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Control of transformerless T-type DVR using multiple delayed signal cancellation PLL under unbalanced and distorted grid condition
Engineering Science and Technology, an International Journal ( IF 5.1 ) Pub Date : 2021-02-27 , DOI: 10.1016/j.jestch.2021.01.013
Kodari Rajkumar , P. Parthiban , Nalla Lokesh

In the near future, the power system network may experience severe voltage distortions due to association of renewable energy sources (RES), and the large penetration of power electronic based loads into the microgrid. To protect sensitive loads from these distorted and unbalanced grid conditions, the commonly used dynamic voltage restorer (DVR) requires effective control algorithms. The effective control algorithm comprises a controller, and accurate estimation of grid phase angle/frequency, and magnitude, thereby the reference DVR voltage is accurately estimated. The synchronous reference frame based phased locked loop (SRF-PLL) is commonly used for phase angle estimation. However, during unbalanced, distorted, and dc-offset conditions, the performance of SRF-PLL is unsatisfactory. To improve its performance, it is cascaded with prefilters such as dual second order generalized integrator (DSOGI), cascaded delayed signal cancellation (CDSC), and multiple delayed signal cancellation (MDSC). Among these prefilters, MDSC has superior performance under all grid conditions with less delay time and memory requirement. In addition to an effective control algorithm, the DVR system requires high power density converters. The power density of the system is increased using transformerless T-type converter. In this paper, the effectiveness of MDSC-PLL for the transformerless T-type converter based DVR is evaluated in MATLAB/Simulink for various grid conditions such as voltage sag/swell, unbalance voltage sag/swell, harmonics, and dc-offset.



中文翻译:

在电网不平衡和失真的情况下,使用多个延迟信号消除PLL对无变压器T型DVR进行控制

在不久的将来,由于可再生能源(RES)的结合以及基于电力电子的负载在微电网中的大量渗透,电力系统网络可能会遭受严重的电压畸变。为了保护敏感负载免受这些扭曲和不平衡的电网状况的影响,常用的动态电压恢复器(DVR)需要有效的控制算法。有效的控制算法包括控制器,以及对电网相角/频率和幅值的精确估计,从而可以精确地估计参考DVR电压。基于同步参考帧的锁相环(SRF-PLL)通常用于相位角估计。但是,在不平衡,失真和直流偏移情况下,SRF-PLL的性能不能令人满意。为了提高其性能,它与诸如双二阶广义积分器(DSOGI),级联延迟信号消除(CDSC)和多延迟信号消除(MDSC)之类的预滤波器级联。在这些预滤波器中,MDSC在所有网格条件下均具有卓越的性能,并且延迟时间和存储需求更少。除了有效的控制算法外,DVR系统还需要高功率密度转换器。使用无变压器T型转换器可以提高系统的功率密度。在本文中,在MATLAB / Simulink中针对各种电网条件(例如电压骤降/骤升,不平衡电压骤降/骤升,谐波和直流偏移)评估了MDSC-PLL对于基于无变压器T型转换器DVR的有效性。以及多重延迟信号消除(MDSC)。在这些预滤波器中,MDSC在所有网格条件下均具有卓越的性能,并且延迟时间和存储需求更少。除了有效的控制算法外,DVR系统还需要高功率密度转换器。使用无变压器T型转换器可以提高系统的功率密度。在本文中,在MATLAB / Simulink中针对各种电网条件(例如电压骤降/骤升,不平衡电压骤降/骤升,谐波和直流偏移)评估了MDSC-PLL对于基于无变压器T型转换器DVR的有效性。以及多重延迟信号消除(MDSC)。在这些预滤波器中,MDSC在所有网格条件下均具有卓越的性能,并且延迟时间和存储需求更少。除了有效的控制算法外,DVR系统还需要高功率密度转换器。使用无变压器T型转换器可以提高系统的功率密度。在本文中,在MATLAB / Simulink中针对各种电网条件(例如电压骤降/骤升,不平衡电压骤降/骤升,谐波和直流偏移)评估了MDSC-PLL对于基于无变压器T型转换器DVR的有效性。使用无变压器T型转换器可以提高系统的功率密度。在本文中,在MATLAB / Simulink中针对各种电网条件(例如电压骤降/骤升,不平衡电压骤降/骤升,谐波和直流偏移)评估了MDSC-PLL对于基于无变压器T型转换器DVR的有效性。使用无变压器T型转换器可以提高系统的功率密度。在本文中,在MATLAB / Simulink中针对各种电网条件(例如电压骤降/骤升,不平衡电压骤降/骤升,谐波和直流偏移)评估了MDSC-PLL对于基于无变压器T型转换器DVR的有效性。

更新日期:2021-05-06
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