Abstract: A method for impedance measurement using chirp signal injection is provided. The method includes injecting at least one chirp signal into the three-phase AC system, and collecting at least one response to the at least one chirp signal. The method further includes transferring the at least one response from abc coordinates to dq coordinates. At least one impedance is calculated based on the at least one response to the at least one chirp signal.

Abstract: A method for impedance measurement in a three-phase AC system is provided. The method includes injecting a shunt perturbation signal into the three-phase AC system and collecting a response to the shunt perturbation signal, and injecting a series perturbation signal into the three-phase AC system and collecting a response to the series perturbation signal. The response to the shunt perturbation signal and the response to the series perturbation signal are then transferred from abc coordinate to dq coordinates. At least one impedance of the three-phase AC system is calculated based on the response to the shunt perturbation signal and the response to the series perturbation signal.

Abstract: This invention relates to the field of very high current integrated power systems and defines a system where an alternating current inductive generator (13), controlled by a generator voltage regulator (14), is coupled to alternating current inductive load (11), controlled by an alternating current inductive load controller (12), all controlled by a supervisory control and data acquisition system (17) with externally adjustable power rate constraints (21) that define a new anticipatory mode integrated power system (10).

Abstract: A method for impedance measurement in a three-phase AC system is provided. The method includes injecting a shunt perturbation signal into the three-phase AC system and collecting a response to the shunt perturbation signal, and injecting a series perturbation signal into the three-phase AC system and collecting a response to the series perturbation signal. The response to the shunt perturbation signal and the response to the series perturbation signal are then transferred from abc coordinate to dq coordinates. At least one impedance of the three-phase AC system is calculated based on the response to the shunt perturbation signal and the response to the series perturbation signal.

Abstract: A method for impedance measurement using chirp signal injection is provided. The method includes injecting at least one chirp signal into the three-phase AC system, and collecting at least one response to the at least one chirp signal. The method further includes transferring the at least one response from abc coordinates to dq coordinates. At least one impedance is calculated based on the at least one response to the at least one chirp signal.

Abstract: An apparatus for extracting wave energy may include a watercraft, a pendulum and an energy converter. The watercraft may be configured to roll in response to wave action and may have roll characteristics that are tunable to characteristics of the wave action. The pendulum may be supported by the watercraft to enable the pendulum to swing in response to the wave action. An energy converter may be configured to convert the relative movement of the pendulum and watercraft into electrical energy. The pendulum may also be tunable to characteristics of the wave action.

Abstract: An apparatus for extracting wave energy may include a watercraft, a pendulum and an energy converter. The watercraft may be configured to roll in response to wave action and may have roll characteristics that are tunable to characteristics of the wave action. The pendulum may be supported by the watercraft to enable the pendulum to swing in response to the wave action. An energy converter may be configured to convert the relative movement of the pendulum and watercraft into electrical energy. The pendulum may also be tunable to characteristics of the wave action.

Abstract: An apparatus for extracting wave energy may include a watercraft, a pendulum and an energy converter. The watercraft may be configured to roll in response to wave action and may have roll characteristics that are tunable to characteristics of the wave action. The pendulum may be supported by the watercraft to enable the pendulum to swing in response to the wave action. An energy converter may be configured to convert the relative movement of the pendulum and watercraft into electrical energy. The pendulum may also be tunable to characteristics of the wave action.

Abstract: An unbalanced line-to-line current is injected at an injected frequency in a three-phase ac circuit. A first set of voltages and currents are obtained. A first set of transformed voltages and transformed currents are produced. The circuit is injected with a second unbalanced line-to-line current at a frequency linearly independent of the injected frequency. A second set of voltages and current are obtained. A second set of transformed voltages and transformed currents are produced The impedance of a source portion and a load portion of the circuit are calculated using the first and second set of transformed voltages, and the first and second set of transformed currents.

Abstract: An unbalanced line-to-line current is injected at an injected frequency in a three-phase ac circuit. A first set of voltages and currents are obtained. A first set of transformed voltages and transformed currents are produced. The circuit is injected with a second unbalanced line-to-line current at a frequency linearly independent of the injected frequency. A second set of voltages and current are obtained. A second set of transformed voltages and transformed currents are produced The impedance of a source portion and a load portion of the circuit are calculated using the first and second set of transformed voltages, and the first and second set of transformed currents.