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Voltage-Sensor-Less Synchronization to Unbalanced Grids by Frequency-Adaptive Virtual Flux Estimation

机译:通过频率自适应虚拟通量估计实现不平衡电网的无电压传感器同步

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摘要

This paper proposes a simple method for inherently frequency-adaptive virtual flux (VF) estimation intended for voltage-sensor-less grid synchronization and control of voltage source converters. The frequency-adaptive characteristics are obtained by using a second-order generalized integrator configured as a quadrature signal generator (SOGI-QSG) with the grid frequency as an explicit input variable. It is also shown how the properties of VF estimation based on SOGI-QSGs can be utilized to achieve a simple and effective synchronization technique that integrates frequency-adaptive bandpass filtering, VF estimation, and symmetrical component sequence separation into one operation. This new method avoids cascaded delays of VF estimation and sequence separation and is labeled as dual SOGI-based VF (DSOGI-VF) estimation since it is based on two parallel SOGI-QSGs. The properties and performance of the DSOGI-VF estimation are analyzed in comparison to conventional configurations of VF estimation and sequence separation, demonstrating that it is a simpler structure with improved dynamic response. In fact, similar response time as for grid synchronization based on voltage measurements is achieved. The operation and performance of the proposed DSOGI-VF estimation method have been verified by laboratory experiments in a small-scale converter setup.
机译:本文提出了一种固有的频率自适应虚拟通量(VF)估计的简单方法,旨在用于无电压传感器的电网同步和电压源转换器的控制。频率自适应特性是通过使用配置为正交信号发生器(SOGI-QSG)的二阶广义积分器获得的,其中电网频率为显式输入变量。还显示了如何利用基于SOGI-QSG的VF估计的属性来实现一种简单有效的同步技术,该技术将频率自适应带通滤波,VF估计和对称分量序列分离集成到一个操作中。这种新方法避免了VF估计和序列分离的级联延迟,并且由于它基于两个并行的SOGI-QSG,因此被标记为基于双SOGI的VF(DSOGI-VF)估计。与传统的VF估计和序列分离配置相比,对DSOGI-VF估计的属性和性能进行了分析,表明它是一种具有改善的动态响应的简单结构。实际上,获得了与基于电压测量的电网同步相似的响应时间。拟议的DSOGI-VF估计方法的操作和性能已通过实验室实验在小型转换器设置中得到验证。

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