CN113300393B - Direct-current micro-grid battery energy storage energy management method, management equipment and storage medium - Google Patents
Direct-current micro-grid battery energy storage energy management method, management equipment and storage medium Download PDFInfo
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- CN113300393B CN113300393B CN202110537003.9A CN202110537003A CN113300393B CN 113300393 B CN113300393 B CN 113300393B CN 202110537003 A CN202110537003 A CN 202110537003A CN 113300393 B CN113300393 B CN 113300393B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention relates to a battery energy storage management method, management equipment and storage medium of a direct-current micro-grid, which are applied to the direct-current micro-grid, wherein the direct-current micro-grid comprises a grid-connected inverter, a photovoltaic power generation device, a direct-current load and a battery energy storage device, and when the direct-current micro-grid is in a isolated grid state, a first control strategy is executed; when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a second control strategy when the I is larger than or equal to the first fluctuation amplitude threshold value; when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc When the I is smaller than the first fluctuation amplitude threshold value, the third control strategy is executed, and the coordination control requirements of the distributed power interface converter under island and grid-connected operation are considered through the adjustment of the busbar voltage and the energy storage SOC control of the direct-current micro-grid under different operation modes, so that the direct-current micro-grid can keep stable operation even under faults.
Description
Technical Field
The invention relates to the technical field of direct-current micro-grids, in particular to a method for managing energy storage energy of a battery of a direct-current micro-grid, management equipment and a computer readable storage medium.
Background
In recent years, environmental problems have been increasingly focused due to the emission of greenhouse gases and the increase in energy demand, and micro-grids have become sustainable solutions to such problems; the micro-grid has the advantages of low operation cost, high operation efficiency, high electric energy quality and the like; compared with an alternating-current micro-grid, the direct-current micro-grid can effectively integrate a distributed power supply into the grid, so that the direct-current micro-grid is widely researched and focused; in addition, the disadvantages of the ac microgrid, such as complicated active and reactive power control, frequency stability, low efficiency caused by multiple ac-dc conversions, and the like, are not present in the dc microgrid.
In dc micro-grids, the main control objective is to maintain the dc side voltage within an acceptable range; therefore, the direct current micro-grid needs to adopt an effective control method to regulate the direct current voltage in two operation modes of grid connection and island. In the previous research, the focus was to precisely share the power of the distributed power supply and the load; however, if the energy of the battery energy storage device is not properly managed, the battery energy storage device in the dc network is exposed to the risk of deep discharge and overcharge. In addition, the existing direct-current micro-grid energy management method mostly does not consider the transient response problem during grid disturbance, but the voltage regulation of the direct-current grid requires energy storage to participate in system voltage stabilization.
Disclosure of Invention
The invention aims to provide a battery energy storage energy management method, management equipment and a computer readable storage medium for a direct current micro-grid, so that the direct current micro-grid can keep running stably even under faults.
In order to achieve the above object, a first aspect of the present invention provides a method for managing battery energy storage of a dc micro-grid, which is applied to a dc micro-grid, wherein the dc micro-grid includes a grid-connected inverter, a photovoltaic power generation device, a dc load and a battery energy storage device, and the method includes:
executing a first control strategy when the direct current micro-grid is in a isolated grid state;
the first control strategy includes:
s1.1, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if yes, entering a step S1.2; if not, entering a step S1.3;
step S1.2, judging the voltage fluctuation of the direct current busAmplitude DeltaV dc If the voltage is greater than 0, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the If not, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref ；
S1.3, judging whether the SOC is smaller than a first SOC threshold value, if so, carrying out load shedding operation, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref The method comprises the steps of carrying out a first treatment on the surface of the If not, performing power reduction operation on the photovoltaic power generation module to ensure that the photovoltaic power generation module does not operate in an MPPT state, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref 。
Optionally, the load shedding operation includes:
interrupting the load participating in the demand response, judging whether the load capacity meets the load demand after the load terminal, if so, stopping the load throwing operation, and if not, further interrupting the unimportant load.
Optionally, the method further comprises:
when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a second control strategy when the I is larger than or equal to the first fluctuation amplitude threshold value;
the second control strategy includes:
step S2.1, judging absolute value |DeltaV of fluctuation amplitude of DC bus voltage dc Whether the I is larger than a second fluctuation amplitude threshold value or not, if so, controlling the direct current micro-grid to stop temporarily, and restarting the direct current micro-grid after the fault is cleared; if not, entering step S2.2;
s2.2, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if so, entering a step S2.3; if not, not performing any action;
step S2.3, judging the fluctuation amplitude DeltaV of the DC bus voltage dc If the direct current voltage is greater than 0, if so, controlling the direct current voltage of the battery energy storage device to be a command valueSet as a DC voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage charging reference value V chgref 。
Optionally, the first SOC threshold value is 30% and the second SOC threshold value is 90%.
Optionally, the first fluctuation amplitude threshold is 0.09pu; the second fluctuation amplitude threshold is 0.11pu.
Optionally, the method further comprises:
when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a third control strategy when the I is smaller than the first fluctuation amplitude threshold value;
the third control strategy includes:
step S3.1, judging whether the SOC of the battery energy storage device is smaller than a third SOC threshold value, if yes, entering step S3.2; if not, go to step S3.3;
step S3.2, judging absolute value |DeltaV of fluctuation amplitude of DC bus voltage dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref Then judging whether the SOC of the battery energy storage device is smaller than a fourth SOC threshold value, if so, returning to the step S3.2, and if not, not performing any action;
step S3.3, judging whether the SOC of the battery energy storage device is more than 80%, if not, not performing any action; if yes, enter step S3.4;
step S3.4, judging |DeltaV dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage discharge reference value V disref And then judging whether the SOC of the battery energy storage device is larger than a fourth SOC threshold value, if so, returning to the step S3.4, and if not, not performing any action.
Optionally, the third SOC threshold value is 50% and the fourth SOC threshold value is 70%.
Optionally, the first fluctuation amplitude threshold is 0.09pu; the third fluctuation amplitude threshold is 0.03pu.
A second aspect of the present invention proposes a management device comprising: a memory and a processor, the memory having stored therein computer readable instructions that, when executed by the processor, cause the processor to perform the steps of the direct current microgrid battery storage energy management method according to the first aspect.
A third aspect of the invention proposes a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the direct current microgrid battery storage energy management method according to the first aspect.
In summary, the invention provides a direct current micro-grid battery energy storage energy management method, management equipment and a computer readable storage medium, which have at least the following beneficial effects:
compared with the existing energy management strategy, the embodiment of the invention considers the deep discharge and overcharge risks possibly faced by the battery energy storage device, considers the influence of the transient process on the direct current micro-grid system, and supports the grid-connected inverter to control the voltage stability of the direct current micro-grid by utilizing the charge and discharge function of the battery energy storage device.
Additional features and advantages of the invention will be set forth in the description which follows.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for managing energy stored in a battery of a dc micro-grid according to an embodiment of the invention.
Fig. 2 is a control block diagram of the energy storage bidirectional DC/DC converter according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a management device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In addition, numerous specific details are set forth in the following examples in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail in order to not obscure the present invention.
The embodiment of the invention provides a battery energy storage management method of a direct-current micro-grid, which is applied to the direct-current micro-grid, wherein the direct-current micro-grid comprises a grid-connected inverter, a photovoltaic power generation device, a direct-current load and a battery energy storage device; the three modes are based on the running mode of the direct current micro-grid, the SOC level of the battery energy storage device and the voltage fluctuation amplitude delta V of the direct current bus dc Distinguishing;
specifically, the DC bus voltage fluctuation amplitude DeltaV dc Calculated according to the following formula:
wherein V is dcn For DC voltage rating, V dc Is a direct current voltage measurement.
Referring to fig. 1, the method of the embodiment of the invention includes the following steps:
step S1, executing a first control strategy when a direct current micro-grid is in a isolated grid state;
the first control strategy includes:
s1.1, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if yes, entering a step S1.2; if not, entering a step S1.3;
step S1.2, judging the fluctuation amplitude DeltaV of the DC bus voltage dc If the voltage is greater than 0, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the If not, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref ；
S1.3, judging whether the SOC is smaller than a first SOC threshold value, if so, carrying out load shedding operation, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref The method comprises the steps of carrying out a first treatment on the surface of the If not, performing power reduction operation on the photovoltaic power generation module to ensure that the photovoltaic power generation module does not operate in an MPPT state, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref 。
For example, the performing the load dump operation includes:
interrupting the load participating in the demand response, judging whether the load capacity meets the load demand after the load terminal, if so, stopping the load throwing operation, and if not, further interrupting the unimportant load.
Further, referring to fig. 1, the method of the embodiment of the present invention further includes:
step S2, when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a second control strategy when the I is larger than or equal to the first fluctuation amplitude threshold value; the networking state refers to that the direct-current micro-grid is connected with an alternating-current system of the power grid;
the second control strategy includes:
step S2.1, judging absolute value |DeltaV of fluctuation amplitude of DC bus voltage dc Whether the I is larger than a second fluctuation amplitude threshold value or not, if so, controlling the direct current micro-grid to stop temporarily, and restarting the direct current micro-grid after the fault is cleared; if not, entering step S2.2;
s2.2, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if so, entering a step S2.3; if not, not performing any action;
step S2.3, judging the fluctuation amplitude DeltaV of the DC bus voltage dc If the voltage is greater than 0, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage charging reference value V chgref 。
For example, the first SOC threshold value is preferably but not limited to 30% and the second SOC threshold value is preferably but not limited to 90%.
For example, the first fluctuation amplitude threshold is preferably, but not limited to, 0.09pu; the second fluctuation amplitude threshold is preferably but not limited to 0.11pu.
Where pu is the unit of per unit value; the per unit value is a numerical value marking method commonly used in power system analysis and engineering calculation, and represents the relative value of each physical quantity and parameter, and the unit is pu (which can be considered as dimensionless); the per unit value is the same named value relative to a certain reference value, and when the reference value is selected differently, the per unit value is also different; their relationship is as follows: per unit value = named value/reference value.
Further, referring to fig. 1, the method of the embodiment of the present invention further includes:
step S3, when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a third control strategy when the I is smaller than the first fluctuation amplitude threshold value;
the third control strategy includes:
step S3.1, judging whether the SOC of the battery energy storage device is smaller than a third SOC threshold value, if yes, entering step S3.2; if not, go to step S3.3;
step S3.2, judging absolute value |DeltaV of fluctuation amplitude of DC bus voltage dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref Then judging whether the SOC of the battery energy storage device is smaller than a fourth SOC threshold value, if so, returning to the step S3.2, and if not, not performing any action;
step S3.3, judging whether the SOC of the battery energy storage device is more than 80%, if not, not performing any action; if yes, enter step S3.4;
step S3.4, judging |DeltaV dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage discharge reference value V disref And then judging whether the SOC of the battery energy storage device is larger than a fourth SOC threshold value, if so, returning to the step S3.4, and if not, not performing any action.
For example, the third SOC threshold value is preferably, but not limited to, 50% and the fourth SOC threshold value is preferably, but not limited to, 70%.
For example, the first fluctuation amplitude threshold is preferably, but not limited to, 0.09pu; the third fluctuation amplitude threshold is preferably, but not limited to, 0.03pu.
Referring to FIG. 2, the DC voltage discharge reference value V disref And a DC voltage charging reference value V chgref And a direct current voltage control mode for controlling a DC/DC bi-directional converter coupled to the battery energy storage device.
It should be noted that, in the embodiment of the present invention, the first control strategy is used in the solitary network state, so as to regulate the dc voltage and simultaneously ensure the SOC range of the battery energy storage device; the second control strategy is used for supporting the grid-connected inverter to adjust the direct-current voltage under large disturbance under the temporary power change in the energy storage compensation network in the networking state; the third control strategy is used for obtaining the SOC level required by the effective operation of the direct current micro-grid under the first control strategy and the second control strategy by the battery energy storage device in a networking state, and unnecessary interruption caused by over-charge and over-discharge is prevented.
Compared with the existing energy management strategy, the method provided by the embodiment of the invention considers the deep discharge and overcharge risks possibly faced by the battery energy storage device, considers the influence of the transient process on the direct current micro-grid system, and supports the grid-connected inverter to control the voltage stability of the direct current micro-grid by utilizing the charge and discharge function of the battery energy storage device.
Referring to fig. 3, another embodiment of the present invention further provides a management device, including: a memory 10 and a processor 20, the memory 10 having stored therein computer readable instructions 101, the computer readable instructions 101 when executed by the processor 20 cause the processor 20 to perform the steps of the dc micro grid battery stored energy management method according to the above described embodiments.
Of course, the management device may also have a wired or wireless network interface, a keyboard, an input/output interface, and other components for implementing the functions of the device, which are not described herein.
Illustratively, the computer program may be partitioned into one or more units, which are stored in the memory and executed by the processor to accomplish the present invention. The one or more elements may be a series of computer program instruction segments capable of performing a specified function, the instruction segments describing the execution of the computer program in the managing device.
The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the management device, and which connects the various parts of the entire management device using various interfaces and lines.
The memory may be used to store the computer program and/or the unit, and the processor may implement various functions of the management device by running or executing the computer program and/or the unit stored in the memory, and invoking data stored in the memory. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Another embodiment of the present invention also proposes a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method for energy storage management of a dc micro grid battery according to the above embodiment.
In particular, the computer-readable storage medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. The utility model provides a direct current micro grid battery energy storage energy management method, is applied to direct current micro grid, direct current micro grid includes grid-connected inverter, photovoltaic power generation device, direct current load and battery energy storage device, characterized by including:
executing a first control strategy when the direct current micro-grid is in a isolated grid state;
when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a second control strategy when the I is larger than or equal to the first fluctuation amplitude threshold value;
when the direct current micro-grid is in a networking state, and the absolute value of the voltage fluctuation amplitude of the direct current bus is |DeltaV dc Executing a third control strategy when the I is smaller than the first fluctuation amplitude threshold value;
the first control strategy includes:
step S1.1, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if yes, entering step S1.2; if not, entering a step S1.3;
step S1.2, judging the voltage fluctuation amplitude delta V of the direct current bus dc If the voltage is greater than 0, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the If not, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref ；
Step S1.3, judging whether the SOC is smaller than a first SOC threshold, if so, carrying out load shedding operation, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref The method comprises the steps of carrying out a first treatment on the surface of the If not, performing power reduction operation on the photovoltaic power generation module to ensure that the photovoltaic power generation module does not operate in an MPPT state, and setting a direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref ；
The second control strategy includes:
step S2.1, judging absolute value |DeltaV of fluctuation amplitude of direct current bus voltage dc Whether the I is larger than a second fluctuation amplitude threshold value or not, if so, controlling the direct current micro-grid to stop temporarily, and restarting the direct current micro-grid after the fault is cleared; if not, entering step S2.2;
step S2.2, judging whether the SOC of the battery energy storage device is larger than a first SOC threshold and smaller than a second SOC threshold, if so, entering step S2.3; if not, not performing any action;
step S2.3, judging the voltage fluctuation amplitude delta V of the direct current bus dc If the voltage is greater than 0, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage discharge reference value V disref The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage charging reference value V chgref ；
The third control strategy includes:
step S3.1, judging whether the SOC of the battery energy storage device is smaller than a third SOC threshold value, if so, entering step S3.2; if not, go to step S3.3;
step S3.2, judging absolute value |DeltaV of fluctuation amplitude of DC bus voltage dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, setting the direct-current voltage control instruction value of the battery energy storage device as a direct-current voltage charging reference value V chgref Then judging whether the SOC of the battery energy storage device is smaller than a fourth SOC threshold value, if so, returning to the step S3.2, and if not, not performing any action;
step S3.3, judging whether the SOC of the battery energy storage device is more than 80%, if not, not performing any action; if yes, enter step S3.4;
step S3.4, judging |DeltaV dc Whether the I is smaller than a third fluctuation amplitude threshold, if not, not performing any action; if yes, the direct-current voltage control instruction value of the battery energy storage device is set as a direct-current voltage discharge reference value V disref And then judging whether the SOC of the battery energy storage device is larger than a fourth SOC threshold value, if so, returning to the step S3.4, and if not, not performing any action.
2. The method of claim 1, wherein the performing a load dump operation comprises:
and interrupting the load participating in the demand response, judging whether the load capacity meets the load demand after the load interruption, stopping the load throwing operation if the load capacity meets the load demand, and interrupting unimportant loads if the load capacity does not meet the load demand.
3. The direct current microgrid battery storage energy management method of any of claims 1-2, wherein said first SOC threshold value is 30% and said second SOC threshold value is 90%.
4. The direct current microgrid battery storage energy management method of any one of claims 1-2, wherein said first fluctuation amplitude threshold is 0.09pu; the second fluctuation amplitude threshold is 0.11pu.
5. The direct current microgrid battery storage energy management method according to claim 4, wherein said third SOC threshold value is 50% and said fourth SOC threshold value is 70%.
6. The method of claim 4, wherein the first ripple magnitude threshold is 0.09pu; the third fluctuation amplitude threshold is 0.03pu.
7. A management device comprising: a memory and a processor, the memory having stored therein computer readable instructions that, when executed by the processor, cause the processor to perform the steps of the direct current microgrid battery storage energy management method according to any one of claims 1-6.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the direct current microgrid battery storage energy management method according to any one of claims 1-6.
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| CN109713659A (en) * | 2019-01-21 | 2019-05-03 | 许继电源有限公司 | A kind of direct-current grid and its coordinated operation method |
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| CN102916481A (en) * | 2012-08-16 | 2013-02-06 | 深圳微网能源管理系统实验室有限公司 | Direct-current microgrid system and energy management method thereof |
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