| US 7,450,405 B2 | ||
| DC/AC converter with dampened LCL filter distortions | ||
| Srinivas Ponnaluri, Untersiggenthal (Switzerland); and Leonardo Serpa, Zürich (Switzerland) | ||
| Assigned to ABB Schweiz AG, Baden (Switzerland) | ||
| Filed on Jul. 24, 2007, as Appl. No. 11/878,418. | ||
| Application 11/878418 is a continuation of application No. PCT/CH2005/000292, filed on May 24, 2005. | ||
| Claims priority of provisional application 60/646504, filed on Jan. 25, 2005. | ||
| Prior Publication US 2008/0007974 A1, Jan. 10, 2008 | ||
| Int. Cl. H02M 1/12 (2006.01) | ||
| U.S. Cl. 363—40 [363/98] | 16 Claims |
| 9. An apparatus for carrying out a method for operating a converter circuit, with the converter circuit having a converter
unit with a plurality of drivable power semiconductor switches and an LCL filter connected to each phase connection of the
converter unit,
having a control device which is used for producing a hysteresis power value, a hysteresis wattless component value and a
selected flux sector and is connected to the drivable power semiconductor switches via a drive circuit in order to form a
drive signal,
wherein the control device has
a first calculation unit for forming the hysteresis power value, the hysteresis wattless component value and the selected
flux sector, with the first calculation unit having a first hysteresis regulator for forming the hysteresis power value from
a difference power value, a second hysteresis regulator for forming the hysteresis wattless component value from a difference
wattless component value and a vector allocator for forming the selected flux sector,
a first adder for forming the difference power value from the subtraction of an estimated power value and of a damping power
value from a reference power value,
a second adder for forming the difference wattless component value from the subtraction of an estimated wattless component
value and of a damping wattless component value from a reference wattless component value,
a second calculation unit for forming the damping power value and the damping wattless component value, with the damping power
value being formed from a sum, weighted by a variable damping factor, of a multiplication of an α component of the space vector
transformation of filter capacitance currents (icfα) of the LCL filters by an α component of the space vector transformation of phase connection currents (ifia), and a multiplication of a β component of the space vector transformation of filter capacitance currents (iCfβ) of the LCL filter by a β component of the space vector transformation of phase connection currents (ifiβ), and the damping wattless component value being formed from a difference, weighted by the variable damping factor, of a
multiplication of the β component of the space vector transformation of filter capacitance currents (icfβ) of the LCL filters by the α component of the space vector transformation of phase connection currents (ifiα) and a multiplication of the α component of the space vector transformation of filter capacitance currents (iCfα) of the LCL filters by the β component of the space vector transformation of phase connection currents (ifiβ).
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