A power generator comprises a casing (110) that in use is deployed in an environment in which the casing is subjected to an excitation motion such as wave motion. A series of masses (101, 103a-c) is located within the casing, wherein at least a first mass is coupled to the casing by a first spring (102), each of the masses is coupled to at least one adjacent mass by a respective spring, and wherein the casing and the series of masses bring a motion of the power generator into resonance with the excitation motion. A plurality of electric machines each comprising a stator and a field source are each associated with a corresponding mass such that a relative motion of a mass and associated electric machine generates electrical power. A power takeoff circuit receives generated electrical power from the plurality of electric machines and outputs electrical power from the power generator.

Controlling a shaft of a turbine generator, wherein the turbine generator includes a static excitation system and wherein the shaft is being driven in a first rotational direction at a predetermined speed. Controlling the shaft includes detecting a torsional oscillation of the shaft, calculating a control signal based on the torsional oscillation, and using the control signal, controlling an amount of power drawn by the static excitation system from the turbine generator.

A hydro-electric power system includes two containers and a support beam having two ends, each end holding one of the containers. The ends allow the containers to travel along a length of the support beam. The support beam pivots about a pivot point, giving each container a maximum height and a minimum height. Fluid flows into each of the containers when located near their maximum height, the flow of water weighting each container and causing it to descend, each container moving longitudinally outward from the pivot point along the support beam as it descends. A dumping mechanism causes each container to release fluid near its minimum height, each container ascending after releasing water and moving longitudinally inward toward the pivot point along the support beam.

This disclosure describes many innovations including but not limited to systems, methods, and non-transitory computer readable media for controlling an energy generator. A system for controlling an energy generator includes a detector for sensing an indicator of electrical energy generated by the generator; an energy storage component configured, in a first mode of operation, to store energy generated during operation at a sub-threshold level insufficient for real-time supply to an electrical energy sink; an energy converter configured, in a second mode of operation, to provide energy generated during operation above the threshold level for real-time supply of energy to the electrical energy sink; and a controllable switch, electrically associated with the detector, and configured to alternately toggle between the first mode of operation and the second mode of operation based on the indicator to thereby permit energy generated at the sub-threshold level to be collected and intermittently used.

A power generator comprises a casing (110) that in use is deployed in an environment in which the casing is subjected to an excitation motion such as wave motion. A series of masses (101, 103a-c) is located within the casing, wherein at least a first mass is coupled to the casing by a first spring (102), each of the masses is coupled to at least one adjacent mass by a respective spring, and wherein the casing and the series of masses bring a motion of the power generator into resonance with the excitation motion. A plurality of electric machines each comprising a stator and a field source are each associated with a corresponding mass such that a relative motion of a mass and associated electric machine generates electrical power. A power takeoff circuit receives generated electrical power from the plurality of electric machines and outputs electrical power from the power generator.

A wave power generator comprises a buoyant casing (500) intended to float in a body of water. An electric machine (103) located within the casing has an armature and a field source, the electric machine having a fixed part coupled to the casing and a moving part. A counterweight assembly (104) is movable within the casing, comprising the moving part of the electric machine and wherein a relative movement of the counterweight assembly and the fixed part of the electric machine generates electric power. Power storage (400) stores power generated by the electric machine and a control system (200) determines a bi-directional energy flow between the power storage and the armature, wherein energy is returned to the electric machine to drive a motion of the counterweight assembly anti-symmetrically to a motion of the casing.

Disclosed are a method and a system for correlating hydro-turbine governing system control parameters and oscillation characteristics, and the method includes the steps: calculating a eigenvalue, a zero point and a pole of a state matrix in a hydro-turbine governing system state space model, taking a pole which is the closest to the imaginary axis and has no zero point in a preset distance as a dominant eigenvalue; determining an oscillation characteristic region of the hydro-turbine governing system on the complex plane according to the dominant eigenvalue; obtaining a system control parameter stability domain according to a Hurwitz stability criterion; and calculating dominant eigenvalues corresponding to different control parameters, classifying the control parameters according to an oscillation characteristic region of a complex plane where the dominant eigenvalue is located, and dividing the oscillation characteristic region in a system control parameter stability domain.

A hydro-electric power system includes two containers and a support beam having two ends, each end holding one of the containers. The ends allow the containers to travel along a length of the support beam. The support beam pivots about a pivot point, giving each container a maximum height and a minimum height. Fluid flows into each of the containers when located near their maximum height, the flow of water weighting each container and causing it to descend, each container moving longitudinally outward from the pivot point along the support beam as it descends. A dumping mechanism causes each container to release fluid near its minimum height, each container ascending after releasing water and moving longitudinally inward toward the pivot point along the support beam.

A method for early detection and anticipatory control of consumer-end load shedding in a single-phase or polyphase electrical grid supplied with single phase or polyphase by at least one generator driven by at least one rotating machine includes measuring a current and a voltage between the at least one generator and the electrical grid and/or a current and a voltage in the electrical grid, deriving at least one signal from the measured current and voltage and using the at least one derived signal to act on the at least one rotating machine.

Systems, method, and computer readable medium are provided for producing a DC output, comprising: a turbine for generating a variable AC from a variable flow; a rectifier for converting the variable AC to a variable first DC; a first DC-DC associated with a storage component; a second DC-DC associated with an inverter; a dual mode circuit for alternately toggling between the first DC-DC and the second DC-DC; and a controller for: operating the circuit to store the first DC in the storage component when the first DC is below a target level, and release energy at the target level using the first DC-DC when the energy reaches the target level; operating the circuit to convert the variable DC to the target level using the second DC-DC when the variable DC is above the target level; and output a target level DC including the released energy or the second DC.