Power-Flow Modelling of HVDC Transmission Systems

This paper presents a theoretical analysis of the steady-state solution of an integrated AC/DC system for operating multi-terminal HVDC grids within an existing AC grid. It discusses the development of HVDC power-flow models and their validation through implementation in the IEEE 300-bus test network. The paper also introduces the IDCPFC, a DC grid power-flow controller, and models it into the powerflow algorithm. Both unified and sequential powerflow models are covered.

Format: Hardback
Length: 268 pages
Publication date: 23 December 2022
Publisher: Taylor & Francis Ltd

The integration of high-voltage direct current (HVDC) systems into existing alternating current (AC) grids is a significant topic of research and development in the power industry. One key aspect of this integration is the solution of the steady-state (i.e., power flow) of the integrated AC/DC system, which involves ensuring that the power is transmitted efficiently and reliably between the two grids. In this paper, we present a detailed theoretical analysis of the system equilibrium under different types of converter control, including voltage source converters (VSCs) and current source converters (CSCs). We also discuss the development of HVDC power-flow models, which have been validated by implementation in the IEEE 300-bus test network, integrated with various HVDC grids.

One important aspect of HVDC power flow is the control of DC grid power-flow controllers, such as the Independent Dispersed Control Power Flow Controller (IDCPFC). These controllers are designed to optimize the power flow between the AC and DC grids, taking into account the dynamics and constraints of each system. We discuss the modeling of the IDCPFC into the powerflow algorithm and explore the benefits and challenges of using unified and sequential powerflow models for the integration of HVDC systems into AC grids.

In conclusion, the integration of HVDC systems into existing AC grids presents a complex challenge, but with the development of advanced power-flow models and control strategies, it is becoming increasingly feasible. This paper provides a comprehensive theoretical analysis of the system equilibrium and the control of HVDC power flow, and highlights the importance of validation and implementation in real-world test networks.

Dimension: 229 x 152 (mm)
ISBN-13: 9781032171661