A CAES generator includes a plurality of motors, a plurality of compressors, a pressure accumulator, an expander, a generator, an electric-motor inverter that changes a rotation speed of each of the motors, a feed command receiver that receives input power as a feed command value before feeding the input power, and a controller. The controller includes a compressor number calculation unit that calculates a maximum number of motors that are allowed to be driven at a rating based on the feed command value, and a compressor drive control unit that drives at the rating, the motors, the number of which is the maximum number calculated by the compressor number calculation unit.

A CAES generator includes a plurality of motors, a plurality of compressors, a pressure accumulator, an expander, a generator, an electric-motor inverter that changes a rotation speed of each of the motors, a feed command receiver that receives input power as a feed command value before feeding the input power, and a controller. The controller includes a compressor number calculation unit that calculates a maximum number of motors that are allowed to be driven at a rating based on the feed command value, and a compressor drive control unit that drives at the rating, the motors, the number of which is the maximum number calculated by the compressor number calculation unit.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A method for expanding a gas flow between an inlet for the supply of the gas flow at certain inlet conditions of inlet pressure and inlet temperature and an outlet for the delivery of expanded gas at certain desired outlet conditions of outlet pressure and outlet temperature, whereby this method at least comprises the step of at least partly expanding the gas flow between the inlet and the outlet through a pressure reducing valve and at least partly expanding it through a pressure reducing unit with a rotor driven by the gas for converting the energy contained in the gas into mechanical energy on this shaft.

A method for expanding a gas flow between an inlet for the supply of the gas flow at certain inlet conditions of inlet pressure and inlet temperature and an outlet for the delivery of expanded gas at certain desired outlet conditions of outlet pressure and outlet temperature, whereby this method at least comprises the step of at least partly expanding the gas flow between the inlet and the outlet through a pressure reducing valve and at least partly expanding it through a pressure reducing unit with a rotor driven by the gas for converting the energy contained in the gas into mechanical energy on this shaft.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

An apparatus is disclosed that includes a fluid inlet in fluid communication with a valve assembly, the valve assembly structured to selectively permit the flow of a motive fluid from the fluid inlet to a fluid driven motor, and wherein the valve assembly further includes a first plunger and a second plunger, one of the first plunger and the second plunger including a plurality of axially incorporated fluid channels, wherein the plunger including a plurality of axially incorporated fluid channels is structured to be selectively driven by an actuator such that as the plunger including a plurality of axially incorporated fluid channels is axially displaced away from a first position the number of axially incorporated fluid channels in fluid communication with the fluid inlet and the fluid driven motor increases.

An apparatus is disclosed that includes a fluid inlet in fluid communication with a valve assembly, the valve assembly structured to selectively permit the flow of a motive fluid from the fluid inlet to a fluid driven motor, and wherein the valve assembly further includes a first plunger and a second plunger, one of the first plunger and the second plunger including a plurality of axially incorporated fluid channels, wherein the plunger including a plurality of axially incorporated fluid channels is structured to be selectively driven by an actuator such that as the plunger including a plurality of axially incorporated fluid channels is axially displaced away from a first position the number of axially incorporated fluid channels in fluid communication with the fluid inlet and the fluid driven motor increases.