多馈入直流系统的无功配置优化研究

发布时间：2018-11-05 06:54

【摘要】：我国能源和生产力的逆向分布,决定了需要采取大规模长距离的输电模式。直流输电以其在大容量、长距离输电上的优势近年来尤其在我国得到了快速的发展。随着直流输电的广泛应用,交直流系统间的复杂相互作用使得电力系统的安全性问题较为突出。我国华东地区已经形成了有多条直流馈入的多馈入直流系统,这需要受端交流电网的坚强支撑。根据电压和无功的关系,提高多馈入直流系统安全性的最好方法就是进行动态无功补偿装置配置,但如何有效高效的进行动态无功配置,此方面的研究目前尚不完善。本文介绍了我国华东地区复杂多馈入直流系统所面临的问题,从无功对电压支撑的出发,确定了以系统电压薄弱区域作为动态无功补偿区域,结合已有的交流系统薄弱区域的选择方法,借鉴主导节点的概念,针对多馈入直流系统的特点,提出了寻找多馈入直流无功补偿主导节点作为动态无功配置点的方法。该方法重点考虑了交流系统对于直流系统的支撑效果,并用多馈入短路比设计权重因子衡量不同直流的重要性,同时也考虑了无功补偿对于其他交流节点的作用。然后在选点的基础上,进行了使用粒子群算法的动态无功补偿装置的容量优化。不同于传统的静态无功优化,本文方法基于动态仿真,用短路容量作为反映交流系统对直流系统支撑能力的指标,并以补偿容量作为罚函数,考虑了动态无功配置的性价比,使优化结果有效且高效。最后,通过算例分析验证了本文动态无功配置优化方法的有效,并用本文方法对苏南地区电网的动态无功优化配置进行了仿真分析,表明本文所提方法对于复杂电网系统的有效性和对实际规划的意义。
[Abstract]:The reverse distribution of energy and productivity determines the need for large-scale long-distance transmission. Direct current transmission (HVDC) has been developing rapidly in recent years, especially in China, because of its advantages in large capacity and long distance transmission. With the wide application of DC transmission, the complex interaction between AC and DC system makes the security problem of power system more prominent. A multi-fed DC system with multiple DC feeders has been formed in East China, which needs strong support from the end AC power grid. According to the relationship between voltage and reactive power, the best way to improve the security of multi-fed DC system is to configure the dynamic reactive power compensator, but how to effectively and efficiently configure the dynamic reactive power is not perfect. This paper introduces the problems faced by complex multi-input DC system in East China. From the point of reactive power to voltage support, the weak voltage region of the system is determined as the dynamic reactive power compensation area. Based on the existing methods of selecting weak area of AC system and referring to the concept of leading node, a method to find the dominant node of multi-fed DC reactive compensation as a dynamic reactive power assignment point is put forward according to the characteristics of multi-infeed DC system. In this method, the support effect of AC system for DC system is considered, the importance of different DC is measured by the weight factor of multi-feed short circuit ratio design, and the effect of reactive power compensation on other AC nodes is also considered. Then on the basis of selecting points, the capacity of dynamic reactive power compensator using particle swarm optimization algorithm is optimized. Different from the traditional static reactive power optimization, based on dynamic simulation, the short-circuit capacity is used as the index to reflect the support ability of AC system to DC system, and the compensation capacity is taken as penalty function, and the performance-price ratio of dynamic reactive power allocation is considered. The optimization results are effective and efficient. Finally, the effectiveness of the dynamic reactive power allocation optimization method is verified by a numerical example, and the simulation analysis of the dynamic reactive power optimal configuration in the southern Jiangsu power network is carried out by using the method in this paper. The results show that the method proposed in this paper is effective for complex grid systems and has great significance for practical planning.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM714.3

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