Application of centralized control operation technology of generator set in thermal power plant
Computer technology, as an iconic technology for mankind entering the 21st century, has gradually derived technologies such as microprocessors and integrated circuits, and has generated centralized control operating systems, which are widely used in various industries. In the daily production of thermal power plants, traditional manual control methods and primary computer control systems cannot achieve unified control of the unit, and a lot of manpower and financial resources are wasted, and the unit operation efficiency cannot be guaranteed. Through the application of centralized control operation technology, since integrated control can be realized on a unified platform, power generation costs and energy consumption are greatly reduced, which is in line with the concept of energy conservation and emission reduction in today's society. However, in practical applications, the centralized control operation technology of generating units is not perfect, and adjustments need to be made to the actual operating conditions of thermal power plant units so that the effectiveness of centralized control operation technology can be brought into play. 1 Overview of the centralized control operation technology of generating units This technology is also known as DCS (Distributed Control System). DCS is a technology evolved based on large-scale industrial automation. As a new comprehensive control system, its internal Control requirements are also very complex. DCS is more advanced than traditional control systems. Through the use of powerful microprocessors, the daily operation control function of the generator set is realized, so as to achieve scientific operations and decentralized control functions. DCS technology integrates Control control technology, computer technology, software technology, communication technology, etc., which has great advantages in the field of electrical equipment management. It can not only achieve remote control, remote supervision, danger early warning, but also automatic processing and no people. On duty and other functions. In the practical application of DCS system, it is not only convenient at the operation level, but also can ensure the safety of the entire power generation system, which is an important driving force for the development of thermal power plants. 2 The operating conditions and modes of the centralized control operation technology of the generator set The DCS system is still in the initial application stage. There are certain loopholes in the actual application and it is easily affected by natural factors. This requires clear DCS operating conditions and mastering different control modes. In this way, the pertinence of DCS system application can be ensured. Its main manifestations are as follows: 2.1 Operating conditions Ensuring the normal operation of the DCS system is a prerequisite for the realization of the technical functions and an important channel to ensure the normal and uninterrupted operation of the equipment. It is necessary to ensure the safety of the system and do a good job of grounding. It can be known from practical applications that the DCS system is easily affected by external factors, such as voltage fluctuations, electromagnetic interference, software programming, etc. Therefore, when installing the DCS system, relevant protection needs to be performed, and at the same time, the operating quality of the operating equipment must be guaranteed. In addition, the safety of grounding must be guaranteed during the operation of the DCS system. If there is a fluctuation in the power supply of the corresponding power supply device of the system, it is necessary to switch the power supply to prevent the entire system from affecting the unit operation and stopping operation. Under normal circumstances, the control room and the electronic room use an air conditioner, but the air conditioner mostly adjusts the indoor temperature and cannot adjust the humidity. This easily causes static ions. In a long-term static environment, the circuit board in the DCS system is very useful. It may be wet, which may cause problems such as short circuit in the system and severely burn the motherboard and CPU. Therefore, in the process of using DCS, the quality of each component must be guaranteed. 2.2 DCS control mode The DCS system is a centralized control system, but it can be divided into multiple control modes based on different types of power generators, which are mainly reflected in: (1) Hierarchical ladder mode. In this mode, the unit control process is divided into multiple stages for segmented operation, and the control work for each stage is completed. (2) Integrated control mode. This mode mainly adopts communication measures and communication systems to achieve the control of the entire system. By adopting the integrated platform to realize the centralized control operation of the unit, a multi-modal and multi-interface control system is formed. This system can complete the control of each connected device on one platform, which has the same function as the gateway, and realizes the coordinated operation of the entire system. (3) Distributed control mode. This mode is to implement a distributed management mode in the same system to ensure the independence of each subsystem operation. Decentralized unit control is also called layered control, which can comprehensively improve the control capability of the generator set and reduce the difficulty of the entire system operation. 3 The centralized control operation technology of generating units in the operation of thermal power plants The application of DCS systems in thermal power plants is mainly manifested in three levels: technical management, system management, and heat engine protection systems. Only by fulfilling this requirement can DCS systems be ensured Quality to ensure the safe and efficient operation of thermal power plants. Its main performances are as follows: 3.1 Technical management To fully utilize the effectiveness of the DCS system, it is necessary to do a good job of technical management, which mainly includes the hardware, software, transmission measurement switches, cables and other related institutions of the DCS system. The DCS system is an integrated composition model. If any link in the DCS system has a problem, it will affect the normal operation of the entire unit control system, which will seriously cause damage to electrical equipment. This requires comprehensive management and maintenance work in the full operation of the DCS system. Usually, sensing technology and wireless network technology can be used to implement equipment monitoring. By setting sensors on the bus line and terminal equipment, and setting operating parameter thresholds on the control software, once the actual operating parameters of the equipment exceed the preset thresholds, then It will automatically adjust the equipment operating parameters and automatically send out alarms to ensure the operating efficiency of the entire generator set. 3.2 System Management In the process of using the DCS system, it is necessary to do a good job of system management. Since the DCS system mainly relies on the CPU (Central Processing Unit), only by ensuring that the performance of the Central Processing Unit meets the standard and cooperates with high-capacity memory hardware, can it realize a large-capacity, high-security, and practical central control system. In the past, because staff paid too much attention to the maintenance and management of hardware equipment, they ignored the importance of software maintenance and upgrades and lacked awareness of system software management. There are also some managers who have higher operation authority in the DCS system and can modify the system settings, thus causing great damage to the centralized control system. So while maintaining the hardware of the centralized control system, we must also pay attention to the management of the software. During system maintenance, the information collected by the system needs to be backed up to an independent hard disk or in the cloud, and the system is regularly maintained for upgrades. It adopts a modular system composition and establishes an open interface to enable function expansion. Unified and effective management model. 3.3 Thermal engine protection system The thermal engine protection system combines the relevant information of the DCS system database to evaluate the operating status of the generator set. The heat engine protection system can ensure the safety of the unit and the personal safety of the workers in the production of the thermal power plant. The system can directly control the actual operating status of the generator set, that is, the thermal engine protection system can detect the abnormal situation at the first time when the generator set runs out of failure. By comparing and analyzing the database information, if it is an emergency issue, it will automatically control The generator set is shut down safely to avoid the expansion of abnormal problems affecting the entire system or auxiliary equipment. The linkage between the thermal engine protection system and the monitoring system requires the setting of the database information value (safe operation value) and is divided into two judgment phases. The first is an abnormality. When this abnormality is found, it will automatically alarm and wait for the staff to maintain it to keep the generator set running. It is a major abnormality. In addition to the alarm, the generator will automatically cut off the power to ensure safe operation. After the emergency situation of the generator set operation is resolved, the heat engine system needs to be turned on immediately to protect the electromechanical equipment. Setting the safety value needs to be set by the heat engine manufacturer and the thermal power plant technicians. If it is necessary to change the safety data in the database, it is necessary to negotiate with the equipment manufacturer and superior management personnel, and carry out under the conditions allowed by the two. If there are performance changes, replacements and wear of the generator set, it is necessary to change the safety operation data at the same time. 4 Conclusion In summary, with the continuous development of China's science and technology, today's thermal power plant generating units are moving towards integration. As an important technology for the intensive development of thermal power plants, the centralized control operation technology of power plant units must be mastered in actual use, understand the main operating modes, and do a good job of technical management, system management, and thermal engine protection system work. In this way, the technical efficiency of centralized control operation of the generator set can be brought into full play.