CN115514207A - Energy storage converter, slow start module thereof and contactor adhesion judgment method - Google Patents
Energy storage converter, slow start module thereof and contactor adhesion judgment method Download PDFInfo
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- CN115514207A CN115514207A CN202211156295.2A CN202211156295A CN115514207A CN 115514207 A CN115514207 A CN 115514207A CN 202211156295 A CN202211156295 A CN 202211156295A CN 115514207 A CN115514207 A CN 115514207A
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an energy storage converter, a slow start module thereof and a contactor adhesion judgment method, wherein the slow start module of the energy storage converter is used for connecting a first main contactor with a slow start circuit in parallel and then arranging the first main contactor in any pole transmission branch between a battery pack and the battery side of the energy storage converter, and arranging a second main contactor in the other pole transmission branch between the battery pack and the battery side of the energy storage converter; the slow starting module of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the condition that any main contactor fails to break due to failure can be prevented, and the safety of the energy storage converter is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an energy storage converter and a method for judging adhesion of a slow start module and a contactor of the energy storage converter.
Background
In practical applications, because the dc side of the PCS is connected to the battery pack, and the battery pack is equivalent to a constant voltage source without a slow start characteristic, a slow start circuit is usually added in front of a bus capacitor in order to prevent the dc circuit device in the PCS from being damaged by an instantaneous impact current generated by switching the battery pack, thereby protecting the dc circuit.
In the operation process of the PCS, if the PCS fails, the physical connection between the battery pack and the PCS needs to be cut off; however, if the contactor between the PCS and the battery pack fails and is stuck, the corresponding cut-off function cannot be realized, and the safety of the energy storage system is low.
Therefore, a slow start scheme for an energy storage converter is needed to improve the safety of an energy storage system.
Disclosure of Invention
In view of this, the invention provides an energy storage converter, a slow start module thereof and a method for judging contactor adhesion, so as to improve the safety of an energy storage system.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a slow start module of an energy storage converter in a first aspect, which comprises: the system comprises a first main contactor, a second main contactor and a slow start circuit; wherein the content of the first and second substances,
the first main contactor is connected with the slow starting circuit in parallel;
the first main contactor is arranged in any pole transmission branch between the battery pack and the battery side of the energy storage converter;
the second main contactor is arranged in the other pole transmission branch between the battery pack and the battery side of the energy storage converter.
Optionally, the slow start circuit includes: slowly starting the contactor and the resistor; wherein the content of the first and second substances,
the slow-start contactor is connected with the slow-start resistor in series.
Optionally, the first main contactor is disposed in a positive transmission branch between the battery pack and the battery side of the energy storage converter.
The second aspect of the present invention further provides a method for determining adhesion of a contactor of an energy storage converter, which is applied to a controller of the energy storage converter, wherein the controller is used for controlling a slow start module of the energy storage converter according to any one of the first aspect; the contactor adhesion judging method comprises the following steps:
controlling the switching-in of a slow start circuit in the slow start module;
judging whether a second main contactor in the slow starting module is adhered or not according to the detection value of the bus voltage in the energy storage converter;
and under the condition that the branch where the second main contactor is located is conducted, judging whether the first main contactor in the slow start module is adhered or not according to the detection value of the bus voltage.
Optionally, according to the detected value of bus voltage in the energy storage converter, judge whether the second main contactor in the slow start module is adhered to each other, include:
judging whether the detection value is smaller than a first preset voltage or not;
if the detection value is smaller than the first preset voltage, judging that the second main contactor is not adhered;
and if the detection value is not less than the first preset voltage, judging that the second main contactor is adhered.
Optionally, when the branch where the second main contactor is located is turned on, the following steps are performed: judging the condition that the second main contactor is stuck;
according to bus voltage's detected value, judge whether take place to glue even in the first main contactor among the slow start module, include:
judging whether the detection value is equal to the voltage of the battery pack;
if the detected value is equal to the battery pack voltage, determining that the first main contactor is adhered;
and if the detected value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
Optionally, under the condition that the branch circuit where the second main contactor is located is turned on, according to the detection value of the bus voltage, it is determined whether the first main contactor in the slow start module is adhered to the first main contactor, including:
controlling the second main contactor to be conducted;
judging whether the detection value is equal to the voltage of the battery pack;
if the detected value is equal to the battery pack voltage, determining that the first main contactor is adhered;
and if the detected value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
Optionally, after judging whether the first main contactor in the slow start module is adhered to the first main contactor according to the detected value of the bus voltage, the method further includes:
controlling the slow start circuit to be switched out;
and judging whether the slow-start contactor in the slow-start circuit is adhered or not according to the detection value of the bus voltage.
Optionally, according to bus voltage's detected value, judge slowly open contactor among the circuit and whether take place the adhesion, include:
judging whether the detection value is smaller than a second preset voltage or not;
if the detection value is smaller than the second preset voltage, judging that the slowly-started contactor is not adhered;
and if the detected value is larger than or equal to the second preset voltage, judging that the slow-opening contactor is adhered.
Optionally, the method further includes:
and if the contactors are not adhered, controlling the energy storage converter to normally start.
Optionally, the method further includes:
and when the adhesion of any contactor is judged, outputting a contactor adhesion fault alarm signal.
Optionally, after controlling each contactor action, before according to the detected value of bus voltage, judging whether corresponding contactor takes place to glue, still include:
and waiting for a preset time length.
The third aspect of the present invention further provides an energy storage converter, including: a controller, a DC/AC conversion circuit, a bus capacitor and a slow start module of the energy storage converter according to any of the first aspects; wherein, the first and the second end of the pipe are connected with each other,
the bus capacitor is arranged between the positive electrode and the negative electrode of the direct current side of the DC/AC conversion circuit;
the DC/AC conversion circuit and the slow start module are both controlled by the controller;
the controller is configured to execute the method for determining the contactor adhesion of the energy storage converter according to any one of the second aspects.
Optionally, the method further includes: a DC/DC conversion circuit;
the bus side of the DC/DC conversion circuit is connected with the direct current side of the DC/AC conversion circuit;
the battery side of the DC/DC conversion circuit is connected with the positive electrode and the negative electrode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
Optionally, the method further includes: at least one DC/DC conversion circuit and the slow start module thereof;
the bus side of each DC/DC conversion circuit is connected with the direct current side of the DC/AC conversion circuit;
the battery side of each DC/DC conversion circuit is respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start module;
each DC/DC conversion circuit is controlled by the controller.
According to the slow start module of the energy storage converter, after the first main contactor is connected with the slow start circuit in parallel, the first main contactor is arranged in any pole transmission branch between the battery pack and the battery side of the energy storage converter, and the second main contactor is arranged in the other pole transmission branch between the battery pack and the battery side of the energy storage converter; the slow starting module of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the condition that any main contactor fails to break due to failure can be prevented, and the safety of the energy storage converter is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an energy storage converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an energy storage converter according to an embodiment of the present invention;
fig. 3 and fig. 4 are schematic diagrams of two other specific structures of the energy storage converter provided by the embodiment of the invention;
fig. 5 is a flowchart of a method for determining contactor adhesion of an energy storage converter according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a method for determining the adhesion of the contactor of the energy storage converter according to an embodiment of the present invention;
fig. 7 is another flowchart of a method for determining contactor adhesion of an energy storage converter according to an embodiment of the present invention;
fig. 8 and 9 are two specific flowcharts of a method for determining contactor adhesion of an energy storage converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The invention provides a slow start module of an energy storage converter, which is used for improving the safety of an energy storage system.
As shown in fig. 1, the slow start module 01 of the energy storage converter specifically includes: the system comprises a first main contactor K1, a second main contactor K2 and a slow start circuit 10; wherein:
the first main contactor K1 is connected with the slow starting circuit 10 in parallel; the first main contactor K1 is arranged in any pole transmission branch between the battery pack and the battery side of the energy storage converter; the second main contactor K2 is arranged in the other pole transmission branch between the battery pack and the battery side of the energy storage converter.
It should be noted that, as shown in fig. 1, the slow start circuit 10 may be disposed in the positive transmission branch between the battery pack and the battery side of the energy storage converter, but the practical application is not limited thereto, and it may also be disposed in the negative transmission branch between the battery pack and the battery side of the energy storage converter as long as it and the second main contactor K2 are disposed in different pole transmission branches, which is within the protection scope of the present application depending on the practical application environment.
In practical applications, the slow start circuit 10 may be as shown in fig. 2, and includes: a slow starting contactor K3 and a slow starting resistor R1; the slow starting contactor K3 is connected with the first main contactor K1 in parallel after being connected with the slow starting resistor R1 in series.
The specific working principle is as follows:
when the energy storage converter needs to be started slowly or limited in current, the second main contactor K2 and the slow starting contactor K3 are closed, and the current in the transmission branch is limited through a slow starting resistor R1; after the slow start is finished, the first main contactor K1 is closed, the slow start contactor K3 is disconnected, and the second contactor K2 is kept closed, so that the energy storage converter can normally work.
In practical application, when the energy storage converter fails and the physical connection between the energy storage converter and the battery pack needs to be disconnected, the first main contactor K1 can be selectively disconnected, the second main contactor K2 can be selectively disconnected, the first main contactor K1 and the second main contactor K2 can be simultaneously disconnected, and the disconnection method and the disconnection device are determined according to specific application environments and are within the protection range of the application; even if one of the main contactors has a sticking fault, the other main contactor can be used for realizing the breaking between the energy storage converter and the battery pack, and the safety of the energy storage converter is improved.
In the slow start module 01 of the energy storage converter provided in this embodiment, after the first main contactor K1 is connected in parallel with the slow start circuit 10, the first main contactor K2 is arranged in any pole transmission branch between the battery pack and the battery side of the energy storage converter, and the second main contactor K1 is arranged in the other pole transmission branch between the battery pack and the battery side of the energy storage converter; that is, the slow starting module 01 of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the condition that any one main contactor fails to break can be prevented, and the safety of the energy storage converter is improved.
It should be noted that, in consideration of the particularity of the energy storage system, in order to prevent the main contactor from being adhered to the energy storage converter when the energy storage system fails, and the physical connection between the battery and the energy storage converter cannot be cut off, there is a scheme in the prior art that a set of symmetrical main contactor and a slow start circuit are added to the negative electrode of the transmission branch. Although the scheme can also improve the safety and reliability of the energy storage converter, the cost of the energy storage system is greatly increased; in the embodiment, only one main contactor is additionally arranged in the other transmission branch of the energy storage converter, so that the safety and the reliability of the energy storage converter are improved, but the cost can be prevented from being greatly increased.
Another embodiment of the present application provides an energy storage converter, as shown in fig. 1 and 2, including: a controller (not shown), a DC/AC conversion circuit 02, bus capacitors (such as C1 and C2 shown in fig. 1 and fig. 2), and a slow start module 01 of the energy storage converter according to the previous embodiment; wherein:
the bus capacitor is arranged between the positive electrode and the negative electrode of the direct current side of the DC/AC conversion circuit 02; in practical application, both the two half bus capacitors C1 and C2 shown in fig. 1 and fig. 2 may be a single capacitor, or may be implemented by connecting a plurality of capacitors in series and in parallel, which is not specifically limited herein, depending on the practical application environment, and is within the protection scope of the present application.
The DC/AC conversion circuit 02 and the slow start module 01 of the energy storage converter are controlled by a controller of the energy storage converter.
In practical applications, a corresponding load switch, such as K4 and K5 shown in fig. 1 and 2, may be disposed between the battery pack and the slow start module 01.
The specific structure and the working principle of the slow-start module 01 may be shown in the above embodiment, and are not described herein again.
According to the energy storage converter provided by the embodiment, the slow starting module 01 is arranged in the transmission branch of the energy storage converter, so that when the bus voltage of the energy storage converter is suddenly changed or the bus is short-circuited, the current can be limited through the slow starting module 01; moreover, due to the arrangement of the bipolar main contactors, the condition that the single main contactor is stuck to cause breaking failure can be avoided, the safety and the reliability of the energy storage converter are improved, the cost of the energy storage converter is increased, and the effect of protecting a direct current loop is achieved.
On the basis of the above embodiment, preferably, as shown in fig. 3, the energy storage converter further includes: a DC/DC conversion circuit 03; wherein:
the bus side of the DC/DC conversion circuit 03 is connected to the DC side of the DC/AC conversion circuit 02; the battery side of the DC/DC conversion circuit 03 is connected with the positive electrode and the negative electrode of the battery pack through a slow start module 01; the DC/DC converter circuit 03 is controlled by a controller of the energy storage converter.
The DC/DC conversion circuit 03 can perform step-up/down conversion of the battery pack voltage so as to satisfy the DC side voltage requirement of the DC/AC conversion circuit 02.
On the basis of the above embodiment, as shown in fig. 4, the energy storage converter further includes: at least one other DC/DC converter circuit 03 and its slow start module 01 of the energy storage converter according to any of the embodiments described above.
In fig. 4, two DC/DC conversion circuits 03 and their slow start modules 01 are shown as an example, and in practical applications, the number of the DC/DC conversion circuits may be more, which depends on the specific application environment, and all of them are within the protection scope of the present application.
The bus side of each DC/DC conversion circuit 03 is connected to the DC side of the DC/AC conversion circuit 02; the battery side of each DC/DC conversion circuit 03 is respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start module 01; each DC/DC conversion circuit 03 is controlled by a controller of the energy storage converter.
The energy storage converter provided by the embodiment adopts the plurality of DC/DC conversion circuits 03 and the slow start module 01 of the energy storage converter to realize the charge-discharge bidirectional conversion function of the plurality of battery packs, and simultaneously plays a role in protecting respective direct current loop due to the addition of the slow start module 01, thereby improving the safety of the energy storage system.
In addition, in order to ensure that the slow start circuit and the main contactor connected in parallel with the slow start circuit can work normally, whether the main contactor is adhered or not needs to be judged, however, the method for judging whether the contactors are adhered or not by the existing energy storage converter is complex in logic and only suitable for being used when a bus capacitor is a membrane capacitor; when the bus capacitor is an electrolytic capacitor, the charging and discharging time of the electrolytic capacitor is long, and the judgment time is long, so the judgment method is not suitable for the condition that the bus capacitor is the electrolytic capacitor.
Therefore, on the basis of the above embodiments, another embodiment of the present application provides a method for determining contactor adhesion of an energy storage converter, which is applied to a controller in the energy storage converter according to any of the above embodiments, where the controller is used to control a slow start module 01 of the energy storage converter.
It is worth to be noted that the initial state of each contactor is an off state; for the specific structure and principle of the slow-start module 01, reference may be made to the above-mentioned embodiments, which are not described herein again.
Referring to fig. 5, the method for judging the adhesion of the contactor of the energy storage converter comprises the following steps:
and S101, controlling the switching-in of a slow starting circuit in the slow starting module.
Referring to fig. 2, the controller of the energy storage converter controls the slow start contactor K3 in the slow start module 01 to close, so that the slow start resistor R1 is connected to a transmission branch between the battery pack and the battery side of the energy storage converter, such as the positive transmission branch shown in fig. 2.
S102, judging whether the second main contactor in the slow starting module is adhered or not according to the detection value of the bus voltage in the energy storage converter.
The determining process may be specifically as shown in fig. 6, and includes:
s301, judging whether the detection value of the bus voltage is smaller than a first preset voltage.
If the detected value is smaller than the first preset voltage, executing step S302; if the detected value is not less than the first preset voltage, step S303 is executed.
S302, judging that the second main contactor is not adhered.
And S303, judging that the second main contactor is adhered.
As shown in fig. 2, for example: if the detection value of the bus voltage is 0V, the transmission branch is not conducted, the second main contactor K2 is not adhered, and the detection value of the bus voltage is smaller than a first preset voltage; if the detection value of the bus voltage is not less than the first preset voltage, the second main contactor K2 is adhered, the transmission branch is conducted, and the slow starting contactor K3 is closed, the slow starting resistor R1 is connected into the positive transmission branch of the battery pack, so that a certain resistance value exists in the transmission branch, and the detection value of the bus voltage is less than the voltage of the battery pack at the moment.
It should be noted that the first predetermined voltage may be any value greater than 0V but less than the voltage of the battery pack, and is not particularly limited herein, depending on the actual application environment, and is within the protection scope of the present application.
S103, under the condition that the branch where the second main contactor is located is conducted, whether the first main contactor in the slow start module is adhered or not is judged according to the detection value of the bus voltage.
The branch where the second main contactor K2 is located is turned on, and there are two cases, one is to determine that the second main contactor K2 is stuck through step S303, and the other is to control the second main contactor K2 to be turned on through the controller, so that the branch where the second main contactor K2 is located (for example, the negative transmission branch shown in fig. 1 and fig. 2) can be turned on.
The determining process may be specifically as shown in fig. 6, and includes:
s401, whether the detection value of the bus voltage is equal to the battery pack voltage or not is judged.
If the detected value is equal to the battery pack voltage, executing step S402; if the detected value is not equal to the battery pack voltage, step S403 is performed.
S402, judging that the first main contactor is adhered.
And S403, judging that the first main contactor is not adhered.
The branch where the second main contactor K2 is located is conducted, the slow starting contactor K3 is conducted, the slow starting resistor R1 is connected into the transmission branch, and a certain resistance value exists in the transmission branch, so that the detection value of the bus voltage is not equal to the voltage of the battery pack; if the detection value of the bus voltage is equal to the battery pack voltage, the first main contactor K1 is adhered, the slow starting resistor R1 is bypassed by the first main contactor K1, and therefore the detection value of the bus voltage is equal to the battery pack voltage.
According to the method for judging the adhesion of the contactors of the energy storage converter, the method for judging the adhesion of the contactors of the slow start circuit 10 of the energy storage converter can realize the adhesion detection of the bipolar main contactor, so that the safety of an energy storage system is improved; the logic is simple, the time consumption is short, the judgment time can be saved even if the bus capacitor is an electrolytic capacitor, and the method is suitable for the scene that the bus capacitor is different from the electrolytic capacitor.
It should be noted that, in the conventional method for determining the adhesion of the contactor of the energy storage converter, no logic determination is made on whether the slow-start contactor K3 is adhered, and in this embodiment, on the basis of the above embodiment, after step S103, the method for determining the adhesion of the contactor of the energy storage converter further includes as shown in fig. 7 (which is illustrated on the basis of fig. 5 as an example):
and S201, controlling the switching-out of the slow start circuit.
Referring to fig. 2, the controller of the energy storage converter controls the slow starting contactor K3 in the slow starting module 01 to be turned off, so that the slow starting resistor R1 cuts out a transmission branch between the battery pack and the battery side of the energy storage converter.
S202, judging whether the slow-start contactor in the slow-start circuit is adhered or not according to the detection value of the bus voltage.
Referring to fig. 2, at this time, the branch where the second main contactor K2 is located is in a conducted state, if the slow start resistor R1 can be switched out in step S201, the bus voltage should drop to 0V, and if the slow start contactor K3 fails to drop correspondingly, it indicates that the slow start contactor K3 is stuck.
The determining process may specifically be as shown in fig. 8, and includes:
s501, judging whether the detection value of the bus voltage is smaller than a second preset voltage.
If the detected value is smaller than the second preset voltage, executing step S502; if the detected value is not less than the second preset voltage, step S503 is executed.
And S502, judging that the slow-start contactor is not adhered.
And S503, judging that the slow-start contactor is adhered.
In practical applications, the second preset voltage may be any value greater than 0V and less than the voltage of the battery pack, and is not specifically limited herein, depending on the practical application environment, and is within the protection scope of the present application. .
According to the method for judging the adhesion of the contactor of the energy storage converter, whether the slow-start contactor K3 is adhered or not is judged according to the detection value of the bus voltage, and the safety and the reliability of an energy storage system are improved; moreover, the method for judging the adhesion of the contactor of the energy storage converter slow start circuit 10 is simple and easy to implement, and the resources of a control signal I/O port are saved.
On the basis of the above embodiment, the method for determining the adhesion of the contactor of the energy storage converter further includes:
(1) And if the contactors are not adhered, controlling the energy storage converter to normally start.
(2) When any contactor is judged to be adhered, a contactor adhesion fault alarm signal is output; this contactor glues trouble alarm signal mainly includes that main contactor glues the trouble and slowly opens the signal that contactor glues the trouble, and this main contactor glues the signal of trouble and can also embody specific trouble main contactor.
When the controller through the energy storage converter judges that any contactor is adhered, the controller outputs a contactor adhesion fault alarm signal, a user can be reminded that the contactor breaks down, and the safety of the energy storage system is improved.
Moreover, after controlling each contactor to operate, before judging whether the corresponding contactor is adhered according to the detection value of the bus voltage, the method for judging the adhesion of the contactor of the energy storage converter may further include: and waiting for a preset time length.
It should be noted that, each preset time period value may be any value, for example: 10 seconds, and in practical application, the method is not limited to the above, and the method is determined according to the specific application environment and is within the protection scope of the application.
At this time, a complete flow chart of the method for judging contactor adhesion is shown in fig. 9, and the method is divided into a main contactor adhesion judging process and a slow-start contactor adhesion judging process, and in each process, after the controller controls each contactor to act, a preset time is waited for, so that after the loop voltage is stabilized, whether the corresponding contactor is adhered or not is judged, and the accuracy of a judging result is improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. The utility model provides a slow start module of energy storage converter which characterized in that includes: the system comprises a first main contactor, a second main contactor and a slow start circuit; wherein the content of the first and second substances,
the first main contactor is connected with the slow starting circuit in parallel;
the first main contactor is arranged in any pole transmission branch between a battery pack and the battery side of the energy storage converter;
the second main contactor is arranged in the other pole transmission branch between the battery pack and the battery side of the energy storage converter.
2. The slow start module of the energy storage converter according to claim 1, wherein the slow start circuit comprises: slowly starting the contactor and the resistor; wherein the content of the first and second substances,
the slow starting contactor is connected with the slow starting resistor in series.
3. The slow start module of the energy storage converter according to claim 1 or 2, wherein the first main contactor is disposed in a positive transmission branch between the battery pack and a battery side of the energy storage converter.
4. A method for judging the adhesion of a contactor of an energy storage converter is characterized by being applied to a controller of the energy storage converter, wherein the controller is used for controlling a slow start module of the energy storage converter according to any one of claims 1 to 3; the method for judging the adhesion of the contactor comprises the following steps:
controlling the switching-in of a slow start circuit in the slow start module;
judging whether a second main contactor in the slow starting module is adhered or not according to the detection value of the bus voltage in the energy storage converter;
and under the condition that the branch where the second main contactor is located is conducted, judging whether the first main contactor in the slow start module is adhered or not according to the detection value of the bus voltage.
5. The method for judging the adhesion of the contactor of the energy storage converter according to claim 4, wherein the step of judging whether the second main contactor in the slow start module is adhered according to the detected value of the bus voltage in the energy storage converter comprises the following steps:
judging whether the detection value is smaller than a first preset voltage or not;
if the detection value is smaller than the first preset voltage, judging that the second main contactor is not adhered;
and if the detection value is not less than the first preset voltage, judging that the second main contactor is adhered.
6. The method for judging the contactor adhesion of the energy storage converter according to claim 5, wherein the condition that the branch where the second main contactor is located is conducted is as follows: judging the condition that the second main contactor is adhered;
according to busbar voltage's detected value, judge whether the adhesion takes place for first main contactor in the module that slowly opens, include:
judging whether the detection value is equal to the voltage of the battery pack;
if the detected value is equal to the battery pack voltage, determining that the first main contactor is adhered;
and if the detected value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
7. The method for judging the contactor adhesion of the energy storage converter according to claim 4, wherein when the branch where the second main contactor is located is turned on, judging whether the first main contactor in the slow start module is adhered according to the detected value of the bus voltage includes:
controlling the second main contactor to be conducted;
judging whether the detection value is equal to the voltage of the battery pack;
if the detected value is equal to the battery pack voltage, determining that the first main contactor is adhered;
and if the detected value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
8. The method for judging the contactor adhesion of the energy storage converter according to claim 4, wherein after judging whether the first main contactor in the slow start module is adhered according to the detected value of the bus voltage, the method further comprises:
controlling the slow start circuit to be switched out;
and judging whether the slow-start contactor in the slow-start circuit is adhered or not according to the detection value of the bus voltage.
9. The method for judging the adhesion of the contactor of the energy storage converter as claimed in claim 8, wherein the step of judging whether the slow start contactor in the slow start circuit is adhered or not according to the detected value of the bus voltage comprises:
judging whether the detection value is smaller than a second preset voltage or not;
if the detection value is smaller than the second preset voltage, judging that the slow-start contactor is not adhered;
and if the detected value is larger than or equal to the second preset voltage, judging that the slow-opening contactor is adhered.
10. A method for determining contactor adhesion of a storage converter according to any of claims 4 to 9, further comprising:
and if the contactors are not adhered, controlling the energy storage converter to normally start.
11. A method for determining contactor adhesion of a storage converter according to any of claims 4 to 9, further comprising:
and when the adhesion of any contactor is judged, outputting a contactor adhesion fault alarm signal.
12. The method for determining the contactor adhesion of the energy storage converter according to any one of claims 4 to 9, wherein after controlling the operation of each contactor, before determining whether the corresponding contactor is adhered according to the detected value of the bus voltage, the method further comprises:
and waiting for a preset time length.
13. An energy storage converter, comprising: a controller, a DC/AC conversion circuit, a bus capacitor and a soft start module of an energy storage converter according to any one of claims 1 to 3; wherein the content of the first and second substances,
the bus capacitor is arranged between the positive electrode and the negative electrode of the direct current side of the DC/AC conversion circuit;
the DC/AC conversion circuit and the slow start module are both controlled by the controller;
the controller is configured to execute the method for determining contactor sticking of a storage converter according to any of claims 4 to 12.
14. The energy storage converter according to claim 13, further comprising: a DC/DC conversion circuit;
the bus side of the DC/DC conversion circuit is connected with the direct current side of the DC/AC conversion circuit;
the battery side of the DC/DC conversion circuit is connected with the positive electrode and the negative electrode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
15. The energy storage converter according to claim 14, further comprising: at least one DC/DC conversion circuit and the slow start module thereof;
the bus side of each DC/DC conversion circuit is connected with the direct current side of the DC/AC conversion circuit;
the battery side of each DC/DC conversion circuit is respectively connected with the anode and the cathode of the corresponding battery pack through the corresponding slow start module;
each DC/DC conversion circuit is controlled by the controller.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211156295.2A CN115514207A (en) | 2022-09-22 | 2022-09-22 | Energy storage converter, slow start module thereof and contactor adhesion judgment method |
| CN202211648940.2A CN116094095A (en) | 2022-09-22 | 2022-12-21 | Energy storage converter, slow start module thereof and contactor adhesion judgment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211156295.2A CN115514207A (en) | 2022-09-22 | 2022-09-22 | Energy storage converter, slow start module thereof and contactor adhesion judgment method |
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| CN115514207A true CN115514207A (en) | 2022-12-23 |
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| CN202211156295.2A Pending CN115514207A (en) | 2022-09-22 | 2022-09-22 | Energy storage converter, slow start module thereof and contactor adhesion judgment method |
| CN202211648940.2A Pending CN116094095A (en) | 2022-09-22 | 2022-12-21 | Energy storage converter, slow start module thereof and contactor adhesion judgment method |
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