CN111953247A - Method and device for fine adjustment and control of power of hydroelectric generating set - Google Patents
Method and device for fine adjustment and control of power of hydroelectric generating set Download PDFInfo
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- CN111953247A CN111953247A CN202010503871.0A CN202010503871A CN111953247A CN 111953247 A CN111953247 A CN 111953247A CN 202010503871 A CN202010503871 A CN 202010503871A CN 111953247 A CN111953247 A CN 111953247A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
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Abstract
The invention discloses a method and a device for finely adjusting and controlling the power of a hydroelectric generating set, wherein the hydroelectric generating set adopts an internal and external double closed-loop control mode in the power adjustment and control process, the internal and external double closed-loop control adopts the traditional PID control, the outer loop is the power fine adjustment and control, the outer loop adjusts and calculates a fine adjustment pulse width value, and sends a primary pulse increasing or pulse decreasing according to the power deviation of the power actual value and the power set value and the fine adjustment pulse width value to finely adjust the power of the hydroelectric generating set, so that the power actual value is closer to the power set value. The invention can not only make the real power value more accurate, but also avoid overshoot or power oscillation, thereby solving the problems of adjusting precision and adjusting speed in the process of adjusting the power of the existing hydroelectric generating set, improving the reliability of the running of the hydroelectric generating set, and reducing the cost and pressure of the production, operation and maintenance of the hydropower station.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a method and a device for finely adjusting and controlling power of a hydroelectric generating set.
Background
The important function of the hydroelectric power plant is to convert the water potential energy into electric energy and transmit the electric energy through a power network, so that the active power and the reactive power of the unit need to be dynamically adjusted and controlled in real time according to the power dispatching requirement in order to guarantee the quality of the transmitted electric energy.
The regulation and control of active power and reactive power of hydraulic power plant are commonly completed by computer monitoring system, speed regulator or exciting device and water-turbine generator set, at present, the most mature control mode of power regulation of hydraulic power plant is PID regulation, and the computer monitoring system and speed regulator or exciting device form a power closed loop system. The PID closed loop is generally realized in two modes of a monitoring system closed loop and a speed regulator or an excitation device closed loop.
The closed loop of the monitoring system means that the regulation and control of active power or reactive power are mainly completed by a computer monitoring system, and a speed regulator or an excitation device is only used as an actuating mechanism. The computer monitoring system calculates the increasing/decreasing pulse width of active power or reactive power through a PID algorithm according to a power set value, and adjusts a guide vane of a speed regulator or a regulator of an excitation device to complete power regulation of a unit; the closed loop of the speed regulator or the exciting device means that the regulation and control of active power or reactive power are mainly completed by the speed regulator or the exciting device, a computer monitoring system is only used as the input of a power set value, and a PID algorithm is realized in a controller of the speed regulator or the exciting device. The PID closed-loop regulation of the monitoring system is a main regulation and control mode of the hydropower station, and the closed loop of the speed regulator or the excitation device is gradually applied to large hydropower stations or pumped storage power stations.
The current hydroelectric generating set power regulation does not perform more precise processing on the power regulation precision, generally, the real power value of the generating set enters a power regulation dead zone range in the regulation process, namely, the regulation control process is finished, the real power value of the generating set is actually deviated from a set value, and the real power value may be higher than the set value or lower than the set value. Under the condition that the number of the power station units is large, the deviation of the total power actual value of the whole plant from the total power set value is obvious, the power dispatching department sets an assessment threshold value for the deviation of the total power of the whole plant, and the economic assessment is carried out under the condition that the deviation exceeds the threshold value. In order to avoid the assessment caused by the total power deviation of the whole plant, the computer monitoring system is finely adjusted in an automatic generation control module (AGC), and the total active power of the whole plant further approaches to a set value by adjusting the power of a single unit or a plurality of units. The adjustment of the total power deviation in the automatic generation control AGC is a palliative method and is not handled from the origin of the deviation. This approach reduces the efficiency of the execution of the automatic power generation control and also affects the rate of plant wide power regulation.
Disclosure of Invention
The invention provides a method and a device for finely adjusting and controlling the power of a hydroelectric generating set, aiming at solving the problems of adjusting precision and adjusting speed in the power adjusting process of the conventional hydroelectric generating set, improving the stability and reliability of the operation of the hydroelectric generating set, and reducing the cost and pressure of the production, operation and maintenance of a power station.
In order to achieve the purpose, the invention adopts the technical scheme that:
an embodiment of the present invention provides a method for finely adjusting and controlling power of a hydroelectric generating set, including:
judging whether the inner ring PID control is finished or not according to the set power change value, and if so, switching the power regulation control mode into a pulse regulation mode;
sending a fine tuning pulse width for one time in a pulse adjusting mode to carry out outer loop control;
after the outer loop control is finished, the power regulation control mode is switched to the original regulation mode;
after a certain time delay, the fine tuning pulse width is optimized and calculated to be used as the fine tuning pulse width of the next outer loop control.
Further, the method also comprises the following steps:
equally dividing the rated power of the unit into n equal parts to obtain n power change values: p (1), P (2), …, P (i), …, P (n),
wherein, PNFor rated power of the unit, PdeadbandThe dead band is adjusted for power.
Further, the determining whether the inner loop PID control is completed includes:
judging whether the following conditions are met: I.DELTA.P1|<Pdeadband；
△P1＝Pset-Preal；
If so, finishing the inner ring PID control;
wherein Pset is the power set value in the inner loop PID control, Preal is the power actual value in the inner loop PID control, PdeadbandThe dead band is adjusted for power.
Further, the sending of the fine-tuning pulse width once in the pulse adjusting mode for outer-loop control includes:
if Δ P2>0.0, sending a pulse reduction according to the fine adjustment pulse width value;
if Δ P2<0.0, sending a pulse increasing according to the fine adjustment pulse width value;
wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is completed when the power change value is p (i).
Further, in the above-mentioned case,
setting the minimum pulse width value regulated by the PID of the computer monitoring system as the initial fine tuning pulse width;
or determining an initial fine-tune pulse width based on field power regulation experiments.
Further, the performing optimization calculation on the fine tuning pulse width includes:
if | Pset (i) -preal (i) | < Mdeadband, keeping the corresponding fine tuning pulse width of the power variation value P (i) unchanged;
if | Pset (i) -preal (i) | ≧ Mdeadband, the fine-tuning pulse width is updated as follows:
where mp (i) represents the last calculated fine tuning pulse width value, mp (i)' represents the updated fine tuning pulse width value, and Mdeadband is the fine tuning dead zone.
Further, the fine tuning dead zone is calculated as follows:
calculating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished;
accumulating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished, and calculating the average value;
the calculated average value is set as the fine tuning dead zone for the next adjustment.
Further, the initial value of the fine tuning dead zone is:
Mdeadband0＝k*Pdeadband；
wherein M isdeadband0K is a coefficient satisfying 0.2 for an initial value of the trimming dead zone<k<1.0，PdeadbandThe dead band is adjusted for power.
In another aspect, an embodiment of the present invention further provides a power fine adjustment control device for a hydroelectric generating set, including:
the switching module is used for judging whether the inner ring PID control is finished or not for the set power change value, and if the inner ring PID control is finished, the power regulation control mode is switched to the pulse regulation mode;
the fine tuning module is used for sending a fine tuning pulse width for one time in a pulse tuning mode to carry out outer loop control;
the recovery module is used for switching the power regulation control mode to the original regulation mode after the outer loop control is finished;
and the number of the first and second groups,
and the optimization module is used for performing optimization calculation on the fine tuning pulse width after a certain time delay to serve as the fine tuning pulse width of the next outer ring control.
Furthermore, the fine-tuning module is specifically configured to,
if Δ P2>0.0, sending a pulse reduction according to the fine adjustment pulse width value;
if Δ P2<0.0, sending a pulse increasing according to the fine adjustment pulse width value;
wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is completed when the power change value is p (i).
Further, the optimization module is specifically configured to,
if | Pset (i) -preal (i) | < Mdeadband, keeping the corresponding fine tuning pulse width of the power variation value P (i) unchanged;
if | Pset (i) -preal (i) | ≧ Mdeadband, the fine-tuning pulse width is updated as follows:
where mp (i) represents the last calculated fine tuning pulse width value, mp (i)' represents the updated fine tuning pulse width value, and Mdeadband is the fine tuning dead zone.
Further, the optimization module is further configured to calculate a fine tuning dead zone:
calculating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished;
accumulating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished, and calculating the average value;
the calculated average value is set as the fine tuning dead zone for the next adjustment.
The invention has the advantages that the power outer loop regulation of the appointed pulse width is carried out immediately after the PID power inner loop regulation of the unit is finished each time, the precision of the unit power regulation is improved, and the economic assessment loss caused by the power regulation deviation is reduced; meanwhile, the fine adjustment pulse can be adjusted in a self-adaptive mode, the efficiency of power adjustment is improved, and the quality of the whole power adjustment of the monitoring system is improved.
Drawings
Fig. 1 is a schematic diagram of a hydroelectric generating set power control system.
Fig. 2 is a schematic diagram of a fine power adjustment process of the hydroelectric generating set.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, the hydroelectric generating set power control system is composed of an input module, a control module and an output module, wherein the input module comprises an alternate collection meter, a power transmitter and a power collection module; the output module comprises a pulse adjusting module, a communication adjusting module and a module output mode module; the control module comprises an inner ring PID control module, an outer ring fine tuning control module and a dynamic optimization matrix module; the hydroelectric generating set power regulation and control objects are a water turbine speed regulator and a generator excitation system.
The alternating current collection meter can collect real-time electrical data such as voltage, current and power in real time through a communication mode.
The power transmitter can acquire 4-20mA electric signals in real time in a hard wiring mode and convert the electric signals into actual electric data.
The power acquisition module can acquire 4-20mA electric signals in real time in a hard wiring mode and convert the electric signals into actual electric data.
And the inner ring PID control module is used for outputting an active power set value instruction and a reactive power set value instruction to the output module.
And the outer ring fine adjustment control module is used for calculating fine adjustment pulse width and sending the fine adjustment pulse width to the output module. The calculated fine tuning pulse width is realized through a PID function module in the local control unit PLC and is output through DO.
And the dynamic optimization matrix module is used for calculating an optimal input and output combination mode and outputting the optimal input and output combination mode to the output module.
The pulse adjusting module is used for sending pulse increasing and decreasing instructions to the speed regulator or the excitation system according to the calculated fine adjustment pulse width, the speed regulator performs guide vane opening change according to the pulse width to realize active power adjustment, and the excitation system increases and decreases magnetism of the regulator according to the pulse width to realize reactive power adjustment.
The communication regulation module is used for sending the power set value instruction to the speed regulator or the excitation system, and then the regulation of the unit power is completed by the PID regulation function of the speed regulator or the excitation system.
The module mode module is used for controlling a regulating instruction to be issued to the speed regulator or the excitation system in a 4-20mA signal, and then the speed regulator or the excitation system completes the regulation of the unit power by the PID regulating function of the speed regulator or the excitation system. The mold-out mode module adopts an AO mold-out module of a monitoring system local control unit PLC.
The invention completes the fine adjustment of the unit power by the inner and outer double closed-loop control, the inner loop refers to the traditional PID control, and the outer loop control is the fine adjustment control of the power. The outer ring adjustment is further power adjustment after the PID inner ring power adjustment is finished, and the outer ring adjustment is used for finely adjusting the unit power by a computer monitoring system in a pulse adjustment mode, so that the real power value is closer to the power set value.
The fine power regulation control method for the hydroelectric generating set comprises the following steps:
step 1, an initial fine tuning dead zone Mdeadband0 is determined.
The initial fine tuning dead band Mdeadband0 may be determined according to a power adjustment dead band Pdeadband of a hydro-power generating unit speed regulator or an excitation system, where the power adjustment dead band Pdeadband of the unit is related to an adjustment error of the speed regulator or the excitation device, for example: the rated active power of the unit is 300MW, the adjusting error of the speed regulator is 1%, and the adjusting dead zone of the active power of the unit is 3 MW.
The initial fine tuning dead zone Mdeadband0Set as a power regulation dead zone PdeadbandK times of (c):
Mdeadband0＝k*Pdeadband(0.2<k<1.0)
the initial fine adjustment dead zone is reset after the hydroelectric generating set is overhauled every time, the initial fine adjustment dead zone is only used during the first power adjustment of the hydroelectric generating set, and the fine adjustment dead zone after optimization is used.
Step 2, fine tuning the dead zone MdeadbandDynamic optimization of (2).
And taking the absolute value of the deviation between the power actual value and the power set value after each power fine adjustment is finished, calculating the average value of the absolute values of the accumulated deviations, and setting the calculated average deviation as a fine adjustment dead zone of the next adjustment.
And step 3, determining an initial fine tuning pulse width Mpulse 0.
The initial fine tune pulse width Mpulse0 may be determined from a computer monitoring system PID adjusted minimum pulse width value or from field power adjustment experiments.
And 4, self-adaptive adjustment of the fine tuning pulse width.
According to the actual requirements on site, the rated power P of the unit can be adjustedNDividing the power variation values into n equal parts P (1), P (2), …, P (i), …, P (n), wherein each power variation value P (i) corresponds to a fine tuning pulse width mp (i), and mp (i) is set as an initial pulse width Mpulse0 during initial calculation;
the value of n is:
for the power change value P (i), calculating the deviation of the power actual value after the fine adjustment of each time and the power set value, and if the power actual value after the adjustment enters the fine adjustment dead zone M of the set valuedeadbandKeeping the corresponding fine tuning pulse width mp (i) of the power variation value p (i) unchanged; and if the real power value does not enter the fine tuning dead zone of the set power value after the current adjustment, increasing the fine tuning pulse width mp (i).
The maximum value of the fine tuning pulse width mp (i) does not exceed the maximum pulse width value of PID adjustment, and the minimum value is the initial fine tuning pulse width Mpulse 0.
The calculation formula of the fine tuning pulse width mp (i) for fine power adjustment is as follows:
wherein mp (i) represents the last calculated fine adjustment pulse width value, mp (i)' represents the fine adjustment pulse width value updated by fine adjustment, pset (i) represents the power set value when the power change value is p (i), and preal (i) represents the power real value after the fine adjustment is finished when the power change value is p (i).
Referring to fig. 2, the fine tuning implementation process is:
(1) the outer ring fine tuning control judges whether the inner ring PID control is finished, namely:
|△P1|<Pdeadband
wherein: delta P1＝Pset-Preal
If the formula is not satisfied, the inner ring PID control is not completed; wherein Pset is a power set value in inner loop PID control, and Preal is a power real value in inner loop PID control;
(2) if the PID control is not finished, waiting;
(3) if the PID control is finished, sending a mode switching instruction to the speed regulator or the excitation system, and switching the power regulation control mode into a pulse regulation mode;
(4) according to power deviation Δ P2Sending an up-pulse or down-pulse mp (i), i.e. Δ P2>0.0, sending a subtractive pulse,. DELTA.P2<0.0, send up pulses. Wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is finished when the power change value is p (i);
(5) after the pulse adjustment is finished, the power adjustment control mode is switched to the original adjustment mode;
(6) after a certain delay, calculating Δ P2For fine tuning dead zone MdeadbandAnd fine tuning pulse widths mp (i) are calculated for optimization.
Further, the fine adjustment of the outer loop power means that after the inner loop PID adjustment is completed, an increase/decrease pulse is sent once again according to the fine adjustment pulse width mp (i), and a single pulse adjustment is used to ensure that the real power value further approaches the set value and avoid overshoot or power oscillation.
The embodiment of the invention also provides a power fine adjustment control device for the hydroelectric generating set, which comprises:
the switching module is used for judging whether the inner ring PID control is finished or not for the set power change value, and if the inner ring PID control is finished, the power regulation control mode is switched to the pulse regulation mode;
the fine tuning module is used for sending a fine tuning pulse width for one time in a pulse tuning mode to carry out outer loop control;
the recovery module is used for switching the power regulation control mode to the original regulation mode after the outer loop control is finished;
and the number of the first and second groups,
and the optimization module is used for performing optimization calculation on the fine tuning pulse width after a certain time delay to serve as the fine tuning pulse width of the next outer ring control.
Furthermore, the fine-tuning module is specifically configured to,
if Δ P2>0.0, sending a pulse reduction according to the fine adjustment pulse width value;
if Δ P2<0.0, sending a pulse increasing according to the fine adjustment pulse width value;
wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is completed when the power change value is p (i).
Further, the optimization module is specifically configured to,
if | Pset (i) -preal (i) | < Mdeadband, keeping the corresponding fine tuning pulse width of the power variation value P (i) unchanged;
if | Pset (i) -preal (i) | ≧ Mdeadband, the fine-tuning pulse width is updated as follows:
where mp (i) represents the last calculated fine tuning pulse width value, mp (i)' represents the updated fine tuning pulse width value, and Mdeadband is the fine tuning dead zone.
Further, the optimization module is further configured to calculate a fine tuning dead zone:
calculating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished;
accumulating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished, and calculating the average value;
the calculated average value is set as the fine tuning dead zone for the next adjustment.
It is to be noted that the apparatus embodiment corresponds to the method embodiment, and the implementation manners of the method embodiment are all applicable to the apparatus embodiment and can achieve the same or similar technical effects, so that the details are not described herein.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (12)
1. A fine power regulation control method for a hydroelectric generating set is characterized by comprising the following steps:
judging whether the inner ring PID control is finished or not according to the set power change value, and if so, switching the power regulation control mode into a pulse regulation mode;
sending a fine tuning pulse width for one time in a pulse adjusting mode to carry out outer loop control;
after the outer loop control is finished, the power regulation control mode is switched to the original regulation mode;
after a certain time delay, the fine tuning pulse width is optimized and calculated to be used as the fine tuning pulse width of the next outer loop control.
2. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 1, further comprising:
equally dividing the rated power of the unit into n equal parts to obtain n power change values: p (1), P (2), …, P (i), …, P (n),
wherein, PNFor rated power of the unit, PdeadbandThe dead band is adjusted for power.
3. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 1, wherein the step of judging whether the inner loop PID control is completed comprises the steps of:
judging whether the following conditions are met: I.DELTA.P1|<Pdeadband；
△P1＝Pset-Preal；
If so, finishing the inner ring PID control;
wherein Pset is the power set value in the inner loop PID control, Preal is the power actual value in the inner loop PID control, PdeadbandThe dead band is adjusted for power.
4. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 1, wherein the sending of the fine-tuning pulse width once in the pulse adjustment mode for outer-loop control comprises:
if Δ P2>0.0, sending a pulse reduction according to the fine adjustment pulse width value;
if Δ P2<0.0, sending a pulse increasing according to the fine adjustment pulse width value;
wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is completed when the power change value is p (i).
5. The method for fine adjustment and control of the power of the hydroelectric generating set according to claim 4,
setting the minimum pulse width value regulated by the PID of the computer monitoring system as the initial fine tuning pulse width;
or determining an initial fine-tune pulse width based on field power regulation experiments.
6. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 4, wherein the optimally calculating the fine adjustment pulse width comprises:
if | Pset (i) -preal (i) | < Mdeadband, keeping the corresponding fine tuning pulse width of the power variation value P (i) unchanged;
if | Pset (i) -preal (i) | ≧ Mdeadband, the fine-tuning pulse width is updated as follows:
where mp (i) represents the last calculated fine tuning pulse width value, mp (i)' represents the updated fine tuning pulse width value, and Mdeadband is the fine tuning dead zone.
7. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 6, wherein the fine adjustment dead zone is calculated as follows:
calculating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished;
accumulating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished, and calculating the average value;
the calculated average value is set as the fine tuning dead zone for the next adjustment.
8. The method for finely adjusting and controlling the power of the hydroelectric generating set according to claim 6, wherein the initial value of the fine adjustment dead zone is as follows:
Mdeadband0＝k*Pdeadband；
wherein M isdeadband0K is a coefficient satisfying 0.2 for an initial value of the trimming dead zone<k<1.0，PdeadbandThe dead band is adjusted for power.
9. The utility model provides a hydroelectric generating set power fine tuning controlling means which characterized in that includes:
the switching module is used for judging whether the inner ring PID control is finished or not for the set power change value, and if the inner ring PID control is finished, the power regulation control mode is switched to the pulse regulation mode;
the fine tuning module is used for sending a fine tuning pulse width for one time in a pulse tuning mode to carry out outer loop control;
the recovery module is used for switching the power regulation control mode to the original regulation mode after the outer loop control is finished;
and the number of the first and second groups,
and the optimization module is used for performing optimization calculation on the fine tuning pulse width after a certain time delay to serve as the fine tuning pulse width of the next outer ring control.
10. The hydroelectric generating set power fine-tuning control device of claim 9, wherein the fine-tuning module is specifically configured to,
if Δ P2>0.0, sending a pulse reduction according to the fine adjustment pulse width value;
if Δ P2<0.0, sending a pulse increasing according to the fine adjustment pulse width value;
wherein, Δ P2Pset (i) -preal (i), pset (i) represents a power set value when the power change value in the outer loop control is p (i), and preal (i) represents a power actual value after the fine adjustment is completed when the power change value is p (i).
11. The hydroelectric generating set power fine-tuning control device of claim 10, wherein the optimization module is specifically configured to,
if | Pset (i) -preal (i) | < Mdeadband, keeping the corresponding fine tuning pulse width of the power variation value P (i) unchanged;
if | Pset (i) -preal (i) | ≧ Mdeadband, the fine-tuning pulse width is updated as follows:
where mp (i) represents the last calculated fine tuning pulse width value, mp (i)' represents the updated fine tuning pulse width value, and Mdeadband is the fine tuning dead zone.
12. The hydroelectric generating set power fine-tuning control apparatus of claim 11, wherein the optimization module is further configured to calculate a fine-tuning dead-zone:
calculating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished;
accumulating the absolute value of the deviation between the power actual sending value and the power set value after each power fine adjustment is finished, and calculating the average value;
the calculated average value is set as the fine tuning dead zone for the next adjustment.
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