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CN210564891U - Shutdown control system of wind generating set - Google Patents

Shutdown control system of wind generating set Download PDF

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Publication number
CN210564891U
CN210564891U CN201921552606.0U CN201921552606U CN210564891U CN 210564891 U CN210564891 U CN 210564891U CN 201921552606 U CN201921552606 U CN 201921552606U CN 210564891 U CN210564891 U CN 210564891U
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contactor
rotating speed
braking
relay
phase
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CN201921552606.0U
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Chinese (zh)
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张林岳
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Inner Mongolia Mufeng Power Technology Co Ltd
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Inner Mongolia Mufeng Power Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

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Abstract

The utility model provides a wind generating set shutdown control system, include: the device comprises a rotating speed relay, a contactor, a braking unit, an enabling relay and a maintenance switch; the rotating speed relay can close or open the contacts at different rotating speeds; the contactor is used for switching the brake unit; the braking unit is used for controlling the stop rotating speed of the generator; and the enabling relay and the maintenance switch are used for controlling whether the whole system is put into operation or not. The shutdown control system is additionally provided with the electric braking loop on the basis of the shutdown mode of the traditional wind generating set, so that the wind generating set can execute mechanical braking at a lower rotating speed of the generator, the impact of the set on a transmission chain in the braking shutdown process is effectively reduced, and the damage probability of a gear box is reduced. The utility model discloses a can use in deciding pitch wind generating set's shutdown control strategy, also can use in the backup protection of the shutdown inefficacy of becoming oar wind generating set, have the installation simple, move stable characteristics.

Description

Shutdown control system of wind generating set
Technical Field
The utility model relates to a wind power generation technical field especially relates to a wind generating set shutdown control system.
Background
At present, a wind generating set needs to be braked in the stopping process, for a fixed-pitch wind generating set, air braking is carried out in a mode that a blade tip pops out and rotates for a certain angle, and when a generator drops to a certain rotating speed (such as 500 revolutions per minute), the set is completely stopped in a mode that a high-speed brake caliper clamps a brake disc of a gear box.
The conventional fan stopping mode has certain defects that the fan cannot be completely stopped in an air braking mode, when a generator reaches a certain value, the rotating speed cannot be reduced any more, the rotating speed of the generator with the intervention of generally set mechanical braking is about 500 revolutions per minute, the generator is braked from 500 revolutions per minute to be static by a brake within a few seconds, and the impeller side still has large energy input, so that the impact on the tooth surface of a gear box is very large, tooth breakage and planet-level gear jamming are often caused, and even the low-speed level of the gear box is broken and disassembled. The risks of scrapping the gear box and galloping the unit are caused; on the other hand, the problems of high generator rotating speed, large abrasion loss of a brake pad of a high-speed brake, high temperature rise of the brake pad and the like cause increase of risks and maintenance cost when the brake is used for braking. The problem is also a difficult problem which puzzles wind power maintenance personnel, and an optimization scheme is urgently needed to solve the problem.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough to a simple structure, easily installation, operate steadily, strike little, with low costs, can effectively prolong gear box life's wind generating set shutdown control system is provided, it can optimize wind generating set shutdown process, has realized the unit and has strikeed little requirement at the steady deceleration of shutdown in-process to the gear box.
The utility model adopts the following technical scheme:
the wind generating set stop control system comprises a rotating speed relay, a contactor, a brake unit, an enabling relay and a maintenance switch, wherein,
the rotating speed relay has a rotating speed setting function, is connected with a rotating speed sensor signal from the generator, can close or open the contact at different rotating speeds, is used as an intermediate relay for respectively controlling the contactors, and is set into n groups;
the contactor is used for switching the braking units, comprises n alternating-current contactors and respectively controls n groups of braking units;
the braking unit is formed by connecting n groups of braking resistors or braking unit modules with certain electrical structures in series and is used for controlling the stopping rotating speed of the generator;
and the enabling relay and the maintenance switch are used for controlling whether the whole system is put into operation or not.
The utility model has the advantages that: 1. the utility model discloses a shutdown control system adds the electric brake through the in-process at pneumatic brake and mechanical brake when wind generating set shuts down, through insert the braking unit at the generator leading-out terminal, make the generator insert the load, load current will play the braking action to the generator, thereby make wind generating set can further reduce the rotational speed before mechanical brake, can reduce the damage probability and the driving risk of gear box through low-speed mechanical brake, reduce the operation maintenance cost, electric brake withdraws from the function through setting up the classification of braking unit under different motor speed, the motor speed is slower, the load is smaller, in order to keep the braking current relatively steady; 2. when the contact of the enabling relay and the maintenance switch are in a closed state at the same time, the control system is put into use, and when the fan is in maintenance, starting and running processes, a control loop of the control system is in a failure state and only works in the machine set stopping process; 3. by adding the control system of the utility model, a series of problems of instantaneous damage or even scrapping of the gear box of the propeller pitch unit caused by unit braking, unit runaway and the like can be effectively solved; 4. the utility model discloses still be applicable to the driving chain brake control who has the motor drive part that becomes oar wind generating set brake failure and other fields, needn't update former control program, only need introduce this utility model with relevant control signal and can realize, it is simple to have the installation, moves stable characteristics.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
FIG. 3 is a flow chart of the present invention;
in the figure:
S0-the rotational speed of the motor when off-line;
S1original execution of the unitThe generator rotating speed of mechanical braking is also the generator rotating speed at which the electric braking of the control strategy starts;
S2~Sn-controlling the generator speed at which the brake unit is stepped out;
s-the rotating speed of the generator with the quit of the electric braking and the intervention of the mechanical braking.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Embodiment 1 as shown in fig. 1, the wind generating set stop control system comprises a rotating speed relay, a contactor, a brake unit, an enabling relay and a maintenance switch, wherein,
the rotating speed relay has a rotating speed setting function, is connected with a rotating speed sensor signal from the generator, can close or open the contact at different rotating speeds, is used as an intermediate relay for respectively controlling the contactors, and is set into n groups;
the contactor is used for switching the braking units, comprises n alternating-current contactors and respectively controls n groups of braking units;
the braking unit is formed by connecting n groups of braking resistors or braking unit modules with certain electrical structures in series and is used for controlling the stopping rotating speed of the generator;
the enabling relay and the maintenance switch are used for controlling whether the whole system is put into operation or not;
the natural number n is more than or equal to 1, and specific numerical value setting is carried out according to the actual conditions of different units.
Example 2 as shown in fig. 2, the three-phase lead of the generator G is connected to the contactor KM via a blade fuse switch QS1The braking load adopts three-phase symmetrical load star connection, and the contactor KM1The main contact outlets are respectively connected with three-phase leading-out ends of braking loads, and each phase of the braking loads is provided with n braking units R1、R2、……、RnAre connected in series; contactor KM1The main contact outlets of the two contact units are also respectively connected with a contactor KM2、KM3、……、KMnMain contact incoming side of, KM2、KM3、……、KMnThe main contact outlet sides of the three-phase braking units are respectively connected with three phases of braking loads1And R2Meta, R2And R3M, … …, Rn-1And RnAnd contactor KM1U phase and contactor KM2The U-phase of contactor KM2 and the U-phase of contactor KM3 are connected with brake unit R1, R2, and so on, and contactor KMn-1U phase and contactor KMnU phase of (3) intermediate connection brake unit RnThe connection mode of V phase and W phase is the same as that of U phase, R phase1=R2=……=Rn
Contactor KM1Control coil A of1End pass connection rotating speed relay KS1The normally open contact of the contactor is connected with a power supply lead L and a contactor KM1Control coil A of2The end is connected with a power lead N, and the power lead L is connected with a rotating speed relay KS through a contact of an enabling relay and a contact of a maintenance switch1As a rotational speed relay KS1Power supply, speed relay KS1The other end is connected with a power supply lead N to form a loop, and a contactor KM2Control coil A of1End channel rotating speed relay KS2Normally open contact and contactor KM1A power supply lead L is connected to the back of the normally open auxiliary contact, and a contactor KM3Control coil A of1End channel rotating speed relay KS3Normally open contact and contactor KM1The normally open auxiliary contact is connected with a power supply lead L and so on, and a contactor KMnControl coil A of1End channel rotating speed relay KSnNormally open contact and contactor KM1A power supply lead L is connected to the back of the normally open auxiliary contact, and a contactor KM2、KM3、……、KMnControl coil A of2The ends of the power supply lead wire L are connected with a power supply lead wire N, and the power supply lead wire L is respectively connected with a rotating speed relay KS through a contact of an enabling relay and a contact of a maintenance switch2、KS3、……、KSnOne end of (1), a rotating speed relay KS2、KS3、……、KSnThe other ends of the two-way valve are connected with a power supply lead N to form a loop; one end of the enabling relay passes through the wind generating setThe stop control signal is connected with the power supply lead L, and the other end of the enabling relay is connected with the power supply lead N to form a loop.
The natural number n is more than or equal to 1, and specific numerical value setting is carried out according to the actual conditions of different units.
The enabling relay can selectively use a normally open contact or a normally closed contact according to the difference of stop control signals of different machine types, and only when the contact is closed, the control system is put into operation to ensure that the control system is in an exit state in the starting and running processes of the machine set.
The control function of the n rotating speed relays KS can also be realized by the programmable controller detecting the rotating speed signal and respectively sending out corresponding driving signals through program judgment.
KS1 is operable when the enable relay contact and the service switch contact are simultaneously in the closed position.
The working process of the utility model is that, as shown in figure 3, the mechanical brake of the unit is set to S rotation, and the generator is off-line at the stop process of the wind driven generator unit0When the rotating speed of the generator reaches S1(the generator speed of the machine set originally executing mechanical braking), entering the electric braking process, and a speed relay KS1Working, firstly putting n groups of braking units, contactor KM1The normally open auxiliary contact is closed and decreases with the rotation speed of the generator at the rotation speed S2、S3、……、SnIn turn by a speed relay KS2、KS3、……、KSnDrive contactor KM2、KM3、……、KMnSuccessively quitting the 1 st, 2 nd, … … th and n-1 th groups of brake units R1、R2、……、Rn-1So that the current generates a steady and continuous electromagnetic braking force in the motor, and when the rotating speed of the generator is reduced to S, the rotating speed relay KS1Withdrawing contactor KM1Breaking main contact and normally open auxiliary contact, n-th group of brake units RnAnd (5) exiting, and simultaneously executing mechanical braking of the brake calipers by the unit until the shutdown is finished. S1To SnAnd S is selected according to different modelsFeatures are determined and numerically S1>S2>S3……>Sn>S。

Claims (2)

1. Wind generating set shutdown control system, its characterized in that: comprises a rotating speed relay, a contactor, a brake unit, an enabling relay and a maintenance switch, wherein,
the rotating speed relay has a rotating speed setting function, is connected with a rotating speed sensor signal from the generator, can close or open the contact at different rotating speeds, is used as an intermediate relay for respectively controlling the contactors, and is set into n groups;
the contactor is used for switching the braking units, comprises n alternating-current contactors and respectively controls n groups of braking units;
the braking unit is formed by connecting n groups of braking resistors or braking unit modules with certain electrical structures in series and is used for controlling the stopping rotating speed of the generator;
the enabling relay and the maintenance switch are used for controlling whether the whole system is put into operation or not;
the natural number n is more than or equal to 1.
2. The wind turbine generator system shutdown control system of claim 1, wherein: the three-phase lead-out wire of the generator G is connected to a contactor KM through a knife type fuse switch QS1The braking load adopts three-phase symmetrical load star connection, and the contactor KM1The main contact outlets are respectively connected with three-phase leading-out ends of braking loads, and each phase of the braking loads is provided with n braking units R1、R2、……、RnAre connected in series; contactor KM1The main contact outlets of the two contact units are also respectively connected with a contactor KM2、KM3、……、KMnMain contact incoming side of, KM2、KM3、……、KMnThe main contact outlet sides of the three-phase braking units are respectively connected with three phases of braking loads1And R2Meta, R2And R3M, … …, Rn-1And RnAnd contactor KM1U phase and contactor KM2Is connected with the U phaseA braking unit R2 is connected among the braking unit R1, the U phase of the contactor KM2 and the U phase of the contactor KM3, and the like, and the contactor KM is usedn-1U phase and contactor KMnU phase of (3) intermediate connection brake unit RnThe connection mode of V phase and W phase is the same as that of U phase, R phase1=R2=……=Rn
Contactor KM1Control coil A of1End pass connection rotating speed relay KS1The normally open contact of the contactor is connected with a power supply lead L and a contactor KM1Control coil A of2The end is connected with a power lead N, and the power lead L is connected with a rotating speed relay KS through a contact of an enabling relay and a contact of a maintenance switch1As a rotational speed relay KS1Power supply, speed relay KS1The other end is connected with a power supply lead N to form a loop, and a contactor KM2Control coil A of1End channel rotating speed relay KS2Normally open contact and contactor KM1A power supply lead L is connected to the back of the normally open auxiliary contact, and a contactor KM3Control coil A of1End channel rotating speed relay KS3Normally open contact and contactor KM1The normally open auxiliary contact is connected with a power supply lead L, and the rest can be done in the same way, and the contactor KMnControl coil A of1End channel rotating speed relay KSnNormally open contact and contactor KM1A power supply lead L is connected to the back of the normally open auxiliary contact, and a contactor KM2、KM3、……、KMnControl coil A of2The ends of the power supply lead wire L are connected with a power supply lead wire N, and the power supply lead wire L is respectively connected with a rotating speed relay KS through a contact of an enabling relay and a contact of a maintenance switch2、KS3、……、KSnOne end of (1), a rotating speed relay KS2、KS3、……、KSnThe other ends of the two-way valve are connected with a power supply lead N to form a loop; one end of the enabling relay is connected with a power supply lead L through a stop control signal of the wind generating set, and the other end of the enabling relay is connected with a power supply lead N to form a loop.
CN201921552606.0U 2019-09-18 2019-09-18 Shutdown control system of wind generating set Active CN210564891U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921552606.0U CN210564891U (en) 2019-09-18 2019-09-18 Shutdown control system of wind generating set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921552606.0U CN210564891U (en) 2019-09-18 2019-09-18 Shutdown control system of wind generating set

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112952755A (en) * 2021-02-03 2021-06-11 西安热工研究院有限公司 Novel electric braking system with pure-resistance load for turbine generator set and protection coordination method
CN113513448A (en) * 2021-08-10 2021-10-19 天津明智润阳技术有限公司 Variable pitch brake control method for preventing wind generating set from galloping

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112952755A (en) * 2021-02-03 2021-06-11 西安热工研究院有限公司 Novel electric braking system with pure-resistance load for turbine generator set and protection coordination method
CN113513448A (en) * 2021-08-10 2021-10-19 天津明智润阳技术有限公司 Variable pitch brake control method for preventing wind generating set from galloping
CN113513448B (en) * 2021-08-10 2024-02-20 天津明智润阳技术有限公司 Variable-pitch brake control method for preventing galloping of wind generating set

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