Sliding mode-based hydro turbine governing system dead zone nonlinear compensation method

A technology of nonlinear compensation and speed regulation system, applied in control/regulation system, general control system, mechanical equipment, etc., can solve problems such as the inability to guarantee the stability of the turbine speed regulation system, achieve strong real-time performance, ensure stability, cost reduction effect

Inactive Publication Date: 2014-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] Aiming at the insufficiency mentioned in the above background technology that the existing control method cannot guarantee the stability of the turbine speed control system with dead zone nonlinearity, the present invention proposes a sliding mode based dead zone nonlinear compensation method for the turbine speed control system

Method used

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  • Sliding mode-based hydro turbine governing system dead zone nonlinear compensation method
  • Sliding mode-based hydro turbine governing system dead zone nonlinear compensation method
  • Sliding mode-based hydro turbine governing system dead zone nonlinear compensation method

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Embodiment

[0145] The structure diagram of the hydroelectric power system is as follows figure 1 shown. By measuring and consulting the equipment manual, the parameters of a hydroelectric generator set using a mixed-flow generator set under a certain working condition are obtained as , , , , , , , , , . Based on engineering experience and understanding of the system to be controlled, it is obtained by trial and error . Further through model conversion, the matrix in the state equation of the system can be obtained and matrix They are:

[0146] ;

[0147] Take the expected pole in the Ackermann formula as , , , the sliding mode plane coefficient can be obtained for . According to the performance indicators of the control system, determine the switching control parameters , . Finally, the sliding mode governor of the hydroelectric generating set is determined as .

[0148] Take the relevant parameters of the dead zone nonlinear compensato...

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Abstract

The invention discloses a sliding mode-based hydro turbine governing system dead zone nonlinear compensation method in the technical field of hydro turbine control. The method comprises the following steps of: constructing a state space model for a hydro turbine governing system, and introducing an additional state variable; designing a sliding mode governor, and making an ideal hydro turbine governing system approximately stable by regulating the controlling quantity of the sliding mode governor; and designing a dead zone nonlinear compensator to compensate dead zone nonlinearity of an actual hydro turbine governing system. By the method, the automation level of the hydro turbine governing system is improved, the safety of a set is improved, the mechanical wear of the set is reduced, the equipment maintenance cost is reduced, and the economic performance of a hydro electric generating set is improved.

Description

technical field [0001] The invention belongs to the technical field of water turbine control, and in particular relates to a non-linear compensation method for a dead zone of a speed regulating system of a water turbine based on a sliding mode. Background technique [0002] The hydraulic turbine speed control system is a complex system coupled with hydraulic, mechanical and electrical phases. It can automatically adjust the speed of the hydro-generator unit to keep the unit running within the allowable deviation of the rated speed to meet the power frequency quality requirements of the grid. . The dead zone nonlinearity is included in the turbine speed control system, which is mainly manifested in the fact that the unit speed change is not sensitive enough to the small signal of the speed control system. If it is not compensated, it will seriously affect the stability of the water turbine speed control system. Usually, the water wheel speed control system adopts the PID spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B15/00G05B13/04
CPCY02E10/226Y02E10/20
Inventor 钱殿伟张博雅刘向杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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