|Various Power Plant Control Sub-Systems|
|Various Power Plant Control Sub-Systems|
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Four Main Objective of Power Plant Automation
1. Automatic Detection
2. Automatic Modulation
3. Remote Control and Program Control
4. Automatic Protection
Sub-Control Functions Matrix
DAS (Data Acquisition System)
FSSS consist of two types of system: Burner Management System and Furnace Safeguard Supervision System. The design of FSSS system is accord with US standards, NFPA8502 National Fire Protection Association Standard and other relevant technical standards.
The electrical system control for the DCS system is divided into two subsystems:-
The common electrical system is “common” and shared by the two generator units. Each generator is controlled by its own DCS system. The DCS system controlling of one of the generator unit shall NOT affect the normal operation of the other generator unit. The DCS systems of the two generator units has full supervision and control, however, the DCS systems has to be interlock to ensure only one DCS system has the operational and control rights. The operational and control rights can switch in between the two DCS system smoothly.
The steam turbine digital electro-hydraulic control system is the most important functional subsystem of the turbine power generator. It utilized pure electric and high-pressure fuel-oil or low-pressure turbine oil hydraulic servo system component forming the Digital Electro-Hydraulic Control System (DEH). The control system is highly reliable and easy to operate, easy to maintenance, flexible, with features and design focusing on the redundancy of key components, self-diagnostic on every sub-modules, and risk reduction.
The primary function of the DEH system provides the load and speed control of the turbine. It also includes a number of other parameters of control such as over-speed protection, thermal stress, monitoring theturbine generator parameters, the start/stop sequence control, and other functions. In addition, DEH system also fully adapt to the other incident and events occurring during the process. This includes unit/crew incident working conditions (such as RB), start/stop running process, and other process requirements.
Based on the thermal status of the turbine, turbine usage, inlet condition, and turbine life consumption, the DEH system determines its related speed-up ratio and automatically adjusts gradually to its required speed.
DEH system provides automation control from "initial load” to “full load”. DEH system can provide fast respond to the request of the primary frequency controller. There are three control modes: “Valve Control”, "Pressure Control" and “Power Control”.
In order to improve the dynamic stability performance or the over-speed of the steam turbine generation during system power failure, the DEH system set up following the rejection load control functions:
ATC system can coordinate with the following control system and realize the whole automatic control in start–up process of the turbine group.
DEH system accept the order and signal of Coordinate Control system, can realize the following modes safely and economically
DCS control system accords to the principle of step and layer control. When the upper control system is in trouble, it can change to the lower control system. The operator can also choose one operation mode. For example, Operator Automatic Operation mode; turbine automatic control.
With the improvement of the automation technology in power plant, it is crutial to collect, analysis and utilize production information. Therefore, SIS system has appeared. The role of SIS is to provide realtime information for the security andeconomical operation of the power plant.
Based on the experience of implementing power plant system, Hollysys Company has developed the Supervisory Information System for the plant level -- HOLLiAS SIS. It provides specialized solution for automatic production and management in the power plant.
Through the high-speed network, HOLLiAS SIS connects with DCS system of each generating sets, obtains the production date and equipment state of generating set in real time, set up unified production information database. It is easy to learn the operational state of generating sets equipment, analyze the operation and overhaul, cost of power plant, and offer information for economic operation management in power plant.
Along with the reform in electric power industry, it is the unceasing target of electric power enterprises to enhance production efficiency, working efficiency, and reduces operation cost with information technology. Therefore, Hollysys company has developed the Power Plant Management Information System HOLLiAS MIS that conformed to the reality of power enterprises.
This system absorbs advanced management though from home and abroad, in the practice of electric power enterprises, integrates the human resources, wealth, material, information together, enhances working efficiency with maximum and reduces the cost.
This system can realize the seamless connection with different DCS, and provides the solution for electric power industry from the automatic control floor of production to enterprise upper management. The system intends to improve enterprise management, improve the economic efficiency of enterprise, meanwhile improve and enhance the management level of enterprise, impels the modernization of management, serves for the ultimate objective, enhance the market competition ability and survivability.
Product planning and statistic, operation management, safety management, DCS gateway
Equipment account management, equipment reliability management, equipment defect, protection fix value and warning, Non-Leakage management
Fuel management, stock management, purchase management
Account management, Account Payment Management, Fixed Assets Management, Salary Management, Cost Calculation, teller management
Human resource management, Insurance management, environmental protection management, simulation chart management
OA system, Archives management
HOLLiAS MIS system is the comprehensive operation management system in electric power industry. It based on network platform of Intranet/Internet technology, uses the operation pattern of C/S, B/S, and is a management information system with advanced technology, practicable economy, reliable safety and excellent opening. It has implemented successfully in many electric power enterprises.
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