CN103457501B - SVG modulator approach based on PAM+PWM cascaded multilevel inverter - Google Patents
SVG modulator approach based on PAM+PWM cascaded multilevel inverter Download PDFInfo
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Abstract
The invention provides the modulator approach of a kind of SVG based on PAM+PWM cascaded multilevel inverter, comprise the following steps: step S1: PAM regulation is carried out for PAM unit, optimizing PAM control algolithm by fundamental frequency, the staircase waveform making described PAM unit export approaches sine wave；Step S2: carry out PWM regulation for described PWM unit, controls technology by following-up type PWM and output reactive current instantaneous value is carried out feedback control.Technical scheme, due to PAM, to work in its switching loss under fundamental frequency switching frequency less；Harmonic component in PAM unit output staircase waveform is compensated by PWM unit, significantly reduces voltage x current aberration rate, improves the quality of device output electric current；Using current direct control method, its control accuracy and response speed improve a lot.
Description
Technical field
The present invention relates to technical field of electricity, particularly a kind of based on PAM+PWM cascade connection multi-level inversion
The SVG modulator approach of device.
Background technology
In recent years, the electric power industry development of China is rapid, and Large Copacity impact, interference load increase day by day
Many, power system stability, safe operation are caused potential threat.And set based on computer-controlled industry
Standby the most sensitive to the quality of power supply, cause load side more and more higher to the requirement of the quality of power supply.Static same
Step compensator (SVG) is by compensating idle, it is possible to increase system power factor, minimizing power damage
Consumption, raising power supply quality.Wherein, cascade SVG is because power capacity is big, switching frequency is low, output harmonic wave
The advantages such as little, fast response time are increasingly widely applied in high-voltage large-capacity occasion.
Cascade SVG is divided into pulse amplitude to modulate (PAM) and pulse width modulation in modulator approach
(PWM).PAM modulation is by choosing switch angle to reduce low-order harmonic, to make total harmonic distortion factor
Minimum modulator approach.Its switching device works under fundamental frequency switching frequency 50Hz, and its switching loss is relatively
Little, but the amplitude of output reactive voltage is adjusted by regulation switch angle in real time, also exist non-linear
The problem of equation group Real-time solution difficulty, when cascaded H-bridges number is less in addition, harmonic wave of output voltage content
Bigger.PWM method, by comparing modulating wave and carrier wave, controls switching device break-make, it is achieved electricity
Pressure output.But in PWM method, its switching device works in opening of hundreds of or even thousand hertz
Closing under frequency, its switching loss is bigger.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of based on PAM+PWM cascade connection multi-level inversion
The modulator approach of the SVG of device, it is characterised in that the topological structure of described SVG includes the first Cascade H
Bridge, the second cascaded H-bridges, third level connection H bridge, fourth stage connection H bridge and level V connection H bridge, wherein,
Connection H bridge composition PAM is mono-for first cascaded H-bridges, the second cascaded H-bridges, third level connection H bridge, the fourth stage
Unit, level V connection H bridge constitutes PWM unit, wherein, described modulator approach bag with described PAM unit
Include below step:
Step S1: carry out PAM regulation for PAM unit, optimizes PAM control algolithm by fundamental frequency,
The staircase waveform making described PAM unit export approaches sine wave；
Step S2: carry out PWM regulation for described PWM unit, controls skill by following-up type PWM
Art carries out feedback control to output reactive current instantaneous value.
It is preferred that the fundamental frequency optimized algorithm in described step S1 farther includes:
Step S11: according to controlling target, definition optimal objective function:
Step S12: use interative computation method to solve described optimal objective function, draw each cascaded H-bridges
Switch angle；
Step S13: the switch angle of described each cascaded H-bridges drawn is used for each H bridge switch device
Turn-on and turn-off.
It is preferred that described step S12 specifically includes:
(area equivalent principle is equal to just be enclosed by the rectangular area of staircase waveform one-level to use area equivalent principle
The area of string ripple) obtain initial switch angle, initial value substitution is iterated computing and solves optimal function
The switch angle of each cascaded H-bridges described can be calculated.
It is preferred that described step S1 farther includes: described PAM unit DC side is used arteries and veins
Rush rotation control, make described PAM unit DC voltage equal on average, it is ensured that each H bridge is straight
The stream side balance of voltage.
It is preferred that described step S2 specifically includes:
Step S21: described PWM unit DC side desired voltage values is subtracted each other with actual voltage value, and warp
Cross PI regulation and constitute outer voltage；
Step S22: reference current and device are exported current subtraction, and constitutes in electric current after PI regulates
Ring；
Step S23: the difference of system voltage with described PAM unit output voltage is adjusted as PWM unit
A part for ripple processed, to compensate the harmonic wave of described PAM unit output；
Step S24: the modulating wave of above-mentioned steps gained is carried out standardization, i.e. divided by described PWM unit
DC voltage, with the impact suppressing the fluctuation of DC voltage to respond control；
Wherein, reference current is to be added and obtain by with reference to reactive current and reference watt current, with reference to having
Merit electric current can be obtained by outer voltage output.
Owing to using above-mentioned technical scheme so that the invention have the advantages that
It is less that 1.PAM works in its switching loss under fundamental frequency switching frequency；
Harmonic component in PAM unit output staircase waveform is compensated by 2.PWM unit, effectively drops
Low voltage x current aberration rate, improves the quality of device output electric current；
3. using current direct control method, its control accuracy and response speed improve a lot.
Accompanying drawing explanation
Fig. 1 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach flow chart；
Fig. 2 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach in the topology diagram of cascade SVG；
Fig. 3 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach in PAM unit output step doping figure；
Fig. 4 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach in PWM unit control principle drawing；
Fig. 5 a be a specific embodiment of the present invention based on PAM+PWM cascade connection multi-level inversion
Cascade SVG output voltage superposed waveform figure in the SVG modulator approach of device；
Fig. 5 b be a specific embodiment of the present invention based on PAM+PWM cascade connection multi-level inversion
Each single-phase inversion H bridge pulse cycle control flow chart in the SVG modulator approach of device；
Fig. 6 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach in the control principle drawing of PWM unit；
Fig. 7 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach in PWM regulation is carried out for PWM unit, controlled by following-up type PWM
Technology processed carries out the flow chart of feedback control to output reactive current instantaneous value.
Detailed description of the invention
Below in conjunction with Figure of description come the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach is described in further detail.
Fig. 1 be a specific embodiment of the present invention based on PAM+PWM cascaded multilevel inverter
SVG modulator approach flow chart；Fig. 2 be a specific embodiment of the present invention based on
The topology diagram of the cascade SVG in the SVG modulator approach of PAM+PWM cascaded multilevel inverter；
Fig. 3 is the based on PAM+PWM cascaded multilevel inverter of a specific embodiment of the present invention
PAM unit output step doping figure in SVG modulator approach；Fig. 4 is a concrete reality of the present invention
Execute the PWM in the SVG modulator approach based on PAM+PWM cascaded multilevel inverter of mode mono-
Unit's control principle drawing；Fig. 5 a is cascading based on PAM+PWM of a specific embodiment of the present invention
Cascade SVG output voltage superposed waveform figure in the SVG modulator approach of multi-electrical level inverter；Fig. 5 b is
The SVG based on PAM+PWM cascaded multilevel inverter of a specific embodiment of the present invention adjusts
Each single-phase inversion H bridge pulse cycle control flow chart in method processed；Fig. 6 is a concrete reality of the present invention
Execute the PWM in the SVG modulator approach based on PAM+PWM cascaded multilevel inverter of mode mono-
The control principle drawing of unit；Fig. 7 is cascading based on PAM+PWM of a specific embodiment of the present invention
The SVG modulator approach of multi-electrical level inverter carries out PWM regulation for PWM unit, by with
Track type PWM controls technology and output reactive current instantaneous value carries out flow chart such as Fig. 1 institute of feedback control
Show, the SVG based on PAM+PWM cascaded multilevel inverter of one detailed description of the invention of the present invention
Modulator approach comprises the following steps:
Step S1: carry out PAM regulation for PAM unit, optimizes PAM control algolithm by fundamental frequency,
The staircase waveform making described PAM unit export approaches sine wave；
As in figure 2 it is shown, each module in the topological structure of cascade SVG is made up of a H bridge, point
It is not the first cascaded H-bridges, the second cascaded H-bridges, third level connection H bridge, fourth stage connection H bridge and level V
Connection H bridge, each H bridge therein has an independent capacitance.First cascaded H-bridges, the second cascaded H-bridges,
The third level connection H bridge, the fourth stage connection H bridge cascade constitute PAM unit, each H bridge have+E, 0 ,-E (E
Magnitude of voltage for each electric capacity) three level, i.e. four H bridges cascades can obtain 9 level.Level V
Connection H bridge constitutes PWM unit with PAM unit.
PAM cell operation, at fundamental frequency switching frequency, reduces switching loss.Fundamental frequency optimizes PAM and controls to calculate
Method is optimally to reduce the harmonic content in output voltage by the switch angle choosing each H bridge, from
And ensure under fundamental frequency switching frequency, obtain preferable harmonic performance.
As it is shown on figure 3, it is 4 cascaded H-bridges output voltage composite diagrams in PAM unit.According to greatly
The control requirement of capacity SVG, fundamental frequency optimizes the control target of PAM and is:
(1) fundamental voltage amplitude making total output voltage is control desired value,
(2) the low-order harmonic performance making total output voltage reaches optimum.
As shown in Figure 4, therefore, the fundamental frequency optimized algorithm in step S1 farther includes:
Step S11: according to controlling target, definition optimal objective function:
Step S12: use interative computation method to solve described optimal objective function, draw each cascaded H-bridges
Switch angle；
Specifically, use area equivalent principle, (area equivalent principle is that the rectangular area of staircase waveform one-level is equal to
The sinusoidal wave area enclosed) obtain initial switch angle, initial value substitution is iterated computing and solves
Optimal function can calculate the switch angle of each cascaded H-bridges.
Step S13: the switch angle of described each cascaded H-bridges drawn is used for each H bridge switch device
Turn-on and turn-off.
Above-mentioned control process, it is ensured that the total harmonic distortion of PAM unit output staircase waveform is minimum.
Meanwhile, step S1 may further comprise: and described PAM unit DC side is used pulse rotation control
System, makes described PAM unit DC voltage equal on average, it is ensured that each H bridge DC side voltage
Balance.
Pulse cycle control strategy makes within n cycle, and the meansigma methods of each H bridge DC side voltage is phase
Deng, thus ensure that device each DC voltage during steady-state adjustment process and transient state regulate is protected substantially
Hold consistent, and then effectively make cascade SVG dc-voltage balance.
As shown in figure 5 a and 5b, concrete pulse cycle control program is: owing to each H bridge is one
Angle of flow in the individual cycle is different, in order to make DC side balance on average, and the conducting of each H bridge
In each cycle rotation once, as a example by the detailed description of the invention of the present invention, four fundamental frequency cycles are complete for angle
Become once to circulate.
Then, Fig. 6 be a specific embodiment of the present invention based on PAM+PWM cascade connection multi-level
The control principle drawing of the PWM unit in the SVG modulator approach of inverter.Shown in Figure 6, enter
Row step S2: carry out PWM regulation for PWM unit, controls technology pair by following-up type PWM
Output reactive current instantaneous value carries out feedback control.
As it is shown in fig. 7, the control of PWM unit specifically includes:
Step S21: PWM unit DC side desired voltage values is subtracted each other with actual voltage value, and through PI
Regulation constitutes outer voltage；
Step S22: reference current and device are exported current subtraction, and constitutes in electric current after PI regulates
Ring；
Step S23: using the difference of system voltage and PAM unit output voltage as PWM cells modulate ripple
A part, with compensate described PAM unit output harmonic wave；
Step S24: the modulating wave of above-mentioned steps gained is carried out standardization, i.e. divided by described PWM unit
DC voltage, with the impact suppressing the fluctuation of DC voltage to respond control；
Wherein, reference current is to be added and obtain by with reference to reactive current and reference watt current, with reference to having
Merit electric current can be obtained by outer voltage output.
In sum, the grounded screen fault based on adaptive particle swarm optimization algorithm of the present invention of the present invention
Under in diagnostic method, PAM works in fundamental frequency switching frequency, its switching loss is less；PWM unit is to PAM
Harmonic component in unit output staircase waveform compensates, and significantly reduces voltage x current aberration rate, carries
The quality of high device output electric current；Using current direct control method, its control accuracy and response speed have
Large increase.
The disclosed above specific embodiment being only the present invention, this embodiment be only clearer explanation this
Bright used, and not limitation of the invention, the changes that any person skilled in the art can think of, all
Should fall in protection domain.
Claims (4)
1. the modulator approach of a SVG based on PAM+PWM cascaded multilevel inverter, it is characterised in that
The topological structure of described SVG include the first cascaded H-bridges, the second cascaded H-bridges, third level connection H bridge, the
Four cascaded H-bridges and level V connection H bridge, wherein, the first cascaded H-bridges, the second cascaded H-bridges, third level connection
H bridge, fourth stage connection H bridge constitutes PAM unit, and level V connection H bridge constitutes PWM with described PAM unit
Unit, wherein, described modulator approach comprises the following steps:
Step S1: carry out PAM regulation for PAM unit, optimizes PAM control algolithm by fundamental frequency,
The staircase waveform making described PAM unit export approaches sine wave；
Step S2: carry out PWM regulation for described PWM unit, controls technology by following-up type PWM
Output reactive current instantaneous value is carried out feedback control；
Described step S2 specifically includes:
Step S21: described PWM unit DC side desired voltage values is subtracted each other with actual voltage value, and passes through
PI regulation constitutes outer voltage；
Step S22: reference current and device are exported current subtraction, and constitutes in electric current after PI regulates
Ring；
Step S23: to the difference of system voltage and described PAM unit output voltage as PWM cells modulate
A part for ripple, to compensate the harmonic wave of described PAM unit output；
Step S24: the modulating wave of above-mentioned steps gained carries out standardization is i.e. straight divided by described PWM unit
Stream side voltage, with the impact suppressing the fluctuation of DC voltage to respond control；
Wherein, reference current is to be added and obtain by with reference to reactive current and reference watt current, with reference to meritorious
Electric current can be obtained by outer voltage output.
2. the modulation methods of SVG based on PAM+PWM cascaded multilevel inverter as claimed in claim 1
Method, it is characterised in that the fundamental frequency optimized algorithm in described step S1 farther includes:
Step S11: according to controlling target, definition optimal objective function:
Step S12: use interative computation method to solve described optimal objective function, draw each cascaded H-bridges
Switch angle；
Step S13: the switch angle of described each cascaded H-bridges drawn is used for leading of each H bridge switch device
Lead to and turn off.
3. the modulation methods of SVG based on PAM+PWM cascaded multilevel inverter as claimed in claim 2
Method, it is characterised in that described step S12 specifically includes:
(area equivalent principle is equal to enclosed sine by the rectangular area of staircase waveform one-level to use area equivalent principle
The area of ripple) obtain initial switch angle, initial value is substituted into and is iterated computing to solve optimal function permissible
Calculate the switch angle of each cascaded H-bridges described.
4. the tune of SVG based on PAM+PWM cascaded multilevel inverter as claimed in claim 1 or 2
Method processed, it is characterised in that described step S1 farther includes: to described PAM unit DC side
Use pulse rotation to control, make described PAM unit DC voltage equal on average, it is ensured that each H
The bridge DC side balance of voltage.
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| US9941813B2 (en) | 2013-03-14 | 2018-04-10 | Solaredge Technologies Ltd. | High frequency multi-level inverter |
| US9318974B2 (en) | 2014-03-26 | 2016-04-19 | Solaredge Technologies Ltd. | Multi-level inverter with flying capacitor topology |
| CN104682404A (en) * | 2015-03-02 | 2015-06-03 | 上海交通大学 | Cascade SVG based on PAM and PWM hybrid modulation |
| CN104682751B (en) * | 2015-03-02 | 2017-07-25 | 上海交通大学 | Modularization based on PAM and PWM hybrid modulations cascades multilevel converter |
| WO2019138550A1 (en) * | 2018-01-12 | 2019-07-18 | 三菱電機株式会社 | Power conversion device |
| CN110365241B (en) * | 2019-08-09 | 2020-06-05 | 重庆大学 | High-precision sine wave signal generation method |
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| CN1320297A (en) * | 1998-08-31 | 2001-10-31 | 株式会社日立制作所 | Controller for PWM/PAM motor and method for controlling air conditioner and motor having controller |
| CN102437801A (en) * | 2011-12-21 | 2012-05-02 | 海尔集团公司 | PWM (Pulse-Width Modulation), S-PAM (Spectrum-Pulse Amplitude Modulation) and PHASE linkage control motor driving method, device and system |
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