摘要
随着风电场、光伏站、储能站等新能源机组的装机容量不断增加,静止无功发生器(SVG)除了要对各新能源场站进行无功补偿和电压支撑外,在晶闸管换相失败、电网短路、新能源机组大规模并网等造成的电网电压骤升、骤降等暂态故障时,除了要保证SVG自身可实现高低电压穿越外,还要对电网进行一定的无功支撑。本文分析SVG在电网不同短路比下对电网的影响,提出一种SVG高低穿暂态宽滞环控制策略,避免低短路比电网在故障期间、SVG暂态支撑时反复进出高低穿控制策略而引起的电网振荡。
As the installed capacity of new energy units such as wind stations,photovoltaic stations,and energy storage stations continues to increase,the static reactive power generator(SvG)not only needs to provide reactive power compensation and voltage support for each new energy station,but also needs to ensure that the svG itself can achieve high and low voltage crossing in case of transient faults such as grid voltage surge and drop caused by thyristor commutation failure,grid short circuit,and large-scale grid connection of new energy units,We also need to provide certain reactive power support for the power grid.This article analyzes the impact of SvG on the power grid under different short circuit ratios,and proposes an SvG high and low transient wide hysteresis control strategy to avoid grid oscillations caused by low short circuit ratio power grid repeatedly entering and exiting the high and low transient control strategy during faults and SvG transient support.
作者
田博华
魏洪实
赵波
吕孝国
周晓亮
赵爽
Tian Bohua;Wei Hongshi;Zhao Bo;Lv Xiaoguo;Zhou Xiaoliang;Zhao Shuang
出处
《变频器世界》
2023年第10期88-92,共5页
The World of Inverters
关键词
SVG
高低电压穿越
短路比无功支撑
SVG
High-low voltage ride through
Short-circuit ratio
Reactive support
