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Tang Hou-jun

Bio: Tang Hou-jun is an academic researcher from Shanghai Jiao Tong University. The author has contributed to research in topics: Voltage regulator & Wireless power transfer. The author has an hindex of 6, co-authored 14 publications receiving 109 citations.

Papers
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Proceedings ArticleDOI
17 May 2009
TL;DR: In this article, the steady-state equivalent circuit of the buck-boost chopper type AC voltage regulator, as well as the theoretical analysis method of the input power factor and the output voltage is presented.
Abstract: Traditional AC voltage regulator used servo-motor position regulation or thyristor phased controlled method which had low dynamic response speed or large amount of harmonic components. However, these drawbacks can be overcome by using Pusle Width Modulation chopper techniques in AC voltage regulation. Buck-Boost Chopper type AC voltage regulator, derived from the DC chopper modulated method, is a kind of direct AC-AC voltage converter and has many advantages: such as fast response speed, low harmonics and high power factor. It adopts high switching frequency AC chopper techniques and can do wide range stepless AC voltage regulation. The steady-state equivalent circuit of the Buck-Boost chopper type AC voltage regulator, as well as the theoretical analysis method of the input power factor and the output voltage is presented in this paper. In addition, in order to solve the problems caused by the sags or swells of the input voltage, the output voltage controller is designed. The proposed voltage controller uses output peak voltage as feedback signal and adopts PI control strategy to regulate the output voltage. Digital simulation results coincide with the theoretical analysis and show that the Buck-Boost chopper type voltage regulator has a unit input power factor and that the designed voltage controller can stabilize the output voltage with fast dynamic speed when input voltage fluctuations occur.

24 citations

Journal ArticleDOI
TL;DR: In this article, the frequency splitting and frequency bifurcation discussed frequently in inductively coupled wireless power transfer system were analyzed comparatively based on the circuit model and a half-bridge inverter based wireless power system was constructed to demonstrate the experimental results.
Abstract: Frequency splitting is a key characteristic of wireless power transfer system. With the increases of coupling coefficient, the power transferred to load drops sharply. The resonant frequency splits from one into two within splitting region. Previous reports about frequency splitting mainly focused on the analysis of coupled mode theory or the solutions of ridge equations. In this work, we presented the analytical results based on a simply T-type circuit model. With impedance analysis, the even and odd splitting frequencies were derived. In addition, the frequency splitting phenomena were analysed with output voltage curves at different coupling by the aid of simulation. Furthermore, the frequency splitting and the frequency bifurcation discussed frequently in inductively coupled wireless power transfer system were analysed comparatively based on the circuit model. Then, a half-bridge inverter based wireless power system was constructed to demonstrate the experimental results. Finally, the simulation and experimental results validated the theoretical analysis. DOI: http://dx.doi.org/10.5755/j01.eee.19.10.5455

24 citations

Proceedings ArticleDOI
01 Jul 2006
TL;DR: In this article, a new vehicle integrated robust model matching controller (R-MMC) is proposed that cooperates four wheel steering and direct yaw moment control to improve the vehicle handling performance and stability.
Abstract: This study proposes a new vehicle integrated robust model matching controller (R-MMC) that cooperates four wheel steering and direct yaw moment control to improve the vehicle handling performance and stability. The design frame work of the R-MMC is based on linear matrix inequalities (LMIs) in this study. Since vehicle sideslip angle measurement is difficult to achieve in practice, a LMI-based sliding mode observer (SMO) that requires only vehicle yaw rate as the measured input is also developed. The performance and robustness of the SMO and the integrated controller are demonstrated under critical steering maneuvers and road surface conditions. Simulation results reveal the satisfactory tracking ability of the SMO, and the superior improved vehicle handling performance, stability and robustness of the integrated control vehicle.

24 citations

Journal Article
TL;DR: In this paper, an improved topology of buck type AC chopper voltage regulator and its control strategy are proposed, which is low cost, easy implemented and the phase synchronized circuit is not needed.
Abstract: In this paper, an improved topology of Buck type AC chopper voltage regulator and its control strategy are proposed. This converter only using two power switches is low cost, easy implemented and the phase synchronized circuit is not needed. The current path is provided in dead-time period by using simple snubber circuit. The over-voltage protection varistor is also applied to absorb the voltage spikes which may destroy the power switches. The voltage spikes in dead-time mode commutation are greatly reduced and the power switches are protected. Furthermore, the feedforward and feedback control strategy is proposed to suppress fluctuations and eliminate the harmonic components caused by power quality problems of the input voltage. The proposed converter could realize wide range voltage regulation with high power transfer efficiency and low total harmonic distortion. The steady-state equivalent circuit and the input power factor are derived through theoretical analysis. The output filter design method is also presented. Based on the theoretical analysis and calculation, an experimental prototype is setup. The simulation and experiment results verify the validity of the proposed design.

11 citations

Proceedings ArticleDOI
17 Nov 2009
TL;DR: In this paper, the authors presented the modeling and control of buck chopper type AC voltage regulator while the system is operating under uncertainty and nonlinearity, and the PID gains are tuned using improved Heb learning algorithm with single neuron network architecture, which reduce the computational complexity and adjust the controller gains in online way.
Abstract: The PID controller has been used as the effective control method. The proper adjustment of the gains is of great importance to obtain the desired performance of the controller. However, it is necessary to find suitable PID gains automatically. This paper presents the modeling and control of Buck chopper type AC voltage regulator while the system is operating under uncertainty and nonlinearity. The PID gains are tuned using improved Heb learning algorithm with single neuron network architecture, which reduce the computational complexity and adjust the controller gains in online way. The developed controller in this work, offer inherent advantages over conventional PID controller, namely: improvement of the adjusting time, output voltage overshoot and control system robustness. These advantages make the proposed method have better dynamic performance. The simulation results verify the validity and robustness of the method used in the ac voltage regulator system.

9 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, an efficient method is proposed to eliminate frequency splitting in nonradiative wireless power transfer via magnetic resonance coupling, where two NIRCs are used as wireless power transmitter and receiver, respectively.
Abstract: In this paper, an efficient method is proposed to eliminate frequency splitting in nonradiative wireless power transfer via magnetic resonance coupling. In this method, two nonidentical resonant coils (NIRCs) are used as wireless power transmitter and receiver, respectively. According to the elliptic integral term in the analytical expression, the pole of the mutual inductance function with respect to transfer distance can be eliminated by using the two NIRCs, and hence overcoupling between transmitter and receiver with close transfer distance is avoided. Therefore, frequency splitting caused by overcoupling can be suppressed and stable output power can be achieved. The NIRCs are analytically calculated, numerically simulated and finally, fabricated and tested to verify the theory. All the calculated and experimental results show that frequency splitting is completely eliminated and uniform voltage across the load is achieved. Furthermore, lateral misalignment between the NIRCs barely introduces frequency splitting, and the suppression level of frequency splitting can also be controlled freely.

109 citations

Journal ArticleDOI
TL;DR: In this paper, an active disturbance rejection (ADR) approach for the control of a buck-boost-converter feeding a dc motor is presented. But the proposed control scheme is a sensorless one with robustness features added to the traditional energy shaping plus damping injection methodology.
Abstract: This paper presents an active disturbance rejection (ADR) approach for the control of a buck-boost-converter feeding a dc motor. The presence of arbitrary, time-varying, load torque inputs on the dc motor and the lack of direct measurability of the motor's angular velocity variable prompts a generalized proportional integral (GPI) observer-based ADR controller which is synthesized on the basis of passivity considerations. The GPI observer simultaneously estimates the angular velocity and the exogenous disturbance torque input in an on-line cancellation scheme, known as the ADR control. The proposed control scheme is thus a sensorless one with robustness features added to the traditional energy shaping plus damping injection methodology. The discrete switching control realization of the designed continuous feedback control law is accomplished by means of a traditional PWM-modulation scheme. Additionally, an input to state stability property of the closed-loop system is established. Experimental and simulation results are provided.

88 citations

Journal ArticleDOI
TL;DR: In this article, a hybrid real-coded genetic algorithm-pattern search (RGA-PS) method is proposed for output voltage harmonic elimination and voltage control of PWM AC/AC voltage converters using the principle of hybrid Real-Coded Genetic Algorithm-Pattern Search.

50 citations

Journal ArticleDOI
TL;DR: In this article, a multi-layer integrated controller of active front steering and direct yaw moment is developed, where the desired value for yaw rate and sideslip angle are obtained from a Four-Degrees of Freedom (DOF) non-linear vehicle model.
Abstract: A multi-layer integrated controller of active front steering and direct yaw moment is developed in this study. In the upper layer, the corrective steering angle and yaw moment are obtained using Sliding Mode Control (SMC) with combined sliding surface. The corrective yaw moments are applied by electric motors embedded in rear wheels. The desired value for yaw rate and sideslip angle are obtained from a Four-Degrees of Freedom (DOF) non-linear vehicle model. In the lower layer, wheel slip and electric motor torque controllers are designed. A 9-DOF non-linear vehicle model is used for simulations and their results illustrate considerable improvements in vehicle handling.

29 citations

Dissertation
01 Apr 2013
TL;DR: In this article, a parallel design optimization (PDO) method is developed and applied to the design of multi-trailer articulated heavy vehicles (MTAHVs) with integrated active safety systems, which involve active trailer steering (ATS), anti-roll (AR), and differential braking (BD) control.
Abstract: Multi-trailer articulated heavy vehicles (MTAHVs) exhibit unstable motion modes at high speeds, including jack-knifing, trailer swing, and roll-over. These unstable motion modes may lead to fatal accidents. On the other hand, these vehicle combinations have poor maneuverability at low speeds. Of all contradictory design criteria of MTAHVs, the trade-off relationship between the maneuverability at low speeds and the lateral stability at high speeds is the most important and fundamental. This trade-off relationship has not been adequately addressed. The goal of this research is to address this trade-off relationship through the design optimization of MTAHVs with active safety systems. A parallel design optimization (PDO) method is developed and applied to the design of MTAHVs with integrated active safety systems, which involve active trailer steering (ATS) control, anti-roll (AR) control, differential braking (BD) control, and a variety of combinations of these three control strategies. To derive model-based controllers, a single-trailer articulated heavy vehicle (STAHV) model with 5 degrees of freedom (DOF) and a MTAHV model with 7 DOF are generated. The vehicle models are validated with those derived using a commercial software package, TruckSim, in order to examine their applicability for the design optimization of MTAHVs with active safety systems. The PDO method is implemented to perform the concurrent design of the plant (vehicle model) and controllers. To simulate the closed-loop testing maneuvers, a driver model is developed and it is used to drive the virtual vehicle following the prescribed path. Case studies indicate that the PDO method is effective for identifying desired design variables and predicting performance envelopes in the early design stages of MTAHVs with active safety systems.

25 citations