基于无源性控制的二极管钳位三电平VSC-HVDC

NPC Three-Level VSC-HVDC Based on Passivity Control

电压源换流器型高压直流输电系统(VSC-HVDC)采用多电平换流器结构能够提高系统传输容量并改善电能质量。基于无源性理论,构建无源性控制模型,通过对二极管钳位(NPC)三电平VSC-HVDC系统进行仿真,整流侧换流器采用定直流电压和单位功率因数控制,逆变侧换流器采用直接功率控制,实现三电平换流器的电容电压均衡控制和双侧换流器的独立控制。仿真结果证实了基于无源性控制的三电平VSCHVDC能够稳定地运行,并且具有稳态特性好、响应速度快、算法实现简单和鲁棒性强等优点。

VSC-HVDC could improve the system transmission capacity and the power quality by using multilev- el inverter. In this research, passivity control model was constructed based on the theory of passivity; by sim- ulating the system of the NPC three-level VSC-HVDC, rectifier side converter adopted constant DC voltage control and unit power factor control.; inverter side converter adopted the direct power control, thus achieving the capacitor voltage balance control of three-level inverter and the independent control of two-side inverter. Simulation results confirmed that the NPC three-level VSC-HVDC based on passivity-control operated stably, and it has many advantages, such as good steady-state performance and, high response speed, simple algo- rithm and strong robustness.