A method for operating a system for airborne wind energy production having a ground station, a glider with an airfoil, and a tether for connecting the glider with the ground station, which has an electrical rotary machine connected to a reel for storing excess length of tether. The method includes operating the system in a regular operating mode with repeated operation cycles. Each cycle includes a production phase with increasing free length of the tether and a reel-in phase with decreasing free length of the tether. The method further includes monitoring wind conditions and changing the operation of the system to a low wind operation mode when the monitored wind conditions drop below a predetermined lower wind condition threshold or to a high wind operation mode when the monitored wind conditions raise above a predetermined upper wind condition threshold. And, a system configured to operate in accordance with the method.

[Problem] To achieve a sail movement comprising rotation while revolving, using a relatively simple structure that does not easily break. [Solution] A sail device 1 includes a supporting body 2, a sail body 4, a guide track comprising recessed portions 5a, 5b, and engaging portions 8a, 8b. Rotational energy is output from or input to a rotating body 2c forming part of the supporting body 2. The sail body 4 is attached to the supporting body 2 with freedom to rotate, and revolves around an axis of the supporting body 2. The sail body 4 converts fluid energy into rotational energy or converts rotational energy into fluid energy on the basis of the motion of the sail body 4 which is in contact with a fluid. In the guide track, the two recessed portions 5a, 5b are continuous with one another, forming an endless track which defines an angle of rotation of the sail body 4 during the process of revolving. The engaging portions 8a, 8b engage the sail body 4 with the guide track, and cause the sail body 4 to be displaced along the guide track.

A reciprocal motion wind energy harvesting device has a first vane carrier assembly and a second vane carrier assembly, which are supported by and rotate about a central shaft. The vane carrier assemblies support pluralities of vanes to receive wind force. The vanes are configured to be rotatable in order to produce opposing and reciprocating motion of the lever arm assemblies. The lever arm assemblies are operatively connected to a generator in order to convert the wind force received by the vanes into energy.

Dynamic allocation of power modules for charging electric vehicles is described herein. The charging system includes multiple dispensers that each include one or more power modules that can supply power to any one of the dispensers at a time. A dispenser includes a first power bus that is switchably connected to one or more local power modules and switchably connected to one or more power modules located remotely in another dispenser. The one or more local power modules are switchably connected to a second power bus in the other dispenser. The dispenser includes a control unit that is to cause the local power modules and the remote power modules to switchably connect and disconnect from the first power bus to dynamically allocate the power modules between the dispenser and the other dispenser.

It is about an omnidirectional generator apparatus, capable of translating the push of a fluid from any direction in the vertical, horizontal or diagonal plains to rotational movement on a unique axis. This rotational movement can be translated to electric energy by known means.

A method of using a bagged power generation system comprising windbags and waterbags integrated with drones and adapting drone technologies for harnessing wind and water power to produce electricity. An extremely scalable and environmentally friendly method, system, apparatus, equipment, techniques and ecosystem configured to produce renewable green energy with high productivity and efficiency.

An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

Dynamic allocation of power modules for charging electric vehicles is described herein. The charging system includes multiple dispensers that each include one or more power modules that can supply power to any one of the dispensers at a time. A dispenser includes a first power bus that is switchably connected to one or more local power modules and switchably connected to one or more power modules located remotely in another dispenser. The one or more local power modules are switchably connected to a second power bus in the other dispenser. The dispenser includes a control unit that is to cause the local power modules and the remote power modules to switchably connect and disconnect from the first power bus to dynamically allocate the power modules between the dispenser and the other dispenser.

Methods, systems, and techniques for harnessing wind energy use a tethered airfoil and a digital hydraulic pump and motor, which may optionally be a combined pump/motor. During a traction phase, a wind powered airfoil is allowed to extend a tether and a portion of the wind energy harnessed through extension of the tether is stored prior to distributing the wind energy to an electrical service. During a retraction phase, the wind energy that is stored during the traction phase is used to retract the tether. The digital hydraulic pump and motor are mechanically coupled to the tether.

Sail movement is achieved having rotation while revolving, using a simple structure that does not easily break. A sail device includes a supporting body, a sail body, a guide track comprising recessed portions, and engaging portions. Rotational energy is output from or input to a rotating body forming part of the supporting body. The sail body is attached to the supporting body which freely rotates, and revolves around an axis of the supporting body. The sail body converts fluid energy into rotational energy or converts rotational energy into fluid energy on the basis of the motion of the sail body which contacts a fluid. In the guide track, two recessed portions are continuous with one another, and form an endless track which defines an angle of rotation of the sail body during the process of revolving. The engaging portions engage the sail body with the guide track, and displace the sail body along the guide track.