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A pattern matching method for position sensorless control of IPMSMs having non-sinusoidal inductance spatial distribution in standstill and very low speed region has been proposed. In the proposed method, the rotor position is estimated by comparing the phase current derivatives measured in a real-time with those in advanced. The current derivatives are obtained by measuring the phase currents twice...
The controller design of servo drives for bandwidth improvement will presented in this paper. The delay issues caused by calculation, fdter and PWM generation, etc. are addressed. The controllers of current loop, speed loop and position loop are designed considering the delay and phase margin. Experimental results show the bandwidth for current, speed and position loops of servo drives are significantly...
In this paper, an improved control strategy for three-phase inverter is proposed, which ensures three-phase output voltage symmetry under unbalanced grid voltage. Firstly, the positive and negative sequence separation module is used to obtain unbalance output voltage and current during the grid faults. By calculating output power of the inverter, an improved P-ƒ, Q-U and Q-G droop control strategy...
This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised...
Conventional 12-pulse diode rectifiers have advantages such as: simplicity, high reliability, and low DC bus voltage ripple; however, they also result in some disadvantages including harmonic current and the lack of re-generation capability. Therefore, this study proposes an auxiliary converter (AXC) for 12-pulse diode rectifiers to mitigate the harmonic current and provide re-generation capability...
This paper introduces a digital PWM control of the KY step-up converter based on sigma-delta modulator, in which the mathematical modeling of the KY step-up converter and sigma-delta modulator are deduced. Then the digital control of KY converter with sigma-delta modulator, integrator and dumper, and digital to duty cycle converter has been successfully built in MATLAB Simulink to verify the idea...
The PWM half-bridge zeta (HBZ) converter is one of the most attractive dc-dc converters for wide-input-voltage applications due to its extended duty ratio above 0.5 and soft switching capability. However, it suffers from large peak current stress in the primary and secondary devices. To relieve these drawbacks, a PWM resonant HBZ converter is proposed. The proposed converter can effectively reduce...
In this paper, a DC power supply for wide input-voltage range and multi output, which is applied to both 200-V and 400-V power sources, is proposed. This power supply consists of a flying-capacitor three-level PFC and a LLC resonant three-level DC/DC converter. In the PFC, the circuit topology enables to use 600-V devices, minimize the detection circuit and the gate drive circuit, and reduce the size...
Grid-connected voltage source converters are widely used in various applications. In these Grid-connected converters, volume of the passive components such as AC side inductors and harmonic filters becomes sometimes a practical problem. As a solution to reduce the volume of the passive components in the grid-connected converters, flying capacitor multilevel converters are expected. The multilevel...
A zero-voltage switching (ZVS) pulse-width-modulation (PWM) single-phase inverter using a ZVS transformer-isolated step-up/down dc link is presented in this paper. The proposed ZVS transformer-isolated step-up/down dc link not only makes the switches in single-phase inverter can operate at ZVS condition, but it has a step-up/down input voltage function and it provides an isolation function. Moreover,...
This paper proposes the design of maximum power point tracking based on fuzzy logic control for standalone PV system. A complete model of the fuzzy logic maximum power point tracking for standalone PV system is compiled and loaded on the eMEGAsim using the RT-Lab real-time simulation platform from Opal-RT. The effectiveness of the proposed fuzzy logic control has been compared with the perturbation...
This paper addresses compensation performance of the constant dc-capacitor voltage-control (CDCVC)-based strategy for smart charger with the previously proposed reactive power control algorithm in single-phase three-wire distribution feeders (SPTWDFs) under distorted source voltage conditions. The instantaneous power flows into the smart charger is discussed in detail. This instantaneous power flowing...
State-of-the-art high power density AC/DC and DC/AC converter systems typically employ Triangular Current Mode (TCM) modulation or conventional PWM. TCM is characterized by a wide variation of switching frequency over the mains period and ensures soft-switching in all operating points, but results in increased conduction and high-frequency losses due to the necessary large current ripple. In contrast,...
Network technology realizes ultra high speed digital data transmission system. FPGA based hardware controller can utilize this technology in the power electronics fields. Nano seconds order data transmission can be realized. In this paper, Rocket I/O protocol was applied to the FPGA based hardware controller, the network based high speed feedback implementation can be realized. 1MHz multi sampling...
In this paper, a novel hybrid maximum power point tracking (MPPT) method under partially shaded conditions (PSC) is proposed. The duty cycle of the dc-dc converter is controlled from small to large with fixed intervals in order to scan the P-V characteristics curve under partially shaded conditions, and then find out the maximum power value, which is called duty sweep (DS) algorithm in this thesis...
This paper proposes a novel hybrid modulation technique for 3-phase dual-stage bidirectional inverter to achieve electrolytic capacitor-less design for the fuel cell vehicles (FCVs) propelling system. The 3-phase bidirectional inverter consists of front-end naturally clamped current-fed dual-active-bridge dc/dc converter and back-end voltage-fed six switches 3-phase inverter. The front-end converter...
One of the commonly used approaches to avoid the short circuit of power devices for pulse-width-modulation (PWM) inverters is to add dead-time into the control signals. The drawback of this approach is that severe distortion in phase currents and output voltages may occur. This paper proposes an adaptive-linear-neuron based nonlinearity compensation strategy to cope with the disturbance voltage caused...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
A highly integrated monolithic isolated gate driver with on-chip transformer is proposed. The main idea is to have an on-chip high-frequency voltage controlled oscillator (VCO) to provide a GHz carrier. Therefore, the on-chip transformer size could be shrunken to dimensions less than 1 mm2. Two on-chip transformer test structures are presented with dimension of 1020 µm × 860 µm. The stacked transformer...
In view of a three-phase/level boost rectifier, the performance of VIENNA rectifier is affected by the neutral-point (NP) voltage unbalance and oscillation. A novel strategy of zero-sequence component injection to balance the neutral-point voltage and suppress oscillation for VIENNA rectifier is proposed in this paper. Based on the mathematical expressions of neutral-point voltage, a simplified carrier-based...
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