Power Electronic Converters

INTRODUCTION
Introduction
Implementation of Current-Fed Converters
Dynamic Modeling of Power Electronic Converters
Linear Equivalent Circuits
Impedance-Based Stability Assessment
Time-Domain-Based Dynamic Analysis
Renewable Energy System Principles
Content Review

DYNAMIC ANALYSIS AND CONTROL DYNAMICS
Introduction
General Dynamic Representations - DC-DC
General Dynamic Representations - DC-AC, AC-DC
General Source and Load Interaction Formulations
General Impedance-Based Stability Analysis
Control Design Basics

PART I: Voltage-Fed DC-DC Converters

DYNAMIC MODELING OF DIRECT-ON-TIME CONTROL
Introduction
Direct-on-Time Control
Generalized Modeling Technique
Fixed-Frequency Operation in CCM
Fixed-Frequency Operation in DCM
Source and Load Interactions
Impedance-Based-Stability Issues
Dynamic Review

DYNAMIC MODELING OF CURRENT-MODE CONTROLS
Introduction
PCM-Control Principle
PCM Modeling in CCM
PCM Modeling in DCM
ACM Modeling in CCM
Source and Load Interactions
Impedance-Based-Stability Analysis
Dynamic Review

DYNAMIC MODELING OF CURRENT-OUTPUT CONVERTERS
Introduction
Dynamic Models for Current-Output Converters
Source and Load Interactions
Impedance-Based-Stability Analysis
Dynamic Review

CONTROL DESIGN ISSUES
Introduction
Feedback Loop Design Principles
Input-Voltage Feedforward
Output-Current Feedforward
Output-Voltage Remote Sensing

PART II: Current-Fed DC-DC Converters

INTRODUCTION TO DESIGN OF CURRENT-FED CONVERTERS
Introduction
Duality Transformation Technique
Application of Duality Transformation Technique
Adding a Capacitor at the Input Terminal

INTRODUCTION TO PHOTOVOLTAIC GENERATOR AS AN INPUT SOURCE
Introduction
Equivalent Circuit Model
Behavior of PV Generator Under Varying Environmental Conditions
Short Introduction to MPP-Tracking Methods
Short Introduction to MPP-Tracking Design Issues
Short Introduction to CF Converter Power-Stage Design Issues

DYNAMIC MODELING OF DIRECT-DUTY-RATIO-CONTROLLED CF CONVERTERS
Introduction
Dynamics Model of Duality-Transformed Converters
Dynamics Model of Input-Capacitor Added Converters
Source and Load Interactions
Impedance-Based Stability Issues
Dynamic Review

DYNAMIC MODELING OF PEAK-CURRENT AND PEAK-VOLTAGE-CONTROLLED CURRENT-FED CONVERTERS
Introduction
Dynamic Modeling of PCM Control
Dynamic Modeling of PVM Control
Source and Load Interactions
Impedance-Based Stability Issues
Dynamic Review

CONTROL DESIGN ISSUES
Introduction
Feedback Loop Design Principles
Cascaded Feedback Loop Design Principles

PART III: Three-Phase AC-DC PWM Rectifiers

DYNAMIC MODELING OF THREE-PHASE PWM RECTIFIERS
Introduction
Dynamic Model of Three-Phase PWM Rectifier with Constant Voltage and Current Loads
Dynamic Modeling of Cascaded Control Scheme
Dynamic Modeling of Phase-Locked-Loop
Effect of Grid and Load Impedances
The Appearance of RHP-Pole in Regenerative Mode

CONTROL DESIGN OF THREE-PHASE PWM RECTIFIERS
Phase-Locked-Loop
AC-Current-Control
DC-Voltage-Control
Control Design in Regenerative Mode

IMPEDANCE SHAPING OF THREE-PHASE PWM RECTIFIERS
Closed-Loop AC and DC-Side Impedance of Cascade-Controlled PWM Rectifier
Negative Resistance in Rectifier Mode
Negative Resistance in Regenerative Mode
Shaping Impedance Using Feedforward Compensation
Effect of Space-Vector Modulation
Shaping Impedance Using Active Damping

PART IV: Three-Phase VSI-Based DC-AC Inverters

DYNAMIC MODELING OF VOLTAGE AND CURRENT-FED INVERTERS
Introduction
Dynamic Model of Three-Phase Inverter in Voltage-Fed Applications
Dynamic Model of Three-Phase Inverter in Current-Fed Applications
Dynamic Model of Three-Phase Inverter with LCL-Filter

MODELING OF GRID-CONNECTED VOLTAGE-FED INVERTER
Introduction
Dynamic Modeling of Control Loops
Control Design of Voltage-Fed Inverters
Impedance-Shaping of Voltage-Fed Inverters

MODELING OF GRID-CONNTECTED CURRENT-FED INVERTER
Introduction
Dynamic Modeling of Control Loops
The Effect of Voltage-Boosting DC-DC Stage
Control Design of Current-Fed Inverters
Impedance-Shaping of Current-Fed Inverters

MODELING OF VOLTAGE AND CURRENT-FED INVERTERS IN ISLANDING MODE
Introduction
Dynamic Modeling of AC-Side Voltage Control Loop
Operational Limits in Photovoltaic and Wind Applications
Control Design
Impedance-Shaping of Output-Voltage-Controlled Inverters

Teuvo Suntio is Professor in Power Electronics at Tampere University of Technology, Finland. He has been also Adjunct Professor in Control Engineering at the Aalto University (TKK) in 2001-2011, and in Power Electronics at the University of Oulu since 2004. He has also served 20 years in power electronics industry as a design engineer and an R&D manager prior to starting the academic career in 1998. He has authored or co-authored over 200 international conference and journal articles, supervised close to 100 MSc students as well as 18 PhD students during the nineteen years in academy.

Tuomas Messo is Assistant Professor in Power Electronics at Tampere University of Technology, Finland. His current research aims to identify the source of harmonic resonance problems reported in grid-connected power electronic systems through dynamic modeling and mitigating the problems by shaping the inverter impedance. His teaching activities include basic power electronic courses and advanced courses, which concentrate on DC-DC converter design and dynamic analysis of three-phase DC-AC converters.

Joonas Puukko is with ABB Oy High Power Drives in Helsinki, Finland. Previously he was with ABB Oy Solar Inverters and ABB Inc. United States Corporate Research. He obtained his PhD from Tampere University of Technology, Finland, for a work on dynamics of grid-connected three-phase converters. He has expertise in hardware and control system design in various power electronics applications ranging from few tens of watts to hundreds of kilowatts.

T. Suntio, Tampere University of Technology, Finland; T. Messo, Tampere University of Technology, Finland; J. Puukko, Tampere University of Technology, Finland