Fuzzy fractional order PID control method for speed regulating system of pump storage group

Abstract

The invention, which belongs to the field of precise modeling and control optimization of the hydro electric generating set of the power system, discloses a fuzzy fractional order PID control method for a speed regulating system of a pump storage group. On the basis of a fractional calculus and a fuzzy control theory, a fuzzy fractional order PID controller for a pump storage group is established; modeling of a speed regulating system of the pump storage group is carried out, wherein a regulator model, an approximate elastic water hammer model of a conduit system, a total-characteristic-curve-based pump turbine model, and a generator and load model are established; and then a controller parameter is optimized by using a provided parallel gravitation searching algorithm. According to the control method, requirements of hydroelectric energy system simulation, power system analysis, and optimized pump storage group control can be met to the greatest extent.

Description

technical field [0001] The invention belongs to the field of refined modeling and control optimization of hydraulic power generation units in electric power systems, and more specifically relates to a fuzzy fractional-order PID control method for a speed regulation system of a pumped storage unit. Background technique [0002] With the rapid development of my country's economy and society, the power load increases rapidly, and the peak-to-valley difference continues to increase. Insufficient peak-shaving capability will become a prominent problem restricting the development of the power system. With its unique operating characteristics of peak-shaving and valley-filling, pumped-storage power station plays the role of regulating load and maintaining the safe and stable operation of the power grid, and has gradually become an effective and indispensable means of regulation in my country's power system. However, there are two unstable areas in the overall characteristics of the...

AI Technical Summary

Problems solved by technology

The traditional pumped-storage unit modeling method only considers the dynamic characteristics of the pump-turbine in the stable region of the turbine, and simplifies the pump-turbine into an IEEE six-parameter model, which cannot accurately reflect the dynamic characteristics of the pumped-storage unit; at the same time, the traditional PID control The strategy cannot effectively adjust and control the strong nonlinearity of the pumped storage unit, especially when the low head unit is operating in the "S" area, the PID control can not solve the difficulty of low head turbine start-up and grid connection, and the low head phase adjustment and forwarding are not good. Stability, unit no-load oscillation and other issues

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