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Water turbine speed regulator PID parameter optimizing method and system

An optimization method and technology of speed control system, applied in the direction of machine/engine, mechanical equipment, hydropower, etc., can solve problems such as optimization method of PID parameters of speed governor without damping performance of hydraulic turbine speed control system

Active Publication Date: 2017-12-15
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +3
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Problems solved by technology

However, in the context of the interconnection of large-scale power grids, the existing PID parameter optimization methods for governors mostly focus on the dynamic response performance of the PID controller to improve the control quality of the governor, but do not focus on improving the speed of the turbine. Optimization method of governor PID parameters with system damping performance as optimization target

Method used

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  • Water turbine speed regulator PID parameter optimizing method and system
  • Water turbine speed regulator PID parameter optimizing method and system
  • Water turbine speed regulator PID parameter optimizing method and system

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Embodiment 1

[0053] The invention provides a PID parameter optimization method of a water turbine governor for suppressing ultra-low frequency oscillation of a power system, including:

[0054] 1) Establish a model including the water turbine speed control system, water turbine and generator, such as figure 1 shown. Take the turbine generator of an actual hydropower station as an example to illustrate.

[0055] 1-1), the block diagram of the PID controller model of the turbine governor is as follows figure 2 Shown, where, s is the Lagrangian operator, K p1 、K i1 、K d1 are the PID parameters of the governor, T d1 is the time constant of the differential link, b p is the permanent slip coefficient, Δω is the speed deviation, Y ref , Y PID Respectively for the opening given value and the PID controller output opening value. The transfer function of the PID controller of the turbine governor is as follows:

[0056]

[0057] The block diagram of the hydraulic actuator model is as ...

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Abstract

The invention discloses a water turbine speed regulator PID parameter optimizing method and system. The method comprises the steps that the speed regulator PID parameter optimizing overall objective function J restraining ultra-low frequency oscillation is obtained, optimization is conducted through the optimization algorithm, the optimal PID parameter is sought, and the overall objective function is minimal. According to the method, the value obtained after weighting of the frequency step response deviation absolute value integral and speed regulating system damping at the focused ultra-low frequency band integral serves as the optimization objective, the obtained speed regulator parameter integrates the speed regulator adjusting performance and damping level at the same time, accordingly, the problem of ultra-low frequency oscillation caused by speed regulator negative damping is solved, and the speed regulator adjusting dynamic quality is combined.

Description

technical field [0001] The invention relates to the technical field of hydraulic turbine regulation, in particular to a PID parameter optimization method and system for a hydraulic turbine governor. Background technique [0002] The basic task of the turbine governor is to respond to the change of grid frequency or load, participate in the primary frequency regulation of the system, adjust the power output of the generator set, restore the active power balance of the system, and maintain the frequency stability of the system. At present, in the control of hydropower stations, a proportional-integral-derivative (PID) governor is usually used to form a closed-loop hydraulic turbine regulation system to ensure the safe and stable operation of the speed regulation system. [0003] Whether the control parameters of the governor are properly selected directly determines the quality of the regulating performance of the governor. Unreasonable parameter selection will lead to poor p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B15/00
CPCF03B15/00F05B2260/96F05B2270/101F05B2270/706Y02E10/20
Inventor 陈刚史华勃汤凡常晓青丁理杰张华
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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