An Adaptive Reactive Power Voltage Control Method for Photovoltaic Power Stations Considering Reactive Power Sufficiency

Abstract

The patent of the present invention discloses an adaptive reactive power voltage control method for photovoltaic power stations considering reactive power adequacy, including reactive power variable droop control, active power reduction control and active power recovery control, and reactive power variable droop control includes the use of maximum power tracking control According to the reactive power control method of the active power control method and the droop control method, the reactive power droop coefficient is set according to the reactive power capacity of the photovoltaic power station to provide reactive power support; the active power reduction control adopts the active power reduction dynamic sorting method, and priority reduction The active output of the photovoltaic power station with high priority releases more reactive power capacity to realize the reactive power support of the system; the active power restoration control adopts the active power restoration dynamic sorting method, and the active power output of the photovoltaic power station with high priority is restored first , to realize the coordinated distribution of reactive power of each photovoltaic power station, and when the reactive power adequacy is insufficient, the reduction of active power can be minimized while achieving the same voltage regulation effect, and the absorption capacity of photovoltaics can be improved.

Description

[0001] Field of study [0002] The invention relates to the technical field of reactive power and voltage control of photovoltaic power plants, in particular to an adaptive reactive power and voltage control method for photovoltaic power plants that takes into account reactive power abundance. Background technique [0003] The global fossil energy crisis makes the demand for new energy more and more urgent, and photovoltaics are increasingly favored as a clean energy. However, with the rapid development of the photovoltaic industry, the phenomenon of voltage over-limits has become increasingly prominent in grid-connected photovoltaic power generation systems. It is an important factor affecting photovoltaic grid connection. [0004] In order to maintain the stability of the voltage at the grid connection point of large-scale photovoltaic power plants, a large amount of reactive power is required for voltage support. In fact, photovoltaic power plants themselves have a certain ...

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Problems solved by technology

[0005] At present, the existing research on reactive power and voltage control methods for photovoltaic power plants mainly focuses on the coordinated control of external reactive power compensation devices and the reactive power and voltage control of photovoltaic power plants themselves, with little attention paid to the reactive power adequacy of each photovoltaic power plant. In terms of differences, there is no control scheme or utilization method when the reactive power adequacy of the photovoltaic power station is insufficient, so the adaptive reactive power voltage control of the photovoltaic power station has great potential for people to tap and develop

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