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

Abstract

The embodiment of the present invention discloses a method and device for adjusting a reactive current reference value and an active current reference value, which are used in a photovoltaic grid-connected system. The photovoltaic grid-connected system uses a grid-connected inverter as a grid-connected interface. The adjustment The method includes: collecting the real-time grid voltage of the grid-connected point of the photovoltaic grid-connected system; comparing the real-time grid voltage of the grid-connected point, the rated voltage of the grid, the upper limit and the lower limit of the grid voltage action dead zone, and the size of the upper limit of high voltage ride-through; According to the comparison result, the control mode of the grid-connected inverter is determined; according to the control mode, the reactive current reference value and the active current reference value input to the grid-connected inverter are adjusted. The embodiment of the present invention reduces the complicated calculation process, and is suitable for harsh working conditions where the grid voltage increases significantly. It not only ensures the normal output of active power, but also improves the reference value of reactive current, improves the grid-side voltage, and increases the grid-side current. Stabilize 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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