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An improved adaptive backstepping approach on static var compensator controller of nonlinear power systems

INTERNATIONAL JOURNAL OF ADAPTIVE control AND SIGNAL PROCESSING 2018年第5期32卷 700-712页

作者： Su, Qingyu Quan, Wanzhen Cai, Guowei Li, Jian Northeast Elect Power Univ Sch Automat Engn Jilin 132012 Jilin Peoples R China Northeast Elect Power Univ Jilin 132012 Jilin Peoples R China

The transient stability problem of a single-machine infinite-bus system with static var compensator is solved in this paper, where the static var compensator controller is designed by an improved backstepping method combining error compensation, adaptive backstepping control, and sliding mode variable structure control. Crucially, the error compensation term, which chooses in the step of virtual control by the adaptive backstepping method, is introduced to ensure that the system states are bounded, maintaining the nonlinearity of the power systems while also improving the speed of parameter identification. Meanwhile, the Lyapunov function is constituted step by step to achieve stability of the subsystem. In addition, a parameter updating law and a nonlinear control law are explicitly given to asymptotically stabilize the closed-loop system. Finally, a simulation is used to illustrate the effectiveness and the practicality of the proposed control approach.

关键词： adaptive backstepping error compensation single-machine infinite-bus system sliding mode variable structure control static var compensator

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A stability control way of bus voltage in DC microgrid with constant power load

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IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 2021年第9期16卷 1187-1194页

作者： Wang, Lihua Liu, Xiaona Ni, Xue Jiang, Shaojie Liu, Siyuan Shandong Univ Sci & Technol Coll Elect & Informat Engn Qingdao 266590 Peoples R China

During the operation of the independent DC microgrid, the bus voltage will fluctuate with the random changes of the load and source. To maintain the stability of the bus voltage, a control strategy needs to be introduced in the DC microgrid. According to the bus voltage change of DC microgrid, this paper establishes a large-signal mathematical model of DC microgrid with constant power load. Taking the bidirectional DC-DC converter as the control object, a sliding mode variable structure controller based on the washout filter is introduced, and the bus voltage is stabilized at the desired voltage value through the selection of control parameters. The simulation experiment results show that the control strategy proposed in this paper can effectively restrain the fluctuation of the bus voltage under the condition of random changes of the load and source and has strong robustness. (c) 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

关键词： independent DC microgrid constant power load sliding mode variable structure control ro-bustness

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Pulse neural network-based adaptive iterative learning control for uncertain robots

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NEURAL COMPUTING & APPLICATIONS 2013年第7-8期23卷 1885-1890页

作者： He, Xiongxiong Zhuang, Hualiang Zhang, Duan Qin, Zhenhua Zhejiang Univ Technol Coll Informat Engn Hangzhou 310023 Zhejiang Peoples R China

An adaptive iterative learning control algorithm based on pulse neural network (PNN) is proposed for trajectory tracking of uncertain robot system. sliding mode variable structure control is used to improve the robustness to disturbance and perturbation, and boundary layer is used to eliminate the chattering of sliding mode control. In the iterative domain, the unknown parameters are tuned and used for part of the controller. Running in parallel, the PNN can perform real-time state estimation for improving the system convergence. We analyze the stability and convergence of this algorithm by using the Lyapunove-like methodology. The simulation results show that the expected control purpose can be achieved using the proposed algorithm.

关键词： Iterative learning control Pulse neural networks Boundary layer Adaptive control sliding mode variable structure control

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Robust motion control for multi-split transmission line four-wheel driven mobile operation robot in extreme power environment

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INDUSTRIAL ROBOT-THE INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH AND APPLICATION 2020年第2期47卷 219-229页

作者： Li, Hong Jun Jiang, Wei Zou, Dehua Yan, Yu Zhang, An Chen, Wei Wuhan Text Univ Wuhan Peoples R China Hubei Prov Engn Res Ctr Ind Detonator Intelligent Wuhan Peoples R China Hubei Key Lab Digital Text Equipment Wuhan Wuhan Peoples R China Intelligent Live Working Technol & Equipment Robo Changsha Peoples R China State Grid Hunan Transmiss Maintenance Co Changsha Peoples R China State Grid Hunan Elect Power Co Maintenance Co Changsha Peoples R China

Purpose In the multi-splitting transmission lines extreme power environment of ultra-high voltage and strong electromagnetic interference, to improve the trajectory tracking and stability control performance of the robot manipulator when conduct electric power operation, and effectively reduce the influence of disturbance factors on the robot motion control, this paper aims to presents a robust trajectory tracking motion control method for power cable robot manipulators based on sliding mode variable structure control theory. Design/methodology/approach Through the layering of aerial-online-ground robot three-dimensional control architecture, the robot joint motion dynamic model has been built, and the motion control model of the N-degrees of freedom robot system has also been obtained. On this basis, the state space expression of joint motion control under disturbance and uncertainty has been also derived, and the manipulator sliding mode variable structure trajectory tracking control model has also been established. The influence of the perturbation control parameters on the robot motion control can be compensated by the back propagation neural network learning, the stability of the controller has been analyzed by using Lyapunov theory. Findings The robot has been tested on a analog line in the lab, the effectiveness of sliding mode variable structure control is verified by trajectory tracking simulation experiments of different typical signals with different methods. The field operation experiment further verifies the engineering practicability of the control method. At the same time, the control method has the remarkable characteristics of sound versatility, strong adaptability and easy expansion. Originality/value Three-dimensional control architecture of underground-online-aerial robots has been proposed for industrial field applications in the ubiquitous power internet of things environment (UPIOT). Starting from the robot joint motion, the dynamic equation o

关键词： Trajectory tracking Electric power operation robot Robust motion control sliding mode variable structure control

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Improved adaptive backstepping sliding mode control for generator steam valves of non-linear power systems

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IET control THEORY AND APPLICATIONS 2017年第9期11卷 1414-1419页

作者： Su, Qingyu Quan, Wanzhen Cai, Guowei Li, Jian Northeast Elect Power Univ Jilin 132012 Jilin Peoples R China

The stability problem of steam valves in a single machine infinite bus system with thyristor controlled series compensation is addressed through the use of an improved adaptive backstepping method based on error compensation. The method combines sliding mode variable structure control, backstepping control and adaptive control. Initially, an excitation control input and error compensation are simultaneously obtained in the design of virtual control by adaptive backstepping and the Lyapunov method. The Lyapunov function is then constituted in stages to achieve subsystem stability, before obtaining a parameter updating law and a non-linear control law for the closed-loop system. The results for both systems show that the improved non-linear backstepping sliding mode variable structure control approach can have four benefits. It can ensure that the system states are bounded, retain the faster stability of power systems, improve the speed of parameter identification and achieve real-time parameter estimation. Finally, a simulation is presented to illustrate both the effectiveness and the feasibility of the improved control approach.

关键词： steam power stations power generation control adaptive control control nonlinearities variable structure systems nonlinear control systems Lyapunov methods power system stability closed loop systems control system synthesis error compensation thyristor applications electric generators improved adaptive backstepping sliding mode control generator steam valves nonlinear power systems stability problem single machine infinite bus system thyristor controlled series compensation error compensation sliding mode variable structure control excitation control input virtual control design Lyapunov function parameter updating law nonlinear control law closed-loop system improved nonlinear backstepping sliding mode variable structure control approach parameter identification speed real-time parameter estimation

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Research On the Application of Superconducting Magnetic Energy Storage in the Wind Power Generation System For Smoothing Wind Power Fluctuations

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IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 2021年第5期31卷 1-5页

作者： Zhai, Yujia Zhang, Jiawei Tan, Ziwei Liu, Xinyi Shen, Boyang Coombs, Tim Liu, Ping Huang, Shoudao Hunan Univ Elect & Informat Engn Changsha 410082 Peoples R China Univ Cambridge Dept Engn Cambridge CB3 0FA England

As the output power of wind farm is fluctuating, it is one of the important ways to improve the schedule ability of wind power generation to predict the output power of wind farm. The operation mode of tracking planned output takes the planned value issued by the grid dispatching as the control basis of wind power generation. This operation mode is easy to control, which not only meets the needs of power grid dispatching, but also improves the reliability and controllability of new energy generation. This paper introduces the traditional PI control strategy of SMES and combines the advantages of SMES and the characteristics of application scenarios, and introduces sliding mode variable structure control into SMES. Through simulation and comparison of two different control modes, it is verified that SMES adopting sliding mode variable structure control have the advantages of fast response speed and strong robustness, which can make the wind farm output stable power according to the planned value.

关键词： Wind power fluctuations Superconducting Magnetic Energy Storage (SMES) PI control sliding mode variable structure control

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A Novel Cooperative control System of Multi-Missile Formation Under Uncontrollable Speed

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IEEE ACCESS 2021年 9卷 9753-9770页

作者： Zhang, Zhenlin Zhang, Ke Han, Zhiguo Northwestern Polytech Univ Sch Astronaut Xian 710072 Peoples R China

This article investigates a novel cooperative control system based on the sliding mode variable structure control theory for multi-missile formation flight. It is desired in practice to form and maintain the formation under the premise of uncontrollable missile speed. First, under the inertial coordinate system, we obtain the model of the formation control problem using the relative position of the leader to the follower. Then, we perform acceleration conversion and combine it to this model, getting the form of the formation problem model in the ballistic coordinate system. The finished model is useful for researchers to design the formation controller on this basis. Besides, the sliding mode variable structure control theory is used to design the formation controller for the system not considering disturbances and considering disturbances. Then we use the Lyapunov stability theory to analyze the stability of the formation control system. Finally, we compare our method with another method which requires controllable speed. According to numerical simulations, the method proposed in this article can achieve similar relative position errors under the condition of uncontrollable speed. And the robustness, versatility and formation adaptability of the method we propose are confirmed by simulation results.

关键词： Missiles control systems sliding mode control Uncertainty Mathematical model Acceleration control theory Multi-missile formation uncontrollable speed sliding mode variable structure control a leader-follower strategy

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A New Load Torque Identification sliding mode Observer for Permanent Magnet Synchronous Machine Drive System

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2019年第8期34卷 7852-7862页

作者： Lu, Wenqi Zhang, Zhenyi Wang, Dong Lu, Kaiyuan Wu, Di Ji, Kehui Guo, Liang Zhejiang Sci Tech Univ Fac Mech Engn & Automat Hangzhou 310018 Zhejiang Peoples R China Aalborg Univ Dept Energy Technol DK-9220 Aalborg Denmark

Effective identification of the load torque is one of the key aspects in improving the performance of servo drive systems against load disturbances. sliding mode variable structure control has become a popular method in the development of a load torque identification (LTID) algorithm due to its parameter insensitivity and easy realization features. However, existing LTID sliding mode observers (SMO) with conventional structure have the disadvantages of high-frequency chattering and poor estimation accuracy, which limit its application in high-performance servo systems. In this paper, themathematicalmodel of the conventional LTID-SMO is deduced and analyzed. A new LTID-SMO is proposed by replacing the sign function with a saturation function and an additional feedback loop in the load torque observer. The effectiveness of the proposed observer is verified by various experiments. The results show that compared to conventional load torque observer, the proposed observer can identify the load torque with higher accuracy and faster response in different operational conditions.

关键词： Chattering load torque identification (LTID) robustness sliding mode observer (SMO) sliding mode variable structure control

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The research of digital-PID and sliding mode control strategy for DC/DC converter

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INTERNATIONAL JOURNAL OF modeLLING IDENTIFICATION AND control 2016年第3期26卷 273-282页

作者： Zhou, Qi Zhou, Chu Yang, Bing Qu, Shaocheng Cent China Normal Univ Elect & Informat Engn Dept Wuhan 430079 Hubei Province Peoples R China

Based on the fixed frequency PWM control strategy, this paper introduces a DSP-based digital PID control technology and a sliding mode variable structure control theory for high frequency DC/DC converter in detail. Firstly, a traditional analogy sliding mode controller with the reaching law and a digital PID controller are designed, respectively. Then, experimental prototypes for two kinds of control systems for DC/DC converters are constructed, and comparative experiment are implemented. The experiment results show that the DC/DC converter by using digital PID controller has a fast dynamic response and high accuracy in the presence of the input voltage fluctuation and load variation.

关键词： pulse width modulation PWM digital PID control sliding mode variable structure control DC/DC

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sliding mode MPPT controller for Photovoltaic Systems Under Partial Shading Conditions

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JOURNAL OF ADVANCED COMPUTATIONAL INTELLIGENCE AND INTELLIGENT INFORMATICS 2016年第7期20卷 1112-1118页

作者： Ding, Min Tang, Yi Cao, Weihua Tan, Zhili Wang, Qingyi Li, Danyun China Univ Geosci Sch Automat 388 Lumo Rd Wuhan 430074 Hubei Peoples R China Cent S Univ Sch Informat Sci & Engn 932 South Lushan Rd Changsha 410083 Hunan Peoples R China

This study focuses on maximum power point tracking (MPPT) control for photovoltaic (PV) power generation systems under partial shading conditions. A mathematic model of the partially shaded solar cell is built. Then, the output characteristics of the partial-shade array are analyzed. Based on the model of the PV battery and the concept of the average-state switch cycle, an average-state mathematical model of the PV power generation system using a boost circuit for the realization circuit is established. A sliding mode controller based on the integral sliding mode function is designed to realize MPPT in the PV power generation system. Finally, simulations in MATLAB/Simulink confirm the functionality and performance of the proposed controller.

关键词： photovoltaic partial shading maximum power point tracking boost sliding mode variable structure control

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