CN114069789B - Control circuit of battery cluster parallel circulation transformer - Google Patents
Control circuit of battery cluster parallel circulation transformer Download PDFInfo
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- CN114069789B CN114069789B CN202111381070.2A CN202111381070A CN114069789B CN 114069789 B CN114069789 B CN 114069789B CN 202111381070 A CN202111381070 A CN 202111381070A CN 114069789 B CN114069789 B CN 114069789B
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- 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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a control circuit of a battery cluster parallel circulation transformer, which comprises a battery cluster, a fuse, a circuit breaker, a shunt, a relay, a unidirectional MOS tube switch I, a unidirectional MOS tube switch II, a current limiting resistor, a primary winding, a magnetic core and a secondary winding. The beneficial effects of the invention are as follows: the energy transfer between the battery clusters can be carried out no matter the system is in the charging, discharging and standing stages or in the non-running stage of the energy storage battery cluster system, the problem that the parallel circulation pre-charging circuit control scheme of the battery clusters can only control the parallel circulation of the battery clusters in a pre-charging circuit mode when the system stops working is solved, each transformer design unit used is identical, the random expansion of the number and the structure of the battery clusters of the battery cluster system is greatly facilitated, the differential balance between the battery clusters is realized in an energy transfer mode, and almost no energy loss exists in the working process.
Description
Technical Field
The invention relates to a control circuit, in particular to a control circuit of a battery cluster parallel loop transformer, and belongs to the technical field of control circuits.
Background
Along with the rapid development of world economy, the demand of all countries in the world for electric power is rapidly increased, the rapid expansion of the layout of the electric power industry is driven, the installed capacity of the power grid is greatly increased, and a series of electric energy problems are accompanied.
Because of the influence of natural environment and the production and living rules of human beings, the human beings have huge peak-valley difference on the power load demands, and the power load demands are large in a certain month or a certain hour in one year, so that huge operation pressure is brought to a power grid and a power plant; the power consumption at other times is relatively low, and the unit of the power system operates in a low-load state, so that the utilization rate and the operation economy of the power equipment are seriously affected.
The method for solving the problems is that an energy storage system is arranged in a power grid, electric energy generated by a generator set is stored in the energy storage system in a period of low electricity consumption, and the energy storage system supplies power to the power grid in a peak period of electricity consumption, so that electricity consumption requirements are met.
The energy storage system generally comprises a plurality of parallel energy storage branches, each energy storage branch is provided with a battery cluster, and the battery clusters are used for storing electric energy; however, due to the inconsistency of internal resistances, voltages, SOCs, and the like of the cells among the clusters, a voltage difference may exist between the parallel clusters, and when the multi-cluster battery clusters are operated in parallel, a circulation flow, i.e., energy flows from a high-voltage cluster to a low-voltage cluster, may be formed among the clusters. Once circulation is formed between the battery clusters, damage to the battery and other components and parts is caused, and even serious safety accidents are caused.
The current parallel loop control scheme of the battery clusters is realized by designing a pre-charging circuit on a main circuit of each battery cluster.
The battery cluster pre-charging circuit is designed in the BMS high-voltage box or the control cabinet, the BMS is electrified to detect the cluster end voltage of each cluster at first, when the cluster voltage difference is overlarge and exceeds the power possibly born by the pre-charging circuit, the BMS prompts that the cluster voltage difference is overlarge, and each cluster relay is kept in an off state.
When the voltage difference is within the possible bearing range of the pre-charging circuit, closing the total negative relay of each cluster, sequentially closing the pre-charging relay of each cluster, detecting that the current of each cluster is smaller than a certain value or the voltage difference is smaller than a certain range, sequentially closing the total positive relay of each cluster, delaying for a plurality of seconds, and then opening the pre-charging relay.
However, the battery cluster parallel loop precharge circuit control scheme has the following problems:
1) Before the energy storage battery cluster system is put into operation each time, the battery clusters are pre-charged by a pre-charging circuit, and when each battery cluster is pre-charged to a target voltage value, the battery clusters can be connected in parallel, so that the whole battery cluster system can be connected in parallel immediately and not at first;
2) In the running process of the energy storage battery cluster system, along with continuous charge and discharge, the inconsistency of each battery cluster can be gradually increased, when the inconsistency reaches a certain degree, the BMS can prompt and give an alarm, at the moment, the difference between the clusters is larger, the energy storage battery cluster system needs to stop working at the moment, and the energy storage battery cluster system needs to be matched with PCS and EMS to make the difference balance between the battery clusters. In the process of balancing the difference among the battery clusters, the whole energy storage battery cluster system cannot work normally at the same time.
Disclosure of Invention
The invention aims to provide a control circuit of a battery cluster parallel loop transformer for solving the problem.
The invention realizes the above purpose through the following technical scheme: a control circuit of a battery cluster parallel loop transformer comprises
The battery clusters are provided with a plurality of groups and are connected in parallel in the circulating current pre-charging circuit, and circuit breakers are connected in series on connecting lines of the battery clusters and the PCS+ side and the PCS-side of the circulating current pre-charging circuit;
a transformer which is provided between two adjacent battery clusters and which is composed of a primary winding connected in parallel with one of the battery clusters, a secondary winding connected in parallel with the other battery cluster, and a magnetic core provided between the primary winding and the secondary winding;
the current limiting resistors are arranged in a plurality of ways, are connected in parallel in pairs and are respectively connected in series on the connecting lines of the primary winding and the secondary winding, and a group of parallel-connected unidirectional MOS tube switches I and unidirectional MOS tube switches II are connected in series on the connecting lines of each current limiting resistor;
and the control circuit is used for commanding the working pace of all elements in the overall scheme.
As still further aspects of the invention: and a fuse is connected in series on the positive electrode connecting line of the battery cluster.
As still further aspects of the invention: and a shunt is connected in series on a negative electrode connecting line of the battery cluster.
As still further aspects of the invention: and the connecting lines of the primary winding and the secondary winding are respectively connected with a relay in series.
As still further aspects of the invention: the resistance values of a plurality of current limiting resistors connected in parallel in pairs and connected in series on the connecting lines of the primary winding and the secondary winding are respectively increased in sequence.
As still further aspects of the invention: the primary winding N 1 With secondary winding N 2 The coil turns ratio of (2) is 1:1.
A control circuit of a battery cluster parallel circulation transformer comprises the following steps of
(1) The combination and the on-off of the current limiting resistor R can be controlled respectively by controlling the combination and the on-off of the unidirectional MOS tube switch I S and the unidirectional MOS tube switch II Q;
(2) the total resistance of the access circuit can be changed by controlling the number of resistances of the access circuit in the current limiting resistor R, so that the current of the working circuit can be controlled.
The beneficial effects of the invention are as follows:
1. compared with the existing control scheme of the parallel circulation pre-charging circuit of the battery cluster, the circuit scheme of the invention can directly electrify the battery cluster without pre-charging in advance, thereby saving the time required by the pre-charging circuit;
2. compared with the existing control scheme of the parallel circulation pre-charging circuit of the battery clusters, the circuit can transfer energy among the battery clusters no matter in the charging, discharging and standing stages of the system or in the non-running stage of the energy storage battery cluster system, and the problem that the control scheme of the parallel circulation pre-charging circuit of the battery clusters can only control the parallel circulation of the battery clusters in a pre-charging circuit mode when the system stops working is solved;
3. the control scheme of the existing battery cluster parallel circulation pre-charging circuit can be carried out only by matching with PCS and EMS when the difference balance among the battery clusters is carried out, and the control of the battery cluster parallel circulation by the circuit scheme of the invention can be carried out only by matching with the BMS without matching with the PCS and the EMS;
4. in the circuit scheme of the invention, the magnitude of current can be controlled to switch Q of the unidirectional MOS tube through the control circuit when the electric quantity among the battery clusters is transferred 1 ～Q i 、S 1 ～S i Respectively controlling the current-limiting resistor R by combining and switching 1 ～R i Is adjustable by combination and on-off of the components;
5. according to the circuit scheme, each transformer design unit used in the process of transferring electric energy among the battery clusters is identical, so that the number and the structure of the battery clusters of the battery cluster system can be greatly expanded at will;
6. the differential balance between the circuit scheme and the battery clusters is realized by an energy transfer mode, and almost no energy is lost in the working process.
Drawings
FIG. 1 is a circuit diagram of a control circuit of a battery cluster parallel loop transformer;
fig. 2 is a battery cluster B j-1 Is transferred to the primary winding N 1 A current pattern in (a);
FIG. 3 shows a primary winding N 1 Is transferred to and stored in battery cluster B j A current pattern in (a);
FIG. 4 shows a partial charge transfer storage of parallel battery clusters to primary winding N 1 A current pattern in (a);
FIG. 5 shows a primary winding N 1 Is transferred to and stored in battery cluster B j+1 A current pattern in (a);
in the figure: B. battery cluster, U, fuse, D, breaker, F, shunt, K, relay, S, unidirectional MOS tube switch I, Q, unidirectional MOS tube switch II, R, current-limiting resistor, N 1 Primary winding, T, magnetic core, N 2， Secondary winding.
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.
Example 1
Referring to FIG. 1, a control circuit for a parallel loop transformer of a battery cluster includes
The battery clusters B are provided with a plurality of groups and are connected in parallel in the circulating pre-charging circuit, and circuit breakers D are connected in series on connecting lines of the battery clusters B and the PCS+ side and the PCS-side of the circulating pre-charging circuit;
a transformer which is disposed between adjacent two of the battery clusters B and which is composed of a primary winding N connected in parallel with one of the battery clusters B 1 A secondary winding N connected in parallel with another of said battery clusters B 2 Is arranged on the primary winding N 1 With secondary winding N 2 A magnetic core T between the two;
the current limiting resistors R are arranged in a plurality of pairs and are connected in parallel and in series with the primary winding N 1 With secondary winding N 2 A group of parallel-connected one-way MOS tube switches I and two one-way MOS tube switches Q are connected in series on the connecting line of each current limiting resistor R;
and the control circuit is used for commanding the working pace of all elements in the overall scheme.
In the embodiment of the invention, the fuse U is connected in series on the positive electrode connecting line of the battery cluster B, so that the battery cluster B can be protected by short circuit.
In the embodiment of the invention, the shunt F is connected in series with the negative electrode connecting circuit of the battery cluster B, and the shunt F can play a role in measuring and monitoring the working current of the battery cluster B and send the current information to the control circuit.
In an embodiment of the invention, the primary winding N 1 With secondary winding N 2 The connecting lines of the two switches are all connected with a relay K in series.
In the embodiment of the invention, the primary is connected in seriesWinding N 1 With secondary winding N 2 The resistance values of the current limiting resistors R connected in parallel in pairs on the connecting line are respectively increased in sequence.
In an embodiment of the invention, the primary winding N 1 With secondary winding N 2 The turns ratio of the coil is 1:1, so that the input voltage value and the output voltage value of the transformer are equal.
A control circuit of a battery cluster parallel circulation transformer comprises the following steps of
(1) The combination and the on-off of the current limiting resistor R can be controlled respectively by controlling the combination and the on-off of the unidirectional MOS tube switch I S and the unidirectional MOS tube switch II Q;
(2) the total resistance of the access circuit can be changed by controlling the number of resistances of the access circuit in the current limiting resistor R, so that the current of the working circuit can be controlled.
Example two
Referring to fig. 2 to 5, a control circuit for a parallel loop transformer of a battery cluster, which specifically implements the following steps with respect to the working process of the control circuit for a parallel loop transformer of a whole battery cluster:
in the first case, assume a battery cluster B j-1 The voltage value is higher than that of the battery cluster B j If the PCS +/-side breaker is directly closed at this time, a loop current is generated, so that the breaker cannot be directly closed, and the battery cluster B needs to be firstly closed j-1 Voltage value and battery cluster B j The circuit breaker can be closed after the voltage values of the voltage values are consistent.
The first step, through the control circuit to the overall calculation analysis of the voltage difference value of the 2 clusters of battery clusters, the number and combination of the current limiting resistors needing to be connected into the circuit can be given, and the current limiting resistor R is only needed to be connected into this time 1 。
The relay K is enabled by a control circuit 1 Conduction and unidirectional MOS tube switch Q 1 Conduction, battery cluster B j-1 And current limiting resistor R 1 And a primary winding N of a transformer 1 Forming a current path, primary winding N of transformer 1 And starts to be in the working mode. Along with the battery cluster B j-1 For primary winding N 1 Charging processPrimary winding N 1 Gradually increasing to peak current, at which time relay K is closed 1 And unidirectional MOS tube switch Q 1 . Thus battery cluster B j-1 Part of the energy of the transformer is transferred to the primary winding N 1 Is a kind of medium.
Battery cluster B j-1 Is transferred to the primary winding N of the transformer 1 The current direction in (a) is shown in figure 2.
A second step, after the electric energy transfer in the first step, the primary winding N of the transformer 1 Voltage value at two ends and battery cluster B j-1 Is of a voltage value equivalent to that of the adjacent battery cluster B j Is provided with a primary winding N 1 The internal stored electric energy is transferred to the battery cluster B j Is a condition of (2).
Assuming an overall computational analysis by the control circuit, the primary winding N of the transformer 1 To battery cluster B j During the transfer of the electric energy, a larger current can be used, so the current-limiting resistor R is assumed to be 1 And R is i Can be turned on at the same time.
The relay K is enabled by a control circuit 2 On-one-way MOS tube switch S 1 、S i Conduction, battery cluster B j And current limiting resistor R 1 And R is R i Is combined in parallel with the secondary winding N of the transformer 2 Forming a current path such that the primary winding N of the transformer 1 The electric energy stored after the first step is coupled to the secondary winding N of the transformer 2 In the secondary winding N of the transformer 2 And starts to be in the working mode. With the secondary winding N of the transformer 2 To battery cluster B j Charging proceeds, secondary winding N 2 Is gradually discharged, the current gradually decreases from the peak current to zero, at which time the relay K is closed 2 And a unidirectional MOS tube switch S 1 、S i . The primary winding N of such a transformer 1 The electric energy of (a) is transferred and stored in the battery cluster B j Is a kind of medium.
Primary winding N of transformer 1 Is transferred to and stored in battery cluster B j The direction of the current in (a) is shown in figure 3.
Third, through the above first and second steps, the battery cluster B can be obtained j-1 Specific battery cluster B j Much of the electrical energy is transferred half to battery cluster B j Thereby finally making the battery cluster B j-1 And battery cluster B j The stored electric energy is consistent, and the voltages are substantially equal.
In the second case, if a battery cluster B is assumed j-1 The voltage value is lower than that of the battery cluster B j If the PCS +/-side breaker is directly closed at this time, a loop current is generated, so that the breaker cannot be directly closed, and the battery cluster B needs to be firstly closed j-1 Voltage value and battery cluster B j The circuit breaker can be closed after the voltage values of the voltage values are consistent.
At this time, battery cluster B j The stored electric energy is higher than that of the battery cluster B j-1 The stored electric energy is used for making the voltages of the 2 clusters of cells substantially equal, and the cell cluster B j Specific battery cluster B j-1 Much of the electrical energy is transferred half to battery cluster B j-1 The steps and manner of the transfer of electrical energy are similar to those used in the first case above.
The first case and the second case are aimed at electric energy transfer between two adjacent battery clusters, and finally the voltages of the two adjacent battery clusters are equal, so that the generation of circulation when the two battery clusters are connected in parallel is avoided.
Third case, assume a battery cluster B j-1 Voltage value and battery cluster B j The two battery clusters can be directly connected in parallel, but the voltage value of the two battery clusters after being connected in parallel is higher than that of the battery cluster B j+1 The three clusters of cells cannot be connected in parallel directly because the voltage values of the three clusters of cells are high, and the voltage values of the three clusters of cells need to be adjusted to the same level first, namely, the cell cluster B is needed to be connected in parallel j-1 And battery cluster B j One third of the total electric quantity after parallel connection is transferred to the battery cluster B j+1 Is a kind of medium.
First, the battery cluster B is made by the control circuit j-1 And battery cluster B j The PCS +/-side breaker between is closed and conductive, allowing for these 2 direct parallel battery clusters. Then the battery cluster is made by the control circuitB j And battery cluster B j+1 Relay K between 1 Conduction and unidirectional MOS tube switch Q 1 Conduction, battery cluster B j-1 And battery cluster B j Parallel battery cluster and current limiting resistor R formed after direct parallel connection 1 And a primary winding N of a transformer 1 Forming a current path, primary winding N of transformer 1 And starts to be in the working mode. Primary winding N with parallel battery clusters 1 Charging proceeds with primary winding N 1 Gradually increasing to peak current, at this time, closing the PCS +/-side breaker and unidirectional MOS transistor switch Q 1 . So that part of the electric energy of the parallel battery cluster is transferred and stored to the primary winding N of the transformer 1 Is a kind of medium.
Partial energy transfer of parallel battery clusters to primary winding N of transformer 1 The current direction in (a) is shown in fig. 4.
A second step, after the electric energy transfer in the first step, the primary winding N of the transformer 1 The voltage values of the two ends are equivalent to the voltage values of the parallel battery clusters and higher than those of the adjacent battery clusters B j+1 Is provided with a primary winding N 1 The internal stored electric energy is transferred to the battery cluster B j+1 Is a condition of (2).
Assuming an overall computational analysis by the control circuit, the primary winding N of the transformer 1 To battery cluster B j It is assumed that the current limiting resistor R is now i Opening.
The relay K is enabled by a control circuit 2 On-one-way MOS tube switch S i Conduction, battery cluster B j+1 And current limiting resistor R i Secondary winding N of transformer 2 Forming a current path such that the primary winding N of the transformer 1 The electric energy stored after the first step is coupled to the secondary winding N of the transformer 2 In the secondary winding N of the transformer 2 And starts to be in the working mode. With the secondary winding N of the transformer 2 To battery cluster B j+1 Charging proceeds, secondary winding N 2 Is gradually discharged, the current gradually decreases from the peak current to zero, at which time the relay K is closed 2 And one-way MOS tubeSwitch S i . The primary winding N of such a transformer 1 The electric energy of (a) is transferred and stored in the battery cluster B j+1 Is a kind of medium.
Primary winding N 1 Is transferred to and stored in battery cluster B j+1 The current direction in (a) is shown in fig. 5.
Third, through the above first and second steps of several times of electric energy transfer, the parallel battery cluster can be compared with battery cluster B j+1 One third of the more electric energy is transferred to the battery cluster B j+1 Thereby finally making the battery cluster B j+1 And the voltage of the parallel battery cluster is basically equal.
Fourth, if it is assumed that battery cluster B j-1 And battery cluster B j The voltage value of the parallel battery cluster formed after direct parallel connection is lower than that of the battery cluster B j+1 If the circuit breaker on the +/-side of the PCS is directly closed at this time, a circulation current is generated, so that the circuit breaker cannot be directly closed, and the circuit breaker can be closed only after the voltage values of the 3 clusters of battery clusters are consistent.
At this time, battery cluster B j+1 The stored energy is higher than that of the parallel battery clusters, and the battery cluster B is needed to be used for equalizing the voltages of the 3 battery clusters j+1 Two-thirds more power is transferred into the parallel battery clusters than into the parallel battery clusters, and the steps and manners of power transfer are similar to those adopted in the third case above.
Working principle: and surplus electric energy of the battery clusters with high voltage is transferred and distributed into the battery clusters with low voltage through the transfer function of the transformer, so that the voltage consistency of each battery cluster is achieved, and the generation of circulation among the battery clusters is avoided. The electric energy transfer between the battery clusters can be carried out in the charging, discharging and standing stages in the working state of the battery clusters, and can also be carried out in the non-working state of the battery cluster system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A battery cluster parallel circulation transformer control circuit is characterized in that: comprising
The battery clusters (B) are provided with a plurality of groups and are connected in parallel in the circulating current pre-charging circuit, and circuit breakers (D) are connected in series on connecting lines of the battery clusters (B) and the PCS+ side and the PCS-side of the circulating current pre-charging circuit;
a transformer which is arranged between two adjacent battery clusters (B) and which is formed by a primary winding (N) connected in parallel with one of the battery clusters (B) 1 ) A secondary winding (N) connected in parallel with another of said battery clusters (B) 2 ) Is arranged in the primary winding (N 1 ) With secondary winding (N) 2 ) A magnetic core (T) therebetween;
the current limiting resistors (R) are arranged in a plurality of pairs and are connected in parallel and in series with the primary winding (N 1 ) With secondary winding (N) 2 ) A group of parallel-connected unidirectional MOS tube switches I (S) and unidirectional MOS tube switches II (Q) are connected in series on the connecting line of each current limiting resistor (R);
and the control circuit is used for commanding the working pace of all elements in the overall scheme.
2. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: and a fuse (U) is connected in series on the positive electrode connecting line of the battery cluster (B).
3. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: and a shunt (F) is connected in series on the negative electrode connecting line of the battery cluster (B).
4. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: the primary winding (N 1 ) With secondary winding (N) 2 ) The connecting lines of the two switches are all connected with a relay (K) in series.
5. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: is connected in series with the primary winding (N 1 ) With secondary winding (N) 2 ) The resistance values of the current limiting resistors (R) connected in parallel in pairs on the connecting line are respectively increased in sequence.
6. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: the primary winding (N 1 ) With secondary winding (N) 2 ) The coil turns ratio of (2) is 1:1.
7. A battery cluster parallel loop transformer control circuit as set forth in claim 1, wherein: the control method of the control circuit comprises the following steps of
(1) The combination and the on-off of the current limiting resistor (R) can be controlled respectively by controlling the combination and the on-off of the unidirectional MOS tube switch I (S) and the unidirectional MOS tube switch II (Q);
(2) by controlling the number of resistors of the access circuit in the current limiting resistor (R), the total resistance of the access circuit can be changed, so that the current of the working circuit can be controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111381070.2A CN114069789B (en) | 2021-11-20 | 2021-11-20 | Control circuit of battery cluster parallel circulation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111381070.2A CN114069789B (en) | 2021-11-20 | 2021-11-20 | Control circuit of battery cluster parallel circulation transformer |
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