CN107681913A - A kind of ANPC types three-level inverter modulator approach - Google Patents

A kind of ANPC types three-level inverter modulator approach Download PDF

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Publication number
CN107681913A
CN107681913A CN201710912010.6A CN201710912010A CN107681913A CN 107681913 A CN107681913 A CN 107681913A CN 201710912010 A CN201710912010 A CN 201710912010A CN 107681913 A CN107681913 A CN 107681913A
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China
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moment
pipe
change
open
output voltage
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周洪伟
张磊
邓洋
张辉
支娜
李宁
王帆
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TBEA Xinjiang Sunoasis Co Ltd
TBEA Xian Electric Technology Co Ltd
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TBEA Xinjiang Sunoasis Co Ltd
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    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters

Abstract

The invention discloses a kind of ANPC types three-level inverter modulator approach, belong to electric and electronic technical field；Comprise the following steps：1. in modulation voltage UoPositive half cycle, output voltage is by+UdcDuring/2 to 0 change, altogether by t1、t2Two on off states change the moment；t1Moment turns off T2Pipe, t2Moment opens T3Pipe；Output voltage is by 0 to+UdcDuring/2 change, altogether by t3、t4Two on off states change moment, t3Moment turns off T3Pipe, t4Moment opens T2Pipe；In modulation voltage UoNegative half period, modulator approach is correspondingly；2. modulation voltage UoBy just half week to during negative half period transition, altogether by t5、t6、t7、t8Four on off states change the moment；Take modulation voltage UoZero crossing by just half week to negative half period is t5At the moment, turn off T1Pipe；t6At the moment, open T2、T5Pipe；t7At the moment, turn off T3、T6Pipe；t8At the moment, open T4Pipe；Modulation voltage UoBy negative half period to during positive half cycle transition, modulator approach is correspondingly；Bus capacitor short circuit problem when method provided by the invention can overcome the change of current, and avoid in modulating wave UoThere is long commutation circuit near zero-crossing point, has certain engineering practical value.

Description

A kind of ANPC types three-level inverter modulator approach
Technical field
The invention belongs to electric and electronic technical field, more particularly to a kind of ANPC types three-level inverter modulator approach.
Background technology
ANPC (Active Neutral-point-clamped, active neutral point clamp) type three-level inverter is a kind of weight The Power Electronic Circuit wanted, its main circuit topology are as shown in Figure 1.The topology includes 2 dc-link capacitance C1、C2, 6 switches Pipe T1~T6, 6 diode D1~D6.Wherein, C1、C2DC+~0 is connected to respectively, between 0~DC-；D1~D6Respectively inverse parallel in T1~T6；T5、T6、D5、D6For clamper tube.It is+U to define ANPC type three-level inverter output voltagesdcWhen/2, it works in P shapes State, now current path is T1、T2Or D2、D1；Output voltage is 0, and current path is T6、D3Or T3、D6When, it works in O- State；Output voltage is 0, and current path is T5、D2Or T2、D5When, it works in O+State；Output voltage is-UdcWhen/2, It works in N-state, and now current path is T3、T4Or D4、D3；Traditional ANPC types three-level inverter has two kinds of modulation Method：
1.T1、T5Complementation, T4、T6Complementation, and high frequency mode is operated in, T2、T3It is complementary and be operated in power frequency pattern.Work as tune Ripple U processedo>=0, T1、T5Complementation conducting, T2It is held on, T3、T4、T6It is held off；As modulating wave Uo<When 0, T4、T6Complementation is led It is logical, T3It is held on, T1、T2、T5It is held off；
2.T1、T5Complementation, T4、T6Complementation, and it is operated in power frequency pattern, T2、T3It is complementary and be operated in high frequency mode.Work as tune Ripple U processedoWhen >=0, T2、T3Complementation conducting, T1、T6It is held on, T4、T5It is held off；As modulating wave Uo<When 0, T2、T3Complementation is led It is logical, T4、T5It is held on, T1、T6It is held off；
The modulation strategy of ANPC type three-level inverters is generally using above two method as primary modulation method, still Bus capacitor short circuit problem when in actual applications, due to the pressure-resistant limitation of switching device and the change of current, need to consider that each switching tube is led The logical sequential with shut-off, inverter modulation strategy is turned on by each switching tube to be influenceed with shut-off sequential.In addition, also taken an examination during the change of current Consider change of current path：In modulating wave UoThere is long commutation circuit and is not only the possibility to change accounting for for inverter working condition near zero-crossing point Empty ratio, cause inverter output waveforms harmonic wave to increase, and add the peak voltage that switching device is subjected to, if the spike Voltage exceedes switching device pressure voltage, can damage switching tube.Therefore, bus capacitor short circuit problem when overcoming the change of current, and avoid In modulating wave UoThere is an important factor for long commutation circuit is to ensure that ANPC type inverter reliably workings near zero-crossing point.
At present, domestic and foreign scholars propose many ANPC types three-level inverter commutation modes, as used in existing engineering The improvement strategy for above-mentioned 1st kind of modulation strategy, still, do not have yet scholar for above-mentioned 2nd kind of modulation strategy propose compared with Perfect commutation mode.
The content of the invention
The present invention is directed to above-mentioned 2nd kind of modulation system, and main purpose is bus capacitor short circuit problem when overcoming the change of current, and is kept away Exempt from modulating wave UoThere is long commutation circuit near zero-crossing point, there is provided a kind of ANPC types three-level inverter modulator approach, the party Method has the advantages of being easily achieved, reliability is high.
In order to achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of ANPC types three-level inverter modulator approach, comprises the following steps：
Step 1, in modulation voltage UoPositive half cycle, output voltage is by+UdcDuring/2 to 0 change, altogether by t1、t2Two switches State change moment, t1Moment is output voltage by+UdcAt/2 to 0 change moment, now turn off T2Pipe, treats T2Pipe complete switches off After take the moment to be t2At the moment, open T3Pipe；Output voltage is by 0 to+UdcDuring/2 change, altogether by t3、t4Two on off states become Change moment, t3Moment is output voltage by 0 to+UdcAt/2 change moment, now turn off T3Pipe, treats T3Pipe takes this after complete switching off Moment is t4At the moment, open T2Pipe；
Step 2, modulation voltage UoTo negative half period transient process it is commutation course by just half week, commutation course passes through t altogether5、 t6、t7、t8Four on off states change the moment；In modulation voltage UoBy the zero crossing in just half week to negative half period, the zero crossing is taken to be t5At the moment, turn off T1Pipe；Treat T1Pipe takes the moment after complete switching off be t6At the moment, open T2、T5Pipe；Treat T2、T5After pipe is opened completely It is t to take the moment7At the moment, turn off T3、T6Pipe；Treat T3、T6Pipe takes the moment after complete switching off be t8At the moment, open T4Pipe；
Step 3, in modulation voltage UoNegative half period, output voltage is by 0 to-UdcDuring/2 change, altogether by t9、t10Two switches State change moment, t9Moment is output voltage by 0 to-UdcAt/2 change moment, now turn off T2Pipe, treats T2Pipe complete switches off After take the moment to be t10At the moment, open T3Pipe；Output voltage is by-UdcDuring/2 to 0 change, altogether by t11、t12Two on off states Change the moment.t11Moment is output voltage by-UdcAt/2 to 0 change moment, now turn off T3Pipe, treats T3Pipe takes after complete switching off The moment is t12At the moment, open T2Pipe；
Step 4, modulation voltage UoIt is commutation course by negative half period to positive half cycle transient process, commutation course passes through altogether t13、t14、t15、t16Four on off states change the moment.In modulation voltage UoZero crossing by negative half period to positive half cycle, takes the mistake Zero point is t13At the moment, turn off T4Pipe；Treat T4Pipe takes the moment after complete switching off be t14At the moment, open T3、T6Pipe；Treat T3、T6Manage It is t that the moment is taken after standard-sized sheet is logical15At the moment, turn off T2、T5Pipe；Treat T2、T5Pipe takes the moment after complete switching off be t16It is moment, open-minded T1Pipe.
t1~t2、t3~t4For dead time, time interval is chosen and should ensure that T2Or T3Complete switch off；t5~t6、t7~t8For Dead time, time interval are chosen and should ensure that T1Or T3And T6Complete switch off；t6~t7For dead time, time interval is chosen and should protected Demonstrate,prove T2And T5It is completely open-minded；t9~t10、t11~t12For dead time, time interval is chosen and should ensure that T3Or T2Complete switch off；t13 ~t14、t15~t17For dead time, time interval is chosen and should ensure that T4Or T2And T5Complete switch off, t14~t15For dead time, Time interval is chosen and should ensure that T3And T6It is completely open-minded.
Described ANPC type three-level inverter modulator approaches, suitable for ANPC type three-level inverter capacitive loads and sense Property load.
The beneficial effects of the invention are as follows：1) upper and lower bridge arm can be avoided to lead directly to during the change of current, bus capacitor will not be caused short-circuit；2) It can avoid in modulating wave UoThere is long commutation circuit near zero-crossing point, and will not change the dutycycle of each working condition of inverter.
Brief description of the drawings
Fig. 1 is ANPC type three-level inverter main circuit topology figures.
Fig. 2 is the modulation strategy schematic diagram of the inventive method：Modulation involve carrier waveform figure, each switching tube timing diagram with And corresponding output voltage, current waveform figure.
Fig. 3 is modulation voltage UoPositive half cycle, output voltage is by+UdcThe change of current path profile of/2 to 0 change, wherein, Fig. 3 (a) Current path figure during P-state is worked in for ANPC type three-level inverters, Fig. 3 (b) is to open T in P-state3Electric current afterwards Path profile, Fig. 3 (c) are to turn off T in P-state2Current path figure afterwards.
Fig. 4 is modulation voltage UoPositive half cycle, output voltage is by 0 to+UdcThe change of current path profile of/2 changes, wherein, Fig. 4 (a) O is worked in for ANPC type three-level inverters-Current path figure during state, Fig. 4 (b) are in O-T is opened during state2Electricity afterwards Flow path figure, Fig. 4 (c) are in O-T is turned off during state3Current path figure afterwards.
Fig. 5 is modulation voltage UoIt is inverse using the level of ANPC types three provided by the invention by just half week to during negative half period transition Become device modulation strategy and inverter load is in perception, inverter working condition is by O-Change to O+Change of current path profile, wherein, Fig. 5 (a) O is worked in for ANPC type three-level inverters-Current path figure during state, Fig. 5 (b) are in O-T is turned off during state1Afterwards Current path figure, Fig. 5 (c) are that T is opened in the case of Fig. 5 (b)2、T5Current path figure afterwards, Fig. 5 (d) are Fig. 5's (c) In the case of turn off T3、T6Current path figure afterwards, Fig. 5 (e) are that T is opened in the case of Fig. 5 (d)4Current path figure afterwards.
Fig. 6 is modulation voltage UoBy just half week to during negative half period transition, using the 2nd kind of tradition of ANPC types three-level inverter Modulation strategy, inverter working condition is by O-Change to O+Change of current path profile wherein, Fig. 6 (a) is ANPC type three-level inverters Work in O-Current path figure during state, Fig. 6 (b) are in O-T is turned off during state1、T3、T6Current path figure afterwards, Fig. 6 (c) To open T in the case of Fig. 6 (b)2、T4、T5Current path figure afterwards.
Fig. 7 is modulation voltage UoIt is inverse using the level of ANPC types three provided by the invention by just half week to during negative half period transition It is in capacitive to become device modulation strategy and inverter load, and inverter working condition is by O-Change to O+Change of current path profile, wherein, Fig. 7 (a) O is worked in for ANPC type three-level inverters-Current path figure during state, Fig. 7 (b) are in O-T is turned off during state1Afterwards Current path figure, Fig. 7 (c) are that T is opened in the case of Fig. 7 (b)2、T5Current path figure afterwards, Fig. 7 (d) are Fig. 7's (c) In the case of turn off T3、T6Current path figure afterwards, Fig. 7 (e) are that T is opened in the case of Fig. 7 (d)4Current path figure afterwards.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
The invention discloses a kind of ANPC types three-level inverter modulator approach, when overcoming the change of current bus capacitor short circuit ask Topic, and avoid in modulating wave UoThere is long commutation circuit near zero-crossing point, referring to Fig. 2, implements according to following steps：
Step 1, in modulation voltage UoPositive half cycle, output voltage is by+UdcDuring/2 to 0 change, altogether by t1、t2Two switches State change moment, t1Moment is output voltage by+UdcAt/2 to 0 change moment, now turn off T2Pipe, treats T2Pipe complete switches off After take the moment to be t2At the moment, open T3Pipe；Output voltage is by 0 to+UdcDuring/2 change, altogether by t3、t4Two on off states become Change moment, t3Moment is output voltage by 0 to+UdcAt/2 change moment, now turn off T3Pipe, treats T3Pipe takes this after complete switching off Moment is t4At the moment, open T2Pipe；Wherein, t1~t2、t3~t4Time interval is chosen and should ensure that T2Or T3Complete switch off；
Step 2, modulation voltage UoTo negative half period transient process it is commutation course by just half week, commutation course passes through t altogether5、 t6、t7、t8Four on off states change the moment；In modulation voltage UoBy the zero crossing in just half week to negative half period, the zero crossing is taken to be t5At the moment, turn off T1Pipe；Treat T1Pipe takes the moment after complete switching off be t6At the moment, open T2、T5Pipe；Treat T2、T5After pipe is opened completely It is t to take the moment7At the moment, turn off T3、T6Pipe；Treat T3、T6Pipe takes the moment after complete switching off be t8At the moment, open T4Pipe；Wherein, t5~t6、t7~t8Time interval is chosen and should ensure that T1Or T3、T6Complete switch off, t6~t7Time interval is chosen and should ensure that T2、T5It is complete Standard-sized sheet leads to；
Step 3, in modulation voltage UoNegative half period, output voltage is by 0 to-UdcDuring/2 change, altogether by t9、t10Two switches State change moment, t9Moment is output voltage by 0 to-UdcAt/2 change moment, now turn off T2Pipe, treats T2Pipe complete switches off After take the moment to be t10At the moment, open T3Pipe；Output voltage is by-UdcDuring/2 to 0 change, altogether by t11、t12Two on off states Change the moment.t11Moment is output voltage by-UdcAt/2 to 0 change moment, now turn off T3Pipe, treats T3Pipe takes after complete switching off The moment is t12At the moment, open T2Pipe；Wherein, t9~t10、t11~t12Time interval is chosen and should ensure that T3Or T2Complete switch off；
Step 4, modulation voltage UoIt is commutation course by negative half period to positive half cycle transient process, commutation course passes through altogether t13、t14、t15、t16Four on off states change the moment.In modulation voltage UoZero crossing by negative half period to positive half cycle, takes the mistake Zero point is t13At the moment, turn off T4Pipe；Treat T4Pipe takes the moment after complete switching off be t14At the moment, open T3、T6Pipe；Treat T3、T6Manage It is t that the moment is taken after standard-sized sheet is logical15At the moment, turn off T2、T5Pipe；Treat T2、T5Pipe takes the moment after complete switching off be t16It is moment, open-minded T1Pipe；Wherein, t13~t14、t15~t17Time interval is chosen and should ensure that T4Or T2、T5Complete switch off, t14~t15Time interval is selected Take and should ensure that T3、T6It is completely open-minded.
The present invention is to improve to obtain on the basis of above-mentioned 2nd kind traditional ANPC types three-level inverter modulator approach, hereafter The technical scheme is described in detail with specific embodiment, and illustrates its operation principle.
Embodiment：
When the load of ANPC types three-level inverter is in perception, output current Io>0, modulation voltage UoBy just half week to negative half period Modulator approach be：
Step 1) is in modulation voltage UoPositive half cycle, output voltage is by+Udc/ 2 to 0 change eve, inverter are operated in P shapes State, now T1、T2、T6Pipe turns on, T3、T4、T5Pipe turns off, IoFlow through T1、T2Output, shown in such as Fig. 3 (a) of path；
Step 2) is in modulation voltage UoPositive half cycle, output voltage is by+UdcDuring/2 to 0 change, inverter working condition is by P shapes State, which becomes, turns to O-State, now on off state should be by T1、T2、T6Pipe turns on, T3、T4、T5Pipe shut-off change turns to T1、T3、T6Pipe is led It is logical, T2、T4、T5Pipe turns off.But if shut-off T2T is opened while pipe3Pipe opens T first3Pipe is then powered off T2Pipe, can Cause electric capacity C1Short circuit, as shown in Fig. 3 (b).So the switch device conductive taken is with shut-off sequential：t1Moment turns off T2Pipe, t2Moment opens T3Pipe, as shown in Fig. 3 (c).Wherein, t1~t2For dead time, time interval is chosen and should ensure that T2Pipe closes completely It is disconnected；
Step 3) is in modulation voltage UoPositive half cycle, output voltage is by 0 to+Udc/ 2 change eves, inverter are operated in O- State, now T1、T3、T6Pipe turns on, T2、T4、T5Pipe turns off, IoFlow through T6、D3Output, shown in such as Fig. 4 (a) of path；
Step 4) is in modulation voltage UoPositive half cycle, output voltage is by 0 to+UdcDuring/2 change, inverter working condition is by O- State change is P-state, and now on off state should be by T1、T3、T6Pipe turns on, T2、T4、T5Pipe shut-off change turns to T1、T2、T6Pipe is led It is logical, T3、T4、T5Pipe turns off.But if shut-off T3T is opened while pipe2Pipe opens T first2Pipe is then powered off T3Pipe, can Cause electric capacity C1Short circuit, as shown in Fig. 4 (b).So the switch device conductive taken is with shut-off sequential：t3Moment turns off T3Pipe, t4Moment opens T2Pipe, as shown in Fig. 4 (c).Wherein, t3~t4For dead time, time interval is chosen and should ensure that T3Pipe closes completely It is disconnected；
Step 5) is in modulation voltage UoPositive half cycle zero crossing eve, inverter are operated in O-State, it is identical with step 3), As shown in Fig. 5 (a)；
Step 6) is in modulation voltage UoDuring by just half circumferential negative half period transition, inverter working condition is by O-State change is O+State, now on off state should be by T1、T3、T6Pipe turns on, T2、T4、T5Pipe shut-off change turns to T2、T4、T5Pipe turns on, T1、T3、T6 Pipe turns off.Take modulation voltage UoZero crossing is t5At the moment, turn off T1Pipe.Now, IoPath is constant, flows through T6、D3Output, inverter Still it is operated in O-State, as shown in Fig. 5 (b)；t6At the moment, open T2、T5Pipe.Now, IoShunting has two paths, flows through T6、D3 And D5、T2Output, inverter are operated in O-State and O+State, as shown in Fig. 5 (c)；t7At the moment, turn off T3、T6Pipe.Now, IoRoad Footpath changes, and flows through D5、T2Output, inverter working condition is by O-State change is O+State, as shown in Fig. 5 (d)；t8At the moment, open Logical T4Pipe.Now, IoPath is constant, flows through D5、T2Output, inverter are still operated in O+State, as shown in Fig. 5 (e).It can be seen that adjust Voltage U processedoPass through t altogether to negative half period transient process by just half week5、t6、t7、t8Four on off states change the moment.Wherein, t5~ t6、t7~t8For dead time, time interval is chosen and should ensure that T1Or T3、T6Complete switch off, t6~t7For dead time, between the time T is should ensure that every selection2、T5It is completely open-minded.
In modulation voltage UoDuring by just half circumferential negative half period transition, inverter working condition should be by O-State change is O+Shape State, according to the 2nd kind of conventional modulated method of ANPC types three-level inverter, to avoid upper and lower bridge arm is straight-through from causing bus capacitor short Road, in modulation voltage UoZero crossing, i.e. t5At the moment, turn off T1、T3、T6Pipe, leaves certain dead time, now inverter work shape State should be by O-State change is N-state, as shown in Fig. 6 (b), long commutation circuit occurs.Then T is opened2、T4、T5Pipe, Fang Keshi Now by O-State is to O+The transformation of state, as shown in Fig. 6 (c).It can be seen that though when this method can overcome the change of current bus capacitor short circuit ask Topic, it can be difficult to avoiding modulating wave UoThere is long commutation circuit near zero-crossing point, and N shapes are added in working condition change procedure State, change each working condition dutycycle of inverter；The above-mentioned improvement modulation strategy for being directed to the 2nd kind of conventional modulated strategy, is being modulated Voltage UoZero crossing, i.e. t5At the moment, turn off T1Pipe, does not change inverter working condition, and avoid and then open T2、T5It is female during pipe Line capacitance C1Short circuit.Then T is opened2、T5Pipe, makes inverter while is operated in O-、O+State, shut-off T after avoiding3、T6Pipe When inverter be operated in N-state.T is turned off afterwards3、T6Pipe, inverter are operated in O+State, now, inverter work is completed State is by O-State is to O+The transformation of state, and avoid in modulating wave UoThere is long commutation circuit near zero-crossing point.Finally, open Logical T4Pipe, O-State is to O+State transformation is completed.It can be drawn by contrast, the ANPC type tri-level inversions that the present embodiment provides Device modulation strategy is in modulation voltage UoDuring by just half circumferential negative half period transition, by O-Addition O before state does not terminate+State, make Inverter working condition can be by O-State, which directly becomes, turns to O+State, be not in N-state.Modulation voltage UoFrom negative half period to just Half cycle transition can be realized similarly.The strategy while bus capacitor short circuit problem, avoids modulating wave U when overcoming the change of currentoCross There is long commutation circuit in zero crossings, and do not change each working condition dutycycle of inverter.
When the load of ANPC types three-level inverter is in perceptual, in modulation voltage UoNegative half period, modulator approach and modulation electricity Press UoPositive half cycle is corresponding；In modulation voltage UoFrom negative half period to during positive half cycle transition, modulator approach and modulation voltage UoBy just half It is corresponding during circumferential negative half period transition.When the load of ANPC types three-level inverter is in capacitive, in modulation voltage UoPositive half cycle or Negative half period, modulator approach and above-mentioned load in it is perceptual when method it is identical.It is following to will be explained under capacitive load, modulation voltage Uo By just half week to the transient process of negative half period.
When the load of ANPC types three-level inverter is in capacitive, output current Io<0, modulation voltage UoBy just half week to negative half period Transient process is：
Step 1) is in modulation voltage UoPositive half cycle zero crossing eve, inverter are operated in O-State, now T1、T3、T6Pipe Conducting, T2、T4、T5Pipe turns off, IoFlow through T3、D6Output, shown in such as Fig. 7 (a) of path；
Step 2) is in modulation voltage UoDuring by just half circumferential negative half period transition, inverter working condition is by O-State change is O+State, now on off state should be by T1、T3、T6Pipe turns on, T2、T4、T5Pipe shut-off change turns to T2、T4、T5Pipe turns on, T1、T3、T6 Pipe turns off.Take modulation voltage UoZero crossing is t5At the moment, turn off T1Pipe.Now, IoPath is constant, flows through T3、D6, inverter still work Make in O-State, as shown in Fig. 7 (b)；t6At the moment, open T2、T5Pipe.Now, IoShunting has two paths, flows through T3、D6And D2、 T5, inverter is operated in O-State and O+State, as shown in Fig. 7 (c)；t7At the moment, turn off T3、T6Pipe.Now, IoPath change, Flow through D2、T5, inverter working condition is by O-State change is O+State, as shown in Fig. 7 (d)；t8At the moment, open T4Pipe.Now, IoPath is constant, flows through D2、T5Output, inverter are still operated in O+State, as shown in Fig. 7 (e).It can be seen that modulation voltage UoBy just Half week passed through t altogether to negative half period transient process5、t6、t7、t8Four on off states change the moment.Wherein, t5~t6、t7~t8To be dead Area's time, time interval are chosen and should ensure that T1Or T3、T6Complete switch off, t6~t7For dead time, time interval is chosen and should ensure that T2、T5It is completely open-minded.
In summary, for the 2nd kind of conventional modulated strategy of ANPC types three-level inverter, if adding dead time, though can Bus capacitor short circuit problem when overcoming the change of current, it can be difficult to avoiding in modulating wave UoThere is long commutation circuit near zero-crossing point, no But the dutycycle of each working condition of inverter can be changed, and increase the due to voltage spikes born required for switching device.In order to solve The problem, the invention provides a kind of improvement modulation strategy for being directed to the 2nd kind of conventional modulated strategy, led by changing switching device Logical, shut-off sequential, when overcoming the change of current while bus capacitor short circuit problem, avoids modulating wave UoNear zero-crossing point is grown Commutation circuit：In modulation voltage UoZero crossing turns off T1Pipe, does not change inverter working condition；Then T is opened2、T5Pipe, makes inverse Become device and be operated in O simultaneously-、O+State；T is turned off afterwards3、T6Pipe, inverter are operated in O+State, now, inverter is completed Working condition is by O-State is to O+The transformation of state, and avoid in modulating wave UoThere is long commutation circuit near zero-crossing point.Most Afterwards, T is opened4Pipe, O-State is to O+State transformation is completed.Modulation voltage UoCan similarly it be realized from negative half period to positive half cycle transition.Can See, the invention provides a kind of ANPC types three-level inverter is effective, reliable change of current method, very with Practical valency Value.

Claims (3)

  1. A kind of 1. ANPC types three-level inverter modulator approach, it is characterised in that：Comprise the following steps：
    Step 1, in modulation voltage UoPositive half cycle, output voltage is by+UdcDuring/2 to 0 change, altogether by t1、t2Two on off states Change moment, t1Moment is output voltage by+UdcAt/2 to 0 change moment, now turn off T2Pipe, treats T2Pipe takes after complete switching off The moment is t2At the moment, open T3Pipe；Output voltage is by 0 to+UdcDuring/2 change, altogether by t3、t4During two on off state changes Carve, t3Moment is output voltage by 0 to+UdcAt/2 change moment, now turn off T3Pipe, treats T3Pipe takes the moment after complete switching off For t4At the moment, open T2Pipe；
    Step 2, modulation voltage UoTo negative half period transient process it is commutation course by just half week, commutation course passes through t altogether5、t6、 t7、t8Four on off states change the moment；In modulation voltage UoBy just half week, to the zero crossing of negative half period, it is t to take the zero crossing5 At the moment, turn off T1Pipe；Treat T1Pipe takes the moment after complete switching off be t6At the moment, open T2、T5Pipe；Treat T2、T5After pipe is opened completely It is t to take the moment7At the moment, turn off T3、T6Pipe；Treat T3、T6Pipe takes the moment after complete switching off be t8At the moment, open T4Pipe；
    Step 3, in modulation voltage UoNegative half period, output voltage is by 0 to-UdcDuring/2 change, altogether by t9、t10Two on off states Change moment, t9Moment is output voltage by 0 to-UdcAt/2 change moment, now turn off T2Pipe, treats T2Pipe takes after complete switching off The moment is t10At the moment, open T3Pipe；Output voltage is by-UdcDuring/2 to 0 change, altogether by t11、t12Two on off state changes Moment.t11Moment is output voltage by-UdcAt/2 to 0 change moment, now turn off T3Pipe, treats T3When pipe takes this after complete switching off Carve as t12At the moment, open T2Pipe；
    Step 4, modulation voltage UoIt is commutation course by negative half period to positive half cycle transient process, commutation course passes through t altogether13、t14、 t15、t16Four on off states change the moment.In modulation voltage UoZero crossing by negative half period to positive half cycle, takes the zero crossing to be t13At the moment, turn off T4Pipe；Treat T4Pipe takes the moment after complete switching off be t14At the moment, open T3、T6Pipe；Treat T3、T6Pipe is completely open-minded After take the moment to be t15At the moment, turn off T2、T5Pipe；Treat T2、T5Pipe takes the moment after complete switching off be t16At the moment, open T1Pipe.
  2. 2. ANPC types three-level inverter modulator approach according to claim 1, its feature are：t1~t2、t3~t4For Dead time, time interval are chosen and should ensure that T2Or T3Complete switch off；t5~t6、t7~t8For dead time, time interval is chosen It should ensure that T1Or T3And T6Complete switch off；t6~t7For dead time, time interval is chosen and should ensure that T2And T5It is completely open-minded；t9~ t10、t11~t12For dead time, time interval is chosen and should ensure that T3Or T2Complete switch off；t13~t14、t15~t17For dead band when Between, time interval is chosen and should ensure that T4Or T2And T5Complete switch off, t14~t15For dead time, time interval is chosen and should ensure that T3 And T6It is completely open-minded.
  3. 3. ANPC types three-level inverter modulator approach according to claim 1, its feature are：Suitable for ANPC types three Electrical level inverter capacitive load and inductive load.
CN201710912010.6A 2017-09-29 2017-09-29 A kind of ANPC types three-level inverter modulator approach Pending CN107681913A (en)

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CN108471247A (en) * 2018-03-30 2018-08-31 华为技术有限公司 Control method, the device and system of three-level inverter
CN108880311A (en) * 2018-07-05 2018-11-23 华为技术有限公司 A kind of clamp modulator approach, device and the inverter of multi-electrical level inverter
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CN112688274A (en) * 2020-12-08 2021-04-20 特变电工西安电气科技有限公司 Fault wave sealing method for photovoltaic grid-connected inverter
CN112688584A (en) * 2020-12-15 2021-04-20 西安奇点能源技术有限公司 Three-level topology ANPC four-quadrant operation modulation method
CN113098310A (en) * 2021-05-24 2021-07-09 青岛大学 Active clamping three-level inverter circuit and control method thereof
CN113872460A (en) * 2021-11-05 2021-12-31 阳光电源股份有限公司 Switching modulation method for inverter and ANPC type three-level inverter circuit
WO2022041813A1 (en) * 2020-08-25 2022-03-03 远景能源有限公司 Doubly-fed converter and modulation method thereof
CN115296557A (en) * 2022-08-30 2022-11-04 北京索英电气技术有限公司 Active neutral point clamped three-level converter and control method
CN115632567A (en) * 2022-10-12 2023-01-20 上海正泰电源系统有限公司 Reverse carrier phase-shift modulation method applied to ANPC type three-level inverter
CN116760309A (en) * 2023-08-21 2023-09-15 江苏天合清特电气有限公司 ANPC type three-level inverter circuit and modulation method thereof

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CN108471247A (en) * 2018-03-30 2018-08-31 华为技术有限公司 Control method, the device and system of three-level inverter
CN108880311A (en) * 2018-07-05 2018-11-23 华为技术有限公司 A kind of clamp modulator approach, device and the inverter of multi-electrical level inverter
WO2020006980A1 (en) * 2018-07-05 2020-01-09 华为技术有限公司 Clamp modulation method for multi-level inverter, device, and inverter
US11716032B2 (en) 2018-07-05 2023-08-01 Huawei Digital Power Technologies Co., Ltd. Multi-level inverter clamping modulation method and apparatus, and inverter
US11356034B2 (en) 2018-07-05 2022-06-07 Huawei Digital Power Technologies Co., Ltd. Multi-level inverter clamping modulation method and apparatus, and inverter
CN110707957B (en) * 2018-07-10 2021-07-06 台达电子工业股份有限公司 Current conversion device with overcurrent protection control
CN110707957A (en) * 2018-07-10 2020-01-17 台达电子工业股份有限公司 Current conversion device with overcurrent protection control
EP3595161A1 (en) * 2018-07-10 2020-01-15 Delta Electronics, Inc. Inverter apparatus with overcurrent protection control
CN111478609B (en) * 2020-05-19 2021-05-04 深圳科士达科技股份有限公司 Active neutral point clamping type three-level converter and control method and control device thereof
CN111478609A (en) * 2020-05-19 2020-07-31 深圳科士达科技股份有限公司 Active neutral point clamping type three-level converter and control method and control device thereof
GB2618406A (en) * 2020-08-25 2023-11-08 Envision Energy Co Ltd Doubly-fed converter and modulation method thereof
WO2022041813A1 (en) * 2020-08-25 2022-03-03 远景能源有限公司 Doubly-fed converter and modulation method thereof
CN112688274A (en) * 2020-12-08 2021-04-20 特变电工西安电气科技有限公司 Fault wave sealing method for photovoltaic grid-connected inverter
CN112688584A (en) * 2020-12-15 2021-04-20 西安奇点能源技术有限公司 Three-level topology ANPC four-quadrant operation modulation method
CN112688584B (en) * 2020-12-15 2022-12-30 西安奇点能源股份有限公司 Three-level topology ANPC four-quadrant operation modulation method
CN113098310A (en) * 2021-05-24 2021-07-09 青岛大学 Active clamping three-level inverter circuit and control method thereof
CN113098310B (en) * 2021-05-24 2022-06-07 青岛大学 Active clamping three-level inverter circuit and control method thereof
CN113872460A (en) * 2021-11-05 2021-12-31 阳光电源股份有限公司 Switching modulation method for inverter and ANPC type three-level inverter circuit
CN115296557A (en) * 2022-08-30 2022-11-04 北京索英电气技术有限公司 Active neutral point clamped three-level converter and control method
CN115632567A (en) * 2022-10-12 2023-01-20 上海正泰电源系统有限公司 Reverse carrier phase-shift modulation method applied to ANPC type three-level inverter
CN115632567B (en) * 2022-10-12 2024-04-02 上海正泰电源系统有限公司 Reverse carrier phase-shift modulation method applied to ANPC type three-level inverter
CN116760309A (en) * 2023-08-21 2023-09-15 江苏天合清特电气有限公司 ANPC type three-level inverter circuit and modulation method thereof
CN116760309B (en) * 2023-08-21 2024-01-19 江苏天合清特电气有限公司 ANPC type three-level inverter circuit and modulation method thereof

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