A New Voltage Control Strategy to Improve Performance of DSTATCOM in Electric Grid

A new voltage control strategy of distribution static compensator(DSTATCOM)has been proposed in this paper for electric grid applications.The proposed control scheme combines two methods of DSTATCOM operation to improve its performance.Considering power factor and voltage magnitude as degree of freedom,the DSTATCOM provides features such as mitigation of voltage and current harmonics,balancing of source currents,improvement of power factor,voltage regulation during voltage sag and swell,reduction in inverter losses,and control of load power to achieve energy conservation.The performance of proposed DSTATCOM control is better as compared to its conventional operation at any time of operation.PSCAD simulation and experimental results validate the performances.

Reinforcement Learning-Empowered Graph Convolutional Network Framework for Data Integrity Attack Detection in Cyber-Physical Systems

The massive integration of communication and information technology with the large-scale power grid has enhanced the efficiency, safety, and economical operation of cyber-physical systems. However, the open and diversified communication environment of the smart grid is exposed to cyber-attacks. Data integrity attacks that can bypass conventional security techniques have been considered critical threats to the operation of the grid. Current detection techniques cannot learn the dynamic and heterogeneous characteristics of the smart grid and are unable to deal with non-euclidean data types. To address the issue, we propose a novel Deep-Q-Network scheme empowered with a graph convolutional network (GCN) framework to detect data integrity attacks in cyber-physical systems. The simulation results show that the proposed framework is scalable and achieves higher detection accuracy, unlike other benchmark techniques.

综述:利用柔性交流输电系统(FACTS)装置增强电力传输能力（英文）

全世界对电能的需求显著增长,但电能生产和传输能力却未相应提升。这导致电能消费者受多种问题困扰(如:电压和频率不稳定及电能质量问题)。为解决上述问题,需提升电力传输网的可用功率传输能力。世界各地的研究者采用柔性交流传输系统(FACTS)装置来提升这一能力。本文全面总结了FACTS控制器如何用于提升电力系统网的可用传输能力(ATC)和功率传输能力(PTC);针对不同因素,讨论不同FACTS设备的分类;结合相关统计结果,讨论FACTS设备的普及性和应用情况。此外,本文还包含六种主要FACTS装置的操作原理及其在提升ATC和PTC方面的应用。最后针对不同的控制算法,评估FACTS装置在提升ATC和PTC方面的性能。

A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

The demand of electricity and environmental issues associated with conventional power generation plants are increasing significantly.Modern technology has transformed the conventional power system through the integration of distributed generation(DG).With the help of modern power electronic technology,the conventional power system is able to support the integration of DGs based on renewable energy sources(RESs).The systematic combination of DGs with energy storage system forms a microgrid(MG),which can operate in islanded mode or grid-connected mode.The intermittent nature of RES and varying load pose substantial obstacles such as voltage and frequency instability,and the unreliability of RES.Unequal feeder impedances and non-linear loads are considered as present challenges in MG control.Hierarchical control has been useful in undertaking solutions to these issues.This paper covers the deep insight of different control methods applied at the primary and secondary control levels in hierarchical control.In primary control,the classification based on droop and non-droop controls is discussed.The virtual synchronization machine(VSM)based control method is reviewed.Voltage and frequency restoration control and economical operations at decentralized and centralized secondary control are analyzed in detail.Based on the existing literature,critical discussion on MG control and future trends are also presented to provide future research perspectives.

Two novel approaches of adaptive finite-time sliding mode control for a class of single-input multiple-output uncertain nonlinear systems

Some systems,in spite of having multiple outputs,have only one control input,which makes their control a challenge.Two novel controllers are proposed that utilise an adaptive finite-time sliding mode control(AFSMC)scheme for a class of single-input multiple-output(SIMO)nonlinear systems in the presence of unknown mismatched uncertainties.To alleviate the inherent chattering phenomenon of sliding mode control,new forms of the two designed controllers are suggested by using new sliding surfaces.Not only can the proposed AFSMC scheme stabilise the system in a finite time,but also it can provide estimated data of the uncertainty upper bound in the controller.Lyapunov stability theory is used to obtain finite-time stability analysis of the closed-loop system.Finally,simulation results are carried out in Simulink/MATLAB for a four-dimensional autonomous hyper-chaotic system with mismatched uncertainties as an example of SIMO uncertain nonlinear systems to reveal the effectiveness of the proposed controllers.