A photovoltaic power station integrated automation system and method for adjusting active power output

Abstract

The present invention relates to a photovoltaic power station integrated automatic system. The photovoltaic power station integrated automatic system comprises, from bottom to top, a subarray layer, a subarray looped network layer, a spacing layer, a network layer and a station control layer. Each photovoltaic subarray in the subarray layer is equipped with a photovoltaic subarray integrated device, and in the subarray looped network layer, the power generation partitions are divided according to the actual engineerings, and the integrated devices in the power generation partitions form the subarray looped networks which are isolated with each other; in the spacing layer, the partition monitoring is carried out by taking the power generation partitions as the units, in the network layer, a plurality of data networks are divided according to different applications, and the data networks are isolated with each other, and in the station control layer, the equipment of the station control layer interact data with the equipment of the spacing layer via the network layer. According to the present invention, the partition monitoring is adopted, the monitoring content is clear, and the operation and maintenance personnel are convenient to check. An AGC / AVC substation is adopted and is in distributed adjustment, thereby improving the adjustment speed. The data networks are isolated with each other, thereby reducing the network fault risks, and facilitating checking the faults rapidly; the whole system is clear in network structure, the later extension is facilitated, and the access difficulty is reduced.

Description

Technical field [0001] The invention belongs to the field of power automation of photovoltaic power stations. It relates to a comprehensive automation system for photovoltaic power stations, which is used for real-time monitoring of the operation of photovoltaic power stations, and receives active power output adjustments of the dispatch master station. Background technique [0002] Grid-connected power generation of large-scale ground photovoltaic power plants is currently the main form of utilization of solar power. MW-level photovoltaic grid-connected power generation systems mostly use block power generation and centralized grid-connected solutions. Usually every 1 MW is a photovoltaic sub-array, equipped with combiner boxes, inverters and box transformers to complete direct-to-AC conversion and preliminary boost. Multiple photovoltaic sub-arrays are concentrated all the way to the low-voltage bus, and finally boosted by the main transformer and integrated into the grid syst...

AI Technical Summary

Problems solved by technology

[0003] Photovoltaic power generation is greatly affected by the weather, and has the characteristics of power instability, output period, and power fluctuation, which brings a series of problems to the safe operation of the power grid. The traditional method of the power grid dispatching department can only adopt power cuts Such a helpless move, the photovoltaic power station failed to exert its maximum capacity

Even if some power stations are equipped with AGC / AVC servers, the power grid regulates the output of photovoltaic power plants in real time, but the adjustment method is mostly AGC / AVC servers directly send commands to inverters through the data network. When the regulations of photovoltaic power plants continue to expand, the inverters involved in regulation The number of transformers has increased sharply, the algorithm of AGC / AVC server is becoming more and more complex, and the mediation effect is getting worse

Images