Pumped storage and electrochemical energy storage combined participation power grid load frequency control method based on fractional order PID

Abstract

The invention discloses a pumped storage and electrochemical energy storage combined participation power grid load frequency control method based on fractional order PID. The method comprises steps: firstly, establishing a two-region reheating type turboset load frequency control model considering a nonlinear link; secondly, designing a fractional order PID controller; then based on two working modes of power generation and water pumping of the pumped storage power station, establishing a pumped storage and electrochemical energy storage combined two-region load frequency control model; and finally, establishing a demand response model, and analyzing the pumping / storage combined fractional order PID control effect under different degrees of demand response control. According to the pumping / storage combined fractional order PID frequency control method, nonlinear factors existing in an actual power system are considered, and the reliability of power grid frequency control and the operation stability of the power system are further improved through effective combination of the fractional order PID controller and pumping / storage combined load frequency control.

Description

technical field [0001] The invention belongs to the technical field of combined energy storage load frequency control, and in particular relates to a fractional-order PID-based method for combining pumped storage energy and electrochemical energy storage to participate in power grid load frequency control. Background technique [0002] As the proportion of distributed power generation in the power grid is getting higher and higher, its power generation is affected by changes in natural resource factors such as wind and light, and there are problems such as difficult prediction, difficult control, and difficult scheduling. Large-scale grid-connection has an increasing impact on power quality and transient stability of the grid. At the same time, the energy structure is gradually transforming, and it is necessary to deal with the challenges brought by the inherent volatility and randomness of the renewable energy power generation system to maintain the stability of the grid fr...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a fractional-order PID-based pumped storage and electrochemical energy storage joint participation in the power grid load frequency control method, which can solve the problem of unit reserve capacity in the face of complex nonlinear systems and load disturbances Insufficient, slow response speed, poor coordination of control methods, etc., to enhance the anti-interference performance of the unit, improve the dynamic response of the system's secondary frequency modulation, and efficiently realize the safe and stable operation of the system

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