CN115693767A - Photovoltaic power station active power adjusting method, device, equipment and medium - Google Patents
Photovoltaic power station active power adjusting method, device, equipment and medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a medium for regulating active power of a photovoltaic power station, belonging to the technical field of photovoltaic power generation.A power to be distributed is determined according to the regulation target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit; then, determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient of each power generation unit in the photovoltaic power station; and finally, adjusting the current active power of each power generation unit to the actual adjusted power. Therefore, when the generating power of the photovoltaic power station is adjusted, the distribution correction times (distribution times are reduced to one time) are reduced, the generating power of each generating unit in the photovoltaic power station is accurately, quickly and reasonably distributed, the adjusting target power of the photovoltaic power station is tracked, the generating loss caused by the fact that an average distribution scheme needs to be adjusted for multiple times is remarkably reduced, and the generating income of the photovoltaic power station is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power station active power adjusting method, a photovoltaic power station active power adjusting device and a computer readable storage medium.
Background
With the increasing grid-connected power Generation of photovoltaic power stations, the acceptance standard of Automatic Generation Control (AGC) joint regulation of photovoltaic power stations is also higher and higher. At present, the standard of AGC joint debugging test, namely closed loop with multiple active adjustments, must be completed within 25 seconds, and the actual active curve is consistent with the target value curve, and the error is within the rated value range of 1%. For a flat-ground photovoltaic power station without the influence of shielding and the like, the output level difference of each power generation unit (an inverter or a photovoltaic sub-array) is very small, and the AGC joint debugging requirement can be quickly met only by using an open-loop control mode of average distribution. However, for photovoltaic power stations with large power generation unit output difference, such as mountain photovoltaic power stations, the power generation amount of each power generation unit at the same moment is different, one-time adjustment is difficult to achieve the target, and too many times of adjustment consume too much time.
Since the power generation capacity of each power generation unit is different and the power generation capacity of each power generation unit at the time of power adjustment cannot be known by the adjustment scheme of the average distribution, a plurality of corrections are required within an allowable adjustment period. This results in, on the one hand, the waveform being jittered and susceptible to resonant disturbances in the grid; on the other hand, when the power is raised, the target value is tracked after multiple corrections, which causes non-negligible power generation loss.
Disclosure of Invention
The invention mainly aims to provide a photovoltaic power station active power adjusting method, a photovoltaic power station active power adjusting device, photovoltaic power station active power adjusting equipment and a computer readable storage medium, and aims to solve the technical problem that the generated power of each power generating unit in a photovoltaic power station is difficult to accurately and quickly distribute when the generated power of the photovoltaic power station is adjusted in the prior art.
In order to achieve the above object, the present invention provides a method for adjusting active power of a photovoltaic power station, comprising the following steps:
determining the weight coefficient of each power generation unit in the photovoltaic power station;
determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit;
and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
Optionally, the step of determining a weight coefficient of each power generation unit in the photovoltaic power station includes:
determining a current adjusting scene corresponding to the adjusting target power, and determining a historical similar day similar to the current adjusting scene;
and determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station.
Optionally, the step of determining historical similar days similar to the current adjustment scenario includes:
acquiring current electrical parameters and current environmental parameters in the current adjusting scene;
and determining historical similar days similar to the current adjusting scene according to the current electrical parameters and the current environment parameters.
Optionally, the step of determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station includes:
determining the power ratio between the similar daily power of the preset full-emission unit and the similar daily power of all the other power generation units except the preset full-emission unit in the photovoltaic power station by taking the similar daily power of the preset full-emission unit as a reference, and taking the power ratio as the weight coefficient of all the other power generation units except the preset full-emission unit;
wherein the weight coefficient of the preset full transmitting unit is 1.
Optionally, the step of determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient includes:
and if the power generation unit is a preset full power generation unit, determining the actual regulating power of the preset full power generation unit as the current active power of the preset full power generation unit.
Optionally, the step of determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient includes:
and if the power generation units are non-preset full-emission units, determining the weight ratio between the weight coefficient of the non-preset full-emission units and the weight coefficient sum of all the non-preset full-emission units, and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight ratio corresponding to each power generation unit.
Optionally, before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes:
determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station;
and if the actual regulating power of each power generation unit is not greater than the corresponding maximum active power, executing the step of regulating the current active power of each power generation unit to the actual regulating power.
Optionally, the step of determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station includes:
and determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station according to the current active power of the preset full power generation unit and the weight coefficient of each power generation unit.
Optionally, before the step of determining the weight coefficient of each power generation unit in the photovoltaic power plant, the method further includes:
and if the power adjusting instruction corresponding to the adjusting target power of the active power of the photovoltaic power station is an instruction for lifting the active power of the photovoltaic power station, executing the step of determining the weight coefficient of each power generation unit in the photovoltaic power station.
In addition, in order to achieve the above object, the present invention further provides an active power adjusting device for a photovoltaic power station, wherein the active power adjusting device for the photovoltaic power station is configured to:
the weight coefficient determining module is used for determining the weight coefficient of each power generation unit in the photovoltaic power station;
the power to be distributed determining module is used for determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of the preset full power generating unit;
and the actual adjusting power determining module is used for determining the actual adjusting power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and adjusting the current active power of each power generation unit to the actual adjusting power.
In addition, in order to achieve the above object, the present invention further provides a photovoltaic power station active power adjusting apparatus, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the photovoltaic power plant active power regulation method as described above.
Furthermore, to achieve the above object, the present invention also provides a computer readable storage medium, having a computer program stored thereon, which when being executed by a processor, implements the steps of the photovoltaic power plant active power regulation method as described above.
The embodiment of the invention provides a photovoltaic power station active power adjusting method, a photovoltaic power station active power adjusting device, photovoltaic power station active power adjusting equipment and a computer readable storage medium, and weight coefficients of all power generation units in a photovoltaic power station are determined; determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit; and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
Firstly, determining power to be distributed according to the regulation target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit; then, determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient of each power generation unit in the photovoltaic power station; and finally, adjusting the current active power of each power generation unit to the actual adjusted power.
Compared with an average distribution strategy adopted by a photovoltaic power station with large power generation capacity difference of the power generation units, the power generation capacity and the active power of each power generation unit need to be corrected for multiple times, the preset full power generation units are controlled to be fully generated all the time, the actual regulating power of each power generation unit is calculated according to the power generation capacity and the power to be distributed of each power generation unit, and the actual regulating power is used as an active power tracking value of each power generation unit to regulate the actual active power of each corresponding power generation unit. Therefore, by providing a non-average distribution strategy, the preset full power generation unit is fixed and does not participate in limited power control, the power generation capacity of the rest power generation units is solved by taking the preset full power generation unit as a reference, a distribution scheme of power to be distributed is formulated according to the power generation capacity, and the power to be distributed is distributed to the rest power generation units. Therefore, when the generating power of the photovoltaic power station is adjusted, the distribution correction times (distribution times are reduced to one time) are reduced, the generating power of each generating unit in the photovoltaic power station is accurately, quickly and reasonably distributed, the adjusting target power of the photovoltaic power station is tracked, the generating loss caused by the fact that an average distribution scheme needs to be adjusted for many times is remarkably reduced, and the generating benefit of the photovoltaic power station is improved.
Drawings
FIG. 1 is a schematic diagram of a hardware execution environment execution device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an embodiment of a photovoltaic power plant active power regulation method of the present invention;
FIG. 3 is a schematic diagram illustrating an application of an embodiment of the method for regulating active power of a photovoltaic power plant according to the present invention;
fig. 4 is a schematic diagram of specific power values of active power data of each power generation unit at the current time and the corresponding time of a historical similar day according to an embodiment of the active power adjustment method for the photovoltaic power station;
FIG. 5 shows weight coefficients and active power (maximum active power Pmax) of an embodiment of an active power adjusting method for a photovoltaic power station according to the invention i ) And the power distribution value (actual regulated power P of each power generation unit) i ) A schematic diagram;
FIG. 6 is a schematic diagram of an average distribution strategy of an embodiment of an active power regulation method for a photovoltaic power plant of the present invention;
FIG. 7 is a schematic diagram of power tracking of an average strategy and a non-average strategy according to an embodiment of the active power regulation method for a photovoltaic power plant of the present invention;
fig. 8 is a schematic device diagram of an embodiment of an active power regulation method for a photovoltaic power plant of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an operating device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the operation device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in FIG. 1 does not constitute a limitation of the operating device and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and a computer program.
In the operating device shown in fig. 1, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the execution apparatus of the present invention may be provided in an execution apparatus that calls a computer program stored in the memory 1005 by the processor 1001 and performs the following operations:
determining the weight coefficient of each power generation unit in the photovoltaic power station;
determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit;
and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the weight coefficient of each power generation unit in the photovoltaic power station comprises the following steps:
determining a current adjusting scene corresponding to the adjusting target power, and determining a historical similar day similar to the current adjusting scene;
and determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar-daily photovoltaic power station.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the historical similar day similar to the current adjusting scene comprises the following steps:
acquiring current electrical parameters and current environmental parameters under the current adjusting scene;
and determining a historical similar day similar to the current adjusting scene according to the current electrical parameters and the current environment parameters.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station comprises the following steps:
determining the power ratio between the similar daily power of the preset full-emission unit and the similar daily power of all the other power generation units except the preset full-emission unit in the photovoltaic power station by taking the similar daily power of the preset full-emission unit as a reference, and taking the power ratio as the weight coefficient of all the other power generation units except the preset full-emission unit;
wherein the weight coefficient of the preset full sending unit is 1.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient comprises the following steps:
and if the power generation unit is a preset full power generation unit, determining the actual regulating power of the preset full power generation unit as the current active power of the preset full power generation unit.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient comprises the following steps:
and if the power generation units are non-preset full-emission units, determining the weight ratio between the weight coefficient of the non-preset full-emission units and the weight coefficient sum of all the non-preset full-emission units, and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight ratio corresponding to each power generation unit.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes:
determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station;
and if the actual regulating power of each power generation unit is not greater than the corresponding maximum active power, executing the step of regulating the current active power of each power generation unit to the actual regulating power.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
the step of determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station comprises the following steps:
and determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station according to the current active power of the preset full power generation unit and the weight coefficient of each power generation unit.
Further, the processor 1001 may call the computer program stored in the memory 1005, and also perform the following operations:
before the step of determining the weight coefficient of each power generation unit in the photovoltaic power station, the method further comprises the following steps:
and if the power adjusting instruction corresponding to the adjusting target power of the active power of the photovoltaic power station is an instruction for lifting the active power of the photovoltaic power station, executing the step of determining the weight coefficient of each power generation unit in the photovoltaic power station.
Most AGC commands are issued to the power generation units at present, an average distribution strategy is selected, and the difference of the power generation capacity of the power generation units is not considered. On one hand, the positive and negative assessment requirements on the active power tracking target deviation amount in the power grid assessment mechanism are different, the assessment severity that the tracking value is greater than the target value is far greater than that the tracking value is smaller than the target value, namely, the power loss has a certain acceptance degree. On the other hand, the tracking algorithm is mostly calculated based on a small amount of current operating data, and the difficulty in evaluating the power generation capacity of the power generation unit is high. In view of the above reasons, some tracking and adjusting strategies shorten the single instruction closed-loop period through a communication means, improve the adjusting frequency, and optimize the active power tracking and adjusting method of the photovoltaic power station, so that the power generation loss can be reduced to a certain extent, but the problems caused by the power generation capacity difference of the power generation units and the average distribution strategy are not fundamentally solved. When the power is limited (the target power of the photovoltaic power station corresponding to the AGC instruction is reduced compared with the previous power), the target value is easily and quickly tracked, and when the power is increased (the target power of the photovoltaic power station corresponding to the AGC instruction is increased compared with the previous power), the power generation capacity of each power generation unit is unknown, and the target value is tracked after multiple corrections, which obviously causes power generation loss.
Therefore, in the embodiment, when the AGC power is raised, the power generation capacity ranking of each power generation unit is obtained by sorting the historical power generation data of all the power generation units under the AGC instruction; controlling one of the power generation units to preset a full power generation unit and to generate full power all the time, and calculating the power generation capacity of each power generation unit according to the power generation capacity ranking; and calculating an active power tracking value (actual regulated power) of each power generation unit according to the power generation capacity of each power generation unit and an AGC command target value (regulated target power of active power of the photovoltaic power station). Therefore, the photovoltaic power station active power rapid adjusting method based on the power generation capacity evaluation of the power generation unit is realized, the average distribution of the tracking target is rejected, the distribution correction times are reduced, and the power generation benefit of the photovoltaic power station is improved.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of an active power adjusting method for a photovoltaic power station according to the present invention. The embodiment of the invention provides a photovoltaic power station active power adjusting method, which comprises the following steps:
step S10: and determining the weight coefficient of each power generation unit in the photovoltaic power station.
The photovoltaic power station can be a photovoltaic power station with large power generation unit output difference, such as a mountain photovoltaic power station; and the photovoltaic power station with smaller output difference of the power generation unit without influence of shielding and the like, such as a flat photovoltaic power station, can be used. In general, a plurality of power generation units of different types, such as inverters or photovoltaic sub-arrays, are present in a photovoltaic power station, and the power generation capacity of each power generation unit is different from each other. In this embodiment, the power generation capacity of the power generation unit is represented by a weight coefficient, a larger weight coefficient represents a stronger power generation capacity of the corresponding power generation unit, and the more power generation power that the corresponding power generation unit with the stronger power generation capacity can or needs to be distributed to.
Optionally, before the step of determining the weight coefficient of each power generation unit in the photovoltaic power station, the method further includes:
and if the power adjusting instruction corresponding to the adjusting target power of the active power of the photovoltaic power station is an instruction for lifting the active power of the photovoltaic power station, executing the step of determining the weight coefficient of each power generation unit in the photovoltaic power station.
Before the power generation power of each power generation unit in the photovoltaic power station is distributed by the non-average distribution strategy, whether an AGC active power instruction is an instruction for raising the active power of the photovoltaic power station is judged, and if the AGC active power instruction is the instruction for raising the active power of the photovoltaic power station, the power generation power is distributed according to the non-average distribution strategy provided by the embodiment; and if the command is the command for limiting the active power of the photovoltaic power station, the distribution is directly carried out according to an average distribution strategy.
Step S20: and determining the power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of the preset full power generation unit.
The preset full-power generation unit is one of the power generation units pre-selected from all the power generation units of the photovoltaic power station, and when the non-average distribution strategy provided by the embodiment is used for power distribution, the preset full-power generation unit always keeps the active power of the preset full-power generation unit at the beginning of distribution to perform full-power operation. Furthermore, the power generation unit with the maximum power generation capacity in all the power generation units of the photovoltaic power station is used as a preset full power generation unit, so that the actual regulation power distributed to the rest power generation units is reduced, the error of power distribution is reduced, and the accuracy of power distribution is improved. Further, an adjusting target power of the active power of the photovoltaic power station is determined according to the received AGC active power instruction, the power to be distributed is determined through the adjusting target power and the current active power of the preset full power transmission unit, and the difference between the adjusting target power and the current active power of the preset full power transmission unit is determined as the power to be distributed.
Step S30: and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
When the power to be distributed is distributed, the actual regulating power of each power generation unit in the photovoltaic power station is determined according to the power to be distributed and the weight coefficient, the power to be distributed is distributed according to the power generation capacity of each power generation unit except the preset full power generation unit, and therefore the actual regulating power of each power generation unit in the photovoltaic power station is determined. And adjusting the current active power of each power generation unit to actual adjusted power, and controlling each distribution unit to perform power generation operation according to the distributed power generation power.
In the embodiment, the weight coefficient of each power generation unit in the photovoltaic power station is determined; determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit; and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
Firstly, determining power to be distributed according to the regulation target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit; then, determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient of each power generation unit in the photovoltaic power station; and finally, adjusting the current active power of each power generation unit to the actual adjusted power.
Compared with an average distribution strategy adopted by a photovoltaic power station with large power generation capacity difference of the power generation units, the power generation capacity and the active power of each power generation unit need to be corrected for multiple times, the preset full power generation units are controlled to be fully generated all the time, the actual regulating power of each power generation unit is calculated according to the power generation capacity and the power to be distributed of each power generation unit, and the actual regulating power is used as an active power tracking value of each power generation unit to regulate the actual active power of each corresponding power generation unit. Therefore, by providing a non-average distribution strategy, the preset full power generation unit is fixed and does not participate in limited power control, the power generation capacity of each of the rest power generation units is solved by taking the preset full power generation unit as a reference, a distribution scheme of power to be distributed is formulated according to the power generation capacity, and the power to be distributed is distributed to each of the rest power generation units. Therefore, when the generating power of the photovoltaic power station is adjusted, the distribution correction times (distribution times are reduced to one time) are reduced, the generating power of each generating unit in the photovoltaic power station is accurately, quickly and reasonably distributed, the adjusting target power of the photovoltaic power station is tracked, the generating loss caused by the fact that an average distribution scheme needs to be adjusted for multiple times is remarkably reduced, and the generating income of the photovoltaic power station is improved.
In another embodiment of the method for adjusting active power of a photovoltaic power station, the step of determining a weight coefficient of each power generation unit in the photovoltaic power station includes:
determining a current adjusting scene corresponding to the adjusting target power, and determining a historical similar day similar to the current adjusting scene;
and determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station.
The current adjusting scene refers to an electrical scene and an environmental scene where the photovoltaic power station is located when the received AGC active power instruction is an instruction for lifting the active power of the photovoltaic power station to the adjusting target power. And determining historical similar days with similar current adjusting scenes according to the electrical scene and the environmental scene of the photovoltaic power station, and then determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar sunlight photovoltaic power station. Furthermore, different adjusting scenes correspond to different historical similar days, and different adjusting scenes correspond to different weight coefficients of the power generation unit.
Optionally, the step of determining a historical similar day similar to the current adjustment scenario includes:
acquiring current electrical parameters and current environmental parameters under the current adjusting scene;
and determining historical similar days similar to the current adjusting scene according to the current electrical parameters and the current environment parameters.
The current electrical parameters under the current adjusting scene include, but are not limited to, current, power generation amount and the like, the current environmental parameters under the current adjusting scene include, but are not limited to, time, temperature, irradiation and the like, historical similar days similar to the current adjusting scene are obtained through searching according to data of the current electrical parameters and the current environmental parameters, a similarity judging method mostly passes through multi-dimensional data Euclidean distance or other clustering algorithms, and a method for determining the historical similar days similar to the current adjusting scene is not limited in this embodiment.
Optionally, the step of determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar-daily photovoltaic power station includes:
determining the power ratio between the similar daily power of the preset full-emission unit and the similar daily power of all the other power generation units except the preset full-emission unit in the photovoltaic power station by taking the similar daily power of the preset full-emission unit as a reference, and taking the power ratio as the weight coefficient of all the other power generation units except the preset full-emission unit;
wherein the weight coefficient of the preset full sending unit is 1.
After the historical similar days are determined, the similar day power of each power generation unit in the historical similar sunlight photovoltaic power station can be obtained. Firstly, setting the weight coefficient of a preset full-power generation unit as 1 by taking the similar daily power of the preset full-power generation unit as a reference, namely setting the preset full-power generation unit as a full-power generation unit all the time; then, determining the power ratio between the similar daily power of the preset full-power generation unit and the similar daily power of the other power generation units except the preset full-power generation unit, and taking the power ratio obtained by the conversion solution as the weight coefficient of the other power generation units.
In the embodiment, the purpose of reducing the adjustment times and tracking quickly is achieved by performing optimization and improvement on the average allocation strategy of the conventional AGC active instruction. The photovoltaic output is a typical intermittent energy source, is strongly related to weather and has strong volatility, so the difficulty is that when the photovoltaic output is unequally distributed, the power generation capacity of each power generation unit at the current moment is evaluated and determined to be a distribution value. In order to solve the difficulty, the power distribution value of each power generation unit is solved according to the power generation data of the similar calendar history and a strategy of the single unit for full power generation all the time. Namely, when an AGC power lifting instruction is received, a non-average distribution scheme is adopted to realize the quick adjustment of active power. The determination of the non-average dispensing scheme mainly comprises the following steps: determining the power generation capacity conversion weight of each power generation unit based on historical power generation data; and fixing a single power generation unit without participating in limited power control, solving the power generation capacity of each power generation unit by taking the power generation unit as a reference, and making an AGC instruction distribution scheme according to the power generation capacity. Therefore, the conversion weight for evaluating the power generation capacity of the power generation unit based on the historical power generation data of the power generation unit is more accurate and reasonable compared with that based on only the instantaneous power evaluation; controlling a single power generation unit to generate full power all the time, and obtaining the power generation capacity of each power generation unit at the current moment by a conversion method; the non-average distribution strategy can effectively reduce the first tracking error and the adjustment times, and reduce the power tracking loss; and the non-average distribution strategy is an optimization scheme of power distribution, so that the method has no hardware cost and no tracking failure risk, and the generated energy promotion effect in a long period is obvious.
In another embodiment of the method for adjusting active power of a photovoltaic power station provided by the present invention, the step of determining the actual adjusted power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient includes:
and if the power generation unit is a preset full power generation unit, determining the actual regulating power of the preset full power generation unit as the current active power of the preset full power generation unit.
In this embodiment, the power generation units in the photovoltaic power station are divided into a preset full power generation unit and the rest non-full power generation units, and different power generation units correspond to different adjustment strategies and set different actual adjustment powers. When the actual regulating power of each power generation unit in the photovoltaic power station is determined according to the power to be distributed and the weight coefficient, if the power generation unit to be regulated is a preset full power unit, the current active power of the preset full power unit when a power regulating instruction is received is determined, and the actual regulating power of the preset full power unit is set to be the current active power of the preset full power unit, so that in the process of regulating the active power of the photovoltaic power station to reach the regulating target power of the active power of the photovoltaic power station, the preset full power unit is used as a regulating reference, and the current active power of the preset full power unit is always kept unchanged.
Optionally, the step of determining the actual regulated power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient includes:
and if the power generation units are non-preset full-emission units, determining the weight ratio between the weight coefficient of the non-preset full-emission units and the weight coefficient sum of all the non-preset full-emission units, and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight ratio corresponding to each power generation unit.
When the actual adjusting power of each power generation unit in the photovoltaic power station is determined according to the power to be distributed and the weight coefficient, if the power generation unit to be adjusted is the rest power generation units which are not the preset full power generation units, the weight ratio between the weight coefficient of the non-preset full power generation unit and the weight coefficient sum of all the non-preset full power generation units needs to be determined, and then the actual adjusting power of each power generation unit in the photovoltaic power station is determined according to the power to be distributed and the weight ratio corresponding to each power generation unit. In this embodiment, a method for allocating power to be allocated and a method for determining actual adjustment power are proposed as shown in the following formulas:
wherein, P i For the actual regulation of the power, P, of the individual power-generating units in a photovoltaic power station 1 The actual regulating power of the full-load power generation unit is preset (the first power generation unit is taken as the preset full-load power generation unit for illustration), P is the regulating target power of the active power of the photovoltaic power station, and P-P 1 To be allocated power, K i The weight coefficient of each power generation unit in the photovoltaic power station,
the weight coefficient sum of all non-preset full sending units.
In this embodiment, a non-average distribution strategy is provided, the preset full power generation unit is fixed and does not participate in the limited power control, the power generation capacity of each of the other power generation units is solved by taking the preset full power generation unit as a reference, a distribution scheme of power to be distributed is formulated according to the power generation capacity, and the power to be distributed is distributed to each of the other power generation units. Therefore, when the generating power of the photovoltaic power station is adjusted, the distribution correction times (distribution times are reduced to one time) are reduced, the generating power of each generating unit in the photovoltaic power station is accurately, quickly and reasonably distributed, the adjusting target power of the photovoltaic power station is tracked, the generating loss caused by the fact that an average distribution scheme needs to be adjusted for multiple times is remarkably reduced, and the generating income of the photovoltaic power station is improved.
In another embodiment of the method for adjusting the active power of the photovoltaic power plant, before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes:
determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station;
and if the actual regulating power of each power generation unit is not greater than the corresponding maximum active power, executing the step of regulating the current active power of each power generation unit to the actual regulating power.
In the actual operation process of the photovoltaic power station, errors may occur in each parameter in the formulas of the distribution method of the power to be distributed and the actual adjustment power determination method, for example, errors may occur in the actual adjustment power of a preset full power generation unit due to acquisition errors, errors may occur in the adjustment target power of the active power of the photovoltaic power station due to transmission or determination, the weight coefficient of each power generation unit in the photovoltaic power station is determined according to the similar daily power of each power generation unit in the photovoltaic power station on historical similar days, and errors may occur in the actual adjustment power obtained by calculation due to various factors, such as errors in the determination on historical similar days, errors in the determination of the similar daily power, and errors in the weight coefficient.
Therefore, before calculating the actual regulated power for distributing the power to be distributed to each power generation unit and regulating the current active power of each power generation unit to the actual regulated power, it is further required to determine whether the actual regulated power exceeds the currently adjustable theoretical upper limit power, i.e., the maximum active power, of each power generation unit. If the actual regulation power exceeds the currently adjustable maximum active power of each power generation unit, and the current active power of each power generation unit is adjusted to the actual regulation power under the condition, each power generation unit needs to be maintained under the operation condition of the maximum power generation power for a long time, and the problem that the power generation unit is irreversibly damaged or cannot be expected is possibly caused. Further, the current active power of each power generation unit also needs to be determined to be not greater than the corresponding maximum active power. Through the arrangement, the power generation unit in the photovoltaic power station is prevented from being in an abnormal overload operation state due to various possible reasons, and the safe operation of the power generation unit is ensured.
Optionally, the step of determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station includes:
and determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station according to the current active power of the preset full power generation unit and the weight coefficient of each power generation unit.
In the embodiment, a method for determining the current adjustable maximum active power of each power generation unit in a photovoltaic power station is provided, the current adjustable maximum active power of each power generation unit in the photovoltaic power station is determined by presetting the current active power of full power generation units and the weight coefficient of each power generation unit,
Pmax i ＝P 1 *K i ，i∈[2，N]
wherein Pmax i For the currently adjustable maximum active power, P, of each power generation unit in the photovoltaic power station 1 For presetting the actual regulated power, K, of the full-firing unit i The weight coefficient of each power generation unit in the photovoltaic power station.
Therefore, under the most extreme condition, even if the actual regulating power and the weight coefficient of the full power generating unit are preset to be wrong, the power generating unit in the photovoltaic power station can be prevented from being in an abnormal overload operation state due to the fact that the regulating target power of the active power of the photovoltaic power station is wrong, and therefore safe operation of the power generating unit is guaranteed.
Referring to fig. 3, fig. 3 is a schematic application diagram of an embodiment of an active power adjusting method for a photovoltaic power station according to the present invention. In the present embodiment, the main contents include:
step1: obtaining an AGC active power instruction target value P (an adjusting target power of the active power of the photovoltaic power station);
step2: judging whether the command is a lifting command (a command for lifting the active power of the photovoltaic power station), if not, carrying out an average distribution strategy, and if the command is a lifting command, entering Step3;
step3: searching out historical similar days according to the data of the current electrical parameters and the current environmental parameters in the current adjusting scene;
step4: taking a preset full power generation unit as a reference, converting to obtain a weight coefficient K of each power generation unit in a historical similar day i ；
Step5: according to the current active power P of the preset full power generation unit 1 And a weight coefficient K of each power generation unit i Solving the maximum active power Pmax of each power generation unit which can be adjusted currently at the current moment i ；
Step6: according to the command target value (adjusting target power) P and the actual adjusting power P of the preset full sending unit 1 Weight coefficient K i Calculating the power distribution value (actual regulated power of each power generation unit) P of each power generation unit i And ensuring that the actual regulating power of each power generation unit is not more than the corresponding maximum active power Pmax i 。
In order to verify the rationality of the non-average distribution strategy in the power increase in the embodiment, a certain photovoltaic power station is taken as an example for measurement and calculation, and the power generation loss reduced in comparison with the average distribution scheme is solved. The power generation unit of 8 total photovoltaic power plants sends a power rise instruction at a certain time, and the instruction target value (adjustment target power) P =575kW.
Referring to fig. 4 to 7, the power generation unit 1 and the power generation unit 2 will be described as an example. The current power of the power generation unit 1 is 39.23 (unit neglected), the similar daily power is 36.86, the current power of the power generation unit 2 is 69.46, and the similar daily power is 66.38, so that the conversion coefficient of the power generation unit 2 is determined to be 66.38 ÷ 36.86 ≈ 1.8, and the current active power of the power generation unit 2 is determined to be 39.23 × 1.8 ≈ 70.61, and based on the formulas of the distribution method of power to be distributed and the actual regulation power determination method proposed in the above embodiments, the power distribution value of the power generation unit 2 is calculated to be 69.78 < 70.61, so that the power distribution value 69.78 is taken as the actual regulation power of the power generation unit 2, and the current active power of the power generation unit 2 is regulated from 69.46 to 69.78. In fig. 7, the horizontal axis represents the adjustment times, the vertical axis represents the adjustment target power P, the current adjustment target power P is 575 represented by a thick straight line, a triple-fold line located at the lower right represents the power climbing state under the average distribution strategy, and a thin straight line located at the upper left represents the power climbing state under the non-average distribution strategy in this embodiment, as can be known from fig. 7, compared with the conventional average distribution method, the method for rapidly adjusting the active power of the photovoltaic power station based on the power generation capability of the power generation unit can reach the target value P by one-time tracking, and the average distribution strategy can reach the target value P by three-cycle tracking adjustment. Therefore, the embodiment can realize faster tracking, remarkably reduce the power generation loss caused by the average distribution strategy when the strategy needs to be adjusted for multiple times, and particularly has a remarkable effect of reducing the loss when the power generation capacity difference of each power generation unit is large.
In addition, referring to fig. 8, an embodiment of the present invention further provides a photovoltaic power station active power adjusting device, where the photovoltaic power station active power adjusting device includes:
the weight coefficient determining module M1 is used for determining the weight coefficient of each power generation unit in the photovoltaic power station;
the power to be distributed determining module M2 is used for determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of the preset full power generating unit;
and the actual adjusting power determining module M3 is used for determining the actual adjusting power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and adjusting the current active power of each power generation unit to the actual adjusting power.
Optionally, the weight coefficient determining module is further configured to determine a current adjustment scenario corresponding to the adjustment target power, and determine a historical similar day similar to the current adjustment scenario;
and determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station.
Optionally, the weight coefficient determining module is further configured to obtain a current electrical parameter and a current environmental parameter in the current adjustment scenario;
and determining a historical similar day similar to the current adjusting scene according to the current electrical parameters and the current environment parameters.
Optionally, the weight coefficient determining module is further configured to determine, with the similar daily power of the preset full power generation unit as a reference, a power ratio between the similar daily power of the preset full power generation unit and similar daily powers of the other power generation units in the photovoltaic power station except the preset full power generation unit, and use the power ratio as the weight coefficient of the other power generation units except the preset full power generation unit;
wherein the weight coefficient of the preset full sending unit is 1.
Optionally, the actual adjustment power determining module is further configured to determine, if the power generation unit is a preset full power generation unit, that the actual adjustment power of the preset full power generation unit is the current active power of the preset full power generation unit.
Optionally, the actual adjustment power determining module is further configured to determine, if the power generation unit is a non-preset full emission unit, a weight ratio between a weight coefficient of the non-preset full emission unit and a weight coefficient sum of all non-preset full emission units, and determine the actual adjustment power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight ratio corresponding to each power generation unit.
Optionally, the actual adjustment power determining module is further configured to determine a current adjustable maximum active power of each power generation unit in the photovoltaic power station;
and if the actual regulating power of each power generation unit is not greater than the corresponding maximum active power, executing the step of regulating the current active power of each power generation unit to the actual regulating power.
Optionally, the actual adjustment power determining module is further configured to determine, according to the current active power of the preset full power generation unit and the weight coefficient of each power generation unit, the current adjustable maximum active power of each power generation unit in the photovoltaic power station.
Optionally, the photovoltaic power station active power adjusting apparatus further includes an instruction judging module, configured to execute the step of determining the weight coefficient of each power generation unit in the photovoltaic power station if a power adjustment instruction corresponding to the adjustment target power of the photovoltaic power station active power is an instruction for lifting the photovoltaic power station active power.
According to the active power adjusting device for the photovoltaic power station, the active power adjusting method for the photovoltaic power station in the embodiment is adopted, and the technical problem that the generated power of each power generation unit in the photovoltaic power station is difficult to accurately and quickly distribute when the generated power of the photovoltaic power station is adjusted in the prior art is solved. Compared with the prior art, the beneficial effects of the photovoltaic power station active power regulating device provided by the embodiment of the invention are the same as the beneficial effects of the photovoltaic power station active power regulating method provided by the embodiment, and other technical characteristics of the photovoltaic power station active power regulating device are the same as the characteristics disclosed by the embodiment method, which are not repeated herein.
In addition, an embodiment of the present invention further provides a photovoltaic power station active power adjusting device, where the photovoltaic power station active power adjusting device includes: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the photovoltaic power plant active power regulation method as described above.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the photovoltaic power plant active power regulation method described above are implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A photovoltaic power station active power adjusting method is characterized by comprising the following steps:
determining the weight coefficient of each power generation unit in the photovoltaic power station;
determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of a preset full power generation unit;
and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and regulating the current active power of each power generation unit to the actual regulating power.
2. The photovoltaic power plant active power regulation method of claim 1, wherein the step of determining the weight coefficients for each power generation unit within the photovoltaic power plant comprises:
determining a current adjusting scene corresponding to the adjusting target power, and determining a historical similar day similar to the current adjusting scene;
and determining the weight coefficient of each power generation unit in the photovoltaic power station according to the similar daily power of each power generation unit in the historical similar daily photovoltaic power station.
3. The photovoltaic power plant active power regulation method of claim 2, wherein the step of determining historical similar days similar to the current regulation scenario comprises:
acquiring current electrical parameters and current environmental parameters under the current adjusting scene;
and determining a historical similar day similar to the current adjusting scene according to the current electrical parameters and the current environment parameters.
4. The method for regulating active power of a photovoltaic power plant according to claim 2, wherein the step of determining the weight coefficient of each power generation unit in the photovoltaic power plant according to the similar daily power of each power generation unit in the historical similar-daily photovoltaic power plant comprises:
determining the power ratio between the similar daily power of the preset full-emission unit and the similar daily power of all the other power generation units except the preset full-emission unit in the photovoltaic power station by taking the similar daily power of the preset full-emission unit as a reference, and taking the power ratio as the weight coefficient of all the other power generation units except the preset full-emission unit;
wherein the weight coefficient of the preset full sending unit is 1.
5. The method for regulating active power of a photovoltaic power plant according to claim 1, wherein the step of determining the actual regulated power of each power generation unit in the photovoltaic power plant according to the power to be distributed and the weight coefficient comprises:
and if the power generation unit is a preset full power generation unit, determining the actual regulating power of the preset full power generation unit as the current active power of the preset full power generation unit.
6. The method for regulating active power of a photovoltaic power plant according to claim 1, wherein the step of determining the actual regulated power of each power generation unit in the photovoltaic power plant according to the power to be distributed and the weight coefficient comprises:
and if the power generation units are non-preset full-emission units, determining the weight ratio between the weight coefficient of the non-preset full-emission units and the weight coefficient sum of all the non-preset full-emission units, and determining the actual regulating power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight ratio corresponding to each power generation unit.
7. The photovoltaic power plant real power regulation method of claim 1 wherein the step of regulating the current real power of each power generation unit to the actual regulated power is preceded by the step of:
determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station;
and if the actual regulating power of each power generation unit is not greater than the corresponding maximum active power, executing the step of regulating the current active power of each power generation unit to the actual regulating power.
8. The photovoltaic power plant active power regulation method of claim 7, wherein the step of determining the maximum active power currently adjustable for each power generation unit within the photovoltaic power plant comprises:
and determining the current adjustable maximum active power of each power generation unit in the photovoltaic power station according to the current active power of the preset full power generation unit and the weight coefficient of each power generation unit.
9. The photovoltaic power plant active power regulation method of claim 1, wherein the step of determining the weight coefficients of the power generation units within the photovoltaic power plant is preceded by the step of:
and if the power adjusting instruction corresponding to the adjusting target power of the active power of the photovoltaic power station is an instruction for lifting the active power of the photovoltaic power station, executing the step of determining the weight coefficient of each power generation unit in the photovoltaic power station.
10. A photovoltaic power plant active power adjusting device, characterized in that, photovoltaic power plant active power adjusting device includes:
the weight coefficient determining module is used for determining the weight coefficient of each power generation unit in the photovoltaic power station;
the power to be distributed determining module is used for determining power to be distributed according to the adjusting target power of the active power of the photovoltaic power station and the current active power of the preset full power generating unit;
and the actual adjusting power determining module is used for determining the actual adjusting power of each power generation unit in the photovoltaic power station according to the power to be distributed and the weight coefficient, and adjusting the current active power of each power generation unit to the actual adjusting power.
11. A photovoltaic power plant active power regulating apparatus, characterized in that the photovoltaic power plant active power regulating apparatus includes: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the photovoltaic power plant active power regulation method of any one of claims 1 to 9.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the photovoltaic power plant active power regulation method according to any one of claims 1 to 9.
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