CN106338689B - A kind of synchronous motor excitation system operating status self checking method - Google Patents
A kind of synchronous motor excitation system operating status self checking method Download PDFInfo
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- CN106338689B CN106338689B CN201610755363.5A CN201610755363A CN106338689B CN 106338689 B CN106338689 B CN 106338689B CN 201610755363 A CN201610755363 A CN 201610755363A CN 106338689 B CN106338689 B CN 106338689B
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- excitation system
- voltage
- trigger angle
- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
Abstract
The invention discloses a kind of synchronous motor excitation system operating status self checking methods, it can be applied in the generator microcomputer excitation system of various types, by comparing the threshold value relationship calculated between Trigger Angle and true Trigger Angle, determine whether excitation system operating status is abnormal, and alert simultaneously switch operating channel in time to excitation system unusual service condition, the accident for leading to generator chaser because of excitation system service aisle failure can be prevented.
Description
Technical field
The present invention relates to a kind of synchronous motor excitation system operating status self checking methods.
Background technique
Excitation system is the core apparatus of generator set control, once excitation system breaks down, it will it seriously affects
The safe and stable operation of generator, with the growth of Chinese large-sized generating set quantity, for the reliability requirement of excitation system
Also higher and higher.
The core controller of excitation system is commonly provided with double sets, and rectifier bridge is also equipped with redundancy, once event occurs for excitation system
Barrier controller can be switched to from main set from set automatically, and rectifier bridge can cut off fault branch, so that it is normal not influence generator
Operation, therefore excitation system fault detection runs engine health particularly important.
Be mainly at present to be detected to important module for the fault detection of excitation system, mainly include PT disconnection fault,
Pulse readback failure, synchronizing voltage failure, power failure, adjuster plate failure, silicon-controlled failure, fan trouble etc..Due to
There are many device included by excitation system, be difficult to accomplish to the state of all devices can accurate judgement, therefore repeatedly encourage
Magnetic system failure fails to judge in time and lead to the accident out of control for then causing generator chaser.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of synchronous motor excitation system operating status is provided
Self checking method solves excitation system fault detection in the prior art and only detects to important module, and testing result is not accurate enough,
Excitation system failure cannot be judged in time and leads to the technical issues of then causing generator chaser accident out of control.
In order to solve the above technical problems, the technical scheme adopted by the invention is that：A kind of synchronous motor excitation system operation
State self checking method determines that field regulator exports pulse-triggered angle αjsWhether true Trigger Angle α is belonged totrWith rotor current pair
Answer section [αtrmin, αtrmax], when detectingIt is denoted as initial time t0, time constant t is setr, in tr
If in the time alwaysThen it is determined as that excitation system is operating abnormally.
Specific self checking method includes the following steps：
Step 1：Double set field regulators detect motor actual stator voltage under automatic voltage shaping modes, according to fixed
Sub- voltage percentage value and voltage give setting value relationship, export pulse-triggered angle αjs, realize voltage close loop control；
Step 2：Rotor is provided in the unit test parameters provided by main engine plants and directly hinders temperature characteristic parameter, is obtained
Specified radiating condition lower rotor part directly hinders nominal section
Step 3：Field regulator samples actual synchronization voltage UTWith rotor current Irot, rotor current takes alternating current to change
It calculates, takes three-phase current maximum value, and be based on unit nominal parameter, obtain synchronizing voltage nominal value corresponding with rotor currentWithBy formulaObtain true Trigger Angle αtr；
Step 4：Nargin coefficient δ is set, is takenBy formulaWithReal-time true Trigger Angle is obtained with rotor current pair
Answer section [αtrmin, αtrmax] curve graph；
Step 5：Determine that field regulator exports pulse-triggered angle αjsWhether section [α is belonged totrmin, αtrmax], work as detection
It arrivesIt is denoted as initial time t0, time constant t is setr, in trIf in the time alwaysThen it is determined as that excitation system is operating abnormally, enters step six, carries out anomaly analysis judgement；
Step 6：When field regulator detects voltage transformer disconnection failure and synchronizing voltage three-phase imbalance, move back
Excitation system operating status self-test out；
Field regulator samples stator voltage and stator current, meets the specified stator voltage that stator voltage is greater than 90%,
When stator current is greater than 5% rated secondary current, motor operation is determined in load state, state self-test is abnormal, then excitation system
It is switched to from set and runs, while field regulator alerts；Otherwise, it is determined that motor operation is in unloaded state, state self-test is abnormal, then encourages
Magnestat inversion field suppression.
It is also provided with stagnant ring coefficient lambda, state self-test is eliminated and outputs shake：
When calculating Trigger Angle becomes larger, α need to be metjs>αtrmax+ λ determines that excitation system is operating abnormally；
When calculating Trigger Angle gradually becomes smaller, α need to be metjs<αtrmax, exit excitation system and be operating abnormally state；
Similarly, when calculating Trigger Angle gradually becomes smaller, α need to be metjs<αtrmin- λ determines excitation system operation
It is abnormal；
When calculating Trigger Angle becomes larger, α need to be metjs>αtrmin, exit excitation system and be operating abnormally state.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being：
(1) with the comformity relation self-test excitation system between true Trigger Angle and field regulator output pulse-triggered angle
Operating status, and alert in time to excitation system unusual service condition and switch operating channel, testing result is accurate, can prevent in time because
Excitation system service aisle failure and the accident for leading to generator chaser；
(2) nargin coefficient δ adjusting can be achieved synchronous motor excitation system operating status self-detection result correctness with can
By property；
(3) adjusting of stagnant ring coefficient lambda increases the stability that movement is outputed in synchronous motor excitation system operating status self-test.
Detailed description of the invention
Fig. 1 is the structural block diagram of representative synchronization motor excitation system in the present invention.
Fig. 2 is that representative synchronization rotor directly hinders temperature characteristic curve graph in the present invention.
Fig. 3 is that true Trigger Angle and synchronizing voltage be nominal and the nominal three-dimensional relationship figure of rotor current in the present invention.
Fig. 4 is the graph of relation that angle range bound Yu rotor nominal current are really triggered in the present invention.
Fig. 5 is that decision condition figure is outputed in the self-test of synchronous motor excitation system operating status in the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
It is a kind of typical generator microcomputer excitation system topology diagram referring to Fig. 1, the operation principle of the present invention is that：
In the synchronous motor excitation system, it is practical fixed that field regulator is adjusted under closed loop control mode by output pulse-triggered angle
Sub- voltage or actual rotor current tracking are corresponding to target value, and it is to calculate Trigger Angle that field regulator, which exports pulse-triggered angle,
αjs.Meanwhile field regulator is based on three-phase full-controlled rectifier bridge model by sample-synchronous voltage and actual rotor electric current, by public affairs
FormulaObtain the true Trigger Angle α of excitation systemtr.Consider in error tolerance band, calculates Trigger Angle αjs
With true Trigger Angle αtrIt answers almost the same, is determined as synchronous motor excitation system normal operation.A kind of synchronization disclosed by the invention
Motor excitation system running state self checking method, can be applied in the generator microcomputer excitation system of various types, judges excitation
Whether conditioner operation state is abnormal.
Correspondingly, double set field regulators detect motor actual stator voltage under automatic voltage shaping modes, according to fixed
Sub- voltage percentage value and voltage give setting value relationship, realize voltage close loop control, export pulse-triggered angle αjs。
Referring to fig. 2, temperature characteristic curve graph is directly hindered for representative synchronization rotor.Pass through host test parameters in the present invention
It obtains rotor and directly hinders temperature characteristic parameter, obtain specified radiating condition lower rotor part and directly hinder nominal section
Referring to Fig. 3, be true Trigger Angle and synchronizing voltage nominally and the nominal three-dimensional relationship figure of rotor current, it is of the invention in encourage
Magnestat real-time sampling actual synchronization voltage UTWith rotor current Irot, rotor current takes alternating current to convert, takes three-phase current
Maximum value.And it is based on unit nominal parameter, obtain synchronizing voltage nominal value corresponding with rotor currentWithBy formulaObtain true Trigger Angle αtr。
It referring to fig. 4, is the graph of relation of true triggering angle range bound and rotor nominal current.It is guarantor in the present invention
It is reliable to hinder the self-test of excitation system state, nargin coefficient δ is set.It takes
By formulaWithReal-time true Trigger Angle is obtained with rotor
Electric current corresponds to section [αtrmin, αtrmax] curve graph.
Correspondingly, determine that field regulator exports pulse-triggered angle αjsWhether section [α is belonged totrmin, αtrmax], work as detection
It arrivesIt is denoted as initial time t0, time constant t is setr, in trTrigger Angle α is repeatedly determined in timejsIt is
It is no to belong to section [αtrmin, αtrmax], if alwaysThen it is determined as that field regulator is operating abnormally, is considered as
Motor excitation running mode is not by field regulator closed-loop control, the judgement of further progress anomaly analysis：
When field regulator detects voltage transformer disconnection failure and synchronizing voltage three-phase imbalance, excitation system is exited
System operating status self-test；
Field regulator samples stator voltage and stator current, meets the specified stator voltage that stator voltage is greater than 90%,
When stator current is greater than 5% rated secondary current, motor operation is determined in load state, state self-test is abnormal, then excitation system
It is switched to from set and runs, while field regulator alerts；Otherwise, it is determined that motor operation is in unloaded state, state self-test is abnormal, then encourages
Magnestat inversion field suppression.
Referring to Fig. 5, shake is outputed to eliminate state self-test, the present invention also sets up stagnant ring coefficient lambda.When calculate Trigger Angle gradually
When becoming larger, α need to be metjs>αtrmax+ λ determines that excitation system is operating abnormally；When calculating Trigger Angle gradually becomes smaller, α need to be metjs<
αtrmax, exit excitation system and be operating abnormally state；Similarly, when calculating Trigger Angle gradually becomes smaller, α need to be metjs<αtrmin- λ sentences
Determine excitation system operation exception；When calculating Trigger Angle becomes larger, α need to be metjs>αtrmin, exit excitation system operation exception
State.Calculating Trigger Angle is the closed-loop control pulse output angle after field regulator is compensated, i.e. αjs。
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of synchronous motor excitation system operating status self checking method, which is characterized in that determine that field regulator exports pulse
Trigger Angle αjsWhether true Trigger Angle α is belonged totrSection [α is corresponded to rotor currenttrmin, αtrmax], when detectingIt is denoted as initial time t0, time constant t is setr, in trIf in the time alwaysThen it is determined as that excitation system is operating abnormally.
2. synchronous motor excitation system operating status self checking method according to claim 1, which is characterized in that specific self-test
Method includes the following steps：
Step 1：Double set field regulators detect motor actual stator voltage under automatic voltage shaping modes, according to stator electricity
It presses percentage value and voltage to give setting value relationship, exports pulse-triggered angle αjs, realize voltage close loop control；
Step 2：Rotor is provided in the unit test parameters provided by main engine plants and directly hinders temperature characteristic parameter, is obtained specified
Radiating condition lower rotor part directly hinders nominal section
Step 3：Field regulator samples actual synchronization voltage UTWith rotor current Irot, rotor current takes alternating current to convert, takes
Three-phase current maximum value, and it is based on unit nominal parameter, obtain synchronizing voltage nominal value corresponding with rotor currentWithBy
FormulaObtain true Trigger Angle αtr；
Step 4：Nargin coefficient δ is set, is takenBy formulaWithReal-time true Trigger Angle is obtained with rotor current pair
Answer section [αtrmin, αtrmax] curve graph；
Step 5：Determine that field regulator exports pulse-triggered angle αjsWhether section [α is belonged totrmin, αtrmax], when detectingIt is denoted as initial time t0, time constant t is setr, in trIf in the time alwaysThen it is determined as that excitation system is operating abnormally, enters step six, carries out anomaly analysis judgement；
Step 6：When field regulator detects voltage transformer disconnection failure and synchronizing voltage three-phase imbalance, exits and encourage
Magnetic system operating status self-test；
Field regulator samples stator voltage and stator current, meets the specified stator voltage that stator voltage is greater than 90%, stator
When electric current is greater than 5% rated secondary current, motor operation is determined in load state, state self-test is abnormal, then excitation system switches
It is run to from set, while field regulator alerts；Otherwise, it is determined that motor operation is in unloaded state, state self-test is abnormal, then Excitation Adjustment
Save device inversion field suppression.
3. synchronous motor excitation system operating status self checking method according to claim 2, which is characterized in that be also provided with
Stagnant ring coefficient lambda eliminates state self-test and outputs shake：
When calculating Trigger Angle becomes larger, α need to be metjs>αtrmax+ λ determines that excitation system is operating abnormally；
When calculating Trigger Angle gradually becomes smaller, α need to be metjs<αtrmax, exit excitation system and be operating abnormally state；
Similarly, when calculating Trigger Angle gradually becomes smaller, α need to be metjs<αtrmin- λ determines that excitation system is operating abnormally；
When calculating Trigger Angle becomes larger, α need to be metjs>αtrmin, exit excitation system and be operating abnormally state.
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| CN201610755363.5A CN106338689B (en) | 2016-08-26 | 2016-08-26 | A kind of synchronous motor excitation system operating status self checking method |
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| CN201610755363.5A CN106338689B (en) | 2016-08-26 | 2016-08-26 | A kind of synchronous motor excitation system operating status self checking method |
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| CN106338689B true CN106338689B (en) | 2018-11-30 |
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| CN108776302A (en) * | 2018-02-01 | 2018-11-09 | 哈尔滨理工大学 | Motor bench experimental provision based on CAN bus and load control method |
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| JP2004282914A (en) * | 2003-03-17 | 2004-10-07 | Japan Servo Co Ltd | Driver of stepping motor |
| CN201156717Y (en) * | 2008-01-11 | 2008-11-26 | 西安理工大学 | Dual-computer field excitation regulator failure detection and automatic switching apparatus base on DSP |
| CN201689147U (en) * | 2010-06-01 | 2010-12-29 | 湖北省电力试验研究院 | Device for monitoring triggering angle of rectifier bridge of thyristor |
| CN201740855U (en) * | 2010-06-01 | 2011-02-09 | 湖北省电力试验研究院 | On-line multifunctional monitoring device of generator excited system |
| CN203376451U (en) * | 2013-04-02 | 2014-01-01 | 国家电网公司 | Excitation system open-loop characteristic tester |
| CN204009010U (en) * | 2014-07-28 | 2014-12-10 | 长江三峡能事达电气股份有限公司 | A kind of generator excitation intelligent online monitoring diagnosis device |
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2016
- 2016-08-26 CN CN201610755363.5A patent/CN106338689B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004282914A (en) * | 2003-03-17 | 2004-10-07 | Japan Servo Co Ltd | Driver of stepping motor |
| CN201156717Y (en) * | 2008-01-11 | 2008-11-26 | 西安理工大学 | Dual-computer field excitation regulator failure detection and automatic switching apparatus base on DSP |
| CN201689147U (en) * | 2010-06-01 | 2010-12-29 | 湖北省电力试验研究院 | Device for monitoring triggering angle of rectifier bridge of thyristor |
| CN201740855U (en) * | 2010-06-01 | 2011-02-09 | 湖北省电力试验研究院 | On-line multifunctional monitoring device of generator excited system |
| CN203376451U (en) * | 2013-04-02 | 2014-01-01 | 国家电网公司 | Excitation system open-loop characteristic tester |
| CN204009010U (en) * | 2014-07-28 | 2014-12-10 | 长江三峡能事达电气股份有限公司 | A kind of generator excitation intelligent online monitoring diagnosis device |
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