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Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE

Date 3-5 Nov. 2009

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Displaying Results 1 - 25 of 766
  • [Title page]

    Publication Year: 2009 , Page(s): 1 - 2
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  • Message from the general chairs

    Publication Year: 2009 , Page(s): 3 - 4
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  • Power electronics and renewable energy

    Publication Year: 2009 , Page(s): 5 - 6
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  • Comparison between integrated and simplified ZVT topologies for three-phase voltage-source inverters

    Publication Year: 2009 , Page(s): 7 - 12
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1047 KB) |  | HTML iconHTML  

    This paper presents a comparison between the integration and simplification principles of zero-voltage-transition (ZVT) circuits applied to three-phase inverters. Initially, both approaches are defined, and their advantages and limitations are identified. Thereafter, a comparison is made between two selected topologies, taking into account their modulation strategies, the resulting losses in the main and auxiliary circuits, and the harmonic content of the voltage synthesized by the converter. Finally, experimental results for the selected topologies operating at 1.5 kW and 20 kHz are presented in order to validate the proposed methodology. View full abstract»

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  • A comparison of operation mode for soft-switching PFC converter for induction heating cooking appliance

    Publication Year: 2009 , Page(s): 13 - 18
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB) |  | HTML iconHTML  

    Harmonic currents generated from the power electric equipment such as IH cooking heaters involve harmful influences to the other equipments connected to the utility grid. As for the IH cooking appliances, adding the PFC converter to the input stage of IH cooking heater is one of the practical solutions to suppress harmonic current influences. In this paper, two operation modes; DCM and CCM for the PFC converter are compared and tested from the view points of magnetic volume and power quality to clarify the suitable operation mode for consumer IH cooking appliance. View full abstract»

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  • A constrained optimization approach to the control of inverters

    Publication Year: 2009 , Page(s): 19 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1198 KB) |  | HTML iconHTML  

    In this paper, a constrained optimization based approach is proposed for the switching control of inverters. This method achieves the best tracking performance of three phase currents, or equivalently the best tracking of torque command. This approach may be viewed as an improved SVM (space vector modulation) method. Detailed performance analysis proves that in the overmodulation region, a relative ratio of improvement up to 15.4% is achieved over SVM. Meanwhile, the computation complexity is the same as SVM. Further, numerous simulations verify that the proposed approach outperforms both PWM and SVM in the overmodulation region. View full abstract»

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  • A control strategy for parallel operation of single phase voltage source inverters

    Publication Year: 2009 , Page(s): 25 - 30
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (833 KB) |  | HTML iconHTML  

    This paper presents a simple, effective and robust control strategy applied to parallel connected single phase voltage source inverters. The proposed control strategy has two control loops with instantaneous average values: one for voltage and another for current. The first one controls the output voltage of the inverter while the second controller is designed to lead the parallel operation of the inverters. The intended parallelism control acts in the voltage before the LC filter and it is based on the feedback of the L inductor current. Its objective is to guarantee the correct load current sharing. The inverters are independent of each other and there is no communication among them. A prototype with three 5 kVA inverters each was built to corroborate the control technique. View full abstract»

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  • A detailed analysis of a power converter to buffer the battery voltage in lift trucks

    Publication Year: 2009 , Page(s): 31 - 36
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (582 KB) |  | HTML iconHTML  

    To increase the total system efficiency of electric vehicles and the lifetime of traction batteries one approach is connecting electric double layer capacitors in parallel to the batteries via a dc-dc converter. Here, from the efficiency point of view the best voltage range for the capacitors is derived. Based on the maximum capacitor voltage four different dc-dc converter circuits are analyzed, simulated, and compared to each other. The most promising topology is selected, built-up and implemented in an existing lift-truck traction system. Important equations for the design, simulation and selection of the topology are presented. Measurements and simulations prove the benefit of the additional circuit. View full abstract»

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  • A dual-loop PI controller for a DC/DC full-bridge power converter with ZVS modulation

    Publication Year: 2009 , Page(s): 37 - 41
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (414 KB) |  | HTML iconHTML  

    The analysis and design of a zero voltage switching (ZVS) full bridge DC/DC converter control is discussed in this paper. The power converter is used to regulate the output dc voltage. With this objective, the control strategy presented here is designed based in the equations that describe the output current and output voltage dynamics. The proposed controller employs a dual-loop scheme implemented with two proportional-integral blocks. The performance of the controller is verified through several simulations, showing that the voltage at the dc-link is regulated to the desired reference value ensuring a correct operation of the selected topology. View full abstract»

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  • A fast maximum power point tracking technique for PV powered systems

    Publication Year: 2009 , Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (523 KB) |  | HTML iconHTML  

    A novel maximum power point tracking (MPPT) technique for photovoltaic (PV) is introduced which eliminates drawbacks of common methods such as oscillation at steady state condition and confusion under rapidly changing insolation. This paper introduces a new index which puts nonlinear relation of the solar cells in linear form. Although the introduced method is developed based on the solar modules model, it can be tuned automatically and compensate temperature variation effect. Simulation results prove fast and reliable response of the method and practical PV data show better noise immunity. View full abstract»

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  • A method of predictive current control with reduced number of calculations for five-phase voltage source inverters

    Publication Year: 2009 , Page(s): 53 - 58
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (466 KB) |  | HTML iconHTML  

    This work proposes the application of model predictive control (MPC) to the control of five-phase voltage source inverters. The additional switching states and degrees of freedom present in multiphase inverters increase the number of calculations in the predictive control algorithm making difficult to implement optimization problem online. In this paper a method to reduce the calculations is proposed. MPC prove to maintain the same simplicity and effectiveness as for three-phase converters. The successful performance of the proposed method of control for five-phase converters is verified by simulation. View full abstract»

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  • A model for a novel variable speed cage induction generator

    Publication Year: 2009 , Page(s): 59 - 64
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1025 KB) |  | HTML iconHTML  

    This paper presents a novel cage induction generator and a mathematical model, through which its behavior can be accurately predicted. The novelty of the generator is due mainly to the constant frequency electricity generation, without an intermediate inverter stage, by a 3-phase cage induction machine operated at varying rotor speeds. The technique uses any one of the three stator phases of the machine as the excitation winding, and the remaining two phases, connected in series, as the power winding. The two series-connected and one isolated (TSCAOI) phase winding configuration magnetically decouples the two sets of windings, enabling independent control. Electricity is generated through the power winding with appropriate excitation to the isolated single winding at any desired frequency, using a simple single-phase square-wave inverter or a reversible rectifier, when the rotor is driven at variable speed. The mathematical model, which accurately represents the proposed generator, is implemented in Matlab/Simulink. Simulations of the TSCAOI power generation under various operating conditions suggest that the proposed technique is viable, and is expected to gain popularity being simple, low-in-cost and not requiring output filtering for grid-integration. View full abstract»

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  • A model reference adaptive controller for a wind energy conversion system based on a permanent magnet synchronous generator fed by a matrix converter

    Publication Year: 2009 , Page(s): 65 - 70
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB) |  | HTML iconHTML  

    This paper presents a Model Reference Adaptive Control (MRAC) approach for a Wind Energy Conversion System (WECS) to track the maximum power point. This WECS includes a permanent magnet synchronous generator (PMSG) fed by a matrix converter. Since the mechanical power generated by the wind turbine is a function of its shaft speed at a given wind velocity, the proposed controller provides the desired voltage at the output of the matrix converter so as to control the generator speed. This controller is based on the model reference adaptive control approach to track the optimum speed. In addition, the controller is robust against system uncertainties and high frequency disturbances. Theoretical analysis verifies the global stability and performance of the proposed approach. Simulation results are included which show that the proposed approach has a superior performance compared to the conventional PI controller. View full abstract»

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  • A neutral-point voltage balance technique for a diode-clamped three-level PWM rectifier based on fuzzy control

    Publication Year: 2009 , Page(s): 71 - 75
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB) |  | HTML iconHTML  

    The reason why the neutral point (NP) voltage unbalance is analyzed in detail and a Fuzzy Controller based on control index proposed. This way to balance the NP voltage is simple and need not extra hardware cost. Fuzzy controller can automatically and intelligently adapt the value of the control index and change the operation time duration of the small vectors. The Fuzzy controller design has been discussed and the experimental results verify that the proposed technique is correct and the balance of the NP voltage guarantees high power factor of TL-PWM rectifier. View full abstract»

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  • A novel current controller for three-phase voltage-source inverters

    Publication Year: 2009 , Page(s): 76 - 81
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (950 KB) |  | HTML iconHTML  

    A novel vector-based hysteresis current controller for three-phase PWM voltage-source inverters is proposed in this paper. This current control scheme implements two sets of hysteresis comparators in three-phase abc and stationary ¿-ß frames integrated with a switching table. 2-level three-phase comparators are employed as region detector to confine the optimal voltage space vectors to be applied. Then, the appropriate voltage space vector at each instant is determined using two 3-level comparators with narrow hysteresis band working in ¿-ß coordinated frame. The proposed control scheme utilizes the advantages of both space vector modulation and hysteresis current controllers. Simulation studies are carried out to demonstrate the improvements achieved by the proposed method. View full abstract»

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  • A novel wide voltage range bi-directional series resonant converter with clamped capacitor voltage

    Publication Year: 2009 , Page(s): 82 - 87
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (777 KB) |  | HTML iconHTML  

    Bi-directional DC-DC converters become more and more important in the applications of future plug-in hybrid electric vehicles (PHEV's) charging stations and distributed renewable power generations as the interface with battery energy storage system. Maintaining high power efficiency in wide voltage range is required since the battery pack voltage varies a lot. Based on previous study, the series resonant converter with clamped capacitor voltage exhibits excellent characteristics in forward mode operation, such as high efficiency, high power density and fault current limiting capability; but very limited study has been performed for reverse mode operation. In this paper, the power stage design based on efficiency optimization for forward mode has been proposed to meet specifications of 750 V input, 300 V-600 V/35 kW output and 50 kHz switching frequency. For reverse mode operation, the advanced control strategy with three phase-shift angles has been proposed, since simple phase-shift control cannot reverse power flow. The proposed control strategy is successfully verified by a 15 kW prototype. View full abstract»

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  • A reduced switch transformer-less dual hybrid active power filter

    Publication Year: 2009 , Page(s): 88 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB) |  | HTML iconHTML  

    This paper proposes transformer-less dual hybrid topologies suitable for rectifier type load. Performance of the reduced switch version of the network is highlighted. It consists of two inverters, one operates at a lower frequency (typically around 550 Hz) and the other operates at higher frequency (around 20 kHz). Less number of switches is used to improve reliability and reduce cost. The low frequency inverter is in series with a passive filter to optimally eliminate 5th and 7th harmonics, whereas the high frequency inverter is connected to a passive filter to optimally eliminate 11th and 13th harmonics in addition to the other harmonics of the load and any additional harmonics generated by the low frequency inverter. The usefulness of the proposed topology is confirmed by simulation and prototype experimentation in the laboratory. View full abstract»

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  • A robust control of double-feed induction generator for wind power generation

    Publication Year: 2009 , Page(s): 94 - 99
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (418 KB) |  | HTML iconHTML  

    Modern wind turbines are capable to work in variable speed operations. These wind turbines are provided with adjustable speed generators, like the double feed induction generator. One of the main advantage of adjustable speed generators is that they improve the system efficiency compared to fixed speed generators because turbine speed is adjusted as a function of wind speed to maximize output power. However this system requires a suitable speed controller in order to track the optimal wind turbine speed reference. In this work, a sliding mode control for variable speed wind turbines is proposed. The stability analysis of the proposed controller is provided under disturbances and parameter uncertainties by using the Lyapunov stability theory. Finally simulated results show, on the one hand that the proposed controller provides high-performance dynamic characteristics, and on the other hand that this scheme is robust with respect to the uncertainties that usually appear in the real systems. View full abstract»

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  • A simple control algorithm to avoid flux density bias in isolated full-bridge topologies

    Publication Year: 2009 , Page(s): 100 - 103
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (511 KB) |  | HTML iconHTML  

    Isolated full-bridge topologies are used in some industrial applications due to its characteristic of cost-effective and high power density. However, the transformer used for isolation in such topologies can be easily saturated. In this paper, a control algorithm to suppress flux density bias in the transformer is proposed. The algorithm can be easily implemented into a low cost DSP. Details of the practical implementation of the proposed algorithm are shown. An example of application over a 3 kW single-stage power factor corrector is presented. The experimental results illustrate the feasibility of the proposed digital control solution. View full abstract»

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  • A simple current-balancing method for a three-phase 5-level current-source inverter

    Publication Year: 2009 , Page(s): 104 - 108
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB) |  | HTML iconHTML  

    Whether the intermediate inductor current can be kept balanced or not is vital to the output performance of multilevel current-source inverters (CSI's). This paper begins by introducing the operational principle of a three-phase 5-level CSI topology. In such a 5-level CSI system, control of the 1/2-level intermediate DC-link current is identified as a key problem. In order to keep the intermediate DC-link current well balanced, the mechanism of current balancing is analyzed in detail. By identifying the value of the inductor current and the positive-negative polarity of the voltage across the intermediate inductor, a simple implementation method for current balancing control is proposed on the basis of the carrier phase-shifted SPWM technique in this paper. Simulation and experimental prototypes have been built to verify this 5-level CSI system with the proposed current balancing control method. View full abstract»

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  • A single controller for inductive power transfer systems

    Publication Year: 2009 , Page(s): 109 - 113
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (450 KB) |  | HTML iconHTML  

    Contactless or inductive power transfer (IPT) is preferred for numerous applications, ranging from microwatt bio-engineering devices to high power battery charging systems. Typical IPT systems invariably require a separate controller on both powering and receiving sides of the system to facilitate contactless power transfer in an efficient and controllable way. This paper presents a new IPT control technique, which requires only a single controller located on the powering side to effectively control the amount of `contactless' power delivery to the receiving side. Both theoretical analysis and simulated results are presented to validate the viability of the proposed technique, which is unique in contrast to the existing IPT technology, and low in cost with only one controller. View full abstract»

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  • A single-phase active power filter based in a two stages grid-connected PV system

    Publication Year: 2009 , Page(s): 114 - 119
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1203 KB) |  | HTML iconHTML  

    In this work a single-phase active power filter based in a two stages grid-connected photovoltaic system is presented. The proposed system injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is unity independently of the solar radiation. In sunny days, the system processes all the reactive and active load power and the excessive power from the PV module can be fed to the utility. On the other hand, on cloudy days for instance, if the PV power is not enough, the system processes all the reactive load power and the shortage of active load power is supplemented by the utility. Besides, just using one current sensor, the control strategy is simple and of suitable for practical implementation. View full abstract»

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  • A single-phase UPS system with series-parallel power-line conditioning

    Publication Year: 2009 , Page(s): 120 - 125
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB) |  | HTML iconHTML  

    This work proposes a control strategy applied to a single-phase uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, allowing sinusoidal input current and sinusoidal output voltage, which results in an effective power factor correction. The UPS system is composed of two single-phase PWM converters to perform the active power line filter functions. The series converter acts as a series active power filter, becoming a sinusoidal current source in phase with the input voltage. The parallel converter acts as a parallel active power filter, becoming a sinusoidal voltage source in phase with the input voltage, which provides sinusoidal voltage with low total harmonic distortion (THD). The detection of the phase-angle is performed using a single-phase phase-locked loop (PLL) structure, which is based on instantaneous active power theory. The PLL system will be implemented into a two-phase stationary reference frame. Accordingly, a fictitious quadrature voltage needs to be generated, which must be orthogonal to the measured utility voltage. Both the control algorithm of the UPS system, which uses the synchronous reference frame (SRF) method, and the active power, which flows through the UPS converters, will be described and analytically studied. Mathematical analysis of the SRF-based algorithm is presented and simulation results are performed to validate the theoretical development and confirm the performance of the UPS system. View full abstract»

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  • A supercapacitor technique for efficiency improvement in linear regulators

    Publication Year: 2009 , Page(s): 132 - 135
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (694 KB) |  | HTML iconHTML  

    Paper describes a novel supercapacitor based approach to recover the wasted energy in linear regulators. In this US patent pending technique, a single supercapacitor or an array of supercapacitors could be coupled with a linear series or shunt regulator, where the supercapacitors are charged by the input current of the regulator. This supercapacitor technique, by maintaining the dropout voltage limit before a new capacitor is placed in the series path, recovers the energy and does not use the supercapacitors for voltage conversion. Average efficiency of the overall circuit is improved by a significant amount, while maintaining the useful hall marks of a linear regulator. An example of a 12 to 5 volt proof of concept circuit is detailed with an overall efficiency improvement from 42% to over 78%. The technique is versatile, and, can be developed further to compete with the higher efficiency switching power supplies. View full abstract»

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  • A SVPWM/SHEPWM combined modulation strategy of starting inverter for a high speed generator power system

    Publication Year: 2009 , Page(s): 136 - 141
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB) |  | HTML iconHTML  

    Recently more attention has been paid to the distributed power systems due to their high flexibility and reliability. The high speed permanent magnet (PM) generator driven by micro-turbine has been widely investigated since it has small size, high efficiency and power density. Since the micro-turbine cannot be self started, the PM generator has to operate as a motor for the system staring, which needs an inverter to drive the PM motor. The normal DC/AC conversion through normal inverter will generate harmonic currents in the generator winding which will cause additional loss and increase temperature rise of the generator. To reduce the current harmonics of high speed generator, a SVPWM and SHEPWM combined modulation strategy is adopted. Small signal model is analyzed and transfer function matrix is deduced. The structure and control strategy of a combined PWM inverter is introduced in this paper. The simulation and experimental results show the feasibility of the proposed design and control strategy. View full abstract»

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