广东电网无功电压调控的典型问题及对策研究

发布时间：2018-05-29 01:24

本文选题：电压调控 + 关口无功　；参考：《华南理工大学》2014年硕士论文

【摘要】：随着电力系统互联的深入发展，大容量超高压直流输电的应用，分布式电源的并网，负荷快速而不均匀的发展以及负荷峰谷差的不断拉大，显著增大了广东电网无功电压耦合的复杂性，给大受端省级电网的无功电压调控带来了巨大的挑战和难度。本文在总结和分析主网和配电网无功电压调控典型问题的基础上，介绍了常用的几种无功电压调控手段，通过综述国内外无功电压调控在控制模式以及考核机制的研究现状，回顾配电网无功规划的研究概况及应用领域，归纳了无功电压调控的研究方法与解决思路。从广东电网无功电压考核指标欠协调、无功调控物质基础不足、VQC装置投入率较低、AVC系统运行经验欠缺、负荷特性的显著变化、网架结构出现的新特点以及小水电并网的影响等方面，探讨了广东电网无功电压调控问题形成的原因，在此基础上初步分析了广东电网无功电压调控问题的解决对策。主网方面，针对现有关口功率越来越不能适应电网的快速发展以及负荷快速增长的需求，提出了基于AVC系统的省地电网关口无功协调控制方法。首先引入平均协调功率因数限值(average coordination power factor limits，ACPF)指标定量评价省级电网的无功承受极限，接着基于电网分层解耦的理念，考虑省级电网无功安全裕度，片区负荷特性差异以及无功调控能力，提出了省地电网关口协调功率因数的整定方法，广东某区域电网仿真结果表明，所提方法有效解决了依赖专家经验以及全局优化计算获得AVC系统参数设定值所存在的局限性。配电网方面，考虑含小水电配电线路电压高企问题的解决措施存在工程实用性差等问题，提出了集中吸纳感性无功补偿方法，通过监测含小水电主干线的节点电压分布，并基于电压降落无功解耦算式，确定并联电抗器的优化补偿点，指导感性无功补偿的投切。仿真结果表明，，所提方法抑制含小水电配电线路电压抬升效果明显，兼具防盗和易于管理等特点，可操作性强，工程实用价值高。本论文的主要工作是在国家自然科学基金项目(51377060)和华南理工大学中央高校基本科研业务费专项资金资助项目(2013ZM0013)的资助下完成的。
[Abstract]:With the further development of power system interconnection, the application of large capacity UHV direct current transmission, the grid connection of distributed power source, the rapid and uneven development of load and the increasing of load peak and valley difference, The complexity of reactive power and voltage coupling in Guangdong power grid is greatly increased, which brings great challenges and difficulties to the regulation of reactive power and voltage in large receiving provincial power grid. On the basis of summing up and analyzing the typical problems of reactive power and voltage regulation in main network and distribution network, this paper introduces several commonly used reactive power and voltage regulation methods, and summarizes the research status of reactive power and voltage regulation in control mode and examination mechanism at home and abroad. The research situation and application field of reactive power planning in distribution network are reviewed, and the research methods and solutions of reactive power and voltage regulation are summarized. Based on the lack of coordination of reactive power and voltage assessment index in Guangdong power grid, the deficiency of material basis of reactive power regulation and the lack of experience in the operation of AVC system with lower input rate of VQC unit, the significant change of load characteristics is also presented. On the basis of the new characteristics of grid structure and the influence of small hydropower connected to power grid, the causes of reactive power and voltage regulation in Guangdong power network are discussed, and the countermeasures to solve the problem of reactive power and voltage regulation in Guangdong power network are analyzed preliminarily. In view of the fact that the existing gate power can not meet the needs of the rapid development of the power grid and the rapid growth of the load, a coordinated control method of reactive power at the gate of the provincial and ground power network based on AVC system is proposed. First, the average coordinated power factor limit average coordination power factor limits are introduced to quantitatively evaluate the reactive power tolerance limit of the provincial power grid, and then based on the concept of hierarchical decoupling, the reactive power safety margin of the provincial power grid is considered. Based on the difference of load characteristics and reactive power regulation ability, a method for setting power factor at the provincial and ground power grid level is proposed. The simulation results of a regional power network in Guangdong Province show that, The proposed method effectively solves the limitation of using expert experience and global optimization to obtain AVC system parameters. In distribution network, considering the problem of high voltage of distribution line with small hydropower, some problems such as poor engineering practicability, the method of concentrating inductive reactive power compensation is put forward to monitor the node voltage distribution of main line with small hydropower. Based on the decoupling formula of voltage drop reactive power, the optimal compensation point of parallel reactor is determined to guide the switching of inductive reactive power compensation. The simulation results show that the proposed method is effective in restraining voltage uplift of distribution lines with small hydropower stations, has the characteristics of anti-theft and easy to manage, and has strong maneuverability and high practical value in engineering. The main work of this paper is supported by the National Natural Science Foundation of China (51377060) and the Special Fund for basic Scientific Research operating expenses of the Central University of South China University of Technology (2013ZM0013).
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

【参考文献】