基于尖峰负荷模型辨识的台区低电压治理方法研究

发布时间：2018-06-01 02:24

本文选题：负荷辨识 + 低电压　；参考：《昆明理工大学》2017年硕士论文

【摘要】：在季节性大负荷、日用电尖峰时段,城乡结合部地区、农村低压400V台区长线路会因线路有功压降过大在用户侧产生低电压问题。低电压问题的频繁出现严重影响了居民的正常生活用电,阻碍着地区经济的发展。为了合理解决低电压问题,传统的手段有400V台区改造、加装JP柜无功补偿类设备和串联调压器,或是对上级电网进行线路串补技术和10kV线路加装串联调压器等。但是传统的400V台区改造涉及经济性与需求性的要求,特定线路对于无功补偿的需求差异性较大。出于对配电网安全稳定运行的考虑,10-35kV串补技术和串联调压器的应用目前相对较少,使得台区总体的低电压治理效果不是很理想。本文在对台区低电压问题的成因进行分析后,将台区低电压问题的治理研究主要集中于对400V线路有功压降过大而导致的低电压问题进行分析研究,具体研究治理低电压问题的400V线路串联调压器方案。但是计及串联调压器对不同类型负荷调压效果不同,升压时存在拉低首端电压的情况,其低电压治理效果难以保证。基于上述问题本文首先考虑400V台区线路的实际接线形式,研究台区配电线路的合理分段等效方法并建立台区仿真模型,分析串联调压器接入对400V台区电压分布的影响;然后针对不同负荷模型对串联调压器调压效果存在较大影响问题,研究了以“四合一”计量数据为基础的尖峰负荷类型比重辨识方法,依据对负荷类型比重的辨识建立台区尖峰负荷模型。基于卡尔曼滤波短期负荷预测原理,对台区负荷类型比重进行了为期五天的预测分析,建立实例仿真模型并分析串联调压器不同位置接入对线路电压变化影响。最后针对尖峰负荷下的串联调压器动作特性,研究串联调压器接入点的合理选择方法。最终,根据理论研究与仿真结论选取云南一实际存在低电压问题的400V台区接入了串联调压器。结合实际工程结果验证了本文研究方法的可行性。
[Abstract]:In the seasonal heavy load, the peak period of daily power consumption, the low voltage problem of the long line in the rural low voltage 400V area will be caused by the excessive active power drop of the line in the area of the combination of urban and rural areas. The frequent occurrence of low-voltage problem seriously affects the normal life of residents and hinders the development of regional economy. In order to solve the problem of low voltage reasonably, the traditional methods include the reconstruction of 400V unit, the installation of reactive power compensation equipment of JP cabinet and the series voltage regulator, or the line series compensation technology of superior power network and the installation of series voltage regulator on 10kV line, etc. But the traditional reconstruction of 400V station area involves the requirements of economy and demand, and the demand for reactive power compensation for specific lines is quite different. Due to the consideration of safe and stable operation of distribution network, the application of 10-35 kV series compensation technology and series voltage regulator is relatively few, which makes the overall low voltage control effect of the station area not very ideal. After analyzing the causes of the low voltage problem in the station area, the research on the treatment of the low voltage problem in the station area is mainly focused on the analysis and study of the low voltage problem caused by the excessive active power voltage drop on the 400V transmission line. This paper studies the scheme of 400 V line series voltage regulator to deal with low voltage problem. But considering that the voltage regulation effect of series voltage regulator is different to different types of load, the low voltage control effect is difficult to guarantee because of the situation that the voltage at the end of the voltage is lowered when the voltage is raised. Based on the above problems, this paper firstly considers the actual connection form of 400V transmission line, studies the reasonable section equivalent method of the distribution line in the station area and establishes the simulation model of the station area, and analyzes the influence of the connection of the series voltage regulator on the voltage distribution of the 400V station. Then, aiming at the problem that different load models have great influence on the voltage regulation effect of series voltage regulator, a method of identifying the proportion of peak load type based on "four-in-one" measurement data is studied. Based on the identification of the specific gravity of the load type, the peak load model of the station is established. Based on the Kalman filter short-term load forecasting principle, the paper makes a five-day forecasting analysis on the specific gravity of the load type in the station area, establishes a simulation model and analyzes the influence of the different position access of the series voltage regulator on the line voltage change. Finally, according to the operation characteristics of series voltage regulator under peak load, the reasonable selection method of the access point of series voltage regulator is studied. Finally, according to the theoretical research and simulation results, a 400V station with actual low voltage problem is selected to connect the series voltage regulator. The feasibility of the method is verified by practical engineering results.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM743;TM714.3

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