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Indonesian Power Plant uses Ethernet Networked DCS System to Upgrade Generators

業種 電力およびユーティリティ
関連製品 EDS-728 シリーズ
概要 The monitoring and control network at the Ombilin Steam Power Plant serves as the communication backbone for the DCS, and is the most critical network in the entire plant. The reliability of the network is enhanced considerably by using Moxa's EDS-726 modular Ethernet switches. In fact, all of the servers, work stations, and MTL MOST controllers are duplicated and connected to two independent communication networks formed by the EDS-726 Ethernet switches.
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Introduction
An increase in the demand for electricity was the driving force behind Indonesia's move to set up new and upgrade existing large-scale power plants at various locations around the country. The Perusahaan Listrik Negara (PLN) electric utility is a state-owned power company in charge of increasing the amount of electric power available to consumers. They achieved this by building new power plants and upgrading the effi ciency of existing plants. The company transmits and distributes electricity to more than 33.3 million residential, commercial, and industrial customers. Its 21,425 MW generating capacity comes from its own power plants, and is supplemented by independent power producers.

 

The Ombilin Steam Power Plant owned by PLN is located in Central Sumatra, and provides service to the West Sumatra regions. Construction on the plant is initiated in 1993, and commercial operations of Units 1 and Units 2 were started in 1996 and 1997, respectively. Recently, PLN devised a plan to upgrade the DCS of power generators by designing a faster and more reliable communication network. After the upgrade, the two coal-powered generators were able to produce a total of 200 megawatts of power.

 

System Description
The monitoring and control network at the Ombilin Steam Power Plant serves as the communication backbone for the DCS, and is the most critical network in the entire plant. The reliability of the network is enhanced considerably by using Moxa's EDS-726 modular Ethernet switches. In fact, all of the servers, work stations, and MTL MOST controllers are duplicated and connected to two independent communication networks formed by the EDS-726 Ethernet switches. In particular, each MOST controller has four Ethernet ports, which are connected in pairs to two independent backbone networks for double redundancy.

The plant's DCS monitoring network is used for process control and analysis to optimize the manufacturing process. It uses a three-level DCS system: (1) MTL MOST controllers collect output volume and environmental parameters such as temperature, pressure, and the status of water taps from I/Os, (2) Redundant historical servers automatically poll, analyze, and save the collected data from the controller to optimize the process, and (3) Workers at on-site operator stations can access the redundant historical servers to retrieve parameter settings, and then make adjustments manually.

By installing FTE (Fault Tolerant Ethernet) applications on each MOST controller and redundant HMI servers, the control network portion of the system is able to implement and benefit from the FTE features. However, considering the mission-critical nature of this control and monitoring network, network shut-downs and system crashes could be disastrous, and this condition should be avoided at all cost. The system integrator decided that Moxa's EDS-726 industrial-grade Ethernet switches were the right choice to provide the needed level of reliability. The EDS-726 switches come with a 5-year warranty and high MTBF to ensure long term, trouble-free operation in critical systems. One of the biggest advantages of using Moxa's EDS-726 switch is its media versatility and high port density design. The modular capability makes network planning easier since you can install up to 2 gigabit ports and 24 fast Ethernet (fi ber or copper) ports in one switch. The EDS-726 meets the demands of any industrial application, and also leaves room for future expansion.

Network System Diagram 
  

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