Primary frequency modulation control method and system for photovoltaic power station based on multi-master station coordination control

Abstract

The invention discloses a primary frequency modulation control method and system for a photovoltaic power station based on multi-master station coordination control. The method comprises the steps that the active power of the grid-connected point of the photovoltaic power station is collected in real time; since AGC load shedding control reserves power reserve capacity for the photovoltaic power station, the active power of the grid-connected point of the photovoltaic power station is active power Pref when the photovoltaic power station has the load shedding level described in the description; when the grid frequency exceeds the artificial dead zone DB disturbance of primary frequency modulation, a PFC control system calculates the active power variation delta P after frequency fluctuation, and the target value Pset=Pref+ delta P is given to the active power issued to an inverter group; and the active power of the photovoltaic power station is changed to achieve primary frequency modulation. The scheme simply needs to upgrade the algorithm of the control software of a conventional photovoltaic power station inverter, and adds a PFC master station coordination mechanism based on the existing AGC function of the power station, so as to realize multi-master station coordination control of AGC and PFC. Cost can be maximized. The primary frequency modulation function of the photovoltaic power station is used to speed up the frequency recovery of a grid.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power station inverter grid connection, and in particular relates to a primary frequency modulation control method and system of a photovoltaic power station based on multi-master coordinated control. Background technique [0002] Solar energy, as a sustainable new energy source, has attracted more and more attention from all over the world due to its non-pollution and renewability. In recent years, my country's photovoltaic power generation industry has developed rapidly, and the installed capacity of photovoltaic power plants has continued to increase. As more and more large-capacity photovoltaic power plants are directly integrated into the power grid, the interaction between photovoltaic power generation systems and power grids has become more and more complicated. . [0003] In solar power generation technology, the photovoltaic cell power generation system is widely used at present. Th...

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Problems solved by technology

[0005] At present, photovoltaic power plants have not yet participated in the primary frequency regulation of the power grid. Since new energy units do not have the moment of inertia characteristics of conventional units, the moment of inertia and equivalent scale of the power grid have been continuously reduced, and the structural dilemma of power grid frequency control has become increasingly obvious.

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