CN112412691A - Primary frequency modulation method for speed regulator of variable-speed pumped storage unit - Google Patents
Primary frequency modulation method for speed regulator of variable-speed pumped storage unit Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
- F03B15/08—Regulating, i.e. acting automatically by speed, e.g. by measuring electric frequency or liquid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
- F03B15/16—Regulating, i.e. acting automatically by power output
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/10—Machines or engines of reaction type; Parts or details peculiar thereto characterised by having means for functioning alternatively as pumps or turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention relates to a primary frequency modulation method of a speed regulator of a variable-speed pumped storage unit, which is based on a given frequency FGAnd a feedback frequency FfObtaining an effective frequency difference delta f and a primary frequency modulation power adjustment quantity delta P of a primary frequency modulation action; the power regulating quantity delta P of the primary frequency modulation and the power given value P of the speed regulator are comparedG1The superposition obtains the power given P after superpositionG2(ii) a Obtaining the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, and obtaining the superposed power given P according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unitG2Corresponding optimum opening Gv1And optimizing the speed of rotation N1(ii) a Respectively converting the opening, the rotating speed and the power deviation into corresponding opening adjustment quantities and adjusting the opening in an opening mode, a rotating speed mode and a power mode; the invention realizes the functions of variable-speed primary frequency modulation under the working condition of the water turbine and primary frequency modulation under the working condition of the water pump by analyzing two different working conditions of power generation and water pumping of the pumped storage unit and the unique variable-speed control mode of the variable-speed unit, and fully plays the role of the variable-speed unit in supporting the frequency stability of the power grid.
Description
Technical Field
The invention relates to a primary frequency modulation method, in particular to a primary frequency modulation method for a speed regulator of a variable-speed pumped storage unit.
Background
Because electric power can not be stored in a large scale, electric energy generated by a power grid needs to be matched with an electric load, but the load of a power system often changes randomly, and a power supply point in grid-connected operation is disconnected with the power grid due to various accidents, so that the power generation and the power utilization of the power system are unbalanced, when the system output active power is smaller than the load demand active power, the system frequency is reduced, and otherwise, the system frequency is increased. The primary frequency modulation of the speed regulator is the basic function of the water turbine regulating system, and in the power generation operation process of the unit, when the frequency change of a power grid exceeds the frequency (rotating speed) dead zone of the regulating system, the water turbine regulating system automatically changes the opening degree of a guide vane according to the inherent capacity of the frequency static characteristic (difference adjustment characteristic) and the set difference adjustment rate/permanent state slip coefficient, so that the change of the output power of the unit is caused, and the regulating process of the power grid frequency is further influenced.
With the development of the energy storage unit technology, the problems of vibration, cavitation erosion, abrasion and operation efficiency are solved, the stability margin of a system is increased, the hydro-turbine unit needs to operate at variable speed, and the primary frequency modulation technology for the variable-speed motor unit still belongs to a blank technology.
Disclosure of Invention
The invention provides a primary frequency modulation method of a speed regulator of a variable-speed pumped storage unit, aiming at realizing the precise primary frequency modulation function of the variable-speed pumped storage unit and solving the blank phenomenon of the primary frequency modulation technology of the variable-speed pumped storage unit. The invention realizes the functions of variable-speed primary frequency modulation under the working condition of the water turbine and primary frequency modulation under the working condition of the water pump by analyzing two different working conditions of power generation and water pumping of the pumped storage unit and the unique variable-speed control mode of the variable-speed unit, and fully plays the role of the variable-speed unit in supporting the frequency stability of the power grid.
The technical scheme adopted by the invention is as follows: a primary frequency modulation method for a speed regulator of a variable-speed pumped storage unit comprises
Obtaining a given frequency FGAnd feedback frequency F of the gridfAccording to said given frequency FGAnd a feedback frequency FfObtaining an effective frequency difference delta f of a primary frequency modulation action;
obtaining a primary frequency modulation power adjustment quantity delta P according to the effective frequency difference delta f;
the power regulating quantity delta P of the primary frequency modulation and the power given value P of the speed regulator are comparedG1The superposition obtains the power given P after superpositionG2；
Obtaining the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, and obtaining the superposed power given P according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unitG2Corresponding optimum opening Gv1And optimizing the speed of rotation N1；
In the opening degree mode, according to the optimized opening degree Gv1Adjusting the opening degree;
in the rotation speed mode, according to the optimized rotation speed N1And optimizing the opening Gv1Adjusting the opening degree;
in power mode, P is given according to the superposed powerG2And (5) adjusting the opening degree.
Further, the given frequency FGIs 50 Hz.
Further, according to the given frequency FGAnd a feedback frequency FfTo obtain a given frequency FGAnd a feedback frequency FfThe effective frequency difference delta f of the primary frequency modulation action is obtained through the frequency dead zone.
Further, the effective frequency difference Δ f is multiplied by the inverse difference coefficient 1/epAnd obtaining the primary frequency modulation power adjustment quantity delta P.
Furthermore, under the power generation working condition, according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit and the current water head H of the unitGAnd the power after superposition is given by PG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
Furthermore, under the condition that the water pump pumps water, P is given according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, the current lift Hy of the water pump and the superposed powerG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
Further, in the opening mode, the governor will optimize the opening G of the guide vanev1And taking the collected guide vane opening as a feedback, comparing the difference between the guide vane opening given and the feedback, performing PI (proportion plus integral) regulation, and adjusting the guide vane opening.
Further, in the speed mode, the speed N will be optimized1The collected set rotating speed is used as feedback, the difference value of the set rotating speed value and the feedback value is compared, and PID (proportion + integral + differential) regulation is carried out;
the PID output quantity is converted into a speed regulator opening degree adjustment quantity delta Y1, a speed regulator opening degree adjustment quantity delta Y1 and an optimized opening degree Gv1Superposing the obtained target values to obtain the final guide vane opening degree, and giving the final guide vane opening degree and feeding back the guide vane opening degreevfComparing, and feeding back G according to the guide vane opening degreevfThe deviation of (a) is subjected to PI adjustment.
Further, in the power mode, the superimposed power is given by PG2And as the power setting of the speed regulator, the collected active power of the unit is used as feedback, the difference value between the power setting and the feedback is compared, PI regulation is carried out on the difference value between the power setting and the feedback to obtain an output signal, the output signal is converted into the deviation between the opening setting and the feedback of the speed regulator, and PI regulation is carried out on the deviation between the opening setting and the feedback of the speed regulator.
The beneficial effects produced by the invention comprise: the method comprises the steps of detecting the deviation of the system frequency and the rated frequency during grid-connected operation, converting corresponding active power variation according to the slip coefficient of the speed regulator, superposing the active power variation on the active power setting of the speed regulator, analyzing different operation conditions (a water turbine or water pump mode) and different modes (an opening mode, a rotating speed mode and a power mode) of the speed regulator, and respectively executing different primary frequency modulation strategies.
Drawings
FIG. 1 is a schematic diagram of primary frequency modulation under the power generation condition of a variable speed unit hydraulic turbine;
FIG. 2 is a schematic diagram of a power/head/opening/rotation speed operating characteristic curve under a power generation condition of the variable speed unit;
FIG. 3 is a schematic diagram of primary frequency modulation under the water pumping condition of a water pump of a variable speed unit water turbine;
fig. 4 is a schematic diagram of power/lift/opening/rotating speed operating characteristic curves under the water pumping condition of the water pump.
Detailed Description
The present invention is explained in further detail below with reference to the drawings and the specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
The invention discloses a primary frequency modulation method of a speed regulator of a variable-speed pumped storage unit, which comprises the following steps of
Obtaining a given frequency FGAnd feedback frequency F of the gridfAccording to said given frequency FGAnd a feedback frequency FfObtaining an effective frequency difference delta f of a primary frequency modulation action;
obtaining a primary frequency modulation power adjustment quantity delta P according to the effective frequency difference delta f;
the power regulating quantity delta P of the primary frequency modulation and the power given value P of the speed regulator are comparedG1The superposition obtains the power given P after superpositionG2；
Obtaining the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, and obtaining the superposed power given P according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unitG2Corresponding optimum opening Gv1And optimizing the speed of rotation N1；
In the opening degree mode, according to the optimized opening degree Gv1Adjusting the opening degree;
in the rotation speed mode, according to the optimized rotation speed N1And optimizing the opening Gv1Adjusting the opening degree;
in power mode, according to the stackThe added power is given by PG2And (5) adjusting the opening degree.
In some embodiments, the given frequency FGIs 50 Hz.
In some embodiments, according to said given frequency FGAnd a feedback frequency FfTo obtain a given frequency FGAnd a feedback frequency FfThe effective frequency difference delta f of the primary frequency modulation action is obtained through the frequency dead zone.
In some embodiments, the effective frequency difference Δ f is multiplied by the inverse of the adjustment coefficient 1/epAnd obtaining the primary frequency modulation power adjustment quantity delta P.
In some embodiments, under the power generation working condition, the current water head H of the unit is determined according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unitGAnd the power after superposition is given by PG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
In some embodiments, under the condition of pumping water by the water pump, the P is given according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, the current lift Hy of the water pump and the superposed powerG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
In some embodiments, in the opening mode, the governor will optimize the guide vane opening Gv1And taking the collected guide vane opening as a guide vane opening setting as a feedback, comparing the difference between the guide vane opening setting and the feedback, performing PI regulation, and adjusting the guide vane opening.
In some embodiments, in the speed mode, speed N will be optimized1The set value of the rotating speed of the speed regulator is used as the set value of the rotating speed of the speed regulator, the collected set rotating speed is used as feedback, the difference value of the set value of the rotating speed and the feedback value is compared, and PID regulation is carried out;
the PID output quantity is converted into a speed regulator opening degree adjustment quantity delta Y1, a speed regulator opening degree adjustment quantity delta Y1 and an optimized opening degree Gv1Superposing the obtained target values to obtain the final guide vane opening degree, and giving the final guide vane opening degree and feeding back the guide vane opening degreevfComparing, and feeding back G according to the guide vane opening degreevfThe deviation of (a) is subjected to PI adjustment.
In some embodiments, in power mode, the superimposed power is given by PG2And as the power setting of the speed regulator, the collected active power of the unit is used as feedback, the difference value between the power setting and the feedback is compared, PI regulation is carried out on the difference value between the power setting and the feedback to obtain an output signal, the output signal is converted into the deviation between the opening setting and the feedback of the speed regulator, and PI regulation is carried out on the deviation between the opening setting and the feedback of the speed regulator.
In some embodiments, the primary frequency modulation is performed as follows
The primary frequency modulation strategy under the working condition of the water turbine of the variable-speed unit is as follows:
the primary frequency modulation strategy under the power generation working condition of the variable speed unit water turbine is shown in the following figure 1. As can be seen from the figure, the primary frequency modulation strategy of the speed regulator under the power generation condition mainly comprises the following three steps:
1) calculating primary frequency modulation superposition power:
referring to fig. 1 above, the feedback frequency F of the grid is first detectedfWith a given frequency FGThe deviation (generally 50Hz) is processed by a frequency dead zone link (generally +/-0.05 Hz) which is manually set to obtain the effective frequency difference delta f of the primary frequency modulation action, and then multiplied by 1/epThe theoretical power value of the primary frequency modulation operation can be obtained by converting the theoretical power value into the corresponding power change, i.e., the primary frequency modulation power adjustment amount Δ P (where Δ f, Δ P have been converted into per unit values based on the rated value) according to the formula (1-1).
Wherein Δ f is the effective frequency difference, epIs the slip coefficient, PrAnd delta P is the rated power of the unit, and is the primary frequency modulation power adjustment quantity.
2) Optimizing guide vane opening and optimizing rotating speed interpolation calculation:
referring to fig. 2: the power/water head/opening degree/rotating speed operation characteristic curve diagram under the power generation working condition of the variable speed unit can beBasic data are obtained through a variable speed unit model runner hydraulic test to be drawn, and the running statistical data of the variable speed unit is corrected for years, so that the optimal running point of the water turbine under different water heads and different input powers of the unit is displayed, the point has higher running efficiency, and meanwhile, the rotating speed and opening data of the point can be obtained through the existing data interpolation. Adding the delta P calculated by the step 1 and the given power value P given to the speed regulator by the monitoring systemG1So that the power after superposition is given by PG2Then inputting the current unit head HG(can be measured by a water level differential pressure transmitter), the measured water level differential pressure is input into a power/water head/opening degree/rotating speed data table which is stored in a speed regulator controller and is shown in the figure 2, and the optimized guide vane opening degree and rotating speed of the speed change unit can be obtained through interpolation calculation and are recorded as an optimized opening degree Gv1And optimizing the speed of rotation N1。
3) Primary frequency modulation strategy of power generation operation speed regulator under different modes
Because the variable-speed pumped storage unit has the characteristic of rotating speed adjustability, the speed regulator has three modes of opening closed loop, rotating speed closed loop and power closed loop, and the primary frequency modulation strategy of each mode is different, the operating mode of the speed regulator needs to be selected, and a manual pre-selection mode is generally adopted. If the governor is set in the opening mode, the governor will optimize the opening G of step two as shown in FIG. 1v1Directly setting the opening degree of the guide vane as the collected opening degree G of the guide vanevfAnd as feedback, comparing the difference between the given opening degree and the feedback, performing PI regulation, and adjusting the opening degree of the guide vane to realize primary frequency modulation.
If the speed regulator is set in the rotating speed mode, the speed regulator optimizes the rotating speed N in the second step1The collected set rotating speed N is used as the set rotating speed value of the speed regulatorfAnd 5, as feedback, comparing the difference value between the given rotating speed and the feedback, performing PID (proportion integration differentiation) regulation, converting the PID output quantity into a speed regulator opening regulating quantity, superposing the speed regulator opening regulating quantity with the guide vane opening optimized in the step two to be used as the final guide vane given, comparing the final guide vane given with the guide vane feedback, and performing PI regulation on the deviation, thereby regulating the guide vane opening to realize primary frequency modulation.
If the speed regulator is set in power mode, the speed regulator will go over step two and directly give the power after the superposition calculated in step one to PG2As the power of the speed regulator is given, the collected unit active power PfAnd as feedback, comparing the difference value of the given power and the feedback, performing PI regulation, converting a regulation signal into a given opening amount of the speed regulator, comparing the given opening amount with the collected guide vane feedback, and performing PI regulation on the deviation, thereby regulating the opening amount of the guide vane to realize primary frequency modulation.
Primary frequency modulation strategy under working condition of water pump of variable-speed unit
The constant-speed pumped storage unit can not participate in primary frequency modulation under the working condition of the water pump, but the variable pumped storage unit can still realize primary frequency modulation under the working condition of the water pump because of adopting an alternating current excitation mode, and the detailed scheme is as shown in the following figure 3:
as can be seen from fig. 3, the primary frequency modulation strategy of the speed regulator under the water pumping condition of the water pump is similar to the power generation condition, and can still be divided into three steps:
1) calculating primary frequency modulation superposition power:
referring to fig. 3 above, the grid frequency F is detectedfWith a given frequency FGThe deviation (generally 50Hz) is processed by a frequency dead zone link (generally +/-0.05 Hz) which is manually set to obtain the effective frequency difference delta f of the primary frequency modulation action, and then multiplied by 1/epAnd obtaining the theoretical power value delta P of the primary frequency modulation action.
2) Optimizing guide vane opening and optimizing rotating speed interpolation calculation:
referring to fig. 4: the power/lift/opening/rotating speed operation characteristic curve diagram of the variable speed unit water pump under the working condition shows the optimal operation point of the water pump for pumping water under different lifts and different input powers, and the rotating speed and opening data of the point can be obtained through the interpolation of the existing opening and rotating speed data. Calculating delta P through the step 1, and adding a given power value P of the monitoring system to the speed regulatorG1So that the power after superposition is given by PG2Then inputting the current water pump lift Hy and inputting the stored power/lift of figure 4 in the speed regulator controllerThe opening degree/rotating speed data table can obtain the opening degree and the rotating speed of the guide vane after the working condition of the water pump of the variable speed unit is optimized through interpolation calculation, and the opening degree and the rotating speed are recorded as an optimized opening degree Gv1And optimizing the speed of rotation N1。
3) Primary frequency modulation strategy of water pump operation speed regulator under different modes
Similarly, under the working condition of the water pump, the speed regulator has three operation modes of opening, rotating speed and power closed loop. If the governor is set in the opening mode, the governor will optimize the opening G in step two, as shown in FIG. 4v1And directly taking the opening degree as the guide vane opening degree setting, comparing the opening degree setting with the feedback difference, and performing PI regulation to realize primary frequency modulation.
Optimizing the rotating speed N in the second step if the speed regulator is set in the rotating speed mode1And (3) as a given rotating speed value of the speed regulator, comparing a difference value between the given rotating speed and the fed rotating speed, performing PID regulation, converting a regulation signal into a variable quantity of the opening of the speed regulator, superposing the variable quantity of the opening of the guide vane optimized in the step two to be used as the final given guide vane, comparing the variable quantity with the feedback of the guide vane, performing PI regulation, and realizing primary frequency modulation.
If the speed regulator is set in power mode, the power after superposition calculated in step one is directly given by PG2And as the power setting of the speed regulator, the collected active power of the unit is used as feedback, the difference value between the power setting and the feedback is compared, PI regulation is carried out, the output signal is converted into the opening setting quantity of the speed regulator, the opening setting quantity is compared with the feedback of the guide vane, the deviation is obtained, and PI regulation is carried out, so that the opening of the guide vane is regulated to realize primary frequency modulation.
The invention has the following advantages:
(1) at present, the primary frequency modulation of a conventional hydroelectric generating set is realized by converting frequency deviation into guide vane opening or active power variation through a difference adjustment coefficient, and the method utilizes the advantage of adjustable rotating speed of a speed change unit and adds a method for converting the frequency deviation into the rotating speed variation through the difference adjustment coefficient to adjust in a primary frequency modulation opening adjustment and power adjustment mode of the conventional hydroelectric generating set.
(2) At present, the primary frequency modulation of a conventional pumped storage unit can only be carried out under the power generation working condition, and the primary frequency modulation cannot be carried out under the water pumping working condition of a water pump.
The invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments of the invention disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.
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 (9)
1. A primary frequency modulation method for a speed regulator of a variable-speed pumped storage unit is characterized by comprising the following steps: comprises that
Obtaining a given frequency FGAnd feedback frequency F of the gridfAccording to said given frequency FGAnd a feedback frequency FfObtaining an effective frequency difference delta f of a primary frequency modulation action;
obtaining a primary frequency modulation power adjustment quantity delta P according to the effective frequency difference delta f;
the power regulating quantity delta P of the primary frequency modulation and the power given value P of the speed regulator are comparedG1The superposition obtains the power given P after superpositionG2；
Obtaining the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, and obtaining the superposed power given P according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unitG2Corresponding optimum opening Gv1And optimizing the speed of rotation N1；
In the opening degree mode, according to the optimized opening degree Gv1Adjusting the opening degree;
in the rotational speed mode, according to optimizationRotational speed N1And optimizing the opening Gv1Adjusting the opening degree;
in power mode, P is given according to the superposed powerG2And (5) adjusting the opening degree.
2. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: said given frequency FGIs 50 Hz.
3. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: according to said fixed frequency FGAnd a feedback frequency FfTo obtain a given frequency FGAnd a feedback frequency FfThe effective frequency difference delta f of the primary frequency modulation action is obtained through the frequency dead zone.
4. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: the effective frequency difference delta f is multiplied by the reciprocal 1/e of the difference adjustment coefficientpAnd obtaining the primary frequency modulation power adjustment quantity delta P.
5. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: under the working condition of power generation, according to the relation among the water head, power, opening degree and rotating speed of the variable-speed unit and the current water head H of the unitGAnd the power after superposition is given by PG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
6. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: under the condition that the water pump pumps water, P is given according to the relation among the water head, the power, the opening degree and the rotating speed of the variable speed unit, the current lift Hy of the water pump and the power after superpositionG2Obtain the optimized opening degree Gv1And optimizing the speed of rotation N1。
7. The variable speed drive of claim 1The primary frequency modulation method of the speed regulator of the pumped storage unit is characterized by comprising the following steps: in the opening mode, the governor will optimize the opening Gv1And taking the collected guide vane opening as a guide vane opening setting as a feedback, comparing the difference between the guide vane opening setting and the feedback, performing PI regulation, and adjusting the guide vane opening.
8. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: in the speed mode, the speed N will be optimized1The set value of the rotating speed of the speed regulator is used as the set value of the rotating speed of the speed regulator, the collected set rotating speed is used as feedback, the difference value of the set value of the rotating speed and the feedback value is compared, and PID regulation is carried out;
the PID output quantity is converted into a speed regulator opening degree adjustment quantity delta Y1, a speed regulator opening degree adjustment quantity delta Y1 and an optimized opening degree Gv1Superposing the obtained target values to obtain the final guide vane opening degree, and giving the final guide vane opening degree and feeding back the guide vane opening degreevfComparing, and feeding back G according to the guide vane opening degreevfThe deviation of (a) is subjected to PI adjustment.
9. The variable speed pumped-storage group governor primary frequency modulation method of claim 1, wherein: in power mode, the superimposed power is given by PG2And as the power setting of the speed regulator, the collected active power of the unit is used as feedback, the difference value between the power setting and the feedback is compared, PI regulation is carried out on the difference value between the power setting and the feedback to obtain an output signal, the output signal is converted into the deviation between the opening setting and the feedback of the speed regulator, and PI regulation is carried out on the deviation between the opening setting and the feedback of the speed regulator.
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| CN115387953A (en) * | 2022-08-15 | 2022-11-25 | 中国水利水电科学研究院 | Input control method and device for speed-changing reversible type pump turbine regulating system |
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