Xinchun Lin

Huazhong University of Science and Technology, Wuhan, Hubei, China

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Publications (18)4.08 Total impact

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    ABSTRACT: This paper focuses on the modeling and optimization of the laminated busbar used in high power inverters. First, through the circuit structure analysis, the commutation loops of the laminated busbar are analyzed in a single-phase H-bridge inverter; then, the commutation loops are modeled and simulated via the three-dimensional (3-D) finite element simulation, and unbalanced commutation loops' inductances of the original three-layer laminated busbar are obtained. Additionally, a low cost and accurate parasitic inductance extracted measurement method for the busbar, which is based on the equalization of resonance impedance, is proposed; then, a compromised optimal design scheme is suggested to balance and minimize the parasitic inductance of the busbar, and this optimal scheme is verified by simulations. Finally, some optimization principles of laminated busbar are proposed.
    Energy Conversion Congress and Exposition (ECCE), 2012 IEEE; 01/2012
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    ABSTRACT: The dynamic voltage restorer (DVR) is among the most cost-effective solution against voltage sags. By using the transformer coupled topology, DVR could take the advantage of electrical isolation and voltage boost. However, at the start of compensation, the injection transformer may experience a flux linkage that is up to twice its steady-state value. The flux linkage will be driven to the level of magnetic saturation and severe inrush current occurs. Oversizing the transformer is a common approach to avoid the inrush current, but this would dramatically increase the cost, size and weight. This paper proposes a new technique for mitigating the inrush current. By taking use of the relationship between injection voltage and flux linkage, this method is characterized by interrupt compensation around the peak or trough of injection voltage to make the interruption time shortest. Detailed explanations of this technique are presented, and the effectiveness of this scheme is verified by laboratory test results.
    Energy Conversion Congress and Exposition (ECCE), 2012 IEEE; 01/2012
  • Jun Tan, Xinchun Lin, Yuping Duan, Jun Qiu
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    ABSTRACT: The dynamic voltage restorer (DVR) is designed to protect sensitive loads from the effects of voltage sags on the distribution feeder. The capability of DVR in compensating long-duration voltage sags is largely depended on the amount of stored energy within the restorer which is very expensive. In order to reduce the price of DVR, many control strategies have been implemented to make better use of the stored energy. Unfortunately, the traditional voltage compensation strategies are merely designed to minimize the needed compensation voltage to extract more energy from the DC-link or to decrease the output active power of DVR or to reduce the distortions at the load. To combine the advantages and avoid the drawbacks of the traditional strategies, an optimized control strategy has been designed and tested by MATLAB simulation. The new strategy can dramatically increase the compensation time with low distortion at the load and without enlarging the energy storage of the DC-link.
    01/2011;
  • Xinchun Lin, Shan Gao, Jinda Li, He Lei, Yong Kang
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    ABSTRACT: The three-level neutral-point-clamped (NPC) inverter has attracted significant interest for high power/voltage applications, due to its significant advantages. A drawback of NPC inverter is that it is prone to voltage drifts and low-frequency voltage ripples of the neutral-point. In this paper, a novel control strategy of neutral-point balancing under SVPWM-based switching strategy is proposed which can be generally applied for all NPC inverters. Different from the previous control strategies, the proposed strategy utilizes a proportional resonant (PR) controller, which not only can eliminate voltage drifts, but also can minimize low-frequency voltage ripples at the same time. The effectiveness of the approach is documented by experiments obtained from a grid-tie three-phase NPC inverter.
    01/2011;
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    ABSTRACT: This paper presents a dual-loop control scheme in αβo coordinates for paralleled three-phase four-leg voltage source inverters. Using α-β-o coordinate, output voltages of the inverter can be controlled in each channel (αβo) independently as the voltage component in relating to the inductor in the fourth leg only exists in o-channel. The use of interleaving for paralleled three-phase four-leg inverter would contribute to harmonic cancellation. For control loop, a proportional-resonant regulator in the outer loop and a proportional regulator in the inner loop are incorporated. Meanwhile a state observer for estimating the output voltage and inductor current in each channel is introduced to compensate one time-step delay of the system. The performance of proposed control scheme is verified by experimental results.
    01/2011;
  • Sheng Hu, Xinchun Lin, Yong Kang, Xudong Zou
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    ABSTRACT: This paper presents a control strategy to improve the low-voltage ride-through capability of a doubly fed induction generator (DFIG); since the stator of a DFIG is directly connected to a grid, this sort of machine is very sensitive to grid disturbance. Grid voltage sag causes overcurrents and overvoltages in rotor windings, which can damage the rotor-side converter (RSC). In order to protect the RSC, a classical solution based on installation of the so-called crowbar is adopted; however, as the DFIG absorbs reactive power from the grid, this type of solution deteriorates grid voltage sags and cannot meet the requirements of a new grid code. An improved control strategy which uses virtual resistance to limit rotor side overcurrents is proposed in this paper, which can make a crowbar inactive and supply reactive power to fulfill the latest grid code requirement during voltage sags. In order to validate the proposed strategy, simulations and experiments have been carried out, and the results demonstrate the effectiveness of the proposed strategy.
    IEEE Transactions on Power Electronics 01/2011; 26(12):3653-3665. · 4.08 Impact Factor
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    ABSTRACT: A dual-loop control scheme in a-b-c coordinate for three-phase four-leg pulse width modulation (PWM) boost-type rectifier for double conversion transformerless uninterruptible power supplies (UPS) is presented in this paper. Analysis of the power flow from front-end rectifier to back-end inverter is performed according to instantaneous power theory. The inverter will absorb additional oscillating power when the load is unbalanced. The additional oscillating power can be provided by DC-bus capacitor, but the DC-bus voltage will have the same oscillating component which has a negative impact on the controller for rectifier. The DC-bus voltage feedback in outer control loop can be delayed by quarter fundamental period to filter out the oscillating component. The performance of proposed control scheme is verified by experimental results.
    01/2011;
  • Dihua Li, Xinchun Lin, Sheng Hu, Yong Kang
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    ABSTRACT: This paper purposes an adaptive parameter estimation algorithm which is basis on the decoupled vector control modeling of DFIG. Through designing state observer and selecting a proper Lyapunov function, the parameters of DFIG can be estimated, the simulation and experiment shows the feasibility of this method.
    Power and Energy Engineering Conference (APPEEC), 2010 Asia-Pacific; 05/2010
  • Sheng Hu, DiHua Li, Yong Kang, XinChun Lin
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    ABSTRACT: A nonlinear control strategy based on its decoupled vector control model is proposed in this paper for DFIG . by using the feedback linearization, the control algorithm is established, the simulations and experiments show the feasibility of this method.
    01/2010;
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    ABSTRACT: This paper presents an analysis of the transmission line impedance effect of X/R ratio on voltage quality for grid connected to wind turbines. By employing power flow analysis, the causes for voltage deviation and fluctuation are discussed and the investigation is taken to address the confusions about the effect of X/R ratio. A simulation model of a MW-level fixed speed wind turbine developed in Matlab/Simulink and PLECS co-simulation environment. Conclusions are drawn through detailed simulation studies.
    Power Electronics and Motion Control Conference, 2009. IPEMC '09. IEEE 6th International; 06/2009
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    ABSTRACT: The nonlinear control especially the feedback linearization is widely used in the induction motor control and PWM converters nowadays. The feedback linearization control performance can be improved by solving the problems caused by the sampling and calculating time of digital processor. The proposed new feedback linearization in this paper is by employing the state observer and predictive controller. Simulation and experimental results validate the analytical predictions.
    01/2009;
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    ABSTRACT: DC power distribution network is widely used in long-distance and large-capacity transmission, undersea transmission, and interconnection system for its small system loss and high controlled characteristic. The fault current limiter (FCL) takes a very important part in the DC distribution system. Since there is no natural zero crossing point of the current in DC system, it is more difficult to limit fault current in DC system than in AC system. Low shortcut impedance could lead to a high current rate of rise, which can cause heat, arc and electrical stress damage to the DC system in such a short time when the breakers are not ready to act. This paper proposed a new type of solid state fault current limiter to restrain the shortcut current and to make sure the breakers act correctly. In normal situation, the limiter plays as a transmission tine. But when fault occurs, it works as a buck circuit to control the fault current within a certain desired range. In this way, the fault damage can be reduced. Experiment results can be taken to prove the limiter.
    01/2009;
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    ABSTRACT: The traditional procedure for analyzing switching converters is based on linearized smooth averaged (small-signal) models and the performance is limited because of the inaccurate model. In this paper, the feedback linearization techniques are proposed to design stabilizing robust controllers for PWM DC-DC converters. Simulation and experimental results validate the analytical predictions.
    01/2009;
  • Xiaohu Liu, Xinchun Lin, Yong Kang, Kevin Lee
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    ABSTRACT: This paper addresses the problem resulted from limited capacity of STATCOM at medium voltage level of 4.16kV and proposes the solution by combining a three-level neutral point clamped (NPC) based STATCOM with TSC. A 6 MW wind farm is constructed in the co-simulation platform between Matlab and PLECS. The simulation results validate the analytical predictions of combing STATCOM and TSC for the reactive power compensation cost effectively.
    01/2009;
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    ABSTRACT: Islanding, detection is a mandatory function for gird-connected converters. The popular slip mode frequency shift and auto phase shift active islanding detection methods are investigated and an improved slip mode frequency shift (IM-SMS) strategy is proposed in this paper. In the proposed method, additional phase shift is introduced to help stimulating the islanding detection function and the algorithm is simplified as well. When the utility grid is disconnected, the algorithm keeps the frequency of the converter output voltage deviating until the frequency protection relay is triggered. The working principle of the method is introduced and the guidance of parameters selection is also provided. The islanding detection performance is evaluated through theoretical analysis, digital simulation and experiment. The IM-SMS method exhibits features of simplicity, easy implementation and high reliability and is expected to be an effective active islanding method.
    Industrial Electronics and Applications, 2008. ICIEA 2008. 3rd IEEE Conference on; 07/2008
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    ABSTRACT: DC power distribution network is specifically used in industrial manufactures and aircraft/ship power distribution since it can provide flexible interface to various power converters with high efficiency and less conversion stage. The protection for DC power distribution system is more difficult compared with those AC systems since there's no natural zero crossing point for the current. Low shortcut impedance will cause high current rising rate, which can bring heat, arc and electrical force damage to the DC power distribution grid in a quite short time that the DC breakers hardly act. This paper proposed a solid state fault current limiter (FCL) using a combined power switch. Solid state FCL can achieve fast response to the fault current in the DC power grid, without special requirement of the cooling system. Using a combined power switch instead of single fully controlled power electronics component can reduce the steady power loss while normal working states. When fault states occurs, the power electronics control technique can strictly limits the fault current beneath a certain desired range. In that way, the fault damage can be limited. Experiment results are taken to prove this design.
    Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE; 03/2008
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    ABSTRACT: This paper proposes a new control scheme based on a two-layer control structure to improve both the transient and steady-state responses of a PWM inverter in UPS. The experiment results show that this control scheme can achieve both fast dynamic responses and low harmonics distortion.
    Power Electronics and Drive Systems, 2001. Proceedings., 2001 4th IEEE International Conference on; 11/2001
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    ABSTRACT: This paper proposes a new control scheme based on two parallel controllers to improve both the steady and transient state responses of close-loop regulated pulse-width-modulated (PWM) inverter for UPS. The controller consists of the repetitive and instantaneous controllers. The repetitive controller is designed to eliminate periodic disturbance and the instantaneous controller is synthesized for transient state response improvement. Design procedure is given for synthesizing the repetitive and instantaneous controllers. The proposed control scheme has been realized using a single-chip digital signal processor (DSP) TMS320F240 from Texas instruments. A 7.5 kVA UPS has been constructed to verify the proposed control scheme. Simulation and experimental results show that the DSP-based fully digital-controlled UPS can achieve both low total harmonics distortion and good dynamic response.
    Power Electronics and Drive Systems, 2001. Proceedings., 2001 4th IEEE International Conference on; 11/2001