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This paper presents a bi-directional converter with a buck/forward active clamp, which can be used in 360 V dc-link and 100 V battery of a dc generation PV system. This topology can achieve turn-on and turn-off zero-current-transition (ZCT). In buck operation mode, the converter is operated with synchronous rectification and with an active clamp, which is realized with a forward snubber. With this...
Many governments deploy ubiquitous IT project, which aims to combine the latest wireless network and wide-band technologies etc. to accomplish a ubiquitous wireless communication network. The ubiquitous wireless communication network can be utilized for the Advanced Metering Infrastructure (AMI). Therefore, this paper tries to use the new wireless communication technologies to design and implement...
In this paper, a new efficiency-optimized space-vector-modulation direct torque control (DTC) scheme is proposed and implemented for induction motor drives. Different from the traditional DTC, in which the flux linkage reference value is set as the rated value, the flux linkage reference value in the proposed DTC is online updated according to the instantaneous load torque and rotational speed by...
This paper explores the simulation technique of the harmonic current under phase angle control of a universal motor. The harmonic current generates the damage-by-fire accident of the transformer and phase advance capacitor, both of which are connected to an electric power system. This problem has warranted new standards imposed by the IEC. Comparatively, the universal motor for vacuum cleaners is...
This paper presents voltage stability in power systems when connected by wind farm generators. Two models of wind generator, namely squirrel cage induction generator and doubly fed induction generator are used and based on steady-state model. P-V curve is used to express maximum loading factor in power system when wind farm was installed. The test IEEE 14 bus system is selected to show proposed performance...
A new very high efficiency 10 kW isolated R4 boost converter for low-voltage high-power fuel cell applications is presented. Using a new concept for partially paralleling of isolated boost converters, only the critical high ac-current parts are paralleled. Four 2.5 kW power stages, consisting of full-bridge switching stages and power transformers, operate in parallel on primary side and in series...
This paper proposes an adaptive backstepping controller design for a position control system of permanent-magnet synchronous motors. The proposed system has been successfully used in a knitting machine with satisfactory performance, including fast transient responses, good steady-state responses, and good tracking ability. Based on properly selecting a Lyapunov function, an adaptive backstepping position...
This paper presents a fully integrated single-inductor dual-output (SIDO) buck-boost or boost-boost DC-DC converter with power-distributive control. This converter works under voltage mode control to have better noise immunity, uses fewer power switches/external compensation components to reduce cost, and is thus suitable for system on chip (SoC) applications. The proposed SIDO converter was fabricated...
Transverse flux machine (TFM) useful for in-wheel motor applications is presented. This transverse flux permanent magnet motor is designed to achieve high torque-to-weight ratio and is suitable for direct-drive wheel applications. As in conventional TFM, the phases are located under each other, which will increase the axial length of the machine. The idea of this design is to reduce the axial length...
This paper describes about how to utilize the industry standard critical conduction mode (CRM) boost interleaved power factor correction (PFC) control IC in a bridgeless environment. The proposed control technique is based on control signal diversion. It makes the bridgeless CRM boost interleaved PFC control signal looks like a conventional bridged-CRM boost interleaved PFC to the control IC. The...
The objective of this paper is to propose a simple emulator of variable speed wind turbine generator, which consists of two inverters control two squirrel cage induction motors. One acts as prime mover and other acts as variable speed generator. As prime mover, the manual speed command is used to simulate as close as possible of wind turbine. As generator, the variable speed self excited induction...
The repetitive control has been widely used in grid connected voltage source converters, such as uninterruptible power supplies (UPS), photovoltaic inverter (PV) and active power filter (APF). This paper introduces a new repetitive control strategy in the APF system; the proposed control strategy has a forgetting factor (FF), which could improve control system robustness. Control system stability...
This paper presents an analysis of a coupled inductor for zero-current transition (ZCT) converters. In order to reduce switching losses and noises, a soft-switching technique is adopted. It is suitable for the pulse-width modulation (PWM), because the resonant transition is very short and it is independent of the switching frequency. We adapt a coupled inductor which consists of a boost inductor and...
This paper analyzes the characteristic of singlephase converter system and establishes the active power and reactive power model in d-q axis, which is the same with the three-phase system in d-q axis and could employ decoupling feedback control for reactive compensation and active power control. For realizing d-q transformation in single-phase system, a new orthogonal decomposition method with sliding...
Performance investigations and drive designs of an interior permanent magnet (PM) machine, in both the constant torque and the flux-weakening operating regions, are generally conducted based on the machine parameters that are calculated from finite element analysis (FEA). To properly select the optimal current control angles for maximum torque generations at various speeds, this paper presents thorough...
This paper presents a method to improve the efficiency of a standard asymmetric half-bridge converter for 3 phase, 12/8 switched reluctance motor (SRM) drives at low speed operation. At that speed range, the SRM converter operates mainly in current chopping modes either hard chopping or soft chopping control. This work emphasizes on minimizing the main power losses during the turn-off interval of...
Using a conventional hysteresis current control for SRMs, the switching frequency varies dramatically and could exceed the limit of switching devices. This could lead to damages of switching devices and also reduce the reliability of the drive. To solve this problem, this paper proposes an additional adaptation in the conventional hysteresis current control for SRMs in order to keep the switching...
This paper discusses the importance of a simulation study of the Taiwan Electrical Fuel Cell Power Scooter. This study applies a more detailed modeling which is complex as existing modeling methods, yet not more difficult to solve numerically. In most simulation studies, the influence of non-linearity (for example, saturation, losses, reluctance effects) of the power electronics and electrical machine...
This paper proposes a multi-rating electronics ballast for fluorescent lamp using phase-locked loop control scheme. By this method, the resonant frequency of the circuit is continuously tracked. Compared with the previous Phase-locked loop (PLL) control of the electronic ballasts for fluorescent lamps, the proposed method can have resonant frequency tracked for the electronic ballasts, where the equivalent...
Digital controller platforms for power electronic converters have typically been based on a single high performance digital processor, often coupled with a programmable logic gate array. The digital processor is usually a digital signal processor (DSP). Often, a highly optimized real-time operating system provides multitasking features for the controller code execution on a single processor core....
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