Nowadays, power quality (PQ) issues are gaining considerable attention to both electrical utilities and end-users as they are causing significant financial losses to industrial customers. Among PQ issues, voltage sag and swell are the most important and frequently occurring problems for sensitive load. Voltage sag/swell can be mitigated using a distribution static compensator (DSTATCOM), which is fast, effective, and flexible custom power device. Its performance mostly depends upon the designed control scheme for the switching of voltage source converter (VSC). In this research work, a fused control scheme based on second-order super twisting algorithm (STA) and sliding mode control (SMC) for VSC of DSTATCOM is developed, that can effectively eliminate the effects of voltage sag/swell as well as compensate active and reactive power in distribution system. STA along with standard SMC is used to eliminate the chattering effect which is the drawback of SMC alone, while keeping its other properties such as robustness, faster response time, and insensitive to load variation. The proposed control scheme for DSTATCOM is simulated on SimPower system toolbox of MATLAB/Simulink. Both linear as well as nonlinear loads have been considered for the purpose of static and dynamic analysis. Simulation results show that the super twisting sliding mode control (STSMC) for DSTATCOM can effectively detect and correct voltage sag/swell and compensate active and reactive power within 2.5 milliseconds as per semiconductor processing equipment voltage sag immunity standard for sensitive load (SEMI F-47 Standard). Total harmonic distortions (THD) measured in all simulated cases is found to be less than 5%. The frequency response analysis shows good stability properties of developed system. A comparison analysis is also carried out between the classical SMC and the proposed STSMC, in which the proposed algorithm with SMC shows better performance than classical SMC.

中文翻译：

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超扭滑模控制配电静态补偿器改善配电系统电能质量

如今，电力质量 (PQ) 问题正引起电力公司和最终用户的极大关注，因为它们给工业客户造成了重大的经济损失。在 PQ 问题中，电压骤降和骤升是敏感负载最重要和最常发生的问题。使用配电静态补偿器 (DSTATCOM) 可以减轻电压骤降/骤升，这是一种快速、有效且灵活的定制电源设备。其性能主要取决于设计的电压源转换器 (VSC) 开关控制方案。在这项研究工作中，针对 DSTATCOM 的 VSC，开发了一种基于二阶超扭曲算法 (STA) 和滑模控制 (SMC) 的融合控制方案，可有效消除电压骤降/骤升的影响，补偿配电系统的有功和无功功率。STA 与标准 SMC 一起用于消除颤振效应，这是单独 SMC 的缺点，同时保持其其他特性，例如稳健性、更快的响应时间和对负载变化不敏感。所提出的 DSTATCOM 控制方案在 MATLAB/Simulink 的 SimPower 系统工具箱上进行了仿真。出于静态和动态分析的目的，已经考虑了线性和非线性载荷。仿真结果表明，DSTATCOM 的超扭转滑模控制（STSMC）可以有效地检测和纠正电压骤降/骤升，并在 2.0 以内补偿有功和无功功率。5 毫秒，符合敏感负载的半导体加工设备电压骤降抗扰度标准（SEMI F-47 标准）。发现在所有模拟情况下测得的总谐波失真 (THD) 小于 5%。频率响应分析表明开发的系统具有良好的稳定性能。还对经典 SMC 和提出的 STSMC 进行了比较分析，其中提出的 SMC 算法比经典 SMC 表现出更好的性能。