Signal processor, filter, control circuit for power converter circuit, interconnection inverter system and pwm converter system
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 + jω 0 ) + F ( s - jω 0 ) 2 F ( s + jω 0 ) - F ( s - jω 0 ) 2 j - F ( s + jω 0 ) - F ( s - jω 0 ) 2 j F ( s + jω 0 ) + F ( s - jω 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ω 0 is a predetermined angular frequency and j is the imaginary unit.
Claims
exact text as granted — not AI-modified1 . A signal processor for generation of an output signal by performing signal processing to an input signal by a first transfer function, wherein the first transfer function is expressed by
G
1
(
s
)
=
F
(
s
+
j
ω
0
)
+
F
(
s
-
j
ω
0
)
2
where F(s) represents a transfer function expressing a predetermined process, ω 0 represents a predetermined angular frequency, and j represents an imaginary unit.
2 . A signal processor for an output of a first output signal and a second output signal in response to an input of a first input signal and a second input signal, wherein
the first input signal is processed by a first transfer function, the second input signal is processed by a second transfer function, and two results are added to obtain the first output signal, the first input signal is processed by a third transfer function, the second input signal is processed by the first transfer function, two results are added to obtain the second output signal, the first transfer function, the second transfer function and the third transfer function are expressed respectively by:
G
1
(
s
)
=
F
(
s
+
j
ω
0
)
+
F
(
s
-
j
ω
0
)
2
G
2
(
s
)
=
±
F
(
s
+
j
ω
0
)
-
F
(
s
-
j
ω
0
)
2
j
G
3
(
s
)
=
∓
F
(
s
+
j
ω
0
)
-
F
(
s
-
j
ω
0
)
2
j
where F(s) represents a transfer function expressing a predetermined process, ω 0 represents a predetermined angular frequency and j represents an imaginary unit.
3 . A signal processor for an output of a first output signal, a second output signal and a third output signal in response to an input of a first input signal, a second input signal and a third input signal, wherein
the first input signal is processed by a first transfer function, the second input signal is processed by a second transfer function, the third input signal is processed by the second transfer function, and three results are added to obtain the first output signal, the first input signal is processed by the second transfer function, the second input signal is processed by the first transfer function, the third input signal is process by the second transfer function, three results are added to obtain the second output signal, the first input signal is processed by the second transfer function, the second input signal is processed by the second transfer function, the third input signal is processed by the first transfer function, three results are added to obtain the third output signal, the first transfer function and the second transfer function are expressed by:
G
1
(
s
)
=
F
(
s
+
j
ω
0
)
+
F
(
s
-
j
ω
0
)
3
G
2
(
s
)
=
-
F
(
s
+
j
ω
0
)
+
F
(
s
-
j
ω
0
)
6
where F(s) represents a transfer function expressing a predetermined process, ω 0 representing a predetermined angular frequency, and j representing an imaginary unit.
4 . A signal processor for an output of a first output signal, a second output signal and a third output signal in response to an input of a first input signal, a second input signal and a third input signal, wherein
the first input signal is processed by a first transfer function, the second input signal is processed by a second transfer function, the third input signal is processed by a third transfer function and three results are added to obtain the first output signal, the first input signal is processed by the third transfer function, the second input signal is processed by the first transfer function, the third input signal is processed by the second transfer function, three results are added to obtain the second output signal, the first input signal is processed by the second transfer function, the second input signal is processed by the third transfer function, the third input signal is processed by the first transfer function, three results are added to obtain the third output signal, the first transfer function, the second transfer function and the third transfer function being expressed by:
G
1
(
s
)
=
F
(
s
+
j
ω
0
)
+
F
(
s
-
j
ω
0
)
3
G
2
(
s
)
=
(
-
1
∓
3
j
)
·
F
(
s
+
j
ω
0
)
+
(
-
1
±
3
j
)
·
F
(
s
-
j
ω
0
)
6
G
3
(
s
)
=
(
-
1
±
3
j
)
·
F
(
s
+
j
ω
0
)
+
(
-
1
∓
3
j
)
·
F
(
s
-
j
ω
0
)
6
where F(s) represents a transfer function expressing a predetermined process, ω 0 represents a predetermined angular frequency and j represents an imaginary unit.
5 . A control circuit for controlling a plurality of switching units inside a power converter circuit by a PWM signal, comprising:
a signal processor according to claim 1 ; and a PWM signal generator for generation of a PWM signal based on an output signal from the signal processor obtained by an input thereto of a signal based on an output from or as input to the power converter circuit.
6 . The control circuit according to claim 5 , further comprising a two-phase conversion unit for conversion of a signal based on an output from or an input to the power converter circuit into a first signal and a second signal, wherein
the PWM signal generator generates a PWM signal based on both an output signal obtained from an input of the first signal to the signal processor and an output signal obtained from an input of the second signal to the signal processor.
7 . A control circuit for controlling a plurality of switching units inside a power converter circuit by a PWM signal, comprising:
a two-phase conversion unit for conversion of a signal based on an output from or an input to the power converter circuit into a first signal and a second signal; the signal processor according to claim 2 ; and a PWM signal generator for generation of a PWM signal based on an output signal from the signal processor obtained by an input thereto of the first signal and the second signal.
8 . The control circuit according to claim 6 , wherein
the power converter circuit relates to a three-phase alternate current, and the two-phase conversion unit converts a signal based on a three-phase output from or three-phase input to the power converter circuit into the first signal and the second signal.
9 . The control circuit according to claim 6 , wherein
the power converter circuit relates to a single-phase alternate current, and the two-phase conversion unit generates a signal based on a single-phase output from or single-phase input to the power converter circuit as the first signal, and also generates a signal with a 90-degree phase delay from the first signal as the second signal.
10 . A control circuit for controlling a plurality of switching units inside a three-phase alternate-current related power converter circuit by a PWM signal, comprising:
a signal processor according to claim 3 ; and a PWM signal generator for generation of a PWM signal based on an output signal from the signal processor obtained by an input thereto of a signal based on an output from or an input to the power converter circuit.
11 . The control circuit according to claim 6 , wherein the signal processor is supplied with deviation signals representing deviation of the first signal and the second signal from their respective target values in place of the first signal and the second signal.
12 . The control circuit according to claim 5 , wherein the signal based on an output from or an input to the power converter circuit is a deviation signal provided by a deviation of said output from or said input to the power converter circuit from their respective target value.
13 . The control circuit according to claim 5 , wherein the predetermined angular frequency ω 0 is substituted for an angular frequency nω 0 provided by multiplying the angular frequency ω 0 by a natural number n.
14 . The control circuit according to claim 13 , further comprising:
a divergence determination unit for determination of a divergent tendency found in control, baaed on an output signal from the signal processor; and a stopping unit for stopping an output of the output signal upon determination of presence of the divergent tendency by the divergence determination unit.
15 . The control circuit according to claim 13 , further comprising:
a divergence determination unit for determination of a divergent tendency found in control, based on an output signal from the signal processor; and a phase change unit for changing a phase of the output signal upon determination of presence of the divergent tendency by the divergence determination unit.
16 . The control circuit according to claim 14 , wherein the divergence determination unit determines the presence of the divergent tendency in the control by a value of the output signal surpassing a predetermined threshold value.
17 . The control circuit according to claim 5 , wherein the predetermined process is given by a transfer function expressed as F(s)=K I /s, where K I represents an integral gain.
18 . The control circuit according to claim 5 , wherein the predetermined process is given by a transfer function expressed as F(s)=K P +K I /s, where K P and K I represent a proportional gain and an integral gain respectively.
19 . The control circuit according to claim 5 , wherein the signal based on an output from or an input to the power converter circuit is provided by a signal obtained by detection of an output current or an input current.
20 . The control circuit according to claim 5 , wherein the signal based on an output from or an input to the power converter circuit is provided by a signal obtained by detection of an output voltage or an input voltage.
21 . The control circuit according to claim 5 , wherein a H∞ loop shaping method is utilized in designing a control system.
22 . The control circuit according to claim 5 , wherein the power converter circuit is provided by an inverter circuit for generation of AC power to be supplied to an electrical power system,
the predetermined angular frequency ω 0 is provided by an angular frequency of a fundamental wave in the electrical power system.
23 . The control circuit according to claim 5 , wherein the power converter circuit comprises an inverter circuit for driving a motor,
the predetermined angular frequency ω 0 corresponds to a rotating speed of the motor.
24 . The control circuit according to claim 5 , wherein the power converter circuit comprises a converter circuit for conversion of AC power supplied from an electrical power system into DC power,
the predetermined angular frequency ω 0 corresponds to an angular frequency of a fundamental wave in the electrical power system.
25 . An interconnection inverter system comprising an inverter circuit and a control circuit according to claim 22 .
26 . A PWM converter system comprising a converter circuit and a control circuit according to claim 24 .
27 . A filter comprising a signal processor according to claim 1 ,
wherein the predetermined process is given by a transfer function expressed as F(s)=1/(T·s+1), where T represents a time constant.
28 . A filter comprising the signal processor according to claim 1 ,
wherein the predetermined process is given by a transfer function expressed as F(s)=T·s/(T·s+1), where T represents a time constant.
29 . A phase detector for detection of a phase of a fundamental wave component in an AC signal, comprising a filter according to claim 27 ,
wherein the predetermined angular frequency ω 0 corresponds to an angular frequency of a in a fundamental wave component the AC signal.
30 . A phase detector for detection of a phase of a fundamental wave component in an AC signal, comprising a filter according to claim 28 ,
wherein the predetermined angular frequency ω 0 corresponds to an angular frequency of a in a fundamental wave component the AC signal.Join the waitlist — get patent alerts
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