An adaptive controller involving a neural network(NN)compensator is proposed to resist the uncertainties in the Euler-Lagrangian system(ELS).Firstly,a proportional-differential(PD)control law is designed for the nomin...An adaptive controller involving a neural network(NN)compensator is proposed to resist the uncertainties in the Euler-Lagrangian system(ELS).Firstly,a proportional-differential(PD)control law is designed for the nominal model.Meanwhile,the uncertainties including model error and external disturbance are separated from the closed-loop system.Then,an adaptive NN compensator based on the online training mode is proposed to eliminate the adverse effect of the uncertainties.In addition,the stability of the closed-loop system is proved by Lyapunov theory.Finally,the effectiveness of the proposed approach is verified on a two-degree-of-freedom robot manipulator.展开更多
随着“双碳”目标的提出,我国的新能源建设正处于新一轮的发展阶段,但是高渗透率新能源的随机性、波动性也给电力系统静态电压稳定性分析带来了挑战。与此同时,电力电子技术的发展使得柔性交流输电系统(flexible AC transmission system...随着“双碳”目标的提出,我国的新能源建设正处于新一轮的发展阶段,但是高渗透率新能源的随机性、波动性也给电力系统静态电压稳定性分析带来了挑战。与此同时,电力电子技术的发展使得柔性交流输电系统(flexible AC transmission system,FACTS)在调节线路潮流、改善电力系统静态电压稳定性方面得到广泛应用。提出了一种考虑新能源不确定性的含分布式静止同步串联补偿器(distributed static series compensator,DSSC)的电力系统静态电压稳定性概率评估方法。首先分析了新能源并网系统的静态电压稳定机理。然后阐述了DSSC的工作原理,建立了DSSC的等效功率注入模型,并基于此模型推导出含DSSC的潮流方程。其次基于潮流计算方程提出了一种能映射新能源不确定性的静态电压稳定性指标,并采用蒙特卡洛模拟法实现了系统静态电压稳定性指标概率评估。最后通过算例分析验证了高渗透率新能源的不确定性导致系统静态电压稳定指标分布范围变大,系统失稳概率增加,合理配置DSSC能够有效提升电力系统静态电压稳定性,所提方法能够准确反映新能源不确定性对电网稳定性的影响,具有一定的工程应用价值。展开更多
An active disturbance rejection controller （ADRC） is developed for load frequency control （LFC） and voltage regulation respectively in a power system. For LFC, the ADRC is constructed on a three-area interconnecte...An active disturbance rejection controller （ADRC） is developed for load frequency control （LFC） and voltage regulation respectively in a power system. For LFC, the ADRC is constructed on a three-area interconnected power system. The control goal is to maintain the frequency at nominal value （60Hz in North America） and keep tie-line power flow at scheduled value. For voltage regulation, the ADRC is applied to a static var compensator （SVC） as a supplementary controller. It is utilized to maintain the voltages at nearby buses within the ANSI C84.1 limits （or ＋5% tolerance）. Particularly, an alternative ADRC with smaller controller gains than classic ADRC is originally designed on the SVC system. From power generation and transmission to its distribution, both voltage and frequency regulating systems are subject to large and small disturbances caused by sudden load changes, transmission faults, and equipment loss/malfunction etc. The simulation results and theoretical analyses demonstrate the effectiveness of the ADRCs in compensating the disturbances and achieving the control goals.展开更多
基金Shanghai Rising-Star Program,China (No.19QA1400400)Natural Science Foundation of Shanghai,China (No.21ZR1401100)+1 种基金Fundamental Research Funds for the Central Universities,China (No.2232019G-09)Graduate Student Innovation Fund of Donghua University,China (No.CUSF-DH-D-2021052)。
文摘An adaptive controller involving a neural network(NN)compensator is proposed to resist the uncertainties in the Euler-Lagrangian system(ELS).Firstly,a proportional-differential(PD)control law is designed for the nominal model.Meanwhile,the uncertainties including model error and external disturbance are separated from the closed-loop system.Then,an adaptive NN compensator based on the online training mode is proposed to eliminate the adverse effect of the uncertainties.In addition,the stability of the closed-loop system is proved by Lyapunov theory.Finally,the effectiveness of the proposed approach is verified on a two-degree-of-freedom robot manipulator.
文摘随着“双碳”目标的提出,我国的新能源建设正处于新一轮的发展阶段,但是高渗透率新能源的随机性、波动性也给电力系统静态电压稳定性分析带来了挑战。与此同时,电力电子技术的发展使得柔性交流输电系统(flexible AC transmission system,FACTS)在调节线路潮流、改善电力系统静态电压稳定性方面得到广泛应用。提出了一种考虑新能源不确定性的含分布式静止同步串联补偿器(distributed static series compensator,DSSC)的电力系统静态电压稳定性概率评估方法。首先分析了新能源并网系统的静态电压稳定机理。然后阐述了DSSC的工作原理,建立了DSSC的等效功率注入模型,并基于此模型推导出含DSSC的潮流方程。其次基于潮流计算方程提出了一种能映射新能源不确定性的静态电压稳定性指标,并采用蒙特卡洛模拟法实现了系统静态电压稳定性指标概率评估。最后通过算例分析验证了高渗透率新能源的不确定性导致系统静态电压稳定指标分布范围变大,系统失稳概率增加,合理配置DSSC能够有效提升电力系统静态电压稳定性,所提方法能够准确反映新能源不确定性对电网稳定性的影响,具有一定的工程应用价值。
文摘An active disturbance rejection controller （ADRC） is developed for load frequency control （LFC） and voltage regulation respectively in a power system. For LFC, the ADRC is constructed on a three-area interconnected power system. The control goal is to maintain the frequency at nominal value （60Hz in North America） and keep tie-line power flow at scheduled value. For voltage regulation, the ADRC is applied to a static var compensator （SVC） as a supplementary controller. It is utilized to maintain the voltages at nearby buses within the ANSI C84.1 limits （or ＋5% tolerance）. Particularly, an alternative ADRC with smaller controller gains than classic ADRC is originally designed on the SVC system. From power generation and transmission to its distribution, both voltage and frequency regulating systems are subject to large and small disturbances caused by sudden load changes, transmission faults, and equipment loss/malfunction etc. The simulation results and theoretical analyses demonstrate the effectiveness of the ADRCs in compensating the disturbances and achieving the control goals.
