CN112510754A - Power battery echelon utilization recombination system - Google Patents
Power battery echelon utilization recombination system Download PDFInfo
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- CN112510754A CN112510754A CN202011280022.XA CN202011280022A CN112510754A CN 112510754 A CN112510754 A CN 112510754A CN 202011280022 A CN202011280022 A CN 202011280022A CN 112510754 A CN112510754 A CN 112510754A
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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
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Abstract
The invention discloses a power battery echelon utilization recombination system, which comprises: at least one medium-low voltage battery, each low-voltage battery is used for outputting direct current medium-low voltage; each first conversion module is correspondingly and electrically connected with one medium-low voltage battery, and is used for converting each direct current medium-low voltage into direct current medium-high voltage; the direct current medium-high voltage is greater than the direct current medium-low voltage; the second conversion module is respectively and electrically connected with each first conversion module and is used for converting the direct-current medium-high voltage into the alternating-current power grid voltage; the high-voltage battery is used for outputting a first direct-current voltage; the first direct current voltage is greater than or equal to the direct current medium-high voltage; the third conversion module is electrically connected with the high-voltage battery and is used for converting the first direct-current voltage into alternating-current power grid voltage. The invention realizes that batteries with different voltages are merged into a power grid so as to enlarge the voltage range of battery access and further enlarge the types of battery access.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery echelon utilization recombination system.
Background
With the development of domestic new energy automobiles, the loading amount of power batteries is increased year by year, and the retired power batteries replaced from the battery automobiles are gradually increased. The retired power battery replaced from the battery car still has high residual capacity, and can be applied to low-speed battery cars, moped cars, direct-current power supplies, micro-grids and other scenes after screening, recombination, grouping and recombination of the retired power battery.
The traditional battery recombination mainly adopts a one-stage conversion topology, the voltage input range of the direct current side of the PCS is generally 600-850V, and the voltage of the retired power battery must be strictly limited in the range, so that the access type of the retired power battery is limited. And because the conversion efficiency and the convenience of engineering are considered, the direct current side is connected into the battery matrix, and the requirement on the consistency of the batteries is high.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power battery echelon utilization recombination system which can enlarge the voltage range of battery pack access and increase the voltage range of the battery pack access so as to adapt to battery modules with different frames.
One embodiment of the invention provides a power battery echelon utilization recombination system, which comprises:
the low-voltage battery is used for outputting direct current low-voltage;
each first conversion module is correspondingly and electrically connected with one of the medium-low voltage batteries, and is used for converting each direct current medium-low voltage into direct current medium-high voltage; the direct current medium-high voltage is greater than the direct current medium-low voltage;
the second conversion module is respectively and electrically connected with each first conversion module and is used for converting the DC medium-high voltage into AC power grid voltage;
a high voltage battery for outputting a first direct current voltage; the first direct current voltage is greater than or equal to the medium-high direct current voltage;
and the third conversion module is electrically connected with the high-voltage battery and used for converting the first direct-current voltage into the alternating-current power grid voltage.
The power battery echelon utilization recombination system provided by the embodiment of the invention at least has the following beneficial effects: the direct-current medium voltage output by the medium-low voltage battery is converted into direct-current medium-high voltage, then the direct-current medium-high voltage is converted into alternating-current power grid voltage, the direct-current medium-high voltage output by the high-voltage battery is directly converted into alternating-current power grid voltage, the alternating-current power grid voltage is output, batteries with various different voltages are merged into a power grid, the voltage range of battery access is enlarged, and the type of battery access is enlarged.
According to another embodiment of the power battery echelon utilization recombination system of the invention, the at least one medium-low voltage battery comprises at least one low-voltage battery, the medium-low direct voltage comprises a second direct voltage, the medium-high direct voltage comprises a third direct voltage, the at least one first conversion module comprises at least one low-voltage conversion module, each low-voltage conversion module is correspondingly electrically connected with one of the low-voltage batteries, and each low-voltage conversion module is used for converting each second direct voltage into the third direct voltage; the second conversion module comprises a first conversion module and a transformation module, the first conversion module is electrically connected with the at least one low-voltage conversion module, the first conversion module is used for converting the third direct-current voltage into alternating-current voltage, the transformation module is electrically connected with the first conversion module, and the transformation module is used for converting the alternating-current voltage into alternating-current power grid voltage.
According to another embodiment of the power battery echelon utilization recombination system of the present invention, the at least one medium-low voltage battery includes at least one medium-voltage battery, the direct current medium-low voltage includes a fourth direct current voltage, the direct current medium-high voltage includes a fifth direct current voltage, the at least one first conversion module further includes at least one medium-voltage conversion module, each medium-voltage conversion module is electrically connected to at least one medium-voltage battery correspondingly, and each medium-voltage conversion module is configured to convert at least one fourth direct current voltage into the fifth direct current voltage; the second conversion module comprises a second variable current conversion module, the second variable current conversion module is electrically connected with the at least one medium voltage conversion module, and the second variable current conversion module is used for converting the fifth direct current voltage into alternating current power grid voltage.
According to another embodiment of the invention, the power battery echelon utilization recombination system comprises at least one first DC/DC converter, each first DC/DC converter is electrically connected with one of the low-voltage batteries, and is used for converting each second direct-current voltage into a third direct-current voltage;
the first variable current conversion module is a first energy storage converter, is connected in parallel with at least one first DC/DC converter, and is configured to convert the third direct current voltage output by any one first DC/DC converter into an alternating current voltage.
According to another embodiment of the invention, the power battery echelon utilization recombination system comprises at least one first DC/DC converter electrically connected to at least one first DC/DC converter, and the at least one first DC/DC converter is used for converting at least one first direct-current voltage into a second direct-current voltage;
the second variable current conversion module is a second energy storage converter, is connected in parallel with the at least one second DC/DC converter, and is configured to convert a fifth direct current voltage output by the at least one second DC/DC converter into an alternating current power grid voltage.
According to another embodiment of the power battery echelon utilization recombination system, the third conversion module comprises a third energy storage converter, and the third energy storage converter is electrically connected with the high-voltage battery and is used for converting the first direct-current voltage into the alternating-current power grid voltage.
According to the power battery echelon utilization recombination system of other embodiments of the present invention, the first DC/DC converter is configured to obtain the second direct-current voltage of the low-voltage battery, and determine that the operating mode is constant-current output or constant-voltage output according to the second direct-current voltage and a preset charging condition.
According to another embodiment of the invention, the power battery echelon utilization recombination system comprises: if the second direct-current voltage does not reach the preset voltage reference value, the current loop plays a role, and the working mode of the first DC/DC converter is constant-current output;
and if the second direct current voltage reaches the preset voltage reference value, the current loop loses the action, and the working mode of the first DC/DC converter is constant voltage output.
According to the power battery echelon utilization recombination system of other embodiments of the invention, the first energy storage converter controls the output alternating-current voltage to be constant by adopting a double closed-loop PI control strategy.
According to other embodiments of the invention, the power battery echelon utilization recombination system comprises: the control strategy of the voltage of the outer ring direct current bus and the control strategy of the inner ring alternating current.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a block diagram of an embodiment of a power battery echelon utilization recombination system according to an embodiment of the invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a power cell echelon utilization recombination system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of another embodiment of a power cell echelon utilization recombination system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of another embodiment of a power cell echelon utilization recombination system in accordance with an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another embodiment of a power battery echelon utilization recombination system in an embodiment of the invention.
Reference numerals: 100. a medium-low voltage battery; 110. a low-voltage battery; 120. a medium voltage battery; 200. a first conversion module; 210. a low voltage conversion module; 211. a first DC/DC converter; 220. a medium voltage conversion module; 221. a second DC/DC converter; 300. a second conversion module; 310. a first variable current conversion module; 311. a first energy storage converter; 320. a voltage transformation module; 330. a second variable current conversion module; 331. a second energy storage converter; 400. a high voltage battery; 500. a third conversion module; 510. and a third energy storage converter.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
After the retired power battery is recombined and integrated, the retired power battery can be applied to scenes such as low-speed electric vehicles, mopeds, direct-current power supplies and micro-grids, and can also be applied to energy storage occasions with good operation environments, relatively mild charging and discharging working conditions and relatively low requirements on battery performance, so that the retired power battery can be utilized in a gradient manner.
In order to realize the large-scale engineering application of the echelon utilization power battery, the battery needs to be sorted, and a qualified battery module is recombined into an energy storage system, so that the requirement of multi-scene application is met.
The conventional access topology is characterized in that due to the one-stage conversion topology, the voltage input range of the energy storage converter is generally 600V-850V, so that the voltage of the retired power battery must be strictly limited in the range, or the voltage of the retired power battery must be strictly limited in the range, and therefore the access types of the retired power battery are limited.
Based on the above, the invention discloses a power battery echelon utilization recombination system, which can expand the voltage range of an accessed battery so as to expand the access types of the battery.
Referring to fig. 1, an embodiment of the invention discloses a power battery echelon utilization recombination system, which includes: at least one middle and low voltage battery 100, at least one first conversion module 200, a second conversion module 300, a high voltage battery 400, and a third conversion module 500. At least one middle and low voltage battery 100, each low voltage battery 110 for outputting a direct current middle and low voltage; each first conversion module 200 is correspondingly electrically connected with one of the medium-low voltage batteries 100, and each first conversion module 200 is used for converting each direct current medium-low voltage into direct current medium-high voltage; the direct current medium-high voltage is greater than the direct current medium-low voltage; the second conversion module 300 is electrically connected to each of the first conversion modules 200, respectively, and is configured to convert a dc medium-high voltage into an ac grid voltage; the high voltage battery 400 is used to output a first direct current voltage; the first direct current voltage is greater than or equal to the direct current medium-high voltage; the third conversion module 500 is electrically connected to the high voltage battery 400 for converting the first direct voltage into an alternating grid voltage.
For the retired battery pack, due to the fact that the disassembling and sorting cost is high, cost and economic benefit factors are considered, the disassembling and sorting do not meet the conditions of the battery core level at present, therefore, only the battery module is actually disassembled and sorted generally, and the trolley battery pack capable of being used by the whole pack or the sorting module with poor consistency can be connected into a power grid through double-stage conversion. For the battery pack with larger capacity, the battery pack can be accessed into a power grid through the parallel expansion of the conversion module. Therefore, the dc medium-low voltage output by the medium-low voltage battery 100 is converted into the dc medium-high voltage through the first conversion module 200 and cannot be directly incorporated into the power grid, and the dc medium-high voltage needs to be converted into the ac power grid voltage through the second conversion module 300, and then the ac power grid voltage is incorporated into the power grid. The ac grid voltage output by the third conversion module 500 for the first dc voltage output by the high voltage battery 400 already reaches the required voltage of the grid, so the ac grid voltage output by the third conversion module 500 can be directly incorporated into the grid. Therefore, the voltage range of the battery incorporated into the power grid is expanded by adopting different configurations according to the battery packs with different voltages, and the range of the battery incorporated into the power grid is expanded.
In some embodiments, referring to fig. 1, fig. 2 and fig. 3, the at least one middle-low voltage battery 100 includes at least one low voltage battery 110, the dc middle-low voltage includes a second dc voltage, the dc middle-high voltage includes a third dc voltage, the at least one first conversion module 200 includes at least one low voltage conversion module 210, each low voltage conversion module 210 is electrically connected to one of the low voltage batteries 110, and each low voltage conversion module 210 is configured to convert each second dc voltage into the third dc voltage; the second converting module 300 includes a first converting module 310 and a transforming module 320, the first converting module 310 is electrically connected to at least one low voltage converting module 210, the first converting module 310 is configured to convert a third dc voltage into an ac voltage, the transforming module 320 is electrically connected to the first converting module 310, and the transforming module 320 is configured to convert the ac voltage into an ac grid voltage.
The low-voltage battery 100 includes the low-voltage battery 110, the second dc voltage output by the low-voltage battery 110 outputs a third dc voltage through the low-voltage conversion module 210, and the third dc voltage is converted into an ac voltage through the first ac conversion module, but the voltage is reduced when the third dc voltage is converted into the ac voltage, so the output ac voltage cannot meet the voltage required by the power grid. The output ac voltage is boosted by the voltage transformation module 320 to obtain an ac grid voltage meeting the grid requirement, so as to realize accurate and stable incorporation of the low-voltage battery 110 into the grid.
Referring to fig. 1 and 2, in some embodiments, the at least one middle-low voltage battery 100 includes at least one middle-low voltage battery 120, the dc middle-low voltage includes a fourth dc voltage, the dc middle-high voltage includes a fifth dc voltage, the at least one first conversion module 200 further includes at least one middle-voltage conversion module 220, each middle-voltage conversion module 220 is electrically connected to the at least one middle-low voltage battery 120, and each middle-voltage conversion module 220 is configured to convert the at least one fourth dc voltage into the fifth dc voltage; the second converting module 300 includes a second variable current converting module 330, the second variable current converting module 330 is electrically connected to the at least one medium voltage converting module 220, and the second variable current converting module 330 is configured to convert the fifth dc voltage into an ac power grid voltage.
The medium-low voltage battery 100 further includes a medium-voltage battery 120 and a low-voltage battery 110, the low-voltage battery 110 performs voltage boosting and current transforming through the low-voltage conversion module 210 and the first current transforming conversion module 310 to obtain an ac voltage, but the output ac voltage does not reach the ac power grid voltage, so the voltage transforming module 320 needs to be arranged to boost the ac voltage into the ac power grid voltage. The voltage of the medium-voltage battery 120 is higher than that of the low-voltage battery 110, so that the medium-voltage battery 120 performs voltage-up conversion and current-conversion to output an ac grid voltage through the medium-voltage conversion module 220 and the second current-conversion module 330, and the output ac grid voltage can be directly incorporated into the grid. Different operating modes are therefore used depending on the different low-voltage battery 110 and medium-voltage battery 120 to output the same ac grid voltage to further extend the access of the different voltage batteries to the grid.
In some embodiments, referring to fig. 2 and 3, the at least one low voltage conversion module 210 includes at least one first DC/DC converter 211, each first DC/DC converter 211 being electrically connected to one of the low voltage batteries 110 for converting each second direct voltage into a third direct voltage; the first variable current converting module 310 is a first energy storage converter 311, connected in parallel to at least one first DC/DC converter 211, and configured to convert a third direct current voltage output by any one of the first DC/DC converters 211 into an alternating current voltage.
The low-voltage batteries 110 are power batteries of a 90-155V low-voltage platform, each low-voltage battery 110 is electrically connected with a first DC/DC converter 211, and each low-voltage battery 110 uniformly boosts the output second direct-current voltage to a third direct-current voltage of a fixed voltage platform. In this embodiment, the third DC voltage is 400V, so the first DC/DC converters 211 boost the low voltage of 90-155V to 400V, and the output terminals of each first DC/DC converter 211 are connected in parallel, and the output terminals of the plurality of first DC/DC converters 211 are connected in parallel with the first energy storage converter 311. The transforming module 320 is a power frequency transformer, and the power frequency transformer is connected to the first energy storage converter 311 to boost the ac voltage output by the first energy storage converter 311 to output an ac grid voltage. The first energy storage converter 311 converts the 400V third DC voltage output by the first DC/DC converter 211 into 150V ac voltage, and then boosts the 150V ac voltage to 380V ac grid voltage through the power frequency transformer for being connected to the grid. By independently configuring each low-voltage battery 110 with one first DC/DC converter 211, parameters of specific DC/DC converters can be configured according to differences among the low-voltage batteries 110, so that each power battery can work at the maximum charge-discharge efficiency, and the conversion efficiency of the system is improved. And when a battery failure occurs in the system at the same time, the corresponding first DC/DC converter 211 exits the operation mode, and the remaining battery systems can still operate normally, thereby improving the reliability of the system.
The first energy storage converter 311 is connected to the plurality of first DC/DC converters 211, and the first DC/DC converters 211 all operate in the voltage outer loop, and in the current inner loop mode, when the converter operates in the idle mode, the plurality of first DC/DC converters 211 compete autonomously, and the output third DC voltage is controlled at 400V. The first energy storage converter 311 realizes that the first energy storage converter 311 converts the output voltage of each first DC/DC converter 211 independently by the autonomous competition of the first DC/DC converters 211, so that the first energy storage converter 311 is connected with only one first DC/DC converter 211 at a time. Since the low voltage battery 110 is a less consistent battery, the first DC/DC converters 211 are not affected by each other by being connected individually, so as to improve the reliability of the system.
In this embodiment, three low-voltage batteries 110 are provided, three corresponding first DC/DC converters 211 are provided, each first DC/DC converter 211 is connected to one low-voltage battery 110, the low-voltage battery 110 outputs a second DC voltage of 144V, the first DC/DC converter 211 converts and boosts the voltage of 144V to output a third DC voltage of 400V, but the three first DC/DC converters 211 are connected to the first energy storage converter 311 in an autonomous competition manner, and when the voltage of any one first DC/DC converter 211 is obtained and 400V is output in a constant voltage manner, the first energy storage converter 311 receives the third DC voltage of 400V and converts the third DC voltage of 400V to an ac voltage of 150V, the power frequency transformer receives the ac voltage of 150V and boosts the ac voltage to output an ac grid voltage of 380V, and an ac grid voltage of 380V is incorporated into the grid.
In some embodiments, the first DC/DC converter 211 is configured to obtain a second DC voltage of the low-voltage battery 110, and determine the operation mode to be a constant-current output or a constant-voltage output according to the second DC voltage and a preset charging condition.
The first DC/DC converter 211 is connected with the low-voltage battery 110 with the voltage value of 90-155V, and the parameters of each first DC/DC converter 211 are different and need to be determined according to the low-voltage battery 110 output by the low-voltage battery 110. The voltage value output by the first DC/DC converter 211 needs to be controlled at 400V, so the first DC/DC converter 211 needs to determine the operation mode of the first DC/DC converter 211 according to the second DC voltage and the preset charging condition, so that the third DC voltage output by the first DC/DC converter 211 is controlled at 400V.
Wherein, the preset charging condition is as follows: if the second direct-current voltage does not reach the preset voltage reference value, the current loop plays a role, and the first DC/DC converter 211 works in a constant-current output mode; if the second DC voltage reaches the preset voltage reference value, the current loop is disabled, and the first DC/DC converter 211 operates in a constant voltage output mode. By setting the preset voltage reference value, in the initial charging period, if the second DC voltage output by the low-voltage battery 110 does not reach the preset voltage reference value, the current loop functions, and the first DC/DC converter 211 operates in a constant current. At the end of charging, the second DC voltage output by the low-voltage battery 110 reaches the preset voltage reference value, at this time, the voltage loop starts to function, the output second DC voltage is limited, and the current loop is disabled, so that the first DC/DC converter 211 outputs a constant voltage, and it is ensured that the third DC voltage output by the first DC/DC converter 211 is controlled at 400V, so as to facilitate the control of the subsequent first energy storage converter 311.
In some embodiments, the first energy storage converter 311 controls the output ac voltage to be constant by using a dual closed loop PI control strategy.
Since the power frequency transformer needs to output 380V stable ac grid voltage, the ac voltage output by the first energy storage converter 311 needs to be controlled at 150V, so that the first energy storage converter 311 is controlled by using a double closed-loop control strategy to ensure that the power frequency transformer finally outputs 380V ac grid voltage.
The double closed loop PI control strategy comprises the following steps: the control strategy of the voltage of the outer ring direct current bus and the control strategy of the inner ring alternating current.
The outer-loop direct-current bus voltage control strategy mainly maintains the stability of the direct-current bus voltage, and the inner-loop alternating-current control loop realizes the rapid tracking of the network-side current on the command current. The direct current bus voltage signal passes through the voltage PI regulator to obtain a grid-connected current reference signal, and the grid-connected current reference signal is compared with the actual grid current signal, and a PWM signal is output through the current PI regulator to obtain a switching signal of the first energy storage converter 311. Therefore, the output voltage of the power frequency transformer can be controlled to be 380V by the first energy storage converter 311 according to an outer ring direct current bus voltage control strategy and an inner ring alternating current control strategy.
The power battery is dispatched by an EMS through a recombination system in a echelon mode, and commands are issued to any one of the first DC/DC converter 211 and the first energy storage converter 311 according to batteries with different voltages so as to control the first DC/DC converter 211 and the first energy storage converter 311 to start. According to the low-voltage battery 110 which is in fault or needs to be repaired, under the state that the system operation is not influenced, the EMS sends a shutdown instruction to the first DC/DC converter 211, and switches off a front-end switch of the first DC/DC converter 211 to carry out maintenance work, and the normal work of other first DC/DC converters 211 is not influenced.
Referring to fig. 2 and 4, in some embodiments, the at least one medium voltage conversion module 220 includes at least one second DC/DC converter 221, the at least one second DC/DC converter 221 being electrically connected to the at least one medium voltage battery 120 for converting at least one fourth DC voltage to a fifth DC voltage; the second variable current conversion module 330 is a second energy storage converter 331, connected in parallel to the at least one second DC/DC converter 221, and configured to convert a fifth direct current voltage output by the at least one second DC/DC converter 221 into an alternating current grid voltage.
The medium-voltage battery 120 is mainly a power battery with a 280-420V voltage platform, and the medium-voltage battery 120 can be connected into a power grid in a parallel expansion mode through the second DC/DC converter 221. Therefore, the medium-voltage battery 120 is electrically connected through the second DC/DC converter 221 to uniformly increase the fourth DC voltage in the interval of 280-420V to the fifth DC voltage of 600V, and then converted into the ac grid voltage through the second energy storage converter 331 and directly fed back to the grid, without the need of a transformer for transformation, so that the medium-voltage battery 120 is merged into the grid to expand the battery access category. And the output end of the second DC/DC converter 221 is connected with the second energy storage converter 331 in parallel, so that the transformer is saved, the energy conversion efficiency is improved and integrated, and the overall conversion efficiency of the system is not less than 85%.
In the present embodiment, three medium voltage batteries 120 are provided, and three second DC/DC converters 221 are provided, each second DC/DC converter 221 is connected to one medium voltage battery 120, and the second DC/DC converters 221 are connected in parallel to the second energy storage converter 331. The second DC/DC converter 221 converts the fourth DC voltage output from the medium-voltage battery 120 at 420V into a fifth DC voltage at 600V. Since the three second DC/DC converters 221 are connected in parallel, the fifth direct-current voltage output by each second DC/DC converter 221 is 600V, the second energy storage converter 331 is connected to the fifth direct-current voltage which is 600V, and then the second energy storage converter 331 converts the 600V direct-current into 380V alternating-current power to be incorporated into the power grid, so that the medium-voltage battery 120 is incorporated into the power grid.
Referring to fig. 2 and 5, in some embodiments, the third conversion module 500 comprises a third energy storage converter 510, the third energy storage converter 510 being electrically connected to the high voltage battery 400 for converting the first direct voltage into an alternating grid voltage.
The high-voltage battery 400 is mainly a power battery with a voltage platform of 450V-720V, and the high-voltage battery 400 with large capacity can be directly connected to a power grid through a single machine topology after being recombined. Therefore, the high-voltage battery 400 is directly connected to the third energy-storage converter 510, and the third energy-storage converter 510 converts the first dc voltage output by the high-voltage battery 400 into an ac grid voltage of 380V and then directly inputs the ac grid voltage into the power grid, so that the high-voltage battery is connected to the power grid.
Referring to fig. 3, 4 and 5, the first DC/DC converter 211, the second DC/DC converter 221, the first energy storage converter 311, the second energy storage converter 331 and the third energy storage converter 510 all use a high frequency switching frequency of 20kHZ or more, so that the size of the heat sink inductor is greatly reduced.
The power battery echelon utilization recombination system according to the embodiment of the invention is described in detail in a specific embodiment with reference to fig. 1 to 5. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Each of the low-voltage batteries 110 is electrically connected to a first DC/DC converter 211, and each of the low-voltage batteries 110 uniformly boosts the output second DC voltage to a third DC voltage of a fixed voltage platform. In this embodiment, the third DC voltage is 400V, so the first DC/DC converters 211 boost the low voltage of 90-155V to 400V, and the output terminals of each first DC/DC converter 211 are connected in parallel, and the output terminals of the plurality of first DC/DC converters 211 are connected in parallel with the first energy storage converter 311. The transforming module 320 is a power frequency transformer, and the power frequency transformer is connected to the first energy storage converter 311 to boost the ac voltage output by the first energy storage converter 311 to output an ac grid voltage. The medium-voltage battery 120 is electrically connected through the second DC/DC converter 221, so that the fourth direct-current voltage in the interval of 280-420V is uniformly increased to be the fifth direct-current voltage of 600V, then the fourth direct-current voltage is converted into alternating-current power grid voltage through the second energy storage converter 331 and directly fed back to the power grid, the voltage transformation is not needed by a transformer, the medium-voltage battery 120 is merged into the power grid, and the battery access type is expanded. The high-voltage battery 400 is directly connected with the third energy storage converter 510, and the third energy storage converter 510 converts the first direct current voltage output by the high-voltage battery 400 into 380V alternating current power grid voltage and then directly inputs the voltage into the power grid, so that the high-voltage battery is connected to the power grid. Therefore, the three power batteries are divided into the low-voltage battery 110, the medium-voltage battery 120 and the high-voltage battery 400, and the batteries with different interval voltages are merged into the power grid by adopting corresponding conversion, current transformation and voltage boosting modes, so that not only the voltage range of the power grid merged into the batteries is expanded, but also the types of the batteries merged into the power grid are expanded.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
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, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. Power battery echelon utilizes reorganization system, its characterized in that includes:
the low-voltage battery is used for outputting direct current low-voltage;
each first conversion module is correspondingly and electrically connected with one of the medium-low voltage batteries, and is used for converting each direct current medium-low voltage into direct current medium-high voltage; the direct current medium-high voltage is greater than the direct current medium-low voltage;
the second conversion module is respectively and electrically connected with each first conversion module and is used for converting the DC medium-high voltage into AC power grid voltage;
a high voltage battery for outputting a first direct current voltage; the first direct current voltage is greater than or equal to the medium-high direct current voltage;
and the third conversion module is electrically connected with the high-voltage battery and used for converting the first direct-current voltage into the alternating-current power grid voltage.
2. The power battery echelon utilization recombination system of claim 1, wherein the at least one medium-low voltage battery comprises at least one low-voltage battery, the medium-low direct voltage comprises a second direct voltage, the medium-high direct voltage comprises a third direct voltage, the at least one first conversion module comprises at least one low-voltage conversion module, each low-voltage conversion module is electrically connected with one of the low-voltage batteries correspondingly, and each low-voltage conversion module is used for converting each second direct voltage into the third direct voltage; the second conversion module comprises a first conversion module and a transformation module, the first conversion module is electrically connected with the at least one low-voltage conversion module, the first conversion module is used for converting the third direct-current voltage into alternating-current voltage, the transformation module is electrically connected with the first conversion module, and the transformation module is used for converting the alternating-current voltage into alternating-current power grid voltage.
3. The power battery echelon utilization recombination system according to claim 1 or 2, wherein the at least one medium-low voltage battery comprises at least one medium-voltage battery, the direct-current medium-low voltage comprises a fourth direct-current voltage, the direct-current medium-high voltage comprises a fifth direct-current voltage, the at least one first conversion module further comprises at least one medium-voltage conversion module, each medium-voltage conversion module is electrically connected with at least one medium-voltage battery correspondingly, and each medium-voltage conversion module is used for converting at least one fourth direct-current voltage into the fifth direct-current voltage; the second conversion module comprises a second variable current conversion module, the second variable current conversion module is electrically connected with the at least one medium voltage conversion module, and the second variable current conversion module is used for converting the fifth direct current voltage into alternating current power grid voltage.
4. The power battery echelon utilization recombination system of claim 2, wherein the at least one low voltage conversion module comprises at least one first DC/DC converter, each of the first DC/DC converters being electrically connected to one of the low voltage batteries for converting each of the second DC voltages into a third DC voltage;
the first variable current conversion module is a first energy storage converter, is connected in parallel with at least one first DC/DC converter, and is configured to convert the third direct current voltage output by any one first DC/DC converter into an alternating current voltage.
5. The power battery echelon utilization recombination system of claim 3, wherein the at least one medium voltage conversion module comprises at least one second DC/DC converter electrically connected to at least one of the medium voltage batteries for converting at least one of the fourth DC voltages to a fifth DC voltage;
the second variable current conversion module is a second energy storage converter, is connected in parallel with the at least one second DC/DC converter, and is configured to convert a fifth direct current voltage output by the at least one second DC/DC converter into an alternating current power grid voltage.
6. The power battery echelon utilization recombination system of claim 1, wherein the third conversion module comprises a third energy storage converter electrically connected to the high voltage battery for converting the first direct current voltage to the alternating current grid voltage.
7. The power battery echelon utilization recombination system of claim 4, wherein the first DC/DC converter is configured to obtain the second DC voltage of the low-voltage battery, and determine a working mode to be constant-current output or constant-voltage output according to the second DC voltage and a preset charging condition.
8. The power battery gradient utilization recombination system of claim 7, wherein the preset charging conditions are as follows: if the second direct-current voltage does not reach the preset voltage reference value, the current loop plays a role, and the working mode of the first DC/DC converter is constant-current output;
and if the second direct current voltage reaches the preset voltage reference value, the current loop loses the action, and the working mode of the first DC/DC converter is constant voltage output.
9. The power battery echelon utilization recombination system of claim 4, wherein the first energy storage converter controls the output AC voltage to be constant using a dual closed loop PI control strategy.
10. The power battery echelon utilization recombination system of claim 9, wherein the dual closed loop PI control strategy comprises: the control strategy of the voltage of the outer ring direct current bus and the control strategy of the inner ring alternating current.
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