江西电网AVC系统调压装置动作行为分析和改进措施研究

发布时间：2018-05-23 11:52

本文选题：AVC + 电压无功控制　；参考：《华中科技大学》2016年硕士论文

【摘要】：自动电压控制(AVC)是一个重要的电压无功调控手段,不仅提升了系统的电压电平,并提升了系统的经济效率。但是由于电压、无功自身的非线性特征,增加了其实现的繁杂性。江西电网地调110kV及以上变电站大部分接入AVC系统,接入率是94%,变电站闭环运行比例相对低一点,闭环率为85%,接入率和闭环率良好。然而,通过对江西省各地市电网AVC系统及调压装置的调研,发现其AVC系统调压装置动作频繁,远远超过了国家标准规定的次数。这不仅不利于电网智能化水平的提高,还增加了运行人员的工作强度。本文首先分析了变电站电压无功控制的理论基础,然后进一步对比分析了AVC系统的九区图控制策略和十七区图控制策略,指出了九区图控制策略的不足以及十七区图控制策略的改进控制效果,为后续的分析和建模奠定根基。接着通过对江西省赣州公司、南昌公司和抚州公司2015年5月份所有调压设备每天动作次数进行统计,获得所有电容器和主变分接头动作频繁率及当月一天最大动作次数,从而指出江西省地调AVC系统调压装置动作频繁。然后重点针对AVC系统调压装置频繁动作的实际情况,分析了造成这种现状的四个主要原因,包括控制方式问题、运行定值范围问题、装置问题和运维管理问题。为了解决江西省地调AVC系统调压装置动作频繁的问题,本文在MATLAB上,利用模糊逻辑工具箱实现了江西省抚州市黄州变的AVC控制系统调压装置的仿真建模,并和实际运行情况进行了对比,检验了模型的正确性。最后,针对造成江西省地调AVC系统调压装置动作频繁的原因,本文提出了相应的对策,并在仿真模型上验证了提出的对策的效果。
[Abstract]:Automatic voltage control (AVC) is an important means of voltage and reactive power regulation, which not only improves the voltage level of the system, but also improves the economic efficiency of the system. However, because of the voltage and the nonlinear characteristics of reactive power itself, the complexity of its realization is increased. Most of the substations of 110kV and above in Jiangxi power network are connected to AVC system, the access rate is 94, the closed loop operation ratio of substation is relatively low, the closed loop rate is 85, and the access rate and closed loop rate are good. However, through the investigation of the AVC system and the voltage regulating device in Jiangxi power grid, it is found that the voltage regulating device of the AVC system moves frequently, which far exceeds the number of times stipulated by the national standard. This is not only unfavorable to the improvement of the intelligent level of the power grid, but also increases the working intensity of the operators. In this paper, the theoretical basis of voltage and reactive power control in substation is analyzed firstly, and then the control strategy of nine-zone diagram and 17-zone diagram of AVC system are compared and analyzed. This paper points out the deficiency of the control strategy of the nine-area graph and the improved control effect of the control strategy of the 17-area graph, which lays the foundation for the subsequent analysis and modeling. Then through the statistics of the daily action times of all the voltage regulating equipments in Ganzhou Company, Nanchang Company and Fuzhou Company of Jiangxi Province in May 2015, the frequency of action frequency of all capacitors and main transformer joints and the maximum number of actions per day of that month were obtained. It is pointed out that the voltage regulating device of AVC system in Jiangxi Province is frequently operated. Then, according to the actual situation of the frequent operation of the voltage regulator in AVC system, four main reasons are analyzed, including the control mode problem, the operation fixed range problem, the device problem and the operation and maintenance management problem. In order to solve the problem of the frequent operation of the voltage regulating device of the ground AVC system in Jiangxi Province, the simulation modeling of the voltage regulating device of the AVC control system of Huangzhou transformer in Fuzhou, Jiangxi Province, is realized by using the fuzzy logic toolbox on the MATLAB in this paper. The correctness of the model is verified by comparing it with the actual operation. Finally, in view of the causes of the frequent operation of the AVC system in Jiangxi Province, this paper puts forward the corresponding countermeasures, and verifies the effectiveness of the proposed countermeasures on the simulation model.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM63;TM761.12

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