CN209881476U - Pre-charging device for energy storage converter - Google Patents
Pre-charging device for energy storage converter Download PDFInfo
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- CN209881476U CN209881476U CN201920818863.8U CN201920818863U CN209881476U CN 209881476 U CN209881476 U CN 209881476U CN 201920818863 U CN201920818863 U CN 201920818863U CN 209881476 U CN209881476 U CN 209881476U
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Abstract
A pre-charging device for an energy storage converter belongs to the technical field of energy storage converters. The utility model discloses a direct current side power, direct current side circuit breaker Q8, resistance R1, resistance R2, diode VD1, rectifier bridge VD2, power module, exchange side major loop contactor KM1, exchange side contactor KM3 and electric wire netting, direct current side power passes through direct current side circuit breaker Q8 and is connected with power module's direct current side, power module's exchange side is passed through exchange side major loop contactor KM1 and is connected with the electric wire netting, rectifier bridge VD 2's output is connected with power module's direct current side, rectifier bridge VD 2's input is passed through exchange side contactor KM3 and is connected on the arbitrary one of output of electric wire netting. The utility model discloses with alternating current charging and direct current charging compatibility together, guaranteed energy storage converter homoenergetic normal start under multiple operating mode effectively, improved energy storage converter's operational reliability.
Description
Technical Field
The utility model belongs to the technical field of the energy storage converter, specifically be relate to a precharge device for energy storage converter.
Background
After the twenty-first century, the world energy pattern has changed, and new energy technologies represented by wind power generation and photovoltaic power generation have been developed and utilized more and more widely. Meanwhile, in order to solve the problems of centralized power generation, long-distance transmission and remote load center of the traditional power system, the state vigorously develops a micro-grid technology which can be accessed to a distributed power supply and has a flexible operation mode. Due to the randomness of the output power of new energy power generation and the requirement of the self constitution of the micro-grid, the battery energy storage system increasingly highlights the important function, and can realize the functions of peak clipping and valley filling, system stability improvement, power fluctuation stabilization, electric energy quality improvement and the like. The energy storage bidirectional converter is a key device for realizing bidirectional energy transfer between the direct-current energy storage battery and a power grid, and the control performance of the energy storage bidirectional converter determines important indexes of the whole energy storage system, such as reliability, control precision, output electric energy quality and the like. As a key device in the energy storage system of the microgrid, the development of the energy storage converter is closely related to the development of the energy storage of the microgrid.
At present, in order to enable the energy storage converter to be started normally, the energy storage converter needs to be precharged, and the precharging mode generally adopts alternating current charging or direct current charging. Because the single of the way of precharging, the energy storage converter can not be used under various working conditions, greatly reduced the applicability of the energy storage converter, precharge time overlength in addition, precharge inefficiency.
Disclosure of Invention
The utility model discloses solve the technical problem that above-mentioned prior art exists, provide a precharge device for energy storage converter.
The above technical problem of the present invention can be solved by the following technical solutions: a pre-charging device for an energy storage converter comprises a direct-current side power supply, a direct-current side breaker Q8, a resistor R1, a resistor R2, a diode VD1, a rectifier bridge VD2, a power module, an alternating-current side main loop contactor KM1, an alternating-current side contactor KM3 and a power grid, wherein the direct-current side power supply is connected with the direct-current side of the power module through a direct-current side breaker Q8, the alternating-current side of the power module is connected with the power grid through an alternating-current side main loop contactor KM1, the output end of the rectifier bridge VD2 is connected with the direct-current side of the power module, the input end of the rectifier bridge VD2 is connected with any phase of the output end of the power grid through an alternating-current side contactor KM3, the positive electrode of the direct-current side of the power module is connected with the positive electrode of the diode VD1, the negative electrode of the diode VD1 is connected with the positive electrode of the direct-current side power supply, the negative electrode of the direct-current side power module is connected with one, the resistor R1 is provided on a line connecting the input end of the rectifier bridge VD2 and the ac-side contactor KM 3.
Preferably, the dc-side power supply is a battery.
Preferably, the power module comprises an AC/DC rectifying inverter.
The utility model discloses beneficial effect who has: the utility model discloses with alternating current charging and direct current charging compatibility together, guaranteed energy storage converter homoenergetic normal start under multiple operating mode effectively, improved energy storage converter's operational reliability. The utility model discloses in, can adopt alternating current charging and direct current to charge to the energy storage converter in advance simultaneously, shorten the time of charging in advance greatly, improve the pre-charge efficiency.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of the present invention.
In the figure: 1. a direct current side power supply; 2. a dc-side breaker Q8; 3. a power module; 4. an alternating current side main loop contactor KM 1; 5. an alternating-current-side contactor KM 3; 6. and (4) a power grid.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): a pre-charging device for an energy storage converter is shown in figure 1 and comprises a direct current side power supply, a direct current side breaker Q8, a resistor R1, a resistor R2, a diode VD1, a rectifier bridge VD2, a power module, an alternating current side main loop contactor KM1, an alternating current side contactor KM3 and a power grid, wherein the direct current side power supply is connected with the direct current side of the power module through a direct current side breaker Q8, the alternating current side of the power module is connected with the power grid through an alternating current side main loop contactor KM1, the output end of the rectifier bridge VD2 is connected with the direct current side of the power module, the input end of the rectifier bridge VD2 is connected with any phase of the output end of the power grid through an alternating current side contactor KM3, the positive electrode of the direct current side of the power module is connected with the positive electrode of the diode VD1, the negative electrode of the diode VD1 is connected with the positive electrode of the direct current side power supply, the negative electrode of the direct current side of the power module is connected with one end of the resistor R2, the other end, the resistor R1 is provided on a line connecting the input end of the rectifier bridge VD2 and the ac-side contactor KM 3.
The direct-current side power supply is a storage battery which can be a common energy storage battery such as a lead-acid battery and a lithium battery.
The power grid is three-phase alternating current.
The power module comprises an AC/DC rectification inverter, the AC/DC rectification inverter is converted into the prior art, and alternating current and direct current can be converted.
The utility model discloses with alternating current charging and direct current charging compatibility together, guaranteed energy storage converter homoenergetic normal start under multiple operating mode effectively, improved energy storage converter's operational reliability.
If the power module is under the off-grid working condition, when the power grid is not electrified or does not have the power grid running, the power module can be pre-charged by adopting a direct current side power supply, and the specific operation is as follows: the direct current side breaker Q8 is disconnected, and the storage battery pre-charges the power module through the resistor R2; when the power module reaches a pre-charging set value, the energy storage converter is normally started, the direct-current side circuit breaker Q8 is closed, the storage battery continuously supplies power to the power module, and the power module converts direct current into alternating current to be output.
If when being connected with the power grid, can adopt electric wire netting and direct current side power to carry out the precharge to power module simultaneously, specifically the operation does: the direct current side breaker Q8 is disconnected, the storage battery pre-charges the power module through the resistor R2, meanwhile, the alternating current side main circuit contactor KM1 is disconnected, the alternating current side contactor KM3 is closed, and one path of alternating current on a power grid is rectified into direct current through the rectifier bridge VD2 and then pre-charges the power module; when the power module reaches a pre-charging set value, the energy storage converter is normally started, the direct-current side breaker Q8 is closed, the alternating-current side main loop KM1 is closed, the alternating-current side contactor KM3 is disconnected, if the power module is in a charging working condition, the power module is continuously powered by a power grid, the power module converts alternating current into direct current to charge the storage battery, if the power module is in a discharging working condition, the storage battery continuously powers the power module, and the power module converts the direct current into the alternating current to be output to the power grid.
If the power supply is used as a power supply for supplying power to a direct current load, no direct current side power supply exists, and the power module can be precharged by adopting a power grid, and the specific operation is as follows: the alternating current side main loop contactor KM1 is disconnected, the alternating current side contactor KM3 is closed, and one path of alternating current on a power grid is rectified into direct current through a rectifier bridge VD2 and then the power module is precharged; when the power module reaches a pre-charging set value, the energy storage converter is normally started, the alternating current side main loop KM1 is closed, the alternating current side contactor KM3 is disconnected, the power grid continuously supplies power to the power module, and the power module converts alternating current into direct current to supply power to a direct current load.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should be considered as belonging to the protection scope of the present invention.
Claims (2)
1. A pre-charging device for an energy storage converter is characterized by comprising a direct-current side power supply, a direct-current side circuit breaker Q8, a resistor R1, a resistor R2, a diode VD1, a rectifier bridge VD2, a power module, an alternating-current side main loop contactor KM1, an alternating-current side contactor KM3 and an alternating-current power grid, wherein the direct-current side power supply is connected with the direct-current side of the power module through the direct-current side circuit breaker Q8, the alternating-current side of the power module is connected with the alternating-current power grid through an alternating-current side main loop contactor KM1, the output end of the rectifier bridge 63VD 62 is connected with the direct-current side of the power module, the input end of the rectifier bridge VD2 is connected with any phase of the output end of the alternating-current power grid through the alternating-current side contactor KM 25, the positive electrode of the direct-current side of the power module is connected with the positive electrode of a diode VD1, the negative electrode of the diode VD1 is connected with the positive electrode of the direct-current side power, the other end of the resistor R2 is connected with the negative electrode of the direct current side power supply, and the resistor R1 is arranged on a line connecting the input end of the rectifier bridge VD2 and the alternating current side contactor KM 3.
2. A pre-charging apparatus for a power converter as claimed in claim 1, wherein said dc side power source is a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920818863.8U CN209881476U (en) | 2019-05-31 | 2019-05-31 | Pre-charging device for energy storage converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920818863.8U CN209881476U (en) | 2019-05-31 | 2019-05-31 | Pre-charging device for energy storage converter |
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| CN209881476U true CN209881476U (en) | 2019-12-31 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489298A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Pre-charging circuit applied to alternating current-direct current bidirectional inverter power supply module |
| CN113949151A (en) * | 2021-10-19 | 2022-01-18 | 浙江德升新能源科技有限公司 | Black-start power supply circuit of energy storage converter |
| CN117154139A (en) * | 2023-10-27 | 2023-12-01 | 福建星云电子股份有限公司 | Flow battery activation device and method |
| CN117200568A (en) * | 2023-11-06 | 2023-12-08 | 广州奥鹏能源科技有限公司 | Bidirectional inverter soft start system for energy storage power supply and control method thereof |
-
2019
- 2019-05-31 CN CN201920818863.8U patent/CN209881476U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489298A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Pre-charging circuit applied to alternating current-direct current bidirectional inverter power supply module |
| CN113949151A (en) * | 2021-10-19 | 2022-01-18 | 浙江德升新能源科技有限公司 | Black-start power supply circuit of energy storage converter |
| CN117154139A (en) * | 2023-10-27 | 2023-12-01 | 福建星云电子股份有限公司 | Flow battery activation device and method |
| CN117154139B (en) * | 2023-10-27 | 2024-02-06 | 福建星云电子股份有限公司 | Flow battery activation device and method |
| CN117200568A (en) * | 2023-11-06 | 2023-12-08 | 广州奥鹏能源科技有限公司 | Bidirectional inverter soft start system for energy storage power supply and control method thereof |
| CN117200568B (en) * | 2023-11-06 | 2024-02-27 | 广州奥鹏能源科技有限公司 | Bidirectional inverter soft start system for energy storage power supply and control method thereof |
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