CN109474195A - Clamp capacitor voltage control method, control device and multi-electrical level inverter - Google Patents
Clamp capacitor voltage control method, control device and multi-electrical level inverter Download PDFInfo
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- CN109474195A CN109474195A CN201811435790.0A CN201811435790A CN109474195A CN 109474195 A CN109474195 A CN 109474195A CN 201811435790 A CN201811435790 A CN 201811435790A CN 109474195 A CN109474195 A CN 109474195A
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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
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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
- H02M7/53—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
- H02M7/5387—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 in a bridge configuration
- H02M7/53871—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 in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—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 in a bridge configuration with automatic control of output voltage or current with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of clamp capacitor voltage control method, control device and multi-electrical level inverter, which is primarily based on the current state of clamp capacitor, determines target charge and discharge switch vector.When clamp capacitor is in stable state, it is based on current charge and discharge switch vector state, previous charge and discharge switch vector state, current clamp capacitor voltage and current clamp capacitor target voltage, determines target charge and discharge switch vector.When clamp capacitor is in transient state, it is based on current clamp capacitor voltage and current clamp capacitor target voltage, determines target charge and discharge switch vector.It can be seen that, the target charge and discharge switch vector that this programme passes through adjusting clamp capacitor, so that current clamp capacitor keeps almost the same with current clamp capacitor target voltage, i.e., improve the stability of clamp capacitor, reduce the voltage fluctuation of clamp capacitor, and then effectively improve output current wave quality, while reducing the voltage stress because of level fluctuation bring power switch tube.
Description
Technical field
The present invention relates to Photovoltaic new energy technical field, in particular to a kind of clamp capacitor voltage control method, control dress
It sets and multi-electrical level inverter.
Background technique
More level have been output into the common technology in mesohigh high-power frequency conversion field in recent years.Wherein, active midpoint pincers
Position multi-level circuit is common multi-level inverter circuit, at least one electricity that suspends is arranged by some position in circuit
Hold, so that its level is clamped, forms different level output.
Common five level inverter circuit is as shown in Figure 1, include multiple switch pipe and freewheeling diode, wherein multiple
Switching tube carries out turn-on and turn-off according to preset logic, and then realizes inversion function.Since multi-level inverter circuit is to utilize
Clamp capacitor Cf constructs a certain grade level, and therefore, the stability of clamp capacitor Cf directly affects the defeated of multi-level inverter circuit
The stability of voltage out.
Therefore, how a kind of clamp capacitor voltage control method, control device and multi-electrical level inverter, Neng Gouti are provided
The stability of high clamp capacitor reduces the voltage fluctuation of clamp capacitor, is those skilled in the art's big technology urgently to be resolved
Problem.
Summary of the invention
The present invention provides a kind of clamp capacitor voltage control method, control device and multi-electrical level inverter, to improve pincers
The stability of position capacitor, reduces the voltage fluctuation of clamp capacitor.
In order to achieve the object, technical solution provided by the present application is as follows:
A kind of clamp capacitor voltage control method is applied to multi-level inverter circuit, comprising:
Current state based on clamp capacitor, determines target charge and discharge switch vector, the current state include stable state with
And transient state；
When the clamp capacitor is in the stable state,
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor electricity
Pressure and the current clamp capacitor target voltage, determine the target charge and discharge switch vector；
When the clamp capacitor is in the transient state,
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, determine that the target charge and discharge is established by cable
Close vector.
Optionally, further includes:
Based on the current clamp capacitor voltage and the current clamp capacitor target voltage, the clamp capacitor is determined
Current state.
Optionally, described to be based on the current clamp capacitor voltage and the current clamp capacitor target voltage, it determines
The current state of the clamp capacitor, comprising:
Obtain the current clamp capacitor voltage and the current clamp capacitor target voltage of the clamp capacitor；
When the current clamp capacitor voltage is more than or equal to the current clamp capacitor target voltage and the first predetermined capacitive
The difference of magnitude of a voltage fluctuation, and it is less than or equal to the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation
And when, determine that the clamp capacitor is in the stable state；
When the current clamp capacitor voltage is less than the current clamp capacitor target voltage and the first predetermined capacitive voltage
The difference of undulating value, or greater than the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, really
The fixed clamp capacitor is in the transient state.
Optionally, described to be based on previous charge and discharge switch vector state, determine current clamp capacitor target voltage, comprising:
Obtain the previous charge and discharge switch vector state of the clamp capacitor and the target voltage of clamp capacitor；
When the previous charge and discharge switch vector state is charged state, determine current clamp capacitor target voltage for institute
State the difference of target voltage Yu first voltage changing value；
When the previous charge and discharge switch vector state is discharge condition, determine current clamp capacitor target voltage for institute
State target voltage and second voltage changing value and.
Optionally, it is described based on current charge and discharge switch vector state, it is the previous charge and discharge switch vector state, current
Clamp capacitor voltage and the current clamp capacitor target voltage, determine the target charge and discharge switch vector, comprising:
Obtain the previous charge and discharge switch vector state, the current charge and discharge switch vector state and current clamper
Capacitance voltage；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state are charging shape
When state, and, the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, determines that the target charge and discharge is established by cable
Pass vector is discharge switch vector；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state are electric discharge shape
When state, and, the current clamp capacitor voltage is less than the current clamp capacitor target voltage, determines that the target charge and discharge is established by cable
Pass vector is charge switch vector；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state difference, determine
The target charge and discharge switch vector is the current charge and discharge switch vector state.
Optionally, it is described be based on current clamp capacitor voltage and the current clamp capacitor target voltage, determine described in
Target charge and discharge switch vector, comprising:
When the current clamp capacitor voltage is less than the current clamp capacitor target voltage and the first predetermined capacitive voltage
The difference of undulating value determines that the target charge and discharge switch vector is charge switch vector；
When the current clamp capacitor voltage is greater than the current clamp capacitor target voltage and the second predetermined capacitive voltage
Undulating value and when, determine the target charge and discharge switch vector be discharge switch vector.
A kind of clamp capacitor voltage control device, comprising:
Target voltage compensating unit determines target charge and discharge switch vector, institute for the current state based on clamp capacitor
Stating current state includes stable state and transient state；
Charge-discharge control unit is used for when the clamp capacitor is in the stable state,
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor electricity
Pressure and the current clamp capacitor target voltage, determine the target charge and discharge switch vector；
When the clamp capacitor is in the transient state,
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, determine that the target charge and discharge is established by cable
Close vector.
Optionally, further includes:
Determination unit, for being based on the current clamp capacitor voltage and the current clamp capacitor target voltage, really
The current state of the fixed clamp capacitor.
Optionally, the determination unit includes:
First obtains subelement, for obtaining the current clamp capacitor voltage of the clamp capacitor and described current
Clamp capacitor target voltage；
First determines subelement, for being more than or equal to the current clamp capacitor target when the current clamp capacitor voltage
The difference of voltage and the first predetermined capacitive magnitude of a voltage fluctuation, and it is less than or equal to the current clamp capacitor target voltage and second in advance
If voltage fluctuation of capacitor value and when, determine that the clamp capacitor is in the stable state；
Second determines subelement, for being less than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the difference of the first predetermined capacitive magnitude of a voltage fluctuation, or to be greater than the current clamp capacitor target voltage and the second predetermined capacitive electric
Press undulating value and when, determine that the clamp capacitor is in the transient state.
Optionally, the charge-discharge control unit includes:
Second obtains subelement, for obtaining the previous charge and discharge switch vector state and clamper electricity of the clamp capacitor
The target voltage of appearance；
Third determines subelement, for determining current when the previous charge and discharge switch vector state is charged state
Clamp capacitor target voltage is the difference of the target voltage and first voltage changing value；
4th determines subelement, for determining current when the previous charge and discharge switch vector state is discharge condition
Clamp capacitor target voltage be the target voltage and second voltage changing value and.
Optionally, the charge-discharge control unit further include:
Third obtains subelement, for obtaining the previous charge and discharge switch vector state, the current charge and discharge switch
Vector state and current clamp capacitor voltage；
5th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state is charged state, and, the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, really
The fixed target charge and discharge switch vector is discharge switch vector；
6th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state is discharge condition, and, the current clamp capacitor voltage is less than the current clamp capacitor target voltage, really
The fixed target charge and discharge switch vector is charge switch vector；
7th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state difference, determine that the target charge and discharge switch vector is the current charge and discharge switch vector state.
Optionally, the charge-discharge control unit further include:
8th determines subelement, for being less than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the difference of the first predetermined capacitive magnitude of a voltage fluctuation, determine that the target charge and discharge switch vector is charge switch vector；
9th determines subelement, for being greater than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the second predetermined capacitive magnitude of a voltage fluctuation and when, determine the target charge and discharge switch vector be discharge switch vector.
A kind of multi-electrical level inverter, including the above-mentioned clamp capacitor voltage control device of any one.
The present invention provides a kind of clamp capacitor voltage control method, control device and multi-electrical level inverter, the controls
Method is primarily based on the current state of clamp capacitor, determines target charge and discharge switch vector.When the clamp capacitor is in described
When stable state, established by cable after determining current clamp capacitor target voltage based on current charge and discharge based on previous charge and discharge switch vector state
Close vector state, the previous charge and discharge switch vector state, current clamp capacitor voltage and the current clamp capacitor mesh
Voltage is marked, determines the target charge and discharge switch vector.When the clamp capacitor is in the transient state, based on current clamper electricity
Hold voltage and the current clamp capacitor target voltage, determines the target charge and discharge switch vector.As it can be seen that this programme provides
Clamp capacitor voltage control method can according to current clamp capacitor voltage and the current clamp capacitor target voltage, adjust
The target charge and discharge switch vector of clamp capacitor is saved, so that current clamp capacitor and current clamp capacitor target voltage are kept
It is almost the same, that is, the stability for improving clamp capacitor reduces the voltage fluctuation of clamp capacitor, and then effectively improves output electricity
Waveform quality is flowed, while reducing the voltage stress because of level fluctuation bring power switch tube.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of common five level inverter circuit；
Fig. 2 a, Fig. 2 b, Fig. 2 c and Fig. 2 d be five level inverter circuits four kinds of charge and discharge control paths schematic diagram；
Fig. 3 is a kind of existing structural schematic diagram of the voltage-operated device of clamp capacitor；
Fig. 4 and Fig. 5 is using the corresponding voltage curve schematic diagram of existing clamp capacitor voltage control method；
Fig. 6 is that the embodiment of the invention provides a kind of flow diagrams of clamp capacitor voltage control method；
Fig. 7 is that the embodiment of the invention provides a kind of structural schematic diagrams of clamp capacitor voltage control device；
Fig. 8 is that the embodiment of the invention provides a kind of another flow diagrams of clamp capacitor voltage control method；
Fig. 9 is that the embodiment of the invention provides a kind of another flow diagrams of clamp capacitor voltage control method；
Figure 10 is that the embodiment of the invention provides a kind of another flow diagrams of clamp capacitor voltage control method；
Figure 11 is that the embodiment of the invention provides a kind of another flow diagrams of clamp capacitor voltage control method；
Figure 12 is a kind of active five electricity of neutral-point-clamped applied by clamp capacitor voltage control device provided in this embodiment
The structural schematic diagram on ordinary telegram road；
Figure 13 is a kind of schematic diagram of active five clamping capacitor stable state of neutral-point-clamped control；
Figure 14 is a kind of schematic diagram of the clamp capacitor stable state control of five level of active neutral-point-clamped in the prior art；
Figure 15 is the corresponding voltage curve schematic diagram of clamp capacitor voltage control method provided by the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
As described in background, in conjunction with Fig. 1, since multi-level inverter circuit is to construct certain first-class using clamp capacitor Cf
Grade level, therefore, the stability of clamp capacitor Cf directly affects the stability of the output voltage of multi-level inverter circuit.
The prior art is to achieve the effect that maintain Cf voltage stabilization by the charging and discharging control to Cf.According to output
Sense of current, voltage clamp circuit Q1~Q4 are acted according to 1 switching vector selector of table, and there are 4 kinds of charge and discharge control paths, are such as schemed
2a), b), c), d) shown in.
Table 1
Specifically, as shown in figure 3, passing through the voltage and output electric current of acquisition clamp capacitor Cf, setting Cf target voltageTarget voltageWith feedback voltage VCfDifference and the product of output electric current i are compared with 0, to obtain charge and discharge switch
Vectorial combination.In conjunction with Fig. 3, wherein electric current i distinguishes direction, in the present embodiment, setting electric current i according to outflow/inflow inverter
It is positive direction that outflow inverter, which is reference direction, therefore:
When electric current i flow out inverter,Greater than VCfWhen, i.e. target voltageWith feedback voltage VCfDifference and output electric current
The product of i is greater than 0, can control Cf voltage by the switching vector selector in Fig. 2 a and rise；
When electric current i flow out inverter,Less than VCfWhen, i.e. target voltageWith feedback voltage VCfDifference and output electric current i
Product less than 0, can pass through the switching vector selector in Fig. 2 b control Cf voltage decline.
When electric current i flows into inverter, by different switching vector selector selections, equally available Cf voltage is risen or fallen,
As shown in Fig. 2 c and Fig. 2 d.
However, it is found by the inventors that at least there are the following problems for the scheme of the prior art:
1) when the misjudgment of charge and discharge switch vector, it will cause Cf voltage and be mutated.
Specifically, needing to judge to have directive output current signal since Cf voltage close loop controls, output electric current is
Inverter filtering inductive current, there are ripples for current signal, and special current signal is smaller or high direct voltage occasion, ripple current are past
When toward larger and near zero-crossing point, there are the frequent positive and negative alternating of current signal, the factors such as error, drift of sample circuit,
Current direction easily judges misalignment, and switching vector selector selects mistake, and Cf is caused multiple charge or discharge occur, and voltage crosses great fluctuation process, such as
Shown in Fig. 4, wherein t1、t2Moment switching vector selector selects mistake, leads to Cf voltage (solid line) VCfDeviate target voltageTsFor
Switch periods.
2) control delay causes Cf scope range of the fluctuation of voltage big.
Specifically, current inverter control mostly uses Digital Signals, its advantage is that complex logic control may be implemented,
The disadvantage is that Digital Signals can introduce delay, and it is not good for system stability, in the control of clamp capacitor Cf voltage close loop, Cf control
It is delayed also problematic, the behavior of charge and discharge switch vector judgement and the behavior of charge and discharge switch vector movement cannot be same again
It controls in the period and completes, in addition the delay factor of signal sampling is superimposed, causes trickle charge in steady state operation and continuously put
Electrical phenomena increases clamp capacitor voltage fluctuation range, and the level fluctuation of directly embodiment bridge arm output increases, as shown in Figure 5 number
Word control system Cf control delay, continuous charge and discharge, Cf voltage (solid line) VCfFluctuate situation.
To sum up, current control method will lead to:
1) output current characteristic that bridge arm output level is formed after filtering is deteriorated, and introduces harmonic wave, while causing reactance
Noise increases.
2) part power switch tube receiving voltage stress is related to clamp capacitor level grade in topology, clamp capacitor level
Fluctuation may cause power switch tube unbalanced stress weighing apparatus, especially in high-pressure area, in addition exceed stress specification, formed safety it is hidden
Suffer from, reduces reliability.
3) clamp capacitor voltage fluctuates big current oscillation easy to form.
And in practical application, the factors such as system cost, volume are further accounted for, so that the capacitance of clamp capacitor Cf may be into one
Step is restricted, at this point, the problem of voltage fluctuation of Cf is brought is more prominent.
In view of this, can be realized clamp capacitor the embodiment of the invention provides a kind of clamp capacitor voltage control method
Voltage Stability Control of the Cf in steady-state process and the Voltage Stability Control in transient process.Specifically, as shown in fig. 6,
The clamp capacitor voltage control method is applied to multi-level inverter circuit, and the multi-level inverter circuit and clamp capacitor voltage control
Device constitutes clamp capacitor voltage control system.Wherein, the control device as shown in fig. 7, comprises: target voltage compensating unit 71
And charge-discharge control unit 72.This voltage control method comprising steps of
S61, the current state based on clamp capacitor determine target charge and discharge switch vector.
Wherein, in the present embodiment, the current state of clamp capacitor includes stable state and transient state.In the present embodiment, fixed
Adopted current clamp capacitor voltage is more than or equal to the difference of current clamp capacitor target voltage and the first predetermined capacitive magnitude of a voltage fluctuation,
And be less than or equal to current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, the current shape of clamp capacitor
State is stable state.Current clamp capacitor voltage is defined less than current clamp capacitor target voltage and the first predetermined capacitive magnitude of a voltage fluctuation
Difference, or greater than current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, clamp capacitor is worked as
Preceding state is transient state.
S62, when the clamp capacitor is in the stable state, target charge and discharge switch swear method for determination of amount it is as follows:
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor electricity
Pressure and the current clamp capacitor target voltage, determine the target charge and discharge switch vector.
S63, when the clamp capacitor is in the transient state, target charge and discharge switch swear method for determination of amount it is as follows:
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, determine that the target charge and discharge is established by cable
Close vector.
As it can be seen that the clamp capacitor voltage control method that this programme provides can be according to current clamp capacitor voltage and described
Current clamp capacitor target voltage, adjusts the target charge and discharge switch vector of clamp capacitor so that current clamp capacitor with
Current clamp capacitor target voltage keeps almost the same, that is, the stability for improving clamp capacitor reduces the voltage of clamp capacitor
Fluctuation, and then output current wave quality is effectively improved, while reducing because the voltage of level fluctuation bring power switch tube is answered
Power.
On the basis of the above embodiments, as shown in figure 8, the embodiment of the invention provides a kind of controls of clamp capacitor voltage
Method further comprises the steps of:
S81, it is based on the current clamp capacitor voltage and the current clamp capacitor target voltage, determines the clamper
The current state of capacitor.
Wherein, step S81 can be realized by following specific steps, specifically:
Obtain the current clamp capacitor voltage and the current clamp capacitor target voltage of the clamp capacitor；
When the current clamp capacitor voltage is more than or equal to the current clamp capacitor target voltage and the first predetermined capacitive
The difference of magnitude of a voltage fluctuation, and it is less than or equal to the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation
And when, determine that the clamp capacitor is in the stable state；
When the current clamp capacitor voltage is less than the current clamp capacitor target voltage and the first predetermined capacitive voltage
The difference of undulating value, or greater than the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, really
The fixed clamp capacitor is in the transient state.
On the basis of the above embodiments, it is established by cable as shown in figure 9, being based on previous charge and discharge the embodiment of the invention provides one kind
Vector state is closed, determines the specific implementation step of current clamp capacitor target voltage, comprising:
The target voltage of S91, the previous charge and discharge switch vector state for obtaining the clamp capacitor and clamp capacitor；
S92, when the previous charge and discharge switch vector state be charged state when, determine current clamp capacitor target voltage
For the difference of the target voltage and first voltage changing value；
S93, when the previous charge and discharge switch vector state be discharge condition when, determine current clamp capacitor target voltage
For the target voltage and second voltage changing value and.
Except this, as shown in Figure 10, the embodiment of the invention also provides one kind to be based on current charge and discharge switch vector state, institute
Previous charge and discharge switch vector state, current clamp capacitor voltage and the current clamp capacitor target voltage are stated, determines institute
State the specific implementation step of target charge and discharge switch vector, comprising:
S101, the previous charge and discharge switch vector state, the current charge and discharge switch vector state are obtained and is worked as
Preceding clamp capacitor voltage；
S102, when the previous charge and discharge switch vector state and the current charge and discharge switch vector state be to fill
When electricity condition, and, the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, determines the target charge and discharge
Electric switch vector is discharge switch vector；
S103, when the previous charge and discharge switch vector state and the current charge and discharge switch vector state be to put
When electricity condition, and, the current clamp capacitor voltage is less than the current clamp capacitor target voltage, determines the target charge and discharge
Electric switch vector is charge switch vector；
S104, when the previous charge and discharge switch vector state and the current charge and discharge switch vector state it is different
When, determine that the target charge and discharge switch vector is the current charge and discharge switch vector state.
On the basis of the above embodiments, as shown in figure 11, the embodiment of the invention provides one kind based on current clamper electricity
Hold voltage and the current clamp capacitor target voltage, determine the specific implementation step of the target charge and discharge switch vector,
Include:
S111, when the current clamp capacitor voltage be less than the current clamp capacitor target voltage and the first predetermined capacitive
The difference of magnitude of a voltage fluctuation determines that the target charge and discharge switch vector is charge switch vector；
S112, when the current clamp capacitor voltage be greater than the current clamp capacitor target voltage and the second predetermined capacitive
Magnitude of a voltage fluctuation and when, determine the target charge and discharge switch vector be discharge switch vector.
Schematically, the capacitance of clamp capacitor Cf is set as C, and Cf voltage is VCf, output electric current is i, Cf voltage control week
Phase is Ts, the Cf charging time is Ton1, Cf discharge time is Ton2.It should be noted that in this embodiment it is assumed that in each control
Cycle T processedsInterior, output electric current i is approximately constant.
Wherein, target voltage compensating unit 71 is for adjusting target voltage
For charge switch vector, Ton1The time that Cf is flowed into for electric current i, in Ton1Period, Cf voltage rise
For discharge switch vector, Ton2The time of Cf is flowed out for electric current i；In Ton2Period, the decline of Cf voltage
Specifically, target voltage compensating unit 71 obtains a preceding charge and discharge switch vector state first；
If a preceding charge and discharge switch vector state is charging, current clamp capacitor target voltage is adjusted are as follows:
If a preceding charge and discharge switch vector state is electric discharge, current clamp capacitor target voltage is adjusted are as follows:
Wherein, charge-discharge control unit 72 is according to preceding primary and current charge and discharge switch vector state and clamp capacitor voltage
With target voltage adjustedRelationship, redistribute charge and discharge switch vector.
Specifically, defining Cf voltage power supply sectionΔVCf1To set acceptable
Cf voltage fluctuation lower limit value, Δ VCf2It can be set in the present embodiment for setting acceptable Cf voltage fluctuation upper limit value
ΔVon1<ΔVCf1<2*ΔVon1, Δ Von2<ΔVCf2<2*ΔVon2。
Work as VCfMeetThat is Cf runs on steady state voltage section, charge and discharge control
Unit 72 obtains a preceding charge and discharge switch vector state, current charge and discharge switch vector state and current clamp capacitor electricity
Press VCf；
If preceding primary and current charge and discharge switch vector state is charging, and is metCharge-discharge control unit
Readjust current charge and discharge switch vector: charge switch vector median filters are discharge switch vector；
If preceding primary and current charge and discharge switch vector state is electric discharge, and is metCharge-discharge control unit
Readjust current charge and discharge switch vector: discharge switch vector median filters are charge switch vector；
If a preceding charge and discharge switch vector state is charging, current charge and discharge switch vector state is electric discharge, Huo Zheqian
Charge and discharge switch vector state is electric discharge, current charge and discharge switch vector state is charging, and charge-discharge control unit is not done
Adjustment.
Except this, charge-discharge control unit further includes the control of transient process, as follows:
In current clamp capacitor voltage VCfLess than current clamp capacitor target voltageWhen certain amplitude, such as current pincers
Position capacitance voltage is less than the difference of the current clamp capacitor target voltage and the first predetermined capacitive magnitude of a voltage fluctuation, i.e.,If current charge and discharge switch vector state is electric discharge, charge-discharge control unit readjusts current charge and discharge
Electric switch vector: discharge switch vector median filters are charge switch vector.If current charge and discharge switch vector state is charging, charge and discharge
Electric control unit does not adjust；
In current clamp capacitor voltage VCfGreater than current clamp capacitor target voltageWhen certain amplitude, such as current pincers
Position capacitance voltage be greater than current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, i.e.,If current charge and discharge switch vector state is charging, charge-discharge control unit readjusts current charge and discharge
Electric switch vector: charge switch vector median filters are discharge switch vector.If current charge and discharge switch vector state is electric discharge, charge and discharge
Electric control unit does not adjust.
To sum up, this programme passes through the target charge and discharge switch vector for adjusting clamp capacitor, so that current clamp capacitor
Keep almost the same with current clamp capacitor target voltage, that is, the stability for improving clamp capacitor reduces the electricity of clamp capacitor
Pressure fluctuation, and then output current wave quality is effectively improved, while reducing the voltage because of level fluctuation bring power switch tube
Stress.
On the basis of the above embodiments, the present embodiment additionally provides a kind of clamp capacitor voltage control device, comprising:
Target voltage compensating unit determines target charge and discharge switch vector, institute for the current state based on clamp capacitor
Stating current state includes stable state and transient state；
Charge-discharge control unit is used for when the clamp capacitor is in the stable state,
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor electricity
Pressure and the current clamp capacitor target voltage, determine the target charge and discharge switch vector；
When the clamp capacitor is in the transient state,
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, determine that the target charge and discharge is established by cable
Close vector.
Wherein, which can also include:
Determination unit, for being based on the current clamp capacitor voltage and the current clamp capacitor target voltage, really
The current state of the fixed clamp capacitor.
Except this, the determination unit includes:
First obtains subelement, for obtaining the current clamp capacitor voltage of the clamp capacitor and described current
Clamp capacitor target voltage；
First determines subelement, for being more than or equal to the current clamp capacitor target when the current clamp capacitor voltage
The difference of voltage and the first predetermined capacitive magnitude of a voltage fluctuation, and it is less than or equal to the current clamp capacitor target voltage and second in advance
If voltage fluctuation of capacitor value and when, determine that the clamp capacitor is in the stable state；
Second determines subelement, for being less than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the difference of the first predetermined capacitive magnitude of a voltage fluctuation, or to be greater than the current clamp capacitor target voltage and the second predetermined capacitive electric
Press undulating value and when, determine that the clamp capacitor is in the transient state.
Except this, the charge-discharge control unit includes:
Second obtains subelement, for obtaining the previous charge and discharge switch vector state and clamper electricity of the clamp capacitor
The target voltage of appearance；
Third determines subelement, for determining current when the previous charge and discharge switch vector state is charged state
Clamp capacitor target voltage is the difference of the target voltage and first voltage changing value；
4th determines subelement, for determining current when the previous charge and discharge switch vector state is discharge condition
Clamp capacitor target voltage be the target voltage and second voltage changing value and.
Except this, the charge-discharge control unit further include:
Third obtains subelement, for obtaining the previous charge and discharge switch vector state, the current charge and discharge switch
Vector state and current clamp capacitor voltage；
5th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state is charged state, and, the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, really
The fixed target charge and discharge switch vector is discharge switch vector；
6th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state is discharge condition, and, the current clamp capacitor voltage is less than the current clamp capacitor target voltage, really
The fixed target charge and discharge switch vector is charge switch vector；
7th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch
When vector state difference, determine that the target charge and discharge switch vector is the current charge and discharge switch vector state.
Except this, the charge-discharge control unit further include:
8th determines subelement, for being less than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the difference of the first predetermined capacitive magnitude of a voltage fluctuation, determine that the target charge and discharge switch vector is charge switch vector；
9th determines subelement, for being greater than the current clamp capacitor target voltage when the current clamp capacitor voltage
With the second predetermined capacitive magnitude of a voltage fluctuation and when, determine the target charge and discharge switch vector be discharge switch vector.
It should be noted that the working principle of the clamp capacitor voltage control device refers to the implementation of above-mentioned control method
Example, herein not repeated description.
Figure 12 is please referred to, Figure 12 is during one kind applied by clamp capacitor voltage control device provided in this embodiment is active
Point five level circuit of clamper.Wherein, clamp capacitor Cf constructs a level VCf, circuit output+Vdc/2、+Vdc/2-VCf、0、-
Vdc/2+VCf、-Vdc/ 2 five level grades, for five level circuits, clamp capacitor target voltage
Therefore, in the present embodiment, in the steady state, what clamp capacitor voltage can be stable operates in [Vdc/4-ΔVCf1,Vdc/
4+ΔVCf2] section, Figure 13 is a kind of schematic diagram of active five clamping capacitor stable state of neutral-point-clamped control, and curve a is five electricity
The level grade of flat circuit output the, in [V of restrictiondc/4-ΔVCf1,Vdc/4+ΔVCf2] section, voltage stabilization, fluctuation is small, bent
Line b is clamp capacitor steady state voltage.
Figure 14 is a kind of schematic diagram of the clamp capacitor stable state control of five level of active neutral-point-clamped in the prior art, pincers
The virtual voltage fluctuation of position capacitor is larger, and such as the curve a in Figure 14, the level fluctuation for causing bridge arm to export is big, in Figure 14
Curve b, performance and stabilization to system have an adverse effect.
And in the present solution, clamp capacitor voltage can quickly track the adjustment of target voltage under transient state, as shown in figure 15,
Wherein curve a is the variation of clamp capacitor target voltage, and curve b is the variation of clamp capacitor virtual voltage.
In conjunction with attached drawing, it is not difficult to find that the present embodiment can be improved the stability of clamp capacitor, reduce the electricity of clamp capacitor
Pressure fluctuation, and then effectively improve output current wave quality.
On the basis of the above embodiments, the present embodiment additionally provides a kind of multi-electrical level inverter, including in any one
The clamp capacitor voltage control device stated.
To sum up, the present invention provides a kind of clamp capacitor voltage control method, control device and multi-electrical level inverters, should
Control method is primarily based on the current state of clamp capacitor, determines target charge and discharge switch vector.When the clamp capacitor is in
When the stable state, it is based on previous charge and discharge switch vector state, after determining current clamp capacitor target voltage, is based on current charge and discharge
Electric switch vector state, the previous charge and discharge switch vector state, current clamp capacitor voltage and the current clamper electricity
Hold target voltage, determines the target charge and discharge switch vector.When the clamp capacitor is in the transient state, based on current pincers
Position capacitance voltage and the current clamp capacitor target voltage, determine the target charge and discharge switch vector.As it can be seen that this programme
The clamp capacitor voltage control method of offer can be according to current clamp capacitor voltage and the current clamp capacitor target electricity
Pressure, adjusts the target charge and discharge switch vector of clamp capacitor, so that current clamp capacitor and current clamp capacitor target electricity
Pressure keeps almost the same, that is, the stability for improving clamp capacitor reduces the voltage fluctuation of clamp capacitor, and then effectively improves
Output current wave quality, while reducing the voltage stress because of level fluctuation bring power switch tube.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (13)
1. a kind of clamp capacitor voltage control method is applied to multi-level inverter circuit characterized by comprising
Current state based on clamp capacitor, determines target charge and discharge switch vector, and the current state includes stable state and temporarily
State；
When the clamp capacitor is in the stable state,
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor voltage with
And the current clamp capacitor target voltage, determine the target charge and discharge switch vector；
When the clamp capacitor is in the transient state,
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, the target charge and discharge switch arrow is determined
Amount.
2. clamp capacitor voltage control method according to claim 1, which is characterized in that further include:
Based on the current clamp capacitor voltage and the current clamp capacitor target voltage, working as the clamp capacitor is determined
Preceding state.
3. clamp capacitor voltage control method according to claim 2, which is characterized in that described to be based on the current clamper
Capacitance voltage and the current clamp capacitor target voltage, determine the current state of the clamp capacitor, comprising:
Obtain the current clamp capacitor voltage and the current clamp capacitor target voltage of the clamp capacitor；
When the current clamp capacitor voltage is more than or equal to the current clamp capacitor target voltage and the first predetermined capacitive voltage
The difference of undulating value, and be less than or equal to the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and
When, determine that the clamp capacitor is in the stable state；
When the current clamp capacitor voltage is less than the current clamp capacitor target voltage and the first predetermined capacitive voltage fluctuation
The difference of value, or greater than the current clamp capacitor target voltage and the second predetermined capacitive magnitude of a voltage fluctuation and when, determine institute
It states clamp capacitor and is in the transient state.
4. clamp capacitor voltage control method according to claim 3, which is characterized in that described to be established by cable based on previous charge and discharge
Vector state is closed, determines current clamp capacitor target voltage, comprising:
Obtain the previous charge and discharge switch vector state of the clamp capacitor and the target voltage of clamp capacitor；
When the previous charge and discharge switch vector state is charged state, determine that current clamp capacitor target voltage is the mesh
Mark the difference of voltage and first voltage changing value；
When the previous charge and discharge switch vector state is discharge condition, determine that current clamp capacitor target voltage is the mesh
Mark voltage and second voltage changing value and.
5. clamp capacitor voltage control method according to claim 4, which is characterized in that described to be established by cable based on current charge and discharge
Close vector state, the previous charge and discharge switch vector state, current clamp capacitor voltage and the current clamp capacitor mesh
Voltage is marked, determines the target charge and discharge switch vector, comprising:
Obtain the previous charge and discharge switch vector state, the current charge and discharge switch vector state and current clamp capacitor
Voltage；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state are charged state,
And the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, determines the target charge and discharge switch arrow
Amount is discharge switch vector；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state are discharge condition,
And the current clamp capacitor voltage is less than the current clamp capacitor target voltage, determines the target charge and discharge switch arrow
Amount is charge switch vector；
When the previous charge and discharge switch vector state and the current charge and discharge switch vector state difference, described in determination
Target charge and discharge switch vector is the current charge and discharge switch vector state.
6. clamp capacitor voltage control method according to claim 4, which is characterized in that described to be based on current clamp capacitor
Voltage and the current clamp capacitor target voltage, determine the target charge and discharge switch vector, comprising:
When the current clamp capacitor voltage is less than the current clamp capacitor target voltage and the first predetermined capacitive voltage fluctuation
The difference of value determines that the target charge and discharge switch vector is charge switch vector；
When the current clamp capacitor voltage is greater than the current clamp capacitor target voltage and the second predetermined capacitive voltage fluctuation
Value and when, determine the target charge and discharge switch vector be discharge switch vector.
7. a kind of clamp capacitor voltage control device characterized by comprising
Target voltage compensating unit determines target charge and discharge switch vector for the current state based on clamp capacitor, described to work as
Preceding state includes stable state and transient state；
Charge-discharge control unit is used for when the clamp capacitor is in the stable state,
Based on previous charge and discharge switch vector state, current clamp capacitor target voltage is determined；
Based on current charge and discharge switch vector state, the previous charge and discharge switch vector state, current clamp capacitor voltage with
And the current clamp capacitor target voltage, determine the target charge and discharge switch vector；
When the clamp capacitor is in the transient state,
Based on current clamp capacitor voltage and the current clamp capacitor target voltage, the target charge and discharge switch arrow is determined
Amount.
8. clamp capacitor voltage control device according to claim 7, which is characterized in that further include:
Determination unit determines institute for being based on the current clamp capacitor voltage and the current clamp capacitor target voltage
State the current state of clamp capacitor.
9. clamp capacitor voltage control device according to claim 8, which is characterized in that the determination unit includes:
First obtain subelement, for obtain the clamp capacitor the current clamp capacitor voltage and the current clamper
Capacitance object voltage；
First determines subelement, for being more than or equal to the current clamp capacitor target voltage when the current clamp capacitor voltage
With the difference of the first predetermined capacitive magnitude of a voltage fluctuation, and it is less than or equal to the current clamp capacitor target voltage and second default electric
Hold magnitude of a voltage fluctuation and when, determine that the clamp capacitor is in the stable state；
Second determines subelement, for being less than the current clamp capacitor target voltage and the when the current clamp capacitor voltage
The difference of one predetermined capacitive magnitude of a voltage fluctuation, or it is greater than the current clamp capacitor target voltage and the second predetermined capacitive voltage wave
Dynamic value and when, determine that the clamp capacitor is in the transient state.
10. clamp capacitor voltage control device according to claim 9, which is characterized in that the charge-discharge control unit
Include:
Second obtains subelement, for obtaining the previous charge and discharge switch vector state and clamp capacitor of the clamp capacitor
Target voltage；
Third determines subelement, for determining current clamper when the previous charge and discharge switch vector state is charged state
Capacitance object voltage is the difference of the target voltage and first voltage changing value；
4th determines subelement, for determining current clamper when the previous charge and discharge switch vector state is discharge condition
Capacitance object voltage be the target voltage and second voltage changing value and.
11. clamp capacitor voltage control device according to claim 10, which is characterized in that the charge-discharge control unit
Further include:
Third obtains subelement, for obtaining the previous charge and discharge switch vector state, the current charge and discharge switch vector
State and current clamp capacitor voltage；
5th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch vector
When state is charged state, and, the current clamp capacitor voltage is greater than the current clamp capacitor target voltage, determines institute
Stating target charge and discharge switch vector is discharge switch vector；
6th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch vector
When state is discharge condition, and, the current clamp capacitor voltage is less than the current clamp capacitor target voltage, determines institute
Stating target charge and discharge switch vector is charge switch vector；
7th determines subelement, for working as the previous charge and discharge switch vector state and the current charge and discharge switch vector
When state difference, determine that the target charge and discharge switch vector is the current charge and discharge switch vector state.
12. clamp capacitor voltage control device according to claim 10, which is characterized in that the charge-discharge control unit
Further include:
8th determines subelement, for being less than the current clamp capacitor target voltage and the when the current clamp capacitor voltage
The difference of one predetermined capacitive magnitude of a voltage fluctuation determines that the target charge and discharge switch vector is charge switch vector；
9th determines subelement, for being greater than the current clamp capacitor target voltage and the when the current clamp capacitor voltage
Two predetermined capacitive magnitude of a voltage fluctuation and when, determine the target charge and discharge switch vector be discharge switch vector.
13. a kind of multi-electrical level inverter, which is characterized in that including the clamp capacitor as described in any one of claim 7-12
Voltage-operated device.
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| CN201811435790.0A CN109474195B (en) | 2018-11-28 | 2018-11-28 | Clamp capacitor voltage control method, control device and multi-electrical level inverter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601026A (en) * | 2014-12-23 | 2015-05-06 | 安徽大学 | Suspended capacitor voltage control method of five-level ANPC (Active Neutral-Point-Clamped) converter |
| CN105262357A (en) * | 2015-09-28 | 2016-01-20 | 阳光电源股份有限公司 | Method and apparatus for controlling voltage of flying capacitor in multilevel inverter circuit |
| CN108258899A (en) * | 2017-12-29 | 2018-07-06 | 华为技术有限公司 | A kind of boost power translation circuit |
-
2018
- 2018-11-28 CN CN201811435790.0A patent/CN109474195B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601026A (en) * | 2014-12-23 | 2015-05-06 | 安徽大学 | Suspended capacitor voltage control method of five-level ANPC (Active Neutral-Point-Clamped) converter |
| CN105262357A (en) * | 2015-09-28 | 2016-01-20 | 阳光电源股份有限公司 | Method and apparatus for controlling voltage of flying capacitor in multilevel inverter circuit |
| CN108258899A (en) * | 2017-12-29 | 2018-07-06 | 华为技术有限公司 | A kind of boost power translation circuit |
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