An automatic control method of heat extraction system in thermal power unit

2017 ◽  
Author(s):  
Zeng Deliang ◽  
Wang Yaohan ◽  
Chen Yanqiao ◽  
Hua Shan
Keyword(s):  
Automatic Control ◽  
Power Unit ◽  
Control Method ◽  
Thermal Power ◽  
Heat Extraction ◽  
Extraction System

Concept of Triple Heat Exchanger-Assisted Solar Pond Through an Improved Analytical Model

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Sunirmit Verma ◽  
Ranjan Das
Keyword(s):  
Analytical Model ◽  
Power Output ◽  
Heat Exchangers ◽  
Thermal Power ◽  
Convective Zone ◽  
Heat Extraction ◽  
Extraction System ◽  
Seepage Water ◽  
Solar Pond ◽  
Bottom Zone

A new three-zone heat extraction system and its analytical model for maximizing the thermal power output of salt gradient solar ponds against a given volume is proposed. The present study considers internal heat exchangers installed within the non-convective zone (NCZ), lower-convective zone (LCZ), and the ground below the pond. The work is validated against a simplified version of the model (eliminating ground and bottom-zone heat extractions) available in the existing literature. Contrary to the conventional practice of optimizing only the middle-zone pond thickness, here, the newly proposed expression is used to find ideal values of both the middle- and bottom-zone thicknesses of the pond along with its cross-sectional area. The present work acknowledges that although the three-zone heat extraction system is the best, yet if a choice for two-zone heat extraction is to be made between the NCZ–LCZ and ground–LCZ, then the former is a better alternative. The power output is observed to increase asymptotically with mass flow rates of the three heat exchangers. However, their values must lie much below their theoretical asymptotic limits and their selection is regulated by constructional and operational constraints. These involve a minimum pond depth to offset surface evaporation, ground seepage water loss, and constraints preventing turbulent flow in heat exchangers to reduce friction loss and pumping power. This work recommends using three heat exchangers instead of either one or two and provides cardinal guidelines to extract heat in an ideal manner for a fixed solar pond volume.

Inverse Response Control Method for Steam Temperature of Thermal Power Unit

1978 ◽  
Vol 11 (1) ◽  
pp. 81-88 ◽  
Author(s):  
T. Kitami ◽  
H. Mizutani ◽  
J. Fujimoto ◽  
T. Yamada ◽  
M. Uchida ◽  
...  
Keyword(s):  
Power Unit ◽  
Control Method ◽  
Thermal Power ◽  
Steam Temperature ◽  
Response Control ◽  
Inverse Response

scholarly journals SYSTEM ANALYSIS OF SCIENTIFIC-AND-TECHNICAL INFORMATION IN AUTOMATIC CONTROL SYSTEM OF POWER UNITS WATTAGE

2017 ◽  
Vol 60 (5) ◽  
pp. 446-458 ◽  
Author(s):  
G. T. Kulakov ◽  
K. I. Artsiomenka
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Power Unit ◽  
System Analysis ◽  
Continuous Process ◽  
Thermal Power ◽  
Technical Information ◽  
Active Power ◽  
Point Of View ◽  
Frequency Regulation

The production, transformation, transmission, distribution and consumption of electricity is one continuous process. The change of the load, i.e. the level of energy consumption, should cause a corresponding change in the level of generated energy. It means that the power system should be a balance of produced and consumed energy, taking into account technological cost of conversion, transmission and distribution. Otherwise, electric power quality indicators will be violated. For example, at infringement of balance of active power the frequency in the grid will have a value different from 50 Hz. One of the automatic devices on the lowest rung in the hierarchy of automatic dispatcher control system of frequency and power interchange is the system of automatic control of power units (SACPU). It is a comprehensive and complex device, which consists of several connected together simpler systems, governing all thermal power devices of a power unit. SACPU ought to regulate the active power of the unit and participate in primary frequency regulation in the network with a given accuracy and sensitivity; also, it ought to be adequately fast. At the same time, this device should be simple from the point of view of technical implementation, easy to use, allow one to maintain a high level of efficiency, reliability, durability and environmental performance of the units. To satisfy all these requirements (often conflicting) simultaneously, SACPU should have a certain structure, which depends on the composition and characteristics of heat power equipment of the power unit and on operating modes. The analysis of known SACPU have demonstrated that they are unable to fully provide the requirements of the modern standards for quality control of frequency and power, i.e. the SACPU models are still in need of structural and parametric optimization on the basis of the proximate methods developed at the Belarusian National Technical University.

scholarly journals Automatic control system of boiler thermal energy in thermal power plant based on artificial intelligence technology

2021 ◽  
Vol 25 (4 Part B) ◽  
pp. 3141-3148
Author(s):  
Yu Zeng ◽  
Fuchao Cheng
Keyword(s):  
Artificial Intelligence ◽  
Automatic Control ◽  
Control Method ◽  
Thermal Power ◽  
Influence Factors ◽  
Regulation System ◽  
Proportional Integral Derivative ◽  
Monitoring Method ◽  
Proportional Integral ◽  
Artificial Intelligence Technology

Thermal processes tend to have large inertia and hysteresis, non-linearity, and slow time-varying. Therefore, the fixed-parameter proportional integral derivative conventional regulation system cannot meet the higher and higher control requirements in production. Based on this research background, the paper proposes an automatic control method for thermal boiler steam based on artificial intelligence technology. Through the real-time monitoring of the boiler, the state monitoring method is used to estimate the influence factors of the boiler, and the estimated error output is artificially supplemented to realize the accurate control of the boiler. After being put on the market, it is found that the control method proposed in the article can overcome the randomness and inertia of the temperature and accurately realize the temperature control of the boiler. Moreover, compared with the traditional proportional integral derivative control, this method is more effective.

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