配电台区广义无功补偿技术的研究与实现

发布时间：2018-05-15 19:38

本文选题：配电台区 + 广义无功补偿　；参考：《西安理工大学》2017年硕士论文

【摘要】：配电台区系统直接面向终端用户,是服务民生的重要基础设施及未来清洁能源并网的重要节点,对承载和推进国家“互联网+”智慧能源战略具有重要意义。目前,由单相大容量负荷时空分布不合理及感性负荷增多带来的三相负荷不平衡及无功不平衡问题是影响配电台区运行的两大主要问题。本课题针对这两个问题,结合配电台区系统采用三相四线制供电方式、接地与不接地负荷共存等特点,基于对称分量法研究并实现以TSC (晶闸管投切电容器)支路为基本补偿结构的综合补偿无功及三相不平衡的配电台区广义无功补偿技术。主要研究工作及结论如下。简要介绍了配电台区的组成、特点,分析了配电台区无功及三相不平衡产生的原因及危害,结合配电台区无功及三相不平衡治理现状,提出利用广义无功补偿技术综合治理配电台区无功及三相负荷不平衡。分析单相TSC结构及其补偿无功的原理,以单相TSC为基本支路研究配电台区广义无功补偿装置主电路的结构,即采用△补偿回路与Y补偿回路结合的方式。在此基础上,对TSC主电路进行研究及设计,选择电容器组的配置方式为二进制分组方式,最佳投入阈值系数与切除阈值系数为0.6,在晶闸管两端电压过零时投切。研究常用的三种广义无功补偿算法,结合配电台区广义无功补偿装置主电路结构,选择对称分量法为基本算法,根据补偿后系统只存在正序有功电流的特点,研究符合配电台区系统特点及主电路结构的配电台区广义无功动态补偿模型,根据此模型,仅需测量系统三相有功功率及无功功率即可求出主电路中各补偿电容的容量。并通过simulink仿真,使得广义无功补偿装置主电路结构及补偿算法的正确性得以验证。完成以dsPIC30F6014A与CPLD为核心的配电台区广义无功补偿装置控制部分硬件电路设计和软件编程,实现配电台区系统电参数的采集、补偿装置主电路的控制及保护功能。并结合工程化及实用化的思想,对配电台区广义无功补偿装置进行实验验证。实验结果表明,本文所研究的配电台区广义无功补偿技术能准确补偿配电台区系统的无功和三相不平衡。
[Abstract]:The radio distribution area system is directly oriented to the end users. It is an important infrastructure to serve the people's livelihood and an important node to connect clean energy in the future. It is of great significance to carry out and promote the intelligent energy strategy of the country's "Internet". At present, the unbalance of three-phase load and reactive power imbalance caused by the unreasonable space-time distribution of single-phase and large-capacity load and the increase of inductive load are the two main problems affecting the operation of distribution station area. In view of these two problems, this paper combines the characteristics of three-phase four-wire power supply system and coexistence of grounding and ungrounded load in the distribution station area system. Based on the symmetrical component method, the generalized reactive power compensation technique in the distribution station is studied and realized with TSC (thyristor switched capacitor) branch as the basic compensation structure and three-phase imbalance. The main research work and conclusions are as follows. This paper briefly introduces the composition and characteristics of the distribution station area, analyzes the causes and hazards of reactive power and three-phase imbalance in the distribution station area, and combines with the current situation of reactive power and three-phase imbalance control in the distribution station area. The generalized reactive power compensation technique is used to comprehensively control the imbalance of reactive power and three-phase load in the distribution station area. Based on the analysis of single-phase TSC structure and the principle of reactive power compensation, the structure of the main circuit of the generalized reactive power compensation device in the distribution station area is studied with the single-phase TSC as the basic branch, that is, the compensation loop is combined with the Y compensation circuit. On this basis, the main circuit of TSC is studied and designed. The configuration of capacitor bank is binary grouping mode, the optimal input threshold coefficient and excising threshold coefficient is 0.6, and the voltage at both ends of the thyristor is switched over 00:00. In this paper, three common generalized reactive power compensation algorithms are studied. Combined with the main circuit structure of the generalized reactive power compensation device in the distribution station area, the symmetric component method is chosen as the basic algorithm. According to the characteristic that only positive sequence active current exists in the compensated system, The generalized reactive power compensation model of the distribution station is studied, which accords with the characteristics of the radio distribution area system and the structure of the main circuit. According to this model, the capacity of the compensation capacitors in the main circuit can be obtained only by measuring the three-phase active power and reactive power of the system. Through simulink simulation, the correctness of the main circuit structure and compensation algorithm of the generalized reactive power compensation device is verified. The hardware circuit design and software programming of the control part of the generalized reactive power compensation device in the distribution station area based on dsPIC30F6014A and CPLD are completed. The collection of electrical parameters in the distribution station area and the control and protection function of the main circuit of the compensation device are realized. Combined with the idea of engineering and practicality, the generalized reactive power compensation device in the distribution station area is verified experimentally. The experimental results show that the generalized reactive power compensation technique studied in this paper can accurately compensate the reactive power and three-phase imbalance of the radio distribution area system.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.3

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