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PSPICE Modeling and Simulation of IGBT Based Resonant Commutation Converter
M.Akherraz,IEEE Senior Member 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper presents a PSPICE simulation of an, experimentally tested, IGBT based 24-Khz-DC-DC resonant commutation converter. The DC-AC conversion is done via an IGBT bridge and the AC-DC conversion is accomplished by a high frequency ac link followed by a fast diode bridge. The ac link consists of snubbing capacitors and a variable air-gap transformer, which are designed to fulfill Zero Voltage Commutation requirement. The proposed converter is simulated using PSPICE and the obtained results are compared to experimental results with discussion and comments.
Analysis of Carrier PWM Algorithms For Three Phase Four Wire Multi-level Inverter
Nguyen Van Nho,Myung Joong Youn,IEEE Senior Member 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents a simple PWM method to control three phase four leg multilevel inverters, which have been developed for supplying electrical power to three phase unbalanced load and for related power active filters. The method is derived from a general correlation between space vector PWM (SVPWM) method and carrier based PWM (CPWM) method. As an advantage, the simplicity and flexibility of the proposed CPWM control can be obtained and the complicated calculations of the 3-D SVPWM concepts can be avoided. The method has been mathematical formulated and demonstrated by simulation results.
Analysis and Control of an MMC-HVDC System Under an Unbalanced Grid Condition
Kim Tuan Luu,Minxiao HAN,Senior Member, IEEE,Xiaojun Tang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
Modular multilevel converter (MMC)-based high voltage direct current (HVDC) systems have been increasingly researched and installed in recent years. During operation, systems may be subjected to various unbalanced conditions, the single-line to ground (SLG) fault is one of the most common unbalanced faults. When a SLG fault occurs in a three-phase alternating current (AC) system, the double-line frequency positive- and zero-sequence harmonic components will be produced besides the double-line frequency negative-sequence harmonic component. And if the control system cannot suppress these harmonic components, they can propagate into the direct current (DC) side of the HVDC system and cause ripples in DC-line voltage and current as well as other unwanted consequences. Among the proposed controllers in the published papers on this topic, rarely controllers can both eff ectively suppress the circulating current and completely eliminate ripples in the DC-line voltage and current while still keeping the AC-side current balanced under unbalanced grid conditions. Therefore, this paper fi rst analyses the propagation of harmonic components in a two-terminal MMC-HVDC system under a SLG fault. Then, based on the mathematical analysis, a proposed controller including an inner current controller for controlling the negativeand positive-sequence components and a controller for suppressing the zero-sequence component is designed to eliminate harmonic propagation from the faulty three-phase AC system to the DC side of the HVDC system, resulting in suppressing ripples in DC-line voltage and current. The theoretical analysis and proposed controller are verifi ed by a simulation model in PSCAD platform.
Multi-modulating Pattern - A Unified Carrier based PWM method In Multi-level Inverter - Part 2
Nguyen Van Nho,Myung Joong Youn,IEEE Senior Member 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents a systematical approach to study carrier based PWM techniques (CPWM) in diode-clamped and cascade multilevel inverters by using a proposed named multi-modulating pattern method. This method is based on the vector correlation between CPWM and the space vector PWM (SVPWM) and applicable to both multilevel inverter topologies. A CPWM technique can be described in a general mathematical equation, and obtain the same outputs similarly as of the corresponding SVPWM. Control of the fundamental voltage, vector redundancies and phase redundancies in multilevel inverter can be formulated separately in the CPWM equation. The deduced CPWM can obtain the full vector redundancy control, and fully utilize phase redundancy in a cascade inverter. In this continued part, it will be deduced correlation between CPWM equations in multi-carrier system and single carrier system, present the mathematical model of voltage source inverter related to the common mode voltage and propose a general algorithm for multi-modulating modulator. The obtained theory will be demonstrated by simulation results..
Design Considerations of Recent Advanced Monolitic Current-Mode DC-DC Converters
Edward N. Y. Ho,Philip K. T. Mok,Senior Member 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
CMOS monolithic current-mode DC-DC converters have been widely used as a core part of integrated power management circuits. The design of the current sensors and efficiency enhance structures are challenging and have kept evolving with the advanced technology. A review of the state-of-the-art current sensor designs and efficiency enhancement structure will be discussed in the paper.
A SERIES ACTIVE POWER FILTER ADOPTING CONTROL APPROACH OF DETECTING LOAD VOLTAGE
Yao Weizheng,Wang Qun,Liu Jinjun,Wang Zhaoan,Senior Member 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In this paper a new control approach of detecting load voltage is proposed. It can directly detect the ac side harmonic voltage of a voltage source load for the series APF to do dynamic compensation for harmonic voltages. In addition, the control methods of PWM inverter and its dc side voltage are discussed. According to these, a prototype of the series APF is manufactured and corresponding experiment studies are done.<br/>