Method and device for adjusting reactive current reference value and active current reference value

Abstract

An embodiment of the invention discloses a method and device for adjusting a reactive current reference value and an active current reference value for a photovoltaic grid-connected system that uses agrid-connected inverter as a grid-connected interface. The adjustment method comprises the following steps of collecting a real-time grid voltage of a grid-connected point of the photovoltaic grid-connected system; comparing a real-time grid voltage, a grid rated voltage, an upper limit and a lower limit of a grid voltage action dead zone, and the value of a high voltage crossing upper limit of the grid-connected point; determining, according to the result of the comparison, a control mode of the grid-connected inverter; and adjusting a reactive current reference value and an active current reference value input to the grid-connected inverter according to the control mode. The embodiment of the invention reduces the complicated calculation process and is suitable for the severe working condition in which the grid voltage is greatly increased, which not only ensures the normal output of the active power, but also improves the reference value of the reactive current, improves the voltage on the grid side, improves the current on the grid side and stabilizes the DC bus voltage.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a method and device for adjusting a reactive current reference value and an active current reference value. Background technique [0002] New energy power generation technologies represented by wind power and photovoltaic power generation all use grid-connected inverters (GCI) as the grid-connected interface, and the application of a large number of power electronic equipment in new energy power generation has greatly contributed to the safety of the power system. Stable operation brings new developments and challenges. New energy power generation has poor immunity to disturbance and weak supporting capacity. With the increase of new energy grid-connected installed capacity, it is not uncommon for grid voltage surges to cause large-scale new energy off-grid accidents. In the prior art, the adjustment strategies for reactive current reference value and active ...

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