CN103683317A - New type self-synchronization grid connection device - Google Patents
New type self-synchronization grid connection device Download PDFInfo
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- CN103683317A CN103683317A CN201210353354.5A CN201210353354A CN103683317A CN 103683317 A CN103683317 A CN 103683317A CN 201210353354 A CN201210353354 A CN 201210353354A CN 103683317 A CN103683317 A CN 103683317A
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Abstract
The invention relates to a generator new type self-synchronization grid connection device, and pertains to the technical field of power electronics. The device can be used in reliable grid connection of large generators, and the superior grid connection performance of the device can be shown especially in grid accident conditions.
Description
Technical field
The present invention relates to a kind of new-type automatic self synchronizing grid-connecting apparatus of generator, belong to electric and electronic technical field, can be used for the reliably grid-connected of high-rating generator, especially in power grid accident situation, more demonstrate this and install superior grid-connected performance.
Background technology
Generator grid-connected has two kinds of modes, and accurate simultaneous interconnecting and automatic self synchronizing are grid-connected.
Accurate simultaneous interconnecting is that the generator of input coefficient is not added to excitation, and regulates its voltage and frequency, when meeting grid-connected condition (be that voltage and frequency equate with system, phase place is identical) by generator input coefficient.
Automatic self synchronizing is grid-connected is by excitation not and rotating speed approaches the generator input coefficient of synchronous speed, and (or through an of short duration time delay) adds excitation immediately, and generator is at short notice by automatic pull-in step.
If accurate simultaneous interconnecting can reach perfect condition, generator output current is very little, can generation current and the impact of electromagnetic torque.But in the also net operation of reality, the grid-connected condition that is difficult to realize ideal, so electric current and always existence of electromagnetic torque impact.As long as impact not quite, be no more than allowed band, allow.
During accurate simultaneous interconnecting, must prevent asynchronous parallelizing, otherwise can make generator be damaged.If when grid-connected, between generator voltage and system voltage, there is larger difference (voltage, frequency, phase place), can produce larger impact, the impact wherein causing because of phase difference is more.The most serious situation is to spend and carry out asynchronous parallelizing when generator voltage and system voltage phase difference 180, now the impulse current of generator is by large 1 times of electric current during three-phase shortcircuit than outlet, producing huge electric power and electromagnetic torque, make generator sustain a damage. the past was destroyed the serious accident of short circuit with regard to occurring because asynchronous parallelizing makes stator winding insulation in generator.
The test volume that accurate simultaneous interconnecting requires is more, testing apparatus more complicated; Require secondary connection can not occur must conscientiously checking check after mistake, correct, the each maintenance of synchronous device action.
When electrical network has an accident the standby unit of the urgent input of (voltage and frequency are unstable) needs, accurate simultaneous interconnecting is to this helpless (grabbing less than synchronization point).
Automatic self synchronizing is grid-connected is at generator input coefficient during without excitation, pull-in step rapidly under the acting in conjunction of the synchronising torque in mechanical force moment, asynchronous moment and after putting into excitation, therefore it has fundamentally eliminated the possibility of asynchronous parallelizing, it is grid-connected simple to operate simultaneously, there is not adjusting and calibration voltage and phase problem, only need regulator generator rotating speed, easily be automated operation.In addition as long as, the grid-connected time of automatic self synchronizing is short, adopts the grid-connected hydraulic generator of self-synchroniser, from sending power-on command, to generator, is incorporated to system generally the even shorter time of 20～40S.This advantage that automatic self synchronizing is grid-connected, while there is low frequency low-voltage for having an accident in electric power system, start guest machine and form the good condition of having made, this is for preventing system break-down and fault spread, and the normal work of recovery system plays an important role quickly.
When automatic self synchronizing is grid-connected, generator is equivalent to asynchronous motor, therefore be attended by the rush of current of short time, and make system voltage decline (be equivalent to the starting of asynchronous motor, but it is less that impulse current is wanted), the electric power that impulse current causes may all produce harmful effect to stator winding insulation and stator winding end; Impacting electromagnetic torque also will make unit macro-axis produce moment of torsion and vibration, although the impact of these harmful effects during far beyond generator outlet three-phase shortcircuit is little, generator can bear, if but also net operation will often carry out, its build-up effect also can not be ignored, it will affect the useful life of generator, therefore be generally all now using automatic self synchronizing grid-connected under accident condition the emergency start of generator grid-connected, the grid-connected automatic presynchronization of using is under normal circumstances grid-connected.
From narration above, two kinds and net mode respectively have pluses and minuses.From easy to use, realize automation aspect, the grid-connected advantage of automatic self synchronizing is some more.Just, due to the progress of automatic presynchronization technology, make its impulse current fall littlely, thus current under normal circumstances and net mode be all selected from moving accurate synchronous operation.So, if rush of current when we can be grid-connected automatic self synchronizing is controlled littlely, its unique shortcoming has just been overcome, does not is not its superiority more to give prominence to?
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of new-type automatic self synchronizing grid-connecting apparatus of switch transformer technique that utilizes to address the above problem.Switch transformer technique combines switch transformer and power electronic device in fact exactly, has formed the electronic power switch module of high pressure resistant, a large electric current.When automatic self synchronizing is grid-connected, it is added between generator and electrical network, controls the electric current wherein flowing through, impact is reduced.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The new-type automatic self synchronizing grid-connecting apparatus of generator, comprises operating circuit breaker K1, switch transformer TK, thyristor SCR, isolating switch K2, K3; Isolating switch K2 of upper termination of the former limit of described switch transformer TK winding, the lower termination another isolating switch K3 of the former limit of switch transformer TK winding; Switch transformer TK pays between the two ends of the every phase simplex winding in limit and is connected to two just antiparallel thyristor SCR; The other end of two isolating switch K2, K3 is connected to respectively two ends of operating circuit breaker K1.
The grid-connection control system of described new-type automatic self synchronizing grid-connecting apparatus adopts programmable controller PLC or industrial computer COM control system, and its voltage sensor PT and current sensor CT configure on demand.
When the power electronic device of described new-type automatic self synchronizing grid-connecting apparatus adopts full control device IGCT, can obtain high-voltage large current and entirely control adjustment module, its control method is that pulse-width modulation PWM is controlled.
When generator is larger, can take the method for many auxiliary winding switch transformer to solve, also can take the method for switch transformer module use to solve.
The application of new-type automatic self synchronizing grid-connecting apparatus is simplified the grid-connected control of generator, has exempted non-synchronization paralleling completely, significant to the safety in production of generator.
For accounting for the generator that power system capacity ratio is very large, the past, therefore the automatic self synchronizing parallel operation of high-rating generator has been subject to certain limitation, this accident treatment to electrical network had a certain impact because automatic self synchronizing has larger voltage-drop when grid-connected.Adopt after new-type automatic self synchronizing grid-connecting apparatus, impulse current is eliminated, and voltage-drop reduces, even if high-rating generator also can adopt automatic self synchronizing grid-connected when electrical network has an accident, this is significant to the safe and stable operation of electrical network undoubtedly.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the main circuit diagram of new-type automatic self synchronizing grid-connecting apparatus.
Fig. 2 is to have adopted by two two winding switch transformer modules and is the automatic self synchronizing grid-connecting apparatus that full-control type IGCT, computer control system COM and voltage sensor PT and current sensor CT form by, power electronic device.
Embodiment
Adopt the automatic self synchronizing grid-connected system figure of switch transformer TK technology as shown in Figure 1: comprise operating circuit breaker K1, switch transformer TK, thyristor SCR, isolating switch K2 and K3; The upper termination isolating switch K2 of the former limit of described switch transformer TK winding, the lower termination isolating switch K3 of the former limit of switch transformer TK winding; Switch transformer TK pays between the two ends of the every phase simplex winding in limit and is connected to two just antiparallel thyristor SCR; The other end of two isolating switch K2, K3 is connected to respectively two ends of operating circuit breaker K1.
The grid-connection control system of described new-type automatic self synchronizing grid-connecting apparatus adopts programmable controller PLC control system, and its voltage sensor PT and current sensor CT configure on demand.
When control device is received starting command, control device regulates speed regulator that generator DF is accelerated, when the voltage of control device detection voltage sensor PT reaches certain value, generator reaches certain rotating speed, send K2, the combined floodgate order of K3, at this moment between switch transformer TK access electrical network and generator DF (through step-up transformer), because now controllable silicon SCR is not yet open-minded, therefore only flow through an electric current that is less than its no-load current in TK, this electric current is very little, can not impact DF and electrical network, afterwards, control device progressively regulates the angle of flow of SCR and detects the electric current in current sensor CT, electric current is strengthened gradually until set point, under this set point, doing constant current controls. when generator DF rotating speed reaches 98% left and right of synchronous speed, K1 closes a floodgate, throwing is encouraged, disconnect K2, K3 exits switch transformer TK, motor generator DF continues to accelerate until synchronous.
The control method of Fig. 2 is same as described above, and just now the electric current in circuit be entirely to control waveform.
Here grid-connection control device adopts industrial computer COM control system, voltage sensor PT and current sensor CT have been configured, power electronic device adopts full control device IGCT, and therefore can obtain high-voltage large current controls adjusting entirely, and its control method is that pulse-width modulation PWM is controlled.Because generator is larger, therefore take the method for many auxiliary winding switch transformer and the method for switch transformer module use to solve.
Just a kind of embodiment of this invention of foregoing description, do not illustrate essence of an invention Composition of contents is limited, person of an ordinary skill in the technical field, having read modification or the distortion of after specification, aforesaid embodiment being made, does not deviate from essence of an invention and scope.
Claims (5)
1. the new-type automatic self synchronizing grid-connecting apparatus of generator, comprises operating circuit breaker (K1), it is characterized in that, also comprises switch transformer (TK), thyristor (SCR), isolating switch (K2, K3); The upper termination isolating switch (K2) of the former limit of described switch transformer (TK) winding, the lower termination isolating switch (K3) of the former limit of switch transformer (TK) winding; Between the two ends of switch transformer (TK) pair every phase simplex winding in limit, be connected to two just antiparallel thyristors (SCR); The other end of two isolating switches (K2, K3) is connected to respectively two ends of operating circuit breaker (K1).
2. new-type automatic self synchronizing grid-connecting apparatus according to claim 1, is characterized in that, its grid-connection control system adopts programmable controller (PLC) or industrial computer (COM) control system.
3. new-type automatic self synchronizing grid-connecting apparatus according to claim 1, is characterized in that, its voltage sensor (PT) and current sensor (CT) configure on demand.
4. new-type automatic self synchronizing grid-connecting apparatus according to claim 1, is characterized in that, when power electronic device adopts full control device (IGCT), can obtain high-voltage large current and entirely control adjustment module, and its control method is that pulse-width modulation (PWM) is controlled.
5. new-type automatic self synchronizing grid-connecting apparatus according to claim 1, is characterized in that, when generator is larger, can take the method for many auxiliary winding switch transformer to solve, and also can take the method for switch transformer module use to solve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210353354.5A CN103683317A (en) | 2012-09-21 | 2012-09-21 | New type self-synchronization grid connection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210353354.5A CN103683317A (en) | 2012-09-21 | 2012-09-21 | New type self-synchronization grid connection device |
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| CN103683317A true CN103683317A (en) | 2014-03-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300436A (en) * | 2016-09-11 | 2017-01-04 | 四川大唐国际甘孜水电开发有限公司 | A kind of hydroelectric power plant's simultaneous interconnecting control method and device |
| CN107276095A (en) * | 2016-04-07 | 2017-10-20 | 哈尔滨帕特尔科技股份有限公司 | Switching transformer type is without impact pressure regulator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182525A (en) * | 2010-02-26 | 2011-09-15 | Toshiba Corp | Power distribution controller, and power distribution facility for power plant |
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- 2012-09-21 CN CN201210353354.5A patent/CN103683317A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182525A (en) * | 2010-02-26 | 2011-09-15 | Toshiba Corp | Power distribution controller, and power distribution facility for power plant |
Non-Patent Citations (2)
| Title |
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| 冯卓利等: "开关变压器技术在水轮发电机自同期并列上的应用", 《电气技术》, no. 1, 15 January 2012 (2012-01-15) * |
| 潘政刚等: "开关变压器模块在抽水蓄能电站软启动方面的应用研究", 《电气技术》, no. 8, 15 August 2010 (2010-08-15), pages 174 - 177 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276095A (en) * | 2016-04-07 | 2017-10-20 | 哈尔滨帕特尔科技股份有限公司 | Switching transformer type is without impact pressure regulator |
| CN106300436A (en) * | 2016-09-11 | 2017-01-04 | 四川大唐国际甘孜水电开发有限公司 | A kind of hydroelectric power plant's simultaneous interconnecting control method and device |
| CN106300436B (en) * | 2016-09-11 | 2018-07-06 | 四川大唐国际甘孜水电开发有限公司 | A kind of hydroelectric power plant's simultaneous interconnecting control method and device |
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Application publication date: 20140326 |