CN114825427A - Frequency regulation and control method, device, equipment and storage medium - Google Patents
Frequency regulation and control method, device, equipment and storage medium Download PDFInfo
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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
- H02J3/381—Dispersed generators
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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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
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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
- H02J2300/22—The renewable source being solar energy
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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
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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Abstract
The application discloses a frequency regulation and control method, a device, equipment and a storage medium, which relate to the technical field of primary frequency modulation control of a power grid and comprise the following steps: setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points; acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction. This application is through setting up multistage frequency blind spot, and the multiple energy of comprehensive utilization energy storage, photovoltaic, wind-powered electricity generation, thermoelectricity regulates and control electric wire netting frequency, when promoting the electric wire netting and to the access of new forms of energy, has improved electric wire netting stability and electricity generation economic nature.
Description
Technical Field
The invention relates to the technical field of primary frequency modulation control of a power grid, in particular to a frequency regulation and control method, device, equipment and storage medium.
Background
Under the vision of 'double carbon', the grid-connected scale of wind power, photovoltaic and energy storage reaches a new height. With the rapid development of extra-high voltage power transmission and the construction of new energy resources such as wind power, solar energy and the like, the structure of a regional power grid becomes more and more complex, and the technical requirements on the safe and stable operation of the power grid are higher and higher. In order to limit the frequency change of a power grid, ensure the active power balance of the power grid and the stability of the frequency of the power grid while ensuring the rapid development of the power grid, the power grid provides the functional requirement of primary frequency modulation for a generator set.
According to the traditional power grid primary frequency modulation control, whether the fluctuation of the power grid frequency exceeds a frequency dead zone value specified by the power grid or not is judged, and once the fluctuation exceeds the frequency dead zone value specified by the power grid, a control system of a unit in the power grid automatically controls the increase and decrease of the active power of the unit, so that the power grid frequency is stabilized near a rated frequency. The generating load of the unit is adjusted through a fixed frequency dead zone, the adjusting mode is rough, the fluctuation of the power grid frequency near the dead zone is easily caused, and the phenomenon of underregulation or overshooting is caused.
In addition, in each large-area power grid in China, a thermal power generating unit is mainly used as a power grid frequency modulation power supply, and the output of the thermal power generating unit is adjusted to respond to the frequency change of the system. However, the thermal power generating unit has certain limitation in frequency modulation. If the thermal power generating unit has long energy conversion time (coal grinding and combustion), has an insensitive speed-regulating region, long response time lag, low climbing speed, unsuitability for short-time frequency modulation, low frequency modulation precision and the like, even reverse frequency modulation can be caused sometimes, and the frequency modulation is participated to aggravate the abrasion of the thermal power generating unit so as to damage the service life of the unit, increase the fuel consumption, improve the operation cost, increase the waste discharge and the heat reserve capacity of the system, and fail to fully exert the advantage of green power generation of new energy.
Disclosure of Invention
In view of the above, the present invention provides a frequency regulation method, device, equipment and storage medium, which can regulate and control a power grid frequency more accurately, and fully utilize advantages of new energy to improve power grid stability and power generation economy. The specific scheme is as follows:
in a first aspect, the present application discloses a frequency regulation method applied to a scheduling control layer, including:
setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points;
acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval;
selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy;
and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
Optionally, the setting of a preset number of value points to divide the grid frequency into corresponding frequency intervals based on different value points includes:
setting a preset number of numerical points, and equally dividing the preset number of numerical points into two parts to obtain a first numerical point set and a second numerical point set;
acquiring a total value of all the numerical points of the first numerical point set and rated frequency respectively to obtain corresponding high-frequency values, and acquiring absolute values of difference values of all the numerical points of the second numerical point set and the rated frequency respectively to obtain corresponding low-frequency values;
and dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.
Optionally, the dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value includes:
dividing the grid frequency into a corresponding number of frequency intervals based on the disturbance value; wherein the disturbance value comprises a first disturbance value, a second disturbance value, a third disturbance value and a fourth disturbance value; determining the maximum value of the high-frequency values as the first disturbance value, the minimum value of the high-frequency values as the second disturbance value, the maximum value of the low-frequency values as the third disturbance value, and the minimum value of the low-frequency values as the fourth disturbance value.
Optionally, the dividing the grid frequency into a corresponding number of frequency intervals based on the disturbance value includes:
determining a set of frequency values greater than or equal to the first perturbation value as a first frequency interval;
determining the set of frequency values smaller than the first perturbation value and greater than or equal to the second perturbation value as a second frequency interval;
determining the set of frequency values smaller than the second disturbance value and greater than or equal to the third disturbance value as a third frequency interval;
determining the set of frequency values smaller than the third perturbation value and greater than or equal to the fourth perturbation value as a fourth frequency interval;
determining the set of frequency values smaller than the fourth disturbance value as a fifth frequency interval.
Optionally, the obtaining the current power grid frequency and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval include:
acquiring current power grid frequency, and comparing the current power grid frequency with all disturbance values respectively to obtain corresponding comparison results;
and judging the frequency interval corresponding to the current power grid frequency based on the comparison result to obtain a target frequency interval.
Optionally, before selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy, the method further includes:
making different preset control strategies based on different frequency intervals; the preset control strategy comprises the steps of controlling load reduction and frequency modulation of a thermal power generating unit when the current power grid frequency is located in the first frequency interval or the second frequency interval, controlling wind and light storage and load increase and frequency modulation when the current power grid frequency is located in the fourth frequency interval or the fifth frequency interval, and not performing adjustment operation when the current power grid frequency is located in the third frequency interval.
Optionally, the generating a corresponding frequency modulation control instruction based on the target control policy, and sending the frequency modulation control instruction to a station control layer, so that the station control layer executes the frequency modulation control instruction includes:
and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer, so that the station control layer sends the decomposed frequency modulation control instruction to a corresponding generator set, corresponding adjustment operation is completed, and meanwhile, the operation information of each device is uploaded to the scheduling control layer in real time.
In a second aspect, the present application discloses a frequency regulation and control apparatus, applied to a scheduling control layer, including:
the interval division module is used for setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points;
the target interval determining module is used for acquiring the current power grid frequency and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval;
the strategy selection module is used for selecting a corresponding preset control strategy based on the target frequency interval so as to obtain a target control strategy;
the instruction generation module is used for generating a corresponding frequency modulation control instruction based on the target control strategy;
and the instruction sending module is used for sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
In a third aspect, the present application discloses an electronic device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the frequency regulation method as disclosed in the foregoing.
In a fourth aspect, the present application discloses a computer readable storage medium for storing a computer program; wherein the computer program when executed by a processor implements a frequency regulation method as disclosed in the preceding.
It can be seen that the present application provides a method of frequency regulation, comprising: setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points; acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; and generating a corresponding frequency modulation control command based on the target control strategy, and sending the frequency modulation control command to a station control layer so that the station control layer can execute the frequency modulation control command. Therefore, the multi-stage frequency interval is set, so that the power grid frequency can be adjusted more accurately and dynamically, the power grid frequency fluctuation amplitude is reduced, the disturbance resistance of the power system is improved, and the safety and the reliability of the power grid operation are improved. Meanwhile, the obvious advantages of quick response, flexible control and the like of new energy and battery energy storage are fully utilized, different control strategies are set for different frequency intervals, and after the current power grid frequency is determined, the control strategy corresponding to the frequency interval where the current power grid frequency is located is selected, so that intelligent complementary comprehensive frequency modulation of various energy sources is realized, and energy transformation and green development are promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a frequency regulation method disclosed herein;
FIG. 2 is a diagram of a particular system architecture disclosed herein;
FIG. 3 is a flow chart of a specific frequency tuning method disclosed herein;
FIG. 4 is a schematic diagram of frequency bin division according to the present disclosure;
FIG. 5 is a flow chart of a specific frequency tuning method disclosed herein;
fig. 6 is a schematic structural diagram of a frequency control device provided in the present application;
fig. 7 is a block diagram of an electronic device provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a frequency regulation and control method, which is applied to a scheduling control layer and is shown in figure 1, and the method comprises the following steps:
step S11: and setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points.
In this embodiment, a preset number of numerical points are set, so that the grid frequency is divided into corresponding frequency intervals based on different numerical points. It can be understood that the number of the value points determines the degree of detail of the frequency interval division, and the number of the value points can be adjusted up if the frequency is more finely adjusted. It is to be noted that dividing the grid frequency into grid frequencies in corresponding frequency intervals based on different said numerical points refers to frequency values. For example, if 4 value points are set, the grid frequency may be divided into 5 frequency intervals.
Step S12: and acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval.
In this embodiment, after the grid frequency is divided into corresponding frequency intervals based on different numerical points, the current grid frequency is obtained, and the frequency interval corresponding to the current grid frequency is determined, so as to obtain a target frequency interval. It can be understood that after the grid frequency is divided into corresponding frequency intervals based on different numerical points, a critical value of each frequency interval of the grid frequency can be obtained, the obtained current grid frequency is respectively compared with the critical values, the frequency interval corresponding to the current grid frequency is determined, and then the obtained frequency interval is determined as the target frequency interval.
Step S13: and selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy.
In this embodiment, after a target frequency interval corresponding to a current power grid frequency is obtained, a corresponding preset control strategy is selected based on the target frequency interval to obtain a target control strategy. It can be understood that the control strategies corresponding to different frequency intervals are preset before the corresponding preset control strategy is selected based on the target frequency interval. It can be understood that the thermal power generating unit and the new energy are combined through the control strategy, the green environment protection of the new energy and the quick response of battery energy storage, the flexible control, the bidirectional adjustment and other significant advantages are fully utilized, and the primary frequency modulation effect is improved.
Step S14: and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
In this embodiment, after the target control strategy is obtained, a corresponding frequency modulation control instruction is generated based on the target control strategy, and the frequency modulation control instruction is sent to the station control layer, so that the station control layer executes the frequency modulation control instruction. It is understood that, for example, as shown in fig. 2, the integrated fm control system includes two layers of architectures: a scheduling control layer and a station control layer. The dispatching control layer can perform operations such as data acquisition, frequency configuration, power generation amount estimation, power load estimation, analysis decision, coordination control and the like. The dispatching control layer is a bridge connecting the upper dispatching center and each power generation system, and predicts the power generation margin and the power consumption load electric quantity of the regional power grid by collecting data information of subsystems such as a thermal power generating unit, a wind power generating unit, a photovoltaic unit, an energy storage system, a power prediction system and a transformer substation. Meanwhile, the system is used as a control center of the whole system to carry out intelligent analysis and decision, provides frequency modulation control analysis support, forms a layered command and issues the layered command to a thermal power generating unit, a wind power generating unit, a photovoltaic unit and an energy storage system to execute, and realizes the panoramic monitoring and comprehensive frequency modulation control of the thermal power, the wind power, the photovoltaic and the energy storage four-in-one. The station control layer comprises a thermal power generating unit control system, a wind power generating unit control system, a photovoltaic unit control system and an energy storage control system. Therefore, after the corresponding frequency modulation control command is generated based on the target control strategy, the frequency modulation control command needs to be sent to the station control layer. It should be noted that the station control layer is deployed in each station, uploads the operation information of each device in real time, receives the frequency modulation control command issued by the scheduling control layer, and issues the decomposed frequency modulation control command to the corresponding area to implement individual control of each station system. The corresponding region comprises a thermal power generating unit, a wind power generating unit, a photovoltaic inverter and an energy storage control unit.
It can be seen that the present application provides a method of frequency regulation, comprising: setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points; acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction. Therefore, the multi-stage frequency interval is set, so that the power grid frequency can be adjusted more accurately and dynamically, the power grid frequency fluctuation amplitude is reduced, the disturbance resistance of the power system is improved, and the safety and the reliability of the power grid operation are improved. Meanwhile, the obvious advantages of quick response, flexible control and the like of new energy and battery energy storage are fully utilized, different control strategies are set for different frequency intervals, and after the current power grid frequency is determined, the control strategy corresponding to the frequency interval where the current power grid frequency is located is selected, so that intelligent complementary comprehensive frequency modulation of various energy sources is realized, and energy transformation and green development are promoted.
Referring to fig. 3, the embodiment of the present invention discloses a frequency regulation method, and the present embodiment further describes and optimizes the technical solution with respect to the previous embodiment.
Step S21: setting a preset number of numerical points, and equally dividing the preset number of numerical points into two parts to obtain a first numerical point set and a second numerical point set.
In this embodiment, a preset number of numerical points are set, and the preset number of numerical points are equally divided into two parts to obtain a first numerical point set and a second numerical point set. It can be understood that after the preset number of numerical points are set, when the number of the numerical points is an even number, the numerical points are directly divided equally or into two parts according to the actual situation by self-definition, so as to obtain the first numerical point set and the second numerical point set. It is to be noted that the value points are divided into two parts to ensure that a certain number of value points are present both in the frequency interval above the nominal grid frequency and in the frequency interval below the nominal grid frequency. And when the number of the numerical points is an odd number, carrying out user-defined division on the numerical points according to the actual situation to obtain a first numerical point set and a second numerical point set. For example, when 4 numerical points fs1, fs2, fs3, and fs4 are set, the four numerical points are equally divided into a first numerical point set and a second numerical point set, that is, two numerical points exist in each of the first numerical point set and the second numerical point set, the first numerical point set includes fs3 and fs4, and the second numerical point set includes fs1 and fs 2. It should be noted that the value point is a deviation value, not the grid frequency value.
Step S22: and acquiring a total value of all the numerical points of the first numerical point set and the rated frequency respectively to obtain corresponding high-frequency values, and acquiring absolute values of difference values of all the numerical points of the second numerical point set and the rated frequency respectively to obtain corresponding low-frequency values.
In this embodiment, after obtaining a first numerical value point set and a second numerical value point set, a total value obtained by adding all the numerical values of the first numerical value point set to a rated frequency respectively is obtained to obtain a corresponding high-frequency value, and an absolute value of a difference between all the numerical values of the second numerical value point set and the rated frequency is obtained to obtain a corresponding low-frequency value. It can be understood that, since the numerical points are all deviation values, the deviation values and the rated frequency are required to be correspondingly calculated to obtain the final frequency value. For example, fs3 has a value of 0.02, fs4 has a value of 0.04, fs1 has a value of 0.05, fs2 has a value of 0.03 in the first set of numerical points, all the numerical points in the first set of numerical points are added to the rated frequency, fs3 is added to the rated frequency to obtain a value of 50.02, fs4 is added to the rated frequency to obtain a value of 50.04, all the numerical points in the first set of numerical points are added to the rated frequency, so that the obtained frequency value is greater than the rated frequency value, and the obtained frequency value is determined as a high-frequency value. And acquiring the absolute value of the difference value obtained after all the numerical points of the second numerical point set respectively perform corresponding operation with the rated frequency, wherein the absolute value of the difference value between fs1 and the rated frequency is 49.95, and the absolute value of the difference value between fs2 and the rated frequency is 49.97.
Step S23: and dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.
In this embodiment, after the corresponding high-frequency value and low-frequency value are obtained, the power grid frequency is divided into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value. It is understood that the grid frequency is divided into a corresponding number of frequency intervals based on the disturbance values; wherein the disturbance value comprises a first disturbance value, a second disturbance value, a third disturbance value and a fourth disturbance value. It should be noted that the high-frequency value and the low-frequency value are respectively determined as different disturbance values, the largest value of the high-frequency values is determined as the first disturbance value, the smallest value of the high-frequency values is determined as the second disturbance value, the largest value of the low-frequency values is determined as the third disturbance value, and the smallest value of the low-frequency values is determined as the fourth disturbance value. For example, 50.04 is determined as the first disturbance value, 50.02 is determined as the second disturbance value, 49.97 is determined as the third disturbance value, and 49.95 is determined as the fourth disturbance value.
As shown in fig. 4, specifically, a set of frequency values greater than or equal to the first disturbance value is determined as a first frequency interval; determining the set of frequency values smaller than the first perturbation value and greater than or equal to the second perturbation value as a second frequency interval; determining the set of frequency values smaller than the second disturbance value and greater than or equal to the third disturbance value as a third frequency interval; determining the set of frequency values smaller than the third perturbation value and greater than or equal to the fourth perturbation value as a fourth frequency interval; determining the set of frequency values smaller than the fourth disturbance value as a fifth frequency interval. For example, a frequency range greater than or equal to 50.04 is determined as the first frequency interval; determining a frequency range smaller than 50.04 and greater than or equal to 50.02 as a second frequency interval; determining a frequency range smaller than 50.02 and larger than or equal to 49.97 as a third frequency interval; determining a frequency range smaller than 49.97 and larger than or equal to 49.95 as a fourth frequency interval; a frequency range smaller than 49.95 is determined as the fifth frequency interval.
Step S24: and acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval.
Step S25: and selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy.
Step S26: and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
For the details of the steps S24 to S26, reference may be made to the corresponding contents disclosed in the foregoing embodiments, and details are not repeated here.
It can be seen that, in the embodiment of the present application, a first numerical value point set and a second numerical value point set are obtained by dividing numerical values, then corresponding operation is performed on the numerical values in each numerical value point set and a rated frequency respectively to obtain a calculated frequency value, then a corresponding frequency interval is divided based on the calculated frequency value, a frequency interval corresponding to a current power grid frequency is determined, a target frequency interval is obtained, and then a corresponding preset control strategy is selected based on the target frequency interval to generate a corresponding frequency modulation control instruction. According to the method and the device, the multistage frequency interval is set, so that the power grid frequency can be effectively adjusted more accurately and dynamically, the power grid frequency fluctuation amplitude is reduced, and the stability, the safety and the reliability of the power grid operation are improved. The intelligent complementary comprehensive energy comprehensive frequency modulation of various energy sources is realized, energy transformation and green development are promoted, and the power generation economy of a power grid is improved.
Referring to fig. 5, the embodiment of the present invention discloses a frequency adjustment method, and the present embodiment further describes and optimizes the technical solution with respect to the previous embodiment.
Step S31: and setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points.
Step S32: and acquiring the current power grid frequency, and comparing the current power grid frequency with all the disturbance values respectively to obtain corresponding comparison results.
In this embodiment, after the grid frequency is divided into corresponding frequency intervals based on the different numerical points, the current grid frequency is obtained, and the current grid frequency is compared with all the disturbance values, so as to obtain corresponding comparison results. It can be understood that the current grid frequency is compared with all the disturbance values respectively, and when the comparison result of the current grid frequency and the two adjacent disturbance values is different, a final comparison result is obtained. For example, the current grid frequency is compared with the first disturbance value, if the current grid frequency is smaller than the first disturbance value, the current grid frequency is continuously compared with the second disturbance value, and if the current grid frequency is greater than or equal to the second disturbance value, the final comparison result is that the current grid frequency is greater than or equal to the second disturbance value and smaller than the first disturbance value.
Step S33: and judging the frequency interval corresponding to the current power grid frequency based on the comparison result to obtain a target frequency interval.
In this embodiment, the frequency interval corresponding to the current power grid frequency is determined based on the comparison result, so as to obtain a target frequency interval. It can be understood that, in the comparison process, different comparison results are obtained by comparing the current grid frequency with different disturbance values respectively, so that when the comparison results of the current grid frequency and two adjacent disturbance values are different, a final comparison result is obtained, and then the target frequency interval corresponding to the current grid frequency is determined based on the final comparison result.
Step S34: and formulating different preset control strategies based on different frequency intervals.
In this embodiment, different preset control strategies are formulated based on different frequency intervals. It can be understood that the preset control strategy comprises preferentially controlling load shedding and frequency modulation of the thermal power generating unit when the current power grid frequency is located in the first frequency interval or the second frequency interval; when the current power grid frequency is located in the fourth frequency interval or the fifth frequency interval, preferentially controlling wind-solar energy storage load increasing frequency modulation; and when the current power grid frequency is in the third frequency interval, no regulating operation is carried out.
For example, when the current grid frequency is in the first frequency interval, that is, when the current grid frequency is greater than or equal to a first disturbance value (50+ fs4), it is determined that the current frequency state is a high-frequency large disturbance, and at this time, the load reduction of the thermal power generating unit is preferentially controlled to reduce the power output of the thermal power generating unit, so that the grid frequency is reduced. When the current power grid frequency is in the second frequency interval, namely when the current power grid frequency is smaller than a first disturbance value (50+ fs4) and larger than or equal to a second disturbance value (50+ fs3), the current frequency state is determined to be high-frequency small disturbance, at the moment, the load of the thermal power generating unit is preferentially controlled to be reduced, the power output of the thermal power generating unit is reduced, the power grid frequency is reduced, meanwhile, the charging process is achieved through the combined energy storage control unit, and power grid frequency fluctuation is rapidly stabilized. It can be understood that the power generation load of the thermal power generating unit is preferentially reduced, the coal consumption can be effectively reduced, and the energy conservation and emission reduction of the whole society can be promoted. When the current grid frequency is in the third frequency interval, that is, the current grid frequency is smaller than the second disturbance value (50+ fs3) and greater than or equal to the third disturbance value (50-fs2), the grid frequency fluctuates in a smaller range above and below the rated frequency 50HZ, is basically stabilized near the rated frequency 50HZ, and is in a relatively stable micro-fluctuation state, so that in order to reduce the actions of the unit, the unit does not have a regulating effect on the micro-fluctuation of the grid frequency. When the current power grid frequency is in the fourth frequency interval, namely the current power grid frequency is smaller than a third disturbance value (50-fs2) and larger than or equal to a fourth disturbance value (50-fs1), the current frequency state is determined to be low-frequency small disturbance, at the moment, the energy storage control unit is preferentially adopted to discharge to realize rapid adjustment, energy is released into the power grid under the condition of system under-frequency, the power grid frequency disturbance is restrained, and the wind turbine generator and the photovoltaic inverter are increased to maintain the balance of generating power and load demand by adopting a control strategy of combined frequency modulation of the wind turbine generator and the photovoltaic inverter. When the current power grid frequency is in the fifth frequency interval, namely when the current power grid frequency is smaller than a fourth disturbance value (50-fs1), the current frequency state is determined to be low-frequency large disturbance, a control strategy of wind turbine generator and photovoltaic inverter combined frequency modulation is preferentially adopted at the moment, a new energy power generation load is increased, the balance of power generation power and load demand is maintained, frequency control is carried out, meanwhile, a discharge process is realized by a combined energy storage control unit, the defects of intermittent power generation and volatility of the wind turbine generator and the photovoltaic inverter are effectively overcome, power grid frequency fluctuation is rapidly stabilized, and the power quality and the system stability of the power grid are guaranteed while environmental benefits are improved by fully utilizing new energy resources. It can be understood that the coal consumption can be effectively reduced by preferentially reducing the power generation load of the thermal power generating unit at high frequency, the energy conservation and emission reduction of the whole society are promoted, and the power quality and the system stability of a power grid are ensured while the environmental benefit is improved by fully utilizing new energy resources to generate power at low frequency.
Step S35: and selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy.
Step S36: and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
In this embodiment, a corresponding frequency modulation control instruction is generated based on the target control strategy, and the frequency modulation control instruction is sent to a station control layer, so that the station control layer executes the frequency modulation control instruction. It can be understood that a corresponding frequency modulation control instruction is generated based on the target control strategy and is sent to a station control layer, so that the station control layer sends the decomposed frequency modulation control instruction to a corresponding generator set to complete corresponding adjustment operation, and simultaneously, the operation information of each device is uploaded to the scheduling control layer in real time.
For the details of the steps S31 and S35, reference may be made to the corresponding contents disclosed in the foregoing embodiments, and details are not repeated here.
It can be seen that, this application embodiment sets up the numerical point of presetting quantity, and is based on the difference the numerical point divides the electric wire netting frequency into corresponding frequency interval, acquires current electric wire netting frequency, and will current electric wire netting frequency compares with all disturbance values respectively to obtain corresponding comparative result, based on the comparative result is judged current electric wire netting frequency corresponds the frequency interval obtains the target frequency interval, then is based on the difference the frequency interval formulates different preset control strategies, based on target control strategy generates corresponding frequency modulation control command, and will frequency modulation control command sends to the station control layer, so that the station control layer carries out frequency modulation control command. By reducing the power generation load of the thermal power generating unit, the power grid stability and the power generation economy are improved while the access of the power grid to new energy is improved, the power grid frequency fluctuation amplitude is reduced, the safety and the reliability of the power grid operation are improved, the intelligent complementary comprehensive energy comprehensive frequency modulation of various energy sources is realized, and the energy transformation and the green development are promoted.
Referring to fig. 6, an embodiment of the present application further discloses a frequency regulation and control apparatus correspondingly, which is applied to a scheduling control layer, and includes:
the interval division module 11 is configured to set a preset number of numerical points, so as to divide the grid frequency into corresponding frequency intervals based on different numerical points;
a target interval determining module 12, configured to obtain a current power grid frequency, and determine a frequency interval corresponding to the current power grid frequency to obtain a target frequency interval;
a strategy selection module 13, configured to select a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy;
the instruction generating module 14 is configured to generate a corresponding frequency modulation control instruction based on the target control policy;
and the instruction sending module 15 is configured to send the frequency modulation control instruction to a station control layer, so that the station control layer executes the frequency modulation control instruction.
As can be seen, the present application includes: setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points; acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction. Therefore, the power grid frequency is adjusted more accurately and dynamically by setting the multistage frequency interval, the power grid frequency fluctuation amplitude is reduced, the disturbance resistance of a power system is improved, and the safety and the reliability of power grid operation are improved. Meanwhile, the obvious advantages of quick response, flexible control and the like of new energy and battery energy storage are fully utilized, different control strategies are set for different frequency intervals, and after the current power grid frequency is determined, the control strategy corresponding to the frequency interval where the current power grid frequency is located is selected, so that intelligent complementary comprehensive frequency modulation of various energy sources is realized, and energy transformation and green development are promoted.
In some specific embodiments, the interval dividing module 11 specifically includes:
a numerical point setting unit for setting a preset number of numerical points;
the numerical value point set dividing unit is used for dividing a preset number of numerical value points into two parts to obtain a first numerical value point set and a second numerical value point set;
a high-frequency value obtaining unit, configured to obtain a total value obtained by adding all the numerical points of the first numerical point set to a rated frequency, so as to obtain a corresponding high-frequency value;
a low-frequency value obtaining unit, configured to obtain absolute values of differences between all the numerical points of the second numerical point set and the rated frequency, respectively, so as to obtain corresponding low-frequency values;
and the frequency interval dividing unit is used for dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.
In some specific embodiments, the interval dividing module 11 specifically includes:
a disturbance value determining unit, configured to determine a maximum value of the high-frequency values as the first disturbance value, determine a minimum value of the high-frequency values as the second disturbance value, determine a maximum value of the low-frequency values as the third disturbance value, and determine a minimum value of the low-frequency values as the fourth disturbance value;
a first frequency interval determination unit configured to determine a set of frequency values greater than or equal to the first disturbance value as a first frequency interval;
a second frequency interval determination unit configured to determine the set of frequency values smaller than the first disturbance value and greater than or equal to the second disturbance value as a second frequency interval;
a third frequency interval determination unit configured to determine the set of frequency values that are smaller than the second disturbance value and greater than or equal to the third disturbance value as a third frequency interval;
a fourth frequency interval determination unit configured to determine the set of frequency values that are smaller than the third disturbance value and greater than or equal to the fourth disturbance value as a fourth frequency interval;
a fifth frequency interval determination unit configured to determine the set of frequency values smaller than the fourth disturbance value as a fifth frequency interval.
In some specific embodiments, the target interval determining module 12 specifically includes:
the frequency comparison unit is used for acquiring the current power grid frequency and comparing the current power grid frequency with all the disturbance values respectively to obtain corresponding comparison results;
and the target frequency interval determining unit is used for judging the frequency interval corresponding to the current power grid frequency based on the comparison result so as to obtain a target frequency interval.
Further, the embodiment of the application also provides electronic equipment. Fig. 7 is a block diagram of an electronic device 20 shown in accordance with an exemplary embodiment, and the contents of the diagram should not be construed as limiting the scope of use of the present application in any way.
Fig. 7 is a schematic structural diagram of an electronic device 20 according to an embodiment of the present disclosure. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input output interface 25, and a communication bus 26. The memory 22 is configured to store a computer program, and the computer program is loaded and executed by the processor 21 to implement the relevant steps in the frequency regulation method disclosed in any of the foregoing embodiments. In addition, the electronic device 20 in the present embodiment may be specifically an electronic computer.
In this embodiment, the power supply 23 is configured to provide a working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and an external device, and a communication protocol followed by the communication interface is any communication protocol applicable to the technical solution of the present application, and is not specifically limited herein; the input/output interface 25 is configured to obtain external input data or output data to the outside, and a specific interface type thereof may be selected according to specific application requirements, which is not specifically limited herein.
In addition, the storage 22 is used as a carrier for resource storage, and may be a read-only memory, a random access memory, a magnetic disk or an optical disk, etc., and the resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage manner may be a transient storage or a permanent storage.
The operating system 221 is used for managing and controlling each hardware device on the electronic device 20 and the computer program 222, and may be Windows Server, Netware, Unix, Linux, or the like. The computer program 222 may further include a computer program that can be used to perform other specific tasks in addition to the computer program that can be used to perform the frequency adjustment and control method performed by the electronic device 20 disclosed in any of the foregoing embodiments.
Further, an embodiment of the present application further discloses a storage medium, where a computer program is stored, and when the computer program is loaded and executed by a processor, the steps of the frequency adjustment and control method disclosed in any of the foregoing embodiments are implemented.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The frequency control method, apparatus, device and storage medium provided by the present invention are described in detail above, and the principle and implementation of the present invention are explained herein by applying specific examples, and the description of the above examples is only used to help understanding the method and core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A frequency regulation method is applied to a scheduling control layer and comprises the following steps:
setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points;
acquiring the current power grid frequency, and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval;
selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy;
and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
2. The method according to claim 1, wherein the setting a preset number of numerical points so as to divide the grid frequency into corresponding frequency intervals based on different numerical points comprises:
setting a preset number of numerical points, and equally dividing the preset number of numerical points into two parts to obtain a first numerical point set and a second numerical point set;
acquiring a total value of all the numerical points of the first numerical point set and rated frequency respectively to obtain corresponding high-frequency values, and acquiring absolute values of difference values of all the numerical points of the second numerical point set and the rated frequency respectively to obtain corresponding low-frequency values;
and dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.
3. The frequency regulation method of claim 2, wherein the dividing the grid frequency into a corresponding number of frequency intervals based on the high frequency value and the low frequency value comprises:
dividing the grid frequency into a corresponding number of frequency intervals based on the disturbance value; wherein the disturbance value comprises a first disturbance value, a second disturbance value, a third disturbance value and a fourth disturbance value; determining the maximum value of the high-frequency values as the first disturbance value, determining the minimum value of the high-frequency values as the second disturbance value, determining the maximum value of the low-frequency values as the third disturbance value, and determining the minimum value of the low-frequency values as the fourth disturbance value.
4. The method of claim 3, wherein the dividing the grid frequency into a corresponding number of frequency intervals based on the disturbance values comprises:
determining a set of frequency values greater than or equal to the first perturbation value as a first frequency interval;
determining the set of frequency values smaller than the first perturbation value and greater than or equal to the second perturbation value as a second frequency interval;
determining the set of frequency values smaller than the second disturbance value and greater than or equal to the third disturbance value as a third frequency interval;
determining the set of frequency values smaller than the third perturbation value and greater than or equal to the fourth perturbation value as a fourth frequency interval;
determining the set of frequency values smaller than the fourth disturbance value as a fifth frequency interval.
5. The method according to claim 3, wherein the obtaining a current grid frequency and determining the frequency interval corresponding to the current grid frequency to obtain a target frequency interval comprises:
acquiring current power grid frequency, and comparing the current power grid frequency with all disturbance values respectively to obtain corresponding comparison results;
and judging the frequency interval corresponding to the current power grid frequency based on the comparison result to obtain a target frequency interval.
6. The method of claim 4, wherein before selecting the corresponding preset control strategy based on the target frequency interval to obtain the target control strategy, the method further comprises:
making different preset control strategies based on different frequency intervals; the preset control strategy comprises the steps of controlling load reduction and frequency modulation of a thermal power generating unit when the current power grid frequency is located in the first frequency interval or the second frequency interval, controlling wind and light storage and load increase and frequency modulation when the current power grid frequency is located in the fourth frequency interval or the fifth frequency interval, and not performing adjustment operation when the current power grid frequency is located in the third frequency interval.
7. The method as claimed in any one of claims 1 to 6, wherein the generating a corresponding fm control command based on the target control policy and sending the fm control command to a station control layer, so that the station control layer executes the fm control command includes:
and generating a corresponding frequency modulation control instruction based on the target control strategy, and sending the frequency modulation control instruction to a station control layer, so that the station control layer sends the decomposed frequency modulation control instruction to a corresponding generator set, corresponding adjustment operation is completed, and meanwhile, the operation information of each device is uploaded to the scheduling control layer in real time.
8. A frequency regulation device is applied to a scheduling control layer, and comprises:
the interval division module is used for setting a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points;
the target interval determining module is used for acquiring the current power grid frequency and judging the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval;
the strategy selection module is used for selecting a corresponding preset control strategy based on the target frequency interval so as to obtain a target control strategy;
the instruction generation module is used for generating a corresponding frequency modulation control instruction based on the target control strategy;
and the instruction sending module is used for sending the frequency modulation control instruction to a station control layer so that the station control layer can execute the frequency modulation control instruction.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to carry out the steps of the frequency regulation method according to any one of claims 1 to 7.
10. A computer-readable storage medium for storing a computer program; wherein the computer program when executed by a processor implements the frequency regulation method of any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4456368A1 (en) * | 2023-04-25 | 2024-10-30 | Veo Oy | Power control unit, power generation system, and method for controlling electric power of power generation system comprising hydropower plant or wind turbine plant |
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| EP4456368A1 (en) * | 2023-04-25 | 2024-10-30 | Veo Oy | Power control unit, power generation system, and method for controlling electric power of power generation system comprising hydropower plant or wind turbine plant |
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