CN212965337U - Multi-port energy semi-closed type substation storage battery charging and discharging testing device - Google Patents
Multi-port energy semi-closed type substation storage battery charging and discharging testing device Download PDFInfo
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- CN212965337U CN212965337U CN202020999471.9U CN202020999471U CN212965337U CN 212965337 U CN212965337 U CN 212965337U CN 202020999471 U CN202020999471 U CN 202020999471U CN 212965337 U CN212965337 U CN 212965337U
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Abstract
The utility model discloses embodiment provides a multiport energy semi-enclosed transformer substation battery charge-discharge testing arrangement belongs to the direct current power supply equipment's of transformer substation test technical field. The device comprises: a direct current bus; at least two DC/DC modules, wherein each group of the battery packs is connected with a direct current bus through at least one DC/DC module; the AC/DC module is used for connecting an alternating current end to an alternating current, and a direct current end is connected with the direct current bus; and the control unit is connected with the DC/DC module and the AC/DC module and is used for controlling the work of the DC/DC module and the AC/DC module. The device and the method can simultaneously realize the charge and discharge tests of a plurality of storage batteries.
Description
Technical Field
The utility model relates to a direct current power supply equipment's of transformer substation test technical field specifically relates to a multiport energy semi-enclosed transformer substation battery charge-discharge testing arrangement.
Background
The storage battery pack is an indispensable device in a direct-current power supply system of a transformer substation, and when the alternating-current power supply system of the transformer substation breaks down, the storage battery pack is required to be used for providing continuous power supply for loads such as relay protection, automatic devices, communication and illumination, so that equipment can continue to operate normally, and the transformer substation can be guaranteed to be safe for passing the fault period. The electric quantity which can be actually discharged by the storage battery pack directly determines the continuous power supply capacity of the direct-current power supply system, so that a certain number of single storage batteries are required to be extracted for carrying out capacity test before a new storage battery pack of a transformer substation is put into operation; for the storage battery in operation, when the storage battery is periodically subjected to capacity discharge, a charge-discharge activation test is carried out on the laggard single storage battery. The traditional checking test or activation test of the capacity of the storage battery mostly adopts energy-consuming equipment, the test time is long one by one, and the electric energy waste is caused by multiple times of circulating tests.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multiport energy semi-enclosed transformer substation battery charge-discharge testing arrangement. The device can realize the charge and discharge test of a plurality of storage batteries simultaneously.
In order to achieve the above object, the utility model provides an embodiment of the utility model provides a multiport energy semi-enclosed transformer substation battery charge-discharge testing arrangement, the device includes:
a direct current bus;
at least two DC/DC modules, wherein each group of the battery packs is connected with a direct current bus through at least one DC/DC module;
the AC/DC module is used for connecting an alternating current end to an alternating current, and a direct current end is connected with the direct current bus; and
and the control unit is connected with the DC/DC module and the AC/DC module and is used for controlling the work of the DC/DC module and the AC/DC module.
Optionally, the control unit comprises:
an AC/DC controller for controlling the AC/DC module;
the DC/DC controllers correspond to the DC/DC modules one by one and are used for controlling the corresponding DC/DC modules; and
and the system control module is used for sending control instructions to the DC/DC controller and the AC/DC controller.
Optionally, the DC/DC module comprises:
a first controllable switch, a first end of which is connected with the DC/DC controller, and a second end of which is used for being connected to a positive phase line of the direct current bus;
a first end of the second controllable switch is connected with the DC/DC controller, and a second end of the second controllable switch is connected with a third end of the first controllable switch;
one end of the first inductor is connected with the third end of the first controllable switch, and the other end of the first inductor is used for being connected to the positive phase line; and
and one end of the first capacitor is connected with the third end of the second controllable switch, and the other end of the first capacitor is connected with the other end of the first inductor.
Optionally, the DC/DC controller comprises:
the first driving circuit is used for being connected with the first ends of the first controllable switch and the second controllable switch;
the first sampling conditioning circuit is used for collecting the current of a node between the other end of the first inductor and the negative phase line, the current of a node between the other end of the first inductor and the other end of the first capacitor, the voltage of the direct-current bus and the voltage of the battery pack;
one end of the first PWM modulation module is connected with the first driving circuit; and
and the first end of the first DSP controller is connected with the first PWM modulation module, the second end of the first DSP controller is connected with the first sampling conditioning circuit, the third end of the first DSP controller is connected with the system control module, and the fourth end of the first DSP controller is used for being connected with an external monitoring panel.
Optionally, the AC/DC module comprises:
the second capacitor is used for connecting one end of the second capacitor to a positive phase line of the direct current bus and connecting the other end of the second capacitor to a negative phase line of the direct current bus;
a third controllable switch, a first terminal of which is connected with the AC/DC controller, and a second terminal of which is connected with one terminal of the second capacitor;
a fourth controllable switch having a first terminal connected to the AC/DC controller and a second terminal connected to a second terminal of the third controllable switch;
a first end of the third controllable switch is connected with the first end of the first capacitor, a second end of the third controllable switch is connected with a third end of the third capacitor, and the third end of the third controllable switch is connected with the other end of the second capacitor;
a first end of the sixth controllable switch is connected with the AC/DC controller, a second end of the sixth controllable switch is connected with a third end of the fourth controllable switch, and the third end of the sixth controllable switch is connected with the other end of the second capacitor;
one end of the second inductor is connected with the third end of the fourth controllable switch; and
and a first end of the mutual inductor is connected with the other end of the second inductor, a second end of the mutual inductor is connected with a third end of the third controllable switch, and the third end and the fourth end of the mutual inductor are used for being connected to the alternating current.
Optionally, the AC/DC controller comprises:
a second driving circuit, configured to be connected to first ends of the third controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch;
the second sampling conditioning circuit is used for collecting the current of the positive phase line, the voltage between the positive phase line and the negative phase line, the voltage of a node between one end of the second inductor and the second end of the transformer and the current of the second end of the transformer;
one end of the second PWM modulation module is connected with the second driving circuit;
and the first end of the second DSP controller is connected with the first PWM modulation module, the second end of the second DSP controller is connected with the second sampling conditioning circuit, the third end of the second DSP controller is connected with the system control module, and the fourth end of the second DSP controller is used for being connected with an external monitoring panel.
Through the technical scheme, the utility model provides a multiport energy semi-enclosed transformer substation storage battery charge-discharge testing arrangement in storage battery test process, charge, discharge the group battery can realize that the electricity of energy between two types of battery packs is sealed. If the discharged electric quantity or power of the discharge battery pack cannot meet the requirement of the charge battery pack, the shortage part can supplement the electric quantity or power of the charge battery pack through alternating current rectification on the side of a power grid; if the electric energy of the discharging storage battery is not discharged completely, the charging battery pack is fully charged, or the output power of the discharging storage battery is larger than the charging power of the charging storage battery, and the redundant electric energy or power is fed back to the power grid through the power grid side. Compared with the prior art, the electric energy can be efficiently utilized, and the testing speed of the storage battery is improved.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a block diagram of a multi-port energy semi-enclosed substation battery charge and discharge testing apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of the multi-port energy semi-enclosed substation battery charging and discharging test device according to an embodiment of the present invention
Fig. 3 is a partial block diagram of a multi-port energy semi-enclosed substation battery charge and discharge test apparatus according to an embodiment of the present invention;
fig. 4 is a partial block diagram of a multi-port energy semi-enclosed substation battery charge and discharge test apparatus according to an embodiment of the present invention;
fig. 5 is a flow chart of a multi-port energy semi-enclosed substation battery charge-discharge testing method according to an embodiment of the present invention; and
fig. 6 is a flow chart of a multi-port energy semi-enclosed substation battery charge-discharge testing method according to an embodiment of the present invention.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is merely for purposes of illustration and explanation and is not intended to limit the embodiments of the present invention.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship between the components in the vertical, or gravitational direction.
In addition, if there is a description in the embodiments of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments can be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a block diagram illustrating a multi-port energy semi-enclosed substation battery charging and discharging test apparatus according to an embodiment of the present invention. In fig. 1, the apparatus may include a control unit 01, a direct current bus 02, a DC/DC module 10, and an AC/DC module 20. The number of the DC/DC modules 10 may be at least two, and the DC/DC modules correspond to at least two groups of battery packs to be tested one to one. Each group of battery packs is connected to the DC bus 02 via at least one DC/DC module 10. The AC side of the AC/DC module 20 may be used for connection to an alternating current (mains) and the DC side of the AC/DC module 20 may be connected to a DC bus 02. The control unit 01 may be connected to the DC/DC module 10 and the AC/DC module 20, respectively, for controlling the operations of the DC/DC module 10 and the AC/DC module 20. In this embodiment, the charging voltage of the battery is generally low, and is generally 2V, 6V, 12V, or the like. In order to reduce the voltage of the utility power to the same level, an AC-side power frequency transformer may be additionally provided on the AC side of the AC/DC module 20 to reduce the voltage.
In one embodiment of the present invention, the structure of the control unit 01 may be in various forms known to those skilled in the art, such as a general purpose processor, a special purpose processor, a conventional processor, a Digital Signal Processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) circuit, any other type of Integrated Circuit (IC), a state machine, a System On Chip (SOC), and the like. In a preferred example of the present invention, as shown in fig. 2, the control unit 01 may include a system control module 011, a DC/DC controller 012, and an AC/DC controller 013. The system control module 011 can be connected to the DC/DC controller 012 and the AC/DC controller 013, and configured to send control commands to the DC/DC controller 012 and the AC/DC controller 013. The DC/DC controllers 012 may correspond to the DC/DC modules 10 one to one, and each DC/DC controller 012 may be configured to control the corresponding DC/DC module 10. An AC/DC controller 013 can be connected to the AC/DC module 20 for controlling the AC/DC module 20.
In one embodiment of the present invention, the structure of the DC/DC module 10 may be various types known to those skilled in the art, such as a Bidirectional DC/DC (BDC) main circuit, a Dual active bridge converter (DAB) and other circuit structures with consistent functions. In a preferred embodiment of the present invention, as shown in fig. 3, the DC/DC module 10 may include a first controllable switch M1, a second controllable switch M2, a first inductor L1, and a first capacitor C1. A first terminal of the first controllable switch M1 may be connected to the DC/DC controller 012, and a second terminal may be used to connect to the positive phase line 02+ of the DC bus 02. The second controllable switch M2 may be connected with the DC/DC controller 012 at a first terminal and with the first controllable switch M1 at a second terminal. One end of the first inductor L1 may be connected to the third terminal of the first controllable switch M1, and the other end may be used to connect to the positive phase line 02 +. One end of the first capacitor C1 may be connected to the third terminal of the second controllable switch M2, and the other end may be connected to the other end of the first inductor L1. In this embodiment, the specific structure of the first controllable switch M1 and the second controllable switch M2 may be various types of controllable switches known to those skilled in the art, such as MOS transistors, IGBTs (Insulated Gate Bipolar transistors), IGCTs, and the like. In a preferred example of the present invention, the first controllable switch M1 and the second controllable switch M2 may be IGBTs. Accordingly, the first terminal may be a gate of the IGBT, the second terminal may be a collector of the IGBT, and the third terminal may be an emitter of the IGBT.
In one embodiment of the present invention, the structure of the DC/DC controller 012 may be various forms as known to those skilled in the art, for example. In an embodiment of the present invention, as shown in fig. 3, the DC/DC controller 012 may include a first driving circuit 11, a first sampling and conditioning circuit 12, a first PWM modulation module 13, and a first DSP controller 14. The first driving circuit 11 can be used to connect with the first ends of the first controllable switch M1 and the second controllable switch M2 to control the on/off of the first controllable switch M1 and the second controllable switch M2. In particular, the first drive circuit 12 may be used to amplify the switch-off signal, thereby triggering a pulse to control the first and second controllable switches M1 and M2. The first sample conditioning circuit 12 may be used to collect the current I (also through the DC/DC module 10) at the node between the other end of the first inductor L1 and the negative phase line 02 —BCurrent I (also through the battery pack) at the node between the other end of the first inductor L1 and the other end of the first capacitor C1bVoltage U of dc bus 02BAnd voltage U of the battery packb. One end of the first PWM modulation module 13 may be connected to the first driving circuit 11 for generating a switch-off signal for controlling the first DC/DC module 10, thereby adjusting the charging or discharging power of the battery pack by adjusting the duty ratio of the PWM signal for controlling the controllable switch. A first terminal of the first DSP controller 14 may be connected to the first PWM modulation module 13, and a second terminal may be connected to the first sampleThe conditioning circuit 12 is connected, the third terminal can be connected with the system control module 011, and the fourth terminal can be used for connecting with an external monitoring panel 014. Specifically, the third terminal may be connected to the monitoring panel 014, for example, via serial communication, and the fourth terminal may be connected to the system control module 011, for example, via ethernet communication. In addition, in this embodiment, the specific structure of the first sampling conditioning circuit 12 may be various types known to those skilled in the art. In this embodiment, since the first sampling and conditioning circuit 12 needs to collect a plurality of voltage and current data, the first sampling and conditioning circuit 12 may include one or more voltage sensors or current sensors, and the connection form of the voltage sensors or current sensors should be known to those skilled in the art, for example, a sampling circuit formed by the voltage sensors or current sensors is first provided, and then a conditioning circuit for conditioning the sampling signal is provided, so as to form the first sampling and conditioning circuit. Further, since the temperature of the battery under the charging and discharging conditions is often required to be collected during the testing process of the battery, the first sampling conditioning circuit 12 may further include, for example, a temperature collecting module based on the requirement.
In one embodiment of the present invention, the AC/DC module 20 may be configured in various ways known to those skilled in the art, such as a single-phase bridge circuit, and the AC/DC module 20 is in an inverted state when the bus 02 feeds back energy to the AC power AC and in a rectified state when the AC power AC inputs energy to the bus 02. In this embodiment, as shown in fig. 4, the AC/DC module may include a second capacitor C2, a third controllable switch M3, a fourth controllable switch M4, a fifth controllable switch M5, a sixth controllable switch M6, a second inductor L2, and a transformer L. Wherein one end of the second capacitor C2 may be used to connect to the positive line 02+ of the dc bus 02 and the other end may be used to connect to the negative line 02-of the dc bus 02. A first terminal of the third controllable switch M3 may be connected to the AC/DC controller 013 and a second terminal may be connected to one terminal of the second capacitor C2. A first terminal of the fourth controllable switch M4 may be connected to the AC/DC controller 20 and a second terminal may be connected to a second terminal of the third controllable switch M3. A first terminal of the fifth controllable switch M5 may be connected to the AC/DC controller 013, a second terminal may be connected to a third terminal of the third controllable switch M3, and the third terminal may be connected to the other terminal of the second capacitor C2. A first terminal of the sixth controllable switch M6 may be connected to the AC/DC controller 013, a second terminal may be connected to a third terminal of the fourth controllable switch M4, and the third terminal may be connected to the other terminal of the second capacitor C2. One end of the second inductor L2 may be connected to the third end of the fourth controllable switch M4. A first terminal of the transformer L may be connected to the other terminal of the second inductor L2, a second terminal may be connected to a third terminal of the third controllable switch M3, and the third and fourth terminals may be for connection to alternating current AC. In this embodiment, the specific configurations of the third controllable switch M3, the fourth controllable switch M4, the fifth controllable switch M5 and the sixth controllable switch M6 may be various types of controllable switches known to those skilled in the art, such as MOS transistors, IGBTs (Insulated Gate Bipolar transistors), IGCTs, and the like. In a preferred example of the present invention, the third controllable switch M3, the fourth controllable switch M4, the fifth controllable switch M5 and the sixth controllable switch M6 may be IGBTs. Accordingly, the first terminal may be a gate of the IGBT, the second terminal may be a collector of the IGBT, and the third terminal may be an emitter of the IGBT.
In one embodiment of the present invention, the structure of the AC/DC controller may be in various forms known to those skilled in the art. In this embodiment, as shown in fig. 4, the AC/DC controller may include a second driving circuit 21, a second sampling conditioning circuit 22, a second PWM modulation module 23, and a second DSP controller 24. The second driving circuit 21 may be connected to the first ends of the third controllable switch M3, the fourth controllable switch M4, the fifth controllable switch M5 and the sixth controllable switch M6 for controlling the operation of at least one of them. In particular, the second driving circuit 21 may be configured to amplify the turn-off signal so as to trigger a pulse to control the turn-off of the third controllable switch M3, the fourth controllable switch M4, the fifth controllable switch M5 and the sixth controllable switch M6. The second sampling and conditioning circuit 22 can be used for collecting the current I of the positive phase line 02+BNormal phase line 0Voltage U between 2+ and negative phase line 02-BThe voltage U of a node between one end of the second inductor L2 and the second end of the transformer LaAnd the current I of the second terminal of the transformer La. One end of the second PWM modulation module 23 may be connected to the second driving circuit 21, and may be used to generate an on/off signal for controlling the AC/DC module 10, so as to adjust the charging or discharging power of the battery pack by adjusting the duty ratio of the PWM signal for controlling the controllable switch. A first terminal of the second DSP controller 21 may be connected to the first PWM modulation module 23, a second terminal may be connected to the second sampling and conditioning circuit 22, a third terminal may be connected to the system control module 011, and a fourth terminal may be used to connect to the external monitoring panel 014. Specifically, the third terminal may be connected to the monitoring panel 014, for example, via serial communication, and the fourth terminal may be connected to the system control module 011, for example, via ethernet communication. In addition, in this embodiment, the specific structure of the second sampling conditioning circuit 22 may be various types known to those skilled in the art. In this embodiment, since the second sampling and conditioning circuit 22 needs to collect a plurality of voltage and current data, the second sampling and conditioning circuit 22 may include one or more voltage sensors or current sensors, and the specific connection form of the voltage sensors or current sensors should be known to those skilled in the art, for example, a sampling circuit formed by the voltage sensors or current sensors is first provided, and then a conditioning circuit for conditioning the sampling signals is provided, so as to form the first sampling and conditioning circuit. Further, since the temperature of the battery under the charging and discharging conditions is often required to be collected during the testing process of the battery, the second sampling and conditioning circuit 22 may further include, for example, a temperature collecting module based on the requirement.
In this embodiment, a specific control method for the apparatus as described in any of fig. 1 to 4 may include one or more conventional steps specified by those skilled in the art in conjunction with different battery types. In a preferred example of the present invention, the method may include at least a portion of the steps as shown in fig. 5. In fig. 5, the method may include:
in step S10, a test is performed using any of the devices described above;
in step S11, the connection between the dc bus and the ac power is disconnected. Specifically, taking the device shown in fig. 1 as an example, the step S11 may be that the control unit 01 sends a control instruction to the AC/DC module 20 to disconnect the connection between the alternating current AC and the direct current bus 02.
In step S12, the control device causes one of the first battery pack and the second battery pack to perform a discharging operation. Specifically, taking the device shown in fig. 1 as an example, in the case of causing the first battery pack B1 to perform a discharging operation, it may be that the control unit 01 issues a command to the DC/DC module 10 corresponding to the first battery pack B1 to connect the first battery pack B1 with the DC bus 02. For the case where the second battery pack B2 is caused to perform the discharging operation, similar to the case of the first battery pack B1, the description thereof will be omitted.
In step S13, the device is controlled so that the other of the first battery pack and the second battery pack performs a charging operation. Specifically, taking the device shown in fig. 1 as an example, in the case of causing the first battery pack B1 to perform a discharging operation, the control unit 01 issues a command to the DC/DC module 10 corresponding to the first battery pack B1 to connect the first battery pack B1 with the DC bus 02; at this time, the first battery pack B1 discharges to the DC bus 02, and the control unit 01 further instructs the DC/DC module 10 corresponding to the second battery pack B2 to connect the second battery pack B2 with the DC bus 02, so that the first battery pack B1 charges the second battery pack B2. As for the case where the second battery pack B2 is caused to perform the discharging operation and to charge the first battery pack B1, similarly to the case where the first battery pack B1 charges the second battery pack B2, the description thereof will be omitted.
In step S14, it is determined whether the charging operation and the discharging operation are completed simultaneously; and
in step S15, in a case where it is determined that the charging operation and the discharging operation are not simultaneously completed, the connection between the dc bus and the ac power is connected to replenish/discharge the amount of power. Specifically, with the discharging operation of the first battery pack B1 completed and the charging operation of the second battery pack B2 not yet exemplified, the connection between the dc bus 02 and the AC power AC may be connected so that the AC power AC continues to perform the charging operation on the second battery pack B2, thereby preventing the charging flow under test from being interrupted. On the contrary, when the discharging operation of the first battery pack B1 is not completed but the charging operation of the second battery pack B2 is completed as an example, the connection between the dc bus 02 and the AC power AC may be connected to feed back the surplus power to the grid where the AC terminal AC is located, thereby avoiding the waste of energy.
In this example, considering that the battery pack needs to consider the stability of power transmission when discharging or charging, the method may further include at least a part of the steps as shown in fig. 6. The difference from the method shown in fig. 5 is that, in fig. 6, step S15 further includes:
in step S24, it is determined whether the power of the charging operation is equal to the power of the discharging operation;
in step S25, in a case where it is determined that the power of the charging operation is not equal to the power of the discharging operation, the connection between the direct-current bus and the alternating-current power is connected to replenish/discharge the power.
In yet another aspect, the present disclosure also provides a storage medium that may store instructions that are readable by a machine to cause the machine to perform any of the methods described above.
Through the technical scheme, the utility model provides a multiport energy semi-enclosed transformer substation storage battery charge and discharge testing arrangement and method in storage battery test process, charge, discharge the group battery can realize that the electricity of energy between two types of battery packs is sealed. If the discharged electric quantity or power of the discharge battery pack cannot meet the requirement of the charge battery pack, the shortage part can supplement the electric quantity or power of the charge battery pack through alternating current rectification on the side of a power grid; if the electric energy of the discharging storage battery is not discharged completely, the charging battery pack is fully charged, or the output power of the discharging storage battery is larger than the charging power of the charging storage battery, and the redundant electric energy or power is fed back to the power grid through the power grid side. Compared with the prior art, the electric energy can be efficiently utilized, and the testing speed of the storage battery is improved.
The above describes in detail optional embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details of the above embodiments, and the technical concept of the embodiments of the present invention can be within the scope of the present invention, and can be modified in a variety of ways, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention can be combined arbitrarily, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.
Claims (6)
1. A multiport energy semi-enclosed substation battery charge and discharge testing arrangement, the device is used for testing at least two sets of group battery, its characterized in that includes:
a direct current bus;
at least two DC/DC modules, wherein each group of the battery packs is connected with a direct current bus through at least one DC/DC module;
the AC/DC module is used for connecting an alternating current end to an alternating current, and a direct current end is connected with the direct current bus; and
and the control unit is connected with the DC/DC module and the AC/DC module and is used for controlling the work of the DC/DC module and the AC/DC module.
2. The apparatus of claim 1, wherein the control unit comprises:
an AC/DC controller for controlling the AC/DC module;
the DC/DC controllers correspond to the DC/DC modules one by one and are used for controlling the corresponding DC/DC modules; and
and the system control module is used for sending control instructions to the DC/DC controller and the AC/DC controller.
3. The apparatus of claim 2, wherein the DC/DC module comprises:
a first controllable switch, a first end of which is connected with the DC/DC controller, and a second end of which is used for being connected to a positive phase line of the direct current bus;
a first end of the second controllable switch is connected with the DC/DC controller, and a second end of the second controllable switch is connected with a third end of the first controllable switch;
one end of the first inductor is connected with the third end of the first controllable switch, and the other end of the first inductor is used for being connected to the positive phase line; and
and one end of the first capacitor is connected with the third end of the second controllable switch, and the other end of the first capacitor is connected with the other end of the first inductor.
4. The apparatus of claim 3, wherein the DC/DC controller comprises:
the first driving circuit is used for being connected with the first ends of the first controllable switch and the second controllable switch;
the first sampling conditioning circuit is used for collecting the current of a node between the other end of the first inductor and a negative phase line, the current of a node between the other end of the first inductor and the other end of the first capacitor, the voltage of the direct-current bus and the voltage of the battery pack;
one end of the first PWM modulation module is connected with the first driving circuit; and
and the first end of the first DSP controller is connected with the first PWM modulation module, the second end of the first DSP controller is connected with the first sampling conditioning circuit, the third end of the first DSP controller is connected with the system control module, and the fourth end of the first DSP controller is connected with an external monitoring panel.
5. The apparatus of claim 4, wherein the AC/DC module comprises:
the second capacitor is used for connecting one end of the second capacitor to a positive phase line of the direct current bus and connecting the other end of the second capacitor to a negative phase line of the direct current bus;
a third controllable switch, a first terminal of which is connected with the AC/DC controller, and a second terminal of which is connected with one terminal of the second capacitor;
a fourth controllable switch having a first terminal connected to the AC/DC controller and a second terminal connected to a second terminal of the third controllable switch;
a first end of the third controllable switch is connected with the first end of the first capacitor, a second end of the third controllable switch is connected with a third end of the third capacitor, and the third end of the third controllable switch is connected with the other end of the second capacitor;
a first end of the sixth controllable switch is connected with the AC/DC controller, a second end of the sixth controllable switch is connected with a third end of the fourth controllable switch, and the third end of the sixth controllable switch is connected with the other end of the second capacitor;
one end of the second inductor is connected with the third end of the fourth controllable switch; and
and a first end of the mutual inductor is connected with the other end of the second inductor, a second end of the mutual inductor is connected with a third end of the third controllable switch, and the third end and the fourth end of the mutual inductor are used for being connected to the alternating current.
6. The apparatus of claim 5, wherein the AC/DC controller comprises:
a second driving circuit, configured to be connected to first ends of the third controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch;
the second sampling conditioning circuit is used for collecting the current of the positive phase line, the voltage between the positive phase line and the negative phase line, the voltage of a node between one end of the second inductor and the second end of the transformer and the current of the second end of the transformer;
one end of the second PWM modulation module is connected with the second driving circuit;
and the first end of the second DSP controller is connected with the first PWM modulation module, the second end of the second DSP controller is connected with the second sampling conditioning circuit, the third end of the second DSP controller is connected with the system control module, and the fourth end of the second DSP controller is used for being connected with an external monitoring panel.
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