CN113437753A - Energy storage system - Google Patents
Energy storage system Download PDFInfo
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- CN113437753A CN113437753A CN202110978673.4A CN202110978673A CN113437753A CN 113437753 A CN113437753 A CN 113437753A CN 202110978673 A CN202110978673 A CN 202110978673A CN 113437753 A CN113437753 A CN 113437753A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 268
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 208000028659 discharge Diseases 0.000 claims description 197
- 230000008859 change Effects 0.000 claims description 52
- 238000007599 discharging Methods 0.000 claims description 20
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000007257 malfunction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J15/00—Systems for storing electric energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an energy storage system, which comprises an electric energy storage module group, a control module and a power supply module, wherein the electric energy storage module group comprises a plurality of electric energy storage modules, and each electric energy storage module is respectively connected with the output end of a power grid and used for storing electric energy; the electric energy release module is connected with the electric energy storage module and is used for storing the released electric energy; the detection module is respectively connected with the electric energy storage module group and the electric energy release module and used for detecting the operation conditions of the electric energy storage module group and the electric energy release module and sending the detection result to the control module; and the control module is connected with the detection module and used for controlling the operation of the system. The invention can accurately control the energy storage process and the electric energy release process of the energy storage system through the control of the control module on the electric energy storage and the electric energy release, find the fault of the system in time and effectively improve the monitoring effect and the control strength of the system on the energy storage process and the electric energy release process.
Description
Technical Field
The invention relates to the technical field of electric energy, in particular to an energy storage system.
Background
Energy storage, which mainly means that electric energy is converted into chemical energy, potential energy, kinetic energy, electromagnetic energy and other forms through a certain technology, so that the converted energy has the characteristics of spatial transferability (transmission independent of a power grid) or temporal transferability or quality control, and can be released in a mode (power, voltage, alternating current or direct current) suitable for power consumption requirements at a proper time and place to supply power for a power system, power utilization facilities and equipment for a long time or temporarily, such as battery energy storage, flywheel energy storage, water pumping energy storage, compressed air energy storage and the like.
Chinese patent publication No. CN 110212559A: an energy storage system for the repeated absorption of electrical energy for absorption, storage and release is disclosed; the intelligent control system comprises a control center used for receiving data, sending data and processing data, wherein an electric energy storage module, an electric energy detection module and an electric energy control module are arranged at a connecting end of the control center, an electric energy absorption module is arranged at an input end of the electric energy storage module, and an electric energy release module is arranged at an output end of the electric energy storage module. However, in practical use, the problems that the energy storage process and the electric energy release process of the energy storage system are not controlled, the fault of the system cannot be found in time, the monitoring effect is poor, and the control force is low exist.
Disclosure of Invention
Therefore, the invention provides an energy storage system, which is used for solving the problems that the energy storage process and the electric energy releasing process of the energy storage system are not controlled, the fault of the system cannot be found in time, the monitoring effect is poor and the control strength is low in the prior art.
To achieve the above object, the present invention provides an energy storage system, comprising:
the electric energy storage module group comprises a plurality of electric energy storage modules, and each electric energy storage module is respectively connected with the output end of the power grid and is used for storing redundant electric energy;
the electric energy release module is respectively connected with each electric energy storage module and used for releasing the stored electric energy;
the detection module is respectively connected with each electric energy storage module group and the electric energy release module and used for detecting the operation conditions of each electric energy storage module and each electric energy release module and sending the detection results to the control module;
the control module is connected with the detection module and used for controlling the system to operate, receiving the detection result transmitted by the detection module and adjusting the operation parameters of the corresponding parts according to the detection result;
the control module is preset with an electric energy storage rate, when the system stores electric energy, the detection module detects the actual electric energy storage rate V of the electric energy storage module in real time and transmits monitoring data to the control module after the detection is finished, and the control module judges the running condition of the electric energy storage module according to the actual electric energy storage rate V of the electric energy storage module;
the control module is also preset with a temperature change rate Q0, when the system stores electric energy, if the control module judges that the electric energy storage rate is too fast, the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q of the electric energy storage module with a preset temperature change rate Q0 and judges whether to adjust the actual electric energy storage rate of the electric energy storage module according to the comparison;
the control module is also preset with the residual electric quantity of the discharge performance modules, and when the system releases electric energy, the control module selects the corresponding discharge performance module according to the residual electric quantity of each discharge performance module.
Further, when the electric energy is stored, the control module compares the actual electric energy storage rate V of the electric energy storage module detected by the detection module with a preset electric energy storage rate pre-stored in the control module respectively and determines the operation condition of the electric energy storage module according to the comparison result, wherein a first electric energy storage rate V1 and a second electric energy storage rate V2 are preset in the control module;
when V is less than V1, the control module judges that the current electric energy storage rate of the electric energy storage module is too low and switches the electric energy storage module to store electric energy;
when V is not less than V1 and not more than V2, the control module judges that the electric energy storage rate of the current electric energy storage module is normal;
when V is larger than V2, the control module judges that the current electric energy storage rate of the electric energy storage module is too fast, and the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q with a preset temperature change rate Q0 according to Q and judges the running condition of the electric energy storage module according to the comparison.
Further, when the system stores electric energy and the control module determines that the electric energy storage rate is too fast, the control module compares the actual temperature change rate Q of the electric energy storage module measured by the detection module with a preset temperature change rate Q0 and adjusts the electric energy storage rate according to the comparison result;
if Q is less than or equal to Q0, the control module judges that the temperature change rate of the electric energy storage module meets the standard and does not change the electric energy storage rate;
if Q > Q0, the control module determines that the rate of change of the temperature of the electrical energy storage module is too fast and decreases the rate of electrical energy storage, and the control module records the decreased rate of electrical energy storage as Va and sets Va = Vx (Q-Q0/Q);
when the control module finishes adjusting the electric energy storage rate of the electric energy storage module, the control module records the temperature change rate after reducing the electric energy storage rate as Qa.
Further, when the system stores electric energy, the control module compares the temperature change rate Qa after the electric energy storage rate is reduced with a preset temperature change rate Q0 and judges the operation condition of the electric energy storage module according to the comparison result;
when Qa is less than or equal to Q0, the control module judges that the electric energy storage module operates normally and controls the electric energy storage module to store electric energy at the electric energy storage rate of Va;
when Qa > Q0, the control module determines that the electrical energy storage module is malfunctioning, controls another electrical energy storage module to store electrical energy, and issues a malfunction alert signal when the electrical energy storage module stores electrical energy.
Further, when the system stores electric energy and the control module determines that a plurality of electric energy storage modules with faults exist, the control module determines the grade of an alarm signal according to the ratio A of the number of the electric energy storage modules with faults to the total number of the electric energy storage modules, and sets A = N/N, and the control module determines a maintenance sequence according to the grade of the alarm signal, wherein N is the number of the electric energy storage modules with faults, and N is the total number of the electric energy storage modules;
when A is less than 50%, the control module sends a primary alarm signal;
when A is more than or equal to 50% and less than or equal to 80%, the control module sends out a secondary alarm signal;
when A is greater than 80%, the control module sends out a three-level alarm signal;
wherein the priority of the alarm signal/maintenance sequence is: tertiary alarm signal > secondary alarm signal > primary alarm signal.
Further, when the system discharges the electric energy, the control module classifies the electric energy storage modules according to the discharge performance W of the electric energy storage modules, and sets W = V '+ V, wherein V represents a charge rate under the same load, and V' represents a discharge rate under the same load, a first discharge performance W1, a second discharge performance W2, a third discharge performance W3 and a fourth discharge performance W4 are preset in the control module, and the control module selects the corresponding electric energy storage modules to discharge the electric energy according to the discharge performance grades of the electric energy storage modules, wherein W1 > W2 > W3 > W4;
when W is larger than or equal to W1, the control module judges that the electric energy storage module is a primary discharge performance module;
when W1 is larger than or equal to W2, the control module judges that the electric energy storage module is a secondary discharge performance module;
when W2 is larger than or equal to W3, the control module judges that the electric energy storage module is a three-level discharge performance module;
when W3 is larger than W4, the control module judges that the electric energy storage module is a four-stage discharge performance module;
wherein, the priority of the control module when the electric energy storage module discharges is as follows: the first-level discharge performance module, the second-level discharge performance module, the third-level discharge performance module and the fourth-level discharge performance module are connected in series.
Further, when the system releases the electric energy, the control module releases the electric energy according to the selected residual electric quantity Y of the actual discharge performance module, and the control module is preset with a first residual electric energy standard Y1 and a second residual electric energy standard Y2, wherein Y1 is less than Y2;
when Y is larger than or equal to Y2, the control module releases electric energy by using the current discharge performance module;
and when Y is less than Y1, the control module switches the discharge performance module to release electric energy.
Further, when the control module switches the discharge performance module, if the detection module detects that the remaining capacity of the discharge performance module is less than a first preset remaining capacity standard Y1, the control module releases the electric energy and stores the electric energy in the first discharge performance module by using the second discharge performance module, when the detection module detects that the remaining capacity of the second discharge performance module is a first preset remaining capacity Y1, the control module suspends the electric energy release by using the second discharge performance module, and simultaneously, the control module determines whether the remaining capacity of the first discharge performance module meets a second preset remaining capacity Y2, if the remaining capacity of the first discharge performance module meets a second preset remaining capacity Y2, the control module switches to the first discharge performance module to release the electric energy, and if the remaining capacity of the first discharge performance module does not meet the second preset remaining capacity Y2, and the control module is switched to the third discharge performance module to release the electric energy.
Further, when the control module switches the discharge performance module, if the detection module detects that the remaining power of the third discharge performance module is less than a first preset remaining power standard Y1, the control module selects the corresponding discharge performance module according to the remaining power of the first discharge performance module and the second discharge performance module, and if the remaining power of the first discharge performance module and the remaining power of the second discharge performance module are both greater than or equal to Y2, the control module compares the remaining power of the first discharge performance module and the remaining power of the second discharge performance module and selects the module with more remaining power as the discharge performance module; if the residual electric quantity of the first discharge performance module or the second discharge performance module is greater than or equal to Y2, the control module selects the discharge performance module with the residual electric quantity greater than or equal to Y2 to release electric energy; and if the residual electric quantity of the first discharge performance module and the residual electric quantity of the second discharge performance module are both smaller than Y1, the control module selects a fourth discharge performance module to release electric energy.
Further, when switching discharge performance modules, if the detection module detects that the remaining power of the fourth discharge performance module is less than a first preset remaining power standard Y1, the control module selects a corresponding discharge performance module according to the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module, if the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module is greater than or equal to Y2, the control module compares the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module and selects the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module as a discharge performance module, if the remaining power of the first discharge performance module, the second discharge performance module, or the third discharge performance module is greater than or equal to Y2, the control module selects a discharge performance module with the residual capacity more than or equal to Y2 to release the electric energy, and stops releasing the electric energy if the residual capacities of the first discharge performance module, the second discharge performance module and the third discharge performance module are less than Y1.
Compared with the prior art, the invention has the advantages that the control module is preset with an electric energy storage rate, when electric energy is stored, the control module compares the actual electric energy storage rate V of the electric energy storage module detected by the detection module with a preset electric energy storage rate, the control module is preset with a temperature change rate Q0, when electric energy is stored, the control module compares the actual temperature change rate Q of the electric energy storage module detected by the detection module with a preset temperature change rate Q0 and according to the comparison, the control module is preset with the residual electric quantity of the discharge performance module, when electric energy is released, the control module selects the corresponding discharge performance module according to the residual electric quantity of each discharge performance module, the control module controls the electric energy storage and the electric energy release, the energy storage process and the electric energy release process of the energy storage system can be accurately controlled, the efficiency of electric energy when storing and releasing can be improved, the trouble of system can further in time be discover, and then the monitoring effect and the control dynamics of this system are improved.
Furthermore, the control module compares the actual electric energy storage rate V of the electric energy storage module detected by the detection module with the preset electric energy storage rate and judges the operation condition of the electric energy storage module according to the comparison result, so that the energy storage process and the electric energy release process of the energy storage system can be accurately controlled, the efficiency of electric energy during storage and release can be improved, the faults of the system can be further found in time, and the monitoring effect and the control strength of the system are further improved.
Further, when the control module determines that the electric energy storage rate is too fast, the control module compares the actual temperature change rate Q of the electric energy storage module detected by the detection module with a preset temperature change rate Q0 and adjusts the electric energy storage rate according to the comparison result, and by adjusting the storage rate of the stored electric energy, the electric energy storage condition can be accurately mastered, the energy storage process and the electric energy release process of the energy storage system can be accurately controlled, the efficiency of the electric energy during storage and release can be improved, the fault of the system can be further timely discovered, and the monitoring effect and the control force of the system are further improved.
Further, when the electric energy is stored, the control module compares the temperature change rate Qa after the electric energy storage rate is reduced with the preset temperature change rate Q0 and judges the operation condition of the electric energy storage module according to the comparison result, the energy storage process and the electric energy release process of the energy storage system can be accurately controlled through the control of the temperature rate, the efficiency of the electric energy during the storage and the release can be improved, the fault of the system can be further found in time, and the monitoring effect and the control strength of the system can be further improved.
Further, when the control module judges that the electric energy storage module has a fault, the control module judges the grade of the alarm signal according to the ratio A of the number of the electric energy storage modules which actually have faults, and can accurately maintain the system fault through different grades of the alarm signal, so that the monitoring effect and the control strength of the system can be improved.
Further, when electric energy is released, the control module groups the electric energy storage modules according to the discharge performance W of the electric energy storage modules, and can accurately master the operation condition of the electric energy storage modules by grouping the electric energy storage modules, so that the monitoring effect and the control force of the system can be improved.
Furthermore, the control module is preset with a first electric energy residual standard Y1 and a second electric energy residual standard Y2, when electric energy is released, the control module releases electric energy to the electric energy storage module according to the residual electric quantity Y of the actual discharge performance module and the discharge performance sequence, the discharge performance module can be intelligently switched through the control of the residual electric quantity of the electric energy storage module, the damage of the system caused by over discharge can be avoided, and the monitoring effect and the control strength of the system can be improved.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage system according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention, including:
the electric energy storage module group comprises a plurality of electric energy storage modules, and each electric energy storage module is respectively connected with the output end of the power grid and is used for storing redundant electric energy in the system;
the electric energy release module is respectively connected with each electric energy storage module and used for releasing the stored electric energy;
the detection module is respectively connected with each electric energy storage module and each electric energy release module and is used for detecting the operation conditions of each electric energy storage module and each electric energy release module and sending the detection result to the control module;
the control module is connected with the detection module and used for receiving the detection result transmitted by the detection module and adjusting the operation parameters of the corresponding parts according to the detection result;
the control module is preset with an electric energy storage rate, when the system stores electric energy, the detection module detects the actual electric energy storage rate V of the electric energy storage module in real time and transmits monitoring data to the control module after the detection is finished, and the control module judges the running condition of the electric energy storage module according to the actual electric energy storage rate V of the electric energy storage module;
the control module is also preset with a temperature change rate Q0, when the system stores electric energy, if the control module judges that the electric energy storage rate is too fast, the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q of the electric energy storage module with a preset temperature change rate Q0 and judges whether to adjust the actual electric energy storage rate of the electric energy storage module according to the comparison;
the control module is also preset with the residual electric quantity of the discharge performance modules, and when the system releases electric energy, the control module selects the corresponding discharge performance module according to the residual electric quantity of each discharge performance module.
Specifically, when the electric energy is stored, the control module compares the actual electric energy storage rate V of the electric energy storage module detected by the detection module with a preset electric energy storage rate pre-stored in the control module respectively and determines the operation condition of the electric energy storage module according to the comparison result, wherein a first electric energy storage rate V1 and a second electric energy storage rate V2 are preset in the control module;
when V is less than V1, the control module judges that the current electric energy storage rate of the electric energy storage module is too low and switches the electric energy storage module to store electric energy;
when V is not less than V1 and not more than V2, the control module judges that the electric energy storage rate of the current electric energy storage module is normal;
when V is larger than V2, the control module judges that the current electric energy storage rate of the electric energy storage module is too fast, and the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q with a preset temperature change rate Q0 according to Q and judges the running condition of the electric energy storage module according to the comparison.
Specifically, when the system stores electric energy and the control module determines that the electric energy storage rate is too fast, the control module compares the actual temperature change rate Q of the electric energy storage module measured by the detection module with a preset temperature change rate Q0 and adjusts the electric energy storage rate according to the comparison result;
if Q is less than or equal to Q0, the control module judges that the temperature change rate of the electric energy storage module meets the standard and does not change the electric energy storage rate;
if Q > Q0, the control module determines that the rate of change of the temperature of the electrical energy storage module is too fast and decreases the rate of electrical energy storage, and the control module records the decreased rate of electrical energy storage as Va and sets Va = Vx (1-Q-Q0/Q);
when the control module finishes adjusting the electric energy storage rate of the electric energy storage module, the control module records the temperature change rate after reducing the electric energy storage rate as Qa.
Specifically, when the system stores electric energy, the control module compares the temperature change rate Qa after the electric energy storage rate is reduced with a preset temperature change rate Q0 and judges the operation condition of the electric energy storage module according to the comparison result;
when Qa is less than or equal to Q0, the control module judges that the electric energy storage module operates normally and controls the electric energy storage module to store electric energy at the electric energy storage rate of Va;
when Qa > Q0, the control module determines that the electrical energy storage module is malfunctioning, controls another electrical energy storage module to store electrical energy, and issues a malfunction alert signal when the electrical energy storage module stores electrical energy.
Specifically, when the system stores electric energy and the control module judges that a plurality of electric energy storage modules with faults exist, the control module judges the grade of an alarm signal according to the ratio A of the number of the electric energy storage modules with the faults to the total number of the electric energy storage modules, and sets A = N/N, and the control module determines a maintenance sequence according to the grade of the alarm signal, wherein N is the number of the electric energy storage modules with the faults, and N is the total number of the electric energy storage modules;
when A is less than 50%, the control module sends a primary alarm signal;
when A is more than or equal to 50% and less than or equal to 80%, the control module sends out a secondary alarm signal;
when A is greater than 80%, the control module sends out a three-level alarm signal;
wherein the priority of the alarm signal/maintenance sequence is: tertiary alarm signal > secondary alarm signal > primary alarm signal.
Specifically, when the system discharges the electric energy, the control module classifies the electric energy storage modules according to the discharge performance W of the electric energy storage modules, and sets W = V '+ V, wherein V represents a charge rate under the same load, V' represents a discharge rate under the same load, a first discharge performance W1, a second discharge performance W2, a third discharge performance W3 and a fourth discharge performance W4 are preset in the control module, and the control module selects the corresponding electric energy storage modules to discharge the electric energy according to the discharge performance grades of the electric energy storage modules, wherein W1 > W2 > W3 > W4;
when W is larger than or equal to W1, the control module judges that the electric energy storage module is a primary discharge performance module;
when W1 is larger than or equal to W2, the control module judges that the electric energy storage module is a secondary discharge performance module;
when W2 is larger than or equal to W3, the control module judges that the electric energy storage module is a three-level discharge performance module;
when W3 is larger than W4, the control module judges that the electric energy storage module is a four-stage discharge performance module;
wherein, the priority of the control module when the electric energy storage module discharges is as follows: the first-level discharge performance module, the second-level discharge performance module, the third-level discharge performance module and the fourth-level discharge performance module are connected in series.
Specifically, when the system releases electric energy, the control module releases electric energy according to the selected residual electric quantity Y of the actual discharge performance module, and the control module is preset with a first residual electric energy standard Y1 and a second residual electric energy standard Y2, wherein Y1 is less than Y2;
when Y is larger than or equal to Y2, the control module releases electric energy by using the current discharge performance module;
and when Y is less than Y1, the control module switches the discharge performance module to release electric energy.
Specifically, when the control module switches the discharging performance module, if the detection module detects that the remaining capacity of the discharging performance module is less than a first preset remaining capacity standard Y1, the control module releases the electric energy using the second discharging performance module and stores the electric energy in the first discharging performance module, when the detection module detects that the remaining capacity of the second discharging performance module is a first preset remaining capacity Y1, the control module suspends the release of the electric energy using the second discharging performance module, and simultaneously, the control module determines whether the remaining capacity of the first discharging performance module conforms to a second preset remaining capacity Y2, if the remaining capacity of the first discharging performance module conforms to a second preset remaining capacity Y2, the control module switches to the first discharging performance module to release the electric energy, and if the remaining capacity of the first discharging performance module does not conform to the second preset remaining capacity Y2, and the control module is switched to the third discharge performance module to release the electric energy.
Specifically, when the control module switches the discharge performance modules, if the detection module detects that the remaining power of the third discharge performance module is less than a first preset remaining power standard Y1, the control module selects the corresponding discharge performance module according to the remaining power of the first discharge performance module and the second discharge performance module, and if the remaining power of the first discharge performance module and the remaining power of the second discharge performance module are both greater than or equal to Y2, the control module compares the remaining power of the first discharge performance module and the remaining power of the second discharge performance module and selects the remaining power with more remaining power as the discharge performance module; if the residual electric quantity of the first discharge performance module or the second discharge performance module is greater than or equal to Y2, the control module selects the discharge performance module with the residual electric quantity greater than or equal to Y2 to release electric energy; and if the residual electric quantity of the first discharge performance module and the residual electric quantity of the second discharge performance module are both smaller than Y1, the control module selects a fourth discharge performance module to release electric energy.
Specifically, when switching discharge performance modules, if the detection module detects that the remaining power of the fourth discharge performance module is less than a first preset remaining power standard Y1, the control module selects a corresponding discharge performance module according to the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module, if the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module is greater than or equal to Y2, the control module compares the remaining power of the first discharge performance module, the second discharge performance module, and the third discharge performance module and selects the remaining power as the discharge performance module, and if the remaining power of the first discharge performance module, the second discharge performance module, or the third discharge performance module is greater than or equal to Y2, the control module selects a discharge performance module with the residual capacity more than or equal to Y2 to release the electric energy, and stops releasing the electric energy if the residual capacities of the first discharge performance module, the second discharge performance module and the third discharge performance module are less than Y1.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An energy storage system, comprising:
the electric energy storage module group comprises a plurality of electric energy storage modules, and each electric energy storage module is respectively connected with the output end of the power grid and is used for storing redundant electric energy in the system;
the electric energy release module is respectively connected with each electric energy storage module and used for releasing the stored electric energy;
the detection module is respectively connected with each electric energy storage module and each electric energy release module and is used for detecting the operation conditions of each electric energy storage module and each electric energy release module and sending the detection result to the control module;
the control module is connected with the detection module and used for receiving the detection result transmitted by the detection module and adjusting the operation parameters of the corresponding parts according to the detection result;
the control module is preset with an electric energy storage rate, when the system stores electric energy, the detection module detects the actual electric energy storage rate V of the electric energy storage module in real time and transmits monitoring data to the control module after the detection is finished, and the control module judges the running condition of the electric energy storage module according to the actual electric energy storage rate V of the electric energy storage module;
the control module is also preset with a temperature change rate Q0, when the system stores electric energy, if the control module judges that the electric energy storage rate is too fast, the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q of the electric energy storage module with a preset temperature change rate Q0 and judges whether to adjust the actual electric energy storage rate of the electric energy storage module according to the comparison;
the control module is also preset with the residual electric quantity of the discharge performance modules, and when the system releases electric energy, the control module selects the corresponding discharge performance module according to the residual electric quantity of each discharge performance module.
2. The energy storage system according to claim 1, wherein when the electric energy is stored, the control module compares the actual electric energy storage rate V of the electric energy storage module detected by the detection module with a preset electric energy storage rate pre-stored in the control module, and determines the operation condition of the electric energy storage module according to the comparison result, wherein the first electric energy storage rate V1 and the second electric energy storage rate V2 are pre-stored in the control module;
when V is less than V1, the control module judges that the current electric energy storage rate of the electric energy storage module is too low and switches the electric energy storage module to store electric energy;
when V is not less than V1 and not more than V2, the control module judges that the electric energy storage rate of the current electric energy storage module is normal;
when V is larger than V2, the control module judges that the current electric energy storage rate of the electric energy storage module is too fast, and the control module controls the detection module to detect the actual temperature change rate Q of the electric energy storage module in real time, compares the actual temperature change rate Q with a preset temperature change rate Q0 according to Q and judges the running condition of the electric energy storage module according to the comparison.
3. The energy storage system according to claim 2, wherein when the system stores electric energy and the control module determines that the electric energy storage rate is too fast, the control module compares the actual temperature change rate Q of the electric energy storage module measured by the detection module with a preset temperature change rate Q0 and adjusts the electric energy storage rate according to the comparison result;
if Q is less than or equal to Q0, the control module judges that the temperature change rate of the electric energy storage module meets the standard and does not change the electric energy storage rate;
if Q > Q0, the control module determines that the rate of change of the temperature of the electrical energy storage module is too fast and decreases the rate of electrical energy storage, and the control module records the decreased rate of electrical energy storage as Va and sets Va = Vx (Q-Q0/Q);
when the control module finishes adjusting the electric energy storage rate of the electric energy storage module, the control module records the temperature change rate after reducing the electric energy storage rate as Qa.
4. The energy storage system according to claim 3, wherein when the system stores electric energy, the control module compares the temperature change rate Qa after reducing the electric energy storage rate with a preset temperature change rate Q0 and determines the operation condition of the electric energy storage module according to the comparison result;
when Qa is less than or equal to Q0, the control module judges that the electric energy storage module operates normally and controls the electric energy storage module to store electric energy at the electric energy storage rate of Va;
when Qa > Q0, the control module determines that the electrical energy storage module is malfunctioning, controls another electrical energy storage module to store electrical energy, and issues a malfunction alert signal when the electrical energy storage module stores electrical energy.
5. The energy storage system of claim 4, wherein when the system is storing electrical energy and the control module determines that there are a plurality of failed electrical energy storage modules, the control module determines a level of the alarm signal according to a ratio A of the number of actually failed electrical energy storage modules to the total number of electrical energy storage modules, wherein A = N/N, and the control module determines a maintenance sequence according to the level of the alarm signal, wherein N is the number of actually failed electrical energy storage modules and N is the total number of electrical energy storage modules;
when A is less than 50%, the control module sends a primary alarm signal;
when A is more than or equal to 50% and less than or equal to 80%, the control module sends out a secondary alarm signal;
when A is greater than 80%, the control module sends out a three-level alarm signal;
wherein the priority of the alarm signal/maintenance sequence is: tertiary alarm signal > secondary alarm signal > primary alarm signal.
6. The energy storage system according to claim 5, wherein when the system discharges the electric energy, the control module classifies the electric energy storage modules according to their discharge performance W, and sets W = V '+ V, where V represents a charge rate under the same load, and V' represents a discharge rate under the same load, the control module is preset with a first discharge performance W1, a second discharge performance W2, a third discharge performance W3 and a fourth discharge performance W4, and selects the corresponding electric energy storage module to discharge the electric energy according to the discharge performance level of each electric energy storage module, where W1 > W2 > W3 > W4;
when W is larger than or equal to W1, the control module judges that the electric energy storage module is a primary discharge performance module;
when W1 is larger than or equal to W2, the control module judges that the electric energy storage module is a secondary discharge performance module;
when W2 is larger than or equal to W3, the control module judges that the electric energy storage module is a three-level discharge performance module;
when W3 is larger than W4, the control module judges that the electric energy storage module is a four-stage discharge performance module;
wherein, the priority of the control module when the electric energy storage module discharges is as follows: the first-level discharge performance module, the second-level discharge performance module, the third-level discharge performance module and the fourth-level discharge performance module are connected in series.
7. The energy storage system according to claim 6, wherein when the system discharges the electric energy, the control module releases the electric energy according to the remaining capacity Y of the selected actual discharging performance module, and the control module is preset with a first remaining electric energy criterion Y1 and a second remaining electric energy criterion Y2, wherein Y1 < Y2;
when Y is larger than or equal to Y2, the control module releases electric energy by using the current discharge performance module;
and when Y is less than Y1, the control module switches the discharge performance module to release electric energy.
8. The energy storage system according to claim 7, wherein when the control module switches the discharging performance module, if the detection module detects that the remaining capacity of the discharging performance module is less than the first predetermined remaining capacity criterion Y1, the control module releases the electric energy and stores the electric energy in the first discharging performance module using the second discharging performance module, when the detection module detects that the remaining capacity of the second discharging performance module is the first predetermined remaining capacity Y1, the control module suspends the release of the electric energy using the second discharging performance module, and at the same time, the control module determines whether the remaining capacity of the first discharging performance module meets the second predetermined remaining capacity Y2, and if the remaining capacity of the first discharging performance module meets the second predetermined remaining capacity Y2, the control module switches to the first discharging performance module for the release of the electric energy, if the residual capacity of the first discharge performance module does not accord with the second preset residual capacity Y2, the control module switches to the third discharge performance module to release the electric energy.
9. The energy storage system according to claim 8, wherein when the control module switches between the discharge performance modules, if the detection module detects that the remaining capacity of the third discharge performance module is less than a first preset remaining capacity criterion Y1, the control module selects the corresponding discharge performance module according to the remaining capacities of the first discharge performance module and the second discharge performance module, and if the remaining capacities of the first discharge performance module and the second discharge performance module are both greater than or equal to Y2, the control module compares the remaining capacities of the first discharge performance module and the second discharge performance module and selects the module with the greater remaining capacity as the discharge performance module; if the residual electric quantity of the first discharge performance module or the second discharge performance module is greater than or equal to Y2, the control module selects the discharge performance module with the residual electric quantity greater than or equal to Y2 to release electric energy; and if the residual electric quantity of the first discharge performance module and the residual electric quantity of the second discharge performance module are both smaller than Y1, the control module selects a fourth discharge performance module to release electric energy.
10. The energy storage system according to claim 9, wherein when switching discharge performance modules, if the detection module detects that the remaining capacity of the fourth discharge performance module is less than a first predetermined remaining capacity criterion Y1, the control module selects a corresponding discharge performance module according to the remaining capacities of the first, second and third discharge performance modules, if the remaining capacities of the first, second and third discharge performance modules are greater than or equal to Y2, the control module compares the remaining capacities of the first, second and third discharge performance modules and selects a larger remaining capacity as a discharge performance module, and if the remaining capacity of the first, second or third discharge performance module is greater than or equal to Y2, the control module selects a discharge performance module with the residual capacity more than or equal to Y2 to release the electric energy, and stops releasing the electric energy if the residual capacities of the first discharge performance module, the second discharge performance module and the third discharge performance module are less than Y1.
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