摘要
为解决功率接口所引起的稳定性下降问题,提出一种基于阻尼阻抗功率接口算法的多端柔性直流输电系统数字物理混合仿真方法。根据阻尼阻抗法开环传递函数特性,得出阻尼阻抗与物理仿真系统等效阻抗匹配原则。分类讨论并计算不同工况下物理仿真系统的等效阻抗,实现对阻尼阻抗的实时匹配,进而提升数字物理混合仿真系统的稳定性与精确性。提出了一种针对直流电压接口的延时补偿方法,解决功率接口延时补偿问题,降低接口延时带来的仿真误差。搭建了四端柔性直流电网数字物理混合仿真平台验证所提出的接口算法,对混合系统进行不同工况下的仿真试验,结果表明,所提出的数字物理混合仿真方法可以对接口延时进行高效补偿,在传输功率变化、换流站闭锁等情况下可以保证系统稳定运行。
In order to solve the problem of stability degradation caused by power interface,a hybrid digital-physical simulation method for multi-terminal flexible DC transmission system based on damping impedance power interface algorithm is proposed.According to the characteristics of open-loop transfer function of damping impedance method,the equivalent matching principle of damping impedance and physical simulation system impedance is obtained.The equivalent impedances of the physical simulation system under different working conditions are classified and calculated,realizing real-time matching of the damping impedance,and improving stability and accuracy of the power hardware-in-loop simulation system.In this paper,a delay compensation method for DC voltage interface is proposed based on delay compensation of power interface to deal with the delay simulation error.In order to verify the proposed interface algorithm,a four-terminal flexible DC grid power hardware-in-loop simulation platform is proposed. Simulation results show that the proposed power hardware-in-loop simulation method can compensate the interface delay effectively and ensure stable operation of the system when transmission power is changed and converter station is blocked.It has certain feasibility.
作者
辛业春
王威儒
李国庆
王朝斌
江守其
杨洋
XIN Yechun;WANG Weim;LI Guoqing;WANG Chaobin;JIANG Shouqi;YANG Yang(School of Electrical Engineering,Northeast Electric and Power University,Jilin132012,Jilin Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2018年第12期3903-3909,共7页
Power System Technology
基金
国家重点研发计划资助项目(2016YFB0900900)~~
关键词
多端柔性直流输电
数字物理混合仿真
阻尼阻抗法
延时补偿
multi-terminal flexible DC transmission
power hardware-in-loop simulation
damping impedance interface algorithm
delay compensation
