Control method for preventing power regulation oscillation of hydroelectric generating set
Control method for preventing power regulation oscillation of hydroelectric generating set
 CN 103,490,436 A
 Filed: 10/11/2013
 Published: 01/01/2014
 Est. Priority Date: 10/11/2013
 Status: Active Application
First Claim
1. a control method that prevents the vibration of Hydropower Unit power adjustments, is characterized in that, comprises the following steps:
 (1) power of the assembling unit is produced to the parameter adaptive controlling unit of nonlinear effects by increase unit head and guide vane opening in the Hydropower Unit power control circuit, reach unit and do not affect the regulation quality that power is controlled when the operation principal parameter changes greatly;
By calculating the adaptive factor of unit power adjustments, carry out the dynamic adjustments parameter of automatic calibration power of the assembling unit PID, adaptive factor is;
R=1×
f1(h)×
f2(V)??（
1）
Hhead;
The function that f1 (h)unit head forms power;
The function that f2 (V)unit guide vane opening forms power;
The power of the assembling unit control to adopt single loop PID regulative mode, and the power of the assembling unit adaptive factor of calculating is for P, I, D variable parameter control, or becomes the mode such as PID input deviation gain, realizes the adaptive control of the power of the assembling unit;
K _{p}=k1/R??（
3）
T _{I}=k2·
R??（
4）
T _{D}=k3/R??（
5）
Wherein, K _{p}, T _{i}, T _{d}be respectively proportionality coefficient, the time of integration, the derivative time of parallel connection type PID adjuster;
The control parameter of k1～
k3adjust;
The adaptive factor that Rpower of the assembling unit PID regulates;
For the control system without the PID variable element, adopt the deviation input outside PID to be multiplied by the adaptively correcting that R0/R realizes the unit operating mode, R0 is the adaptive factor calculated under the unit rated condition;
(2) by increasing the filtering link in the power of the assembling unit signal measurement link power of the assembling unit PID regulates, increase the damping in unit closedloop adjustment loop, avoid the resonant belt with electric network active and FREQUENCY CONTROL, make power of the assembling unit control more stable;
The measurement links of controlling in the power of the assembling unit adds filtering;
L _{PV}=Filter(L)??（
6）
Lpower of the assembling unit;
Filterfiltration module;
L _{pV}filtered the power of the assembling unit.
Chinese PRB Reexamination
Abstract
The invention discloses a control method for preventing power regulation oscillation of hydroelectric generating set. The method comprises the following steps of (1) by the provided parameter adaptive control links having relatively great influence on set power, such as additionally arranging a set water head in a hydroelectric generating set power control loop, realizing the purpose that regulation quality of power control cannot be influenced when an operation principal parameter of the set varies greatly; (2) by the provided means of additionally arranging a filtering link in the controlled parameter measuring link of hydroelectric generating set power regulation, increasing damp of a set closedloop regulation loop and avoiding a resonance band with an electric grid, thus enabling set power control to be relatively steady; and (3) by means of increasing the linear correction of water turbine guide vane opening control, improving water turbine opening linearization level and enabling the power regulation of the set to be relatively steady. The method has the remarkable advantages of being capable of greatly reducing electric system lowfrequency oscillation caused by power oscillation of the hydroelectric generating set, and improving safety and stability level of the set and the electric grid.

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1 Claim

1. a control method that prevents the vibration of Hydropower Unit power adjustments, is characterized in that, comprises the following steps:

(1) power of the assembling unit is produced to the parameter adaptive controlling unit of nonlinear effects by increase unit head and guide vane opening in the Hydropower Unit power control circuit, reach unit and do not affect the regulation quality that power is controlled when the operation principal parameter changes greatly; By calculating the adaptive factor of unit power adjustments, carry out the dynamic adjustments parameter of automatic calibration power of the assembling unit PID, adaptive factor is; R=1×
f1(h)×
f2(V)??（
1）Hhead; The function that f1 (h)unit head forms power; The function that f2 (V)unit guide vane opening forms power; The power of the assembling unit control to adopt single loop PID regulative mode, and the power of the assembling unit adaptive factor of calculating is for P, I, D variable parameter control, or becomes the mode such as PID input deviation gain, realizes the adaptive control of the power of the assembling unit; K _{p}=k1/R??（
3）
T _{I}=k2·
R??（
4）
T _{D}=k3/R??（
5）
Wherein, K _{p}, T _{i}, T _{d}be respectively proportionality coefficient, the time of integration, the derivative time of parallel connection type PID adjuster;
The control parameter of k1～
k3adjust;The adaptive factor that Rpower of the assembling unit PID regulates; For the control system without the PID variable element, adopt the deviation input outside PID to be multiplied by the adaptively correcting that R0/R realizes the unit operating mode, R0 is the adaptive factor calculated under the unit rated condition; (2) by increasing the filtering link in the power of the assembling unit signal measurement link power of the assembling unit PID regulates, increase the damping in unit closedloop adjustment loop, avoid the resonant belt with electric network active and FREQUENCY CONTROL, make power of the assembling unit control more stable; The measurement links of controlling in the power of the assembling unit adds filtering; L _{PV}=Filter(L)??（
6）
Lpower of the assembling unit; Filterfiltration module; L _{pV}filtered the power of the assembling unit.

Specification(s)