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This paper presents the hypersynchronous converter cascade with intermediate DC-link scheme and one of the easiest and most reliable ways to control valves dependent on the rotary transducer rotor flux current. The equations explaining the regulation principle and the basic expression for calculating the hypersynchronous converter cascade static characteristics are presented. The design and control...
A multiple three-phase machine can be symmetrical or asymmetrical, depending on the phase displacement between the three-phase stator winding sets. This paper investigates the optimal phase displacement to minimize the output current ripple of nine-phase PWM inverters. The output current can be separated into current components that produce air gap flux and current components that produce copper losses...
In this paper a new coil design has been proposed, called as Quad D Quadrature (QDQ), in order to keep the maximum flux linkage between wireless charging system (WCS) coils even with reasonable misalignment. The proposed coils use their inherent five flux linkage loops at zero misalignment and three loops when encountered 50% misalignment between coils. The careful selection of optimized parameters...
We discuss current funnel control for synchronous machines (SMs) which assures current reference tracking with prescribed transient accuracy without the knowledge of system parameters and the (nonlinear) flux linkage. We present a generic (nonlinear) model of SMs and a simplified actuator model of the voltage source inverter. The dynamics describe a two-input two-output system with positive definite...
A neuron-MOS-based dynamic circuit scheme with two-phase clocks for realizing voltage-mode quaternary logic, is proposed. The dynamic quaternary inverter and literal circuits are designed, and the standard CMOS process with a 2-ploy layer is adopted without any modification of the thresholds. In the proposed circuits, the problem of floating output nodes is solved. The proposed circuits have some...
Hybrid power filter (HPF) is used as a low-cost solution to provide reactive power compensation in distribution systems. It can provide reactive power compensation with a very low operational voltage. Direct current tracking with hysteresis PWM is widely used for controlling the HPF. However, hysteresis PWM suffers from variable switching frequency and high current ripple. Droop control is able to...
This paper introduces a mathematical model and a voltage/frequency control scheme for inverter interfacing Grid Forming DG (VF) unit. The introduced control scheme utilizes the well understood and optimized dq-frame current control scheme that is used with inverter interfacing Grid Following DG (PQ) units. Minimum modifications are made to the control software to allow grid isolation operation of...
Recently Wireless Power Transfer (WPT) is widely studied in order to efficiently feed many different kinds of loads through a large air gap and loosely coupled transformer. The transformer presents large leakage inductances, resulting in poor voltage regulation against load variation. Moreover, the low magnetizing inductance, results in high magnetizing currents, reducing the overall efficiency. In...
Dual-buck circuit has higher reliability as it overcomes the straight-leg problem existing in the traditional bridge circuit. However, more magnetic components are needed in this topology, especially in three-phase dual buck inverter. Magnetic integration is a good way to reduce the volume and weight of the magnetic components and improve the density of the system. The coupled-inductor dual-buck circuit...
This paper applies deadbeat-direct torque and flux control (DB-DTFC) to minimize machine and inverter losses in synchronous reluctance drives each single switching period. Flux linkage-based loss models for machine and inverter considering nonlinear effects such as cross-saturation and temperature changes are experimentally evaluated. Loss minimizing capabilities are demonstrated comparing three different...
This paper presents a balanced-to-unbalanced (balun) with bandpass responses. Two ±K-inverters are utilized to replace the quarter-wavelength transmission lines or three quarter-wavelength lines in the conventional balun. The ±Kinverters consist of two half wavelength resonators, which can function as two filtering network. To connect the ±K-inverters in parallel, a filtering balun is realized. Theoretical...
This paper shows the design, mounting and operation of a power generation unit coupled to a spinning bicycle. The pilot allows two operation modes, stand-alone and grid-tied. Taking account of the price, this system could be interesting to reduce energy consumption in fitness centers where many spinning bicycles are constantly used during the day.
For development of inductive coupled wireless power transfer (WPT) systems, it is important to consider the overall efficiency of the WPT systems, where the overall efficiency is expressed as the product of the transmission efficiency of coupling coils and the power-conversion efficiency of power converters. Additionally, there are mutual dependencies between coupling coil parameters and power-converter...
In this paper, a highly efficient drive system for constant rotational speed applications, including a doubly fed permanent magnet synchronous machine (DFPMSM), will be presented. Due to loss minimization, most of the stator windings of the DFPMSM are directly fed by the electrical grid, while only some of the stator windings are fed by a low-power inverter to stabilize the complete drive system.
This paper discusses various transient trajectories for increasing the magnetization state (MS) of variable flux permanent magnet synchronous machines (VF-PMSMs), a class of PMSM where the magnets are demagnetized and remagnetized using the drive inverter during drive cycle operation. To manipulate MS, a magnetizing current pulse can be used, which may drive a large amount of flux linkage in the machine...
Wireless power transmission (WPT) using magnetic resonance has been attracting increasing attention from power electronics engineers and industry. A number of studies have investigated WPT circuits based on magnetic resonance and have verified the high-efficiency power transmission characteristics of such circuits. However, a 10-MHz-class high-frequency power supply suitable for high-power transmission...
This paper examines high speed performance of a permanent magnet (PM) machine with a reconfigurable winding (RW). First, the variations of machine parameters due to winding reconfiguration are presented and their impacts on drive system performance are investigated. To further understand system behavior, the reconfigurable ratio is set as a variable, and its effect on saliency ratio, flux weakening...
The combination of coupled inductors (CIs) and LCL filters can be a filter configuration to achieve high power density for high current applications. Frequency characteristics (i.e., resonance phenomenon) are changed according to the filter configuration and feedback currents (i.e., inverter-side or grid-side current) for current control loops. Therefore, stability analysis should be performed to...
The capacitive-coupling grid-connected inverter (CGCI) is able to achieve reactive power compensation and active power transfer simultaneously with a low operational voltage. The CGCI is coupled to the point of common coupling (PCC) via a second-order LC circuit, which makes its modeling and current control characteristics differs from the conventional inductive-coupling grid-connected inverter. The...
This paper discusses the dynamic interaction of multi-paralleled inverters within a weak grid. Interactive current and common current models are proposed to explain the interaction among these inverters, which are studied with both open loop and closed loop analysis. An aggregated model is proposed to describe the totality of multi-inverters. Additionally, system stability is explicitly studied and...
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