摘要
直流配电网是未来城市配电网建设的趋势之一,其中两端供电直流配电网具有较高供电可靠性。该文提出一种背靠背低压直流配电装备的方案,该装备集成两变换器,具有较高功率密度。针对该装备控制的核心问题--直流电压稳定,从直流母线功率和能量平衡角度出发,利用小信号建模分析其直流电压不稳定机理,即直流电压波动由两变换器网侧电压、电流和直流负荷电流扰动引起;提出一种电流环引入多扰动量的直流电压稳定控制策略,实现低压直流配电装备在功率变化、电网电压及负荷扰动下的直流电压稳定控制。通过Matlab/Simulink仿真及样机实验验证所提直流电压稳定控制策略的有效性,将为低压直流用电设备提供稳定可靠的供电电压。
DC distribution grid is one of the trends in the construction of the future urban distribution grid,and the two-terminal DC grid has higher reliability.This paper proposed the back to back LVDC distribution equipment, which integrates two converters,as well as has high power density.Aiming at the core problem of DC voltage stability,the instability mechanism of DC voltage was analyzed by small signal modeling from the aspects of power and energy balance. It is revealed that the DC voltage fluctuation is caused by the disturbance of grid voltage,current and DC loads.Then,the DC voltage control strategy with multiple disturbances introducing to the current loop was proposed to realize the DC voltage stability of the LVDC distribution equipment under different conditions,such as power change,the grid voltage and the load disturbance.Finally,the effectiveness of the proposed DC voltage control strategy was verified by simulation and experiment.It will provide stable and reliable power supply for LVDC power consumption equipment.
作者
李振
盛万兴
段青
李鹏华
杜松怀
王建华
LI Zhen;SHENG Wanxing;DUAN Qing;LI Penghua;DU Songhuai;WANG Jianhua(China Agricultural University,Haidian District,Beijing 100083,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;Southeast University,Nanjing 210018,Jiangsu Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第23期6873-6881,共9页
Proceedings of the CSEE
基金
国家电网公司科技项目(5442PD170002)~~
关键词
低压直流配电
直流电压
不稳定机理
稳定控制
LVDC distribution
DC voltage
instability mechanism
stability control
