Improved Power Flow Algorithm for VSC-HVDC System Based on High-Order Newton-Type Method

Abstract EN

Voltage source converter (VSC) based high-voltage direct-current (HVDC) system is a new transmission technique,which has the most promising applications in the fields of power systems and power electronics.

Considering theimportance of power flow analysis of the VSC-HVDC system for its utilization and exploitation, the improvedpower flow algorithms for VSC-HVDC system based on third-order and sixth-order Newton-type method arepresented.

The steady power model of VSC-HVDC system is introduced firstly.

Then the derivation solving formatsof multivariable matrix for third-order and sixth-order Newton-type power flow method of VSC-HVDC system aregiven.

The formats have the feature of third-order and sixth-order convergence based on Newton method.

Further,based on the automatic differentiation technology and third-order Newton method, a new improved algorithm isgiven, which will help in improving the program development, computation efficiency, maintainability, and flexibilityof the power flow.

Simulations of AC/DC power systems in two-terminal, multi-terminal, and multi-infeed DCwith VSC-HVDC are carried out for the modified IEEE bus systems, which show the effectiveness and practicalityof the presented algorithms for VSC-HVDC system.