摘要
风电场站配置一定容量的无功补偿装置(如静止无功发生器(static var generator,SVG))可以提高风电外送能力。同时为了满足风电场站对于惯量和电压支撑的要求,SVG可以在直流侧集成功率型储能元件同时采用构网型控制。然而由于风电场出力的影响,构网型SVG存在着暂态同步失稳的风险。针对此问题,首先通过对构网型SVG接入风电场站的并网系统进行化简等效,得到构网型SVG的功角曲线。然后,利用等面积法则揭示风电场站中构网型SVG的失稳机理,并给出相应的稳定判据。进一步,提出一种基于惯量和阻尼系数协调自适应的暂态同步稳定性提升方法。在判断SVG发生暂态同步失稳时自适应改变惯量和阻尼系数,强迫SVG回到稳定平衡点。该方法可以提高构网型SVG的暂态同步稳定性,有利于风电外送能力的提升。最后在PSCAD/EMTDC中建立电磁暂态仿真模型,验证了构网型SVG失稳机理的正确性以及暂态同步稳定性提升方法的有效性。
The wind farm station is equipped with a certain capacity of static var generators,which can improve the wind power transmission capacity.At the same time,in order to meet the requirements of wind farm stations for inertia and voltage support,SVG can access power-type energy storage components on the DC side and adopt grid-forming control.However,due to the impact of wind farm output,there is a risk of synchronization instability in grid-forming SVG.In response to this issue,first simplifies and equivalently connects the grid-forming SVG to the wind farm station’s system,and obtains the power angle curve of the grid-forming SVG.Then,using the equal area rule,the instability mechanism of the grid-forming SVG in wind farm stations is revealed,and corresponding stability criteria are provided.Furthermore,a synchronous stability improvement method based on coordinated and adaptive inertia and damping coefficients is proposed.Adaptively change the inertia and damping coefficient to force the SVG to return to a stable equilibrium point when judging the occurrence of synchronization instability in the SVG.This method can improve the synchronization stability of grid-forming SVG,which is beneficial for enhancing the wind power transmission capacity.Finally,an electromagnetic transient simulation model was established in PSCAD/EMTDC to verify the correctness of the instability mechanism of the grid-forming SVG and the effectiveness of the synchronization stability improvement method.
作者
刘辉
张少聪
刘京波
李琰
熊小玲
赵成勇
LIU Hui;ZHANG Shaocong;LIU Jingbo;LI Yan;XIONG Xiaoling;ZHAO Chengyong(State Grid Jibei Electric Power Co.,Ltd.Research Institute,Beijing 100045,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《华北电力大学学报(自然科学版)》
北大核心
2025年第5期30-42,共13页
Journal of North China Electric Power University(Natural Science Edition)
基金
国网冀北电力有限公司科技项目(B3018K24006A)。
