CN102751738B - Control method for preventing oscillation during power regulation of thermal power unit - Google Patents

Control method for preventing oscillation during power regulation of thermal power unit Download PDF

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Publication number
CN102751738B
CN102751738B CN201210212880.XA CN201210212880A CN102751738B CN 102751738 B CN102751738 B CN 102751738B CN 201210212880 A CN201210212880 A CN 201210212880A CN 102751738 B CN102751738 B CN 102751738B
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power
unit
assembling unit
control
setting
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CN102751738A (en
Inventor
刘友宽
卢勇
苏适
孙鹏
李萍
自云江
杜景琦
李长更
唐立军
罗恩博
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Abstract

The invention relates to a control method for preventing oscillation during power regulation of a thermal power unit. The control method comprises the following steps of: adding a self-adaptation parameter control link having great influence on the power of the thermal power unit in a power control circuit of the thermal power unit, thus achieving regulation quality of not influencing power when main operation parameters of the thermal power unit greatly change; adding a filter link and enhancing the damping of a closed-loop regulation circuit of the thermal power unit to avoid a resonance zone between the closed-loop regulation circuit and a power grid, thus enabling the control on the power of the thermal power unit to be more stable; performing linear correction on DEH (Digital Electro-Hydraulic Control System) control on a steam turbine governing valve to improve the linearization level of the steam turbine governing valve, thus promoting the power adjustment on the thermal power unit to be more stable; and sending alarms and outputting signals for releasing the closed-loop control of the thermal power unit if the power of the thermal power unit oscillates during the closed-loop control, thus rapidly eliminating the oscillation after the oscillation occurs. The control method provided by the invention can greatly reduce the low frequency oscillation of a power system, which is caused by the power oscillation of the thermal power unit. The control method provided by the invention has the obvious advantages of safety and stability.

Description

A kind of control method preventing fired power generating unit power regulation oscillation
Technical field
The invention belongs to Power Plant Thermal automation field, a kind of for current fired power generating unit ubiquity power control oscillation risk, by the application of this control method, the low-frequency oscillation of electric power system that fired power generating unit power control oscillation causes can be reduced greatly, improve the safe and stable operation level of unit and electrical network.
Background technology
The power low-frequency oscillation of recent year fired power generating unit happens occasionally, and brings great threat to the stable operation of electrical network, and the stable operation of unit is directly connected to the safe and stable operation level of electrical network.The power oscillation of unit can cause the vibration of electrical network, the safe and stable operation of serious threat electrical network.Though at present if any electrical network implemented the monitoring of unit low-frequency oscillation and the protecting control of off-the-line, the research that power oscillation prevention and Oscillation Solution for unit source remove also is lacked.
Excitation system likely weakens the damping torque of unit, damping torque is even caused to be negative, therefore negative damping mechanism is widely used in Low Frequency Oscillation Analysis and suppressing method research, by being furnished with the input of power system stabilizer, PSS (PSS) in excitation side, good inhibition is served to the vibration that the low resistance of electrical network causes, but also life is not being stopped paying out for the power low-frequency oscillation that control object and the control system of generating set complexity causes.
Set about furtheing investigate from fired power generating unit controlled device and control program, analyze from resonance, the characteristic such as non-linear, and research can be improved and solves the power of the assembling unit and to vibrate the method for the electricity grid oscillating caused.Larger by the non-linear effects of the principal parameters such as unit main steam pressure, temperature for power of the assembling unit controlled device, propose the parameter adaptive control method of power of the assembling unit PID, reach unit does not affect power control regulation quality when running principal parameter and changing greatly; Being subject to the impact of unit and electrical network resonance frequency band for power of the assembling unit PID closed loop, by increasing the damping filtering of controlled volume power measurement in power of the assembling unit close loop control circuit, avoiding the power of the assembling unit vibration that resonance causes; When vibration occurs the power of the assembling unit, by the power oscillation determination methods proposed, unit closed-loop control can be removed in time, effectively stop the power control oscillation of unit.
Summary of the invention
The object of the invention is:, power of the assembling unit controlled device complicated based on thermal power unit operation operating mode affects larger by operating condition, the vibration that the easy generation power of the assembling unit controls, propose and controlled the control adaptive approach of plant characteristic based on the power of the assembling unit, greatly reduce the vibration of power control circuit.And the determination methods that a kind of power of the assembling unit is vibrated is provided, power closed-loop control can be removed in time when unit generation power oscillation, to calm down power of the assembling unit vibration.
The present invention seeks to realize like this:
(1) by increasing the parameter adaptive control link larger on power of the assembling unit impact such as unit main steam pressure, main steam temperature in fired power generating unit power control circuit, unit does not affect power control regulation quality when running principal parameter and changing greatly is reached;
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=P T×f[h(P T，T S)] （1）
P t-unit main steam pressure;
T s-unit main steam temperature;
F [h (P t, T s)]-unit main steam enthalpy formed function;
The power of the assembling unit controls to adopt single loop PID regulative mode, and the power of the assembling unit adaptive factor R of calculating is used for P, I, D variable parameter control, or becomes the modes 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 the proportionality coefficient of parallel connection type PID adjuster, the time of integration, derivative time;
The controling parameters of k1 ~ k3-adjust;
The adaptive factor that R-power of the assembling unit PID regulates;
For the control system without PID variable element, adopt the deviation input outside PID be multiplied by R0/R realize power control self adaptation, R0 is the adaptive factor calculated under unit rated condition;
(2) by increasing filtering link in the power of the assembling unit signal measurement link of power of the assembling unit adjustment, increasing the damping in unit closed-loop adjustment loop, avoiding the resonant belt with electric network active and FREQUENCY CONTROL, the power of the assembling unit is controlled more stable;
The measurement links controlled in the power of the assembling unit adds filtering:
L PV=Filter(L) （6）
L-power of the assembling unit;
L pV-filtered the power of the assembling unit;
(3) by the power oscillation determination methods of a kind of generating set of proposition, if there is power oscillation when unit commitment closed-loop control, can send in the controls reports to the police and export removes power of the assembling unit closed loop command signal, energy oscillation-damped fast after the vibration of guarantee unit generation power closed-loop control;
Adopt the difference of maximum, the minimum value periodically detecting the power of the assembling unit in setting-up time, and in this setting-up time, the power of the assembling unit controls the difference of maximum, the minimum value of set point:
D Li=L iMAX-L iMIN（7）
D LSi=L iSMAX-L iSMIN（8）
D lithe difference of maximum, the minimum value of the power of the assembling unit in-setting-up time section i;
L iMAXthe maximum of the power of the assembling unit in-setting-up time section i;
L iMINthe minimum value of the power of the assembling unit in-setting-up time section i;
D lSithe difference of maximum, the minimum value of power of the assembling unit set point in-setting-up time section i;
L iSMAXthe maximum of power of the assembling unit set point in-setting-up time section i;
L iSMINthe minimum value of power of the assembling unit set point in-setting-up time section i;
Power of the assembling unit maximum deviation D in double above setting-up time li, power of the assembling unit set point maximum deviation D lSiboth difference D dithe alarming value all exceeding setting is reported to the police, and exceedes the protection act value of setting, output protection actuating signal, excises corresponding power of the assembling unit control loop:
D Di=D Li-D LSi（9）。
Remarkable advantage of the present invention is, by the enforcement of this control method, can reduce the low-frequency oscillation of electric power system that fired power generating unit power oscillation causes greatly, improve the security and stability level of unit and electrical network.Numerous based on fired power generating unit production procedure, operating condition is complicated, the power of unit controls frequently to there occurs vibration again.The power oscillation of unit causes the one of the main reasons of electricity grid oscillating at present, electricity grid oscillating is a kind of complicated question on power of electric power system, low-frequency oscillation is once occur, very large threat will be caused to power supply equipment, and likely bring out Cascading Failure, cause the catastrophic effect such as large-area power-cuts, system break-down.
Accompanying drawing explanation
Fig. 1 is the control block diagram preventing fired power generating unit power regulation oscillation of the present invention.
Embodiment
Prevent the control method of fired power generating unit power regulation oscillation, the platform of enforcement is the master control system of coal unit, and comprise CCS and DEH system, execution mode comprises the following steps:
One, for the controlling functions configuration that master control system is carried out:
(1) by increasing the parameter adaptive control link larger on power of the assembling unit impact such as unit main steam pressure, main steam temperature in fired power generating unit power control circuit, unit does not affect power control regulation quality when running principal parameter and changing greatly is reached;
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=P T×f[h(P T，T S)] （1）
P t-unit main steam pressure;
T s-unit main steam temperature;
F [h (P t, T s)]-unit main steam enthalpy formed function;
The power of the assembling unit controls to adopt single loop PID regulative mode, and the power of the assembling unit adaptive factor of calculating is used for P, I, D variable parameter control, or becomes the modes 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 the proportionality coefficient of parallel connection type PID adjuster, the time of integration, derivative time;
The controling parameters of k1 ~ k3-adjust;
The adaptive factor that R-power of the assembling unit PID regulates;
For the control system without PID variable element, adopt the deviation input outside PID to be multiplied by the adaptively correcting that R0/R realizes unit operation operating mode, R0 is the adaptive factor calculated under unit rated condition.
(2) by increasing filtering link in the power of the assembling unit signal measurement link of power of the assembling unit adjustment, increasing the damping in unit closed-loop adjustment loop, avoiding the resonant belt with electric network active and FREQUENCY CONTROL, the power of the assembling unit is controlled more stable;
The measurement links controlled in the power of the assembling unit adds filtering:
L PV=Filter(L) （6）
L-power of the assembling unit;
L pV-filtered the power of the assembling unit.
(3) by the power oscillation determination methods of a kind of generating set of proposition, if there is power oscillation when unit commitment closed-loop control, can send in the controls reports to the police and export removes power of the assembling unit closed loop command signal, energy oscillation-damped fast after the vibration of guarantee unit generation power closed-loop control;
Adopt the difference of maximum, the minimum value periodically detecting the power of the assembling unit in setting-up time, and in this setting-up time, the power of the assembling unit controls the difference of maximum, the minimum value of set point:
D Li=L iMAX-L iMIN（7）
D LSi=L iSMAX-L iSMIN（8）
D lithe difference of maximum, the minimum value of the power of the assembling unit in-setting-up time section i;
L iMAXthe maximum of the power of the assembling unit in-setting-up time section i;
L iMINthe minimum value of the power of the assembling unit in-setting-up time section i;
D lSithe difference of maximum, the minimum value of power of the assembling unit set point in-setting-up time section i;
L iSMAXthe maximum of power of the assembling unit set point in-setting-up time section i;
L iSMINthe minimum value of power of the assembling unit set point in-setting-up time section i;
Power of the assembling unit maximum deviation D in double above setting-up time li, power of the assembling unit set point maximum deviation D lSiboth difference D dithe alarming value all exceeding setting is reported to the police, and exceedes the protection act value of setting, output protection actuating signal, excises corresponding power of the assembling unit control loop:
D Di=D Li-D LSi（9）。
Two, carry out the debugging of controlling functions when unit operation and come into operation;
Three, the upset test of the operating mode of the various easy generation power oscillation of unit is carried out;
Four, the test run after carrying out control program enforcement with optimize and revise, and formally to put into operation.

Claims (1)

1. prevent a control method for fired power generating unit power regulation oscillation, it is characterized in that, the method comprises the following steps:
(1) by increasing unit main steam pressure, main steam temperature in fired power generating unit power control circuit, parameter adaptive control larger on power of the assembling unit impact in main steam pressure and main steam temperature, reach unit operationally state Parameters variation larger time do not affect the regulation quality that power controls;
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＝P T×f[h(P T,T S)] (1)
P t-unit main steam pressure;
T s-unit main steam temperature;
F [h (P t, T s)]-unit main steam enthalpy h (P t, T s) function that formed;
The power of the assembling unit controls to adopt single loop PID regulative mode, and the power of the assembling unit adaptive factor of calculating is used for P, I, D variable parameter control, or becomes PID input deviation gain mode, 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 the proportionality coefficient of parallel connection type PID adjuster, the time of integration, derivative time;
The controling parameters of k1 ~ k3-adjust;
The adaptive factor that R-power of the assembling unit PID regulates;
For the control system without PID variable element, adopt the deviation input outside PID to be multiplied by the adaptively correcting that R0/R realizes unit operating mode, R0 is the adaptive factor calculated under unit rated condition;
(2) by increasing filtering link in the power of the assembling unit signal measurement link of power of the assembling unit adjustment, increasing the damping in unit closed-loop adjustment loop, avoiding the resonant belt with electric network active and FREQUENCY CONTROL, the power of the assembling unit is controlled more stable;
The measurement links controlled in the power of the assembling unit adds filtering:
L PV＝Filter(L) (6)
L-power of the assembling unit;
L pV-filtered the power of the assembling unit;
(3) by the power oscillation determination methods of a kind of generating set of proposition, if there is power oscillation when unit commitment closed-loop control, can send in the controls reports to the police and export removes power of the assembling unit closed loop command signal, energy oscillation-damped fast after the vibration of guarantee unit generation power closed-loop control;
Adopt the difference of maximum, the minimum value periodically detecting the power of the assembling unit in setting-up time, and in this setting-up time, the power of the assembling unit controls the difference of maximum, the minimum value of set point:
D Li＝L iMAX-L iMIN(7)
D LSi＝L iSMAX-L iSMIN(8)
D lithe difference of maximum, the minimum value of the power of the assembling unit in-setting-up time section i;
L iMAXthe maximum of the power of the assembling unit in-setting-up time section i;
L iMINthe minimum value of the power of the assembling unit in-setting-up time section i;
D lSithe difference of maximum, the minimum value of power of the assembling unit set point in-setting-up time section i;
L iSMAXthe maximum of power of the assembling unit set point in-setting-up time section i;
L iSMINthe minimum value of power of the assembling unit set point in-setting-up time section i;
Power of the assembling unit maximum deviation D in double above setting-up time li, power of the assembling unit set point maximum deviation D lSiboth difference D dithe alarming value all exceeding setting is reported to the police, and exceedes the protection act value of setting, output protection actuating signal, excises corresponding power of the assembling unit control loop:
D Di＝D Li-D LSi(9)。
CN201210212880.XA 2012-06-26 2012-06-26 Control method for preventing oscillation during power regulation of thermal power unit Active CN102751738B (en)

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CN103490436B (en) * 2013-10-11 2017-07-28 云南电力试验研究院（集团）有限公司电力研究院 It is a kind of to prevent the control method of Hydropower Unit power regulation oscillation
CN104808509A (en) * 2015-02-12 2015-07-29 贵州电力试验研究院 Steam turbine model modification method taking main steam pressure influences into consideration
CN105116720B (en) * 2015-09-23 2017-10-03 云南电力试验研究院(集团)有限公司 The voltage-controlled valve control mode primary frequency modulation main vapour pressure adaptive optimization method of fired power generating unit
CN109301844B (en) * 2018-11-13 2020-09-01 南方电网科学研究院有限责任公司 Hydroelectric generating set speed regulator PID parameter optimization method and device based on power grid system
CN109286196A (en) * 2018-11-26 2019-01-29 贵州金元茶园发电有限责任公司 Prevent fired power generating unit from the system and method for oscillation of power diffusion occur
CN112148056B (en) * 2020-09-22 2022-05-10 江苏方天电力技术有限公司 Power adjusting method, device and system for thermal power generating unit
CN113467331B (en) * 2021-07-28 2024-02-09 华电莱州发电有限公司 Method for analyzing influence of controller parameters on automatic power generation control regulation performance
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