KEYWORDS: Control systems, Monte Carlo methods, Device simulation, Design, Water, Safety, Gadolinium, Systems modeling, Measurement devices, Industrial applications
This paper focuses on the drum water level control of a heat recovery boiler, where drum water level is influenced by many factors such as steam flow and feed water flow. To enhance the control performance of drum water level system, a modified active disturbance rejection control (MADRC) is proposed for the integral system, where the inertial link is compensated by adding a compensation part for the control signal. Then the cascade control structure based on MADRC is applied to the drum water level system. Compared to other comparative controllers, simulation results show that MADRC obtains obvious advantages in terms of tracking performance, disturbance rejection ability, and measure noise rejection ability, with satisfactory robustness.
KEYWORDS: Turbines, Frequency modulation, Control systems, Mathematical optimization, Databases, Power grids, Monte Carlo methods, Modulation frequency, Frequency response, Data modeling
Due to the advantages of cleanness, high efficiency and rapid start-up, gas turbines play an important role in peak shaving and frequency modulation in China's power supply. The primary frequency modulation capability of gas turbines is of great significance to the safe operation and frequency stability of the power grid. To handle the control challenges of gas turbine primary frequency modulation, such as loop coupling and large overshoot, a data-driven proportional-integral (PI) control strategy is proposed for the gas turbine primary frequency modulation system, and a reasonable parameter tuning method is provided. The stability of data-driven PI is discussed by analyzing the distributions of data-driven PI parameter in the stability region. Finally, the proposed method is applied to the primary frequency modulation control of a typical heavy-duty gas turbine unit. The simulation results show that the gas turbine unit with the proposed method can obtain the best control performance of the primary frequency modulation with good robustness. The proposed method also has good practical application potential.
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