CN211737364U

CN211737364U - Wind turbine generator system frequency conversion device and driftage system

Info

Publication number: CN211737364U
Application number: CN202020259653.2U
Authority: CN
Inventors: 李仕云; 郭育华; 卢国涛; 余胜; 王强
Original assignee: Chengdu Site Electric Technology Co ltd
Current assignee: Chengdu Site Electric Technology Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-10-23
Anticipated expiration: 2030-03-05

Abstract

The utility model discloses a wind turbine generator system frequency conversion device and driftage system, wherein frequency conversion device includes: the control part is used for being connected with a main control cabinet of the yaw system, receiving a yaw command of the main control cabinet and generating a motor driving command and a mode switching signal; the frequency conversion part is connected with the control part and used for being connected with the main control cabinet, receiving a motor driving instruction sent by the control part and driving a yaw motor of the yaw system according to the motor driving instruction; and the switch part is connected with the control part and the frequency conversion part, is used for being connected with a main control cabinet, a yaw motor and a hydraulic system of a yaw system, receives a mode switching signal sent by the control part, and switches a frequency conversion mode and a direct-throwing mode according to the mode switching signal. The utility model discloses a behind the frequency conversion device embedding driftage system for the driftage system possesses frequency conversion mode and direct-cast mode simultaneously, and need not to change cabin master control procedure.

Description

Wind turbine generator system frequency conversion device and driftage system

Technical Field

The utility model belongs to wind power generation equipment field especially relates to a wind turbine generator system frequency conversion device and driftage system.

Background

The wind energy is a pollution-free resource which can be continuously utilized, the wind energy can be reasonably and effectively developed to bring huge economic, social and environmental benefits, the single machine capacity of the wind turbine generator in China reaches the megawatt level at present, and the wind energy has strong development prospect. The yawing system is a special servo system of a wind turbine generator and has the main functions of: the wind can be automatically and accurately aligned in the available wind speed range, the non-available wind speed range can realize 90-degree crosswind, the cables and the like can be automatically removed when the unidirectional yawing stroke is too long, and then the fan can safely, stably and reliably run, and the wind energy is efficiently utilized. Yaw systems for most wind turbines generally include: a wind vane, an anemoscope, a yaw motor, a large gear of a revolving body, a yaw planetary gear reducer and the like. The yaw principle is as follows: the wind direction signal of the induction wind vane is transmitted to the main control cabinet of the engine room, the main control cabinet sends a left or right yaw command to the yaw motor after calculation and comparison, and the yaw motor acts on the large gear of the revolving body through the yaw moment after being decelerated by the reducer coaxially connected to drive the wind wheel to yaw to wind. And when the yaw is finished, stopping the yaw motor, and finishing the yaw process.

As shown in FIG. 1, the existing wind turbine yaw control system consists of simpler electrical control and 4 yaw motors. The three-phase AC400V is connected with the input end of a yaw power supply breaker QF01, the phase A of the output end of the yaw power supply breaker QF01 is connected with the phase C of the input end of a left yaw contactor KM01 and the phase A of the input end of a right yaw contactor KM 02; the B phase of the output end of the yaw power supply breaker QF01 is connected with the B phase of the input end of the left yaw contactor KM01 and the B phase of the input end of the right yaw contactor KM 02; the C at the output end of the yaw power supply breaker QF01 is connected with the A phase at the input end of the left yaw contactor KM01 and the C phase at the input end of the right yaw contactor KM 02; the A, B, C three-phase of left side yaw contactor KM01 output respectively with the A, B, C three-phase connection of right side yaw contactor KM02 output, the input A of the protection circuit breaker of 4 yaw motors, B, C three-phase connection, the A of 4 protection circuit breaker outputs, B, C three-phase connection respectively with the U of the yaw motor that corresponds, V, W three-phase connection.

The yaw signal of the current cabin master control cabinet comprises four signals: high/low hydraulic pressure order, left driftage order, right driftage order, electromagnetism brake power. Yaw starting and direction are realized by sending a yaw command to drive the corresponding yaw contactor through the main control cabinet of the engine room. And the main control cabinet of the engine room sends a left or right deflection instruction and simultaneously sends a low hydraulic command to drive the hydraulic system to switch back to low hydraulic pressure from high hydraulic pressure. In addition, a braking power supply of the yaw motor is sequentially connected with the normally closed NC auxiliary contacts of the left yaw contactor and the right yaw contactor, so that the motor electromagnetic valve is ensured to be loosened in a power-off brake in the yaw process, and the motor electromagnetic valve is electrified after yaw is finished. Such a simple yaw control brings about the following problems:

firstly, when the yaw is started, 4 motors are directly switched (directly switched for short, the same below) to drive, so that large current impact and mechanical impact are inevitably caused, on one hand, the motors are electrically and mechanically damaged, and a yaw gear box is damaged, and on the other hand, the large current impact influences the quality of a power supply and the normal operation of other equipment.

Secondly, the gear box gaps of 4 motors are not completely consistent, the loads of all yaw motors are possibly different in the direct-throwing mode, the load with small gaps is large, the load with large gaps is small, on one hand, the motor with large loads can be subjected to overload protection tripping to damage the generated energy and even the motor is burnt out, and on the other hand, the gear box with large loads can be damaged to increase the maintenance cost.

Thirdly, electric braking cannot be realized in a direct-throwing mode, kinetic energy of an engine room is absorbed by a brake disc of a motor and a hydraulic system in a yaw braking process, so that abrasion of a braking system is large, scrap iron generated by braking is cleaned frequently, and maintenance workload is increased.

In addition, there are frequency conversion driftage equipment in the market at present, it adopts 1 to drag 4 general converter to replace the mode of putting directly and realize soft start soft stop, but need to change the master control procedure of cabin master control cabinet, and the master control procedure relates to the safety chain of fan, and the risk is high, and 1 drags 4 general converter not to possess the fault-tolerant design, and the driftage system stops when breaking down and harm the generated energy.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a wind turbine generator system frequency conversion equipment and driftage system.

The purpose of the utility model is realized through the following technical scheme: a wind turbine generator system frequency conversion device comprises:

a control part for connecting with the main control cabinet of the yaw system, receiving the yaw command of the main control cabinet and generating the motor drive

Command and mode switching signals;

the frequency conversion part is connected with the control part and used for being connected with the main control cabinet, receiving a motor driving instruction sent by the control part and driving a yaw motor of the yaw system according to the motor driving instruction;

and the switch part is connected with the control part and the frequency conversion part, is used for being connected with a main control cabinet, a yaw motor and a hydraulic system of a yaw system, receives a mode switching signal sent by the control part, and switches a frequency conversion mode and a direct-throwing mode according to the mode switching signal.

Preferably, the frequency conversion part includes:

the first frequency converter is used for forming a variable frequency power supply loop of the first yaw motor, and the variable frequency power supply loop of the first yaw motor is connected with a direct-throw power supply loop of the first yaw motor in parallel;

the second frequency converter is used for forming a variable frequency power supply loop of the second yaw motor, and the variable frequency power supply loop of the second yaw motor is connected with a direct-throw power supply loop of the second yaw motor in parallel;

the third frequency converter is used for forming a variable frequency power supply loop of a third yaw motor, and the variable frequency power supply loop of the third yaw motor is connected with a direct-throw power supply loop of the third yaw motor in parallel;

and the fourth frequency converter is used for forming a frequency conversion power supply loop of the fourth yaw motor, and the frequency conversion power supply loop of the fourth yaw motor is connected with the direct-throw power supply loop in parallel.

Preferably, the switching section includes:

the first circuit breaker is used for connecting/disconnecting an input three-phase power supply of the first frequency converter and tripping for protection when the input of the first frequency converter is over-current;

the second circuit breaker is used for connecting/disconnecting the input three-phase power supply of the second frequency converter and tripping for protection when the input overcurrent of the second frequency converter is input;

the third circuit breaker is used for connecting/disconnecting the input three-phase power supply of the third frequency converter and tripping for protection when the input overcurrent of the third frequency converter is input;

the fourth circuit breaker is used for connecting/disconnecting the input three-phase power supply of the fourth frequency converter and tripping for protection when the input overcurrent is input;

the first contactor is used for connecting/disconnecting a direct-throw power supply loop of the first yaw motor;

the second contactor is used for switching on/off a direct-throw power supply loop of the second yaw motor;

the third contactor is used for connecting/disconnecting a direct-throw power supply loop of the third yaw motor;

the fourth contactor is used for switching on/off a direct-throw power supply loop of the fourth yaw motor;

the fifth contactor is used for connecting/disconnecting the variable-frequency power supply loop of the first yaw motor;

the sixth contactor is used for connecting/disconnecting the variable-frequency power supply loop of the second yaw motor;

the seventh contactor is used for connecting/disconnecting the variable-frequency power supply loop of the third yaw motor;

the eighth contactor is used for switching on/off a variable-frequency power supply loop of the fourth yaw motor;

a ninth contactor for simultaneously switching on/off input three-phase power of the first circuit breaker, the second circuit breaker, the third circuit breaker and the fourth circuit breaker;

the tenth contactor is used for connecting/disconnecting a power supply loop and a signal loop of the hydraulic system and connecting/disconnecting a brake power supply loop of the first frequency converter, the second frequency converter, the third frequency converter and the fourth frequency converter;

a first intermediate relay for driving the first contactor, the second contactor, the third contactor and the fourth contactor according to a mode switching signal of the control part;

and a second intermediate relay for driving the fifth, sixth, seventh, eighth, ninth and tenth contactors according to the mode switching signal of the control part.

Preferably, the yawing system comprises a main control cabinet, a hydraulic system, a power supply breaker, a left yawing contactor, a right yawing contactor, a first yawing motor, a second yawing motor, a third yawing motor and a fourth yawing motor;

the hydraulic signal output end of the main control cabinet is connected with the control input end of a hydraulic system, the left yaw signal output end of the main control cabinet is connected with the input end of a normally closed auxiliary contact of a right yaw contactor, the output end of a normally closed auxiliary contact of the right yaw contactor is connected with a coil of the left yaw contactor, the right yaw signal output end of the main control cabinet is connected with the input end of a normally closed auxiliary contact of the left yaw contactor, the output end of a normally closed auxiliary contact of the left yaw contactor is connected with the coil of the right yaw contactor, the brake power supply end of the main control cabinet is connected with the input end of the normally closed auxiliary contact of the left yaw contactor, and the output end of the normally closed auxiliary contact of the left yaw contactor is connected with the input end;

defining in-phase connection as the A phase of the output end connected with the A phase of the input end, the B phase of the output end connected with the B phase of the input end, and the C phase of the output end connected with the C phase of the input end; defining the inverse connection as that A phase of the output end is connected with C phase of the input end, B phase of the output end is connected with B phase of the input end, and C phase of the output end is connected with A phase of the input end;

the input end of the power supply circuit breaker is connected with the output end of a three-phase power supply in phase, the output end of the power supply circuit breaker is connected with the input end of a left yawing contactor in reverse phase, the output end of the power supply circuit breaker is connected with the input end of a right yawing contactor in phase, the output end of the left yawing contactor is connected with the output end of the right yawing contactor in phase, the connection point of the output end of the left yawing contactor and the output end of the right yawing contactor is respectively connected with the input ends of a first motor protection circuit breaker, a second motor protection circuit breaker, a third motor protection circuit breaker and a fourth motor protection circuit breaker in phase, the output end of the first motor protection circuit breaker is connected with the input end of a first yawing motor in phase, an electromagnetic valve of the first yawing motor is connected with the output end of a normally-closed auxiliary contact of the right yawing, the electromagnetic valve of the second yaw motor is connected with the output end of the normally closed auxiliary contact of the right yaw contactor, the output end of the third motor protection circuit breaker is connected with the input end of the third yaw motor in phase, the electromagnetic valve of the third yaw motor is connected with the output end of the normally closed auxiliary contact of the right yaw contactor, the output end of the fourth motor protection circuit breaker is connected with the input end of the fourth yaw motor in phase, and the electromagnetic valve of the fourth yaw motor is connected with the output end of the normally closed auxiliary contact of the right yaw contactor.

Preferably, the power supply input end of the control part is used for being connected with the output end of the power supply circuit breaker in the same phase, the left yaw signal input end of the control part is used for being connected with the left yaw signal output end of the main control cabinet, the right yaw signal input end of the control part is used for being connected with the right yaw signal output end of the main control cabinet, the hydraulic signal input end of the control part is used for being connected with the hydraulic signal output end of the main control cabinet, and the signal output end of the control part is connected with the signal input ends of the frequency conversion part and the switch part.

Preferably, the frequency conversion part comprises a first frequency converter, a second frequency converter, a third frequency converter and a fourth frequency converter, and control power supply input ends of the first frequency converter, the second frequency converter, the third frequency converter and the fourth frequency converter are all used for being connected with a control power supply output end of the main control cabinet.

Preferably, the switching part includes first to fourth circuit breakers, first to tenth contactors, a first intermediate relay, and a second intermediate relay;

the input end of the ninth contactor is used for connecting the output ends of the power supply circuit breakers in the same phase, and the output end of the ninth contactor is respectively connected with the input ends of the first circuit breaker, the second circuit breaker, the third circuit breaker and the fourth circuit breaker in the same phase;

the output end of the first circuit breaker is connected with the input end of the first frequency converter in phase, the output end of the second circuit breaker is connected with the input end of the second frequency converter in phase, the output end of the third circuit breaker is connected with the input end of the third frequency converter in phase, and the output end of the fourth circuit breaker is connected with the input end of the fourth frequency converter in phase;

the input end of the first contactor is connected with the output end of the first motor protection circuit breaker in phase, the output end of the first contactor is connected with the input end of the first yaw motor in phase, the input end of the second contactor is connected with the output end of the second motor protection circuit breaker in phase, the output end of the second contactor is connected with the input end of the second yaw motor in phase, the input end of the third contactor is connected with the output end of the third motor protection circuit breaker in phase, the output end of the third contactor is connected with the input end of the third yaw motor in phase, the input end of the fourth contactor is connected with the output end of the fourth motor protection circuit breaker in phase, and the output end of the fourth contactor is connected with the input end of the fourth yaw motor in;

the input end of a fifth contactor is connected with the output end of the first frequency converter in the same phase, the input end of a normally open auxiliary contact of the fifth contactor is connected with the output end of the brake power supply of the first frequency converter, and the output end of the normally open auxiliary contact of the fifth contactor is connected with the electromagnetic valve of the first yaw motor; the input end of the sixth contactor is connected with the output end of the second frequency converter in the same phase, the input end of a normally open auxiliary contact of the sixth contactor is connected with the output end of the brake power supply of the second frequency converter, and the output end of the normally open auxiliary contact of the sixth contactor is connected with the electromagnetic valve of the second yaw motor; the input end of the seventh contactor is connected with the output end of the third frequency converter in the same phase, the input end of a normally open auxiliary contact of the seventh contactor is connected with the output end of the brake power supply of the third frequency converter, and the output end of the normally open auxiliary contact of the seventh contactor is connected with the electromagnetic valve of the third yaw motor; the input end of the eighth contactor is connected with the output end of the fourth frequency converter in the same phase, the input end of a normally open auxiliary contact of the eighth contactor is connected with the output end of the brake power supply of the fourth frequency converter, and the output end of the normally open auxiliary contact of the eighth contactor is connected with the electromagnetic valve of the fourth yaw motor;

the input end of a first normally closed auxiliary contact of the tenth contactor is used for being connected with the hydraulic signal output end of the main control cabinet, and the input end of the first normally closed auxiliary contact of the tenth contactor is used for being connected with the control input end of the hydraulic system; the input end of a second normally closed auxiliary contact of the tenth contactor is used for being connected with the brake power supply end of the main control cabinet, and the output end of the second normally closed auxiliary contact of the tenth contactor is respectively connected with the input ends of normally open auxiliary contacts of the first contactor, the second contactor, the third contactor and the fourth contactor; the input end of a first normally-open main contact of the tenth contactor is connected with the hydraulic signal output end of the control part, the output end of the first normally-open main contact of the tenth contactor is used for being connected with the control input end of the hydraulic system, and the output end of the first normally-open main contact of the tenth contactor is connected with the output end of a first normally-closed auxiliary contact of the tenth contactor;

the input end of a normally open contact of the first intermediate relay is used for being connected with the output end of a control power supply of the main control cabinet, the output end of the normally open contact of the first intermediate relay is connected with the input end of a normally open contact of the second intermediate relay, the input end of a normally closed contact of the first intermediate relay is connected with the output end of a normally closed contact of the second intermediate relay, the output end of the normally closed contact of the first intermediate relay is respectively connected with coils of the first contactor to the fourth contactor, and the control signal input end of the coil of the first intermediate relay is connected with the first control signal output end of the control part;

the input end of a normally closed contact of the second intermediate relay is used for being connected with the output end of a control power supply of the main control cabinet, the output end of a normally open contact of the second intermediate relay is connected with coils of the fifth contactor to the tenth contactor, and the control signal input end of the coil of the second intermediate relay is connected with the second control signal output end of the control part.

A wind turbine generator yaw system comprises the frequency conversion device.

The utility model has the advantages that:

(1) after the frequency conversion device of the utility model is embedded into the yaw system, the yaw system has a frequency conversion mode and a direct-throw mode at the same time, and the main control program of the engine room is not required to be changed, the soft start, the soft stop and the soft brake of the yaw motor can be realized only by using the yaw command of the inherent direct-throw mode, the current impact of the yaw motor and the damage of a speed reducer and a hydraulic system are reduced, and the direct-throw mode is switched back when the frequency conversion mode fails, so that the generated energy of a fan is ensured;

(2) the frequency conversion device of the utility model adopts a modularized one-by-one mode, the fault-tolerant design is flexible, when one frequency converter loop fails, the normal operation of a yaw system can still be ensured, and the modularized design is beneficial to the replacement of the failed frequency converter;

(3) the utility model discloses a frequency conversion device is under frequency conversion mode, and yaw motor adopts the flagging control of torque current, and given rotational speed instruction just descends when arbitrary yaw motor load is too big and reduces the load, realizes that four yaw motor loads are even fast, prolongs the life of motor and reduction gear.

Drawings

FIG. 1 is a block diagram of a conventional yaw system of a wind turbine;

FIG. 2 is a schematic diagram of the middle frequency conversion device of the present invention;

fig. 3 is a schematic diagram of a main circuit of the middle frequency conversion device of the present invention;

fig. 4 is a schematic view of yaw control of the middle frequency conversion device according to the present invention;

fig. 5 is a schematic view of the torque current droop control of the yaw motor according to the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-5, the present embodiment provides a wind turbine generator frequency conversion device and a yaw system:

example one

As shown in fig. 2, the variable frequency device of the wind turbine generator comprises a control part, a variable frequency part and a switch part, wherein the control part is respectively connected with the variable frequency part and the switch part, and the variable frequency part is connected with the switch part. The control part is used for being connected with a main control cabinet of the yaw system, receiving a yaw command of the main control cabinet and generating a motor driving command and a mode switching signal. The frequency conversion part is used for being connected with the main control cabinet, receiving a motor driving instruction sent by the control part and driving a yaw motor of the yaw system according to the motor driving instruction. The switch part is used for being connected with the main control cabinet, the yaw motor and a hydraulic system of the yaw system, receiving a mode switching signal sent by the control part, and switching a frequency conversion mode and a direct-throwing mode according to the mode switching signal.

Example two

In this embodiment, the frequency converter section includes a first frequency converter In1, a second frequency converter In2, a third frequency converter In3 and a fourth frequency converter In 4.

The first frequency converter In1 is used for forming a variable frequency power supply loop of the first yaw motor M1, and the variable frequency power supply loop of the first yaw motor M1 is connected In parallel with a direct-throw power supply loop thereof; the second frequency converter In2 is used for forming a variable frequency power supply loop of the second yaw motor M2, and the variable frequency power supply loop of the second yaw motor M2 is connected In parallel with a direct-throw power supply loop thereof; the third frequency converter In3 is used for forming a variable frequency power supply loop of the third yaw motor M3, and the variable frequency power supply loop of the third yaw motor M3 is connected In parallel with a direct-throw power supply loop thereof; the fourth inverter In4 is used to form a variable frequency power supply loop of the fourth yaw motor M4, and the variable frequency power supply loop of the fourth yaw motor M4 is connected In parallel with the direct-throw power supply loop.

The switch portion includes a first breaker QS1, a second breaker QS2, a third breaker QS3, a fourth breaker QS4, a first contactor KM1, a second contactor KM2, a third contactor KM3, a fourth contactor KM4, a fifth contactor KM5, a sixth contactor KM6, a seventh contactor KM7, an eighth contactor KM8, a ninth contactor KM9, a tenth contactor KM10, a first intermediate relay KA1, and a second intermediate relay KA 2.

The first circuit breaker QS1 is used for switching on/off an input three-phase power supply of the first frequency converter In1 according to a mode switching signal of the control part and tripping protection when the input overcurrent of the first frequency converter In 1; the second circuit breaker QS2 is used for switching on/off the input three-phase power supply of the second frequency converter In2 according to a mode switching signal of the control part, and tripping protection is carried out when the second frequency converter In2 inputs overcurrent; the third circuit breaker QS3 is used for switching on/off the input three-phase power supply of the third frequency converter In3 according to a mode switching signal of the control part, and tripping protection is performed when the third frequency converter In3 inputs overcurrent; the fourth circuit breaker QS4 is used to switch on/off the input three-phase power of the fourth inverter In4 according to a mode switching signal of the control part, and trip protection when the input overcurrent of the fourth inverter In 4.

The first contactor KM1 is used for switching on/off a direct-throw power supply loop of the first yaw motor M1 according to a mode switching signal of the control part; the second contactor KM2 is used for switching on/off a direct-throw power supply circuit of the second yaw motor M2 according to a mode switching signal of the control part; the third contactor KM3 is used for switching on/off a direct-throw power supply circuit of the third yaw motor M3 according to a mode switching signal of the control part; the fourth contactor KM4 is used for switching on/off a direct-throw power supply circuit of the fourth yaw motor M4 according to a mode switching signal of the control part; the fifth contactor KM5 is used for switching on/off a variable-frequency power supply loop of the first yaw motor M1 according to a mode switching signal of the control part; the sixth contactor KM6 is used for switching on/off a variable-frequency power supply loop of the second yaw motor M2 according to a mode switching signal of the control part; the seventh contactor KM7 is used for switching on/off a variable-frequency power supply loop of the third yaw motor M3 according to a mode switching signal of the control part; the eighth contactor KM8 is used for switching on/off a variable-frequency power supply loop of the fourth yaw motor M4 according to a mode switching signal of the control part; the ninth contactor KM9 is used to simultaneously turn on/off the input three-phase power of the first, second, third and fourth circuit breakers QS1, QS2, QS3 and QS4 according to a mode switching signal of the control part; the tenth contactor KM10 is used to switch on/off the power supply circuit and the signal circuit of the hydraulic system and the brake power supply circuit of the first inverter In1, the second inverter In2, the third inverter In3 and the fourth inverter In4 according to the mode switching signal of the control part.

The first intermediate relay KA1 is used for driving the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4 according to a mode switching signal of a control part; the second intermediate relay KA2 is used to drive the fifth contactor KM5, the sixth contactor KM6, the seventh contactor KM7, the eighth contactor KM8, the ninth contactor KM9, and the tenth contactor KM10 according to a mode switching signal of the control part.

EXAMPLE III

A variable frequency device of a wind turbine generator is used for being connected with a yaw system and comprises a control portion, a variable frequency portion and a switch portion.

As shown in fig. 1, the yaw system includes a main control cabinet, a hydraulic system, a power supply breaker QF01, a left yaw contactor KMO1, a right yaw contactor KMO2, a first yaw motor M1, a second yaw motor M2, a third yaw motor M3, and a fourth yaw motor M4.

The hydraulic signal output end of the main control cabinet is connected with the control input end of a hydraulic system, the left yaw signal output end of the main control cabinet is connected with the input end of the normally closed auxiliary contact of the right yaw contactor KMO2, the output end of the normally closed auxiliary contact of the right yaw contactor KMO2 is connected with the coil of the left yaw contactor KMO1, the right yaw signal output end of the main control cabinet is connected with the input end of the normally closed auxiliary contact of the left yaw contactor KMO1, the output end of the normally closed auxiliary contact of the left yaw contactor KMO1 is connected with the coil of the right yaw contactor KMO2, the brake power supply end of the main control cabinet is connected with the input end of the normally closed auxiliary contact of the left yaw contactor KMO1, and the output end of the normally closed auxiliary contact of the left yaw contactor KMO1 is connected with the input end of the normally closed.

The phase A of the input end of the power supply breaker QF01 is connected with the phase A of the output end of the three-phase power supply, the phase B of the input end of the power supply breaker QF01 is connected with the phase B of the output end of the three-phase power supply, the phase C of the input end of the power supply breaker QF01 is connected with the phase C of the output end of the three-phase power supply, the phase A of the output end of the power supply breaker QF01 is connected with the phase C of the input end of the left yaw contactor KMO1, the phase B of the output end of the power supply breaker QF01 is connected with the phase B of the input end of the left yaw contactor KMO1, the phase C of the output end of the power supply breaker QF01 is connected with the phase A of the input end of the left yaw contactor KMO1, the phase A of the output end of the power supply breaker QF01 is connected with the phase A of the input end of the right yaw contactor KMO2, the phase B of the output end of the.

The phase A of the output end of the left yaw contactor KMO1 is connected with the phase A of the output end of the right yaw contactor KMO2, and the connection points of the phase A are respectively connected with the phase A of the input ends of the first motor protection circuit breaker, the second motor protection circuit breaker, the third motor protection circuit breaker and the fourth motor protection circuit breaker.

The B phase of the output end of the left yaw contactor KMO1 is connected with the B phase of the output end of the right yaw contactor KMO2, and the connection points of the B phases are respectively connected with the B phases of the input ends of the first motor protection circuit breaker, the second motor protection circuit breaker, the third motor protection circuit breaker and the fourth motor protection circuit breaker.

The C phase of the output end of the left yaw contactor KMO1 is connected with the C phase of the output end of the right yaw contactor KMO2, and the connection points of the C phases are respectively connected with the C phases of the input ends of the first motor protection circuit breaker, the second motor protection circuit breaker, the third motor protection circuit breaker and the fourth motor protection circuit breaker.

The phase A of the output end of the first motor protection circuit breaker is connected with the phase W of the first yaw motor M1, the phase B of the output end of the first motor protection circuit breaker is connected with the phase V of the first yaw motor M1, and the phase C of the output end of the first motor protection circuit breaker is connected with the phase U of the first yaw motor M1.

The phase A of the output end of the second motor protection circuit breaker is connected with the phase W of the second yaw motor M2, the phase B of the output end of the second motor protection circuit breaker is connected with the phase V of the second yaw motor M2, and the phase C of the output end of the second motor protection circuit breaker is connected with the phase U of the second yaw motor M2.

The phase A of the output end of the third motor protection circuit breaker is connected with the phase W of the third yaw motor M3, the phase B of the output end of the third motor protection circuit breaker is connected with the phase V of the third yaw motor M3, and the phase C of the output end of the third motor protection circuit breaker is connected with the phase U of the third yaw motor M3.

The phase A of the output end of the fourth motor protection circuit breaker is connected with the phase W of the fourth yaw motor M4, the phase B of the output end of the fourth motor protection circuit breaker is connected with the phase V of the fourth yaw motor M4, and the phase C of the output end of the fourth motor protection circuit breaker is connected with the phase U of the fourth yaw motor M4.

The electromagnetic valve of the first yaw motor M1 is connected with the output end of the normally closed auxiliary contact of the right yaw contactor KMO2, the electromagnetic valve of the second yaw motor M2 is connected with the output end of the normally closed auxiliary contact of the right yaw contactor KMO2, the electromagnetic valve of the third yaw motor M3 is connected with the output end of the normally closed auxiliary contact of the right yaw contactor KMO2, and the electromagnetic valve of the fourth yaw motor M4 is connected with the output end of the normally closed auxiliary contact of the right yaw contactor KMO 2.

As shown in fig. 3 and 4, phase a of the power supply input of the control part is used for being connected with phase a of the output of the power supply breaker QF01, phase B of the power supply input of the control part is used for being connected with phase B of the output of the power supply breaker QF01, and phase C of the power supply input of the control part is used for being connected with phase C of the output of the power supply breaker QF 01. The left yaw signal input end of the control part is used for being connected with the left yaw signal output end of the main control cabinet, the right yaw signal input end of the control part is used for being connected with the right yaw signal output end of the main control cabinet, the hydraulic signal input end of the control part is used for being connected with the hydraulic signal output end of the main control cabinet, and the signal output end of the control part is connected with the signal input ends of the frequency conversion part and the switch part.

The control part is used for receiving three yaw control commands inherent to the main control cabinet, namely a left yaw command, a right yaw command, a high/low hydraulic command and a control power supply, carrying out logic control operation according to the received commands, and sending a yaw enabling signal, the left or right yaw command and a speed command to the frequency conversion part through RS485 communication; the first control signal output by the control unit is connected to the driving power supply of the first intermediate relay KA1 of the switch unit, and the second control signal output by the control unit is connected to the driving power supply of the second intermediate relay KA2 of the switch unit. The control unit also receives a closed state signal from the main control cabinet power supply breaker QF 01.

The frequency conversion part comprises a first frequency converter In1, a second frequency converter In2, a third frequency converter In3 and a fourth frequency converter In4, and control power supply input ends of the first frequency converter In1, the second frequency converter In2, the third frequency converter In3 and the fourth frequency converter In4 are all used for being connected with a control power supply output end of the main control cabinet.

The phase a of the input end of the ninth contactor KM9 is used for connecting with the phase a of the output end of the power supply breaker QF01, the phase B of the input end of the ninth contactor KM9 is used for connecting with the phase B of the output end of the power supply breaker QF01, and the phase C of the input end of the ninth contactor KM9 is used for connecting with the phase C of the output end of the power supply breaker QF 01; phase a of an output terminal of the ninth contactor KM9 is connected to phase a of input terminals of the first, second, third and fourth breakers QS1, QS2, QS3 and QS4, respectively, phase B of an output terminal of the ninth contactor KM9 is connected to phase B of input terminals of the first, second, third and fourth breakers QS1, QS2, QS3 and QS4, respectively, and phase C of an output terminal of the ninth contactor KM9 is connected to phase C of input terminals of the first, second, third and fourth breakers QS1, QS2, QS3 and QS4, respectively. The ninth contactor KM9 is used to switch on/off the three-phase AC400V supply between the first circuit breaker QS1, the second circuit breaker QS2, the third circuit breaker QS3 and the fourth circuit breaker QS4 and the supply circuit breaker QF 01.

The a phase of the output end of the first circuit breaker QS1 is connected with the a phase of the input end of the first frequency converter In1, the B phase of the output end of the first circuit breaker QS1 is connected with the B phase of the input end of the first frequency converter In1, and the C phase of the output end of the first circuit breaker QS1 is connected with the C phase of the input end of the first frequency converter In 1. The first circuit breaker QS1 is used to switch on/off the input three-phase power of the first inverter In1 and trip protection when the input of the first inverter In1 is overcurrent.

The a phase of the output end of the second circuit breaker QS2 is connected with the a phase of the input end of the second frequency converter In2, the B phase of the output end of the second circuit breaker QS2 is connected with the B phase of the input end of the second frequency converter In2, and the C phase of the output end of the second circuit breaker QS2 is connected with the C phase of the input end of the second frequency converter In 2. The second circuit breaker QS2 is used to switch on/off the input three-phase power of the second inverter In2 and trip protection when the input of the second inverter In2 is overcurrent.

The a phase of the output end of the third circuit breaker QS3 is connected with the a phase of the input end of the third frequency converter In3, the B phase of the output end of the third circuit breaker QS3 is connected with the B phase of the input end of the third frequency converter In3, and the C phase of the output end of the third circuit breaker QS3 is connected with the C phase of the input end of the third frequency converter In 3. The third circuit breaker QS3 is used to switch on/off the input three-phase power of the third inverter In3 and trip protection when the input of the third inverter In3 is overcurrent.

The a phase of the output end of the fourth circuit breaker QS4 is connected with the a phase of the input end of the fourth frequency converter In4, the B phase of the output end of the fourth circuit breaker QS4 is connected with the B phase of the input end of the fourth frequency converter In4, and the C phase of the output end of the fourth circuit breaker QS4 is connected with the C phase of the input end of the fourth frequency converter In 4. The fourth circuit breaker QS4 is used to turn on/off the input three-phase power of the fourth inverter In4, and trip protection when the input of the fourth inverter In4 is overcurrent.

The phase a of the input end of the first contactor KM1 is connected with the phase a of the output end of the first motor protection circuit breaker, the phase B of the input end of the first contactor KM1 is connected with the phase B of the output end of the first motor protection circuit breaker, and the phase C of the input end of the first contactor KM1 is connected with the phase C of the output end of the first motor protection circuit breaker; the phase A of the output end of the first contactor KM1 is connected with the phase A of the input end of the first yaw motor M1, the phase B of the output end of the first contactor KM1 is connected with the phase B of the input end of the first yaw motor M1, and the phase C of the output end of the first contactor KM1 is connected with the phase C of the input end of the first yaw motor M1. The first contactor KM1 is used for isolating the first yaw motor M1 from the first motor protection breaker power supply and the electromagnetic brake power supply of the first yaw motor M1 loop in the direct-throw mode when the yaw system operates in the variable frequency mode.

The phase a of the input end of the second contactor KM2 is connected with the phase a of the output end of the second motor protection circuit breaker, the phase B of the input end of the second contactor KM2 is connected with the phase B of the output end of the second motor protection circuit breaker, and the phase C of the input end of the second contactor KM2 is connected with the phase C of the output end of the second motor protection circuit breaker; the phase A of the output end of the second contactor KM2 is connected with the phase A of the input end of the second yaw motor M2, the phase B of the output end of the second contactor KM2 is connected with the phase B of the input end of the second yaw motor M2, and the phase C of the output end of the second contactor KM2 is connected with the phase C of the input end of the second yaw motor M2. The second contactor KM2 is used for isolating the second yaw motor M2 from the second motor protection breaker power supply and the electromagnetic brake power supply of the second yaw motor M2 loop in the direct-throw mode when the yaw system operates in the variable frequency mode.

The phase a of the input end of the third contactor KM3 is connected with the phase a of the output end of the third motor protection circuit breaker, the phase B of the input end of the third contactor KM3 is connected with the phase B of the output end of the third motor protection circuit breaker, and the phase C of the input end of the third contactor KM3 is connected with the phase C of the output end of the third motor protection circuit breaker; the phase A of the output end of the third contactor KM3 is connected with the phase A of the input end of the third yaw motor M3, the phase B of the output end of the third contactor KM3 is connected with the phase B of the input end of the third yaw motor M3, and the phase C of the output end of the third contactor KM3 is connected with the phase C of the input end of the third yaw motor M3. The third contactor KM3 is used for isolating the third yaw motor M3 from the third motor protection breaker power supply and the electromagnetic brake power supply of the third yaw motor M3 loop in the direct-throw mode when the yaw system operates in the variable frequency mode.

The phase a of the input end of the fourth contactor KM4 is connected with the phase a of the output end of the fourth motor protection circuit breaker, the phase B of the input end of the fourth contactor KM4 is connected with the phase B of the output end of the fourth motor protection circuit breaker, and the phase C of the input end of the fourth contactor KM4 is connected with the phase C of the output end of the fourth motor protection circuit breaker; the phase A of the output end of the fourth contactor KM4 is connected with the phase A of the input end of the fourth yaw motor M4, the phase B of the output end of the fourth contactor KM4 is connected with the phase B of the input end of the fourth yaw motor M4, and the phase C of the output end of the fourth contactor KM4 is connected with the phase C of the input end of the fourth yaw motor M4. The fourth contactor KM4 is used for isolating the fourth yaw motor M4 from the fourth motor protection breaker power supply and the electromagnetic brake power supply of the fourth yaw motor M4 loop in the direct-throw mode when the yaw system operates in the variable frequency mode.

The A phase of the input end of the fifth contactor KM5 is connected with the A phase of the output end of the first frequency converter In1, the B phase of the input end of the fifth contactor KM5 is connected with the B phase of the output end of the first frequency converter In1, the C phase of the input end of the fifth contactor KM5 is connected with the C phase of the output end of the first frequency converter In1, the input end of the normally open auxiliary contact of the fifth contactor KM5 is connected with the brake power supply output end of the first frequency converter In1, and the output end of the normally open auxiliary contact of the fifth contactor KM5 is connected with the solenoid valve of the first yaw motor M1. The fifth contactor KM5 is used for isolating the main loop supply and the electromagnetic brake supply of the first yaw motor M1 and the first frequency converter In1 when the yaw system operates In the direct throw mode.

The phase A of the input end of the sixth contactor KM6 is connected with the phase A of the output end of the second frequency converter In2, the phase B of the input end of the sixth contactor KM6 is connected with the phase B of the output end of the second frequency converter In2, the phase C of the input end of the sixth contactor KM6 is connected with the phase C of the output end of the second frequency converter In2, the input end of the normally open auxiliary contact of the sixth contactor KM6 is connected with the brake power supply output end of the second frequency converter In2, and the output end of the normally open auxiliary contact of the sixth contactor KM6 is connected with the solenoid valve of the second yaw motor M2. The sixth contactor KM6 is used to isolate the main loop supply and the electromagnetic brake supply of the second yaw motor M2 and the second frequency converter In2 when the yaw system is operating In the direct throw mode.

The A phase of the input end of the seventh contactor KM7 is connected with the A phase of the output end of the third frequency converter In3, the B phase of the input end of the seventh contactor KM7 is connected with the B phase of the output end of the third frequency converter In3, the C phase of the input end of the seventh contactor KM7 is connected with the C phase of the output end of the third frequency converter In3, the input end of the normally open auxiliary contact of the seventh contactor KM7 is connected with the brake power supply output end of the third frequency converter In3, and the output end of the normally open auxiliary contact of the seventh contactor KM7 is connected with the solenoid valve of the third yaw motor M3. The seventh contactor KM7 is used for isolating the main loop supply and the electromagnetic brake supply of the third yaw motor M3 and the third frequency converter In3 when the yaw system operates In the direct throw mode.

The phase a of the input end of the eighth contactor KM8 is connected with the phase a of the output end of the fourth frequency converter In4, the phase B of the input end of the eighth contactor KM8 is connected with the phase B of the output end of the fourth frequency converter In4, the phase C of the input end of the eighth contactor KM8 is connected with the phase C of the output end of the fourth frequency converter In4, the input end of the normally open auxiliary contact of the eighth contactor KM8 is connected with the brake power supply output end of the fourth frequency converter In4, and the output end of the normally open auxiliary contact of the eighth contactor KM8 is connected with the solenoid valve of the fourth yaw motor M4. The eighth contactor KM8 is used for isolating the main loop supply and the electromagnetic brake supply of the fourth yaw motor M4 and the fourth frequency converter In4 when the yaw system operates In the direct throw mode.

The input end of a first normally-closed auxiliary contact of the tenth contactor KM10 is used for being connected with the hydraulic signal output end of the main control cabinet, and the input end of a first normally-closed auxiliary contact of the tenth contactor KM10 is used for being connected with the control input end of a hydraulic system; the input end of a second normally-closed auxiliary contact of the tenth contactor KM10 is used for being connected with the brake power supply end of the main control cabinet, and the output end of the second normally-closed auxiliary contact of the tenth contactor KM10 is respectively connected with the input ends of normally-open auxiliary contacts of the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM 4; an input end of a first normally-open main contact of the tenth contactor KM10 is connected with a hydraulic signal output end of the control part, an output end of the first normally-open main contact of the tenth contactor KM10 is used for being connected with a control input end of a hydraulic system, and an output end of the first normally-open main contact of the tenth contactor KM10 is connected with an output end of a first normally-closed auxiliary contact of the tenth contactor KM 10.

The input end of the normally open contact of the first intermediate relay KA1 is used for being connected with the control power supply output end of the main control cabinet, the output end of the normally open contact of the first intermediate relay KA1 is connected with the input end of the normally open contact of the second intermediate relay KA2, the input end of the normally closed contact of the first intermediate relay KA1 is connected with the output end of the normally closed contact of the second intermediate relay KA2, the output end of the normally closed contact of the first intermediate relay KA1 is respectively connected with the coils of the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4, and the control signal input end of the coil of the first intermediate relay KA1 is connected with the first control signal output end of the control part. The input end of a normally closed contact of the second intermediate relay KA2 is used for being connected with the control power supply output end of the main control cabinet, the output end of a normally open contact of the second intermediate relay KA2 is connected with the coils of the fifth contactor KM5, the sixth contactor KM6, the seventh contactor KM7, the eighth contactor KM8, the ninth contactor KM9 and the tenth contactor KM10, and the control signal input end of the coil of the second intermediate relay KA2 is connected with the second control signal output end of the control part.

The operation process of the yawing system provided with the frequency conversion device of the embodiment is as follows:

step 1: at the initial moment, the first motor protection circuit breaker, the second motor protection circuit breaker, the third motor protection circuit breaker and the fourth motor protection circuit breaker of the direct-throw power supply circuit are kept in a closed state, the first circuit breaker QS1, the second circuit breaker QS2, the third circuit breaker QS3 and the fourth circuit breaker QS4 of the variable-frequency power supply circuit are kept in a closed state, and the first control signal and the second control signal output by the control part are both low level. According to the connection mode of the first intermediate relay KA1 and the second intermediate relay KA2, when the first driving signal output by the first intermediate relay KA1 is valid, the coil of the direct-throwing mode contact group (the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM 4) is immediately driven, so that the direct-throwing mode contact group is in a closed state, and the variable-frequency mode contact group (the fifth contactor KM5, the sixth contactor KM6, the seventh contactor KM7, the eighth contactor KM8, the ninth contactor KM9 and the tenth contactor KM 10) is in an open state, so that each variable-frequency power supply circuit is isolated from the corresponding yaw motor, and at this time, the yaw system is in a direct-throwing mode. If no yaw signal exists, the left yaw contactor KMO1 and the right yaw contactor KMO2 in the direct-casting mode are both in an off-state, so that each yaw motor is in a brake state, the hydraulic system is in a high hydraulic state, and the brake locking of the yaw system is ensured.

Step 2: when the power supply breaker QF01 is closed, the control part receives the closing state of the power supply breaker QF01 to trigger the starting command of the frequency conversion device, the first control signal output by the control part is immediately set to be high level, and the second control signal is maintained to be low level. According to the connection mode of the first intermediate relay KA1 and the second intermediate relay KA2, the first driving signal output by the first intermediate relay KA1 is invalid, and at this time, the direct-throw mode contact set is in the disconnection state, and the variable-frequency mode contact set is in the disconnection state. After 2s of delay from the reception of the closed state signal of the power supply breaker QF01, the first control signal output by the control unit maintains the high level and the second control signal is set to the high level, and it is known that the second drive signal output by the second intermediate relay KA2 is effective, and the coils of the inverter mode contact group are immediately driven, so that the inverter mode contact group is in the closed state and the direct throw mode contact group is in the open state, and each direct throw power supply circuit is isolated from the corresponding yaw motor, and at this time, the yaw system is in the inverter mode.

Step 3: due to the fact that the ninth contactor KM9 is closed, the first frequency converter In1, the second frequency converter In2, the third frequency converter In3 and the fourth frequency converter In4 enter a working state from a charging state, and the whole frequency conversion device is started completely when the main control cabinet sends an instruction.

Step 4: when the fan needs to yaw, the main control cabinet sends a left (or right) yaw command and a low hydraulic command to the control part at the same time, the control part outputs a low hydraulic driving command to the hydraulic system through the tenth contactor KM10 immediately after receiving the command, the hydraulic system is switched from high hydraulic pressure to low hydraulic pressure immediately, and the time is delayed by 1s from the receiving of the yaw command, so that the hydraulic system is ensured to be in the low hydraulic pressure. The control part sends a frequency conversion enabling signal and a rotating speed instruction to the frequency conversion part, wherein the frequency converter enabling signal triggers and blocks a yaw motor band-type brake power supply loop to loosen a motor band-type brake, 0.5s of delay is carried out to ensure that the yaw motor band-type brake is completely loosened, the soft start of the yaw motor is gradually accelerated from 0 to the rated rotating speed, and as the yaw system is in a low hydraulic state and the band-type brake of the yaw motor is completely loosened, the current impact of the yaw motor and the mechanical impact of a gear box are avoided; when the load is unbalanced after the yaw motor is started, the frequency converter automatically controls the yaw motor to finally achieve torque balance according to the droop of the torque current. As shown in fig. 5, if the load of one yaw motor is large, the torque current of the yaw motor is also large, and due to the droop mechanism, the speed command of the yaw motor is smaller than that of the other yaw motors, and the output rotating speed of the yaw motor is also smaller than that of the other yaw motors, so that the load is reduced, and finally, the moment balance of the yaw motors is achieved.

Step 5: when the yaw is finished to wind, the main control cabinet cancels a left (or right) yaw command and simultaneously sends a high hydraulic command to the control part, after the control part receives a yaw-free command and the high hydraulic command, the control part immediately sends a speed command 0 to the frequency conversion part through RS485, the yaw motors are slowly stopped according to the set deceleration, when the rotating speeds of the four yaw motors are all smaller than 50r/min, the time is delayed for 1s to ensure that the yaw motors are stopped stably, the control part outputs the high hydraulic command to transmit a hydraulic system through a tenth contactor KM10, the hydraulic system immediately changes from low hydraulic pressure to high hydraulic pressure, meanwhile, the control part cancels a frequency conversion enabling signal to the frequency conversion part, and after the frequency conversion enabling signal disappears, the frequency converter gradually opens a switching device to realize the soft band-type brake braking of the yaw motors. During the yaw stopping braking process, if the kinetic energy of the cabin is larger, the kinetic energy is consumed on the braking resistor of the frequency converter.

Step 6: if one frequency converter has a fault part in the frequency conversion mode operation process, the frequency conversion mode operation is influenced, and the three yaw motors can normally yaw and face the wind due to the load capacity. If at least two frequency converters have faults, the first control signal output by the control part is immediately set to be at a low level, the second control signal keeps at a high level, the second driving signal is invalid, the frequency conversion mode contact group is in a breaking state, the direct throw mode contact group is also in a breaking state, the time is delayed for 1s, the second control signal is set to be at a low level, the first control signal keeps at a low level, the yaw system is in a direct throw mode, and therefore when at least two frequency converters have faults, the yaw system is switched back to the direct throw mode, and the power generation amount is guaranteed.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a wind turbine generator system frequency conversion device which characterized in that includes:

Command and mode switching signals;

2. The wind turbine generator set frequency conversion device according to claim 1, wherein the frequency conversion part comprises:

3. The wind turbine generator set frequency conversion device according to claim 2, wherein the switch part comprises:

4. The variable frequency device of the wind turbine generator according to claim 1, wherein the yaw system comprises a main control cabinet, a hydraulic system, a power supply circuit breaker, a left yaw contactor, a right yaw contactor, a first yaw motor, a second yaw motor, a third yaw motor, a fourth;

5. The wind turbine generator frequency conversion device according to claim 4, wherein a power supply input end of the control portion is connected with an output end of a power supply breaker in phase, a left yaw signal input end of the control portion is connected with a left yaw signal output end of the main control cabinet, a right yaw signal input end of the control portion is connected with a right yaw signal output end of the main control cabinet, a hydraulic signal input end of the control portion is connected with a hydraulic signal output end of the main control cabinet, and a signal output end of the control portion is connected with signal input ends of the frequency conversion portion and the switch portion.

6. The wind turbine generator frequency conversion device according to claim 4, wherein the frequency conversion part comprises a first frequency converter, a second frequency converter, a third frequency converter and a fourth frequency converter, and control power supply input ends of the first frequency converter, the second frequency converter, the third frequency converter and the fourth frequency converter are all used for being connected with a control power supply output end of the main control cabinet.

7. The wind turbine generator set frequency conversion device according to claim 3, wherein the switch part comprises first to fourth circuit breakers, first to tenth contactors, a first intermediate relay and a second intermediate relay;

8. A wind turbine yaw system comprising a frequency conversion device according to any one of claims 1 to 7.