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

Abstract

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.

Description

Technical field: [0001] The invention belongs to the field of new energy power generation and electrical technology, and in particular relates to a wind energy and solar energy grid-connected power generation system and a control method thereof. Background technique: [0002] Coal fuel has been used to generate electricity for more than two centuries. In recent years, with increasing concern about environmental issues caused by global warming and carbon emissions, clean and sustainable forms of new energy power supply have emerged, such as wind, ocean, solar, biological and geothermal power generation. Among them, wind power and solar power have developed very rapidly in the past 10 years. Both are non-polluting, abundant energy sources that can be generated close to load centers, eliminating the need for high-voltage transmission lines across rural and urban land surfaces. [0003] According to relevant data, the total annual primary energy consumption in 2009 was 6 billi...

AI Technical Summary

Problems solved by technology

Even though some attempts have been made to construct power generation-inverter-grid-connected systems in recent years, the constructed grid-connected systems have problems such as large output power fluctuations and poor grid-connected power quality.

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