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Pereira Passos Hydroelectric Plant

Modernization of the DCS

Altus was contracted to carry out the retrofit of the Digital Supervision and Control System (SDSC) at the Pereira Passos Hydroelectric Power Plant (HPP), part of the Lajes Hydroelectric Complex in Brazil.

Developing the New Digital Supervision and Control System

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

In 2018, Light Energia initiated the modernization of the plant’s Digital Supervision and Control System using HX Series technology. The project encompassed the implementation of new acquisition and control logic, as well as the deployment of an updated supervisory system. Additionally, the solution enabled remote control and supervision from Light’s Generation Operations Center (COG), located in Rio de Janeiro, enhancing operational efficiency, reliability, and centralized management of the plant.

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 time

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

Process Supervision and Control Solution

The typical architecture of a UAC in Generating Units 01 and 02 consists of 01 main HX9003 rack with 18 positions containing 02 redundant 125Vdc HX8320 power supplies, 02 redundant HX3040 processors – which communicate with the local and remote supervisory systems via the IEC 104 protocol – 11 HX1120 125Vdc digital input cards with 32 digital inputs each, and 02 HX2320 125Vdc digital output cards with 16 outputs each.

The second rack, model HX9001 with 9 positions, has 2 HX8320 power supplies, which connect to the other racks via 2 Ethernet cables, 2 HX6000 analog cards, which can be configured with current or voltage input with 16 inputs each, and 3 HX6020 RTD input modules, with 8 inputs each.

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 Field Automation Units (FAUs) feature two redundant CPUs, each connected to the two access switches in a dual-star topology. This ensures automatic routing in case of failure, segregation of critical control traffic from monitoring traffic, application of independent VLAN and security policies, and facilitates diagnostics via SNMP and the addition of new units without interrupting operation.

Scope of the system provided by Altus

The system scope provided by Altus includes the replacement of the PLCs of the UACs UG1, UG2, SE, and SA with HX Series UTRs installed on a mounting plate, with all existing logic fully ported to the new controllers. It also includes the supply of switches for assembling a star network, the provision of a synchronization relay for the two existing lines in the substation, and the delivery of a standard 19” rack server.

Scope of services provided in the solution

The scope also includes the 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, using the DNP3 protocol; execution of Factory Acceptance Testing (FAT) and on-site commissioning of the supplied system; delivery of maintenance and operation training; and updates to all relevant documentation, including revisions to the plant’s records to reflect the implementation of the new system.