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Pereira Passos Hydroelectric Plant

DCS Modernization

Altus was contracted to modernize the Digital Supervision and Control System at the Pereira Passos Hydroelectric Plant.

Developing the New Digital Supervision and Control System

Inaugurated in 1962, the Pereira Passos Hydroelectric Plant is part of the Lajes Hydroelectric Complex, located in Piraí, Rio de Janeiro. It operates with two generating units and a 37.5-meter water head, providing an installed capacity of 100 MW.

Em 2018, a Light Energia iniciou o processo de modernização do Sistema Digital de Supervisão e Controle da usina utilizando a tecnologia dos produtos da Série HX. O projeto incluiu lógicas de aquisição e controle e um novo sistema supervisório, além de disponibilizar o controle e supervisão ao COG Light no Rio de Janeiro/RJ.

Remote Supervision and Control

Reduction in space and wiring, resulting in increased reliability, cost savings, and enhanced supervision and control capabilities

Enhanced Productivity

Boosted operational efficiency across the entire system, lowering costs and improving response times

Reliability and Durability

A robust communication system with enhanced diagnostics. An open, easy-to-maintain supervisory system

High Availability

Minimized downtime through fast fault detection and identification

Solução de Supervisão e Controle de Processos

Process Supervision and Control Solution

The typical UAC architecture for Generating Units 01 and 02 features a main 18-slot HX9103 rack with two redundant 125VDC HX8320 power supplies and two redundant HX3040 processors. These processors communicate with local and remote supervisory systems via the IEC 104 protocol. The setup also includes 11 125VDC digital input cards (HX1120), each with 32 digital inputs, and two 125VDC digital output cards (HX2320), each with 16 outputs.

The second rack, a 9-slot HX9101 model, contains two HX8320 power supplies connected to the other racks via two NX9205 Ethernet cables, along with two HX6000 analog cards configurable for current or voltage input, each with 16 inputs. It also includes three HX6020 RTD input modules, each with 8 inputs, and two HX9102 covers.

Each HX3040 CPU is connected to the Ethernet port on the network switches installed in the UCPS Panel. These CPUs receive SNTP synchronization through the REASON GPS provided by Light. They also receive MODBUS-RTU signals from the GE PQM II Power Meter via the AL-2600 serial splitter. The main GE protection relay for the generating unit communicates with the UAC using the DNP3 protocol, with the relays connected to the switches installed in the UCPS Panel.

Reliable Communication Networks

The UACs feature two redundant CPUs connected to the supplied switches, forming a star topology network, as illustrated in the diagram below.

O escopo do sistema fornecido pela Altus

Scope of the System Provided by Altus

- Troca dos CLPs SAITEL 2000 atuais das UAC s UG1, UG2, SE e SA pelas UTRs da Série HX, que serão instaladas em placa de montagem, sendo transferida todas as lógicas atualmente existentes para o novo controlador

- Provision of two switches for configuring the star network

- Provision of 1 synchronizing relay for the two existing lines in the substation (which operates with a single bus bar)

- Provision of one 19” rack-mount server

O escopo dos serviços fornecidos na solução

Scope of Services Provided

- Development of Executive and Software projects

- Integration with the existing water intake UAC, provided by Altus, via a multimode fiber optic connection, with at least one spare pair, integrated through the DNP3 protocol

- Factory Acceptance Testing (FAT) and on-site commissioning of the supplied system

- Maintenance and Operation Training

- Documentation updates, including revisions to the plant’s documentation reflecting the new system implementation