CN105429499B - A kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter - Google Patents
A kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter Download PDFInfo
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Abstract
The invention discloses a kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter, the modulator approach can effectively suppress the leakage current of two kinds of NPIC inverters provided by the invention, and the main points of its technical scheme are：First, NPIC inverters modulated signalSubtract each other to obtain modulated signal two-by-twoThen COEFFICIENT K is multiplied by respectively obtains modulated signalByZero sequence signal v is calculated through zero-sequence component0；WillRespectively with zero sequence signal v0Addition obtains modulated signalModulated signalWith triangular carrier VCLogical signal X, Y, Z are relatively obtained by comparator；X, Y, Z obtain the logical expression of switching signal by logical operation proposed by the present invention.Produced the beneficial effects of the invention are as follows switching signal by logical operation, implementation is simple.Solve the problems, such as that conventional multi-carrier modulation and space vector modulation realization are excessively complicated, while ensure that the common-mode voltage of system is constant, effectively inhibit leakage current.
Description
Technical field
The present invention relates to field of power electronics, more particularly to a kind of modulation of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter
Method, the modulator approach can effectively suppress the electric leakage of two kinds of non-isolation types three-phase tri-level photovoltaic DC-to-AC converter provided by the invention
Stream.
Background technology
Conventional photovoltaic inverter because it contains power frequency or high frequency transformer, make the volume of whole inverter is big, cost is high, effect
Rate is low.Non-isolation type photovoltaic DC-to-AC converter overcomes above technological deficiency, has become academic circles at present, the study hotspot of industrial quarters
One of.But due to parasitic capacitance between photovoltaic battery panel and the earth be present, the high frequency mo of inverter can be caused in parasitic capacitance
Larger leakage current is produced, causes grid-connected current distortion, threaten the problems such as personal security.Therefore, the suppression of leakage current turns into non-
One of key issue of isolated form photovoltaic combining inverter.
Chinese Patent Application No. is CN103078540A, entitled：A kind of more level photovoltaic inverters of three-phase striding capacitance
Modulator approach, this application case propose a kind of modulator approach for suppressing the more level photovoltaic inverter leakage currents of three-phase striding capacitance, led to
Cross analog circuit or digital circuit and single-carrier modulated is realized to three-phase Flying capacitor multilevel inverter, ensure that system common-mode
Voltage constant, effective suppression system leakage current.But this method is only applicable to striding capacitance type multi-electrical level inverter.Chinese patent Shen
Please number be CN104022669A, it is entitled：A kind of neutral point clamper photovoltaic DC-to-AC converter and its modulator approach, this application case propose one
Kind neutral point clamper photovoltaic DC-to-AC converter and its modulator approach, by improved space vector modulating method, i.e., according to reference voltage
Residing region of the vector under α β coordinate systems, select three adjacent middle vectors or two adjacent one null vectors of middle vector
Synthesized reference voltage vector is measured, effectively reduces the generation of system high-frequency leakage current.But this method simply subtracts to a certain extent
The small leakage current of system, and this method belongs to SVPWM, realizes more complicated.June-Seok Lee et al. were at 2013 the 28th
Publish an article Modulation technique to reduce leakage in IEEE power application electronics annual meetings
current in transformer-less photovoltaic systems using a three-level
inverter.Article proposes, by using " OOO " vector, middle vector, big Vector modulation reference voltage vector, makes common-mode voltage
It is basicly stable, reduce the leakage current of system.But this method belongs to SVPWM, and realization is more complicated, and common-mode voltage has small model
The change enclosed, this method can not effectively suppress leakage current.
The content of the invention
The shortcomings that to overcome prior art to exist, the present invention provide a kind of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter
Modulator approach, the modulator approach can effectively suppress two kinds of non-isolation types three-phase tri-level photovoltaic DC-to-AC converter provided by the invention
Leakage current.Two kinds of non-isolation types three-phase tri-level photovoltaic DC-to-AC converter provided by the invention, each phase of the inverter have four
The switching tube IGBT of controllable type is formed, and the midpoint of the electric capacity of DC side two is connected to by one of switching tube IGBT, therefore will
The inverter is named as IGBT neutral point clamp type inverters (Neutral-Point-IGBT-Clamped), referred to as NPIC.For
It is easy to explanation that two kinds of non-isolation type three-phase tri-level photovoltaic DC-to-AC converters are respectively designated as into NPIC1 inverters and NPIC2 inversions
Device.
The technical solution adopted by the present invention is：
Scheme one：
A kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter, the modulator approach are applied to NPIC1 inversions
Device, described NPIC1 inverters include the first controllable type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube
S3, the 4th controllable type switching tube S4, the 5th controllable type switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7、
8th controllable type switching tube S8, the 9th controllable type switching tube S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube
S11, the 12nd controllable type switching tube S12, the first electric capacity C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage connect
Two controllable type switching tube S2Colelctor electrode, its contact is defined as A points；Second controllable type switching tube S2Emitter stage to connect the 3rd controllable
Type switching tube S3Colelctor electrode, its contact is defined as D points；4th controllable type switching tube S4Emitter stage connect the 5th controllable type switch
Pipe S5Colelctor electrode, its contact is defined as B points；5th controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6's
Colelctor electrode, its contact are defined as E points；7th controllable type switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode,
Its contact is defined as C points；8th controllable type switching tube S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact
It is defined as F points；First electric capacity C1With the second electric capacity C2Concatenation, its contact are defined as O points, the first electric capacity C1Other end connection it is straight
The anode of side power supply is flowed, its tie point is defined as P points；Second electric capacity C2The other end connects the negative terminal of DC side power supply, and it is connected
Point is defined as N points；Tenth controllable type switching tube S10Colelctor electrode connection O points, its emitter stage connection D points；11st controllable type is opened
Close pipe S11Colelctor electrode connection O points, its emitter stage connection E points；12nd controllable type switching tube S12Colelctor electrode connection O points, its
Emitter stage connects F points；First controllable type switching tube S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th controllable
Type switching tube S7Colelctor electrode be all connected with P points；3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6Hair
Emitter-base bandgap grading and the 9th controllable type switching tube S9Emitter stage be all connected with N points；
Modulator approach specifically comprises the following steps：
(1) first, NPIC1 inverters three-phase modulations signalModulated signal is obtained by formula (1) COEFFICIENT K is multiplied by respectively obtains modulated signal
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signal
As shown in formula (2)；
(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal after comparator
X、Y、Z；
(5) to suppress the leakage current of NPIC1 inverters, voltage when selection NPIC1 powder inverter common-mode voltages are identical respectively
Working condition of the vector as inverter；According to selected working condition, the switching signal of switching tube is obtained on logical signal
X, Y, Z logical expression；Make g1-g12Represent the switching tube S of NPIC1 inverters1-S12Switching signal, then NPIC1 inverters
Switching signal g1-g12On logical signal X, Y, Z logical expression, as shown in formula (3),
According to the logical expression (3) of switching signal, the logic circuit of design generation switching signal or using live gate array
(FPGA) is arranged to realize.
Scheme two：
A kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter, the modulator approach are applied to NPIC2 inversions
Device, described NPIC2 inverters include the first controllable type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube
S3, the 4th controllable type switching tube S4, the 5th controllable type switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7、
8th controllable type switching tube S8, the 9th controllable type switching tube S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube
S11, the 12nd controllable type switching tube S12, the first electric capacity C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage connect
Two controllable type switching tube S2Colelctor electrode, its contact is defined as D points；Second controllable type switching tube S2Emitter stage to connect the 3rd controllable
Type switching tube S3Colelctor electrode, its contact is defined as A points；4th controllable type switching tube S4Emitter stage connect the 5th controllable type switch
Pipe S5Colelctor electrode, its contact is defined as E points；5th controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6's
Colelctor electrode, its contact are defined as B points；7th controllable type switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode,
Its contact is defined as F points；8th controllable type switching tube S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact
It is defined as C points；First electric capacity C1With the second electric capacity C2Concatenation, its contact are defined as O points, the first electric capacity C1Other end connection it is straight
The anode of side power supply is flowed, its tie point is defined as P points；Second electric capacity C2The other end connection DC side power supply negative terminal, its connect
Contact is defined as N points；Tenth controllable type switching tube S10Emitter stage connection O points, its colelctor electrode connection D points；11st controllable type
Switching tube S11Emitter stage connection O points, its colelctor electrode connection E points；12nd controllable type switching tube S12Emitter stage connection O points,
Its colelctor electrode connects F points；First controllable type switching tube S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th can
Control type switching tube S7Colelctor electrode be all connected with P points；3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6's
Emitter stage and the 9th controllable type switching tube S9Emitter stage be all connected with N points；
Modulator approach specifically comprises the following steps：
(1) first, NPIC2 inverters three-phase modulations signalModulated signal is obtained by formula (1)COEFFICIENT K is multiplied by respectively obtains modulated signal
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signal
As shown in formula (2)；
(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal after comparator
X、Y、Z；
(5) to suppress the leakage current of NPIC2 inverters, voltage when selection NPIC2 powder inverter common-mode voltages are identical respectively
Working condition of the vector as inverter；According to selected working condition, the switching signal of switching tube is obtained on logical signal
X, Y, Z logical expression；Make g1-g12Represent the switching tube S of NPIC2 inverters1-S12Switching signal, then NPIC2 inverters
Switching signal g1-g12On logical signal X, Y, Z logical expression, as shown in formula (4),
According to the logical expression (4) of switching signal, the logic circuit of design generation switching signal or using live gate array
(FPGA) is arranged to realize.
Due to using above-mentioned technical proposal, compared with prior art, the beneficial effects of the invention are as follows：
The common-mode voltage of (1) two kind of NPIC inverter keeps constant, effectively inhibits the leakage current of two kinds of inverters, improves
The quality of the output waveform of two kinds of inverters；
(2) modulator approach proposed by the present invention, NPIC inverter switching device pipes are obtained by logical operation and digital circuit
Switching signal, modulator approach are easily realized.
Brief description of the drawings
Fig. 1 is NPIC1 inverter topologies figure corresponding with scheme one provided by the invention；
Fig. 2 is the schematic diagram of scheme one provided by the invention；
Fig. 3 is NPIC2 inverter topologies figure corresponding with scheme two provided by the invention；
Fig. 4 is the schematic diagram of scheme two provided by the invention.
Embodiment
Modulator approach proposed by the present invention is further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is NPIC1 inverter topologies figure provided by the invention, and it is controllable that described NPIC1 inverters include first
Type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube S3, the 4th controllable type switching tube S4, the 5th controllable type
Switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7, the 8th controllable type switching tube S8, the 9th controllable type opens
Close pipe S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube S11, the 12nd controllable type switching tube S12, the first electric capacity
C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage meet the second controllable type switching tube S2Colelctor electrode, its contact determines
Justice is A points；Second controllable type switching tube S2Emitter stage meet the 3rd controllable type switching tube S3Colelctor electrode, its contact is defined as D
Point；4th controllable type switching tube S4Emitter stage meet the 5th controllable type switching tube S5Colelctor electrode, its contact is defined as B points；5th
Controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6Colelctor electrode, its contact is defined as E points；7th controllable type
Switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode, its contact is defined as C points；8th controllable type switching tube
S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact is defined as F points；First electric capacity C1With the second electric capacity C2
Concatenation, its contact are defined as O points, the first electric capacity C1Other end connection DC side power supply anode, its tie point is defined as P
Point；Second electric capacity C2Other end connection DC side power supply negative terminal, its tie point is defined as N points；Tenth controllable type switching tube
S10Colelctor electrode connection O points, its emitter stage connection D points；11st controllable type switching tube S11Colelctor electrode connection O points, its launch
Pole connects E points；12nd controllable type switching tube S12Colelctor electrode connection O points, its emitter stage connection F points；First controllable type switchs
Pipe S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th controllable type switching tube S7Colelctor electrode be all connected with P points；
3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6Emitter stage and the 9th controllable type switching tube S9Hair
Emitter-base bandgap grading is all connected with N points.
Fig. 2 provides modulation principle figure of the modulator approach applied to NPIC1 inverters for the present invention.
NPIC1 inverters with reference to shown in Fig. 1, modulator approach provided by the invention specifically comprise the following steps：
(1) first, the modulated signal of NPIC1 invertersModulated signal is obtained by formula (1) COEFFICIENT K is multiplied by respectively obtains modulated signal
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signal
As shown in formula (2)；
(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal after comparator
X、Y、Z；
(5) the NPIC1 inverters shown in accompanying drawing 1 share 27 kinds of voltage vector states, effectively to suppress NPIC1 inverters
Leakage current, choose the powder inverter common-mode voltage it is identical when voltage vector be listed in table 1.From table 1,8 kinds of on off states can divide
For 2 classes：(1) logical signal X, Y, Z is all " 0 " or is all " 1 ", as shown in the first row of table 1 and the 8th row, two kinds of working conditions
The switching signal of corresponding each switching tube is consistent, the U under two kinds of working conditionsAN=UBN=UCN=E/2.Therefore, logical signal X, Y,
Common-mode voltage U when Z is all " 0 " or is all " 1 "CM=(UAN+UBN+UCN)/3=E/2；(2) logical signal X, Y, Z such as tables 1
Shown in two rows to the 7th row, common-mode voltage UAN、UBN、UCNThere are three kinds of possible values, respectively E, E/2,0.For example, work as X=1,
Y=Z=0, corresponding NPIC1 inverter switching states are as shown in the row of table 1 second, the U under this working conditionAN=E, UBN=E/
2,UCN=0, therefore UCM=(UAN+UBN+UCN)/3=E/2.The third line in table 1 similarly be can obtain to the common-mode voltage of the 7th row
For E/2.Therefore, when NPIC1 inverters are operated in eight kinds of working conditions shown in table 1, common-mode voltage is constant, and leakage current obtains
Effectively suppress.
Modulator approach provided by the invention establishes each switching signal by the logical operation 1 in modulation principle figure shown in Fig. 2
With X, Y, Z logical relation, the NPIC1 inverters shown in accompanying drawing 1 are made to be operated in the on off state shown in table 1, logical operation 1 is logical
Cross formula (3) realization.According to table 1, the switching signal that switching tube is obtained using modulator approach proposed by the present invention is believed on logic
Number X, Y, Z logical expression, as shown in Equation 3.
For NPIC1 inverters, modulator approach provided by the invention obtains using logic by the logical operation shown in formula 3
The switching signal that signal X, Y, Z are represented so that NPIC1 inverters are operated in eight kinds of constant states of common-mode voltage shown in table 1,
So as to effectively suppress leakage current.
Fig. 3 be with NPIC2 inverter topologies figure provided by the invention, described NPIC2 inverters can including first
Control type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube S3, the 4th controllable type switching tube S4, it is the 5th controllable
Type switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7, the 8th controllable type switching tube S8, the 9th controllable type
Switching tube S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube S11, the 12nd controllable type switching tube S12, first electricity
Hold C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage meet the second controllable type switching tube S2Colelctor electrode, its contact
It is defined as D points；Second controllable type switching tube S2Emitter stage meet the 3rd controllable type switching tube S3Colelctor electrode, its contact is defined as A
Point；4th controllable type switching tube S4Emitter stage meet the 5th controllable type switching tube S5Colelctor electrode, its contact is defined as E points；5th
Controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6Colelctor electrode, its contact is defined as B points；7th controllable type
Switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode, its contact is defined as F points；8th controllable type switching tube
S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact is defined as C points；First electric capacity C1With the second electric capacity C2
Concatenation, its contact are defined as O points, the first electric capacity C1Other end connection DC side power supply anode, its tie point is defined as P
Point；Second electric capacity C2Other end connection DC side power supply negative terminal, its tie point is defined as N points；Tenth controllable type switching tube
S10Emitter stage connection O points, its colelctor electrode connection D points；11st controllable type switching tube S11Emitter stage connection O points, its current collection
Pole connects E points；12nd controllable type switching tube S12Emitter stage connection O points, its colelctor electrode connection F points；First controllable type switchs
Pipe S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th controllable type switching tube S7Colelctor electrode be all connected with P points；
3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6Emitter stage and the 9th controllable type switching tube S9Hair
Emitter-base bandgap grading is all connected with N points.
Fig. 4 provides modulation principle figure of the modulator approach applied to NPIC2 inverters for the present invention.
NPIC2 inverters with reference to shown in Fig. 3, modulator approach provided by the invention specifically comprise the following steps：
(1) first, the modulated signal of NPIC2 invertersModulated signal is obtained by formula (1) COEFFICIENT K is multiplied by respectively obtains modulated signal
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signal
As shown in formula (2)；
(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal after comparator
X、Y、Z；
(5) the NPIC2 inverters shown in accompanying drawing 3 share 27 kinds of voltage vector states, effectively to suppress the leakage of NPIC2 inverters
Electric current, choose the inverter common-mode voltage it is identical when voltage vector be listed in table 2.From table 2,8 kinds of on off states can divide
For 2 classes：(1) logical signal X, Y, Z is all " 0 " or is all " 1 ", as shown in the first row of table 2 and the 8th row, two kinds of working conditions
The switching signal of corresponding each switching tube is consistent, the U under two kinds of working conditionsAN=UBN=UCN=E/2.Therefore, logical signal X, Y,
Common-mode voltage U when Z is all " 0 " or is all " 1 "CM=(UAN+UBN+UCN)/3=E/2；(2) logical signal X, Y, Z such as tables 2
Shown in two rows to the 7th row, common-mode voltage UAN、UBN、UCNThere are three kinds of possible values, respectively E, E/2,0.For example, work as X=1,
Y=Z=0, corresponding NPIC2 inverter switching states are as shown in the row of table 2 second, the U under this working conditionAN=E, UBN=E/
2,UCN=0, therefore UCM=(UAN+UBN+UCN)/3=E/2.The third line in table 2 similarly be can obtain to the common-mode voltage of the 7th row
Constant is E/2.Therefore, when NPIC2 inverters are operated in eight kinds of working conditions shown in table 2, common-mode voltage is constant, leakage current
It is effectively suppressed.
Modulator approach provided by the invention by the logical operation 2 in modulation principle figure shown in Fig. 4 establish switching signal with
X, Y, Z logical relation, makes the inverter shown in accompanying drawing 3 be operated in the on off state shown in table 2, and logical operation 2 passes through formula
(4) realize.According to table 2, the switching signal of switching tube is obtained on logical signal X, Y, Z using modulator approach proposed by the present invention
Logical expression, as shown in Equation 4.
For NPIC2 inverters, modulator approach provided by the invention obtains using logic by the logical operation shown in formula 4
The switching signal that signal X, Y, Z are represented so that NPIC2 inverters are operated in eight kinds of constant states of common-mode voltage shown in table 2,
So as to effectively suppress leakage current.
The on off state when common-mode voltage of the NPIC1 inverters of table 1 is constant
The on off state when common-mode voltage of the NPIC2 inverters of table 2 is constant
Claims (2)
1. a kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter, the modulator approach is applied to NPIC1 inverters,
Described NPIC1 inverters include the first controllable type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube S3、
4th controllable type switching tube S4, the 5th controllable type switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7,
Eight controllable type switching tube S8, the 9th controllable type switching tube S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube S11、
12nd controllable type switching tube S12, the first electric capacity C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage connect second can
Control type switching tube S2Colelctor electrode, its contact is defined as A points；Second controllable type switching tube S2Emitter stage connect the 3rd controllable type and open
Close pipe S3Colelctor electrode, its contact is defined as D points；4th controllable type switching tube S4Emitter stage meet the 5th controllable type switching tube S5
Colelctor electrode, its contact is defined as B points；5th controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6Current collection
Pole, its contact are defined as E points；7th controllable type switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode, it connects
Point is defined as C points；8th controllable type switching tube S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact definition
For F points；First electric capacity C1With the second electric capacity C2Concatenation, its contact are defined as O points, the first electric capacity C1The other end connection DC side
The anode of power supply, its tie point are defined as P points；Second electric capacity C2The other end connects the negative terminal of DC side power supply, and its tie point is determined
Justice is N points；Tenth controllable type switching tube S10Colelctor electrode connection O points, its emitter stage connection D points；11st controllable type switching tube
S11Colelctor electrode connection O points, its emitter stage connection E points；12nd controllable type switching tube S12Colelctor electrode connection O points, its launch
Pole connects F points；First controllable type switching tube S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th controllable type open
Close pipe S7Colelctor electrode be all connected with P points；3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6Emitter stage
With the 9th controllable type switching tube S9Emitter stage be all connected with N points；
Modulator approach specifically comprises the following steps：
(1) first, NPIC1 inverters three-phase modulations signalModulated signal is obtained by formula (1) COEFFICIENT K is multiplied by respectively obtains modulated signal
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<mi>b</mi>
<mo>*</mo>
</msubsup>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
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<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signalSuch as formula
(2) shown in；
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<mo>*</mo>
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(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal X, Y, Z after comparator；
(5) to suppress the leakage current of NPIC1 inverters, voltage vector when selection NPIC1 powder inverter common-mode voltages are identical respectively
Working condition as inverter；According to selected working condition, the switching signal of switching tube is obtained on logical signal X, Y, Z
Logical expression；Make g1-g12Represent the switching tube S of NPIC1 inverters1-S12Switching signal, then NPIC1 inverters open
OFF signal g1-g12On logical signal X, Y, Z logical expression, as shown in formula (3),
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According to the logical expression (3) of switching signal, the logic circuit of design generation switching signal or real using live gate array
It is existing.
2. a kind of modulator approach of non-isolation type three-phase tri-level photovoltaic DC-to-AC converter, the modulator approach is applied to NPIC2 inverters,
Described NPIC2 inverters include the first controllable type switching tube S1, the second controllable type switching tube S2, the 3rd controllable type switching tube S3、
4th controllable type switching tube S4, the 5th controllable type switching tube S5, the 6th controllable type switching tube S6, the 7th controllable type switching tube S7,
Eight controllable type switching tube S8, the 9th controllable type switching tube S9, the tenth controllable type switching tube S10, the 11st controllable type switching tube S11、
12nd controllable type switching tube S12, the first electric capacity C1With the second electric capacity C2；First controllable type switching tube S1Emitter stage connect second can
Control type switching tube S2Colelctor electrode, its contact is defined as D points；Second controllable type switching tube S2Emitter stage connect the 3rd controllable type and open
Close pipe S3Colelctor electrode, its contact is defined as A points；4th controllable type switching tube S4Emitter stage meet the 5th controllable type switching tube S5
Colelctor electrode, its contact is defined as E points；5th controllable type switching tube S5Emitter stage meet the 6th controllable type switching tube S6Current collection
Pole, its contact are defined as B points；7th controllable type switching tube S7Emitter stage meet the 8th controllable type switching tube S8Colelctor electrode, it connects
Point is defined as F points；8th controllable type switching tube S8Emitter stage meet the 9th controllable type switching tube S9Colelctor electrode, its contact definition
For C points；First electric capacity C1With the second electric capacity C2Concatenation, its contact are defined as O points, the first electric capacity C1The other end connection DC side
The anode of power supply, its tie point are defined as P points；Second electric capacity C2The other end connection DC side power supply negative terminal, its tie point
It is defined as N points；Tenth controllable type switching tube S10Emitter stage connection O points, its colelctor electrode connection D points；11st controllable type switchs
Pipe S11Emitter stage connection O points, its colelctor electrode connection E points；12nd controllable type switching tube S12Emitter stage connection O points, its collect
Electrode connects F points；First controllable type switching tube S1Colelctor electrode, the 4th controllable type switching tube S4Colelctor electrode and the 7th controllable type
Switching tube S7Colelctor electrode be all connected with P points；3rd controllable type switching tube S3Emitter stage, the 6th controllable type switching tube S6Transmitting
Pole and the 9th controllable type switching tube S9Emitter stage be all connected with N points；
Modulator approach specifically comprises the following steps：
(1) first, NPIC2 inverters three-phase modulations signalModulated signal is obtained by formula (1)COEFFICIENT K is multiplied by respectively obtains modulated signal
(2) byZero sequence signal v is calculated through zero-sequence component0；
(3) willRespectively with zero sequence signal v0Addition obtains modulated signalSuch as formula
(2) shown in；
(4) modulated signalRespectively with triangular carrier VCBy obtaining logical signal X, Y, Z after comparator；
(5) to suppress the leakage current of NPIC2 inverters, voltage vector when selection NPIC2 powder inverter common-mode voltages are identical respectively
Working condition as inverter；According to selected working condition, the switching signal of switching tube is obtained on logical signal X, Y, Z
Logical expression；Make g1-g12Represent the switching tube S of NPIC2 inverters1-S12Switching signal, then NPIC2 inverters open
OFF signal g1-g12On logical signal X, Y, Z logical expression, as shown in formula (4),
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<mi>Z</mi>
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<msub>
<mi>g</mi>
<mn>9</mn>
</msub>
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<mi>X</mi>
<mover>
<mi>Z</mi>
<mo>&OverBar;</mo>
</mover>
<mo>,</mo>
<msub>
<mi>g</mi>
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</msub>
<mo>=</mo>
<mover>
<mi>X</mi>
<mo>&OverBar;</mo>
</mover>
<mover>
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<mo>&OverBar;</mo>
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<mi>X</mi>
<mi>Z</mi>
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</mtr>
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<mo>-</mo>
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<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
According to the logical expression (4) of switching signal, the logic circuit of design generation switching signal or real using live gate array
It is existing.
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