电力系统自动化2018，Vol.42Issue(9)：100-107,8.DOI:10.7500/AEPS20171115010
负荷虚拟同步机及其低电压故障穿越控制
Load Virtual Synchronous Machine and Its Low Voltage Ride-through Control
摘要
Abstract
The load virtual synchronous machine (LVSM) is a kind of grid-friendly grid-connected interface for loads. However,it does not have the low voltage ride-through(LVRT)capability.For this reason,this paper proposes a LVRT control method for the LVSM to adapt the symmetrical and unsymmetrical faults in the power grid.Firstly,the unified topology of LVSM and its corresponding control strategy are proposed.The extraction of positive sequence component of grid voltage,the detection of LVRT,the change of power setting values,the suppression of negative sequence current and the limitation of input of current loop during a fault are introduced into the basic LVSM controller.It can achieve a short time of grid-connected operation during power failure,the steady operation of loads and the maximal supply of reactive power.Since the LVSM maintains the inertia power control during the fault,the power oscillation is smooth and has inertia after the fault, which can effectively reduce the transient impact on the power grid.The hardware-in-loop experiments are carried out to verify the effectiveness of the proposed LVRT control method.关键词
负荷虚拟同步机/低电压穿越/无功支撑/惯性支撑Key words
load virtual synchronous machine(LVSM)/low voltage ride-through(LVRT)/reactive power support/inertia support引用本文复制引用
胡文强,吴在军,窦晓波,胡敏强..负荷虚拟同步机及其低电压故障穿越控制[J].电力系统自动化,2018,42(9):100-107,8.基金项目
国家电网公司科技项目(PD71-17-008).This work is supported by State Grid Corporation of China(No.PD71-17-008). （PD71-17-008）
