CN103308857B - Generator rotating rectifier pick-up unit and detection method - Google Patents
Generator rotating rectifier pick-up unit and detection method Download PDFInfo
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- CN103308857B CN103308857B CN201310282483.4A CN201310282483A CN103308857B CN 103308857 B CN103308857 B CN 103308857B CN 201310282483 A CN201310282483 A CN 201310282483A CN 103308857 B CN103308857 B CN 103308857B
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Abstract
The invention discloses a kind of generator rotating rectifier pick-up unit and detection method, be applicable to brushless excitation generator, this brushless excitation generator comprises the energized circuit for generating excitation field, and is located on generator amature for excitation AC is converted to galvanic rotating rectifier; This pick-up unit comprises Harmonic Detection module and harmonic analysis instrument; Harmonic Detection module is located on energized circuit, for detecting the harmonic signal that energized circuit induction generates; Harmonic analysis instrument, is connected with the output terminal of Harmonic Detection module, and the harmonic signal for detecting according to Harmonic Detection module judges the malfunction of rotating rectifier.Pick-up unit of the present invention and detection method are by utilizing the harmonic signal in Harmonic Detection module detection energized circuit, and utilize the number of times of this harmonic signal harmonic component to judge whether rotating rectifier breaks down, thus achieve the on-line checkingi of faults in rotating rectifiers state in brushless excitation generator.
Description
Technical field
The present invention relates to brushless excitation generator field, especially, relate to a kind of generator rotating rectifier pick-up unit for brushless excitation generator and detection method.
Background technology
Traditional gas-turbine generator set adopts special DC exciter, and DC exciter and synchronous generator are two independent parts, but needs coaxial installation.The field copper of synchronous generator obtains direct supply by dress slip ring on the rotary shaft and fixed brush from exciter, and this generator does not relate to rotating rectifier.
Gas-turbine generator set after improvement adopts brushless excitation generator, and in fact brushless excitation generator adopts two generators to form, wherein, one as AC exciter, another is as generator.On the rotor that the field copper of the armature winding of AC exciter, rotating rectifier and generator is all located at generator and coaxial rotating, without any need for the contact such as slip ring and brush between them.Due to rotating rectifier High Rotation Speed, commutation diode as the core component of rotating rectifier needs to bear very large centrifugal action, and be operated at a high speed, under the workplace of high temperature and vibration, also can run into superpotential, excess current and other abnormal conditions, commutation diode may suffer damage, and failure rate is higher.And once rotating rectifier breaks down and do not process in time, whole exciter will be caused to burn, generator cannot normally work.
Because the armature winding of rotating rectifier and AC exciter is installed on the rotor with generator; with outside without direct electrical contact, in order to detect rotating rectifier whether have a fault time, traditional detection method needs to shut down; pull down commutation diode from generator amature to detect, waste time and energy.Therefore, need badly a kind of pick-up unit for detecting faults in rotating rectifiers state is online provided.
Summary of the invention
The object of the invention is to provide a kind of generator rotating rectifier pick-up unit and detection method, cannot the technical matters of on-line checkingi to solve the existing rotating rectifier for brushless excitation generator.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of generator rotating rectifier pick-up unit, be applicable to brushless excitation generator, this brushless excitation generator comprises the energized circuit for generating excitation field, and is located on generator amature for excitation AC is converted to galvanic rotating rectifier; This pick-up unit comprises Harmonic Detection module and harmonic analysis instrument;
Harmonic Detection module is located on energized circuit, for detecting the harmonic signal that energized circuit induction generates;
Harmonic analysis instrument, is connected with the output terminal of Harmonic Detection module, and the harmonic signal for detecting according to Harmonic Detection module judges the malfunction of rotating rectifier.
Further, Harmonic Detection module is Hall magnetic test coil, and induced potential for detecting the induced potential in energized circuit, and is exported to harmonic analysis instrument by Hall magnetic test coil.
Further, rotating rectifier is three-phase bridge rectifier circuit.
Further, the generator unit stator of brushless excitation generator is provided with generator unit stator and adds winding, and the output terminal that generator unit stator adds winding is connected with the feeder ear of Harmonic Detection module.
Further, the output terminal that generator unit stator adds winding is connected with exciter excitation winding through field regulator, field regulator and exciter excitation winding excitation loop.
According to a further aspect in the invention, also provide a kind of and use above-mentioned generator rotating rectifier pick-up unit to carry out the method detected, comprise the following steps:
Harmonic Detection module detects the harmonic signal that energized circuit induction generates;
The overtone order of the harmonic signal that harmonic analysis instrument detects according to Harmonic Detection module judges the malfunction of rotating rectifier.
Further, harmonic analysis instrument judges whether harmonic signal is 6K time, and wherein, K is natural number; If so, then judge that rotating rectifier normally works; If not, then judge that rotating rectifier breaks down.
Further, harmonic signal is the induced potential that energized circuit induction generates.
The present invention has following beneficial effect:
Generator rotating rectifier pick-up unit of the present invention, by being provided with the Harmonic Detection module for detecting the harmonic signal that energized circuit induction generates on the energized circuit of AC exciter, Harmonic Detection module exports to harmonic analysis instrument by detecting the harmonic signal obtained, harmonic analysis instrument judges the malfunction of rotating rectifier according to the number of times of harmonic component in described harmonic signal, thus achieves the on-line checkingi of faults in rotating rectifiers state in brushless excitation generator.
Brushless excitation generator rotating rectifier detection method of the present invention, by utilizing the harmonic signal in Harmonic Detection module detection energized circuit, and judge whether rotating rectifier breaks down according to the number of times of harmonic component in this harmonic signal, thus achieve the on-line checkingi of faults in rotating rectifiers state in brushless excitation generator.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of preferred embodiment of the present invention brushless excitation generator rotating rectifier pick-up unit; And
Fig. 2 is the steps flow chart schematic diagram of preferred embodiment of the present invention brushless excitation generator rotating rectifier detection method.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The preferred embodiments of the present invention provide a kind of generator rotating rectifier pick-up unit, and for brushless excitation generator, with reference to Fig. 1, this brushless excitation generator comprises AC exciter 10 and generator 20.AC exciter 10 is provided with energized circuit 11 and armature of exciter winding 12, and generator 20 comprises generator amature 21 and generator unit stator 22, and generator amature 21 is provided with generator amature winding 23, and generator unit stator 22 is provided with generator unit stator main winding 24.Wherein:
Energized circuit 11, for generating excitation field, rotates for armature of exciter winding 12 and produces alternating current in excitation field;
Armature of exciter winding 12, to be located on generator amature 21 and to connect generator amature winding 23 through rotating rectifier 30; In the present embodiment, rotating rectifier 30 is the three-phase bridge rectifier circuit be made up of commutation diode, and the three-phase alternating current that armature of exciter winding 12 produces is converted to direct current through rotating rectifier 30 and exports to generator amature winding 23.Generator amature winding 23 generates excitation field as the field copper of generator 20, and the generator unit stator main winding 24 be located on generator unit stator 22 generates three-phase alternating current and exports electric energy in the excitation field of change.
Because rotating rectifier 30 is three-phase bridge fully controlled rectifier structures, rotating rectifier 30 can produce harmonic component on the armature of exciter winding 12 of AC exciter 10, answered by spatial impression, in the energized circuit 11 of AC exciter 10, also produce corresponding harmonic component.Because the armature of exciter winding 12 of AC exciter 10 connects for Y shape, there is no center line, therefore do not exist 3 times and multiple subharmonic current.During normal operation, in armature supply, there is no direct current and even harmonics component.Therefore only contain 6K ± 1 subharmonic current in three-phase full-bridge controlled rectifier, higher harmonic current produces fundamental magnetic potential and 6K ± 1 time higher hamonic wave magnetic potential together with fundamental current in armature of exciter winding 12.Because space harmonics magnetic potential cuts the exciter excitation winding 111 that it is arranged in energized circuit 11, produce induced potential.Positive sequence fundamental magnetic potential not induced potential, harmonic magnetic potential induction in 6K ± 1 generates stronger 6K subharmonic electromotive force.And 6K induced potential reduces gradually along with K increases, wherein, K is natural number.Therefore the fundamental magnetic potential that produces of 6 overtones band electromotive forces mainly produced by fundamental current five times, the seventh harmonic magnetic potential and five times, the seventh harmonic electric current respond to and produce.Therefore rotating rectifier 30 is when normally working, the induced potential signal that energized circuit 11 is responded to generation is 6K rd harmonic signal.When in rotating rectifier 30, commutation diode breaks down, the structure of rectification circuit will change, major harmonic component in the armature of exciter winding 12 of therefore AC exciter 10 will be no longer 6K ± 1 subharmonic, thus the induced harmonics electromotive force responding to generation in energized circuit 11 also can not again based on 6K.Harmonic Detection module 50 now by arranging on energized circuit 11 for detecting harmonic signal in energized circuit 11, the output terminal of Harmonic Detection module 50 connects harmonic analysis instrument 60, and harmonic analysis instrument 60 judges the malfunction of rotating rectifier 30 according to the harmonic component that Harmonic Detection module 50 detects.When maximum order harmonic components is 6K time, judge that rotating rectifier 30 is working properly; The harmonic component detected is 1 or 2 time, then illustrate that single spur track fault appears in rotating rectifier 30, thus achieve the on-line checkingi of rotating rectifier 30 malfunction in generator.
In the present embodiment, Harmonic Detection module 50 is Hall magnetic test coil, and Hall magnetic test coil detects the induced potential in energized circuit 11, and induced potential is exported to harmonic analysis instrument 60.Preferably, generator unit stator 22 is also provided with generator unit stator and adds winding 25, generator unit stator adds winding 25 output terminal and is connected with the feeder ear of Harmonic Detection module 50, thus eliminates the additional power source of Harmonic Detection module 50.Generator unit stator adds winding 25 output terminal and connects exciter excitation winding 111 through field regulator 40, and field regulator 40 and exciter excitation winding 111 form the energized circuit 11 of the present embodiment.Like this; utilize the collection of the voltage signal of the outgoing side of field regulator 40 pairs of generator unit stators 22; field regulator 40 is made to follow voltage on the Voltage Cortrol energized circuit 11 of generator 20 outgoing side; ensure that the constant of generator 20 output voltage; thus protect normal electricity consumption facility, avoid because appliance is burnt in under-voltage or overvoltage.
According to a further aspect in the invention, a kind of generator rotating rectifier detection method is additionally provided, for the fault detect to the rotating rectifier 30 be used on brushless excitation generator.With reference to Fig. 1, this brushless excitation generator comprises AC exciter 10 and generator 20, AC exciter 10 is provided with energized circuit 11 and armature of exciter winding 12, generator 20 comprises generator amature 21 and generator unit stator 22, generator amature 21 is provided with generator amature winding 23, and generator unit stator 22 is provided with generator unit stator main winding 24; Armature of exciter winding 12 to be located on generator amature 21 and to be connected generator amature winding 23 through rotating rectifier 30.With reference to Fig. 2, this detection method comprises the following steps:
Step S10, detects the harmonic signal in energized circuit 11;
In the present embodiment, employing Harmonic Detection module 50 detects the harmonic signal in energized circuit 11, and preferably, Harmonic Detection module 50 is hall sensing coil, for detecting the induced potential in energized circuit 11.
Step S20, judge whether the harmonic component of harmonic signal is 6K time, wherein, K is natural number;
In the present embodiment, harmonic analysis instrument receives from the induced potential signal of Hall magnetic test coil, and whether analyze this induced potential signal be 6K time, and wherein, K is natural number.
Step S30, if then judge that rotating rectifier 30 normally works;
When the induced potential signal in energized circuit 11 is 6K time, harmonic analysis instrument 60 judges that rotating rectifier 30 normally works.
Step S40, then judges that rotating rectifier 30 breaks down if not.
When the induced potential signal in energized circuit 11 is not 6K time, harmonic analysis instrument 60 judges that rotating rectifier 30 breaks down, and starts alerting signal and/or control genset shutdown work.
Generator rotating rectifier detection method of the present invention, harmonic signal in energized circuit 11 is detected by utilizing Harmonic Detection module 50, and the number of times of this harmonic signal harmonic component is to judge whether rotating rectifier 30 breaks down to utilize harmonic analysis instrument 60 to judge, thus achieve the on-line checkingi of rotating rectifier 30 malfunction in generator, to ensure the normal operation of genset.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a generator rotating rectifier pick-up unit, be applicable to brushless excitation generator, described brushless excitation generator comprises the energized circuit (11) for generating excitation field, and is located on generator amature (21) for excitation AC being converted to galvanic rotating rectifier (30); It is characterized in that, this pick-up unit comprises Harmonic Detection module (50) and harmonic analysis instrument (60);
Described Harmonic Detection module (50) is located on described energized circuit (11), for detecting the harmonic signal that described energized circuit (11) induction generates;
Described harmonic analysis instrument (60), be connected with the output terminal of described Harmonic Detection module (50), the harmonic signal for detecting according to described Harmonic Detection module (50) judges the malfunction of described rotating rectifier (30);
Described Harmonic Detection module (50) is Hall magnetic test coil, and described induced potential for detecting the induced potential in described energized circuit (11), and is exported to described harmonic analysis instrument (60) by described Hall magnetic test coil;
The generator unit stator (22) of described brushless excitation generator is provided with generator unit stator and adds winding (25), and the output terminal that described generator unit stator adds winding (25) is connected with the feeder ear of described Harmonic Detection module (50);
The output terminal that described generator unit stator adds winding (25) is connected with exciter excitation winding (111) through field regulator (40), and described field regulator (40) and described exciter excitation winding (111) form described energized circuit (11); Utilize described field regulator (40) to the collection of the voltage signal of the outgoing side of described generator unit stator (22), voltage on energized circuit (11) described in the Voltage Cortrol making described field regulator (40) follow generator (20) outgoing side, ensure that the constant of generator (20) output voltage.
2. generator rotating rectifier pick-up unit according to claim 1, is characterized in that,
Described rotating rectifier (30) is three-phase bridge rectifier circuit.
3. use the generator rotating rectifier pick-up unit according to any one of claim 1 to 2 to carry out the method detected, it is characterized in that, comprise the following steps:
Harmonic Detection module (50) detects the harmonic signal that energized circuit (11) induction generates;
The overtone order of the harmonic signal that harmonic analysis instrument (60) detects according to described Harmonic Detection module (50) judges the malfunction of described rotating rectifier (30).
4. method according to claim 3, is characterized in that,
Described harmonic analysis instrument (60) judges whether described harmonic signal is 6K time, and wherein, K is natural number; If so, then judge that described rotating rectifier (30) normally works; If not, then judge that described rotating rectifier (30) breaks down.
5. method according to claim 4, is characterized in that,
Described harmonic signal is the induced potential that described energized circuit (11) induction generates.
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| DE102016220235A1 (en) * | 2016-10-17 | 2018-04-19 | Seg Automotive Germany Gmbh | Detecting a fault in a generator unit |
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