CN202282614U - Device for eliminating voltage fluctuation and flicker of power grid based on fully controlled current transformer - Google Patents
Device for eliminating voltage fluctuation and flicker of power grid based on fully controlled current transformer Download PDFInfo
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- CN202282614U CN202282614U CN2011203897665U CN201120389766U CN202282614U CN 202282614 U CN202282614 U CN 202282614U CN 2011203897665 U CN2011203897665 U CN 2011203897665U CN 201120389766 U CN201120389766 U CN 201120389766U CN 202282614 U CN202282614 U CN 202282614U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a device for eliminating voltage fluctuation and flicker of a power grid based on a fully controlled current transformer. The device comprises a controller and a fully controlled current transforming device SVG (Static Var Generator), wherein the fully controlled current transforming device SVG is connected on a low-voltage side bus in parallel; and the controller is used for comparing the voltage of a power grid, as a control quantity, with a set fluctuation allowable value of the voltage of the power grid, and performing filtering, phase shifting, scaling-up and operational treatment on a signal variable quantity of the voltage of the power grid to obtain a differential-value control signal of the voltage, so that the fully controlled current transforming device SVG produces current waveforms, the current passes through a power transmission unit to produce waveforms differential to the voltage of the power grid and is superposed with the original fluctuation out-of-limit voltage, and thus, the purpose of stabilizing the voltage of the power grid is achieved. According to the utility model, the fully controlled current transformer is adopted in the device, so that the problem of the voltage fluctuation and flicker of the power grid can be solved effectively, the response speed is high, the tracking precision is high, the adjustment can be carried out according to an instruction of a provincial dispatching AVC (Automatic Voltage Control) system, and the stability and the reliability of the voltage of the power grid can be increased greatly.
Description
Technical field
The utility model relates to the device that SVG solves voltage fluctuation and flickering, and particularly a kind of SVG of full-control type current device that adopts solves transformer substation voltage fluctuation and flickering device in the network system.
Background technology
At present, State Grid Corporation of China has formally issued intelligent grid technical standard system and intelligent grid key equipment development planning, classifies the development of intelligent grid as following main developing direction.It is a lot of that intelligent grid relates to related industry, comprises power equipment, information communication, new forms of energy etc.The intellectualized reconstruction of reactive-load compensation equipment has become imperative inexorable trend in the intelligent grid development plan with in building.
Owing to have impact load (such as arc furnace load, steel rolling load, large-scale hoister etc.) in the electrical network; Or the feeder ear supply power voltage is discontinuous, instability etc.; Can cause voltage ripple of power network and flickering; Bring bad influence can for the operation and the efficient of electrical network, other power consumption equipments that also can be docked in this utility network simultaneously bring some bad influence even harm.Voltage ripple of power network can cause power station protective device misoperation, or causes some equipment because higher or the on the low side and fault trip of voltage, thereby influences power supply safety.
At present, be in electrical network, to add SVC to voltage ripple of power network and flickering problem-solving approach.SVC leans on the perception that contains, capacitive reactive power size in the change system to realize.SVC utilizes reactor to provide perceptual idle, utilize capacitor that capacitive reactive power is provided.The ability of capacitor output capacitive reactive power and line voltage square are directly proportional.Therefore, when line voltage is higher, need compensation arrangement to provide a small amount of idle when reducing voltage, increase on the contrary, suppress the effect reduction of fluctuation and flickering and the output of capacitor is idle.Vice versa.The response time of other SVC is relatively slow, and is also lower to the inhibition ability of voltage fluctuation and flickering.Its major defect is following:
1) its installed capacity is big, and the occupation of land space is big, and own loss is big, the ventilation and heat difficulty.
2) self produces harmonic wave, needs the configuration suitable filters to come filtering.
3) the master control device of SVC is a thyristor, and its response speed does not reach desirable effect for fast-changing load slowly.The response speed of SVC is more than the 10ms, so the ability of voltage fluctuation and flickering that suppresses generally is no more than 50%
4) SVC output is influenced by line voltage, and its fan-out capability and line voltage square are directly proportional.
5) filter comes filtering by changing harmonic impedance into, in system, can produce series parallel resonance, the harm power supply safety.
6) air-core reactor of TCR is to producing electromagnetic interference on every side.
At present, adopting static reacance generator SVG (Static Var Generator) the technology solution voltage fluctuation of full-control type current device and flickering at home and abroad also is a blank.Therefore, the SVG solution to voltage fluctuation and flickering problem has very strong exploitativeness and operability.
Summary of the invention
The purpose of the utility model provides a kind of device that solves voltage ripple of power network and flickering based on the full-control type current device; This device adopts the full-control type current device; Can effectively solve the problem of voltage ripple of power network and flickering, and response speed is fast, tracking accuracy is high; And can transfer the instruction of AVC control system to regulate according to economizing, can improve the stability and the reliability of line voltage greatly.
For realizing above-mentioned purpose, the utility model is realized through following technical scheme:
Based on the solution voltage ripple of power network of full-control type current device and the device of flickering, this device comprises controller, full-control type convertor assembly SVG, and SVG is connected in parallel on the low-pressure side bus with the full-control type convertor assembly; Controller is controlled quentity controlled variable with the line voltage; Compare with setting voltage ripple of power network permissible value; Mains voltage signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain the difference control signal of voltage, make full-control type convertor assembly SVG produce current waveform; This electric current produces waveform and the out-of-limit voltage stack of former fluctuation with the line voltage difference through the power delivery unit, reach the purpose of stablizing line voltage.
Described full-control type convertor assembly is that direct hanging type power cell Y connects tandem type chain type SVG structure.
Described controller comprises a plurality of signal processing subelements and master control subelement, each signal processing subelement; Comprise filtration module, phase shift block, ratio amplification module, computing module, the master control subelement is accomplished the control to the full-control type device;
Described filtration module comprises low pass, high pass filter and the band pass filter that each subsynchronous mode signal is carried out filtering respectively; Be used for the variable quantity of tach signal is filtered low frequency, high frequency through low pass, high pass filter; Handle through band pass filter again, obtain synchronized component;
Described phase shift block be used for the accepting filter voltage synchronizing signal of unit output is carried out phase place with the voltage synchronizing signal and is corrected;
Described ratio module is used for the subsynchronous mode signal that phase shift is handled is carried out the ratio processing and amplifying;
Described computing module is used for that the subsynchronous mode signal after phase shift, the ratio processing is carried out weighted sum and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly through functional operation.
Described full-control type convertor assembly semiconductor switch device that power cell adopts is IGBT, GTO, IGCT or IEGT full-controlled switch device.
Compared with prior art, the beneficial effect of the utility model is:
1) response speed is fast
Distinguishing feature based on full-control type device convertor assembly is exactly that response speed is fast.Its main cause is to control arbitrarily the on off state of full-control type device (GTO, IGBT, IGCT, IEGT etc.) as required.And the switching frequency of device or equivalent switching frequency are often higher, and generally the switch number of times of each power frequency period can be from several times to tens times.Therefore, based on the system response time of full-control type device convertor assembly fast several times than SVC.Inhibition to voltage ripple of power network and flickering has special effect.
2) control precision is high
Based on full-control type device convertor assembly can adopt pulse-width modulation or pulse to hit mode such as phase shift to control, add that its switching frequency is higher, just can each switch periods to system output regulate.In addition, system can also adopt the algorithm and the control method of more complicated, makes the tracking accuracy of system improve greatly.That is to say, can carry out the comprehensive regulation simultaneously to power quality problems such as idle, harmonic wave, voltage fluctuation and the flickerings of system based on full-control type device convertor assembly.
3) not influenced by system voltage
Traditional compensation arrangement SVC is made up of thyristor-controlled reactor and FC, and FC output is idle square to be directly proportional with line voltage.When line voltage is higher, need compensation arrangement to provide a small amount of idle when reducing voltage, increase on the contrary and the output of FC is idle, suppress the flickering effect and reduce.Vice versa.And be a kind of active solution based on full-control type device convertor assembly, its output offset current almost has nothing to do with line voltage.The effect of administering voltage fluctuation and flickering is not influenced by grid voltage change.
Description of drawings
Fig. 1 is the topology diagram and sampling sketch map of SVG;
Fig. 2 is controller control structure figure;
Fig. 3 is the control principle figure of full-control type current device;
Fig. 4 is a direct hanging type power cell Y type chain type SVG structural representation.
Embodiment
Be described in detail embodiment of the present invention below in conjunction with accompanying drawing.
See Fig. 1, Fig. 2, based on the solution voltage ripple of power network of full-control type current device and the device of flickering, this device comprises controller, full-control type convertor assembly SVG, and SVG is connected in parallel on the low-pressure side bus with the full-control type convertor assembly; Controller is controlled quentity controlled variable with the line voltage; Compare with setting voltage ripple of power network permissible value; Mains voltage signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain the difference control signal of voltage, make full-control type convertor assembly SVG produce current waveform; This electric current produces waveform and the out-of-limit voltage stack of former fluctuation with the line voltage difference through the power delivery unit, reach the purpose of stablizing line voltage.
See Fig. 2, controller comprises a plurality of signal processing subelements and master control subelement, each signal processing subelement; Comprise filtration module, phase shift block, ratio amplification module, computing module, the master control subelement is accomplished the control to the full-control type device;
See Fig. 3, based on the solution voltage ripple of power network of full-control type current device and the device of flickering, control method may further comprise the steps:
1) detection of grid voltage signal changes into digital signal with the voltage signal (5A, 1A) of simulating and gives controller.
2) filtering; Mains voltage signal is filtered high and low frequency through the low pass high pass filter, carry out bandpass filtering through the band pass filter in the band pass filter again, obtain the difference signal of line voltage.
3) phase place is corrected; The phase shift block that above-mentioned voltage signal is crossed is respectively separately again corrected phase place,
4) ratio is amplified; Signal after the rectification phase place carries out the gain ratio through the ratio amplification module again and amplifies;
5) calculation process; Through correct that phase place, ratio amplify the difference voltage of line voltage, draw the Comprehensive Control amount;
6) above-mentioned Comprehensive Control amount becomes the IGBT triggering constantly through function.Controller is that synchronizing signal control IGBT triggers constantly with the PT signal, make produce in the SVG device with the voltage signal of line voltage difference opposite sign but equal magnitude and former electrical network in the voltage that transfinites offset, reach the purpose of inhibition voltage fluctuation.
In the present embodiment, the full-control type current device is IGBT, also can be IGBT, GTO, IGCT, IEGT or other full-controlled switch device.
Concrete structure type below in conjunction with accompanying drawing narration SVG device.
Fig. 4 is that direct hanging type power cell Y connects tandem type chain type SVG structural representation; The individual event power cell is every to be made up of four inverse parallel switching device IGBT, diode rectification, and whole power model forms the three-level current transformer function.
Direct hanging type power cell Y meets tandem type chain type SVG and directly is connected in series to voltage levels by the individual event power cell, directly inserts electrical network behind the three-phase Y connection.Direct hanging type Y meets tandem type chain type SVG and mainly is made up of power cell, control unit, access reactor.
Claims (4)
1. based on the solution voltage ripple of power network of full-control type current device and the device of flickering, it is characterized in that this device comprises controller, full-control type convertor assembly SVG, SVG is connected in parallel on the low-pressure side bus with the full-control type convertor assembly; Controller is controlled quentity controlled variable with the line voltage; Compare with setting voltage ripple of power network permissible value; Mains voltage signal variable quantity via controller is carried out filtering, phase shift, ratio amplification, calculation process, obtain the difference control signal of voltage, make full-control type convertor assembly SVG produce current waveform; This electric current produces waveform and the out-of-limit voltage stack of former fluctuation with the line voltage difference through the power delivery unit, reach the purpose of stablizing line voltage.
2. according to claim 1ly it is characterized in that based on the solution voltage ripple of power network of full-control type current device and the device of flickering described full-control type convertor assembly is that direct hanging type power cell Y connects tandem type chain type SVG structure.
3. according to claim 1 based on the solution voltage ripple of power network of full-control type current device and the device of flickering; It is characterized in that; Described controller comprises a plurality of signal processing subelements and master control subelement; Each signal processing subelement comprises filtration module, phase shift block, ratio amplification module, computing module, and the master control subelement is accomplished the control to the full-control type device;
Described filtration module comprises low pass, high pass filter and the band pass filter that each subsynchronous mode signal is carried out filtering respectively; Be used for the variable quantity of tach signal is filtered low frequency, high frequency through low pass, high pass filter; Handle through band pass filter again, obtain synchronized component;
Described phase shift block be used for the accepting filter voltage synchronizing signal of unit output is carried out phase place with the voltage synchronizing signal and is corrected;
Described ratio module is used for the subsynchronous mode signal that phase shift is handled is carried out the ratio processing and amplifying;
Described computing module is used for that the subsynchronous mode signal after phase shift, the ratio processing is carried out weighted sum and handles the Comprehensive Control amount that obtains; This controlled quentity controlled variable is become the control signal of full-control type convertor assembly through functional operation.
4. according to claim 1 based on the solution voltage ripple of power network of full-control type current device and the device of flickering; It is characterized in that described full-control type convertor assembly semiconductor switch device that power cell adopts is IGBT, GTO, IGCT or IEGT full-controlled switch device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203897665U CN202282614U (en) | 2011-10-13 | 2011-10-13 | Device for eliminating voltage fluctuation and flicker of power grid based on fully controlled current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203897665U CN202282614U (en) | 2011-10-13 | 2011-10-13 | Device for eliminating voltage fluctuation and flicker of power grid based on fully controlled current transformer |
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| CN202282614U true CN202282614U (en) | 2012-06-20 |
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| CN2011203897665U Expired - Lifetime CN202282614U (en) | 2011-10-13 | 2011-10-13 | Device for eliminating voltage fluctuation and flicker of power grid based on fully controlled current transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319769A (en) * | 2014-10-28 | 2015-01-28 | 国网辽宁省电力有限公司朝阳供电公司 | SVG active filtering control method |
-
2011
- 2011-10-13 CN CN2011203897665U patent/CN202282614U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319769A (en) * | 2014-10-28 | 2015-01-28 | 国网辽宁省电力有限公司朝阳供电公司 | SVG active filtering control method |
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Granted publication date: 20120620 |
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| CX01 | Expiry of patent term |