Distributed photovoltaic grid-connected power generation system

Abstract

The invention discloses a distributed photovoltaic grid-connected power generation system. The system comprises a photovoltaic power generation system which consists of a plurality of photovoltaic power generation subsystems in parallel connection, and a management control system, wherein each photovoltaic power generation subsystem comprises a photovoltaic battery panel array, a combiner box, a grid -connected inverter, an on-load tap changing transformer and a voltage regulator which are successively connected, the combiner box and the management control system are connected with a storage battery through a charging switch, the voltage regulator and the management control system are connected with an alternating-current power grid through a distribution switch, the input terminal of the alternating-current power grid is connected with a load, and the management control system is connected with a human machine interface (HMI). The distributed photovoltaic grid-connected power generation system disclosed by the invention has the advantages that the voltage excursion is controlled within a certain range, and the voltage is regulated, so that the stability of the voltage is guaranteed; besides, the solar energy is converted into the electric energy, so that effective supplement is provided to the regular power grid energy, and the power generation system is clean and energy-saving; the human machine interface is adopted to monitor the system in real time, so that the safety and the operating efficiency of the system are improved.

Description

technical field [0001] The invention relates to a power generation system, in particular to a distributed photovoltaic grid-connected power generation system. Background technique [0002] With the rapid development of human civilization, energy depletion and environmental pollution have become increasingly serious in recent years, and renewable energy has gradually attracted worldwide attention. Solar energy is an inexhaustible source of clean energy, and the photovoltaic power generation industry using solar energy has naturally attracted much attention. The solar photovoltaic power generation industry is one of the fastest growing high-tech industries in the world since the 1980s. Photovoltaic power generation systems are usually divided into two categories: independent photovoltaic power generation systems and photovoltaic grid-connected power generation systems. my country is currently in the initial stage of photovoltaic power generation. Photovoltaic grid-connected po...

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Problems solved by technology

[0003] The existing photovoltaic grid-connected power generation system is mainly composed of solar photovoltaic panels, controllers, inverters and batteries. The main disadvantage of such systems is the complex structure between solar photovoltaic panels and inverters. Therefore, the installation cost is high. Secondly, the performance of the existing inverter is unstable, easy to be damaged, and the service life is not long, which affects the stability and normal operation of the entire power generation system. Furthermore, the voltage through the inverter is directly transmitted to the AC Power grid, resulting in large fluctuations in the voltage range of the grid and instability, so it needs to be improved

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