Photovoltaic power generation system and photovoltaic power transmission method

Abstract

The invention provides a photovoltaic power generation system. The photovoltaic power generation system comprises at least one first photovoltaic module, a photovoltaic inverter, a first bidirectionalDC-DC (direct-current-direct current) converter and at least one first energy storage unit and also comprises at least one second photovoltaic module or at least one energy storage unit; the photovoltaic inverter comprises a DC-DC converter and a DC-AC (alternating current) inverter, the DC-DC converter is electrically connected with the at least one first photovoltaic module, and the DC-DC converter and the DC-AC inverter are connected through a DC bus; the first bidirectional DC-DC converter comprises at least three ports, the first port is electrically connected with the DC bus, the secondport is electrically connected with a port of the at least one first energy storage unit, and the third port is electrically connected with an output port of the at least one second photovoltaic module or a port of the at least one energy storage unit. The photovoltaic power generation system can be configured with photovoltaic arrays and an energy storage device flexibly to cope with power utilization peaks and valleys.

Description

technical field [0001] The present application relates to the field of circuits, in particular to a photovoltaic power generation system and a photovoltaic power transmission method. Background technique [0002] Photovoltaic power generation is a clean technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. It is clean, sustainable and safe. The disadvantage of photovoltaic power generation is that the output power is unpredictable and the output power fluctuates greatly, which brings a series of problems to the stability of the power grid. [0003] One way to solve the above problems is to add an energy storage device to the photovoltaic power generation system. When the output power of the photovoltaic array is large and the power consumption demand of the grid is small, the excess electric energy can be stored in the energy storage device; when the photovoltaic array When the output power of ...

AI Technical Summary

Problems solved by technology

[0005] Since the power of the photovoltaic inverter and the DC-DC converter have a maximum power limit, when it is necessary to increase the output power of the photovoltaic array, it is necessary to replace a high-power photovoltaic inverter. When the power demand of the grid decreases , a larger-capacity energy storage device is required to store electrical energy, and accordingly, a high-power DC-DC converter needs to be replaced, resulting in the inability of the photovoltaic power generation system to flexibly configure photovoltaic arrays and energy storage devices

Images