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The Modular Multilevel Converter (M2C) has become the preferred topology for use in high power applications in recent years. This paper gives guiding information for M2C design, in terms of carrier-based PWM methods. Phase and level shift methods are considered. The enhancement due to zero sequence signal injection is also quantified. It is found that output voltage characteristics are highly dependent...
This paper presents a modified DTC-PWM scheme which uses 12-side sectors and 12 voltage vectors to reduce torque and flux ripple. In the proposed control scheme, three voltage vectors can be selected in a sector with the torque and flux error conditions. The 3 voltage vectors are set as big-small, medium-medium and small-big pairs of torque and flux component according to the sign of the torque and...
This paper presents a modular push-pull PWM converter (MPC) for a battery energy storage system, which is intended for grid connections to medium- or high-voltage power systems. The converter per phase consists of a center-tapped transformer and two arms based on a cascade connection of multiple bidirectional PWM chopper cells with floating dc capacitors. This paper proposes a new control method for...
This paper presents a new circuit topology of active edge resonant snubbers assisted half-bridge soft switching PWM inverter type high power dc-dc converter for photovoltaic applications. The proposed step-up DC/DC converters with transformer isolation can obtain high voltage step-up trough turns ratio. The proposed dc-dc power converter is composed of typical voltage source-fed half-bridge high frequency...
In order to prevent the failure of regeneration and reduce energy consumption, making full use of regenerative energy has been widely recognized as an important issue by Chinese urban railway transportation community. This paper provides an overview on the technologies of regenerative energy braking in China. It is first explained that why the ground resistor is popular in China in order to prevent...
The contactless power transformer systems (CPTs) have recently attracted much attention as it is possible to supply electrical energy to mobile vehicles without cables. 300kW class CPT systems are required for railway vehicles power feeding applications. In this power range, there are some technical problems such as higher reactive power due to longer gap and power control at the misalignment of ground...
Technology development has been promoted aiming for an environment-friendly traction power supply system for railways. Among other things, a stationary energy storage system using lithium ion batteries for hybrid cars has been put into practical use since 2007. This device temporarily stores regenerative power generated from an train when it is stopped and the power is able to be applied for energy...
This paper proposes a new power flow controller consisting of six multilevel cascaded converters for stabilizing and regulating the line voltages in distribution networks. Each cascaded converter is composed of series connection of H-bridge converters, and connected between one phase in the sending end and the other phase in receiving end. While each cascaded converter control only reactive power...
This paper examines the control performance of a permanent magnet synchronous motor drive system based on direct torque control (DTC) using a SiC-MOSFET inverter (SiC inverter). The dead-time of the inverter affects the performance of the motor control. In high-speed drives, the dead-time effect increases because the control period becomes shorter. By using a SiC inverter for which the switching speed...
Servo system is greatly influenced by mechanical resonance. The offline suppression of mechanical resonance is determined by the identification of mechanical resonance characteristic. The resonance characteristic can be obtained from the Bode diagram of current closed-loop. This paper discusses two methods of fast acquirement to get resonant characteristic based on pseudo random binary sequence (PRBS)...
This paper shows the transient behavior of a system which boosts a part of the battery voltage for a electric vehicle. This system consists of the powertrain of electric vehicles and a bi-directional isolated DC-DC converter called dual active bridge (DAB). This system can compensate the battery voltage drops with high efficiency compared with the conventional series chopper system. In many studies,...
This paper presents a division-summation (D-Σ) digital control for a three-phase bi-directional photovoltaic inverter with wide inductance variation. The bi-directional inverter fulfilling grid connection and rectification with power factor correction has been implemented in the laboratory. The proposed D-Σ approach summarizes the inductor-current variations over one switching cycle to derive control...
This paper describes expected effects and characteristics required for next-generation power devices to be used in home appliances and consumer electronics. This paper focuses on the challenges presented by the IH cooking heater, energy storage systems, and solar power generation system and presents the circuits that will solve these challenges. Also, requirements for power devices used for the circuits...
This paper presents an input switched multilevel inverter topology for controlling a three-phase open-end winding induction motor drive. In this topology, DC link voltage obtained from a single voltage source is divided into ‘n’ equal steps, and a single pole multi-throw (SPMT) configuration is used to select any desired voltage level from these possible ‘n’ voltage levels. This is followed by H-bridge...
In this paper, a novel offset-based two-level pulse width modulation (PWM) scheme for a multilevel inverter with unbalanced dc sources is presented. The offset voltage is introduced as an indispensable variable in the control model for a multilevel voltage source inverter. An expression for the inverter parameters in abc coordinates can enable the determination of the operating ranges of related voltages...
This paper presents a novel single-phase inverter with a buck-boost-type power decoupling function suitable for PV generation. The proposed buck-boost-type power decoupling circuit enables the reduction of the peak voltage at the DC bus of the PWM inverter. This enables the use of switching devices with lower voltage ratings, and the resultant switching loss and conduction loss of the PWM inverter...
The aim of this paper is to present static and dynamic analyses of digital peak current mode dc-dc converter. The current detection circuit of the proposed method consists of RC integrator and comparator as the AD converter. The proposed method can detect the peak current in real time. Analyses and the transient response of proposed method are discussed in this paper. As a result, the convergence...
Three-level boost PFC converter has advantages of lower inductor current ripple and lower switch withstanding voltage than the boost PFC converter. Interleaved current sensorless control (ICSC) had been proposed for multiphase boost PFC converters. In this paper, ICSC is modified for current sensorless control of the three-level boost PFC converter with the asymmetric loads. The modified interleaved...
Photovoltaic (PV) inverters autonomously adjust their DC-link voltages to maximize power generation. Around sunrise or sunset, a PV inverter may operate at much lower DC-link voltage than the nominal level due to the low irradiance. The inverter would be under over-modulation if the DC-link voltage is relatively low to the grid voltage at the point of common coupling. In this paper, a series of implementation...
A photovoltaic (PV) string comprising multiple modules/sub-modules connected in series is well known to suffer from partial shading issues, such as decreased power generation and the occurrence of multiple power-point maxima. Although various kinds of differential power processing converters and voltage equalizers that can preclude partial-shading issues have been proposed, increases in circuit and...
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