CONTROL OF SYSTEM WITH GAS BASED CYCLE

摘要

System for carrying out a gas based thermodynamic cycle in which a gas is compressed in at least one compressor in one part of the cycle and is expanded in at least one expander operating simultaneously in an upstream or downstream part of the cycle, wherein the change in absolute internal power with gas mass flow rate differs as between the compressor and the expander and wherein the system comprises a control system configured to make selective adjustments so as individually to control, either directly or indirectly, the respective gas mass flow rates through each of the compressor and expander. The system may be an energy storage system including a pumped heat energy storage system configured to provide independent graduated control of system pressure and output power by selective adjustment of the respective gas mass flow rates through each half-engine.