Analysis of the influence of dynamic components of AC/DC system on transient voltage stability based on energy function method

Abstract

With the interconnection of large power networks, transient voltage stability of AC/DC power systems has been paid more attention in recent years. To investigate main influence of generating facility, high-voltage direct current (HVDC) and motor load for transient voltage stability, from the perspective of the generalised branch potential energy, the new indexes, and analysis method is proposed here. First, an energy function for AC/DC system is constructed with major dynamic components, namely classical HVDC control systems and motors in third-order model. Accordingly, the influence effects of the above major dynamic elements are investigated based on indexes from the corresponding generalised branch potential energy. With the rule of change in transient potential energy distribution in the network and information in stability margins, an evaluating procedure is established. Here, the judgment of transient voltage stability employs a heuristic energy function method. Finally, simulation tests on three-machine system with a HVDC transmission line are conducted in PSAT package, and the obtained results demonstrate the feasibility and effectiveness of the proposed method.

Keywords

• HVDC power transmission
• power transmission control
• power system faults
• power system transient stability
• electric motors
• power transmission lines
• transient voltage stability
• dynamic components
• classical HVDC control systems
• corresponding generalised branch potential energy
• transient potential energy distribution
• heuristic energy function method
• motor load
• AC-DC power systems
• high-voltage direct current
• generalised branch potential energy
• third-order model
• stability margins
• three-machine system
• simulation tests
• PSAT package