计及LCC-HVDC交直流系统静态电压稳定的综合短路比强度指标

发布时间：2018-07-25 17:06

【摘要】：针对过往电网换相换流器高压直流输电(line commutated converter based high voltage direct current,LCCHVDC)交直流系统的强度指标缺乏严密理论基础的问题,该文研究计及LCC-HVDC交直流系统静态电压稳定的强度指标定义方法。首先,定量分析单馈入LCC-HVDC系统不同控制方式对交直流系统静态电压稳定的影响。其次,提出一种能够衡量交直流系统电压稳定裕度的综合短路比(integrated short circuit ratio,ISCR)强度指标。该指标考虑了交直流系统的实际潮流信息,能够同时应用于交直流系统的规划、设计和运行阶段;兼顾了LCC-HVDC系统的直流功率电压动态特性,能够研究控制方式差异性对其影响;同时,基于静态电压稳定极限定义的临界综合短路比(critical integrated short circuit ratio,CISCR)指标取值恒为1,因而能够刻画互联交流电网对直流系统的临界电压支撑强度。最后,考虑额定运行工况和负荷动态变化过程的算例分析结果,及不同强度指标的对比分析,均表明了采用ISCR和CISCR指标的有效性。
[Abstract]:In order to solve the problem that the strength index of (line commutated converter based high voltage direct current HVDC (HVDC) AC / DC system is lack of strict theoretical basis, this paper studies the definition method of strength index considering static voltage stability of LCC-HVDC AC / DC system. Firstly, the influence of different control methods of single feed LCC-HVDC system on the static voltage stability of AC / DC system is analyzed quantitatively. Secondly, a comprehensive short-circuit ratio (integrated short circuit ratio-ISCR) intensity index which can measure voltage stability margin of AC / DC system is proposed. This index takes into account the actual power flow information of AC / DC system, and can be used in the planning, design and operation stages of AC / DC system at the same time, and the dynamic characteristics of DC power and voltage in LCC-HVDC system are also taken into account. Be able to study the effects of different control patterns on them; at the same time, The critical integrated short-circuit ratio (critical integrated short circuit) based on the definition of static voltage stability limit is always 1, so it can describe the critical voltage support strength of the interconnected AC network to DC system. Finally, the effectiveness of using ISCR and CISCR indexes is proved by considering the results of numerical examples of rated operating conditions and dynamic change of load, as well as the comparative analysis of different strength indexes.
【作者单位】：强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院);曼尼托巴大学电气与计算机工程系;
【基金】：国家留学基金资助
【分类号】：TM712;TM721.1

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