CN207304010U - A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation - Google Patents
A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation Download PDFInfo
- Publication number
- CN207304010U CN207304010U CN201720992040.8U CN201720992040U CN207304010U CN 207304010 U CN207304010 U CN 207304010U CN 201720992040 U CN201720992040 U CN 201720992040U CN 207304010 U CN207304010 U CN 207304010U
- Authority
- CN
- China
- Prior art keywords
- svpwm modulation
- level
- current
- stage
- svpwm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
Power Quality Detection and the technical field administered are the utility model is related to, 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 utility model, using three level SVG as core, take the modulation system of three-stage SVPWM；Including three level SVG main circuits, compensation current detection module and SVPWM modulation modules, calculated by compensating current detection module to constant current, and given current signal is input to SPVWM modulation modules, generate the control signal of tri- level main circuits of SVG, tri- level main circuits of SVG are controlled, generate required compensation electric current；The SVPWM modulation systems of three-stage, only 2 switchings, less compared with the SVPWM modulation system switching numbers of seven segmentations in the monocycle, the switching loss of smaller can be obtained, system harmonics content is further improved, and simple system, precise control, it is easy to accomplish.
Description
Technical field
Power Quality Detection and the technical field administered are the utility model is related to, three sections are based on more particularly, to one kind
Three level comprehensive compensation systems of formula SVPWM modulation.
Background technology
With the development of Power Electronic Technique, based on the static reactive generator of all-controlling power electronics device in power train
Extensive research and development has been obtained in system.Static reactive generator (SVG) is parallel in power grid, 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 basic 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 grid, suitably adjust the amplitude and phase of bridge circuit exchange side output voltage, or
Directly control its ac-side current, so that it may so that the circuit absorbs or sends the reactive current met the requirements, 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 opposite two level topologys have that harmonic wave is few, loss is small, switching frequency is high, efficient, cost-effective several big advantages.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, there is provided and it is a kind of using three level SVG as core, with reference to
Three level comprehensive compensation systems of the modulation system of three-stage space vector impulse modulation (SVPWM).
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation are provided, including by high-power electricity can be turned off
The bridge circuit of power electronic device composition；The bridge circuit is specially the SVG master using the voltage-type bridge circuit of three level
Circuit；The three level comprehensive compensation systems based on three-stage SVPWM modulation further include compensation current detection module and SVPWM
Modulation module, the compensation current detection module are used for the three-phase current for detecting three-phase circuit, three-phase current are calculated
Three-phase compensates electric current, and three-phase compensating current signal is launched to SVPWM modulation modules；The SVPWM modulation modules be used for
Three level SVG main circuit emissioning controling signals；The three level SVG main circuits are used for the signal for receiving SVPWM modulation modules, and
Generation compensation electric current.
The three level comprehensive compensation systems based on three-stage SVPWM modulation of the utility model, including the three main electricity of level SVG
Road, compensation current detection module and SVPWM modulation modules, are calculated to constant current, and will give by compensating current detection module
Constant current signal is input to SPVWM modulation modules, the control signal of tri- level main circuits of SVG is generated, to tri- level main circuits of SVG
It is controlled, generates required compensation electric current, and it is simple in structure, precise control, highly 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 electric system
Device CT, some thyristor VT for the control signal launched for receiving SVPWM modulation modules and some and thyristor 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 filtering
Device LPF obtains fundamental active component iαp、iβpAnd reactive component iαq、iβq, through inverter C23 by active component iαp、iβpConversion
For three-phase watt current iap、 ibp、icp。
Compensation current detection module is detected 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
Bandpass filter LPF obtains active component iαp、iβpWith reactive component iαq、iβq；Active component iαp、iβpWith reactive component iαq、iβq's
Computational methods are 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、icpMake the difference, that is, obtain required to constant current i with power network current respectivelyag、ibg、
icg；
S4. after step s 3, constant current i will be givenag、ibg、icgSignal is launched to SVPWM modulation modules, leads to constant current
The control signal of SVPWM modulation modules generation thyristor is crossed, tri- level main circuits of SVG is controlled, generates required compensation electric current.
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 2 switchings in the monocycle, though the SVPWM modulation system switch periods phases compared with seven segmentations
Together, but switching number is less, can obtain the switching loss of smaller, and system harmonics content is further improved, and three
Segmentation modulating system is more simple, it is easy to accomplish.
Compared with prior art, the beneficial effects of the utility model are：
The three level comprehensive compensation systems based on three-stage SVPWM modulation of the utility model, using three level SVG as core
The heart, takes the modulation system of three-stage SVPWM；Including three level SVG main circuits, compensation current detection module and SVPWM modulation
Module, is calculated to constant current by compensating current detection module, and given current signal is input to SPVWM modulation modules,
The control signal of tri- level main circuits of SVG is generated, tri- level main circuits of SVG are controlled, generate required compensation electric current；Three
The SVPWM modulation systems of segmentation, only 2 switchings in the monocycle, compared with the SVPWM modulation system switchings of seven segmentations
Number is less, can obtain the switching loss of smaller, and system harmonics content is further improved, and simple system, and control is accurate
Really, it is easy to accomplish.
Brief description of the drawings
Fig. 1 is the structure diagram 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
The utility model is further described with reference to embodiment.Wherein, being given for example only property of attached drawing
Illustrate, expression is only schematic diagram, rather than pictorial diagram, it is impossible to is interpreted as the limitation to this patent；In order to which this reality is better described
With new embodiment, some components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To ability
For field technique personnel, some known features and its explanation may be omitted and will be understood by attached drawing.
The same or similar label correspond to the same or similar components in the attached drawing of the utility model embodiment；In this practicality
In new description, it is to be understood that if thering is the orientation of the instructions such as term " on ", " under ", "left", "right" or the position relationship to be
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description, rather than instruction
Or imply that signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore retouched in attached drawing
State the term of position relationship only for illustration, it is impossible to the limitation to this patent is interpreted as, for the common skill of this area
For art personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiment 1
As shown in Figures 1 to 4 the first of replenishment system is integrated for the three-stage SCPWM of the utility model three level modulated
Embodiment, including three level SVG main circuits, compensation current detection module and SVPWM modulation modules, compensation current detection module are used
In the three-phase current of detection three-phase circuit, three-phase current is calculated into three-phase compensation electric current, and three-phase compensation electric current is believed
Number transmitting is to SVPWM modulation modules；SVPWM modulation modules are used for three level SVG main circuit emissioning controling signals；Three level
SVG main circuits are used for the signal for receiving SVPWM modulation modules, and generate required compensation electric current.
As shown in Figure 1, being calculated by compensating current detection module to constant current, and given current signal is input to
SPVWM modulation modules, generate the control signal of tri- level main circuits of SVG, tri- level main circuits of SVG are controlled, and 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 be 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 electric system
Close transformer CT, some thyristor VT for the control signal launched for receiving SVPWM modulation modules and some and thyristor 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 low-pass filtering
Device LPF, communicates to connect, adjuster PI low-pass filter LPF communication links along device C32, low-pass filter LPF, inverter C23 is become
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, obtained by low-pass filter LPF
Fundamental active component iαp、iβpAnd reactive component iαq、iβq, through inverter C23 by active component iαp、iβpIt is active to be converted to three-phase
Electric current iap、ibp、icp；Specifically detect 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：
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
Bandpass filter LPF obtains active component iαp、iβpWith reactive component iαq、iβq；Active component iαp、iβpWith reactive component iαq、iβq's
Computational methods are 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、icpMake the difference, that is, obtain required to constant current i with power network current respectivelyag、ibg、
icg；
S4. after step s 3, constant current i will be givenag、ibg、icgSignal is launched to SVPWM modulation modules, leads to constant current
The control signal of SVPWM modulation modules generation thyristor is crossed, tri- level main circuits of SVG is controlled, generates required compensation electric current.
In addition, the SVPWM switching waveform figures of three-stage are illustrated in figure 4, only 2 switchings in the monocycle, though compared with
The SVPWM modulation system switch periods of seven segmentations are identical, but switching number is less, can obtain the switching loss of smaller, be
System harmonic content is further improved, and three-stage modulating system is more simple, it is easy to accomplish.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made where within the spirit and principles of the present invention etc., should be included in
Within the protection domain of the utility model claims.
Claims (4)
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；It is 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 further 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 electric system coupling transformer CT, for receiving
Some thyristor VT and some and antiparallel diode D of thyristor 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720992040.8U CN207304010U (en) | 2017-08-09 | 2017-08-09 | A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720992040.8U CN207304010U (en) | 2017-08-09 | 2017-08-09 | A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207304010U true CN207304010U (en) | 2018-05-01 |
Family
ID=62448951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720992040.8U Active CN207304010U (en) | 2017-08-09 | 2017-08-09 | A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207304010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394796A (en) * | 2017-08-09 | 2017-11-24 | 广东电网有限责任公司云浮供电局 | A kind of three level comprehensive compensation systems and its detection method based on three-stage SVPWM modulation |
-
2017
- 2017-08-09 CN CN201720992040.8U patent/CN207304010U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394796A (en) * | 2017-08-09 | 2017-11-24 | 广东电网有限责任公司云浮供电局 | A kind of three level comprehensive compensation systems and its detection method based on three-stage SVPWM modulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109830966B (en) | Three-phase four-wire system electric energy quality comprehensive treatment device and control method and system thereof | |
| CN103683288A (en) | Parallel active filter based on modularization multi-level converter and control method of parallel active filter | |
| CN106411161B (en) | Three-Phase PWM Converter and its optimal control method under the conditions of a kind of Voltage unbalance | |
| CN103475250A (en) | General loop current control method for modular multi-level converter considering low frequency oscillation | |
| CN104242712A (en) | Inverter parallel system and control method thereof | |
| CN107947599A (en) | Electronic power convertor | |
| CN105071390B (en) | Control method of H-bridge three-level active power filter and system | |
| CN105024569A (en) | Branched structure modular multilevel converter suitable for low modulation ratio application | |
| CN104811071A (en) | Photovoltaic inverter and passive decoupling restraining method based on non-isolated LCL filtering | |
| CN102545675A (en) | Hybrid series H-bridge multi-level grid-connected inverter direct current bus voltage control method | |
| Vijaykumar et al. | Railway power supply system using modular multilevel converter with droop characteristics | |
| Rani et al. | Multilevel shunt active filter based on sinusoidal subtraction methods under different load conditions | |
| Dinesh et al. | Simulation of D-Statcom with hysteresis current controller for harmonic reduction | |
| CN207304010U (en) | A kind of three level comprehensive compensation systems based on three-stage SVPWM modulation | |
| CN103515970A (en) | Three-bridge-arm compensation device for reactive power and non-symmetrical compensation for electrified railway | |
| CN109450267A (en) | A kind of boost control method based on the active third-harmonic zero-sequence voltage converter of mixing | |
| Sędłak et al. | Operation of four-leg three-level flying capacitor grid-connected converter for RES | |
| Zhou et al. | Control strategies for microgrid power quality enhancement with back-to-back converters connected to a distribution network | |
| CN108711870B (en) | Static reactive compensator control strategy based on energy unidirectional flow controllable rectifier | |
| CN107785934B (en) | Five-phase photovoltaic inverter system and control method thereof | |
| Lin et al. | Analysis and implementation of a three-level active filter with a reduced number of power semiconductors | |
| CN207150174U (en) | A kind of three level comprehensive compensation systems for balancing midpoint potential | |
| Wei et al. | A three-phase PWM rectifier with reactive power compensation function | |
| CN208797583U (en) | A kind of modular multilevel Active Power Filter-APF based on harmonics compensation | |
| Ramesh et al. | Power transfer capability & reliability improvement in a transmission line using distributed power-flow controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210222 Address after: Room 501-503, annex building, Huaye building, No.1-3 Chuimao new street, Xihua Road, Yuexiu District, Guangzhou City, Guangdong Province 510000 Patentee after: China Southern Power Grid Power Technology Co.,Ltd. Address before: No.3, Jinfeng Road, Yuncheng district, Yunfu City, Guangdong Province, 527300 Patentee before: YUNFU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID Co.,Ltd. |