CN107394796A - A kind of three level comprehensive compensation systems and its detection method based on three-stage SVPWM modulation - Google Patents
A kind of three level comprehensive compensation systems and its detection method based on three-stage SVPWM modulation Download PDFInfo
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- CN107394796A CN107394796A CN201710676585.2A CN201710676585A CN107394796A CN 107394796 A CN107394796 A CN 107394796A CN 201710676585 A CN201710676585 A CN 201710676585A CN 107394796 A CN107394796 A CN 107394796A
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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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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/525—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform or frequency
- H02M7/527—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform or frequency by pulse width modulation
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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]
-
- 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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- Power Engineering (AREA)
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Abstract
The present invention relates to Power Quality Detection and the technical field of improvement, more particularly, to a kind of three level comprehensive compensation systems based on three-stage SVPWM modulation.The three level comprehensive compensation systems based on three-stage SVPWM modulation of the present invention, using three level SVG as core, take three-stage SVPWM modulation system；Including three level SVG main circuits, compensation current detection module and SVPWM modulation modules, given electric current is calculated by compensating current detection module, and given current signal is input to SPVWM modulation modules, generate the control signal of the level main circuits of SVG tri-, the level main circuits of SVG tri- are controlled, generate required compensation electric current；The SVPWM modulation systems of three-stage, only No. 2 switch switchings in the monocycle are less compared with the SVPWM modulation systems switch switching times of seven segmentations, smaller switching loss can be obtained, system harmonicses content is further improved, and simple system, precise control, it is easy to accomplish.
Description
Technical field
The present invention relates to Power Quality Detection and the technical field administered, three-stage is based on more particularly, to one kind
Three level comprehensive compensation systems of SVPWM modulation.
Background technology
With the development of Power Electronic Technique, based on the static reacance generator of all-controlling power electronics device in power train
Extensive research and development has been obtained in system.Static reacance generator (SVG) is parallel in power network, the nothing variable equivalent to one
Work(current source, its reactive current can rapidly follow the change of reactive load electric current and change, nothing needed for self compensating system
Work(power.Its general principle is that utilization can turn off device for high-power power electronic (IGBT) composition from commutation bridge circuit, is passed through
Reactor or capacitor are connected in parallel on power network, suitably adjust the amplitude and phase of bridge circuit AC output voltage, or
Directly control its ac-side current, so that it may so that the circuit absorbs or sent the reactive current for meeting to require, realize dynamic nothing
The purpose of work(compensation.Currently used static no work generator is mainly two level SVG, is rarely had using three level SVG, and three electricity
Flat relative two level topologys have that harmonic wave is few, loss is small, switching frequency is high, efficiency high, cost-effective several big advantages.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind using three level SVG as core, with reference to three sections
Three level comprehensive compensation systems of the modulation system of formula space vector impulse modulation (SVPWM).
In order to solve the above technical problems, the technical solution adopted by the present invention is：
There is provided it is a kind of based on three-stage SVPWM modulation three level comprehensive compensation systems, including three level SVG main circuits,
Current detection module and SVPWM modulation modules are compensated, the compensation current detection module is used for the three-phase electricity for detecting three-phase circuit
Stream, three-phase current is calculated into three-phase compensation electric current, and three-phase compensating current signal is launched to SVPWM modulation modules；
The SVPWM modulation modules are used for three level SVG main circuit emissioning controling signals；The three level SVG main circuits are used to connect
The signal of SVPWM modulation modules is received, and generates required compensation electric current.
The three level comprehensive compensation systems based on three-stage SVPWM modulation of the present invention, including three level SVG main circuits,
Current detection module and SVPWM modulation modules are compensated, given electric current is calculated by compensating current detection module, and by given electricity
Stream signal is input to SPVWM modulation modules, generates the control signal of the level main circuits of SVG tri-, and the level main circuits of SVG tri- are carried out
Control, generates required compensation electric current, and simple in construction, precise control, practical.
Preferably, the SVG main circuits include the direct current capacitors C1 for DC energy storage, can turn off big work(for controlling
The voltage source converter of rate power electronic devices switch on and off, the coupling transformation for voltage source converter to be accessed to power system
Device CT, some IGCT VT for the control signal launched for receiving SVPWM modulation modules and some and IGCT VT inverse parallels
Diode D；The voltage source converter is formed by that can turn off device for high-power power electronic, and the voltage source converter can
Device for high-power power electronic can be turned off by SVPWM technical controllings to switch on-off.By high-power electric and electronic switching device
The voltage source converter VSC of composition, will by the break-make of space vector impulse modulation SVPWM technical controlling electronic power switches
DC voltage conversion on capacitor is the alternating voltage with certain frequency and amplitude.
Preferably, the compensation current detection module includes adjuster PI, along change device C32, inverter C23 and low pass filtered
Ripple device LPF, described to be communicated to connect along change device C32, low pass filter LPF, inverter C23, the adjuster PI low pass filters
LPF is communicated to connect.Power network current is by the suitable device C32 that becomes by three-phase current ia、ib、icIt is changed into two-phase iα、iβ, by low pass filter
LPF obtains fundamental active component iαp、iβpAnd reactive component iαq、iβq, through inverter C23 by active component iαp、iβpBe converted to
Three-phase watt current iap、ibp、icp。
Preferably, the SVPWM modulation modules are specially the modulator using the SVPWM modulation systems of three-stage.Three sections
The SVPWM modulation systems of formula, only No. 2 switch switchings in the monocycle, though the SVPWM modulation system switch periods phases compared with seven segmentations
Together, but switch switching times are less, can obtain smaller switching loss, and system harmonicses content is further improved, and three
Segmentation modulating system is more simple, it is easy to accomplish.
Preferably, the detection method that the compensation current detection module uses is as follows：
S1. the magnitude of current i of three-phase circuit is detected firsta、ib、ic, and the magnitude of current under three phase coordinate systems is passed through along change device C32
It is converted under alpha-beta two-phase orthogonal coordinate system, conversion method is as follows：
Wherein, ia,ib,icEach phase current respectively in three-phase electrical power system；iα、iβIt is three-phase current instantaneous value in alpha-beta two
The transformed value of phase orthogonal coordinate system；C32For conversion coefficient；
S2. after step S1, by the transformed value i of the alpha-beta two-phase orthogonal coordinate system of three-phase current instantaneous valueα、iβThrough low pass
Wave filter LPF obtains active component iαp、iβpWith reactive component iαq、iβq；Active component iαp、iβpWith reactive component iαq、iβqMeter
Calculation method is as follows：
Wherein, vector iα、iβResultant current vector i, | i | it is the mould of voltage vector and current phasor,Respectively electric current is sweared
The argument of amount；iαpFor iαActive component, iαqFor iαReactive component,For the argument of current phasor；
S3. upon step s 2, DC capacitor voltage U is detecteddc, and with DC voltage reference value UdrefCompare
Go out error signal, after adjusted device PI respectively with iαActive component iαp、iβActive component iβpSuperposition, iα、iβReactive component
iαq、iβqZero setting；I after superpositionαp、iβpWith the i of zero settingαq、iβqPassing through inverter C23Rotation contravariant is changed to three-phase watt current
iap、ibp、icp, three-phase watt current iap、ibp、icpMade the difference respectively with power network current, that is, obtain required given electric current iag、ibg、
icg；
S4. after step s 3, by given electric current iag、ibg、icgSignal, which is launched to SVPWM modulation modules, given electric current, to be led to
The control signal of SVPWM modulation modules generation IGCT is crossed, the level main circuits of SVG tri- is controlled, generates required compensation electric current.
Compared with prior art, the beneficial effects of the invention are as follows：
The three level comprehensive compensation systems based on three-stage SVPWM modulation of the present invention, using three level SVG as core, are adopted
Take three-stage SVPWM modulation system；Including three level SVG main circuits, current detection module and SVPWM modulation modules are compensated,
Given electric current is calculated by compensating current detection module, and given current signal is input to SPVWM modulation modules, is generated
The control signal of the level main circuits of SVG tri-, the level main circuits of SVG tri- are controlled, generate required compensation electric current；Three-stage
SVPWM modulation systems, only No. 2 switch switchings in the monocycle, compared with seven segmentations SVPWM modulation systems switch switching times more
It is few, smaller switching loss can be obtained, system harmonicses content is further improved, and simple system, precise control, is easy to
Realize.
Brief description of the drawings
Fig. 1 is the structured flowchart of the three level comprehensive compensation systems based on three-stage SVPWM modulation of embodiment one；
Fig. 2 is three level SVG main circuit diagrams；
Fig. 3 compensates the detection principle diagram of electric current；
Fig. 4 is three-stage SVPWM switching waveform figures.
Embodiment
With reference to embodiment, the present invention is further illustrated.Wherein, being given for example only property of accompanying drawing illustrates,
What is represented is only schematic diagram, rather than pictorial diagram, it is impossible to is interpreted as the limitation to this patent；In order to which the reality of the present invention is better described
Example is applied, some parts of accompanying drawing have omission, zoomed in or out, and do not represent the size of actual product；To those skilled in the art
For, some known features and its explanation may be omitted and will be understood by accompanying drawing.
Same or analogous label corresponds to same or analogous part in the accompanying drawing of the embodiment of the present invention；In retouching for the present invention
In stating, it is to be understood that if it is based on accompanying drawing to have the orientation of the instructions such as term " on ", " under ", "left", "right" or position relationship
Shown orientation or position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply meaning
Device or element must have specific orientation, with specific azimuth configuration and operation, therefore position relationship described in accompanying drawing
Term being given for example only property explanation, it is impossible to the limitation to this patent is interpreted as, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment 1
Three level for the three-stage SCPWM modulation of the present invention integrate the first of replenishment system and implemented as shown in Figures 1 to 4
Example, including three level SVG main circuits, compensation current detection module and SVPWM modulation modules, compensation current detection module are used to examine
The three-phase current of three-phase circuit is surveyed, three-phase current is calculated into three-phase compensation electric current, and three-phase compensating current signal is sent out
It is incident upon SVPWM modulation modules；SVPWM modulation modules are used for three level SVG main circuit emissioning controling signals；Three level SVG masters
Circuit is used for the signal for receiving SVPWM modulation modules, and generates required compensation electric current.
As shown in figure 1, calculating given electric current by compensating current detection module, and given current signal is input to
SPVWM modulation modules, the control signal of the level main circuits of SVG tri- is generated, the level main circuits of SVG tri- are controlled, generate institute
The compensation electric current needed.
Specifically, as shown in Fig. 2 SVG main circuits include the direct current capacitors C1 for DC energy storage, can closed for controlling
The voltage source converter of disconnected device for high-power power electronic switch on and off, the coupling for voltage source converter to be accessed to power system
Close transformer CT, some IGCT VT for the control signal launched for receiving SVPWM modulation modules and some and IGCT VT
Antiparallel diode D；Voltage source converter is formed by that can turn off device for high-power power electronic, and can pass through SVPWM technologies
Control can turn off device for high-power power electronic and switch on-off.
As shown in figure 3, compensation current detection module includes adjuster PI, along change device C32, inverter C23 and LPF
Device LPF, communicated to connect along device C32, low pass filter LPF, inverter C23 is become, adjuster PI low pass filter LPF communication links
Connect.Power network current is by the suitable device C32 that becomes by three-phase current ia、ib、icIt is changed into two-phase iα、iβ, base is obtained by low pass filter LPF
Ripple active component iαp、iβpAnd reactive component iαq、iβq, through inverter C23 by active component iαp、iβpBe converted to the active electricity of three-phase
Flow iap、ibp、icp；Specific detection method is as follows：
S1. the magnitude of current i of three-phase circuit is detected firsta、ib、ic, and the magnitude of current under three phase coordinate systems is passed through along change device C32
It is converted under alpha-beta two-phase orthogonal coordinate system, conversion method is as follows：
Wherein, ia,ib,icEach phase current respectively in three-phase electrical power system；iα、iβIt is three-phase current instantaneous value in alpha-beta two
The transformed value of phase orthogonal coordinate system；C32For conversion coefficient；
S2. after step S1, by the transformed value i of the alpha-beta two-phase orthogonal coordinate system of three-phase current instantaneous valueα、iβThrough low pass
Wave filter LPF obtains active component iαp、iβpWith reactive component iαq、iβq；Active component iαp、iβpWith reactive component iαq、iβqMeter
Calculation method is as follows：
Wherein, vector iα、iβResultant current vector i, | i | it is the mould of voltage vector and current phasor,Respectively electric current is sweared
The argument of amount；iαpFor iαActive component, iαqFor iαReactive component,For the argument of current phasor；
S3. upon step s 2, DC capacitor voltage U is detecteddc, and with DC voltage reference value UdrefCompare
Go out error signal, after adjusted device PI respectively with iαActive component iαp、iβActive component iβpSuperposition, iα、iβReactive component
iαq、iβqZero setting；I after superpositionαp、iβpWith the i of zero settingαq、iβqPassing through inverter C23Rotation contravariant is changed to three-phase watt current
iap、ibp、icp, three-phase watt current iap、ibp、icpMade the difference respectively with power network current, that is, obtain required given electric current iag、ibg、
icg；
S4. after step s 3, by given electric current iag、ibg、icgSignal, which is launched to SVPWM modulation modules, given electric current, to be led to
The control signal of SVPWM modulation modules generation IGCT is crossed, the level main circuits of SVG tri- is controlled, generates required compensation electric current.
In addition, the SVPWM switching waveform figures of three-stage are illustrated in figure 4, only No. 2 switch switchings in the monocycle, though compared with
The SVPWM modulation system switch periods of seven segmentations are identical, but switch switching times are less, can obtain smaller switching loss, be
System harmonic content is further improved, and three-stage modulating system is more simple, it is easy to accomplish.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (5)
1. a kind of three level comprehensive compensation systems based on three-stage SVPWM modulation, including by high-power electric and electronic can be turned off
The bridge circuit of device composition；Characterized in that, the bridge circuit is specially the voltage-type bridge circuit using three level
SVG main circuits；It is described based on three-stage SVPWM modulation three level comprehensive compensation systems also include compensation current detection module and
SVPWM modulation modules, the compensation current detection module are used for the three-phase current for detecting three-phase circuit, three-phase current are computed
Three-phase compensation electric current is obtained, and three-phase compensating current signal is launched to SVPWM modulation modules；The SVPWM modulation modules are used
In to three level SVG main circuit emissioning controling signals；The three level SVG main circuits are used for the letter for receiving SVPWM modulation modules
Number, and generate compensation electric current.
2. the three level comprehensive compensation systems according to claim 1 based on three-stage SVPWM modulation, it is characterised in that
The SVG main circuits include the direct current capacitors C1 for DC energy storage, can turn off device for high-power power electronic for controlling
The voltage source converter of switch on and off, for by voltage source converter access power system coupling transformer CT, for receiving
Some IGCT VT and some and antiparallel diode D of IGCT VT of the control signal of SVPWM modulation modules transmitting；It is described
Voltage source converter is formed by that can turn off device for high-power power electronic, and the voltage source converter can pass through SVPWM technologies
Control can turn off device for high-power power electronic and switch on-off.
3. the three level comprehensive compensation systems according to claim 1 based on three-stage SVPWM modulation, it is characterised in that
The current detection module that compensates includes adjuster PI, along change device C32, inverter C23 and low pass filter LPF, the suitable change
Device C32, low pass filter LPF, inverter C23 communication connections, the adjuster PI low pass filters LPF communication connections.
4. the three level comprehensive compensation systems according to claim 1 based on three-stage SVPWM modulation, it is characterised in that
The SVPWM modulation modules are specially the modulator using the SVPWM modulation systems of three-stage.
5. the detection method of the three level comprehensive compensation systems based on three-stage SVPWM modulation described in as requested 3, its feature
It is, step is as follows：
S1. the magnitude of current i of three-phase circuit is detected firsta、ib、ic, and by the magnitude of current i under three phase coordinate systemsa、ib、icThrough along change
Device C32It is converted under alpha-beta two-phase orthogonal coordinate system, conversion method is as follows：
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Wherein, ia,ib,icEach phase current respectively in three-phase electrical power system；iα、iβFor three-phase current instantaneous value in alpha-beta two-phase just
Hand over the transformed value of coordinate system；C32For conversion coefficient；
S2. after step S1, by the transformed value i of the alpha-beta two-phase orthogonal coordinate system of three-phase current instantaneous valueα、iβIt is low-pass filtered
Device LPF obtains active component iαp、iβpWith reactive component iαq、iβq；Active component iαp、iβpWith reactive component iαq、iβqCalculating side
Method is as follows：
Wherein, vector iα、iβResultant current vector i, | i | it is the mould of voltage vector and current phasor,Respectively current phasor
Argument；iαpFor iαActive component, iαqFor iαReactive component,For the argument of current phasor；
S3. upon step s 2, DC capacitor voltage U is detecteddc, and with DC voltage reference value UdrefCompare and draw mistake
Difference signal, after adjusted device PI respectively with iαActive component iαp、iβActive component iβpSuperposition, iα、iβReactive component iαq、
iβqZero setting；I after superpositionαp、iβpWith the i of zero settingαq、iβqPassing through inverter C23Rotation contravariant is changed to three-phase watt current iap、
ibp、icp, three-phase watt current iap、ibp、icpRespectively with power network three-phase current ia、ib、icMake the difference, that is, obtain required given electricity
Flow iag、ibg、icg；
S4. after step s 3, by given electric current iag、ibg、icgSignal, which is launched to SVPWM modulation modules, given electric current, to be passed through
SVPWM modulation modules generate the control signal of IGCT, control the level main circuits of SVG tri-, generation compensation electric current.
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