The present invention discloses an
underwater high-density stable hydraulic
energy storage and release
system and a control method thereof, the
system comprises a
supporting system, a high-pressure
liquid storage tank, a liquid level
monitoring system and a bidirectional load energy conversion
system; the
supporting system is connected to the high-pressure
liquid storage tank, and the liquid level
monitoring system is arranged in the high-pressure
liquid storage tank; the high-pressure
liquid storage tank is connected to an atmospheric balance
pipe and a filling and drainage
pipe, the other end of the atmospheric balance
pipe extends outside the horizontal plane, and the other end of the filling and drainage pipe is arranged below the horizontal plane; the bidirectional load energy conversion system comprises a bidirectional
load generator and a water pump
turbine, and a second electric valve and an anti-wave damping valve are arranged in the filling and drainage pipe; when storing energy, the water pump
turbine discharges the water in the high-pressure
liquid storage tank, and when releasing energy, the water enters the high-pressure
liquid storage tank through the second electric valve and the anti-wave damping valve, pushes the water pump
turbine, and drives the bidirectional
load generator to generate
electricity. The present invention realizes stable and high-energy-density
energy storage and release by controlling the drainage and filling of the high-pressure liquid
storage tank.