Venkataramana Ajjarapu

Associate Professor

Dept. of Electrical and Computer Engineering

1122 Coover Hall

Iowa State University

Ames, IA 50011

Telephone: 515-294-7687

Fax: 515-294-4263


Email address:  

Key Words:

Voltage Stability and security, Available transfer capability

Research description:

  • Developing simulation tools to analyze power system voltage security.
  • Application of nonlinear dynamics and bifurcation theory is explored to understand the voltage collapse.
  • Developed continuation power flow (CPF) to accurately predict the voltage instability.
  • Formulating a sensitivity based preventive and corrective control strategy to mitigate the voltage collapse.
  • Investigating available transfer capability as limited by voltage collapse. Full differential and algebraic framework is utilized for the analysis. In this formulation there is no PV and slack bus assumptions. It provides true stability information. It automatically traces PV diagrams. There is a provision for unsolvable cases. The program systematically identifies the parameters that are critical for the voltage stability.

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