CN106941324B - The DC voltage balance control method of neutral point clamp type three-level voltage source current transformer - Google Patents
The DC voltage balance control method of neutral point clamp type three-level voltage source current transformer Download PDFInfo
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- CN106941324B CN106941324B CN201710261849.8A CN201710261849A CN106941324B CN 106941324 B CN106941324 B CN 106941324B CN 201710261849 A CN201710261849 A CN 201710261849A CN 106941324 B CN106941324 B CN 106941324B
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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
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- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of DC voltage balance control methods of neutral point clamp type three-level voltage source current transformer, belong to electric automatization equipment and voltage source converter technical field.The method of the present invention exports the size of current direction and DC side or more capacitance voltage according to every phase bridge arm, by the delay time of two semiconductor switch device gate drive pulse rising edges and failing edge on the inside of the every phase bridge arm of voltage balance control strategy adjustment, to realize the balance control of DC side or more DC capacitor voltage.Its advantage is that: need to only adjust inner tube pulse can be realized the balance control of DC side or more capacitance voltage, and algorithm realizes that simply adjustment process is continuous, explicit physical meaning.
Description
Technical field
The present invention relates to a kind of DC voltage balance control methods of neutral point clamp type three-level voltage source current transformer, belong to
Electric automatization equipment and voltage source converter technical field.
Background technique
Neutral point clamp type (Neutral Point Clamped, NPC) three-level voltage source current transformer is in frequency converter, photovoltaic
It is widely used in a variety of power converter devices such as inverter, reacance generator.Three level voltage of neutral point clamp type
The DC side of source current transformer is in series by upper and lower two DC capacitors, and the intermediate series connection point of two DC capacitors is connected to each bridge
The midpoint of arm clamp diode, when the electric current of different size and direction flows into DC capacitor, and point is connected in series, upside direct current
Hold and both the difference of downside DC capacitor charging and discharging state can make voltage deviates, leads to capacitor Voltage unbalance up and down.
It will affect neutral point clamp type three-level voltage source current transformer performance when capacitance voltage is uneven serious above and below, even result in direct current
Overvoltage protection movement.The balance of DC capacitor voltage generally requires control strategy of taking the initiative, and is usually in existing method
Common-mode voltage, residual voltage or other control components are added in reference voltage, it is complex in realization.
Summary of the invention
The purpose of the present invention is to propose to a kind of voltage balance controls of neutral point clamp type three-level voltage source current transformer
Method exports the deviation size of current direction and DC side or more capacitor according to every phase bridge arm, adjusts every phase bridge by control strategy
The delay time of two semiconductor switch device gate drive pulse rising edges and failing edge on the inside of arm, to realize DC side or more
The balance of capacitance voltage controls.
The DC voltage balance control method of neutral point clamp type three-level voltage source current transformer proposed by the present invention, it is described
The voltage value of capacitor and lower capacitor is respectively U on the DC side of neutral point clamp type three-level voltage source current transformerC1And UC2, midpoint
The current value of the three-phase bridge arm output of Clamp three-level voltage source current transformer is respectively ia, ibAnd ic, electric current is to flow out bridge arm side
To being positive, by taking the A phase bridge arm of neutral point clamp type three-level voltage source current transformer as an example, four device for power switching of A phase bridge arm
Respectively G1, G2, G3 and G4, it is characterised in that method includes the following steps:
(1) voltage value of capacitor and lower capacitor on the output electric current and DC side of A phase bridge arm is judged:
If the output electric current i of A phase bridge armaGreater than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage under DC side
Value UC2, then make shift time t after the rising edge of the gate drive pulse of the device for power switching G2 and G3 of A phase bridge arm, wherein t=k
(UC1-UC2)；
If A phase bridge arm exports electric current iaGreater than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC1-UC2)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the rising edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
Wherein k is time adjustment coefficient, value range 10-6~10-7；
(2) the neutral point clamp type three-level voltage source current transformer A phase bridge arm power switch device obtained according to above-mentioned steps (1)
The gate drive pulse of part G2 and G3 handle the gate drive pulse reverse phase of device for power switching G2 to obtain device for power switching
The gate drive pulse of G4 handles the gate drive pulse reverse phase of device for power switching G3 to obtain the door of device for power switching G1
Pole driving pulse；
(3) method for utilizing above-mentioned steps (1) and (2), the B phase bridge arm of alignment Clamp three-level voltage source current transformer
It is equally adjusted with the gate drive pulse of each power device of C phase bridge arm, realizes that alignment Clamp three-level voltage source becomes
Flow the voltage balance control of device.
The method of the dc-voltage balance of neutral point clamp type three-level voltage source current transformer proposed by the present invention, advantage
It is:
The method of the present invention only need to export current direction according to every phase bridge arm of neutral point clamp type three-level voltage source current transformer
With the size of capacitor voltage value above and below DC side, two semiconductor switch device G2 and G3 gate poles on the inside of every phase bridge arm are directly adjusted
The delay time of driving pulse rising edge and failing edge, so that it may realize the balance control of DC side or more DC capacitor voltage,
Calculation method realizes that simply adjustment process is continuous, explicit physical meaning.
Detailed description of the invention
Fig. 1 is the corresponding neutral point clamp type three-level current transformer circuit diagram of the present invention.
Fig. 2 is the A phase bridge arm driving pulse and bridge arm output current wave of neutral point clamp type three-level voltage source current transformer
Schematic diagram.
Fig. 3 is the pulse regulation method schematic diagram of neutral point clamp type three-level voltage source current transformer.
Specific embodiment
The DC voltage balance control method of neutral point clamp type three-level voltage source current transformer proposed by the present invention, it is described
The voltage value of capacitor and lower capacitor is respectively U on the DC side of neutral point clamp type three-level voltage source current transformerC1And UC2, midpoint
The current value of the three-phase bridge arm output of Clamp three-level voltage source current transformer is respectively ia, ibAnd ic, electric current is to flow out bridge arm side
To being positive, by taking the A phase bridge arm of neutral point clamp type three-level voltage source current transformer as an example, four device for power switching of A phase bridge arm
The switch of respectively G1, G2, G3 and G4, each device for power switching are driven by gate drive pulse.If time adjustment coefficient is
K is calculated the gate drive pulse regulating time of device for power switching G2 and G3 by following situation.
Method includes the following steps:
(1) voltage value of capacitor and lower capacitor on the output electric current and DC side of A phase bridge arm is judged:
If the output electric current i of A phase bridge armaGreater than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage under DC side
Value UC2, then make shift time t after the rising edge of the gate drive pulse of the device for power switching G2 and G3 of A phase bridge arm, wherein t=k
(UC1-UC2)；
If A phase bridge arm exports electric current iaGreater than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC1-UC2)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value under DC side
UC2, then make shift time t, t=k (U after the rising edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
Wherein k is time adjustment coefficient, and value is set according to gate drive pulse width, and the purpose is to make pulse regulation
Time is no more than the 10% of pulse width, value range 10-6~10-7；
(2) the neutral point clamp type three-level voltage source current transformer A phase bridge arm power switch device obtained according to above-mentioned steps (1)
The gate drive pulse of part G2 and G3 handle the gate drive pulse reverse phase of device for power switching G2 to obtain device for power switching
The gate drive pulse of G4 handles the gate drive pulse reverse phase of device for power switching G3 to obtain the door of device for power switching G1
Pole driving pulse；
(3) method for utilizing above-mentioned steps (1) and (2), the B phase bridge arm of alignment Clamp three-level voltage source current transformer
It is equally adjusted with the gate drive pulse of each power device of C phase bridge arm, realizes that alignment Clamp three-level voltage source becomes
Flow the voltage balance control of device.
As shown in Figure 1, neutral point clamp type three-level voltage source current transformer is by capacitor on three-phase bridge arm, DC side and lower electricity
Hold, and connection reactance and filter circuit composition.Wherein, by taking A phase bridge arm as an example, G1~G4 is four semiconductor switch of the bridge arm
Device, D1~D4 are four inverse parallel freewheeling diodes of the bridge arm, and DB1 and DB2 are two clamp diodes of the bridge arm, C1 and
C2 is the shared capacitor of three-phase bridge arm.The direct current of neutral point clamp type three-level voltage source current transformer is acquired by voltage sample circuit
Capacitor and lower capacitance voltage value are respectively U on sideC1And UC2, three level voltage of neutral point clamp type is acquired by current sampling circuit
The three-phase bridge arm output electric current of source current transformer is respectively ia, ibAnd ic, electric current is positive with flowing out bridge arm direction.
Fig. 2 gives the gate-drive of A phase bridge arm output electric current, output voltage and four device for power switching G1~G4
Pulse, the electric current of device for power switching G1~G4, anti-paralleled diode D1~D4 electric current and clamp diode DB1 and DB2 electricity
Waveform is flowed, output electric current outflow bridge arm direction is positive.
Fig. 3 gives the schematic diagram of rise edge delay processing and failing edge delay disposal, and wherein Fig. 3 (a) prolongs for rising edge
Processing late, Fig. 3 (b) are failing edge delay disposal.
By taking A phase bridge arm as an example, the driving pulse of device for power switching G1~G4 has following three kinds of states: 1100,0110 Hes
0011, the voltage influence that bridge arm exports capacitor and lower capacitor in current direction and pulse pair is analyzed as follows:
(1) A phase bridge arm exports electric current iaWhen > 0:
When device for power switching G1~G4 gate drive pulse signal is 1100 or 0011, at DC bus capacitor C1 and C2
In electric discharge or the state that do not discharge that do not charge simultaneously.
When device for power switching G1~G4 gate drive pulse signal becomes 0110, capacitor C1 is in charged state or electricity
Hold C2 and be in discharge condition, the voltage of capacitor C1 rises at this time and capacitor C2 voltage declines.If voltage U under this operating conditionC1>UC2, then
Move back device for power switching G2, G3 gate-drive rising edge, reduce G2, G3 service time, thus reduce capacitor C1 charging or
Capacitor C2 discharge time, so that the voltage of capacitor C1 be made to decline or increase the voltage of capacitor C2；If voltage UC1< UC2, then
Become device for power switching G2 gate-drive failing edge (becoming 0011 from 0110) and G3 gate-drive failing edge (from 0110
1100) it moves back, increases capacitor C1 charging or capacitor C2 discharge time, to make under voltage rising or the capacitor C2 voltage of capacitor C1
Drop.
(2) A phase bridge arm exports electric current iaWhen < 0:
When the gate drive pulse signal of device for power switching G1~G4 is 1100 or 0011, DC bus capacitor C1 and C2
In electric discharge or the state that do not discharge that do not charge simultaneously.
When device for power switching G1~G4 gate drive pulse signal becomes 0110, capacitor C1 is in discharge condition or electricity
Hold C2 and be in charged state, the voltage of capacitor C2 rises at this time and capacitor C1 voltage declines.If voltage U under this operating conditionC1>UC2, then
Become device for power switching G2 gate-drive failing edge (becoming 0011 again by 0110) and G3 gate-drive failing edge (by 0110 again
1100) it moves back, increases the discharge time of capacitor C1 or the charging time of capacitor C2, to make voltage decline or the capacitor of capacitor C2
C1 voltage rises；If voltage UC1< UC2, then device for power switching G2, G3 gate-drive rising edge is moved back, power switch is reduced
Device G2, G3 service time reduces the discharge time of capacitor C1 or the charging time of capacitor C2, to make on the voltage of capacitor C1
It rises or the voltage of capacitor C2 declines.
Claims (1)
1. a kind of DC voltage balance control method of neutral point clamp type three-level voltage source current transformer, the neutral point clamp type
The voltage value of capacitor and lower capacitor is respectively U on the DC side of three-level voltage source current transformerC1And UC2, three electricity of neutral point clamp type
The current value of the three-phase bridge arm output of level voltage source current transformer is respectively ia, ibAnd ic, electric current is positive with flowing out bridge arm direction, with
For the A phase bridge arm of neutral point clamp type three-level voltage source current transformer, four device for power switching of A phase bridge arm be respectively G1,
G2, G3 and G4, it is characterised in that method includes the following steps:
(1) voltage value of capacitor and lower capacitor on the output electric current and DC side of A phase bridge arm is judged:
If the output electric current i of A phase bridge armaGreater than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage value under DC side
UC2, then make shift time t after the rising edge of the gate drive pulse of the device for power switching G2 and G3 of A phase bridge arm, wherein t=k
(UC1-UC2)；
If A phase bridge arm exports electric current iaGreater than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value U under DC sideC2,
Then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Greater than capacitance voltage value U under DC sideC2,
Then make shift time t, t=k (U after the failing edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC1-UC2)；
If A phase bridge arm exports electric current iaLess than 0, and capacitor voltage value U on DC sideC1Less than capacitance voltage value U under DC sideC2,
Then make shift time t, t=k (U after the rising edge of device for power switching G2 and the G3 gate drive pulse of A phase bridge armC2-UC1)；
Wherein k is time adjustment coefficient, value range 10-6~10-7；
(2) the neutral point clamp type three-level voltage source current transformer A phase bridge arm device for power switching G2 obtained according to above-mentioned steps (1)
With the gate drive pulse of G3, handle the gate drive pulse reverse phase of device for power switching G2 to obtain device for power switching G4's
Gate drive pulse drives the gate pole that the gate drive pulse reverse phase of device for power switching G3 handles to obtain device for power switching G1
Moving pulse；
(3) method for utilizing above-mentioned steps (1) and (2), the B phase bridge arm and C of alignment Clamp three-level voltage source current transformer
The gate drive pulse of each power device of phase bridge arm is equally adjusted, and realizes alignment Clamp three-level voltage source current transformer
Voltage balance control.
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| CN108540005B (en) * | 2018-04-27 | 2020-11-27 | 上能电气股份有限公司 | Direct-current bus voltage balance control method of three-level inverter |
| CN112803462A (en) * | 2021-03-05 | 2021-05-14 | 上海电气集团股份有限公司 | Forced turn-off method of static transfer switch based on energy storage converter |
| CN114915196A (en) * | 2022-04-21 | 2022-08-16 | 北京行实科技有限公司 | NPC-I type three-level bus midpoint balancing system, method, electronic device and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065292A (en) * | 2014-06-26 | 2014-09-24 | 许继电气股份有限公司 | Three-level converter neutral point potential balancing control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065292A (en) * | 2014-06-26 | 2014-09-24 | 许继电气股份有限公司 | Three-level converter neutral point potential balancing control method and device |
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Effective date of registration: 20190109 Address after: 215600 No. 8 Changxing Middle Road, Yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province Applicant after: Zhangjiagang Smartgrid Research Institute Address before: 215600 University Town, Changxing Road, Yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province Applicant before: Zhangjiagang Zhi electricity Xi Wei Semiconductor Converting Technology Co., Ltd |
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