Systems and methods for improving drivetrain efficiency for compressed gas energy storage
First Claim
1. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
- a hydraulic-pneumatic energy storage and recovery system (i) configured to provide a varying pressure profile at least at one outlet thereof, and (ii) comprising a heat transfer subsystem to provide isothermal expansion and compression of gas within the energy storage and recovery system;
a hydraulic motor-pump in fluid communication with the outlet; and
a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution.
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Accused Products
Abstract
In various embodiments, systems for providing a constant electrical output from a compressed gas energy storage and recovery system include a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet, a hydraulic motor-pump in fluid communication with the outlet, and a control system for enabling the constant electrical output by controlling at least one of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, or displacement per revolution.
631 Citations
19 Claims
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1. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system (i) configured to provide a varying pressure profile at least at one outlet thereof, and (ii) comprising a heat transfer subsystem to provide isothermal expansion and compression of gas within the energy storage and recovery system; a hydraulic motor-pump in fluid communication with the outlet; and a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet thereof; a hydraulic motor-pump in fluid communication with the outlet; and a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution, wherein the control system is configured to vary the displacement per revolution of the hydraulic motor-pump in response to the varying pressure profile at the outlet.
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13. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet thereof; a variable displacement hydraulic motor-pump in fluid communication with the outlet; and a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution, wherein the control system varies flow rate inversely with pressure as a function of time.
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14. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system (i) configured to provide a varying pressure profile at least at one outlet thereof, (ii) using staged hydraulic conversion to provide the varying pressure profile, and (iii) comprising; a cylinder assembly including a staged pneumatic side and a hydraulic side, the sides being separated by a movable mechanical boundary mechanism that transfers energy therebetween, and a compressed gas storage system in fluid communication with the cylinder assembly; a hydraulic motor-pump in fluid communication with the outlet; and a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution.
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15. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet thereof; a fixed displacement hydraulic motor-pump in fluid communication with the outlet; an electric motor-generator, for forming the electrical output, mechanically coupled to the fixed displacement hydraulic motor-pump; and a control system (i) for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution, and (ii) comprising a variable frequency drive coupled to the electric motor-generator to control a load on the hydraulic motor-pump.
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16. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet thereof; a fixed displacement hydraulic motor-pump in fluid communication with the outlet; an electric motor-generator, for forming the electrical output, mechanically coupled to the fixed displacement hydraulic motor-pump; and a control system (i) for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution, and (ii) comprising a continuously variable transmission disposed between the hydraulic motor-pump and the electric motor-generator to control a load on the hydraulic motor-pump.
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17. A system (i) for providing an electrical output constant in terms of at least one of frequency, voltage, current, or power from a compressed gas energy storage and recovery system, and (ii) suitable for the efficient use and conservation of energy resources, the system comprising:
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a hydraulic-pneumatic energy storage and recovery system configured to provide a varying pressure profile at least at one outlet thereof; a digital displacement hydraulic motor-pump in fluid communication with the outlet; and a control system for enabling the electrical output by controlling at least one variable selected from the group consisting of pressure, piston position, power, flow rate, torque, RPM, current, voltage, frequency, and displacement per revolution, wherein the digital displacement hydraulic motor-pump comprises; a high pressure input-output; a low pressure input-output; an off-center rotating cam; a plurality of radial piston assemblies coupled to the off-center rotating cam; and a control valve arrangement responsive to the control system for operating the hydraulic motor-pump at, at least one of a substantially constant pressure, power output, flow rate, torque, RPM, or displacement per revolution. - View Dependent Claims (18, 19)
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Specification