轻型高压直流输电系统的仿真与故障分析

轻型高压直流输电（high voltage direct current light,HVDC Light）是一种基于电压源换流器（voltage sourced converters,VSC）和脉冲宽度调制技术的新型直流输电形式,其运行控制简单,输出波形好,解决了传统高压直流输电换相困难,两端必须采用有源电源等问题。分析了HVDC Light系统的结构及基本原理,针对定直流电压和定有功功率的控制方式,构建了HVDC Light系统的MATLAB仿真模型;分析了系统的功率和直流电压的稳态特性,并针对几种常见的交流侧物理量扰动和三相短路故障进行了仿真分析。结果表明,受到扰动后的系统能够在0.3 s左右恢复稳态。仿真结果证明了HVDC Light系统的可行性和仿真模型的正确性,为HVDC Light系统的实际应用提供了参考。

Simulation and Fault Analysis of HVDC Light System

High Voltage Direct Current Light （HVDC Light） is a new DC transmission mode based on voltage source converter and pulse-width modulation techniques, who has simple operation control, good output waveform, and can solve the difficulties of traditional HVDC transmission line such us phase change problems, must using active power at two ends, etc. Firstly, this paper analyzed the structure and basic principle of HVDC Light system, constructed MATLAB simulation model of HVDC Light system according to the control modes of 13（2 voltage and active power. Then, the steady-state characteristics of the system＇ s power and DC voltage were analyzed, and simulation analysis was carried out for several different common physical disturbances at AC side and three-phase short circuit faults. The results show that the system can be restored to steady state in about 0. 3 s after disturbance. The simulation results prove the feasibility of HVDC Light systems and the correctness of the simulation model, which can provide references for the practical application of HVDC Light system.