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Analysis of Harmonics Detection and their Filtration by using Active Band Pass Filter for Domestic Appliances

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Analysis of Harmonics Detection and their Filtration by usin...

IEEE International Conference on automation Science and engineering (CASE)

作者： Ehtisham Lodhi Zeeshan Lodhi Zhu Fenghua Gang Xiong Feiyue Wang Waheed ur Rehman Tariku Sinshaw The SKL for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad Campus Pakistan Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan Guangdong China Beijing Engineering Research Center of Intellectual System and Technology Chinese Academy of Sciences Beijing China College of Mechanical Engineering and Applied Electronics Technologies Beijing University of Technology Beijing China

ISBN: (数字)9781728169040

ISBN: (纸本)9781728169057

In modern era, one of the rising power quality (PQ) concern is harmonics distortion (HD). The HD is usually produced by increase in the utilization of nonlinear user loads at domestic level. It not only spoils the PQ but also have harmful effects on electrical appliances. So, this paper presents a new approach to mitigate the HD in home appliances rapidly by utilizing the active band pass filter (ABPF). The fast Fourier transform (FFT) technique is employed for the detection of harmonics in appliances. The band pass filter dramatically affects the response time of active filter. The suggested control methodology is capable to eliminate harmonics from distorted input voltage waveform and provides a pure sinusoidal waveform. The prototype of this model is also implemented. Experimental results along with simulation show that the proposed model is quite effective in eliminating HD despite load variations and also useful to compensate the reactive power in electronic home appliances. Hence, this technique is cost effective for domestic users with high quality performance in all aspects.

关键词： Power harmonic filters Harmonic analysis Band-pass filters Harmonic distortion Home appliances

Quantum hamiltonian identification with classical colored measurement noise

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arXiv 2019年

作者： Tan, Lingyu Dong, Daoyi Li, Dewei Xue, Shibei Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China School of Engineering and Information Technology University of New South Wales CanberraACT2600 Australia

In this paper, we present a Hamiltonian identification method for a closed quantum system whose time trace observables are measured with colored measurement noise. The dynamics of the quantum system are described by a Liouville equation which can be converted to a coherence vector representation. Since the measurement process is disturbed by classical colored noise, we introduce an augmented system model to describe the total dynamics, where the classical colored noise is parameterized. Based on the augmented system model as well as the measurement data, we can find a realization of the quantum system with unknown parameters by employing an Eigenstate Realization Algorithm. The unknown parameters can be identified using a transfer-function-based technique. An example of a two-qubit system with colored measurement noise is demonstrated to verify the effectiveness of our method. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum optics

Research on a New Hysteresis control Technology for Flexible High-voltage Direct Current Transmission

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Research on a New Hysteresis Control Technology for Flexible...

2018 3rd International Conference on Computer Science and Information engineering(ICCSIE 2018)

作者： Dian Zhang Qingliang Qin Bo Wang College of Automation & Electronic Engineering Qingdao University of Science & Technology Engineering Department China National Automation Control System Corp.

The nearest level approximation control algorithm(nlm) is employed for multi-level multi-module(mmc) in the flexible high-voltage direct current(hdvc) *** decimal part of this algorithm needs to input sine digital pulse width modulator(dpwm),however,since the dpwmis too sensitive and less stable,the output digital pulse becomes too narrow and the digital signal frequency changes too *** order to solve the multilevel problems of the inverter frequency operation,the hysteretic Schmidt comparison method is proposed to meet the requirement of *** method can not only ensure the stability of the output digital signal,but also can adjust the hysteretic Schmidt trigger threshold,obtain more ideal digital pulse width which reduces the digital signal output frequency and make digital output signals stable and the pulse width,the grading sorting algorithm and guarantee the reduction of the output control pulse *** feasibility of the method is verified through simulation and the actual running results of this method in field-programmable gate array(fpga) show that the study of nlm control algorithm can optimize the flexible hvdc control requirements.

关键词： high-voltage direct current hysteresis control triangular carrier wave

Feedback control of a non-Markovian single qubit system 11

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Feedback control of a non-Markovian single qubit system

2017 11th Asian control Conference, ASCC 2017

作者： Xue, Shibei Nguyen, Thien Petersen, Ian R. Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Research School of Engineering Australian National University CanberraACT2600 Australia

ISBN: (纸本)9781509015733

In this paper, we utilize a feedback strategy to stabilize a single qubit in a non-Markovian environment with a Lorentzian spectrum. The non-Markovian single qubit is represented in an augmented system model, where an ancillary system is introduced as the internal mode of the environment to generate Lorentzian noise. The density matrix of the single qubit can be estimated by using an augmented-system-based quantum stochastic master equation. Then a feedback controller can be driven by the estimates to stabilize the qubit in a target state. Simulations show the feedback strategy can provide effective control of the non-Markovian single qubit. © 2017 IEEE.

关键词： Feedback control

Contraction analysis on primal-dual gradient optimization

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arXiv 2019年

作者： Su, Yanxu Shi, Yang Sun, Changyin School of Automation Southeast University Nanjing210096 China Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of Education Southeast University Nanjing210096 China Department of Mechanical Engineering University of Victoria VictoriaBCV8W 3P6 Canada

This paper analyzes the contraction of the primaldual gradient optimization via contraction theory in the context of discrete-time updating dynamics. The contraction theory based on Riemannian manifolds is first established for convergence analysis of a convex optimization algorithm. The equality and inequality constrained optimization cases are studied, respectively. Under some reasonable assumptions, we construct the Riemannian metric to characterize a contraction region. It is shown that if the step-sizes of the updating dynamics are properly designed, the convergence rates for both cases can be obtained according to the contraction region in which the convergence can be ***, the augmented Lagrangian function which is projection free is adopted to tackle the inequality constraints. Some numerical experiments are simulated to demonstrate the effectiveness of the presented contraction analysis results on primal-dual gradient optimization algorithm. Copyright © 2019, The Authors. All rights reserved.

关键词： Convex optimization

Distributed model predictive control under inexact primal-dual gradient optimization based on contraction analysis

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arXiv 2019年

This paper develops a distributed model predictive control (DMPC) strategy for a class of discrete-time linear systems with consideration of globally coupled constraints. The DMPC under study is based on the dual problem concerning all subsystems, which is solved by means of the primal-dual gradient optimization in a distributed manner using Laplacian consensus. To reduce the computational burden, the constraint tightening method is utilized to provide a capability of premature termination with guaranteeing the convergence of the DMPC optimization. The contraction theory is first adopted in the convergence analysis of the primal-dual gradient optimization under discrete-time updating dynamics towards a nonlinear objective function. Under some reasonable assumptions, the recursive feasibility and stability of the closed-loop system can be established under the inexact solution. A numerical simulation is given to verify the performance of the proposed strategy. Copyright © 2019, The Authors. All rights reserved.

关键词： Closed loop systems

Transient stability of the grid integrated with wind turbines during fault condition 7

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Transient stability of the grid integrated with wind turbine...

7th Brazilian Electrical systems Symposium, SBSE 2018

作者： Marcillo, Kevin Eduardo Lucas Barra, Hugo Menezes Barra, Walter Rocha, Erick Melo Nunes, Marcus Vinicius Alves Federal University of Pará Department of Electrical Engineering Automation Laboratory Belém PA66075110 Brazil Federal University of Pará Department of Electrical Engineering Power System Control Laboratory Belém PA66075110 Brazil Federal University of Pará Department of Electrical Engineering High Voltage Laboratory Belém PA66075110 Brazil

ISBN: (纸本)9781538633632

In this paper, a computational study is carried out in order to assess the impacts of the wind power generation on dynamic behavior in the power system concerned by a modelling simulation. The concepts of different types of wind turbine generators (WTGs) and the principles of the grid-connected structures of wind power generation systems are first briefly introduced. The Electrical Network used for the investigations comes from the IEEE. A change was made to include the Wind Power system with Wind Power Generators in Bar 2, as described later. As a comparison, the paper reports the results of several tests by using different WTG technologies, evaluating the corresponding performance under the occurrence of the same kind of fault. © 2018 IEEE.

关键词： Wind Turbine Generators

A gradient algorithm for Hamiltonian identification of open quantum systems

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arXiv 2019年

作者： Xue, Shibei Wu, Rebing Li, Dewei Jiang, Min Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Department of Automation Tsinghua University Beijing100084 China Center for Quantum Information Science and Technology BNRist Beijing100084 China School of Electronics and Information Engineering Soochow University Suzhou215006 China

In this paper, we present a gradient algorithm for identifying unknown parameters in an open quantum system from the measurements of time traces of local observables. The open system dynamics is described by a general Markovian master equation based on which the Hamiltonian identification problem can be formulated as minimizing the distance between the real time traces of the observables and those predicted by the master equation. The unknown parameters can then be learned with a gradient descent algorithm from the measurement data. We verify the effectiveness of our algorithm in a circuit QED system described by a Jaynes-Cumming model whose Hamiltonian identification has been rarely considered. We also show that our gradient algorithm can learn the spectrum of a non-Markovian environment based on an augmented system model. Copyright © 2019, The Authors. All rights reserved.

关键词： Hamiltonians

The NRSF-SVM based method for nonlinear rotor bearing fault diagnosis

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The NRSF-SVM based method for nonlinear rotor bearing fault ...

第30届中国控制与决策会议

作者： Ying Ma Zhong Luo Haopeng Liu Yunpeng Zhu School of Mechanical Engineering & Automation Northeastern University Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern University Department of Automatic Control and System Engineering University of Sheffield

The fault diagnosis scheme of the rotor bearing system often conducted by using either signal analysis approach or modeling method. In practice, the structure of the rotor bearing system is complex and contains many nonlinear factors. Therefore, it is hard to use the model-based method for fault detection. Thus, signal analysis approach is more efficient. In the signal analysis approach, frequency response function is widely applied. However, the existing analyzing methods of frequency response function have some limitations, such as multidimensional property. Thus, in this study, the concept of Nonlinear Response Spectrum Function(NRSF) is proposed to solve the problem. Finally, a simulation is conducted to identify the multi-fault rotor bearing systems by the proposed NRSFs feature and Support Vector Machine(SVM) classifier, showing that the NRSF-SVM approach has an excellent performance in fault identification of rotor bearing system.

关键词： rotor bearing system fault diagnosis NRSF SVM