CN113757019B - Full-power variable-frequency water turbine working condition rapid active power response operation method and system - Google Patents

Full-power variable-frequency water turbine working condition rapid active power response operation method and system Download PDF

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CN113757019B
CN113757019B CN202111157631.0A CN202111157631A CN113757019B CN 113757019 B CN113757019 B CN 113757019B CN 202111157631 A CN202111157631 A CN 202111157631A CN 113757019 B CN113757019 B CN 113757019B
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water turbine
power
rotating speed
guide vane
change
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CN113757019A (en
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莫为泽
陈锐
薛鹏
王鑫
田娅娟
孟龙
张驰也
彭忠年
李铁友
王万鹏
赵立策
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BEIJING IWHR TECHNOLOGY CO LTD
China Institute of Water Resources and Hydropower Research
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BEIJING IWHR TECHNOLOGY CO LTD
China Institute of Water Resources and Hydropower Research
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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
    • 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
    • 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
    • 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
    • F03B3/16—Stators
    • F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
    • F03B3/183—Adjustable vanes, e.g. wicket gates
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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Abstract

The invention belongs to the technical field of pumped storage, and relates to a working condition rapid active power operation method, a working condition rapid active power operation system and a readable medium of a full-power variable frequency water turbine, which comprise the following steps: determining the opening degree of the guide vane according to the comprehensive characteristic curve of the water turbine model; keeping the opening degree of the guide vane unchanged, determining a limited range of the change of the rotating speed of the water turbine, and determining a limited change amplitude of the power of the water turbine according to the limited range; the output power of the full-power frequency converter is allowed to have step change in the limited change amplitude of the power of the water turbine, so that the rotating speed of the water turbine set is rapidly changed, the stored energy of the rotating part of the set and the output energy of the active power of the water turbine are rapidly changed in the same direction relative to a power grid, and the active power is rapidly responded. The method solves the defects of the existing pumped storage unit water turbine working condition and the conventional water turbine unit operation method, and provides a pumped storage unit operation method with millisecond-level rapid active power response capability for a power system.

Description

Full-power variable-frequency water turbine working condition rapid active power response operation method and system
Technical Field
The invention relates to a working condition rapid active power operation method, a working condition rapid active power operation system and a readable medium of a full-power variable-frequency water turbine, belongs to the technical field of pumped storage, and particularly belongs to the technical field of full-power variable-frequency pumped storage.
Background
At present, a power system presents the characteristics of high-proportion new energy and high-proportion power electronization, and the power system faces a series of new challenges in the aspects of supply and demand balance, system regulation, control protection, construction cost and the like. It is very important to develop a new energy + adjustable power supply mode research to improve the reliability and stability of the power supply side output.
The pumped storage power station is a well-known energy storage method with long service life, large capacity, high reliability, economy, mature technology and environmental friendliness. When the traditional constant-speed pumped storage unit operates under the working condition of a water turbine, the active power regulation speed is relatively low due to the limitation of the dynamic characteristic of the movable guide vane, and the actual constant-speed operation area deviates from the optimal efficiency area, so that the operation efficiency is relatively low. The alternating-current excitation variable-speed pumped storage unit developed in the 90 s of the 20 th century improves the response speed of the active power regulation of a water turbine to a certain extent by changing the rotating speed of the unit, but the variable speed range of the alternating-current excitation variable-speed pumped storage unit generally does not exceed +/-10% of rated rotating speed, so that the operation method and the regulation range are limited.
The conventional hydroelectric generating set is not provided with a frequency conversion device, participates in peak shaving of a power grid, is realized by increasing or reducing the output of a guide vane opening degree adjusting set through a speed regulator, and does not have the function of providing quick active power adjustment similar to that of electrochemical energy storage equipment for a power system.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method, a system and a readable medium for operating a full-power variable frequency water turbine with fast active power under working conditions, which solve the disadvantages of the conventional method for operating a water turbine generator set, and provide a method for operating a pumped storage unit with millisecond-level fast active power response capability for a power system.
In order to realize the purpose, the invention adopts the following technical scheme: a full-power variable-frequency water turbine working condition rapid active power response operation method comprises the following steps: determining the opening degree of the guide vane according to the comprehensive characteristic curve of the water turbine model; keeping the opening degree of the guide vane unchanged, determining a limited range of the change of the rotating speed of the water turbine, and determining a limited change amplitude of the power of the water turbine according to the limited range; the output power of the full-power frequency converter is allowed to have step change within the power limit change amplitude of the water turbine, so that the rotating speed of the unit is rapidly changed, the stored energy of the rotating part of the unit and the output energy of the active power of the water turbine are rapidly changed in the same direction relative to a power grid, and the active power is rapidly responded.
Furthermore, the active power quick response finally enables the change amplitude of the active power to be equal to the change amplitude of the power of the water turbine caused by the change of the actual rotating speed of the water turbine within the range of limiting the change of the rotating speed of the water turbine.
Further, the method for determining the opening degree of the guide vane comprises the following steps: acquiring a water turbine model comprehensive characteristic curve, selecting a unit rotating speed range of a water turbine according to the allowable minimum water turbine model efficiency and the allowable maximum pressure pulsation relative amplitude on the water turbine model comprehensive characteristic curve, determining the minimum unit rotating speed and the maximum unit rotating speed according to the unit rotating speed range, and calculating the product Q of the unit flow and the model efficiency corresponding to the minimum unit rotating speed and the maximum unit rotating speed on each equal opening degree line respectively 11 *η M* Calculating the difference between the two values, and selecting the guide vane opening corresponding to the equal opening line with the maximum difference between the two values, wherein the guide vane opening is the guide vane opening determined finally, and Q 11 Is unit flow rate, η M* Is the water turbine model efficiency.
Further, the calculation formula of the rotation speed change limiting range is as follows:
Figure BDA0003288864180000021
Figure BDA0003288864180000022
wherein n is P,max Selecting the upper limit of the prototype rotation speed change under the opening degree of the guide vane in the unit of r/min; n is P,min Selecting the lower limit of the prototype rotation speed change under the opening degree of the guide vane in the unit of r/min; n is 11,max The highest unit rotating speed and unit (r/min) in variable speed operation under the selected guide vane opening degree; n is 11,min Is the lowest unit rotating speed in variable speed operation under the selected guide vane opening degree, and the unit (r/min); d P Is the nominal diameter of the runner, H P Is the operating head.
Further, the power limit change amplitude delta P of the water turbine P,max The calculation formula of (2) is as follows:
Figure BDA0003288864180000023
wherein, P P Is the power of the water turbine, gamma P Is the water gravity, eta P Is the prototype efficiency, η, of the water turbine P ＝η M* +△η M*→P ，△η M*→P Is a constant, is a correction value of the efficiency of the model conversion to the prototype, H P Is the running head, Q 11 Is the unit flow rate.
Further, the step change of the power is realized by a unidirectional regulation method or a bidirectional regulation method.
Further, the step change amplitude of the unidirectional adjustment is smaller than or equal to the power limit change amplitude of the water turbine under the selected guide vane opening of the water turbine; the amplitude of the bidirectional adjustment step change is more than or equal to half of the negative water turbine power limit change amplitude, and less than or equal to half of the positive water turbine power limit change amplitude.
Further, the formula of the energy E stored in the rotating part of the unit is as follows:
Figure BDA0003288864180000024
wherein J is the rotational inertia of the unit, and omega is the operating angular speed of the unit;
the invention also discloses a working condition rapid active power operation system of the full-power variable-frequency water turbine, which comprises the following steps: the guide vane opening selecting module is used for determining the guide vane opening according to the comprehensive characteristic curve of the water turbine model; the step change module is used for keeping the opening of the guide vane unchanged, determining the limited range of the change of the rotating speed of the water turbine, and determining the limited change amplitude of the power of the water turbine according to the limited range; and the quick response module is used for enabling the output power of the full-power frequency converter to generate step change in the power limit change amplitude of the water turbine, so that the rotating speed of the water turbine set is quickly changed, the stored energy of the rotating part of the set and the active power output energy of the water turbine are quickly changed in the same direction relative to a power grid, and the active power quick response is realized.
The invention also relates to a computer-readable storage medium storing one or more programs, characterized in that the one or more programs comprise instructions which, when executed by a computing device, cause the computing device to perform the full-power variable frequency turbine operating mode fast active power operation method according to any of the above.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the quick active power response operation method for the working condition of the water turbine of the full-power variable-frequency pumped storage unit has the normal power generation function of a conventional water turbine and the millisecond-level quick active power response function of electrochemical energy storage equipment.
2. The scheme of the invention improves the operation flexibility of the pumped storage unit, can participate in large disturbance compensation of the power grid frequency, realizes quick response to the power grid frequency, eliminates the fluctuation output of renewable energy sources, and is favorable for the supply and demand balance and system adjustment of a power system.
3. According to the scheme, the grid collapse risk of the small grid in the power supply area with clean energy such as small hydropower, photovoltaic and the like as the main power supply can be reduced.
4. The scheme of the invention has no special requirements on the structure of the conventional generating motor, and can be used for reconstruction and upgrading projects of newly-built pumped storage power stations and hydropower stations as well as established pumped storage power stations and hydropower stations.
Drawings
Fig. 1 is a schematic diagram of a comprehensive characteristic curve of a water turbine model in an embodiment of the invention, in which: eta M* Is the water turbine model efficiency; a is 0M Is the model guide vane opening; h M Is the model test head; delta H/H M Is the relative amplitude of the pressure pulsation, and Δ H is the mixing double amplitude; the subscript opt indicates optimum.
Detailed Description
The present invention is described in detail by way of specific embodiments in order to better understand the technical direction of the present invention for those skilled in the art. It should be understood, however, that the detailed description is provided only for the purpose of better understanding of the present invention, and they should not be construed as limiting the present invention. In describing the present invention, it is to be understood that the terminology used is for the purpose of description only and is not intended to be indicative or implied of relative importance.
The invention relates to a working condition rapid active power operation method, a working condition rapid active power operation system and a readable medium of a full-power variable-frequency water turbine, wherein the working condition rapid active power operation method comprises the following steps: determining the opening degree value of the guide vane of the water turbine according to the comprehensive characteristic curve of the water turbine model; obtaining the set rotating speed change limited range of the water turbine under the selected guide vane opening; and determining the limited change amplitude of the power of the water turbine according to the limited range of the rotating speed. Through the step change of the output power of the full-power frequency converter, the rotating speed of the unit is correspondingly and rapidly changed, so that the stored energy of the rotating part of the unit and the output energy of the active power of the water turbine are rapidly changed in the same direction relative to a power grid, and the rapid response of the active power is realized. The method overcomes the defects of the existing water turbine working condition of the pumped storage unit and the conventional power generation operation method of the water turbine unit, and provides a hydroelectric generating set operation method with millisecond-level rapid active power response capability for a power system. The technical solution of the present invention is further explained by the specific embodiments with reference to the attached drawings.
Example one
The embodiment discloses a working condition rapid active power operation method of a full-power variable-frequency water turbine, which comprises the following steps of:
1. and determining the opening degree of the guide vane according to the comprehensive characteristic curve of the water turbine model.
As shown in fig. 1, the comprehensive characteristic curve of the water turbine model is a plurality of sets of equivalent curves which are drawn by taking unit rotation speed as a vertical coordinate and unit flow rate as a horizontal coordinate, wherein the equivalent curves include (but are not limited to) equal efficiency lines, equal opening degree lines, equal pressure pulsation lines and the like. In the figure, the opening a of the equal guide vane opening line oM1 ＜a oM2 ＜a oM3 ＜...＜a oMn And, model efficiency in the equal efficiency line: eta M*1 ＞η M*2 ＞η M*3 ...＞η M*n Equal pressure pulsation line Δ H 1 /H M ＜ΔH 2 /H M ＜ΔH 3 /H M A is the runaway characteristic curve, η M* 0; b is the maximum allowable pressure pulsation amplitude. And marking an allowable lowest equal efficiency line and an allowable maximum equal pressure pulsation line on the comprehensive characteristic curve of the water turbine model. Finding out the intersection point of each equal opening degree line and the allowable minimum equal efficiency line and the allowable maximum equal pressure pulsation line, such as the optimal guide vane opening degree a in figure 1 0-opt Corresponding three marked points are shown, wherein one ● represents the intersection point of the equal opening degree line and the allowed lowest equal efficiency line, two a-solidup represents the intersection point of the equal opening degree line and the allowed maximum equal pressure pulsation line, the two intersection points, namely ● and the lower a-solidup thereof, which are not lower than the lowest water turbine model efficiency and are not larger than the maximum pressure pulsation amplitude are selected, and the lower value of the unit rotating speed (corresponding to the lower a-solidup) is taken as the lowest unit rotating speed n of the opening degree 11min The higher value of the unit rotation speed (corresponding to ●) is used as the highest unit rotation speed n of the opening degree 11，max . Calculating the lowest unit rotating speed n corresponding to different guide vane opening degrees 11，min And the maximum unit speed n 11，max Respectively corresponding unit flow rate Q 11 And model efficiency η M* Difference of products, i.e. calculating | (Q) 11 ×η M* ) n11，min -(Q 11 ×η M* ) n11，max Selecting the guide vane opening degree corresponding to the equal opening degree line with the maximum difference value of the | value and the | value, wherein the guide vane opening degree is the finally determined guide vane opening degree a 0T 。
2. Maintaining guide vane opening a 0T And determining the limited range of the change of the rotating speed of the water turbine without changing, and determining the limited change amplitude of the power of the water turbine according to the limited range, wherein the limited change amplitude is used for the step change of the output power of the full-power frequency converter.
At guide vane opening degree of a 0T On the contour line of (2), the minimum output operating point (Q) is selected 11 *η M* ) n11min And a maximum power point (Q) 11 *η M* ) n11max Thus, the lowest unit rotating speed and the highest unit rotating speed during variable speed operation are obtained, and then the rotating speed change limiting range is obtained according to the lowest unit rotating speed and the highest unit rotating speed during variable speed operation. The calculation formula of the limited range of the rotating speed change is as follows:
Figure BDA0003288864180000041
Figure BDA0003288864180000042
wherein n is P，max Selecting the upper limit of the prototype rotation speed change under the opening degree of the guide vane in the unit of r/min; n is P，min Selecting the lower limit of the prototype rotation speed change under the opening degree of the guide vane in the unit of r/min; n is 11，max The highest unit rotating speed in variable speed operation under the selected guide vane opening degree is the unit (r/min); n is 11，min Is the lowest unit rotating speed in variable speed operation under the selected guide vane opening degree, and the unit (r/min); d P Is the nominal diameter of the runner, H P Is the operating head.
Maximum turbine power limit change amplitude delta P Pmax The calculation method comprises the following steps: calculating the selected guide vane opening a 0T Q corresponding to the lowest unit rotational speed and the highest unit rotational speed in the variable speed operation 11 And η M* Value according to Q 11 And η M* Value, scoreRespectively calculating the prototype water turbine power P corresponding to the lowest unit rotating speed and the highest unit rotating speed in variable speed operation Pn11，min And P Pn11，max Power limited variation amplitude delta P of water turbine Pmax Which is at most equal to the difference between the two. Namely:
Figure BDA0003288864180000051
wherein the content of the first and second substances,
wherein, P P Is the power of the water turbine, gamma P Is the water gravity, eta P Is the prototype efficiency, eta, of the water turbine P ＝η M* +Δη M*→P ，Δη M*→P Is a constant, is a correction value of the efficiency of the model conversion to the prototype, H P Is the running head, Q 11 Is the unit flow rate.
The step change of the output power of the full-power frequency converter has a unidirectional regulation mode and a bidirectional regulation mode. In the one-way regulation mode, the running speed n of the water turbine P Selected at a selected guide vane opening a 0T Upper limit n of lower speed change limit range P，max (or lower limit n) P，min ) At this time, the amplitude of the step change of the output power of the full-power frequency converter is delta P P，max (or-. DELTA.P) P，max ) (ii) a In the bidirectional regulation mode, the running speed n of the water turbine P Selected at a selected guide vane opening a 0T The amplitude of the step change of the rotating speed corresponding to the average value of the power of the water turbine in the rotating speed change limiting range is more than or equal to half of the negative limited change amplitude of the power of the water turbine and less than or equal to half of the positive limited change amplitude of the power of the water turbine, namely-1/2 delta P P，max ≤ΔP P ，≤1/2ΔP Pmax 。
3. When the output power of the full-power frequency converter changes in a step mode, the rotating speed of the set changes rapidly, so that the stored energy of the rotating part of the set changes, and meanwhile, compared with a power grid, the water turbine generates rapid power change which changes in the same direction as the stored energy of the rotating part, so that the rapid response of active power is achieved.
The formula for the stored energy E of the rotating part is:
Figure BDA0003288864180000052
wherein J is the rotational inertia of the unit, and omega is the operating angular speed of the unit;
and the active power quick response finally enables the change amplitude of the active power to be equal to the change amplitude of the power of the water turbine caused by the change of the actual rotating speed of the water turbine within the range of limiting the change of the rotating speed of the water turbine under the condition that the opening of the selected guide vane is equal to the change amplitude of the active power.
Example two
Based on the same inventive concept, the embodiment discloses a full-power variable frequency water turbine working condition rapid active power operation system, which comprises:
the guide vane opening selecting module is used for determining the guide vane opening according to the comprehensive characteristic curve of the water turbine model;
the step change module is used for keeping the opening of the guide vane unchanged, determining the limited range of the change of the rotating speed of the water turbine, and determining the limited change amplitude of the power of the water turbine according to the limited range;
and the quick response module is used for enabling the output power of the full-power frequency converter to generate step change in the power limit change amplitude of the water turbine, so that the rotating speed of the water turbine set is quickly changed, the stored energy of the rotating part of the set and the active power of the water turbine are quickly changed in a manner of increasing and decreasing in the same direction, and the quick response of the active power is realized.
EXAMPLE III
Based on the same inventive concept, the present embodiment discloses a computer readable storage medium storing one or more programs, characterized in that the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform the full power variable frequency turbine operating condition fast active power operation method according to any of the above.
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: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims. The above description is only for the specific implementation method of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application should be defined by the claims.

Claims (10)

1. A full-power variable-frequency water turbine working condition rapid active power operation method is characterized by comprising the following steps:
determining the opening degree of the guide vane according to the comprehensive characteristic curve of the water turbine model;
keeping the opening degree of the guide vane unchanged, determining a limited range of the change of the rotating speed of the water turbine, and determining a limited change amplitude of the power of the water turbine according to the limited range;
the output power of the full-power frequency converter is allowed to have step change in the limited change amplitude of the power of the water turbine, so that the rotating speed of the water turbine set is rapidly changed, the stored energy of the rotating part of the set and the output energy of the active power of the water turbine are rapidly changed in the same direction relative to a power grid, and the active power is rapidly responded.
2. The full-power variable-frequency water turbine working condition rapid active power operation method according to claim 1, characterized in that the active power rapid response finally enables the change amplitude of the active power to be equal to the change amplitude of the water turbine power caused by the change of the actual rotating speed of the water turbine within the range of limiting the change of the rotating speed of the water turbine under the condition of the selected guide vane opening.
3. The full-power variable-frequency water turbine operating mode rapid active power operation method according to claim 1, wherein the method for determining the guide vane opening degree comprises the following steps: acquiring a comprehensive characteristic curve of a water turbine model, and obtaining the lowest allowable water turbine model on the comprehensive characteristic curve of the water turbine modelSelecting the unit rotating speed range of the water turbine according to the model efficiency and the allowable maximum pressure pulsation relative amplitude, determining the lowest unit rotating speed and the highest unit rotating speed according to the unit rotating speed range, and calculating the product Q of the unit flow and the model efficiency respectively corresponding to the lowest unit rotating speed and the highest unit rotating speed on each equal opening degree line 11 *η M* Calculating the difference between the two values, and selecting the guide vane opening corresponding to the equal opening line with the maximum difference between the two values, wherein the guide vane opening is the guide vane opening determined finally, and Q 11 Is unit flow rate, η M* Is the water turbine model efficiency.
4. A full-power variable frequency water turbine operating mode fast active power operating method according to claim 3, wherein the limited range of the rotating speed variation is calculated by the formula:
Figure FDA0003750717050000011
Figure FDA0003750717050000012
wherein n is P,max Selecting the prototype upper limit of the change of the rotating speed under the opening degree of the guide vane; n is P,min Selecting the lower limit of the prototype rotation speed change under the opening degree of the guide vane; n is 11,max The highest unit rotating speed during variable speed operation under the selected guide vane opening degree; n is 11,min Is the lowest unit rotating speed in variable speed operation under the selected guide vane opening degree; d P Is the nominal diameter of the runner, H P Is the operating head.
5. The full-power variable-frequency water turbine operating mode fast active power operation method according to claim 1, characterized in that the water turbine power limit change amplitude Δ Ρ P,max The calculation formula of (c) is:
Figure FDA0003750717050000013
wherein, P P Is the power, gamma, of the water turbine P Is the water gravity, eta P Is the prototype efficiency, η, of the water turbine P ＝η M* +△η M*→P ，△η M*→P Is a constant, is a correction value of the efficiency of the model conversion to the prototype, H P Is the running head, Q 11 Is unit flow rate, D P Is the nominal diameter of the runner; p Pn11,min And P Pn11,max The power of the prototype water turbine corresponding to the lowest unit rotating speed and the highest unit rotating speed during variable-speed operation respectively.
6. The full-power variable-frequency water turbine working condition rapid active power operation method according to claim 5, characterized in that the step change of the power is realized by a unidirectional regulation method or a bidirectional regulation method.
7. The full-power variable frequency water turbine operating mode fast active power operation method as claimed in claim 6, characterized in that the step change amplitude of the unidirectional modulation is less than or equal to the power limit change amplitude of the water turbine under the selected guide vane opening of the water turbine; the amplitude of the bidirectional adjustment step change is more than or equal to half of the negative water turbine power limit change amplitude, and less than or equal to half of the positive water turbine power limit change amplitude.
8. The full-power variable frequency turbine operating mode fast active power operation method as claimed in claim 1, wherein the formula of the stored energy E of the rotating part is:
Figure FDA0003750717050000021
wherein J is the moment of inertia of the unit, and omega is the running angular speed of the unit.
9. The utility model provides a quick active power operating system of full-power frequency conversion hydraulic turbine operating mode which characterized in that includes:
the guide vane opening selecting module is used for determining the guide vane opening according to the comprehensive characteristic curve of the water turbine model;
the step change module is used for keeping the opening of the guide vane unchanged, determining the limited range of the change of the rotating speed of the water turbine, and determining the limited change amplitude of the power of the water turbine according to the limited range;
and the quick response module is used for enabling the output power of the full-power frequency converter to have step change in the limited change amplitude of the power of the water turbine, enabling the rotating speed of the water turbine set to change quickly, and causing quick change that the stored energy of the rotating part of the set and the output energy of the active power of the water turbine increase and decrease in the same direction relative to a power grid, so that the quick response of the active power is realized.
10. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform the full-power variable frequency turbine operating mode fast active power operation method of any of claims 1 to 8.
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