This book deals exclusively with the power-flow modelling of HVDC transmission systems. Different types of HVDC transmission systems, their configurations/connections and control techniques are covered in detail. Power-Flow modelling of both LCC- and VSC-based HVDC systems is covered in this book. Both the unified and the sequential power-flow methods are addressed. DC grid power-flow controllers and renewable energy resources like offshore wind farms (OWFs) are also incorporated into the power-flow models of VSC-HVDC systems. The effects of the different power-flow methods and HVDC control strategies on the power-flow convergence are detailed along with their implementation.

Features:

• Introduces the power-flow concept and develops the power-flow models of integrated AC/DC systems.
• Different types of converter control are modelled into the integrated AC/DC power-flow models developed.

• Both unified and the sequential power-flow methods are addressed.

• DC grid power-flow controllers like the IDCPFC and renewable energy resources like offshore wind farms (OWFs) are introduced and subsequently modelled into the power-flow algorithms.

• Integrated AC/DC power-flow models developed are validated by implementation in the IEEE 300-bus and European 1354-bus test networks incorporating different HVDC grids.

This book aims at researchers and graduate students in Electrical Engineering, Power Systems, and HVDC Transmission.

Dr. Shagufta Khan received the Ph.D. degree in electrical engineering from Delhi Technological University, Delhi, India. She is currently an Assistant Professor with the School of Electrical, Electronics and Communication Engineering, Galgotias University, Greater Noida, India. Her research interests include power systems and renewable energy. She has several publications in national and international journals and conferences including IEEE Transactions on Sustainable energy, Electrical Power system research (Elsevier), International Journal of Electrical Power and Energy systems (Elsevier), Electrical Energy Journal (Springer), AIN Shams engineering Journal (Elsevier), Arabian Journal for Science and Engineering (Springer) to her credit.

Prof. Suman Bhowmick received his Bachelor of Electrical Engineering (Hons.) and Master of Electrical Engineering degrees from Jadavpur University, Kolkata, India in 1989 and 1992, respectively. He served as a Design Engineer in a reputed consultancy firm for a brief period before joining the Department of Electrical Engineering, Delhi College of Engineering (currently known as Delhi Technological University), Delhi in 1996. He received his Ph.D. in Electrical Engineering from the Faculty of Technology, University of Delhi in 2010. He has been working as a Professor in the Department of Electrical Engineering, Delhi Technological University since 2012. His areas of interest are Power Systems in general, FACTS and VSC based HVDC systems. He has several publications in national and international journals and conferences to his credit. He has also authored a book on FACTS which was published by the CRC Press, U.S.A. in 2016.

This book deals exclusively with the power-flow modelling of HVDC systems alongwith details of different type of HVDC systems, their configuration/connections, adopted control techniques, and gradually builds upto power-flow modelling concept. It covers LCC- and VSC-based HVDC systems followed by power-flow modelling of HVDC systems integrated with renewable energy sources. It details DC grid power-flow controllers into the power-flow modelling of VSC-HVDC systems. The effect of the power-flow approaches and HVDC control strategies is detailed with their implementation.

Features:

• Discusses steady state (i.e., power flow) solution of integrated AC/DC system for operating any multi-terminal HVDC grid within an existing AC grid.
• Presents a detailed theoretical analysis of the system equilibrium under the different types of converter control.
• HVDC power-flow models developed have been validated by implementation in IEEE 300-bus test network integrated with different HVDC grids.
• DC grid power-flow controllers like the IDCPFC has been introduced and subsequently modeled into the powerflow algorithm.
• Both unified and sequential powerflow models are covered.

This book aims at Researchers and Graduate students in Electrical Engineering, Power Systems, and HVDC Transmission.

Chapter 1: HVDC Transmission Systems 1.1 Introduction 1.2 Interconnections of HVDC systems 1.3 Control of HVDC systems 1.4 Introduction to DC power flow controllers 1.5 Integration of renewable energy sources(RES) to HVDC grid 1.6 Introduction to the Newton-Raphson method and the power-flow problem 1.7 Introduction to the power flow modelling of LCC-based integrated AC-DC systems 1.8 Introduction to the power flow modelling of VSC-based integrated AC-DC systems 1.9 Organization of the book

Chapter 2: Power-Flow Modelling of AC power systems integrated with LCC-based multiterminal DC (AC-MLDC) grids 2.1 Introduction 2.2 Modelling of Integrated AC-MLDC Systems 2.3 Control strategies for MLDC grids 2.4 Power Flow Equations of Integrated AC- MLDC Systems 2.5 Power-flow implementation of integrated AC-MLDC systems 2.6 Case studies and results 2.7 Summary Chapter 3: Power Flow Modelling of AC power systems integrated with VSC-based multiterminal DC (AC-MVDC) grids employing DC Slack-Bus Control 3.1 Introduction 3.2 Modelling of hybrid AC-MVDC Systems Employing DC Slack Bus Control 3.3 Power Flow Implementation of integrated AC-MVDC systems employing DC slack bus control 3.4 Case Studies and Results 3.5 Summary Chapter 4: Power Flow Modelling of AC power systems integrated with VSC-based multiterminal DC (AC-MVDC) grids employing DC Voltage Droop Control 4.1 Introduction 4.2 Modeling of Hybrid AC-MVDC Systems Employing DC Voltage Droop Control 4.3 Power Flow Equations of hybrid AC- MVDC systems employing DC Voltage Droop Control 4.4 DC Voltage droop control in MVDC Systems 4.5 Modeling of AC-MTDC Systems with DC Voltage Droop Control 4.6 Case Studies and Results 4.7 Summary

Chapter 5: Power Flow Modelling of AC power systems integrated with VSC-based multiterminal DC (AC-MVDC) grids incorporating Interline DC Power Flow Controller (IDCPFC) 5.1 Introduction 5.2 Modelling of AC-MVDC Systems incorporating IDCPFCs 5.3 Power Flow Equations of hybrid AC- MVDC systems incorporating IDCPFC 5.4 Implementation in Newton Power Flow Analysis 5.5 Case studies and results 5.6 Summary Chapter 6: Power Flow Modelling of AC power systems integrated with VSC-based multiterminal DC (AC-MVDC) grids incorporating renewable energy sources 6.1 Introduction 6.2 Modelling of AC-MVDC systems incorporating renewable energy sources 6.3 Power flow equations in the proposed model of hybrid VSC-HVDC System with Renewable Energy Sources 6.4 Modeling of AC-MTDC systems employing DC slack bus control 6.5 Modeling of AC-MTDC Systems with DC Voltage Droop Control 6.6 Case Studies and Results 6.7 Summary