A tuning method for pid parameters of generator excitation system

Abstract

The invention provides a PID parameter setting method of a power generator excitation system. The PID parameter setting method is characterized by comprising seeking a fluctuation point by a pure proportional control mode under a no-load rated voltage state of a power generator during actual running; multiplying a proportional gain value VP' of the fluctuation point by a coefficient n to be used as a proportional gain value VP of a proportional gain parameter P set by a PID parameter of the power generator excitation system; measuring a value Ta' of an oscillation divergence convergence pointof a control signal output from a PID operator by a mode that an integral time parameter I in the PID parameter is gradually reduced, and multiplying the value Ta' by a coefficient m to be used as a time constant value Ta of the integral time parameter I set by the PID parameter of the power generator excitation system; and setting a derivative time parameter D set by the PID parameter of the power generator as 0. The PID parameter is set by observing the change of a PID control signal obtained by operation of a PIC controller under the no-load rated voltage state of the power generator duringactual running, the PID parameter of the power generator can be rapidly and accurately set, the optimal effect during running is truly achieved, the response time is rapid, and no oscillation is generated.

Description

technical field [0001] The invention relates to a PID controller parameter tuning method, in particular to a PID controller PID parameter tuning method applied to a generator excitation system Background technique [0002] In the prior art, PID tuning of the generator excitation system is very difficult, and the PID parameters can only be set by the step method under the no-load state of the generator, a certain voltage is raised, and the second-order response attenuation oscillation period is observed, and the PID is modified repeatedly based on experience parameters, not only the efficiency is low, but also the parameter setting is extremely inaccurate. This kind of small-scale step method is difficult to truly reflect the best response ability of the PID parameters of the generator under rated load, which will cause the system to respond when the load fluctuates greatly. If the control is not good, the response effect is poor, which seriously affects the power grid. Smal...

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Problems solved by technology

[0003] Large and medium-sized generators cannot be loaded to do AVR dynamic PID parameter setting, and large attenuation and shock tests are not allowed. Especially for hydro-generators, due to the large difference in water head, the speed of the generator is different, and the difference in volume and inertia is large. The generator must set the PID parameters at the generator site, the workload is heavy and the tuning effect is not good, once the PID parameter setting is wrong, it will seriously affect the operation of the generator

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