CN103296952A - Parallel type excitation device with current feedback and controllable excitation functions - Google Patents
Parallel type excitation device with current feedback and controllable excitation functions Download PDFInfo
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- CN103296952A CN103296952A CN2013101886068A CN201310188606A CN103296952A CN 103296952 A CN103296952 A CN 103296952A CN 2013101886068 A CN2013101886068 A CN 2013101886068A CN 201310188606 A CN201310188606 A CN 201310188606A CN 103296952 A CN103296952 A CN 103296952A
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Abstract
The invention provides a parallel type excitation device with current feedback and controllable excitation functions. The parallel type excitation device comprises a regulator and a current transformer. A secondary-side winding of the current transformer is connected with a rectifier bridge, a pin F1 of the regulator is connected with a cathode of a silicon controlled rectifier and a positive end of direct-current output of the rectifier bridge, a pin G of the regulator is connected with a control electrode of the silicon controlled rectifier, a pin N of the regulator is connected with a negative end of the direct-current side output of the rectifier bridge, and a pin V of the regulator is connected with an anode of the silicon controlled rectifier. The parallel type excitation device has the advantages that when the parallel excitation device is used for exciting a power generator, excitation power can be quickly compensated or increased under the condition that an output end of the power generator is in short circuit or terminal voltage of the power generator drops substantially, short-circuit current holding ability is timely provided to the synchronous power generator, a power supply system is selectively protected, the dynamic stability of the power system is guaranteed, and the parallel excitation device is a novel excitation device with high excitation capacity and capability of meeting the requirement on short-circuit current holding ability.
Description
Technical field
The invention belongs to the generating equipment technical field, relate to a kind of excitation unit of synchronous generator, this excitation unit is used for synchronous generator exciting, specifically is a kind of current feedback and the parallel excitation unit of controlled excitation.
Background technology
Synchronous generator exciting mode and device thereof commonly used at present mainly contain: separate excitation device, permanent magnetism or composite excitation device, pilot exciter excitation unit, third harmonic excitation device, phase compound excitation excitation unit and static controlled excitation unit etc.Synchronous generator excitation equipment should have satisfactory forced exciting ability; namely when generator output end short circuit or terminal voltage plummet; excitation unit can compensate or increase exciting power rapidly, realizes the selective protection of electric power system, guarantees the dynamic stability of electric power system.But above-mentioned excitation unit weak point is: or the function of not encouraging oneself; Perhaps electric machine structure complexity, cost are high and do not have an automatic Regulation function; Perhaps reduced the effective stock utilization of motor; Perhaps complex circuit, production efficiency is lower; Perhaps forced exciting scarce capacity.
Summary of the invention
The purpose of this invention is to provide a kind of comparatively ideal current feedback and the parallel excitation unit of controlled excitation for synchronous generator exciting; when generator output end short circuit or terminal voltage plummet; can compensate or increase exciting power rapidly; for in time providing short circuit current, synchronous generator keeps ability; realize the selective protection of electric power system, guarantee the dynamic stability of electric power system.
For achieving the above object, the technical solution adopted in the present invention is: a kind of current feedback and the parallel excitation unit of controlled excitation, comprise the adjuster summation current transformer, the secondary side winding of current transformer is connected with rectifier bridge, the F1 pin of adjuster is connected with rectifier bridge DC side output plus terminal with the silicon controlled negative electrode respectively, the G pin of adjuster is connected with the silicon controlled control utmost point, and the N pin of adjuster connects rectifier bridge DC side output negative terminal, and the V pin of adjuster connects the silicon controlled anode; When being used for generator excitation, one end of generator excitation winding is connected with the F1 pin of rectifier bridge DC side output plus terminal, silicon controlled negative electrode and adjuster respectively, the other end of generator excitation winding is connected with the N pin of adjuster and the asterism N of generator armature winding respectively, with the V pin of silicon controlled anode and the adjuster V phase output terminal of sending and receiving armature winding respectively, connect the U pin of adjuster and the U phase output terminal of armature winding.
Further improve excitation unit of the present invention: according to the characteristics of three-phase synchronous AC generator three-phase alternating current output, current transformer adopts threephase current transformer, the three-phase output end of Current Transformer Secondary side is connected with the rectifier bridge ac input end respectively, when being used for generator excitation, the three-phase input end of current transformer primary side is connected with U phase output terminal, V phase output terminal and the W phase output terminal of generator armature winding respectively.
Rectifier bridge is three-phase commutation bridge.
Adjuster adopts automatic voltage regulator.
Current feedback of the present invention and the parallel excitation unit of controlled excitation provide enough exciting currents under generator external circuit steady short-circuit condition, make synchronous generator can keep the short circuit current of 3 times of rated current at least, last 2 seconds.Simultaneously, to the big capacity inductive load of generator impact or when requiring generator directly to start operating mode such as large capacity motor, the terminal voltage of generator is reduced in the scope of customer requirement, and recovers rapidly in the section in preset time.Compare with excitation mode and the device thereof of present employing, this excitation unit has solved the deficiency that the separate excitation device does not possess the self-excitation function; Expensive and the motor of permanent magnetism or composite excitation mode permanent magnet can not automatic Regulation deficiency; Pilot exciter excitation unit electric machine structure more complicated, the defective that motor overall dimension increases; The third harmonic excitation device needs to bury the harmonic wave auxiliary winding specially underground on stator, has reduced the effective stock utilization of motor, influences the defective of air-gap field waveform; It is comparatively complicated to have remedied phase compound excitation excitation unit excitation circuit, and excitation unit is comparatively heavy, the deficiency that production efficiency is lower; The relatively poor defective of static controlled excitation unit forced exciting ability.
Current feedback is compared with the separate excitation device with the parallel excitation unit of controlled excitation and has been realized the self-excitation function; Compare with permanent magnetism or composite excitation mode and to have saved expensive permanent magnet and to have had the automatic Regulation function; With pilot exciter excitation unit simplified in comparison electric machine structure, shortened the motor axial length, saved the permanent magnetism pilot exciter; Comparing with the third harmonic excitation device does not need to bury the harmonic wave auxiliary winding specially underground on stator, has improved the effective stock utilization of motor, has improved air-gap field; Compare with the phase compound excitation excitation unit and to have saved reactance phase shift link, simplified the excitation circuit, improved production efficiency.Compare with static controlled excitation unit and to have improved the forced exciting ability greatly and to provide short circuit current to keep ability.This excitation unit is a kind of more high-strength ability of encouraging and can satisfy the novel excitation unit that short circuit current is kept Capability Requirement of having.
Description of drawings
Fig. 1 is the structural representation of the parallel excitation unit of the present invention.
Fig. 2 is the theory diagram of the parallel excitation unit of the present invention.
Among the figure: 1. controllable silicon, 2. adjuster, 3. current transformer, 4. rectifier bridge, 5. generator excitation winding, 6. generator armature winding.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Be to solve the above-mentioned problems in the prior art, the invention provides a kind of by current transformer feedback current and the excitation unit of thyristor excitation output current at DC side parallel, abbreviation " current feedback and the parallel excitation unit of controlled excitation ".This excitation unit mainly is applicable to brushless (or the brush is arranged) synchronous generator (hereinafter to be referred as self-exciter) that exciting power and adjuster working power are provided by synchronous alternating-current generator self.This excitation unit can compensate or increase exciting power rapidly when generator output end short circuit or terminal voltage plummet, keep ability for generator provides short circuit current, realizes the selective protection of electric power system, keeps the dynamic stability of electric power system.This parallel excitation unit as shown in Figure 1, comprise adjuster 2 summation current transformers 3, current transformer 3 is threephase current transformer, the three-phase input end of current transformer 3 primary sides respectively with the three-phase output end of generator armature winding 6, namely U phase output terminal, V phase output terminal and W phase output terminal are connected; The three-phase output end of the secondary side of current transformer 3 three-phases is connected with the side three-phase input end that exchanges of rectifier bridge 4 respectively, and rectifier bridge 4 is three-phase commutation bridge.Adjuster 2 adopts automatic voltage regulator, and the F1 pin of adjuster 2 is connected with the negative electrode of controllable silicon 1, the anode of rectifier bridge 4 DC side output and the anode (F1 end) of generator excitation winding 5 respectively; The G pin of adjuster 2 is connected with the control utmost point of controllable silicon 1; The N pin of adjuster 2 is connected with the negative terminal of the asterism N of generator armature winding 6, the negative terminal of motor excitation winding 5 (F2 end) and the output of rectifier bridge 4 DC side respectively; The V pin of adjuster 2 is connected with the anode of controllable silicon 1 and the V phase output terminal of generator armature winding respectively; The U phase output terminal of the U pin sending and receiving armature winding 6 of adjuster 2.
Excitation unit operation principle explanation of the present invention:
The generator No Load Start is during to given rotating speed, utilize 1 conducting of remanent magnetism voltage triggered controllable silicon, set up exciting voltage at the excitation winding two ends, this remanent magnetism voltage progressively improves with the raising of generator speed, thereby exciting voltage and generator voltage are further improved, when rated speed, again by the control utmost point G control silicon controlled ON time of adjuster 2 by the internal or external controllable silicon 1 of control, and then increase or the minimizing of control motor excitation electric current, realize the foundation of generator voltage, stable and adjusting.This terminal voltage tap voltage of terminal voltage same frequency (or with) is working power and the measuring-signal of adjuster 2.
If generator does not have load current, current transformer 3 is feedback not, and namely current transformer 3 secondary side three-phase output ends do not have alternating current output.When the generator belt load, the secondary winding of current transformer 3 is responded to and the proportional three-phase current of load current, and provides the part exciting current by rectifier bridge 4 to generator excitation winding 5.At this moment, the secondary side alternating current of current transformer 3 is in parallel at generator excitation winding 5 two ends with controllable silicon 1 loop current of adjuster 2 control after rectifier bridge 4 rectifications, required whole exciting currents when generator loading is provided.
When owing to the big capacity inductive load of impact or directly start reasons such as large capacity motor and generator voltage is declined to a great extent or during the output short circuit, following situation will appear in controllable silicon 1 loop of adjuster 2 controls: the one, and terminal voltage declines to a great extent the exciting voltage of controllable silicon 1 foundation is declined to a great extent, thereby exciting current is declined to a great extent; The 2nd, the output short circuit, U phase output terminal and V phase output terminal voltage are zero, make adjuster 2 power supply of losing the job, turn-off in controlled loop, excitation-free current output.But be accompanied by the big capacity inductive load of impact or start directly that terminal voltage that reasons such as large capacity motor cause declines to a great extent or the situation of output short circuit, be that the generator output end electric current increases greatly, the electric current of current transformer 3 primary sides is corresponding significantly to be increased, make the three-phase alternating current of current transformer 3 secondary sides feedback also increase greatly, the three-phase alternating current of this feedback is flowed through, and DC excitation electric current after rectifier bridge 4 rectifications is also corresponding to be increased greatly, as long as current transformer 3 designs are proper, increase part and can compensate even increase the controllable silicon 1 loop exciting current reduction of controlling because of the adjuster 2 that terminal voltage descends or the output short circuit causes, thereby compensation even increased exciting power, make terminal voltage be reduced in the given scope and in the given time period fast quick-recovery, guarantee power system dynamic stability or provide enough short circuit currents to keep ability.This excitation unit adopts current feedback and controlled excitation parallel way, can realize under the steady short-circuit condition that synchronous generator can be kept the short circuit current of 3 times of rated current at least, lasts 2 seconds.Simultaneously, can reach the big capacity inductive load of generator impact or when requiring generator directly to start operating modes such as large capacity motor, the terminal voltage of generator is reduced in the given range, and the purpose of recovering rapidly in the section in preset time, has improved the electric serviceability of motor greatly.
From above introduction as can be seen, current feedback and the parallel excitation unit of controlled excitation satisfy given voltage-regulation scope and time and short circuit current fully and keep Capability Requirement, and this scheme is our verification experimental verification, proves feasible fully.
Current feedback and the parallel excitation unit of controlled excitation and existing synchronous generator excitation equipment all have bigger difference, as the separate excitation device, and permanent magnetism or composite excitation, pilot exciter excitation, third harmonic excitation, phase compound excitation excitation unit etc.Be compared as follows respectively:
The excitation source of this excitation unit need not require the outside that power supply is provided from motor itself, with the excitation source of separate excitation device and working power from independently external power is obviously different.
Permanent magnetism or composite excitation mode rely on permanent magnet to set up machine operation magnetic field, utilize magnet steel to keep excitation field when the machine terminal shortcircuit, provide short circuit current to keep ability, and be different with the excitation principle of this excitation unit.
The pilot exciter excitation unit mainly is made up of parts such as the shaft-driven excitation generator of generator main and voltage-operated devices.The excitation source of this excitation generator or the magnetic field that relies on permanent magnet to set up, or the stray field of dependence main generator rotor.Its output is as the working power of excitation source and the adjuster of main generator.Therefore, the pilot exciter excitation unit still can provide exciting power to main frame when main generator unit stator machine terminal shortcircuit, guarantees that short circuit current keeps ability.But it is different with the excitation principle of this excitation unit.
The third harmonic excitation device is mainly by the triple-frequency harmonics auxiliary winding that is embedded on the stator, and parts such as voltage-operated device and rectifying device are formed.This harmonic wave auxiliary winding utilizes the harmonic voltage of inducting of the triple-frequency harmonics magnetic field in the air-gap field, to motor output exciting power.And the exciting power of this motor is taken from motor output end, and two kinds of excitation unit principles are different fully.
The phase compound excitation excitation unit mainly is made up of parts such as reactor, current transformer, voltage-operated device and rectifying devices.When zero load, after the reactor phase shift, provide DC excitation power by rectifier bridge to motor by motor remanent magnetism voltage, set up voltage.When load, provide DC excitation power by rectifier bridge to motor by reactor dephased current and current transformer feedback current exchanging the synthetic back of side phase vectors, guarantee that generator voltage is stable.When generator machine terminal shortcircuit, guarantee that by the current transformer feedback current short circuit current keeps ability.No matter and be that the voltage regulator that can control automatically or the regulating resistor that can not control are automatically all controlled voltage by the mode of shunting in parallel with excitation winding.In this excitation unit, control the size of exciting current on the one hand by the controlled member of adjuster control, and then the stability of control motor terminal voltage.The shunting mode in parallel that does not have the phase shift link of reactor and regulator and excitation winding.Controlled member output is synthetic at DC side parallel with current feedback on the other hand, does not exchange the synthetic link of side phase vectors.Therefore, two kinds of excitation unit differences.
What need in addition to remark additionally is, generally adopts the self-exciter of static controlled excitation unit because there is not the excitation compensation arrangement, when introducing as the preamble principle as described in, do not possess short circuit current and keep ability.Also inequality with this excitation unit.
In sum, current feedback and the parallel excitation unit of controlled excitation are a kind of more high-strength abilities of encouraging and can satisfy the novel excitation unit that short circuit current is kept Capability Requirement of having.
Claims (4)
1. a current feedback and the parallel excitation unit of controlled excitation, it is characterized in that, comprise adjuster (2) summation current transformer (3), the secondary side winding of current transformer (3) is connected with rectifier bridge (4), the F1 pin of adjuster (2) is connected with rectifier bridge (4) DC side output plus terminal with the negative electrode of controllable silicon (1) respectively, the G pin of adjuster (2) is connected with the control utmost point of controllable silicon (1), the N pin of adjuster (2) connects rectifier bridge (4) DC side output negative terminal, and the V pin of adjuster (2) connects the anode of controllable silicon (1); When being used for generator excitation, one end of generator excitation winding is connected with the negative electrode of rectifier bridge (4) DC side output plus terminal, controllable silicon (1) and the F1 pin of adjuster (2) respectively, the other end of generator excitation winding is connected with the N pin of adjuster (2) and the asterism N of generator armature winding (6) respectively, with the V pin of the anode of controllable silicon (1) and adjuster (2) the V phase output terminal of sending and receiving armature windings (6) respectively, connect the U pin of adjuster (2) and the U phase output terminal of armature winding (6).
2. current feedback as claimed in claim 1 and the parallel excitation unit of controlled excitation, it is characterized in that, described current transformer (3) is threephase current transformer, the three-phase output end of current transformer (3) secondary side is connected with the ac input end of rectifier bridge (4) respectively, when being used for generator excitation, the three-phase input end of current transformer (3) primary side is connected with generator armature winding (6), U phase output terminal, V phase output terminal and W phase output terminal respectively.
3. current feedback as claimed in claim 1 or 2 and the parallel excitation unit of controlled excitation is characterized in that, described rectifier bridge (4) is three-phase commutation bridge.
4. current feedback as claimed in claim 1 and the parallel excitation unit of controlled excitation is characterized in that, described adjuster (2) adopts automatic voltage regulator.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104467585A (en) * | 2014-11-28 | 2015-03-25 | 魏绍宏 | Protection circuit of seawater power generation system |
| CN104753421A (en) * | 2013-12-28 | 2015-07-01 | 易泰帝传动技术(烟台)有限公司 | Current sampling and calibrating method of DC speed controller |
| RU2581650C1 (en) * | 2015-02-24 | 2016-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) | Power unit with controlled reactive power, magnitude and phase of voltage |
| CN106199428A (en) * | 2016-07-08 | 2016-12-07 | 兰州电机股份有限公司 | High-power double feed wind power generator pilot system and TT&C system thereof |
| CN108649844A (en) * | 2018-05-31 | 2018-10-12 | 南京航空航天大学 | A kind of brushless direct current power-generating system feed forward control method and control system |
| CN113162495A (en) * | 2021-05-14 | 2021-07-23 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753421A (en) * | 2013-12-28 | 2015-07-01 | 易泰帝传动技术(烟台)有限公司 | Current sampling and calibrating method of DC speed controller |
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| CN104467585A (en) * | 2014-11-28 | 2015-03-25 | 魏绍宏 | Protection circuit of seawater power generation system |
| RU2581650C1 (en) * | 2015-02-24 | 2016-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) | Power unit with controlled reactive power, magnitude and phase of voltage |
| CN106199428A (en) * | 2016-07-08 | 2016-12-07 | 兰州电机股份有限公司 | High-power double feed wind power generator pilot system and TT&C system thereof |
| CN108649844A (en) * | 2018-05-31 | 2018-10-12 | 南京航空航天大学 | A kind of brushless direct current power-generating system feed forward control method and control system |
| CN108649844B (en) * | 2018-05-31 | 2021-07-27 | 南京航空航天大学 | Feedforward control method and control system for brushless direct current power generation system |
| CN113162495A (en) * | 2021-05-14 | 2021-07-23 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
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Application publication date: 20130911 |