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Event-triggered based decentralised control for frequency regulation of power systems

IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第10期14卷 2004-2015页

作者： Dahiya, Pankaj Mukhija, Pankaj Saxena, Anmol Ratna Natl Inst Technol Delhi Dept Elect & Elect Engn Delhi India

The present work focuses on the design of optimal proportional-integral-derivative with filter controller for the frequency regulation in single and multi-area thermal power systems considering effective utilisation of the network resources. The proposed strategy uses global neighbourhood algorithm (GNA), a meta-heuristic algorithm, to obtain optimal controller parameters. Since the controller, in load frequency control (LFC) systems, communicates via open channels there is a need for effective utilisation of channel bandwidth. Therefore, for effective communication, the decentralised adaptive periodic event-triggered scheme is adopted in this study. In order to find the appropriate values of sampling time and to study the effects of time-delay introduced by the communication channel, delay-dependent stability is investigated using Lyapunov theory. The theoretical concepts, developed in this study, are verified using the time-domain simulations carried out using MATLAB which validates the superiority of the GNA-based approach for LFC systems.

关键词： power generation control three-term control Lyapunov methods thermal power stations delays optimal control decentralised control control system synthesis frequency control power system stability adaptive control periodic control load flow control frequency regulation optimal proportional-integral-derivative filter controller multiarea thermal power systems network resources global neighbourhood algorithm meta-heuristic algorithm optimal controller parameters load frequency control systems open channels channel bandwidth decentralised adaptive periodic event-triggered scheme sampling time time-delay communication channel delay-dependent stability GNA-based approach LFC systems event-triggered based decentralised control Lyapunov theory

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Active contours driven by novel fitting term for image segmentation

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ELECTRONICS LETTERS 2017年第13期53卷 854-855页

作者： Ni, Kang Wu, Yiquan Nanjing Univ Aeronaut & Astronaut Sch Elect & Informat Engn Nanjing Jiangsu Peoples R China

Active contour model driven by novel fitting term is proposed for image segmentation in this letter. The novel fitting term contains two parts: one is L1 fitting term, which describes the change of energy between inside and outside the curve;another is the reciprocal crossentropy fitting term, which can compute the local energy of every point on the curve. The reciprocal cross- entropy fitting term is more robust than L1 fitting term when the regional grey scale fluctuates greatly, and the detail direction of the curve can be controlled better by it. Experiments on several synthetic and real images have shown that the proposed model achieves better segmentation results and efficiency than the other models;in addition, it is insensitive to different initial contours.

关键词： delay circuits phase shifters controllers optimal control time-domain analysis phase control Bode diagrams transient response time delay optimal controller parameters pole placement requirements time-domain performance index direct control trial-and-error phase-lead design techniques crossover frequency phase shift Bode diagrams root locus industrial applications phase-lead controllers transient response pole-zero ratio minimisation approach pole placement analytical phase-lead controller design

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Improved droop control based on virtual impedance and virtual power source in low-voltage microgrid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2017年第4期11卷 1046-1054页

作者： Dou, Chunxia Zhang, Zhanqiang Yue, Dong Song, Mengmeng Yanshan Univ Inst Elect Engn Qinhuangdao 066004 Peoples R China Nanjing Univ Posts & Telecommun Inst Adv Technol Nanjing 210023 Jiangsu Peoples R China

Droop control is a common method in the universal microgrid applications. Conventional droop control is unpractical for low-voltage microgrid, where the line impedance among distributed generation units (DGs) is mainly resistive to generate the active and reactive power of DG is coupled. Besides, accurate reactive power sharing is not achieved due to the voltage deviation of DGs caused by disparate line impedance in microgrid. An improved droop control based on the virtual power source (VPS) and composite virtual impedance, which is constituted by a negative resistance and a negative inductance, is proposed for low-voltage microgrid. The virtual negative resistance counteracts the line resistance to decouple power. The reactive power sharing accuracy based on the virtual negative inductance and VPSs control increases through analysing the line and virtual voltage drop. Finally, the fractional-order PID controller is adopted to control the inverter voltage. The optimal controller parameters are obtained by the differential evolution algorithm. To verify the viability and availability of improved control strategy, simulations are carried out on MATLAB/Simulink.

关键词： distributed power generation power generation control reactive power control three-term control controllers invertors droop control virtual impedance virtual power source low-voltage microgrid universal microgrid among distributed generation units active power reactive power sharing fractional-order PID controller inverter voltage optimal controller parameters MATLAB Simulink

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Multi-loop PI/PID controllers design for disturbance rejection based on non-parametric effective model and non-convex optimisation

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IET CONTROL THEORY AND APPLICATIONS 2014年第15期8卷 1499-1512页

作者： Jin, Qibing Liu, Qie Beijing Univ Chem Technol Coll Informat Sci & Technol Inst Automat Beijing 100029 Peoples R China

In this study, the authors address the design of the multi-loop controllers for multi-input and multi-output (MIMO) processes for disturbance rejection. Three types of disturbance rejection are analysed, and they demonstrate that those disturbance responses are directly related to the integral terms of the controllers. A concept of non-parametric effective model is introduced here to decompose a MIMO control system into several equivalent single-input and single-output control systems. Based on the effective model in each loop, a non-convex optimisation problem is established to obtain the optimal controller parameters with certain robustness indices. Considering the drawbacks of using random search algorithm, they develop a numerical algorithm to solve this non-convex optimisation problem. Simulation studies demonstrate that the proposed method improves the disturbance rejection compared with other decentralised controllers.

关键词： MIMO systems three-term control PI control control system synthesis concave programming optimal control search problems numerical analysis multiloop PI-PID controllers design disturbance rejection nonparametric effective model multi-input and multi-output processes disturbance responses MIMO control system nonconvex optimisation problem equivalent single-input and single-output control systems optimal controller parameters certain robustness indices random search algorithm numerical algorithm decentralised controllers

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PV System Modeling and a Global-Planning Design for Its controller parameters

PV System Modeling and a Global-Planning Design for Its Cont...

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29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

作者： Xie, Yifeng Huang, Jingyu Liu, Xiaokang Zhuo, Fang Liu, Baoquan Zhang, Hailong Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Peoples R China Xuji Grp Xuchang Peoples R China

ISBN: (纸本)9781479923250

The conventional mathematic model of PV (Photovoltaic) cells contains logarithmic terms, which is not conducive to derivation calculation in small-signal modeling. The parameters of PV system are coupling due to its double-loop control method, and it's hard to precisely choose controller parameters. To solve these two problems above, this paper is based on PV system connected to an infinite power grid, uses the linear-fitting model of PV cells which is conducive to derivation instead of the original engineering one in small-signal modeling, and analyses the small-signal stability of the entire system. Meanwhile, a global-planning design for controller parameters is proposed to globally provide the optimal controller parameters. Simulation results show that the linear-fitting model of PV cells is very similar to the original engineering one, and the proposed design for controller parameters can provide a solution to calculate the global optimization.

关键词： mathematical analysis optimal control power generation control power generation planning solar cells PV cells PV system modeling PV system parameters controller parameters double-loop control method global optimization global-planning design linear-fitting model mathematic model optimal controller parameters photovoltaic cells power grid Analytical models Eigenvalues and eigenfunctions Equations Inverters Mathematical model Power system stability Stability analysis

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