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Predictive control is attracting more and more attention in the area of power converters and motor drives. Among various predictive control methods, finite control set model predictive control (FCSMPC) and direct current control (DCC) are two well-known approaches. FCSMPC is a powerful control method, because it takes the precise mathematical model into consideration and is easy to consider various...
This paper details efficiency optimized operation and design of a bi-directional and isolated five-level Dual Active Bridge (5LDAB) converter for an application that requires ultra-wide voltage and power ranges. The rated power of the considered converter is 7.5kW, the specified input voltage range is 150V ≤ Vdc1 ≤ 800V and the output voltage is constant, Vdc2 = 700V. In order to achieve high efficiency...
Vibrational energy harvesting is gaining more and more attentions recently due to increasing power demands for on-board and remote applications. Piezoelectric Zirconate Titanate (PZT) based cantilever structure is one of the popular forms for vibrational energy harvesting. However, due to its complex electromechanical characteristics, the energy harvesting still remains as a challenge. This paper...
This paper discusses a high-efficiency power supply developed for implementation under low-voltage and high-current conditions for sintering applications such as the Spark Plasma Sintering (SPS) and so on. The proposed system consists of four 2,500-A units of the power supply connected in parallel. The output voltage of the proposed system is very low because load resistance is usually very small...
This paper proposes a single-magnetic cell-to-cell battery equalization topology. This balancing method achieves energy transportation by fly-back operation and forward operation. Energy transfers directly from the highest voltage cell to the lowest voltage cell which is conductive to improving the balancing efficiency and speed. To confirm the performance of the proposed battery equalizer, stimulations...
The traditional EMI solutions do not directly face with the exact locations of the di/dt or dv/dt noise sources and their actual transmission pat, which results in the EMI solutions with their experience. The quick EMI solution proposed in the paper is based on the exact noise location and transmission path from the actual focused electric-magnetic field distribution in products. With further investigation...
Magnetic flux leakage transformer (MFLT) is widely used in the stable power supply of electronic equipment. For MFLT, whose characteristics become more complex and nonlinear for its leakage and load, the traditional circuit analysis method of transformer could not describe it accurately. In this paper, a nonlinear-transient field-circuit coupled finite element model is used to simulate the MFLT with...
A novel topology scheme for wireless power transfer (WPT) applications whose transmitter consists of dual opposite phase class E inverters was proposed. Series-series compensation topology was applied for magnetic coupling structure. Constant output voltage at secondary side can be easily realized by inserting a π transconductance at the output of inverter to ensure the primary currents to be constant...
The Aalborg Inverter is a new type of high efficient DC/AC grid-tied inverter, where the input DC voltage can vary in a wide range. Compared with the LCL-filter, the LLCL-filter can save the total inductance for the conventional voltage source inverter. In this paper, an LLCL-filter based Aalborg Inverter is proposed and its character is illustrated through the small signal analysis in both “Buck”...
There is discontinuous input current or output current in most of the isolated DC-DC converter. If continuous current is required, generally we need to add additional bulky filter, which will reduce the system's power density. In this paper, the method of adding a built-in filter to the isolated converter to achieve a continuous input current was employed. The built-in filter is composed of transformer...
This study presents a novel topology named high voltage-gain boost DC-DC converter with tapped-inductor. The proposed topology provides a high voltage-gain and low input current ripple which are suitable for alternative power sources such as PV and fuel-cell applications. The interleaved control mode can be used to reduce input and output filtering. Moreover, the voltage stress on MOSFETs are clamped,...
This paper presents the loss performance analysis of an isolated power supply that is designed for ultra-fast tracking converters. The results of the analysis provide insights into the operation of the proposed power supply, how each physical component contributes to the total loss, and how its efficiency may be further improved.
This paper briefly describes the concept of bi-directional DC/DC converter, it introduces the bi-directional DC/DC converter category, control technology and practical application. Bi-directional DC/DC converter is a vital component of the power electronic converter, in the case of two-way need energy flow, bi-directional DC/DC converter has important application value. As the development of science...
A novel direct torque control based on terminal sliding mode controller for doubly salient electro-magnetic machine was proposed in this paper. The mathematical model of the motor has been constructed and generation principle of torque ripple was analyzed. Based on analysis of torque ripple, phase current waveforms had been optimized to reduce the electro-magnetic torque ripple by using direct torque...
With the development of microgrid technologies, the impacts brought by distributed generation (DG) on the distribution network protection has not been improved effectively. Therefore, this article analyzed the fault characteristics of IBDG (inverter-based distributed generations) and that of microgrid composed by IBDG; built the simulation model of IBDG with P-Q control and that of IBDG with U-F control,...
The number of high voltage direct current transmission (HVDC) installations is growing rapidly nowadays, and network operators are working to define grid codes that regulate behaviors of HVDC system to operate under different conditions. This paper presents implementation of a small-scale HVDC lab prototype, which aims at studying the characteristics of the VSC-HVDC system and meeting the requirements...
Quasi-Z-source inverter (QZSI) can boost and buck the input voltage with only once power transformation. It is suitable for the grid-connected photovoltaic (PV) system with the wide variation of PV cells output. The composite control for PV grid-connected and energy-storage based on Quasi-Z-source inverter is researched in this paper. The energy balance between the pre-stage circuit and the post-stage...
Based on the characteristics of PV array model, static and dynamic mathematical models of the single-stage PV power grid-connected generation system under the condition of power control are established in this paper. The voltage trajectory of PV array is studied by means of phase diagram analysis, which provides the basis for designing the maximum power point tracking algorithm. A step-power tracking...
The purpose of this paper is to present the speed-sensorless weighted vector control method of parallel-connected dual induction motors fed by a single inverter. In this paper, the flux linkage of dual induction motors is reoriented, and then the control expressions of weighted rotor flux linkage and weighted torque of dual motors are derived. The weight value of vector control for dual induction...
The Piezoelectric Actuator Drive (PAD) is an accurate, high-torque rotary piezoelectric motor that employs piezoelectric stack actuators and inverse hypocycloidal motion to generate rotation. Important factors that determine motor performance are the proper concentric alignment between the motor ring and shaft and the similarity of the stack actuators used. This paper investigates the electromechanical...
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