Method for realizing active power emergency control of photovoltaic power station employing collecting line switches

Abstract

The invention relates to a method for realizing active power emergency control of a photovoltaic power station employing collecting line switches, and belongs to the technical field of active automatic adjustment of the photovoltaic power station. The method comprises the following steps: obtaining an active power emergency instruction of the photovoltaic power station from an automatic gain control (AGC) system of a power grid dispatching terminal; with the instruction as an upper limit Pmax of active power emergency control of the photovoltaic power station, collecting active power of a grid-generation point delivery line of the photovoltaic power station and various collecting lines and the states of various collecting line switches; if the online total active power Pgate is greater than the upper limit Pmax, judging that the total active power exceeds the standard; and after the exceeding time exceeds the emergency control exceeding allowable delay, with the difference value between the Pgate and the Pmax as the regulating variable Pset, carrying out fast removal by selecting the active combination of the collecting lines which are slightly greater than the regulating variable, so that the removed active power is as little as possible on the basis of meeting the dispatching instruction. According to the method, the active power emergency control of the photovoltaic power station is realized by the collecting line switches; the condition that the online total active power of the photovoltaic power station rapidly reaches the dispatching instruction is ensured; and electricity is generated as much as possible.

Description

technical field [0001] The invention belongs to the technical field of active power automatic adjustment of a photovoltaic power station, and in particular relates to a method for realizing emergency control of active power of a photovoltaic power station by using a collection line switch. Background technique [0002] In recent years, many photovoltaic bases across the country have been completed and put into production, which has changed the original power supply structure. The impact of photovoltaic power generation on the power grid has gradually increased, from only the reactive power and voltage of local power grids, to the peak regulation and frequency regulation of large power grids. influences. The national standard GB / T1996-2012 "Technical Regulations for Connecting Photovoltaic Power Stations to Power Systems" states: "Photovoltaic power stations should have the ability to participate in frequency regulation and peak regulation of the power system. Photovoltaic po...

AI Technical Summary

Problems solved by technology

[0010] Constrained by the delay of the communication interface of the photovoltaic array and the limitation of the response speed of the active power adjustment of the photovoltaic array (second level), the AGC of the photovoltaic power station can not meet the requirement of quickly reducing the active power output (milliseconds) by adjusting the active output of each photovoltaic array in an emergency. class)