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This paper presents an analytical design method of indirect full digital controller with a simple structure for three-phase inverter system. Most of conventional researches on the analytical design of controller have been studied about the structure of continuous-time controller, and so the final implementation of full digital controller for industrial application was complicate and anyway based on...
In this paper, a generalized and systematic methodology is proposed to solve a closed-loop converter system. The methodology involves two steps. First, one will identify where the loop would be broken. Then, one locates the unknown variables to be solved and formulates the corresponding iterative algorithm. The proposed method uses a top-down approach to obtain the steady-state solution of a closed-loop...
In this paper, a robust field-weakening control strategy for IPMSM drives is proposed to achieve fast response and minimum copper loss. First, the classification of three operation regions for positive speed operation is adopted. It is seen that current limit and voltage limit will affect the maximum torque capability and minimum copper loss operation. Second, in order to achieve minimum copper loss...
Parallel electrostatic suspension is proposed and studied analytically. In parallel electrostatic suspension systems, a single power amplifier is operated to suspend multiple floators or control the multiple-degree-of-freedom motions of a floator. The controllability of parallel magnetic suspension system is discussed both for direct and indirect voltage controlled systems. The conditions for each...
A power conditioner with a high voltage gain for a combined heat and power generation system based on a solid oxide fuel cell is presented in this paper. The power conditioner consists of two dc-to-dc stages: an interleaved boost converter with minimized input current ripple and a series resonant converter. By analytic investigation, a pre-estimation of the converter's efficiency is shown and a method...
In recent years, multilevel technology has become an effective and practical solution for moderate and high voltage application field. In all multilevel technology, cascade multilevel inverters have become the major circuits used in power quality conditioners. Evidently, the voltage balancing problem of DC capacitors of cascade inverters is a key problem to the power quality conditioners. This paper...
This paper describes a fast torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC) considering overmodulation region of inverter. In overmodulation region, output voltage of inverter contains harmonic voltage which influences performance of current control and can't be avoided. To consider influences of harmonic voltage, we use a harmonic voltage...
This paper presents position sensor-less control of low-inductance and high-speed permanent magnet synchronous motor (PMSM) drives. The proposed method estimates flux from a reduced order observer and estimates pole position with estimated flux. For low-inductance PMSM, current detection is difficult, because the current varies rapidly. Therefore, pole position estimation with the measured current...
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