Method for emulating main servo of hydrogovernor

A technology of main servomotor and simulation method, which is applied in the direction of hydropower, machine/engine, instrument, etc., can solve the problems of large error and poor simulation accuracy, and achieve the effect of clear physical meaning and high simulation accuracy

Active Publication Date: 2009-03-11
SHAANXI ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] The purpose of this invention is to provide a new simulation method for the main servomotor of the hydraulic turbine governor used in the calculation of the power system, which solves the problem of the calculation of the existing power system The simulation method of the main servomotor of the turbine governor used in the paper has poor simulation accuracy, and the technical problem is that the error is large in the case of large frequency fluctuations

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  • Method for emulating main servo of hydrogovernor
  • Method for emulating main servo of hydrogovernor
  • Method for emulating main servo of hydrogovernor

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Embodiment Construction

[0027] The main servomotor emulation method of the present invention specifically comprises four steps, is respectively amplifying step (referring to figure 2 or image 3 first block in ), the hysteresis step (see figure 2 second module in ), servomotor speed limit step (see figure 2 the third module in or image 3 second block in ), the integral clipping step (see figure 2 The fourth module in or image 3 the third module in ).

[0028] Factor T of the amplification step y is the reaction time constant of the servomotor.

[0029] The hysteresis step refers to the deadband and main servomotor regulation hysteresis due to the amount of lapping of the main pressure distribution valve.

[0030] The speed limiting step of the servomotor means that the speed of the servomotor is limited by the fastest opening and closing time, which is determined by testing the fastest opening and closing time of the servomotor, and the speed limit v in the opening direction max =1 / T f , t...

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Abstract

The invention relates to a simulation method of a main servomotor of a speed governor of a hydraulic turbine, and solves the technical problems that in the existing electric system calculation, the adopted simulation method of the main servomotor of the speed governor of the hydraulic turbine has poor veracity and big error when frequency fluctuation is large. The method includes an amplifying step, a servomotor speed amplitude limiting step and an integration amplitude limiting step, wherein, the amplifying step is that the amplification of an input signal is carried out and a relative speed of a follow-up system is obtained, the servomotor speed amplitude limiting step is that speed limiting to the main servomotor is carried out, and the integration amplitude limiting step is that the relative speed of the main servomotor is integrated and a relative displacement value of the main servomotor is obtained, and then the limiting to the displacement of the main servomotor is carried out according to the relative displacement value. The method can theoretically explain the operation process of every step of the main servomotor and every step and parameters have clear physical meanings; every parameter can be determined by practical measurement or parameter identification; the method has the advantages of being capable of simulating primary frequency modulation, the increase and decrease of load and large fluctuation modulation with higher precision degree.

Description

technical field [0001] The invention mainly relates to a simulation method for a main servomotor of a governor of a water turbine, which is used for the stability analysis and calculation of an electric power system. Background technique [0002] The turbine governor is the most important control component of the hydroelectric generating set, and the main servomotor is the actuator of the governor. The correctness and accuracy of the simulation method are directly related to the results of the power system simulation calculation. At present, the simulation method used in the general simulation analysis and power system calculation software is shown in Figure 1. This simulation method is relatively simple and does not take into account the constraints in the movement process of the main servomotor. The physical meaning is not clear, which affects its simulation. Accuracy, larger errors will appear in the case of large frequency fluctuations. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50F03B15/00
CPCY02E10/226Y02E10/20
Inventor 李华万天虎张江滨
Owner SHAANXI ELECTRIC POWER RES INST
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