CN113346533A - Echelon utilization energy storage system with power capable of being input step by step - Google Patents
Echelon utilization energy storage system with power capable of being input step by step Download PDFInfo
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- CN113346533A CN113346533A CN202110786088.4A CN202110786088A CN113346533A CN 113346533 A CN113346533 A CN 113346533A CN 202110786088 A CN202110786088 A CN 202110786088A CN 113346533 A CN113346533 A CN 113346533A
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- power conversion
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- echelon
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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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- 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
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
Abstract
The invention discloses a echelon utilization energy storage system with gradually input power, aiming at the problems that the existing echelon batteries are unstable due to the difference between new batteries and old batteries in the aspects of discharge multiplying power, self reliability, battery consistency and the like, a data processing device is used for acquiring data of a power grid bus, judging the current power grid working state and predicting the power demand of the power grid bus in a future time period, reporting the high power demand to a monitoring device, comparing the high power demand with a preset power threshold value to make directional judgment of the power, sending a control instruction to control the running state and the power direction of each power conversion sub-device in a multi-stage power conversion device according to the judgment result, and flexibly controlling the input number of the power conversion sub-devices, thereby controlling the output power of a power converter, achieving the effect of gradually input, and avoiding the over-high discharge multiplying power caused by the quality difference of the batteries, High temperature, poor consistency and the like.
Description
Technical Field
The invention belongs to the technical field of energy power supply, and particularly relates to a echelon utilization energy storage system with gradually-input power.
Background
China continuously improves the autonomous contribution in the global green low-carbon transformation direction and actively adopts more powerful policies and measures. The occupation ratio of renewable energy sources such as wind power and photovoltaic is improved, new energy automobiles are actively developed, and the energy storage industry is vigorously developed, so that the method is undoubtedly an effective means and way for completing the task. With the continuous development of new energy industry, the echelon utilization of the energy storage battery has a larger development space in both technology and cost control.
However, the existing energy storage system for the battery with the gradient utilization is not obviously different from the energy storage system for the new battery in terms of control strategy or main structure. In the aspects of peak-valley arbitrage, standby power, virtual capacity increase and the like, two energy storage systems using new and old batteries have good performance, but it must be noted that the echelon batteries have obvious difference in the aspects of discharge rate, self reliability, battery consistency and the like compared with new batteries.
Disclosure of Invention
The invention aims to provide a echelon utilization energy storage system with gradually-input power, the charging and discharging power of the echelon utilization energy storage system can be adjusted in real time according to the field state, different power conversion subsystems can work simultaneously, alternately or even do not work for a long time, and the problems of overhigh discharging multiplying power, overhigh temperature, poor consistency and the like caused by the quality difference of batteries are avoided.
In order to solve the problems, the technical scheme of the invention is as follows:
a echelon utilization energy storage system with power capable of being input step by step comprises a multistage power conversion device, a battery management device, a data processing device and a monitoring device;
the multistage power conversion device comprises n power conversion sub-devices capable of independently working, wherein each power conversion sub-device comprises a echelon battery pack and a corresponding power converter;
the battery management device is used for detecting the voltage and the current of the echelon battery pack in the power conversion sub-device and the voltage and the temperature of a single battery in real time, acquiring the state of each echelon battery pack, judging whether a battery fault occurs or not, and if so, performing corresponding protection operation;
the data processing device is used for acquiring the voltage, the current and the power of the power grid bus in real time, judging the working state of the power grid, predicting the power demand of the power grid bus in a future time period and reporting the power demand to the monitoring device;
and the monitoring device compares the power demand with a preset power threshold value, makes directional judgment on power, and sends a control instruction to control the running state and the power direction of each power conversion sub-device in the multistage power conversion device according to a judgment result.
According to an embodiment of the present invention, the determining the directionality of the power by the monitoring device includes:
setting the power demand as S, the power threshold as S', and the rated power of the single power conversion sub-device as SeThen, when S-S'>SeIf so, determining to send power, and sending a discharge command to the multistage power conversion device;
when is-Se<S-S'<SeIf so, determining the state as a standby state;
when S' -S>SeWhen the power is absorbed, the power is determined and a charging command is transmitted to the multistage power conversion device.
According to an embodiment of the invention, when S-S'>m*SeWhen the power conversion device is used, the monitoring device sends a command that m power conversion sub-devices are required to discharge to the multi-stage power conversion device, and m is less than or equal to n;
and the battery management device selects a target power conversion sub-device to discharge and output power according to the state of each echelon battery pack.
According to an embodiment of the present invention, when the battery management device detects that the temperature of the gradient battery pack in a certain operating power conversion sub-device is higher than that of other operating power conversion sub-devices, or the current of the gradient battery pack in a certain operating power conversion sub-device is lower than that of other operating power conversion sub-devices, the operation of the power conversion sub-device is stopped, and the power conversion sub-device is switched to the power conversion sub-device which is not currently in operation.
According to an embodiment of the present invention, the batteries in the echelon battery pack in each power conversion sub-device may adopt batteries with different specifications, different models, different brands and different types, and the maximum output power of each power conversion sub-device is the same.
According to an embodiment of the present invention, the power directions of the power conversion sub-devices which are operated together at the same time are consistent, that is, the battery is charged from the power grid input at the same time, or the battery is discharged from the power grid input at the same time.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) aiming at the problems of instability of the existing echelon batteries in aspects of discharge multiplying power, self reliability, battery consistency and the like due to the difference of new batteries and old batteries, the echelon utilization energy storage system with power capable of being input step by step in one embodiment of the invention collects data of a power grid bus through a data processing device, judges the current power grid working state and predicts the power demand of the power grid bus in a future time period, reports the high power demand to a monitoring device, compares the high power demand with a preset power threshold value to make directional judgment of power, sends a control instruction to control the running state and the power direction of each power conversion sub-device in a multi-stage power conversion device according to the judgment result, flexibly controls the input number of the power conversion sub-devices, controls the output power of a power converter, achieves the effect of step by step input, and avoids the phenomenon that the discharge multiplying power is overhigh due to the quality difference of the batteries, High temperature, poor consistency and the like.
2) In the embodiment of the invention, the energy storage system is utilized by echelons in which power can be input step by step, and the battery management device can acquire the states of the battery packs of the echelons by detecting the voltage and the current of the battery packs of the echelons in the power conversion sub-device and the voltage and the temperature of a single battery, so that which power conversion sub-device is suitable for being input and which power conversion sub-device should be switched out is determined, and the battery management device is particularly suitable for application of the echelon battery with the safety performance lower than that of a brand new battery.
3) The energy storage system is utilized in a echelon mode, wherein power can be input step by step, and the energy storage system has convenient maintainability and flexible expandability; each power conversion sub-device is provided with a relatively independent echelon battery pack and a power converter, if a certain battery pack has a fault, the corresponding power conversion sub-device is disconnected from the energy storage system and replaced, and the normal work of other power conversion sub-devices is not influenced. When the load capacity requirement changes, the power conversion sub-device with the corresponding capacity is added or removed on the bus, which is very convenient.
Drawings
FIG. 1 is a schematic structural diagram of a echelon utilization energy storage system with stepwise input of power according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-stage power conversion device according to an embodiment of the invention.
Description of reference numerals:
1: a multi-stage power conversion device; 101: a power conversion sub-device; 2: a battery management device; 3: a data processing device; 4: a monitoring device; 5: and a bus bar.
Detailed Description
The following describes in detail a echelon utilization energy storage system with stepwise input of power according to the present invention with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Referring to fig. 1, the present embodiment provides a echelon utilization energy storage system with power being input step by step, which includes a multi-stage power conversion device 1, a battery management device 2, a data processing device 3, and a monitoring device 4.
The multi-stage power conversion apparatus 1 includes n power conversion sub-apparatuses 101 capable of operating independently, and each power conversion sub-apparatus 101 includes a stepped battery pack and a corresponding power converter (energy storage converter), please refer to fig. 2.
The power conversion sub-devices 101 are connected in parallel, and may be used individually or cooperatively. Each power conversion sub-device 101 is used as a stage of the energy storage system power unit which can be put into use stage by stage, and the rated power of the power conversion sub-device 101 is set as Sm(m is 1, 2, … …, n-1, n), the maximum power that the multistage power conversion device 1 can output is SGeneral assembly＝n*Sm＝S1+S2+……+Sn-1+Sn。
In a single power conversion sub-device 101, the batteries in the echelon battery pack need to be kept consistent in model specification, and between different power conversion sub-devices 101, the batteries in the echelon battery pack can adopt batteries with different specifications, different models, different brands and different types, but the maximum output power of each power conversion sub-device 101 needs to be the same. Therefore, the requirement of the energy storage system can be met, and the compatibility and maintainability are better.
The battery management device 2 is used for detecting the voltage and current of the echelon battery pack in each power conversion sub-device 101 and the voltage and temperature of a single battery in real time, acquiring the state of each echelon battery pack, judging whether a battery fault occurs, and if so, performing corresponding protection operation. If the power conversion sub-device 101 with fault is switched out through the relay, the operation is stopped; or to protect the battery pack in situ.
The data processing device 3 is used for acquiring the voltage, the current and the power of the power grid bus in real time, judging the working state of the power grid, predicting the power demand of the power grid bus in a future time period and reporting the power demand to the monitoring device 4; and the functions of data acquisition, information arrangement and summarization, alarm prompt, analysis and diagnosis and the like are completed by acquiring data such as voltage, current, power and the like of the power grid.
The monitoring device 4 compares the power demand of the bus in the future time period sent by the data processing device 3 with a preset power threshold, makes a directional judgment on the power, and sends a control instruction to control the operation state and the power direction of each power conversion sub-device 101 in the multi-stage power conversion device 1 according to the judgment result.
Wherein the determining of the directionality of power by the monitoring device 4 includes:
setting the power demand as S, the power threshold as S', and the rated power of the single power conversion sub-device as SeThen, when S-S'>SeWhen it is determined that power is to be output, a discharge command is transmitted to the multistage power conversion device 1;
when is-Se<S-S'<SeIf so, determining the state as a standby state;
when S' -S>SeWhen it is determined that the power is absorbed, a charging command is transmitted to multi-stage power conversion device 1.
Specifically, when S-S'>m*SeWhen the power conversion device 1 is in use, the monitoring device 4 sends a command that m power conversion sub-devices 101 are required to discharge to the multi-stage power conversion device 1, wherein m is less than or equal to n; the battery management device 2 selects a target power conversion sub-device to discharge and output power according to the state of each echelon battery pack.
For example, in a certain application scenario, the rated power of the power conversion sub-device 101 is Se50 kw. Through earlier investigation, the average load of the application is 320kw, the peak value of the load is 534kw, the low valley of the load is 102kw, the trend is stable, and the occurrence time of the peak and the valley is fixed at noon and midnight. The preset power threshold S' may be set to 320 kw. And collecting data such as voltage, current and power of the power grid every 5min, and calculating to obtain the power demand S of the bus in the next 5 min.
When S is between 270kw and 370kw, the power conversion sub-device 101 is not required to participate in the work, and the energy storage system is in a standby state.
When S is 380kw, over S'60kw, more than one SeThen 1 power conversion sub-device 101 is needed to operate, and the energy storage system is in a discharge state.
When S is 480kw, over S'160kw, more than three SeThen 3 power conversion sub-devices 101 are needed to operate.
Similarly, when S is 210kw, below S'110kw, there are less than two SeThen can haveThe 2 power conversion sub-devices 101 are charged and the energy storage system is in a charging state.
By the control algorithm, the input number of the power conversion sub-devices can be flexibly controlled, so that the output power of the power converter is controlled, and the effect of gradual input is achieved.
Further, when the battery management device 2 detects that the temperature of the gradient battery pack in a certain operating power conversion sub-device is higher than that of other operating power conversion sub-devices, or the current of the gradient battery pack in a certain operating power conversion sub-device is lower than that of other operating power conversion sub-devices, the operation of the power conversion sub-device is stopped, and the power conversion sub-device is switched to the power conversion sub-device which is not currently in operation.
For example, in a certain application scenario, the multi-stage power conversion apparatus 1 has 10 power conversion sub-apparatuses 101 in total, as denoted by S1、S2、S3…S9、S10. At a certain moment, the power demand signal S-S ═ 8 × SeI.e. a total of 8 power conversion sub-devices 101 are required to operate. Before this time, the battery management device 2 detects a power conversion sub-device (e.g., S)5) Longer operation time, higher temperature than other power conversion sub-devices, and power conversion sub-devices (e.g. S)8) The output current of (2) is small and the voltage is high. So that the two power conversion sub-devices (S)5、S8) The other 8 power conversion sub-devices are put into operation, while they are not put into operation for the moment. During operation, S1The sub-device has a fault and can not continue to work, and can be switched out in time to wake up S5Substitution S1And the operation is continued.
The working process of the echelon utilization energy storage system with the power capable of being input step by step is briefly introduced as follows:
in practical application, please refer to fig. 1, the energy storage system is connected to a distribution network bus 5, and when the energy storage system works, the data processing device 3 first judges the current working state and predicts the power demand of the bus in a future time period by collecting data (voltage, current, power, etc.) of the power network and the bus, and reports the data to the monitoring device 4. The monitoring device 4 compares the reported power demand with an internally predicted power threshold, and makes a power directivity decision (i.e., whether to send out power or absorb power) according to the comparison result. The monitoring device 4 sends a discharging or charging command to the multi-stage power conversion device 1 in conjunction with the battery state fed back from the battery management device 2, and controls the operation state and power direction of each power conversion sub-device 101.
Each power conversion sub-apparatus 101 may operate together, or may operate partially or rest partially. However, it should be noted that the power directions of the energy storage converters of the power conversion sub-devices 101 working together at the same time must be consistent. I.e. either simultaneously from the grid side to the battery side or simultaneously from the battery side to the grid side.
In practical application, the echelon utilization energy storage system that the power in this embodiment can be put into step by step can cooperate with the power supply system and the power consumption load of location each other, and when the power consumption load is few and the power consumption is with low costs, get the electricity from power supply system. When the electric load is large and the cost of electricity is high, the electricity is discharged to the electric load. And the echelon utilization energy storage system has a larger ratio of the echelon battery loading capacity to the power converter. For example, in a certain application scenario, the power of a single power conversion sub-device is 50kw, and the stepped battery of the multi-stage power conversion device 1 can be configured to 200kwh, so that the maximum discharge rate is only 0.25C. Therefore, the requirement on the discharge rate of the battery can be reduced, and the safety of the energy storage system is enhanced.
In addition, due to the configuration of the power conversion sub-device, the whole echelon utilization energy storage system has convenient maintainability and flexible capacity expansion. Each power conversion sub-device is provided with a relatively independent battery pack and a power converter, if a certain group of batteries has faults, the corresponding power conversion sub-device is disconnected from the system and replaced, and the normal work of other power conversion sub-devices is not influenced. When the load capacity requirement changes, the subsystems with corresponding capacity are added or removed on the bus, so that the method is convenient and quick, can reduce a lot of troubles in the aspect of technical design, and is beneficial to large-scale use and popularization.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. A echelon utilization energy storage system with power capable of being input step by step is characterized by comprising a multistage power conversion device, a battery management device, a data processing device and a monitoring device;
the multistage power conversion device comprises n power conversion sub-devices capable of independently working, wherein each power conversion sub-device comprises a echelon battery pack and a corresponding power converter;
the battery management device is used for detecting the voltage and the current of the echelon battery pack in the power conversion sub-device and the voltage and the temperature of a single battery in real time, acquiring the state of each echelon battery pack, judging whether a battery fault occurs or not, and if so, performing corresponding protection operation;
the data processing device is used for acquiring the voltage, the current and the power of the power grid bus in real time, judging the working state of the power grid, predicting the power demand of the power grid bus in a future time period and reporting the power demand to the monitoring device;
and the monitoring device compares the power demand with a preset power threshold value, makes directional judgment on power, and sends a control instruction to control the running state and the power direction of each power conversion sub-device in the multistage power conversion device according to a judgment result.
2. The step-wise power scalable energy storage system of claim 1, wherein the monitoring device making directional determinations of power comprises:
setting the power demand as S, the power threshold as S', and the rated power of the single power conversion sub-device as SeThen, when S-S'>SeWhen it is determined that the power is generated, a discharge finger is transmitted to the multistage power conversion deviceOrder;
when is-Se<S-S'<SeIf so, determining the state as a standby state;
when S' -S>SeWhen the power is absorbed, the power is determined and a charging command is transmitted to the multistage power conversion device.
3. The echelon utilization energy storage system with progressively input power of claim 2, wherein when S-S'>m*SeWhen the power conversion device is used, the monitoring device sends a command that m power conversion sub-devices are required to discharge to the multi-stage power conversion device, and m is less than or equal to n;
and the battery management device selects a target power conversion sub-device to discharge and output power according to the state of each echelon battery pack.
4. The echelon utilization energy storage system in which power can be gradually input as claimed in claim 3, wherein when the battery management device detects that the temperature of the echelon battery pack in a certain operating power conversion sub-device is higher than that of the other operating power conversion sub-devices or that the current of the echelon battery pack in a certain operating power conversion sub-device is lower than that of the other operating power conversion sub-devices, the operation of the power conversion sub-device is stopped and the power conversion sub-device which is not currently in operation is switched to.
5. The echelon utilization energy storage system capable of inputting power step by step as claimed in any one of claims 1 to 4, wherein the batteries in the echelon battery pack in each power conversion sub-device can adopt batteries with different specifications, different models, different brands and different types, and the maximum output power of each power conversion sub-device is the same.
6. The echelon utilization energy storage system with stepwise input of power as claimed in any one of claims 1 to 4, wherein the power directions of the power conversion sub-devices which are operated together at the same time are the same, i.e. charging from the grid input battery or discharging from the battery input grid.
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Application publication date: 20210903 |