CN112398174B - Maximum output power determining method, device, controller and system of power generation system - Google Patents
Maximum output power determining method, device, controller and system of power generation system 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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel 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
- 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
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a maximum output power determining method, device, controller and system of power generation system, this scheme is guaranteeing that the total output power of whole power generation system keeps unchangeable under the prerequisite, obtains the actual maximum output power of power generation equipment through the power of scheduling different power generation equipment group, has improved the precision of the maximum output power of power generation equipment, and then has improved the precision of the maximum output power of whole power generation system. Moreover, the scheme does not need historical operation data and meteorological data, and a power station or power generation equipment special for evaluating the maximum output power of the system is not required to be additionally arranged, so that the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a maximum output power determining method, device, controller and system of a power generation system.
Background
When the power generation system is in a power-limited operation state, the maximum output power which can be provided by the power generation system cannot be accurately known, and management and control of the whole power generation system are not facilitated. For example, when a new energy power station is in a power-limited operation state, the maximum output power of the new energy power station cannot be accurately obtained due to the influence of uncertain factors such as weather. As another example, when the load power in the micro-grid system is smaller than the actual power that can be generated, the maximum output power of the micro-grid system cannot be accurately obtained.
In the related art, the maximum output power is predicted using the history data of the power generation system, but this method requires a large amount of history data to be recorded and additional data storage space, and moreover, this method cannot correct errors caused by the change of weather factors, so the accuracy of the prediction result is low.
Disclosure of Invention
In view of the above, the present invention aims to provide a method, a device, a controller and a system for determining the maximum output power of a power generation system, so as to solve the problems of low accuracy and the like of the maximum output power determination method in the related art, and the disclosed technical scheme is as follows:
in a first aspect, the present application provides a method of determining maximum output power of a power generation system, the method comprising:
acquiring the current output power of each power generation device in the power generation system;
dividing all power generation equipment into at least two groups comprising a reference group and a detection group according to the current output power of each power generation equipment, wherein the sum of the raisable power of the detection group is smaller than the sum of the lowerable power of the reference group;
controlling the total output power of the detection group to continuously rise according to the preset power step length, and synchronously controlling the total output power of the reference group to continuously fall according to the preset power step length;
When the sum of the output powers of the detection groups is not increased, determining that the current output power of each power generation device in the detection groups is the maximum output power of the power generation device;
and after obtaining the maximum output power of all the power generation equipment in the power generation system, calculating to obtain the maximum output power of the whole power generation system.
Optionally, the dividing all power generation devices into at least two groups including a reference group and a detection group according to the current output power of each power generation device includes:
selecting at least one power generation device from the power generation devices which do not obtain the maximum output power in the power generation system as the detection group;
at least one power generation device with the sum of the reducible power being larger than the sum of the raisable power of the detection group is selected as the reference group from the power generation devices except the detection group.
Optionally, the controlling the total output power of the detection group to continuously increase according to the preset power step length, and the synchronously controlling the total output power of the reference group to continuously decrease according to the preset power step length includes:
controlling the total output power of the detection group to increase by the preset power step length, and simultaneously controlling the total output power of the reference group to decrease by the preset power step length;
Judging whether the actual value of the total output power of the detection group is increased, if so, continuously controlling the total output power of the detection group to increase by the preset power step length, and simultaneously controlling the total output power of the reference group to decrease by the preset power step length; if not, stopping increasing the total output power of the detection group.
Optionally, determining the maximum output power of other power generation devices within the power generation system includes:
after obtaining the maximum output power of each power generation device in the detection group, restoring the output power of the reference group and the detection group to the original power value;
and re-selecting a new detection group and a reference group corresponding to the new detection group from power generation equipment of the power generation system, wherein the new detection group at least comprises one power generation equipment which does not obtain maximum output power.
Optionally, re-selecting a new detection group and a reference group corresponding to the new detection group from all power generation devices of the power generation system, including:
selecting a group different from the detection group from at least two groups contained in the power generation system as a new detection group, and selecting a reference group corresponding to the new detection group from the rest groups.
Optionally, the obtaining the maximum output power of the whole power generation system according to the maximum output power of all power generation equipment in the power generation system includes:
and calculating the sum of the maximum output power of all the power generation equipment of the power generation system to obtain the maximum output power of the power generation system.
Optionally, the method further comprises:
after a scheduling message to be put into a high-power load is obtained, calculating the difference between the current maximum power which can be output and the current output power of the power generation system to obtain the residual available power;
comparing the magnitude relation between the residual available power and the power to be put into the high-power load;
when the residual available power is larger than the power of the high-power load to be put into, determining that impact on a power grid cannot be caused after the high-power load to be put into is put into;
and when the residual available power is smaller than the power to be put into the high-power load, determining that impact is caused to the power grid after the high-power load to be put into the power system is put into the power system.
Optionally, the power generation system includes a plurality of energy power generation devices, the method further comprising:
obtaining the maximum output power and the electricity metering cost of various energy power generation equipment in the power generation system;
And selecting the energy power generation equipment capable of meeting the power scheduling requirement to supply power to the load according to the sequence of the electricity measuring cost from low to high and the maximum output power of each energy power generation equipment.
In a second aspect, the present application also provides a maximum output power determining apparatus of a power generation system, the apparatus comprising:
the first acquisition module is used for acquiring the current output power of each power generation device in the power generation system;
a first grouping module for dividing all power generation devices into at least two groupings comprising a reference combined detection group according to the current output power of each power generation device, wherein the sum of the raisable powers of the detection groups is smaller than the sum of the lowerable powers of the reference groups;
the power control module is used for controlling the total output power of the detection group to continuously rise according to the preset power step length and synchronously controlling the total output power of the reference group to continuously fall according to the preset power step length;
the first equipment maximum output power determining module is used for obtaining the maximum output power of each power generation equipment in the detection group when the total output power of the detection group is not increased any more;
and the system maximum output power determining module is used for obtaining the maximum output power of the whole power generation system according to the maximum output power of all power generation equipment in the power generation system.
Optionally, the first grouping module includes:
the detection group determining submodule is used for selecting at least one power generation device from power generation devices which do not obtain maximum output power in the power generation system as the detection group;
a reference group determination sub-module for selecting at least one power generation device whose sum of reducible power is larger than that of the detection group from power generation devices other than the detection group as the reference group.
Optionally, the power control module includes:
the first power control sub-module is used for controlling the total output power of the detection group to increase by the preset power step length and controlling the total output power of the reference group to decrease by the preset power step length;
the judging submodule is used for judging whether the actual value of the total output power of the detection group is increased, and if so, triggering the first power control submodule to continue to execute corresponding control actions; and if not, triggering the first power control sub-module to stop executing the corresponding control action.
In a third aspect, the present application also provides a controller comprising a memory having program instructions stored therein and a processor for invoking the program instructions to perform the maximum output power determination method of the power generation system of any of the first aspects.
In a fourth aspect, the present application also provides a power generation system, including: a power metering device, a plurality of power generation devices, and a controller;
the power metering device measures the current output power of each power generation device and sends the current output power to the controller;
the controller is configured to perform the maximum output power determination method of the power generation system of any one of the first aspect.
Optionally, the power generation device is a photovoltaic power generation device or a wind power generation device;
or the power generation equipment is an inversion module in an inverter;
alternatively, the power generation device includes at least two of a utility grid, an energy storage system, a photovoltaic power generation device, and a fuel engine.
According to the maximum output power determining method of the power generation system, on the premise that the total current output power of the power generation system is unchanged, all devices in the system are divided into at least two groups comprising a detection group and a reference group according to the current output power of each power generation device in the system, wherein the total power which can be raised by the detection group is smaller than the total power which can be lowered by the reference group; then, the output power of the control detection group continuously rises according to a preset power step length, and meanwhile, the output power of the control reference group continuously falls according to the preset power step length, so that the total output power of the power generation system is kept unchanged. Until the sum of the output powers of the detection groups is no longer increased, the maximum output power of each power generation device in the detection groups is obtained. And obtaining the maximum output power of all the power generation equipment in the power generation system in the same way, and finally obtaining the maximum output power of the whole system. According to the scheme, on the premise that the total output power of the whole power generation system is kept unchanged, the actual maximum output power of the power generation equipment is obtained by scheduling the power of different power generation equipment groups, the accuracy of the maximum output power of the power generation equipment is improved, and the accuracy of the maximum output power of the whole power generation system is further improved. Moreover, the scheme does not need historical operation data and meteorological data, and a power station or power generation equipment special for evaluating the maximum output power of the system is not required to be additionally arranged, so that the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power generation system according to an embodiment of the present application;
FIG. 2 is a flow chart of a method of determining maximum output power of a power generation system provided by an embodiment of the present application;
FIG. 3 is a flow chart of a power control process provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of a power control process for one example power generation system provided in an embodiment of the present application;
FIG. 5 is a flow chart of another method of determining maximum output power of a power generation system provided by an embodiment of the present application;
FIG. 6 is a flow chart of a method of determining maximum output power of yet another power generation system provided by an embodiment of the present application;
fig. 7 is a schematic structural view of a maximum output power determining device of a power generation system provided in an embodiment of the present application;
Fig. 8 is a schematic structural view of a maximum output power determining device of another power generation system provided in an embodiment of the present application;
fig. 9 is a schematic structural view of a maximum output power determining device of still another power generation system provided in the embodiment of the present application.
Detailed Description
In the related art, another method for determining the maximum output power is to calculate the maximum output power of the whole power generation system by using the maximum output power of a standard power station or power generation equipment which does not participate in scheduling, however, the method needs to occupy one power station or equipment, so that the hardware resource waste and the hardware cost are high, and the maximum output power of different power generation equipment or power stations is different, so that the obtained maximum output power of the whole power generation system is inaccurate. There is also a scheme for estimating the maximum output power of a current power station by using weather data for a photovoltaic power station or a wind power station, but this scheme requires an additional expensive power prediction device or weather prediction device, which is costly and complicated to implement.
In order to solve the technical problems, the application provides a maximum output power determining method of a power generation system, and the scheme obtains the actual maximum output power of power generation equipment by scheduling power of different power generation equipment groups on the premise of ensuring that the total output power of the whole power generation system is kept unchanged, so that the prediction precision of the maximum output power of the power generation equipment is improved, and further the prediction precision of the maximum output power of the whole power generation system is improved. Moreover, the scheme does not need historical operation data and meteorological data, and a power station or power generation equipment special for evaluating the maximum output power of the system is not required to be additionally arranged, so that the cost is reduced.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Before describing in detail the implementation of the maximum output power determination method of the power generation system, the power generation system is described with reference to fig. 1.
Referring to fig. 1, a schematic structural diagram of a power generation system provided in an embodiment of the present application is shown, where the system includes N power generation devices, a controller, a power metering device, and a power grid or load.
As shown in fig. 1, the power metering device is connected with each power generation device through a power transmission line and is used for measuring the output power of each power generation device; meanwhile, the power metering device is connected with a power grid or a load through a power transmission line and is used for measuring the power of the power grid or the load.
The controller is connected with the power metering device through a communication line and is used for receiving the power measured by the power metering device; meanwhile, the controller is also connected with each power generation device through a communication line and is used for controlling the output power value of each power generation device or receiving the actual output power value independently measured by each power generation device.
And the controller is connected with the power grid or the load through a communication line so as to monitor the power change condition of the power grid or the load in real time.
In one application scenario, the power generation system is a photovoltaic power generation system and the power generation device is a photovoltaic power generation device.
In another application scenario, the power generation system is a wind power generation system and the power generation device is a wind power generation device.
In yet another application scenario, the power generation system is an inverter comprised of a plurality of inverter modules, such as a centralized inverter.
In another application scenario, the power generation system may be a system that generates power from all or part of energy including a utility grid, wind, photovoltaic, internal combustion engine, energy storage system, etc., such as a micro-grid system.
A method for determining the maximum output power of a power generation system, which is applied to the controller of fig. 1, will be described in detail with reference to fig. 2, and may include the steps of:
s110, obtaining the current output power of each power generation device in the power generation system.
In one possible implementation, the controller receives the current output power of each power generation device measured by the power metering device.
In another possible implementation, each power generation device is internally provided with a metering device, and transmits the current output power measured by the metering device in the power generation device to the controller.
S120, dividing all power generation equipment into at least two groups comprising a reference group and a detection group according to the current output power of each power generation equipment.
Wherein the sum of the raisable power of the detection group is smaller than the sum of the lowerable power of the reference group, and the detection group comprises at least one power generation device which does not obtain the maximum output power.
In one embodiment of the present application, the process of dividing the detection group and the reference group is as follows:
selecting at least one power generation device which does not obtain maximum output power from the power generation system as a detection group; at least one power generation device with the sum of the reducible power being larger than the sum of the raisable power of the detection group is selected as a reference group from the power generation devices except the detection group.
If the reference group is denoted as group a and the detection group is denoted as group B, the power generating devices within group a, group B, need to meet the following power conditions: the sum of the reducible powers of group a is greater than the sum of the boostable powers of group B.
The sum of the reducible power of the group A refers to the corresponding reduction amount of each power generating device in the group A from the current output power to 0, namely the current output power sum of all the power generating devices in the group A.
The sum of the raisable powers of the group B refers to the power increment corresponding to the rise of each power generating device in the group B from the current output power to the corresponding rated output power, namely, the sum of the raisable powers of the group b=sum of the rated output powers of the group B-sum of the current output powers of the group B.
Thus, the power conditions met by groups a and B are as follows:
the sum of the current output powers of the A group is greater than the sum of the rated output powers of the B group and the sum of the current output powers of the B group
(1)
In the grouping process, the more and the better the power generation equipment with unknown maximum output power contained in the detection group are, so that the time consumption of the maximum output power determination process of the whole system can be shortened; however, it is necessary to ensure that a reference group satisfying the above power conditions can be obtained. The devices in the reference group may meet the power conditions described above without other constraints.
S130, controlling the total output power of the detection group to continuously rise according to a preset power step length, and continuously fall according to the preset power step length.
In one embodiment of the present application, as shown in fig. 3, the power scheduling procedure in S130 includes the steps of:
s131, controlling the total output power of the detection group to increase by a preset power step, and simultaneously controlling the total output power of the reference group to decrease by the preset power step.
The preset power step length can be set according to the actual condition of the power generation system, in order to avoid fluctuation of the output power of the whole system, the preset power step length can be set to be a smaller value, however, if the value of the preset power step length is too small, the process of reaching the maximum output power of the detection group is excessively long, so that the value of the preset power step length can be reasonably determined by comprehensively considering the two factors.
In one possible implementation manner, the preset power step size may be divided by the number of power generating devices included in the detection group to obtain a power value that each power generating device should increase, so as to control the output power of each power generating device in the detection group to increase the power value; similarly, the power value to be reduced for each device in the reference group is calculated in the same manner, and the output power of each device in the group is controlled to be reduced by the power value.
In another possible implementation, the output power of one power generation device in the detection group is controlled to be increased by a preset power step length each time until the output power of the device cannot be increased any more, and then the output power of the other device is increased until the output power of all devices in the detection group cannot be increased any more. Similarly, the output power reduction of each power generation device in the reference group is controlled in the same manner.
S132, judging whether the total output power of each power generation device in the detection group is higher than the last total output power, and if so, returning to S131; if not, the control is stopped to detect the increase of the total output power of the group, and S140 is performed.
Whether the current total output power of the detection group is increased by a preset power step length is compared with the last total output power value, if so, the output power of the detection group is continuously controlled to be increased by the preset power step length; if the current total output power is equal to the last total output power or the current total output power is increased by less than the preset power step compared with the last total output power value, it is determined that the total output power of the detection group reaches the maximum output power, at this time, the increase of the total output power of the detection group is stopped, and S140 is performed.
And S140, determining the current output power of each power generation device in the detection group as the maximum output power of each power generation device.
When the total output power of the detection group is no longer increased or the increase amplitude is smaller than the preset power step, determining the output power, namely the maximum output power, of each power generation device in the detection group.
S150, judging whether power generation equipment which does not obtain maximum output power exists in a power generation system or not; if yes, controlling each power generation device to restore to the original state, and returning to execute S120; if not, S160 is performed.
In one embodiment of the present application, if there is a power generation device that does not obtain the maximum output power in the power generation system, the output power of each power generation device of the reference group and the detection group is restored to the original power value; then, a new detection group and a reference group corresponding to the new detection group are newly selected from the power generation equipment of the power generation system.
Wherein the new detection group and the corresponding reference group satisfy the power condition shown in the above formula 1, and the new detection group includes at least one power generation device that does not obtain the maximum output power.
After the new detection group and the new reference group are obtained, the maximum output power of each power generation device in the new detection group is obtained according to the power scheduling method shown in S130.
That is, the above-described processes of S110 to S150 are repeated until the maximum output power of all the power generation devices in the power generation system is obtained.
In one possible implementation, the groups may be divided at a time according to the current output power and the rated output power of each power generation device in the power generation system, and the detection group and the corresponding reference group may be directly selected from each group, so that the power generation devices do not need to be divided into groups again each time.
For example, all power generation devices in the power generation system are divided into A, B, C groups, wherein group a is selected as a detection group for the first time and group B is selected as a reference group; selecting the group C as a detection group and the group B as a reference group for the second time; and thirdly, selecting the group B as a detection group and the group A as a reference group, namely, only one grouping is needed, but selecting different groupings as the detection groups each time, and finally obtaining the maximum output power of all power generation equipment.
In another possible implementation, when a new detection group is selected, the last grouping needs to be scrambled and the grouping needs to be performed again.
In either grouping, the detection group and the reference group require corresponding power conditions, and each time the detection group is determined, as many power generation devices for which maximum output power is not obtained are included as possible.
And S160, calculating the maximum output power of the whole power generation system according to the maximum output power of all power generation equipment in the power generation system.
The sum of the maximum output power of all the power generation devices in the power generation system is the maximum output power of the whole power generation system.
According to the maximum output power determining method of the power generation system, on the premise that the total output power of the whole power generation system is kept unchanged, the actual maximum output power of the power generation equipment is obtained by scheduling the power of different power generation equipment groups, the accuracy of the maximum output power of the power generation equipment is improved, and the accuracy of the maximum output power of the whole power generation system is further improved. Moreover, the scheme does not need historical operation data and meteorological data, and a power station or power generation equipment special for evaluating the maximum output power of the system is not required to be additionally arranged, so that the cost is reduced.
The maximum output power determination method of the above-described power generation system is described below with a specific example.
As shown in fig. 4, the power generation devices in the power station are divided into a group a, which is a reference group, and a group B, which is a detection group.
The current output power of the group A is d kilowatts, and the current output power of the group B is c kilowatts; the rated output power of the group B is (a+b+c), and the power requirements of the group A and the group B are satisfied: d > (a+b+c) -c.
The reason for this condition is that even if the maximum output power of group B can reach its rated output power, group a has a sufficient power drop margin to compensate for the increased power of group B.
In order to obtain the maximum output power value of each power generation device in the group B, the power limiting operation state of the group B device is released through communication scheduling, so that the power generation device in the group B can gradually increase the output power and finally reach the maximum value. Meanwhile, in order to ensure that the total output power of the whole power station is unchanged, the output power of the group A equipment is synchronously reduced at the same speed through communication scheduling. For example, when the output power of group B increases by B kw to the maximum output power (b+c) kw, group a synchronizes down by B kw, and only outputs d-b=f kw.
When all the devices in the B group reach the maximum power which can be output currently, the current output power value of each device in the B group is recorded and used as the maximum output power of each device in the B group.
Then, the power is regrouped and scheduled in accordance with the procedure described above, and as many devices that do not participate in the power ramp-up as possible are divided into groups B (i.e., detection groups) each time the packet is made. And obtaining the maximum output power of all the equipment in the power station according to the method, and adding the maximum output power of each equipment to obtain the maximum output power of the whole power station.
For a power station, such as a photovoltaic power station or a wind power station, with the generated power susceptible to weather factors, the process of the maximum output power determining method of the power generation system is executed at fixed time, so that the real-time maximum output power measuring and calculating value of the whole power station can be obtained at any time, and the scheduling of a power grid or the power coordination among the power stations and load equipment can be accepted at any time.
On the other hand, the application also provides another maximum output power determining method of the power generation system, which is applied to the micro-grid system, as shown in fig. 5, and the embodiment further comprises the following steps on the basis of the embodiment shown in fig. 2:
and S210, after the scheduling message to be put into the high-power load is obtained, calculating the difference between the current maximum power which can be output and the current output power of the micro-grid system, and obtaining the residual available power.
Wherein the currently outputtable maximum power of the micro grid system is obtained according to the embodiment shown in fig. 2.
S220, comparing the magnitude relation between the residual available power and the power to be put into the high-power load; if the remaining available power is greater than the power to be put into the high-power load, S230 is performed; if the remaining available power is less than the power to be put into the high-power load, S240 is performed.
S230, determining that impact is not caused to the power grid after the high-power load to be input is input.
And under the condition that the residual available power is larger than the power to be put into the high-power load, the high-power load can be normally accessed subsequently.
S240, determining that impact is caused to the power grid after the high-power load to be input is input.
In case the remaining available power is smaller than the power to be put into the high-power load, the high-power load input may be refused in order to avoid an accident of the grid.
The maximum output power determining method of the power generation system can be applied to a micro-grid system consisting of multiple energy sources, and whether a high-power load to be input causes grid faults or not can be estimated in advance, so that balance management between the load and the power generation power is achieved.
In still another aspect, the present application further provides another method for determining the maximum output power of a power generation system, which is applied to a hybrid power grid including multiple energy sources, as shown in fig. 6, after obtaining the maximum output power of each power generation device in the power grid by using the method shown in fig. 2, the method further includes the following steps:
s310, acquiring the electricity measuring cost corresponding to various energy power generation equipment in the current period.
The electricity-measuring cost refers to the comprehensive cost required by generating the unit electric quantity, and the electricity-measuring cost can be calculated in advance according to the calculation rule of the corresponding project.
S320, selecting energy power generation equipment capable of meeting power scheduling requirements to supply power to a load according to the sequence of low electricity cost and the maximum output power of each power generation equipment.
For example, when the electricity price of the public power grid is higher than the electricity price of photovoltaic and battery energy storage in daytime, the battery energy storage and photovoltaic power generation are used as much as possible to supply power to the load; and when the electricity price of the public power grid at night is lower than the electricity price of the battery energy storage, the electric energy supply load of the public power grid and the battery charging are used as much as possible, and finally, the power generation energy with the lowest power generation cost is preferentially used under the condition that the output power of the whole system meets the power utilization requirement.
According to the method provided by the embodiment, the maximum outputtable power of each power generation device is obtained in real time, and then, the electricity measuring cost of each power generation device is combined at the time, so that economic scheduling is realized, the scheduling proportion among multiple energy sources is coordinated under the condition that the output power of the whole power station meets the requirement, and the running cost of the whole power station is reduced.
Corresponding to the maximum output power determining method embodiment of the power generation system, the application also provides a maximum output power determining device embodiment of the power generation system.
Referring to fig. 7, a schematic structural diagram of a maximum output power determining device of a power generation system according to an embodiment of the present application is shown, where the device is applied to a controller for implementing power scheduling of the power generation system. As shown in fig. 7, the apparatus may include:
a first obtaining module 110, configured to obtain a current output power of each power generation device in the power generation system;
the first grouping module 120 is configured to divide all power generation devices into at least two groupings including a reference combination detection group according to the current output power of each power generation device.
Wherein the sum of the raisable powers of the detection group is smaller than the sum of the lowerable powers of the reference group.
In one embodiment of the present application, the first grouping module includes:
the detection group determination submodule is used for selecting at least one power generation device from power generation devices which do not obtain maximum output power in the power generation system as a detection group.
The reference group determination submodule is used for selecting at least one power generating device with the sum of the reducible power being larger than the sum of the raisable power of the detection group from the power generating devices except the detection group as a reference group.
The power control module 130 is configured to control the total output power of the detection group to continuously increase according to a preset power step, and the total output power of the synchronization control reference group to continuously decrease according to the preset power step.
In one embodiment of the present application, a power control module includes:
the first power control sub-module is used for controlling the total output power of the detection group to increase by a preset power step length and controlling the total output power of the reference group to reduce by the preset power step length;
the judging submodule is used for judging whether the actual value of the total output power of the detection group is increased, and if so, triggering the first power control submodule to continue to execute corresponding control actions; and if not, triggering the first power control sub-module to stop executing the corresponding control action.
The first device maximum output power determining module 140 is configured to obtain the maximum output power of each power generating device in the detection group when the total output power of the detection group is no longer increased.
When there is a device that does not obtain the maximum output power in the system, after the output power of each device is controlled to return to the original state, the first grouping module 120 is triggered to reselect at least one power generation device that needs to determine the maximum output power to form a detection group, and reselect a reference group corresponding to the new detection group.
In one embodiment of the present application, a group different from the detection group is selected as a new detection group from at least two groups included in the power generation system, and a reference group corresponding to the new detection group is selected from the remaining groups.
The trigger power control module 130 then increases the output power for the new test set while controlling the output power of the new reference set to decrease in magnitude.
The system maximum output power determining module 150 is configured to obtain the maximum output power of the entire power generation system according to the maximum output power of all the power generation devices in the power generation system.
According to the maximum output power determining device of the power generation system, on the premise that the total output power of the whole power generation system is kept unchanged, the actual maximum output power of the power generation equipment is obtained by scheduling the power of different power generation equipment groups, the accuracy of the maximum output power of the power generation equipment is improved, and the accuracy of the maximum output power of the whole power generation system is further improved. Moreover, the scheme does not need historical operation data and meteorological data, and a power station or power generation equipment special for evaluating the maximum output power of the system is not required to be additionally arranged, so that the cost is reduced.
Referring to fig. 8, a schematic structural diagram of a maximum output power determining device of another power generation system according to an embodiment of the present application is shown, where the device further includes, based on the embodiment shown in fig. 7:
the remaining available power obtaining module 210 is configured to calculate a difference between the current maximum power that can be output of the power generation system and the current output power after obtaining the scheduling message to be put into the high-power load, so as to obtain the remaining available power.
And the comparison module 220 is used for comparing the magnitude relation between the residual available power and the power to be put into the high-power load.
The first determining module 230 is configured to determine that impact is not caused to the power grid after the high-power load is input when the remaining available power is greater than the power of the high-power load.
The second determining module 240 is configured to determine that impact will be caused to the power grid after the high-power load is input when the remaining available power is less than the power of the high-power load.
The maximum output power determining device of the power generation system can be applied to a micro-grid system formed by multiple energy sources, and whether a high-power load to be input causes grid faults or not can be estimated in advance, so that balance management between the load and the power generation power is achieved.
Referring to fig. 9, a schematic structural diagram of a maximum output power determining device of another power generation system according to an embodiment of the present application is shown, where the device further includes, based on the embodiment shown in fig. 7:
the second obtaining module 310 is configured to obtain maximum output power and electricity cost of various energy power generation devices in the power generation system.
The power generation equipment selection module 320 is configured to select an energy generation equipment capable of meeting the power scheduling requirement to supply power to the load according to the maximum output power of each energy generation equipment in order of low illumination power cost.
According to the maximum output power determining device of the power generation system, the maximum outputtable power of each power generation device is obtained in real time, and then economic scheduling is carried out by combining the electricity measuring cost of each power generation device at the time, so that the scheduling proportion among multiple energy sources is coordinated under the condition that the output power of the whole power station meets the requirement, and the running cost of the whole power station is reduced.
The present application provides a controller comprising a processor and a memory having stored thereon a program executable on the processor. The processor executes the maximum output power determination method of the power generation system described above while running the program stored in the memory.
The present application also provides a storage medium executable by a computing device, in which a program is stored, which when executed by the computing device, implements the maximum output power determination method of the power generation system described above.
For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, but one of ordinary skill in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders or concurrently. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
It should be noted that the technical features described in each embodiment in this specification may be replaced or combined with each other, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
The steps in the methods of the embodiments of the present application may be sequentially adjusted, combined, and pruned according to actual needs.
The modules and sub-modules in the device and the terminal in the embodiments of the present application may be combined, divided, and deleted according to actual needs.
In the embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, the division of modules or sub-modules is merely a logical function division, and there may be other manners of division in actual implementation, for example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules or sub-modules illustrated as separate components may or may not be physically separate, and components that are modules or sub-modules may or may not be physical modules or sub-modules, i.e., may be located in one place, or may be distributed over multiple network modules or sub-modules. Some or all of the modules or sub-modules may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional module or sub-module in each embodiment of the present application may be integrated in one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated in one module. The integrated modules or sub-modules may be implemented in hardware or in software functional modules or sub-modules.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (14)
1. A maximum output power determination method of a power generation system, the method comprising:
acquiring the current output power of each power generation device in the power generation system;
dividing all power generation equipment into at least two groups comprising a reference group and a detection group according to the current output power of each power generation equipment, wherein the sum of the raisable power of the detection group is smaller than the sum of the lowerable power of the reference group;
Controlling the total output power of the detection group to continuously rise according to a preset power step length, and synchronously controlling the total output power of the reference group to continuously fall according to the preset power step length;
when the sum of the output powers of the detection groups is not increased, determining that the current output power of each power generation device in the detection groups is the maximum output power of the power generation device;
and after obtaining the maximum output power of all the power generation equipment in the power generation system, calculating to obtain the maximum output power of the whole power generation system.
2. The method of claim 1, wherein the dividing all power generation devices into at least two groups including a reference group and a detection group according to the current output power of each power generation device comprises:
selecting at least one power generation device from the power generation devices which do not obtain the maximum output power in the power generation system as the detection group;
at least one power generation device with the sum of the reducible power being larger than the sum of the raisable power of the detection group is selected as the reference group from the power generation devices except the detection group.
3. The method of claim 1, wherein controlling the total output power of the detection group to continuously increase by a preset power step size, and controlling the total output power of the reference group to continuously decrease by a preset power step size comprises:
Controlling the total output power of the detection group to increase by the preset power step length, and simultaneously controlling the total output power of the reference group to decrease by the preset power step length;
judging whether the actual value of the total output power of the detection group is increased, if so, continuously controlling the total output power of the detection group to increase by the preset power step length, and simultaneously controlling the total output power of the reference group to decrease by the preset power step length; if not, stopping increasing the total output power of the detection group.
4. The method of claim 1, wherein determining the maximum output power of other power generation equipment within the power generation system comprises:
after obtaining the maximum output power of each power generation device in the detection group, restoring the output power of the reference group and the detection group to the original power value;
and re-selecting a new detection group and a reference group corresponding to the new detection group from power generation equipment of the power generation system, wherein the new detection group at least comprises one power generation equipment which does not obtain maximum output power.
5. The method according to claim 4, wherein re-selecting a new detection group and a reference group corresponding to the new detection group from all power generation equipment of the power generation system, comprises:
Selecting a group different from the detection group from at least two groups in the power generation system as a new detection group, and selecting a reference group corresponding to the new detection group from the rest groups.
6. The method of claim 1, wherein the obtaining the maximum output power of the entire power generation system based on the maximum output power of all power generation devices in the power generation system comprises:
and calculating the sum of the maximum output power of all the power generation equipment of the power generation system to obtain the maximum output power of the power generation system.
7. The method according to claim 1, wherein the method further comprises:
after a scheduling message to be put into a high-power load is obtained, calculating the difference between the current maximum power which can be output and the current output power of the power generation system to obtain the residual available power;
comparing the magnitude relation between the residual available power and the power to be put into the high-power load;
when the residual available power is larger than the power of the high-power load to be put into, determining that impact on a power grid cannot be caused after the high-power load to be put into is put into;
and when the residual available power is smaller than the power to be put into the high-power load, determining that impact is caused to the power grid after the high-power load to be put into the power system is put into the power system.
8. The method of claim 1, wherein the power generation system comprises a plurality of energy power generation devices, the method further comprising:
obtaining the maximum output power and the electricity metering cost of various energy power generation equipment in the power generation system;
and selecting the energy power generation equipment capable of meeting the power scheduling requirement to supply power to the load according to the sequence of the electricity measuring cost from low to high and the maximum output power of each energy power generation equipment.
9. A maximum output power determination apparatus of a power generation system, characterized by comprising:
the first acquisition module is used for acquiring the current output power of each power generation device in the power generation system;
a first grouping module for dividing all power generation devices into at least two groups including a reference group and a detection group according to the current output power of each power generation device, wherein the sum of the raisable powers of the detection group is smaller than the sum of the lowerable powers of the reference group;
the power control module is used for controlling the total output power of the detection group to continuously rise according to a preset power step length and synchronously controlling the total output power of the reference group to continuously fall according to the preset power step length;
The first equipment maximum output power determining module is used for obtaining the maximum output power of each power generation equipment in the detection group when the total output power of the detection group is not increased any more;
and the system maximum output power determining module is used for obtaining the maximum output power of the whole power generation system according to the maximum output power of all power generation equipment in the power generation system.
10. The apparatus of claim 9, wherein the first grouping module comprises:
the detection group determining submodule is used for selecting at least one power generation device from power generation devices which do not obtain maximum output power in the power generation system as the detection group;
a reference group determination sub-module for selecting at least one power generation device whose sum of reducible power is larger than that of the detection group from power generation devices other than the detection group as the reference group.
11. The apparatus of claim 9, wherein the power control module comprises:
the first power control sub-module is used for controlling the total output power of the detection group to increase by the preset power step length and controlling the total output power of the reference group to decrease by the preset power step length;
The judging submodule is used for judging whether the actual value of the total output power of the detection group is increased, and if so, triggering the first power control submodule to continue to execute corresponding control actions; and if not, triggering the first power control sub-module to stop executing the corresponding control action.
12. A controller comprising a memory and a processor, the memory having program instructions stored therein, the processor for invoking the program instructions to perform the maximum output power determination method of the power generation system of any of claims 1-8.
13. A power generation system, comprising: a power metering device, a plurality of power generation devices, and a controller;
the power metering device measures the current output power of each power generation device and sends the current output power to the controller;
the controller is configured to execute the maximum output power determination method of the power generation system according to any one of claims 1 to 8.
14. The system of claim 13, wherein the power generation device is a photovoltaic power generation device or a wind power generation device;
or the power generation equipment is an inversion module in an inverter;
Alternatively, the power generation device includes at least two of a utility grid, an energy storage system, a photovoltaic power generation device, and a fuel engine.
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