CN102843055B - A kind of three-level inverter neutral-point-potential balance control device and method - Google Patents
A kind of three-level inverter neutral-point-potential balance control device and method Download PDFInfo
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- CN102843055B CN102843055B CN201210324672.9A CN201210324672A CN102843055B CN 102843055 B CN102843055 B CN 102843055B CN 201210324672 A CN201210324672 A CN 201210324672A CN 102843055 B CN102843055 B CN 102843055B
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Abstract
The present invention is applicable to field of power electronics, relates to a kind of three-level inverter neutral-point-potential balance control device and method.Described device includes voltage acquisition unit, proportional plus integral control unit, pulse width control unit, voltage regulation unit.Then it is carried out proportional plus integral control by the detection upper and lower capacitance voltage of bus in real time and processes generation controlled quentity controlled variable by neutral-point potential balance device provided by the present invention, and according to this controlled quentity controlled variable, the pulse width modulation duty of voltage regulation unit power tube is adjusted.The present invention has simple in construction, and control realization is easy, controls effect unrelated with the modulation of inversion system when power factor (PF), it is possible to by neutral point voltage control in a smaller scope.
Description
Technical field
The invention belongs to field of power electronics, relate to a kind of three-level inverter neutral-point-potential balance control device and method.
Background technology
Three-level inverter has compact conformation, and output voltage current harmonic content is low, and the voltage that switching tube bears is only the advantages such as the half of DC bus-bar voltage.So being used widely in high voltage appearance large-power occasions.
There is an intrinsic shortcoming in three-level inverter, namely there is mid-point voltage imbalance problem.Mid-point voltage imbalance can cause serious harm: inverter output voltage waveform is distorted；The voltage that switching device bears is unbalanced；The voltage pulsation of DC bus capacitor reduces the life-span of electric capacity.In order to enable inverter normal operation, should make great efforts so that mid-point voltage keeps balance.
The method suppressing mid-point potential offset has the big class of hardware and software two.Single complexity suppressing mid-point potential offset will increase control from software.List will increase a large amount of components and parts from hardware suppression neutral-point potential balance makes cost increase.Therefore, this area urgently proposes a kind of combining from hardware and software two aspect it is thus possible to effectively suppress the device and method of the skew of three-level inverter midpoint potential.
Summary of the invention
The present invention provides a kind of three-level inverter neutral balance to control device and method, suppresses mid-point potential offset from the effective three-level inverter of software and hardware two aspect, thus reaching the balance of voltage on positive and negative busbar.
The present invention is achieved through the following technical solutions, a kind of three-level inverter neutral-point-potential balance control device, described device, for controlling the neutral-point potential balance of three-level inverter, this device includes: voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage regulation unit, wherein:
Voltage acquisition unit, for obtaining on bus capacitance voltage under capacitance voltage and bus, described voltage acquisition unit input is connected with bus and the bus midpoint terminal of three-level inverter；
Proportional plus integral control unit, for capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus, the described input of proportional plus integral control unit is connected with the outfan of voltage acquisition unit；
Pulse width control unit, for producing pulse-width signal thus controlling voltage regulation unit according to proportional integral result, the input of described pulse width control unit is connected with the outfan of proportional plus integral control unit；
Voltage regulation unit, for regulating the upper and lower capacitance voltage of bus according to pulse-width signal, so that neutral-point potential balance, the input of described voltage regulation unit is connected with the outfan of pulse width control unit.
Especially, described proportional plus integral control unit farther includes:
Computing module, for according to capacitance voltage on bus and under bus capacitance voltage calculate three-level inverter unbalance of neutral-point voltage amount, the input of described computing module is connected with the outfan of voltage acquisition unit；
Kernel control module, proportional integral process is carried out for alignment voltage deviation, producing proportional plus integral control amount, the input of described kernel control module is connected with the outfan of computing module, and the outfan of described kernel control module is the outfan of proportional plus integral control unit.
Especially, described pulse width control unit farther includes:
Fine setting module, is used for judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half and reaches the upper and lower capacitance voltage of bus is finely tuned, described fine setting module input is connected with proportional plus integral control unit outfan；
Modulation module, for producing, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary, the input of described modulation module is connected with the outfan of fine setting module, and modulation module outfan is the outfan of pulse width control unit.
Especially, described voltage regulation unit farther includes: two power switch pipes, two diodes, inductance, two groups of bus capacitors, wherein:
Two groups of bus capacitors are in series connected across being connected on dc bus, and two power switch pipes are in series connected across being connected on dc bus, two diodes respectively with two power switch pipe reverse parallel connections, inductance L is connected across between two groups of bus capacitor midpoints and two power switch pipe midpoints.
Especially, two switching tubes that the pulse-width signal that described device utilizes two-way complementary controls in voltage regulation unit respectively.
Especially, described voltage regulation unit specifically includes: when the first electric capacity both end voltage+BUS is more than the second electric capacity both end voltage-BUS, increases the modulation signal pulsewidth controlling the first switching tube and reduces the pulsewidth of the modulation signal controlling second switch pipe simultaneously；When the first electric capacity both end voltage+BUS is less than the second electric capacity both end voltage-BUS, reduces the modulation signal pulsewidth controlling the first switching tube and increase the modulation signal pulsewidth controlling second switch pipe simultaneously.
Present invention also offers a kind of three-level inverter neutral-point potential balance control method, for controlling the neutral-point potential balance of three-level inverter, comprise the steps:
S1, voltage acquisition unit obtain on bus capacitance voltage under capacitance voltage and bus；
Capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus by S2, proportional plus integral control unit；
S3, pulse width control unit produce pulse-width signal according to proportional integral result, are used for controlling voltage regulation unit；
S4, voltage regulation unit regulate the upper and lower capacitance voltage of bus according to pulse-width signal, so that neutral-point potential balance.
Especially, step S2 is specifically: described proportional plus integral control unit is by calculating three-level inverter unbalance of neutral-point voltage amount, and alignment voltage deviation carries out proportional integral process, produces proportional plus integral control amount.
Especially, step S3 is specifically: described pulse width control unit is by judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half to reach the upper and lower capacitance voltage of bus is finely tuned, and produces, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary.
Especially, step S4 is specifically: two switching tubes that the pulse-width signal utilizing two-way complementary controls in voltage regulation unit respectively, when the first electric capacity both end voltage+BUS is more than the second electric capacity both end voltage-BUS, increases the modulation signal pulsewidth controlling the first switching tube and reduce the pulsewidth of the modulation signal controlling second switch pipe simultaneously；When the first electric capacity both end voltage+BUS is less than the second electric capacity both end voltage-BUS, reduces the modulation signal pulsewidth controlling the first switching tube and increase the modulation signal pulsewidth controlling second switch pipe simultaneously.
The invention is characterized in that mode that software and hardware combines is to suppress three-level inverter mid-point potential offset, structure and control all fairly simple, improve the stability of three-level inverter.
Accompanying drawing explanation
Fig. 1 is three-level inverter neutral-point-potential balance control system structure of device block diagram described in embodiment；
Fig. 2 is proportional plus integral control unit module block diagram described in embodiment；
Fig. 3 is pulse width control unit module frame chart described in embodiment；
Fig. 4 is three-level inverter neutral-point potential balance control method schematic flow sheet described in embodiment；
Fig. 5 is voltage regulation unit circuit theory diagrams described in the preferred embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described with being embodied as example.
Fig. 1 is that three-level inverter neutral balance described in the present embodiment controls system structure of device block diagram, as shown in Figure 1, three-level inverter neutral balance of the present invention controls device and includes: 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.
Voltage acquisition unit 101, for obtaining on bus capacitance voltage under capacitance voltage and bus, described voltage acquisition unit input is connected with bus and the bus midpoint terminal of three-level inverter；
Proportional plus integral control unit 102, for capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus, the input of described proportional plus integral control unit 102 is connected with the outfan of voltage acquisition unit 101；
Pulse width control unit 103, is used for producing pulse-width signal, and the input of described pulse width control unit is connected with the outfan of proportional plus integral control unit 102；
Voltage regulation unit 104, is used for regulating the upper and lower capacitance voltage of bus and makes neutral-point potential balance, and the input of described voltage regulation unit 104 is connected with the outfan of pulse width control unit 103.
Fig. 2 is proportional plus integral control unit module block diagram described in embodiment, as in figure 2 it is shown, described proportional plus integral control unit 102 farther includes:
Computing module 201, for according to capacitance voltage on bus and under bus capacitance voltage calculate three-level inverter unbalance of neutral-point voltage amount, the input of described computing module 201 is connected with the outfan of voltage acquisition unit 101；
Kernel control module 202, proportional integral process is carried out for alignment voltage deviation, produce proportional plus integral control amount, the input of described kernel control module 202 is connected with the outfan of computing module 201, the outfan that outfan is proportional plus integral control unit 102 of described kernel control module 202.
Fig. 3 is pulse width control unit module frame chart described in embodiment, as it is shown on figure 3, described pulse width control unit 103 farther includes:
Fine setting module 301, is used for judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half and reaches the upper and lower capacitance voltage of bus is finely tuned, described fine setting module 301 input is connected with proportional plus integral control unit 102 outfan；
Modulation module 302, for producing, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary, the input of described modulation module 302 is connected with the outfan of fine setting module 301, and modulation module 302 outfan is the outfan of pulse width control unit 103.
Fig. 4 is three-level inverter neutral-point potential balance control method schematic flow sheet described in embodiment, as shown in Figure 4, three-level inverter neutral balance described in Fig. 1 control each unit in device, module workflow as follows:
S1, voltage acquisition unit obtain on bus capacitance voltage under capacitance voltage and bus；
Capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus by S2, proportional plus integral control unit；
Further, described proportional plus integral control unit is by calculating three-level inverter unbalance of neutral-point voltage amount, and alignment voltage deviation carries out proportional integral process, produces proportional plus integral control amount.
S3, pulse width control unit produce pulse-width signal according to proportional integral result, are used for controlling voltage regulation unit；
Further, described pulse width control unit is by judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half to reach the upper and lower capacitance voltage of bus is finely tuned, and produces, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary.
S4, voltage regulation unit regulate the upper and lower capacitance voltage of bus according to pulse-width signal, so that neutral-point potential balance.
As the presently preferred embodiments, below in conjunction with Fig. 5 the present invention made and further illustrating.
Fig. 5 is voltage regulation unit 104 circuit theory diagrams of the present invention, as it is shown in figure 5, described voltage regulation unit 104 includes: two power switch pipe Q1, Q2, two diode D1, D2, inductance L, two groups of bus capacitors C1, C2.Two groups of bus capacitors C1, C2 are in series connected across being connected on dc bus, two power switch pipes Q1, Q2 are in series connected across being connected on dc bus, two diodes D1, D2 respectively with two power switch pipe Q1, Q2 reverse parallel connections, inductance L is connected across between two groups of bus capacitor C1, C2 midpoints and two power switch pipe Q1, Q2 midpoints.
As the presently preferred embodiments, in the present invention, voltage acquisition unit 101 gathers electric capacity C1 both end voltage+BUS and electric capacity C2 both end voltage-BUS(as shown in Figure 5).
The input of proportional plus integral control unit 102 is connected with voltage acquisition unit 101 outfan, the difference of electric capacity C1, C2 both end voltage is carried out proportional integral computing and obtains proportional plus integral control amount.
Pulse width control unit 103 produces, according to proportional plus integral control amount, the pulse-width signal that output two-way is complementary, controls described voltage regulation unit 104.
Further, shown in Fig. 5, the pulse-width signal of two-way complementation controls two switching tube Q1, Q2 in voltage regulation unit 104 respectively, when electric capacity C1 both end voltage+BUS is more than electric capacity C2 both end voltage-BUS, increases the modulation signal pulsewidth controlling switching tube Q1 and reduce the pulsewidth of the modulation signal controlling switching tube Q2 simultaneously；When electric capacity C1 both end voltage+BUS is less than electric capacity C2 both end voltage-BUS, reduces the modulation signal pulsewidth controlling switching tube Q1 and increase the modulation signal pulsewidth controlling switching tube Q2 simultaneously.
When on bus, (i.e. positive bus-bar) voltage+BUS is more than (i.e. negative busbar) voltage-BUS under bus, switching tube Q1 opens, switching tube Q2 turns off, and electric capacity C1 shifts energy to inductance L；When switching tube Q1 shutoff, switching tube Q2 open, in inductance L, electric current passes through diode D2 afterflow, stored energy transfer in inductance L, to electric capacity C2, regulates through after a while, and on final bus, under capacitance voltage+BUS and bus, the voltage of capacitance voltage-BUS can reach balance；When on bus voltage+BUS less than bus under voltage-BUS time, switching tube Q2 opens, switching tube Q1 turn off, electric capacity C2 to inductance L shift energy；When switching tube Q2 shutoff, switching tube Q1 open, in inductance L, electric current passes through diode D1 afterflow, and the stored energy transfer in inductance L, to electric capacity C1, regulates through after a while, and the voltage of final positive bus-bar voltage+BUS and negative busbar voltage-BUS can reach balance.
Take the mode that such scheme, the present invention take software and hardware to combine can effectively suppress three-level inverter mid-point potential offset, structure and control all fairly simple, improve the stability of three-level inverter.
Below it is only the explanation done for specific embodiments of the invention and know-why thereof; and the restriction not technology contents of the present invention carried out; any those familiar with the art is in technical scope disclosed in this invention; the change being readily apparent that or replacement, all should be encompassed in protection scope of the present invention.
Claims (8)
1. a three-level inverter neutral-point-potential balance control device, for controlling the neutral-point potential balance of three-level inverter, it is characterized in that, this device includes: voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage regulation unit, wherein:
Voltage acquisition unit, for obtaining on bus capacitance voltage under capacitance voltage and bus, described voltage acquisition unit input is connected with bus and the bus midpoint terminal of three-level inverter；
Proportional plus integral control unit, for capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus, the described input of proportional plus integral control unit is connected with the outfan of voltage acquisition unit；
Pulse width control unit, for producing pulse-width signal thus controlling voltage regulation unit according to proportional integral result, the input of described pulse width control unit is connected with the outfan of proportional plus integral control unit；
Wherein, described pulse width control unit farther includes:
Fine setting module, is used for judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half and reaches the upper and lower capacitance voltage of bus is finely tuned, described fine setting module input is connected with proportional plus integral control unit outfan；
Modulation module, for producing, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary, the input of described modulation module is connected with the outfan of fine setting module, and modulation module outfan is the outfan of pulse width control unit；
Voltage regulation unit, for regulating the upper and lower capacitance voltage of bus according to pulse-width signal, so that neutral-point potential balance, the input of described voltage regulation unit is connected with the outfan of pulse width control unit.
2. device as claimed in claim 1, it is characterised in that: described proportional plus integral control unit farther includes:
Computing module, for according to capacitance voltage on bus and under bus capacitance voltage calculate three-level inverter unbalance of neutral-point voltage amount, the input of described computing module is connected with the outfan of voltage acquisition unit；
Kernel control module, proportional integral process is carried out for alignment voltage deviation, producing proportional plus integral control amount, the input of described kernel control module is connected with the outfan of computing module, and the outfan of described kernel control module is the outfan of proportional plus integral control unit.
3. device as claimed in claim 1, it is characterised in that: described voltage regulation unit farther includes: two power switch pipes, two diodes, inductance, two groups of bus capacitors, wherein:
Two groups of bus capacitors are in series connected across being connected on dc bus, and two power switch pipes are in series connected across being connected on dc bus, two diodes respectively with two power switch pipe reverse parallel connections, inductance is connected across between two groups of bus capacitor midpoints and two power switch pipe midpoints.
4. device as claimed in claim 3, it is characterised in that:
Two power switch pipes that the pulse-width signal that described device utilizes two-way complementary controls in voltage regulation unit respectively.
5. device as claimed in claim 4, it is characterised in that:
Described voltage regulation unit specifically includes: when the first electric capacity both end voltage+BUS is more than the second electric capacity both end voltage-BUS, increases the modulation signal pulsewidth controlling the first switching tube and reduces the pulsewidth of the modulation signal controlling second switch pipe simultaneously；When the first electric capacity both end voltage+BUS is less than the second electric capacity both end voltage-BUS, reduces the modulation signal pulsewidth controlling the first switching tube and increase the modulation signal pulsewidth controlling second switch pipe simultaneously.
6. a three-level inverter neutral-point potential balance control method, for controlling the neutral-point potential balance of three-level inverter, it is characterised in that comprise the steps:
S1, voltage acquisition unit obtain on bus capacitance voltage under capacitance voltage and bus；
Capacitance voltage on bus is carried out proportional integral process with capacitance voltage difference under bus by S2, proportional plus integral control unit；
S3, pulse width control unit produce pulse-width signal according to proportional integral result, for controlling voltage regulation unit, wherein, described pulse width control unit is by judging that unbalance of neutral-point voltage amount size decides whether that comparative example integration control amount reduces by half to reach the upper and lower capacitance voltage of bus is finely tuned, and produces, according to proportional plus integral control amount, the pulse-width signal that two-way is complementary；
S4, voltage regulation unit regulate the upper and lower capacitance voltage of bus according to pulse-width signal, so that neutral-point potential balance.
7. method as claimed in claim 6, it is characterised in that step S2 specifically:
Described proportional plus integral control unit is by calculating three-level inverter unbalance of neutral-point voltage amount, and alignment voltage deviation carries out proportional integral process, produces proportional plus integral control amount.
8. method as claimed in claims 6 or 7, it is characterised in that step S4 specifically:
Two switching tubes that the pulse-width signal utilizing two-way complementary controls in voltage regulation unit respectively, when the first electric capacity both end voltage+BUS is more than the second electric capacity both end voltage-BUS, increases the modulation signal pulsewidth controlling the first switching tube and reduce the pulsewidth of the modulation signal controlling second switch pipe simultaneously；When the first electric capacity both end voltage+BUS is less than the second electric capacity both end voltage-BUS, reduces the modulation signal pulsewidth controlling the first switching tube and increase the modulation signal pulsewidth controlling second switch pipe simultaneously.
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| KR101462750B1 (en) * | 2013-01-16 | 2014-11-17 | 삼성전기주식회사 | Multi level inverter |
| 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 |
| 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 |
| DE102013108670A1 (en) * | 2013-08-09 | 2015-02-12 | Ge Energy Power Conversion Gmbh | Method and device for operating a power converter |
| EP2849331B1 (en) * | 2013-09-11 | 2020-02-12 | ABB Schweiz AG | Method and apparatus for balancing voltages of multi-level inverter DC link |
| CN103607131B (en) * | 2013-12-03 | 2016-01-20 | 上海理工大学 | Three-level inverter neutral-point potential balance control method |
| CN103944167B (en) * | 2014-04-04 | 2016-04-20 | 武汉武新电气科技有限公司 | A kind of method and apparatus of balanced capacitor voltage |
| CN103997239A (en) * | 2014-06-09 | 2014-08-20 | 安徽赛瑞储能设备有限公司 | T-type three-level converter midpoint voltage sharing circuit |
| US20170288574A1 (en) * | 2014-08-08 | 2017-10-05 | Otis Elevator Company | Neutral point regulator hardware for a multi-level drive |
| CN105991058B (en) * | 2015-01-29 | 2019-01-04 | 台达电子工业股份有限公司 | DC communication conversion equipment and its operating method |
| CN106100402B (en) * | 2016-07-07 | 2019-01-11 | 西安理工大学 | A kind of T-type three-level inverter and its neutral balance control method |
| CN110545035A (en) * | 2019-09-29 | 2019-12-06 | 深圳威迈斯新能源股份有限公司 | voltage-sharing control method and device for three-phase four-wire system PFC bus |
| 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 |
| CN112187080B (en) * | 2020-10-14 | 2021-08-06 | 河南科技大学 | Single-phase three-level converter system and control method based on robust H infinity and voltage sharing |
| 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 |
| 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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