CN117526389A - Output power adjusting method of energy storage inverter and computer equipment - Google Patents
Output power adjusting method of energy storage inverter and computer equipment Download PDFInfo
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- CN117526389A CN117526389A CN202410021015.XA CN202410021015A CN117526389A CN 117526389 A CN117526389 A CN 117526389A CN 202410021015 A CN202410021015 A CN 202410021015A CN 117526389 A CN117526389 A CN 117526389A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000013441 quality evaluation Methods 0.000 claims description 28
- 238000012216 screening Methods 0.000 claims description 11
- 238000003908 quality control method Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 4
- 230000004044 response Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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Classifications
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides an output power adjusting method and computer equipment of an energy storage inverter, which belong to the technical field of energy storage devices and specifically comprise the following steps: the reliability of the bus box and the reliability of the problem bus box are utilized to determine, output current waveforms of inverters connected with different problem bus boxes are obtained, the output reliability of different inverters and the determination of the problem inverters are performed based on the similarity of the output current waveforms of the inverters and preset current waveforms, and the reliability of the use of the energy storage device is also ensured on the basis of reducing harmonic content according to the output power of the energy storage device, the reliability of the bus box and the similarity of the output current waveforms, the output reliability of the inverters and the similarity of the output current waveforms.
Description
Technical Field
The invention belongs to the technical field of energy storage devices, and particularly relates to an output power adjusting method of an energy storage inverter and computer equipment.
Background
The energy storage inverter is used as an intermediate electric energy conversion link for connecting an energy storage battery and a power grid, the operation safety and reliability of the energy storage inverter are critical to the operation reliability of an energy storage device, meanwhile, the number of inverters required to be managed by the energy storage device is greatly increased due to the large-scale application of the serial inverters, and the output current waveforms among different inverters cannot be completely consistent, so that the problem of how to realize the adjustment of the output power of the inverters is solved, and the harmonic content of grid-connected current generated by the energy storage device due to inconsistent current of the inverters is effectively controlled.
In order to solve the above technical problems, in the prior art, the improvement of the structure of the inverter or the driving signal of the power electronic component is often used to control the harmonic content, and in the invention patent CN111668849a, a line voltage compensation system based on an energy storage module and power supply of the inverter, CN210724597U, a novel multi-level inverter for reducing loss, the effective control of the harmonic content is realized by the improvement of an additional compensation device or a circuit topology structure, but the following technical problems exist:
the adoption of the additional compensation device can cause the increase of the cost of the energy storage device, and the improvement of the circuit topology structure can not fundamentally eliminate the difference of current waveforms among different series-connected inverters, so that the grid-connected harmonic content of the energy storage device can not be effectively controlled.
The invention provides an output power adjusting method of an energy storage inverter and computer equipment aiming at the technical problems.
Disclosure of Invention
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
according to one aspect of the present invention, a temperature measurement method for use in a high pressure environment is provided.
The output power adjusting method of the energy storage inverter is characterized by comprising the following steps of:
s1, acquiring harmonic contents of different output currents of an energy storage device in different output power intervals, determining an electric energy quality evaluation value of the energy storage device based on the harmonic contents of the different output currents in the different output power intervals, and entering a next step when the electric energy quality evaluation value of the energy storage device does not meet the requirements;
s2, determining the use reliability of different junction boxes according to the similarity between the output current waveforms of the energy storage device and the preset current waveforms in different output power intervals, and determining the reliable junction boxes and the problem junction boxes in the junction boxes according to the use reliability;
s3, obtaining output current waveforms of inverters connected with different problem junction boxes, and determining output reliability of different inverters and problem inverters based on similarity of the output current waveforms of the inverters and the preset current waveforms;
and S4, determining the output power of the energy storage device according to the energy storage regulation requirement of the energy storage device, and determining the output power of different junction boxes and inverters according to the output power of the energy storage device, the use reliability of the reliable junction boxes and the similarity of output current waveforms among the reliable junction boxes, the output reliability of the inverters and the similarity of output current waveforms among the inverters.
The invention has the beneficial effects that:
1. the method comprises the steps of determining the power quality evaluation value of the energy storage device based on the harmonic content of different output currents in different output power intervals, and firstly determining the power quality by determining the harmonic content of the output currents of the energy storage device in different output power intervals, so that the screening of the energy storage device with the power quality not meeting the requirement is realized, and a foundation is laid for targeted adjustment of the power quality of the energy storage device.
2. The reliability of the use is utilized to determine the reliable junction box and the problem junction box in the junction box, so that the problem junction box and the use reliability are evaluated from the angle of the similarity of the output current waveforms, and a foundation is laid for further targeted evaluation and excavation of the problem inverter.
3. The output reliability of different inverters and the determination of the problem inverter are carried out based on the similarity of the output current waveform of the inverter and the preset current waveform, so that the technical problem of low electric energy quality caused by the participation of the problem inverter in the adjustment of the output power is avoided, and meanwhile, a foundation is laid for the differentiated dynamic adjustment of the output power of the inverter.
4. The reliability of the use of the reliable combiner box, the similarity of the output current waveform, the output reliability of the inverter and the similarity of the output current waveform are used for determining the output power of different combiner boxes and the output power of the inverter, the difference of the reliability of the different combiner boxes and the inverter caused by the problem of the output current waveform is considered, meanwhile, the similarity evaluation is carried out between the output current waveform of the inverter and the output current waveform of the reliable combiner box, and the electric energy quality of the output of the energy storage device is effectively controlled on the basis of guaranteeing the reliability of energy storage adjustment.
The further technical scheme is that the harmonic content of the output current of the energy storage device in different output power intervals is determined according to the analysis result of the current waveform of the output current of the energy storage device when the history responds to the energy storage regulation requirement.
The further technical scheme is that the preset current waveform is determined according to the current waveform of the power transmission line connected with the energy storage device.
The further technical scheme is that the method for determining the output reliability comprises the following steps:
and determining the historical operation time length of the inverter in different similarity intervals according to the similarity between the output current waveform of the inverter and the preset current waveform, and determining the output reliability of the inverter according to the historical operation time length of the inverter in different similarity intervals.
In a second aspect, the present invention provides a computer device comprising: a communicatively coupled memory and processor, and a computer program stored on the memory and capable of running on the processor, characterized by: the processor executes the output power adjusting method of the energy storage inverter when running the computer program.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings;
FIG. 1 is a flow chart of a temperature measurement method for use in a high pressure environment;
FIG. 2 is a flow chart of a method of determining a power quality assessment value for an energy storage device;
FIG. 3 is a flow chart of a method of determining reliability of use of a header tank;
fig. 4 is a frame diagram of a computer device.
Detailed Description
In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present disclosure.
Because of the waveform difference between the different string inverters of the energy storage device, the electric energy quality of the output current waveform of the energy storage device is difficult to effectively control, so that how to effectively control the electric energy quality of the energy storage device is a technical problem to be solved.
In order to solve the technical problems, the following technical scheme is mainly adopted:
firstly, acquiring harmonic contents of different output currents of an energy storage device in different output power intervals, determining an electric energy quality evaluation value of the energy storage device based on the harmonic contents of the different output currents of the different output power intervals, specifically, determining electric energy quality of the different output power intervals by means of harmonic content average values of the output currents of the different output power intervals, finally, determining the electric energy quality evaluation value of the energy storage device according to the electric energy quality of the different output power intervals, and entering the next step when the electric energy quality evaluation value does not meet the requirement;
then, determining the use reliability of different bus boxes according to the similarity of the output current waveforms of the energy storage device in different output power intervals and the preset current waveforms, specifically determining the use reliability of the bus boxes according to the ratio of the historical operation time length of the output power interval with abnormal similarity of the output current waveforms and the preset current waveforms, and determining the reliable bus boxes and the problem bus boxes in the bus boxes according to the use reliability;
then, screening problem inverters in the problem combiner boxes, determining output reliability of different inverters by using the similarity of output current waveforms of the inverters connected with the different problem combiner boxes and preset current waveforms, taking the inverter with the output reliability which does not meet the requirement as the problem inverter, determining the output current similarity of the different reliable combiner boxes and the inverter according to the similarity of the output current waveforms of the different reliable combiner boxes and the inverter, and determining the energy storage adjustment priority of the different inverters and the reliable combiner boxes based on the output current similarity;
and finally, determining whether the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box meet the requirements or not based on the output power of the energy storage device and the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box, and if so, determining the output power of different inverters and the combiner box according to the output reliability of the inverter with the specific energy storage adjustment priority and the use reliability of the reliable combiner box.
Further description will be made from two examples.
In order to solve the above-mentioned problems, according to one aspect of the present invention, as shown in fig. 1, there is provided a method for adjusting output power of an energy storage inverter, which is characterized by comprising:
s1, acquiring harmonic contents of different output currents of an energy storage device in different output power intervals, determining an electric energy quality evaluation value of the energy storage device based on the harmonic contents of the different output currents in the different output power intervals, and entering a next step when the electric energy quality evaluation value of the energy storage device does not meet the requirements;
specifically, the harmonic content of the output current of the energy storage device in different output power intervals is determined according to the analysis result of the current waveform of the output current of the energy storage device when the energy storage device responds to the energy storage regulation requirement historically.
As shown in fig. 2, the method for determining the power quality evaluation value of the energy storage device in the above step S1 includes:
determining the quantity of output currents with the harmonic content exceeding the preset harmonic content in different output power intervals according to the harmonic content of different output currents in different output power intervals, and determining the electric energy quality in different output power intervals by combining the harmonic content of different output currents;
judging whether an output power interval with the power quality not meeting the requirement exists, if so, determining that the power quality evaluation value of the energy storage device does not meet the requirement, and if not, entering the next step;
determining the adjustment times of the energy storage device in different output power intervals and the adjustment time length of the different adjustment times according to the historical operation data of the energy storage device, determining the adjustment frequency of the different output power intervals by combining the accumulated adjustment time length of the energy storage device in the different output power intervals, and determining the weight values of the different output power intervals based on the adjustment frequency;
correcting the electric energy quality of different output power intervals through the weight value of the output power interval to obtain corrected electric energy quality, judging whether the output power interval with the corrected electric energy quality not meeting the requirement exists, if so, determining that the electric energy quality evaluation value of the energy storage device does not meet the requirement, and if not, entering the next step;
and acquiring the corrected electric energy quality of the energy storage device in different output power intervals, and determining the electric energy quality evaluation value of the energy storage device by combining the number of the output power intervals, the corrected electric energy quality of which is smaller than a preset quality control amount, of the energy storage device and the deviation amount of the output power intervals, the corrected electric energy quality of which is smaller than the preset quality control amount, of the energy storage device and the preset quality control amount.
The method for determining the power quality of the output power interval includes:
determining the reference power quality of the output power interval through the average value of the harmonic contents of different output currents, and determining the power quality compensation quantity based on the quantity proportion of the output currents with the harmonic contents exceeding the preset harmonic contents in the output power interval;
and determining the power quality of the output power interval by utilizing the power quality compensation quantity and the reference power quality.
Further, the power quality evaluation value of the energy storage device ranges from 0 to 1, and when the power quality evaluation value of the energy storage device is smaller than the power quality control amount of the energy storage device, it is determined that the power quality evaluation value of the energy storage device does not meet the requirement.
When the power quality evaluation value of the energy storage device meets the requirement, the output power of the inverter is not required to be controlled, and the output power of different junction boxes is determined according to the energy storage regulation requirement of the energy storage device.
In another possible embodiment, the method for determining the power quality evaluation value of the energy storage device in the step S1 is as follows:
determining the adjustment times of the energy storage device in different output power intervals and the adjustment time length of the different adjustment times according to the historical operation data of the energy storage device, determining the adjustment frequency of different output power intervals by combining the accumulated adjustment time length of the energy storage device in different output power intervals, and determining the frequently used interval in the output power intervals through the adjustment frequency;
determining whether output currents with harmonic content exceeding preset harmonic content exist in the frequently-used intervals or not according to the harmonic content of different output currents in different output power intervals, if so, determining that the electric energy quality evaluation value of the energy storage device does not meet the requirement, and if not, entering the next step;
determining the quantity of output currents with the harmonic content exceeding the preset harmonic content in different output power intervals according to the harmonic content of different output currents in different output power intervals, determining the electric energy quality in different output power intervals by combining the harmonic content of different output currents, judging whether the output power intervals with the electric energy quality which does not meet the requirements exist, if so, determining that the electric energy quality evaluation value of the energy storage device does not meet the requirements, and if not, entering the next step;
and correcting the electric energy quality of different output power intervals through the weight value of the output power interval to obtain corrected electric energy quality, obtaining corrected electric energy quality of the energy storage device in different output power intervals, and determining the electric energy quality evaluation value of the energy storage device by combining the number of the output power intervals, the corrected electric energy quality of which is smaller than a preset quality control amount, of the energy storage device and the deviation amount of the corrected electric energy quality of which is smaller than the preset quality control amount, of the output power interval and the preset quality control amount.
S2, determining the use reliability of different junction boxes according to the similarity between the output current waveforms of the energy storage device and the preset current waveforms in different output power intervals, and determining the reliable junction boxes and the problem junction boxes in the junction boxes according to the use reliability;
specifically, as shown in fig. 3, the method for determining the reliability of use of the header box in the step S2 is as follows:
determining the similarity of the output current waveform and the preset current waveform through waveform characteristics of the output current waveform and the preset current waveform, dividing the output power interval into a specific output power interval and other output power intervals through historical operation data of the combiner box, judging whether the combiner box has output current with the similarity which does not meet the requirement in the specific output power interval, if so, determining the combiner box as a problem combiner box, and if not, entering the next step;
determining the current similarity of different output power intervals based on the similarity of the output current waveforms of different output currents in different output power intervals of the combiner box and preset current waveforms and the number of output currents with the similarity not meeting the requirement, judging whether the current similarity of the combiner box in the specific output power interval meets the requirement, if so, entering the next step, and if not, determining the combiner box as a problem combiner box;
determining screening current similarity of the combiner box according to current similarity of the combiner box in different specific output power intervals and historical operation time length proportion of the specific output power intervals, judging whether the screening current similarity of the combiner box meets requirements, if yes, entering the next step, and if no, determining the combiner box as a problem combiner box;
and acquiring historical operation time length of the combiner box and current similarity of different output power intervals, and determining the use reliability of the combiner box by combining the screening current similarity of the combiner box, the number of the output power intervals with the current similarity meeting the requirements and the historical operation time length ratio.
It can be appreciated that the preset current waveform is determined according to a current waveform of a power transmission line to which the energy storage device is connected.
Specifically, the method for determining the use reliability of the header box is as follows:
determining the similarity of the output current waveform and the preset current waveform through waveform characteristics of the output current waveform and the preset current waveform, and determining the current similarity of different output power intervals based on the similarity of the output current waveform of different output currents in different output power intervals of the combiner box and the preset current waveform and the number of output currents with the similarity not meeting the requirement;
when the number of output power intervals with the current similarity meeting the requirement of the combiner box is not met, determining the combiner box as a problem combiner box;
dividing the type of the output power section into a specific output power section and other output power sections according to the historical operation data of the bus box when the current similarity of the bus box meets the requirement and the number of the output power sections, determining the current similarity evaluation quantity of the bus box according to the type of the output power section and the number of the output power sections, of which the current similarity of the bus box does not meet the requirement, and determining the bus box as a problem bus box when the current similarity evaluation quantity of the bus box does not meet the requirement;
when the current similarity evaluation amount of the combiner box meets the requirement, determining the screening current similarity of the combiner box according to the current similarity of the combiner box in different specific output power intervals and the historical operation time length ratio of the specific output power intervals, acquiring the historical operation time length of the combiner box and the current similarity of different output power intervals, and determining the use reliability of the combiner box according to the screening current similarity of the combiner box, the number of the output power intervals with the current similarity meeting the requirement and the historical operation time length ratio.
S3, obtaining output current waveforms of inverters connected with different problem junction boxes, and determining output reliability of different inverters and problem inverters based on similarity of the output current waveforms of the inverters and the preset current waveforms;
further, the method for determining the output reliability comprises the following steps:
and determining the historical operation time length of the inverter in different similarity intervals according to the similarity between the output current waveform of the inverter and the preset current waveform, and determining the output reliability of the inverter according to the historical operation time length of the inverter in different similarity intervals.
And S4, determining the output power of the energy storage device according to the energy storage regulation requirement of the energy storage device, and determining the output power of different junction boxes and inverters according to the output power of the energy storage device, the use reliability of the reliable junction boxes and the similarity of output current waveforms among the reliable junction boxes, the output reliability of the inverters and the similarity of output current waveforms among the inverters.
The determination of the output power of the different junction boxes and inverters specifically includes:
determining the output current similarity of different reliable combiner boxes and inverters according to the similarity of the output current waveforms of the different reliable combiner boxes and the inverters, and determining the energy storage adjustment priority of the different inverters and the reliable combiner boxes based on the output current similarity;
determining whether the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box meet requirements or not based on the output power of the energy storage device and the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box, if so, determining the output power of different inverters and the combiner box according to the output reliability of the inverter with the specific energy storage adjustment priority and the use reliability of the reliable combiner box;
the output reliability of the inverters with the specific energy storage adjustment priorities and the use reliability of the reliable combiner box are used for determining the output power of the different inverters with the specific energy storage adjustment priorities and the combiner box, the output power deviation of the energy storage device is determined by combining the output power of the energy storage device, and the output reliability of the inverters with the other energy storage adjustment priorities and the use reliability of the reliable combiner box are determined according to the output power deviation of the energy storage device.
In another aspect, as shown in FIG. 4, the present invention provides a computer device comprising: a communicatively coupled memory and processor, and a computer program stored on the memory and capable of running on the processor, characterized by: the processor executes the output power adjusting method of the energy storage inverter when running the computer program.
Through the above embodiments, the present invention has the following beneficial effects:
1. the method comprises the steps of determining the power quality evaluation value of the energy storage device based on the harmonic content of different output currents in different output power intervals, and firstly determining the power quality by determining the harmonic content of the output currents of the energy storage device in different output power intervals, so that the screening of the energy storage device with the power quality not meeting the requirement is realized, and a foundation is laid for targeted adjustment of the power quality of the energy storage device.
2. The reliability of the use is utilized to determine the reliable junction box and the problem junction box in the junction box, so that the problem junction box and the use reliability are evaluated from the angle of the similarity of the output current waveforms, and a foundation is laid for further targeted evaluation and excavation of the problem inverter.
3. The output reliability of different inverters and the determination of the problem inverter are carried out based on the similarity of the output current waveform of the inverter and the preset current waveform, so that the technical problem of low electric energy quality caused by the participation of the problem inverter in the adjustment of the output power is avoided, and meanwhile, a foundation is laid for the differentiated dynamic adjustment of the output power of the inverter.
4. The reliability of the use of the reliable combiner box, the similarity of the output current waveform, the output reliability of the inverter and the similarity of the output current waveform are used for determining the output power of different combiner boxes and the output power of the inverter, the difference of the reliability of the different combiner boxes and the inverter caused by the problem of the output current waveform is considered, meanwhile, the similarity evaluation is carried out between the output current waveform of the inverter and the output current waveform of the reliable combiner box, and the electric energy quality of the output of the energy storage device is effectively controlled on the basis of guaranteeing the reliability of energy storage adjustment.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus, devices, non-volatile computer storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to the section of the method embodiments being relevant.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
The foregoing is merely one or more embodiments of the present description and is not intended to limit the present description. Various modifications and alterations to one or more embodiments of this description will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of one or more embodiments of the present description, is intended to be included within the scope of the claims of the present description.
Claims (10)
1. The output power adjusting method of the energy storage inverter is characterized by comprising the following steps of:
acquiring harmonic contents of different output currents of the energy storage device in different output power intervals, determining an electric energy quality evaluation value of the energy storage device based on the harmonic contents of the different output currents of the different output power intervals, and entering the next step when the electric energy quality evaluation value of the energy storage device does not meet the requirements;
determining the use reliability of different junction boxes according to the similarity between the output current waveforms of the energy storage devices in different output power intervals and preset current waveforms, and determining the reliable junction boxes and the problem junction boxes in the junction boxes according to the use reliability;
acquiring output current waveforms of inverters connected with different problem junction boxes, and determining output reliability of different inverters and problem inverters based on similarity of the output current waveforms of the inverters and the preset current waveforms;
and determining the output power of the energy storage device according to the energy storage regulation requirement of the energy storage device, and determining the output power of different combiner boxes and the output power of the inverter according to the output power of the energy storage device, the use reliability of the reliable combiner boxes and the similarity of output current waveforms among the reliable combiner boxes, the output reliability of the inverter and the similarity of output current waveforms among the inverters.
2. The method of claim 1, wherein harmonic content of the output current of the energy storage device at different output power intervals is determined based on analysis of current waveforms of the output current of the energy storage device at historical response to energy storage regulation demand.
3. The method for regulating the output power of an energy storage inverter according to claim 1, wherein the method for determining the power quality evaluation value of the energy storage device comprises:
determining the quantity of output currents with the harmonic content exceeding the preset harmonic content in different output power intervals according to the harmonic content of different output currents in different output power intervals, and determining the electric energy quality in different output power intervals by combining the harmonic content of different output currents;
judging whether an output power interval with the power quality not meeting the requirement exists, if so, determining that the power quality evaluation value of the energy storage device does not meet the requirement, and if not, entering the next step;
determining the adjustment times of the energy storage device in different output power intervals and the adjustment time length of the different adjustment times according to the historical operation data of the energy storage device, determining the adjustment frequency of the different output power intervals by combining the accumulated adjustment time length of the energy storage device in the different output power intervals, and determining the weight values of the different output power intervals based on the adjustment frequency;
correcting the electric energy quality of different output power intervals through the weight value of the output power interval to obtain corrected electric energy quality, judging whether the output power interval with the corrected electric energy quality not meeting the requirement exists, if so, determining that the electric energy quality evaluation value of the energy storage device does not meet the requirement, and if not, entering the next step;
and acquiring the corrected electric energy quality of the energy storage device in different output power intervals, and determining the electric energy quality evaluation value of the energy storage device by combining the number of the output power intervals, the corrected electric energy quality of which is smaller than a preset quality control amount, of the energy storage device and the deviation amount of the output power intervals, the corrected electric energy quality of which is smaller than the preset quality control amount, of the energy storage device and the preset quality control amount.
4. The method for regulating the output power of an energy storage inverter according to claim 3, wherein the method for determining the power quality of the output power interval is as follows:
determining the reference power quality of the output power interval through the average value of the harmonic contents of different output currents, and determining the power quality compensation quantity based on the quantity proportion of the output currents with the harmonic contents exceeding the preset harmonic contents in the output power interval;
and determining the power quality of the output power interval by utilizing the power quality compensation quantity and the reference power quality.
5. The method of claim 1, wherein when the power quality evaluation value of the energy storage device meets the requirement, the power output of the inverter is not required to be controlled, and the power output of the different junction boxes is determined according to the energy storage adjustment requirement of the energy storage device.
6. The output power adjustment method of an energy storage inverter according to claim 1, wherein the method of determining the reliability of use of the junction box is:
determining the similarity of the output current waveform and the preset current waveform through waveform characteristics of the output current waveform and the preset current waveform, dividing the output power interval into a specific output power interval and other output power intervals through historical operation data of the combiner box, judging whether the combiner box has output current with the similarity which does not meet the requirement in the specific output power interval, if so, determining the combiner box as a problem combiner box, and if not, entering the next step;
determining the current similarity of different output power intervals based on the similarity of the output current waveforms of different output currents in different output power intervals of the combiner box and preset current waveforms and the number of output currents with the similarity not meeting the requirement, judging whether the current similarity of the combiner box in the specific output power interval meets the requirement, if so, entering the next step, and if not, determining the combiner box as a problem combiner box;
determining screening current similarity of the combiner box according to current similarity of the combiner box in different specific output power intervals and historical operation time length proportion of the specific output power intervals, judging whether the screening current similarity of the combiner box meets requirements, if yes, entering the next step, and if no, determining the combiner box as a problem combiner box;
and acquiring historical operation time length of the combiner box and current similarity of different output power intervals, and determining the use reliability of the combiner box by combining the screening current similarity of the combiner box, the number of the output power intervals with the current similarity meeting the requirements and the historical operation time length ratio.
7. The method of claim 6, wherein the predetermined current waveform is determined based on a current waveform of a power transmission line to which the energy storage device is connected.
8. The method for regulating output power of an energy storage inverter according to claim 1, wherein the method for determining output reliability is:
and determining the historical operation time length of the inverter in different similarity intervals according to the similarity between the output current waveform of the inverter and the preset current waveform, and determining the output reliability of the inverter according to the historical operation time length of the inverter in different similarity intervals.
9. The method of adjusting output power of an energy storage inverter of claim 1, wherein determining output power of different combiner boxes and inverters comprises:
determining the output current similarity of different reliable combiner boxes and inverters according to the similarity of the output current waveforms of the different reliable combiner boxes and the inverters, and determining the energy storage adjustment priority of the different inverters and the reliable combiner boxes based on the output current similarity;
determining whether the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box meet requirements or not based on the output power of the energy storage device and the output power ranges of the inverter with the specific energy storage adjustment priority and the reliable combiner box, if so, determining the output power of different inverters and the combiner box according to the output reliability of the inverter with the specific energy storage adjustment priority and the use reliability of the reliable combiner box;
the output reliability of the inverters with the specific energy storage adjustment priorities and the use reliability of the reliable combiner box are used for determining the output power of the different inverters with the specific energy storage adjustment priorities and the combiner box, the output power deviation of the energy storage device is determined by combining the output power of the energy storage device, and the output reliability of the inverters with the other energy storage adjustment priorities and the use reliability of the reliable combiner box are determined according to the output power deviation of the energy storage device.
10. A computer device, comprising: a communicatively coupled memory and processor, and a computer program stored on the memory and capable of running on the processor, characterized by: the processor, when executing the computer program, performs a method of regulating the output power of an energy storage inverter as claimed in any one of claims 1-9.
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