connected to a 24V power supply port of the PMC module 1; the 24V power supply port is a 24V direct current power supply, and the 24V direct current power supply is connected to the brake relay 9 in the PMC module 1 to provide required electric energy for the brake relay 9 in the PMC module 1 so that the brake relay 9 in the PMC module 1 can work normally; the positive electrode of the diode 2 is connected to a 0V ground wire port of the PMC module 1, and the normally open contact 4 of the intermediate relay controls the power on and off of the electromagnetic band-type brake loop; it should be noted that the electromagnetic band-type brake needs to be connected with the ground wire of the electrical system to ensure the normal operation of the circuit, and the 0V ground wire port is used for establishing electrical grounding, ensuring the reliable transmission of signals and providing electrical safety.

With respect to the brake terminals X6.37 and X6.48 of the PMC module 1, it should be noted that the brake terminals X6.37 and X6.48 are typically used for connecting brake resistors for controlling the braking operation of the pitch system; wherein the brake terminal X6.37 is a connection terminal of a brake resistor, and the brake resistor connected to the X6.3 is used for absorbing kinetic energy in the pitch system so as to realize quick and controllable braking operation. When braking is required, the PMC module 1 sends a signal to X6.3 to activate a braking resistor, so that kinetic energy in the pitch system is converted and dissipated; the brake terminal X6.48 is a control terminal in a loop, and a signal connected to the brake terminal X6.4 is used for controlling the start and stop of a brake operation; when braking is required, the PMC module 1 sends a signal to X6.4 to control the activation of the braking resistor; conversely, when braking is not required, the PMC module 1 will send a corresponding signal to X6.4 to stop the braking operation. The two braking terminals are mainly used for controlling and operating the braking resistor, so that the pitch system can effectively slow down and stop rotating when braking is needed. Further, the braking terminal X6.37 of the PMC module 1 is connected to the 24V power supply port of the band-type brake coil 3, the braking terminal X6.48 of the PMC module 1 is connected to the 0V ground wire port of the band-type brake coil 3 through the coil 6 of the intermediate relay, and the coil 6 of the intermediate relay controls the motor band-type brake to act and reduces the impact current born by the PMC module 1.

In summary, the external intermediate relay is added in the original band-type brake loop, the direct control motor band-type brake contact in the original PMC module 1 is changed into the direct control of the newly-added external relay coil 6, the motor band-type brake is controlled to act by the newly-added external relay, and the normally-open contact 4 of the newly-added external relay is used for controlling the power-on and power-off of the electromagnetic band-type brake.

Example 2

The present embodiment provides a fan pitch system comprising a device for reducing PMC failure rate as described in embodiment 1.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a reduce device of PMC fault rate, includes PMC module (1), diode (2) and band-type brake coil (3), PMC module (1), diode (2) and band-type brake coil (3) constitute electromagnetism band-type brake return circuit, its characterized in that, electromagnetism band-type brake return circuit still includes external relay, external relay links to each other with PMC module (1), band-type brake coil (3).

2. The PMC failure rate reducing device of claim 1, wherein said external relay is an intermediate relay.

3. A device for reducing PMC failure rate according to claim 2, characterised in that the negative pole of the diode (2) is connected to a normally open contact (4) of an intermediate relay, the normally closed contact (5) of the intermediate relay is connected to a 24V supply port of the PMC module (1), and the positive pole of the diode (2) is connected to a 0V ground port of the PMC module (1).

4. A device for reducing PMC failure rate according to claim 3, characterised in that the braking terminal X6.3 (7) of the PMC module (1) is connected to the 24V supply port of the band-type brake coil (3), and the braking terminal X6.4 (8) of the PMC module (1) is connected to the 0V ground port of the band-type brake coil (3) via the coil (6) of the intermediate relay.

5. A fan pitch system comprising a PMC failure rate reducing device according to any one of claims 1 to 4.