电力系统保护与控制2023，Vol.51Issue(23)：59-70,12.DOI:10.19783/j.cnki.pspc.230332
考虑暂态功角稳定和故障限流的并网逆变器下垂暂态控制策略
Droop transient control strategy considering transient power angle stability and fault current limitation of a grid-connected inverter
摘要
Abstract
There are issues of transient power angle instability and fault overcurrent in droop-controlled inverters in fault conditions.Thus a transient control strategy that considers both transient power angle stability and fault current limiting is proposed.First,the mechanism of transient power angle instability in droop-controlled inverters and the transient characteristics of fault currents are analyzed.The impact of the reactive power control loop on transient stability and the relationship among transient power angle,short-circuit current,and inverter output voltage are quantitatively analyzed.Second,to achieve transient power-angle stability and fault current limiting,a comprehensive control approach is proposed,one which introduces a dynamic compensation term for transient power-angle in the active power control loop and adapts the voltage reference command value in the reactive power control loop.Finally,simulation experiments are conducted to validate the proposed control strategy.It not only suppresses the continuous increase of power angle caused by unbalanced power during fault processes and mitigates fault overcurrent but also increases reactive power during fault periods to facilitate fault voltage recovery.Consequently,the proposed strategy enables the safe and stable operation of droop-controlled inverters during grid faults.关键词
下垂控制/暂态功角稳定/故障限流/不平衡功率/电压恢复Key words
droop control/transient power angle stability/fault current limitation/unbalanced power/voltage recovery引用本文复制引用
杨欢红,焦伟,黄文焘,施颖,严灵杰..考虑暂态功角稳定和故障限流的并网逆变器下垂暂态控制策略[J].电力系统保护与控制,2023,51(23):59-70,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.52177100).国家自然科学基金项目资助(52177100) （No.52177100）
电力传输与功率变换控制教育部重点实验室开放课题资助(2022AA05) （2022AA05）
