【作者】 高涛；

【导师】 马晓春；

【作者基本信息】 北京交通大学 ， 电气工程， 2012， 硕士

【摘要】 本文首先介绍电容换相换流技术的研究现状和工程优势,然后从电容换相换流器的数学模型入手分析电容换相换流器的原理。进而在PSCAD软件中搭建了CCC-HVDC与CSCC-HVDC模型,对这两个模型分别进行阶跃响应分析和临界短路比分析,并与传统LCC-HVDC模型的阶跃响应与临界短路比进行对比。通过稳态分析验证这两个新型系统的响应特性符合仿真要求。接下来在PSCAD软件中对联于弱受端交流系统的电容换相换流器进行动态性能分析和安全稳定性研究。本文着重研究CCC-HVDC与CSCC-HVDC的暂态特性及两个新型系统间的对比。仿真结果表明CCC-HVDC与CSCC-HVDC的稳态特性均优于LCC-HVDC,这是通过对系统的临界短路比分析得出的；电容换相换流系统在联于弱交流系统时,具有较好的抑制换相失败的能力和抗扰动的能力,这主要通过对电容换相换流系统的暂态分析得出；通过CCC-HVDC与CSCC-HVDC的对比分析可以知道,两个系统各有优劣,故障发生的位置会影响换流装置的响应特性和系统的运行特性,当故障位于换流变压器网侧时,CSCC-HVDC的响应特性比CCC-HVDC的响应特性好,而当故障位于变压器阀侧时,CCC-HVDC的响应效果比CSCC-HVDC要好。更多还原

【Abstract】 Firstly this thesis introduces the research status and engineering advantages of the capacitor commutated technology. Secondly analysis the operational principle of capacitor commutated converter by using mathematical model. Furthermore the two simulation models of CCC-HVDC and CSCC-HVDC are built in the PSCAD software. Research on the step response and critical SCR of these two models respectively, compares the results with the traditional LCC-HVDC model. Through the steady state analysis of these two new HVDC systems to verify their response characteristics meets the simulation requirements. Research on the dynamic performance and stability analysis capacitor commutated converter which connect with the weak AC system. This thesis emphatically discusses the transient features of CCC-HVDC and CSCC-HVDC simulation models, as well as the comparison of these two new models.The simulation results show that the steady state characteristics of the two new models are better than the LCC-HVDC model, which concluded from the analysis of critical SCR. Through the transient simulation concluded that the capacitor commutated converter can inhibit the commutation failure and disturbance effectively. When compared the CCC-HVDC to CSCC-HVDC, we find that the fault location will affect the model’s response characteristics and operation characteristics. While the failure is located near the grid side of the transformers, the response characteristics of CSCC-HVDC are better than CCC-HVDC, while the fault is located near the valve side of transformers, the CCC-HVDC response characteristics are better than CSCC-HVDC.更多还原