CN114243789B - Micro-grid control method and device, micro-grid main controller and storage medium - Google Patents
Micro-grid control method and device, micro-grid main controller and storage medium Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The application is applicable to the technical field of micro-grids, and provides a micro-grid control method and device, a micro-grid main controller and a storage medium, wherein the micro-grid control method comprises the following steps: acquiring the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state; if the generated power of the distributed power supply is not equal to the load of the micro-grid, sending a power adjustment instruction to an energy storage converter in the micro-grid according to the charge state of an energy storage battery in the micro-grid, wherein the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery; when the micro-grid is in an off-grid state and the distributed power supply is in a starting state, the generated power of the distributed power supply is adjusted according to the charge state of the energy storage battery. According to the scheme, the power generation power of the distributed power supply is adjusted in the grid-connected state and the off-grid state, so that the energy utilization rate of the distributed power supply can be improved.
Description
Technical Field
The application belongs to the technical field of micro-grids, and particularly relates to a micro-grid control method and device, a micro-grid main controller and a storage medium.
Background
The micro-grid is a small power generation and distribution system formed by integrating a distributed power supply, an energy storage device, related loads, a monitoring and protecting device and an energy storage converter (Power Conversion System, PCS), and can be used as a complete power system, and the functions of power balance control, system operation optimization, fault detection and protection, electric energy quality control and the like can be realized by means of the control and management functions of the micro-grid, so that the micro-grid can not only independently run off-grid, but also run in a grid connection with an external power grid.
The micro-grid has different structures, the superiority of the micro-grid mainly depends on the performance of core devices of the micro-grid, such as a micro-grid main controller, a background monitoring device, a distributed power grid-connected interface device and the like, and the micro-grid main controller is used as the most critical core device, and the control strategy of the micro-grid main controller plays a decisive role on the superiority of the whole micro-grid, such as the utilization of energy generated by a distributed power supply with the maximum efficiency.
Disclosure of Invention
The embodiment of the application provides a micro-grid control method and device, a micro-grid main controller and a storage medium, which can improve the energy utilization rate of a distributed power supply.
A first aspect of an embodiment of the present application provides a micro-grid control method, including:
acquiring the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state;
if the generated power of the distributed power supply is not equal to the load of the micro-grid, sending a power adjustment instruction to an energy storage converter in the micro-grid according to the charge state of an energy storage battery in the micro-grid, wherein the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the micro-grid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the micro-grid;
and when the micro-grid is in an off-grid state and the distributed power supply is in a starting state, regulating the generated power of the distributed power supply according to the charge state of the energy storage battery.
Optionally, before the micro grid is in the grid-connected state, the method further includes:
acquiring a grid-connected signal of the micro-grid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the micro-grid and an external power grid meet a synchronization condition or not and returning a judgment result of the synchronization condition, and the synchronization condition refers to that voltages, frequencies and phases on two sides of a switch connected with the micro-grid and the external power grid are in a synchronization state;
If the judging result indicates that the micro-grid and the external power grid meet the synchronous condition, determining that the micro-grid is in a grid-connected state;
and if the judging result indicates that the micro-grid and the external power grid do not meet the synchronous condition, determining that the micro-grid is in an off-grid state.
Optionally, if the generated power of the distributed power source is not equal to the load of the micro-grid, sending a power adjustment instruction to the energy storage converter according to the state of charge of the energy storage battery in the micro-grid includes:
if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is lower than a first preset percentage, a charging instruction is sent to the energy storage converter, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the micro-grid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, a power output instruction is sent to the energy storage converter, and the power output instruction is used for indicating the energy storage converter to output the generated power to target electric equipment according to the power utilization priority;
If the generated power of the distributed power supply is smaller than the load of the micro-grid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, a discharging instruction is sent to the energy storage converter, and the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
and if the generated power of the distributed power supply is smaller than the load of the external power grid and the charge state of the energy storage battery is lower than a third preset percentage, sending the charging instruction to the energy storage converter, wherein the third preset percentage is smaller than the second preset percentage.
Optionally, the micro grid control method further includes:
when the micro-grid is in a grid-connected state, if the generated power of the distributed power supply is detected to be larger than the preset power, the micro-grid is switched from the grid-connected state to an off-grid state.
Optionally, if the generated power of the distributed power source is detected to be greater than the preset power, switching the micro-grid from the grid-connected state to the off-grid state includes:
if the generated power of the distributed power supply is detected to be larger than the preset power, the generated power of the distributed power supply is regulated to be zero;
After the time length for adjusting the generated power of the distributed power supply to be zero reaches a preset time length, sending a power recovery instruction to the distributed power supply, wherein the power recovery instruction is used for indicating the distributed power supply to recover a full-power generation state;
and if the generated power of the distributed power supply after the power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from a grid-connected state to an off-grid state.
Optionally, the adjusting the generated power of the distributed power source according to the state of charge of the energy storage battery includes:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply;
and if the state of charge of the energy storage battery is lower than a fifth preset percentage, regulating the distributed power supply to generate full power.
Optionally, if the state of charge of the energy storage battery is greater than or equal to a fourth preset percentage, reducing the generated power of the distributed power source includes:
and when the working time is night time, if the charge state of the energy storage battery is larger than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply to zero.
A second aspect of an embodiment of the present application provides a micro grid control device, including:
the acquisition module is used for acquiring the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state;
the first power adjusting module is used for sending a power adjusting instruction to an energy storage converter in the micro-grid according to the charge state of an energy storage battery in the micro-grid if the generated power of the distributed power supply is not equal to the load of the micro-grid, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the micro-grid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the micro-grid;
and the second power adjusting module is used for adjusting the generated power of the distributed power supply according to the charge state of the energy storage battery when the micro-grid is in an off-grid state and the distributed power supply is in a starting state.
A third aspect of an embodiment of the present application provides a micro-grid main controller, including: the micro grid control method according to the first aspect is realized by a memory, a processor and a computer program stored in the memory and capable of running on the processor when the processor executes the computer program.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the micro grid control method described in the first aspect.
A fifth aspect of an embodiment of the present application provides a computer program product, which when run on a microgrid master controller, causes the microgrid master controller to perform the microgrid control method of the first aspect described above.
Compared with the prior art, the embodiment of the application has the beneficial effects that: when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, the method firstly obtains the power generation power of the distributed power supply and the load of the micro-grid; secondly, if the generated power of the distributed power supply is not equal to the load of the micro-grid, a power adjustment instruction is sent to the energy storage converter according to the charge state of the energy storage battery in the micro-grid so as to adjust the micro-grid and the micro-grid to be in a balanced state, and the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the micro-grid is in the off-grid state, the generated power of the distributed power supply is regulated according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. According to the scheme, the power generation power of the distributed power supply is adjusted in the grid-connected state and the off-grid state, so that the energy utilization rate of the distributed power supply can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a micro-grid control method according to a first embodiment of the present application;
FIG. 2 is a diagram of interactions of a micro-grid with consumer consumers and an external grid;
fig. 3 is a schematic flow chart of a micro-grid control method according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a micro-grid control device according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a micro-grid main controller according to a fourth embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The micro-grid is a small power generation and distribution system formed by integrating a distributed power supply, an energy storage device, a PCS, related loads and a monitoring and protecting device. Most of the power sources in the micro-grid are distributed power sources with smaller capacity, namely, a small-sized unit with a power electronic interface comprises an energy storage battery such as a fuel cell, a photovoltaic cell and a storage battery. They are connected to the user side and have the features of low cost, low voltage, less pollution, etc.
However, due to the dual pressures of environmental protection and energy exhaustion, renewable new energy becomes a new energy development direction, so that the development of the micro-grid also has great potential and benefit. In the development of micro-grids, the requirements of improving the reliability and quality of power supply and various constraints caused by remote power transmission are pushing to set up corresponding power sources near a load center, if each corresponding power source corresponds to an on-site controller, the complexity of the micro-grid is aggravated, and the implementation is difficult, so in practical application, the centralized control of the whole micro-grid is generally realized through a micro-grid main controller, no distributed on-site controller is needed, and the control strategy of the main controller of the micro-grid has decisive effect on the superiority of the whole micro-grid, for example: has decisive effect on the energy utilization rate in the micro-grid.
Therefore, in order to improve the energy utilization rate of the distributed power supply in the micro-grid, the application provides a micro-grid control method, which can acquire the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state; then when the generated power of the distributed power supply is not equal to the load of the micro-grid, a power adjustment instruction is sent to the energy storage converter according to the charge state of the energy storage battery in the micro-grid so as to adjust the micro-grid and the micro-grid to be in a balance state, and the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the micro-grid is in the off-grid state, the generated power of the distributed power supply is regulated according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. The energy utilization rate of the distributed power supply is improved through adjusting the generated power of the distributed power supply in the grid-connected state and the off-grid state.
It should be understood that, the sequence number of each step in this embodiment does not mean the execution sequence, and the execution sequence of each process should be determined by its function and internal logic, and should not limit the implementation process of the embodiment of the present application in any way.
In order to illustrate the technical scheme of the application, the following description is given by specific examples.
Referring to fig. 1, a schematic flow chart of a micro-grid control method according to an embodiment of the present application is shown, where the micro-grid control method may be applied to a micro-grid master controller. As shown in fig. 1, the micro grid control method may include the steps of:
step 101, when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, the power generation power of the distributed power supply and the load of the micro-grid are obtained.
The micro-grid is in a grid-connected state and can be in a switching-on state, the micro-grid can be connected with an external power grid through the grid-connected switch, the external power grid is a power grid comprising three units of power transformation, power transmission and power distribution, the external power grid is a large-scale power generation and distribution system, and the micro-grid is a small-scale power generation and distribution system formed by integrating a distributed power supply, an energy storage battery, a PCS, related loads and a monitoring and protecting device; the distributed power supply can comprise new energy power generation devices such as a wind power generation device (namely a fan), a photovoltaic power generation device and the like; the load of the micro-grid may refer to the power generated by the load operation within the micro-grid.
In the embodiment of the application, when the micro-grid is in a grid-connected state, whether the distributed power supply is in a power-on state or not is firstly detected, if the distributed power supply is in a power-off state, a power-on instruction is sent to the distributed power supply, so that the distributed power supply can be started for generating power, and after the distributed power supply is started, the micro-grid main controller can acquire the generated power of the distributed power supply and the power generated by load operation in the micro-grid.
In one possible embodiment, before the micro grid is in the grid-connected state, the method further includes:
acquiring a grid-connected signal of the micro-grid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the micro-grid and the external power grid meet a synchronization condition or not, and returning a judgment result of the synchronization condition, and the synchronization condition means that voltages, frequencies and phases of two sides of a switch connected with the micro-grid and the external power grid are in a synchronization state;
if the judging result indicates that the micro-grid and the external power grid meet the synchronous condition, determining that the micro-grid is in a grid-connected state;
and if the judging result indicates that the micro-grid and the external grid do not meet the synchronous condition, determining that the micro-grid is in an off-grid state.
In the embodiment of the application, the micro-grid may be in an off-grid running state before being in a grid-connected state, a grid-connected switch of the micro-grid is closed when the off-grid running state is achieved, an electric signal (namely a grid-connected signal) is generated when the grid-connected switch is in the grid-connected state, when the micro-grid main controller acquires the grid-connected signal, as a thyristor in the intelligent grid-connected cabinet shown in fig. 2 is still in an off state, and only when the thyristor of the intelligent grid-connected cabinet is in the grid-connected state, the micro-grid can be converted into the grid-connected state from the off-grid state, so that the micro-grid main controller transmits a grid-connected command to the PCS after acquiring the grid-connected signal, the PCS starts to detect the same period (namely, judges whether the micro-grid and the external grid meet the same period condition) after receiving the grid-connected command, and if the same period condition is met, the micro-grid main controller transmits the switch-on command to the intelligent grid-connected cabinet, so that the thyristor in the intelligent grid-connected cabinet is in the grid-connected state, and the micro-grid is successfully converted from the off-grid state.
It should be understood that the above-mentioned conversion of the micro-grid from the off-grid state to the grid-connected state may be applied to any operating time of the micro-grid, which is not limited by the present application.
Step 102, if the generated power of the distributed power supply is not equal to the load of the micro-grid, sending a power adjustment instruction to the energy storage converter in the micro-grid according to the state of charge of the energy storage battery in the micro-grid.
In the embodiment of the application, when the micro-grid is in a grid-connected state, the generated power of the distributed power supply can firstly ensure the running of the micro-grid, then on the basis of ensuring the normal running of the micro-grid, the redundant generated power generated by the distributed power supply is distributed and output, the generated power of the distributed power supply can ensure that the condition of the normal running of the micro-grid is equal to the generated power of the distributed power supply and the power required by the load running in the micro-grid, if the generated power of the distributed power supply is unequal to the power required by the load running in the micro-grid, a power regulating instruction is sent to the PCS, and the PCS regulates the total power which can be supplied by the distributed power supply and the energy storage battery according to the power regulating instruction, so that the total power which can be supplied is balanced with the power required by the load running in the micro-grid, and the micro-grid is in a power balanced state, and the utilization rate of the generated power of the distributed power supply is improved under the condition that the generated power of the distributed power supply is not limited.
In one possible implementation, if the generated power of the distributed power source is not equal to the load of the micro-grid, sending the power adjustment command to the energy storage converter according to the state of charge of the energy storage battery in the micro-grid includes:
if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is lower than a first preset percentage, a charging instruction is sent to the energy storage converter, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is higher than or equal to a first preset percentage, a power output instruction is sent to the energy storage converter, and the power output instruction is used for instructing the energy storage converter to output the generated power to target electric equipment according to the power utilization priority;
if the generated power of the distributed power supply is smaller than the load of the micro-grid and the charge state of the energy storage battery is higher than or equal to a second preset percentage, a discharging instruction is sent to the energy storage converter, and the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
if the power generation power of the distributed power supply is smaller than the load of the external power grid and the charge state of the energy storage battery is lower than a third preset percentage, a charging instruction is sent to the energy storage converter, and the third preset percentage is smaller than the second preset percentage.
In the embodiment of the present application, the PCS adjusts the power according to the power adjustment command specifically may be: firstly judging whether the generated power of the distributed power supply is larger than the load of the micro-grid, if the generated power of the distributed power supply is larger than the load of the micro-grid, indicating that the distributed power supply generates redundant generated power, in order to not waste the redundant generated power, improving the energy utilization rate of the distributed power supply, judging the charge state of the energy storage battery at the current moment, if the charge state of the energy storage battery is lower than a first preset percentage, indicating that the residual charge in the energy storage battery is insufficient, and needing to be charged, wherein a micro-grid main controller can send a charging instruction to a PCS, and the PCS charges the energy storage battery according to the charging instruction; if the state of charge of the energy storage battery is higher than a first preset percentage, the fact that the residual charge in the energy storage battery is sufficient and charging is not needed is indicated, at the moment, a power output instruction can be sent to the PCS by the micro-grid main controller, and the PCS outputs redundant power generation power to the target electric equipment according to the power output instruction and the power utilization priority.
The target electric equipment may be an external power grid and user electric equipment as shown in fig. 2, if the power utilization priority of the external power grid is higher than the power utilization priority of the user electric equipment, the PCS outputs redundant power to the external power grid according to the power output instruction, and if the power utilization priority of the user electric equipment is higher than the priority of the external power grid, the PCS outputs redundant power to the user electric equipment according to the power output instruction.
It should be understood that the PCS may charge the energy storage battery according to the charging command through the battery management device in fig. 2, where the battery management device refers to a device for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, extending the service life of the battery, and monitoring the state of the battery, such as a battery management system (Battery Management System, BMS), may obtain the state of charge of the energy storage battery through the BMS, and control the energy storage battery to charge and discharge through the BMS.
It should also be understood that, as shown in the interactive structure diagram of the micro-grid, the consumer electric equipment and the external power grid in fig. 2, it may be obtained that the micro-grid performs power interaction with the consumer electric equipment and the external power grid through the PCS, and when the micro-grid is in the grid-connected state, the micro-grid and the external power grid may be connected through the intelligent grid-connected cabinet.
For example, the first preset percentage in the embodiment of the present application may take a value of 70%, that is, the state of charge of the energy storage battery is lower than 70%, to determine that the energy storage battery needs to be charged; the state of charge of the energy storage battery is higher than or equal to 70%, the energy storage battery does not need to be charged, and redundant generated power can be sequentially output to an external power grid and user electric equipment according to the power utilization priority.
In the embodiment of the present application, the PCS may further specifically adjust power according to the power adjustment instruction: if the generated power of the distributed power supply is smaller than the load of the micro-grid, the generated power generated by the distributed power supply is insufficient to support the normal operation of the micro-grid, in order to ensure the normal operation of the micro-grid, the state of charge of the energy storage battery at the current moment can be judged, if the state of charge of the energy storage battery is higher than or equal to a second preset percentage, the residual charge in the energy storage battery is sufficient, the power required by operation can be provided for the micro-grid, wherein the second preset percentage can be equal to the first preset percentage or not, at the moment, a discharging instruction can be sent to the PCS by the micro-grid main controller, and the PC S controls the BMS to discharge the energy storage battery according to the discharging instruction; if the state of charge of the energy storage battery is lower than a third preset percentage, the fact that the residual charge in the energy storage battery is insufficient can be indicated, power required by operation cannot be provided for the micro-grid, power needs to be transmitted to the micro-grid by means of an external power grid so as to ensure that the micro-grid is in a power balance state, at this time, a charging instruction can be sent to the PCS by the micro-grid main controller, the PCS controls the BMS to charge the energy storage battery according to the charging instruction, namely, the power transmitted by the external power grid is input into the energy storage battery, wherein the third preset percentage can be the lower limit of the state of charge of the energy storage battery, and is lower than the lower limit of the state of charge, the energy storage battery can be in an overdischarge state, and the service life of the energy storage battery can be reduced.
It should be understood that the third preset percentage should be smaller than the second preset percentage, the second preset percentage may take a value of 70%, the third preset percentage may take a value of 40%, and the values are all examples, where the second preset percentage and the third preset percentage may be configured according to the actual situation of the micro-grid when the third preset percentage should be smaller than the second preset percentage, and the specific values of the second preset percentage and the third preset percentage are not limited in the present application.
It should also be understood that the PCS should limit the power of charge and discharge to within 60kw when controlling the BMS to perform charge and discharge operations, preventing overcharge and overdischarge.
And step 103, when the micro-grid is in an off-grid state and the distributed power supply is in a starting state, adjusting the generated power of the distributed power supply according to the charge state of the energy storage battery.
In the embodiment of the application, when the micro-grid is in an off-grid state, the PCS directly supplies power to the user electric equipment, namely, the power transmitted by the PCS is directly supplied to the user, and at the moment, the power of the PCS is not controlled by the micro-grid main controller, so when the micro-grid is in the off-grid state and the distributed power supply is in a starting state, the power generation power of the distributed power supply needs to be regulated according to the charge state of the energy storage battery, and the energy utilization rate of the distributed power supply is improved.
In one possible embodiment, adjusting the generated power of the distributed power source according to the state of charge of the energy storage battery comprises:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply;
and if the state of charge of the energy storage battery is lower than a fifth preset percentage, regulating the distributed power supply to generate full power.
The fourth preset percentage is usually the upper limit of the charge that the energy storage battery can carry, for example, the value may be 90%, and the fifth preset percentage is usually the lower limit of the charge that the energy storage battery can maintain for normal operation, for example, the value may be 10%.
For example, if the state of charge of the energy storage battery is higher than or equal to 90%, it is determined that the charge that the energy storage battery can carry has reached the upper limit, and the generated power of the distributed power source cannot be received, so the generated power of the distributed power source should be reduced (i.e. the generated power of the distributed power source is limited), and the reduced generated power of the distributed power source should be balanced with the power required by the load operation in the micro-grid.
For example, if the state of charge of the energy storage battery is lower than 10%, it is determined that the charge required for ensuring the normal operation of the energy storage battery has reached the lower limit, and at this time, the distributed power source should be adjusted to perform full power generation (i.e. the limitation of the generated power of the distributed power source is released), and the generated power generated by the full power of the distributed power source is input into the energy storage battery to ensure the normal operation of the energy storage battery.
It should be understood that when the working time of the micro-grid is daytime, if the state of charge of the energy storage battery is higher than or equal to the fourth preset percentage, the generated power of the distributed power source is reduced, so that the reduced generated power of the distributed power source should be balanced with the power required by the load operation in the micro-grid. If the working time of the micro-grid is night time and the charge state of the energy storage battery is higher than or equal to the fourth preset percentage, the generated power of the distributed power supply is reduced to zero, and the danger is avoided under the condition of no monitoring.
It should also be understood that when the operating time of the micro-grid is daytime and the distributed power sources are a photovoltaic power generation device and a wind power generation device, both the photovoltaic power generation device and the wind power generation device can generate power, so that reducing the generated power of the distributed power sources should reduce the generated power of the photovoltaic power generation device and the wind power generation device. And when the working time of the micro-grid is night time, the photovoltaic power generation device does not generate power, and at the moment, the generated power of the distributed power supply is reduced, so that the generated power of the wind power generation device is reduced.
In the embodiment of the application, when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state, the power generation power of the distributed power supply and the load of the micro-grid are firstly obtained; secondly, if the generated power of the distributed power supply is not equal to the load of the micro-grid, a power adjustment instruction is sent to the energy storage converter according to the charge state of the energy storage battery in the micro-grid so as to adjust the micro-grid and the micro-grid to be in a balanced state, and the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in a grid-connected state can be ensured; according to the embodiment of the application, when the micro-grid is in the off-grid state, the generated power of the distributed power supply is regulated according to the charge state of the energy storage battery, so that the maximization of the energy utilization rate of the distributed power supply in the off-grid state is ensured. According to the scheme, the power generation power of the distributed power supply is adjusted in the grid-connected state and the off-grid state, so that the energy utilization rate of the distributed power supply can be improved.
Referring to fig. 3, a schematic flow chart of a micro-grid control method according to a second embodiment of the present application is shown. As shown in fig. 3, the micro grid control method may include the steps of:
step 301, when the micro-grid is in a grid-connected state and the distributed power supply is in a start-up state, acquiring the generated power of the distributed power supply and the load of the micro-grid.
Step 302, if the generated power of the distributed power source is not equal to the load of the micro-grid, sending a power adjustment instruction to the energy storage converter in the micro-grid according to the state of charge of the energy storage battery in the micro-grid.
Steps 301 to 302 of this embodiment are the same as steps 101 to 102 of the foregoing embodiment, and can be referred to each other, and are not described herein.
Step 303, when the micro-grid is in the grid-connected state, if the generated power of the distributed power supply is detected to be greater than the preset power, the micro-grid is switched from the grid-connected state to the off-grid state.
In the embodiment of the application, the preset power may be the maximum power that the external power grid can bear, for example, the maximum power may take a value of 10 kilowatt hours, and when the generated power of the distributed power source is detected to be greater than the preset power, the micro power grid needs to be switched from the grid-connected state to the off-grid state, so as to reduce the loss caused to the external power grid.
In one possible implementation, the specific process of switching the micro-grid from the grid-connected state to the off-grid state may include:
if the generated power of the distributed power supply is detected to be larger than the preset power, the generated power of the distributed power supply is regulated to be zero;
after the time length for adjusting the generated power of the distributed power supply to be zero reaches the preset time length, sending a power recovery instruction to the distributed power supply;
and if the generated power of the distributed power supply after the power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from the grid-connected state to the off-grid state.
The power restoration instruction is used for indicating the distributed power supply to restore the full-power generation state.
In the embodiment of the application, when the generated power of the distributed power supply is detected to be larger than the preset power, the generated power of the distributed power supply can be limited to zero, if the generated power is not limited to zero, the distributed power supply continues to generate power in the switching process of grid connection and off-grid, off-grid voltage can be possibly increased instantaneously, at the moment, PCS can report hardware overvoltage and damage can be caused to hardware. And then limiting the generated power to be zero for 60 seconds (namely, preset time length, wherein the preset time length can take other values), sending a power recovery instruction to the distributed power supply to enable the distributed power supply to recover the full-power generation state, sending an off-grid instruction to the PCS if the generated power of the distributed power supply after power recovery is greater than the preset power, switching off a thyristor in the intelligent grid-connected cabinet according to the off-grid instruction by the PCS, switching off a grid-connected switch after switching off the thyristor to enable the micro-grid to enter an off-grid state, and completing switching from the grid-connected state to the off-grid state.
Step 304, when the micro-grid is in an off-grid state and the distributed power supply is in a start-up state, adjusting the generated power of the distributed power supply according to the charge state of the energy storage battery.
The step 304 of this embodiment is the same as the step 103 of the previous embodiment, and can be referred to each other, and the description of this embodiment is omitted here.
Compared with the first embodiment, the embodiment of the application increases the implementation method for switching the micro-grid from the grid-connected state to the off-grid state, particularly, when the micro-grid is in the grid-connected state, the magnitude relation between the generated power of the distributed power supply and the preset power is detected, and because the preset power is the maximum power which can be born by the external power supply, when the generated power of the distributed power supply is detected to be greater than the preset power, the micro-grid can be switched from the grid-connected state to the off-grid state by switching off the grid-connected switch.
Referring to fig. 4, a schematic structural diagram of a micro grid control device according to a third embodiment of the present application is shown, and for convenience of explanation, only a portion related to the embodiment of the present application is shown.
The micro-grid control device specifically may include the following modules:
the acquisition module 401 is configured to acquire power generation power of the distributed power supply and load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a power-on state;
the first power adjustment module 402 is configured to send a power adjustment instruction to an energy storage converter in the micro-grid according to a state of charge of an energy storage battery in the micro-grid if the generated power of the distributed power supply is unequal to the load of the micro-grid, where the power adjustment instruction is used to instruct the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to make the micro-grid in a power balance state, and the power balance state refers to a state in which the total power is balanced with the load of the micro-grid;
the second power adjustment module 403 is configured to adjust the generated power of the distributed power source according to the state of charge of the energy storage battery when the micro-grid is in an off-grid state and the distributed power source is in a power-on state.
In the embodiment of the application, the micro-grid control device specifically may further include the following modules:
the grid-connected instruction sending module is used for obtaining a grid-connected signal of the micro-grid, sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, and the grid-connected instruction is used for instructing the energy storage converter to judge whether the micro-grid and the external power grid meet the synchronous condition or not and returning a judging result of the synchronous condition, wherein the synchronous condition means that voltages, frequencies and phases of two sides of a switch connected with the micro-grid and the external power grid are in a synchronous state;
The first state determining module is used for determining that the micro-grid is in a grid-connected state if the judging result indicates that the micro-grid and the external grid meet the synchronous condition;
and the second state determining module is used for determining that the micro-grid is in an off-grid state if the judging result indicates that the micro-grid and the external grid do not meet the synchronous condition.
In an embodiment of the present application, the first power adjustment module 402 may specifically further include the following sub-modules:
the first instruction sending submodule is used for sending a charging instruction to the energy storage converter if the power generation of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is lower than a first preset percentage, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
the second instruction sending submodule is used for sending a power output instruction to the energy storage converter if the power generation power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is higher than or equal to a first preset percentage, and the power output instruction is used for indicating the energy storage converter to output the power generation power to target electric equipment according to the power utilization priority;
the third instruction sending submodule is used for sending a discharging instruction to the energy storage converter if the power generated by the distributed power supply is smaller than the load of the micro-grid and the charge state of the energy storage battery is higher than or equal to a second preset percentage, and the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
And the fourth instruction sending submodule is used for sending a charging instruction to the energy storage converter if the power generation of the distributed power supply is smaller than the load of the external power grid and the charge state of the energy storage battery is lower than a third preset percentage, and the third preset percentage is smaller than the second preset percentage.
In the embodiment of the application, the micro-grid control device specifically may further include the following modules:
and the state switching module is used for switching the micro-grid from the grid-connected state to the off-grid state if the generated power of the distributed power supply is detected to be larger than the preset power when the micro-grid is in the grid-connected state.
In the embodiment of the present application, the state switching module may specifically include the following sub-modules:
the adjusting sub-module is used for adjusting the generated power of the distributed power supply to be zero if the generated power of the distributed power supply is detected to be larger than the preset power;
the power recovery instruction sending sub-module is used for sending a power recovery instruction to the distributed power supply after the time length for adjusting the power generation power of the distributed power supply to zero reaches the preset time length, wherein the power recovery instruction is used for indicating the distributed power supply to recover the full-power generation state;
and the off-grid instruction sending submodule is used for sending an off-grid instruction to the energy storage converter to switch the micro-grid from the grid-connected state to the off-grid state if the generated power of the distributed power supply after power recovery is larger than the preset power.
In the embodiment of the present application, the second power adjustment module 403 may specifically further include the following sub-modules:
the power reduction submodule is used for reducing the generated power of the distributed power supply if the charge state of the energy storage battery is higher than or equal to a fourth preset percentage;
and the full-power generation sub-module is used for adjusting the distributed power supply to generate full power if the charge state of the energy storage battery is lower than a fifth preset percentage.
In the embodiment of the present application, the power reduction submodule may specifically further include the following units:
and the night adjusting module is used for reducing the generated power of the distributed power supply to zero if the charge state of the energy storage battery is larger than or equal to a fourth preset percentage when the working time of the micro-grid is the night time.
The micro-grid control device provided by the embodiment of the application can be applied to the foregoing method embodiment, and details of the method embodiment are referred to in the description of the foregoing method embodiment and are not repeated herein.
Fig. 5 is a schematic structural diagram of a micro-grid main controller according to a fourth embodiment of the present application. As shown in fig. 5, the micro grid main controller 500 of this embodiment includes: at least one processor 510 (only one is shown in fig. 5), a memory 520, and a computer program 521 stored in the memory 520 and executable on the at least one processor 510, the steps in the embodiments of the microgrid control method described above being implemented when the processor 510 executes the computer program 521.
The micro-grid master controller 500 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The micro-grid master controller may include, but is not limited to, a processor 510, a memory 520. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the micro grid master controller 500 and is not meant to limit the micro grid master controller 500, and may include more or less components than illustrated, or may combine certain components, or different components, such as may also include input-output devices, network access devices, etc.
The processor 510 may be a central processing unit (Central Processing Unit, CPU), the processor 510 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. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 520 may be an internal storage unit of the micro-grid master controller 500 in some embodiments, such as a hard disk or a memory of the micro-grid master controller 500. The memory 520 may also be an external storage device of the micro-grid main controller 500 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the micro-grid main controller 500. Further, the memory 520 may also include both internal storage units and external storage devices of the micro grid master controller 500. The memory 520 is used to store an operating system, application programs, boot Loader (Boot Loader), data, and other programs, such as program code of the computer program. The memory 520 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/micro grid master controller and method may be implemented in other ways. For example, the above-described apparatus/microgrid master controller embodiments are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable 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 (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The present application may also be implemented by a computer program product for implementing all or part of the steps of the above embodiments of the method, when the computer program product is run on a micro grid main controller, so that the micro grid main controller performs the steps of the above embodiments of the method.
The above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto. Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (7)
1. A micro-grid control method, characterized in that the micro-grid control method comprises:
acquiring the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state;
if the generated power of the distributed power supply is not equal to the load of the micro-grid, sending a power adjustment instruction to an energy storage converter in the micro-grid according to the charge state of an energy storage battery in the micro-grid, wherein the power adjustment instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the micro-grid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the micro-grid;
When the micro-grid is in an off-grid state and the distributed power supply is in a starting state, the power generation power of the distributed power supply is regulated according to the charge state of the energy storage battery;
if the generated power of the distributed power supply is not equal to the load of the micro-grid, sending a power adjustment instruction to an energy storage converter in the micro-grid according to the state of charge of an energy storage battery in the micro-grid, including:
if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is lower than a first preset percentage, a charging instruction is sent to the energy storage converter, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
if the generated power of the distributed power supply is larger than the load of the micro-grid and the state of charge of the energy storage battery is higher than or equal to a first preset percentage, a power output instruction is sent to the energy storage converter, and the power output instruction is used for indicating the energy storage converter to output the generated power to target electric equipment according to the power utilization priority;
if the generated power of the distributed power supply is smaller than the load of the micro-grid and the state of charge of the energy storage battery is higher than or equal to a second preset percentage, a discharging instruction is sent to the energy storage converter, and the discharging instruction is used for indicating the energy storage converter to discharge the energy storage battery;
If the generated power of the distributed power supply is smaller than the load of the micro-grid and the charge state of the energy storage battery is lower than a third preset percentage, sending the charging instruction to the energy storage converter, wherein the third preset percentage is smaller than the second preset percentage;
the micro-grid control method further comprises the following steps:
when the micro-grid is in a grid-connected state, if the generated power of the distributed power supply is detected to be larger than the preset power, the micro-grid is switched from the grid-connected state to an off-grid state;
if the generated power of the distributed power supply is detected to be larger than the preset power, switching the micro-grid from a grid-connected state to an off-grid state, including:
if the generated power of the distributed power supply is detected to be larger than the preset power, the generated power of the distributed power supply is regulated to be zero;
after the time length for adjusting the generated power of the distributed power supply to be zero reaches a preset time length, sending a power recovery instruction to the distributed power supply, wherein the power recovery instruction is used for indicating the distributed power supply to recover a full-power generation state;
and if the generated power of the distributed power supply after the power recovery is greater than the preset power, sending an off-grid instruction to the energy storage converter so as to switch the micro-grid from a grid-connected state to an off-grid state.
2. The micro-grid control method according to claim 1, further comprising, before the micro-grid is in a grid-connected state:
acquiring a grid-connected signal of the micro-grid, and sending a grid-connected instruction to the energy storage converter according to the grid-connected signal, wherein the grid-connected instruction is used for indicating the energy storage converter to judge whether the micro-grid and an external power grid meet a synchronization condition or not and returning a judgment result of the synchronization condition, and the synchronization condition refers to that voltages, frequencies and phases on two sides of a switch connected with the micro-grid and the external power grid are in a synchronization state;
if the judging result indicates that the micro-grid and the external power grid meet the synchronous condition, determining that the micro-grid is in a grid-connected state;
and if the judging result indicates that the micro-grid and the external power grid do not meet the synchronous condition, determining that the micro-grid is in an off-grid state.
3. The microgrid control method according to claim 1, wherein said adjusting the generated power of said distributed power supply according to the state of charge of said energy storage battery comprises:
if the state of charge of the energy storage battery is higher than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply;
And if the state of charge of the energy storage battery is lower than a fifth preset percentage, regulating the distributed power supply to generate full power.
4. The micro grid control method according to claim 3, wherein reducing the generated power of the distributed power source if the state of charge of the energy storage battery is greater than or equal to a fourth preset percentage comprises:
and when the working time of the micro-grid is night time, if the charge state of the energy storage battery is larger than or equal to a fourth preset percentage, reducing the generated power of the distributed power supply to zero.
5. A micro-grid control device, characterized in that the micro-grid control device comprises:
the acquisition module is used for acquiring the power generation power of the distributed power supply and the load of the micro-grid when the micro-grid is in a grid-connected state and the distributed power supply is in a starting state;
the first power adjusting module is used for sending a power adjusting instruction to an energy storage converter in the micro-grid according to the charge state of an energy storage battery in the micro-grid if the generated power of the distributed power supply is not equal to the load of the micro-grid, wherein the power adjusting instruction is used for indicating the energy storage converter to adjust the total power supplied by the distributed power supply and the energy storage battery so as to enable the micro-grid to be in a power balance state, and the power balance state refers to a state that the total power is balanced with the load of the micro-grid;
The second power adjusting module is used for adjusting the generated power of the distributed power supply according to the charge state of the energy storage battery when the micro-grid is in an off-grid state and the distributed power supply is in a starting state;
the first power adjustment module includes:
the first instruction sending submodule is used for sending a charging instruction to the energy storage converter if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is lower than a first preset percentage, and the charging instruction is used for indicating the energy storage converter to charge the energy storage battery;
the second instruction sending submodule is used for sending a power output instruction to the energy storage converter if the generated power of the distributed power supply is larger than the load of the micro-grid and the charge state of the energy storage battery is higher than or equal to a first preset percentage, and the power output instruction is used for instructing the energy storage converter to output the generated power to target electric equipment according to the power utilization priority;
a third instruction sending sub-module, configured to send a discharge instruction to the energy storage converter if the generated power of the distributed power supply is less than the load of the micro-grid and the state of charge of the energy storage battery is greater than or equal to a second preset percentage, where the discharge instruction is used to instruct the energy storage converter to discharge the energy storage battery;
A fourth instruction sending sub-module, configured to send the charging instruction to the energy storage converter if the generated power of the distributed power source is less than the load of the micro-grid and the state of charge of the energy storage battery is less than a third preset percentage, where the third preset percentage is less than the second preset percentage;
the micro grid control device further includes:
the state switching module is used for switching the micro-grid from the grid-connected state to the off-grid state if the generated power of the distributed power supply is detected to be larger than the preset power when the micro-grid is in the grid-connected state;
the state switching module comprises:
the adjusting sub-module is used for adjusting the generated power of the distributed power supply to be zero if the generated power of the distributed power supply is detected to be larger than the preset power when the micro-grid is in a grid-connected state;
the power recovery instruction sending sub-module is used for sending a power recovery instruction to the distributed power supply after the time length for adjusting the generated power of the distributed power supply to be zero reaches a preset time length, wherein the power recovery instruction is used for indicating the distributed power supply to recover a full-power generation state;
and the off-grid instruction sending submodule is used for sending an off-grid instruction to the energy storage converter to switch the micro-grid from a grid-connected state to an off-grid state if the generated power of the distributed power supply after power recovery is larger than the preset power.
6. A microgrid master controller comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 4 when executing the computer program.
7. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 4.
Priority Applications (1)
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| CN202111658211.0A CN114243789B (en) | 2021-12-30 | 2021-12-30 | Micro-grid control method and device, micro-grid main controller and storage medium |
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| CN202111658211.0A CN114243789B (en) | 2021-12-30 | 2021-12-30 | Micro-grid control method and device, micro-grid main controller and storage medium |
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| WO2012142841A1 (en) * | 2011-04-19 | 2012-10-26 | 河南电力试验研究院 | Method for implementing on/off-grid dual-mode operation of bidirectional converter in micro power grid |
| CN103647274A (en) * | 2013-11-26 | 2014-03-19 | 中国西电电气股份有限公司 | Micro-grid system being capable of grid-connected and off-grid operation, and energy control method |
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| WO2017184822A1 (en) * | 2016-04-20 | 2017-10-26 | Concept By Us Corporation | A photovoltaic sourced power station with integrated battery charge/discharge cycle |
| US20210075221A1 (en) * | 2019-09-06 | 2021-03-11 | King Fahd University Of Petroleum And Minerals | Real time energy management and control of renewable energy based microgrid in grid-connected and island modes |
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| CN103647274A (en) * | 2013-11-26 | 2014-03-19 | 中国西电电气股份有限公司 | Micro-grid system being capable of grid-connected and off-grid operation, and energy control method |
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| CN108063455A (en) * | 2017-12-11 | 2018-05-22 | 江苏辉伦太阳能科技有限公司 | One kind is from grid-connected photovoltaic energy storage inverter Poewr control method |
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