CN115241934A - Active power control method and device for photovoltaic power station - Google Patents
Active power control method and device for photovoltaic power station Download PDFInfo
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- CN115241934A CN115241934A CN202210854016.3A CN202210854016A CN115241934A CN 115241934 A CN115241934 A CN 115241934A CN 202210854016 A CN202210854016 A CN 202210854016A CN 115241934 A CN115241934 A CN 115241934A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a method and a device for controlling active power of a photovoltaic power station, wherein the method comprises the following steps: comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result; determining a response mode of the inverter according to the comparison result; and sending the response mode of the inverter to the inverter. The device is used for executing the method. According to the method and the device for controlling the active power of the photovoltaic power station, the inverter is set to adopt different response modes according to different automatic power generation control instructions, so that different performance requirements of the transformer at different stages are met, and the power generation efficiency of the photovoltaic power station is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power station control, in particular to a method and a device for controlling active power of a photovoltaic power station.
Background
The photovoltaic power generation has randomness and volatility, and with the gradual increase of photovoltaic permeability in a power grid, the safe and stable operation of the power grid can be influenced by large-scale photovoltaic power station grid connection, and particularly, the power grid is greatly impacted by the short-time and large-amplitude fluctuation of photovoltaic power. In order to solve the problems, the current standard makes a strict regulation on the active power response performance of the photovoltaic power station, the active power change rate of the photovoltaic power station is not more than 10% in installed capacity/min in the normal starting and free power generation stages of the photovoltaic power station, and the situation that the active power change rate of the photovoltaic power station exceeds the limit value due to the reduction of solar irradiance is allowed to occur; when the photovoltaic power station responds to power grid dispatching, the maximum deviation allowed by the control of the active power set value of the photovoltaic power station is not more than 5% of the installed capacity of the photovoltaic power station, and the control response time of the active power of the photovoltaic power station is not more than 60s.
In the prior art, the control of the active power of the power station is mainly realized by manually adjusting a power control period, a power dead zone and a control step length so as to achieve that the change rate of the active power of the power station reaches a certain given value. The active power control method can only complete a certain fixed active power change rate, and cannot simultaneously meet the performance requirements of the photovoltaic power station in the normal startup, the power generation stage and the response power grid dispatching stage.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiments of the present invention provide a method and an apparatus for controlling active power of a photovoltaic power station, which can at least partially solve the problems in the prior art.
On one hand, the invention provides a photovoltaic power station active power control method, which comprises the following steps:
comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
determining a response mode of the inverter according to the comparison result;
transmitting the response pattern of the inverter to the inverter.
Further, the determining the response mode of the inverter according to the comparison result includes:
if the active power instruction issued by the automatic power generation control substation is different from the previous active power instruction, the response mode of the inverter is obtained as a first response mode;
and if the active power instruction issued by the automatic power generation control substation is judged to be the same as the previous active power instruction, the response mode of the inverter is obtained as a second response mode.
Further, the first response mode includes:
setting a given value of an inner loop current of the inverter as a first current regulation value within a preset time; if the first current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current. .
Further, the preset time is greater than or equal to 30 seconds and less than or equal to 60 seconds.
Further, the second response mode signal includes:
increasing the given value of the inner loop current of the inverter to a second current regulation value in a step or linear mode; if the second current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current;
and increasing the rate of the active power value corresponding to the given value of the inner loop current of the inverter to the active power value corresponding to the second current modulation value in a step or linear mode, wherein the rate is smaller than or equal to a preset threshold value.
On the other hand, the invention provides a photovoltaic power station active power control device, which comprises:
the data comparison module is used for comparing the received current active power instruction sent by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
the judging module is used for determining the response mode of the inverter according to the comparison result;
and the signal sending module is used for sending the response mode of the inverter to the inverter.
And further. The determining a response mode of the inverter according to the comparison result includes:
if the active power instruction issued by the automatic power generation control substation is different from the previous active power instruction, the response mode of the inverter is obtained as a first response mode;
and if the active power instruction issued by the automatic power generation control substation is judged to be the same as the previous active power instruction, the response mode of the inverter is obtained as a first response mode.
Further, the first response mode signal includes:
setting a given value of an inner ring current of the inverter as a first current regulation value within a preset time; if the first current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current.
Further, the preset time is greater than or equal to 30 seconds and less than or equal to 60 seconds.
Further, the second response mode signal includes:
increasing the inverter inner loop current set value to a second current regulation value in a step or linear mode; if the second current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner ring current of the inverter as the maximum power point tracking current;
and increasing the rate of the active power value corresponding to the given value of the inner loop current of the inverter to the active power value corresponding to the second current modulation value in a step or linear mode, wherein the rate is smaller than or equal to a preset threshold value.
In another aspect, the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the photovoltaic power station active power control method according to any one of the above embodiments.
In yet another aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for active power control of a photovoltaic power plant according to any one of the above embodiments.
The embodiment of the invention provides a photovoltaic power station active power control method and device, wherein the method comprises the following steps: comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result; determining a response mode of the inverter according to the comparison result; transmitting the response pattern of the inverter to the inverter. According to different automatic power generation control instructions, the inverter is set to adopt different response modes, so that different performance requirements of the transformer at different stages are met, and the power generation efficiency of the photovoltaic power station is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of a photovoltaic power plant active power control method according to an embodiment of the present invention.
Fig. 2 is a logic diagram for determining an inverter response mode according to an embodiment of the present invention.
Fig. 3a is a graph showing a variation of a given value of the inner loop current in the first response mode according to an embodiment of the present invention.
Fig. 3b is a graph showing a variation of a given value of the inner loop current in the first response mode according to an embodiment of the present invention.
Fig. 4a is a graph showing a variation of a given value of the inner loop current in the second response mode according to an embodiment of the present invention.
Fig. 4b is a graph showing a variation of a given value of the inner loop current in the second response mode according to an embodiment of the present invention.
Fig. 5a is a graph showing a variation of a given value of the inner loop current in the second response mode according to an embodiment of the present invention.
Fig. 5b is a graph showing a variation of a given value of the inner loop current in the second response mode according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an active power control apparatus of a photovoltaic power plant according to an embodiment of the present invention.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The execution subject of the automatic determining method of the hyperparameter provided by the embodiment of the invention comprises but is not limited to a computer, a server and an industrial personal computer.
Fig. 1 is a schematic flow chart of a photovoltaic power station active power control method according to an embodiment of the present invention, and as shown in fig. 1, the photovoltaic power station active power control method according to the embodiment of the present invention includes:
s101: comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
in this step, the active power instruction issued last time by the automatic power generation control substation and the active power instruction issued currently are compared, and a comparison result is obtained.
Specifically, a self-generating control substation of the photovoltaic power station issues an automatic power generation control instruction to a photovoltaic inverter of the photovoltaic power station, and the content of the automatic power generation control instruction is to adjust the active power of the photovoltaic power station, namely the active power instruction.
Specifically, the active power instruction is adjusted in real time according to the operation mode of the photovoltaic power station.
Specifically, the operation mode of the photovoltaic power station mainly comprises a power grid dispatching mode and a free power generation mode.
The power grid dispatching mode requires that the active power of the station only changes rapidly to reach the active power value required in the free power generation control instruction, so that the free power generation control instruction of the free power generation control main station is responded. The reasons for triggering the photovoltaic power station to enter the power grid dispatching mode include the following two reasons:
one is that power imbalance occurs in the power grid system, and the photovoltaic power station is required to increase or decrease active power so as to balance the power of the power grid system;
one is that the frequency of the power grid is out of limit, according to the regulation of GB/T19964, the normal range of the frequency of the power grid is 19.5Hz-50.2Hz, and when the frequency of the power grid is out of limit, the power station automatically generates frequency modulation power.
Specifically, when the new energy station is judged to be in the power grid dispatching mode, the new energy station is considered to be in the power grid dispatching mode within a time period, and after the time period, the new energy station is defaulted to finish power grid dispatching.
For example, NB/T32026-2015 "method for testing and evaluating grid-connected performance of photovoltaic power stations" specifies that the maximum deviation allowed by control of the active power set value of a photovoltaic power station does not exceed 5% of the installed capacity of the photovoltaic power station, and the active power control response time of the photovoltaic power station does not exceed 60s, so that the time period is generally set to 60s, and when the operation mode of a new energy station is the power grid scheduling mode for 60s, the new energy station is defaulted to complete power grid scheduling.
The free power generation mode is to generate power as much as possible according to the actual operation environment of the photovoltaic power station on the premise of ensuring that the power generation amount of the photovoltaic power station reaches the active power instruction.
For example, when the lighting condition in the operating environment of the photovoltaic power station is good, the photovoltaic power station has a high maximum power point tracking current, and the power generation capacity of the photovoltaic power station is good at this time. And when the photovoltaic power station reaches the active power required by the active power instruction issued by the automatic power generation control substation, generating as much as possible according to the illumination condition.
Specifically, when the photovoltaic power station is about to enter a power grid dispatching mode, the automatic power generation control sub-station can issue a new active power instruction different from the previous active power instruction, so that power grid dispatching of the photovoltaic power station is realized.
Specifically, when the photovoltaic power station is always in the free power generation mode, the active power commands issued by the automatic power generation control substation within the preset interval are the same, and the photovoltaic power station can generate power as much as possible according to the illumination condition after the active power value of the current active power command is reached.
Specifically, whether the active power of two times has a deviation is judged according to the comparison between the received active power command issued by the latest automatic power generation control substation and the active power command issued last time, and the comparison result is that the received active power command issued by the latest automatic power generation control substation and the active power command issued last time have a deviation or the received active power command issued by the latest automatic power generation control substation and the active power command issued last time do not have a deviation.
S102: determining a response mode of the inverter according to the comparison result;
in this step, the response mode of the inverter is determined according to the comparison result between the active power command issued latest by the automatic power generation control substation acquired in step S101 and the active power command issued last time.
Specifically, the response mode of the inverter corresponds to the comparison result of the active power command issued latest by the automatic power generation control substation acquired in S101 and the active power command issued last time one by one.
Specifically, the comparison results are divided into two types;
one mode is that a deviation exists between a received active power instruction issued by the latest automatic power generation control substation and an active power instruction issued last time, at the moment, the photovoltaic power station is going to enter a power grid dispatching mode, a response mode correspondingly adopted by a photovoltaic power station inverter is a first response mode, and the first response mode can quickly adjust the active power of the photovoltaic power station, so that the photovoltaic power station can complete the response to the power grid dispatching instruction in the shortest time.
And the other is that no deviation exists between the received active power instruction issued by the latest automatic power generation control substation and the active power instruction issued last time. At the moment, the photovoltaic power station is in a free power generation mode, a response mode correspondingly adopted by the photovoltaic power station inverter is a second response mode, the second response mode gradually adjusts the active power of the photovoltaic power station in a slope or step mode, and power is generated as much as possible on the premise that the power generation of the photovoltaic power station is qualified and the active power change rate does not cross the line according to the illumination condition of the photovoltaic power station.
In the free power generation mode, the adjustment of the active power of the photovoltaic power station is limited by GB/T19964-2012' technical Specification for connecting the photovoltaic power station to the power system, the active power change rate of the photovoltaic power station is not more than 10%/min of installed capacity, and the situation that the active power change rate of the photovoltaic power station exceeds the limit value due to the reduction of solar irradiance is allowed to occur.
S103: transmitting the response pattern of the inverter to the inverter.
In this step, according to the inverter response mode determined in step S102, the corresponding response mode is issued to the photovoltaic inverter of the photovoltaic power station.
Specifically, according to the inverter response mode determined in step S102, the corresponding response mode is issued to the photovoltaic inverter of the photovoltaic power station, and the active power of the photovoltaic power station is adjusted according to the operation mode of the photovoltaic power station.
According to the active power control method of the photovoltaic power station, provided by the embodiment of the invention, the inverter is set to adopt different response modes according to different automatic power generation control instructions, so that different performance requirements of the transformer at different stages are met, and the power generation efficiency of the photovoltaic power station is improved.
Fig. 2 is a schematic logic diagram of determining a response mode of an inverter according to an embodiment of the present invention, as shown in fig. 2, and further, determining a response mode of an inverter according to the comparison result includes:
if the active power instruction issued by the automatic power generation control substation is different from the previous active power instruction, the response mode of the inverter is obtained as a first response mode;
and if the active power instruction issued by the automatic power generation control substation is judged to be the same as the previous active power instruction, the response mode of the inverter is obtained as a second response mode.
Specifically, the operation mode of the photovoltaic power station is judged according to whether the difference exists between the active power instruction newly issued by the automatic power generation control substation and the previous active power instruction, so that the response mode to be adopted by the photovoltaic inverter is determined.
The operation modes of the photovoltaic power station comprise a power grid dispatching mode and a free power generation mode; in a power grid dispatching mode, the photovoltaic inverter adopts a first response mode to quickly respond to active power change during power grid dispatching; under the free power generation mode, the photovoltaic inverter adopts a second response mode, and according to the illumination condition of the photovoltaic power station, under the premise that the power generation of the photovoltaic power station is qualified and the active power change rate does not cross the line, the active power of the photovoltaic inverter is gradually adjusted in a step or slope scheduling mode, so that the photovoltaic power station generates as much power as possible on the basis of reaching the active power required by the automatic power generation control instruction.
On the basis of the foregoing embodiments, further, the first response mode includes: setting a given value of an inner ring current of the inverter as a first current regulation value within a preset time; if the first current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current.
Specifically, when the photovoltaic inverter adopts the first response mode, the inner loop current of the photovoltaic inverter is set to be the first current modulation value within a preset time, so that the active power change in the power grid scheduling process is quickly responded.
Specifically, the first current value is obtained by calculating an active power value, and when an active power instruction received by the photovoltaic power station and issued by the automatic power generation control substation is different from a previous instruction, that is, a target active power of the photovoltaic power station changes, the current active power instruction is used for calculating the first current modulation value.
FIGS. 3a and 3b are graphs showing changes in the given value of the inner loop current in the first response mode, according to an embodiment of the present invention, as shown in FIGS. 3a and 3b, where I ddd1 Is a first current regulation value, I dmppt For maximum power point tracking current value, when the photovoltaic inverter adopts a first response mode, the inner loop current of the photovoltaic inverter is rapidly increased to a first current regulation value I ddd1 。
Wherein, as shown in FIG. 3a, when the first current modulation value I ddd1 The tracking current value I of the maximum power point of the photovoltaic inverter under the current illumination condition is smaller than dmppt When the voltage is higher than the first voltage, the inner loop current of the photovoltaic inverter is quickly increased to a first current regulation value I ddd1 。
Therein, as shown in FIG. 3b, when the first current modulation value I ddd1 The maximum power point tracking current value I of the photovoltaic inverter under the current illumination condition is larger than dmppt In time, due to the illumination condition, the maximum inner ring current value generated by the photovoltaic inverter cannot reach the first current modulation value I ddd1 At the moment, the current of the inner ring of the photovoltaic inverter is rapidly increased to the current maximum power point tracking current value I dmppt 。
On the basis of the above embodiments, further, the preset time is greater than or equal to 30 seconds and less than or equal to 60 seconds.
Specifically, the preset time is the time when the photovoltaic inverter adjusts the inner loop current value so as to complete response to power grid scheduling, after the preset time is over, the automatic power generation control substation defaults that the photovoltaic power station has completed power grid scheduling, and the first response mode of the photovoltaic inverter is over.
Specifically, NB/T32026-2015 & lt & ltmethod for testing and evaluating grid-connected performance of photovoltaic power stations & gt provides that the active power control response time of the photovoltaic power stations does not exceed 60s, namely the photovoltaic power stations should finish power grid scheduling within 60s.
For example, the preset time is set to be 60s, after the automatic power generation control substation issues the first response mode to all the photovoltaic inverters, the photovoltaic inverters rapidly adjust the active power so as to support power grid scheduling, after 60s, the photovoltaic inverters are defaulted to complete the active power adjustment required by the power grid scheduling, and the photovoltaic inverters exit the first response mode.
On the basis of the foregoing embodiments, further, the second response mode signal includes: increasing the given value of the inner loop current of the inverter to a second current regulation value in a step or linear mode; if the second current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current; the active power value corresponding to the given value of the inner loop current of the inverter is increased to the active power value corresponding to the second current modulation value in a stepped or linear manner at a rate less than or equal to a preset threshold, and the threshold is set according to actual needs, which is not limited in the embodiment of the invention.
Specifically, when the photovoltaic power station is in a free power generation state, the photovoltaic inverter adopts a second response mode, the given value of the inner ring current of the photovoltaic inverter is gradually increased to a second current modulation value, and the photovoltaic power station generates power as much as possible according to the illumination condition on the basis that the active power of the photovoltaic power station reaches the active power required by the automatic power generation control command.
Specifically, the second current value is obtained by calculating an active power value, and when an active power instruction received by the photovoltaic power station and issued by the automatic power generation control substation is the same as a previous instruction, that is, a target active power of the photovoltaic power station is not changed, the current active power instruction is used for calculating the second current modulation value.
FIGS. 4a and 4b are graphs showing changes in the given value of the inner loop current in the second response mode, according to an embodiment of the present invention, as shown in FIGS. 4a and 4b, where I ddd2 Is a first current regulation value, I dmppt For maximum power point tracking current value, when the photovoltaic inverter adopts a second response mode, the inner loop electric set value of the photovoltaic inverter is increased to a first current regulation value I in a slope increasing mode ddd2 。
Specifically, the slope may be defined according to a requirement, but an active power change caused by a change of a current set value in a slope increasing manner cannot exceed a preset threshold value
The active power change rate cannot exceed 10%/min of installed capacity according to the technical regulation of photovoltaic power station access power system of GB/T19964-2012.
Wherein, as shown in FIG. 4a, when the second current modulation value I ddd2 The tracking current value I of the maximum power point of the photovoltaic inverter under the current illumination condition is smaller than dmppt When the voltage is higher than the first voltage, the inner loop current of the photovoltaic inverter is gradually increased to a second current regulation value I in a slope increasing mode ddd1 。
Wherein, as shown in FIG. 4b, when the first current modulation value I ddd2 The maximum power point tracking current value I of the photovoltaic inverter under the current illumination condition is larger than dmppt In time, due to the illumination condition, the maximum inner ring current value generated by the photovoltaic inverter cannot reach the second current modulation value I ddd1 At the moment, the current of the inner ring of the photovoltaic inverter is gradually increased to the current maximum power point tracking current value I in a slope increasing mode dmppt 。
FIGS. 5a and 5b are graphs showing changes in the given value of the inner loop current in the second response mode, according to an embodiment of the present invention, as shown in FIGS. 5a and 5b, where I ddd2 Is a first current regulation value, I dmppt When the photovoltaic inverter adopts a second response mode, the inner ring electric set value of the photovoltaic inverter is increased to a first current regulation value I in a step increase mode for tracking the current value at the maximum power point ddd2 。
Specifically, the slope may be defined according to a requirement, but an active power change caused by a change of a current set value in a step increase manner cannot exceed a preset threshold value
The active power change rate cannot exceed 10%/min of installed capacity according to the technical regulation of photovoltaic power station access power system of GB/T19964-2012.
For example, the period of each power rise step is 6s, and in order not to exceed a threshold of 10%/min of the installed capacity, the step rise amplitude should not be greater than 1% of the installed capacity.
Wherein, as shown in FIG. 5a, when the second current modulation value I ddd2 The tracking current value I of the maximum power point of the photovoltaic inverter under the current illumination condition is smaller than dmppt When the voltage is higher than the first voltage, the inner loop current of the photovoltaic inverter is gradually increased to a second current regulation in a step increase modeValue of magnitude I ddd1 。
Wherein, as shown in FIG. 5b, when the second current modulation value I ddd2 The maximum power point tracking current value I of the photovoltaic inverter under the current illumination condition is larger than dmppt In time, due to the illumination condition, the maximum inner ring current value generated by the photovoltaic inverter cannot reach the second current modulation value I ddd2 At the moment, the current of the inner ring of the photovoltaic inverter is gradually increased to the current maximum power point tracking current value I in a step increase mode dmppt 。
Fig. 6 is a schematic structural diagram of an active power control device for a photovoltaic power station according to an embodiment of the present invention, and as shown in fig. 6, the active power control device for the photovoltaic power station according to the embodiment of the present invention includes: the data comparison module 601 is configured to compare the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result; the judging module 602 determines the response mode of the inverter according to the comparison result; a signal sending module 603, configured to send the response mode of the inverter to the inverter. Wherein:
the data comparison module 601 compares the active power instruction issued last time by the automatic power generation control substation with the currently issued active power instruction, and obtains a comparison result.
The determining module 602 determines a response mode of the inverter according to a comparison result between the active power command issued by the automatic power generation control substation latest and the active power command issued last time, which is acquired by the data comparing module 601.
The signal sending module 603 sends the corresponding response mode to the photovoltaic inverter of the photovoltaic power station according to the inverter response mode determined by the determining module 602.
According to the active power control device of the photovoltaic power station, provided by the embodiment of the invention, the inverter is set to adopt different response modes according to different automatic power generation control instructions, so that different performance requirements of the transformer at different stages are met, and the power generation efficiency of the photovoltaic power station is improved.
The embodiment of the active power control device for a photovoltaic power station provided by the embodiment of the present invention may be specifically configured to execute the processing flows of the above method embodiments, and the functions of the embodiment are not described herein again, and refer to the detailed description of the above method embodiments.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device may include: a processor (processor) 701, a communication Interface (Communications Interface) 702, a memory (memory) 703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 are in communication with each other via the communication bus 704. The processor 701 may call logic instructions in the memory 703 to perform the following method:
comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
determining a response mode of the inverter according to the comparison result;
transmitting the response pattern of the inverter to the inverter.
In addition, the logic instructions in the memory 703 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. 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 and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising:
comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
determining a response mode of the inverter according to the comparison result;
and sending the response mode of the inverter to the inverter.
The present embodiment provides a computer-readable storage medium, which stores a computer program, where the computer program causes the computer to execute the method provided by the foregoing method embodiments, for example, the method includes:
comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
determining a response mode of the inverter according to the comparison result;
transmitting the response pattern of the inverter to the inverter.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the specification, reference to the description of "one embodiment," a specific embodiment, "" some embodiments, "" e.g., "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A photovoltaic power station active power control method is characterized by comprising the following steps:
comparing the received current active power instruction issued by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
determining a response mode of the inverter according to the comparison result;
transmitting the response pattern of the inverter to the inverter.
2. The photovoltaic power plant active power control method of claim 1, wherein the determining a response mode of the inverter based on the comparison comprises:
if the active power instruction issued by the automatic power generation control substation is different from the previous active power instruction, the response mode of the inverter is obtained as a first response mode;
and if the active power instruction issued by the automatic power generation control substation is judged to be the same as the previous active power instruction, the response mode of the inverter is obtained as a second response mode.
3. The photovoltaic power plant active power control method of claim 2, wherein the first response mode comprises:
setting a given value of an inner ring current of the inverter as a first current regulation value within a preset time; if the first current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current.
4. The photovoltaic power plant active power control method of claim 3, wherein the preset time is greater than or equal to 30 seconds and less than or equal to 60 seconds.
5. The photovoltaic power plant active power control method of claim 2, wherein the second response mode signal comprises:
increasing the given value of the inner loop current of the inverter to a second current regulation value in a step or linear mode; if the second current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current;
and increasing the rate of the active power value corresponding to the given value of the inner loop current of the inverter to the active power value corresponding to the second current modulation value in a step or linear mode to be less than or equal to a preset threshold value.
6. A photovoltaic power plant active power control apparatus, comprising:
the data comparison module is used for comparing the received current active power instruction sent by the automatic power generation control substation with the previous active power instruction to obtain a comparison result;
the judging module is used for determining the response mode of the inverter according to the comparison result;
and the signal sending module is used for sending the response mode of the inverter to the inverter.
7. The photovoltaic power plant active power control apparatus of claim 6, wherein the determining a response mode of the inverter based on the comparison comprises:
if the active power instruction issued by the automatic power generation control substation is different from the previous active power instruction, the response mode of the inverter is obtained as a first response mode;
and if the active power instruction issued by the automatic power generation control substation is judged to be the same as the previous active power instruction, the response mode of the inverter is obtained as a first response mode.
8. The photovoltaic power plant active power control apparatus of claim 7, wherein the first response mode signal comprises:
setting a given value of an inner loop current of the inverter as a first current regulation value within a preset time; if the first current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current.
9. The photovoltaic power plant active power control apparatus of claim 8, wherein the preset time is 30 seconds or more and 60 seconds or less.
10. The photovoltaic power plant active power control apparatus of claim 7, wherein the second response mode signal comprises:
increasing the inverter inner loop current set value to a second current regulation value in a step or linear mode; if the second current scheduling value is larger than the maximum power point tracking current of the inverter, setting the given value of the inner loop current of the inverter as the maximum power point tracking current;
and increasing the rate of the active power value corresponding to the given value of the inner loop current of the inverter to the active power value corresponding to the second current modulation value in a step or linear mode, wherein the rate is smaller than or equal to a preset threshold value.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 5 are implemented when the computer program is executed by the processor.
12. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN202210854016.3A CN115241934A (en) | 2022-07-07 | 2022-07-07 | Active power control method and device for photovoltaic power station |
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| CN202210854016.3A CN115241934A (en) | 2022-07-07 | 2022-07-07 | Active power control method and device for photovoltaic power station |
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