CN202841000U - Apparatus suppressing deviation of neutral point voltage in three-level inverter - Google Patents
Apparatus suppressing deviation of neutral point voltage in three-level inverter Download PDFInfo
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- CN202841000U CN202841000U CN 201220448570 CN201220448570U CN202841000U CN 202841000 U CN202841000 U CN 202841000U CN 201220448570 CN201220448570 CN 201220448570 CN 201220448570 U CN201220448570 U CN 201220448570U CN 202841000 U CN202841000 U CN 202841000U
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Abstract
The utility model relates to an apparatus suppressing deviation of the neutral point voltage in a three-level inverter, which is suitable for the power electronic field. The apparatus comprises a three-level inverter, a voltage acquisition unit, a proportional integration control unit, a pulse width control unit and a voltage adjusting unit. According to the neutral point voltage balance apparatus provided in the utility model, the bus capacitances and voltages up and down are detected in real time, the detected data is processed by the proportional integration controller to generate controlled quantities, and the pulse width modulation duty ratio of the power tube of the voltage adjusting unit is adjusted according to the controlled quantities. According to the utility model, the apparatus suppressing deviation of the neutral point voltage in a three-level inverter is advantageous in that the structure is simple, control realization is simple, the control effect is independent of the modulation ratio and power factor of the inversion system, and the neutral point voltage is controlled in a small scope.
Description
Technical field
The utility model belongs to field of power electronics, relates to a kind of inhibition three-level inverter mid-point potential offset device.
Background technology
Three-level inverter has compact conformation, and the output voltage current harmonic content is low, and the voltage that switching tube bears only is the 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, namely has the mid-point voltage imbalance problem.The mid-point voltage imbalance can cause serious harm: inverter output voltage waveform distorted; The voltage that switching device bears is unbalanced; The voltage fluctuation of dc bus capacitor has reduced the life-span of electric capacity.For inverter can be worked, should make great efforts so that mid-point voltage keeps balance.
The method that suppresses mid-point potential offset has hardware and software two large classes.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 device of the skew that can establishment three-level inverter midpoint potential that combines from hardware and software two aspects in this area urgently.
The utility model content
The utility model provides a kind of inhibition three-level inverter mid-point potential offset device, 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 utility model is achieved through the following technical solutions, a kind of three-level inverter midpoint potential balance control device, described device, the midpoint potential balance that is used for the control three-level inverter, this device comprises: three-level inverter, voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage-regulation unit, wherein:
Voltage acquisition unit is used for obtaining on the bus capacitance voltage under the capacitance voltage and bus, and described voltage acquisition unit input is connected with bus and the bus mid point terminal of three-level inverter;
The proportional plus integral control unit is used for the poor proportional integral that carries out of capacitance voltage under capacitance voltage on the bus and the bus is processed, and the input of described 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 described pulse width control unit is connected with the output of proportional plus integral control unit;
The voltage-regulation unit is used for regulating up and down capacitance voltage of bus according to pulse-width signal, so that the midpoint potential balance, the input of described voltage-regulation unit is connected with the output of pulse width control unit.
Especially, described 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 described 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 described kernel control module is connected with the output of computing module, and the output of described kernel control module is the output of proportional plus integral control unit.
Especially, described pulse width control unit further comprises:
The fine setting module is used for judging that unbalance of neutral-point voltage amount size determines whether Comparative Examples integral control amount reduces by half to reach capacitance voltage about the bus is finely tuned, and described fine setting module input is connected with proportional plus integral control unit output;
Modulation module is used for the pulse-width signal according to the living two-way complementation of proportional plus integral control volume production, and the input of described modulation module is connected with the output of fine setting module, and the modulation module output is the output of pulse width control unit.
Especially, described 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.
Especially, described device utilizes the pulse-width signal of two-way complementation to control respectively two switching tubes in the voltage-regulation unit.
Especially, described voltage-regulation unit specifically comprises: as first electric capacity both end voltage+BUS during greater than the second electric capacity both end voltage-BUS, the modulation signal pulsewidth that increases control the first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity both end voltage+BUS during less than the second electric capacity both end voltage-BUS, the modulation signal pulsewidth that reduces to control the first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
The utility model suppresses the three-level inverter mid-point potential offset by the mode of taking software and hardware to combine, and structure and control are all fairly simple, has improved the stability of three-level inverter.
Description of drawings
Fig. 1 is the described inhibition three-level inverter of embodiment mid-point potential offset system structure of device block diagram;
Fig. 2 is the described proportional plus integral control unit module of embodiment block diagram;
Fig. 3 is the described pulse width control unit module frame chart of embodiment;
Fig. 4 is the described voltage-regulation element circuit of the utility model preferred embodiment schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and implementation example the utility model is further specified.
Fig. 1 is the described inhibition three-level inverter of the present embodiment mid-point potential offset system structure of device block diagram, as shown in Figure 1, three-level inverter neutral balance control device described in the utility model comprises: three-level inverter (not shown), 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 is used for obtaining on the bus capacitance voltage under the capacitance voltage and bus, and described voltage acquisition unit input is connected with bus and the bus mid point terminal of three-level inverter;
Proportional plus integral control unit 102 is used for the poor proportional integral that carries out of capacitance voltage under capacitance voltage on the bus and the bus is processed, and the input of described proportional plus integral control unit 102 is connected with the output of voltage acquisition unit 101;
Pulse width control unit 103, for generation of pulse-width signal, the input of described pulse width control unit is connected with the output of proportional plus integral control unit 102;
Voltage-regulation unit 104, capacitance voltage makes the midpoint potential balance about being used for regulating bus, and the input of described voltage-regulation unit 104 is connected with the output of pulse width control unit 103.
Fig. 2 is the described proportional plus integral control unit module of embodiment block diagram, and as shown in Figure 2, described 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 described kernel control module 202 is connected with the output of computing module 201, and the output of described kernel control module 202 is the output of proportional plus integral control unit 102.
Fig. 3 is the described pulse width control unit module frame chart of embodiment, and as shown in Figure 3, described pulse width control unit 103 further comprises:
The operation principle of each unit, module is as follows in the described three-level inverter neutral balance of Fig. 1-3 control device:
S1, voltage acquisition unit obtain on the bus capacitance voltage under the capacitance voltage and bus;
S2, proportional plus integral control unit are processed the poor proportional integral that carries out of capacitance voltage under capacitance voltage on the bus and the bus;
Further, described proportional plus integral control unit is by calculating three-level inverter unbalance of neutral-point voltage amount, and the alignment voltage deviation carries out proportional integral to be processed, 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 for control voltage-regulation unit;
Further, described pulse width control unit by judge unbalance of neutral-point voltage amount size whether determine Comparative Examples integral control amount reduce by half to reach to bus up and down capacitance voltage finely tune, and give birth to the pulse-width signal of two-way complementation according to the proportional plus integral control volume production.
Up and down capacitance voltage of bus is 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. 4 the utility model is made and to be further specified.
Fig. 4 is voltage-regulation described in the utility model unit 104 circuit theory diagrams, and as shown in Figure 4, described voltage-regulation unit 104 comprises: two power switch pipe Q1, Q2, two diode D1, D2, an 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, in the utility model, voltage acquisition unit 101 collection capacitor C 1 both end voltage+BUS and capacitor C 2 both end voltage-BUS(are as shown in Figure 4).
The input of proportional plus integral control unit 102 is connected with voltage acquisition unit 101 outputs, the difference of capacitor C 1, C2 both end 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 pulse-width signal of output two-way complementation according to the proportional plus integral control volume production, control described voltage-regulation unit 104.
Further, shown in Fig. 4, the pulse-width signal of two-way complementation is controlled respectively two switching tube Q1, the Q2 in the voltage-regulation unit 104, as capacitor C 1 both end voltage+BUS during greater than capacitor C 2 both end 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 both end voltage+BUS during less than capacitor C 2 both end 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 by 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; As positive bus-bar voltage+BUS during less than negative busbar voltage-BUS, switching tube Q2 opens, switching tube Q1 turn-offs, and capacitor C 2 shifts energy to inductance L; When switching tube Q2 shutoff, when switching tube Q1 opens, electric current is by 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 energy establishment three-level inverter mid-point potential offset that the utility model takes software and hardware to combine, structure and control are all fairly simple, have improved the stability of three-level inverter.
It below only is the explanation of doing for specific embodiment of the utility model and know-why thereof; and be not the restriction that technology contents of the present utility model is carried out; anyly be familiar with those skilled in the art in technical scope disclosed in the utility model; the variation of easily being expected or replacement all should be encompassed in the protection range of the present utility model.
Claims (6)
1. one kind is suppressed three-level inverter mid-point potential offset device, be used for suppressing the mid-point potential offset of three-level inverter, it is characterized in that, this device comprises: three-level inverter, voltage acquisition unit, proportional plus integral control unit, pulse width control unit and voltage-regulation unit, wherein:
Voltage acquisition unit is used for obtaining on the bus capacitance voltage under the capacitance voltage and bus, and described voltage acquisition unit input is connected with bus and the bus mid point terminal of three-level inverter;
The proportional plus integral control unit is used for the poor proportional integral that carries out of capacitance voltage under capacitance voltage on the bus and the bus is processed, and the input of described 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 described pulse width control unit is connected with the output of proportional plus integral control unit;
The voltage-regulation unit is used for regulating up and down capacitance voltage of bus according to pulse-width signal, so that the midpoint potential balance, the input of described voltage-regulation unit is connected with the output of pulse width control unit.
2. device as claimed in claim 1, it is characterized in that: described 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 described 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 described kernel control module is connected with the output of computing module, and the output of described kernel control module is the output of proportional plus integral control unit.
3. device as claimed in claim 1, it is characterized in that: described pulse width control unit further comprises:
The fine setting module is used for judging that unbalance of neutral-point voltage amount size determines whether Comparative Examples integral control amount reduces by half to reach capacitance voltage about the bus is finely tuned, and described fine setting module input is connected with proportional plus integral control unit output;
Modulation module is used for the pulse-width signal according to the living two-way complementation of proportional plus integral control volume production, and the input of described 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, it is characterized in that: described 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. such as the described device of one of claim 1-4, it is characterized in that:
Described device utilizes the pulse-width signal of two-way complementation to control respectively two switching tubes in the voltage-regulation unit.
6. device as claimed in claim 5 is characterized in that:
Described voltage-regulation unit specifically comprises: as first electric capacity both end voltage+BUS during greater than the second electric capacity both end voltage-BUS, the modulation signal pulsewidth that increases control the first switching tube reduces to control the pulsewidth of the modulation signal of second switch pipe simultaneously; As first electric capacity both end voltage+BUS during less than the second electric capacity both end voltage-BUS, the modulation signal pulsewidth that reduces to control the first switching tube increases the modulation signal pulsewidth of control second switch pipe simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220448570 CN202841000U (en) | 2012-09-04 | 2012-09-04 | Apparatus suppressing deviation of neutral point voltage in three-level inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220448570 CN202841000U (en) | 2012-09-04 | 2012-09-04 | Apparatus suppressing deviation of neutral point voltage in three-level inverter |
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| CN202841000U true CN202841000U (en) | 2013-03-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843055A (en) * | 2012-09-04 | 2012-12-26 | 江苏中航动力控制有限公司 | Neutral-point potential balance control device and method for three-level inverter |
| 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 |
| CN106664009A (en) * | 2014-08-08 | 2017-05-10 | 奥的斯电梯公司 | Neutral point regulator hardware for a multi-level drive |
| CN107040155A (en) * | 2015-07-27 | 2017-08-11 | 中兴通讯股份有限公司 | The adjusting method of pulse, device and multi-level converter in multi-level converter |
| CN107482884A (en) * | 2017-09-20 | 2017-12-15 | 江苏兆能电子有限公司 | One kind input Pressure and Control circuit |
| CN109617423A (en) * | 2018-10-25 | 2019-04-12 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | High-power extremely low frequency power and its subharmonic inhibit device |
-
2012
- 2012-09-04 CN CN 201220448570 patent/CN202841000U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843055A (en) * | 2012-09-04 | 2012-12-26 | 江苏中航动力控制有限公司 | Neutral-point potential balance control device and method for three-level inverter |
| CN102843055B (en) * | 2012-09-04 | 2016-07-06 | 江苏中航动力控制有限公司 | A kind of three-level inverter neutral-point-potential balance control device and method |
| 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 |
| CN106664009A (en) * | 2014-08-08 | 2017-05-10 | 奥的斯电梯公司 | Neutral point regulator hardware for a multi-level drive |
| CN107040155A (en) * | 2015-07-27 | 2017-08-11 | 中兴通讯股份有限公司 | The adjusting method of pulse, device and multi-level converter in multi-level converter |
| CN107482884A (en) * | 2017-09-20 | 2017-12-15 | 江苏兆能电子有限公司 | One kind input Pressure and Control circuit |
| CN109617423A (en) * | 2018-10-25 | 2019-04-12 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | High-power extremely low frequency power and its subharmonic inhibit device |
| CN109617423B (en) * | 2018-10-25 | 2019-12-31 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | High-power extremely-low-frequency power supply and secondary harmonic suppression device |
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Granted publication date: 20130327 Effective date of abandoning: 20160706 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |