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For high power IGBTs in the AC motor drive and inverter applications, the reliable gate drive bias supply is critical to the robust performance of the system. This paper introduces the Fly-Buck DC/DC converter to generate isolated bias rails for the IGBT gate driver. Comparing to the traditional isolated switched power supply topologies, the Fly-Buck converter offers several advantages such as good...
This paper proposes a novel hybrid topology for double flying capacitor multicell (DFCM) converters that is suitable for grid-tied renewable energy systems. The proposed hybrid power converter is realized by the cascade connection of one DFCM power converter and one full-bridge converter (FBC) comprising floating-capacitor. Floating-capacitor voltage of the FBC is regulated naturally at its required...
A novel Zero Voltage Switching (ZVS) three-level NPC inverter topology using a new ZVS Space Vector Modulation (SVM) scheme is proposed. A detailed operation analysis of ZVS three-level NPC inverter is given. The ZVS condition of the proposed ZVS inverter is derived and it can be achieved of all switches in the proposed inverter, which include both the main switches and the auxiliary switches. The...
This paper introduces a 3500V, 15A SiC power module based on self-fabricated SiC junction field effect transistors (JFETs) and schottky barrier diodes (SBDs). The module consists of four parallel connected SiC JFETs as the switching device and four SBDs as the anti-parallel diode. Both static and dynamic performances are evaluated with this module. And a kW level boost converter is also constructed...
Annual Performance Factor (APF) requirements which calculate the annual electricity consumption have been applied to applications such as air conditioners necessitating reduction in the power consumption of the semiconductor switches in the inverter. A new Super Mini DIPIPM™ with Super Junction MOSFETs in parallel with the IGBTs has been developed to meet these lower annual power consumption requirements...
In this paper, a competitive three-phase buck-type PFC converter named SWISS Rectifier is comprehensively researched to inhibit mains current distortion. The control structure which would realize PFC function but also introduce harmonic components to mains current is illustrated and improved to achieve better performance. The origin of the mains current distortion occurred at the sector boundaries...
This paper analyzes the voltage-source-inverter parallel system as a multi-input & multi-output system, and proposes the circulating-current mathematical model, the steady-state model and small-signal model of parallel system. Then the phasor models of the circulating-current and the circulating-current power are proposed. Subsequently, the mathematical model of traditional droop control is built...
DC microgrids may have time-varying system structures and operation patterns due to the flexibility and uncertainty of microsources. This feature poses a challenge to conventional stability analysis methods, which are based on fixed and complete system models. To solve this problem, the concept of self-disciplined stabilization is introduced in this paper. A common stability discipline is established...
In an AC-DC hybrid bus nanogrid, a bidirectional converter is commonly used to transfer energy between the single-phase AC system and the DC system with stable operation and long lifetime. Therefore, the single-phase AC-DC converter should be designed to avoid using the short lifetime electrolytic capacitor. In this paper, a bidirectional single-phase AC-DC PWM converter using an additional line-level...
This paper analyzes the harmonic contents of a non-linear load connected to a two-phase microgrid system. Although having the same harmonic content as the single-phase power system when supplying a non-linear load under balanced conditions, the two-phase microgrid system presents the following advantages: 1) constant power through the power line at the balanced condition; 2) two voltages i.e., line-to-line...
Battery/Supercapacitor (SC) hybrid energy storage system (HESS) is widely researched due to the superiority of SC in high power density, high cycle capability, and long life time. The repetitive charge for HESS via Wireless Power Transfer (WPT) is a potential solution for reduction of battery size on board. For WPT charging, the load impedance control using DC-DC converter was proposed to improve...
This paper presents a three-phase four-wire shunt active power filter (APF) based on hybrid cascade H-bridge seven-level converter as its main circuit with star configuration. A new modulation method based on carrier disposition PWM (CD-PWM) is proposed for the converter which solves the power reverse problem effectively. In system control, DC-link total voltage control based on active current vector...
The popularity of highly resonant, loosely coupled, wireless energy transfer systems operating at 6.78 MHz has increased dramatically over the last few years. In this paper we present the zero voltage switching (ZVS) voltage mode class D amplifier topology and evaluate its performance as a suitable A4WP Class-3 compliant amplifier using eGaN FETs and compare the performance with MOSFETs. Experimental...
A wireless LLC charger using primary-side resonance to achieve magnetic inductive coupling with matrix core set (MCS) is proposed for power transfer to electric vehicle. The MCS consists of usual low cost ferrite core in matrix form, including transmitter MCS (TX MCS) and receiver MCS (RX MCS), in which both two MCSs are expected to be coupling close in proximity. Although the leakage inductance may...
This paper proposes an improved nearest-level modulation (NLM) method for the modular multilevel converter (MMC). By injecting an optimal common-mode voltage, the proposed method enables optimal capacitor-voltage balancing and circulating-current control of the MMC. A general approach to determine the optimal common-mode voltage is introduced in detail in this paper. In the proposed method, the level...
Practical implementations of the power electronics required to operate bearingless machines with so-called “dual purpose no voltage” (DPNV) windings are proposed. These windings enable a bearingless machine to use the same coils to produce both radial suspension forces and torque, which has been shown in the literature to enable better machine performance. In this paper, the use of two-level inverters...
Second harmonic pulsating power flows through the dc side of the single-phase quasi-Z-source inverter (qZSI). This requires bulky capacitor banks and inductors to suppress the second harmonic ripple of dc-link voltage and inductor currents. However, the resultant qZS network seriously deteriorates the system reliability, efficiency, volume, weight, and cost. This paper proposes an active filter integrated...
In order to prevent the power switching devices (e.g., the Insulated-Gate-Bipolar-Transistor, IGBT) from shoot-through in voltage source converter during a switching period, a dead time is added either in the hardware drivers of the IGBTs or implemented in the software Pulse-Width Modulation (PWM) scheme. Both methods will lead to a degradation of the injected current power quality. Thus, the harmonics...
The medium-voltage dc amplifier is a controllable dc source for the purpose of testing medium-voltage dc system technologies for shipboard applications. In a medium-voltage dc amplifier system, a dc active filter with a series dc coupling transformer is an integral component of the system required for both steady-state and dynamic voltage injection. This paper describes the design aspects and methodology...
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