A method and system for frequency regulation of a photovoltaic power station

Abstract

The present invention provides a photovoltaic power station frequency regulation method and system. The method comprises the steps of calculating the active output regulation amount of a photovoltaic power station according to the grid-connected point frequency of the photovoltaic power station, and correcting an active power reference value of the photovoltaic power station according to the active output regulation amount; regulating the active power of the photovoltaic power station; real-timely acquiring the grid-connected point frequency of the photovoltaic power station, regulating the active power reference value of the photovoltaic power station according to the grid-connected point frequency, and carrying out the frequency hysteresis regulation on a power grid. The system comprises an active power regulation module and a frequency hysteresis regulation module. Compared with the prior art, the photovoltaic power station frequency regulation method and the photovoltaic power station frequency regulation system provided by the present invention have larger active power-frequency support strength to the power grid than a conventional frequency droop control method, and are suitable for the power grid having higher photovoltaic power generation permeability by arranging a hysteresis point on the basis of an original single threshold and always keeping the active power largest strength support before the power grid frequency returns to the hysteresis point.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to a method and system for adjusting the frequency of a photovoltaic power station. Background technique [0002] Photovoltaic power generation is a new energy generation technology that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electrical energy. The solar cells are packaged and protected after being connected in series to form a large-area solar cell module, and then cooperate with power controllers and other components to form a photovoltaic power generation device. The photovoltaic power generation device transmits electric energy to the grid through an inverter, forming a grid-connected photovoltaic power generation system. With the increasing scale of photovoltaic grid-connected power generation systems connected to the power grid, it has brought power system power flow, stability, peak regulation, and coordin...

AI Technical Summary

Problems solved by technology

With the continuous increase of the scale of photovoltaic grid-connected power generation systems connected to the power grid, it has brought power system power flow, stability, peak regulation, and coordination problems among multiple photovoltaic power plants to grid dispatching, which has affected the ability of the grid to accept photovoltaic power generation.

[0003] At present, the droop control method is generally used to adjust the active power output and grid frequency of the photovoltaic grid-connected power generation system, but the traditional droop control method has little support for the active power-frequency of the grid, and cannot meet the grid frequency stability requirements of large-scale photovoltaic grid-connected , and it is also not conducive to the consumption of photovoltaic power generation by the grid

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