直流分量对正弦幅值积分器同步信号检测方法的影响及其抑制方法

发布时间：2018-05-16 14:50

本文选题：同步信号 + 直流分量　；参考：《中国电机工程学报》2014年24期

【摘要】：三相并网变流器的控制需要电网基波电压同步信号的确准检测,正弦幅值积分器锁频环(frequency-locked loop based on sinusoidal amplitude integrator,SAI-FLL)是一种结构简单、性能良好的同步信号检测方法。文中首先分析了当输入信号含有直流分量时,正弦幅值积分器锁频环的性能,分析结果表明,输入直流分量会在正序幅值和频率信号中产生工频波动,负序幅值中还会产生附加直流分量。文中提出一种抑制直流分量影响的方法,该方法将直流分量作为频率为零的交流分量,利用正弦幅值积分器(sinusoidal amplitude integrator,SAI)的选频特性,形成统一的SAI方法,控制结构简单。理论分析和实验结果都表明,文中提出的方法可以在电网不平衡和频率变化等情况下消除直流分量的影响,并快速准确地提取电网电压基波正负序分量的幅值和相位,实现同步信号的检测。
[Abstract]:The control of three-phase grid-connected converter requires the synchronous signal of fundamental voltage of power network to be accurately detected. The frequency-locked loop based on sinusoidal amplitude integrator (SAI-FLLLL) with sinusoidal amplitude integrator is a simple and good synchronous signal detection method. In this paper, the performance of frequency locking loop of sinusoidal integrator is analyzed when the input signal contains DC component. The analysis results show that the input DC component will produce power frequency fluctuation in the sinusoidal amplitude and frequency signal. Additional DC components will also be generated in the negative sequence amplitude. In this paper, a method to suppress the influence of DC component is presented. In this method, the DC component is regarded as the AC component with zero frequency, and the frequency selection characteristic of sinusoidal amplitude integrator (SAI) is used to form a unified SAI method with simple control structure. The theoretical analysis and experimental results show that the proposed method can eliminate the influence of DC component in the case of power grid imbalance and frequency change, and can quickly and accurately extract the amplitude and phase of the fundamental and negative sequence components of power grid voltage. The synchronous signal detection is realized.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【基金】：国家自然科学基金项目(51277191) 重庆市杰出青年科学基金项目(CSTC2012JJJQ90004) 输配电装备及系统安全与新技术国家重点实验室重点项目(2007DA10512711101)~~
【分类号】：TM711

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