CN102842912A - Single carrier control method applicable to cascaded SVG - Google Patents

Single carrier control method applicable to cascaded SVG Download PDF

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CN102842912A
CN102842912A CN2012103360495A CN201210336049A CN102842912A CN 102842912 A CN102842912 A CN 102842912A CN 2012103360495 A CN2012103360495 A CN 2012103360495A CN 201210336049 A CN201210336049 A CN 201210336049A CN 102842912 A CN102842912 A CN 102842912A
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brachium pontis
state
voltage
cascade
switch motion
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CN102842912B (en
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罗安
熊桥坡
刘芸
寇磊
周发云
黎小聪
刘雷
马伏军
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Hunan University
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Abstract

The invention discloses a single carrier control method applicable to a cascaded SVG (Static Var Generator). The method comprises the following steps: acquiring the instantaneous values of power network voltage, grid-connected current, reactive instruction current and the direct current side voltage of each cascaded H bridge unit through a detection link and generating an SVG voltage modulating signal through voltage current double loop control; rounding off the voltage modulating signal, comparing the 'decimal part' acquired by rounding off with a single-channel triangular carrier signal to acquire one path of pulse signal P1, and adding the P1 and the 'integer part' acquired by rounding off to obtain one path of multilevel pulse signal; and distributing on-off action to a semiconductor power device according to the multilevel pulse signal, the current on-off state of a cascaded branch, the sequencing of direct current side voltage and the polarity of the grid-connected current so as to stabilize the direct current side voltage of each cascaded H bridge and control the grid-connected current. The harmonic characteristic of the method is more excellent than that of carrier phase-shift modulation; the on/off of power devices in the cascaded H bridges can be controlled by a single-channel triangular carrier; and the method is easy to implement.

Description

A kind of single carrier control method that is applicable to cascade connection type SVG
Technical field
The present invention relates to cascade connection type static reacance generator (SVG), particularly a kind of single carrier control method that is applicable to cascade connection type SVG.
Background technology
Cascade connection type SVG main circuit structure: with the single-phase full bridge inverter circuit is H bridge unit; Exchanging directly series connection of end by a plurality of H bridges unit; Draw current transformer from first H bridge unit with last H bridge unit and exchange end, three are linked adopts star-like connection, joins through connecting reactor and electrical network again.It has the following advantages: the power demand number of devices is few, does not need clamps; Realize modularization easily, be easy to expansion, be suitable for the different voltages with different grade.But the nonlinear load in the cascade connection type SVG centering high voltage distribution network carries out the dynamic passive compensation harmonic to be administered, and improves distribution network electric energy quality.
At present, the many level modulation method that is applicable to cascade connection type SVG mainly contains phase-shifting carrier wave modulation and the range upon range of modulation of carrier wave.The phase-shifting carrier wave modulation is compared with modulation signal by the triangular carrier of one group of phase shift, generates the multi-channel PWM ripple, is used for controlling the break-make of Cascade H bridge power device, can guarantee that each power device switch motion is balanced.One group of triangular carrier that amplitude is identical, frequency is identical is adopted in the range upon range of modulation of carrier wave; Pantostrat poststack and same modulating wave compare about transverse axis; According to the comparative result output different level of modulating wave with each triangular carrier, the break-make of decision corresponding power device.The range upon range of modulation of carrier wave is difficult to guarantee that each power device switch motion is balanced, but the range upon range of modulation of carrier wave homophase has good harmonic elimination performance.Be that phase-shifting carrier wave modulation or the range upon range of modulation of carrier wave all need multichannel triangular carrier signal and modulating wave relatively, realize that difficulty is big.
Summary of the invention
Technical problem to be solved by this invention is; Not enough to prior art; A kind of single carrier control method that is applicable to cascade connection type SVG is provided, reaches the purpose of stablizing each Cascade H bridge DC side voltage and control grid-connected current, realize the equilibrium of each power device switch motion.
For solving the problems of the technologies described above; The technical scheme that the present invention adopted is: a kind of single carrier control method that is applicable to cascade connection type SVG, and cascade connection type SVG comprises three cascade branch roads, each cascade branch road comprises the H bridge unit of several series connection; The Y-connection of said three cascade branch roads after reactor and insert three phase network and load between; Said H bridge unit is a single-phase full-bridge inverter, it is characterized in that the step of this method is following:
1) detect to obtain each Cascade H bridge unit dc voltage signal ( u Dai , u Dbi , u Dci ), the three phase network voltage signal ( u a , u b , u c ), idle instruction current ( i Qa , i Qb , i Qc ) and the grid-connected current signal ( i Ca , i Cb , i Cc ), through electric current and voltage dicyclo control generate the SVG voltage modulation signal ( u Ma , u Mb , u Mc );
2) to voltage modulation signal ( u Ma , u Mb , u Mc ) carry out single-carrier modulated, obtain many level pulses signal P 2
3) according to many level pulses signal P 2 , the cascade branch road current on off state Q, the ordering of single-phase full-bridge inverter dc voltage and the polarity of grid-connected current, switch motion is dispensed to the semiconductor power device of single-phase full-bridge inverter, reach the purpose of stablizing each Cascade H bridge unit dc voltage and control grid-connected current.
In the said step 1), the step of electric current and voltage dicyclo control is:
1) to the dc voltage summation of all H bridge unit in the cascade branch road, obtains DC side total voltage ∑ u Da , with the dc voltage set-point u d * Relatively, generated error e,, obtain the active current amplitude signal through digital PI link I Pa , multiply by again and this synchronous unit of cascade branch voltage sinusoidal signal, obtain the active current instantaneous value i Pa Wherein digital PI control formula is following:
Wherein, kBe sample sequence, I Pa (k)Be kThe active current amplitude signal of individual sampling instant pi regulator output, E (k)Be kIndividual sampling instant dc voltage error, K p Be the pi regulator proportionality coefficient, K i Be the pi regulator integral coefficient;
2) with the active current instantaneous value i Pa With idle instruction current i Qa Stack obtains instruction current i a Instruction current i a Compare with the grid-connected current of step 1) cascade branch road,, generate this cascade branch voltage modulation signal through dead beat control u Ma ,
Figure 2012103360495100002DEST_PATH_IMAGE004
Wherein, LBe the reactor reactance value, TBe control cycle, NBe Cascade H bridge element number.
Said step 2) in, the step of single-carrier modulated is following:
1) to the voltage modulation signal of the said cascade branch road of claim 2 u Ma Round operation, obtain " integer part " u Ma1 " fractional part " u Ma2 :
Figure 2012103360495100002DEST_PATH_IMAGE006
Figure 2012103360495100002DEST_PATH_IMAGE008
2) will round " fractional part " of gained u Ma2 With single channel triangular carrier signal U Carr Relatively, obtain 1 road pulse signal P 1a :
3) will P 1a With " integer part " that round gained u Ma1 Addition obtains 1 tunnel many level pulses signal P 2a :
Figure 2012103360495100002DEST_PATH_IMAGE012
。
The process that switch motion is dispensed to the semiconductor power device of single-phase full-bridge inverter is:
1) confirms the on off state of a cascade branch road Q: definition the iThe left brachium pontis on off state of individual H bridge unit does S 2i-1 , right brachium pontis on off state does S 2i If manage conducting on the brachium pontis, following pipe ends, and then the brachium pontis on off state is 1; End if manage on the brachium pontis, the conducting of following pipe, then the brachium pontis on off state is 0; Definition the iIndividual H bridge unit switch state H i Poor for the left and right brachium pontis on off state of this H bridge, that is:
Figure 2012103360495100002DEST_PATH_IMAGE014
Definition cascade branch switch state QBe each Cascade H bridge unit switch state sum, that is:
Figure 2012103360495100002DEST_PATH_IMAGE016
; Wherein N is a H bridge unit number;
2) many level pulse signals P 2a With cascade branch switch state Q, confirm the variation of cascade branch switch state △ Q:
Figure 2012103360495100002DEST_PATH_IMAGE018
；
3) switch motion is dispensed to the H bridge: if △ Q=1, cascade branch road Bing Wangdianliu>0, then that switch motion priority allocation to dc voltage is low H bridge unit; If △ Q=1, cascade branch road grid-connected current≤0, then that switch motion priority allocation to dc voltage is high H bridge unit; If △ Q=-1, cascade branch road Bing Wangdianliu>0, then that switch motion priority allocation to dc voltage is high H bridge unit; If △ Q=-1, cascade branch road grid-connected current≤0, then that switch motion priority allocation to dc voltage is low H bridge unit;
4) switch motion is dispensed to brachium pontis: be the action frequency of the left and right brachium pontis in the balance H bridge unit, introduce flag bit L i If L i =1, carry out switch and divide timing preferentially left brachium pontis to be judged; If L i =0, preferentially right brachium pontis is judged; If switch motion is dispensed to left brachium pontis the most at last, then put L i =0; If switch motion is dispensed to right brachium pontis the most at last, then put L i =1.
Compared with prior art; The beneficial effect that the present invention had is: the present invention is different with the range upon range of modulation of carrier wave with the phase-shifting carrier wave modulation; Only need the single channel triangular carrier just can realize break-make control, reach the purpose of stablizing each Cascade H bridge unit dc voltage and control grid-connected current power device in the Cascade H bridge unit; Has the good harmonic elimination performance of the range upon range of modulation of carrier wave homophase; And can realize the equilibrium of each power device switch motion.
Description of drawings
Fig. 1 is five level cascade connection type SVG main circuit structure figure;
Fig. 2 is the single carrier control block diagram that is applicable to cascade connection type SVG;
Fig. 3 is five level cascade connection type SVG single-carrier modulated sketch mapes; 3 (a) are for rounding the process sketch map; 3 (b) are the comparison procedure sketch map; 3 (c) are the additive process sketch map;
Fig. 4 is dispensed to the flow chart of H bridge unit for switch motion; Switch motion was dispensed to the flow chart of H bridge unit when 4 (a) were Δ Q=1; Switch motion was dispensed to the flow chart of H bridge unit when 4 (b) were Δ Q=-1;
Fig. 5 is dispensed to the flow chart of brachium pontis for switch motion; 5 (a) are Δ H iSwitch motion in=1 o'clock is dispensed to the flow chart of brachium pontis; 5 (b) are Δ H iSwitch motion in=-1 o'clock is dispensed to the flow chart of brachium pontis.
Embodiment
Fig. 1 is five level cascade connection type SVG main circuit structure figure, is H bridge unit with the single-phase full bridge inverter circuit, directly is composed in series at the interchange end by 2 H bridge unit.Three are linked adopts star-like connection, joins through connecting reactor and electrical network again.Wherein, the brachium pontis of two parallel connections and a dc bus capacitor branch road about the single-phase full bridge inverter circuit comprises, each brachium pontis is become by two power device series, and the dc bus capacitor branch road is parallelly connected with brachium pontis.Each Cascade H bridge input two-way is controlled the break-make of two brachium pontis power devices respectively, and is exported one road dc voltage signal from the pwm signal of control system.But the nonlinear load in the cascade connection type SVG centering high voltage distribution network carries out the dynamic passive compensation harmonic to be administered, and improves distribution network electric energy quality.
Fig. 2 is the single carrier control block diagram that is applicable to cascade connection type SVG.Each Cascade H bridge DC side voltage signal of detection acquisition ( u Dai , u Dbi , u Cdi ), mains voltage signal ( u a , u b , u c ), idle instruction current ( i Qa , i Qb , i Qc ) and the grid-connected current signal ( i Ca , i Cb , i Cc ).With A is example mutually, to each Cascade H bridge DC side voltage summation, obtains DC side total voltage ∑ u Da , with the dc voltage set-point u d * Relatively, generated error eThrough digital PI link, obtain the active current amplitude signal I Pa , multiply by sinusoidal signal again with the synchronous unit of A phase voltage, obtain the active current instantaneous value i Pa Numeral PI control formula is following:
(1)
Wherein, kBe sample sequence, I Pa (k)Be kThe active current amplitude signal of individual sampling instant pi regulator output, E (k)Be kIndividual sampling instant dc voltage error, K p Be the pi regulator proportionality coefficient, K i Be the pi regulator integral coefficient.
With the active current instantaneous value i Pa With idle instruction current i Qa Stack obtains instruction current i a Instruction current i a With the SVG grid-connected current i Ca Relatively, through dead beat control (DBC), generate A phase voltage modulation signal u Ma ,
Figure 485878DEST_PATH_IMAGE004
(2)
Wherein, L is for connecting reactance value, and T is a control cycle, and N is a Cascade H bridge number.
Voltage modulation signal u Ma Distribute link control main circuit power device break-make through single-carrier modulated and switch.The control procedure of B, C phase is mutually similar with A.
Fig. 3 five level cascade connection type SVG single-carrier modulated sketch mapes.Voltage modulation signal u Ma Through rounding, compare, superpose three processes, generate many level pulses signal P 2 With A is example mutually, and the single-carrier modulated process is following:
A) round.To voltage modulation signal u Ma Round operation, obtain " integer part " u Ma1 " fractional part " u Ma2 , shown in Fig. 3 (a).Wherein, u Ma1 For being not more than u Ma Maximum integer.
Figure 265615DEST_PATH_IMAGE006
(3)
Figure 660824DEST_PATH_IMAGE008
(4)
B) relatively.With " fractional part " that round gained u Ma2 With single channel triangular carrier signal U Carr Relatively, obtain pulse signal P 1a , shown in Fig. 3 (b).When The time, P 1aBe 1; When
Figure DEST_PATH_IMAGE022
The time, P 1a Be 0.
Figure 537513DEST_PATH_IMAGE010
(5)
C) stack.Will P 1a With " integer part " that round gained u Ma1 Addition obtains 1 tunnel many level pulses signal P 2a , shown in Fig. 3 (c).
Figure 359976DEST_PATH_IMAGE012
(6)
Fig. 4 is dispensed to the flow chart of H bridge for switch motion.
Before carrying out the switch distribution, need to confirm the current on off state of cascade branch road of SVG (is example with A mutually) QAnd state increment △ Q
Definition the iThe left brachium pontis on off state of individual H bridge does S 2i-1 , right brachium pontis on off state does S 2i If manage conducting on the brachium pontis, following pipe ends, and then the brachium pontis on off state is 1; End if manage on the brachium pontis, the conducting of following pipe, then the brachium pontis on off state is 0.
Definition the iIndividual H bridge switch state H i Poor for the left and right brachium pontis on off state of this H bridge.That is:
Figure 627009DEST_PATH_IMAGE014
(7)
Definition A phase on off state QBe each Cascade H bridge switch state sum, that is:
Figure DEST_PATH_IMAGE024
(8)
For realizing A phase on off state<i >Q</i>To many level pulses signal<i >P</i><sub ><i >2a</i></sub>Tracking, constantly relatively inverter switching states and many level pulses signal.If<i >P</i><sub ><i >2a</i></sub>><i >Q</i>, then need increase<i >Q</i>, state increment<i >Δ Q</i>=1; If<i >P</i><sub ><i >2a</i></sub><i ><Q</i>, then need reduce<i >Q</i>, state increment<i >Δ Q</i>=-1; If<i >P</i><sub ><i >2a</i></sub><i >=Q</i>, then all brachium pontis all are failure to actuate,<i >Q</i>Remain unchanged state increment<i >Δ Q</i>=0.
Figure 633099DEST_PATH_IMAGE018
(9)
When P 2a ≠ QThe time, satisfy often more than one of the brachium pontis of operation condition, to SVG dc voltage energy imbalance, the present invention adopts a kind of switch allocation strategy with reference to the dc voltage ordering.
For the 2N+1 electrical level inverter, N independently DC side arranged.Through detecting the instantaneous value that link obtains dc voltage, deposit array in u d [N].Adopt the bubbling method to array u d [N] carries out descending ordering, and the subscript after will sorting is recorded in array T[N].With 9 electrical level inverters is example; 4 independently DC sides are arranged, suppose that first Cascade H bridge DC side voltage is 740V, second Cascade H bridge DC side voltage is 735V; The 3rd Cascade H bridge DC side voltage is 760V, and the 4th Cascade H bridge DC side voltage is 720V.Before the ordering u d [N] is that { 740,735,760,720} is after the ordering u d [N] be 760,740,735,720}, array T[N] be 3,1,2,4}.
Work as Δ Q=1 o'clock, state of need selection was not 1 H bridge execution switch motion, increases its on off state.If grid-connected current i c >0, carry out the input power that this switch motion will improve this H bridge, be each H bridge DC side voltage of balance, preferentially this switch motion is dispensed to the low H bridge of dc voltage.With reference to dc voltage from low to high successively to H bridge state H T [N] , H T [N-1] , H T [1] Judging, is not 1 H bridge until the state of finding out, and makes its on off state increment Delta H i =1.If grid-connected current i c ≤0, carry out the input power that this switch motion will reduce this H bridge, be each H bridge DC side voltage of balance, preferentially this switch motion is dispensed to the high H bridge of dc voltage.Right successively from high to low with reference to dc voltage H T [1] , H T [2] , H T [N] Judging, is not 1 H bridge until the state of finding out, and makes its on off state increment Delta H i =1.Shown in Fig. 4 (a).
Work as Δ Q=-1 o'clock, state of need selection was not-1 H bridge execution switch motion, reduces its on off state.If grid-connected current i c >0, right successively H T [1] , H T [2] , H T [N] Judge, be not-1 H bridge, make its on off state increment Delta until finding out state H i =-1.If grid-connected current i c ≤0, right successively H T [N] , H T [N-1] , H T [1] Judge that the state of finding out is not-1 H bridge, makes its on off state increment Delta H i =-1.Shown in Fig. 4 (b).
Fig. 5 is dispensed to the flow chart of brachium pontis for switch motion.
Be the action frequency of the left and right brachium pontis in the balance H bridge, introduce flag bit L i If L i =1, switch divides timing preferentially left brachium pontis to be judged; If L i =0, preferentially right brachium pontis is judged.If switch motion is dispensed to left brachium pontis the most at last, then put L i =0, when switch motion is dispensed to this H bridge once more, preferentially right brachium pontis is judged.If switch motion is dispensed to right brachium pontis the most at last, then put L i =1, when switch motion is dispensed to this H bridge once more, preferentially left brachium pontis is judged.
When △ H i =1 o'clock, the switch assigning process was shown in Fig. 5 (a).If L i =1 and left brachium pontis state S 2i-1 =0, then left brachium pontis is carried out switch motion, and state turnover is 1, and will L i Put 0; If L i =1 and left brachium pontis state S 2i-1 =1, then right brachium pontis is carried out switch motion, and state turnover is 0, L i Remain unchanged; If L i =0 and right brachium pontis state S 2i =1, then right brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 1; If L i =0 and right brachium pontis state S 2i =0, then left brachium pontis is carried out switch motion, and state turnover is 1, L i Remain unchanged.
When △ H i =-1 o'clock, the switch assigning process was shown in Fig. 5 (b).If L i =1 and left brachium pontis state S 2i-1 =1, then left brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 0; If L i =1 and left brachium pontis state S 2i-1 =0, then right brachium pontis is carried out switch motion, and state turnover is 1, and L i Remain unchanged; If L i =0 and right brachium pontis state S 2i =0, then right brachium pontis is carried out switch motion, and state turnover is 1, and will L i Put 1; If L i =0 and right brachium pontis state S 2i =1, then left brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 0.

Claims (4)

1. single carrier control method that is applicable to cascade connection type SVG; Cascade connection type SVG comprises three cascade branch roads; Each cascade branch road comprises the H bridge unit of several series connection, the Y-connection of said three cascade branch roads after reactor and insert three phase network and load between, said H bridge unit is a single-phase full-bridge inverter; It is characterized in that the step of this method is following:
1) detect to obtain each Cascade H bridge unit dc voltage signal ( u Dai , u Dbi , u Dci ), the three phase network voltage signal ( u a , u b , u c ), idle instruction current ( i Qa , i Qb , i Qc ) and the grid-connected current signal ( i Ca , i Cb , i Cc ), through electric current and voltage dicyclo control generate the SVG voltage modulation signal ( u Ma , u Mb , u Mc );
2) to voltage modulation signal ( u Ma , u Mb , u Mc ) carry out single-carrier modulated, obtain many level pulses signal P 2
3) according to many level pulses signal P 2 , the cascade branch road current on off state Q, the ordering of single-phase full-bridge inverter dc voltage and the polarity of grid-connected current, switch motion is dispensed to the semiconductor power device of single-phase full-bridge inverter, reach the purpose of stablizing each Cascade H bridge unit dc voltage and control grid-connected current.
2. the single carrier control method that is applicable to cascade connection type SVG according to claim 1 is characterized in that, in the said step 1), the step of electric current and voltage dicyclo control is:
1) to the dc voltage summation of all H bridge unit in the cascade branch road, obtains DC side total voltage ∑ u Da , with the dc voltage set-point u d * Relatively, generated error e,, obtain the active current amplitude signal through digital PI link I Pa , multiply by again and this synchronous unit of cascade branch voltage sinusoidal signal, obtain the active current instantaneous value i Pa Wherein digital PI control formula is following:
Wherein, kBe sample sequence, I Pa (k)Be kThe active current amplitude signal of individual sampling instant pi regulator output, E (k)Be kIndividual sampling instant dc voltage error, K p Be the pi regulator proportionality coefficient, K i Be the pi regulator integral coefficient;
2) with the active current instantaneous value i Pa With idle instruction current i Qa Stack obtains instruction current i a Instruction current i a Compare with the grid-connected current of step 1) cascade branch road,, generate this cascade branch voltage modulation signal through dead beat control u Ma ,
Wherein, LBe the reactor reactance value, TBe control cycle, NBe Cascade H bridge element number.
3. the single carrier control method that is applicable to cascade connection type SVG according to claim 2 is characterized in that the step of said single-carrier modulated is following:
1) to the voltage modulation signal of the said cascade branch road of claim 2 u Ma Round operation, obtain " integer part " u Ma1 " fractional part " u Ma2 :
Figure 2012103360495100001DEST_PATH_IMAGE006
Figure 2012103360495100001DEST_PATH_IMAGE008
2) will round " fractional part " of gained u Ma2 With single channel triangular carrier signal U Carr Relatively, obtain 1 road pulse signal P 1a :
Figure 2012103360495100001DEST_PATH_IMAGE010
3) will P 1a With " integer part " that round gained u Ma1 Addition obtains 1 tunnel many level pulses signal P 2a :
。
4. the single carrier control method that is applicable to cascade connection type SVG according to claim 3 is characterized in that, the process that switch motion is dispensed to the semiconductor power device of single-phase full-bridge inverter is:
1) confirms the on off state of a cascade branch road Q: definition the iThe left brachium pontis on off state of individual H bridge unit does S 2i-1 , right brachium pontis on off state does S 2i If manage conducting on the brachium pontis, following pipe ends, and then the brachium pontis on off state is 1; End if manage on the brachium pontis, the conducting of following pipe, then the brachium pontis on off state is 0; Definition the iIndividual H bridge unit switch state H i Poor for the left and right brachium pontis on off state of this H bridge, that is:
Definition cascade branch switch state QBe each Cascade H bridge unit switch state sum, that is:
Figure 2012103360495100001DEST_PATH_IMAGE016
; Wherein N is a H bridge unit number;
2) many level pulse signals P 2a With cascade branch switch state Q, confirm the variation of cascade branch switch state △ Q:
Figure 2012103360495100001DEST_PATH_IMAGE018
；
3) switch motion is dispensed to the H bridge: if △ Q=1, cascade branch road Bing Wangdianliu>0, then that switch motion priority allocation to dc voltage is low H bridge unit; If △ Q=1, cascade branch road grid-connected current≤0, then that switch motion priority allocation to dc voltage is high H bridge unit; If △ Q=-1, cascade branch road Bing Wangdianliu>0, then that switch motion priority allocation to dc voltage is high H bridge unit; If △ Q=-1, cascade branch road grid-connected current≤0, then that switch motion priority allocation to dc voltage is low H bridge unit;
4) switch motion is dispensed to brachium pontis: be the action frequency of the left and right brachium pontis in the balance H bridge unit, introduce flag bit L i If L i =1, carry out switch and divide timing preferentially left brachium pontis to be judged; If L i =0, preferentially right brachium pontis is judged; If switch motion is dispensed to left brachium pontis the most at last, then put L i =0; If switch motion is dispensed to right brachium pontis the most at last, then put L i =1;
If L i =1 and left brachium pontis state S 2i-1 =0, then left brachium pontis is carried out switch motion, and state turnover is 1, and will L i Put 0; If L i =1 and left brachium pontis state S 2i-1 =1, then right brachium pontis is carried out switch motion, and state turnover is 0, L i Remain unchanged; If L i =0 and right brachium pontis state S 2i =1, then right brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 1; If L i =0 and right brachium pontis state S 2i =0, then left brachium pontis is carried out switch motion, and state turnover is 1, L i Remain unchanged;
If L i =1 and left brachium pontis state S 2i-1 =1, then left brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 0; If L i =1 and left brachium pontis state S 2i-1 =0, then right brachium pontis is carried out switch motion, and state turnover is 1, L i Remain unchanged; If L i =0 and right brachium pontis state S 2i =0, then right brachium pontis is carried out switch motion, and state turnover is 1, and will L i Put 1; If L i =0 and right brachium pontis state S 2i =1, then left brachium pontis is carried out switch motion, and state turnover is 0, and will L i Put 0.
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CN103606936A (en) * 2013-12-03 2014-02-26 哈尔滨工业大学 H-bridge cascading STATCOM dead-beat control method based on discrete state observer and discrete sliding-mode observer
CN103956737A (en) * 2014-04-22 2014-07-30 上海交通大学 Carrier level cascade-modulating method capable of filtering out higher harmonic waves in cascaded H-bridge topology
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CN107591823A (en) * 2017-10-27 2018-01-16 长沙拓扑陆川新材料科技有限公司 A kind of angle-style chain type SVG and its compensating control method
CN111464061A (en) * 2020-03-26 2020-07-28 长沙理工大学 Single carrier modulation loss modeling method for modular medium-voltage high-power inverter power supply
CN112311005A (en) * 2020-09-29 2021-02-02 广西大学 Device and control method of single-phase multi-level cascade H-bridge converter
CN113691156A (en) * 2021-08-30 2021-11-23 燕山大学 Modulation strategy of multi-level converter

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Publication number Priority date Publication date Assignee Title
CN103606936A (en) * 2013-12-03 2014-02-26 哈尔滨工业大学 H-bridge cascading STATCOM dead-beat control method based on discrete state observer and discrete sliding-mode observer
CN103606936B (en) * 2013-12-03 2015-08-19 哈尔滨工业大学 Based on the H bridge cascade STATCOM dead-beat control method of discrete state observer and sliding mode observer
CN103956737A (en) * 2014-04-22 2014-07-30 上海交通大学 Carrier level cascade-modulating method capable of filtering out higher harmonic waves in cascaded H-bridge topology
CN103956737B (en) * 2014-04-22 2016-11-23 上海交通大学 Cascaded H-bridges topology can filter the carrier level stacking modulator approach of higher hamonic wave
CN104901381A (en) * 2015-06-16 2015-09-09 北京亿利智慧能源科技有限公司 Equalizing current control method for H-bridge cascaded energy-storing system
CN104901381B (en) * 2015-06-16 2018-03-30 北京亿利智慧能源科技有限公司 The euqalizing current control method of H bridge cascade energy storage systems
CN107591823A (en) * 2017-10-27 2018-01-16 长沙拓扑陆川新材料科技有限公司 A kind of angle-style chain type SVG and its compensating control method
CN111464061A (en) * 2020-03-26 2020-07-28 长沙理工大学 Single carrier modulation loss modeling method for modular medium-voltage high-power inverter power supply
CN111464061B (en) * 2020-03-26 2023-01-03 长沙理工大学 Single carrier modulation loss modeling method for modular medium-voltage high-power inverter power supply
CN112311005A (en) * 2020-09-29 2021-02-02 广西大学 Device and control method of single-phase multi-level cascade H-bridge converter
CN113691156A (en) * 2021-08-30 2021-11-23 燕山大学 Modulation strategy of multi-level converter
CN113691156B (en) * 2021-08-30 2022-03-29 燕山大学 Modulation strategy of multi-level converter

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