CN-116733661-B - Control method for opening analog quantity given mode of hydroelectric generating set monitoring system

Abstract

A control method for setting a mode of an aperture analog quantity of a monitoring system of a water turbine generator set is characterized in that an aperture increasing and decreasing pulse recognition program is newly added, a control logic is adopted, ① is adopted, if an aperture increasing pulse command is detected to be 1, the aperture analog quantity given value=an aperture analog quantity given value+a fixed step length, and otherwise, the aperture analog quantity given value is kept unchanged. ② If the opening subtracting pulse instruction is detected to be 1, the opening analog quantity given value=the opening analog quantity given value-the fixed step length, otherwise, the opening analog quantity given value is kept unchanged. When other control modes are converted into opening analog quantity setting modes, the opening given feedback value sent by the current speed regulator is given to the opening analog quantity given value as an initial value. The invention can improve the opening degree of the guide vane and the active power adjusting speed, improve the stability and the reliability of equipment, reduce intermediate links and fault points, reduce the fault rate of the equipment and ensure the safe, stable and high-quality operation of a unit and a power grid.

Inventors

• TU YONG

Assignees

• 中国长江电力股份有限公司

Dates

Publication Date

20260505

Application Date

20230523

Claims (3)

1. 1. A control method for a given aperture analog quantity mode of a hydroelectric generating set monitoring system is characterized by comprising the following steps of: The opening increasing and decreasing pulse recognition program adopts the following control logic: ① If the opening increasing pulse instruction is detected to be 1, the given value of the opening analog quantity=the given value of the opening analog quantity+the fixed step length, otherwise, the given value of the opening analog quantity is kept unchanged; ② If the opening subtracting pulse instruction is detected to be 1, the given value of the opening analog quantity=the given value of the opening analog quantity-the fixed step length, otherwise, the given value of the opening analog quantity is kept unchanged; The initialization program for increasing the analog quantity given value adopts the following control logic: when the other control modes are converted into opening analog quantity set control modes, the opening set feedback value sent by the current speed regulator is given to the opening analog quantity set value as an initial value.
2. 2. The method for controlling the opening analog quantity given mode of the monitoring system of the water turbine generator set according to claim 1, wherein the other control modes comprise an opening pulse quantity given control mode, a power analog quantity given control mode and a power pulse quantity given control mode.
3. 3. A control method for a given mode of opening analog quantity of a hydroelectric generating set monitoring system is characterized by comprising the following steps: step 1, a controller detects whether a monitoring system is in an opening analog quantity given mode, if so, the step 2 is entered, and if not, a non-opening mode control method is adopted; Step 2, the controller detects whether the monitoring system is firstly switched into an opening analog quantity set mode, if yes, the opening analog quantity set value=the opening set feedback value sent by the speed regulator enters step 3, if not, the controller enters step 3; Step 3, the controller detects whether the opening increasing pulse instruction is 1, if so, the opening analog quantity given value=the opening analog quantity given value+the fixed step length is entered into step 4, if not, the opening analog quantity given value is kept unchanged, and the step 4 is entered; step 4, the controller detects whether the opening subtracting pulse instruction is 1, if yes, the step 5 is entered, if not, the opening analog quantity given value=the opening analog quantity given value-the fixed step length is entered, and if not, the opening analog quantity given value is kept unchanged, the step 5 is entered; and 5, the controller transmits the opening analog quantity given value to the speed regulation system in real time through the AO module, and the step 1 is returned.

Description

Control method for opening analog quantity given mode of hydroelectric generating set monitoring system Technical Field The invention relates to the technical field of hydroelectric generating set monitoring, in particular to a control method for a given mode of opening analog quantity of a hydroelectric generating set monitoring system. Background In the hydroelectric generation process, the hydraulic turbine adjusting system needs to accurately complete important core tasks such as rotating speed adjustment, opening degree adjustment, power adjustment and the like of a unit, the opening degree of a guide vane of the hydraulic turbine is controlled by controlling the rotating action of a relay ring, the aim of adjusting the flow rate of water flowing through a volute of the hydraulic turbine is achieved, and finally, the key indexes of the electric energy quality of a controlled object, namely the frequency and the active output, meet the requirements of a power grid. The adjustment performance of the unit is closely related to whether the power grid can safely and stably run with high quality. Especially, in a single-machine large-capacity unit, once the water turbine adjusting system is poor in adjusting quality, the electric energy quality of a power grid is seriously affected. How to coordinate and cooperate the monitoring system with the water turbine adjusting system, so as to improve the adjusting quality and ensure the safe, stable and high-quality operation of the giant unit is a subject worthy of attention and study. The monitoring system under the traditional hydroelectric generating set opening mode often adopts a power closed-loop conventional pulse regulation mode to output an opening increasing and decreasing pulse water turbine regulating system so as to realize the control of the hydroelectric generating set opening. The control mode has the problem that the opening degree of the guide vane and the active power adjusting speed are low. In the prior art, the interpolation algorithm and the correction proportion algorithm proposed by the 'LCU active pulse adjusting system of the hydropower station unit' (application number: 201610327273.6) of China patent can improve the timeliness and reliability of the power adjustment of the active pulse adjusting system of the hydropower station unit in an opening adjustment mode. The document [1] "one-time frequency modulation and AGC cooperative control transformation and experimental analysis of hydroelectric generating sets, water and electricity and pumped storage, lu Zhouxin, tu Yong, phyllanthus, 2020, 123 p.02, describes a control strategy of a speed regulator opening control mode and a power closed-loop control mode. The method adopts an intermediate relay to carry out expansion transmission of opening increasing and decreasing pulse control commands, thereby increasing intermediate links and fault points, and possibly causing uncontrolled opening control of the hydroelectric generating set due to faults of excitation coil damage failure, output node adhesion and the like of the intermediate relay. Disclosure of Invention In order to solve the technical problems, the invention provides the control method for the given aperture analog quantity mode of the monitoring system of the water turbine generator set, which optimizes the control method based on the traditional aperture pulse quantity mode control system of the monitoring system of the water turbine, and can improve the adjustment speed of the aperture of the guide vane and the active power, improve the stability and the reliability of equipment, reduce intermediate links and fault points, reduce the fault rate of the equipment, and ensure the safe, stable and high-quality operation of the unit and the power grid. The technical scheme adopted by the invention is as follows: a control method for a given mode of opening analog quantity of a hydroelectric generating set monitoring system, The monitoring system controller increases the opening degree increasing and decreasing pulse recognition program, and adopts the following control logic: ① If the controller of the monitoring system detects that the opening increasing pulse instruction output by the intermediate control process of the controller is 1, the given value of the opening analog quantity=the given value of the opening analog quantity+the fixed step length, otherwise, the given value of the opening analog quantity is kept unchanged; ② If the controller of the monitoring system detects that the opening increasing pulse instruction output by the intermediate control process of the controller is 1, the given value of the opening analog quantity=the given value of the opening analog quantity-the fixed step length, otherwise, the given value of the opening analog quantity is kept unchanged. The opening increasing pulse instruction output by the middle control process of the controller is in the prior art, namely, a monitoring system in t