The World Meteorological Organization estimates that about 90 percent of all natural disasters is extreme meteorological hazards like typhoon/hurricane and tropical cyclone triggered disasters. With the increasing ten...The World Meteorological Organization estimates that about 90 percent of all natural disasters is extreme meteorological hazards like typhoon/hurricane and tropical cyclone triggered disasters. With the increasing tendency of natural hazards, the typhoon induced surge, wave, precipitation, flood and wind as extreme external loads menacing Nuclear Power Plants (NPP) in coastal and inland provinces of China. For all of the planned, designed and constructed NPP in China the National Nuclear Safety Administration of China and IAEA recommended Probable Maximum Hurricane/ Typhoon/(PMH/T), Probable Maximum Storm Surge (PMSS), Probable Maximum Flood (PMF), Design Basis Flood (DBF) as safety regulations recommended for NPP defense infrastructures. This paper discusses the joint probability analysis of simultaneous occurrence typhoon induced extreme external hazards and compared with IAEA 2003-2011 recommended safety regulations for some NPP along China coast to make safety assessment based on the “As Low As Reasonable Practice” (ALARP) principle.展开更多
随着可再生能源比例增加,电网新建储能电站成为提升系统频率稳定性的重要手段。针对电网中分布式储能电站(distributedenergystoragestations,DESS)参与一次调频面临的荷电状态均衡问题,提出了一种考虑荷电状态(state of charge,SOC)一...随着可再生能源比例增加,电网新建储能电站成为提升系统频率稳定性的重要手段。针对电网中分布式储能电站(distributedenergystoragestations,DESS)参与一次调频面临的荷电状态均衡问题,提出了一种考虑荷电状态(state of charge,SOC)一致性的DESS协同控制策略。首先,构建了含分布式储能电站的区域电网调频模型,分析了传统调频控制方法的特点,并讨论了储能在高渗透率新能源电网中的调频及一致性控制需求;其次,分析了电网调频需求与DESS的SOC一致性调整需求之间的耦合关系,设计了基于一致性原理的SOC分布式控制策略,进而构建了兼顾两种需求的DESS一次调频协同控制方法,详细分析了关键控制参数的设计原则与取值方法。最后,搭建典型区域电网模型,结合不同频率波动工况进行了仿真验证,结果表明:所提控制策略可以有效改善电网频率质量,在不增加系统调频负担的前提下实现多个储能电站的SOC一致性调节,减小了DESS集群的SOC越限风险,增强了其聚合控制效果。展开更多
This paper investigates the cooperative output regulation problem of heterogeneous linear multi-agent systems over directed graphs with the constraint of communication bandwidth.Given that there exists an exosystem wh...This paper investigates the cooperative output regulation problem of heterogeneous linear multi-agent systems over directed graphs with the constraint of communication bandwidth.Given that there exists an exosystem whose state information is not available to all agents,the authors develop distributed adaptive event-triggered observers for the followers based on relative information between neighboring agents.It should be pointed out that,two kinds of time-varying gains are introduced to avoid relying on any global information associated with the network,and dynamic triggering conditions are designed to get rid of continuous communications.On the basis of the designed observers,the authors devise a local controller for each agent.Compared with the existing related works,the main contribution of the current paper is that the cooperative output regulation problem for general directed graphs is solved requiring neither global information nor continuous communications.展开更多
This paper studies the output consensus problem of heterogeneous linear stochastic multiagent systems with multiplicative noises in system parameters and measurements,where the system noise in each agent is allowed to...This paper studies the output consensus problem of heterogeneous linear stochastic multiagent systems with multiplicative noises in system parameters and measurements,where the system noise in each agent is allowed to be different.By employing stochastic output regulation theory and the stochastic Lyapunov function approach,a composite controller embedded with stochastic output regulator equations(SOREs)and a stochastic dynamic compensator is designed to achieve the meansquare output consensus of the multi-agent systems.To implement the consensus algorithm,a sufficient condition for feasible solutions of the SOREs is first established in terms of Lyapunov and Selvester equations.Then the time-varying SOREs are approximated by the Euler-Maruyama method combined with an a-posteriori partial estimation of the increments of the Brownian motion.A numerical example illustrates the theoretical results.展开更多
Recent advances in a power electronic device called an electric spring(ES)provide feasible solutions to meeting critical customers’requirements for voltage quality.A new version of the ES was introduced based on a ba...Recent advances in a power electronic device called an electric spring(ES)provide feasible solutions to meeting critical customers’requirements for voltage quality.A new version of the ES was introduced based on a back-to-back converter(ESBC)configuration which extends the operating range and improves the voltage suppression performance to facilitate ultra-high renewable penetration.This paper proposes an efficient control method to facilitate the voltage regulation function of an ESBC with non-critical loads.Particularly,the proposed method is suitable for various load characteristics.We also develop a consensus algorithm to coordinate multiple ESs for maintaining critical bus voltage in distribution systems with ultra-high renewable penetration.The proposed operation of the ESBC is verified by simulation of a modified IEEE 15-bus distribution network.The results show that the ESBC can effectively regulate system voltage and is superior to the original version of the ES.展开更多
A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model P...A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model Predictive Controller(MPC)design.MPC predicts the future trajectory of the dynamic model by calculating the optimal closed loop feedback gain matrix.In this paper,the optimal closed loop feedback gain matrix was calculated using Kautz function.Being an Orthonormal Basis Function(OBF),Kautz function has an advantage of solving complex pole-based nonlinear system.Genetic Algorithm(GA)was applied to optimally tune the Kautz function-based MPC.A constraint based on phase plane analysis was implemented with the cost function in order to improve the robustness of the Kautz function-based MPC.The proposed method was simulated with three area interconnected power system and the efficiency of the proposed method was measured and exhibited by comparing with conventional Proportional and Integral(PI)controller and Linear Quadratic Regulation(LQR).展开更多
文摘The World Meteorological Organization estimates that about 90 percent of all natural disasters is extreme meteorological hazards like typhoon/hurricane and tropical cyclone triggered disasters. With the increasing tendency of natural hazards, the typhoon induced surge, wave, precipitation, flood and wind as extreme external loads menacing Nuclear Power Plants (NPP) in coastal and inland provinces of China. For all of the planned, designed and constructed NPP in China the National Nuclear Safety Administration of China and IAEA recommended Probable Maximum Hurricane/ Typhoon/(PMH/T), Probable Maximum Storm Surge (PMSS), Probable Maximum Flood (PMF), Design Basis Flood (DBF) as safety regulations recommended for NPP defense infrastructures. This paper discusses the joint probability analysis of simultaneous occurrence typhoon induced extreme external hazards and compared with IAEA 2003-2011 recommended safety regulations for some NPP along China coast to make safety assessment based on the “As Low As Reasonable Practice” (ALARP) principle.
文摘随着可再生能源比例增加,电网新建储能电站成为提升系统频率稳定性的重要手段。针对电网中分布式储能电站(distributedenergystoragestations,DESS)参与一次调频面临的荷电状态均衡问题,提出了一种考虑荷电状态(state of charge,SOC)一致性的DESS协同控制策略。首先,构建了含分布式储能电站的区域电网调频模型,分析了传统调频控制方法的特点,并讨论了储能在高渗透率新能源电网中的调频及一致性控制需求;其次,分析了电网调频需求与DESS的SOC一致性调整需求之间的耦合关系,设计了基于一致性原理的SOC分布式控制策略,进而构建了兼顾两种需求的DESS一次调频协同控制方法,详细分析了关键控制参数的设计原则与取值方法。最后,搭建典型区域电网模型,结合不同频率波动工况进行了仿真验证,结果表明:所提控制策略可以有效改善电网频率质量,在不增加系统调频负担的前提下实现多个储能电站的SOC一致性调节,减小了DESS集群的SOC越限风险,增强了其聚合控制效果。
基金supported in part by the National Natural Science Foundation of China under Grant Nos.61973006 and 62103302Shanghai Sailing Program under Grant No. 21YF1450300+2 种基金Shanghai Municipal Science and Technology Major Project under Grant No. 2021SHZDZX0100Shanghai Municipal Commission of Science and Technology Project under Grant No. 19511132101the Fundamental Research Funds for the Central Universities under Grant No. 22120210523
文摘This paper investigates the cooperative output regulation problem of heterogeneous linear multi-agent systems over directed graphs with the constraint of communication bandwidth.Given that there exists an exosystem whose state information is not available to all agents,the authors develop distributed adaptive event-triggered observers for the followers based on relative information between neighboring agents.It should be pointed out that,two kinds of time-varying gains are introduced to avoid relying on any global information associated with the network,and dynamic triggering conditions are designed to get rid of continuous communications.On the basis of the designed observers,the authors devise a local controller for each agent.Compared with the existing related works,the main contribution of the current paper is that the cooperative output regulation problem for general directed graphs is solved requiring neither global information nor continuous communications.
基金supported by the National Natural Science Foundation of China under Grant Nos.62003104 and 62003103the Guangxi Science and Technology Planning Project under Grant No.AD23026217+2 种基金the Guangxi Natural Science Foundation under Grant No.2022GXNSFBA035649the Interdisciplinary Scientific Research Foundation of Guangxi University under Grant No.2022JCC019the Guangxi University Natural Science and Technological Innovation Development Multiplication Plan Project under Grant No.2023BZRC018。
文摘This paper studies the output consensus problem of heterogeneous linear stochastic multiagent systems with multiplicative noises in system parameters and measurements,where the system noise in each agent is allowed to be different.By employing stochastic output regulation theory and the stochastic Lyapunov function approach,a composite controller embedded with stochastic output regulator equations(SOREs)and a stochastic dynamic compensator is designed to achieve the meansquare output consensus of the multi-agent systems.To implement the consensus algorithm,a sufficient condition for feasible solutions of the SOREs is first established in terms of Lyapunov and Selvester equations.Then the time-varying SOREs are approximated by the Euler-Maruyama method combined with an a-posteriori partial estimation of the increments of the Brownian motion.A numerical example illustrates the theoretical results.
基金fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region under Theme-based Research Scheme through Project No.T23-701/14-N
文摘Recent advances in a power electronic device called an electric spring(ES)provide feasible solutions to meeting critical customers’requirements for voltage quality.A new version of the ES was introduced based on a back-to-back converter(ESBC)configuration which extends the operating range and improves the voltage suppression performance to facilitate ultra-high renewable penetration.This paper proposes an efficient control method to facilitate the voltage regulation function of an ESBC with non-critical loads.Particularly,the proposed method is suitable for various load characteristics.We also develop a consensus algorithm to coordinate multiple ESs for maintaining critical bus voltage in distribution systems with ultra-high renewable penetration.The proposed operation of the ESBC is verified by simulation of a modified IEEE 15-bus distribution network.The results show that the ESBC can effectively regulate system voltage and is superior to the original version of the ES.
文摘A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model Predictive Controller(MPC)design.MPC predicts the future trajectory of the dynamic model by calculating the optimal closed loop feedback gain matrix.In this paper,the optimal closed loop feedback gain matrix was calculated using Kautz function.Being an Orthonormal Basis Function(OBF),Kautz function has an advantage of solving complex pole-based nonlinear system.Genetic Algorithm(GA)was applied to optimally tune the Kautz function-based MPC.A constraint based on phase plane analysis was implemented with the cost function in order to improve the robustness of the Kautz function-based MPC.The proposed method was simulated with three area interconnected power system and the efficiency of the proposed method was measured and exhibited by comparing with conventional Proportional and Integral(PI)controller and Linear Quadratic Regulation(LQR).
