CN104377712A - STATCOM (static VAR compensator) - Google Patents
STATCOM (static VAR compensator) Download PDFInfo
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- CN104377712A CN104377712A CN201410710906.2A CN201410710906A CN104377712A CN 104377712 A CN104377712 A CN 104377712A CN 201410710906 A CN201410710906 A CN 201410710906A CN 104377712 A CN104377712 A CN 104377712A
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- current
- optical
- voltage source
- mutual inductor
- source converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a STATCOM (static VAR compensator) comprising a voltage source converter and an optical current transformer. The voltage source converter is an alternating current/direct current converter composed of a shut-off device; the voltage source converter is electrically connected to a reactor, a direct current capacitor and the optical current transformer; the voltage source converter is used for adjusting amplitude and phase of alternating current side output voltage according to data transmitted back by the optical current transformer, thus the STATCOM absorbs or transmits reactive current which is satisfactory; the optical current transformer is parallelly connected to the reactor and a grid system and is used for detecting alternating current component and direct current component of current in the grid system and transmitting the detected data to the voltage source converter.
Description
Technical field
The present invention relates to electronic circuit technology, especially, relate to a kind of STATCOM static passive compensation device.
Background technology
STATCOM (Static Synchronous Compensator, is hereinafter abbreviated as STATCOM) static passive compensation device is generally used for providing dynamic passive compensation and burning voltage.When STATCOM static passive compensation device works, need to carry out gathering to system power amount and detect.If containing DC component in collection electric current, then need to gather and extract the DC component of output current, and being suppressed by control measure.In prior art, the routine techniques measuring electric current in high voltage, big current, superpower electric power system adopts the current transformer based on electromagnetic induction principle, as Hall element, conventional current instrument transformer, DC current transformer, Luo-coil etc.But all there are some shortcomings separately in these current acquisition elements: Hall element needs the control power supply of high potential, there is drift, cannot Measurement accuracy DC quantity; Conventional current instrument transformer can only measure of ac, cannot detect DC quantity; DC current transformer can only measure DC quantity, cannot detect of ac; Luo-coil cannot Measurement accuracy DC quantity.
For the range of dynamic measurement of any one current transformer is little in STATCOM static passive compensation device in prior art, frequency band is narrow, is subject to electromagnetic interference, easily magnetic saturation unshakable in one's determination under fault current, there is hysteresis, the problem that the shortcomings such as DC component can not avoid simultaneously cannot be measured, not yet have effective solution at present.
Summary of the invention
Little for the range of dynamic measurement of any one current transformer in STATCOM static passive compensation device in prior art, frequency band is narrow, be subject to electromagnetic interference, easily magnetic saturation unshakable in one's determination under fault current, there is hysteresis, the problem that the shortcomings such as DC component can not be avoided simultaneously cannot be measured, the object of the invention is to propose a kind of STATCOM static passive compensation device, volume can be used little, cost is low, good insulating, range of dynamic measurement is large and can gather the DC component of electric current and the better acquisition system electric current of current transformer of alternating current component simultaneously, for system provides high-quality dynamic passive compensation and burning voltage.
Based on above-mentioned purpose, technical scheme provided by the invention is as follows:
According to an aspect of the present invention, a kind of STATCOM static passive compensation device is provided.
Voltage source converter is comprised according to STATCOM static passive compensation device provided by the invention, voltage source converter is the alternating current-direct current converting apparatus of the device composition with turn-off capacity, voltage source converter is electrically connected to linked reactor, direct current capacitor and optical current mutual inductor, data for returning according to optical current mutual inductor regulate amplitude and the phase place of AC output voltage, make device absorb or send the reactive current met the demands; Direct current capacitor, contact in direct current capacitor and service entrance switch loop, direct current capacitor is the energy storage original paper of voltage source converter, for DC voltage being converted to the alternating voltage with network system same frequency; Service entrance switch loop, service entrance switch loop and direct current capacitor are contacted, for controlling the operating state of direct current capacitor; Linked reactor, linked reactor is connected in parallel to voltage source converter and optical current mutual inductor, for providing the reactance of coupling for voltage source converter; Optical current mutual inductor, optical current mutual inductor is connected in parallel to linked reactor and network system, for the current alternating component in detection of grid system and DC component, and the data detected is sent to voltage source converter.
Wherein, optical current mutual inductor is passive device, and optical current mutual inductor can be optical glass type current transformer or all-fiber current transformator.
Further, optical current mutual inductor can be optical glass type current transformer; Use the reflection phase shift that biorthogonal mirroring scheme elimination light is introduced in reflection process, wherein, biorthogonal mirroring scheme is that each pip place two secondary reflections replace original primary event in the optical path.
Meanwhile, optical current mutual inductor also can be all-fiber current transformator; Each STATCOM static passive compensation device comprises three groups of identical circuit, often organize circuit for measuring the phase in three-phase change of current chain output current, often organize circuit and include an all-fiber current transformator, each all-fiber current transformator is all arranged contacts with coupler.
As can be seen from above, technical scheme provided by the invention substitutes general electromagnetic current transducer by using optical current mutual inductor, solve traditional electromagnetic current transducer range of dynamic measurement little, frequency band is narrow, be subject to electromagnetic interference, easily magnetic saturation unshakable in one's determination under fault current, there is hysteresis, the problem that the shortcomings such as DC component can not be avoided simultaneously cannot be measured, volume can be used little, cost is low, good insulating, range of dynamic measurement is large and can gather the DC component of electric current and the better acquisition system electric current of current transformer of alternating current component simultaneously, for system provides high-quality dynamic passive compensation and burning voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of the STATCOM static passive compensation device according to the embodiment of the present invention;
Fig. 2 is the light path principle figure of the biorthogonal mirroring scheme that in the STATCOM static passive compensation device according to the embodiment of the present invention, optical glass type current transformer uses;
Fig. 3 is the fundamental diagram of all-fiber current transformator in the STATCOM static passive compensation device according to the embodiment of the present invention;
Fig. 4 is the phase state change oscillogram of electric current in the all-fiber current transformator according to the STATCOM static passive compensation device of the embodiment of the present invention;
Fig. 5 is the overall circuit diagram of the STATCOM static passive compensation device according to the embodiment of the present invention.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention carry out further clear, complete, describe in detail, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
According to one embodiment of present invention, a kind of STATCOM static passive compensation device is provided.
As shown in Figure 1, the STATCOM static passive compensation device provided according to embodiments of the invention comprises:
Voltage source converter 11, voltage source converter 11 is for having the alternating current-direct current converting apparatus of the device composition of turn-off capacity, voltage source converter 11 is electrically connected to linked reactor 14, direct current capacitor 12 and optical current mutual inductor 15, data for returning according to optical current mutual inductor 15 regulate amplitude and the phase place of AC output voltage, make device absorb or send the reactive current met the demands.
Direct current capacitor 12, contact in direct current capacitor 12 and service entrance switch loop 13, direct current capacitor 12 is the energy storage original paper of voltage source converter 11, for DC voltage being converted to the alternating voltage with network system same frequency.
Service entrance switch loop 13, service entrance switch loop 13 and direct current capacitor 12 are contacted, for controlling the operating state of direct current capacitor 12.
Linked reactor 14, linked reactor 14 is connected in parallel to voltage source converter 11 and optical current mutual inductor 15, for providing the reactance of coupling for voltage source converter 11.
Optical current mutual inductor 15, optical current mutual inductor 15 is connected in parallel to linked reactor 14 and network system, for the current alternating component in detection of grid system and DC component, and the data detected is sent to voltage source converter.
Wherein, optical current mutual inductor is passive device, and optical current mutual inductor is one of following: optical glass type current transformer, all-fiber current transformator.
Particularly, optical current mutual inductor is optical glass type current transformer; Use the reflection phase shift that biorthogonal mirroring scheme elimination light is introduced in reflection process, wherein, biorthogonal mirroring scheme is that each pip place two secondary reflections replace original primary event in the optical path.
Particularly, optical current mutual inductor is all-fiber current transformator; Each STATCOM static passive compensation device comprises three groups of identical circuit, often organize circuit for measuring the phase in three-phase change of current chain output current, often organize circuit and include an all-fiber current transformator, each all-fiber current transformator is all arranged contacts with coupler.
Optical current mutual inductor is the class in electronic current mutual inductor, comprises the optics, air core coil (may attach embedded integrator), the electric current-electric pressure converter (may be furnished with electronic device) with the iron-core coil of integrated load that have electronic device.The high-pressure side of optical current mutual inductor is passive device, and not needing provides control power supply, and can detect alternating current component and DC component simultaneously.
For optical glass type current transformer, its basic functional principle is Faraday effect, and the external magnetic field be namely added on optical medium can make the effect of the rotation of the polarised light generation plane of polarization by optical medium.Its anglec of rotation Φ=V ∫
lhdl, wherein V is the Verdet constant of optical medium; L is the distance of light propagation in media as well; H is magnetic field intensity.When magnetic field H produces through the electric current I in the conductor of optical glass sensing head as shown in Figure 1, and when light path closes around current－carrying conductor, Ampere circuit law above formula is utilized to be rewritten as Φ=VN
li, wherein N
lclose the light path number of turns around current－carrying conductor.By Φ=VN
li is known, as long as measure the angle Φ of polarised light rotation, can calculate the size of electric current to be measured.Φ=VN
li also shows, the light path number of turns utilizing suitable light path design to increase around current－carrying conductor can improve sensing head sensitivity.
The optical material range of choice of optical glass type current transformer is wide, stability is better, precision is higher, affect less by linear birefrigence, but it is large to there is difficulty of processing, sensing head is frangible, high in cost of production shortcoming, and the reflection phase shift that light is introduced in reflection process can make line polarisation become elliptically polarized light and influential system performance.For overcoming the impact of reflection phase shift, the present invention proposes biorthogonal mirroring scheme.Shown in Fig. 2 is the index path of biorthogonal mirroring scheme, as shown in Figure 2, biorthogonal mirroring scheme is that each pip place two secondary reflections replace original primary event in the optical path, and making second time s, p component of reverberation and the lucky half-twist of s, p component of first reflection light, the phase shift causing two secondary reflections to produce cancels each other.
Do not produce the principle of reflection phase shift based on reflection at critical angle, propose the design of triangle sensing head and the design of jaw type sensing head.Such scheme possesses structure advantage simple or easy to use.Because reflection at critical angle scheme is very high to sensing head requirement on machining accuracy, therefore seldom use.
For all-fiber current transformator, its operation principle is Faraday magnetooptical effect and magnetostrictive effect.Faraday magnetooptical effect refer to when a branch of linearly polarized light along the direction parallel with magnetic field by magneto-optic memory technique time, generation deflects by the plane of oscillation of linearly polarized light, and the size of line polarisation plane of oscillation deflection angle is directly proportional to the path distance that magnetic field intensity and light experience in magnetic field.
If Path-sensitive is closed circuit, the magnetic field so produced through the electric current of responsive loop will act on closed circuit, and the large young pathbreaker producing faraday's phase angle observes Ampere circuit law.By the deflection angle size of the linearly polarized light plane of oscillation of magneto-optic memory technique (optical fiber or magneto-optic glass), be directly proportional to the number of turn of optical loop and through the total current of optical loop.If we can the po-larization rotational angular of sensed light signal, just can obtain corresponding tested current value, the general principle of Here it is Faraday magneto-optical effect current mutual inductor.
Shown in Fig. 3 is all-fiber current transformator fundamental diagram.As shown in Figure 3, the light that light source sends arrives after polarizer through coupler and is converted into linearly polarized light, enters phase-modulator and is decomposed into the orthogonal linearly polarized light of two bundles, propagate along in X-axis and Y-axis.Two restraint the light wave modulated enters fiber optic coils 32, under the effect in the magnetic field that electric current produces, produces the phase angle being proportional to carrier current between two-beam ripple.At bus-bar 31 place, two light waves through speculum 33 reflection and after exchanging, two-beam ripple turns back to phase-modulator, interfere after arriving polarizer, interference light signal enters photodetector through coupler, the voltage signal that detector exports is received union by signal processing circuit, and operation result is exported by digital interface.
Shown in Fig. 4 be electric current in all-fiber current transformator phase state change oscillogram.Left figure is bus-bar no current, and right figure is that bus-bar has electric current, and in two figure, top curve is input current, and lower curve is output current.When not having electric current in bus-bar, the relative propagation velocity of two light waves remains unchanged, and namely physically said do not have phase difference, and the phase difference of two-beam signal is zero, and it is also zero that signal processing circuit exports; When have electric current by time, under the magnetic fields around electrical conductor, there is relatively change in two-beam velocity of wave propagation, namely there is a phase difference in two-beam signal, wherein, N is the number of turn of optical fiber, and V is Wei Erde constant, I is tested electric current, the interference light intensity at what the existence of phase difference finally showed is detector place there occurs change, by measuring the size of light intensity, can measure corresponding size of current, signal processing circuit carries out demodulation to phase difference, obtains tested current digital value and exports.
The optical fiber of all-fiber current transformator itself is sensing head, avoids the adverse effect that in optical glass type current transformer, reflection phase shift, linear birefrigence cause systematic function.
Use the way circuit figure of the STATCOM static passive compensation device of all-fiber current transformator as shown in Figure 5, the electric current that OCT1, OCT2, OCT3 export for measuring three-phase change of current chain, primary side big current is converted to small area analysis and is sent to master controller, it is converted, calculates target control amount, the object that implement device dynamic compensation is idle.
Compared with traditional electromagnetic current transducer, all-fiber current transformator is applied to during high-voltage large current is measured has significantly actively technique effect: all-fiber current transformator is oil-containing not, without explosion hazard; Completely isolated with high-tension line, meet insulating requirements, safe and reliable to operation; Not containing unshakable in one's determination, without magnetic saturation, ferromagnetic resonance and hysteresis; Not containing AC coil, there is not output winding open circuit dangerous, can direct current be measured; Also comprise in addition electromagnetism interference, response frequency domain wide, be convenient to remote sensing and remote measurement, do not need to provide and control power supply, little, lightweight, the easy installation of volume, digital output, the plurality of advantages such as sensitivity is high.
In sum, by means of technique scheme of the present invention, general electromagnetic current transducer is substituted by using optical current mutual inductor, solve traditional electromagnetic current transducer range of dynamic measurement little, frequency band is narrow, be subject to electromagnetic interference, easily magnetic saturation unshakable in one's determination under fault current, there is hysteresis, the problem that the shortcomings such as DC component can not be avoided simultaneously cannot be measured, volume can be used little, cost is low, good insulating, range of dynamic measurement is large and can gather the DC component of electric current and the better acquisition system electric current of current transformer of alternating current component simultaneously, for system provides high-quality dynamic passive compensation and burning voltage, in addition, all-fiber current transformator is applied to during high-voltage large current is measured has obviously more positive technique effect: not oil-containing, without explosion hazard, completely isolated with high-tension line, meet insulating requirements, safe and reliable to operation, not containing unshakable in one's determination, without magnetic saturation, ferromagnetic resonance and hysteresis, not containing AC coil, there is not output winding open circuit dangerous, can direct current etc. be measured.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a STATCOM static passive compensation device, comprising:
Voltage source converter, described voltage source converter is the alternating current-direct current converting apparatus of the device composition with turn-off capacity, described voltage source converter is electrically connected to linked reactor, direct current capacitor and optical current mutual inductor, data for returning according to optical current mutual inductor regulate amplitude and the phase place of AC output voltage, make device absorb or send the reactive current met the demands;
Direct current capacitor, contact in described direct current capacitor and service entrance switch loop, described direct current capacitor is the energy storage original paper of voltage source converter, for DC voltage being converted to the alternating voltage with network system same frequency;
Service entrance switch loop, described service entrance switch loop and direct current capacitor are contacted, for controlling the operating state of direct current capacitor;
Linked reactor, described linked reactor is connected in parallel to described voltage source converter and optical current mutual inductor, for providing the reactance of coupling for voltage source converter;
Optical current mutual inductor, described optical current mutual inductor is connected in parallel to described linked reactor and network system, for the current alternating component in detection of grid system and DC component, and the data detected is sent to voltage source converter.
2. a kind of STATCOM static passive compensation device according to claim 1, is characterized in that, described optical current mutual inductor is passive device, and described optical current mutual inductor is one of following: optical glass type current transformer, all-fiber current transformator.
3. a kind of STATCOM static passive compensation device according to claim 2, is characterized in that, described optical current mutual inductor is optical glass type current transformer; Use the reflection phase shift that biorthogonal mirroring scheme elimination light is introduced in reflection process, wherein, described biorthogonal mirroring scheme is that each pip place two secondary reflections replace original primary event in the optical path.
4. a kind of STATCOM static passive compensation device according to claim 2, is characterized in that, described optical current mutual inductor is all-fiber current transformator; Each STATCOM static passive compensation device comprises three groups of identical circuit, often organize circuit for measuring the phase in three-phase change of current chain output current, often organize circuit and include an all-fiber current transformator, each all-fiber current transformator described is all arranged contacts with coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410710906.2A CN104377712A (en) | 2014-11-28 | 2014-11-28 | STATCOM (static VAR compensator) |
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| CN201410710906.2A CN104377712A (en) | 2014-11-28 | 2014-11-28 | STATCOM (static VAR compensator) |
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Citations (4)
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|---|---|---|---|---|
| US20060126990A1 (en) * | 2004-12-13 | 2006-06-15 | General Electric Company | Magneto-optical sensors |
| JP2007087154A (en) * | 2005-09-22 | 2007-04-05 | Toshiba Mitsubishi-Electric Industrial System Corp | Controller for semiconductor switch |
| CN102044879A (en) * | 2010-12-31 | 2011-05-04 | 中电普瑞科技有限公司 | Movable type static synchronous compensator (STATCOM) with modularization structure |
| CN204205613U (en) * | 2014-11-28 | 2015-03-11 | 中电博瑞技术（北京）有限公司 | A kind of STATCOM static passive compensation device |
-
2014
- 2014-11-28 CN CN201410710906.2A patent/CN104377712A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060126990A1 (en) * | 2004-12-13 | 2006-06-15 | General Electric Company | Magneto-optical sensors |
| JP2007087154A (en) * | 2005-09-22 | 2007-04-05 | Toshiba Mitsubishi-Electric Industrial System Corp | Controller for semiconductor switch |
| CN102044879A (en) * | 2010-12-31 | 2011-05-04 | 中电普瑞科技有限公司 | Movable type static synchronous compensator (STATCOM) with modularization structure |
| CN204205613U (en) * | 2014-11-28 | 2015-03-11 | 中电博瑞技术（北京）有限公司 | A kind of STATCOM static passive compensation device |
Non-Patent Citations (1)
| Title |
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| 王政平等: "光学玻璃电流互感器研究进展", 《激光与光电子学进展》 * |
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Application publication date: 20150225 |