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PMSG Wind turbine grid-connected pre-synchronization technology based on virtual impedance 3

PMSG Wind turbine grid-connected pre-synchronization technol...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Meng, Zi Shu Lu, Yong Geng Shanghai Dianji University Power Systems and Their Automation Systems Pudong new area Shanghai China Shanghai Dianji University Power Systems and Their Automation Systems Pudong new area Shanghai China

With the integration of large-scale wind power, the inertia of the whole grid system is reduced. Therefore, virtual synchronous machine (VSG) technology has become a new strategy for wind power integration. In view of the fact that the VSG grid connected control of permanent magnet direct drive wind turbine does not consider the constraints of grid connection conditions, a scheme combining VSG technology with pre synchronization technology is proposed in this paper. VSG technology is still used in the PWM control of grid connected inverter. However, considering that there is no deviation between the phase angle of output voltage and the phase angle of grid voltage, it is impossible to judge whether the grid connection conditions are met or not when there is no deviation between the phase angle of output voltage and that of grid voltage. © Published under licence by IOP Publishing Ltd.

关键词： Permanent magnets

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Adaptive climbing motion of snake robot based on joint decoupling and extended Kalman filter 3

Adaptive climbing motion of snake robot based on joint decou...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Xiao, Wenyu Gao, Yong Wei, Wu Zhang, Jie Tan, Xiaoman School of Automation Science and Engineering South China University of Technology Guangzhou Guangdong China Guangdong Machinery Research Institute Company Guangzhou Guangdong China

This paper proposes a decoupled gait control function to solve the adaptive transition problem of the snake robot climbing the rod with variable diameter. Firstly, the Sigmoid function is combined with the general gait control function to achieve the decoupling control of the robot joints. Then an adaptive adjustment algorithm of key control parameters is designed based on the extended Kalman filter (EKF) to realize the decoupling gait changes continuously and compliantly as the environment changes. Finally, the physical meanings of the key control parameters are reiterated by simulation, and their influence on the decoupling of climbing gait is analyzed. The smooth transition climbing experiments of the snake robot on rods with different diameters verify the effectiveness of the decoupling and adaptive algorithm. © Published under licence by IOP Publishing Ltd.

关键词： Extended Kalman filters

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Sensorless control of SMPMSM drive system integrated the differential algebra with the algebraic parameter identification 3

Sensorless control of SMPMSM drive system integrated the dif...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Xu, Ben Li, Hongmei Yang, Liguo Wang, Xianling Wang, Jinyu Department of Electrical Engineering and Automation Hefei University of Technology Hefei Anhui230009 China

The differential algebraic sensorless control has the technical features of clear concept and low calculation amount. However, this method is particularly sensitive to motor parameters. Therefore, a differential algebraic sensorless control strategy combined with algebraic parameter identification is proposed and applied to surface mounted permanent magnet synchronous motor (SMPMSM) drive system in this paper. Without the signal injection, the proposed method can promptly and accurately realize the online simultaneous identification of stator resistance and inductance based on the different torque conditions of system, and then the motor parameters used in the differential algebraic sensorless control are updated in time. In addition, the tracking differentiator is designed to accurately obtain the first-order differential of the stator current signal with noises for rotor position estimation. Finally, the effectiveness of the proposed sensorless control method is validated by the simulation results. © Published under licence by IOP Publishing Ltd.

关键词： Stators

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Design of Nonlinear Excitation controller for Generator Based on Differential Algebra 3

Design of Nonlinear Excitation Controller for Generator Base...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Wang, Zhongyong Xu, Yingjing School of Automation Guangdong University of Petrochemical Technology Maoming City Guangdong Province5252000 China Academic Affairs Office Guangdong University of Petrochemical Technology Maoming City Guangdong Province5252000 China

With the appropriate transformation to the system model, this paper proposed the nonlinear control strategy for differential algebraic system based on the linear control law. Applying the method to single machine infinite-bus power system, which belongs to a nonlinear differential algebraic model, a nonlinear excitation control law has been designed. Simulation results show that the control law can enhance the stability of the system, also it can improve the regulative precision of generator terminal voltage, make each state trace for their given values rapidly. It manifests that the proposed method can effectively solve the design problem for nonlinear differential algebraic system and it is valuable for application. © Published under licence by IOP Publishing Ltd.

关键词： System stability

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Using variational regularization method of electrical impedance tomography to reduce the position error of human arm 3

Using variational regularization method of electrical impeda...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Du, Donghai Huang, Kun Liu, Xingmou Li, Qingdu Zhang, Jiajia College of Automation Chongqing University of Posts and Telecommunications Chongqing400065 China

This paper investigates how to reconstruct human arm images using electrical impedance tomography. A simplified arm model is first established. The comparison between the Tikhonov regularized reconstruction algorithm and the Variation regularized reconstruction algorithm is then made. The results show that the Variation regularized reconstruction algorithm has the lesser position error on the organizational junction edges and is basically overlap with the target area of the model. How to eliminate the artefact of the reconstructed image needs to be further investigated. © Published under licence by IOP Publishing Ltd.

关键词： Electric impedance tomography

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Research on Fault Diagnosis of Steam Turbine Based on Bayesian Network 3

Research on Fault Diagnosis of Steam Turbine Based on Bayesi...

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2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Zhang, Dongliang Wang, Liufeng Hong, Qinqin Zhang, Kaiwen College of Automation Engineering Shanghai University of Electric Power Shanghai China Shanghai Key Laboratory of Power Station Automation Technology China

In the fault diagnosis of steam turbine, multiple faults contain number of uncertainties due to the complexity of fault diagnosis knowledge and the strong correlation and coupling between different faults and massive prior knowledge is needed. In this paper, a fault diagnosis method of steam turbine based on Bayesian network is proposed. Various faults and symptoms are parameterized using Bayesian network nodes. Then rough set theory is used to simplify the complex causal relationship between faults and symptoms, and Noisy-Or model is used to simplify the conditional probability parameters. A diagnostic model of the steam turbine was developed using a simplified Bayesian network. The experiment results are shown to validate the practicality and effectiveness of the proposed designs. © Published under licence by IOP Publishing Ltd.

关键词： Bayesian networks

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Model design and gait planning of hexapod climbing robot 3

Model design and gait planning of hexapod climbing robot

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Cai, Zhongbin Gao, Yong Wei, Wu Gao, Tianxiao Xie, Zhijian School of Automation Science and Engineering South China University of Technology Guangzhou Guangdong China Electric Automation Department Guangzhou Electromechanical Technician College Guangzhou Guangdong China

In this paper, we design a hexapod climbing robot and propose a cross-plane transition gait algorithm to solve the problem that the general walking robot can't perform the work at high altitude and can't realize the autonomous transition between multiple planes. Firstly, we build a simulation control system based on MATLAB and V-REP for algorithm analysis and motion verification. Meanwhile, virtual connection technology is used to design virtual suction sensor to simulate the real adhesion mechanisms. Then, the single-plane walking gait algorithm is designed based on the SS-Shaped interpolation function, which effectively avoid the wear of the adhesion mechanisms. The transition algorithm based on workspace constraints is designed to greatly improve the adaptability of robots in complex environments. Finally, the simulation of rhythmic gait motion and ground-slope transitional motion verify the effectiveness of the gait planning method. © Published under licence by IOP Publishing Ltd.

关键词： MATLAB

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Improved fast three vector predictive current control of permanent magnet synchronous motor 3

Improved fast three vector predictive current control of per...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Fang, Zhiyuan Luo, Chen Sun, Sifan Automation Chongqing University of Posts and Telecommunications Chongqing400065 China

In order to improve the steady-state performance of the traditional model predictive control and reduce the amount of calculation of the control algorithm, this paper proposes a new fast three-vector predictive current control algorithm, which uses the principle of deadbeat control of the dq-axis current to calculate the reference voltage vector, and obtains the reference voltage vector position through sector judgment, combined with the three-vector model predictive control algorithm, the optimal voltage vector is directly applied to the motor, without the need to predict the behavior of the system under the voltage vector, which greatly reduces the amount of calculation. At the same time, due to the introduction of three vectors, three functions are applied in one cycle. The voltage vector greatly improves the steady-state characteristics of the system. The simulation results show that the proposed new three-vector predictive current control algorithm can reduce the amount of calculation and improve the steady-state characteristics of the system. © Published under licence by IOP Publishing Ltd.

关键词： Vectors

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Adaptive predictive control of average coolant temperature based on chaotic particle swarm optimization 3

Adaptive predictive control of average coolant temperature b...

引用

2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Zhang, Long College of Automation Engineering Shanghai University of Electric Power Shanghai200090 China

Aiming at the problem that the average temperature control system of nuclear reactor coolant under variable conditions is nonlinear and time-varying, and the traditional fixed model cannot meet the control requirements, an improved generalized predictive control method with adaptive identification of model parameters is proposed. First, the structure of the coolant average temperature model is determined through mechanism derivation, and the forgetting factor recursive least square algorithm is used to identify the model parameters online and in real time. Secondly, the chaotic particle swarm algorithm is used to optimize the control increment during rolling optimization. The simulation is carried out on the MATLAB platform, and the results show that the tracking ability of the average coolant temperature is significantly better than the traditional PI control under variable conditions. © Published under licence by IOP Publishing Ltd.

关键词： Coolants

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Multi-timescale Distributed Model Predictive control for Large-Scale Systems and a Case Study 3

Multi-timescale Distributed Model Predictive Control for Lar...

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2020 3rd international Symposium on Power Electronics and control engineering, ISPECE 2020

作者： Zhao, Xiaoming Zhang, Wenli Zhang, Weidong Zhang, Wenzhao Department of Technology Gansu Sixth Construction Group Limited Company Lanzhou City Gansu Province730050 China Department of Automation Lanzhou University of Technology Lanzhou City Gansu Province730050 China

To solve the control problem effectively of complicated large scale system with obvious difference in the dynamic response at each channel, a strategy based on multi-timescale and distributed communication mode is presented. These systems can be regarded as combinations of fast system and slow system, the response speeds of which are in two-time scale. The algorithm takes into account the fast and slow characteristics and the coupling relationship of each subsystem, uses the Nash optimal idea and the multi-time standard information prediction method to realize the optimization control of the whole system. A simulation example is given to illustrate the effectiveness. © Published under licence by IOP Publishing Ltd.

关键词： Large scale systems

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