Electrical loads generate and absorb reactive power in the process of their work. Since the transmitted Power and load varies considerably from time to time in the course of an hour, the reactive power balance in a grid varies as well. The result can be unacceptable voltage amplitude variations, a voltage depression, or even a voltage collapse. A rapidly operating Static Reactive Compensator (SRC) can continuously provide the reactive power required to control dynamic voltage swings under various system conditions and thereby improve power system transmission and distribution performance. A Dynamic response system such as SRC will provide the necessary amplitude and phase angle support for the voltage waveform. Installing an SRC at one or more suitable points in the network can increase Power transfer capability and reduce losses while maintaining a smooth voltage profile under different network conditions. In addition, an SRC can mitigate active power oscillations through voltage amplitude modulation.

Dynamic Reactive Compensation

The power flow on utility grids consists of both active and reactive power. The difference is due to the fact that the wave of alternating current always leads (capacitive load) or lags (inductive load) the voltage wave. Reactive power (measured in volts-amperes reactive, or VAr) is the product of voltage and out of phase component of alternating current.

Utilities and industries pay close attention to reactive power because it determines how the voltage declines or 'sags' on an electric network. To stabilize voltage conditions, the generated reactive power has to be compensated. To an electric power consumer, optimisation of an existing power system increases productivity, decreases utility charges, and improves equipment reliability.