CN114094637A - Active power adjusting method and device for speed regulator of hydroelectric generating set - Google Patents
Active power adjusting method and device for speed regulator of hydroelectric generating set Download PDFInfo
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- CN114094637A CN114094637A CN202111285411.6A CN202111285411A CN114094637A CN 114094637 A CN114094637 A CN 114094637A CN 202111285411 A CN202111285411 A CN 202111285411A CN 114094637 A CN114094637 A CN 114094637A
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
Abstract
The invention discloses a method and a device for adjusting the active power of a hydro-power generating unit speed regulator, wherein in the active power control link of a microcomputer speed regulator, an integral gain coefficient is automatically switched according to the deviation of input PID; in different adjusting processes, the input and the removal of a power dead zone are carried out; a new filtering function is added in an active feedback link of the unit, and the influence of sampling jump on precision and stability control is reduced, so that the quick, accurate and stable control of active power is finally achieved. According to the invention, a method of 'large deviation small integral, small deviation large integral' and '0 dead zone in the adjusting process and adjusting and finishing adding the dead zone' is provided in the direction according to the analysis of the precision and the speed. The sampling peak is effectively weakened, and the specific method of precision and response speed is not damaged, so that the stability of power regulation is improved. The control structure is simple and easy to program; the filtering method is simple in calculation, effective and feasible; the parameter change direction is clear and easy to select.
Description
Technical Field
The invention relates to an active power adjusting method and device for a hydroelectric generating set speed regulator, and belongs to the technical field of set power adjustment.
Background
At present, the active power regulation of hydroelectric generating set (hereinafter referred to as active power, power and set active power) is one of the core tasks of power station control system, and the automatic equipment for completing the active power regulation is the speed regulator. The reliability, stability, advancement and control precision of the speed regulator equipment are important for the power generation operation of the hydroelectric generating set. Generally speaking, the active power control of domestic hydropower station units has two basic control modes, one is that a monitoring system performs closed-loop regulation on the active power of the units, namely a regulation module is realized in the monitoring system, and at the moment, a speed regulator is used as an execution mechanism of the next stage of the monitoring system to perform guide vane opening regulation so as to achieve the response of power; the other is that the speed regulator carries out closed-loop regulation of the active power of the unit, namely the power regulation module is realized in a speed regulation system, and the closed-loop regulation is carried out according to an active power given value issued by a monitoring system and active feedback acquired by the monitoring system.
At present, in China, most of hydropower station speed regulators adopt digital speed regulators, classical PID (proportion integration differentiation) regulation is adopted for power and frequency control, and a dead zone sum e is adoptedpThe difference adjustment rate is not changed essentially, but with the technological progress and the requirement of precise production, the quality requirement of people on electric power is increased increasingly, so that a power generation system is required to carry out precise control on active power. The conventional control method has large error and low control speed, and cannot meet the quality requirements of power regulation and primary frequency modulation regulation.
The active control of the domestic speed regulator on the machine set is mostly conventional PID control, and some improvement strategies are to adopt the known relationships among water head, opening and power, perform plug-in calculation, quickly find the opening of a guide vane corresponding to the current water head according to the target value of the active power and adjust the opening, then perform power PID adjustment under small deviation, and combine large adjustment similar to the opening and small adjustment of the power to achieve the purpose of quickly adjusting the power. The method can solve the problems of quick adjustment of power and universality of PID parameters, but cannot achieve accurate adjustment of power and quick convergence adjustment under small deviation.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a method and a device for adjusting the active power of a speed regulator of a hydroelectric generating set.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, a method for adjusting active power of a speed regulator of a hydroelectric generating set comprises the following steps:
when the speed regulator detects that the set power given value set by the external monitoring system changes, the power dead zone theta is changed to 0, the set power given value and the set power feedback input quantity are differed to obtain delta P, and the frequency difference delta f is obtained according to the delta P2。
Will frequency difference Δ f2And unit frequency variation delta f1Making a difference to obtain delta f, if the frequency difference delta f2When the integral gain coefficient is larger than the threshold value, selecting an integral gain coefficient KI1, sending the delta f and the KI1 into the PID for calculation, and outputting the output quantity of active power; if the frequency difference is Δ f2When the integral gain coefficient is smaller than the threshold value, the integral gain coefficient KI2 is selected, the delta f and the KI1 are sent to the PID for calculation, current or voltage driving signals of the electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure and flow signals to drive the main distributing valve, the main distributing valve drives the water guide mechanism to perform switching action according to a power source provided by external pressure oil, the water flow flowing into the water turbine is controlled, the water energy of the water turbine and the active power of the generator are controlled, and an active power output value is output.
After power regulation for a certain time, changing the power dead zone theta into a set value of the power dead zone, subtracting a set power given value and a set power feedback input quantity to obtain delta P, and solving a frequency difference delta f according to the delta P2Frequency difference Δ f2And unit frequency variation delta f1The difference is made to obtain delta f, the delta f is kept, KI2 is sent into PID to be calculated, current or voltage driving signals of an electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure, flow signals drive a main distributing valve, the main distributing valve drives a water guide mechanism to perform switching action according to power sources provided by external pressure oil, water flow flowing into a water turbine is controlled, therefore, water energy of the water turbine and active power of a generator are controlled, until the variable quantity of the output quantity of the active power is within the range of a set value of a power dead zone, the output quantity of the active power is stabilized, and an adjuster reaches a stable state.
Preferably, KI1 ranges from 0.01 to 0.3; KI2 is 1.2-1.5 times larger than KI.
Preferably, the threshold is set at 0.1 Hz.
As a preferred scheme, the method for obtaining the unit power feedback input quantity comprises the following steps:
the speed regulator converts the active power output quantity of the unit into a power analog quantity signal through a power transmitter and sends the power analog quantity signal to the controller.
The controller of the speed regulator collects the power analog quantity signal and converts the power analog quantity into digital quantity
And the controller of the speed regulator filters the digital quantity to obtain the power feedback input quantity of the unit.
Preferably, the filtering method includes the following steps:
wherein P is the unit power feedback input quantity, P(t-1)Is a digital quantity at the last moment, P(t)Is a digital quantity of the current time.
Preferably, the PID calculation method includes the steps of:
and respectively inputting the delta f into the proportional gain control module, the differential control module and the integral control module.
The output quantity of the differential control module is input into the differential gain module.
The output quantity of the integral control module is respectively connected with the first integral gain module and the second integral gain module through a selector switch, when the frequency difference delta f2 is greater than the threshold value, the output quantity of the integral control module is communicated with the first integral gain module through the selector switch, and the integral gain coefficient of the first integral gain module is KI 1; when the frequency difference delta f2 is smaller than the threshold value, the output quantity of the integral control module is communicated with the second integral gain module through a selector switch, and the integral gain coefficient of the second integral gain module is KI 2.
And summing the output quantity of the proportional gain control module and the output quantity of the differential gain module with the output quantity of the first integral gain module or the second integral gain module to obtain a PID calculation output signal.
Preferably, the certain time is set to 3 minutes.
In a second aspect, an active power adjusting device for a speed regulator of a hydroelectric generating set comprises the following modules:
the frequency difference calculation module is used for changing the power dead zone theta to 0 when the speed regulator detects that the set power given value set by the external monitoring system changes, subtracting the set power given value from the set power feedback input quantity to obtain delta P, and solving the frequency difference delta f according to the delta P2。
A primary adjustment module: for dividing the frequency difference Δ f2And unit frequency variation delta f1Making a difference to obtain delta f, if the frequency difference delta f2When the integral gain coefficient is larger than the threshold value, selecting an integral gain coefficient KI1, sending the delta f and the KI1 into the PID for calculation, and outputting the output quantity of active power; if the frequency difference is Δ f2When the integral gain coefficient is smaller than the threshold value, the integral gain coefficient KI2 is selected, the delta f and the KI1 are sent to the PID for calculation, current or voltage driving signals of the electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure and flow signals to drive the main distributing valve, the main distributing valve drives the water guide mechanism to perform switching action according to a power source provided by external pressure oil, the water flow flowing into the water turbine is controlled, the water energy of the water turbine and the active power of the generator are controlled, and an active power output value is output.
A stable adjustment module: after power regulation for a certain time, changing the power dead zone theta into a set value of the power dead zone, subtracting a set power given value and a set power feedback input quantity to obtain delta P, and solving the frequency difference delta f according to the delta P2Frequency difference Δ f2And unit frequency variation delta f1The difference is made to obtain delta f, the delta f is kept, KI2 is sent into PID to be calculated, current or voltage driving signals of an electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure, flow signals drive a main distributing valve, the main distributing valve drives a water guide mechanism to perform switching action according to power sources provided by external pressure oil, water flow flowing into a water turbine is controlled, therefore, water energy of the water turbine and active power of a generator are controlled, until the variable quantity of the output quantity of the active power is within the range of a set value of a power dead zone, the output quantity of the active power is stabilized, and an adjuster reaches a stable state.
Has the advantages that: the invention provides a hydroelectric generating set speed regulator active power adjusting method and device, in the active power control link of the microcomputer speed regulator, the integral gain coefficient is automatically switched according to the deviation of the input PID; in different adjusting processes, the input and the removal of a power dead zone are carried out; a new filtering function is added in an active feedback link of the unit, and the influence of sampling jump on precision and stability control is reduced, so that the quick, accurate and stable control of active power is finally achieved. Its advantages are as follows:
1. the invention provides a power regulation strategy, and the functions of variable dead zone and variable integral are added. According to the analysis of the precision and the speed, a method of ' large deviation small integral, small deviation large integral ' and ' 0 dead zone in the adjusting process ' is provided in the direction, and the dead zone is added after the adjustment is completed '.
2. Aiming at the unit active analog quantity sampling, the invention also provides a new filtering method based on the evolution characteristic, which effectively weakens the sampling peak and does not damage the precision and the response speed, thereby improving the stability of power regulation.
3. The invention has simple control structure and easy programming; the filtering method is simple in calculation, effective and feasible; the parameter change direction is clear and easy to select.
Drawings
FIG. 1 is a schematic block diagram of the power regulation of the method of the present invention.
Fig. 2 is a schematic diagram of the switching of the power dead zone during regulation.
FIG. 3 is a timing diagram of the switching function.
Fig. 4 is a schematic diagram of unit active power sampling.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1, an active power adjusting method for a hydro-power generating unit speed regulator includes the following steps:
step 1: the speed regulator converts the active power output quantity of the unit into a power analog quantity signal through a power transmitter and sends the power analog quantity signal to the controller, and the power analog quantity signal is set to be a 4-20mA current signal; the current signal corresponds to the unit active power output quantity.
Step 2: a controller PCC or PLC of the speed regulator collects power analog quantity signals through an analog quantity module and converts the power analog quantity into digital quantity. The corresponding relation is 4mA to 6553, and 20mA to 32767.
And step 3: the controller of the speed regulator filters the digital quantity to obtain the power feedback input quantity of the unit, and the power feedback input quantity is used for eliminating power sampling interference and other random peak signals which are useless for control.
And 4, step 4: the external monitoring system sets a set power set value for the speed regulator in an analog quantity or communication mode.
And 5: when the speed regulator detects that the set power given value set by the external monitoring system changes, the power dead zone theta is immediately changed to 0, the set power given value and the set power feedback input quantity are subjected to difference to obtain delta P, and the delta P is obtained according to a difference adjustment formula ep＝Δf2/ΔP，epFor the difference rate, the frequency difference Δ f is determined2Frequency difference Δ f2And unit frequency variation delta f1And (3) performing difference to obtain delta f, sending the delta f to a PID (proportion integration differentiation) for calculation and output, outputting a current or voltage driving signal of an electro-hydraulic converter, converting the current or voltage driving signal into a hydraulic pressure and a flow signal by the electro-hydraulic converter to drive a main pressure distribution valve (a hydraulic amplification unit), and driving a water guide mechanism to perform switching action according to a power source provided by external pressure oil by the main pressure distribution valve to control the water flow flowing into the water turbine, so that the water energy of the water turbine and the active power of a generator are controlled, and an active power output value is output.
The PID calculation process is as follows:
and respectively inputting the delta f into the proportional gain control module, the differential control module and the integral control module.
The output quantity of the differential control module is input into the differential gain module.
The output quantity of the integral control module is respectively connected with the first integral gain module and the second integral gain module through a selector switch, when the frequency difference delta f2 is greater than the threshold value, the output quantity of the integral control module is communicated with the first integral gain module through the selector switch, and the integral gain coefficient of the first integral gain module is KI 1; when the frequency difference delta f2 is smaller than the threshold value, the output quantity of the integral control module is communicated with the second integral gain module through a selector switch, and the integral gain coefficient of the second integral gain module is KI 2.
And summing the output quantity of the proportional gain control module and the output quantity of the differential gain module with the output quantity of the first integral gain module or the second integral gain module to obtain a PID calculation output signal.
Step 6: when frequency difference Δ f2When the integral gain coefficient is larger than the threshold value (generally larger than 0.1Hz), the integral gain coefficient is selected from KI 1; when frequency difference Δ f2When the integral gain coefficient is larger than the threshold value (generally smaller than 0.1Hz), the integral gain coefficient is selected to be KI 2. According to experience, the values of the integral gain coefficients are different for different unit types and models, and generally speaking, the size range of KI1 is 0.01-0.3; KI2 is 1.2-1.5 times of KI, and the integral gain coefficient is obtained by engineering experience summary.
And 7: the timing is started from the change of the set power given value, namely the speed regulator receives a new regulating task, and the speed regulator automatically sets the power dead zone to be 0 at the moment, namely the power regulation is carried out under the condition of no dead zone, so that the power can be accurately regulated to the target value. If a dead zone exists in the adjusting process, the power can not be adjusted to the range of the dead zone all the time, and only the upper edge and the lower edge of the dead zone can be adjusted; that is, the dead zone occurring at this time can only increase the adjustment error, and it does not make any sense to set the dead zone. When the power deviation is small, generally less than 5% (according to the adjustment equation e)p＝Δf/ΔP，epAt 4%, Δ f may be calculated to be 0.1Hz), and in the convergence stage at the later stage of the adjustment, the adjustment is relatively slow, and at this time, the integral coefficient needs to be increased to increase the convergence rate. However, at large deviations, too large an integral gain factor cannot be used, which would otherwise lead to overshoot. The method of changing the integral, namely 'large deviation and small integral and small deviation and large integral', is adopted, and the stability and the rapidity of the adjusting process can be considered. After the power regulation process reaches three minutes (normally, the power regulation is enough to complete the power regulation of any magnitude within three minutes), the speed regulator changes the power dead zone theta to a power dead zone set value (normally about 1 percent),the power feedback is within the set power dead zone range, and the dead zone is increased to ensure the stability of the speed regulator system after the regulation is in place, which is the essential meaning of the dead zone set by the system.
And 8: after the speed regulator is adjusted stably, the guide vane is kept unchanged, and theoretically, the power feedback is also kept unchanged. However, due to complex hydraulic factors of the hydropower station and the influence of rainfall and continuous drainage on a water head, the power of the unit fluctuates and slips to a certain extent. This is because the difference between the set power setpoint and the set power feedback input will exceed the set power dead band even if there is no new power setpoint. And (5) detecting the power dead zone set value of which the difference value is greater than the power dead zone set value by the speed regulator in real time, changing the power dead zone theta to 0 again, returning to the step (5), (the integral change depends on the deviation, and if the integral change is not greater than the set deviation threshold, switching is not carried out) until the power feedback input quantity of the unit is within the set power dead zone range.
The above is a subsection explanation, namely that the speed regulator adjusts the power and is a timely, continuous, repeated and cyclic dynamic adjusting process.
Example (b):
(1) the variable parameter requirement for accurate and small deviation speed control of power is met.
In the dead zone link, a 0 dead zone link is added and connected in parallel with the dead zone link. In the integral link, an integral gain coefficient KI2 (larger than KI 1) is added and connected with the original integral gain coefficient KI1 in parallel. The switching selection of the two is carried out automatically according to certain control requirements.
Under the condition of small deviation, the integral gain coefficient is weak, but the integral output of the integral gain coefficient is increased within unit time due to the addition of the integral gain coefficient, and is finally transmitted to a hydraulic control system to form quick adjustment; in addition, the adjusting process has no influence of dead zones, the given value and the feedback value are compared and calculated in real time, and finally the feedback value and the given value are completely consistent.
The method of 'large deviation and small integral, small deviation and large integral' and '0 dead zone in the adjusting process and adding dead zone after adjusting' is adopted, so that the aim of accurately adjusting the power can be effectively fulfilled.
The switching of the power dead zone, the regulation process, can be represented by figure 2. The upper graph in fig. 2 is a power down step adjustment and the lower graph is a power up step adjustment.
(2) And switching on and off logic of the switch.
The drop-back logic can be described literally as: when the control program detects given power change (rising edge or falling edge), the program automatically cuts off the power dead zone and the integral gain coefficient is called KI1The change-over switch 1 acts, and the power dead zone is changed over to 0 to be adjusted; the program is scanned circularly, when the frequency difference Δ f2 is detected to be smaller than a certain threshold (the program can be modified), and the change-over switch 2 is actuated to automatically switch over to KI2And (6) carrying out adjustment. After the time exceeds 3 minutes from the beginning of the adjustment and timing, the change-over switches 1 and 2 automatically switch the 0 dead zone to the theta dead zone, and simultaneously the integral gain coefficient is switched to KI2And keeping the current state.
As shown in fig. 3, due to the existence of complex hydraulic stability factors in the hydropower station, when the power feedback deviates from the given power (the given power is unchanged) and exceeds the power dead zone due to the fluctuation of the water head or the water pressure, the change-over switches 1 and 2 are put into operation again to complete the adjustment for three minutes, and the change-over switches are withdrawn after the control target is reached (the theoretical and actual adjustment within the adjustment for 3 minutes can reach the target control requirement).
(3) Filtering module for power feedback
As shown in FIG. 4, the power signal is generally input to the analog quantity acquisition module of the speed regulator as a 4-20mA analog quantity signal, and is converted into a corresponding code value through analog-to-digital conversion. Typically 4mA corresponds to 6553 and 20mA corresponds to 32767. This gives the linear equation for current and code values of 1638 × X, where X is the current and Y is the code value.
Suppose that the analog quantity of the power signal at point a is 12mA, corresponding to a code value of 19659; the analog quantity of the power signal at the point B (the sampling point of the next period) is 18mA, and the analog quantity can be calculated according to a linear equation, and the corresponding code value is 29489; if the mean filtering is adopted, the processing method is (A + B)/2 ═ 2474. The invention adopts a method of squaring a current sampling value and a last period sampling value and then multiplyingThe method comprises the following steps:
by adopting evolution, the instantaneous distortion peak can be effectively weakened according to evolution data curve characteristics (nonlinear bending), and if the burrs are dense, the method can be adopted
I.e. the pull up period. Taking the above values as examples, the processed sample value for point A, B should be:
this value is closer to the actual value than the result of the averaging calculation.
The filtering function can be put into or cut off in the active large-fluctuation regulation process of the unit, and has no substantial influence on power regulation. The investments are valid when the power regulation enters the convergence phase, for example within 3% deviation.
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.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A method for adjusting active power of a speed regulator of a hydroelectric generating set is characterized by comprising the following steps: the method comprises the following steps:
when the speed regulator detects that the set power given value set by the external monitoring system changes, the power dead zone theta is changed to 0, the set power given value and the set power feedback input quantity are differed to obtain delta P, and the frequency difference delta f is obtained according to the delta P2；
Will frequency difference Δ f2And unit frequency variation delta f1Making a difference to obtain delta f, if the frequency difference delta f2When the integral gain coefficient is larger than the threshold value, selecting an integral gain coefficient KI1, sending the delta f and the KI1 into the PID for calculation, and outputting the output quantity of active power; if the frequency difference is Δ f2When the integral gain coefficient is smaller than the threshold value, the integral gain coefficient KI2 is selected,sending the delta f and the KI1 into a PID (proportion integration differentiation) for calculation, outputting a current or voltage driving signal of an electro-hydraulic converter, converting the current or voltage driving signal into a hydraulic pressure or flow signal by the electro-hydraulic converter to drive a main pressure distribution valve, driving a water distributor to perform switching action according to a power source provided by external pressure oil by the main pressure distribution valve, and controlling the flow of water flowing into a water turbine, so that the water energy of the water turbine and the active power of a generator are controlled, and an active power output value is output;
after power regulation for a certain time, changing the power dead zone theta into a set value of the power dead zone, subtracting a set power given value and a set power feedback input quantity to obtain delta P, and solving a frequency difference delta f according to the delta P2Frequency difference Δ f2And unit frequency variation delta f1The difference is made to obtain delta f, the delta f is kept, KI2 is sent into PID to be calculated, current or voltage driving signals of an electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure, flow signals drive a main distributing valve, the main distributing valve drives a water guide mechanism to perform switching action according to power sources provided by external pressure oil, water flow flowing into a water turbine is controlled, therefore, water energy of the water turbine and active power of a generator are controlled, until the variable quantity of the output quantity of the active power is within the range of a set value of a power dead zone, the output quantity of the active power is stabilized, and an adjuster reaches a stable state.
2. The active power regulation method of the hydro-power generating unit speed regulator according to claim 1, characterized in that: KI1 ranged from 0.01-0.3; KI2 is 1.2-1.5 times larger than KI.
3. The active power regulation method of the hydro-power generating unit speed regulator according to claim 2, characterized in that: the threshold was set at 0.1 Hz.
4. The active power regulation method of the hydro-power generating unit speed regulator according to claim 1, characterized in that: the method for acquiring the unit power feedback input quantity comprises the following steps:
the speed regulator converts the active power output quantity of the unit into a power analog quantity signal through a power transmitter and sends the power analog quantity signal to the controller;
the controller of the speed regulator collects the power analog quantity signal and converts the power analog quantity into digital quantity
And the controller of the speed regulator filters the digital quantity to obtain the power feedback input quantity of the unit.
5. The active power regulation method of the hydro-power generating unit speed regulator according to claim 4, characterized in that: the filtering method comprises the following steps:
wherein P is the unit power feedback input quantity, P(t-1)Is a digital quantity at the last moment, P(t)Is a digital quantity of the current time.
6. The active power regulation method of the hydro-power generating unit speed regulator according to claim 1, characterized in that: the PID calculation method comprises the following steps:
respectively inputting the delta f into a proportional gain control module, a differential control module and an integral control module;
the output quantity of the differential control module is input into a differential gain module;
the output quantity of the integral control module is respectively connected with the first integral gain module and the second integral gain module through a selector switch, when the frequency difference delta f2 is greater than the threshold value, the output quantity of the integral control module is communicated with the first integral gain module through the selector switch, and the integral gain coefficient of the first integral gain module is KI 1; when the frequency difference delta f2 is smaller than the threshold value, the output quantity of the integral control module is communicated with the second integral gain module through a selector switch, and the integral gain coefficient of the second integral gain module is KI 2;
and summing the output quantity of the proportional gain control module and the output quantity of the differential gain module with the output quantity of the first integral gain module or the second integral gain module to obtain a PID calculation output signal.
7. The active power regulation method of the hydro-power generating unit speed regulator according to claim 1, characterized in that: the certain time is set to 3 minutes.
8. The utility model provides a hydroelectric generating set speed regulator active power adjusting device which characterized in that: the system comprises the following modules:
the frequency difference calculation module is used for changing the power dead zone theta to 0 when the speed regulator detects that the set power given value set by the external monitoring system changes, subtracting the set power given value from the set power feedback input quantity to obtain delta P, and solving the frequency difference delta f according to the delta P2；
A primary adjustment module: for dividing the frequency difference Δ f2And unit frequency variation delta f1Making a difference to obtain delta f, if the frequency difference delta f2When the integral gain coefficient is larger than the threshold value, selecting an integral gain coefficient KI1, sending the delta f and the KI1 into the PID for calculation, and outputting the output quantity of active power; if the frequency difference is Δ f2When the integral gain coefficient is smaller than the threshold value, the integral gain coefficient KI2 is selected, the delta f and the KI1 are sent to the PID for calculation, current or voltage driving signals of an electro-hydraulic converter are output, the electro-hydraulic converter converts the current or voltage driving signals into hydraulic pressure and flow signals to drive a main pressure distribution valve, the main pressure distribution valve drives a water guide mechanism to perform switching action according to a power source provided by external pressure oil, and the water flow flowing into the water turbine is controlled, so that the water energy of the water turbine and the active power of a generator are controlled, and an active power output value is output;
a stable adjustment module: after power regulation for a certain time, changing the power dead zone theta into a set value of the power dead zone, subtracting a set power given value and a set power feedback input quantity to obtain delta P, and solving the frequency difference delta f according to the delta P2Frequency difference Δ f2And unit frequency variation delta f1The difference is made to obtain delta f, the delta f and KI2 are kept to be sent to PID for calculation, a current or voltage driving signal of an electro-hydraulic converter is output, the electro-hydraulic converter converts the current or voltage driving signal into a hydraulic pressure signal and a flow signal to drive a main distributing valve, and the main distributing valve drives a water guide mechanism to perform opening and closing actions according to a power source provided by external pressure oilAnd controlling the water flow flowing into the water turbine so as to control the water energy of the water turbine and the active power of the generator until the variable quantity of the output quantity of the active power is within the range of the set value of the power dead zone, outputting the stable output quantity of the active power, and enabling the regulator to reach a stable state.
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