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Control of a high-performance 3-phase inverter

Author(s):

E. Bianda, E. Illiano
Conference/Journal:

Semester/Bachelor Thesis, WS 07/08
Abstract:

In decentralized renewable energy production systems or in drives where power regeneration is desirable during braking, it is necessary to have a converter that can inject energy into the utility grid. For that reason, bidirectional power active front end converters become an important component in many applications. So far, voltage source converter are the most common bidirectional power active front end converters. However, the current ripple and pollution that is injected into the grid by the converter fast switching is not compatible with the need of fulfilling high power quality standards. In order to avoid that problem, the connection of an EMI filter between the converter and the grid is often necessary. This filter removes both the current ripple and propagated electromagnetic pollution. The design of these EMI filter is complex, however for the point of view of the control, the EMI filter can simply be considered as a resonant second order system that is added to the first order boost inductor of the voltage source converter as shown in the schematic of Fig. 1. The overall passive structure that interfaces the converter switching cells and the grid is a third order resonant filter. This filter ideally does not comprise any damping element in order to minimize the converter losses. As a consequence of the absence of passive damping the resonance that can occur due to the converter switching or due to an external disturbance on the grid has to be controlled and damped actively through the converter control. The robustness of the control to grid impedance, unbalances and distortions as well as to load variations determines a big part of the system performances. In this context, this semester project aims to realize an experimental system that will allow to test different control methods. This experimental setup will comprise an active front end voltage source converter with its filter, a (unbalanced and distorted) grid generator and a (non-linear variable) load generator. The project will be divided into two parts: 1. design, control and realization of an active front end voltage source converter, 2. design, control and realization of a grid and load generator. The two project part are independent, however, as there are similitudes between these two parts, some discussions and collaborations are desirable between the two candidates. Moreover, the project ultimate goal is to put the two parts together.

Supervisors: Prof. M. Morari, Dr. S. Mariethoz

Year:

2008
Type of Publication:

(13)Semester/Bachelor Thesis
Supervisor:

S. Mariéthoz

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% Autogenerated BibTeX entry
@PhdThesis { BiaIll:2008:IFA_3078
}
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