CN114826012A - Power conversion device, power system and control method - Google Patents

Power conversion device, power system and control method Download PDF

Info

Publication number
CN114826012A
CN114826012A CN202210525604.2A CN202210525604A CN114826012A CN 114826012 A CN114826012 A CN 114826012A CN 202210525604 A CN202210525604 A CN 202210525604A CN 114826012 A CN114826012 A CN 114826012A
Authority
CN
China
Prior art keywords
unit
power supply
power
rectification
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210525604.2A
Other languages
Chinese (zh)
Inventor
樊炯
郑志鸿
王晓杰
朱鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Huichuan Control Technology Co Ltd
Original Assignee
Suzhou Huichuan Control Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Huichuan Control Technology Co Ltd filed Critical Suzhou Huichuan Control Technology Co Ltd
Priority to CN202210525604.2A priority Critical patent/CN114826012A/en
Publication of CN114826012A publication Critical patent/CN114826012A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power supply conversion device, a power supply system and a control method, and relates to the technical field of power electronics. The power conversion device includes: the power supply comprises a first power supply port, a second power supply port, a rectification inversion unit and a control unit; when the first power supply port is connected with a first power supply, the control unit controls the rectification inversion unit to rectify the first power supply and transmit the rectified power supply to the second power supply port, or when the second power supply port is connected with a second power supply, the control unit controls the rectification inversion unit to invert the second power supply and transmit the inverted power supply to the first power supply port. The invention realizes the rectification and inversion of the power supply under the control of the control unit by arranging the rectification and inversion unit compatible with rectification and inversion, does not need to independently configure rectification equipment and inversion equipment, and improves the integration level of the power system.

Description

Power conversion device, power system and control method
Technical Field
The invention relates to the technical field of power electronics, in particular to a power conversion device, a power system and a control method.
Background
At present, in order to ensure sufficient energy of a power system, an energy storage battery is gradually widely applied, the energy storage battery is subjected to inversion output parameters when the power of the power system is surplus, and the energy storage battery is used for discharging when the power is deficient. In a high-power system, the load is mostly ac, and the charging source of the energy storage battery is usually dc, so the energy storage battery needs to be provided with corresponding charging equipment and discharging equipment. Because the charging equipment and the discharging equipment are independent equipment in the existing power system, the system cost is improved, the occupied area of the equipment is increased, the fault points of the system are increased, and the usability of the system is reduced.
Disclosure of Invention
The invention mainly aims to provide a power conversion device, a power system and a control method, and aims to solve the technical problem that the equipment integration level in a power system is low in the prior art.
In order to achieve the above object, the present invention provides a power conversion apparatus, including:
a first power port and a second power port;
the alternating current side of the rectification inversion unit is connected with the first power supply port, and the direct current side of the rectification inversion unit is connected with the second power supply port;
and the control unit is connected with the rectification inversion unit and is configured to control the rectification inversion unit to rectify the first power supply and transmit the rectified power supply to the second power supply port when the first power supply port is connected with the first power supply, or control the rectification inversion unit to invert the second power supply and transmit the inverted power supply to the first power supply port when the second power supply port is connected with the second power supply.
Optionally, the power conversion apparatus further includes:
the first switch is arranged between the alternating current side of the rectification inverter unit and the first power supply port;
the second switch is arranged between the direct current side of the rectification inverter unit and the second power supply port;
and the control unit is also connected with the first switch and the second switch and is configured to control the on or off of the first switch and the second switch.
Optionally, the power conversion apparatus further includes:
the first pre-charging unit is arranged between the alternating current side of the rectification inverter unit and the first power supply port and is connected with the first switch in parallel;
and the control unit is also connected with the first pre-charging unit and is configured to control the first pre-charging unit to pre-charge the rectification inverter unit when the first power supply port is connected with the first power supply, and control the first switch to be closed after the pre-charging is finished so that the rectification inverter unit rectifies the first power supply.
Optionally, the power conversion apparatus further includes:
the second pre-charging unit is arranged between the direct current side of the rectification inverter unit and the second power supply port and is connected with the second switch in parallel;
and the control unit is also connected with the second pre-charging unit and is configured to control the second pre-charging unit to pre-charge the rectification inversion unit when the second power supply port is connected with a second power supply, and control the second switch to be closed after pre-charging is finished so that the rectification inversion unit inverts the second power supply.
Optionally, the power conversion device is connected to a grid-connected power supply unit, the grid-connected power supply unit has at least one input end and an output end, the input end is connected to the first power port, and the grid-connected power supply unit is configured to integrate the power supply accessed from the input end and provide an output power to the output end;
the power conversion apparatus further includes:
the grid-connected sampling unit is connected with the grid-connected power supply unit and is configured to acquire grid-connected output parameters of the output power supply;
and the control unit is also connected with the grid-connected sampling unit and is configured to control the rectification inversion unit to invert the second power supply according to the grid-connected output parameters.
Optionally, the grid-connected output parameters include voltage, phase and frequency;
the control unit is configured to control the rectification inversion unit to provide a power supply source for the grid-connected power supply unit when a grid-connected instruction is received, and the power supply source and the output power source have the same voltage, phase and frequency;
and the control unit is configured to gradually increase the power of the power supply when the rectification inverter unit starts to provide the power supply until the power of the power supply reaches the preset power.
Optionally, the power conversion apparatus further includes:
a communication unit configured to receive the inverted output parameter;
and the control unit is also connected with the communication unit and is configured to control the rectification inversion unit to invert the second power supply so that the inverted power supply parameters are inversion output parameters.
In order to achieve the above object, the present invention further provides a power supply system, which includes a battery pack and the above power conversion device, wherein the battery pack is connected to the second power port.
Optionally, the power supply system further includes a distribution board and at least one power supply device, and the distribution board is connected to the first power port and the power supply device, respectively.
Optionally, the power supply system further includes a power management unit and a battery management unit, and the control unit is further connected to the power management unit and the battery management unit;
the control unit is configured to control the rectification inversion unit according to the power parameters transmitted by the power management unit so that the inverted power supply has power parameters;
and the control unit is configured to control the rectification inverter unit according to the voltage or current parameters transmitted by the battery management unit, so that the rectified power supply has the voltage or current parameters.
In order to achieve the above object, the present invention further provides a control method of a power conversion apparatus, where the power conversion apparatus includes a rectification inverter unit, a first pre-charge unit, a first switch, a second switch, a first power port, and a second power port, the first pre-charge unit and the first switch are arranged between an ac side of the rectification inverter unit and the first power port in parallel, and the second switch is arranged between a dc side of the rectification inverter unit and the second power port;
the control method comprises the following steps:
when the first power supply port is connected with an alternating current power supply, the first pre-charging unit is controlled to pre-charge the rectification inversion unit by using the alternating current power supply;
after the pre-charging is finished, controlling the first switch to be closed so that the rectification inversion unit rectifies the alternating current power supply;
and after the bus voltage of the rectification inverter unit is stable, the second switch is controlled to be closed, and a direct-current power supply is provided for the second power supply port.
Optionally, the power conversion apparatus further includes a second pre-charging unit, and the second pre-charging unit is connected in parallel with the second switch;
the control method further comprises the following steps:
when the second power supply port is connected with the direct-current power supply, the second pre-charging unit is controlled to pre-charge the rectification inverter unit by using the direct-current power supply;
after the pre-charging is finished, controlling the second switch to be closed so that the rectification inversion unit inverts the direct-current power supply;
and after the bus voltage of the rectification inverter unit is stable, the first switch is controlled to be closed, and an alternating current power supply is provided for the first power supply port.
Optionally, the power conversion device is connected with a grid-connected unit, and the grid-connected unit is also connected with a generator set;
the control method further comprises the following steps:
when a parallel operation instruction is received, acquiring output parameters of a generator set;
controlling the rectification inversion unit to be in a discharge mode, and controlling the output parameters of the rectification inversion unit to be the same as the output parameters of the generator set;
and controlling the first switch to be closed, and gradually increasing the output frequency of the rectification inverter unit to a first set frequency.
Optionally, the control method further includes:
when a splitting instruction is received, controlling the output frequency of the rectification inverter unit to be reduced to a second set frequency;
controlling the first switch to be switched off and controlling the rectification inverter unit to stop;
and controlling the second switch to be switched off.
In the invention, a power conversion device is formed by arranging a first power port, a second power port, a rectification inversion unit 30 and a control unit, wherein the control unit is configured to control the rectification inversion unit to rectify a first power supply and transmit the rectified power supply to the second power port when the first power port is connected with the first power supply, or control the rectification inversion unit to invert a second power supply and transmit the inverted power supply to the first power port when the second power port is connected with the second power supply. The invention realizes the rectification and inversion of the power supply under the control of the control unit by arranging the rectification and inversion unit compatible with rectification and inversion, does not need to independently configure rectification equipment and inversion equipment, and improves the integration level of the power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a power conversion device according to a first embodiment of the present invention;
FIG. 2 is a block diagram of a power conversion device according to a second embodiment of the present invention;
FIG. 3 is a block diagram of a power conversion device according to a third embodiment of the present invention;
FIG. 4 is a block diagram of a first embodiment of a power supply system according to the present invention;
FIG. 5 is a block diagram of a fourth embodiment of the power conversion device of the present invention;
fig. 6 is a flowchart illustrating a control method of a power conversion apparatus according to a first embodiment of the invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
10 First power supply port 120 Grid-connected power supply unit
20 Second power supply port 130 Grid-connected sampling unit
30 Rectification inversion unit 140 AC side sampling unit
40 Control unit 150 Direct current side sampling unit
50 First switch 160 Communication unit
60 Second switch 170 Battery pack
70 First precharge unit 180 Power supply conversion device
80 Second precharge unit 190 Distribution board
90 Filter unit 200 Power supply device
100 Human-computer interaction unit 210 Power management unit
110 Power supply conversion unit 220 Battery management unit
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only configured to explain the relative position relationship between the components, the movement condition, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are configured for descriptive purposes only and are 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 may 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 cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a power conversion device according to a first embodiment of the present invention. The invention provides a first embodiment of a power conversion device.
As shown in fig. 1, in the present embodiment, the power conversion apparatus includes a first power port 10, a second power port 20, a rectifying and inverting unit 30, and a control unit 40. The alternating current side of the rectification inverter unit 30 is connected to the first power port 10, the direct current side of the rectification inverter unit 30 is connected to the second power port 20, and the control unit 40 is connected to the rectification inverter unit 30. The control unit 40 is configured to control the rectification and inversion unit 30 to rectify the first power source and transmit the rectified power to the second power port 20 when the first power port 10 is connected to the first power source, or control the rectification and inversion unit 30 to invert the second power source and transmit the inverted power to the first power port 10 when the second power port 20 is connected to the second power source.
It should be noted that the first power source is an alternating current, which is a power source provided by a commercial power or other alternating current power supply equipment; the second power source is direct current, which may typically be the power source provided by a battery or other direct current powered device.
The ac side of the rectification and inversion unit 30 has ac electrical connection ports, such as a neutral line and a live line, or a three-phase electrical interface. The ac side of the rectification/inversion unit 30 has dc electrical connection ports, such as a positive electrode port and a negative electrode port. The rectification and inversion unit 30 can simultaneously perform rectification and inversion. In general, in the rectification process, current channels are respectively arranged on the positive half cycle and the negative half cycle of the alternating current, and the output ends of the two current channels are the same, so that the positive half cycle current and the negative half cycle current are output in the same direction. The inversion process is reversed. A conventional rectifying unit has a bridge circuit formed by a plurality of diodes, and input terminals and output terminals of the bridge circuit are arranged to intersect. However, the rectifier bridge cannot realize inversion because the current cannot flow in the reverse direction due to the unidirectional conductivity of the diode.
In the present embodiment, each rectifier bridge in the rectifying and inverting unit 30 employs a bidirectional controllable switch, and current can flow in any direction of the switch, such as a Metal-Oxide-Semiconductor (MOS) transistor. In addition, in order to ensure the output temperature of the direct current side, the direct current side can be further provided with an energy storage capacitor so as to eliminate the voltage fluctuation of the direct current side. The specific circuit configuration within the rectifying and inverting unit 30 is related to the type of power source that needs to be processed. If the first power source is a single-phase ac power, the rectification inverter unit 30 may be a rectifier bridge formed by connecting 4 MOS transistors end to end. If the first power supply is a three-phase ac power supply, the rectification inverter unit 30 may be a three-phase rectification unit formed by 6 MOS transistors, and the specific circuit structure of the three-phase rectification unit has been the mature technology, and the detailed description of the embodiment is omitted here. Of course, the rectification and inversion unit 30 may be other types of rectification units.
The control unit 40 may be connected to the gate of each MOS transistor in the rectification inverter unit 30, and controls the on/off of each MOS transistor by generating a PWM (Pulse width modulation) signal, and the like, so as to control the power conversion process of the rectification inverter unit 30. When three-phase alternating current is connected to the first power port 10, the control unit 40 controls the MOS transistors to be alternately conducted, so that the rectifier bridge rectifies the three-phase alternating current to obtain direct current. When the first power port 10 is connected with the direct current, the control unit 40 controls the MOS transistors to be alternately turned on, so that the rectifier bridge inverts the direct current or three-phase alternating current.
In the present embodiment, the first power port 10, the second power port 20, the rectification/inversion unit 30, and the control unit 40 are provided to constitute a power conversion device, and the control unit 40 is configured to control the rectification/inversion unit 30 to rectify the first power and transmit the rectified power to the second power port 20 when the first power port 10 is connected to the first power, or control the rectification/inversion unit 30 to invert the second power and transmit the inverted power to the first power port 10 when the second power port 20 is connected to the second power. In the embodiment, the rectification and inversion unit 30 compatible with rectification and inversion is arranged, rectification and inversion of the power supply are realized under the control of the control unit 40, and a rectification device and an inversion device do not need to be independently configured, so that the integration level of the power system is improved.
Referring to fig. 2, fig. 2 is a block diagram of a power conversion device according to a second embodiment of the present invention. Based on the first embodiment, the present invention provides a second embodiment of the power conversion apparatus.
In the present embodiment, the rectification and inversion of the power conversion device are more easily controlled. The power conversion apparatus may further include a first switch 50 and a second switch 60. Wherein the first switch 50 is disposed between the ac side of the rectification inverter unit 30 and the first power port 10; the second switch 60 is disposed between the dc side of the rectification inverter unit 30 and the second power port 20; the control unit 40 is also connected to the first switch 50 and the second switch 60, and is configured to control the closing or opening of the first switch 50 and the second switch 60.
In order to stabilize the output during rectification or inversion, the control unit 40 controls each node during rectification or inversion by closing or opening the first switch 50 and the second switch 60. When the power conversion apparatus is not operating, the first switch 50 and the second switch 60 are in the off state. When the first power is applied to the first power port 10 or the second power is applied to the second power port 20, the control unit 40 may start a rectification process or an inversion process according to the setting. The setting of the control unit 40 may be performed by a host computer or by a user through the human-computer interaction unit 100. The human-computer interaction unit 100 may include a display screen, an input device, and the like, and the specific hardware structure thereof has a mature technology, which is not described in detail in this embodiment. For the interaction logic between the human-computer interaction unit 100 and the control unit 40, the device may be performed according to the user requirement, which is not limited in this embodiment.
For example, in the rectification process, when the first power is applied to the first power port 10, the control unit 40 may first control the first switch 50 to be closed. Meanwhile, the control unit 40 controls the rectification and inversion unit 30 to rectify the first power by generating a corresponding PWM signal. Then, after the dc side voltage of the rectifying and inverting unit 30 is stabilized, the control unit 40 controls the second switch 60 to be closed, and the rectified power is transmitted to the second power port 20. In the inversion process, when the second power is applied to the second power port 20, the control unit 40 first controls the second switch 60 to be closed. Meanwhile, the control unit 40 controls the rectification and inversion unit 30 to invert the second power by generating a corresponding PWM signal. Then, after the voltage on the ac side of the rectifying and inverting unit 30 is stabilized, the control unit 40 controls the first switch 50 to be closed, and the inverted power is transmitted to the first power port 10.
Meanwhile, a filtering unit 90 may be further disposed between the first switch 50 and the ac side of the rectification inverter unit 30. The filtering unit 90 is used for filtering the alternating current and providing active damping for the rectifying and inverting unit 30. The filtering unit 90 may adopt devices such as an inductor and a capacitor, and the specific structure thereof also has a mature technology, which is not described herein in detail in this embodiment.
In the present embodiment, in order to reduce the consumption of the power supply built in the power conversion apparatus, the power conversion apparatus is further provided with a power conversion unit 110 for supplying power to the control unit 40. The power conversion unit 110 may have a dc step-down function, and an input terminal thereof is connected to the second power port 20 to convert the dc side power into a required power suitable for the control unit 40. In addition, in order to protect the rectifying and inverting unit 30, the power conversion apparatus may further include a first pre-charging unit 70 and a second pre-charging unit 80. The first pre-charging unit 70 is disposed between the ac side of the rectifying and inverting unit 30 and the first power port 10, and the first pre-charging unit 70 is connected in parallel to the first switch 50. The second pre-charging unit 80 is disposed between the dc side of the rectifying and inverting unit 30 and the second power port 20, and the second pre-charging unit 80 is connected in parallel to the second switch 60. The control unit 40 is connected to the first and second pre-charge units 70 and 80, respectively.
The first and second precharge units 70 and 80 have a current-limiting switch structure, and when the switches in the first and second precharge units 70 and 80 are closed, the current flowing through the switches can be limited by the impedance unit. Since the capacitor devices in the rectification inverter unit 30 are susceptible to a large impact when being powered on, each capacitor device is charged by providing a small current to the rectification inverter unit 30 at the initial stage of power on, thereby reducing the impact on each capacitor device.
In a specific implementation, when the first power port 10 is connected to the first power supply, the control unit 40 controls the first pre-charging unit 70 to pre-charge the rectifying and inverting unit 30, and after the pre-charging is completed, controls the first switch 50 to be closed, so that the rectifying and inverting unit 30 rectifies the first power supply. The first pre-charging unit 70 is closed under the control of the control unit 40, limits the current of the input first power supply, and provides the three-phase power with a small current to the rectification and inversion unit 30; the rectifying and inverting unit 30 rectifies the three-phase power based on the small current under the control of the control unit 40 to obtain a rectified power with a small current, which can be regarded as a pre-charging process of the first pre-charging unit 70 on the rectifying and inverting unit 30. After the voltage of the dc-side low-current rectified power supply is stabilized, it can be regarded that the precharge is completed, and at this time, the control unit 40 may control the first precharge unit 70 to be opened and the first switch 50 to be closed.
When the second power port 20 is connected to the second power source, the control unit 40 controls the second pre-charging unit 80 to pre-charge the rectifying and inverting unit, and after the pre-charging is completed, controls the second switch 60 to be closed, so that the rectifying and inverting unit 30 inverts the second power source. The second pre-charging unit 80 is closed under the control of the control unit 40, limits the current of the input second power supply, and provides the low-current direct current to the rectification inverter unit 30; the rectifying and inverting unit 30 inverts the dc power based on the small current under the control of the control unit 40 to obtain an ac power with a small current, which can be regarded as a pre-charging process of the second pre-charging unit 80 to the rectifying and inverting unit 30. After the voltage of the dc power with a small current on the dc side is stabilized, it can be regarded that the precharge is completed, and at this time, the control unit 40 may control the second precharge unit 80 to be opened and the second switch 60 to be closed.
In the embodiment, the switching circuits are arranged on the direct current side and the alternating current side of the rectification inversion unit 30, so that the rectification or inversion process of the rectification inversion unit 30 is controlled conveniently, the rectified power supply or the inverted power supply is more stable in output, and the stability of the power system is ensured.
Referring to fig. 3, fig. 3 is a block diagram of a power conversion device according to a third embodiment of the present invention. Based on the first and second embodiments described above, the present invention proposes a third embodiment of a power conversion apparatus.
In the present embodiment, the power conversion device is connected to a grid-connected power supply unit 120, the grid-connected power supply unit 120 has at least one input terminal and an output terminal, the input terminal is connected to the first power port 10, and the grid-connected power supply unit 120 is configured to integrate a power supply accessed by the input terminal and provide an output power to the output terminal. The power conversion device further comprises a grid-connected sampling unit 130, wherein the grid-connected sampling unit 130 is connected with the grid-connected power supply unit 120 and is configured to acquire grid-connected output parameters of the output power supply; the control unit 40 is further connected to the grid-connected sampling unit 120, and is configured to control the rectification and inversion unit 30 to invert the second power according to the grid-connected output parameters.
For most power systems, the power supply equipment is usually provided with a plurality of devices, such as an island grid or a micro grid. In such a power system, it is necessary to control the parallel operation and the disconnection of the power supply apparatuses. The parallel operation is to connect the power supply equipment into the power grid, and the disconnection is to separate the power supply equipment from the power grid. The second power port 20 of the power conversion device in this embodiment can be connected to a battery pack (such as a lithium battery) to form a power supply device. Other power supply equipment in the power system can also be equipment formed by a power conversion device and a battery pack, such as a diesel generator, a wind driven generator and the like.
The grid-connected power supply unit 120 is used to implement distribution of power, and may be an ac distribution board. The input and output terminals in the grid-tied power supply unit 120 may be exchanged in some cases. For example, the power conversion device may operate in a discharging mode, in which the port of the grid-connected power supply unit 120 connected to the first power port 10 serves as an input terminal to access the power provided by the power conversion device. Or the power conversion apparatus may operate in a charging mode, and the grid-connected power supply unit 120 supplies power to the power conversion apparatus, with a port connected to the first power port 10 as an output terminal.
In the present embodiment, in order to make the discharge power source of the power conversion device meet the power supply requirement of the power system, the grid-connected sampling unit 130 is provided to collect the grid-connected output parameters of the grid-connected power supply unit 120, and the control unit 40 controls the rectification inverter unit 30 to output the power source having the same parameters as the grid-connected output parameters.
In particular implementations, the grid-tied output parameters may include voltage, phase, and frequency. And a control unit 40 configured to control the rectification and inversion unit 30 to provide a power supply to the grid-connected power supply unit 120 when the grid-connected instruction is received, wherein the power supply has the same voltage, phase and frequency as the output power. And the control unit 40 is configured to gradually increase the power of the power supply source when the rectification inverter unit 30 starts to provide the power supply source until the power of the power supply source reaches a preset power.
The grid-connected instruction may be sent by an upper computer, and after receiving the grid-connected instruction, the control unit 40 controls the rectification and inversion unit 30 to perform the discharge mode, and the specific control process of the discharge mode may refer to the foregoing. The control unit 40 generates a corresponding PWM signal to make the rectification inversion unit 30 invert the power provided by the battery pack, and then controls the first switch 50 to be closed when the power parameter of the ac side reaches the voltage, phase and frequency of the grid-connected power supply unit 120, so that the power of the ac side is transmitted to the grid-connected power supply unit 120.
After the rectification inverter unit 30 is connected to the power system, the power is low. In order to balance the load of the power system, the control unit 40 controls the power supply output by the rectification inverter unit 30 to gradually increase to share the load. The specific power parameter may be set according to a requirement, for example, when the power system includes only one generator, the power of the power source output by the rectification and inversion unit 30 may be equal to the power of the generator. Or, the control unit 40 may also receive a power parameter transmitted by the upper computer, and control the rectification and inversion unit 30 to output according to the power parameter.
In addition, the control unit 40 may further control the power supply output by the rectification and inversion unit 30 to gradually decrease and transfer its own load after receiving the dissociation instruction. Then, the first switch 50 is turned off to stop the operation of the rectification inverter unit 30; finally the second switch 60 is opened.
In addition, in order to enable the control unit 40 to more accurately control the rectification and inversion processes of the rectification and inversion unit 30, the power conversion apparatus may further include an ac-side sampling unit 140 and a dc-side sampling unit 150. The ac side sampling unit 104 is configured to collect power parameters of the ac side of the rectification and inversion unit 30, and the dc side sampling unit 150 is configured to collect power parameters of the dc side of the rectification and inversion unit 30, where the power parameters may include voltage, current, phase, frequency, and the like. The specific structure of each sampling unit has a mature technology, such as a hall sensor, and the like, and the detailed description of the embodiment is omitted here.
In this embodiment, the power conversion apparatus may further include a communication unit 160 to facilitate adjustment of the power conversion apparatus. The communication unit 160 is configured to receive the inverted output parameter; the control unit 40 is further connected to the communication unit 160, and configured to control the rectification and inversion unit 30 to invert the second power supply, so that the inverted power parameter is an inverted output parameter.
It is understood that when other power supply devices in the power system do not have communication capability (such as diesel generators, etc.), the power conversion device needs to actively follow the output of such power supply devices. When other power supply equipment in the power system has communication capability, the power conversion device can communicate with the power supply equipment, and the output parameters of the power supply equipment are determined through calculation. For example, the power system includes a plurality of power conversion devices, and the control unit 40 in each power conversion device can establish a connection via the communication unit 160 to adjust the output voltage, frequency, and phase of each power conversion device to be uniform. And then controls the rectification inversion unit 30 to output a corresponding power to the grid-connected power supply unit 120.
In this embodiment, the power conversion device is connected to the grid-connected power supply unit 120, and the power conversion device controls the rectification inverter unit 30 to increase the corresponding power supply by acquiring the grid-connected output parameters of the power output by the grid-connected power supply unit 120, so as to ensure stable power supply of the power system.
Referring to fig. 4, fig. 4 is a block diagram of a power supply system according to a first embodiment of the present invention. In order to achieve the above object, the present invention further provides a power supply system, which includes a battery pack 170 and the above power conversion device 180, wherein the power conversion device 180 has a second power port 20 and a rectification and inversion unit 30, the second power port is connected to the dc side of the rectification and inversion unit 30, and the battery pack is connected to the second power port 20.
Specific structure of the power conversion apparatus 180 referring to the above-described embodiment, the power conversion apparatus 180 may charge the battery pack 170 with alternating current and convert discharge of the battery pack 170 into direct current. Since the power supply system can adopt the technical solutions of all the embodiments, the power supply system at least has the beneficial effects brought by the technical solutions of the embodiments, and details are not repeated herein.
In addition, in the present embodiment, the power supply system further includes a distribution board 190 and at least one power supply device 200, the power conversion device 180 further includes a first power port 10, the first power port 10 is connected to the ac side of the rectification inverter unit 30, and the distribution board 190 is connected to the first power port 10 and the power supply device 200, respectively.
The power conversion device 180 and the power supply device 200 together form a multi-power-supply power system, wherein the power supply device 200 may also be a device formed by the power conversion device and a battery pack, or such as a diesel generator, a wind generator, etc. The distribution board 190 is used to distribute output power of the power conversion device 180 and the power supply device 200, or to transmit power of the power supply device 200 to the power conversion device 180, so as to charge the battery pack 170.
Referring to fig. 5, fig. 5 is a block diagram illustrating a fourth embodiment of the power conversion apparatus of the present invention. The power conversion apparatus 180 further has a control unit 40, the power system further includes a power management unit 210 and a battery management unit 220, and the control unit 40 is further connected to the power management unit 210 and the battery management unit 220.
The power management unit 210 is used to set the output power of each power supply device in the power supply system, and the battery management unit 220 is used to detect the state of the battery pack 170. The control unit 40 may control the rectification and inversion unit 30 according to the power parameter transmitted by the power management unit 210, so that the inverted power source has the power parameter. The control unit 40 may control the rectification and inversion unit according to the voltage or current parameter transmitted by the battery management unit 220, so that the rectified power has the voltage or current parameter.
The power management unit 210 distributes power of each power supply apparatus according to a load state in the power supply system. For example, the power of each power supply device may be made the same, and then the corresponding power parameter may be transmitted to the power supply device. The control unit 40 may communicate with the power management unit 210, and receive the power parameter, thereby controlling the power source of the corresponding power output by the rectification and inversion unit 30.
The battery management unit 220 may determine a corresponding charging voltage or current according to the state of the battery pack 170, transmit the charging voltage to the control unit 40, and the control unit 40 controls the rectifying and inverting unit 30 to output a power source of the corresponding voltage or current, so as to improve the charging efficiency of the battery pack 170. The battery management unit 220 may also transmit a failure signal to the control unit 40 when the battery pack 170 fails. After receiving the fault signal, the control unit 40 controls the rectification and inversion unit 30 to stop working.
The power supply system in the embodiment can be suitable for various island power grids, such as a ship power system (a pure battery ship and a diesel-electric hybrid power ship), the equipment integration level of the power supply system is high, the cost is low, the fault points of the system are reduced, and the reliability of the power supply system is higher.
Referring to fig. 6, fig. 6 is a flowchart illustrating a control method of a power conversion apparatus according to a first embodiment of the present invention. To achieve the above object, the present invention also provides a first embodiment of a control method of a power conversion apparatus.
In this embodiment, the power conversion apparatus includes a rectification inverter unit, a first pre-charge unit, a first switch, a second switch, a first power port, and a second power port, where the first pre-charge unit and the first switch are disposed in parallel between the ac side of the rectification inverter unit and the first power port, and the second switch is disposed between the dc side of the rectification inverter unit and the second power port.
In the present embodiment, the control method includes:
step S10: when the first power supply port is connected with an alternating current power supply, the first pre-charging unit is controlled to pre-charge the rectification inverter unit by using the alternating current power supply.
The power conversion device further includes a control unit, and the control unit is respectively connected to the rectification inverter unit, the first pre-charging unit, the first switch, and the second switch. The execution body of the present embodiment may be the control unit.
The first power port may be connected to an external power source (a power source provided by mains or other ac power supply equipment) via a switch (e.g., a switch) or the like. When rectification is needed, the control unit can communicate with an external control system to enable the external control system to control the switch to be closed, or the control unit directly controls the switch to be closed to enable the first power supply port to be connected with the alternating current power supply.
The first precharge unit has a current limit switch structure, and when a switch therein is closed, the current flowing through the first precharge unit can be limited by the impedance unit. Because the capacitor devices in the rectification inverter unit are easy to be impacted greatly when being electrified, the capacitor devices are charged by providing smaller current for the rectification inverter unit at the initial stage of electrification, and the impact on the capacitor devices is reduced.
Step S20: after the pre-charging is finished, the first switch is controlled to be closed, so that the rectification inversion unit rectifies the alternating current power supply.
It should be noted that the precharge time of the first precharge unit may be set in advance, and after the precharge time reaches the set time, the completion of the precharge is determined, and the first precharge unit is controlled to be turned off and the first switch is turned on. Alternatively, the voltage on the dc side of the rectifying/inverting unit is detected, and after the voltage on the dc side is stabilized, it is determined that the precharge is completed.
Step S30: and after the bus voltage of the rectification inverter unit is stable, the second switch is controlled to be closed, and a direct-current power supply is provided for the second power supply port.
In order to ensure the stability of the output direct-current voltage, the second switch can be controlled to be closed after the bus voltage of the rectification inverter unit is stable. The second power port may be connected to a battery pack and the dc power source may be used to charge the dc power source. Therefore, the control unit can also detect the electric quantity of the battery pack, and when the electric quantity is insufficient, the rectification process is executed.
In this embodiment, the power conversion apparatus further includes a second pre-charge unit connected in parallel with the second switch; the control method may further include: when the second power supply port is connected with the direct-current power supply, the second pre-charging unit is controlled to pre-charge the rectification inverter unit by using the direct-current power supply; after the pre-charging is finished, controlling the second switch to be closed so that the rectification inversion unit inverts the direct-current power supply; and after the bus voltage of the rectification inverter unit is stable, the first switch is controlled to be closed, and an alternating current power supply is provided for the first power supply port.
The second pre-charging unit is provided with a current-limiting switch structure, and when a switch is closed, the current flowing through the second pre-charging unit can be limited by using the impedance unit. The setting of the precharge may refer to the foregoing. When the second power port is connected to the battery pack, the power conversion device may supply ac power to the outside using the battery pack. Specifically, when receiving the discharge instruction, the control unit may execute the above procedure to convert the dc power supply of the battery pack into the ac power supply for discharging.
In the embodiment, the power conversion device is connected with a grid-connected unit, and the grid-connected unit is also connected with a generator set; the control method further comprises the following steps: when a parallel operation instruction is received, acquiring output parameters of a generator set; controlling the rectification inversion unit to be in a discharge mode, and controlling the output parameters of the rectification inversion unit to be the same as the output parameters of the generator set; and controlling the first switch to be closed, and gradually increasing the output frequency of the rectification inverter unit to a first set frequency.
For most power systems, the power supply equipment is usually provided with a plurality of devices, such as an island grid or a micro grid. In such a power system, it is necessary to control the parallel operation and the disconnection of the power supply apparatuses. The parallel operation is to connect the power supply equipment into the power grid, and the disconnection is to separate the power supply equipment from the power grid. The second power port of the power conversion device can be connected with a battery pack to form power supply equipment. Other power supply equipment in the power system can also be equipment formed by a power conversion device and a battery pack, such as a diesel generator, a wind driven generator and the like.
The grid-connected power supply unit is used for realizing the distribution of electric power, and can be an alternating current distribution board. The input and output of the grid-connected power supply unit may be exchanged in some cases. For example, the power conversion device may operate in a discharging mode, where a port of the grid-connected power supply unit connected to the first power port serves as an input terminal to access power provided by the power conversion device. Or the power conversion device can work in a charging mode, and the grid-connected power supply unit supplies power to the power conversion device, wherein the port connected with the first power supply port is used as an output end.
It should be noted that the output parameters may include voltage, phase and frequency. The grid-connected instruction can be sent by an upper computer, the control unit controls the rectification inversion unit to enter a discharge mode after receiving the grid-connected instruction, and the specific control process of the discharge mode can refer to the above. The control unit can enable the rectification inversion unit to invert the power supply provided by the battery pack by generating a corresponding PWM signal, and then controls the first switch to be closed when the power supply parameter on the AC side reaches the voltage, the phase and the frequency of the generator set, so that the power supply on the AC side is transmitted to the grid-connected power supply unit.
It should be noted that, after the rectification inverter unit is connected to the power system, the power is low. In order to balance the load of the power system, the control unit controls the power supply power output by the rectification inverter unit to gradually rise so as to share the load. The specific power parameter can be set according to requirements, for example, when the power system only includes one generator, the power of the power source output by the rectification inverter unit can be made equal to the power of the generator. Or the control unit can also receive the transmitted power parameter of the upper computer and control the rectification inversion unit to output according to the power parameter.
In the present embodiment, the control method further includes: when a splitting instruction is received, controlling the output frequency of the rectification inverter unit to be reduced to a second set frequency; controlling the first switch to be switched off and controlling the rectification inverter unit to stop; and controlling the second switch to be switched off.
The control unit can also control the power supply power output by the rectification inversion unit to gradually decrease after receiving the dissociation instruction, so as to transfer the load of the control unit. Then the first switch is disconnected, so that the rectification inversion unit stops running; finally, the second switch is turned off.
In the embodiment, the rectification and inversion unit is compatible with rectification and inversion, rectification and inversion of the power supply are realized under the control of the control unit, and a rectification device and an inversion device do not need to be independently configured, so that the integration level of the power system is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (14)

1. A power conversion apparatus, characterized by comprising:
a first power port and a second power port;
the alternating current side of the rectification inversion unit is connected with the first power supply port, and the direct current side of the rectification inversion unit is connected with the second power supply port;
and the control unit is connected with the rectification inversion unit and is configured to control the rectification inversion unit to rectify the first power supply and transmit the rectified power supply to the second power supply port when the first power supply port is connected with the first power supply, or control the rectification inversion unit to invert the second power supply and transmit the inverted power supply to the first power supply port when the second power supply port is connected with the second power supply.
2. The power conversion apparatus according to claim 1, further comprising:
the first switch is arranged between the alternating current side of the rectification inverter unit and the first power supply port;
the second switch is arranged between the direct current side of the rectification inverter unit and the second power supply port;
the control unit is further connected with the first switch and the second switch and configured to control the first switch and the second switch to be switched on or switched off.
3. The power conversion apparatus according to claim 2, further comprising:
the first pre-charging unit is arranged between the alternating current side of the rectification inverter unit and the first power supply port and is connected with the first switch in parallel;
the control unit is further connected with the first pre-charging unit and configured to control the first pre-charging unit to pre-charge the rectification inverter unit when the first power port is connected to the first power supply, and control the first switch to be closed after pre-charging is completed, so that the rectification inverter unit rectifies the first power supply.
4. The power conversion apparatus according to claim 2, further comprising:
the second pre-charging unit is arranged between the direct current side of the rectification inverter unit and the second power supply port and is connected with the second switch in parallel;
the control unit is further connected with the second pre-charging unit and configured to control the second pre-charging unit to pre-charge the rectification and inversion unit when the second power port is connected to the second power supply, and control the second switch to be closed after pre-charging is completed, so that the rectification and inversion unit inverts the second power supply.
5. The power conversion device of any one of claims 1-4, wherein the power conversion device is connected to a grid-connected power supply unit having at least one input and an output, the input being connected to the first power port, the grid-connected power supply unit being configured to integrate power supplied from the input and provide output power to the output;
the power conversion apparatus further includes:
the grid-connected sampling unit is connected with the grid-connected power supply unit and is configured to acquire grid-connected output parameters of the output power supply;
the control unit is also connected with the grid-connected sampling unit and is configured to control the rectification inversion unit to invert the second power supply according to the grid-connected output parameters.
6. The power conversion device of claim 5, wherein the grid-tied output parameters include voltage, phase, and frequency;
the control unit is configured to control the rectification inversion unit to provide the power supply to a grid-connected power supply unit when a grid-connected instruction is received, and the power supply and the output power supply have the same voltage, phase and frequency;
the control unit is configured to gradually increase the power of the power supply source when the rectification inverter unit starts to provide the power supply source until the power of the power supply source reaches a preset power.
7. The power conversion device according to any one of claims 1 to 4, further comprising:
a communication unit configured to receive the inverted output parameter;
the control unit is also connected with the communication unit and is configured to control the rectification inversion unit to invert the second power supply, so that the inverted power supply parameter is the inversion output parameter.
8. A power supply system comprising a battery pack and the power conversion device of any one of claims 1-7, wherein the battery pack is connected to the second power port.
9. The power system of claim 8, further comprising a power distribution board and at least one power supply device, the power distribution board being connected to the first power port and the power supply device, respectively.
10. The power system of claim 8, wherein the power system further comprises a power management unit and a battery management unit, the control unit further connected to the power management unit and the battery management unit;
the control unit is configured to control the rectification and inversion unit according to the power parameter transmitted by the power management unit, so that the inverted power supply has the power parameter;
the control unit is configured to control the rectification inverter unit according to the voltage or current parameter transmitted by the battery management unit, so that the rectified power supply has the voltage or current parameter.
11. The control method of the power conversion device is characterized in that the power conversion device comprises a rectification inversion unit, a first pre-charging unit, a first switch, a second switch, a first power port and a second power port, wherein the first pre-charging unit and the first switch are arranged between the AC side of the rectification inversion unit and the first power port in parallel, and the second switch is arranged between the DC side of the rectification inversion unit and the second power port;
the control method comprises the following steps:
when the first power supply port is connected with an alternating current power supply, the first pre-charging unit is controlled to pre-charge the rectification inverter unit by using the alternating current power supply;
after the pre-charging is finished, controlling the first switch to be closed so that the rectification inversion unit rectifies the alternating current power supply;
and after the bus voltage of the rectification inverter unit is stable, the second switch is controlled to be closed, and a direct-current power supply is provided for the second power supply port.
12. The control method of claim 11, wherein the power conversion apparatus further comprises a second pre-charge unit connected in parallel with the second switch;
the control method further comprises the following steps:
when the second power supply port is connected with a direct-current power supply, the second pre-charging unit is controlled to pre-charge the rectification inverter unit by using the direct-current power supply;
after the pre-charging is finished, controlling the second switch to be closed so that the rectification inversion unit inverts the direct-current power supply;
and after the bus voltage of the rectification inverter unit is stable, the first switch is controlled to be closed, and an alternating current power supply is provided for the first power supply port.
13. The control method according to claim 12, wherein the power conversion device is connected to a grid-connected unit, and the grid-connected unit is further connected to a generator set;
the control method further comprises the following steps:
when a parallel operation instruction is received, acquiring output parameters of the generator set;
controlling the rectification inversion unit to be in a discharge mode, and controlling the output parameters of the rectification inversion unit to be the same as the output parameters of the generator set;
and controlling the first switch to be closed, and gradually increasing the output frequency of the rectification inverter unit to a first set frequency.
14. The control method according to claim 13, characterized by further comprising:
when a splitting instruction is received, controlling the output frequency of the rectification inverter unit to be reduced to a second set frequency;
controlling the first switch to be switched off and controlling the rectification inverter unit to stop;
and controlling the second switch to be switched off.
CN202210525604.2A 2022-05-13 2022-05-13 Power conversion device, power system and control method Pending CN114826012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210525604.2A CN114826012A (en) 2022-05-13 2022-05-13 Power conversion device, power system and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210525604.2A CN114826012A (en) 2022-05-13 2022-05-13 Power conversion device, power system and control method

Publications (1)

Publication Number Publication Date
CN114826012A true CN114826012A (en) 2022-07-29

Family

ID=82516131

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210525604.2A Pending CN114826012A (en) 2022-05-13 2022-05-13 Power conversion device, power system and control method

Country Status (1)

Country Link
CN (1) CN114826012A (en)

Similar Documents

Publication Publication Date Title
CN110803051B (en) Energy storage type charging pile and charging system
CN103684202B (en) Integrated driving and the electric machine controller of charging/discharging function
CN109687722A (en) A kind of integrated multi-mode power converter for electric vehicle and its control method
JP2018093696A (en) Bi-directional on-vehicle charge and discharge system and method
CN103380560A (en) Method and apparatus for providing uninterruptible power
CN210111623U (en) Energy router for small-sized micro-grid
CN104167783A (en) Direct-current power source low ripple wave implementation method and circuits with batteries supplying power continuously
CN110138075A (en) Highly compatible alternating current-direct current mixes distribution system
CN205489668U (en) Electric automobile fills electric pile system
CN108429453B (en) Vehicle-mounted high-voltage inversion conversion device and control method
CN112769181A (en) Bidirectional charging circuit and device of electric power storage equipment and control method
CN103166310B (en) Switch cubicle and the method for work thereof of supply module is established in a kind of
CN213734669U (en) Energy conversion device and vehicle
CN219181416U (en) Power supply circuit and energy storage device
CN208127888U (en) A kind of energy storage is for electrical integrated ups power system
CN209516951U (en) A kind of integrated multi-mode power converter for electric vehicle
CN204290428U (en) A kind of integrate motor drives and battery charging function module
US11780342B2 (en) On-board charging and discharging apparatus, charging and discharging system thereof, and electric vehicle
CN114826012A (en) Power conversion device, power system and control method
CN112803085B (en) Intelligent battery
CN114884109A (en) Starting method of energy storage system comprising internal power supply cascade type power module
CN113949151A (en) Black-start power supply circuit of energy storage converter
CN209626973U (en) Highly compatible alternating current-direct current mixes distribution system
CN110752661A (en) Single-phase series-parallel compensation type UPS (uninterrupted power supply) isolated by bidirectional full-bridge high frequency
JPH08331771A (en) Charge/discharge controller for secondary battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination