Coordinated control of SMES and wind farm during fault in order to restrict rotor angle acceleration of power systems

Abstract

Summary Superconducting magnetic energy storage (SMES) units used along with wind farms are normally controlled with the aim of reducing the fluctuation in power injection to the grid due to wind speed variability. However, this paper proposes a modification of that control objective during system disturbances in order to reduce the accelerating power and improve stability margin. When the bus voltages get depressed due to short circuit fault in a nearby bus, the SMES is operated to draw additional active power from the system by means of modified control of the interfacing current sourced converter. Simultaneously, the grid side converter associated with the wind generator is operated to inject reactive power thus increasing bus voltage and power drawal by the SMES. This causes a reduction in the transient imbalance between electrical power and mechanical power of the nearby synchronous generators and thus enhances stability margin. In the post fault condition, the SMES and doubly fed induction generator active power outputs are controlled in such a fashion so as to improve further the transient stability of the overall power system. The study is carried in WSCC three‐machine nine‐bus system and IEEE 16‐machine 68‐bus system in PSCAD/EMTDC and MATLAB platforms.

Design of HHO-PID Controllers for Load Angle of Power Plant Synchronous Generators

“…In [19], modification of control objective is proposed to reduce the rotor angle acceleration power systems and improve the stability margin during system disturbances. In [20], the design of a proportional derivative controller (PID) based on low-frequency oscillation damping using a power system stabilizer for large-scale photovoltaic farms is proposed.…”