Photovoltaic power station integrated automatic system and method of 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 photovoltaic power station electric automation. It relates to a photovoltaic power station comprehensive automation system, which is used for real-time monitoring of the operation of the photovoltaic power station, receiving and dispatching master station active power output adjustment. Background technique [0002] Grid-connected power generation of large-scale ground-mounted photovoltaic power plants is currently the main form of utilization of solar power generation. The megawatt-level photovoltaic grid-connected power generation system mostly adopts block-based power generation and centralized grid-connected schemes. Usually, every 1 megawatt is a photovoltaic sub-array, and a combiner box, inverter, and box-type transformer are configured to complete the DC conversion and initial boost. Multiple photovoltaic sub-arrays are gathered together and sent to the low-voltage busbar, and finally boosted by the main t...

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

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