CN102843055A - Neutral-point potential balance control device and method for three-level inverter - Google Patents
Neutral-point potential balance control device and method for three-level inverter Download PDFInfo
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- CN102843055A CN102843055A CN2012103246729A CN201210324672A CN102843055A CN 102843055 A CN102843055 A CN 102843055A CN 2012103246729 A CN2012103246729 A CN 2012103246729A CN 201210324672 A CN201210324672 A CN 201210324672A CN 102843055 A CN102843055 A CN 102843055A
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Abstract
The invention is suitable for the field of power electronics, and relates to a neutral-point potential balance control device and method for a three-level inverter. The device comprises a voltage acquisition unit, a proportional-integral control unit, a pulse width control unit and a voltage regulating unit. According to the neutral-point potential balance control device provided by the invention, a control quantity is generated by detecting capacitor voltages above and below a bus in real time and performing proportional-integral control processing, and the pulse width modulation duty ratio of a voltage regulating unit power tube is regulated according to the control quantity. The neutral-point potential balance control device is simple in structure, and is easy and convenient for control realization; and a control effect is irrelevant to the modulation ratio and power factor of an inversion system, and neutral-point potential can be controlled in a relatively small range.
Description
Technical field
The invention belongs to field of power electronics, relate to a kind of three-level inverter midpoint potential balance control device and method.
Background technology
Three-level inverter has compact conformation, and the output voltage current harmonic content is low, and the voltage that switching tube bore is merely advantages such as half of DC bus-bar voltage.So be used widely in the high voltage appearance large-power occasions.
There is an intrinsic shortcoming in three-level inverter, promptly has the mid-point voltage imbalance problem.The mid-point voltage imbalance can cause serious harm: the inverter output voltage waveform distorts; The voltage that switching device bears is unbalanced; The voltage fluctuation of dc bus capacitor has reduced the life-span of electric capacity.In order to make the inverter can operate as normal, should make great efforts to make mid-point voltage to keep balance.
The method that suppresses mid-point potential offset has two big types of hardware and softwares.Single complexity that will increase control from software inhibition mid-point potential offset.List will increase a large amount of components and parts from hardware inhibition midpoint potential balance increases cost.Therefore, thus demand proposing a kind of combining in this area urgently and can effectively suppress the device and method of the skew of three-level inverter midpoint potential from hardware and software two aspects.
Summary of the invention
The present invention provides a kind of three-level inverter neutral balance control device and method, and effective three-level inverter suppresses mid-point potential offset from software and hardware two aspects, thereby reaches the balance of voltage on the positive and negative busbar.
The present invention realizes through following technical scheme; A kind of three-level inverter midpoint potential balance control device; Said device; Be used to control the midpoint potential balance of three-level inverter, this device comprises: voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage-regulation unit, wherein:
Voltage acquisition unit is used to obtain on the bus capacitance voltage under the capacitance voltage and bus, and said voltage acquisition unit input is connected with the bus and the bus mid point terminal of three-level inverter;
The proportional plus integral control unit is used for that capacitance voltage difference under capacitance voltage on the bus and the bus is carried out proportional integral and handles, and the input of said proportional plus integral control unit is connected with the output of voltage acquisition unit;
Pulse width control unit, thus be used for producing pulse-width signal control voltage-regulation unit according to the proportional integral result, and the input of said pulse width control unit is connected with the output of proportional plus integral control unit;
The voltage-regulation unit is used for regulating bus capacitance voltage up and down according to pulse-width signal, so that the midpoint potential balance, the input of said voltage-regulation unit is connected with the output of pulse width control unit.
Special, said proportional plus integral control unit further comprises:
Computing module is used for calculating three-level inverter unbalance of neutral-point voltage amount according to capacitance voltage under capacitance voltage on the bus and the bus, and the input of said computing module is connected with the output of voltage acquisition unit;
Kernel control module; Be used for the alignment voltage deviation and carry out the proportional integral processing; Produce the proportional plus integral control amount, the input of said kernel control module is connected with the output of computing module, and the output of said kernel control module is the output of proportional plus integral control unit.
Special, said pulse width control unit further comprises:
The fine setting module, be used to judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount to reduce by half to reach to bus up and down capacitance voltage finely tune, said fine setting module input is connected with proportional plus integral control unit output;
Modulation module is used for giving birth to the complementary pulse-width signal of two-way according to the proportional plus integral control volume production, and the input of said modulation module is connected with the output of fine setting module, and the modulation module output is the output of pulse width control unit.
Special, said voltage-regulation unit further comprises: two power switch pipes, two diodes, an inductance, two groups of bus capacitors, wherein:
The series connection of two groups of bus capacitors is connected across on the dc bus, and two power switch pipes series connection are connected across on the dc bus, two diodes respectively with two power switch pipe reverse parallel connections, inductance L is connected across between two groups of bus capacitor mid points and two power switch pipe mid points.
Special, said device utilizes the complementary pulse-width signal of two-way to control two switching tubes in the voltage-regulation unit respectively.
Special, said voltage-regulation unit specifically comprises: as first electric capacity voltage+BUS during greater than second electric capacity voltage-BUS, the modulation signal pulsewidth that increases control first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity voltage+BUS during less than second electric capacity voltage-BUS, the modulation signal pulsewidth that reduces to control first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
The present invention also provides a kind of three-level inverter midpoint potential balance control method, is used to control the midpoint potential balance of three-level inverter, comprises the steps:
S1, voltage acquisition unit obtain on the bus capacitance voltage under the capacitance voltage and bus;
S2, proportional plus integral control unit carry out proportional integral to capacitance voltage difference under capacitance voltage on the bus and the bus to be handled;
S3, pulse width control unit produce pulse-width signal according to the proportional integral result, are used to control the voltage-regulation unit;
Bus capacitance voltage is up and down regulated according to pulse-width signal in S4, voltage-regulation unit, so that the midpoint potential balance.
Special, step S2 specifically: said proportional plus integral control unit is through calculating three-level inverter unbalance of neutral-point voltage amount, and the alignment voltage deviation carries out proportional integral to be handled, and produces the proportional plus integral control amount.
Special; Step S3 is specifically: said pulse width control unit through judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount reduce by half with reach to bus up and down capacitance voltage finely tune, and give birth to the complementary pulse-width signal of two-way according to the proportional plus integral control volume production.
Special; Step S4 is specifically: utilize the complementary pulse-width signal of two-way to control two switching tubes in the voltage-regulation unit respectively; As first electric capacity voltage+BUS during greater than second electric capacity voltage-BUS, the modulation signal pulsewidth that increases control first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity voltage+BUS during less than second electric capacity voltage-BUS, the modulation signal pulsewidth that reduces to control first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
The present invention suppresses the three-level inverter mid-point potential offset through the mode of taking software and hardware to combine, and structure is all fairly simple with control, has improved the stability of three-level inverter.
Description of drawings
Fig. 1 is the said three-level inverter midpoint potential of an embodiment balance control device system architecture diagram;
Fig. 2 is the said proportional plus integral control unit module of an embodiment block diagram;
Fig. 3 is the said pulse width control unit module frame chart of embodiment;
Fig. 4 is the said three-level inverter midpoint potential of an embodiment balance control method schematic flow sheet;
Fig. 5 is the said voltage-regulation element circuit of a preferred embodiment of the present invention schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and practical implementation instance the present invention is further specified.
Fig. 1 is the said three-level inverter neutral balance of a present embodiment control device system architecture diagram; As shown in Figure 1; Three-level inverter neutral balance control device according to the invention comprises: voltage acquisition unit 101, proportional plus integral control unit 102, pulse width control unit 103 and voltage-regulation unit 104; Wherein, said units is connected according to this.
Proportional plus integral control unit 102 is used for that capacitance voltage difference under capacitance voltage on the bus and the bus is carried out proportional integral and handles, and the input of said proportional plus integral control unit 102 is connected with the output of voltage acquisition unit 101;
Pulse width control unit 103 is used to produce pulse-width signal, and the input of said pulse width control unit is connected with the output of proportional plus integral control unit 102;
Voltage-regulation unit 104, be used to regulate bus up and down capacitance voltage make the midpoint potential balance, the input of said voltage-regulation unit 104 is connected with the output of pulse width control unit 103.
Fig. 2 is the said proportional plus integral control unit module of embodiment block diagram, and is as shown in Figure 2, and said proportional plus integral control unit 102 further comprises:
Kernel control module 202; Be used for the alignment voltage deviation and carry out the proportional integral processing; Produce the proportional plus integral control amount; The input of said kernel control module 202 is connected with the output of computing module 201, and the output of said kernel control module 202 is the output of proportional plus integral control unit 102.
Fig. 3 is the said pulse width control unit module frame chart of embodiment, and is as shown in Figure 3, and said pulse width control unit 103 further comprises:
Fig. 4 is the said three-level inverter midpoint potential of embodiment balance control method schematic flow sheet, and is as shown in Figure 4, and the workflow of each unit, module is following in the said three-level inverter neutral balance of Fig. 1 control device:
S1, voltage acquisition unit obtain on the bus capacitance voltage under the capacitance voltage and bus;
S2, proportional plus integral control unit carry out proportional integral to capacitance voltage difference under capacitance voltage on the bus and the bus to be handled;
Further, said proportional plus integral control unit is through calculating three-level inverter unbalance of neutral-point voltage amount, and the alignment voltage deviation carries out proportional integral to be handled, and produces the proportional plus integral control amount.
S3, pulse width control unit produce pulse-width signal according to the proportional integral result, are used to control the voltage-regulation unit;
Further, said pulse width control unit through judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount reduce by half with reach to bus up and down capacitance voltage finely tune, and give birth to the complementary pulse-width signal of two-way according to the proportional plus integral control volume production.
Bus capacitance voltage is up and down regulated according to pulse-width signal in S4, voltage-regulation unit, so that the midpoint potential balance.
As preferred embodiment, below in conjunction with Fig. 5 the present invention is made and to further specify.
Fig. 5 is voltage-regulation according to the invention unit 104 circuit theory diagrams, and is as shown in Figure 5, and said voltage-regulation unit 104 comprises: two power switch pipe Q1, Q2, two diode D1, D2, inductance L, two groups of bus capacitor C1, C2.Two groups of bus capacitor C1, C2 series connection are connected across on the dc bus; Two power switch pipe Q1, Q2 series connection are connected across on the dc bus; Two diode D1, D2 respectively with two power switch pipe Q1, Q2 reverse parallel connection, inductance L is connected across between two groups of bus capacitor C1, C2 mid point and two power switch pipe Q1, Q2 mid point.
As preferred embodiment, among the present invention, voltage acquisition unit 101 is gathered capacitor C 1 voltage+BUS and capacitor C 2 voltage-BUS (as shown in Figure 5).
The input of proportional plus integral control unit 102 is connected with voltage acquisition unit 101 outputs, the difference of capacitor C 1, C2 voltage is carried out the proportional integral computing obtain the proportional plus integral control amount.
Pulse width control unit 103 is given birth to the complementary pulse-width signal of output two-way according to the proportional plus integral control volume production, controls said voltage-regulation unit 104.
Further; Shown in Fig. 5; The complementary pulse-width signal of two-way is controlled two switching tube Q1, Q2 in the voltage-regulation unit 104 respectively; As capacitor C 1 voltage+BUS during greater than capacitor C 2 voltage-BUS, the modulation signal pulsewidth that increases control switch pipe Q1 reduces the pulsewidth of the modulation signal of control switch pipe Q2 simultaneously; As capacitor C 1 voltage+BUS during less than capacitor C 2 voltage-BUS, the modulation signal pulsewidth that reduces control switch pipe Q1 increases the modulation signal pulsewidth of control switch pipe Q2 simultaneously.
When (being positive bus-bar) voltage+BUS on the bus greater than bus under during (being negative busbar) voltage-BUS, switching tube Q1 opens, switching tube Q2 turn-offs, capacitor C 1 shifts energy to inductance L; When switching tube Q1 shutoff, when switching tube Q2 opens; Electric current is through diode D2 afterflow in the inductance L; Energy storage in the inductance L is transferred in the capacitor C 2, regulates through after a while, on the final bus under capacitance voltage+BUS and the bus voltage of capacitance voltage-BUS can reach balance; When voltage+BUS on the bus less than bus under during voltage-BUS, switching tube Q2 opens, switching tube Q1 turn-offs, capacitor C 2 shifts energy to inductance L; When switching tube Q2 shutoff, when switching tube Q1 opens, electric current is through diode D1 afterflow in the inductance L, and the energy storage in the inductance L is transferred in the capacitor C 1, and through regulating after a while, the voltage of final positive bus-bar voltage+BUS and negative busbar voltage-BUS can reach balance.
Take such scheme, the mode that the present invention takes software and hardware to combine can effectively suppress the three-level inverter mid-point potential offset, and structure is all fairly simple with control, has improved the stability of three-level inverter.
It below only is the explanation of doing to specific embodiment of the present invention and know-why thereof; And be not the restriction that technology contents of the present invention is carried out; Any technical staff who is familiar with the present technique field is in the disclosed technical scope of the present invention; Variation of being expected easily or replacement all should be encompassed in protection scope of the present invention.
Claims (10)
1. three-level inverter midpoint potential balance control device; Be used to control the midpoint potential balance of three-level inverter; It is characterized in that this device comprises: voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage-regulation unit, wherein:
Voltage acquisition unit is used to obtain on the bus capacitance voltage under the capacitance voltage and bus, and said voltage acquisition unit input is connected with the bus and the bus mid point terminal of three-level inverter;
The proportional plus integral control unit is used for that capacitance voltage difference under capacitance voltage on the bus and the bus is carried out proportional integral and handles, and the input of said proportional plus integral control unit is connected with the output of voltage acquisition unit;
Pulse width control unit, thus be used for producing pulse-width signal control voltage-regulation unit according to the proportional integral result, and the input of said pulse width control unit is connected with the output of proportional plus integral control unit;
The voltage-regulation unit is used for regulating bus capacitance voltage up and down according to pulse-width signal, so that the midpoint potential balance, the input of said voltage-regulation unit is connected with the output of pulse width control unit.
2. device as claimed in claim 1 is characterized in that: said proportional plus integral control unit further comprises:
Computing module is used for calculating three-level inverter unbalance of neutral-point voltage amount according to capacitance voltage under capacitance voltage on the bus and the bus, and the input of said computing module is connected with the output of voltage acquisition unit;
Kernel control module; Be used for the alignment voltage deviation and carry out the proportional integral processing; Produce the proportional plus integral control amount, the input of said kernel control module is connected with the output of computing module, and the output of said kernel control module is the output of proportional plus integral control unit.
3. device as claimed in claim 1 is characterized in that: said pulse width control unit further comprises:
The fine setting module, be used to judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount to reduce by half to reach to bus up and down capacitance voltage finely tune, said fine setting module input is connected with proportional plus integral control unit output;
Modulation module is used for giving birth to the complementary pulse-width signal of two-way according to the proportional plus integral control volume production, and the input of said modulation module is connected with the output of fine setting module, and the modulation module output is the output of pulse width control unit.
4. device as claimed in claim 1 is characterized in that: said voltage-regulation unit further comprises: two power switch pipes, two diodes, an inductance, two groups of bus capacitors, wherein:
The series connection of two groups of bus capacitors is connected across on the dc bus, and two power switch pipes series connection are connected across on the dc bus, two diodes respectively with two power switch pipe reverse parallel connections, inductance L is connected across between two groups of bus capacitor mid points and two power switch pipe mid points.
5. like the described device of one of claim 1-4, it is characterized in that:
Said device utilizes the complementary pulse-width signal of two-way to control two switching tubes in the voltage-regulation unit respectively.
6. device as claimed in claim 5 is characterized in that:
Said voltage-regulation unit specifically comprises: as first electric capacity voltage+BUS during greater than second electric capacity voltage-BUS, the modulation signal pulsewidth that increases control first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity voltage+BUS during less than second electric capacity voltage-BUS, the modulation signal pulsewidth that reduces to control first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
7. three-level inverter midpoint potential balance control method is used to control the midpoint potential balance of three-level inverter, it is characterized in that, comprises the steps:
S1, voltage acquisition unit obtain on the bus capacitance voltage under the capacitance voltage and bus;
S2, proportional plus integral control unit carry out proportional integral to capacitance voltage difference under capacitance voltage on the bus and the bus to be handled;
S3, pulse width control unit produce pulse-width signal according to the proportional integral result, are used to control the voltage-regulation unit;
Bus capacitance voltage is up and down regulated according to pulse-width signal in S4, voltage-regulation unit, so that the midpoint potential balance.
8. method as claimed in claim 7 is characterized in that, step S2 specifically:
Said proportional plus integral control unit is through calculating three-level inverter unbalance of neutral-point voltage amount, and the alignment voltage deviation carries out proportional integral to be handled, and produces the proportional plus integral control amount.
9. like claim 7 or 8 described methods, it is characterized in that, step S3 specifically:
Said pulse width control unit through judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount reduce by half with reach to bus up and down capacitance voltage finely tune, and give birth to the complementary pulse-width signal of two-way according to the proportional plus integral control volume production.
10. method as claimed in claim 9 is characterized in that, step S4 specifically:
Utilize the complementary pulse-width signal of two-way to control two switching tubes in the voltage-regulation unit respectively; As first electric capacity voltage+BUS during greater than second electric capacity voltage-BUS, the modulation signal pulsewidth that increases control first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity voltage+BUS during less than second electric capacity voltage-BUS, the modulation signal pulsewidth that reduces to control first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
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| CN103151917A (en) * | 2013-03-22 | 2013-06-12 | 天津大学 | Duty cycle disturbance control method of composite two-way three-level direct-current converter for micro-grid energy storage |
| CN103427693A (en) * | 2013-08-07 | 2013-12-04 | 上海理工大学 | Neutral-point potential balance control system and method for three-level converter |
| CN103607131A (en) * | 2013-12-03 | 2014-02-26 | 上海理工大学 | Neutral point potential balancing control system and method of three-level inverter |
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| CN103151917A (en) * | 2013-03-22 | 2013-06-12 | 天津大学 | Duty cycle disturbance control method of composite two-way three-level direct-current converter for micro-grid energy storage |
| CN103427693A (en) * | 2013-08-07 | 2013-12-04 | 上海理工大学 | Neutral-point potential balance control system and method for three-level converter |
| CN103427693B (en) * | 2013-08-07 | 2015-09-16 | 上海理工大学 | Three-level converter neutral-point-potential balance control system and method |
| CN104348355A (en) * | 2013-08-09 | 2015-02-11 | 通用电气能源能量变换技术有限公司 | Method and device for operating an electrical power converter |
| CN104348355B (en) * | 2013-08-09 | 2019-05-14 | 通用电气能源能量变换技术有限公司 | Method and apparatus for operating electric power converter |
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| CN104426407A (en) * | 2013-09-11 | 2015-03-18 | Abb公司 | Method and apparatus for balancing voltages of multi-level inverter DC link |
| CN103607131A (en) * | 2013-12-03 | 2014-02-26 | 上海理工大学 | Neutral point potential balancing control system and method of three-level inverter |
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| CN112187079B (en) * | 2020-10-14 | 2021-08-06 | 河南科技大学 | Single-phase three-level converter system and control method thereof |
| CN112187078B (en) * | 2020-10-14 | 2021-10-08 | 河南科技大学 | Single-phase three-level converter system and control method based on composite control and particle swarm |
| CN112787530A (en) * | 2021-01-11 | 2021-05-11 | 上海电气富士电机电气技术有限公司 | Three-level inverter with bus midpoint voltage compensation and control method thereof |
| CN112787530B (en) * | 2021-01-11 | 2023-04-07 | 上海电气富士电机电气技术有限公司 | Three-level inverter with bus midpoint voltage compensation and control method thereof |
| CN116760042A (en) * | 2023-08-15 | 2023-09-15 | 锦浪科技股份有限公司 | Bus voltage balance control system and method |
| CN116760042B (en) * | 2023-08-15 | 2023-11-03 | 锦浪科技股份有限公司 | Bus voltage balance control system and method |
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