CN105743107A - Control method for frequency regulation of electric power isolated network system - Google Patents
Control method for frequency regulation of electric power isolated network system Download PDFInfo
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- CN105743107A CN105743107A CN201610242970.1A CN201610242970A CN105743107A CN 105743107 A CN105743107 A CN 105743107A CN 201610242970 A CN201610242970 A CN 201610242970A CN 105743107 A CN105743107 A CN 105743107A
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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
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Abstract
The invention discloses a control method for frequency regulation of an electric power isolated network system. The control method is characterized by comprising the following steps of step 1, setting the permanent rotating-speed difference coefficient bp, PID parameters, frequency modulation dead zone 0.05Hz, and a frequency range from minus and plus 0.05Hz to minus and plus <theta>Hz for retrieving a frequency modulation module according to power grid requirements, wherein <theta> is a positive number greater than 0.05; step 2, detecting the current unit frequency by a speed regulator; step 3, obtaining a difference value <delta>f between the current unit frequency and a rated frequency 50Hz; and step 4, performing regulation according to the numerical value range of the frequency difference <delta>f. By adoption of the method, the problems of high frequency control error, low precision and instability of the electric power system, particularly the isolated network system can be solved; therefore, accurate and stable control of the power grid frequency is realized; the electric energy quality of the power system is ensured; power grid accident extension is prevented; and rapid recovery of the power grid in faults can be realized.
Description
Technical field
The present invention relates to the control method of a kind of electric power Isolated Network System frequency regulation.
Background technology
Domestic electrical system, the biggest net, little net or lonely net, the conventional means of power grid frequency modulation generally has 2 points: one is logical
Crossing the fluctuation of detection frequency, the power load by big data quantity is added up, and by special frequency modulation model, power scheduling is to each power plant
Carrying out load setting, each power plant is adjusted gaining merit according to the load curve (data) set, thus the frequency carrying out system is adjusted
Whole, but the control requirement of frequency can not be met only in accordance with this method of adjustment；Two is that the minor swing for frequency regulates, at electromotor
In group speed regulator, controlling unit uses adjusts difference formula to carry out frequency modulation, and this formula is that the variation of frequency and unit aperture (gaining merit) is closed
System, but this formula cannot overcome intrinsic static frequency difference, it is impossible to reach being precisely controlled of frequency, and the shake of system frequency can be caused
Swing.
Fluctuation range for Isolated Network System, voltage and frequency is relatively big, is affected the most obvious by load operation.Due to it
Capacity is less, and the kinetic energy that wherein rotary inertia stores is little, therefore requires that the governing system of unit has higher sensitivity, less
Dead-band and faster dynamic response.
What power system frequency regulative mode used at present is all to adjust difference formula, is simplified as:
In formula, molecule Δ f/50 is the percentage ratio (%) of frequency difference, and denominator bp is the coefficient of state slip forever.Δ y is guide vane opening (%), its
Decide the input energy of the hydraulic turbine (or steam turbine).
In the industry, speed regulator bp is set between 3%-8%, is usually set to 4% or 6%.From formula: bp is arranged
The biggest, the regulated quantity that frequency is changed by guide vane opening is the least, and frequency modulation effect is the most inconspicuous, and static error is the biggest；Bp is arranged
Too small, the regulated quantity that frequency is changed by guide vane opening the most greatly, but easily causes hunting of frequency.Accuracy that bp is arranged, correct
Property is difficult to determine, and is difficult to obtain checking.
This tune difference formula, for the hydraulic turbine (or steam turbine) actuator controls device, is detection frequency departure, the most right
Frequency difference carries out a simple linear calculating, produces a negative sense aperture, to reduce prime mover (hydraulic turbine or steamer during high frequency
Machine) energy, lowers frequency；Low frequency produces a forward aperture, increases energy, improves rotating speed.When machine frequency is within dead band, stator
Aperture involution again is to former given numerical value, and frequency can produce secondary fluctuation, and actuator again circulates and as above adjusts.Its exist following not
Foot:
The first, domestic employing adjusts difference formula to carry out frequency modulation, this formula be only one of frequency and guide vane opening simple
Proportionate relationship, the interior contact between frequency and stator does not embody, it is impossible to reach being precisely controlled of frequency；
The second, domestic bp is usually set to 4% or 6%, and this numerical value is not through tight mathematical derivation, but experience ginseng
Number, simply uses for reference the former Soviet Union, loses science, and this parameter changes accordingly not according to different electric network compositions, adopts
The frequency optimum control of system cannot be realized by this parameter；
3rd, using in the industry tune difference formula to be adjusted, frequency returns in dead band, after power system stability, due to bp's
Negative feedback, guide vane opening can return to the aperture before action, and this involution can cause secondary concussion and the actuator of frequency
Secondary Control, if unmanned for interfering, can cyclic periodicity regulation, system frequency poor stability.
Summary of the invention
For the problems referred to above, the present invention provides the control method that a kind of electric power Isolated Network System frequency regulates, and solves power train
The FREQUENCY CONTROL error of the especially Isolated Network System of uniting is big, low precision and instability problem, thus reaches the accurate, steady of mains frequency
Fixed control, has ensured the quality of power supply of power system, has prevented power grid accident from magnifying, it is achieved the fast quick-recovery of accident electrical network.
Name Resolution:
Isolated Network System: the i.e. little net of isolated operation, a local power system or several local power systems are through public
Junction point connects, and and remaining power system in a kind of operation of power networks state electrically separated, also include special case: several units
Paired running, unit on-load and removal of load band station service.
Water-Turbine Engine Adaption device: detection rotational speed of water turbine, produces the signal proportional to rotating speed deviation, and connects to water wheels owner
Power device produces corresponding hydraulic control output.
No-load opening: unit puts into the moment of electrical network, the aperture that stator is reached after reaching rated speed.
After the decay of the coefficient bp of state slip forever: buffer unit, the slip coefficient when stable state.And slip coefficient is speed governing system
On system static characteristic curve, the negative of slope at a certain regulation operating point.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
The control method of a kind of electric power Isolated Network System frequency regulation, it is characterised in that comprise the steps:
Step 1, according to grid requirements, the coefficient bp of state slip forever, pid parameter, Regulation dead-band 0.05Hz are set and transfer tune
The frequency range of frequency module ± 0.05Hz-± θ Hz, θ are the positive number more than 0.05；
Step 2, speed regulator detect current machine class frequency；
Step 3, difference DELTA f asked between the current machine class frequency and rated frequency 50Hz that detect；
Step 4, numerical range according to frequency difference Δ f are adjusted, specific as follows:
If the absolute value of A frequency difference Δ f is more than Regulation dead-band 0.05Hz and less than θ Hz, then FM module transferred by speed regulator,
Use frequency modulation formulaUnit output is adjusted；
In formula, Δ a is guide vane opening variable quantity, and a is stator no-load opening, f0For corresponding under stator no-load opening a it is
System frequency, f1For the frequency after variation；
If the absolute value of B frequency difference Δ f is more than θ Hz, then speed regulator uses PID to control and adjusts difference formula
Unit output is adjusted；
In formula, Δ y is guide vane opening, and Δ f/50 is the percentage ratio of frequency difference；
If the absolute value of C frequency difference Δ f is less than Regulation dead-band 0.05Hz, then speed regulator exits hopping pattern.
Preferably, θ=0.1, in actual applications, according to the actual motion condition in different power stations, θ is adjustable, it is not necessary to
It is 0.1Hz.
Wherein, if the absolute value of frequency difference Δ f is more than 0.1Hz, then speed regulator uses PID to control and adjusts difference formula
Being adjusted unit output, when the absolute value of frequency difference Δ f tapers into 0.05Hz-0.1Hz, then frequency modulation transferred by speed regulator
Module, uses frequency modulation formulaUnit output is adjusted.
Combine fixed-axis rotation energy principle according to generating set power producing characteristics, invented a kind of frequency being adapted to Isolated Network System and adjusted
Joint method, essential core is by the hydraulic turbine (or steam turbine) actuator, and a kind of new frequency modulation formula is transferred in inside
Thus reaching being precisely controlled of frequency, this formula discloses frequency and the relation of unit guide vane opening, and hydroelectric power plant is sent out at the scene
Group of motors is verified in running.
The invention has the beneficial effects as follows:
1, the new frequency modulation formula of the present invention characterizes the internal relation of frequency and guide vane opening；
2, this formula is simple, clear, is embedded in prime mover actuator Controlling model easily by program means, theoretical turn
The difficulty changing application into is the least.
3, there is prime mover actuator of this formula, then can be calculated according to this formula by detection frequency fluctuation,
Going out guide vane opening (or nozzle) variable quantity of correspondence, this variable removes to be applied to the input energy of generating set again by actuator
Amount, thus reach the purpose of precisely controlling system frequency.
4, achieve accurate, the stability contorting of mains frequency, ensured the quality of power supply of power system, prevented power grid accident
Extension, it is achieved the fast quick-recovery of accident electrical network.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of speed regulator FREQUENCY CONTROL strategy of the present invention；
Fig. 2 is the schematic diagram of the torque balance of generating set rotor of the present invention；
Fig. 3 is that Xiaowan Hydropower Station 2# unit 50Hz-52Hz of the present invention regulates disturbance curve chart；
Fig. 4 is that Xiaowan Hydropower Station 2# unit 52Hz-50Hz of the present invention regulates disturbance curve chart.
Detailed description of the invention
With specific embodiment, technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings, so that ability
The technical staff in territory can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
Fixed.
The control method of a kind of electric power Isolated Network System frequency regulation, comprises the steps:
Step 1, according to grid requirements, the coefficient bp of state slip forever, pid parameter, Regulation dead-band 0.05Hz are set and transfer tune
The frequency range of frequency module ± 0.05Hz-± θ Hz, θ are the positive number more than 0.05；
Step 2, speed regulator detect current machine class frequency, and under Isolated Network System generating morphotype formula, unit frequency values is equal to electrical network
Frequency values；
Step 3, difference DELTA f asked between the current machine class frequency and rated frequency 50Hz that detect；
Step 4, numerical range according to frequency difference Δ f are adjusted, specific as follows:
If the absolute value of A frequency difference Δ f is more than Regulation dead-band 0.05Hz and less than θ Hz, then FM module transferred by speed regulator,
Use frequency modulation formulaBeing adjusted unit output, balance system is meritorious and loads, and then regulation electrical network frequency
Rate so that it is be stabilized to rated frequency 50Hz；
In formula, Δ a is guide vane opening variable quantity, and a is stator no-load opening, f0For corresponding under stator no-load opening a it is
System frequency, f1For the frequency after variation；
If the absolute value of B frequency difference Δ f is more than θ Hz, then speed regulator uses PID to control and adjusts difference formulaRight
Unit output is adjusted；
In formula, Δ y is guide vane opening, and Δ f/50 is the percentage ratio of frequency difference；
If the absolute value of C frequency difference Δ f is less than Regulation dead-band 0.05Hz, then speed regulator exits hopping pattern.
Preferably, θ=0.1.Wherein, if the absolute value of frequency difference Δ f is more than 0.1Hz, then speed regulator uses PID to control and tune is poor
FormulaUnit output is adjusted, when the absolute value of frequency difference Δ f tapers into 0.05Hz-0.1Hz
Time, then FM module transferred by speed regulator, uses frequency modulation formulaUnit output is adjusted.Should in reality
In with, according to the actual motion condition in different power stations, θ is adjustable, it is not necessary to be 0.1Hz.
As it is shown in figure 1, speed regulator is the nucleus equipment that power system frequency controls, governing system is made up of three parts,
Electric control system, hydraulic pressure executable portion and generating set frequency feedback unit.This model possesses the merit that nominal frequencies PID controls
Can, by detection frequency given (50Hz) and the deviation of frequency feedback, then deviation is carried out PID calculating, output guide blade aperture
Given, then guide vane opening is controlled, and then changes unit output, thus can regulate send in power system meritorious
And by the equilibrium relation between electric loading so that system frequency maintains in the reasonable scope.
In order to reach being precisely controlled of frequency, adding new FM module, this module, with new frequency modulation formula as means, is got rid of
The PID closed loop having abandoned routine calculates, but uses the method directly calculated frequency itself, theoretically, precisely extrapolates and needs
Guide vane opening amount to be regulated, thus remove action stator with a definite target in view, owing to this guide vane opening and frequency exist in certainty
In contact, it is possible to reach accurate, the quick control of frequency.This model is transferred in ± 0.05Hz-± 0.1Hz frequency range,
Outside ± 0.1Hz, use conventional tune difference mode.
Frequency modulation formulaDerivation as follows:
The generating operating of turbine-generator units is it is believed that be rigid body fixed-axis rotation under inertial system, and its rotational kinetic energy can table
It is shown as:
In formula, J is the rotary inertia of unit, and its numerical value depends on structure and the quality of unit, for definite value；ω is unit angle
Speed, ω=2 π n, n are rotating speed.
According to conservation of energy principle analysis, if whole power system frequency reduces, it is meant that unit sends meritorious inadequate,
If system prime mover actuator does not regulates, the self-balancing ability of system can make generating unit speed reduce, and saves energy and comes more
Mend power load breach.If the rotation function that unit is reduced by every unit in time, input energy by respective actuator
(being directly proportional to guide vane opening, equivalence driving moment TP) gives accurate compensation in time, just can reach the rapid recovery of system frequency.
Calculate derivation below and be also based on this essential idea.
According to Thevenin's theorem, all for electrical network generating sets are equivalent to a unit, now power system can be seen
Making this form of unit on-load to account for, unit rotational kinetic energy and input energy present a kind of isolated balance, imply that one
The corresponding stable generating unit speed of stable energy input.As in figure 2 it is shown, this unit output size directly affects system frequency
Rate.Understanding, every unit has " no-load opening " a, ignores the electromagnetic connection between unit and unit electromagnetism is gained merit, say, that
This aperture makes unit maintain 50Hz rotating speed.If considering the electromagnetic torque (electromagnetism is gained merit, equivalent drag square TE) of generating set,
Speed regulator " load aperture " b (aperture more than no-load opening a, this aperture is used for doing work) equivalence can be used to offset, below
Concrete analysis:
The principle equal from power, equivalence speed torque TK=prime mover moment TP-electromagnetic torque TE；
Wherein TP∝ (a+b), TE∝ (b), thus can obtain TK∝ (a), i.e. TK=f (a).Equivalent moment thus can letter
Turn to a proportion function of guide vane opening (a), according to hydraulic turbine service performance, equivalent moment and hydraulic turbine input current
Amount is directly proportional, and input discharge is directly proportional to guide vane opening, so T can be obtainedK∝ Q=ka, k are fixed value, and Q is hydraulic turbine input
Discharge.According to fundamental physics, power is multiplied by time t equal to energy, i.e. balanced relationship:
Pt=E (2)
Output of hydraulic turbine formula knowable to again:
P=9.8QH η (3)
In formula, H is working head, and unit is rice, and η is turbine efficiency；
Bring formula (1) and (3) into above formula (2) can obtain:
It is known that ω=2 π n；N=60f/p, p are unit number of pole-pairs, can obtain ω=120 π f/p, and bringing formula (4) into can obtain:
Preset parameter in upper formula is reduced to K obtain:
In like manner, it is known that the 2nd guide vane opening position with the relation of frequency is, a1=Kf1 2；
Two formula are compared:
Be converted to:I.e.
f0For system frequency corresponding under stator no-load opening a, f1For the frequency after variation, Δ a is the stator needing action
Aperture variable quantity.From formula (5), if the isolated blob frequency of this equivalence fluctuates, aperture variation delta a is with dynamic
No-load opening a making the moment is relevant, also with frequency front and back square have relation.
Assume maintenance system 50Hz (f0=50Hz) time no-load opening be a=20%, if frequency to be adjusted to
51Hz(f1=51Hz), then the aperture amount that stator is to be openedEqually, conversed analysis, China
The steady rated frequency of power system is 50Hz, if net frequency fluctuation is to 51Hz, guide vane opening to be reduced by hydraulic turbine machine actuator
0.81%.So, if this formula stable power to be come system frequency, keep rated frequency f0Constant, then need to increase at formula (5)
Add a negative sign.I.e.If system frequency is lifted to a certain frequency, then with formula (5), essence is one
Sample.
Above-mentioned is that power system is simplified the analysis carried out, if every machine the most so regulates machine in real power system
Group rotating speed moves rated speed to, theoretically can reach being precisely controlled of frequency.From overall angle thinking, this kind of system frequency
It is stably that one constantly regulates, by the hydraulic turbine (or steam turbine) actuator, the dynamic stability that (have position and keep feature) is formed.
In big net system more due to Water-Turbine Engine Adaption device supply of material producer, Controlling model is different, therefore this invention formula
If extensively application needs certain cognition and time.In Isolated Network System, unit is few, and actuator is the most single, is more convenient for using
This formula principle.
Verification of correctness:
In order to verify the present invention, technical staff had once carried out isolated power grid mould in power station, theatre, Yunnan and voe hydroelectric power plant
Frequency disturbance test under formula, by the guide vane opening delta data before and after recording frequency disturbance, analyzes and finds, measured result and
It is the properest that theoretical values coincide.
Tables 1 and 2 is respectively power station, theatre and the Xiaowan Hydropower Station frequency disturbance test number under isolated power grid pattern
According to.Method is: the most slowly increase, subtract the mode of frequency, allows unit be respectively maintained at 50Hz, 52Hz, 48Hz and runs, and point
Do not record the guide vane opening measured value of correspondence.(under the conditions of Non-follow control, guide vane opening measured value may have small error.) simultaneously,
Use formula of the present inventionBring frequency values into and calculate theoretical guide vane opening change.Changed by guide vane opening
Theoretical value and measured value contrast find, both are closer to by numeric ratio.
Table 1
Table 2
Fig. 3 and Fig. 4 is the record wave profile of voe zero load state frequency disturbance test, and this test uses frequency PID and controls
Conventional method.Changing frequency targets value, through regulation after a while, set steady runs in frequency targets value, curve record
Machine class frequency and the measured value of guide vane opening during whole.The machine class frequency and the stator that read set steady state in curve are opened
Degree, brings formula of the present invention intoFind that its Changing Pattern matches with formula substantially, these public affairs the most provable
The correctness of formula.
In terms of application aspect, we can would be required to the frequency targets value of regulation and bring this formula into, directly calculate stator
Amount of change, it is possible to complete frequency quick, precisely regulate.
This invention, is precisely controlled link in frequency, have employed new formula.This formula clearly discloses control object frequency
Rate and the internal relation of actuator guide vane opening, frequency stable, be precisely controlled and be dependent on changing guide vane opening and complete
, by the prior Theoretical Calculation of this formula, the most directly export, it is possible to reach being precisely controlled of frequency, it is possible to quickly
Suppression frequency fluctuation, reaches accurate, stability contorting.Abandon the slip coefficient mode of state forever of conventional system FREQUENCY CONTROL employing also
Way in conjunction with PID regulative mode.
Use frequency dividing control principle, new frequency modulation formula and conventional tune difference mode to combine, unit output is controlled, flat
Meritorious and the relation of load in balance system, thus regulate Isolated Network System frequency.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description and accompanying drawing content are made convert, or it is relevant to be directly or indirectly used in other
Technical field, be the most in like manner included in the scope of patent protection of the present invention.
Claims (3)
1. the control method of an electric power Isolated Network System frequency regulation, it is characterised in that comprise the steps:
Step 1, according to grid requirements, the coefficient bp of state slip forever, pid parameter, Regulation dead-band 0.05Hz are set and transfer frequency modulation mould
The frequency range of block ± 0.05Hz-± θ Hz, θ are the positive number more than 0.05；
Step 2, speed regulator detect current machine class frequency；
Step 3, difference DELTA f asked between the current machine class frequency and rated frequency 50Hz that detect；
Step 4, numerical range according to frequency difference Δ f are adjusted, specific as follows:
If the absolute value of A frequency difference Δ f is more than Regulation dead-band 0.05Hz and less than θ Hz, then FM module transferred by speed regulator, uses
Frequency modulation formulaUnit output is adjusted；
In formula, Δ a is guide vane opening variable quantity, and a is stator no-load opening, f0For system frequency corresponding under stator no-load opening a
Rate, f1For the frequency after variation；
If the absolute value of B frequency difference Δ f is more than θ Hz, then speed regulator uses PID to control and adjusts difference formulaRight
Unit output is adjusted；
In formula, Δ y is guide vane opening, and Δ f/50 is the percentage ratio of frequency difference；
If the absolute value of C frequency difference Δ f is less than Regulation dead-band 0.05Hz, then speed regulator exits hopping pattern.
The control method of a kind of electric power Isolated Network System frequency the most according to claim 1 regulation, it is characterised in that θ=
0.1。
The control method of a kind of electric power Isolated Network System frequency the most according to claim 2 regulation, it is characterised in that if frequency difference
The absolute value of Δ f is more than 0.1Hz, then speed regulator uses PID to control and adjusts difference formulaUnit output is entered
Row regulation, when the absolute value of frequency difference Δ f tapers into 0.05Hz-0.1Hz, then FM module transferred by speed regulator, uses and adjusts
Frequently formulaUnit output is adjusted.
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| CN106026183A (en) * | 2016-07-28 | 2016-10-12 | 华自科技股份有限公司 | Water turbine speed regulator isolated network operation control method and system |
| CN109449924A (en) * | 2018-10-24 | 2019-03-08 | 南瑞集团有限公司 | The method of discrimination and device of a kind of hydroelectric power plant's governor to large and small net change working |
| CN109861298A (en) * | 2019-04-16 | 2019-06-07 | 大唐水电科学技术研究院有限公司 | A method of it improving governor primary frequency modulation and acts qualification rate |
| CN111525594A (en) * | 2020-04-23 | 2020-08-11 | 中国电力科学研究院有限公司 | Control method and device for speed regulating system of hydroelectric generating set |
| CN111969621A (en) * | 2020-07-29 | 2020-11-20 | 大唐水电科学技术研究院有限公司 | Primary frequency modulation frequency dead zone optimization method |
| CN112134311A (en) * | 2020-09-15 | 2020-12-25 | 广东电网有限责任公司韶关供电局 | Control method, device, equipment and storage medium for small hydropower station power grid |
| CN112803438A (en) * | 2021-02-25 | 2021-05-14 | 中国五环工程有限公司 | Frequency control system and method for multiple generators in isolated network operation power plant |
| CN114336740A (en) * | 2021-12-15 | 2022-04-12 | 湖北清江水电开发有限责任公司 | Hydropower station unit isolated network operation grouping adjusting system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026183A (en) * | 2016-07-28 | 2016-10-12 | 华自科技股份有限公司 | Water turbine speed regulator isolated network operation control method and system |
| CN109449924A (en) * | 2018-10-24 | 2019-03-08 | 南瑞集团有限公司 | The method of discrimination and device of a kind of hydroelectric power plant's governor to large and small net change working |
| CN109449924B (en) * | 2018-10-24 | 2021-11-05 | 南瑞集团有限公司 | Method and device for discriminating conversion of hydraulic power plant speed regulator to large and small network working conditions |
| CN109861298A (en) * | 2019-04-16 | 2019-06-07 | 大唐水电科学技术研究院有限公司 | A method of it improving governor primary frequency modulation and acts qualification rate |
| CN109861298B (en) * | 2019-04-16 | 2022-10-28 | 大唐水电科学技术研究院有限公司 | Method for improving primary frequency modulation action qualification rate of speed regulator |
| CN111525594A (en) * | 2020-04-23 | 2020-08-11 | 中国电力科学研究院有限公司 | Control method and device for speed regulating system of hydroelectric generating set |
| CN111969621A (en) * | 2020-07-29 | 2020-11-20 | 大唐水电科学技术研究院有限公司 | Primary frequency modulation frequency dead zone optimization method |
| CN112134311A (en) * | 2020-09-15 | 2020-12-25 | 广东电网有限责任公司韶关供电局 | Control method, device, equipment and storage medium for small hydropower station power grid |
| CN112803438A (en) * | 2021-02-25 | 2021-05-14 | 中国五环工程有限公司 | Frequency control system and method for multiple generators in isolated network operation power plant |
| CN114336740A (en) * | 2021-12-15 | 2022-04-12 | 湖北清江水电开发有限责任公司 | Hydropower station unit isolated network operation grouping adjusting system and method |
| CN114336740B (en) * | 2021-12-15 | 2023-10-27 | 湖北清江水电开发有限责任公司 | Group adjusting system and method for isolated network operation of hydropower station unit |
| CN117713139A (en) * | 2023-12-15 | 2024-03-15 | 南方电网科学研究院有限责任公司 | Optimized control method, device and equipment for switching operation modes of direct-current island system |
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