This project provides guidelines for preparation of functional specification for solid state shunt device used to compensate voltage fluctuation. The guide covers devices rated to medium voltage (1-35kV). The device contains in general: an inverter, rectifier or DC converter, energy storage device, coupling transformer connected in parallel. In addition, additional equipment should be provided to assure proper interface with the electric network. The additional equipment includes: voltage and current transformers, disconnect switches, circuit breakers and three phase low voltage service for auxiliary power.