A multi-source microgrid collaborative control method and system

Abstract

The present invention provides a multi-source microgrid collaborative control method and system, belonging to the field of microgrid technology, specifically comprising: when it is determined through abnormal power supply data and power quality that the power supply reliability of a power supply form does not meet the requirements, the time period of the power supply form is used as the matching period, and the matching coefficients of different time periods of the current date and the power supply form and the suspected matching period are determined according to the similarity between the weather data of different time periods of the current date and the matching period and the distribution of different matching time periods; when in the suspected matching period, an economic function is constructed to determine the economic losses of different power supply forms, and the determination of the power supply form is improved in combination with the remaining capacity of the energy storage device under different power supply forms and the power supply reliability of different power supply forms, thereby ensuring the reliability of power supply of the microgrid.

Description

Technical Field

[0001] The present invention belongs to the technical field of microgrids, and in particular relates to a multi-source microgrid collaborative control method and system. Background Art

[0002] Unlike traditional large power grids, microgrids can automatically switch between the large power grid and the large power grid according to their own needs, which greatly improves the reliability of power users in the microgrid and reduces the impact of the large power grid on power users in the microgrid. However, at the same time, since microgrids often contain multiple power sources such as municipal electricity, wind power or solar energy, hybrid energy storage equipment, etc., how to achieve coordinated control between different power sources in the microgrid has become a technical problem that needs to be solved urgently.

[0003] The existing technical solutions often predict the power generation of new energy in the microgrid and generate differentiated power supply control strategies based on the prediction results, thereby greatly reducing the impact of frequent charging and discharging on the operating life of energy storage equipment. However, it is not difficult to find the following technical problems through analysis:

[0004] When coordinating and controlling the power supply of a microgrid, especially solar energy and wind energy, there is often a certain degree of randomness. Any form of energy may meet the power quality requirements, but when combined, the power quality of the AC bus or DC bus of the microgrid may not meet the requirements. Therefore, if the above factors are not considered, the energy supply reliability of the microgrid cannot be guaranteed.

[0005] In response to the above technical problems, the present invention provides a multi-source microgrid collaborative control method and system. Summary of the invention

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] In order to solve the above technical problems, the present invention provides a multi-source microgrid coordinated control method, which specifically includes:

[0008] S1 divides the power supply forms according to the different power supply forms used by the microgrid, and determines the abnormal power quality data under different power supply forms based on the monitoring data of the power quality of the busbar of the microgrid under different power supply forms, determines that the power quality of the power supply form meets the requirements based on the abnormal power quality data, and proceeds to the next step;

[0009] S2 determines abnormal power supply data under different power supply forms based on the power monitoring data under different power supply forms, and when it is determined through the abnormal power supply data and the power quality that the power supply reliability of the power supply form does not meet the requirements, proceeds to the next step;

[0010] S3 uses the time period of the power supply form as the matching time period, and determines the matching coefficients of different time periods of the current date and the power supply form and the suspected matching time period according to the similarity between the weather data of different time periods of the current date and the matching time period and the distribution of different matching time periods;

[0011] S4: During the suspected matching period, an economic function is constructed to determine the economic losses of different power supply forms, and the determination of the improved power supply form is performed in combination with the remaining capacity of the energy storage device under different power supply forms and the power supply reliability of different power supply forms.

[0012] The beneficial effects of the present invention are:

[0013] 1. In the present invention, whether the power quality of the power supply form meets the requirements is determined based on the power quality abnormality data, thereby avoiding the technical problem of power quality problems in the microgrid due to abnormal power quality in the power supply form, improving the power quality of the power supply, and further improving the power supply reliability of the microgrid.

[0014] 2. In the present invention, the determination of the improved power supply form is performed based on the economic losses of the power supply form, the remaining capacity of the energy storage device under different power supply forms, and the power supply reliability of different power supply forms. Not only the differences in economic benefits of different power supply forms caused by the differences in economic losses of the power supply forms are taken into account, but also by further combining the remaining capacity of the energy storage device and the power supply reliability, not only the power supply reliability of the current time period is guaranteed, but also the power supply reliability of subsequent time periods is guaranteed, so that the safety and reliability of the power supply of the microgrid are further improved.

[0015] A further technical solution is that the power supply form includes different energy storage devices for hybrid energy storage, photovoltaic energy, wind energy and city electricity.

[0016] A further technical solution is that the power supply form includes a combination of different energy storage devices using hybrid energy storage, photovoltaics, wind energy and municipal electricity.

[0017] A further technical solution is that the monitoring data of the power quality is determined based on the analysis results of the monitoring data of the current and voltage waveforms of the bus.

[0018] A further technical solution is that the power quality abnormality data includes the number of power quality abnormalities, the power quality at different power quality abnormality times and the duration of the abnormality.

[0019] A further technical solution is that the method for determining the improved power supply form is:

[0020] Determine the economic losses of different power supply forms based on the amount of mains power supplied by different power supply forms;

[0021] Determine the reliability of energy storage under different power supply forms by using the remaining capacity of energy storage devices under different power supply forms;

[0022] The comprehensive reliability coefficients of different power supply forms are determined by considering the power supply reliability, energy storage reliability and economic losses of different power supply forms, and the improved power supply form is determined based on the comprehensive reliability coefficients.

[0023] In a second aspect, the present invention provides a computer system comprising: a memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, the above-mentioned multi-source microgrid collaborative control method is executed.

[0024] Other features and advantages will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 is a flow chart of a multi-source microgrid collaborative control method;

[0028] Figure 2 is a flow chart of a method for determining a suspected matching period;

[0029] Figure 3 is a flow chart of a method for improving determination of power supply form. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0031] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0032] Example 1

[0033] To solve the above problems, according to one aspect of the present invention, Figure 1 As shown, a multi-source microgrid coordinated control method is provided, which specifically includes:

[0034] S1 divides the power supply forms according to the different power supply forms used by the microgrid, and determines the abnormal power quality data under different power supply forms based on the monitoring data of the power quality of the busbar of the microgrid under different power supply forms, determines that the power quality of the power supply form meets the requirements based on the abnormal power quality data, and proceeds to the next step;

[0035] S2 determines abnormal power supply data under different power supply forms based on the power monitoring data under different power supply forms, and when it is determined through the abnormal power supply data and the power quality that the power supply reliability of the power supply form does not meet the requirements, proceeds to the next step;

[0036] S3 uses the time period of the power supply form as the matching time period, and determines the matching coefficients of different time periods of the current date and the power supply form and the suspected matching time period according to the similarity between the weather data of different time periods of the current date and the matching time period and the distribution of different matching time periods;

[0037] S4: During the suspected matching period, an economic function is constructed to determine the economic losses of different power supply forms, and the determination of the improved power supply form is performed in combination with the remaining capacity of the energy storage device under different power supply forms and the power supply reliability of different power supply forms.

[0038] Furthermore, the power supply forms include different energy storage devices of hybrid energy storage, photovoltaic energy, wind energy and city electricity.

[0039] It should be noted that the power supply form includes a combination of one or more of different energy storage devices, photovoltaics, wind energy and city electricity using hybrid energy storage.

[0040] It can be understood that the monitoring data of the power quality is determined based on the analysis results of the monitoring data of the current and voltage waveforms of the bus.

[0041] It should be further explained that the power quality abnormality data includes the number of power quality abnormalities, the power quality at different power quality abnormality times, and the duration of the abnormality.

[0042] Further, determining whether the power quality of the power supply form meets the requirements specifically includes:

[0043] Acquire historical power supply data using the power supply form, and determine the historical power supply times and historical power supply duration using the power supply form using the historical power supply data;

[0044] Determine the number of power supplies with abnormal power quality based on the power quality abnormality data, and determine the basic power quality assessment value of the power supply form according to the ratio of the number of power supplies with abnormal power quality to the historical power supply number, and the ratio of the cumulative power supply duration of different power supply times with abnormal power quality to the historical power supply duration;

[0045] Determine the power quality abnormality values ​​of different power supply times with abnormal power quality according to the power supply duration of different power supply times with abnormal power quality, the number of power quality abnormality moments and the voltage distortion rate at different power quality abnormality moments;

[0046] The basic power quality assessment value of the power supply form is corrected based on the power quality abnormality values ​​of different power supply times with abnormal power quality to obtain the power quality of the power supply form, and whether the power quality of the power supply form meets the requirements is determined by a preset quality threshold.

[0047] It should be further explained that determining whether the power quality of the power supply form meets the requirements by presetting the quality threshold specifically includes:

[0048] When the power quality of the power supply form is less than the preset quality threshold, it is determined that the power quality of the power supply form does not meet the requirement.

[0049] In another embodiment, determining that the power quality of the power supply form meets the requirements specifically includes:

[0050] S11: acquiring historical power supply data of the power supply form, and determining the historical power supply times and historical power supply duration of the power supply form by using the historical power supply data;

[0051] S12 determines the number of power supplies with abnormal power quality based on the power quality abnormality data, and determines whether the power quality of the power supply form meets the requirements according to the ratio of the number of power supplies with abnormal power quality to the historical power supply times, if yes, proceeds to the next step, if not, determines that the power quality of the power supply form does not meet the requirements;

[0052] S13 determines the basic power quality evaluation value of the power supply form according to the ratio of the cumulative power supply duration of different power supply times with abnormal power quality to the historical power supply duration, and the ratio of the power supply times with abnormal power quality to the historical power supply times, and judges whether the basic power quality evaluation value of the power supply form meets the requirements. If so, proceed to the next step; if not, determine that the power quality of the power supply form does not meet the requirements;

[0053] S14 determines the power quality abnormality values ​​of different power supply times with abnormal power quality according to the power supply duration of different power supply times with abnormal power quality, the number of power quality abnormality moments and the voltage distortion rate at different power quality abnormality moments, and judges whether there are power supply times with abnormal power quality values ​​that do not meet the requirements. If yes, proceed to the next step, if not, proceed to step S17;

[0054] S15 determines whether the number of power supply times in which the power quality abnormal value does not meet the requirement meets the requirement, if so, proceeds to the next step, if not, determines that the power quality of the power supply form does not meet the requirement;

[0055] S16 determines the power quality screening abnormality value according to the power supply times for which the power quality abnormality value does not meet the requirements and the power quality abnormality value for which different power quality abnormality values ​​do not meet the requirements, and judges whether the power quality screening abnormality value meets the requirements. If so, proceeds to the next step; if not, determines that the power quality of the power supply form does not meet the requirements;

[0056] S17 corrects the basic power quality assessment value of the power supply form based on the power quality abnormality values ​​of different power supply times with abnormal power quality to obtain the power quality of the power supply form, and determines whether the power quality of the power supply form meets the requirements through a preset quality threshold.

[0057] Furthermore, the abnormal power supply data includes the number of power supplies including abnormal power supply, the number of abnormal power supply moments and the severity of different types of abnormal power supply types including the number of power supplies including abnormal power supply.

[0058] It should be noted that the abnormal power supply types include abnormal power supply interruption, power supply voltage fluctuation, insufficient power supply capacity and insufficient power supply.

[0059] It is understandable that determining that the power supply reliability of the power supply form does not meet the requirements specifically includes:

[0060] Acquire historical power supply data using the power supply form, and determine the number of historical power supplies using the power supply form using the historical power supply data;

[0061] Determine the number of power supply times including abnormal power supply based on the abnormal power supply data, and determine different power supply abnormality values ​​including abnormal power supply according to different power supply durations including abnormal power supply, the number of abnormal power supply moments of different abnormal power supply types including different power supply times including abnormal power supply, and the severity;

[0062] Obtaining the number of power supplies including abnormal power supplies and the ratio thereof to the number of historical power supplies using the power supply form, and determining a comprehensive power supply abnormality value in combination with the power supply abnormality values ​​of different power supply times including abnormal power supplies;

[0063] A power supply reliability assessment amount of the power supply form is determined according to the comprehensive power supply abnormality value and the power quality, and whether the power supply reliability of the power supply form meets the requirements is determined through the power supply reliability assessment amount of the power supply form.

[0064] Further, determining whether the power supply reliability of the power supply form meets the requirements through the power supply reliability evaluation amount of the power supply form specifically includes:

[0065] When the power supply reliability evaluation value of the power supply form is less than a preset reliability threshold, it is determined that the power supply reliability of the power supply form does not meet the requirements.

[0066] It should be noted that when the power supply reliability of the power supply form meets the requirements, it is determined that there is no need to improve the power supply form during the period of time when the power supply form is adopted.

[0067] In another embodiment, determining that the power supply reliability of the power supply form does not meet the requirement specifically includes:

[0068] Determine the number of power supplies including abnormal power supply based on the abnormal power supply data, and judge whether the number of power supplies including abnormal power supply meets the requirements, if yes, proceed to the next step, if not, determine that the power supply reliability of the power supply form does not meet the requirements;

[0069] Obtain historical power supply data using the power supply form, and use the historical power supply data to determine the number of historical power supplies using the power supply form, and judge whether the ratio of the number of power supplies including abnormal power supply to the number of historical power supplies using the power supply form meets the requirements, if so, proceed to the next step, if not, determine that the power supply reliability of the power supply form does not meet the requirements;

[0070] The number of power supply times including abnormal power supply is determined based on the abnormal power supply data, and different power supply abnormality values ​​of the power supply times including abnormal power supply are determined according to different power supply durations including abnormal power supply, the number of abnormal power supply moments of different abnormal power supply types and the severity of different power supply times including abnormal power supply, and it is judged whether there is a power supply time including abnormal power supply whose power supply abnormality value does not meet the requirements, if not, proceed to the next step, and if so, determine that the power supply reliability of the power supply form does not meet the requirements;

[0071] Determine the abnormal severity of different abnormal power supply types by the number and severity of abnormal power supply moments of different abnormal power supply types, and judge whether there is an abnormal power supply type whose abnormal severity does not meet the requirements. If not, proceed to the next step. If so, determine that the power supply reliability of the power supply form does not meet the requirements.

[0072] The number of power supplies including abnormal power supply and its ratio to the historical number of power supplies using the power supply form are obtained, and a comprehensive power supply abnormality value is determined in combination with the power supply abnormality values ​​of the different power supply times including abnormal power supply. A power supply reliability assessment amount of the power supply form is determined according to the comprehensive power supply abnormality value and the electric energy quality, and whether the power supply reliability of the power supply form meets the requirements is determined through the power supply reliability assessment amount of the power supply form.

[0073] Specifically, Figure 2 As shown, the method for determining the suspected matching period is:

[0074] Determine the similarity between the weather data of different time periods of the current date and the weather data of different matching time periods according to the similarity between the weather data of different time periods of the current date and the weather data of different matching time periods, and determine the weather similarity evaluation amount of different time periods of the current date based on the similarity between the weather data of different matching time periods;

[0075] Determine the number of time period matches between different time periods and matching time periods based on the distribution of different matching time periods, and determine the time period distribution similarity of different time periods in combination with the time deviation between different matching time periods and the time periods;

[0076] The matching coefficients of different time periods and the power supply forms are determined by using the time period distribution similarity and weather similarity evaluation amount of different time periods, and the suspected matching time periods are screened using the matching coefficients.

[0077] Furthermore, the matching coefficient is used to screen the suspected matching time period, specifically including:

[0078] The period when the matching coefficient is greater than the preset matching threshold is regarded as a suspected matching period.

[0079] In another embodiment, the method for determining the suspected matching period is:

[0080] Determine the number of time period matches between different time periods and the matching time period based on the distribution of different matching time periods, and judge whether the number of time period matches is greater than the preset number of matching time periods. If so, determine that the time period is a suspected matching time period, and if not, proceed to the next step;

[0081] Determine the distribution concentration of the time periods corresponding to the different matching time periods according to the distribution of the different matching time periods, and use the distribution concentration to determine the credible time period to determine whether the time period belongs to the credible time period. If so, determine that the time period is a suspected matching time period. If not, proceed to the next step.

[0082] Determine the time period distribution similarity of different time periods according to the number of time period matches between different time periods and matching time periods and the time deviation between different matching time periods and the time periods, and judge whether the time period distribution similarity of the time periods meets the requirements. If so, determine that the time period is a suspected matching time period, if not, proceed to the next step;

[0083] Determine the similarity between the weather data of different time periods of the current date and the weather data of different matching time periods, and judge whether the number of matching time periods whose weather data similarity is greater than a preset similarity is greater than the preset number of matching time periods. If so, determine that the time period is a suspected matching time period. If not, proceed to the next step.

[0084] Determine the weather similarity evaluation amount of different time periods of the current date by comparing the weather data similarity with the weather data of different matching time periods, and judge whether the weather similarity evaluation amount of the time period meets the requirements. If so, determine that the time period is a suspected matching time period, and if not, proceed to the next step;

[0085] The matching coefficients of different time periods and the power supply forms are determined by using the time period distribution similarity and weather similarity evaluation amount of different time periods, and the suspected matching time periods are screened using the matching coefficients.

[0086] Specifically, Figure 3 As shown, the method for determining the improved power supply form is:

[0087] Determine the economic losses of different power supply forms based on the amount of mains power supplied by different power supply forms;

[0088] Determine the reliability of energy storage under different power supply forms by using the remaining capacity of energy storage devices under different power supply forms;

[0089] The comprehensive reliability coefficients of different power supply forms are determined by considering the power supply reliability, energy storage reliability and economic losses of different power supply forms, and the improved power supply form is determined based on the comprehensive reliability coefficients.

[0090] Example 2

[0091] On the other hand, the present invention provides a computer system, comprising: a memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, the above-mentioned multi-source microgrid collaborative control method is executed.

[0092] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0093] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0094] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims

1. A multi-source microgrid collaborative control method, characterized in that: Specifically include: The power supply forms are divided according to the different power supply forms used by the microgrid for power supply, and the abnormal power quality data under different power supply forms are determined based on the monitoring data of the power quality of the busbar of the microgrid under different power supply forms, and the power quality of the power supply form is determined to meet the requirements based on the abnormal power quality data, and the next step is entered; Determine abnormal power supply data under different power supply forms based on the power monitoring data under different power supply forms, and when it is determined through the abnormal power supply data and the power quality that the power supply reliability of the power supply form does not meet the requirements, proceed to the next step; The time period when the power supply form is adopted is used as the matching time period, and the matching coefficients of different time periods of the current date and the power supply form and the suspected matching time periods are determined according to the similarity between the weather data of different time periods of the current date and the matching time period and the distribution of different matching time periods; During the suspected matching period, an economic function is constructed to determine the economic losses of different power supply forms, and the determination of the improved power supply form is performed in combination with the remaining capacity of the energy storage device under different power supply forms and the power supply reliability of different power supply forms; Determine that the power quality of the power supply form meets the requirements, including: Acquire historical power supply data using the power supply form, and determine the historical power supply times and historical power supply duration using the power supply form using the historical power supply data; Determine the number of power supplies with abnormal power quality based on the power quality abnormality data, and determine the basic power quality assessment value of the power supply form according to the ratio of the number of power supplies with abnormal power quality to the historical power supply number, and the ratio of the cumulative power supply duration of different power supply times with abnormal power quality to the historical power supply duration; Determine the power quality abnormality values ​​of different power supply times with abnormal power quality according to the power supply duration of different power supply times with abnormal power quality, the number of power quality abnormality moments and the voltage distortion rate at different power quality abnormality moments; Based on the power quality abnormality values ​​of different power supply times with abnormal power quality, the basic power quality assessment value of the power supply form is corrected to obtain the power quality of the power supply form, and whether the power quality of the power supply form meets the requirements is determined by a preset quality threshold; Determining that the power supply reliability of the power supply form does not meet the requirements, specifically including: Acquire historical power supply data using the power supply form, and determine the number of historical power supplies using the power supply form using the historical power supply data; Determine the number of power supply times including abnormal power supply based on the abnormal power supply data, and determine different power supply abnormality values ​​including abnormal power supply according to different power supply durations including abnormal power supply, the number of abnormal power supply moments of different abnormal power supply types including different power supply times including abnormal power supply, and the severity; Obtaining the number of power supplies including abnormal power supplies and the ratio thereof to the number of historical power supplies using the power supply form, and determining a comprehensive power supply abnormality value in combination with the power supply abnormality values ​​of different power supply times including abnormal power supplies; A power supply reliability assessment amount of the power supply form is determined according to the comprehensive power supply abnormality value and the power quality, and whether the power supply reliability of the power supply form meets the requirements is determined through the power supply reliability assessment amount of the power supply form.

2. The multi-source microgrid coordinated control method according to claim 1, characterized in that: The power supply forms include different energy storage devices of hybrid energy storage, photovoltaic, wind energy and municipal electricity.

3. The multi-source microgrid coordinated control method according to claim 2, characterized in that: The power supply form includes a combination of different energy storage devices using hybrid energy storage, photovoltaics, wind energy and city electricity.

4. The multi-source microgrid coordinated control method according to claim 1, characterized in that: The power quality abnormality data includes the number of power quality abnormalities, the power quality at different power quality abnormality times, and the duration of the abnormality.

5. The multi-source microgrid coordinated control method according to claim 1, characterized in that: Determining whether the power quality of the power supply form meets the requirements by presetting the quality threshold includes: When the power quality of the power supply form is less than the preset quality threshold, it is determined that the power quality of the power supply form does not meet the requirement.

6. The multi-source microgrid coordinated control method according to claim 1, characterized in that: The abnormal power supply data includes the number of power supplies including abnormal power supply, the number of abnormal power supply moments of different types of abnormal power supply including the number of power supplies including abnormal power supply, and the severity.

7. The multi-source microgrid coordinated control method according to claim 1, characterized in that: Determining whether the power supply reliability of the power supply form meets the requirements through the power supply reliability evaluation amount of the power supply form specifically includes: When the power supply reliability evaluation value of the power supply form is less than a preset reliability threshold, it is determined that the power supply reliability of the power supply form does not meet the requirements.

8. A computer system comprising: A memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, a multi-source microgrid collaborative control method as described in any one of claims 1-7 is executed.

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