Device for intermediate storage of electrical power in wind turbine and photovoltaic system to achieve regulated power output to energy distribution network, has pump transmitting thermal energy in pressurized air before or during expansion

摘要

The device has a compressor (7) driven by a high-efficient direct current motor (6) for feeding pressurized air into a compressed air tank (8) during a charging process. A pump (14) transmits heat energy developed during compression in the pressurized air to liquid in a thermal insulated container (5). A multistage gas expansion motor (9) removes the air from the tank and a generator (10) downstream to the expansion motor for creation of electrical power during a discharge process. The pump transmits thermal energy in the pressurized air before or during expansion, stored in the liquid. The thermal insulated container is a warm water container. The generator is a net-coupled synchronous generator. The gas expansion motor is a multistage piston, a circular piston or a sliding-vane motor. An independent claim is also included for a method for charging and discharging of energy storage of electric power in a wind turbine and a photovoltaic system.