CN107872090B - Energy storage battery pre-charging circuit and pre-charging method - Google Patents
Energy storage battery pre-charging circuit and pre-charging method Download PDFInfo
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- CN107872090B CN107872090B CN201610854978.3A CN201610854978A CN107872090B CN 107872090 B CN107872090 B CN 107872090B CN 201610854978 A CN201610854978 A CN 201610854978A CN 107872090 B CN107872090 B CN 107872090B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 230000007717 exclusion Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- H02J7/045—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
The invention discloses an energy storage battery pre-charging circuit and a pre-charging method.A first current limiting element and a first pre-charging switch are connected in series and then bridged at two ends of an alternating current switch; one end of the alternating current switch is connected with an alternating current input power supply, the other end of the alternating current switch is connected with one end of the alternating current filter inductor, and the other end of the alternating current switch is connected with the alternating current filter capacitor through the interlocking switch; the other end of the alternating current filter inductor is connected with an alternating current end of the inversion module, and a direct current end of the inversion module is bridged at two ends of the direct current bus capacitor; the second current limiting element and the second pre-charging switch are connected in series and then bridged at two ends of the direct current switch; one end of the direct current switch is connected with one end of the direct current bus capacitor, and the other end of the direct current switch and the other end of the direct current bus capacitor are respectively used for connecting two ends of the energy storage battery; the first pre-charge switch and the interlock switch are in a mutually exclusive relationship. According to the technical scheme, the pre-charging of the energy storage battery and the direct-current capacitor of the converter is realized by matching two groups of pre-charging switches and the current-limiting resistor with the main loop of the converter.
Description
Technical Field
The invention belongs to the field of energy storage converters, and particularly relates to an energy storage battery pre-charging circuit and a pre-charging method.
Background
In the power-lack state of the energy storage battery, the direct-current voltage is very low, and even in some types of energy storage current, the direct-current voltage is zero. It needs to be pre-charged before use.
Meanwhile, a large-capacity supporting capacitor is generally configured on the direct-current side of the converter, an uncontrolled rectification loop can be formed by directly closing an alternating-current side loop through an inverter bridge of the converter, and due to the fact that impedance of the alternating-current side loop is small, if the direct-current capacitor is not charged, a large impact current can be formed, damage is caused to elements, and therefore the direct-current capacitor of the converter also needs to be precharged.
Disclosure of Invention
The invention aims to provide an energy storage battery pre-charging circuit and a pre-charging method, which can realize the pre-charging of an energy storage battery and a direct current capacitor of a converter by matching two groups of pre-charging switches and a current-limiting resistor with a main loop of the converter.
In order to achieve the above purpose, the solution of the invention is:
a pre-charging circuit of an energy storage battery comprises a first current limiting element, a first pre-charging switch, an interlocking switch, a second current limiting element, a second pre-charging switch and a converter main circuit, wherein the converter main circuit comprises an alternating current switch, an alternating current filter capacitor, an alternating current filter inductor, an inversion module, a direct current bus capacitor and a direct current switch, and the first current limiting element and the first pre-charging switch are connected in series and then bridged at two ends of the alternating current switch; one end of the alternating current switch is connected with an alternating current input power supply, the other end of the alternating current switch is connected with one end of the alternating current filter inductor, and the other end of the alternating current switch is also connected with the alternating current filter capacitor through the interlocking switch; the other end of the alternating current filter inductor is connected with an alternating current end of the inversion module, and a direct current end of the inversion module is bridged at two ends of the direct current bus capacitor; the second current limiting element and the second pre-charging switch are connected in series and then bridged at two ends of the direct current switch; one end of the direct current switch is connected with one end of the direct current bus capacitor, and the other end of the direct current switch and the other end of the direct current bus capacitor are respectively used for connecting two ends of the energy storage battery; and the first pre-charging switch and the interlocking switch are in a mutual exclusion relationship.
The first current limiting element at least comprises a resistor, the second current limiting element at least comprises a resistor, and the resistance value of the first current limiting element is not less than that of the second current limiting element.
A pre-charging method based on the pre-charging circuit of the energy storage battery comprises the following steps:
(1) disconnecting the second pre-charging switch, the direct current switch, the alternating current switch and the interlocking switch, closing the first pre-charging switch, and pre-charging the direct current bus capacitor after the current transformer is subjected to uncontrolled rectification through the first current limiting element and the first pre-charging switch;
(2) after the direct current bus capacitor is charged to the uncontrolled rectification voltage of the converter, the alternating current switch is closed, the first pre-charging switch is disconnected, and the interlocking switch is closed, so that the alternating current filter capacitor is connected into the filter circuit again;
(3) closing a second pre-charging switch, and charging the energy storage battery after the current is limited by a second current limiting element through an uncontrolled current of the converter;
(4) when the voltage difference value of the two ends of the direct current switch is smaller than the threshold voltage, the direct current switch is closed, the second pre-charging switch is disconnected, and at the moment, the converter main circuit between the energy storage battery and the power grid is completely communicated;
(5) and starting the converter to enable the converter to work in a constant current, constant power or constant voltage mode, and continuously completing the charging of the energy storage battery.
The first pre-charging switch and the interlocking switch are mutually exclusive, and the switching of the first pre-charging switch and the interlocking switch is completed by a manual or interlocking mechanism or a controller and a control loop.
In the step (4), the threshold voltage is set to be not greater than 40% of the rated value of the dc voltage.
After the scheme is adopted, the invention has the following beneficial effects:
1) according to the scheme of the invention, the pre-charging on the direct current side is realized through the pre-charging switch, the current limiting element and the uncontrolled rectifying circuit of the parasitic diode of the converter, an additional rectifying bridge is not needed, and the main circuit of the converter is fully utilized by the charging loop, so that larger pre-charging power can be achieved;
2) the power generation realizes the pre-charging of the direct current bus capacitor and the energy storage battery in steps through two groups of pre-charging switches and current limiting elements;
3) the scheme of the invention controls the input and the exit of the alternating current filter capacitor loop through the interlocking switch, disconnects the filter capacitor during the pre-charging, eliminates the influence of the filter capacitor on the pre-charging, and simplifies the whole pre-charging circuit into a simple uncontrolled rectifying and current-limiting circuit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram illustrating the DC capacitor pre-charging according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention during pre-charging of an energy storage battery;
fig. 4 is a schematic diagram of the embodiment of the invention when the main circuit of the converter is closed.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an energy storage battery pre-charging circuit, which includes a current limiting element 1, a pre-charging switch 2, an interlock switch 3, a current limiting element 4, a pre-charging switch 5, and a converter main circuit 6 connected thereto, where the converter main circuit 6 mainly includes an ac switch 21, an ac filter capacitor, an ac filter inductor, an inverter module, a dc bus capacitor, and a dc switch 62, which are respectively described below.
The current limiting element 1 and the pre-charging switch 2 are connected in series and then are bridged at two ends of the alternating current switch 61; one end of the alternating current switch 61 is connected with an alternating current input power supply, the other end of the alternating current switch is connected with an alternating current output end of a bridge arm of the converter, specifically, one end of the alternating current filter inductor is connected, and the other end of the alternating current switch 61 is also connected with an alternating current filter capacitor through the interlocking switch 3.
The other end of the alternating current filter inductor is connected with an alternating current end of the inversion module, and a direct current end of the inversion module is in bridge connection with two ends of the direct current bus capacitor.
The current limiting element 4 and the pre-charging switch 5 are connected in series and then are connected across two ends of the direct current switch 62; one end of the direct current switch 62 is connected with one end of the direct current bus capacitor, and the other end of the direct current switch 62 and the other end of the direct current bus capacitor are respectively used for connecting two ends of the energy storage battery.
Wherein, precharge switch 2 and interlock switch 3 are the mutual exclusion relation, also promptly: when the pre-charging switch 2 is closed, the interlock switch 3 is switched off; when the precharge switch 2 is opened, the interlock switch 3 is closed. The separation and combination of the two can be completed by manual or interlocking mechanism, and also can be completed by a controller and a control loop, and the two can not be in a closed state at the same time in the operation process.
The current limiting element 1 at least comprises a resistor, the current limiting element 4 at least comprises a resistor, and the resistance value of the current limiting element 1 is not less than that of the current limiting element 4.
The invention also provides an energy storage battery pre-charging method based on the pre-charging circuit, which is shown by matching with the figures 2 to 4 and takes a three-phase two-level converter as an example, of course, the pre-charging circuit and the pre-charging method of the invention are not limited to the three-phase two-level converter, and a single-phase or multi-level converter is also applicable; the pre-charging method comprises the following steps:
(1) firstly, a direct current bus capacitor is precharged through a current limiting element 1 and a precharge switch 2, as shown in fig. 2, specifically, a precharge switch 5, a direct current switch 62, an alternating current switch 61 and an interlocking switch 3 are disconnected, the precharge switch 2 is closed, the alternating current filter inductor of a converter is connected to an alternating current end of an inverter module, and direct current is formed to precharge the direct current bus capacitor after being rectified by an uncontrolled rectifying circuit parasitic on the inverter module;
(2) after the direct current bus capacitor is charged to the uncontrolled rectification voltage of the converter, the alternating current switch 61 is closed, the pre-charging switch 2 is disconnected, and the interlocking switch 3 is closed, so that the alternating current filter capacitor is connected into the filter loop again;
(3) as shown in fig. 3, the pre-charging switch 5 is closed, and the current is limited by the current limiting element 4 through the uncontrolled rectification of the converter, and then the energy storage battery is charged;
(4) when the voltage difference value at the two ends of the direct current switch 62 is smaller than the threshold voltage, the direct current switch 62 is closed, the pre-charging switch 5 is disconnected, and as shown in fig. 4, the converter main circuit between the energy storage battery and the power grid is completely communicated; wherein the threshold voltage is set to be not greater than 40% of the DC voltage rating;
(5) and starting the converter to enable the converter to work in a constant current, constant power or constant voltage mode, and continuously completing the charging of the energy storage battery.
In summary, the present invention provides a pre-charging circuit and a pre-charging method for an energy storage battery, wherein an ac side power supply is used to pre-charge a dc bus capacitor and the energy storage battery in steps by combining two sets of pre-charging switches and a current limiting element through an uncontrolled rectification function of a parasitic diode of an inverter bridge in a converter; and then the converter is controlled to start to operate, so that the battery is further charged, and the voltage of the battery is stabilized. The current limiting element and the pre-charging switch are used for limiting pre-charging current and controlling the switching of a pre-charging loop; the interlocking switch and the alternating current pre-charging switch which are used cooperatively are mutually exclusive. The invention sets AC and DC two-stage current limiting, realizes the pre-charging of the DC capacitor and the energy storage battery by steps, has simple scheme and is easy to realize.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (4)
1. A pre-charging method of a pre-charging circuit of an energy storage battery is characterized in that:
the energy storage battery pre-charging circuit comprises a first current limiting element, a first pre-charging switch, an interlocking switch, a second current limiting element, a second pre-charging switch and a converter main circuit, wherein the converter main circuit comprises an alternating current switch, an alternating current filter capacitor, an alternating current filter inductor, an inversion module, a direct current bus capacitor and a direct current switch, and the first current limiting element and the first pre-charging switch are connected in series and then bridged at two ends of the alternating current switch; one end of the alternating current switch is connected with an alternating current input power supply, the other end of the alternating current switch is connected with one end of the alternating current filter inductor, and the other end of the alternating current switch is also connected with the alternating current filter capacitor through the interlocking switch; the other end of the alternating current filter inductor is connected with an alternating current end of the inversion module, and a direct current end of the inversion module is bridged at two ends of the direct current bus capacitor; the second current limiting element and the second pre-charging switch are connected in series and then bridged at two ends of the direct current switch; one end of the direct current switch is connected with one end of the direct current bus capacitor, and the other end of the direct current switch and the other end of the direct current bus capacitor are respectively used for connecting two ends of the energy storage battery; the first pre-charging switch and the interlocking switch are in a mutual exclusion relationship;
the pre-charging method comprises the following steps:
(1) disconnecting the second pre-charging switch, the direct current switch, the alternating current switch and the interlocking switch, closing the first pre-charging switch, and pre-charging the direct current bus capacitor after the current transformer is subjected to uncontrolled rectification through the first current limiting element and the first pre-charging switch;
(2) after the direct current bus capacitor is charged to the uncontrolled rectification voltage of the converter, the alternating current switch is closed, the first pre-charging switch is disconnected, and the interlocking switch is closed, so that the alternating current filter capacitor is connected into the filter circuit again;
(3) closing a second pre-charging switch, and charging the energy storage battery after the current is limited by a second current limiting element through an uncontrolled current of the converter;
(4) when the voltage difference value of the two ends of the direct current switch is smaller than the threshold voltage, the direct current switch is closed, the second pre-charging switch is disconnected, and at the moment, the converter main circuit between the energy storage battery and the power grid is completely communicated;
(5) and starting the converter to enable the converter to work in a constant current, constant power or constant voltage mode, and continuously completing the charging of the energy storage battery.
2. A method of precharging an energy storage battery precharging circuit as claimed in claim 1, wherein: the first current limiting element at least comprises a resistor, the second current limiting element at least comprises a resistor, and the resistance value of the first current limiting element is not less than that of the second current limiting element.
3. A method of precharging an energy storage battery precharging circuit as claimed in claim 1, wherein: the first pre-charging switch and the interlocking switch are mutually exclusive, and the switching on and off of the first pre-charging switch and the interlocking switch is completed by a manual or interlocking mechanism or a controller and a control loop.
4. A method of precharging an energy storage battery precharging circuit as claimed in claim 1, wherein: in the step (4), the threshold voltage is set to be not greater than 40% of the rated value of the dc voltage.
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| CN201610854978.3A CN107872090B (en) | 2016-09-27 | 2016-09-27 | Energy storage battery pre-charging circuit and pre-charging method |
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| CN109067160B (en) * | 2018-08-07 | 2020-11-13 | 浙江大学 | Starting method of soft switching converter with network side pre-charging function |
| CN112398183B (en) * | 2019-08-15 | 2023-04-07 | 比亚迪股份有限公司 | Pre-charging circuit, energy conversion device and vehicle |
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | For promoting charging circuit, control method and the PV air-conditioner equipment of reliability |
| CN112039179B (en) * | 2020-11-05 | 2021-04-20 | 武汉格罗夫氢能汽车有限公司 | Super capacitor bidirectional pre-charging system for fuel cell hydrogen energy automobile |
| CN116742679A (en) * | 2023-08-10 | 2023-09-12 | 上海百竹成航新能源有限责任公司 | Reverse starting energy storage system and reverse starting method |
| CN116995714B (en) * | 2023-09-28 | 2023-12-19 | 中宏科创新能源科技(浙江)有限公司 | Energy storage converter and control method thereof |
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| CN105620295A (en) * | 2016-01-28 | 2016-06-01 | 北京北交思远科技发展有限公司 | Vehicle-mounted energy storage device for subway trains and control method of vehicle-mounted energy storage device |
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| CN203166759U (en) * | 2013-04-03 | 2013-08-28 | 深圳市汇川技术股份有限公司 | A soft starting circuit of a converter power loop circuit |
| US9726725B2 (en) * | 2013-08-02 | 2017-08-08 | Jtekt Corporation | Power circuit abnormality detection method |
| CN104802655B (en) * | 2014-01-24 | 2017-03-29 | 联合汽车电子有限公司 | Electric drive system for electric vehicles HVDC end open circuit diagnostic system |
| KR20150096919A (en) * | 2014-02-17 | 2015-08-26 | 현대자동차주식회사 | Electric automobile |
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| CN105620295A (en) * | 2016-01-28 | 2016-06-01 | 北京北交思远科技发展有限公司 | Vehicle-mounted energy storage device for subway trains and control method of vehicle-mounted energy storage device |
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Effective date of registration: 20220714 Address after: 211102, No. 69, Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Patentee after: NR ELECTRIC Co.,Ltd. Patentee after: NR ENGINEERING Co.,Ltd. Patentee after: NR ELECTRIC POWER ELECTRONICS Co.,Ltd. Address before: 211102, No. 69, Su Yuan Avenue, Jiangning District, Jiangsu, Nanjing Patentee before: NR ELECTRIC Co.,Ltd. Patentee before: NR ENGINEERING Co.,Ltd. |
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