基于RTDS的VDCOL控制仿真研究

RTDS-based Simulation Analysis of VDCOL Control

在常规高压直流输电控制系统中,低压限流(VDCOL)对直流输电暂态稳定以及交流系统电压稳定有重要的影响。本文基于RSCAD/RTDS实时数字仿真平台,分析VDCOL的设置参数对直流和交流系统稳定性的影响,提出VDCOL变斜率控制的仿真验证方法,建立动态调节VDCOL参数的实时仿真模型,并研究了依赖直流电压的VDCOL(DC-VDCOL)和依赖交流电压的VDCOL(AC-VDCOL)两种控制类型对直流和交流系统稳定性的影响,得出AC-VDCOL有利于系统稳定性的结论。

In conventional HVDC transmission control systems, Voltage Dependent Current OrderLimit （VDCOL） has an important influence on transient stability of HVDC and voltage stability ofAC system. Based on Real Time Digital Simulation platform RSCAD/RTDS, the effect of parameterssetting of VDCOL on the stability of the DC and AC system is analyzed in this paper, the VDCOLverification method to change the slope of I-U characteristics is put forward, and the simulationmodel for dynamically regulating the parameters of VDCOL is established. The various influencesfrom DC Voltage Dependent Current Order Limit （DC-VDCOL） and AC Voltage Dependent CurrentOrder Limit （AC-VDCOL） on the stability of the DC and AC system are studied and the contribu.tion of AC-VDCOL to stabilize the system is verified.