摘要
本文首先介绍了交直流混合输电时交流系统与直流系统的相互作用和影响,强调了与弱受端交流系统相连时保持交直流系统稳定的重要性,并引出提高这一稳定性的有力措施-电容换流器。接下来介绍了电容换相换流器的发展现状及其在直流工程中的应用。其次以我国计划建设的某直流联网工程为基础,利用电磁暂态仿真软件PSCAD/EMTDC搭建了CCC-HVDC系统仿真模型,开展了CCC-HVDC系统对弱受端交流系统动态性能的影响分析及安全稳定性研究。论文着重讨论了CCC-HVDC系统中串联电容C值的选取,CCC-HVDC系统的正常启停特性,CCC-HVDC系统的谐波特性,并与LCC-HVDC系统的相应特性进行比较分析。另外,重点比较了不同故障下LCC-HVDC系统与CCC-HVDC系统的不同响应情况。
理论研究和访真结果表明,CCC-HVDC系统的正常启动特性要优于LCC-HVDC系统,表现在各个变量达到额定状态的时间较短,启动过程中变量过冲幅值较小这两个方面;CCC-HVDC系统的谐波特性较为复杂,应与工程具体运行工况相结合进行分析;CCC-HVDC系统在联于弱交流系统时,具有较好的抗扰动能力和抑制换相失败的能力,能有效克服常规直流输电的缺点,但串联电容阀侧发生故障时,CCC-HVDC系统容易发生连续换相失败,暂态特性要差于LCC-HVDC系统。
Firstly, this paper introduced the interaction between ac system and dc system based on a ac-dc system, emphasized the importance of stability when dc system linked to a weak ac system, and leaded the capacitor commutation converter(CCC)-a effective measure to improve the stability. Secondly, the development situation of the capacitance commutation inverter and its application in HVDC are listed. And then, based on a certain dc net project planning to construct in china, the CCC-HVDC simulation model is built using the electro-magnetic transient simulation software PSCAD/EMTDC. Research on the dynamic performance influence and stability analysis of CCC when connecting to the weak AC system. This paper emphatically discussed the size selection of the commutation capacitor, the characteristics of normal start and stop of CCC-HVDC, the harmonic characteristic analysis of CCC-HVDC and compared with the LCC-HVDC. And the different responses between LCC-HVDC and the CCC-HVDC under the different faults are studied. The comparison shows that the CCC-HVDC have a better normal start characteristics than LCC-HVDC, and a higher operational stability during AC system disturbances, but the harmonic characteristic of CCC-HVDC should combine with the project operation condition.
引文
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