Physics-based discrete modelling and digital control design for grid-side inverters for renewable energy

This work lays out the methodology of the analysis and consequent control design for the LC filter application on the example of a 5 MW wind turbine. The chapters progress sequentially through the different complexity steps from the continuous analysis to the discrete-space modeling to control algorithm design, integrated into a microcontroller-based hardware setup. The methods in each complexity step illustrate the process, starting with the identification of the control issue, through the control solutions, and ending with the evaluation using dynamic analysis.Diese Arbeit legt die Methodik der Analyse und des anschließenden Regelungsentwurfs für die LC-Filteranwendung am Beispiel einer 5-MW-Windturbine dar. Die Kapitel führen durch die verschiedenen Komplexitätsstufen von der kontinuierlichen Analyse über die Modellierung im diskreten Raum bis hin zum Entwurf des Regelalgorithmus, der in eine mikrocontrollerbasierte Hardware integriert ist. Die Methoden jedes Komplexitätsschritts veranschaulichen den Prozess, beginnend mit der Identifizierung des Regelungsproblems, über die Regelungslösungen und endend mit der Bewertung mittels dynamischer Analyse

Design and Control of Power Converters 2019

In this book, 20 papers focused on different fields of power electronics are gathered. Approximately half of the papers are focused on different control issues and techniques, ranging from the computer-aided design of digital compensators to more specific approaches such as fuzzy or sliding control techniques. The rest of the papers are focused on the design of novel topologies. The fields in which these controls and topologies are applied are varied: MMCs, photovoltaic systems, supercapacitors and traction systems, LEDs, wireless power transfer, etc

Design and control of a multicell interleaved converter for a hybrid photovoltaic-wind generation system

The solution for the generating energy derived from non-polluting sources configures a worldwide problem, which is undetermined, complex, and gradual; and certainly, passes through the diversification of the energetic matrix. Diversification means not only having different sources converted into useful energy, like the electricity, but also decentralizing the energy generation in order to fit with higher adequacy the demand, which is decentralized too. Distributed Generation proposes this sort of development but in order to increase its penetration several technical barriers must be overpassed. One of them is related to the conversion systems, which must be more flexible, modular, efficient and compatible with the different energy sources, since they are very specific for a certain area. The present study drives its efforts towards this direction, i.e. having a system with several inputs for combining different renewable energy sources into a single and efficient power converter for the grid connection. It focuses on the design and control of an 11.7 kW hybrid renewable generation system, which contains two parallel circuits of photovoltaic panels and a wind turbine. A multicell converter divided in two stages accomplishes the convertion: Generation Side Converter (GSC) and Mains Side Converter (MSC). Two boost converters responsible for the photovoltaic generation and a rectifier and a third boost, for the wind constitue the GSC. It allows the conversion to the fixed output DC voltage, controlling individually and performing the maximum power point tracking in each input. On the other side, the single-phase 4- cell MSC accomplishes the connection to the grid through an LCL filter. This filter uses an Intercell Transformer (ICT) in the first inductor for reducing the individual ripple generated by the swicthing. The MSC controls the DC-link voltage and, by doing that, it allows the power flow from the generation elements to the network

Sliding Mode Control

The main objective of this monograph is to present a broad range of well worked out, recent application studies as well as theoretical contributions in the field of sliding mode control system analysis and design. The contributions presented here include new theoretical developments as well as successful applications of variable structure controllers primarily in the field of power electronics, electric drives and motion steering systems. They enrich the current state of the art, and motivate and encourage new ideas and solutions in the sliding mode control area