Novel wind and light storage mixed off-grid/grid-connected power generation device

Abstract

The invention belongs to the technical field of wind and light storage power generation and particularly relates to a novel wind and light storage mixed off-grid / grid-connected power generation device. The device comprises one or more wind power generators, one or more solar photovoltaic generator sets and an energy storage system. The wind power generators are connected with a public direct-current bus through an AC / DC rectifying unit, the solar photovoltaic generator sets are connected with the public direct-current bus through a one-way DC / DC chopping unit, the energy storage system is connected with the public direct-current bus, and a two-way DC / DC chopping unit, a two-way DC / AC inverter and an LCL filtering unit are connected between the public direct-current bus and an alternating-current power grid or an alternating-current load successively. By means of the two-way DC / DC chopping unit, the public direct-current bus voltage can be reduced, and by the reasonable arrangement of the two-way DC / AC inverter and the LCL filtering unit, electricity of the power grid can be stored in the energy storage system during the low ebb power consumption of the alternating-current power grid, the function of 'peak clipping and valley filling' is provided, the power utilization rate is improved, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of wind-solar-storage power generation, and in particular relates to a novel wind-solar-storage hybrid off-grid / grid-connected power generation device. Background technique [0002] Both wind power generation and solar power generation have intermittent and random characteristics. It is difficult for independent wind farms and photovoltaic power stations to provide continuous and stable energy output. Therefore, wind power generation systems and photovoltaic power generation systems are difficult to predict, control, and dispatch. It will bring great hidden dangers to the security and stability of the power grid. Wind energy and solar energy resources are naturally complementary in terms of time and location, with sufficient sunlight during the day and sufficient wind energy at night, sufficient sunlight in summer and sufficient wind energy in winter. However, the wind-solar hybrid power generation system c...

AI Technical Summary

Problems solved by technology

Although this patent document discloses the connection of a DC / DC chopper between the battery and the DC load, the DC / DC chopper does not have bidirectional power flow characteristics, and it does not disclose the application of a wind-solar hybrid power generation system based on a dual-input Boost circuit For the DC power grid, the technical solution of storing the electric energy of the DC grid in the battery through the DC / DC chopper, the system uses a dual-input Boost converter, and the non-public DC bus scheme, which greatly limits the application of large-scale wind-solar storage

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