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A soft-switching single-phase unified power quality conditioner (UPQC) using simple resonant units is proposed in this paper. In the proposed UPQC, all main switches operate at zero-voltage-switching (ZVS) turn-on and all auxiliary switches operate at zero-current-switching (ZCS) turn-off. The proposed UPQC consists of a soft-switching series active power filter and a soft-switching shunt active power...
This paper develops an integration slidingmode controller (ISMC) for a full-bridge single-ended-primary-inductance converter (SEPIC) supplied to an inverter-fed AC motor drive. Configuration of the developed SEPIC-based system is that a full diode bridge connected AC-to-DC SEPIC converter with power factor correction (PFC) is built for stably supplying DC voltage to the inverter. Under this configuration,...
This paper proposes a general framework to design operation modes of decentralized controlled DC microgrids without communication links. Under this framework, power units of the DC microgrid are firstly classified into several types according to their physical features. Then, a utilization priority of different types of units is determined by certain economic index, in order to achieve good economic...
In this paper, we develop an energy management algorithm for charging and discharging plug-in electric vehicles (PEVs). The algorithm considers both user convenience and electricity market factors. A performance metric, called “user convenience”, is formulated to measure the effective coordination of PEV charging. As a response to the electricity market, we address an economic dispatch problem by...
This paper introduces a simple method to measure the output impedance of a three-phase grid-connected inverter in dq-domain. The impedance measurements are most often used for model verification purposes but they can be also utilized to study impedance-based interactions between three-phase converters and the utility grid. Therefore, the methods to model and measure three-phase impedances can provide...
Multi-MW wind power converter's reliability is a key issue for the whole wind power generation system. Due to wind power fluctuation, IGBT's handling power is fluctuating largely and rapidly, which will cause a large junction temperature variation of IGBT. Thermal stress is the main factor affecting IGBT's lifetime. In this paper, the adaptive thermal control is proposed to improve IGBT's lifetime...
This paper presents a modified version of direct instantaneous torque control (DITC) for minimizing torque ripple in switched reluctance motor (SRM). In DITC, it is observed that the phase current profiles and torque ripple characteristics depend on the turn-on instant. For current profiles with low RMS value, an overshoot in torque is observed during the commutation period, which increases the torque...
The objective of this project is elimination of electrolytic capacitor in LED driver in order to enhance the operating time. In this paper, a novel circuit of LED driver is proposed using neutral point type buck-boost converter incorporating valley fill circuit, which can reduce the capacitance of smoothing capacitor. Thus, film capacitor can replace electrolytic capacitor as the smoothing capacitor...
This paper proposes an improved modulated carrier control method for a continuous conduction mode (CCM) power factor correction (PFC) boost converter. The proposed method allows precise sinusoidal line current shaping for a boost PFC converter operating in CCM. This is accomplished by simply comparing the compensated modulated carrier signal with the switch current information, such that the current...
This paper proposes maximum torque per ampere (MTPA) control and the active damping control of mono inverter dual parallel (MIDP) permanent magnet synchronous motor (PMSM) drive system. MIDP motor drive system is one of the configurations for reducing the cost of the power conversion circuits. However, it is hard to apply the MIDP motor drive system to PMSMs due to the instability unlike the induction...
In this paper, a LED dimming circuit, together with the KY converter, is presented, which is controlled based on the field-programmable gate array (FPGA). By a given dimming command and the proposed maximum gate voltage detector, the voltage across the MOSFET in the linear current regulator can be reduced so as to upgrade the efficiency of the overall system. Aside from this, each LED string takes...
This paper investigates and presents a new phase locked loop (PLL) based on fast positive and negative sequence decomposition algorithm with matrix operation under distorted grid conditions. In renewable energy integration filed, some information of unbalanced and distorted grid voltages, such as frequency and phase angle of fundamental wave, should be exactly and quickly detected for reliable operation...
In this paper, a novel adaptive reduced-order observer is proposed for the position-sensorless drive of doubly-fed induction machines. The reduced-order observer is conducted by the reduced-order model expressed on the holonomic reference frame; the stator equation on stator reference frame. The proposed rotor-position estimation scheme is straightforward and simplicity for implementation without...
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