The thermal storage system is an essential part of the trough solar thermal
power generation system. Due to the strong randomness, intermittency, and
volatility of solar energy resources, to further improve the system?s
overall reliability to meet the needs of variable operating conditions, the
paper optimizes the control strategy of the trough solar heat storage
system. Taking the molten salt heat storage medium in the oil/salt heat
exchanger, the core equipment of the heat storage system, as the critical
research object, the article adopts proportional, integral, and
differential (PID) control theories. It builds the system in the
MATLAB/Simulink simulation environment mathematical model. We use the
critical proportionality method to determine many critical parameters in the
control system, tune the proportional coefficient, integral time, and other
physical quantities in the PID controller, and analyze the proportional
control, proportional-integral control, PID controls the respective dynamic
response characteristics of these three different control systems. The
simulation and comparative analysis results show that: compared with the
other two control methods, PID control can effectively weaken the heat
storage system oscillation caused by external disturbance, its dynamic
response speed is faster, the adjustment time is shorter, and it can meet
the requirements of operational stability. The paper adopts PID control,
which reduces the control difficulty of the trough solar heat storage system
and improves the adaptability to changes in external meteorological
resources. The research results have particular guiding significance at the
academic and engineering levels.
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