CN116979527A - Micro-grid control method and device, nonvolatile storage medium and electronic equipment - Google Patents
Micro-grid control method and device, nonvolatile storage medium and electronic equipment Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims description 86
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- 230000002441 reversible effect Effects 0.000 claims description 29
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- 230000002829 reductive effect Effects 0.000 claims description 8
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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 discloses a micro-grid control method and device, a nonvolatile storage medium and electronic equipment. Wherein the method comprises the following steps: determining control response time length of the micro-grid and input power variation generated by the power grid on the micro-grid within the control response time length, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; determining a first power threshold representing a lower limit of input power of the grid to the micro-grid based on the input power variation; detecting the current input power of a power grid at the current moment; and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid. The invention solves the technical problem that the micro-grid supplies power to the power grid reversely in the waiting control response process in the related technology.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a micro-grid control method and device, a nonvolatile storage medium and electronic equipment.
Background
After the micro-grid is connected into the power grid in a large scale, when the new energy system in the micro-grid generates excessive power, the problem of reverse power supply, namely reverse flow, can occur. Meanwhile, the electric power in the micro-grid is sent into the power grid, so that not only can the electric energy quality be reduced, but also the hidden danger of electric faults can be generated. To prevent these problems, the supply of electricity to the grid is often prohibited or limited, thereby protecting the grid. In the related art, grading is carried out according to the magnitude of the sudden load drop, so that the control response speed is improved, and the photovoltaic anti-reflux control is realized. In the related art, various energy regulation and control possibly included in the new energy system are not considered, and the adaptation to the control response speed is different, so that the grid-connected point power of the power grid and the micro-grid cannot be accurately set, and the problem of reverse power supply to the power grid can occur under the condition that the micro-grid waits for the control response.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a micro-grid control method, a micro-grid control device, a nonvolatile storage medium and electronic equipment, which are used for at least solving the technical problem that the micro-grid supplies power to a power grid in a reverse direction in the waiting control response process in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a micro-grid control method, including: determining control response time length of a micro-grid and input power variation generated by a power grid on the micro-grid within the control response time length, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; determining a first power threshold representing a lower limit of input power of the grid to the microgrid based on the input power variation; detecting the current input power of the power grid at the current moment; and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
Optionally, the new energy system includes an energy storage battery unit, and the controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid prohibits reverse power supply to the power grid includes: detecting the state of charge of the energy storage battery unit under the condition that a first power difference value between the current input power and the first power threshold is smaller than a set value; determining a current battery discharge power of the energy storage battery unit at the current moment in case the state of charge does not reach a predetermined electrical quantity threshold; determining the charge-discharge power variation of the energy storage battery unit converted from the current battery discharge power to a preset maximum charge power; and controlling the current battery discharging power of the energy storage battery unit to reduce the first power difference value under the condition that the charge-discharge power variation is larger than or equal to the first power difference value.
Optionally, the new energy system includes a photovoltaic power generation unit, and the method further includes: determining a second power difference value between the first power difference value and the charge-discharge power variation value under the condition that the charge-discharge power variation value is smaller than the first power difference value; determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment; and controlling the current battery discharge power to reduce the charge-discharge power variation, and controlling the current photovoltaic discharge power to reduce the second power difference value.
Optionally, the new energy system includes a photovoltaic power generation unit, and the method further includes: determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment; and under the condition that the state of charge reaches the electric quantity threshold value, controlling the energy storage battery unit to stop discharging, and controlling the current photovoltaic discharging power to reduce the first power difference value.
Optionally, the new energy system includes an energy storage battery unit and a photovoltaic power generation unit, and the control of the new energy system based on the current input power and the first power threshold value makes the micro-grid inhibit reverse power supply to the power grid, including: determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment and the preset maximum photovoltaic discharge power of the photovoltaic power generation unit under the condition that the first power difference value between the current input power and the first power threshold is larger than a set value; determining a third power difference between the current photovoltaic discharge power and the maximum photovoltaic discharge power; determining the smallest of the first power difference and the third power difference as a photovoltaic power increment; controlling the current photovoltaic discharge power of the photovoltaic power generation unit to increase the photovoltaic power increment; and controlling the energy storage battery unit to charge by adopting the maximum battery charging power under the condition that the current moment is in a preset electricity price valley time period.
Optionally, the method further comprises: determining the maximum battery discharge power of the energy storage battery unit under the condition that the current moment is in a preset electricity price peak value time period; controlling the energy storage battery unit to discharge by adopting the maximum battery discharge power under the condition that the first power difference value is larger than the maximum battery discharge power; and controlling the current battery discharge power of the energy storage battery unit to be reduced by the first power difference value under the condition that the first power difference value is smaller than the maximum battery discharge power.
Optionally, the method further comprises: detecting the state of charge of the energy storage battery unit at the current moment; and determining the maximum battery charging power and the maximum battery discharging power of the energy storage battery unit based on the state of charge.
According to another aspect of the embodiment of the present invention, there is provided a micro-grid control device, including: the first determining module is used for determining control response time of the micro-grid and input power variation generated by the power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; a second determining module, configured to determine, based on the input power variation, a first power threshold value representing a lower limit of input power of the power grid to the micro-grid; the detection module is used for detecting the current input power of the power grid at the current moment; and the control module is used for controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
According to another aspect of embodiments of the present invention, there is provided a non-volatile storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform any one of the micro-grid control methods.
According to another aspect of an embodiment of the present invention, there is provided an electronic apparatus including: one or more processors and a memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of microgrid control of any of the claims.
In the embodiment of the invention, a control response time length of a micro-grid and an input power variation generated by a power grid on the micro-grid within the control response time length are determined, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; determining a first power threshold representing a lower limit of input power of the grid to the microgrid based on the input power variation; detecting the current input power of the power grid at the current moment; and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid. The method achieves the aim of avoiding reverse power supply to the power grid, achieves the technical effect that the micro-grid controller has enough time to finish regulation and control processing, and further solves the technical problem that the micro-grid supplies power reversely to the power grid in the waiting control response process in the related technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a flowchart of an alternative micro-grid control method provided according to an embodiment of the present application;
fig. 2 is a schematic flow chart of an alternative micro-grid control method according to an embodiment of the present application;
fig. 3 is a schematic diagram of an alternative micro-grid control device according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Micro-grid is a concept of a traditional large power grid, namely a network formed by a plurality of distributed power supplies and related loads according to a certain topological structure, and the network is related to the traditional power grid through static switches. The system is a self-control, protection and management autonomous system, can operate in parallel with an external power grid or in isolation, and is an important component of the power grid.
The anti-countercurrent of the micro-grid and the power grid refers to the problem of power grid operation fluctuation caused by current reverse flow to the power grid when the power supply capacity of the micro-grid or the power grid exceeds the load demand in a distributed energy system such as new energy power generation. The regulation of the micro-network is limited by infrastructure and needs to rely on various devices and control systems, and the devices and systems may have a certain response time delay, such as response time of the sensor and the execution device, transmission delay of the communication network, and the like, which cause delay of regulation. And in order to ensure stable operation and reliability of the system, the control strategy for regulation includes some protection mechanisms and limiting conditions, and these mechanisms and conditions may require some time for judgment and execution. In the related art, under the condition that the application of a specific micro-grid is not considered, the control response time of the micro-grid is not taken as a part of a control strategy, and the problem of reverse power supply to the power grid in the micro-grid regulation and control process is difficult to avoid.
In view of the foregoing, embodiments of the present invention provide a method embodiment for microgrid control, it should be noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
Fig. 1 is a flowchart of a method for controlling a micro network according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps, where an execution body is a micro network controller:
step S102, determining control response time of a micro-grid and input power variation generated by a power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load;
it can be understood that the micro-grid controller can acquire control response time of the micro-grid, the micro-grid comprises a new energy system and an electric load, when the grid-connected point power between the micro-grid and the power grid is regulated, the power regulation is not completed immediately, and in the control response time, the power change of the power grid to the micro-grid may have a countercurrent problem, so that the input power change quantity generated by the power grid in the control response time needs to be determined, and the degree to which the power changes in the regulation process is represented.
It should be noted that, whether the grid-connected power of the power grid to the micro-grid is in an input state depends on the requirement of the power load in the micro-grid and the power supply capability of the new energy system, the new energy system is matched with the power grid to realize the power supply to the power load, wherein only the new energy system is controlled by the micro-grid controller, and the power load is determined by the requirement of a user and is not controlled by the micro-grid controller. The power grid is not controlled by the micro-grid controller, but is powered according to the power load and the energy gap generated by the new energy system.
Alternatively, the input power variation may be obtained in a predetermined history period, in which multiple adjustments may occur, and thus multiple historic power variations may occur. Based on the plurality of historical power variations, a maximum value is obtained. And determining the input power variation by statistical means such as mode, average number and the like.
Optionally, the new energy system may include various systems, for example: the energy storage battery unit and the photovoltaic power generation unit, and the wind power generation unit.
Optionally, the micro-grid controller adopts an ARM-53 processor.
Step S104, determining a first power threshold value representing the lower limit of the input power of the power grid to the micro-grid based on the input power variation;
it will be appreciated that, based on the above-described input power variation, a first power threshold representing a lower input power limit of the power grid may be determined according to the factor of the control response duration of the micro-grid. In the related art, a '0' is often adopted as a regulated power threshold, and the actual input power of the power grid to the micro-grid is smaller than 0, namely reverse power supply occurs. The control response time length and the influence of the input power variation amount on whether reverse power supply occurs are not considered, and compared with the control response time length and the influence of the input power variation amount on whether reverse power supply occurs, the first power threshold determined by the embodiment can more effectively avoid the occurrence of the problem of reverse power supply.
Step S106, detecting the current input power of the power grid at the current moment;
it can be appreciated that the microgrid controller can detect a grid-connected state and determine the current input power of the power grid at the current moment. Once the current input power is smaller than the first power threshold, even if the current input power is not smaller than 0, the micro-grid controller is required to regulate and control, and therefore the actual occurrence of the reverse power supply problem is avoided.
And step S108, controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
It can be understood that the current input power reflects the real-time state of the power grid to the micro-grid, a control strategy for the new energy system is determined based on the difference between the current input power and the first power threshold, and regulation is implemented by adopting the control strategy, so that the micro-grid is forbidden to supply power to the power grid in the reverse direction.
In an optional embodiment, the new energy system includes an energy storage battery unit, and the controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid prohibits reverse power supply to the power grid includes: detecting the state of charge of the energy storage battery unit under the condition that a first power difference value between the current input power and the first power threshold is smaller than a set value; determining a current battery discharge power of the energy storage battery unit at the current time under the condition that the state of charge does not reach a preset electric quantity threshold value; determining a charge-discharge power variation amount of the energy storage battery unit converted from the current battery discharge power to a preset maximum charge power; and controlling the current battery discharging power of the energy storage battery unit to reduce the first power difference value under the condition that the charge-discharge power variation is larger than or equal to the first power difference value.
It can be understood that, in the case that the new energy system includes an energy storage battery, when the first power difference between the current input power and the first power threshold is smaller than the set value, the energy storage battery unit is preferentially regulated and controlled, because the energy storage battery unit can charge or discharge two running states, when the state of charge of the energy storage battery unit is detected not to reach the electric quantity threshold, the energy storage battery unit is regarded as not being full, and the energy storage battery unit can be used for storing the redundant electric quantity in the micro-grid, so that reverse power supply to the power grid is avoided. The energy storage battery unit is converted from a discharging state to a charging state, and the energy storage battery unit is represented by the charging and discharging power variation quantity converted from the current battery discharging power to the maximum charging power. When the change amount of the charging and discharging power is greater than or equal to the first power difference value (i.e., the power difference value between the current input power and the first power threshold), the energy storage battery unit can be regarded as the energy storage battery unit to consume the redundant electric quantity of the micro-grid by reducing the discharging amount until the charging state, the energy storage unit is controlled to reduce the power from the current battery discharging power, the discharging power is assumed to be positive, the charging power is assumed to be negative, and the reducing size is the first power difference value. Through the processing, under the condition that reverse power supply is possible, the discharging amount of the energy storage battery unit is preferably changed or the charging amount is increased, so that the energy loss in the micro-grid regulation state is reduced, and the effects of peak clipping and valley filling are achieved.
Alternatively, the above set point is typically 0.
In an optional embodiment, the new energy system includes a photovoltaic power generation unit, and the method further includes determining, when the charge-discharge power variation is smaller than the first power difference, a second power difference between the first power difference and the charge-discharge power variation, and determining a current photovoltaic discharge power of the photovoltaic power generation unit at the current time; and controlling the current battery discharge power to reduce the charge-discharge power variation, and controlling the current photovoltaic discharge power to reduce the second power difference.
It can be understood that, under the condition that the charge-discharge power variation is smaller than the first power difference, the energy storage battery unit cannot independently complete the consumption of the redundant electric quantity, and the energy storage battery unit needs to be matched with the photovoltaic power generation unit for regulation. The current battery discharge power of the energy storage battery unit needs to be converted into the maximum charging power, and the energy storage battery unit is controlled to reduce the charging and discharging power variation. And the current photovoltaic discharge power of the photovoltaic power generation unit is reduced by the power of a second power difference value, wherein the second power difference value is the difference value between the first power difference value and the charge-discharge power variation.
Optionally, in the case that the new energy system includes a wind power generation unit, determining a current wind power discharge power of the wind power generation unit at the current time, controlling the current battery discharge power to decrease the charge-discharge power variation amount, and decreasing the current wind power discharge power by the second power difference value. And the current battery discharge power is controlled to reduce the charge-discharge power variation, and the current wind energy discharge power and the current photovoltaic power generation unit jointly reduce the second power difference value under the condition that the new energy system comprises a wind energy power generation unit and a photovoltaic power generation unit.
Optionally, the microgrid controller simultaneously issues control instructions to the photovoltaic power generation unit and the energy storage battery unit without prioritizing the instructions.
In an alternative embodiment, the new energy system includes a photovoltaic power generation unit, and the method further includes: determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment; and under the condition that the state of charge reaches the electric quantity threshold value, controlling the energy storage battery unit to stop discharging, and controlling the current photovoltaic discharging power to reduce the first power difference value.
It can be understood that when the state of charge of the energy storage discharge unit is detected to reach the electric quantity threshold, the electric quantity of the energy storage discharge unit is regarded as full, the charging process cannot be performed, the micro-grid controller is required to control the element of the energy storage battery to stop discharging, the regulation and control process is completed by means of the photovoltaic power generation unit, the current photovoltaic discharge power is controlled to reduce the first power difference value, and the power reduction amount of the photovoltaic power generation unit can meet the power gap of the micro-grid to the power grid.
In an optional embodiment, the new energy system includes an energy storage battery unit and the photovoltaic power generation unit, and the controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid prohibits reverse power supply to the power grid includes: determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment and the preset maximum photovoltaic discharge power of the photovoltaic power generation unit under the condition that the first power difference value between the current input power and the first power threshold is larger than a set value; determining a third power difference between the current photovoltaic discharge power and the maximum photovoltaic discharge power; determining the smallest of the first power difference and the third power difference as a photovoltaic power increment to control the current photovoltaic discharge power increment of the photovoltaic power generation unit; and controlling the energy storage battery unit to charge by adopting the maximum battery charging power under the condition that the current moment is in the preset electricity price valley time period.
It can be understood that the new energy system includes an energy storage battery unit and the photovoltaic power generation unit, when the first power difference between the current input power and the first power threshold is greater than the set value, the current discharge power of the photovoltaic power generation unit is considered to be temporarily not in a reverse power supply problem, the current discharge power of the photovoltaic power generation unit can be properly increased, and the increased power can be the smallest photovoltaic power increment between the first power difference and the third power difference, wherein the third power difference is the difference between the current photovoltaic discharge power and the maximum photovoltaic discharge power. In order to improve the utilization of energy sources in the micro-grid and reduce the energy cost as much as possible, whether the current moment is in the electricity price valley time period or not is determined according to the electricity price change rule in the power grid, and the energy storage battery unit is controlled to charge by adopting the maximum battery charging power in the electricity price valley time period, so that the energy storage battery unit has the energy storage cost as low as possible.
In an alternative embodiment, the method further comprises: determining the maximum battery discharge power of the energy storage battery unit under the condition that the current moment is in a preset electricity price peak value time period; controlling the energy storage battery unit to discharge by adopting the maximum battery discharge power under the condition that the first power difference value is larger than the maximum battery discharge power; and controlling the current battery discharge power of the energy storage battery unit to reduce the first power difference value under the condition that the first power difference value is smaller than the maximum battery discharge power.
It can be understood that under the condition that the current moment is at the peak value of electricity, the power supply cost of the power grid is higher, the new energy system is required to be used as much as possible for supplying power, and under the condition that the power supply capacity of the maximum battery discharge power is insufficient to cover the first power difference value, the problem that the micro-grid is reversely supplied is not directly caused even if the energy storage battery is supplied with the maximum discharge power. In the case where the maximum battery discharge power is greater than the first power difference, it is considered that the use of the maximum battery reverse power supply causes a reverse power supply problem, and the current battery discharge power needs to be reduced by the first power difference.
The peak-average value of electricity price is understood to be the peak value and the average value, and is distinguished from the low-valley value of electricity price.
In an alternative embodiment, the method further comprises: detecting the state of charge of the energy storage battery unit at the current moment; and determining the maximum battery charging power and the maximum battery discharging power of the energy storage battery unit based on the state of charge.
It can be understood that the maximum battery charging power and the maximum battery discharging power of the energy storage battery unit are not fixed values, and can change according to the state of charge, because of the battery characteristics, at the end of charging and discharging, low-power charging and discharging are needed, so that the problem of overcharge and overdischarge is avoided.
Through the steps S102 to S108, the purpose of avoiding reverse power supply to the power grid can be achieved, the technical effect that the micro-grid controller has enough time to complete regulation and control processing is achieved, and the technical problem that the micro-grid supplies reverse power to the power grid in the waiting control response process in the related technology is solved.
Based on the above embodiment and the optional embodiment, the invention provides an optional implementation mode, wherein the micro-grid consists of a photovoltaic power generation unit, an energy storage battery unit and an electric load in a preset park, and the power grid and the micro-grid supply power interactively. The photovoltaic power generation unit plays a role in generating electricity to provide electric energy for park electricity loads, the energy storage battery unit is charged when electricity price is in a valley value or photovoltaic power generation cannot be completely consumed by the loads, then electricity consumption cost is reduced in an electricity price peak value period, and the power grid automatically supplements insufficient electric energy through a park grid-connected point (a connection point of the micro-grid and the power grid) according to the running condition of the micro-grid. The micro-grid controller is used for regulating and controlling the micro-grid to avoid the micro-grid from reversely supplying power to the power grid ground, and the micro-grid controller collects the photovoltaic power generation unit, the energy storage battery unit, the power load and the grid-connected power (namely the current input power) in the micro-grid; setting minimum input power Rp (namely a first power threshold) of a grid connection point in a micro-grid controller, ensuring that the current input power P of a power grid is always higher than the first power threshold Rp, and reserving enough space and time for preventing the micro-grid from reversely transmitting power to the power grid to perform regulation and control treatment.
Under the condition of stable operation of the micro-grid, the first power threshold Rp is required to be ensured to be less than or equal to the current input power P=P Negative pole - P Storage device - P Light source Wherein P is Negative pole For the power consumption of the electric load, P Light source Current photovoltaic discharge power, P, for photovoltaic power generation Storage device The current battery discharge power (here, the stored energy discharge is set to be positive and the charge is set to be negative).
Fig. 2 is a schematic flow chart of an alternative micro-grid control method according to an embodiment of the present invention, where a micro-grid appears P Negative pole Lowering, P Light source Or P Storage device When the current input power P decreases and reaches the first power threshold Rp in case of increase, etc., to avoid P<And 0 (namely, the grid connection point of the micro-grid reversely transmits power to the power grid), and the micro-grid controller controls the photovoltaic power generation unit to carry out methods of power reduction, energy storage charging or load improvement and the like in real time, so that the current input power P is stabilized above a first power threshold Rp. The method comprises the following specific steps:
step S1, determining the current photovoltaic discharge power P by the micro-grid controller Light source Photovoltaic maximum discharge power P of photovoltaic power generation unit Optical max Current battery discharge power P of energy storage battery cell Storage device Maximum battery discharge power P Store max Maximum battery charge power P Store min Power P for power load Negative pole And the current input power P of the grid to the microgrid.
Step S2, setting a first power threshold Rp (Rp>0），P =（P Negative pole - P Light source -P Storage device ) And (5) the first power threshold Rp is not less than. By measuring the micro-net in the fieldThe controller controls the control response time required by the photovoltaic execution to finish the power-down instruction to be T1, the micro-grid controls the statistics historical data, and the maximum power reduction value in the time T1 is obtained as the lowest input power and is used as the first power threshold Rp.
Step S3, if P-Rp is less than 0 and the state of charge SOC of the energy storage battery unit<100%, the charge and discharge power variation of the energy storage battery is recorded as P L storage ，P L storage = P Storage device -P Store min Then further judging again if P L storage The micro-grid controller issues control command to reduce the power of the energy storage battery unit to Rp-P (discharge is reduced or converted to charge, and the charge power is represented as negative value).
Conversely if P L storage If Rp-P is less than or equal to, the micro-grid controller gives a control instruction to reduce the current battery discharge power of the energy storage battery unit by P Storage device = P L storage And the power reduction amount of the photovoltaic power generation unit is Rp-P L storage ；
Step S4, if P-Rp is less than 0 and the state of charge SOC of the energy storage battery is equal to 100%, the energy storage battery is standby, and meanwhile, the micro-grid controller issues a control instruction to enable the power reduction amount of the photovoltaic power generation unit to be Rp-P;
Step S5, if P-Rp>0, the current photovoltaic power generation power of the photovoltaic power generation unit is increasedAnd the current time period is positioned in the electricity price low-valley time period, and the energy storage battery unit is in a state of P Store min And (5) charging. At this time, whether the photovoltaic power generation unit has discharge allowance or not needs to be ensured, and in order to avoid photovoltaic power loss, the photovoltaic power generation unit is ensured to discharge with higher power, thereby ensuring lower energy cost.
If the current period is in the battery peak-to-average period and (P-Rp) > maximum battery discharge power P Store max The energy storage battery unit uses the maximum battery discharge power P Store max Discharging, otherwise if (P-Rp) is less than or equal to the current maximum discharge power P Store max The current battery discharge power reduction of the energy storage battery unit is P-Rp.
At least the following effects are achieved by the above alternative embodiments: the invention has the technical effects that: the photovoltaic and the energy storage are used as a regulating and controlling means for preventing countercurrent, and the energy storage is used as a regulating and controlling means preferentially, so that the photovoltaic can be discharged with the maximum power as much as possible, and meanwhile, the photovoltaic power generation can be absorbed by the micro-grid, thereby realizing the maximization of new energy benefit and improving the energy utilization rate. The system fully plays the role of an energy storage system, and the energy storage is used as a chargeable and dischargeable flexible load in the micro-grid, so that the system not only can play a role in peak clipping and valley filling, but also can realize the anti-countercurrent function by changing grid-connected point power through charging and discharging. Through closed loop control, the function of preventing countercurrent is realized, the photovoltaic power generation unit and the energy storage battery unit are regulated, the power of the grid-connected point is stabilized above a first power threshold value, and the system regulation has enough time, so that the function of preventing countercurrent can be effectively realized.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
In this embodiment, a micro-grid control device is further provided, and the micro-grid control device is used to implement the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the terms "module," "apparatus" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
According to an embodiment of the present invention, there is further provided an embodiment of an apparatus for implementing a micro-grid control method, and fig. 3 is a schematic diagram of a micro-grid control apparatus according to an embodiment of the present invention, as shown in fig. 3, where the micro-grid control apparatus includes: the first determining module 302, the second determining module 304, the detecting module 306, the control module 308, the apparatus will be described below.
The first determining module 302 is configured to determine a control response duration of a micro-grid, and an input power variation generated by a power grid on the micro-grid within the control response duration, where the micro-grid includes a new energy system and an electrical load, and the new energy system cooperates with the power grid to supply power to the electrical load;
a second determining module 304, coupled to the first determining module 302, for determining a first power threshold value representing a lower limit of the input power of the power grid to the micro-grid based on the input power variation;
the detection module 306 is connected to the second determination module 304, and is configured to detect a current input power of the power grid at a current time;
the control module 308 is connected to the detection module 306, and is configured to control the new energy system based on the current input power and the first power threshold, so that the micro-grid is prohibited from supplying power to the power grid in a reverse direction.
In the micro-grid control device provided by the embodiment of the invention, a first determining module 302 is used for determining the control response time of a micro-grid and the input power variation generated by a power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; a second determining module 304, coupled to the first determining module 302, for determining a first power threshold value representing a lower limit of the input power of the power grid to the micro-grid based on the input power variation; the detection module 306 is connected to the second determination module 304, and is configured to detect a current input power of the power grid at a current time; the control module 308 is connected to the detection module 306, and is configured to control the new energy system based on the current input power and the first power threshold, so that the micro-grid is prohibited from supplying power to the power grid in a reverse direction. The method achieves the aim of avoiding reverse power supply to the power grid, achieves the technical effect that the micro-grid controller has enough time to finish regulation and control processing, and further solves the technical problem that the micro-grid supplies power reversely to the power grid in the waiting control response process in the related technology.
It should be noted that each of the above modules may be implemented by software or hardware, for example, in the latter case, it may be implemented by: the above modules may be located in the same processor; alternatively, the various modules described above may be located in different processors in any combination.
It should be noted that, the first determining module 302, the second determining module 304, the detecting module 306, and the control module 308 correspond to the steps S102 to S108 in the embodiment, and the modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the embodiment. It should be noted that the above modules may be run in a computer terminal as part of the apparatus.
It should be noted that, the optional or preferred implementation manner of this embodiment may be referred to the related description in the embodiment, and will not be repeated herein.
The micro network control device may further include a processor and a memory, where the first determining module 302, the second determining module 304, the detecting module 306, the control module 308, and the like are stored as program units, and the processor executes the program units stored in the memory to implement corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel may be provided with one or more. The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the invention provides a nonvolatile storage medium, on which a program is stored, which when executed by a processor, implements a micro-grid control method.
The embodiment of the invention provides an electronic device, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the following steps are realized when the processor executes the program: determining control response time of a micro-grid and input power variation generated by a power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; determining a first power threshold representing a lower limit of input power of the grid to the microgrid based on the input power variation; detecting the current input power of the power grid at the current moment; and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid. The device herein may be a server, a PC, etc.
The invention also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with the method steps of: determining control response time of a micro-grid and input power variation generated by a power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load; determining a first power threshold representing a lower limit of input power of the grid to the microgrid based on the input power variation; detecting the current input power of the power grid at the current moment; and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.
Claims (10)
1. A micro-grid control method, comprising:
determining control response time length of a micro-grid and input power variation generated by a power grid on the micro-grid within the control response time length, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load;
determining a first power threshold representing a lower limit of input power of the grid to the microgrid based on the input power variation;
detecting the current input power of the power grid at the current moment;
and controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
2. The method of claim 1, wherein the new energy system comprises an energy storage battery unit, the controlling the new energy system based on the current input power and the first power threshold such that the microgrid inhibits reverse power supply to the power grid comprises:
detecting the state of charge of the energy storage battery unit under the condition that a first power difference value between the current input power and the first power threshold is smaller than a set value;
Determining a current battery discharge power of the energy storage battery unit at the current moment in case the state of charge does not reach a predetermined electrical quantity threshold;
determining the charge-discharge power variation of the energy storage battery unit converted from the current battery discharge power to a preset maximum charge power;
and controlling the current battery discharging power of the energy storage battery unit to reduce the first power difference value under the condition that the charge-discharge power variation is larger than or equal to the first power difference value.
3. The method of claim 2, wherein the new energy system comprises a photovoltaic power generation unit, the method further comprising:
determining a second power difference value between the first power difference value and the charge-discharge power variation value under the condition that the charge-discharge power variation value is smaller than the first power difference value;
determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment;
and controlling the current battery discharge power to reduce the charge-discharge power variation, and controlling the current photovoltaic discharge power to reduce the second power difference value.
4. The method of claim 2, wherein the new energy system comprises a photovoltaic power generation unit, the method further comprising:
Determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment;
and under the condition that the state of charge reaches the electric quantity threshold value, controlling the energy storage battery unit to stop discharging, and controlling the current photovoltaic discharging power to reduce the first power difference value.
5. The method of claim 1, wherein the new energy system comprises an energy storage battery unit and a photovoltaic power generation unit, the controlling the new energy system based on the current input power and the first power threshold such that the microgrid inhibits reverse power supply to the power grid comprises:
determining the current photovoltaic discharge power of the photovoltaic power generation unit at the current moment and the preset maximum photovoltaic discharge power of the photovoltaic power generation unit under the condition that the first power difference value between the current input power and the first power threshold is larger than a set value;
determining a third power difference between the current photovoltaic discharge power and the maximum photovoltaic discharge power;
determining the smallest of the first power difference and the third power difference as a photovoltaic power increment;
controlling the current photovoltaic discharge power of the photovoltaic power generation unit to increase the photovoltaic power increment;
And controlling the energy storage battery unit to charge by adopting the maximum battery charging power under the condition that the current moment is in a preset electricity price valley time period.
6. The method of claim 5, wherein the method further comprises:
determining the maximum battery discharge power of the energy storage battery unit under the condition that the current moment is in a preset electricity price peak value time period;
controlling the energy storage battery unit to discharge by adopting the maximum battery discharge power under the condition that the first power difference value is larger than the maximum battery discharge power;
and controlling the current battery discharge power of the energy storage battery unit to be reduced by the first power difference value under the condition that the first power difference value is smaller than the maximum battery discharge power.
7. The method of claim 6, wherein the method further comprises:
detecting the state of charge of the energy storage battery unit at the current moment;
and determining the maximum battery charging power and the maximum battery discharging power of the energy storage battery unit based on the state of charge.
8. A microgrid control device, characterized by comprising:
the first determining module is used for determining control response time of the micro-grid and input power variation generated by the power grid on the micro-grid within the control response time, wherein the micro-grid comprises a new energy system and an electric load, and the new energy system is matched with the power grid to supply power for the electric load;
A second determining module, configured to determine, based on the input power variation, a first power threshold value representing a lower limit of input power of the power grid to the micro-grid;
the detection module is used for detecting the current input power of the power grid at the current moment;
and the control module is used for controlling the new energy system based on the current input power and the first power threshold value, so that the micro-grid is forbidden to reversely supply power to the power grid.
9. A non-volatile storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to perform the microgrid control method of any one of claims 1 to 7.
10. An electronic device, comprising: one or more processors and a memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the microgrid control method of any of claims 1 to 7.
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