CN108039738B - Hydroelectric generating set load control method - Google Patents
Hydroelectric generating set load control method Download PDFInfo
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- CN108039738B CN108039738B CN201810038179.8A CN201810038179A CN108039738B CN 108039738 B CN108039738 B CN 108039738B CN 201810038179 A CN201810038179 A CN 201810038179A CN 108039738 B CN108039738 B CN 108039738B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Control Of Eletrric Generators (AREA)
- Control Of Water Turbines (AREA)
Abstract
The application discloses a hydroelectric generating set load control method, which comprises the steps of obtaining an AGC (automatic gain control) instruction of a generating set, a primary frequency modulation amount of the generating set and a load of the generating set; performing selective switching processing on a unit AGC instruction or a local unit instruction set value IA, superposing the processed value with a primary frequency modulation amount, and taking the superposed value as a set value SP of a unit power regulator; processing the load of the unit through a FILTER, and taking the processed value as a measured value PV of a power regulator of the unit; and the unit power regulator calculates the input set value SP and the measured value PV to obtain a PID control output value. The hydroelectric generating set load control method adopts a segmented PID parameter control method, compensates for the influence of the characteristics of the hydroelectric generating set on the existing guide vane nonlinearity and water head variation, realizes the quick load response control of the hydroelectric generating set, has the advantages of simplicity and reliability in realization, and improves the control stability while ensuring the quick load control of the hydroelectric generating set.
Description
Technical Field
The application relates to the technical field of hydraulic power plant monitoring automation, in particular to a hydraulic power unit load control method.
Background
As the power generation proportion of new energy in the power grid is continuously increased, the fluctuation of the new energy forms a greater challenge to power scheduling. In order to compensate the fluctuation of grid-connected power generation of new energy such as wind power, photovoltaic and the like, the current common means comprises the improvement of the load variation capacity of a hydroelectric generating set, namely the rapid peak regulation and frequency modulation are carried out through the hydroelectric generating set, so that the accepting capacity of a power system to the new energy is improved.
However, rapid load fluctuations in the hydro-power generating unit cause a decrease in load control stability of the hydro-power generating unit. For example, in a water head rise and guide vane in a sensitive load response area, rapid load control will bring about fluctuation and even oscillation of the power of the thermal power unit.
Disclosure of Invention
The application provides a hydroelectric generating set load control method, which aims to solve the problems of easiness in generation and power fluctuation of a hydroelectric generating set in the conventional hydroelectric generating set load control.
The hydroelectric generating set load control method comprises the following steps,
acquiring an AGC instruction of a unit, a primary frequency modulation quantity of the unit and a load of the unit;
the unit AGC instruction or a local unit instruction set value IA is subjected to selection switching processing, a processed value is superposed with the primary frequency modulation amount, and the superposed value is used as a set value SP of the unit power regulator and is input into the unit power regulator;
processing the unit load through a FILTER, and inputting a processed value serving as a measured value PV of a unit power regulator into the unit power regulator;
the unit power regulator performs proportional, integral and differential control operation on an input set value SP and a measured value PV to obtain a PID control output value, and the PID control output value is transmitted to a speed regulating system.
Preferably, the unit power regulator performs proportional, integral and derivative control operations on the input set value SP and the measured value PV to obtain a PID control output value, specifically including,
the PID segment control formula is as follows:
PID control output value
Wherein kp is the proportional gain;
ti-integration time;
td-differential time;
ta-actual differential inertia time;
delta e is the deviation between the set value SP and the measured value PV of the unit load;
p0-rated load of the unit;
k1-k6 — total gain of the segment PID.
Preferably, the compensation of the gain is performed on the unit head variations, wherein the function for the gain is:
KIN＝FH_P(H0)/FH_P(H)，
wherein, FH_P(H0) -load curve function of fully opening guide vanes under rated head of the unit,
FH_P(H) -load curve function of fully opening guide vanes under different rated water heads of the unit,
KIN-automatic gain compensation of the unit load control input.
Preferably, before delivering the PID control output value to the governor system, the method further comprises modifying the PID control output value, wherein the function for modifying is,
KOUT＝O·FV-P(P)，
wherein, FV-P(P) -a specific function curve of the per-unit value of the guide vane opening under the rated water head of the unit and the per-unit value of the load of the unit;
KOUT-nonlinear correction values of the unit control outputs.
The hydroelectric generating set load control method adopts a segmented PID parameter control method, compensates for the influence of the characteristics of the hydroelectric generating set on the existing guide vane nonlinearity and water head variation, realizes the quick load response control of the hydroelectric generating set, has the advantages of simplicity and reliability in realization, and improves the control stability while ensuring the quick load control of the hydroelectric generating set.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a load control diagram of a hydroelectric generating set according to the present application.
Detailed Description
Fig. 1 is a hydroelectric generating set load control map according to the present application, and as shown in fig. 1, a hydroelectric generating set load control method includes,
acquiring an AGC instruction of a unit, a primary frequency modulation quantity of the unit and a load of the unit;
the unit AGC instruction or a local unit instruction set value IA is subjected to selection switching processing, a processed value is superposed with the primary frequency modulation amount, and the superposed value is used as a set value SP of the unit power regulator and is input into the unit power regulator;
processing the unit load through a FILTER, and inputting a processed value serving as a measured value PV of a unit power regulator into the unit power regulator;
the unit power regulator performs proportional, integral and differential control operation on an input set value SP and a measured value PV to obtain a PID control output value, and the PID control output value is transmitted to a speed regulating system.
In the present application, the power regulator of the power generating unit performs proportional, integral and differential control operations on an input set value SP and a measured value PV to obtain a PID control output value, specifically including,
the PID segment control formula is as follows:
PID control output value
Wherein kp is the proportional gain;
ti-integration time;
td-differential time;
ta-actual differential inertia time;
delta e is the deviation between the set value SP and the measured value PV of the unit load;
p0-rated load of the unit;
k1-k 6-total gain of segmented PID, generally, k1 is not less than k2 is not less than k3 is not less than k4 is not less than k5 is not less than k 6.
The method further comprises the step of compensating gain for the unit water head change. In this embodiment, a water head function modified by a gain of a PID inlet deviation is adopted in combination with the hydro-electric machine set to supplement and control the nonlinear influence generated by the water head change, wherein the water head function for the gain is:
KIN＝FH_P(H0)/FH_P(H)，
wherein, FH_P(H0) -load curve function of fully opening guide vanes under rated head of the unit,
FH_P(H) -load curve function of fully opening guide vanes under different rated water heads of the unit,
KIN-automatic gain compensation of the unit load control input.
In the application, a PID outlet is adopted in combination with a hydroelectric generating set, and the guide vane opening per unit value ratio function is corrected to compensate the large influence of the guide vane nonlinearity on the control. The concrete practical process comprises that before the PID control output value is transmitted to the speed regulating system, the method also comprises the step of correcting the PID control output value, the function used for correcting is,
KOUT＝O·FV-P(P)，
wherein, FV-P(P) -a specific function curve of the per-unit value of the guide vane opening under the rated water head of the unit and the per-unit value of the load of the unit;
KOUT-nonlinear correction values of the unit control outputs.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (3)
1. A load control method of a hydroelectric generating set is characterized by comprising the following steps,
acquiring an AGC instruction of a unit, a primary frequency modulation quantity of the unit and a load of the unit;
the unit AGC instruction or a local unit instruction set value IA is subjected to selection switching processing, a processed value is superposed with the primary frequency modulation amount, and the superposed value is used as a set value SP of a unit power regulator and is input into the unit power regulator;
processing the unit load through a FILTER, and inputting a processed value serving as a measured value PV of a unit power regulator into the unit power regulator;
the unit power regulator performs proportional, integral and differential control operation on an input set value SP and a measured value PV to obtain a PID control output value, and transmits the PID control output value to a speed regulating system,
the PID segment control formula is as follows:
wherein kp is the proportional gain;
ti-integration time;
td-differential time;
ta-actual differential inertia time;
delta e is the deviation between the set value SP and the measured value PV of the unit load;
p0-rated load of the unit;
k1-k6 — total gain of the segment PID.
2. The method of claim 1, further comprising compensating for a gain of the unit head variation, wherein the function for the gain is:
KIN＝FH_P(H0)/FH_P(H)，
wherein, FH_P(H0) -load curve function of fully opening guide vanes under rated head of the unit,
FH_P(H) -load curve function of fully opening guide vanes under different rated water heads of the unit,
KIN-automatic gain compensation of the unit load control input.
3. The method of claim 2, wherein prior to delivering the PID control output value to the governor system, the method further comprises modifying the PID control output value, wherein the function for modifying is,
KOUT＝O·FV-P(P)，
wherein, FV-P(P) -a specific function curve of the per-unit value of the guide vane opening under the rated water head of the unit and the per-unit value of the load of the unit;
KOUT-nonlinear correction values of the unit control outputs.
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| CN110161839B (en) * | 2019-05-16 | 2022-08-16 | 南京理工大学 | Multi-mode servo control method for turntable position of reflection type laser foreign matter removing device |
| CN112128602B (en) * | 2020-09-25 | 2021-09-14 | 江苏方天电力技术有限公司 | Lubricating oil temperature control method for large phase modifier capable of inhibiting intermittent internal disturbance |
Citations (2)
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| JP2013257279A (en) * | 2012-06-14 | 2013-12-26 | Saginomiya Seisakusho Inc | Vibration controller of fatigue testing machine |
| CN105785859A (en) * | 2016-03-03 | 2016-07-20 | 国网山东省电力公司电力科学研究院 | Optimization control system and method ensuring primary frequency modulation motion under AGC mode of thermal power generating unit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013257279A (en) * | 2012-06-14 | 2013-12-26 | Saginomiya Seisakusho Inc | Vibration controller of fatigue testing machine |
| CN105785859A (en) * | 2016-03-03 | 2016-07-20 | 国网山东省电力公司电力科学研究院 | Optimization control system and method ensuring primary frequency modulation motion under AGC mode of thermal power generating unit |
Non-Patent Citations (1)
| Title |
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| 水轮机调速器改进型控制结构结合增量式PID算法的功率调节及一次调频的实现;刘国富等;《大电机技术》;20161231(第4期);全文 * |
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