PID prediction function-based excitation control method

Abstract

The invention discloses a proportional-integral-differential (PID) prediction function-based excitation control method, which is used for an excitation control system for a synchronous generator. By combining characteristics of PID and prediction function control, a PID form-based prediction function controlled target function is provided, and the optimized controlled quantity is obtained by optimized calculation, and is taken as a control end input signal of a silicon controlled (or a full-control device) in the excitation control system so as to control the excitation current of the synchronous generator and further influence the terminal voltage thereof. An excitation controller acquired by the method has structural characteristics of proportion, integral and differential in a broad sense, has respective advantages of the PID and the prediction function control, and is convenient to implement. The method overcomes the defects that the conventional prediction control method has high on-line calculated amount and the PID control method has a limited regulating range, and is a novel and effective control strategy for stabilizing a power system.

Description

technical field [0001] The invention relates to an excitation control method, in particular to an excitation control method based on a PID predictive function, which is used in a synchronous generator excitation control system. Background technique [0002] Excitation control of large synchronous generators is one of the most effective and economical means to improve the dynamic quality and transient stability of power systems. In the 1960s, the use of excitation control to improve the stability of the power system made a breakthrough in North America. my country also introduced this technology in 1976. At this stage, the main control methods used are PID (proportional integral differential control), PSS (power system Stabilizer), LOEC (Linear Optimal Excitation Control) and NOEC (Nonlinear Optimal Excitation Control) etc. These methods have achieved certain results in power system stability control to varying degrees, especially the control strategy combining PID and PSS. ...

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Problems solved by technology

The power system is also difficult to establish an accurate mathematical model, but at the same time it is a fast system. The traditional predictive control has a large amount of online calculation and poor real-time performance, so it is not suitable for the excitation control of the power system.

However, there is no literature or report on the application of the method of combining PID and predictive function control to the control of synchronous generator excitation system.

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