A control method and system for photovoltaic power station participating in system frequency modulation

Abstract

The invention provides a control method and system for a photovoltaic power station participating in system frequency modulation, wherein the method comprises the following steps: calculating an active power regulation amount of a photovoltaic power station according to grid-connected point frequency and a frequency change rate of a photovoltaic power station; correcting the initial command valueof active power of photovoltaic power station according to the active power regulation quantity of photovoltaic power station to obtain the final reference value of active power of photovoltaic powerstation; and based on the final active power reference value of the photovoltaic power station, controlling the active power of the grid-connected point of the photovoltaic power station. The technical scheme provided by the invention judges the disturbance magnitude of the power network through the frequency change rate, and adopts the emergency control to immediately increase or decrease different fixed active powers to regulate the active powers of the photovoltaic power station, thereby strengthening the support strength of the power network frequency, reducing the frequency fluctuation amplitude of the power network and increasing the stability of the power network.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a control method for photovoltaic power plants participating in system frequency regulation. Background technique [0002] Maintaining the frequency of the power system around the rated value is one of the main goals of the safe and stable operation of the power system. However, with the rapid development of new energy power generation such as photovoltaic power generation and wind power generation, the proportion of new energy power generation in the entire system power supply It is also getting higher and higher, and due to the regional characteristics of the development of new energy power generation, its proportion in some regional power grids is already very high. In order to ensure the consumption of new energy power generation, the output of conventional units has been continuously reduced. The number of start-ups of conventional units has to be reduced, which reduces ...

AI Technical Summary

Problems solved by technology

[0002] Maintaining the frequency of the power system around the rated value is one of the main goals of the safe and stable operation of the power system. However, with the rapid development of new energy power generation such as photovoltaic power generation and wind power generation, the proportion of new energy power generation in the entire system power supply It is also getting higher and higher, and due to the regional characteristics of the development of new energy power generation, its proportion in some regional power grids is already very high. In order to ensure the consumption of new energy power generation, the output of conventional units has been continuously reduced. The number of start-ups of conventional units has to be reduced, which reduces the inertia of the entire system and increases the fluctuation of system frequency

[0003] At present, the photovoltaic power station only considers participating in the frequency regulation of the system according to ordinary droop control, and does not give full play to the large-scale rapid power reduction capability of the photovoltaic power station. , this ability is particularly important

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