CN102761285B - A kind of can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage - Google Patents
A kind of can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage Download PDFInfo
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Abstract
A kind of can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage, relate to the three level Neutral Point Clamped PWM(pulse-width modulation of one of the power inverter as connected system) DC-to-AC converter, and use in this three level Neutral Point Clamped PWM inverter device, between two capacitors be connected in series between control positive bus-bar and negative busbar, neutral point voltage (electric current) controls (balance) device, this device is made up of two partial devices, Part I device is three-phase Neutral Point Clamped PWM inverter device, Part II device is the device suppressing neutral point voltage skew, Part II device is connected by the neutral point of series inductance with Part I device, suppress the device of neutral point voltage skew that the neutral point potential of three-phase Neutral Point Clamped PWM inverter device can be suppressed efficiently to change, therefore fail safe can be improved, improve the quality of output voltage.
Description
Technical field
The present invention relates to the power inverters such as the inverter of variable speed drive motor, servo-driver, as one of the power inverter of connected system three level Neutral Point Clamped PWM (pulse-width modulation) DC-to-AC converter and use in this three level Neutral Point Clamped PWM inverter device, control neutral point voltage (electric current) bascule between two capacitors being connected in series between positive bus-bar and negative busbar.
Background technology
As the circuit diagram that Fig. 1 is the main circuit structure representing three level Neutral Point Clamped PWM inverter device.Three level Neutral Point Clamped PWM inverter device is made up of the lead-out terminal UVW of 2 capacitors 7,3 phase, 12 switch elements and 18 diodes 9.In this three level Neutral Point Clamped PWM inverter device, make switch element 8
1, 8
2during conducting, the lead-out terminal of each phase and the positive bus-bar be connected with P point connect, and the output voltage of each phase becomes high level.Make switch element 8
2, 8
3during conducting, the lead-out terminal of each phase is connected with neutral point C point, and the output phase voltage of each phase becomes the intermediate level (neutral point voltage) in the middle of high level and low level.Make switch element 8
3, 8
4during conducting, the lead-out terminal of each phase and the negative busbar be connected with N point connect, and the output phase voltage of each phase becomes low level.In three level Neutral Point Clamped PWM inverter device, general 3 kinds of above patterns are each switch element 8 of basic switching, drive 3 phase loads.
In this three level Neutral Point Clamped PWM inverter device, utilize the dividing potential drop of capacitor 7 to obtain neutral point voltage, but this neutral point voltage change to the electric current of load along with supplying.During neutral point voltage variation, overvoltage acts on capacitor 7, may cause service life reduction or the damage of capacitor 7.Therefore, in the DC-to-AC converter of three level Neutral Point Clamped PWM, need the control of the neutral point potential of the variation carried out for suppressing neutral point voltage.
In the past, in the neutral point voltage of Neutral Point Clamped PWM inverter device as constituted above controls, use the modulation of bipolar modulation, unipolarity as pwm pulse production method, by the increase and decrease of voltage instruction, control flow check is to the electric current of the neutral line.
China Patent Publication No. CN 100334801C, publication date on August 29th, 2007, the name of innovation and creation is called Neutral Point Clamped pulse width modulation inverter device, this application case discloses according to positive bus-bar, negative busbar and the neutral line respectively with the calculated value of the time of 3 phase output voltages of the phase output terminal sub-connection of 3 phases and in this condition described in first long-pending calculated value of neutral point predicted current value, be in the phase output terminals of 3 phases 2 connect with positive bus-bar or the neutral line and remaining 1 with the calculated value of time of 3 phase output voltages of the described neutral line or negative busbar tie point state 1 and contrary state 2 and second and third calculated value amassed of the described neutral line predicted current value in this state 1 and 2, determine the time ratio of the state 1 and 2 in the PWM cycle, make the electric current flowing to the neutral line close to zero, or make the current potential of the neutral line of 3 phase output voltages close to the voltage of the middle of positive bus-bar voltage and negative busbar voltage.Its weak point be in the controlling property line current time, adopt the method for the ratio changing voltage vector, be identical with common-mode voltage with the line voltage of the output of two level PWM inverters by causing the line voltage of output and part common-mode voltage partial deterioration, not only bring the complexity in control, and more harmonic wave and stronger electromagnetic interference can be produced.
Summary of the invention
The object of the present invention is to provide a kind of three-phase Neutral Point Clamped PWM inverter device, the variation of neutral point voltage can be suppressed expeditiously, and three-phase Neutral Point Clamped PWM inverter device can according to normal switching signal Schema control, without the need to for suppressing neutral point voltage fluctuation to change voltage vector ratio.
To achieve these goals, technical scheme of the present invention is to provide a kind of three-phase Neutral Point Clamped PWM inverter device, this three-phase Neutral Point Clamped PWM inverter device is made up of two partial devices, Part I device is three-phase Neutral Point Clamped PWM inverter device, Part II device is the device suppressing neutral point voltage skew, and described Part II device is connected by the neutral point of series inductance with described Part I device.Wherein said three-phase Neutral Point Clamped PWM inverter device has positive bus-bar, negative busbar and the neutral line, 3 are divided into be provided with Neutral Point Clamped PWM inverter mutually, each Neutral Point Clamped PWM inverter is at positive bus-bar and phase output terminals and be connected in series first and second switch element and the third and fourth switch element between negative busbar and phase output terminals respectively, and described first is connected with described neutral point via clamp members with the tie point of the 4th described switch element respectively with the tie point and the described the 3rd of described second switch element, first capacitor and second capacitor is connected in series respectively between described positive bus-bar and described neutral point and between described negative busbar and described neutral point, the device of wherein said suppression neutral point voltage skew has positive bus-bar, negative busbar and the neutral line, to connect respectively between described positive bus-bar and described neutral point and between described negative busbar and described neutral point the 5th switch element and the 6th switch element, the 5th described switch element and the 6th switch element fly-wheel diode in parallel respectively, and the described the 5th switch element and the described the 6th switch element intermediate point and described three-phase Neutral Point Clamped PWM inverter device are connected in series by an inductor.
This device can when the neutral point voltage of described three-phase Neutral Point Clamped PWM inverter device be less than the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential, the 5th described switch element can be opened, the 6th switch element described in closedown, described neutral point voltage is raised, makes the current potential of the described neutral line close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential; When the neutral point voltage of described three-phase Neutral Point Clamped PWM inverter device is greater than the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential, the 5th described switch element can be closed, open the 6th described switch element, described neutral point voltage is reduced, makes the current potential of the described neutral line close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential.
This device can also can open the 6th described switch element when the neutral point of the three-phase Neutral Point Clamped PWM inverter device described in electric current flows into, the 5th switch element described in closedown, electric current is extracted to described neutral point, when the three-phase Neutral Point Clamped PWM inverter device described in outflow of bus current neutral point constantly, the 5th described switch element can be opened, the 6th switch element described in closedown, to described neutral point Injection Current.
This device can also when the power supply of three-phase Neutral Point Clamped three-level pwm DC-to-AC converter be rectification input, between the positive bus-bar described in the positive bus-bar described in described suppression neutral point voltage offset assembly and described three-phase Neutral Point Clamped PWM inverter, be connected in series a diode, between the positive bus-bar described in described suppression neutral point voltage offset assembly and external power supply positive potential, be connected in series an inductance.
By above-mentioned way, can in guarantee PWM inverter under normal switching signal Schema control, neutral point potential is changed as far as possible close to zero, or by making the current potential of the neutral line close to the current potential of the middle between positive bus-bar and negative busbar voltage, can neutral point potential be efficiently suppressed to change, therefore can improve fail safe, improve the quality of output voltage.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the main circuit structure representing tri-level inversion apparatus.
Fig. 2 is the circuit diagram of the main circuit structure represented with the tri-level inversion apparatus suppressing neutral point current offset assembly.
Fig. 3 is the output voltage space vector figure of three-phase Neutral Point Clamped PWM converting means.
Fig. 4 is small vector output example figure in the on off state group representing three-phase Neutral Point Clamped inverter.
Fig. 5 be in the on off state group representing three-phase Neutral Point Clamped inverter in vector output example figure.
Fig. 6 is the circuit diagram of the main circuit structure of the tri-level inversion apparatus of the suppression neutral point current offset assembly represented with three brachium pontis.
Fig. 7 is can the circuit diagram of main circuit structure of three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage when representing that power supply is rectification input.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Embodiment 1
It is the circuit diagram of the main circuit structure of the tri-level inversion apparatus with suppression neutral point current offset assembly representing the present embodiment as Fig. 2.As shown in Figure 2, this example is made up of two partial devices, Part I device is three-phase Neutral Point Clamped three-level pwm DC-to-AC converter, Part II device is the device of active balancing neutral point clamp voltage, the device of active balancing neutral point clamp voltage is connected high frequency switching elements 1 between positive bus-bar and the neutral line, to connect between the neutral line and negative busbar high frequency switching elements 2, and 2 high frequency switching elements fly-wheel diodes 3 in parallel, series inductance 4 between 2 high frequency switching elements and the neutral point c of three-phase Neutral Point Clamped three-level pwm DC-to-AC converter.
Fig. 3 is the output voltage space vector figure of three-phase Neutral Point Clamped PWM converting means, comprising 27 output voltage vector, small vector (ap can be divided into according to the mould length of vector, an and bp, bn), middle vector (c), large vector (a and b) and zero vector (op, oo and on), three dimensional vector diagram is divided into A ~ F 6 Ge great district, each great Qu can be divided into again 4 little delta-shaped regions.When to be in a region, 24 shown in Fig. 3 some for the output voltage of PWM converting means, can substitute with the voltage vector in this region of composition.
When three-phase Neutral Point Clamped three-level pwm DC-to-AC converter output voltage vector is positioned at A1 ~ F1 region, output voltage vector can by voltage vector: ap, an, bp, bn, op, oo and on replace.Two is contrary on redundant vectors ap and an and bp and the impact of bn voltage to neutral as seen from Figure 4, in a carrier cycle, chooses ap and an of same widths, bp and the bn of same widths.Wherein zero vector op, oo and on centering point current potential does not affect.
When three-phase Neutral Point Clamped three-level pwm DC-to-AC converter output voltage vector is positioned at A2 ~ F2 region, output voltage vector can by voltage vector: ap, an, a and c replace.It is contrary for being affected by Fig. 4 redundant vectors ap and an voltage to neutral, chooses ap and an of same widths in a carrier cycle; For c vector, as shown in Figure 5, there is no the vector of redundancy, if when c vector makes neutral point potential be less than the current potential V0 of the middle between positive bus-bar current potential and negative busbar current potential, the switch element 1 of the device of the active balancing neutral point clamp voltage shown in Fig. 2 can be opened, turn off the device switch element 2 of active balancing neutral point clamp voltage, neutral point potential is raised; If when neutral point potential is greater than V0, the switch element 1 of the device of active balancing neutral point clamp voltage can be turned off, open the switch element 2 of the device of active balancing neutral point clamp voltage; Wherein large vector a centering point current potential does not affect.
When three-phase Neutral Point Clamped three-level pwm DC-to-AC converter output voltage vector is positioned at A4 ~ F4 region, output voltage vector can by voltage vector: bp, bn, b and c replace.It is contrary for being affected by Fig. 4 redundant vectors bp and bn voltage to neutral, chooses bp and the bn of same widths in a carrier cycle; For c vector, as shown in Figure 5, there is no the vector of redundancy, if when c vector makes neutral point potential be less than V0, the switch element 1 of the device of the active balancing neutral point clamp voltage shown in Fig. 2 can be opened, turn off the switch element 2 of the device of active balancing neutral point clamp voltage, neutral point potential is raised; If when neutral point potential is greater than V0, the switch element 1 of the device of active balancing neutral point clamp voltage can be turned off, open the switch element 2 of the device of active balancing neutral point clamp voltage; Wherein large vector b centering point current potential does not affect.
When three-phase Neutral Point Clamped three-level pwm DC-to-AC converter output voltage vector is positioned at A3 ~ F3 region, output voltage vector can by voltage vector: ap, an, bp, bn and c replace.Two is contrary on redundant vectors ap and an and bp and the impact of bn voltage to neutral as seen from Figure 4, in a carrier cycle, chooses ap and an of same widths, bp and the bn of same widths; For c vector, as shown in Figure 5, redundant vectors is not had, if c vector makes neutral point potential be less than V0, the switch element 1 of the device of the active balancing neutral point clamp voltage shown in Fig. 2 can be opened, turn off the switch element 2 of the device of active balancing neutral point clamp voltage, neutral point potential is raised; If when neutral point potential is greater than V0, the switch element 1 of the device of active balancing neutral point clamp voltage can be turned off, open the switch element 2 of the device of active balancing neutral point clamp voltage; Wherein large vector a centering point current potential does not affect.
Embodiment 2
Secondly, with reference to Fig. 6 embodiments of the invention 2 are described can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage.Fig. 6 be represent embodiments of the invention 2 can the circuit diagram of main circuit structure of three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage.The present embodiment can the three-level three-phase electric power conversion apparatus difference of active balancing neutral point clamp voltage being of the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage and above-described embodiment: the device being connected to the active balancing neutral point clamp voltage on 3 described in example between positive bus-bar and negative busbar, and the device of each active balancing neutral point clamp voltage connects respectively by series inductance 4 between 2 high frequency switching elements and the neutral point c of three-phase Neutral Point Clamped three-level pwm DC-to-AC converter.When the output voltage vector of alternative three-phase Neutral Point Clamped three-level pwm DC-to-AC converter comprises c vector, controlling neutral point potential rising or reducing is completed by the device of described three active balancing neutral point clamp voltages.
Embodiment 3
Illustrate that another one of the present invention can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage.Fig. 7 be represent the present embodiment can the circuit diagram of main circuit structure of three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage.The present embodiment can the three-level three-phase electric power conversion apparatus difference of active balancing neutral point clamp voltage being of the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage and above-described embodiment: the power supply of three-phase Neutral Point Clamped three-level pwm DC-to-AC converter be rectification input time, be connected in series a diode between the positive bus-bar of the device of active balancing neutral point clamp voltage and the positive bus-bar of three-phase Neutral Point Clamped three-level pwm DC-to-AC converter; An inductance is connected in series between the positive bus-bar power supply positive potential of the device of active balancing neutral point clamp voltage.When the output voltage vector of alternative three-phase Neutral Point Clamped three-level pwm DC-to-AC converter comprises c vector, the device of active balancing neutral point clamp voltage controls neutral point potential and raises or reduce, switch element 1 and 2 has a conducting at least, and now power supply is to induction charging; When the output voltage vector of alternative three-phase Neutral Point Clamped three-level pwm DC-to-AC converter does not comprise c vector, instantaneous value according to rectifier output voltage is opened simultaneously or turns off, for inductive energy storage or to 2 capacitor chargings, keep DC voltage substantially constant.
Claims (2)
1. one kind can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage, this three-level three-phase electric power conversion apparatus has positive bus-bar, negative busbar, the neutral line, is connected in series the first capacitor and the second capacitor between described positive bus-bar and the described neutral line and between described negative busbar and the described neutral line respectively; The first switch element and second switch element is sequentially connected in series between described positive bus-bar and described negative busbar line, the first described switch element and second switch element fly-wheel diode in parallel respectively, the first described switch element is connected by inductor with the described neutral line with the intermediate point of described second switch element; And be provided with 3 phase Neutral Point Clamped PWM inverter, this 3 phase Neutral Point Clamped PWM inverter every 1 at described positive bus-bar and phase output terminals and be connected in series the third and fourth switch element and the 5th and the 6th switch element between described negative busbar and phase output terminals respectively, and the described the 3rd is connected with the described neutral line respectively by clamp members with the tie point of the 6th described switch element with the tie point and the described the 5th of the 4th described switch element;
This three-level three-phase electric power conversion apparatus, is characterized in that possessing:
Under the first state that in the PWM cycle, the described phase output terminals of 3 phases is connected with described positive bus-bar, described negative busbar, the described neutral line respectively, according to the first difference value of the current potential of the described neutral line current potential predicted and the middle between described positive bus-bar current potential and described negative busbar current potential, the switch motion controlling described first switch element and described second switch element meets following neutral point clamp voltage balance rule: when the first described difference value is zero, close described first switch element and described second switch element; When described first difference value is timing, close described first switch element and make described second switch element do switch motion, making described neutral line current potential close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential; When described first difference value is for time negative, closes described second switch element and make described first switch element do switch motion, making described neutral line current potential close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential;
In the PWM cycle 3 phases described phase output terminals in 2 to be connected with described positive bus-bar and time under remaining 1 the second state be connected with the described neutral line, equal in the described phase output terminals of 3 phases in the PWM cycle 2 and be connected with the described neutral line and time under remaining 1 third state be connected with described negative busbar;
In the PWM cycle 3 phases described phase output terminals in 1 to be connected with described positive bus-bar and time under remaining 2 the 4th states be connected with the described neutral line, equal in the described phase output terminals of 3 phases in the PWM cycle 1 and be connected with the described neutral line and time under remaining 2 the 5th states be connected with described negative busbar.
2. one kind can the three-level three-phase electric power conversion apparatus of active balancing neutral point clamp voltage, this three-level three-phase electric power conversion apparatus has positive bus-bar, negative busbar, the neutral line, is connected in series the first capacitor and the second capacitor between described positive bus-bar and the described neutral line and between described negative busbar and the described neutral line respectively; The first switch element and second switch element is sequentially connected in series between described positive bus-bar and described negative busbar line, the first described switch element and second switch element fly-wheel diode in parallel respectively, the first described switch element is connected by inductor with the described neutral line with the intermediate point of described second switch element; And be provided with 3 phase Neutral Point Clamped PWM inverter, this 3 phase Neutral Point Clamped PWM inverter every 1 at described positive bus-bar and phase output terminals and be connected in series the third and fourth switch element and the 5th and the 6th switch element between described negative busbar and phase output terminals respectively, and the described the 3rd is connected with the described neutral line respectively by clamp members with the tie point of the 6th described switch element with the tie point and the described the 5th of the 4th described switch element;
This three-level three-phase electric power conversion apparatus, is characterized in that possessing:
Under the first state that in the PWM cycle, the described phase output terminals of 3 phases is connected with described positive bus-bar, described negative busbar, the described neutral line respectively, according to the inflow predicted or the direction of flowing out described neutral current, the switch motion controlling described first switch element and described second switch element meets following neutral point clamp voltage balance rule: when predicting both no currents and flowing into that also no current flows out the described neutral line, close described first switch element and described second switch element; When predicting electric current and flowing into the described neutral line, close described first switch element and make described second switch element do switch motion, extract electric current to the described neutral line, make described neutral line current potential close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential; When predicting the neutral line described in outflow of bus current, close described second switch element and make described first switch element do switch motion, to described neutral line Injection Current, make described neutral line current potential close to the current potential of the middle between described positive bus-bar current potential and described negative busbar current potential;
In the PWM cycle 3 phases described phase output terminals in 2 to be connected with described positive bus-bar and time under remaining 1 the second state be connected with the described neutral line, equal in the described phase output terminals of 3 phases in the PWM cycle 2 and be connected with the described neutral line and time under remaining 1 third state be connected with described negative busbar;
In the PWM cycle 3 phases described phase output terminals in 1 to be connected with described positive bus-bar and time under remaining 2 the 4th states be connected with the described neutral line, equal in the described phase output terminals of 3 phases in the PWM cycle 1 and be connected with the described neutral line and time under remaining 2 the 5th states be connected with described negative busbar.
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| CN102969881B (en) * | 2012-11-30 | 2016-01-06 | 深圳市英威腾电气股份有限公司 | A kind of voltage equalizing protection circuit and diode clamp many level topology apparatus |
| SE539852C2 (en) * | 2012-12-19 | 2017-12-19 | Comsys Ab | Symmetric circuit |
| CN106664009A (en) * | 2014-08-08 | 2017-05-10 | 奥的斯电梯公司 | Neutral point regulator hardware for a multi-level drive |
| DE102014224371A1 (en) * | 2014-11-28 | 2016-06-02 | Robert Bosch Gmbh | Battery system with a hybrid battery and an NPC inverter connected to the battery on the input side and method for operating an NPC inverter connected on the input side with a hybrid battery |
| CN104779826B (en) * | 2015-04-03 | 2017-08-25 | 西安理工大学 | The common-mode voltage suppressing method of the T-shaped three-level photovoltaic grid-connected inverter of non-isolated |
| CN104967342B (en) * | 2015-06-03 | 2017-08-01 | 厦门理工学院 | The midpoint potential forecast Control Algorithm of diode-clamped three-level converter |
| CN109120175B (en) * | 2018-10-15 | 2020-03-24 | 阳光电源股份有限公司 | Modulation method and device of three-level balance bridge circuit |
| CN110912435A (en) * | 2019-11-15 | 2020-03-24 | 中南大学 | Neutral point voltage balance control method of three-level inverter |
| CN114070112B (en) * | 2021-11-16 | 2023-09-05 | 中南大学 | Neutral point potential fast balance control method of three-level inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6490185B1 (en) * | 1999-08-12 | 2002-12-03 | Kabushiki Kaisha Yaskawa Denki | Method for controlling neutral point potential of inverter of neutral point clamping type |
| CN102222921A (en) * | 2011-06-08 | 2011-10-19 | 湖南大学 | Capacitor clamping-based trilevel railway power regulator |
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| JP2002199738A (en) * | 2000-12-22 | 2002-07-12 | Fuji Electric Co Ltd | Multi-level inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6490185B1 (en) * | 1999-08-12 | 2002-12-03 | Kabushiki Kaisha Yaskawa Denki | Method for controlling neutral point potential of inverter of neutral point clamping type |
| CN102222921A (en) * | 2011-06-08 | 2011-10-19 | 湖南大学 | Capacitor clamping-based trilevel railway power regulator |
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