Synchronous compensators

Abstract

This paper presents models verified by tests of the Excitation Control Systems (ECSs) of six large Synchronous Compensators (SCs) rated +125/-120 MVAr. These equipments for grid voltage control are placed in the substation Ezeiza of 500 kV belonging to the Interconnected Argentine System (SADI in Spanish). The substation Ezeiza is located in the SADI load center. Each SC has an ECS integrated by an Automatic Voltage Regulator (AVR) with several limiters and a Reactive Power Control (RPC). ECSs are governed by a single Voltage Joint Control (VJC) to control the voltage at 500 kV bus bar. The ECS is UNITROL F from ABB and the VJC is implemented in a programmable logic controller (PLC). The AVR, RPC and VJC models are presented. These models were predefined with information furnished by manufacturer. Then, these models were validated by tests. Test records and their simulations with proposed model are also presented. Described models have been incorporated to the Data Base of Dynamic Models used for stability studies in the SADI.