A reactive power control method and system for a photovoltaic power generation system

Abstract

The invention relates to a reactive power control method and system for a photovoltaic power generation system, comprising the steps of obtaining a reference value signal of the photovoltaic power generation system in the reactive power control mode based on a set reactive power control mode of a photovoltaic power generation system model; controlling the output of the converter according to a reference value signal; The reactive power control mode comprises a voltage control mode, a reactive power control mode and a reactive power-voltage coordination control mode. Through the scheme, the photovoltaic power generation system can adapt to different reactive power regulation requirements of the power grid.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a reactive power control method and system for a photovoltaic power generation system. Background technique [0002] With the emergence of problems such as environmental pollution, petrochemical energy depletion and energy supply security, the development and utilization of renewable energy has attracted more and more attention from the international community. Solar energy is a renewable and clean energy, and photovoltaic power generation is its main form of utilization. Compared with traditional power generation technologies, photovoltaic power generation has the advantages of sustainable energy, safety and environmental protection, and has developed rapidly in recent years. [0003] When the photovoltaic system is integrated into the grid, when its own capacity is relatively small relative to the grid, the impact of its power disturbance on the security an...

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Problems solved by technology

(5) Low-frequency oscillation suppression of the power grid. The low-frequency oscillation frequency of the power grid is low, the cycle is long, and it affects a wide range, which brings great harm to the power system. Oscillation can even lead to the collapse of the entire system. With the centralized grid-connected operation of large-scale photovoltaic power plants, the grid-connected photovoltaic system should have the function of participating in the suppression of low-frequency oscillation of the power grid

(6) The photovoltaic power station is adjusted as a whole. The inverters of large-scale photovoltaic power stations operate in parallel, and the inverters affect each other. It is easy to affect the stable operation of other inverters

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