This thesis aims to identify and analyze the nonlinear behavior in the threephase voltage source converter, which is widely used as an interface converter in a distributed hybrid power system (DHPS). In this system, the converter does not work as a standalone converter but operates as a subsystem that connects to a non-ideal power grid and interacts indirectly with other subsystems via a point ...

In this paper, a non isolated multi-input multi-output dc–dc boost converter is proposed. This converter is used to implant alternative energy sources in electric vehicles. However, advantages of different sources of energy are achievable by the implant energy sources. This converter has many outputs with different voltage levels, which can be interfaced with multilevel inverters. In this conve...

The controller is used to improve the dynamic performance of DC-DC converter by achieving a robust output voltage against load disturbances. This paper presents the performance of PI and Fuzzy controller for a phaseshifted zerovoltage switched full-bridge PWM (ZVS FBPWM) converters with a closed loop control. The proposed converter is regulated with minimum overshoot and good stability. In this...

A precision CMOS voltage reference circuit is very important for the design of the stable voltage down converter of the high density VLSIs. By using the active mode operation of the component MOS transistors a CMOS bandgap type reference voltage circuit was redesigned for the enhancement of the circuit stability against the internal noises. The voltage supply independence, temperature independe...

The matrix converter instability can cause a substantial distortion in the input currents and voltages which leads to the malfunction of the converter. This paper deals with the effects of input filter type, grid inductance, voltage fed to the modulation algorithm and the synchronous rotating digital filter time constant on the stability and performance of the matrix converter. The studies are ...

The present work deals with the modeling and the stability analysis of the cascaded converters. When a converter tightly regulates its output, it behaves as a constant power load (CPL). The problem of CPLs is that they show negative incremental resistance that causes instability in the system because the control to output transfer function possessed a RHP pole. Hence the CPL has been modeled an...

Power-factor-correction (PFC) power supplies are required to provide high input power factor and tight output voltage regulation. The usual configuration takes a two-stage cascade structure, consisting of a PFC preregulator and a dc/dc converter. Previous studies of the dynamical behaviour mainly focused on the boost PFC preregulator, assuming that it is being terminated by a resistive load. Ho...

The subject of this paper is a general theory for a switched power converter, where the switch is controlled according to a pulse-width-modulation strategy. The pulse-width-modulated switched power converter is transformed into an equivalent discrete-time system. With this system the existence, uniqueness and stability of stationary solutions is investigated. Also stability of deviations from a...

We propose a method of estimating the fast-scale stability margin of dc–dc converters based on Filippov’s theory—originally developed for mechanical systems with impacts and stick-slip motion. In this method one calculates the state transition matrix over a complete clock cycle, and the eigenvalues of this matrix indicate the stability margin. Important components of this matrix are the state t...