CN114123261A - Control method and device for energy storage system in micro-grid - Google Patents
Control method and device for energy storage system in micro-grid Download PDFInfo
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The embodiment of the application provides a method and a device for controlling an energy storage system in a micro-grid, relates to the field of energy storage control, and can improve the reliability of the micro-grid. The method comprises the following steps: the microgrid comprises: the system comprises a generator set, an energy storage system, a load system and a control system; the method is executed by a control system, wherein the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system run in parallel; detecting whether the generator set works or not; and when the generator set cannot work, controlling the energy storage system to provide electric energy for the load system.
Description
Technical Field
The embodiment of the application relates to the field of energy storage control, in particular to a method and a device for controlling an energy storage system in a microgrid.
Background
In recent years, with the increasing consumption of energy, people have more and more demand for electric power, and the scale of a power grid and the capacity of electric power transmitted over long distances are also increasing. The centralized large power grid power generation system cannot cope with the change of the power load, and the flexibility of the system is relatively poor. If the power plant is built for a short peak load, the cost performance is low. Therefore, in order to save resources and improve the flexibility of the power generation system, the microgrid system becomes the first choice for each power system.
The control mode of the generator set in the existing microgrid system is a voltage and frequency control mode (namely, a V/F control mode), the control mode of the energy storage system is a slave power supply, and the control mode of the energy storage system is a power control mode (namely, a P/Q control mode). When the generator set fails and cannot work normally, the energy storage system needs to be switched from the P/Q control mode to the V/F control mode when the voltage and the frequency in the current microgrid system need to be maintained stable, and when the generator set is restarted after the fault is repaired, the energy storage system needs to be switched back from the V/F control mode to the P/Q control mode.
However, the above energy storage system may be powered off in a short time during the switching of the control mode, thereby reducing the reliability of the microgrid.
Disclosure of Invention
The embodiment of the application provides a method and a device for controlling an energy storage system in a microgrid, which can provide the reliability of the microgrid.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, which includes: the system comprises a generator set, an energy storage system, a load system and a control system; the control method of the energy storage system in the micro-grid is executed by a control system, wherein the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system run in parallel; detecting whether the generator set works or not; and when the generator set cannot work, controlling the energy storage system to provide electric energy for the load system.
According to the control method of the energy storage system in the microgrid, the energy storage system and the generator set in the microgrid operate in the V/F control mode, whether the generator set works or not is detected through the control device, when the fact that the generator set cannot work is detected, the control device controls the energy storage system to directly provide electric energy for the load system, and due to the fact that the energy storage system operates in the V/F control mode, when the energy storage system needs to provide electric energy for the load system, the control mode of the energy storage system does not need to be converted, and therefore reliability of the microgrid is improved.
In a possible implementation manner, the method includes: detecting the frequency of the generator set under the condition that the generator set provides electric energy for a load system; when the frequency of the generator set rises, controlling the energy storage system to charge; and when the frequency of the generator set is reduced, controlling the energy storage system to provide electric energy for a load system. .
In a possible implementation manner, the method includes: detecting the actual power of the generator set under the condition that the generator set provides electric energy for a load system; when the actual power of the generator set exceeds the rated power of the generator set, controlling the energy storage system to provide electric energy for the load system so as to enable the generator set to operate below the rated power; and when the actual power of the generator set is less than or equal to the rated power of the generator set and the frequency of the generator is unchanged, controlling the energy storage system not to provide electric energy for the load system.
According to the control method of the energy storage system in the microgrid, when the actual power of the generator set exceeds the rated power of the generator set, the control device controls the energy storage system to provide electric energy for the load system, so that the generator set operates below the rated power, the problem of downtime caused by over-power operation of the generator set is solved, and the reliability of the microgrid system is further improved.
In a possible implementation manner, the method includes: and when the generator set is in black start, the energy storage system is used as a black start power supply.
In a second aspect, an embodiment of the present application provides a control apparatus for an energy storage system in a microgrid, the control apparatus including: the device comprises a detection module and a control module; the microgrid comprises: the system comprises a generator set, an energy storage system, a load system and a control system; the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system are operated in parallel; the detection module is used for detecting whether the generator set works or not; the control module is used for controlling the energy storage system to provide electric energy for the load system when the generator set cannot work.
In a possible implementation manner, the detection module is further configured to detect a frequency of the generator set when the generator set supplies electric energy to a load system; the control module is also used for controlling the energy storage system to charge when the frequency rises; the control module is also used for controlling the energy storage system to provide electric energy for the load system when the frequency of the generator set is reduced.
In a possible implementation manner, the detection module is further configured to detect an actual power of the generator set when the generator set provides the electric energy to the load system; the control module is also used for controlling the energy storage system to provide electric energy for the load system when the actual power of the generator set exceeds the rated power of the generator set so as to enable the generator set to operate below the rated power; the control module is also used for controlling the energy storage system not to provide electric energy for the load system when the actual power of the generator set is smaller than or equal to the rated power of the generator set and the frequency of the generator is not changed.
In a possible implementation manner, the control device further includes: the determining module is used for determining the energy storage system as a black start power supply when the generator set is in black start.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, the memory being coupled to the processor; the memory is for storing computer program code, wherein the computer program code includes computer instructions; the computer instructions, when executed by the processor, cause the electronic device to perform the method of the first aspect and any of its possible implementations.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which includes computer instructions, when the computer instructions are executed on a computing device, cause the computing device to perform the method described in any one of the above first aspect and possible implementation manners.
In a fifth aspect, embodiments of the present application provide a computer program product, which when run on a computer, causes the computer to execute the method described in any one of the first aspect and possible implementation manners.
It should be understood that, for the technical effects achieved by the technical solutions of the second aspect to the fifth aspect and the corresponding possible implementations of the embodiments of the present application, reference may be made to the technical effects of the first aspect and the corresponding possible implementations, and details are not described here again.
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Fig. 1 is a schematic diagram of a micro-grid system architecture according to an embodiment of the present application;
fig. 2 is a schematic hardware structure diagram of a control device according to an embodiment of the present disclosure;
fig. 3 is a first flowchart illustrating a method for controlling an energy storage system in a microgrid according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart illustrating a second method for controlling an energy storage system in a microgrid according to an embodiment of the present application;
fig. 5 is a schematic flow chart illustrating a third method for controlling an energy storage system in a microgrid according to an embodiment of the present application;
fig. 6 is a schematic flowchart illustrating a fourth method for controlling an energy storage system in a microgrid according to an embodiment of the present application;
fig. 7 is a schematic flowchart of a method for controlling an energy storage system in a microgrid according to an embodiment of the present application;
fig. 8 is a first structural schematic diagram of a control device according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a control device according to an embodiment of the present application.
Detailed Description
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first" and "second" and the like in the description of the embodiments of the present application are used for distinguishing different objects, and are not used for describing a specific order of the objects. For example, the first threshold value and the second threshold value, etc. are used to distinguish different threshold values, rather than to describe a particular order of the threshold values.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified. For example, a plurality of generators refers to two or more generators.
First, some concepts related to a method and an apparatus for controlling an energy storage system in a microgrid provided by an embodiment of the present application are explained:
the V/F control mode is: the control of the output voltage in direct proportion to the frequency is ensured, the magnetic flux of the motor is kept constant, and the weak magnetic field and the magnetic saturation are avoided.
The P/Q control mode is: a power grid and a diesel engine are connected into a micro-grid system, the control mode of the light storage all-in-one machine or the energy storage bidirectional converter is a P/Q mode, and active power and reactive power are output.
The black start means that after the whole system is stopped due to a fault, the system is completely powered off and is in a full black state, other network help is not relied on, the generator set with the self-starting capability in the system is started to drive the generator set without the self-starting capability, the recovery range of the system is gradually expanded, and finally the recovery of the whole system is realized.
Electrical frequency: is an abbreviation for current frequency. The frequency of the current is the frequency of the electric field, and due to the mutual conversion of the magnetic fields of the electric field, an electromagnetic field is formed at high frequency, that is, the number of conversion times within 1 second of the alternating current.
Along with the development of society, the demand of people for energy is also increasing greatly, and a micro-grid is applied to each power system as a flexible small-sized power grid.
In the present little grid system, generating set mainly used provides the electric energy to load system, and its control mode is V/F control mode, and energy storage system work is under P/Q control mode, through replenishing in time or absorbing the power in the little electric wire netting, and then with generating set maintain the stability of little electric wire netting medium voltage and frequency jointly, specifically include: when the generator set fails, the energy storage system needs to take over the generator set to provide electric energy for the load system, and therefore the energy storage system needs to be switched from the P/Q control mode to the V/F control mode; when the fault of the generator set is repaired and the generator set is restarted, the energy storage system needs to be replaced to provide electric energy for the load system, and at the moment, the energy storage system needs to be switched back to the P/Q control mode from the V/F control mode.
However, the above energy storage system may be powered off in a short time during the switching of the control mode, thereby reducing the reliability of the microgrid.
Based on this, the embodiment of the present application provides a method and an apparatus for controlling an energy storage system in a microgrid, and the microgrid includes: the system comprises a generator set, an energy storage system, a load system and a control system; the method is executed by a control device corresponding to a control system, wherein the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system are operated in parallel; the control device detects whether the generator set works or not, and when the generator set cannot work, the energy storage system is controlled to provide electric energy for the load system. Through the technical scheme provided by the embodiment of the application, the reliability of the micro-grid can be improved.
The control method for the energy storage system in the microgrid provided by the embodiment of the application can be applied to the microgrid system architecture shown in fig. 1. The microgrid system architecture comprises: load equipment 101, a generator set 102, energy storage equipment 103 and control equipment 104; the control modes of the generator set 102 and the energy storage device 103 are both V/F control modes, and the generator set 102 and the energy storage device 103 run in parallel.
The generator set 102 supplies electric energy to the load device 101 when operating, and the generator set 102 is composed of a plurality of generators, which may be diesel generators, gas generators, wind generators, and the like.
The control device 104 is configured to detect whether the generator set 102 operates, and when the generator set 102 does not operate, the control device 104 sends a power supply request to the energy storage device 103, so that the energy storage device 103 supplies electric energy to the load device 101 according to the power supply request; the control device 104 may be one server or a server cluster including a plurality of servers, and the server may be a computer having a computing capability, a cloud server, or the like.
The energy storage device 103 is used for absorbing or supplementing electric energy in the microgrid, such as: when the generator set 102 is not operating, the energy storage device 103 supplies power to the load device 101 according to the power supply request. The energy storage device 103 may be a flow battery or a solid battery.
The load device 101 uses the electrical energy provided by the genset 102 or the energy storage device 103 to produce work.
Alternatively, the control device 104 may be integrated in the energy storage device 103, and when the energy storage device 103 detects that the generator set 102 cannot operate, the energy storage device 103 directly supplies power to the load device 101.
Optionally, the control device 104 may be integrated in the generator set device 102, and when the generator set 102 cannot operate, the generator set 102 sends a power supply request to the energy storage device 103, and the energy storage device 103 supplies power to the load device 101 according to the power supply request.
Fig. 2 is a hardware schematic diagram of a control device (i.e., a control apparatus) provided in an embodiment of the present application, and as shown in fig. 2, the control apparatus includes a processor 201, a memory 202, and a network interface 203.
Wherein the processor 201 comprises one or more CPUs. The CPU may be a single-core CPU or a multi-core CPU.
Optionally, the processor 201 reads the instruction stored in the memory 202 to implement the control method for the energy storage system in the microgrid provided in the embodiment of the present application, or the processor 201 implements the control method for the energy storage system in the microgrid provided in the embodiment of the present application through the instruction stored inside. In the case that the processor 201 implements the method in the foregoing embodiment by reading the instruction stored in the memory 202, the memory 202 stores an instruction for implementing the method for controlling the energy storage system in the microgrid provided in the embodiment of the present application.
The network interface 203 is a wired interface (port), such as: communication is performed in 485/232, ethernet, can, and other communication methods, and communication protocols used in the communication include: the Modbus communication protocol or the can bus serial communication protocol. Alternatively, the network interface 203 is a wireless interface, such as: carry out the communication with modes such as infrared, wireless, microwave and bluetooth, adopt communication protocol to include when the communication: TCP or UDP. It should be understood that the network interface 203 includes a plurality of physical ports, and the network interface 203 is used to send power requests to the energy storage system.
Optionally, the control device further includes a bus 204, and the processor 201, the memory 202, and the network interface 203 are generally connected to each other through the bus 204, or are connected to each other in other manners.
The embodiment of the application provides a control method of an energy storage system in a microgrid, and the microgrid comprises: the system comprises a generator set, an energy storage system, a load system and a control system; as shown in fig. 3, the method may include S301-S302.
S301, the control device detects whether the generator set works or not.
Whether the generator set works or not can be determined by detecting main parameters of the generator set; the main parameters include: the power of the generator set, the oil temperature of the generator set, the water temperature of the generator set and other parameters.
It should be noted that, the control device periodically detects whether the generator set is working; the generator set is used for providing electric energy for the load system, the control mode of the generator set is a V/F control mode, and the generator set and the energy storage system are operated in parallel.
Whether the generator set works or not is used for indicating whether the generator set is in fault or not, wherein the generator set is composed of at least one generator set, and when a plurality of generators exist in the generator set, the generators are operated in parallel.
And S302, when the generator set cannot work, the control device controls the energy storage system to provide electric energy for the load system.
It should be noted that, when the generator set fails, the generator set cannot operate.
The control mode of the energy storage system is always a V/F control mode.
Illustratively, assume that the microgrid includes: diesel generating set (generating set), lithium cell group (energy storage system), refrigeration room (load system) and computer (controlling means), whether periodic detection diesel generating set of computer broke down, when diesel generating set broke down and can not work, the computer sent the power supply request to lithium cell group, and lithium cell group received directly for refrigerating the room after the power supply request and provides the electric energy.
According to the control method of the energy storage system in the microgrid, the energy storage system and the generator set in the microgrid operate in the V/F control mode, whether the generator set works or not is detected through the control device, when the fact that the generator set cannot work is detected, the control device controls the energy storage system to directly provide electric energy for the load system, and due to the fact that the energy storage system operates in the V/F control mode, when the energy storage system needs to provide electric energy for the load system, the control mode of the energy storage system does not need to be converted, and therefore reliability of the microgrid is improved.
Optionally, with reference to fig. 3 and as shown in fig. 4, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, further including: S401-S403.
S401, under the condition that the generator set supplies electric energy to the load system, the control device detects the frequency of the generator set.
The frequency of the generator set is specifically the electrical frequency in the generator set, also called current frequency.
It should be noted that the control device periodically detects the current frequency of the generator set.
S402, when the frequency of the generator set rises, the control device controls the energy storage system to charge.
When the load in the load system is sharply and greatly reduced, the control device detects that the frequency of the generator set is increased, and the control device controls the energy storage system to charge, so that the energy storage system absorbs the electric energy in the generator set, and the generator set is slowly de-loaded.
And S403, when the frequency of the generator set is reduced, the control device controls the energy storage system to provide electric energy for the load system.
It should be noted that, when the load in the load system increases sharply and greatly, the control device detects that the frequency of the generator set decreases, and controls the energy storage system to provide electric energy for the load system, so that the generator set and the energy storage system provide electric energy for the load system together, and further, the generator set is ensured to be loaded slowly.
Optionally, with reference to fig. 3 and as shown in fig. 5, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, further including: S501-S503.
S501, under the condition that the generator set provides electric energy for a load system, the control device detects the actual power of the generator set.
The actual power of the generator set refers to the current power of the generator set.
It should be noted that the control device periodically detects the actual power of the generator set.
And S502, when the actual power of the generator set exceeds the rated power of the generator set, the control device controls the energy storage system to provide electric energy for the load system so as to enable the generator set to operate below the rated power.
The power of the energy storage system for supplying the electric energy to the load system is the load power beyond the rated power of the generator set.
When the load power of the load system is greater than the rated power of the generator set, the actual power of the generator set may exceed the rated power of the generator set.
For example, assuming that the rated power of the generator set is 1000kW (watts), when the load power of the load system is 1200kW, the generator set is operated over the rated power; at the moment, the control device controls the energy storage system to provide electric energy corresponding to 200kW of power for the load system, and the generator set provides electric energy corresponding to 1000kW of power for the load system.
Optionally, based on the step S502, when the load power of the load system is smaller than the adjustable power of the generator set, and the difference between the adjustable power of the generator set and the load power of the load system is greater than the preset value, the energy storage system does not provide electric energy corresponding to a certain power to the load system any more. At this time, the control device executes S401-S403.
The adjustable power of the generator set is smaller than the rated power of the generator set.
Illustratively, based on the above example, assuming that the adjustable power of the generator set is 950kW and the preset value is 50kW, when the load power of the load system is decreased from 1200kW to 900kW, the energy storage system exits the power generation process (i.e., no electric energy corresponding to a certain power is provided to the load system).
And S503, when the actual power of the generator set is smaller than or equal to the rated power of the generator set and the frequency of the generator is unchanged, controlling the energy storage system not to provide electric energy for the load system by the control device.
According to the control method of the energy storage system in the microgrid, when the actual power of the generator set exceeds the rated power of the generator set, the control device controls the energy storage system to provide electric energy for the load system, so that the generator set and the energy storage system both provide the electric energy for the load system, the generator set runs below the rated power, the problem of downtime caused by the fact that the generator set runs at the ultrahigh power is further prevented, and therefore the reliability of the microgrid system is improved.
Optionally, as shown in fig. 6 with reference to fig. 3, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, further including: and S601.
S601, when the generator set is in black start, the control device takes the energy storage system as a black start power supply.
It should be noted that, after the energy storage system is used as a black start power supply to enable the generator set to be black started, the control device controls the energy storage system of the device to charge according to the load power of the load system under the condition that the generator set is not more than the rated power.
Optionally, with reference to fig. 3 and 5, as shown in fig. 7, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, further including: s701;
and S701, when the load power of the load system is smaller than the preset power and exceeds the preset duration, the control device controls the energy storage system to provide electric energy for the load system, and simultaneously controls the generator set to stop providing electric energy for the load system.
The preset power and the preset duration are configured in advance, wherein the preset threshold is smaller than the rated power of the generator set, and the duration that the load power of the load system is smaller than the preset power needs to be continuous.
It should be noted that the stop of the power supply of the generator set to the load system may be to control the generator set to be in a shutdown or standby state.
For example, assuming that the preset power is 80kW and the preset time period is 30 minutes, when the continuous time period in which the load power in the load system is less than 80kW exceeds 30 minutes, the control device controls the energy storage system to provide electric energy corresponding to 80kW to the load system and controls the generator set to be in a shutdown state.
Optionally, the above-mentioned controlling the generator set to be in the shutdown or standby state may also be manually controlled by a user.
According to the control method of the energy storage system in the microgrid, when the load power of the load system is smaller than the preset power and the duration is longer than the preset duration, the control device controls the energy storage system to provide electric energy for the load system, and simultaneously controls the generator set to stop providing the electric energy for the load system; thereby improving the economy of the use of the generator set and prolonging the service life of the generator set.
Optionally, an embodiment of the present application provides a method for controlling an energy storage system in a microgrid, further including: the energy storage system is charged or discharged (i.e., provides electrical energy to the load system) according to a preset strategy.
The energy storage system is charged by: the generator set provides electric energy to a load system while providing the electric energy to the load system, and the discharging of the energy storage system refers to: the energy storage system provides a certain amount of electric energy to the load system; the preset strategy specifically includes:
when the electric quantity of the energy storage system is lower than a first threshold value, the energy storage system sends an alarm message to the control device, wherein the alarm message is used for indicating that the energy storage system needs to be charged; when the electric quantity of the energy storage system is higher than a second threshold value, the energy storage system sends an alarm cancellation message to the control system, wherein the alarm cancellation message is used for indicating that the electric quantity of the energy storage system is higher than the second threshold value; wherein the first threshold is less than a second threshold.
When the electric quantity of the energy storage system is lower than a first threshold value, the energy storage system is charged with first charging power, wherein the first charging power is default charging power;
illustratively, when the circuit of the energy storage system is lower than 30% (first threshold), the energy storage system generates alarm information including the current electric quantity of the energy storage system to the control device, and the control device controls the generator set to charge the energy storage system with 100kW (first charging power) under the condition that the rated power is not exceeded. And when the circuit of the energy storage system is higher than 60%, the energy storage system sends a high-order cancellation message to the control system, wherein the alarm cancellation message is used for indicating that the electric quantity of the energy storage system is higher than a second threshold value.
And when the electric quantity of the energy storage system is higher than a third threshold value, the energy storage system is charged with second charging power, wherein the first threshold value is smaller than the third threshold value, and the first charging power is larger than the second charging power.
Illustratively, based on the above example, when the circuit of the energy storage system is higher than 80% (the third threshold), the control device controls the generator set to charge the energy storage system with 80kW (the second charging power).
When the electric quantity of the energy storage system is higher than a fourth threshold value, the energy storage system discharges at preset discharge power; and the fourth threshold is greater than the third threshold and less than the storable electric quantity of the energy storage system.
Illustratively, based on the above example, when the electrical circuit of the energy storage system is above 85% (fourth threshold), the energy storage system is discharged at 20kW of power.
The first threshold, the second threshold, the third threshold, the fourth threshold, the second charging power and the constant discharging power are configured in advance by a user.
Accordingly, an embodiment of the present application provides a control device (control device) for an energy storage system in a microgrid, where the control device is configured to execute each step in the method for controlling the energy storage system in the microgrid, and according to the method example, the control device may divide function modules, for example, each function module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
Fig. 8 shows a schematic diagram of a possible structure of the control device according to the above-described embodiment, in the case of dividing each functional module according to each function. As shown in fig. 8, the control device includes: a detection module 801 and a control module 802.
The detecting module 801 is configured to detect whether the generator set is operating, for example, execute step S301 in the foregoing method embodiment.
The control module 802 is configured to control the energy storage system to provide electric energy to the load system when the generator set is not operable, for example, to execute step S302 in the above method embodiment.
Optionally, the detecting module 801 is further configured to detect the frequency of the generator set when the generator set provides the power to the load system, for example, to execute step S401 in the foregoing method embodiment.
The control module 802 is further configured to control the energy storage system to charge when the frequency of the generator set increases, for example, to perform step S402 in the above method embodiment.
The control module 802 is further configured to control the energy storage system to provide the electric energy to the load system when the frequency of the generator set decreases, for example, to execute step S403 in the above method embodiment.
Optionally, the detecting module 801 is further configured to detect the actual power of the generator set when the generator set provides the electric energy to the load system, for example, to execute step S501 in the above method embodiment.
The control module 802 is further configured to control the energy storage system to provide the electric energy to the load system when the actual power of the electric generating set exceeds the rated power of the electric generating set, so as to operate the electric generating set below the rated power, for example, to execute step S502 in the above method embodiment.
The control module 802 is further configured to control the energy storage system and the load system to provide electric energy when the actual power of the generator set is less than or equal to the rated power of the generator set and the frequency of the generator is not changed, for example, to execute step S503 in the above method embodiment.
Optionally, the control device further includes: a determining module 803, where the determining module 803 is configured to determine the energy storage system as a black-start power supply when the generator set is in a black start, for example, to execute step S601 in the foregoing method embodiment.
Each module of the control device may also be configured to execute other actions in the method embodiment, and all relevant contents of each step related to the method embodiment may be referred to in the functional description of the corresponding functional module, which is not described herein again.
In the case of using an integrated unit, a schematic structural diagram of the control device provided in the embodiment of the present application is shown in fig. 9. In fig. 9, the control device includes: a processing module 901 and a communication module 902. The processing module 901 is used for controlling and managing actions of the control device, for example, executing the steps performed by the detection module 801, the control module 802, and the determination module 803 described above, and/or other processes for performing the techniques described herein. The communication module 902 is used for supporting the control device to send and receive signals. As shown in fig. 9, the control device may further comprise a memory module 903, the memory module 93 being used for storing program codes of the control device, counts of time ranges, etc.
The processing module 901 may be a processor or a controller, such as the processor 201 in fig. 2. The communication module 902 may be a transceiver, RF circuit or communication interface, etc., such as the network interface 203 in fig. 2. The storage module 903 may be a memory, such as the internal memory 202 in fig. 2.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produce, in whole or in part, the processes or functions described in the embodiments of the application. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wire (e.g., 485/232, ethernet, can, etc. communication means) or wirelessly (e.g., infrared, wireless, microwave, bluetooth, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Drive (SSD)), among others.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: flash memory, removable hard drive, read only memory, random access memory, magnetic or optical disk, and the like.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of controlling an energy storage system in a microgrid, the microgrid comprising: the system comprises a generator set, an energy storage system, a load system and a control system; the method is executed by the control system, wherein the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system are operated in parallel;
detecting whether the generator set works or not;
and when the generator set cannot work, controlling the energy storage system to provide electric energy for the load system.
2. The method of claim 1, further comprising:
detecting a frequency of the generator set while the generator set is providing electrical energy to the load system;
when the frequency rises, controlling the energy storage system to charge;
and when the frequency is reduced, controlling the energy storage system to provide electric energy for the load system.
3. The method of claim 1, further comprising:
detecting actual power of the generator set when the generator set is providing electrical energy to the load system;
when the actual power exceeds the rated power of the generator set, controlling the energy storage system to provide electric energy for the load system so as to enable the generator set to operate below the rated power;
and when the actual power of the generator set is smaller than or equal to the rated power of the generator set and the frequency of the generator is unchanged, controlling the energy storage system not to provide electric energy for the load system.
4. The method of claim 3, further comprising:
and when the generator set is in black start, the energy storage system is used as a black start power supply.
5. A control apparatus for an energy storage system in a microgrid, the control apparatus comprising: the device comprises a detection module and a control module;
the microgrid comprises: the system comprises a generator set, an energy storage system, a load system and a control system; the control modes of the generator set and the energy storage system are both V/F control modes, and the generator set and the energy storage system run in parallel;
the detection module is used for detecting whether the generator set works or not;
and the control module is used for controlling the energy storage system to provide electric energy for the load system when the generator set cannot work.
6. The control device according to claim 5,
the detection module is further used for detecting the frequency of the generator set under the condition that the generator set provides electric energy for the load system;
the control module is further used for controlling the energy storage system to charge when the frequency rises;
the control module is further used for controlling the energy storage system to provide electric energy for the load system when the frequency is reduced.
7. The control device according to claim 5,
the detection module is further used for detecting the actual power of the generator set under the condition that the generator set provides the electric energy to the load system;
the control module is further used for controlling the energy storage system to provide electric energy for the load system when the actual power exceeds the rated power of the generator set so that the generator set operates below the rated power;
the control module is also used for controlling the energy storage system not to provide electric energy for the load system when the actual power of the generator set is smaller than or equal to the rated power of the generator set and the frequency of the generator is unchanged.
8. The control device according to claim 5, characterized by further comprising: a determination module;
the determining module determines the energy storage system as a black start power supply when the generator set is in black start.
9. An electronic device comprising a memory and a processor, the memory coupled with the processor; the memory for storing computer program code, the computer program code comprising computer instructions; the computer instructions, when executed by the processor, cause the processor to perform the method of any of claims 1 to 4.
10. A computer readable storage medium comprising computer instructions which, when executed on a computing device, cause the computing device to perform the method of any of claims 1 to 4.
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