CN117134444A - System protection method and terminal based on energy storage converter parallel operation architecture - Google Patents
System protection method and terminal based on energy storage converter parallel operation architecture Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 251
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- 238000004590 computer program Methods 0.000 claims description 24
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- 238000013061 process characterization study Methods 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 101150071172 PCS2 gene Proteins 0.000 description 13
- 101150003196 PCS1 gene Proteins 0.000 description 12
- 101100493726 Phalaenopsis sp. BIBSY212 gene Proteins 0.000 description 12
- 101100030895 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPT4 gene Proteins 0.000 description 12
- 101100028900 Caenorhabditis elegans pcs-1 gene Proteins 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a system protection method and a terminal based on an energy storage converter parallel operation architecture, wherein when the energy storage converter parallel operation architecture is built, the output current value of the energy storage converters is regulated according to a preset current value, so that the problem of overcurrent output of an energy storage system caused by the fact that the output current value of the energy storage converters is larger than the preset current value is avoided, and one-time output protection is realized; when the parallel frame structure of the energy storage converters operates, the energy management system receives the output current value uploaded by the energy storage converters, judges whether the energy storage converters finish the adjustment of the output current value according to the current output current value, and if the adjustment is not finished, the energy management system adjusts the output current value of the energy storage converters again to realize secondary output protection. On the basis of not changing the original communication architecture, the multiple output protection of the system is realized in a system of a plurality of PCSs to a single BMS, and the effect of alternating-current side current capacity expansion is achieved.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a system protection method and a terminal based on an energy storage converter parallel operation architecture.
Background
The existing integrated energy storage cabinet consists of a battery unit, an energy storage converter (PCS), an EMS (Energy Management System ) control unit, a power distribution unit, a fire protection unit, a photovoltaic controller and the like. For the type selection of PCS (Power Conversion System, energy storage converter), it is preferable to charge and discharge the electric cabinet according to a current multiplying power of 0.5C, so that the electric cabinet is in the optimal output efficiency. For example: the PCS is configured for 100kw/200 kwh. However, at present, one energy storage converter cannot meet the actual current demand of an energy storage cabinet.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the system protection method and the terminal based on the energy storage converter parallel operation architecture are provided, and on the basis of not changing the original communication architecture, the overcurrent protection of the system is realized in a system of a plurality of PCSs to a single BMS.
In order to solve the technical problems, the invention adopts the following technical scheme:
a system protection method based on an energy storage converter parallel operation architecture comprises the following steps:
the energy storage converter adjusts an output current value according to a preset current value;
the energy management system receives the output current value and the parallel operation number of the energy storage converter, judges whether the energy storage converter finishes the adjustment response according to the output current value, and adjusts the output current value again according to the parallel operation number if not.
In order to solve the technical problems, the invention adopts another technical scheme that:
a system protection terminal based on an energy storage converter parallel operation architecture comprises an energy storage converter, an energy management system and a battery management system; the energy storage converter comprises a first memory, a first processor and a first computer program stored on the first memory and running on the first processor; the energy management system includes a second memory, a second processor, and a second computer program stored on the second memory and running on the second processor; the battery management system includes a third memory, a third processor, and a third computer program stored on the third memory and running on the third processor; the first processor executes the first computer program to realize the step of realizing the energy storage converter in the system protection method based on the energy storage converter parallel operation architecture;
the second processor executes the second computer program to realize the step of realizing the energy management system in the system protection method based on the energy storage converter parallel operation architecture;
and when the third processor executes the third computer program, the step of realizing the battery management system in the system protection method based on the parallel operation architecture of the energy storage converter is realized.
The invention has the beneficial effects that: when a parallel operation architecture of a plurality of energy storage converters is built, the output current values of the energy storage converters are adjusted according to preset current values, so that the problem of overcurrent output of an energy storage system caused by the fact that the output current values of the plurality of energy storage converters are larger than the preset current values is avoided, and primary output protection is realized; when the parallel frame structure of the energy storage converters operates, the energy management system receives the output current value uploaded by the energy storage converters, judges whether the energy storage converters finish the adjustment of the output current value according to the current output current value, and if the adjustment is not finished, the energy management system adjusts the output current value of the energy storage converters again to realize secondary output protection. On the basis of not changing the original communication architecture, the multiple output protection of the system is realized in a system of a plurality of PCSs to a single BMS, and the effect of alternating-current side current capacity expansion is achieved.
Drawings
Fig. 1 is a flow chart of steps of a system protection method based on an energy storage converter parallel operation architecture disclosed by the invention;
fig. 2 is a flowchart of a method for protecting a system based on an energy storage converter parallel operation architecture according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a system structure based on an energy storage converter parallel operation architecture according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a system communication architecture based on an energy storage converter parallel operation architecture according to an embodiment of the present invention;
fig. 5 is a flowchart of another system protection method based on an energy storage converter parallel operation architecture according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a system protection terminal based on an energy storage converter parallel operation architecture disclosed by the invention;
description of the reference numerals:
1. an energy storage converter; 2. a battery management system; 3. an energy management system; 101. a first memory; 102. a first processor; 201. a second memory; 202. a second processor; 301. a third memory; 302. a third processor; 40. a power grid; 41. a first transformer; 42. an integrated energy storage cabinet; 43. an outdoor DC cabinet; 44. a photovoltaic module; 45. charging piles; 421. a second transformer; 422. a first energy storage converter; 423. a second energy storage converter; 424. an in-cabinet DC component; 425. an electric cabinet.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a system protection method based on an energy storage converter parallel operation architecture, including:
the energy storage converter adjusts an output current value according to a preset current value;
the energy management system receives the output current value and the parallel operation number of the energy storage converter, judges whether the energy storage converter finishes the adjustment response according to the output current value, and adjusts the output current value again according to the parallel operation number if not.
From the above description, the beneficial effects of the invention are as follows: when a parallel operation architecture of a plurality of energy storage converters is built, the output current values of the energy storage converters are adjusted according to preset current values, so that the problem of overcurrent output of an energy storage system caused by the fact that the output current values of the plurality of energy storage converters are larger than the preset current values is avoided, and primary output protection is realized; when the parallel frame structure of the energy storage converters operates, the energy management system receives the output current value uploaded by the energy storage converters, judges whether the energy storage converters finish the adjustment of the output current value according to the current output current value, and if the adjustment is not finished, the energy management system adjusts the output current value of the energy storage converters again to realize secondary output protection. On the basis of not changing the original communication architecture, the multiple output protection of the system is realized in a system of a plurality of PCSs to a single BMS, and the effect of alternating-current side current capacity expansion is achieved.
Further, before the energy storage converter adjusts the output current value according to the preset current value, the energy storage converter includes:
the energy storage converter obtains the maximum current value of the battery management system and the parallel operation number, and calculates the total value of the output current according to the parallel operation number and the output current value;
and the energy storage converter judges whether the total value of the output current is larger than the maximum current value, and if so, the energy storage converter adjusts the output current value according to the preset current value.
As can be seen from the above description, when the energy storage converters determine the total output current value according to the parallel operation number and the output current value, the total output current value is compared with the maximum current value of the battery management system, and if the total output current value is greater than the maximum current value, the risk of overcurrent output of the energy storage system is indicated, so that the total output current value of the energy storage converters needs to be adjusted to be smaller than or equal to the maximum current value, so as to realize a heavy overcurrent protection.
Further, the energy storage converter adjusts the output current value according to a preset current value, including:
the energy storage converter calculates an average current value according to the maximum current value and the parallel operation number;
and the energy storage converter regulates the output current value to the average current value.
As can be seen from the above description, since the maximum current values of the battery management system received by the plurality of energy storage converters are the same during the operation, when the output current values of the energy storage converters are adjusted, the maximum current values are evenly distributed to each energy storage converter for output, so that the output current values of each energy storage converter are unified, errors caused by current differences during the adjustment are avoided, the adjustment flow of the energy storage converters is simplified, and the response efficiency is improved.
Further, before the energy storage converter adjusts the output current value according to the preset current value, the energy storage converter includes:
the battery management system obtains a maximum current value and the parallel operation number, and calculates an average current value according to the maximum current value and the parallel operation number;
and the battery management system marks the average current value as a preset current value and sends the preset current value to the energy storage converter.
As can be seen from the above description, in an alternative manner, a heavy over-current protection may be achieved by adjusting the preset current value uploaded to the energy storage converter by the battery management system. Therefore, the selectivity of the parallel operation scheme of the energy storage converter is expanded, and the flexibility of the overcurrent protection scheme is improved.
Further, the energy management system receives the output current value and the parallel operation number of the energy storage converter, and judges whether the energy storage converter finishes the adjustment response according to the output current value includes:
the energy management system receives the output current value and the parallel operation number of the energy storage converter, simultaneously receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number;
the energy management system judges whether the output current value is smaller than or equal to an average current value, if yes, the energy storage converter is determined to finish adjusting response; otherwise, determining that the energy storage converter does not complete the adjustment response.
As can be seen from the above description, the energy management system can directly control and manage the output current value of the energy storage converter, so that the output current value of the energy storage converter is detected in real time by the energy management system, and when the output current value of the energy storage converter does not meet the average current value, it indicates that the energy storage converter does not respond normally during primary overcurrent protection, i.e. the output current value is not successfully regulated, so that the secondary output protection flow is started, thereby improving the protection effect.
Further, the energy management system readjusting the output current value according to the number of parallel operations includes:
the energy management system receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number;
the energy management system adjusts the output current value to the average current value.
As can be seen from the above description, when the energy storage converter fails to respond normally during the primary overcurrent protection, the energy management system directly controls the output current value of the energy storage converter to enable the output current value to meet the maximum output range of the energy storage system, so as to realize the secondary output protection of the energy storage system by the energy management system.
Further, the energy management system readjusting the output current value according to the number of parallel operations includes:
the energy management system acquires state information of the energy storage converter, updates the parallel operation number of the energy storage converter according to the state information, and transmits the updated parallel operation number to the energy storage converter;
and the energy storage converter calculates an output current total value according to the parallel operation number and the output current value, and executes the step of judging whether the output current total value is larger than the maximum current value.
As can be seen from the above description, in an alternative manner, the energy storage converter may be controlled by the energy management system to adjust again according to the updated parallel operation number, so as to implement secondary output protection.
Further, the energy management system obtains state information of the energy storage converter, and updates the parallel operation number of the energy storage converter according to the state information specifically as follows:
and the energy management system reads the state information of the energy storage converter, counts the number of non-stop states in the energy storage converter according to the state information, and obtains the updated parallel operation number.
As can be seen from the above description, when the output current value of the energy storage converter is too large to cause the energy storage system to output in an overcurrent state, the energy storage converter may take a shutdown operation to reduce the output current; under the condition, the energy management system can acquire the number of the energy storage converters in the non-stop state, so that the output current value of the energy storage converters is redistributed, and the output value of the energy storage converters is improved to the greatest extent under the condition that the overcurrent output of the energy storage system is avoided.
Further, the maximum current value is a maximum allowable charge/discharge current of the battery management system.
From the above description, it is known that the maximum current value is the maximum allowable charge/discharge current to ensure the energy storage system can safely operate and realize the maximum output of the energy storage converter.
Referring to fig. 6, another embodiment of the present invention provides a system protection terminal based on an energy storage converter parallel operation architecture, including an energy storage converter, an energy management system and a battery management system; the energy storage converter comprises a first memory, a first processor and a first computer program stored on the first memory and running on the first processor; the energy management system includes a second memory, a second processor, and a second computer program stored on the second memory and running on the second processor; the battery management system includes a third memory, a third processor, and a third computer program stored on the third memory and running on the third processor; the first processor executes the first computer program to realize the step of realizing the energy storage converter in the system protection method based on the energy storage converter parallel operation architecture;
the second processor executes the second computer program to realize the step of realizing the energy management system in the system protection method based on the energy storage converter parallel operation architecture;
and when the third processor executes the third computer program, the step of realizing the battery management system in the system protection method based on the parallel operation architecture of the energy storage converter is realized.
From the above description, the beneficial effects of the invention are as follows: when a parallel operation architecture of a plurality of energy storage converters is built, the output current values of the energy storage converters are adjusted according to preset current values, so that the problem of overcurrent output of an energy storage system caused by the fact that the output current values of the plurality of energy storage converters are larger than the preset current values is avoided, and primary output protection is realized; when the parallel frame structure of the energy storage converters operates, the energy management system receives the output current value uploaded by the energy storage converters, judges whether the energy storage converters finish the adjustment of the output current value according to the current output current value, and if the adjustment is not finished, the energy management system adjusts the output current value of the energy storage converters again to realize secondary output protection. On the basis of not changing the original communication architecture, the multiple output protection of the system is realized in a system of a plurality of PCSs to a single BMS, and the effect of alternating-current side current capacity expansion is achieved.
The embodiment of the invention provides a system protection method and a terminal based on an energy storage converter parallel architecture, which can be used in an energy storage system with a plurality of PCS parallel architectures, and realize the overcurrent protection of the energy storage system on the basis of not changing the original communication architecture, and the following description is given by a specific embodiment:
referring to fig. 1 to 4, a first embodiment of the present invention is as follows:
a system protection method based on an energy storage converter parallel operation architecture comprises the following steps:
s1, the energy storage converter acquires the maximum current value of the battery management system and the parallel operation number, and calculates the total value of the output current according to the parallel operation number and the output current value.
Specifically, the maximum current value is a maximum allowable charge/discharge current of the battery management system.
In some embodiments, the maximum current value is the maximum current value, i.e., the maximum current value of the battery management system is the maximum allowable charge/discharge current value I of the battery management system Allow for The output current value is an output current value, the total output current value is an output current total value, the number of parallel operation is n, and the number of parallel operation is n, which means that n energy storage converters (PCS 1, PCS2 … … and PCSn) are arranged in the current communication architecture. Wherein the initial output current value of PCS1 is I pcs1 The initial output current values of PCS2 are all I pcs2 And so on. At this time, the total value I of the current is output Total (S) ＝I pcs1 +I pcs2 +……+I pcsn 。
S2, judging whether the total value of the output current is larger than the maximum current value or not by the energy storage converter, and if yes, executing S3; otherwise, the energy storage converter does not need to adjust the output current value.
In some embodiments, each energy storage converter determines whether the total output current value is greater than the maximum current value. Namely PCS1-PCSn all need to judge the total value I of the output current Total (S) Whether or not it is greater than the maximum current value I Allow for 。
S3, the energy storage converter adjusts an output current value according to a preset current value.
Specifically, the step S3 includes:
s31, calculating an average current value by the energy storage converter according to the maximum current value and the parallel operation number;
s32, the energy storage converter adjusts the output current value to the average current value.
In some embodiments, the average current value I Average of Maximum current value I Allow for I of parallel operation number n=1/n Allow for . At this time, the output current values of the energy storage converters PCS1-PCSn are 1/n I Allow for Realizing heavy overcurrent protection, avoiding the risk of overcurrent output of the energy storage system in such a way that I pcs1 +I pcs2 +……+I pcsn Is always less than or equal to I in the whole charge and discharge process Allow for 。
It should be noted that, the steps S1-S3 are executed when a plurality of PCS parallel architectures are built, and PCS software is correspondingly updated after the steps S1-S3 are executed; the step S4 is performed when the plurality of PCS parallel architectures are running.
In this embodiment, the preset current value obtained by the energy storage converter in step S3 is the maximum current value of the Battery Management System (BMS), the maximum current value of the Battery Management System (BMS) is taken as the preset current value, and the average current value is calculated by the energy storage converter (PCS), and then the output current value is adjusted to the average current value.
In this embodiment, an energy storage converter (PCS) is added to the existing integrated energy storage cabinet structure to be connected in parallel with the original energy storage converter (PCS), so that the input/output current of the integrated energy storage cabinet can be doubled. A schematic diagram of a system structure based on an energy storage converter parallel operation architecture is shown in FIG. 3.
That is, the system comprises a first transformer 41, an integrated energy storage cabinet 42 and an outdoor DC cabinet 43, wherein the integrated energy storage cabinet 42 comprises a second transformer 421, a first energy storage converter 422, a second energy storage converter 423, an in-cabinet DC component 424 and an electric cabinet 425; one end of the first transformer 41 is used for connecting the power grid 40, the other end of the first transformer 41 is connected with one end of the second transformer 421, the other end of the second transformer 421 is respectively connected with one end of the first energy storage converter 422 and one end of the second energy storage converter 423, the other end of the first energy storage converter 421 and the other end of the second energy storage converter 423 are respectively connected with one end of the in-cabinet DC component 424, one end of the electric cabinet 425 and one end of the outdoor DC cabinet 43, the other end of the in-cabinet DC component 424 is used for connecting the photovoltaic component 44, and the other end of the outdoor DC cabinet 43 is used for connecting a plurality of charging piles 45.
A system communication architecture diagram based on an energy storage converter parallel operation architecture is shown in FIG. 4. Namely, the communication architecture includes an EMS (energy management system), a PCS1 (first energy storage converter), a PCS2 (second energy storage converter), a BMS (Battery Management System ), and a water chiller. Specifically, the energy storage converters (PCS 1 and PCS 2) and the water cooler are directly connected and communicated with the BMS through ACAN in the CAN1 bus, and the PCS protects the energy storage system according to the information of the BMS; (wherein, BMS and EMS CAN be directly connected and communicated through MCAN in CAN2 bus) and energy storage converters (PCS 1 and PCS 2) and EMS are connected and communicated through serial ports or network ports, RS485-1 and RS485-2 serial ports are shown in FIG. 4, the EMS carries out current scheduling on the PCS, and the current scheduling has less strict requirements on the current output real-time response of the PCS. The BMS includes an MBMU (Master Battery Management Unit, main Battery management Unit) and an SBMU (Slave Battery Management Unit, cluster level Battery management Unit).
The direct connection communication link ensures that PCS receives fault information or maximum permission of BMSXu Chong discharge current I Allow for In the case of (a), a PCS shutdown may be made at a first time or according to I Allow for And the protection action of current following is carried out, so that the PCS output current is always kept within the maximum bearing capacity of the electric cabinet, and the risk of overcurrent is avoided. If the EMS receives the fault information of the BMS or the maximum allowable charge and discharge I Allow for The protection is carried out, and as the real-time response time of EMS communication is longer, the output current of the PCS can not be regulated in a short time, the risk of overcurrent exists, and potential safety hazards are generated for the use of an energy storage system.
When the number of the energy storage converters in the communication architecture is 2, the 2 PCS respectively receive the I of the BMS under the communication architecture Allow for While 2 PCS received I Allow for Are identical, so 2 PCS are all according to I Allow for Current output is carried out, and the output current of the energy storage system is 2*I Allow for There may be an over-current output. For example, the maximum output current values of PCS1 and PCS2 are I PCS1 ＝I PCS2 =140a; when I Allow for ＝280A，I Allow for >I PCS1 And I Allow for >I PCS2 Then two PCS's are output with maximum capability 140A, and the total output current value I of the system PCS1 +I PCS2 =280A does not exceed I Allow for . When I Allow for when=100deg.A, I Allow for <I PCS1 And I Allow for <I PCS2 Then PCS1 and PCS2 perform current following, I PCS1 ＝I PCS2 ＝I Allow for The total output current of the system at this time is I PCS1 +I PCS2 ＝200A>I Allow for =100a, poses a risk of BMS overcurrent output. In the present embodiment, the maximum current value I of the battery management system is obtained in advance by the energy storage converters PCS1 and PCS2 Allow for And the parallel operation number is 2, and the total value I of the current output by the energy storage system is calculated Total (S) If the total value I of the current is present Total (S) Greater than the maximum current value I Allow for Output current value I of PCS1 and PCS2 pcs1 And I pcs2 Are all adjusted to an average current value of 1/2I Allow for Thereby reducing the total value of the output current and avoiding the over-current transmissionAnd (5) outputting.
S4, the energy management system receives the output current value and the parallel operation number of the energy storage converter, judges whether the energy storage converter finishes the adjustment response according to the output current value, and adjusts the output current value again according to the parallel operation number if not.
The output current value of the energy storage converter (PCS) may be controlled by an Energy Management System (EMS). If the energy storage converter (PCS) is regulated in the steps S1-S3, the Energy Management System (EMS) still detects the output current value I of the energy storage converter (PCS) pcs I greater than 1/n Allow for It indicates that the energy storage converter (PCS) does not respond to step S3, i.e. no output current value adjustment is performed. At this time, the double overcurrent protection may be performed by an Energy Management System (EMS).
Specifically, in S4: the energy management system receives the output current value and the parallel operation number of the energy storage converter, and judges whether the energy storage converter finishes the adjustment response according to the output current value comprises the following steps:
s41, the energy management system receives the output current value and the parallel operation number of the energy storage converter, simultaneously receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number.
S42, the energy management system judges whether the output current value is smaller than or equal to an average current value, and if yes, the energy storage converter is determined to finish adjusting response; otherwise, determining that the energy storage converter does not complete the adjustment response.
In an alternative embodiment, in S4: readjusting the output current value according to the number of parallel operations includes:
and S43, the energy management system receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number.
And S44, the energy management system adjusts the output current value to the average current value.
That is, the average current value is directly transmitted to the energy storage converter (PCS) through the Energy Management System (EMS), so that the output current value of the energy storage converter (PCS) is again adjusted.
In another alternative embodiment, in S4: readjusting the output current value according to the number of parallel operations includes:
s43, the energy management system acquires state information of the energy storage converter, updates the parallel operation number of the energy storage converter according to the state information, and transmits the updated parallel operation number to the energy storage converter;
s44, the energy storage converter calculates the total value of the output current according to the parallel operation number and the output current value, and the step S2 is executed.
That is, when the plurality of PCS parallel architectures operate, the PCS may have a situation that shutdown is not allowed, and the Energy Management System (EMS) enables the energy storage converters (PCS) to execute steps S1-S3 again according to the current online parallel operation number by re-issuing the parallel operation number of the energy storage converters (PCS).
Referring to fig. 5, a second embodiment of the present invention is as follows:
a system protection method based on energy storage converter parallel operation architecture is characterized in that the first embodiment is different from the second embodiment in that: the preset current value is an average current value calculated by the battery management system according to the maximum current value and the parallel operation number.
In this embodiment, the method includes:
s1, the battery management system obtains the maximum current value and the parallel operation number, and calculates an average current value according to the maximum current value and the parallel operation number.
S2, the battery management system marks the average current value as a preset current value and sends the preset current value to the energy storage converter.
S3, the energy storage converter adjusts an output current value according to a preset current value.
It should be noted that, the steps S1-S3 are executed when a plurality of PCS parallel architectures are built, and BMS software is correspondingly updated after the steps S1-S3 are executed; the step S4 is performed when the plurality of PCS parallel architectures are running.
In this embodiment, the preset current value obtained by the energy storage converter in step S3 is an average current value calculated by the battery management system according to the maximum current value and the parallel operation number, and the average current value is sent to the energy storage converter (PCS) as the preset current value after the average current value is calculated by the Battery Management System (BMS).
It should be noted that, in the process of actually building the communication architecture, the output current value of the energy storage converter (PCS) may be adjusted by flexibly selecting the method of the first embodiment or the method of the present embodiment according to the difficulty and complexity of modification of the PCS software or the BMS software.
S4, the energy management system receives the output current value and the parallel operation number of the energy storage converter, judges whether the energy storage converter finishes the adjustment response according to the output current value, and adjusts the output current value again according to the parallel operation number if not.
Referring to fig. 6, a third embodiment of the present invention is as follows:
the system protection terminal based on the energy storage converter parallel operation architecture comprises an energy storage converter 1, an energy management system 2 and a battery management system 3; the energy storage converter 1 comprises a first memory 101, a first processor 102 and a first computer program stored on the first memory 101 and running on the first processor 102; the energy management system 2 includes a second memory 201, a second processor 202, and a second computer program stored on the second memory 201 and running on the second processor 202; the battery management system 3 includes a third memory 301, a third processor 302, and a third computer program stored on the third memory 301 and running on the third processor 302; the step of implementing the energy storage converter in the system protection method based on the energy storage converter parallel operation architecture according to the first embodiment or the second embodiment is implemented when the first processor 102 executes the first computer program;
the step of implementing the energy management system in the energy storage converter parallel operation architecture-based system protection method according to the first embodiment or the second embodiment is implemented when the second processor 202 executes the second computer program;
the third processor 302 implements the steps implemented by the battery management system in the system protection method based on the parallel operation architecture of the energy storage converter according to the first embodiment or the second embodiment when executing the third computer program.
In summary, according to the system protection method and the terminal based on the parallel operation architecture of the energy storage converters, when the parallel operation architecture of the energy storage converters is built, the output current value of the energy storage converters is adjusted according to the preset current value, so that the problem that the output current value of the energy storage converters is larger than the preset current value to cause overcurrent output of the energy storage system is avoided, and one-time output protection is realized; when the parallel frame structure of the energy storage converters operates, the energy management system receives the output current value uploaded by the energy storage converters, judges whether the energy storage converters finish the adjustment of the output current value according to the current output current value, and if the adjustment is not finished, the energy management system adjusts the output current value of the energy storage converters again to realize secondary output protection. Based on the original communication architecture is not changed, the PCS parallel operation scheme is flexibly selected according to different requirements of the front end, multiple output protection of the system is realized in a system of a plurality of PCSs to a single BMS, and the effect of alternating-current side current capacity expansion is achieved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (10)
1. The system protection method based on the parallel operation architecture of the energy storage converter is characterized by comprising the following steps of:
the energy storage converter adjusts an output current value according to a preset current value;
the energy management system receives the output current value and the parallel operation number of the energy storage converter, judges whether the energy storage converter finishes the adjustment response according to the output current value, and adjusts the output current value again according to the parallel operation number if not.
2. The system protection method based on the parallel operation architecture of an energy storage converter according to claim 1, wherein before the energy storage converter adjusts the output current value according to the preset current value, the method comprises:
the energy storage converter obtains the maximum current value of the battery management system and the parallel operation number, and calculates the total value of the output current according to the parallel operation number and the output current value;
and the energy storage converter judges whether the total value of the output current is larger than the maximum current value, and if so, the energy storage converter adjusts the output current value according to the preset current value.
3. The system protection method based on the parallel operation architecture of the energy storage converter according to claim 2, wherein the adjusting the output current value of the energy storage converter according to the preset current value comprises:
the energy storage converter calculates an average current value according to the maximum current value and the parallel operation number;
and the energy storage converter regulates the output current value to the average current value.
4. The system protection method based on the parallel operation architecture of an energy storage converter according to claim 1, wherein before the energy storage converter adjusts the output current value according to the preset current value, the method comprises:
the battery management system obtains a maximum current value and the parallel operation number, and calculates an average current value according to the maximum current value and the parallel operation number;
and the battery management system marks the average current value as a preset current value and sends the preset current value to the energy storage converter.
5. The system protection method based on an energy storage converter parallel operation architecture according to claim 1, wherein the energy management system receiving an output current value and a parallel operation number of the energy storage converter, and determining whether the energy storage converter completes an adjustment response according to the output current value comprises:
the energy management system receives the output current value and the parallel operation number of the energy storage converter, simultaneously receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number;
the energy management system judges whether the output current value is smaller than or equal to an average current value, if yes, the energy storage converter is determined to finish adjusting response; otherwise, determining that the energy storage converter does not complete the adjustment response.
6. The system protection method based on energy storage converter parallel operation architecture according to claim 1, wherein the energy management system readjusts the output current value according to the parallel operation number comprises:
the energy management system receives the maximum current value uploaded by the battery management system, and calculates an average current value according to the maximum current value and the parallel operation number;
the energy management system adjusts the output current value to the average current value.
7. The system protection method based on energy storage converter parallel operation architecture according to claim 2, wherein the energy management system readjusting the output current value according to the parallel operation number comprises:
the energy management system acquires state information of the energy storage converter, updates the parallel operation number of the energy storage converter according to the state information, and transmits the updated parallel operation number to the energy storage converter;
and the energy storage converter calculates an output current total value according to the parallel operation number and the output current value, and executes the step of judging whether the output current total value is larger than the maximum current value.
8. The system protection method based on the parallel operation architecture of the energy storage converter according to claim 7, wherein the energy management system obtains state information of the energy storage converter, and updates the parallel operation number of the energy storage converter according to the state information specifically as follows:
and the energy management system reads the state information of the energy storage converter, counts the number of non-stop states in the energy storage converter according to the state information, and obtains the updated parallel operation number.
9. A method of protecting a system based on an energy storage converter parallel operation architecture according to any of claims 2-6, wherein the maximum current value is the maximum allowable charge/discharge current of the battery management system.
10. A system protection terminal based on an energy storage converter parallel operation architecture comprises an energy storage converter, an energy management system and a battery management system; the energy storage converter comprises a first memory, a first processor and a first computer program stored on the first memory and running on the first processor; the energy management system includes a second memory, a second processor, and a second computer program stored on the second memory and running on the second processor; the battery management system includes a third memory, a third processor, and a third computer program stored on the third memory and running on the third processor; the method is characterized in that the first processor executes the first computer program to realize the step of realizing the energy storage converter in the system protection method based on the parallel operation architecture of the energy storage converter according to any one of claims 1-9;
a step of implementing an energy management system in a system protection method based on an energy storage converter parallel operation architecture according to any one of claims 1 to 9 when the second processor executes the second computer program;
the third processor performs the step of implementing the battery management system in the energy storage converter parallel operation architecture-based system protection method according to any one of claims 1 to 9 when executing the third computer program.
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