CN104601026A - Suspended capacitor voltage control method of five-level ANPC (Active Neutral-Point-Clamped) converter - Google Patents
Suspended capacitor voltage control method of five-level ANPC (Active Neutral-Point-Clamped) converter Download PDFInfo
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- CN104601026A CN104601026A CN201410810131.6A CN201410810131A CN104601026A CN 104601026 A CN104601026 A CN 104601026A CN 201410810131 A CN201410810131 A CN 201410810131A CN 104601026 A CN104601026 A CN 104601026A
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- level
- flying capacitor
- capacitor voltage
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- level anpc
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a five-level ANPC (Active Neutral-Point-Clamped) converter, particularly to a suspended capacitor voltage control method of the five-level ANPC converter. The suspended capacitor voltage control method comprises the following steps of applying SHEPWM (Selective Harmonic Elimination Pulse Width Modulation) pulse waves to the five-level ANPC converter; performing real-time detection on a suspended capacitor voltage value of the five-level ANPC converter, performing comparison on the suspended capacitor voltage value and a reference value of the suspended capacitor voltage and determining whether a suspended capacitor needs to be charged or discharged; detecting whether the load current of the five-level ANPC converter is positive or negative and selecting the redundancy switch state which is suitable for the ANPC converter according to the positive or negative load current of the five-level ANPC converter and the determined charging and discharging state required by the suspended capacitor; performing charging and discharging on the suspended capacitor of the five-level ANPC converter through the selected switch state until that the variable quantity of the suspended capacitor voltage is zero within a sampling period and performing repeated detection on the suspended capacitor voltage value. According to the suspended capacitor voltage control method of the five-level ANPC converter, the appropriate redundancy switch state is selected according to the direction of the load current and the size of the suspended capacitor voltage so as to enable the suspended capacitor voltage to be fluctuated within a small range.
Description
Technical field
The present invention relates to a kind of five level ANPC converters, particularly a kind of five level ANPC converter flying capacitor voltage control methods.
Background technology
Along with progress and the growth in the living standard of science and technology, people to the requirement of the quality of power supply also in continuous lifting, active neutral-point-clamped (active neutral-point-clamped, ANPC) appearance of topology compensate for the shortcoming of diode clamp type topological sum capacitor pincers bit-type topology, is better applicable to the high-pressure frequency-conversion field of 6 and 10kV.ANPC multi-level converter to get more and more by use with industry with the field such as social life to provide the electric energy of more high-quality, and at present, selection in domestic SHEPWM modulator approach acts on five level ANPC converters and there is not yet periodical.Select SHEPWM to control, effectively can reduce the low-order harmonic under high frequency, improve waveform quality, also reduce the requirement to filter.Five level and above ANPC topology one of the prerequisite that can normally work is that flying capacitor voltage must keep stable, when SHEPWM controls, if do not consider this key issue of flying capacitor voltage, if the SHEPWM on off state obtained makes flying capacitor voltage that larger fluctuation occur, practical significance will be lost.
Summary of the invention
The technical issues that need to address of the present invention are to provide the control method keeping flying capacitor voltage stabilization when a kind of SHEPWM modulates five level ANPC converters.
For solving above-mentioned technical problem, five level ANPC converter flying capacitor voltage control methods of the present invention, comprise the following steps:
Step S101: determine the switch angle needing to arrange according to the modulation degree m of SHEPWM, determines that the three-phase that SHEPWM modulates exports, and exports three-phase five level SHEPWM impulse wave and acts on five level ANPC converters;
Step S102: the magnitude of voltage detecting five level ANPC converter flying capacitor voltages in real time, and compare with the reference value of flying capacitor voltage, determine that flying capacitor needs charging or electric discharge;
Step S103: detect the positive and negative of five level ANPC converter load currents, the flying capacitor determined in the positive and negative and step S102 according to ANPC converter load current needs charging and discharging state to select the Redundanter schalter state of suitable ANPC converter;
Step S104: carry out discharge and recharge by the on off state selected to five level ANPC converter flying capacitors, until within a sampling period, the variable quantity of flying capacitor voltage is 0, returns step S102.
Further, the electric current flowing through flying capacitor in described step S104 can be expressed as I
cf=I
s3-I
s1, the electric current flowing through each switching tube can be expressed as I
si=X
ii
load, wherein X
irepresent the on off state of each switching tube, as switching tube S
iduring conducting, X
ivalue be 1, as switching tube S
iduring shutoff, X
ivalue be 0; I
cf=(X
3-X
1) I
load, within a sampling period, the variable quantity of flying capacitor voltage is
Further, in described step S101, five level SHEPWM impulse waves act on five level ANPC converters and export 5 level and be respectively 2E, E, and 0 ,-E and-2E.
Further, in step S102, when detecting that intermediate level E or-E arrives, mark position 1, starts Logic judgment, when the flying capacitor magnitude of voltage detected in real time is greater than reference voltage level E, then selects to discharge to flying capacitor at every turn; Otherwise, when the flying capacitor magnitude of voltage detected in real time is less than reference voltage level E, then select to charge to flying capacitor.
Further, in step S103, load current is to flow to the direction of load for positive direction from the single-phase brachium pontis of five level ANPC converters, and load current is just, otherwise is negative.
Further, according to needing the suitable Redundanter schalter state of the positive and negative selection of flying capacitor charging and discharging state and load current in step S102, after selecting suitable Redundanter schalter state, mark position 0.
After adopting said method, five level ANPC converters effectively can suppress low-order harmonic in whole working range, and obtain good output waveform, the method dynamic property is better, in ideal steady-state situation, can control flying capacitor voltage one very among a small circle in fluctuation.Under current intelligence, also can select suitable Redundanter schalter state according to the direction of load current with the size of flying capacitor voltage, make flying capacitor voltage maintain fluctuation in a very little scope.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the single-phase topological structure of the present invention five level ANPC converter.
Fig. 2 is the flow chart of the present invention five level ANPC converter flying capacitor voltage control method
Fig. 3 is the Logic judgment schematic diagram of the present invention five level ANPC converter flying capacitor voltage control method.
Fig. 4 is that Logic judgment selects suitable Redundanter schalter state principle figure.
Fig. 5 is the present invention five level ANPC converter switches state table.
Embodiment
SHEPWM controls to be arrange " breach " in the specific position of voltage waveform, by the optimum choice of switching time, controls pwm voltage waveform rightly, there is not some specific times harmonic in the voltage that converter can be made to export.SHEPWM can eliminate certain low-order harmonic when high switching frequency, and remaining high order harmonic component then carrys out elimination easily via the design of filter.Select SHEPWM to control, effectively can reduce the low-order harmonic under high frequency, improve waveform quality, also reduce the requirement to filter.Five level ANPC converter output waveform quality are better, can better be applied to the occasions such as Electric Machine Control, power electronics and utility power quality control, and modulation focus on flying capacitor voltage can be made to keep balance.
As shown in Figures 2 and 3, the control method of a kind of five level ANPC converter SHEPWM of the present invention and flying capacitor voltage, comprises the following steps:
Step S101: determine the switch angle needing to arrange according to the modulation degree m of SHEPWM, determines that the three-phase that SHEPWM modulates exports, and exports three-phase five level SHEPWM impulse wave and acts on five level ANPC converters.Wherein the single-phase topological diagram of five level ANPC converters as shown in Figure 1, and visible five level ANPC converters comprise three electric capacity, and comprising a flying capacitor, the electric current flowing through flying capacitor can be expressed as I
cf=I
s3-I
s1, the electric current flowing through each switching tube can be expressed as I
si=X
ii
load, wherein X
irepresent the on off state of each switching tube, as switching tube S
iduring conducting, X
ivalue be 1, as switching tube S
iduring shutoff, X
ivalue be 0; I
cf=(X
3-X
1) I
load, within a sampling period, the variable quantity of flying capacitor voltage is
five level SHEPWM ripples act on five level ANPC converters by output 5 level values, i.e. 2E, E, and 0 ,-E ,-2E.And five level ANPC have 8 kinds of on off states, as shown in table 1, except 2E is with except-2E two level values only have a kind of on off state, other 3 level values have two Redundanter schalter states, but V1, V4, V5, V8 tetra-kinds of on off states in table 1, electric current does not flow through flying capacitor, therefore on the no impact of flying capacitor voltage.Namely at every phase 2E with using corresponding on off state V8 and V1 during-2E two level values respectively, during 0 level, two Redundanter schalter state V4 of 0 level and V5 mean allocation are used.To two intermediate level value E and-E, on off state V2, V3, V6, V7 along with the direction of load current inconsistent, also different on the impact of flying capacitor voltage, will be gone dynamically to select by following step.
As shown in Figure 4, five level ANPC can normally work, and flying capacitor voltage must remain on 1/4th of DC bus-bar voltage, i.e. E, export phase voltage and normally could export five level values.When first intermediate level E or-E arrives, mark position 1, carry out a Logic judgment, after selecting suitable Redundanter schalter state, mark position 0, stop Logic judgment, when next intermediate level is arrived, mark position 1, then carry out Logic judgment, select suitable Redundanter schalter state, repeat according to this.Carrying out the content that Logic judgment comprises two aspects, is judge flying capacitor magnitude of voltage on the one hand, and be the positive and negative of load current on the other hand, step S102 and step S103 judges above two aspects respectively.
Step S102: the magnitude of voltage detecting five level ANPC converter flying capacitor voltages in real time, and compare with the reference value of flying capacitor voltage, determine that flying capacitor needs charging or electric discharge.
Step S103: detect the positive and negative of five level ANPC converter load currents, the flying capacitor determined in the positive and negative and step S102 according to ANPC converter load current needs charging and discharging state to select the Redundanter schalter state of suitable ANPC converter.Wherein, load current is to flow to the direction of load for positive direction from the single-phase brachium pontis of five level ANPC converters.
Step S104: carry out discharge and recharge by the on off state selected to five level ANPC converter flying capacitors, until within a sampling period, the variable quantity of flying capacitor voltage is 0, returns step S102.
Step S102-S104 is specific as follows: as shown in Figure 4, in present embodiment, when detecting that intermediate level E arrives, mark position 1, the result that the flying capacitor voltage detected in real time by step S102 is compared with flying capacitor Voltage Reference, determines to flying capacitor charging or electric discharge.When the flying capacitor magnitude of voltage detected in real time is greater than reference voltage level E, then select Redundanter schalter state will discharge to flying capacitor, if when the flying capacitor magnitude of voltage detected in real time is less than reference voltage level E, then select Redundanter schalter state will charge to flying capacitor, and then the comprehensive descision that flows to of the load current detected by step S103 select suitable on off state to act on five level ANPC converters.As shown in Figure 5, when needs charge to flying capacitor, if load current is greater than 0, then selector switch state V7, if when load current is less than 0, then selector switch state V6.When needs discharge to flying capacitor, if load current is greater than 0, then selector switch state V6, if when load current is less than 0, then selector switch state V7.Equally, when detecting that intermediate level-E arrives, mark position 1, the result that the flying capacitor voltage detected in real time by step S102 is compared with flying capacitor Voltage Reference, determines to flying capacitor charging or electric discharge; When the flying capacitor magnitude of voltage detected in real time is greater than reference voltage level E, then select Redundanter schalter state will discharge to flying capacitor, if when the flying capacitor magnitude of voltage detected in real time is less than reference voltage level E, then select Redundanter schalter state will charge to flying capacitor, and then the comprehensive descision that flows to of the load current detected by step 4 select suitable on off state.As shown in Figure 5, when needs charge to flying capacitor, if load current is greater than 0, then selector switch state V3, if when load current is less than 0, then selector switch state V2.When needs discharge to flying capacitor, if load current is greater than 0, then selector switch state V2, if when load current is less than 0, then selector switch state V3.
Although the foregoing describe the specific embodiment of the present invention; but those skilled in the art are to be understood that; these only illustrate; various changes or modifications can be made to present embodiment; and not deviating from principle of the present invention and essence, protection scope of the present invention is only defined by the appended claims.
Claims (6)
1. five level ANPC converter flying capacitor voltage control methods, is characterized in that, comprise the following steps:
Step S101: determine the switch angle needing to arrange according to the modulation degree m of SHEPWM, determines that the three-phase that SHEPWM modulates exports, and exports three-phase five level SHEPWM impulse wave and acts on five level ANPC converters;
Step S102: detect five level ANPC converter flying capacitor magnitudes of voltage in real time, and compare with the reference value of flying capacitor voltage, determines that flying capacitor needs charging or electric discharge;
Step S103: detect the positive and negative of five level ANPC converter load currents, the flying capacitor determined in the positive and negative and step S102 according to ANPC converter load current needs charging and discharging state to select the Redundanter schalter state of suitable ANPC converter;
Step S104: carry out discharge and recharge by the on off state selected to five level ANPC converter flying capacitors, until within a sampling period, the variable quantity of flying capacitor voltage is 0, returns step S102.
2., according to five level ANPC converter flying capacitor voltage control methods according to claim 1, it is characterized in that: the electric current flowing through flying capacitor in described step S104 can be expressed as I
cf=I
s3-I
s1, the electric current flowing through each switching tube can be expressed as I
si=X
ii
load, wherein X
irepresent the on off state of each switching tube, as switching tube S
iduring conducting, X
ivalue be 1, as switching tube S
iduring shutoff, X
ivalue be 0; I
cf=(X
3-X
1) I
load, within a sampling period, the variable quantity of flying capacitor voltage is
3. according to five level ANPC converter flying capacitor voltage control methods according to claim 1, it is characterized in that: in described step S101, five level SHEPWM impulse waves act on five level ANPC converters and export 5 level and be respectively 2E, E, 0 ,-E and-2E.
4. according to five level ANPC converter flying capacitor voltage control methods according to claim 3, it is characterized in that: in step S102, when detecting that intermediate level E or-E arrives at every turn, mark position 1, when the flying capacitor magnitude of voltage detected in real time is greater than reference voltage level E, then select to discharge to flying capacitor; Otherwise, when the flying capacitor magnitude of voltage detected in real time is less than reference voltage level E, then select to charge to flying capacitor.
5. according to five level ANPC converter flying capacitor voltage control methods according to claim 4, it is characterized in that: in step S103, load current is to flow to the direction of load for positive direction from the single-phase brachium pontis of five level ANPC converters, load current is just, otherwise is negative.
6. according to five level ANPC converter flying capacitor voltage control methods according to claim 5, it is characterized in that: according to needing the suitable Redundanter schalter state of the positive and negative selection of flying capacitor charging and discharging state and load current in step S102, after selecting suitable Redundanter schalter state, mark position 0.
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| CN201410810131.6A CN104601026A (en) | 2014-12-23 | 2014-12-23 | Suspended capacitor voltage control method of five-level ANPC (Active Neutral-Point-Clamped) converter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787888A (en) * | 2016-12-26 | 2017-05-31 | 安徽大学 | A kind of three level ANPC converter neutral-point voltage balance methods |
| CN107070276A (en) * | 2017-04-20 | 2017-08-18 | 上海交通大学 | Active neutral point clamp Five-level converter DC side charging soft starting circuit and method |
| WO2017157338A1 (en) * | 2016-03-17 | 2017-09-21 | 汪洪亮 | Single-phase five-level active clamping converter unit and converter |
| CN107465207A (en) * | 2017-08-11 | 2017-12-12 | 阳光电源股份有限公司 | Flying capacitor five-electrical level inverter and its low voltage traversing control method and device |
| CN108712121A (en) * | 2018-04-20 | 2018-10-26 | 浙江大学 | DC bus-bar voltage based on Selective harmonic elimination pulsewidth modulation fluctuates the method for sampling |
| CN109474195A (en) * | 2018-11-28 | 2019-03-15 | 阳光电源股份有限公司 | Clamp capacitor voltage control method, control device and multi-electrical level inverter |
| CN110768557A (en) * | 2019-09-24 | 2020-02-07 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and modulation strategy thereof |
| CN111245271A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN113037111A (en) * | 2021-02-25 | 2021-06-25 | 安徽大学绿色产业创新研究院 | Space vector modulation method for current transformer |
| WO2022163212A1 (en) * | 2021-02-01 | 2022-08-04 | オムロン株式会社 | Power conversion device, and control method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017157338A1 (en) * | 2016-03-17 | 2017-09-21 | 汪洪亮 | Single-phase five-level active clamping converter unit and converter |
| CN106787888A (en) * | 2016-12-26 | 2017-05-31 | 安徽大学 | A kind of three level ANPC converter neutral-point voltage balance methods |
| CN106787888B (en) * | 2016-12-26 | 2019-04-02 | 安徽大学 | A kind of three level ANPC converter neutral-point voltage balance methods |
| CN107070276B (en) * | 2017-04-20 | 2019-04-12 | 上海交通大学 | Active neutral point clamp Five-level converter DC side charging soft starting circuit and method |
| CN107070276A (en) * | 2017-04-20 | 2017-08-18 | 上海交通大学 | Active neutral point clamp Five-level converter DC side charging soft starting circuit and method |
| CN107465207A (en) * | 2017-08-11 | 2017-12-12 | 阳光电源股份有限公司 | Flying capacitor five-electrical level inverter and its low voltage traversing control method and device |
| CN107465207B (en) * | 2017-08-11 | 2019-08-13 | 阳光电源股份有限公司 | Flying capacitor five-electrical level inverter and its low voltage traversing control method and device |
| CN108712121A (en) * | 2018-04-20 | 2018-10-26 | 浙江大学 | DC bus-bar voltage based on Selective harmonic elimination pulsewidth modulation fluctuates the method for sampling |
| CN108712121B (en) * | 2018-04-20 | 2021-02-05 | 浙江大学 | Direct-current bus voltage fluctuation sampling method based on selective harmonic elimination pulse width modulation |
| CN109474195A (en) * | 2018-11-28 | 2019-03-15 | 阳光电源股份有限公司 | Clamp capacitor voltage control method, control device and multi-electrical level inverter |
| CN110768557A (en) * | 2019-09-24 | 2020-02-07 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and modulation strategy thereof |
| CN111245271A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN111245271B (en) * | 2020-01-18 | 2021-06-11 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| WO2022163212A1 (en) * | 2021-02-01 | 2022-08-04 | オムロン株式会社 | Power conversion device, and control method |
| CN113037111A (en) * | 2021-02-25 | 2021-06-25 | 安徽大学绿色产业创新研究院 | Space vector modulation method for current transformer |
| CN113037111B (en) * | 2021-02-25 | 2022-05-31 | 安徽大学绿色产业创新研究院 | Space vector modulation method for current transformer |
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