Voltage control of an HR-PMG without a rotor position sensor

Claim 2

An electrical power generation system comprising: an electric power source adapted for providing AC power; a power converter connected to said electric power source; a position estimator receiving a current feedback signal in Park vector format and providing a synchronous reference frame; and a controller configured to provide a voltage command for controlling said power converter, said controller receiving said current feedback signal and a current reference in Park vector format and using said synchronous reference frame, said current feedback signal, and said current reference to produce said voltage command.

Claim 3

The electrical power system of claim 1 wherein said power source comprises a high reactance, permanent magnet generator configured such that the short circuit current and the rated current of said high reactance, permanent magnet generator are approximately equal.

Claim 4

The electrical power system of claim 1 wherein said position estimator comprises: a multiplier configured to multiply said current feedback signal in Park vector format by a negative estimate of a transformation angle θ in Park vector format to provide a synchronous frame signal, a PI-regulator configured to regulate said synchronous frame signal compared to zero to provide an estimated electrical frequency; and an integrator configured to integrate said estimated electrical frequency so as to provide said negative estimate of said transformation angle θ to said multiplier and to provide said transformation angle θ to said controller, whereby said position estimator provides said synchronous reference frame to said controller.

Claim 5

The electrical power system of claim 1 wherein said controller comprises: a first conversion block for providing said current feedback signal in Park vector format in said synchronous reference frame; a second conversion block for providing said current reference in Park vector format in said synchronous reference frame; a comparator using said current feedback signal and said current reference in said synchronous reference frame to provide a command; and a PI-regulator regulating said command to produce said voltage command.

Claim 6

The electrical power system of claim 1 , further comprising a space vector modulation module, said space vector modulation module receiving said voltage command and providing control signals to said power converter.

Claim 7

The electrical power system of claim 1 , further comprising a plurality of current sensors, said plurality of current sensors disposed for sensing an AC current between said electric power source and said power converter, and for providing said current feedback signal.

Claim 8

The electrical power system of claim 1 wherein said current reference comprises an angle component and an amplitude component.

Claim 9

The electrical power system of claim 7 , further comprising: a DC link voltage sensor for sensing a DC link voltage output of said power converter and providing a DC link voltage feed back signal; a comparator receiving said DC link voltage feed back signal and a DC link voltage command signal, and producing a DC link voltage error signal; and a PI-regulator regulating said DC link voltage error signal to produce a DC link voltage angle component, wherein said angle component of said current reference comprises said DC link voltage angle component and whereby said controller controls said DC link voltage output of said power converter.

Claim 10

The electrical power system of claim 8 further comprising: a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; a feedforward function module configured to receive said load current signal and produce a feedforward angle component; and a combiner configured to combine said DC link voltage angle component and said feedforward angle component so that said angle component of said current reference comprises said feedforward angle component whereby a gain sensitivity of said angle component of said current reference is minimized.

Claim 11

The electrical power system of claim 7 , further comprising: a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; and a non-linear function generator configured to receive said load current signal and produce said amplitude component of said current reference, whereby said controller controls said DC current output of said power converter.

Claim 12

An electrical power system comprising: an electric power source comprising a high reactance generator adapted for providing AC power; a power converter connected to said electric power source; a plurality of current sensors, said plurality of current sensors disposed for sensing an AC current between said electric power source and said power converter, and for providing a current feedback signal; a position estimator receiving said current feedback signal in Park vector format and providing a synchronous reference frame, wherein said position estimator comprises: a multiplier configured to multiply said current feedback signal in Park vector format by a negative estimate of a transformation angle θ in Park vector format to provide a synchronous frame signal; a PI-regulator configured to regulate said synchronous frame signal compared to zero to provide an estimated electrical frequency; and an integrator configured to integrate said estimated electrical frequency so as to provide said negative estimate of said transformation angle θ to said multiplier and to provide said transformation angle θ to said controller, whereby said position estimator provides said synchronous reference frame to said controller; a controller configured to provide a voltage command for controlling said power converter, said controller receiving said current feedback signal and a current reference in Park vector format and using said synchronous reference frame, said current feedback signal, and said current reference to produce said voltage command; and a space vector modulation module, said space vector modulation module receiving said voltage command and providing control signals to said power converter.

Claim 13

An electrical power system comprising: an electric power source comprising a high reactance generator adapted for providing AC power; a power converter connected to said electric power source; a plurality of current sensors, said plurality of current sensors disposed for sensing an AC current between said electric power source and said power converter, and for providing a current feedback signal; a position estimator receiving said current feedback signal in Park vector format and providing a synchronous reference frame, wherein said position estimator comprises: a multiplier configured to multiply said current feedback signal in Park vector format by a negative estimate of a transformation angle θ in Park vector format to provide a synchronous frame signal; a PI-regulator configured to regulate said synchronous frame signal compared to zero to provide an estimated electrical frequency; and an integrator configured to integrate said estimated electrical frequency so as to provide said negative estimate of said transformation angle θ to said multiplier and to provide said transformation angle θ to said controller, whereby said position estimator provides said synchronous reference frame to said controller; a controller configured to provide a voltage command for controlling said power converter, said controller receiving said current feedback signal and a current reference in Park vector format and using said synchronous reference frame, said current feedback signal, and said current reference to produce said voltage command; and a space vector modulation module, said space vector modulation module receiving said voltage command and providing control signals to said power converter.

Claim 14

The electrical power system of claim 11 wherein said high reactance generator comprises a high reactance, permanent magnet generator designed such that the short circuit current is approximately equal to the rated current.

Claim 15

The electrical power system of claim 11 wherein said controller comprises: a first conversion block for providing said current feedback signal in Park vector format in said synchronous reference frame; a second conversion block for providing said current reference in Park vector format in said synchronous reference frame; a comparator using said current feedback signal and said current reference in said synchronous reference frame to provide a command; and a PI-regulator regulating said command to produce said voltage command.

Claim 16

The electrical power system of claim 11 wherein said current reference comprises an angle component and an amplitude component.

Claim 17

The electrical power system of claim 14 , further comprising: a DC link voltage sensor for sensing a DC link voltage output of said power converter and providing a DC link voltage feed back signal; a comparator receiving said DC link voltage feed back signal and a DC link voltage command signal, and producing a DC link voltage error signal; and a PI-regulator regulating said DC link voltage error signal to produce a DC link voltage angle component, wherein said angle component of said current reference comprises said DC link voltage angle component and whereby said controller controls said DC link voltage output of said power converter.

Claim 18

The electrical power system of claim 15 further comprising: a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; a feedforward function module configured to receive said load current signal and produce a feedforward angle component; and a combiner configured to combine said DC link voltage angle component and said feedforward angle component so that said angle component of said current reference comprises said feedforward angle component whereby a gain sensitivity of said angle component of said current reference is minimized.

Claim 19

The electrical power system of claim 14 , further comprising: a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; and a non-linear function generator configured to receive said load current signal and produce said amplitude component of said current reference, whereby said controller controls said DC current output of said power converter.

Claim 20

An electrical power system comprising: an electric power source comprising a high reactance permanent magnet generator adapted for providing AC power at varying power factors; a power converter connected to said electric power source; a plurality of current sensors, said plurality of current sensors disposed for sensing an AC current between said electric power source and said power converter, and for providing a current feedback signal; a position estimator receiving said current feedback signal in Park vector format and providing a synchronous reference frame, wherein said position estimator comprises: a multiplier configured to multiply said current feedback signal in Park vector format by a negative estimate of a transformation angle e in Park vector format to provide a synchronous frame signal; a first PI-regulator configured to regulate said synchronous frame signal compared to zero to provide an estimated electrical frequency; and an integrator configured to integrate said estimated electrical frequency so as to provide said negative estimate of said transformation angle θ to said multiplier and to output said transformation angle θ, whereby said position estimator provides said synchronous reference frame; a DC link voltage sensor for sensing a DC link voltage output of said power converter and providing a DC link voltage feed back signal; a first comparator receiving said DC link voltage feed back signal and a DC link voltage command signal, and producing a DC link voltage error signal; a second PI-regulator regulating said DC link voltage error signal to produce a DC link voltage angle component, wherein a current reference comprises an angle component and an amplitude component and said angle component of said current reference comprises said DC link voltage angle component and whereby said electrical power system controls said DC link voltage output of said power converter; a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; a feedforward function module configured to receive said load current signal and produce a feedforward angle component; a combiner configured to combine said DC link voltage angle component and said feedforward angle component so that said angle component of said current, reference comprises said feedforward angle component whereby a gain sensitivity of said angle component of said current reference is minimized; a non-linear function generator configured to receive said load current signal and produce said amplitude component of said current reference, whereby said controller controls said DC current output of said power converter; a controller configured to provide a voltage command for controlling said power converter, said controller receiving said current feedback signal and said current reference in Park vector format and using said synchronous reference frame, said current feedback signal, and said current reference to produce said voltage command, wherein said controller comprises: a first conversion block for providing said current feedback signal in Park vector format in said synchronous reference frame; a second conversion block for providing said current reference in Park vector, format in said synchronous reference frame; a second comparator using said current feedback signal and said current reference in said synchronous reference frame to provide a command; and a third PI-regulator regulating said command to produce said voltage command; and a space vector modulation module, said space vector modulation module receiving said voltage command and providing control signals to said power converter.

Claim 21

An electrical power system comprising: an electric power source comprising a high reactance permanent magnet generator adapted for providing AC power at varying power factors; a power converter connected to said electric power source; a plurality of current sensors, said plurality of current sensors disposed for sensing an AC current between said electric power source and said power converter, and for providing a current feedback signal; a position estimator receiving said current feedback signal in Park vector format and providing a synchronous reference frame, wherein said position estimator comprises: a multiplier configured to multiply said current feedback signal in Park vector format by a negative estimate of a transformation angle e in Park vector format to provide a synchronous frame signal; a first PI-regulator configured to regulate said synchronous frame signal compared to zero to provide an estimated electrical frequency; and an integrator configured to integrate said estimated electrical frequency so as to provide said negative estimate of said transformation angle θ to said multiplier and to output said transformation angle θ, whereby said position estimator provides said synchronous reference frame; a DC link voltage sensor for sensing a DC link voltage output of said power converter and providing a DC link voltage feed back signal; a first comparator receiving said DC link voltage feed back signal and a DC link voltage command signal, and producing a DC link voltage error signal; a second PI-regulator regulating said DC link voltage error signal to produce a DC link voltage angle component, wherein a current reference comprises an angle component and an amplitude component and said angle component of said current reference comprises said DC link voltage angle component and whereby said electrical power system controls said DC link voltage output of said power converter; a current sensor disposed for sensing a DC current output of said power converter and providing a load current signal; a feedforward function module configured to receive said load current signal and produce a feedforward angle component; a combiner configured to combine said DC link voltage angle component and said feedforward angle component so that said angle component of said current, reference comprises said feedforward angle component whereby a gain sensitivity of said angle component of said current reference is minimized; a non-linear function generator configured to receive said load current signal and produce said amplitude component of said current reference, whereby said controller controls said DC current output of said power converter; a controller configured to provide a voltage command for controlling said power converter, said controller receiving said current feedback signal and said current reference in Park vector format and using said synchronous reference frame, said current feedback signal, and said current reference to produce said voltage command, wherein said controller comprises: a first conversion block for providing said current feedback signal in Park vector format in said synchronous reference frame; a second conversion block for providing said current reference in Park vector, format in said synchronous reference frame; a second comparator using said current feedback signal and said current reference in said synchronous reference frame to provide a command; and a third PI-regulator regulating said command to produce said voltage command; and a space vector modulation module, said space vector modulation module receiving said voltage command and providing control signals to said power converter.

Claim 24

The method of claim 19 wherein said controlling step further comprises: providing said current feedback signal in Park vector format in said synchronous reference frame; providing said current reference in Park vector format in said synchronous reference frame; comparing said current feedback signal and said current reference in said synchronous reference frame to provide a command; and regulating said command using a PI-regulator to produce said voltage command.

Claim 25

The method of claim 19 wherein said current reference comprises an angle component and an amplitude component.

Claim 26

The method of claim 21 , further comprising steps of: sensing a DC link voltage output of said power converter and providing a DC link voltage feed back signal; comparing said DC link voltage feed back signal and a DC link voltage command signal to produce a DC link voltage error signal; and regulating said DC link voltage error signal using a PI-regulator to produce a DC link voltage angle component, wherein said angle component of said current reference comprises said DC link voltage angle component and whereby said DC link voltage output of said power converter is controlled.

Claim 27

The method of claim 22 further comprising steps of: sensing a DC current output of said power converter and providing a load current signal; using said load current signal to produce a feedforward angle component; and combining said DC link voltage angle component and said feedforward angle component so that said angle component of said current reference comprises said feedforward angle component whereby a gain sensitivity of said angle component of said current reference is minimized.

Claim 28

The method of claim 21 , further comprising steps of: sensing a DC current output of said power converter and providing a load current signal; and generating a non-linear function of said load current signal to produce said amplitude component of said current reference, whereby said DC current output of said power converter is controlled.