CN114087118A - Water turbine guide vane flexible control method, system and device for inhibiting water hammer effect and storage medium - Google Patents
Water turbine guide vane flexible control method, system and device for inhibiting water hammer effect and storage medium Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
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- 206010028347 Muscle twitching Diseases 0.000 description 1
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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
- F03B15/12—Regulating, i.e. acting automatically by speed, e.g. by measuring electric frequency or liquid flow with retroactive action
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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
- F03B11/04—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator for diminishing cavitation or vibration, e.g. balancing
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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
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/183—Adjustable vanes, e.g. wicket gates
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a method, a system, a device and a storage medium for flexibly controlling guide vanes of a water turbine for inhibiting a water hammer effect, wherein the method comprises the following steps: detecting and judging whether a large disturbance occurs on the side of the power grid, and if not, keeping the speed regulator working normally; if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator; closing the guide vane through a speed regulator, and acquiring the opening degree of the guide vane based on the mechanical power negative step response amplitude to perform flexible adjustment on the guide vane; judging whether the guide vane flexible adjustment reaches the transient guide vane adjustment time, if so, opening the guide vane again through the speed regulator; the invention can effectively inhibit the water hammer effect and ensure the safety and stability of the operation of the hydroelectric machine.
Description
Technical Field
The invention relates to a method, a system and a device for flexibly controlling guide vanes of a water turbine for inhibiting a water hammer effect and a storage medium, and belongs to the technical field of power systems.
Background
The hydroelectric generating set serving as a high-quality primary frequency modulation resource in the power system has the characteristics of large capacity, quick response and low adjustment cost. However, due to the effect of the water hammer effect, the maximum value of the transient frequency difference after the fault occurs is further increased, which is not beneficial to the transient frequency safety of the power grid, and the time constant of the water hammer effect is determined by the construction conditions of the water diversion pipeline and the volute of the hydropower station and the hydraulic conditions such as the water head, and the essence of the time constant is the mechanical power back-regulation phenomenon caused by the inertia of water in the guide vane adjusting process of the hydroelectric generating set. Therefore, the water hammer effect cannot be completely overcome and eliminated, the phenomenon of water hammer reverse regulation can be weakened only by optimizing the opening and closing rules of the guide vanes,
the existing technical scheme adopts the delay action time arranged on the speed regulator of the hydroelectric generating set to eliminate the adverse effect of unbalanced system power caused by the increase of the reverse regulation power due to the water hammer effect. In the scheme, the delay time is the sum of the estimated time when the transient maximum frequency deviation occurs and the setting margin time. The estimation of the transient maximum frequency difference needs to be predicted according to the disturbance quantity of a system and needs to be adjusted in real time; the margin time needs to be considered as a comprehensive value according to the actual system. However, this solution has the following disadvantages:
1) the estimation time of the transient state maximum frequency deviation of the scheme is judged according to a plurality of fault records and by taking the fitting result of the power unbalance and the maximum frequency occurrence moment as prediction. When an actual fault occurs, the parameter is difficult to accurately estimate, firstly, the power unbalance amount when the fault occurs can be often obtained, but the transient frequency variation process is strongly coupled with the nonlinear characteristic of the power system and is related to the integral inertia level of the power grid, the adjustment parameter of a unit, the load characteristic and the fault category, so that the maximum frequency deviation moment is difficult to accurately obtain after the large disturbance of the actual power grid occurs.
2) The control strategy can cause the twitching of the opening of the guide vane at the moment of putting in the speed regulator after the time delay, further cause the impact of the rapid change of the water pressure, and cause adverse effects on mechanical parts of a water diversion system and a speed regulation system.
3) The strategy enables the primary frequency modulation capability of the hydroelectric generating set to be weakened, and is unfavorable for the transient frequency recovery process after large disturbance.
In order to achieve the effect of inhibiting the water hammer effect, the application provides a method, a system, a device and a storage medium for flexibly controlling guide vanes of a water turbine for inhibiting the water hammer effect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method, a system, a device and a storage medium for flexibly controlling guide vanes of a water turbine for inhibiting a water hammer effect, and solves the technical problem that the water hammer effect easily causes high-frequency or low-frequency accidents of a hydroelectric machine.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a turbine guide vane flexibility control method for suppressing a water hammer effect, including:
detecting and judging whether a large disturbance occurs on the side of the power grid, and if not, keeping the speed regulator working normally;
if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator;
closing the guide vane through a speed regulator, and acquiring the opening degree of the guide vane based on the mechanical power negative step response amplitude to perform flexible adjustment on the guide vane;
and judging whether the guide vane flexible adjustment reaches the transient guide vane adjustment time, if so, opening the guide vane again through the speed regulator.
Optionally, the mechanical power negative step response amplitude is:
wherein beta is the mechanical power negative step response amplitude, tmFor transient guide vane regulation of time, TwIs the water hammer time constant; g0Is the initial guide vane opening in steady state, g1The target values are adjusted for the guide vanes in the transient process,
g1＝g0+ΔGVi
wherein, Δ PiDistribution of the ith turbine set for unbalanced power in transient process, PiRated capacity, Δ GV, of the ith turbine groupiThe guide vane action quantity of the ith water turbine set.
Optionally, the expression of the guide vane opening degree is:
wherein beta is the mechanical power negative step response amplitude, g0Is the initial guide vane opening in steady state, TwIs the water hammer time constant and t is the time.
In a second aspect, the present invention provides a turbine vane compliance control system for dampening the water hammer effect, characterized in that said system comprises:
the disturbance judgment module is used for detecting and judging whether large disturbance occurs on the power grid side, and if not, the speed regulator is kept to normally work; if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator;
the flexible adjusting module is used for closing the guide vane through the speed regulator, acquiring the opening degree of the guide vane based on the flexible control parameter of the guide vane and carrying out flexible adjustment on the guide vane;
and the adjusting reset module is used for judging whether the guide vane flexible adjustment reaches the transient guide vane adjusting time, and if so, the guide vane is opened again through the speed regulator.
In a third aspect, the invention provides a turbine guide vane flexible control device for suppressing a water hammer effect, which is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of the above.
In a fourth aspect, the invention provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, performs the steps of any of the methods described above.
Compared with the prior art, the invention has the following beneficial effects:
according to the flexible control method, the system, the device and the storage medium for the guide vane of the water turbine for inhibiting the water hammer effect, the effect of inhibiting the water hammer effect is achieved by adopting the flexible guide vane control rule for the water turbine regulation in the transient process after the large disturbance of the electric power system, so that the maximum deviation value of the transient frequency can be reduced, and the capacity of a hydroelectric generating set participating in primary frequency modulation is fully exerted.
Drawings
FIG. 1 is a flow chart of a turbine guide vane flexibility control method for suppressing water hammer effect according to an embodiment of the present invention;
FIG. 2 is a comparison graph of simulation verification results of vane flexibility control and other control provided by the embodiment of the invention;
FIG. 3 is a simulation comparison diagram of vane flexibility control and ramp control provided by the embodiment of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a turbine guide vane flexibility control method for suppressing a water hammer effect, including the following steps:
s1, detecting and judging whether large disturbance occurs on the power grid side;
s2, if not, keeping the speed regulator working normally;
s3, if yes, acquiring transient guide vane adjusting time, turbine set distribution quantity of unbalanced power in a transient process and rated capacity of the turbine set, and calculating a mechanical power negative step response amplitude value through a speed regulator;
the mechanical power negative step response amplitude is:
wherein beta is a mechanical power negative step changeMagnitude of response, tmFor transient guide vane regulation of time, TwIs the water hammer time constant; g0Is the initial guide vane opening in steady state, g1The target values are adjusted for the guide vanes in the transient process,
g1＝g0+ΔGVi
wherein, Δ PiDistribution of the ith turbine set for unbalanced power in transient process, PiRated capacity, Δ GV, of the ith turbine groupiThe guide vane action quantity of the ith water turbine set.
S4, closing the guide vane through the speed regulator, and acquiring the opening degree of the guide vane based on the mechanical power negative step response amplitude to perform flexible adjustment on the guide vane;
the expression of the guide vane opening degree is as follows:
wherein beta is the mechanical power negative step response amplitude, g0Is the initial guide vane opening in steady state, TwIs the water hammer time constant and t is the time.
And S5, judging whether the guide vane flexible adjustment reaches the transient guide vane adjustment time, and if so, opening the guide vane again through the speed regulator.
The principle of the method is as follows:
the water turbine model adopts a simplified ideal water attack model, wherein TwIs the water hammer time constant, g0For the initial guide vane opening under the steady state, i.e. the opening is described as g by adopting a linear expression0The time equivalent water hammer time constant is Twg0In which P ism(s) and gv(s) are expressions for mechanical power and vane opening, respectively:
unfolding to obtain:
the formula (2) shows that the mechanical power back regulation caused by the water hammer effect is difficult to completely eliminate by optimizing the control law, but the aim of reducing the transient mechanical power reduction can be achieved by optimizing the control law.
Setting the mechanical power response as a unit step response with an amplitude of-alpha, then after a pull-type transformation there is
The belt is provided with (1)
Performing pull-type inverse transformation on the formula (4) and considering the initial value to obtain
Let t equal tmFor the time of vane movement, it should be
GV(tm)＝g1 (6)
g1The target values are adjusted for the transient process vanes.
So that the (5) is brought into (6)
Considering that the guide vane opening degree when T is 0 has a sudden change, equation (5) is rewritten as equation (8), and β and T are set touValues are discussed later, in the form of the vane when equation (8) can satisfy t ═ 0The opening is still 0 and there is no abrupt change.
Considering that the condition of formula (6) must be satisfied, there are
By making a pull-type conversion of the formula (8)
Bringing into formula (1)
Pull type inverse transformation is performed on the formula (11)
If T is takenu＝Twg0Then there is
At this time have
In conclusion, the continuity of guide vane adjustment and the negative step response characteristic of mechanical power response are considered, and the guide vane flexible control law is as follows:
1) calculating the mechanical power negative step response amplitude beta first of all by transient processPower-balanced unit distribution quantity delta PiAnd transient vane adjustment time tm(provided by AGC) to calculate the amount of vane action Δ GVi
As shown in formula (15), wherein PiIs the rated capacity of the unit.
The transient process guide vane regulating target value g1Such as (16)
g1＝g0+ΔGV (16)
Therefore, the mechanical power negative step response amplitude beta can be calculated according to the formula (17)
2) Obtaining a time domain expression for vane flexibility control as in formula (18)
The time domain simulation of the invention verifies as follows:
in order to verify the effectiveness of the guide vane flexible control strategy, verification 1 of time domain simulation is performed. Setting g0＝0.4，g1＝0.6，tm＝10s，Tw2.67s, 3 guide vane control rules are adopted to compare the reverse regulation effect of the mechanical power water hammer, and are respectively slope control (approaching the actual PID regulation process), a slow-fast-slow quadratic interpolation control rule and a guide vane flexible control rule in the invention, the simulation result is shown in figure 2, the reverse regulation of the water hammer adopting the slow-fast-slow quadratic interpolation control rule is slightly smaller than the reverse regulation of the water hammer adopting slope guide vane control, and the reverse regulation of the water hammer adopting guide vane flexible control is obviously smaller than the two guide vane controls.
In time domain simulation 2, g is set0＝0.4，g1＝0.5，tm＝5s，Tw＝2.67s，The mechanical power time domain simulation result comparing the conventional ramp control law of the guide vane with the guide vane flexible control law in the invention is shown in fig. 3.
Example two:
the embodiment of the invention provides a water turbine guide vane flexible control system for inhibiting a water hammer effect, which comprises:
the disturbance judgment module is used for detecting and judging whether large disturbance occurs on the power grid side, and if not, the speed regulator is kept to normally work; if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator;
the flexible adjusting module is used for closing the guide vane through the speed regulator, acquiring the opening degree of the guide vane based on the flexible control parameter of the guide vane and carrying out flexible adjustment on the guide vane;
and the adjusting reset module is used for judging whether the guide vane flexible adjustment reaches the transient guide vane adjusting time, and if so, the guide vane is opened again through the speed regulator.
Example three:
the embodiment of the invention provides a water turbine guide vane flexible control device for inhibiting a water hammer effect, which comprises a processor and a storage medium, wherein the processor is used for processing a water hammer signal;
a storage medium to store instructions;
the processor is configured to operate in accordance with instructions to perform steps according to any one of the methods described above.
Example four:
an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, wherein the program is configured to implement the steps of any one of the methods described above when executed by a processor.
The invention introduces and analyzes a mechanical power back regulation phenomenon caused by a water hammer effect in the initial stage of the frequency regulation process of a hydroelectric generating set after the large disturbance of a power grid, and shows that the transient frequency deviation can be further increased under the action of the water hammer effect, so that the transient frequency safety is seriously threatened, and the guide vane flexible control method for inhibiting the water hammer effect is provided. The method is used for optimizing the control rule of the guide vane of the water turbine in the transient frequency adjusting process, and the flexible control of the guide vane can be conveniently and efficiently configured to the side of the speed regulator by coordinating the AGC master station control instruction and the water turbine speed regulator side configuration instruction so as to deal with the power adjusting process of the hydroelectric generating set after various large disturbances on the power grid side.
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 a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method for controlling the flexibility of a guide vane of a water turbine for suppressing a water hammer effect, comprising:
detecting and judging whether a large disturbance occurs on the side of the power grid, and if not, keeping the speed regulator working normally;
if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator;
closing the guide vane through a speed regulator, and acquiring the opening degree of the guide vane based on the mechanical power negative step response amplitude to perform flexible adjustment on the guide vane;
and judging whether the guide vane flexible adjustment reaches the transient guide vane adjustment time, if so, opening the guide vane again through the speed regulator.
2. The turbine guide vane flexibility control method for suppressing the water hammer effect as claimed in claim 1, wherein the mechanical power negative step response amplitude is:
wherein beta is the mechanical power negative step response amplitude, tmFor transient guide vane regulation of time, TwIs the water hammer time constant; g0Is the initial guide vane opening in steady state, g1The target values are adjusted for the guide vanes in the transient process,
g1＝g0+ΔGVi
wherein, Δ PiDistribution of the ith turbine set for unbalanced power in transient process, PiRated capacity, Δ GV, of the ith turbine groupiThe guide vane action quantity of the ith water turbine set.
3. The method for controlling the flexibility of the guide vane of the water turbine for suppressing the water hammer effect as claimed in claim 1, wherein the expression of the opening degree of the guide vane is:
wherein beta is the mechanical power negative step response amplitude, g0Is the initial guide vane opening in steady state, TwIs the water hammer time constant and t is the time.
4. A turbine vane compliance control system for dampening the water hammer effect, the system comprising:
the disturbance judgment module is used for detecting and judging whether large disturbance occurs on the power grid side, and if not, the speed regulator is kept to normally work; if so, acquiring the transient guide vane adjusting time, the water turbine set distribution quantity of unbalanced power in the transient process and the rated capacity of the water turbine set, and calculating the mechanical power negative step response amplitude through the speed regulator;
the flexible adjusting module is used for closing the guide vane through the speed regulator, acquiring the opening degree of the guide vane based on the flexible control parameter of the guide vane and carrying out flexible adjustment on the guide vane;
and the adjusting reset module is used for judging whether the guide vane flexible adjustment reaches the transient guide vane adjusting time, and if so, the guide vane is opened again through the speed regulator.
5. The flexible control device for the guide vane of the water turbine for inhibiting the water hammer effect is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 3.
6. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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| CN108131238A (en) * | 2017-12-21 | 2018-06-08 | 国网福建省电力有限公司 | A kind of New PID Control method for inhibiting water hammer pressure fluctuation |
| CN109962495A (en) * | 2019-01-11 | 2019-07-02 | 四川大学 | A kind of ultra-low frequency oscillation disturbance source locating and suppressing method |
| CN110824359A (en) * | 2019-11-11 | 2020-02-21 | 中国南方电网有限责任公司 | Method, system and storage medium for monitoring ultralow frequency oscillation strong negative damping unit |
| CN111507637A (en) * | 2020-04-22 | 2020-08-07 | 云南电力试验研究院(集团)有限公司 | Parameter modeling and testing method for water turbine and water diversion system for power system stability calculation |
| CN111900742A (en) * | 2020-07-02 | 2020-11-06 | 武汉大学 | Frequency modulation method of wind storage system based on double-layer cooperative control |
| CN111987736A (en) * | 2020-09-01 | 2020-11-24 | 国网四川省电力公司电力科学研究院 | Control method of direct current frequency limit controller for compensating water hammer effect of water turbine |
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