Control method for distributed photovoltaic energy storage microgrid

Abstract

The invention belongs to the technical field of photovoltaic energy storage micro-grids and belongs to a control method for a distributed photovoltaic energy storage micro-grid. The micro-grid comprises a distributed photovoltaic array, a DC / DC switching system, an inverter control system, an energy storage system, a load and a power distribution network; the microgrid works in three modes, namelya grid-connected operation mode, an off-grid operation mode and a system grid-connected operation recovery mode. According to the method of the invention, the front surface of a photovoltaic panel isalways perpendicular to sunlight, so that the photoelectric conversion efficiency of the photovoltaic panel is effectively improved; a wind power monitoring circuit is installed in an automatic sunlight tracking system, so that the photovoltaic panel is unlikely to fall off or be damage by strong wind, and the service life of the photovoltaic panel is prolonged.

Description

technical field [0001] The invention relates to the technical field of photovoltaic energy storage microgrids, in particular to a control method for distributed photovoltaic energy storage microgrids. Background technique [0002] The world's industry and economy have developed rapidly in recent years, and at the same time, it has brought about global energy shortage. At the same time, there are more and more problems exposed in the operation of large-scale power systems. It is in this situation that new energy distributed power generation technology develops rapidly. At present, the Chinese government is actively promoting solar photovoltaic power generation, and the photovoltaic power generation market has also obtained unprecedented opportunities and development. However, the current generated by photovoltaic power generation is direct current and cannot be directly used by the grid. It needs to be converted by an inverter before it can be connected to the grid. In orde...

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Problems solved by technology

[0004] However, there are still some problems in the use of the existing distributed photovoltaic energy storage microgrid. For example, the distributed photovoltaic array is fixed at an angle, which cannot ensure the vertical irradiation of sunlight in real time, so it cannot collect sufficient sunlight. energy, resulting in low power generation efficiency; distributed photovoltaic arrays are easily destroyed by strong winds after being fixed, and are restricted by weather conditions; the practical status of energy storage batteries cannot be detected in real time, and the failure rate is high

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