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Sun Q.,University of Science and Technology Beijing | Sun Q.,Key Laboratory of Advanced Control of Iron and Steel Process | Wang Y.,Beijing University of Posts and Telecommunications
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2012

In order to overcome the disadvantages of non-minimum phase system, which the Z-source inverter has when it is used in the motor drive system of electric vehicles, an integral sliding-mode controller based on equivalent control is proposed. With the reaching condition imposed, the controller can guarantee the stability of closed-loop system and the robustness of system output. Based on the pseudo-output, which is defined by measured capacitor voltage and inductor current on Z-source network, a constant capacitor voltage control strategy for Z-source inverter is given. The simulation results show that the closed-loop control system for Z-source inverter can achieve better global robustness with zero steady error, and that the capacitor voltage on Z-source network can be stabilized so that good performances of motor drive system can be effectively realized. © 2012 IEEE.


Yu Y.,University of Science and Technology Beijing | Yu Y.,Key Laboratory of Advanced Control of Iron and Steel Process | Sun C.-Y.,University of Science and Technology Beijing | Sun C.-Y.,Key Laboratory of Advanced Control of Iron and Steel Process
2013 25th Chinese Control and Decision Conference, CCDC 2013 | Year: 2013

Robust attitude decentralized tracking control problem for a 3-DOF helicopter is investigated. The model of the 3-DOF helicopter is described as a MIMO strict-feedback form system with unknown parameters, bounded disturbances, nonlinear uncertain coupling effects and unknown input-delay. A new design method based on signal compensation technique and backstepping strategy is proposed. Based on the signal compensation method, at each backstepping design step, a robust controller consists of a nominal controller and a robust compensator. Robust practical tracking stability condition is derived in terms of linear matrix inequalities (LMIs). Experimental results demonstrate the effectiveness of the proposed control strategy. © 2013 IEEE.


Wang L.-J.,University of Science and Technology Beijing | Wang L.-J.,Key Laboratory of Advanced Control of Iron and Steel Process | Li Q.,University of Science and Technology Beijing | Li Q.,Key Laboratory of Advanced Control of Iron and Steel Process | And 4 more authors.
Kongzhi Lilun Yu Yingyong/Control Theory and Applications | Year: 2013

The control for systems with time-delay is a widely recognized challenging issue. Recently, the solutions are widely used for time-delay systems based on active disturbance rejection control (ADRC) methodology. On the basis of the principle of ADRC, some design methods of ADRC for time-delay systems are reviewed. Then some tuning methods of active disturbance rejection controller are introduced. Finally, the application prospect is pointed out.


Zhao X.,University of Science and Technology Beijing | Zhao X.,Key Laboratory of Advanced Control of Iron and Steel Process | Zhang Z.,University of Science and Technology Beijing | Meng W.,Nanyang Technological University
2012 International Conference on Computational Problem-Solving, ICCP 2012 | Year: 2012

Wireless based data acquisition solutions are widely used in many fields like structure monitoring, transportation or environmental studies. This paper presents a General Packet Radio Service (GPRS) based remote data acquisition and forecasting system, which monitors the geological disasters along the natural gas pipeline under the ground. The field data terminal units (DTU) collect data from the sensors installed on the pipe, and transmit the data by GPRS module to the server in the control center. The server processes the data, broadcasts on the website, and forecasts abnormal variation in time. Three years' operation in site shows the system is effective and feasible. © 2012 IEEE.


Liu L.-M.,University of Science and Technology Beijing | Tong C.-N.,University of Science and Technology Beijing | Tong C.-N.,Key Laboratory of Advanced Control of Iron and Steel Process
Proceedings - 2013 5th International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC 2013 | Year: 2013

The model of NCS (Networked Control Systems) with reduced dimension observer is presented when the network-induced random time-varying delays are bounded and the upper bound of which is longer than one sampling period. Thus we established a discrete-time jump system model with Markov delay. Based on this, this paper gave also design method of stabilizing controllers by the optimization method. This paper generalizes previous results on delay-less reduced dimension observer systems. Theoretical analysis and simulation on a cart and inverted pendulum with random time delay show that feedback control Based on reduced dimension observer can make the system stable. © 2013 IEEE.


Wang J.-Z.,University of Science and Technology Beijing | Wang J.-Z.,Key Laboratory of Advanced Control of Iron and Steel Process | Li J.-Y.,University of Science and Technology Beijing | Li J.-Y.,Key Laboratory of Advanced Control of Iron and Steel Process
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2014

For AC to AC variable frequency speed drive system of synchronous motors applied in hot strip continuous mills, the harmonic impact on power supply net side is analyzed in detail by advanced simulation approach. Variety of situations have been studied by changing parameters of different parts in the synchronous frequency speed drive system, such as internal inductance of original/secondary sides of the transformers, external line commutating reactors and several kinds of synchronous motors with different resistance and inductance. An approach of power supply is proposed that adopting multi-group AC-AC inverters with incremental-shifting phase module to supply power. A comparative analysis of harmonic interference between the AC-AC inverter and AC-DC-AC inverter is given. Simulation results show that the approach combination regulating transformer inductance with the incremental-shifting phase modular power supply can effectively reduce harmonic interference and make the total harmonic distribution tend to be balanced in three phases.


Yu Y.,University of Science and Technology Beijing | Yu Y.,Key Laboratory of Advanced Control of Iron and Steel Process | Sun C.-Y.,University of Science and Technology Beijing | Sun C.-Y.,Key Laboratory of Advanced Control of Iron and Steel Process | Jiao Z.,Beijing Institute of Electronic System Engineering
International Journal of Robust and Nonlinear Control | Year: 2014

A new control design method based on signal compensation is proposed for a class of uncertain multi-input multi-output (MIMO) nonlinear systems in block-triangular form with nonlinear uncertainties, unknown virtual control coefficients, strongly coupled interconnections, time-varying delays, and external disturbances. By this method, the controller design is performed in a backstepping manner. At each step of backstepping procedure, a nominal virtual controller is first designed to get desired output tracking for the nominal disturbance-free subsystem, and then a robust virtual compensator is designed to restrain the effect of the uncertainties, delays involved in the subsystem, and the couplings among the subsystems. The designed controller is linear and time-invariant, so the explosion of complexity in the control law is avoid. It is proved that robust stability and robust practical tracking property of the closed-loop system can be ensured, and the tracking errors can be made as small as desired. Copyright © 2013 John Wiley & Sons, Ltd.


Qun Y.,University of Science and Technology Beijing | Qun Y.,Key Laboratory of Advanced Control of Iron and Steel Process | Qing L.,University of Science and Technology Beijing | Zhang P.,University of Science and Technology Beijing | Yu D.,University of Science and Technology Beijing
26th Chinese Control and Decision Conference, CCDC 2014 | Year: 2014

Proton Exchange Membrane Fuel cell has many perfect characters and becomes one of the most important research subjects among domestic and international fuel cell fields. Heat transfer management is one of the key technologies for PEM fuel cell. This paper built a temperature model of PEM fuel cell based on fuzzy technology, which divided the fuzzy space evenly by established rules, got the number of fuzzy rules and rules application degree, identified the consequent parameters by least square method. This model is fit for multi-variables and has simple construction and high accuracy. Finally, simulation examples show the effectiveness of the modeling. © 2014 IEEE.


Wang L.,University of Science and Technology Beijing | Wang L.,Key Laboratory of Advanced Control of Iron and Steel Process | Guo H.,China Energy Conservation and Emission Reduction Co.
Chinese Control Conference, CCC | Year: 2014

Soft-sensors have been widely used for estimating product quality or other key variables. To achieve high estimation performance for soft-sensor design, it is important to select appropriate input or explanatory variables. This paper presents a new feature selection method applied to Soft-sensors. The proposed method, referred to as FCA-ARM (fuzzy clustering analysis-association rule mining). The measured variables were first clustered on the basis of the correlation by fuzzy clustering analysis, and each variable cluster was further evaluated by association rules mining, which can discover the important input variables that are related to the output variable based on the Apriori algorithm. By applying this method with the influence degree analysis, the overlap information can be effectively eliminated, and the important variables can be obtained as input variables. The usefulness of the proposed FCA-ARM feature selection method is demonstrated through an application to mechanical property forecasting in industrial hot rolling process. © 2014 TCCT, CAA.


Yu Y.,University of Science and Technology Beijing | Yu Y.,Key Laboratory of Advanced Control of Iron and Steel Process | Jiao Z.,Beijing Institute of Electronic System Engineering | Sun C.-Y.,University of Science and Technology Beijing | Sun C.-Y.,Key Laboratory of Advanced Control of Iron and Steel Process
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2013

This paper focuses on the admissibility condition for fractional-order singular system with order α ∈ (0, 1). The definitions of regularity, impulse-free and admissibility are given first, then a sufficient and necessary condition of admissibility for fractional-order singular system is established. A numerical example is included to illustrate the proposed condition. Copyright © 2013 Acta Automatica Sinica. All rights reserved.

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