CN117410966B - Control method for rapid power switching of flexible interconnection faults in distribution area - Google Patents
Control method for rapid power switching of flexible interconnection faults in distribution area Download PDFInfo
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- 238000012216 screening Methods 0.000 claims abstract description 7
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- 238000012544 monitoring process Methods 0.000 claims description 15
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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Abstract
The invention relates to the technical field of electric power, in particular to a power distribution area flexible interconnection fault rapid power transfer control method, which comprises the following steps: step 1, dividing a power distribution area into a plurality of power utilization areas, and distributing electric quantity of the corresponding areas at a total power supply end of the power distribution area according to the historical power utilization condition of any power utilization area; step 2, judging the electricity demand condition according to the electricity consumption condition analysis of each electricity consumption region for a period of power supply time; step 3, judging whether any power utilization area enters a power supply capacity judgment of the power storage unit; step 4, screening and marking the power-required area for the power-used area entering the power supply capacity judgment; step 5, judging whether the power-required area enters a regional energy storage and power supply judgment; and 6, determining one or a plurality of areas of the different-area electricity compensation for the electricity utilization areas incapable of carrying out the different-area electricity compensation. The invention provides the control method for rapidly converting the flexible interconnection faults into the power supply of the power distribution area, which has the flexible interconnection system for the power distribution area and improves the utilization rate of the residual capacity.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a flexible interconnection fault quick power switching control method for a power distribution area.
Background
At present, in order to solve the problems of overhigh short-circuit current level, potential safety hazards of an electromagnetic ring network and the like, a 220kV voltage class grading division and slice operation mode is commonly adopted for a large-scale urban power grid. However, the grid partition operation also has some problems, such as excessive short-circuit current of the system, incapability of mutually providing emergency power support between partitions, insufficient power supply capacity, more obvious deficiency of dynamic reactive power support and the like. The flexible interconnection of the urban power grids in a zoning way by adopting a flexible power electronic technology is a novel technical means for solving the problems
Chinese patent publication No.: CN114142515a. The invention discloses a flexible interconnection coordination control method and device for a distribution network, wherein the method comprises the steps of controlling the operation of an alternating current port of a flexible interconnection device, controlling the multi-source load of an alternating current and direct current power grid and coordinating and controlling an alternating current and direct current co-construction area; the operation control of the alternating current port of the flexible interconnection device comprises steady-state control of the alternating current port and fault load transfer control of an alternating current power grid, and the fault load transfer control of the alternating current power grid is preferentially carried out; the AC/DC power grid multi-element source load control is to carry out regional autonomous control on an AC source load and a DC source load under the condition that a novel DC load is connected to a DC side, wherein the novel DC load comprises a photovoltaic, energy storage or charging pile; the AC/DC co-construction area coordination control comprises DC voltage coordination control and converter capacity coordination control. Therefore, the coordination control method for the flexible interconnection of the distribution network has the following problems: the load capacity of the distribution block grid cannot be balanced according to the pre-supply control of the power utilization area.
Disclosure of Invention
Therefore, the invention provides a power distribution area flexible interconnection fault rapid power transfer control method, which is used for solving the problem of balancing the load capacity of a power distribution area power grid according to the pre-power supply control of a power utilization area in the prior art.
In order to achieve the above purpose, the invention provides a power distribution area flexible interconnection fault fast power transfer control method, which comprises,
step S1, dividing a power distribution area into a plurality of power utilization areas, and adjusting the electric quantity distribution value of a total power supply end of the power distribution area aiming at the power utilization areas to a corresponding value according to the historical power utilization condition of any power utilization area;
step S2, for a single power utilization area, according to the actual power utilization condition in the historical power supply period of the power utilization area, the power utilization condition of the power utilization area in the next power utilization judgment period is calculated through simulation in a pre-power demand model;
step S3, screening and marking a power supply area according to the simulated power demand condition of the single power utilization area, and determining whether to enter power supply fault estimation judgment;
step S4, screening and marking the power-required area for any power-used area entering power supply fault prediction judgment, and determining the power-used area for carrying out regional energy storage and power supply;
step S5, judging a power supply mode finally entered into any power demand area according to a pre-power demand analog value of the power demand area, wherein the power supply mode comprises regional energy storage power supply and different regional energy storage power supply;
and S6, carrying out different-region electricity supplementing evaluation on any electricity-required region which does not accord with the regional energy storage and power supply condition, and determining one or a plurality of regions of different-region electricity supplementing to supply power to the electricity-used region.
Further, in step S1, in the process of performing regional power distribution by the total power supply end of the distribution substation, corresponding regional power distribution is performed by the total power supply end of the distribution substation according to historical power consumption conditions in the same cycle and the cycle;
and for any electricity utilization area, the same-ratio period and the ring-ratio period exist at the total electricity supply end of the power distribution area, and the electricity distribution value of the total electricity supply end of the power distribution area for the electricity utilization area is determined according to the electricity utilization trend of the same-ratio period and the ring-ratio period.
Further, in step S2, a power storage unit and an area power consumption monitoring unit are stored in any power consumption area, where the power storage unit is used to store the residual power of the power consumption area in any power consumption period and record the actual power consumption situation of the power consumption area;
for any electricity utilization area, a pre-electricity utilization model is stored in the electricity storage unit, electricity utilization judging periods are stored in the pre-electricity utilization model, actual electricity utilization is calculated according to actual electricity utilization on the starting day and actual electricity utilization on the ending day of the electricity utilization judging periods, pre-electricity utilization simulation of the next electricity utilization judging period is carried out on the actual electricity utilization in the pre-electricity utilization model, a pre-electricity utilization simulation value is calculated, and according to the size of the pre-electricity utilization simulation value, electricity utilization conditions of the electricity utilization area in the next electricity utilization judging period are judged in the area electricity utilization monitoring unit.
Further, in step S3, for any power utilization area, there is an area power utilization threshold in the area power utilization monitoring unit, which is the maximum power utilization amount in one power utilization judging period of the power utilization area;
when the analog value of the pre-needed electric quantity is larger than the regional power consumption threshold value, the power consumption region enters power supply fault estimation judgment;
and when the analog value of the pre-needed electric quantity is smaller than or equal to the regional power consumption threshold value, continuing to judge the electric quantity needed condition of the next power consumption judging period, and marking the power consumption region as a power supply region.
Further, in step S4, for any power utilization area, a power supply failure evaluation value is calculated according to the analog value of the pre-required power and the power-required difference value of the power utilization threshold value of the area, and the power supply failure condition of the power utilization area is estimated and judged;
for any electricity utilization area, a power supply fault evaluation threshold value and an evaluation parameter are stored in an area electricity utilization monitoring unit, and the evaluation parameter is in direct proportion to a power demand difference value;
if the power supply fault evaluation value is greater than or equal to the power supply fault evaluation threshold value, marking the power utilization area as a power demand area, and entering an area energy storage power supply judgment;
if the power supply fault evaluation value is smaller than the power supply fault evaluation threshold value, continuing to judge the power supply capacity of the power utilization area, and judging that the power utilization area performs regional energy storage power supply in the next power utilization judging period.
Further, in step S5, for any power-required area, whether the power-required area can smoothly enter the area for energy storage and power supply is determined according to the analog value of the pre-power-required amount of the power-required area;
for any electricity utilization area, a discharge threshold value is stored in the electricity storage unit, wherein the discharge threshold value is related to an electricity storage value stored in the electricity storage unit in the electricity utilization area, and a fixed proportion parameter is stored in the electricity storage unit;
when the analog value of the pre-needed electric quantity is larger than the discharge threshold value, entering into the evaluation and judgment of energy storage and power supply in different areas;
and when the analog value of the pre-needed electric quantity is smaller than or equal to the discharge threshold value, the power is supplied to the energy storage of the area of the power storage unit.
Further, in step S6, all the power supply areas are summarized and the available power of the power storage unit of each power supply area is calculated, wherein the available power is related to the transportable energy storage power of each power supply area, and the available power and the stored power of the power storage unit have fixed transportable ratio parameters.
Further, in step S6, for any power-requiring area that enters the evaluation and determination of the power-requiring area for energy storage and power supply, a power-consuming area power supply module is stored in the area power-consuming monitoring unit of the power-consuming area, and calculates a power-saving power-supplying score value of the different area according to the distance between any power-requiring area and each power-supplying area and the power-supplying amount of each power-supplying area, and compares the power-saving power-supplying score value with a power-saving power-supplying score threshold value of the different area stored in the power-consuming area power supply module to determine whether any power-consuming area can perform power supply of the different area for the power-requiring area;
if the grading value of the energy storage power supply in the different area is larger than or equal to the grading threshold value of the energy storage power supply in the different area, reserving the power supply area, and judging the power supply in the different area of the next power supply area;
if the different-area energy storage power supply scoring value is smaller than the different-area energy storage power supply scoring threshold value, deleting the power supply area, and judging different-area power supply of the next power supply area;
and (3) sorting the different-area power supply judgment of all the power supply areas until the different-area power supply judgment of all the power supply areas is completed, and selecting the power supply area with the largest different-area energy storage power supply grading value to supply power.
Further, when judging whether any power supply area can supply power to the power supply area in different areas, a distance evaluation parameter and an electric quantity evaluation parameter are stored in any power supply area, wherein the distance evaluation parameter is inversely proportional to the distance between the power supply area and the power supply area, and the electric quantity evaluation parameter is directly proportional to the power supply amount of each power supply area.
Further, the actual received electric quantity of the power-required area is monitored in real time, calculation and statistics are carried out on the actual received electric quantity in the power supply module of the different area, and the power supply of the different area is judged to stop;
if the actual received electric quantity is smaller than the analog value of the pre-required electric quantity in the power-required area, different-area power supply of the next ordered power supply area is performed until the actual received electric quantity is equal to the analog value of the pre-required electric quantity in the power-required area;
if the actual received electric quantity is equal to the analog value of the pre-required electric quantity of the power-required area, the power supply in the different areas of the power supply area is stopped, and the operation judgment of the next power utilization judgment period of the power-required area is performed.
Compared with the prior art, the method has the beneficial effects that the flexible interconnection fault quick power supply switching control method for the power distribution station has the flexible interconnection system for the power distribution station, interconnection and mutual supply of all power utilization areas in the power distribution station are performed, the load is balanced, the utilization rate of the residual capacity is improved, the information interaction and analysis processing of all power utilization areas in the power distribution station are accelerated, the emergency power support is controlled to be provided among all power utilization areas, and the power supply capacity in the power distribution station is fully exerted.
Further, by analyzing historical electricity consumption conditions of a plurality of electricity consumption areas in the distribution area, the invention ensures that the supplied power of the total power supply end of the distribution area meets the requirements of the electricity consumption areas, and reduces the power failure risk of the electricity consumption areas.
Further, the power consumption area is subjected to prediction processing in the power consumption judging period, the period power supply electric quantity is determined, and the reverse power phenomenon of the flexible interconnection system of the distribution area in the actual power supply process is ensured, so that the power grid is in a state when running, the power supply capacity of the power storage unit is predicted when the analog value of the pre-required electric quantity exceeds, the power storage unit is ensured not to suddenly fail, and the loss of power equipment is reduced.
Further, the invention judges whether the power consumption area is marked according to the power consumption score of the next power consumption judging period by carrying out power supply fault evaluation on the power consumption difference value in the power consumption area, marks the power consumption area, and continuously carries out power supply capacity judgment in the power consumption area which does not need to be regulated so as to ensure that the power grid is in a normal running state.
Further, the method and the device screen the energy storage power supply which can enter the areas according to the power supply fault evaluation value to determine a proper energy storage power supply mode of the areas, reduce the loss caused by the power supply in different places by preferentially carrying out local energy storage power supply, limit the range of the energy storage power supply, ensure that the energy storage unit stores emergency electric quantity and prevent the power failure loss caused by sudden faults of the power grid.
Furthermore, the invention calculates the available power of the power storage units of the power supply areas, gathers the available power of each power supply area, facilitates the evaluation and judgment of the energy storage and power supply of the different areas in the next step, and simultaneously sets the fixed transportable proportion parameters to protect the transported electric quantity value of the area transporting the power supply of the different areas, thereby ensuring the power supply of the different areas and ensuring the normal operation of the power supply areas.
Further, the invention judges whether the power supply area meets the requirement of different-area energy storage power supply by calculating the different-area energy storage power supply grading value of the power supply area power storage unit, reduces unnecessary power transmission loss in the different-area power supply process, and ensures that the power demand area and the power supply area are in a benign state of interconnection and mutual power supply.
Further, the invention monitors the received electric quantity of the electric-required area in real time, prevents excessive electric energy from being lost in the process of supplying power to different areas, provides enough electric quantity for the electric-required area which can not support the operation of the electric-required area, judges the operation period of the area of which the actual received electric quantity meets the analog value of the pre-required electric quantity of the electric-required area, and continues to judge the operation of the next electric-required judgment period of the electric-required area.
Drawings
Fig. 1 is a flowchart of a power distribution area flexible interconnection fault fast power transfer control method according to the embodiment;
FIG. 2 is a flow chart of the present embodiment for determining the power demand condition of the power consumption region in the next power consumption determination period;
FIG. 3 is a flowchart of the present embodiment for performing pre-estimation determination on the power failure condition of the power utilization area;
FIG. 4 is a flow chart of determining whether the power-on area can smoothly enter the area for energy storage and power supply according to any of the power-on areas of the present embodiment.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, fig. 1 is a flowchart of a power distribution area flexible interconnection fault fast power transfer control method according to the present embodiment.
The invention provides a power distribution area flexible interconnection fault rapid power transfer control method which is characterized by comprising the following steps of,
step S1, dividing a power distribution area into a plurality of power utilization areas, and adjusting the electric quantity distribution value of a total power supply end of the power distribution area aiming at the power utilization areas to a corresponding value according to the historical power utilization condition of any power utilization area;
step S2, for a single power utilization area, according to the actual power utilization condition in the historical power supply period of the power utilization area, the power utilization condition of the power utilization area in the next power utilization judgment period is calculated through simulation in a pre-power demand model;
step S3, screening and marking a power supply area according to the simulated power demand condition of the single power utilization area, and determining whether to enter power supply fault estimation judgment;
step S4, screening and marking the power-required area for any power-used area entering power supply fault prediction judgment, and determining the power-used area for carrying out regional energy storage and power supply;
step S5, judging a power supply mode finally entered into any power demand area according to a pre-power demand analog value of the power demand area, wherein the power supply mode comprises regional energy storage power supply and different regional energy storage power supply;
and S6, carrying out different-region electricity supplementing evaluation on any electricity-required region which does not accord with the regional energy storage and power supply condition, and determining one or a plurality of regions of different-region electricity supplementing to supply power to the electricity-used region.
The invention provides the flexible interconnection fault quick power supply switching control method for the power distribution station, which is used for interconnecting and mutually supplying all power utilization areas in the power distribution station by storing a flexible interconnection system in the power distribution station, balancing loads, improving the utilization rate of residual capacity, accelerating information interaction and analysis processing of all power utilization areas in the power distribution station, controlling the power utilization areas to provide emergency power support, and fully playing the power supply capacity in the power distribution station.
Specifically, in this embodiment, in step S1, in the process of performing regional power distribution by the total power supply end of the distribution substation, corresponding regional power distribution is performed on the total power supply end of the distribution substation according to the historical power consumption conditions in the same cycle and the cyclic cycle;
and for any electricity utilization area, the same-ratio period and the ring-ratio period exist at the total electricity supply end of the power distribution area, and the electricity distribution value of the total electricity supply end of the power distribution area for the electricity utilization area is determined according to the electricity utilization trend of the same-ratio period and the ring-ratio period.
In this embodiment, the total power supply end of the power distribution area stores historical power utilization conditions of a plurality of power utilization areas within a plurality of time periods.
When the total power supply end of the power distribution station needs to supply power to the power utilization area with the number of A1 in 3 months in 2020.
Counting the total power supply end of the power distribution station, judging the power supply quantity of 3 months in 2020 according to the power supply condition of 3 months in 2019 according to the year of the same period; and judging the power supply quantity of 3 months in 2020 according to the power supply condition that the cycle of the ring ratio is 2 months in 2020. And taking the maximum power supply value as the power consumption area A1 to supply power according to the two power supply quantity judgment results.
According to the invention, by analyzing the historical electricity consumption conditions of a plurality of electricity consumption areas in the distribution area, the provided power of the total power supply end of the distribution area is ensured to meet the requirements of the electricity consumption areas, and the power failure risk of the electricity consumption areas is reduced.
Specifically, in step S2 in this embodiment, a power storage unit and an area power consumption monitoring unit are stored in any power consumption area, where the power storage unit is configured to store a remaining power of the power consumption area in any power consumption period, and record an actual power consumption situation of the power consumption area;
for any electricity utilization area, a pre-electricity utilization model is stored in the electricity storage unit, electricity utilization judging periods are stored in the pre-electricity utilization model, actual electricity utilization is calculated according to actual electricity utilization on the starting day and actual electricity utilization on the ending day of the electricity utilization judging periods, pre-electricity utilization simulation of the next electricity utilization judging period is carried out on the actual electricity utilization in the pre-electricity utilization model, a pre-electricity utilization simulation value is calculated, and according to the size of the pre-electricity utilization simulation value, electricity utilization conditions of the electricity utilization area in the next electricity utilization judging period are judged in the area electricity utilization monitoring unit.
Referring to fig. 2, fig. 2 is a flowchart illustrating a power demand situation in the next power consumption determination period in the power consumption determination area according to the present embodiment.
Specifically, in this embodiment, in step S3, for any power utilization area, there is an area power utilization threshold value stored in the area power utilization monitoring unit, which is the maximum power utilization amount in one power utilization judging period of the power utilization area;
when the analog value of the pre-needed electric quantity is larger than the regional power consumption threshold value, the power consumption region enters power supply fault estimation judgment;
and when the analog value of the pre-needed electric quantity is smaller than or equal to the regional power consumption threshold value, continuing to judge the electric quantity needed condition of the next power consumption judging period, and marking the power consumption region as a power supply region.
And a pre-electricity-demand model is stored in the electricity storage unit, and an electricity utilization judging period Tg=7 days is stored in the pre-electricity-demand model.
And in the first electricity consumption judging period of 3 months in 2020, the actual electricity consumption is 115 kilowatts, and the actual electricity consumption at the moment is subjected to electricity pre-demand simulation in a electricity pre-demand model to calculate a simulated value M1 of the electricity pre-demand.
When the analog value M1 of the electricity demand is larger than the regional electricity consumption threshold G0, entering the power supply capacity estimation judgment of the electricity storage unit; and when the analog value M1 of the pre-needed electric quantity is smaller than or equal to the regional power utilization threshold G0, continuing to judge the needed electric condition of the next power utilization judging period.
According to the invention, the period power supply electric quantity is determined by carrying out the pre-estimation processing in the power utilization judging period on the power utilization area, so that the reverse power phenomenon of the flexible interconnection system of the distribution area in the actual power supply process is ensured, the power grid is in a state when running, the power supply capacity of the power storage unit is pre-estimated when the analog value of the pre-required electric quantity exceeds, the power storage unit is ensured not to suddenly fail, and the loss of power equipment is reduced.
Referring to fig. 3, fig. 3 is a flowchart illustrating a power failure prediction determination for a power consumption area according to the present embodiment
Specifically, in this embodiment, in step S4, for any power utilization area, a power supply failure evaluation value is calculated according to a power demand difference value between a power demand analog value and an area power consumption threshold, and a power supply failure condition of the power utilization area is estimated and determined;
for any electricity utilization area, a power supply fault evaluation threshold value and an evaluation parameter are stored in an area electricity utilization monitoring unit, and the evaluation parameter is in direct proportion to a power demand difference value;
if the power supply fault evaluation value is greater than or equal to the power supply fault evaluation threshold value, marking the power utilization area as a power demand area, and entering an area energy storage power supply judgment;
if the power supply fault evaluation value is smaller than the power supply fault evaluation threshold value, continuing to judge the power supply capacity of the power utilization area, and judging that the power utilization area performs regional energy storage power supply in the next power utilization judging period.
When the electricity demand analog value m1=135 kilowatts, the electricity demand difference Δm1:
Δm1=m1-fd1=135-133=2 kilowatt hours;
the Δm1 is the electricity demand difference value of the electricity consumption area A1 of the second electricity consumption judgment period of 3 months in 2020, and the unit is ten thousand watt hours.
Power failure evaluation value P1:
P1＝ΔM1×p1；
wherein, P1 is the power failure evaluation value of the power consumption area A1 of the second power consumption judgment period of 3 months in 2020;
p1 is an evaluation parameter of the second electricity consumption determination period electricity consumption region A1 of month 3 in 2020, which is related to the value of the electricity demand difference Δm1 of the second electricity consumption determination period electricity consumption region A1 of month 3 in 2020, and the larger the electricity demand difference Δm1 of the second electricity consumption determination period electricity consumption region A1 of month 3 in 2020, the larger the evaluation parameter p1 of the second electricity consumption determination period electricity consumption region A1 of month 3 in 2020 is in units of
For the power utilization area A1, there is a power failure evaluation threshold P0 in the storage unit memory,
if the power supply fault evaluation value P1 is larger than or equal to the power supply fault evaluation threshold value P0, the power utilization area is marked as a power demand area, and the power supply area enters into the regional energy storage and power supply judgment; if the power failure evaluation value P1 is smaller than the power failure evaluation threshold value P0, the power supply capability determination is continued for the power utilization area.
According to the invention, through carrying out power supply fault assessment on the power demand difference value in the power consumption area, judging whether the power demand area is marked according to the power demand score of the next power consumption judging period, marking the power demand area, and continuing to carry out power supply capacity judgment in the power consumption area which does not need to be regulated, so that the power grid is ensured to be in a normal running state.
Referring to fig. 4, fig. 4 is a flowchart of determining whether the power-on area can smoothly enter the area for energy storage and power supply according to any power-on area of the present embodiment.
Specifically, in the embodiment, in step S5, for any power-required area, whether the power-required area can smoothly enter the area for energy storage and power supply is determined according to the analog value of the pre-power-required amount of the power-required area;
for any electricity utilization area, a discharge threshold value is stored in the electricity storage unit, wherein the discharge threshold value is related to an electricity storage value stored in the electricity storage unit in the electricity utilization area, and a fixed proportion parameter is stored in the electricity storage unit;
when the analog value of the pre-needed electric quantity is larger than the discharge threshold value, entering into the evaluation and judgment of energy storage and power supply in different areas;
and when the analog value of the pre-needed electric quantity is smaller than or equal to the discharge threshold value, the power is supplied to the energy storage of the area of the power storage unit.
The electricity storage unit is internally provided with a discharge threshold Fd1, the regional electricity consumption threshold Fd1 is related to the electricity storage value D1=760 kilowatt hour stored in the electricity storage unit in the electricity consumption region A1, and a fixed proportion parameter D is stored in the electricity storage unit.
Discharge threshold Fd1:
fd1=d1×d/4=760×0.7/4=133 kilowatt-hours;
wherein Fd1 is the discharge threshold value of the electricity consumption area A1 of the second electricity consumption judging period of 3 months in 2020, and the unit is kilowatt-hour;
d1 is the value of the stored electricity in the electricity storage unit of the electricity utilization area A1, and the unit is thousands of watt-hours;
d is a fixed proportion parameter of the electricity storage unit of the electricity utilization area A1, which is a fixed value d=0.7, and is related to the maximum electricity consumption value of the electricity storage unit, and the rest is emergency electricity quantity.
When the analog value M1 of the pre-needed electric quantity is larger than the discharge threshold Fd1, entering into different-area energy storage and power supply evaluation judgment;
when the analog value M1 of the electricity demand is smaller than or equal to the discharge threshold Fd1, the electricity enters the area of the electricity storage unit to store energy and supply power.
According to the invention, the power-requiring area is screened according to the power supply fault evaluation value, the energy storage power supply in the area can be accessed, the proper mode of the energy storage power supply in the area is determined, the loss caused by the power supply in different places is reduced for the preferential local energy storage power supply, meanwhile, the range of the energy storage power supply is limited, the emergency electric quantity stored in the power storage unit is ensured, and the power-off loss caused by the sudden fault of the power grid is prevented.
Specifically, in this embodiment, in step S6, all the power supply areas are summarized and the available power amount of the power storage unit of each power supply area is calculated, where the available power amount is related to the available power storage amount of each power supply area, and the available power amount and the stored power amount of the power storage unit store a fixed available power ratio parameter.
According to the invention, the available power quantity of the power storage units of the power supply areas is calculated, the available power quantity of each power supply area is summarized, the next step of evaluation and judgment of different-area energy storage power supply is conveniently carried out, meanwhile, the fixed transportable proportion parameters are set to protect the transported electric quantity value of the area transporting different-area power supply, and the normal operation of the power supply areas can be ensured due to different-area power supply.
Specifically, in this embodiment, when determining whether any power supply area can supply power to the power supply area in different areas, there are a distance estimation parameter and an electric quantity estimation parameter in any power supply area, where the distance estimation parameter is inversely proportional to the distance between the power supply area and the power supply area, and the electric quantity estimation parameter is directly proportional to the available power of each power supply area.
Specifically, in this embodiment, in step S6, for any power-required area that enters the evaluation determination of the power supply of the energy storage of the different area, a different area power supply module is stored in the area power consumption monitoring unit of the power-required area, and according to the distance between any power-required area and each power supply area and the power-available amount of each power supply area, the different area power-storage power-supply score value is calculated, and compared with the different area power-storage power-supply score threshold stored in the different area power supply module, to determine whether any power supply area can perform different area power supply on the power-required area;
if the grading value of the energy storage power supply in the different area is larger than or equal to the grading threshold value of the energy storage power supply in the different area, reserving the power supply area, and judging the power supply in the different area of the next power supply area;
if the different-area energy storage power supply scoring value is smaller than the different-area energy storage power supply scoring threshold value, deleting the power supply area, and judging different-area power supply of the next power supply area;
and (3) sorting the different-area power supply judgment of all the power supply areas until the different-area power supply judgment of all the power supply areas is completed, and selecting the power supply area with the largest different-area energy storage power supply grading value to supply power.
If the electricity consumption area A1 is an electricity demand area, the electricity consumption area A2 is a power supply area.
Different-area energy storage and power supply scoring value Yq1:
Yq1＝Q2×q2+L21×a21；
wherein Yq1 is the grading value of the power consumption area A2 to the energy storage and power supply of the different areas of the power consumption area A1;
q2 is the value of the power available in the power utilization area A2, and is ten thousand watts;
l21 is the distance from the electricity utilization area A2 to the electricity utilization area A1, km;
q2 is a power consumption evaluation parameter of the power consumption area A2, which is related to the power-able value Q2 of the power consumption area A2, and the larger the power-able value Q2 of the power consumption area A2 is, the larger the power consumption evaluation parameter Q2 of the power consumption area A2 is, in units of
a21 is a distance estimation parameter of the electricity consumption region A2, which is related to the distance L21 from the electricity consumption region A2 to the electricity consumption region A1, and the smaller the distance L21 from the electricity consumption region A2 to the electricity consumption region A1 is, the larger the distance estimation parameter a21 of the electricity consumption region A2 is, in units of
If the abnormal region energy storage power supply grading value Yq1 is larger than or equal to the abnormal region energy storage power supply grading threshold Yq0, reserving the power supply region, and judging abnormal region power supply of the next power supply region; if the different-area energy storage power supply scoring value Yq1 is smaller than the different-area energy storage power supply scoring threshold value Yq0, deleting the power supply area, and judging different-area power supply of the next power supply area; and (3) sorting the different-area power supply judgment of all the power supply areas until the different-area power supply judgment of all the power supply areas is completed, and selecting the power supply area with the largest different-area energy storage power supply grading value to supply power.
According to the invention, by calculating the differential area energy storage power supply grading value of the power supply area power storage unit, whether the power supply area meets the requirements of differential area energy storage power supply is judged, unnecessary power transmission loss in the differential area power supply process is reduced, and meanwhile, the power demand area and the power supply area are ensured to be in a good state of interconnection and mutual power supply.
Specifically, in this embodiment, the actual received power of the power-required area is monitored in real time, and the actual received power is calculated and counted in the power supply module of the different area, so as to determine when the power supply of the different area is stopped;
if the actual received electric quantity is smaller than the analog value of the pre-required electric quantity in the power-required area, different-area power supply of the next ordered power supply area is performed until the actual received electric quantity is equal to the analog value of the pre-required electric quantity in the power-required area;
if the actual received electric quantity is equal to the analog value of the pre-required electric quantity of the power-required area, the power supply in the different areas of the power supply area is stopped, and the operation judgment of the next power utilization judgment period of the power-required area is performed.
If the actual received electric quantity Sq1 is smaller than the analog value M1 of the pre-required electric quantity in the power-required area, different-area power supply of the next ordered power supply area is performed until the actual received electric quantity is equal to the analog value of the pre-required electric quantity in the power-required area; if the actual received power Sq1 is equal to the analog value M1 of the pre-required power in the power-required area, the power supply in the different area of the power supply area is stopped, and the operation judgment of the next power utilization judgment period in the power-required area is entered.
The invention monitors the received electric quantity of the electric-demand area in real time, prevents excessive electric energy from being lost in the process of supplying power to different areas, provides enough electric quantity for the electric-demand area, and can not support the operation of the electric-demand area.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A power distribution area flexible interconnection fault rapid power transfer control method is characterized by comprising the following steps of,
step S1, dividing a power distribution area into a plurality of power utilization areas, and adjusting the electric quantity distribution value of a total power supply end of the power distribution area aiming at the power utilization areas to a corresponding value according to the historical power utilization condition of any power utilization area;
step S2, for a single power utilization area, according to the actual power utilization condition in the historical power supply period of the power utilization area, the power utilization condition of the power utilization area in the next power utilization judgment period is calculated through simulation in a pre-power demand model;
step S3, screening and marking a power supply area according to the simulated power demand condition of the single power utilization area, and determining whether to enter power supply fault estimation judgment;
step S4, screening and marking the power-required area for any power-used area entering power supply fault prediction judgment, and determining the power-used area for carrying out regional energy storage and power supply;
step S5, judging a power supply mode finally entered into any power demand area according to a pre-power demand analog value of the power demand area, wherein the power supply mode comprises regional energy storage power supply and different regional energy storage power supply;
step S6, carrying out different-region electricity supplementing evaluation on any electricity-required region which does not accord with the regional energy storage and power supply condition, and determining one or a plurality of regions of different-region electricity supplementing to supply power to the electricity-used region;
in step S1, in the process of distributing regional power at the total power supply end of the power distribution station, distributing corresponding regional power at the total power supply end of the power distribution station according to historical power consumption conditions in the same cycle and the cycle;
for any power utilization area, the same-ratio period and the ring-ratio period exist at the total power supply end of the power distribution area, and the power distribution value of the total power supply end of the power distribution area for the power utilization area is determined according to the power utilization trend of the same-ratio period and the ring-ratio period;
in step S2, a power storage unit and a regional power consumption monitoring unit are stored in any power consumption region, where the power storage unit is used to store the residual power of the power consumption region in any power consumption period and record the actual power consumption situation of the power consumption region;
for any electricity utilization area, a pre-electricity consumption model is stored in the electricity storage unit, an electricity utilization judging period is stored in the pre-electricity consumption model, the actual electricity consumption is calculated according to the actual electricity consumption of the starting day and the actual electricity consumption of the ending day of the electricity utilization judging period, the pre-electricity consumption simulation of the next electricity utilization judging period is carried out on the actual electricity consumption in the pre-electricity consumption model, a pre-electricity consumption simulation value is calculated, and the electricity utilization condition of the electricity utilization area in the next electricity utilization judging period is judged in the area electricity utilization monitoring unit according to the size of the pre-electricity consumption simulation value;
in step S3, for any power utilization area, there is an area power utilization threshold in the area power utilization monitoring unit, which is the maximum power utilization amount in one power utilization judging period of the power utilization area;
when the analog value of the pre-needed electric quantity is larger than the regional power consumption threshold value, the power consumption region enters power supply fault estimation judgment;
when the analog value of the pre-needed electric quantity is smaller than or equal to the regional power consumption threshold value, continuing to judge the electric quantity needed condition of the next power consumption judging period, and marking the power consumption region as a power supply region;
in step S4, for any power utilization area, calculating a power supply failure evaluation value according to a power demand difference value between a power demand analog value and an area power consumption threshold value, and performing pre-estimation judgment on a power supply failure condition of the power utilization area;
for any electricity utilization area, a power supply fault evaluation threshold value and an evaluation parameter are stored in an area electricity utilization monitoring unit, and the evaluation parameter is in direct proportion to a power demand difference value;
if the power supply fault evaluation value is greater than or equal to the power supply fault evaluation threshold value, marking the power utilization area as a power demand area, and entering an area energy storage power supply judgment;
if the power supply fault evaluation value is smaller than the power supply fault evaluation threshold value, continuing to judge the power supply capacity of the power utilization area, and judging that the power utilization area stores energy in a region for power supply in the next power utilization judging period;
in step S5, for any power-requiring area, determining whether it can smoothly enter the area for energy storage and power supply according to the analog value of the pre-power-requiring amount of the power-requiring area;
for any electricity utilization area, a discharge threshold value is stored in the electricity storage unit, wherein the discharge threshold value is related to an electricity storage value stored in the electricity storage unit in the electricity utilization area, and a fixed proportion parameter is stored in the electricity storage unit;
when the analog value of the pre-needed electric quantity is larger than the discharge threshold value, entering into the evaluation and judgment of energy storage and power supply in different areas;
when the analog value of the pre-needed electric quantity is smaller than or equal to the discharge threshold value, the power is supplied to the energy storage of the area of the power storage unit;
in step S6, summarizing all the power supply areas and calculating the power available quantity of the power storage unit of each power supply area, wherein the power available quantity is related to the power available quantity of the power supply areas, and the power available quantity and the power storage quantity of the power storage unit store fixed power available proportion parameters;
in step S6, for any power-requiring area entering the evaluation and determination of power supply of different area energy storage, a power-supplying module of different area is stored in the area power-consuming monitoring unit of the power-consuming area, and calculates the power-supplying score of different area energy storage according to the distance between any power-requiring area and each power-supplying area and the power-supplying quantity of each power-supplying area, compares the power-supplying score with the power-supplying score threshold of different area energy storage stored in the power-supplying module of different area, and determines whether any power-supplying area can perform different area power supply for the power-requiring area;
if the grading value of the energy storage power supply in the different area is larger than or equal to the grading threshold value of the energy storage power supply in the different area, reserving the power supply area, and judging the power supply in the different area of the next power supply area;
if the different-area energy storage power supply scoring value is smaller than the different-area energy storage power supply scoring threshold value, deleting the power supply area, and judging different-area power supply of the next power supply area;
and (3) sorting the different-area power supply judgment of all the power supply areas until the different-area power supply judgment of all the power supply areas is completed, and selecting the power supply area with the largest different-area energy storage power supply grading value to supply power.
2. The method for rapid power transfer control of flexible interconnection faults in a power distribution area according to claim 1, wherein when judging whether any power supply area can supply power to different areas of the power demand area, a distance evaluation parameter and a power evaluation parameter are stored in any power demand area, the distance evaluation parameter is inversely proportional to the distance between the power demand area and the power supply area, and the power evaluation parameter is directly proportional to the available power of each power supply area.
3. The method for controlling the rapid power transfer of the flexible interconnection fault of the power distribution station according to claim 1, wherein the actual received power of the power demand area is monitored in real time, and the actual received power is calculated and counted in a power supply module of the different area to judge when the power supply of the different area is stopped;
if the actual received electric quantity is smaller than the analog value of the pre-required electric quantity in the power-required area, different-area power supply of the next ordered power supply area is performed until the actual received electric quantity is equal to the analog value of the pre-required electric quantity in the power-required area;
if the actual received electric quantity is equal to the analog value of the pre-required electric quantity of the power-required area, the power supply in the different areas of the power supply area is stopped, and the operation judgment of the next power utilization judgment period of the power-required area is performed.
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