A method of decoupling a three-phase converter

Claim 1

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of the output frequency comprising: (a) supplying input current and voltage of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system; (c) time sampling said current and voltage signals; (d) decoupling said current and voltage signals; (e) inverse transforming said current and voltage signals into the u-v-w coordinate system thereby generating a three phase output signal of frequency f; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 2

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of the output frequency comprising: (a) supplying input current and voltage of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system; (c) time sampling said current and voltage signals; (d) decoupling said current and voltage signals; (e) inverse transforming said current and voltage signals into the u-v-w coordinate system thereby generating a three phase output signal of frequency f; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 7

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU32## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal S 1 =col(S 1u , S 1v , S 1w ) to said current and voltage signals, where ##EQU33## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 ; and (e) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 8

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU32## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal S 1 =col(S 1u , S 1v , S 1w ) to said current and voltage signals, where ##EQU33## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 ; and (e) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 9

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU34## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal and S 2 =col(S 2u , S 2v , S 2w ) to said current and voltage signals, where ##EQU35## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 , S u2 , S v2 ; and (e) generating control signals S u3 =S u1 +S u2 and S v3 =S v1 +S v2 ; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 10

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU34## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal and S 2 =col(S 2u , S 2v , S 2w ) to said current and voltage signals, where ##EQU35## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 , S u2 , S v2 ; and (e) generating control signals S u3 =S u1 +S u2 and S v3 =S v1 +S v2 ; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 11

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU36## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal S 1 =col(S 1u , S 1v , S 1w ) to said current and voltage signals, where ##EQU37## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 ; (e) generating control signals S u5 =S u1 -S u4 and S v5 =S v1 -S v4 ; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.

Claim 12

A method of operating a three-phase converter producing an output signal at an output frequency f from input power at a different, first frequency, including direct current, wherein the input power is switched a plurality of times within one cycle of output frequency comprising: (a) supplying input current and voltage signals of a first frequency from a signal generating means including switching elements; (b) transforming said voltage and current signals into the d-q coordinate system by multiplying said current and voltage signals by a matrix C, where ##EQU36## (c) time sampling said current and voltage signals by taking the Z-transform of said signals; (d) decoupling and inverse transforming said current and voltage signals by applying a control signal S 1 =col(S 1u , S 1v , S 1w ) to said current and voltage signals, where ##EQU37## thereby generating respective phase output voltages in correspondence with the signals S u1 , S v1 ; (e) generating control signals S u5 =S u1 -S u4 and S v5 =S v1 -S v4 ; and (f) pulse width modulating said phase output signals and feeding the modulated phase output signals back into the signal generating means to activate the switching elements of said signal generating means.