Real-Time Simulation of SVC on Multi-Machine 9-Bus System

The interconnections in the power system increase the power transmission level, nevertheless decreasing in voltage level margin. The main reason for voltage instability is reactive power limits. Reactive power can be well controlled using a Flexible AC Transmission System (FACTS) with improvement in voltage instability and thereby voltage collapse. Power systems being geographically diverse or distributed over large areas is impractical to test physically but can be tested explicitly with real-time (RT) Simulators in the laboratory. Also, the controllers, protection devices, and other elements can be tested in real-time on the same system. Tests for system stability, and controller response can be carried out with all the possible combinations of inputs, faults, loading conditions etc. This paper presents the implementation of a static var compensator (SVC) for improvement in voltage profile during normal conditions of the power system as well as during LLLG fault conditions on RT Simulator OP4510. The input and output devices of the RT Simulator are used to observe the waveforms of active and reactive power and current on a Digital Storage Oscilloscope (DSO), while validated on a multi-machine 9-bus system. These waveforms indicate that SVC supplies or absorbs the reactive power and maintains the bus voltage profile when it is within its rating, but when it is above its rating, it acts as fixed susceptance. The improvement in system voltage is also shown using .m-file.