SVG和电容器组配合解决复杂电能质量问题的研究

发布时间：2018-05-30 21:09

本文选题：SVG + 电容器组　；参考：《福州大学》2014年硕士论文

【摘要】：本文以变电站内电能质量为研究对象,通过变电站增设动态无功补偿及谐波治理装置SVG配合站内电容器组对站内电能质量进行治理,同时比对SVG投运前后的变电站内电能质量的测量数据,并根据测量结果及数据比对对电能质量问题进行分析及研究。首先根据SVG装置控制机理,以链式H桥大功率电压逆变器为核心,通过调节其输出电压幅值与系统电压幅值的关系来确定输出功率的性质与容量,当其幅值(和相位)大于系统侧电压幅值(和相位)时输出容性无功,反之,输出感性无功。SVG装置采用先进的链式电路拓扑结构和单极倍频移相载波脉宽调制技术(CPS-SPWM),一个周波内开关多次,通过多个链节的移相叠加,使输出电压接近正弦波。最终实现实现以下功能：以功率因数控制为目标,能提供连续的感性到容性的无功补偿；提供恒电压控制功能,抑制系统过电压,改善系统电压稳定性；在负荷侧,提高功率因数、降低电压波动和负荷谐波。通过SVG装置投运后实测,以验证投入SVG装置后对电能质量的改善效果。实测表明,SVG装置的投运,提高了母线功率因数和降低电压波动；降低母线谐波电流；功率因数提高到0.99-1。这一措施有效的改善了实验变电站的电能质量。
[Abstract]:In this paper, the power quality in the substation is treated by adding dynamic reactive power compensation and harmonic control device SVG to the capacitor bank in the substation. At the same time, the power quality measurement data of substation before and after SVG are compared, and the power quality problem is analyzed and studied according to the measurement results and data comparison. Firstly, according to the control mechanism of SVG, the property and capacity of output power are determined by adjusting the relationship between the output voltage amplitude and the voltage amplitude of the system, taking the chain H-bridge high-power voltage inverter as the core. When the amplitude (and phase) is larger than the amplitude (and phase) of the voltage at the system side, capacitive reactive power is output. The output inductive reactive power. SVG device adopts advanced chain circuit topology and monopole frequency-shifted phase shift carrier pulse width modulation technique. The output voltage is close to sine wave through the phase-shifting superposition of multiple links through a Zhou Bo internal switch. Finally realize the following functions: take power factor control as the goal, can provide continuous inductive to capacitive reactive power compensation; provide constant voltage control function, suppress system overvoltage, improve system voltage stability; at load side, Improve power factor and reduce voltage fluctuation and load harmonics. In order to verify the effect of power quality improvement after putting SVG into operation, the SVG device is tested. The test results show that the operation of SVG increases the bus power factor and reduces the voltage fluctuation, reduces the harmonic current of the bus, and increases the power factor to 0.99-1. This measure effectively improves the power quality of the experimental substation.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TM53

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