Signal processor, filter, control circuit for power converter circuit, interconnection inverter system and PWM converter system
AssigneeDAIHEN Corporation
InventorsAkihiro Ohori, Nobuyuki Hattori
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Abstract
A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ( s + j ω 0 ) + F ( s - j ω 0 ) 2 F ( s + j ω 0 ) - F ( s - j ω 0 ) 2 j - F ( s + j ω 0 ) - F ( s - j ω 0 ) 2 j F ( s + j ω 0 ) + F ( s - j ω 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ω0 is a predetermined angular frequency and j is the imaginary unit.
Claims12
A signal processor comprising:
- a signal processing circuit configured to perform linear time-invariant signal processing equivalent to conventional non-linear time-variant signal processing with respect to a first input signal S1, a second input signal S2 and a third input signal S3, the conventional processing including:
- fixed-to-rotating coordinate conversion based on a non-zero target angular frequency ω;
- intermediate processing by a transfer function F(s) subsequent to the fixed-to-rotating coordinate conversion;
- and inverse conversion of the fixed-to-rotating coordinate conversion subsequent to the intermediate processing, the transfer function F(s) corresponding to an impulse response of the intermediate processing,
- wherein the signal processing circuit is configured to convert the first input signal S1, the second input signal S2 and the third input signal S3 to a first output signal C1, a second output signal C2 and a third output signal C3 by an equation below involving a first transfer function G1(s) and a second transfer function G2(s),
- (
- G
- 1
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 1
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 2
-
- (
- s
- )
- G
- 1
-
- (
- s
- )
- )
-
- (
- S
- 1
- S
- 2
- S
- 3
- )
- =
- (
- C
- 1
- C
- 2
- C
- 3
- )
- wherein G1(s) and G2(s) are represented by following formulas, where G1(s)≠0 and j represents an imaginary unit,
- G
- 1
-
- (
- s
- )
- =
- F
-
- (
- s
- +
- j
-
-
- ω
- )
- +
- F
-
- (
- s
- -
- j
-
-
- ω
- )
- 3
- G
- 2
-
- (
- s
- )
- =
- -
- F
-
- (
- s
- +
- j
-
-
- ω
- )
- +
- F
-
- (
- s
- -
- j
-
-
- ω
- )
- 6
Dependencies are inferred from the claim text.