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741 results about "System change" patented technology

Systems change is about addressing the root causes of social problems, which are often intractable and embedded in networks of cause and effect. It is an intentional process designed to fundamentally alter the components and structures that cause the system to behave in a certain way.

Wind energy and solar energy grid-connected generation system and control method thereof

The invention provides a wind energy and solar energy grid-connected generation system and a control method thereof. The wind energy and solar energy grid-connected generation system comprises a generation unit, an inversion unit, a grid-connecting unit, a main control unit and a detection unit. Each unit is effectively controlled by an integrated control unit which is formed by a digital signal processor (DSP), and operating state parameters of the system are predicted by a neural network, so the defect that the grid-connected system changes due to execution delaying of a control instructionis overcome, and the operating stability of the system is improved. Island detection adopts an active and passive detection mode, so the capacity for anti-island operation of the system is improved. The invention has the advantages that: inverted electric energy is supplied to an electricity grid and can be locally supplied to local alternating current and direct current loads, so the load pressure of the electricity grid is reduced, and the capacity for stable operation of the electricity grid can be improved; and when the output electric energy of the system is smaller than a local load, the electricity grid can supply power to the local load of the system, so the local load is supplied with power doubly by power supplies of the system and the electricity grid, and the time for uninterrupted power supply of the power supplies is prolonged.
Owner:NORTHEASTERN UNIV

Automatic carrier-landing guiding method of carrier-borne unmanned aircraft

The invention discloses an automatic carrier-landing guiding method of a carrier-borne unmanned aircraft and belongs to the technical field of automatic carrier-landing guiding for carrier-borne aircrafts. The method comprises the following steps of determining a reference flight path at a capturing phase according to the initial course information and the positional information of the unmanned aircraft, determining a reference flight path at a tracking phase by considering the influence of deck movement, acquiring a flight-path error at the capturing phase by adopting a direct sightline method, and obtaining a flight-path error at the tracking phase by adopting a dynamic coordinate-system changing method; calculating longitudinal and transverse control-signal instruction values according to the flight-path errors, and guiding the carrier-borne unmanned aircraft to fly along the reference flight paths. The automatic carrier-landing guiding method of the carrier-borne unmanned aircraft provided by the invention has high realizability and operability, so that the carrier-landing performance of the unmanned aircraft under a specific carrier-landing environment is improved; the deck movement is directly led into a carrier-landing tracking-phase guiding algorithm, so that the addition of a deck-movement compensator to a controller is avoided, the complexity of a flight control system is lowered, and the reliability of a carrier-landing system is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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