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ABSTRACT: Studies show that the power cycling mean time to failure (MTTF) of the insulated-gate bipolar transistor (IGBT) bond wire in an adjustable speed drive may be very short under some very common conditions. This paper proposes a switching frequency reduction method based on the junction temperature variation (ΔT<sub>j</sub>) of an inverter IGBT. It has the following advantages. First, it reduces the pulsewidth-modulation frequency under low-speed higher torque condition. Second, the inverter is started more smoothly and safely under higher command switching frequency and high-torque condition. Third, the overall MTTF of the inverter IGBT can be improved. The theory analysis, simulation, and experimental result are provided to show these advantages.
IEEE Transactions on Industry Applications 05/2011; · 1.66 Impact Factor
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ABSTRACT: This paper analyzes the insulated gate bipolar transistor (IGBT) power cycling capability for a dual-bridge matrix converter (DBMC) used as a motor drive and compares the result with the traditional dc/ac inverter and the conventional matrix converter (CMC). Two pulsewidth modulation (PWM) control methods for the DBMC are investigated. One is called zero-current PWM (ZCPWM), which allows zero current commutation of the rectifier side switches. The other is named zero-voltage PWM (ZVPWM), which generates zero-voltage switching in the inverter IGBT. It is found that the DBMC under the ZVPWM method shows much higher power cycling capabilities in the IGBT than that of the ZCPWM and the other two topologies. Moreover, by appropriately selecting the sequence of the ZVPWM and ZCPWM methods, the DBMC shows overall advantages on the sizing of the IGBT and the balancing of the thermal system. It is also shown that the IGBT applied in the DBMC inverter is easier to operate under higher switching frequency conditions.
IEEE Transactions on Industry Applications 01/2011; · 1.66 Impact Factor
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ABSTRACT: This paper analyzes the IGBT power cycling capability for dual bridge matrix converter (DBMC) used as a motor drive and compares the result with the traditional DC/AC inverter and the conventional matrix converter (CMC). Two PWM control methods for the DBMC are investigated. One is called zero current switching PWM (ZCPWM) that allows zero current commutation of the rectifier side switches. The other is named zero voltage switching (ZVPWM) that generates zero voltage switching in the inverter IGBT. It is found that the DBMC under ZVPWM method shows overall advantages in the IGBT power cycling capability over ZCPWM and the other two topologies. Moreover, by appropriately select the sequence of ZVPWM and ZCPWM method, the DBMC shows advantages on sizing of the IGBT, balancing of the thermal system and easier to operate under higher switching frequency conditions.
Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE; 10/2009
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ABSTRACT: This paper analyzes the power-cycling capability of insulated-gate bipolar transistor (IGBT) modules in a conventional matrix converter used as a motor drive. The analysis is made under various conditions for this topology, including low-speed-operation capability, high-speed thermal- and power-cycling capabilities, etc. It was found that the power-cycling mean time to failure of IGBT in a matrix converter is low when the input and output frequencies are close to each other or when the output frequency of the converter is low. As a result, the chip size of the conventional matrix converter may be larger than the other candidates. In the end of this paper, some guidance for designing a matrix converter for long-term reliabilities is also discussed.
IEEE Transactions on Industry Applications 09/2009; · 1.66 Impact Factor
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ABSTRACT: This paper analyzes the power cycling capability of semiconductor under various conditions for adjustable speed drive (ASD). An analysis is made that calculates the mean time to failure (MTTF) of the semiconductor under various conditions, including low speed operation capability, high speed thermal capability and overload capability. After that, the MTTF estimations of the IGBT under different heatsink design and different drive ratings are studied. This paper will show that the MTTF of the inverter may be very short under some very common operating conditions. Thus, it is prudent to size the drive properly in order to avoid earlier failure.
Industry Applications Society Annual Meeting, 2008. IAS '08. IEEE; 11/2008
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ABSTRACT: This paper evaluates the optimal design of the main inductor for LCL filter in a three phase active front end (AFE) rectifier. The objective is to evaluate the optimal inductance of the main inductance and its cost under various switching frequency, air flow speed, and inductance. The paper presents a detailed step by step optimization procedure to optimize main inductor with lamination materials. Then, the optimized designs under various conditions are compared and evaluated. In the end, one optimal sample is built up and tested to prove the effectiveness of the design concept.
Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE; 10/2007
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ABSTRACT: This paper develops a thermal model for a six-pack insulated gate bipolar transistor (IGBT) power module operating as a three phase voltage source inverter. With this model, the temperature of each chip can be derived directly from the losses of the silicon chips and a thermal impedance matrix. The losses of each chip can be calculated through the voltage and current information of the power module. The impedance model can be easily transferred into a micro-processor to predict the online chip temperatures. It largely increases the temperature accuracy when the inverter operates at zero or low output frequency. Theory analysis, simulation and experimental results are provided to verify the effectiveness of this model
Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE; 11/2006
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ABSTRACT: This paper investigates the performance of a dual-bridge matrix converter (DBMC) operating with distorted source voltages. A direct feed-forward unbalance control scheme is developed to reduce the influence of input voltage distortion to the load. The line side source voltages and its fundamental component are first detected. Then, appropriate distorted switching functions of the line side converter are applied to reduce the harmonic content of the load. The proposed method has several advantages: first, it can effectively reduce the harmonic content of the load side current with either unbalanced or distorted source voltage. Second, this control method requires only calculation of the fundamental components of the input line voltages. Third, the input power factor of the fundamental component can be adjusted readily without any difficulty. Lastly, the harmonic content of the line side current can also be easily approximated. Theoretical analysis and simulation results are presented in the paper to verify the effectiveness of the approach.
Industrial Electronics Society, 2003. IECON '03. The 29th Annual Conference of the IEEE; 12/2003
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ABSTRACT: The dual-bridge matrix converter (DBMC) concept has been gaining recognition as a promising circuit alternative. Among all the DBMC topologies with reduced number of switches, the 9-switch topology shows the least number of switches and high quality waveforms. However, it has been proven that this converter can not operate safely when the output power factor is less than 0.866. This paper proposes a novel method to operate the 9-switch DBMC with low output power factor loads. In order to accomplish this task, one additional clamp circuit switch is introduced to exchange power when the output power factor is lower than 0.866. With this switch, the 9-switch DBMC can continue to provide high quality input/output waveforms when the output power factor, is not too low. Theoretical analysis, simulation and experimental results are presented in the paper to verify its effectiveness.
Industry Applications Conference, 2003. 38th IAS Annual Meeting. Conference Record of the; 11/2003
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ABSTRACT: The three-phase AC-AC converter termed the matrix converter can provide high quality input/output waveforms and adjustable input power factor without any large energy storage component. However, it has not yet found much acceptance in industry. The main reason is that it requires a complicated commutation scheme to prevent input side short circuits and output side open circuits. This paper develops a new voltage commutation scheme for the conventional matrix converter. One advantage of this scheme is that it provides robust voltage commutations for the converter without sacrificing the quality of the line side current waveforms. The second advantage is that it needs the least information from the system than any algorithm yet reported. It only detects the line side synchronization angle which can have detection errors within ±π/6 radians under unity input power factor to provide accurate commutation. The last advantage of this scheme is that it can provide easier shut down sequences for the system. Theoretical analysis, simulation and experimental results are provided to verify its effectiveness in the paper.
Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual; 07/2003
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ABSTRACT: A direct AC-to-AC converter commonly termed a matrix converter has a simple structure and many attractive features. However, the complexity of its conventional PWM strategy is prone to commutation failure, which is a factor that keeps it from being utilized in industry. This paper focuses on several alternative dual-bridge matrix topologies which do not possess this problem. First, these converters have the same characteristics as a conventional matrix converter, such as four-quadrant operation, unity input power factor, no DC-link capacitor, and high quality voltage/current waveforms. Second, the number of switches can be reduced thus reducing the cost. Third, the switches on the line side can turn on and off at zero current, they do not have any difficult commutation problems. Lastly, the complexity of the clamp circuit in these topologies can be greatly simplified thereby further reducing the cost. This paper introduces several topologies with a reduced number of switches and analyzes the characteristics of this converter family. Simulation and experimental results of a 9-switch topology are provided to verify its feasibility.
Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual; 02/2002
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ABSTRACT: In this paper, a novel space-vector PWM control method of
three-level converter is proposed. The effect of the motor's phase
current to DC voltage balance is analyzed in detail. After that, a new
DC-voltage balance method is carried out. Compared to the conventional
one, this method can adjust the DC voltage under all kinds of loads. At
last, it is verified by experimental results
Power Electronics and Drive Systems, 1999. PEDS '99. Proceedings of the IEEE 1999 International Conference on; 02/1999
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ABSTRACT: In this paper, an equivalent circuit of a three-level converter is
proposed. By applying this equivalent circuit into a dual-PWM
three-level converter system, a new direct power feedback method is
obtained. Compared to the conventional control method, the direct power
feedback scheme has the following merits: fast dynamic response from the
rectifier to the inverter, DC voltage is more stable under dynamic
state. Simulation results verified the feasibility and usefulness of
this new control method
Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE; 02/1999
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ABSTRACT: This paper presents a novel method to improve the performance of speed sensorless vector control system. This method is based on the conventional method that uses feedback of q-axis flux to obtain estimated speed. To improve the dynamic performance of speed estimation, the feedforward item of estimated speed is added. Because q-axis rotor flux is controlled nearly to zero in this method, the equation for feedforward speed calculation can be obtained easily and exactly. Compared with former method, this new method has better dynamic characteristics. The effectiveness is verified by digital simulation
Industrial Electronics Society, 1998. IECON '98. Proceedings of the 24th Annual Conference of the IEEE;
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ABSTRACT: This paper presents a dual PWM method for the three-level IGBT
converter to drive an induction motor. A VMEbus based multi-CPU hardware
platform is depicted in detail. This structure has the following merits:
high performance in industry application, flexible control, easy to
handle different traction system with the single bus. By applying the
space vector control method to dual-PWM three-level converter system, we
can minimize both input and output current harmonics, get unity input
power factor and retain the DC link voltage balance. The principle of
the proposed PWM method and the control method of flux orientation are
discussed in detail. Computer simulation results verified the former
method on a prototype of one three-level IGBT system with 5 kHz
Industrial Electronics Society, 1998. IECON '98. Proceedings of the 24th Annual Conference of the IEEE;
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ABSTRACT: Field-oriented control has emerged as an important approach to the control of induction motors, and rotor flux estimation from the terminal variables is a key step in most popular implementations of such a system. Based on the analysis of disturbance and parameter variations of a vector controlled induction motor system driven by a three-level inverter, a reduced order flux observer is presented according to the H/spl infin/ theory, which can minimize the estimation error. Simulation and experimental results are given which show that this flux observer gives better performance during steady state and transient process than the traditional current-based and voltage-based method. It is more robust against parameter variations and converges faster.
Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE;
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ABSTRACT: The dual bridge matrix converter can create high quality input/output waveforms as the normal double bridge converter with less switches, simpler clamp circuit and easier control. Moreover, it can also operate with a common bus-multiple inverter fed load condition. As a result, a more flexible and compact design can be made with this topology. This paper investigates the operation of a dual-bridge matrix converter (DBMC) under the boost mode. The converter operates at several hundred hertz fundamental frequency at both the input and two output sides. The high frequency operation at both sides further reduces the size and the weight of the system. Finally, theory analysis and simulation results are presented in the paper to verify its effectiveness.
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ABSTRACT: This paper describes a real time simulator of matrix converter system. The simulated plant is a classical matrix converter with source, input filter and load. The simulator is based on the RT-LAB real time simulation platform, which enables easy model-to-target designs from Simulink models. The simulator is designed to accept real IGBT/GTO/MOSFET firing pulses from high performance I/Os thus permitting matrix converter controller testing in hardware-in-the-loop (HIL) simulations. The matrix converter models use interpolation methods to obtain variable step-solver equivalent precision in the fixed time step scheme required by HIL applications. This paper highlights the special techniques necessary to simulate kHz-range inverters
Power Electronics and Applications, 2005 European Conference on;
