CN116094095A - 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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- CN116094095A CN116094095A CN202211648940.2A CN202211648940A CN116094095A CN 116094095 A CN116094095 A CN 116094095A CN 202211648940 A CN202211648940 A CN 202211648940A CN 116094095 A CN116094095 A CN 116094095A
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- slow start
- energy storage
- contactor
- storage converter
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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
Abstract
The invention provides an energy storage converter, a slow start module and a contactor adhesion judgment method thereof, wherein the slow start module of the energy storage converter is used for connecting a first main contactor and a slow start circuit in parallel, then arranging the first main contactor in any pole transmission branch between a battery pack and a 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 start module of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the situation that any main contactor fails and cannot be disconnected can be prevented, and the safety of the energy storage converter is improved.
Description
The present application claims priority from chinese patent office, application number 202211156295.2, entitled "energy storage converter and slow start module and contactor adhesion determination method" filed 22 at 2022, 09, and 22, the entire contents of which are incorporated herein by reference.
Technical Field
The invention relates to the technical field of power electronics, in particular to an energy storage converter, a slow start module thereof and a contactor adhesion judgment method.
Background
The PCS (power converter system, energy storage converter) is used for realizing a bidirectional current transforming function for charging and discharging of the battery pack, in practical application, since the battery pack is connected to the dc side of the PCS and is equivalent to a constant voltage source without a slow start characteristic, in order to prevent the damage of the dc loop device in the PCS caused by the impact current at the switching moment of the battery pack, a slow start circuit is usually added in front of the bus capacitor, thereby playing a role in protecting the dc loop.
In the running 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 adhesion occurs, the corresponding cut-off function cannot be realized, resulting in lower safety of the energy storage system.
Therefore, there is a need for a slow start scheme of an energy storage converter to improve the safety of an energy storage system.
Disclosure of Invention
In view of the above, the present invention provides an energy storage converter, a slow start module thereof and a method for determining adhesion of a contactor, so as to improve the safety of an energy storage system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the first aspect of the present invention provides a slow start module of an energy storage converter, comprising: a first main contactor, a second main contactor and a soft start circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
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;
the second main contactor is disposed in another pole transfer leg between the battery pack and the energy storage converter battery side.
Optionally, the slow start circuit includes: a slow start contactor and a slow start resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the slow start contactor and the slow start resistor are connected 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.
Optionally, the method further comprises: at least one further said first main contactor;
each first main contactor is respectively arranged in an anode transmission branch corresponding to the space between the battery pack and the battery side of the energy storage converter; and only one first main contactor is connected with the slow start circuit in parallel in each first main contactor;
the cathodes of the battery packs are connected in parallel.
The invention also provides a contactor adhesion judgment method of the energy storage converter, which is applied to a controller of the energy storage converter, wherein the controller is used for controlling the 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 a slow start circuit in the slow start module to cut in;
judging whether the second main contactor in the slow start 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 circuit where the second main contactor is positioned 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 the bus voltage in the energy storage converter, judging whether the second main contactor in the slow start module is adhered, including:
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 smaller than the first preset voltage, judging that the second main contactor is adhered.
Optionally, the situation that the branch where the second main contactor is located is turned on is: judging the condition of adhesion of the second main contactor;
judging whether the first main contactor in the slow start module is adhered or not according to the detection value of the bus voltage, comprising:
judging whether the detection value is equal to the battery pack voltage;
If the detection value is equal to the battery pack voltage, judging that the first main contactor is adhered;
and if the detection 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 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 detection value of the bus voltage includes:
controlling the second main contactor to be conducted;
judging whether the detection value is equal to the battery pack voltage;
if the detection value is equal to the battery pack voltage, judging that the first main contactor is adhered;
and if the detection value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
Optionally, after determining whether the first main contactor in the slow start module is adhered according to the detection value of the bus voltage, the method further includes:
controlling the slow start circuit to cut out;
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 the detected value of the bus voltage, judging whether the slow start contactor in the slow start circuit is adhered, including:
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 detection value is greater than or equal to the second preset voltage, judging that the slow start contactor is adhered.
Optionally, the method further comprises:
and if the contactors are not adhered, controlling the energy storage converter to start normally.
Optionally, the method further comprises:
when any contactor is judged to be adhered, an adhesion fault alarm signal of the contactor is output.
Optionally, after controlling the actions of the contactors, before judging whether the corresponding contactors are adhered according to the detection value of the bus voltage, the method further includes:
waiting for a preset time period.
The third aspect of the present invention also provides a method for determining adhesion of a contactor of an energy storage converter, which is applied to a control system of the energy storage converter, where the control system 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:
judging whether the first main contactor is adhered or not according to voltage sampling values between two sides of the first main contactor in the slow start module and the other pole of the battery pack;
Controlling a slow start circuit in the slow start module to cut in;
and judging whether the second main contactor in the slow start module is adhered or not according to the detection value of the bus voltage in the energy storage converter.
Optionally, according to the voltage sampling value between two sides of the first main contactor in the slow start module and another pole of the battery pack, judging whether the first main contactor is adhered, including:
judging whether the two voltage sampling values at two sides of the first main contactor are the same or not;
if the two voltage sampling values are the same, the corresponding first main contactor is judged to be adhered;
if the two voltage sampling values are different, the fact that the corresponding first main contactor is not adhered is judged.
Optionally, according to the detected value of the bus voltage in the energy storage converter, judging whether the second main contactor in the slow start module is adhered, including:
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 smaller than the first preset voltage, judging that the second main contactor is adhered.
Optionally, after judging whether the second main contactor in the slow start module is adhered according to the detection value of the bus voltage in the energy storage converter, the method further includes:
controlling the slow start circuit to cut out;
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 the detected value of the bus voltage, judging whether the slow start contactor in the slow start circuit is adhered, including:
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 detection value is greater than or equal to the second preset voltage, judging that the slow start contactor is adhered.
Optionally, the method further comprises: if all the contactors are not adhered, controlling the energy storage converter to start normally; and/or outputting a contactor adhesion fault alarm signal when any contactor is judged to be adhered;
and/or after controlling the action of each contactor, before judging whether the corresponding contactor is adhered according to the detection value of the bus voltage, the method further comprises the following steps: waiting for a preset time period.
The fourth aspect of the present invention also provides an energy storage converter, comprising: the controller, the DC/AC conversion circuit, the bus capacitor and the slow start module of the energy storage converter according to any one of the first aspect; wherein, the liquid crystal display device comprises a liquid crystal display device,
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 controlled by the controller;
the controller is configured to execute the contactor adhesion judgment method of the energy storage converter according to any one of the second aspect.
Optionally, the method further comprises: 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 anode and the cathode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
Optionally, the method further comprises: in addition, 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 sides of the DC/DC conversion circuits are respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start modules;
Each DC/DC conversion circuit is controlled by the controller.
The fifth aspect of the present invention also provides an energy storage converter, comprising: the control system, the DC/AC conversion circuit, the bus capacitor and the slow start module of the energy storage converter according to any one of the first aspect; wherein, the liquid crystal display device comprises a liquid crystal display device,
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 controlled by the control system;
the control system is configured to execute the contactor adhesion judgment method of the energy storage converter according to any one of the third aspect.
Optionally, the method further comprises: 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 anode and the cathode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
Optionally, the method further comprises: in addition, 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 sides of the DC/DC conversion circuits are respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start modules;
Each DC/DC conversion circuit is controlled by the controller.
Optionally, the control system includes: the controller of the energy storage converter and the battery manager are in communication connection with the controller;
the battery manager is used for acquiring voltage sampling values between two sides of a first main contactor in the slow start module and the other pole of the battery pack respectively, and judging whether the first main contactor is adhered or not;
the controller is used for controlling switching of a slow start circuit in the slow start module, acquiring a detection value of bus voltage and judging whether the second main contactor in the slow start module is adhered or not.
Optionally, the method further comprises: and the load switch is arranged in the positive and negative electrode transmission branch at the battery side of the energy storage converter.
Optionally, when the slow start module includes a plurality of first main contactors, one side of each first main contactor is connected to a corresponding battery pack, and the other side of each first main contactor is connected to the corresponding pole of the load switch in parallel.
The slow start module of the energy storage converter is characterized in that a first main contactor is connected with a slow start circuit in parallel and then arranged in any pole transmission branch between a battery pack and the battery side of the energy storage converter, and a 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 start module of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the situation that any main contactor fails and cannot be disconnected 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 following description will briefly explain the embodiments or the drawings to be used in the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
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 is a schematic diagram of another specific structure of an energy storage converter according to an embodiment of the present invention;
fig. 4 and fig. 5 are schematic diagrams of two other specific structures of an energy storage converter according to an embodiment of the present invention;
fig. 6 is a flowchart of a method for determining adhesion of a contactor of an energy storage converter according to an embodiment of the present invention;
fig. 7 is a specific flowchart of a method for determining adhesion of a contactor of an energy storage converter according to an embodiment of the present invention;
fig. 8 is another flowchart of a method for determining adhesion of a contactor of an energy storage converter according to an embodiment of the present invention;
fig. 9 and fig. 10 are two other specific flowcharts of a method for determining adhesion of a contactor of an energy storage converter according to an embodiment of the present invention;
Fig. 11 and fig. 12 are schematic diagrams of two specific structures of a transmission branch between an energy storage converter and a battery pack according to an embodiment of the present invention;
fig. 13 is another flowchart of a method for determining adhesion of a contactor of an energy storage converter according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The invention provides a slow start module of an energy storage converter so as to improve the safety of an energy storage system.
As shown in fig. 1, the slow start module 01 of the energy storage converter specifically includes: 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 start 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 transfer 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 polarity transmission branches, depending on the practical application environment, and all are within the scope of protection of the present application.
In practical applications, the slow start circuit 10 may, as shown in fig. 2, include: a slow start contactor K3 and a slow start resistor R1; the slow start contactor K3 and the slow start resistor R1 are connected in series and then connected in parallel with the first main contactor K1.
The specific working principle is as follows:
when the energy storage converter needs to be slowly started or limited in current, the second main contactor K2 and the slowly started contactor K3 are closed, and the current in the transmission branch is limited through the slowly started resistor R1; after the slow start is finished, the first main contactor K1 is closed, the slow start contactor K3 is opened, and the second contactor K2 is kept closed, so that the energy storage converter can enter normal operation.
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, the second main contactor K2 and both can be disconnected at the same time, and the two can be disconnected according to the specific application environment, and the two are all within the protection scope of the application; even if one of the main contactors has adhesion failure, the breaking between the energy storage converter and the battery pack can be realized through the other main contactor, so that the safety of the energy storage converter is improved.
In the slow start module 01 of the energy storage converter provided by the embodiment, after the first main contactor K1 is connected in parallel with the slow start circuit 10, the slow start module 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 K2 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 start module 01 of the energy storage converter is provided with the main contactors at two poles of the battery pack, so that the situation that any main contactor fails and cannot be disconnected can be prevented, and the safety of the energy storage converter is improved.
It should be noted that, considering the specificity of the energy storage system, in order to prevent the main contactor from being capable of cutting off the physical connection between the battery and the energy storage converter due to adhesion and other reasons when the energy storage system fails, a scheme in the prior art is to add a set of symmetrical main contactor and slow start circuit at the negative pole of the transmission branch. The scheme can also improve the safety and reliability of the energy storage converter, but the cost of the energy storage system is increased greatly; 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 reliability of the energy storage converter are improved, and the large increase in cost can be avoided.
On the basis of the above embodiment, when the battery side of the energy storage converter is connected with multiple battery packs, the slow start module may further include: at least one further first main contactor; each first main contactor is respectively arranged in an anode transmission branch circuit between the corresponding battery pack and the battery side of the energy storage converter, but only one first main contactor in each first main contactor is connected with a slow start circuit in parallel; and the cathodes of the battery packs are connected in parallel, namely the cathodes of the battery sides of the energy storage converter are connected by sharing the same second main contactor K2.
For example, a 0.25C (4 h energy storage system) energy storage converter, and two battery packs (RACK 1 and RACK2 as shown in fig. 3) are connected to the battery side of the energy storage converter, and logic during normal operation is as follows: the buffer starting circuit 10 of the first transmission branch of the positive electrode is used for buffering and charging the bus capacitor (comprising C1 and C2 shown in the figure); after grid connection, the voltage of the bus capacitor is equal to the voltage of a battery port of the battery pack RACK1, and at the moment, the first main contactor K1' in the second transmission branch of the positive electrode is closed, so that no impact current is generated, a slow start circuit in the second transmission branch of the positive electrode can be removed, and the slow start cost of parallel connection of multiple battery packs is saved.
Moreover, in practical application, corresponding load switches, such as K4 and K5 shown in fig. 1 and 2, are usually disposed in the positive and negative transmission branches of the battery pack; when multiple battery packs are coupled in parallel, in order to share the load switches K4 and K5, the first main contactor K1 and the soft start circuit 10, the first main contactor K1' may be disposed between the load switch K4 and the corresponding battery pack, as shown in fig. 3.
For the case of parallel connection of more battery packs, reference may be made to the connection manner of the second battery pack RACK2 shown in fig. 3, which is not described in detail herein.
Another embodiment of the present application provides an energy storage converter, as shown in fig. 1 and 2, including: a controller (not shown in the figures), a DC/AC conversion circuit 02, a bus capacitor (including C1 and C2 shown in fig. 1 and 2), and a slow start module 01 of the energy storage converter according to the above embodiment; wherein:
the bus capacitor is arranged between the anode and the cathode of the direct current side of the DC/AC conversion circuit 02; in practical application, the two half bus capacitors C1 and C2 shown in fig. 1 and fig. 2 may be one capacitor, or may be all implemented by series-parallel connection of a plurality of capacitors, which is not specifically limited herein, and may be within the scope of protection of the present application according to the practical application environment thereof.
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 may be disposed between the battery pack and the slow start module 01, such as K4 and K5 shown in fig. 1 and 2.
The specific structure and working principle of the slow start module 01 can be described in the previous embodiment, and will not be described herein.
According to the energy storage converter provided by the embodiment, the slow start module 01 is arranged in the transmission branch of the energy storage converter, so that when the busbar voltage of the energy storage converter is suddenly changed or the busbar is short-circuited, the current limiting effect can be achieved through the slow start module 01; in addition, the bipolar main contactor can also avoid the condition that the breaking failure is caused by the adhesion failure of the single main contactor, so that the safety and the reliability of the energy storage converter are improved, the cost increase of the energy storage converter is avoided, and the effect of protecting the direct current loop is achieved.
On the basis of the above embodiment, preferably, as shown in fig. 4, 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 anode and the cathode of the battery pack through a slow start module 01; the DC/DC conversion circuit 03 is controlled by a controller of the energy storage converter.
The DC/DC conversion circuit 03 can step-up/down convert the battery voltage so that it can meet the DC-side voltage demand of the DC/AC conversion circuit 02.
On the basis of the above embodiment, as shown in fig. 5, the energy storage converter further includes: in addition, at least one DC/DC conversion circuit 03 and a slow start module 01 of the energy storage converter according to any of the above embodiments are provided.
In fig. 5, two DC/DC conversion circuits 03 and a slow start module 01 thereof are shown as an example, and in practical application, the number of the DC/DC conversion circuits may be more, depending on the specific application environment, and all the DC/DC conversion circuits 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 connected with the anode and the cathode 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 thereof to realize the charge-discharge bidirectional conversion function of the plurality of battery packs, and meanwhile, as the slow start module 01 is respectively added, the protection effect of respective direct current loops is achieved, and the safety of the energy storage system is improved.
In addition, in order to ensure that the slow start circuit and the parallel main contactors thereof can work normally, whether the main contactors are adhered or not needs to be judged, however, the existing method for judging whether the contactors are adhered or not by the energy storage converter has complex logic and is only suitable for the case that the bus capacitor is a film capacitor; when the bus capacitor is an electrolytic capacitor, the method is not suitable for the case that the bus capacitor is an electrolytic capacitor because the electrolytic capacitor is longer in charging and discharging time and longer in judging time.
Therefore, based on the above embodiment, another embodiment of the present application provides a method for determining adhesion of a contactor of an energy storage converter, which is applied to a controller in the energy storage converter according to any one of the above embodiments, where the controller is configured to control a slow start module 01 of the energy storage converter.
It is worth to say that the initial state of each contactor is the disconnection state; the specific structure and principle of the slow start module 01 can be referred to the above embodiments, and will not be described herein.
Referring to fig. 6, the method for determining adhesion of the contactor of the energy storage converter includes:
s101, controlling a slow start circuit in a slow start module to cut in.
Referring to fig. 2, the controller of the energy storage converter controls the slow start contactor K3 in the slow start module 01 to be closed, so that the slow start resistor R1 is connected into a transmission branch between the battery pack and the battery side of the energy storage converter, such as a positive transmission branch shown in fig. 2.
S102, judging whether the second main contactor in the slow start module is adhered or not according to the detection value of the bus voltage in the energy storage converter.
The judging process may specifically be as shown in fig. 7, and includes:
s301, judging whether a detection value of the bus voltage is smaller than a first preset voltage.
If the detection value is smaller than the first preset voltage, step S302 is executed; if the detected value is not less than the first preset voltage, step S303 is performed.
S302, judging that the second main contactor is not adhered.
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 the 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 start resistor R1 is connected into the positive transmission branch of the battery pack due to the closing of the slow start contactor K3, so that a certain resistance exists in the transmission branch, and the detection value of the bus voltage is less than the battery pack voltage.
It should be noted that, the first preset voltage may be any value greater than 0V but less than the battery voltage, which is not limited herein, and is within the scope of protection of the present application depending on the practical application environment.
And S103, 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.
The branch where the second main contactor K2 is located is turned on, and there are two cases, one is that it is determined in step S303 that the second main contactor K2 is adhered, and the other is that the controller controls the second main contactor K2 to be turned on, so that the branch where the second main contactor K2 is located (such as the negative transmission branch shown in fig. 1 and 2) can be turned on.
The judging process may specifically be as shown in fig. 7, and includes:
s401, judging whether the detection value of the bus voltage is equal to the battery pack voltage.
If the detected value is equal to the battery voltage, step S402 is executed; if the detected value is not equal to the battery voltage, step S403 is performed.
S402, judging that the first main contactor is adhered.
S403, judging that the first main contactor is not adhered.
Since the branch where the second main contactor K2 is located is conducted, the slow start contactor K3 is conducted, the slow start resistor R1 is connected into the transmission branch, and a certain resistance value exists in the transmission branch, the detection value of the bus voltage is not equal to the battery pack voltage; if the detected value of the bus voltage is equal to the battery voltage, it indicates that the first main contactor K1 is stuck, and the slow start resistor R1 is bypassed by the first main contactor K1, so that the detected value of the bus voltage is equal to the battery voltage.
According to the contactor adhesion judgment method of the energy storage converter, adhesion detection of the bipolar main contactor can be achieved, and safety of an energy storage system is improved; and the logic is simple, the time consumption is short, and even if the bus capacitor is an electrolytic capacitor, the judgment time can be saved, so that the method is applicable to different scenes that the bus capacitor is a film capacitor and an electrolytic capacitor.
It should be noted that, in the conventional method for determining adhesion of the contactor of the energy storage converter, the logic determination is not made as to whether the slow start contactor K3 is adhered, but in this embodiment, after step S103, the method for determining adhesion of the contactor of the energy storage converter further includes as shown in fig. 8 (shown on the basis of fig. 6):
s201, controlling the slow start circuit to cut out.
Referring to fig. 2, the controller of the energy storage converter controls the slow start contactor K3 in the slow start module 01 to be opened, so that the slow start 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 turned-on state, if step S201 can cut off the slow start resistor R1, the bus voltage should drop to 0V, and if the corresponding drop fails, it indicates that the slow start contactor K3 is stuck.
The judging process may specifically be as shown in fig. 9, including:
s501, judging whether the detection value of the bus voltage is smaller than a second preset voltage.
If the detection value is smaller than the second preset voltage, step S502 is executed; if the detected value is not less than the second preset voltage, step S503 is performed.
S502, judging that the slow start contactor is not adhered.
S503, judging that the slow start contactor is adhered.
In practical applications, the second preset voltage may be any value greater than 0V but less than the battery voltage, which is not limited herein, and may be within the scope of protection of the present application depending on the practical application environment.
According to the contactor adhesion judgment method of the energy storage converter, judgment on whether adhesion occurs to the slow start contactor K3 or not is achieved according to the detection value of the bus voltage, and safety and reliability of an energy storage system are improved; in addition, the adhesion judgment method of the contactor of the energy storage converter slow start circuit 10 is simple and feasible, and the control signal I/O port resource is saved.
Based on the above embodiment, the method for determining 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 start normally.
(2) Outputting a contactor adhesion fault alarm signal when any contactor is judged to be adhered; the contactor adhesion fault alarm signal mainly comprises a main contactor adhesion fault signal and a signal for buffering the contactor adhesion fault signal, and the main contactor adhesion fault signal can also represent a specific fault main contactor.
When the controller of the energy storage converter judges that any contactor is adhered, an adhesion failure alarm signal of the contactor is output, so that a user can be reminded of the failure of the contactor, and the safety of the energy storage system is improved.
After controlling the operation of each contactor, before judging whether the corresponding contactor is adhered according to the detection value of the bus voltage, the contactor adhesion judging method of the energy storage converter may further include: waiting for a preset time period.
It should be noted that, each preset time period may be any value, for example: in practical application, 10 seconds is not limited to this, and it is only required to be within the protection scope of the present application depending on the specific application environment.
At this time, the complete flowchart of the contactor adhesion judgment method is shown in fig. 10, and is divided into a main contactor adhesion judgment process and a slow-start contactor adhesion judgment process, and each process waits for a preset period of time after the controller controls each contactor to act, so that after the loop voltage is stable, whether the corresponding contactor is adhered is judged, and the accuracy of the judgment result is improved.
It should be noted that, in the contactor adhesion judgment logic provided in the above embodiment, there is a risk point that is not identified, namely: before the slow-start contactor K3 is closed, the adhesion condition of the first main contactor K1 cannot be judged. If the first main contactor K1 is stuck, after the slow-up contactor K3 is closed, the second main contactor K2 is normally closed according to the above-mentioned stuck judgment logic. At this time, the first main contactor K1 and the second main contactor K2 are closed at the same time, and there is a risk that the related devices are damaged by the short-circuit impact current.
Accordingly, another embodiment of the present application provides another energy storage converter, as shown in fig. 1 to 3, comprising: a control system (not shown in the figures), a DC/AC conversion circuit 02, a bus capacitor (comprising C1 and C2 shown in figures 1 to 3) and a slow start module 01 of the energy storage converter in the embodiment shown in figures 1 to 3; the structure and the working principle of the DC/AC conversion circuit 02, the bus capacitor and the slow start module 01 can be seen from the above embodiments, and at least one DC/DC conversion circuit 03 can be further arranged in the energy storage converter; the corresponding connection relationship and the working principle can be referred to the above embodiments, and will not be described here again.
Note that, the battery sides of the energy storage converters mentioned in the above embodiments refer to the battery sides of the main circuits in the energy storage converters, such as the DC side of the DC/AC conversion circuit 02 shown in fig. 1 to 3, or the battery sides of the respective DC/DC conversion circuits 03 shown in fig. 4 and 5.
In practical applications, between the battery pack and the battery side of the main circuit, corresponding fuses (such as 04 shown in fig. 11 and 12), current splitters (such as 05 shown in fig. 11 and 12), load switches (such as K4 and K5 shown in fig. 11 and 12) and the like are sequentially arranged in the positive and negative transmission branches; moreover, the load switches K4 and K5 in the positive and negative pole transmission branches of the battery pack may be disposed on one side of the slow start module 01 shown in fig. 1, 2, 4 and 5, which is close to the battery pack, or may be disposed at the positions shown in fig. 3, 11 and 12, that is: the first main contactor K1 (and K1 ') and the slow start circuit 10 are moved to the load switch front stage so as to be located between the load switch and the battery pack, at this time, the load switch K4 is located between the first main contactor K1 (and K1') and the positive electrode of the main circuit battery side, and the load switch K5 is located between the fuse 04 in the negative electrode transmission branch and the second main contactor K2. Taking fig. 12 as an example, when the slow start module 01 includes a plurality of first main contactors K1 and K1', one side of each of the first main contactors K1 and K1' is connected to a corresponding battery pack, and the other side of each of the first main contactors K1 and K1' is connected in parallel to a load switch K4 of a corresponding pole.
Unlike the energy storage converter provided in the above embodiment, the present embodiment integrates the battery manager 102 inside the control system, so that the control system includes not only the original controller (such as the ARM/DSP described above in fig. 11 and 12) 101, but also the battery manager 102; the battery manager 102 may be a BMS (Battery Management System ) board of the battery pack, in particular. The battery manager 102 obtains information such as the temperature of each battery pack through external communication; the battery manager 102 also enables communication with the controller 101 through internal communication.
In practical applications, the battery manager 102 may be configured to obtain voltage sampling values between two sides of the first main contactor K1 (and K1 ') in the slow start module 01 and another pole of the battery pack, and determine whether the first main contactor K1 (and K1') is adhered; the controller 101 is configured to control switching of the slow start circuit 10 in the slow start module 01, obtain a detection value of a bus voltage, and determine whether adhesion occurs in the second main contactor K2 in the slow start module 01.
Fig. 11 and fig. 12 are both shown by taking the case that the slow start circuit is disposed in the positive transmission branch, and in practical application, implementation forms of disposing the slow start circuit in the negative transmission branch are not excluded, and are not repeated here, and they are only required according to the specific application environment.
Taking the structure shown in fig. 11 as an example for illustration, the first main contactors K1 (and K1') are close to the voltage sampling value between one side of the battery pack and the other pole of the battery pack, that is, the sampling value of the battery port voltage; the first main contactor K1 (and K1') is close to a voltage sampling value between one side of the main circuit and the other pole of the battery pack, namely a sampling value of bus voltage; that is, the battery manager 102 needs to sample the battery port voltage and the bus voltage, respectively, and the controller 101 needs to sample the bus voltage. It should be noted that the two sampled cathodes are not at the same point, but are at the same potential only when the second main contactor K2 in the cathode transmission branch is closed. Therefore, there may be a certain difference between the bus voltage sampling of the controller 101 and the bus voltage sampling of the battery manager 102.
Based on the battery manager 102 sampling the battery port voltage and the bus voltage, it can be directly determined whether the first main contactor K1 is in the adhesion state. If the first main contactor K1 is adhered, the sampled values of the battery port voltage and the bus voltage obtained by the battery manager 102 are equal in size and equal to the battery voltage, and the battery manager 102 can directly output the adhesion failure of the contactor and transmit the adhesion failure to the controller 101, so that the machine is not started; if the first main contactor K1 is not adhered, the bus voltage of the battery manager 102 is 0, and normal adhesion determination can be performed until the power is turned on.
Fig. 12 is a further refinement of the transmission branch between the battery pack and the battery side of the main circuit based on the 0.25C (4 h energy storage system) energy storage converter shown in fig. 3, where the slow start module 01 removes the slow start contactor and the slow start resistor in the second transmission branch of the positive electrode. The slow start judgment logic is as follows: according to the sampled values of the battery port voltage and the bus voltage obtained by the battery manager 102, it can be directly determined whether the first main contactors K1 and K1' are in the adhesion state. If the sampled values of the at least one battery port voltage and the bus voltage obtained by the battery manager 102 are equal, indicating that the corresponding first main contactors are adhered; however, no matter which path of first main contactor fails, the battery manager 102 transmits the adhesion failure of the contactor to the controller 101, the controller 101 is not started, and the corresponding adhesion contactor is directly stopped, overhauled and replaced on site; if the magnitude of the sampled value of the bus voltage obtained by the battery manager 102 is 0, it indicates that neither of the first main contactors K1 and K1' is adhered, and at this time, normal adhesion judgment can be performed until the power-on operation.
The energy storage converter provided by the embodiment can play a role in current limiting when the busbar voltage is suddenly changed or the busbar is short-circuited through the slow start module 01; in addition, the bipolar main contactor can also avoid the condition that the breaking failure is caused by the adhesion failure of the single main contactor, so that the safety and the reliability of the energy storage converter are improved, the cost increase of the energy storage converter is avoided, and the effect of protecting the direct current loop is achieved. In addition, the battery manager 102 integrated inside the energy storage converter is used for sampling the voltages at two sides of the first main contactor, so that whether the first main contactor is adhered can be directly judged, and the risk that related devices are damaged by short-circuit impact current in the contactor adhesion judging method shown in fig. 6-10 can be avoided. In addition, aiming at the energy storage converter with multiple battery packs connected in parallel, the positive slow start circuit part can be removed by utilizing the judgment logic, so that the cost is greatly reduced.
For the energy storage converter provided in the previous embodiment, the contactor adhesion judgment method is applied to a control system in the energy storage converter, and the control system is used for controlling the slow start module 01 of the energy storage converter.
Similarly, the initial state of each contactor is an open state, and the initial state of the load switch is a closed state; referring to fig. 13, the method for determining adhesion of the contactor of the energy storage converter includes:
s601, judging whether the first main contactor is adhered or not according to voltage sampling values between two sides of the first main contactor in the slow start module and the other pole of the battery pack.
With the structure shown in fig. 11, step S601 is specifically that the battery manager 102 determines whether the first main contactor K1 is in the adhesion state according to the sampling of the battery port voltage and the sampling of the bus voltage; with the structure shown in fig. 12, step S601 is specifically that the battery manager 102 determines whether the first main contactors K1 and K1' are in the adhesion state according to the sampling of the voltages of the two battery ports and the sampling of the bus voltage.
For the structure shown in fig. 11, this step S601 may specifically include: judging whether two voltage sampling values at two sides of the first main contactor (K1) are identical or not; if the two voltage sampling values are the same, the first main contactor is judged to be adhered; if the two voltage sampling values are different, the first main contactor is judged to be not adhered. For the structure shown in fig. 12, this step S601 may specifically include: for the two first main contactors K1 and K1', respectively judging whether two voltage sampling values at two sides of the two first main contactors are identical; if the two voltage sampling values are the same, judging that the corresponding first main contactor is adhered; if the two voltage sampling values are different, it is determined that the corresponding first main contactor is not adhered.
S602, controlling a slow start circuit in the slow start module to cut in.
The process of this step S602 may be specifically referred to step S101 in the above embodiment, and will not be described herein.
S603, judging whether the second main contactor in the slow start module is adhered or not according to the detection value of the bus voltage in the energy storage converter.
The process of step S603 may be specifically referred to step S102 and its specific implementation form in the above embodiment, which are not described herein.
Also, after step S603, the contact adhesion judgment method may further include the steps shown in fig. 13:
s604, controlling the slow start circuit to cut out.
The process of step S604 may be specifically referred to step S201 in the above embodiment, and will not be described herein.
S605, judging whether the slow start contactor in the slow start circuit is adhered or not according to the detection value of the bus voltage.
The process of step S605 may be specifically referred to step S202 and its specific implementation form in the above embodiment, and will not be described herein.
In practical application, the method for judging adhesion of the contactor can further comprise: if all the contactors are not adhered, controlling the energy storage converter to start normally; and/or outputting a contactor adhesion fault alarm signal when any contactor is judged to be adhered.
In addition, after controlling the actions of each contactor, before judging whether the corresponding contactor is adhered according to the detection value of the bus voltage, the method further comprises the following steps: waiting for a preset time period.
The contactor adhesion judgment method of the energy storage converter can realize adhesion detection of the bipolar main contactor, is simple in logic and short in time, and is suitable for different scenes that the bus capacitor is a film capacitor and an electrolytic capacitor. Moreover, the risk of damaging the related devices by the short-circuit impact current existing in the contact adhesion judgment method shown in fig. 6 to 10 can be avoided.
The same and similar parts of the embodiments in this specification are all mutually referred to, and each embodiment focuses on the differences from the other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments 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 (28)
1. A slow start module of an energy storage converter, comprising: a first main contactor, a second main contactor and a soft start circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
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;
the second main contactor is disposed in another pole transfer leg between the battery pack and the energy storage converter battery side.
2. The slow start module of the energy storage converter of claim 1, wherein the slow start circuit comprises: a slow start contactor and a slow start resistor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the slow start contactor and the slow start resistor are connected in series.
3. The slow start module of an energy storage converter according to claim 1 or 2, wherein the first main contactor is arranged in a positive transmission branch between the battery pack and the battery side of the energy storage converter.
4. A slow start module for an energy storage converter according to claim 3, further comprising: at least one further said first main contactor;
each first main contactor is respectively arranged in an anode transmission branch corresponding to the space between the battery pack and the battery side of the energy storage converter; and only one first main contactor is connected with the slow start circuit in parallel in each first main contactor;
The cathodes of the battery packs are connected in parallel.
5. A method for judging adhesion of a contactor of an energy storage converter, which 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 4; the contactor adhesion judging method comprises the following steps:
controlling a slow start circuit in the slow start module to cut in;
judging whether the second main contactor in the slow start 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 circuit where the second main contactor is positioned 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.
6. The method for determining adhesion of contactors of an energy storage converter according to claim 5, wherein determining whether adhesion of a second main contactor in the slow start module occurs according to a detected value of a bus voltage in the energy storage converter comprises:
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 smaller than the first preset voltage, judging that the second main contactor is adhered.
7. The method for determining adhesion of contactors of an energy storage converter according to claim 6, wherein the case where the branch where the second main contactor is located is turned on is: judging the condition of adhesion of the second main contactor;
judging whether the first main contactor in the slow start module is adhered or not according to the detection value of the bus voltage, comprising:
judging whether the detection value is equal to the battery pack voltage;
if the detection value is equal to the battery pack voltage, judging that the first main contactor is adhered;
and if the detection value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
8. The method for determining adhesion of contactors of an energy storage converter according to claim 5, wherein determining whether adhesion occurs in a first main contactor of the slow start module according to the detected value of the bus voltage when the branch where the second main contactor is located is turned on, comprises:
controlling the second main contactor to be conducted;
judging whether the detection value is equal to the battery pack voltage;
If the detection value is equal to the battery pack voltage, judging that the first main contactor is adhered;
and if the detection value is not equal to the battery pack voltage, judging that the first main contactor is not adhered.
9. The method for determining adhesion of contactors of an energy storage converter as set forth in claim 5, further comprising, after determining whether adhesion occurs to a first main contactor in the slow start module according to the detected value of the bus voltage:
controlling the slow start circuit to cut out;
judging whether the slow start contactor in the slow start circuit is adhered or not according to the detection value of the bus voltage.
10. The method for determining adhesion of contactors of an energy storage converter according to claim 9, wherein determining whether adhesion of a slow start contactor in the slow start circuit occurs 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 detection value is greater than or equal to the second preset voltage, judging that the slow start contactor is adhered.
11. The method for determining adhesion of a contactor of an energy storage converter according to any one of claims 5 to 10, further comprising:
and if the contactors are not adhered, controlling the energy storage converter to start normally.
12. The method for determining adhesion of a contactor of an energy storage converter according to any one of claims 5 to 10, further comprising:
when any contactor is judged to be adhered, an adhesion fault alarm signal of the contactor is output.
13. The method according to any one of claims 5 to 10, wherein after controlling the operation of each contactor, before determining whether the corresponding contactor is stuck according to the detected value of the bus voltage, further comprising:
waiting for a preset time period.
14. The method for judging adhesion of the contactor of the energy storage converter is characterized by being applied to a control system of the energy storage converter, wherein the control system is used for controlling a slow start module of the energy storage converter according to any one of claims 1 to 4; the contactor adhesion judging method comprises the following steps:
judging whether the first main contactor is adhered or not according to voltage sampling values between two sides of the first main contactor in the slow start module and the other pole of the battery pack;
Controlling a slow start circuit in the slow start module to cut in;
and judging whether the second main contactor in the slow start module is adhered or not according to the detection value of the bus voltage in the energy storage converter.
15. The method for determining adhesion of contactors of an energy storage converter as set forth in claim 14, wherein determining whether adhesion of the first main contactor occurs according to voltage sampling values between two sides of the first main contactor in the slow start module and another pole of the battery pack, respectively, includes:
judging whether the two voltage sampling values at two sides of the first main contactor are the same or not;
if the two voltage sampling values are the same, the corresponding first main contactor is judged to be adhered;
if the two voltage sampling values are different, the fact that the corresponding first main contactor is not adhered is judged.
16. The method for determining adhesion of contactors of an energy storage converter according to claim 14, wherein determining whether adhesion of a second main contactor in the slow start module occurs according to a detected value of a bus voltage in the energy storage converter comprises:
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 smaller than the first preset voltage, judging that the second main contactor is adhered.
17. The method for determining adhesion of contactors of an energy storage converter according to claim 14, further comprising, after determining whether adhesion occurs to a second main contactor in the slow start module according to a detected value of a bus voltage in the energy storage converter:
controlling the slow start circuit to cut out;
judging whether the slow start contactor in the slow start circuit is adhered or not according to the detection value of the bus voltage.
18. The method for determining adhesion of contactors of an energy storage converter as set forth in claim 17, wherein determining whether adhesion of a slow start contactor in the slow start circuit occurs according to the detected value of the bus voltage includes:
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 detection value is greater than or equal to the second preset voltage, judging that the slow start contactor is adhered.
19. The method of any one of claims 14 to 18, further comprising: if all the contactors are not adhered, controlling the energy storage converter to start normally; and/or outputting a contactor adhesion fault alarm signal when any contactor is judged to be adhered;
And/or after controlling the action of each contactor, before judging whether the corresponding contactor is adhered according to the detection value of the bus voltage, the method further comprises the following steps: waiting for a preset time period.
20. An energy storage converter, comprising: a controller, a DC/AC conversion circuit, a bus capacitor and a slow start module of the energy storage converter according to any one of claims 1 to 4; wherein, the liquid crystal display device comprises a liquid crystal display device,
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 controlled by the controller;
the controller is configured to execute the contactor adhesion judgment method of the energy storage converter according to any one of claims 5 to 13.
21. The energy storage converter of claim 20, 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 anode and the cathode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
22. The energy storage converter of claim 21, further comprising: in addition, 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 sides of the DC/DC conversion circuits are respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start modules;
each DC/DC conversion circuit is controlled by the controller.
23. An energy storage converter, comprising: a control system, a DC/AC conversion circuit, a bus capacitor and a slow start module of the energy storage converter according to any one of claims 1 to 4; wherein, the liquid crystal display device comprises a liquid crystal display device,
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 controlled by the control system;
the control system is configured to perform the contactor adhesion determination method of the energy storage converter according to any one of claims 14 to 19.
24. The energy storage converter of claim 23, 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 anode and the cathode of the battery pack through the slow start module;
the DC/DC conversion circuit is controlled by the controller.
25. The energy storage converter of claim 24, further comprising: in addition, 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 sides of the DC/DC conversion circuits are respectively connected with the positive electrode and the negative electrode of the corresponding battery pack through the corresponding slow start modules;
each DC/DC conversion circuit is controlled by the controller.
26. An energy storage converter according to any of claims 23-25, wherein the control system comprises: the controller of the energy storage converter and the battery manager are in communication connection with the controller;
the battery manager is used for acquiring voltage sampling values between two sides of a first main contactor in the slow start module and the other pole of the battery pack respectively, and judging whether the first main contactor is adhered or not;
the controller is used for controlling switching of a slow start circuit in the slow start module, acquiring a detection value of bus voltage and judging whether the second main contactor in the slow start module is adhered or not.
27. An energy storage converter according to any of claims 23-25, further comprising: and the load switch is arranged in the positive and negative electrode transmission branch at the battery side of the energy storage converter.
28. The energy storage converter of claim 27, wherein when said slow start module comprises a plurality of first main contactors, one side of each of said first main contactors is connected to a corresponding battery pack, and the other side of each of said first main contactors is connected in parallel to a corresponding pole of said load switch.
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| 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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| CN116609665A (en) * | 2023-06-01 | 2023-08-18 | 沃尔特电子（苏州）有限公司 | Contactor adhesion detection method |
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| CN116609665A (en) * | 2023-06-01 | 2023-08-18 | 沃尔特电子（苏州）有限公司 | Contactor adhesion detection method |
| CN116609665B (en) * | 2023-06-01 | 2024-03-19 | 沃尔特电子（苏州）有限公司 | Contactor adhesion detection method |
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