Reactive power output method, device and system for photovoltaic power station

Abstract

The invention discloses a reactive power output method, device and system for a photovoltaic power station. The method comprises the following steps: acquiring electric signal data of a grid-connected point of the photovoltaic power station; determining power information of the whole station according to the electric signal data; receiving a reactive power control instruction; determining a photovoltaic inverter reactive action instruction according to the reactive control instruction and the total station power information; and the photovoltaic inverter reactive action instruction is sent to a photovoltaic inverter through a GOOSE protocol, so that the photovoltaic inverter outputs first reactive power. Millisecond-level communication delay and packet loss-free communication between the power control terminal and the photovoltaic inverter are realized by using a high-speed and low-delay GOOSE protocol, and the photovoltaic inverter is used for replacing traditional reactive power compensation equipment to output reactive power, so that the dependence on the reactive power compensation equipment is avoided; therefore, the construction and operation cost of the power grid after the grid connection of the photovoltaic power station is greatly reduced.

Description

Technical field [0001] The present invention relates to the field of photovoltaic grid connection, in particular to a photovoltaic power station reactive output method, apparatus and system. Background [0002] After the large-scale photovoltaic power station is integrated into the power grid, the proportion of power electronics in the power grid rises, the equivalent inertia of the power grid is reduced, and when the power grid sends faults, it mainly relies on the active and reactive support of the traditional unit, and the new energy field station with slow (minute-level) power control does not have the ability to regulate the voltage at one time, which brings a series of difficulties and new challenges to the safe and stable operation of the power grid. [0003] Since the renewable energy generator set based on the power electronic inverter grid does not have the ability to improve the inertia and damping system power oscillation, therefore, the photovoltaic power station us...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a photovoltaic power plant reactive power output method, device and system to solve the problem that in the prior art, in the environment where photovoltaic power generation is integrated into the grid on a large scale, the reactive power output of the grid cannot be guaranteed at the same time, and the connection with the grid The problem with low operating overhead

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