4 research outputs found
Corrective control: stability analysis of Unified Controller combining frequency control and congestion management
This paper analyses stability of the Unified Controller (UC) that combines
frequency control and congestion management and therefore makes it possible to
move from preventive to corrective power system control. Earlier work by the
authors of UC proved asymptotic stability of the methodology but the proof was
based on a simplified first-order model of the turbine and turbine governor. We
show that a higher order model of the turbine governor leads to eigenvalues
with small but positive real parts. Consequently, we develop a modification of
the methodology that decouples the physical and control systems and therefore
results in all the eigenvalues having negative real parts. We illustrate the
effectiveness of the modification on a realistic model of 39-bus model of New
England power system implemented in Power System Toolbox (PST)