Patent EP0543204A2 successfully refreshed from Google Patents.
EP0543204A2
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EP
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Electric power converter arrangement
Assignee: Hitachi Ltd
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Filing: 1992-11-02
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Granted: —
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Expires: 2012-11-02
Abstract
Abstract An electrical power converter arrangement including a converter of which one phase is constituted by positive side semiconductor switching elements (70, 71) connected in series and negative side semiconductor switching elements (72, 73) connected in series and which converts a DC voltage to an AC output phase voltage having three potential levels and a control unit for the converter which controls turn on and turn off of the semiconductor switching elements of the converter to operate the converter dependent upon a voltage amplitude command (E*) inputted to the control unit for a fundamental modulation wave (a1*) in a dipolar modulation mode in which the AC output phase voltage in a half cycle thereof is realized by alternating positive and negative output pulses and in a unipolar modulation mode in which the AC output phase voltage in a half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) wherein, transition between the dipolar modulation mode operation and the unipolar modulation mode operation is performed via a partial dipolar modulation mode in which the AC output phase voltage in a first period in a half cycle thereof is realized by alternating positive and negative output pulses and the AC output phase voltage in a second period in the half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) and the intervals of the first and second periods in the half cycle of the AC output phase voltage varies dependent upon the voltage amplitude command (E*) for the fundamental modulation wave (a1*), thereby the transition between the dipolar modulation mode operation and the unipolar modulation mode operation is smoothed and an inverter output voltage corresponding correctly to the fundamental modulation wave (a1*) is obtained.
Inventors
- 👤 Kiyoshi Nakata
- 👤 Tokunosuke Tanamachi
- 👤 Kiyoshi Nakamura
- 👤 Mutsuhiro Terunuma
- 👤 Masato Suzuki
- 👤 Yoshio Tsutsui
- 👤 Eiichi Toyota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:00
CPC Classifications
H; H02; H02M; H02M5/00; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/487; B; B60; B60L; B60L9/00; B60L9/16; B60L9/18; B60L9/22; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
268 words
An electrical power converter arrangement including a converter of which one phase is constituted by positive side semiconductor switching elements connected in series and negative side semiconductor switching elements connected in series and which converts a DC voltage to an AC output phase voltage having at least three potential levels and a control unit for said converter which controls turn on and turn off of the semiconductor switching elements of said converter to operate said converter dependent upon a voltage amplitude command (E*) inputted to said control unit for a fundamental modulation wave (a1*) in a first modulation mode in which the AC output phase voltage in a half cycle thereof is realized by alternating positive and negative output pulses and in a second modulation mode in which the AC output phase voltage in a half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) characterized in that, transition between the first modulation mode operation and the second modulation mode operation is performed via a third modulation mode in which the AC output phase voltage in a first period in a half cycle thereof is realized by alternating positive and negative output pulses and the AC output phase voltage in a second period in the half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) and the intervals of the first and second periods in the half cycle of the AC output phase voltage varies dependent upon the voltage amplitude command (E*) for the fundamental modulation wave (a1*).
Claim 2
Dependent Claim
155 words
An electrical power converter arrangement according to claim 1, wherein said control unit comprises a first means (1) for preparing the fundamental modulation wave (a1*) based upon the voltage amplitude command (E*) and frequency command (Fi*) to be outputted from said inverter, a second means (4, 20, 22, 23) for preparing a positive biased modulation wave (ap1*) and a negative biased modulation wave (an1*) dependent upon the voltage amplitude command (E*), a third means (24, 25, 26, 27, 28, 29) for preparing a positive side modulation wave (ap*) dependent upon the both positive and negative biased modulation waves (ap1*, an1*) and a negative side modulation wave (an*) dependent upon the both positive and negative biased modulation waves (ap1*, an1*) and a fourth means (3) for generating pulse width modulation pulse trains (S1, S2, S3, S4) for the semiconductor switching elements (70, 71, 72, 73) based upon the positive and negative side modulation waves (ap*, an*).
Claim 3
Dependent Claim
74 words
An electrical power converter arrangement according to claim 2, wherein said third means produces the positive side modulation wave (ap*) by adding a positive component of the negative biased modulation wave (an1*) to the positive component of the positive biased modulation wave (ap1*) and the negative side modulation wave (an*) by adding negative component of the positive biased modulation wave (ap1*) to the negative component of the negative biased modulation wave (an1*) (Fig.4, Fig.9).
Claim 4
Dependent Claim
124 words
An electrical power converter arrangement according to claim 2, wherein said third means suppresses outputting of the positive and negative side modulation wave (ap*, an*) below predetermined positive and negative values (d, -d) which produce a pulse having a width corresponding to the minimum on time of the semiconductor switching elements, and produces the positive side modulation wave (ap*) by adding a component of the negative biased modulation wave (an1*) above the predetermined negative value (-d) to the unsuppressed component of the positive biased modulation wave (ap1*) and the negative side modulation wave (an*) by adding a component of the positive biased modulation wave (ap1*) below the predetermined positive value (d) to the unsuppresed component of the negative biased modulation wave (an1*) (Fig.13, Fig.14).
Claim 5
Dependent Claim
62 words
An electrical power converter arrangement according to claim 2, wherein said fourth means are applied of reference clock signals CK for determining timing of the pulse generation (S1, S2, S3, S4) therefrom and the frequency of the reference clock signals CK is adapted to increase in accordance with the increase of the voltage amplitude command (E*) for the fundamental modulation wave (a1*).
Claim 6
Dependent Claim
362 words
An electric rolling stock control device comprising an electrical power converter arrangement converting a DC voltage to an AC output phase voltage having at least three potential levels and an AC motor driven by said electrical power converter arrangement, said electrical power converter arrangement including converter of which one phase is constituted by positive side semiconductor switching elements connected in series and negative side semiconductor switching elements connected in series and a control unit for said converter which controls turn on and turn off of the semiconductor switching elements of said converter to operate said converter dependent upon a voltage amplitude command (E*) inputted to said control unit for a fundamental moduration wave (a1*) in a first modulation mode in which the AC output phase voltage in a half cycle thereof is realized by alternating positive and negative output pulses, in a second modulation mode in which the AC output phase voltage in a half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*), in a fourth modulation mode in which the AC output phase voltage in a half cycle thereof is realized by reduced number of connected output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) and in a fifth modulation mode in which the AC output phase voltage in a half cycle thereof is realized by a single uninterrupted output pulse having the same polarity as the corresponding fundamental modulation wave (a1*) characterized in that, transition between the first modulation mode operation and the second modulation mode operation is performed via a third modulation mode in which the AC output phase voltage in a first period in a half cycle thereof is realized by alternating positive and negative output pulses and the AC output phase voltage in a second period in the half cycle thereof is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave (a1*) and the intervals of the first and second periods in the half cycle of the AC output phase voltage varies dependent upon the voltage amplitude command (E*) for the fundamental modulation wave (a1*).
Claim 7
Dependent Claim
155 words
An electric rolling stock control device according to claim 6, wherein said control unit comprises first means (1) for preparing the fundamental modulation wave (a1*) based upon the voltage amplitude command (E*) and frequency command (Fi*) to be outputted from said inverter, a second means (4, 20, 22, 23) for preparing a positive biased modulation wave (ap1*) and a negative biased modulation wave (an1*) dependent upon the voltage amplitude command (E*), a third means (24, 25, 26, 27, 28, 29) for preparing a positive side modulation wave (ap*) dependent upon the both positive and negative biased modulation waves (ap1*, an1*) and a negative side modulation wave (an*) dependent upon the both positive and negative biased modulation waves (ap1*, an1*) and a fourth means (3) for generating pulse width modulation pulse trains (S1, S2, S3, S4) for the semiconductor switching elements (70, 71, 72, 73) based upon the positive and negative side modulation waves (ap*, an*).
Claim 8
Dependent Claim
75 words
An electric rolling stock control device according to claim 7, wherein said third means produces the positive side modulation wave (ap*) by adding a positive component of the negative biased modulation wave (an1*) to the positive component of the positive biased modulation wave (ap1*) and the negative side modulation wave (an*) by adding negative component of the positive biased modulation wave (ap1*) to the negative component of the negative biased modulation wave (an1*) (Fig.4, Fig.9).
Claim 9
Dependent Claim
129 words
An electric rolling stock control device according to claim 7, wherein said third means suppresses outputting of the positive and negative side modulation wave (ap*, an*) below predetermined positive and negative values (d, -d) which produce a pulse having a width corresponding to the minimum on time of the semiconductor switching elements (70, 71, 72, 73), and produces the positive side modulation wave (ap*) by adding a component of the negative biased modulation wave (an1*) above the predetermined negative value (-d) to the unsuppressed component of the positive biased modulation wave (ap1*) and the negative side modulation wave (an*) by adding a component of the positive biased modulation wave (ap1*) below the predetermined positive value (d) to the unsuppresed component of the negative biased modulation wave (an1*) (Fig.13, Fig.14).
Claim 10
Dependent Claim
63 words
An electric rolling stock control device according to claim 7, wherein said fourth means are applied of reference clock signals (CK) for determining timing of the pulse generation (S1, S2, S3, S4) therefrom and the frequency of the reference clock signals (CK) is adapted to increase in accordance with the increase of the voltage amplitude command (E*) for the fundamental modulation wave (a1*).
References Cited (Backward Citations)
No citation records indexed.
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