Centralized photovoltaic power station and control method and system for participating in power grid frequency modulation by employing same

Abstract

The present invention discloses a centralized photovoltaic power station and a control method and system for participating in power grid frequency modulation by employing the same. The method comprises the steps of: (1) detecting grid frequency, determining whether the grid frequency is equal to a rated frequency or not, if yes, finishing the steps, or else, supplying inertia response by a first energy storage system; (2) determining whether the grid frequency exceeds a frequency dead zone of the motion of photovoltaic power generation units or not, if yes, allowing the photovoltaic power generation units to participate in the primary frequency regulation of the power grid one by one according to a frequency change condition, or else, returning the steps; and (3) determining whether the grid frequency exceeds an allowed normal operation change range or not, if yes, outputting active power by a second energy storage system, and providing the emergency control of the frequency, or else,returning the step (1). The centralized photovoltaic power station and the control method and system for participating in power grid frequency modulation by employing the same can coordinate with theactive control of a plurality of photovoltaic power generation units in a photovoltaic power station to allow the centralized photovoltaic power station to participate in the frequency regulation of the electric system so as to facilitate safety and stability of the power grid in a large-scale photovoltaic grid connected condition.

Description

technical field [0001] The invention relates to new energy power generation and power grid control technology, in particular to a centralized photovoltaic power station and its control method and control system for participating in power grid frequency regulation. Background technique [0002] With the rapid development of the photovoltaic industry and the gradual maturity of photovoltaic grid-connected control technology, the construction of centralized grid-connected photovoltaic power plants has become an effective way to efficiently utilize solar energy. Due to the special working environment of photovoltaic power plants and relatively large area, centralized photovoltaic power plants are generally located in relatively remote areas. The load types in remote areas are single and the grid structure is weak. Therefore, when the grid-connected capacity of centralized photovoltaic power plants expands, the randomness and volatility of photovoltaic output power will increase ...

AI Technical Summary

Problems solved by technology

However, in this case, the power that can be dispatched by the photovoltaic power station is affected by the intensity of light, and the capacity is likely to be insufficient.

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