新型SVG静止无功发生器在保定地区电网中的应用研究

发布时间：2018-04-18 21:23

本文选题：无功功率 + 无功功率补偿　；参考：《华北电力大学》2017年硕士论文

【摘要】：当前,科学理论不断发展,技术水平不断提高,用电设备要求更高的电能质量。因此,以保障电能质量为前提,以确保电力系统供应稳定、运行安全、节能经济为核心,最大幅度地提升各种用电设备的用电效率,已成为电力技术发展的重要方向。通过安装各种无功功率补偿装置及设备,用以减少供电设备需要输出的无功功率,增强负荷能力,减少单位成本;通过提升负荷和供电用电系统整体的功率因数,用以降低有功功率损耗。除此以外,保持电网系统的电压稳定,控制电网系统的网频波动等方面都成为发电、输电、配电维持正常运行的不可或缺的重要因素。本文针对保定地区电网的无功功率补偿问题,在静止无功发生器的补偿方法、控制方式、补偿策略等方面对SVG静止无功发生器的技术及应用现状进行了分析。研究一种新型的无功补偿设备SVG型静止无功发生器,研究有效的控制平台和高效率的电力电子变流装置的控制算法,设计数字化控制保护系统,探讨高电压功率模块设计工艺,以实现实时跟踪电网参数的变化,并根据此变化来控制输出无功的大小和性质,达到在最短的时间内降低线路损耗,提高功率因数,稳定电压水平,消除电网电压的波动和闪变的目的。运行结果表明,通过使用自适应阶梯调制策略,利用双傅立叶变换实时分析连接阻抗电压矢量中23次以下谐波成分,按指定谐波消除方法调整链式结构各单元单相H桥各IGBT门极脉冲序列;内置SVG群控与交互适应接口计算模型,适应含SSSC、SVC等FACTS元件的电网动态调整;逐周波分析与系统连接阻抗三相电压矢量,自动附加变压器直流偏磁控制量,使无功潮流有效平衡,线路损耗大幅降低,功率因数充分提高,电网稳定性不断增强。
[Abstract]:At present, with the development of scientific theory and the improvement of technical level, electric equipment requires higher power quality.Therefore, to ensure the power quality as the premise, to ensure the power system supply stability, operation safety, energy-saving economy as the core, to maximize the efficiency of various electrical equipment, has become an important direction of power technology development.By installing various reactive power compensation devices and equipment to reduce the reactive power output required by the power supply equipment, to enhance the load capacity and reduce the unit cost, and by increasing the load and the overall power factor of the power supply system,Used to reduce the loss of active power.In addition, maintaining the voltage stability of the power system and controlling the frequency fluctuation of the power system have become the indispensable and important factors for the generation, transmission and distribution to maintain the normal operation.Aiming at the problem of reactive power compensation in Baoding power network, this paper analyzes the technology and application status of SVG static Var Generator in the aspects of compensation method, control mode and compensation strategy.This paper studies a new type of reactive power compensator SVG static Var Generator, studies the effective control platform and the control algorithm of the high efficiency power electronic converter, designs the digital control and protection system, and discusses the design process of the high voltage power module.In order to track the change of power network parameters in real time, and control the size and property of output reactive power according to this change, it can reduce the line loss, improve the power factor and stabilize the voltage level in the shortest time.The purpose of eliminating voltage fluctuation and flicker.The results show that by using the adaptive step modulation strategy, the harmonic components below the 23rd order in the connected impedance voltage vector are analyzed in real time by using the double Fourier transform (DFT).The single-phase H-bridge IGBT gate pulse sequence is adjusted according to the specified harmonic elimination method, and the SVG group control and interactive adaptive interface calculation model is built in to adapt to the dynamic adjustment of the power network with FACTS elements such as SSSC-SVC.Zhou Bo analyzes and connects impedance three-phase voltage vector with the system, and automatically adds DC bias control quantity of transformer, which makes reactive power flow balance effectively, line loss is greatly reduced, power factor is fully improved, and power network stability is continuously enhanced.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12

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