摘要
文章阐述了基于电压源换流器(VSC)和脉冲宽度调制(PWM)技术的直流输电与传统的直流输电相比具有的诸多优点。在建立交/直流(AC/DC)并联输电系统模型基础上,提出一种优化控制策略,该控制策略将直流输电本身的控制与发电机励磁控制相综合,在系统发生故障时能同时稳定发电机和直流输电系统。还在相同的条件下对基于VSC的HVDC和传统的HVDC进行了仿真比较,仿真结果表明,在该优化控制策略指导下,前者在系统发生故障时体现了较好的阻尼特性,且该HVDC系统本身在该控制策略下也有较高的稳定性。
Comparing with traditional HVDC system the merits of a new type of HVDC system based on voltage source converters (VSC) and pulse width modulation (PWM) technologies is expounded. On the basis of establishing the model of parallel AC/DC transmission system an optimal control strategy is proposed in which the control of HVDC system itself is integrated with the control of generator excitation, when fault occurs in the system the generators and the HVDC transmission can be stabilized at the same time. The new type of HVDC system based on VSC and the traditional HVDC system are simulated under the same conditions, the simulation results show that by use of the proposed optimal control strategy the former possesses a better damping characteristic under the fault, and the former itself also possesses better stability with this control strategy being used.
出处
《电网技术》
EI
CSCD
北大核心
2004年第10期38-41,共4页
Power System Technology
关键词
HVDC系统
优化控制策略
电压源换流器
直流输电系统
Computer simulation
Damping
Electric converters
Electric generators
Electric lines
Electric network analyzers
Electric potential
Optimal control systems
Power control
Pulse width modulation
