Backup systemGeothermal power plants have less auxiliary equipment and their control loops are not as complex as those at fossil fuel power plants. In addition, they cost less to operate. It is therefore feasible and desirable to run a geothermal power plant nonstop at full load. When a plant is operated in this way, reliability is a key concern. And even when the plant’s DCS has redundant controllers and is extremely reliable, there is still a risk that it might fail in a corrosive environment. For this reason, Yokogawa has provided a backup system. This backup system includes the following features: Sequence-of-events (SOE) stationAll events are precisely recorded with millisecond accuracy and displayed in a sequence of events (SOE) window for later analysis. Using this, operators can assess the cause of any problem and request a fix by maintenance personnel. Test systemWhen application software needs to be modified, the revised software must be tested before it can be downloaded to the controller, requiring a plant shutdown. To maximize plant uptime, Yokogawa provided a test system that uses the test functions of the CENTUM CS 3000. This test system accurately replicates the plant control and graphical interfaces, and the software can be easily checked under the same conditions as with the actual plant system. It can be also used to train the operators.• Monitors by using a graphical user interface to ensure safety operation while the backup system is engaged• Handles effective alarms• Performs emergency operation in the event that the DCS failsThe backup system ensures that the plant can run safely without any interruptions.In 2020, PGE selected Yokogawa’s CENTUM DCS to replace the existing control systems for its steamfield above ground system (SAGS) in Units 1-4. When this project is completed, both the SAGS and the power generators of Units 1-4 of the plant will be controlled by Yokogawa’s systems. The newly integrated system will maximize the potential of Industrial-Internet-of-Things devices when introduced, boosting productivity and efficiency.Furthermore in 2021, PGE chose Yokogawa for the procurement of a 500-kW binary organic rankine cycle (ORC) power plant to be connected to the SAGS of Lahendong Units 1-4. The plant is scheduled to be commissioned at the end of the same year. This will increase the efficiency of power generation in the Lahendong area since the power produced using excess brine (hot water) from the reservoir will be used for the SAGS instead of using electricity generated from Units 1-4. The success of this project will incentivize the development of renewable energy in the country. PT PLN is looking forward to further collaboration with Yokogawa.2PLN Lahendong Geothermal Power Plants / IndonesiaCustomer SatisfactionThe design and structure of the CENTUM CS 3000 and CENTUM VP systems for these geothermal power plants exceeded PT PLN’s high expectations. The use of the same HMI in both systems allows for complete consistency in the monitoring and control of the power plants and turbines at both plants. PT PLN greatly appreciates having the ability to automatically execute flawless plant and turbine startups and shutdowns.
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