Synchronous Generator Excitation Control Method

Abstract

The invention discloses a synchronous generator excitation control method. A shutter sampling mode is employed, A voltage and a current output by a generator are sampled, and a non-linear robustness control algorithm is employed to calculate an excitation driving signal; the shutter sampling mode means one or more times of sampling is carried out in each rotating speed cycle based on a generator rotating speed signal, and voltage and current instantaneous value data is sampled. The defect of long sampling delay time of a traditional voltage sampling mode is overcome. The sensing speed of voltage transformation of an output end of a generator is raised fundamentally, and therefore the excitation control speed is raised. The non-linear robustness control algorithm means that with a set generator output voltage goal value Uref and various characteristic parameters of a generator as basic parameters, combined with voltage and current instantaneous value data collected in a shutter sampling mode, an excitation driving signal u is calculated. The method is suitable for non-linear characteristics of a synchronous generator and ensures stable output voltage of a synchronous generator.

Description

technical field [0001] The invention belongs to the field of generator control, and in particular relates to an excitation control method of a synchronous generator. Background technique [0002] The control process of the existing synchronous generator excitation controller is usually to measure the generator output voltage and compare the set voltage, and control the excitation current to complete the control work. The voltage measurement usually adopts DC voltage sampling or AC voltage sampling, because the voltage sampling delay The time is large, which leads to the slowing down of the excitation control speed, which affects and restricts the power supply quality of the synchronous generator. [0003] The control method usually adopts the PID control method. This control method cannot adapt to the nonlinear characteristics of the synchronous generator, and will cause a large control overshoot, and the control time is prolonged, and the stability of the excitation control...

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Problems solved by technology

[0002] The control process of the existing synchronous generator excitation controller usually measures the output voltage of the generator and compares the set voltage, and controls the excitation current to complete the control work. The voltage measurement usually adopts DC voltage sampling or AC voltage sampling. Due to the voltage sampling delay The time is large, which leads to the slowdown of the excitation control speed, which affects and restricts the power supply quality of the synchronous generator

[0003] The control method usually adopts the PID control method, which cannot adapt to the nonlinear characteristics of the synchronous generator, and will cause a large control overshoot, and the control time will be prolonged, and the stability of the excitation control will be weak.

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