CN115473329B - Energy management method and device for hydrogen fuel cell standby power supply - Google Patents
Energy management method and device for hydrogen fuel cell standby power supply Download PDFInfo
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- CN115473329B CN115473329B CN202211420038.5A CN202211420038A CN115473329B CN 115473329 B CN115473329 B CN 115473329B CN 202211420038 A CN202211420038 A CN 202211420038A CN 115473329 B CN115473329 B CN 115473329B
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/10—Applications of fuel cells in buildings
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Abstract
The invention provides a method and a device for managing the energy of a hydrogen fuel cell standby power supply. The energy management method of the hydrogen fuel cell standby power supply is used for managing a standby power supply system, the system comprises a lithium battery, a hydrogen fuel cell, an energy storage converter and an alternating current load, the alternating current load is respectively and electrically connected with the lithium battery and the hydrogen fuel cell through the energy storage converter, the lithium battery is electrically connected with the hydrogen fuel cell, the alternating current load is electrically connected with a mains supply, and the method comprises the following steps: detecting an energy storage converter, and starting a hydrogen fuel cell when the energy storage converter meets set conditions; acquiring the required power P0 of an alternating current load; obtaining a target power value based on the required power P0 and the SOC of the lithium battery; the hydrogen fuel cell operation is controlled based on the target power value. The aim of avoiding frequent load change of the fuel cell, responding to the change of the alternating current load and prolonging the service life of the hydrogen fuel cell is fulfilled.
Description
Technical Field
The invention belongs to the technical field of power supply management, and particularly relates to a method and a device for managing the energy of a hydrogen fuel cell standby power supply.
Background
The traditional standby power supply uses an internal combustion engine as a generator and has the defects of low efficiency and environmental pollution. The hydrogen energy is a green renewable energy source, the product of the reaction of the hydrogen and the oxygen is water, and the hydrogen fuel cell adopts the reaction of the hydrogen and the oxygen, has no pollution and is the future development trend of the standby power supply. The first problem to be solved by hydrogen fuel cells as backup power sources is the energy management problem, because the life of the fuel cell is reduced if the fuel cell is frequently loaded.
Disclosure of Invention
The invention provides a method and a device for managing the energy of a hydrogen fuel cell standby power supply, aiming at solving the problem of the prior art that the service life of the hydrogen fuel cell is reduced due to frequent load change of the hydrogen fuel cell.
In a first aspect, an embodiment of the present disclosure provides a method for managing energy of a hydrogen fuel cell backup power supply, which is used for managing a backup power supply system, where the system includes a lithium battery, a hydrogen fuel cell, an energy storage converter, and an ac load, the ac load is electrically connected to the lithium battery and the hydrogen fuel cell through the energy storage converter, the lithium battery and the hydrogen fuel cell are electrically connected, and the ac load is electrically connected to a commercial power, and the method includes:
detecting an energy storage converter, and starting the hydrogen fuel cell when the energy storage converter meets set conditions;
acquiring the required power P0 of an alternating current load;
obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
the hydrogen fuel cell operation is controlled based on the target power value.
Optionally, detect the energy storage converter, when the energy storage converter satisfies the settlement condition, open hydrogen fuel cell, include:
and detecting whether the energy storage converter is in operation, detecting whether the energy storage converter is in an off-grid operation state when the energy storage converter is in operation, and starting the hydrogen fuel cell when the energy storage converter is in the off-grid operation state.
Optionally, obtaining the required power P0 of the ac load includes:
the required power P0 is obtained by detecting the current of an alternating current loop connected with an alternating current load.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes:
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes: when the SOC of the lithium battery changes, the output voltage of the lithium battery changes, the direct-current output voltage of the hydrogen fuel battery is used for charging the lithium battery, after a set time t, the required power P0 of the load is obtained, and the target power value is obtained based on the real-time SOC of the lithium battery and the obtained required power P0 of the load.
Optionally, the set time t is 30s,1min,2min or 5min.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes:
and detecting the change of the load current, controlling the current of the lithium battery based on the change of the load current, and obtaining the SOC of the lithium battery based on the current of the lithium battery.
Optionally, controlling the current of the lithium battery based on the change of the load current includes:
when the load current is increased, the output current of the lithium battery is increased, so that the output power of the lithium battery is increased, and the increased output power of the lithium battery is used for supplementing the instantaneous power generated by the increase of the load current;
when the load current decreases, the output current of the lithium battery is decreased, thereby decreasing the output power of the lithium battery, which is used for instantaneous power variation generated in response to the decrease in the load current.
In a second aspect, an embodiment of the present disclosure further provides an energy management device for a hydrogen fuel cell backup power supply, configured to manage a backup power supply system, where the system includes a lithium battery, a hydrogen fuel cell, an energy storage converter, and an ac load, where the ac load is electrically connected to the lithium battery and the hydrogen fuel cell through the energy storage converter, the lithium battery is electrically connected to the hydrogen fuel cell, and the ac load is electrically connected to a commercial power supply, and the device includes:
the starting module is used for detecting the energy storage converter and starting the hydrogen fuel cell when the energy storage converter meets the set conditions;
the power acquisition module is used for acquiring the required power P0 of the alternating current load;
the target power value module is used for obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
and a control module for controlling the operation of the hydrogen fuel cell based on the target power value.
Optionally, the target power value module is further configured to,
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
The invention provides a method and a device for managing the energy of a hydrogen fuel cell standby power supply. The method for managing the energy of the standby power supply of the hydrogen fuel cell utilizes the lithium battery to balance load change by combining the characteristic of alternating current load change, and increases the delay time of the load change of the fuel cell by the arranged lithium battery, thereby achieving the purposes of avoiding the frequent load change of the fuel cell, responding to the alternating current load change and prolonging the service life of the hydrogen fuel cell.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a functional block diagram of a backup power system provided by an embodiment of the present disclosure;
fig. 2 is a flow chart of a method for managing energy of a hydrogen fuel cell backup power supply according to an embodiment of the disclosure.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
It is to be understood that the embodiments of the present disclosure are described below by way of specific examples, and that other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.
It should be further noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
A fuel cell: a fuel cell is a chemical device that directly converts chemical energy of fuel into electrical energy, and is also called an electrochemical generator.
An inverter: the inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally, 220V,50Hz sine wave). It is composed of inverter bridge, control logic and filter circuit.
DC/DC: the direct current is converted into direct current.
DC/AC: the direct current is converted into alternating current.
The embodiment discloses a method for managing energy of a hydrogen fuel cell standby power supply, which is used for managing a standby power supply system, and the system comprises a lithium battery, a hydrogen fuel cell, an energy storage converter and an alternating current load, wherein the alternating current load is respectively and electrically connected with the lithium battery and the hydrogen fuel cell through the energy storage converter, the lithium battery is electrically connected with the hydrogen fuel cell, the alternating current load is electrically connected with a mains supply, and the method comprises the following steps:
detecting an energy storage converter, and starting a hydrogen fuel cell when the energy storage converter meets set conditions;
acquiring the required power P0 of an alternating current load;
obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
the hydrogen fuel cell operation is controlled based on the target power value.
Optionally, detect the energy storage converter, when the energy storage converter satisfies the settlement condition, open hydrogen fuel cell, include:
and detecting whether the energy storage converter is in operation, detecting whether the energy storage converter is in an off-grid operation state when the energy storage converter is in operation, and starting the hydrogen fuel cell when the energy storage converter is in the off-grid operation state.
Optionally, obtaining the required power P0 of the ac load includes:
the required power P0 is obtained by detecting the current of an alternating current loop connected with an alternating current load.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes:
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes: when the SOC of the lithium battery changes, the output voltage of the lithium battery changes, the lithium battery is charged by using the direct-current output voltage of the hydrogen fuel battery, after a set time t, the required power P0 of the load is obtained, and a target power value is obtained based on the real-time SOC of the lithium battery and the obtained required power P0 of the load.
Optionally, the set time t is 30s,1min,2min or 5min.
Optionally, obtaining the target power value based on the required power P0 and the SOC of the lithium battery includes:
and detecting the change of the load current, controlling the current of the lithium battery based on the change of the load current, and obtaining the SOC of the lithium battery based on the current of the lithium battery.
Optionally, controlling the current of the lithium battery based on the change of the load current includes:
when the load current is increased, the output current of the lithium battery is increased, so that the output power of the lithium battery is increased, and the increased output power of the lithium battery is used for supplementing the instantaneous power generated by the increase of the load current;
when the load current decreases, the output current of the lithium battery is decreased, thereby decreasing the output power of the lithium battery, which is used for instantaneous power variation generated in response to the decrease in the load current.
In a specific application scenario, the system architecture of the hydrogen fuel cell standby power supply system is shown in fig. 1, and the hydrogen fuel cell standby power supply device can quickly respond to power supply for a load when a power grid is powered off; the load can be continuously supplied with power independently by the system when no power grid exists. The system comprises a power supply change-over switch (including an incoming line switch), an energy storage converter PCS, a hydrogen fuel cell, a lithium battery pack and the like.
Fig. 2 shows a management method of the hydrogen fuel cell backup power supply system, which specifically includes the following steps:
s1: starting a fuel cell standby power supply;
s2: detecting whether the PCS is in operation, if so, entering S4, and otherwise, entering S3;
s3: shutting down the hydrogen fuel cell if the PCS is detected not to be operated;
s4: detecting whether the PCS controller feeds back an off-network state, if so, entering S6, and otherwise, entering S5;
s5: if the fuel cell is detected not to be in the off-grid running state, the starting condition of the fuel cell engine is not met, and the engine needs to be shut down;
s6: sending a starting command to the fuel cell to start the fuel cell;
s7: the PCS controller feeds back the load size in real time to obtain the load required power P0, namely the load size is confirmed by detecting the current of the alternating current loop, and the load power is high when the current is high. Because the internal resistance of the lithium battery is small, the voltage of the lithium battery is almost constant, so the voltage change is not large when the load changes.
S8: the fuel cell adjusts the output power along with the change of the load power, and the lithium battery provides the supplement power at the moment of load change. The lithium battery balances the voltage of the direct current bus, when the SOC of the lithium battery changes greatly, the output voltage also changes, and the lithium battery is charged by utilizing the voltage difference delta V between the DC output voltage of the fuel battery and the lithium battery at the moment. And generating a new target power value after the time t, wherein the output power of the fuel cell needs to respond to the load power and also needs to consider the SOC of the lithium battery, the target power is increased by a certain power delta P1 on the load power to charge the lithium battery when the SOC of the lithium battery is lower, and the target power is reduced by delta P2 to discharge the lithium battery when the SOC is higher. The load change is balanced by the lithium battery, so that the delay time t of the load change of the fuel cell is increased, and the frequent load change of the fuel cell is avoided, and particularly, the t can be 30s,1min,2min or 5min.
S9: controlling the operation of the fuel cell and the lithium battery according to the target power value;
s10: and detecting whether the load current is increased, if so, jumping to S11, and otherwise, jumping to S12.
S11: because the voltage change of the lithium battery is small, the current of the lithium battery is increased, the output power is increased when the current is increased, and the instantaneous power is supplemented.
S12: because the voltage change of the lithium battery is small, the current of the lithium battery is reduced, the output power is reduced when the current is reduced, and the instantaneous power change is responded.
This embodiment has still disclosed a hydrogen fuel cell stand-by power supply energy management device for manage stand-by power supply system, this system includes lithium cell, hydrogen fuel cell, energy storage converter and interchange load, interchange load passes through the energy storage converter and is connected with lithium cell and hydrogen fuel cell electricity respectively, lithium cell and hydrogen fuel cell electricity are connected, interchange load is connected with the commercial power electricity, and the device includes:
the starting module is used for detecting the energy storage converter and starting the hydrogen fuel cell when the energy storage converter meets the set conditions;
the power acquisition module is used for acquiring the required power P0 of the alternating current load;
the target power value module is used for obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
and the control module is used for controlling the operation of the hydrogen fuel cell based on the target power value.
Optionally, the target power value module is further configured to,
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the disclosure is not intended to be limited to the specific details so described.
In the present disclosure, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, and the block diagrams of devices, apparatuses, devices, systems, etc. referred to in the present disclosure are used merely as illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. As used herein, the words "or" and "refer to, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
Also, as used herein, "or" as used in a list of items beginning with "at least one" indicates a separate list, such that, for example, a list of "at least one of a, B, or C" means a or B or C, or AB or AC or BC, or ABC (i.e., a and B and C). Furthermore, the word "exemplary" does not mean that the described example is preferred or better than other examples.
It is also noted that in the systems and methods of the present disclosure, components or steps may be decomposed and/or re-combined. These decompositions and/or recombinations are to be considered equivalents of the present disclosure.
Various changes, substitutions and alterations to the techniques described herein may be made without departing from the techniques of the teachings as defined by the appended claims. Moreover, the scope of the claims of the present disclosure is not limited to the particular aspects of the process, machine, manufacture, composition of matter, means, methods and acts described above. Processes, machines, manufacture, compositions of matter, means, methods, or acts, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or acts.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the disclosure to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (8)
1. A hydrogen fuel cell standby power supply energy management method is used for managing a standby power supply system, the system comprises a lithium battery, a hydrogen fuel cell, an energy storage converter and an alternating current load, the alternating current load is respectively and electrically connected with the lithium battery and the hydrogen fuel cell through the energy storage converter, the lithium battery is electrically connected with the hydrogen fuel cell, the alternating current load is electrically connected with a mains supply, and the method is characterized by comprising the following steps:
detecting an energy storage converter, and starting a hydrogen fuel cell when the energy storage converter meets set conditions;
acquiring the required power P0 of an alternating current load;
obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
controlling the hydrogen fuel cell to operate based on the target power value;
the obtaining of the target power value based on the required power P0 and the SOC of the lithium battery comprises the following steps:
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
2. The energy management method for the hydrogen fuel cell backup power supply according to claim 1, characterized in that detecting the energy storage converter, and turning on the hydrogen fuel cell when the energy storage converter satisfies the set condition comprises:
and detecting whether the energy storage converter is in operation, detecting whether the energy storage converter is in an off-grid operation state when the energy storage converter is in operation, and starting the hydrogen fuel cell when the energy storage converter is in the off-grid operation state.
3. The energy management method for the hydrogen fuel cell backup power supply according to claim 1, wherein obtaining the required power P0 of the ac load comprises:
the required power P0 is obtained by detecting the current of an alternating current loop connected with an alternating current load.
4. The energy management method for the backup power source of the hydrogen fuel cell according to claim 1, wherein the obtaining of the target power value based on the required power P0 and the SOC of the lithium battery includes: when the SOC of the lithium battery changes, the output voltage of the lithium battery changes, the direct-current output voltage of the hydrogen fuel battery is used for charging the lithium battery, after a set time t, the required power P0 of the load is obtained, and the target power value is obtained based on the real-time SOC of the lithium battery and the obtained required power P0 of the load.
5. The energy management method for the hydrogen fuel cell backup power supply according to claim 4, characterized in that the set time t is 30s,1min,2min or 5min.
6. The energy management method for the hydrogen fuel cell backup power supply according to claim 1, wherein the obtaining of the target power value based on the required power P0 and the SOC of the lithium battery includes:
and detecting the change of the load current, controlling the current of the lithium battery based on the change of the load current, and obtaining the SOC of the lithium battery based on the current of the lithium battery.
7. The energy management method for the hydrogen fuel cell backup power supply according to claim 6, wherein controlling the lithium battery current based on the change of the load current comprises:
when the load current is increased, the output current of the lithium battery is increased, so that the output power of the lithium battery is increased, and the increased output power of the lithium battery is used for supplementing the instantaneous power generated by the increase of the load current;
when the load current decreases, the output current of the lithium battery is decreased, thereby decreasing the output power of the lithium battery, which is used for instantaneous power variation generated in response to the decrease in the load current.
8. The utility model provides a hydrogen fuel cell stand-by power supply energy management device for manage stand-by power supply system, this system includes lithium cell, hydrogen fuel cell, energy storage converter and interchange load, interchange load passes through the energy storage converter and is connected with lithium cell and hydrogen fuel cell electricity respectively, lithium cell and hydrogen fuel cell electricity are connected, interchange load is connected with the commercial power electricity, its characterized in that, the device includes:
the starting module is used for detecting the energy storage converter and starting the hydrogen fuel cell when the energy storage converter meets the set conditions;
the power acquisition module is used for acquiring the required power P0 of the alternating current load;
the target power value module is used for obtaining a target power value based on the required power P0 and the SOC of the lithium battery;
a control module for controlling operation of the hydrogen fuel cell based on the target power value;
the target power value module is further configured to,
when the SOC of the lithium battery is lower than a first set value, increasing a set power delta P1 on the required power P0 to charge the lithium battery, and obtaining a target power value based on the required power P0 and the set power delta P1;
and when the SOC of the lithium battery is higher than a second set value, controlling the lithium battery to discharge, wherein the discharge power is delta P2, and obtaining a target power value based on the required power P0 and the discharge power delta P2.
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