CN107872090A - A kind of energy-storage battery pre-charge circuit and pre-charge method - Google Patents
A kind of energy-storage battery pre-charge circuit and pre-charge method Download PDFInfo
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- CN107872090A CN107872090A CN201610854978.3A CN201610854978A CN107872090A CN 107872090 A CN107872090 A CN 107872090A CN 201610854978 A CN201610854978 A CN 201610854978A CN 107872090 A CN107872090 A CN 107872090A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- H02J7/045—
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of energy-storage battery pre-charge circuit and pre-charge method, after the first current limiting element and the first precharge switch are serially connected, is connected across the both ends of alternating-current switch；One end connection alternating current input power supplying of alternating-current switch, the other end connect one end of ac filter inductance, and the other end of alternating-current switch connects ac filter electric capacity via interlocking switch；The exchange end of the other end connection inversion module of ac filter inductance, the DC terminal of inversion module are connected across the both ends of dc-link capacitance；After second current limiting element and the second precharge switch are serially connected, the both ends of dc switch are connected across；One end of one end connection dc-link capacitance of dc switch, the other end of dc switch and the other end of dc-link capacitance are respectively used to connect the both ends of energy-storage battery；First precharge switch and interlocking switch are mutex relation.Such a technical scheme coordinates current transformer major loop by two groups of precharge switch and current-limiting resistance, realizes the precharge of energy-storage battery and current transformer DC capacitor.
Description
Technical field
The invention belongs to energy accumulation current converter field, more particularly to a kind of energy-storage battery pre-charge circuit and pre-charge method.
Background technology
Under energy-storage battery power shortage state, DC voltage is very low, or even DC voltage occurs in the energy storage electric current of some types
The situation for being zero.Therefore need entering line precharge to it using preceding.
Meanwhile the DC side of current transformer typically configures the Support Capacitor of larger capacity, directly closure exchange side loop can lead to
The inverter bridge for crossing current transformer forms uncontrollable rectifier loop, due to exchanging the impedance very little of side loop, if the uncharged meeting of DC capacitor
Larger dash current is formed, element is damaged, therefore is also required to enter line precharge to current transformer DC capacitor.
The content of the invention
The purpose of the present invention, it is to provide a kind of energy-storage battery pre-charge circuit and pre-charge method, it can pass through two groups
Precharge switch and current-limiting resistance coordinate current transformer major loop, realize the precharge of energy-storage battery and current transformer DC capacitor.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of energy-storage battery pre-charge circuit, including the first current limiting element, the first precharge switch, interlocking switch, second
Current limiting element, the second precharge switch, and main circuit of converter, the main circuit of converter include alternating-current switch, exchange filter
Ripple electric capacity, ac filter inductance, inversion module, dc-link capacitance and dc switch, wherein, the first current limiting element and first pre-
After charge switch is serially connected, the both ends of alternating-current switch are connected across；One end connection alternating current input power supplying of the alternating-current switch, separately
One end connects one end of ac filter inductance, and the other end of alternating-current switch also connects ac filter electric capacity via interlocking switch；Institute
The exchange end of the other end connection inversion module of ac filter inductance is stated, the DC terminal of inversion module is connected across dc-link capacitance
Both ends；After second current limiting element and the second precharge switch are serially connected, the both ends of dc switch are connected across；The direct current is opened
One end of one end connection dc-link capacitance of pass, the other end of dc switch and the other end of dc-link capacitance are respectively used to
Connect the both ends of energy-storage battery；And first precharge switch and interlocking switch are mutex relation.
Above-mentioned first current limiting element comprises at least a resistance, and the second current limiting element comprises at least a resistance, and first
The resistance of current limiting element is not less than the resistance of the second current limiting element.
A kind of pre-charge method based on foregoing energy-storage battery pre-charge circuit, comprises the following steps：
(1) the second precharge switch, dc switch, alternating-current switch and interlocking switch are disconnected, closes the first precharge switch,
By the first current limiting element, the first precharge switch, it is pre-charged after current transformer uncontrollable rectifier for dc-link capacitance；
(2) after dc-link capacitance charges to current transformer uncontrollable rectifier voltage, alternating-current switch is closed, disconnects the first precharge
Switch, interlocking switch is closed, ac filter electric capacity is accessed filter circuit again；
(3) close the second precharge switch, by current transformer uncontrollable rectifier after the second current limiting element current limliting for energy storage electricity
Charge in pond；
(4) when dc switch both end voltage difference is less than threshold voltage, dc switch is closed, the second preliminary filling is disconnected and establishes by cable
Close, now the main circuit of converter between energy-storage battery and power network all connects；
(5) starting current transformer makes current transformer be operated in constant current, invariable power or constant voltage mode, continues to complete to energy-storage battery
Charging.
Above-mentioned first precharge switch and interlocking switch are mutex relation, and the division of the two is complete by artificial or interlocking mechanism
Into, or by controller and control loop completion.
In above-mentioned steps (4), threshold voltage is set as 40% no more than DC voltage rated value.
After such scheme, the invention has the advantages that：
1) the present invention program is real by the uncontrollable rectifier circuit of precharge switch, current limiting element and current transformer parasitic diode
Now to the precharge of DC side, it is not necessary to extra rectifier bridge, and charge circuit makes full use of the main circuit of current transformer, Ke Yida
To larger precharge power；
2) this generating passes through two groups of precharge switch and current limiting element, realizes dc-link capacitance and energy-storage battery step by step
Precharge；
3) the present invention program controls the input of ac filter capacitor loop by interlocking switch and exited, and breaks in precharge
Open filter capacitor, exclude influence of the filter capacitor to precharge, make whole pre-charge circuit be reduced to simple uncontrollable rectifier and
Current-limiting circuit.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is schematic diagram of the embodiment of the present invention when DC capacitor is pre-charged；
Fig. 3 is schematic diagram of the embodiment of the present invention when energy-storage battery is pre-charged；
Fig. 4 is schematic diagram of the embodiment of the present invention when main circuit of converter closes.
Embodiment
Below with reference to accompanying drawing, technical scheme and beneficial effect are described in detail.
As shown in figure 1, the present invention provides a kind of energy-storage battery pre-charge circuit, including current limiting element 1, precharge switch 2,
Interlocking switch 3, current limiting element 4, precharge switch 5, and the main circuit of converter 6 being attached thereto, the main circuit of converter 6
Mainly include alternating-current switch 21, ac filter electric capacity, ac filter inductance, inversion module, dc-link capacitance and dc switch
62, introduce separately below.
After current limiting element 1 and precharge switch 2 are serially connected, the both ends of alternating-current switch 61 are connected across；The alternating-current switch
61 one end connection alternating current input power supplying, other end connection current transformer bridge arm ac output end, specifically connects ac filter electricity
One end of sense, the other end of alternating-current switch 61 also connect ac filter electric capacity via interlocking switch 3.
The exchange end of the other end connection inversion module of the ac filter inductance, the DC terminal of inversion module are connected across directly
Flow the both ends of bus capacitor.
After current limiting element 4 and precharge switch 5 are serially connected, the both ends of dc switch 62 are connected across；The dc switch
One end of 62 one end connection dc-link capacitance, the other end of dc switch 62 and the other end of dc-link capacitance are used respectively
In the both ends of connection energy-storage battery.
Wherein, precharge switch 2 and interlocking switch 3 are mutex relation, namely：When precharge switch 2 closes, interlocking is opened
3 are closed to disconnect；When precharge switch 2 disconnects, interlocking switch 3 closes.The division of the two can be completed by artificial or interlocking mechanism,
It can be completed by controller and control loop, must ensure that the two is not simultaneously in closure state in operating process.
Wherein, current limiting element 1 comprises at least a resistance, and current limiting element 4 comprises at least a resistance, and current limiting element 1
Resistance be not less than current limiting element 4 resistance.
The present invention also provides a kind of energy-storage battery pre-charge method based on foregoing pre-charge circuit, coordinates Fig. 2 to Fig. 4 institutes
Show, using the level current transformer of three-phase two to exemplify, certain pre-charge circuit and pre-charge method of the present invention are not limited to the electricity of three-phase two
Flat current transformer, single-phase or Multilevel Inverters are equally applicable；The pre-charge method comprises the following steps：
(1) it is pre-charged first by current limiting element 1, precharge switch 2 for dc-link capacitance, as shown in Fig. 2 being specifically
Precharge switch 5, dc switch 62, alternating-current switch 61 and interlocking switch 3 are disconnected, closes precharge switch 2, the friendship through current transformer
The exchange end of filter inductance access inversion module is flowed, after the parasitic uncontrollable rectifier circuit rectifies of inversion module itself, is formed straight
Stream electricity is pre-charged for dc-link capacitance；
(2) after dc-link capacitance charges to current transformer uncontrollable rectifier voltage, alternating-current switch 61 is closed, preliminary filling is disconnected and establishes by cable
2 are closed, interlocking switch 3 is closed, ac filter electric capacity is accessed filter circuit again；
(3) as shown in figure 3, closure precharge switch 5, by current transformer uncontrollable rectifier after the current limliting of current limiting element 4 for storage
Can battery charging；
(4) when the both end voltage difference of dc switch 62 is less than threshold voltage, dc switch 62 is closed, disconnects precharge switch
5, coordinate shown in Fig. 4, now the main circuit of converter between energy-storage battery and power network all connects；Wherein, threshold voltage is set
For 40% no more than DC voltage rated value；
(5) starting current transformer makes current transformer be operated in constant current, invariable power or constant voltage mode, continues to complete to energy-storage battery
Charging.
Summary, the present invention provide a kind of energy-storage battery pre-charge circuit and pre-charge method, utilize AC power supply
Acted on by the uncontrollable rectifier of the parasitic diode of inverter bridge in current transformer, with reference to two groups of precharge switch and current limiting element, divided
Step is pre-charged to dc-link capacitance and energy-storage battery；Then current transformer startup optimization is controlled, is further charged the battery, surely
Determine cell voltage.Current limiting element, precharge switch in the present invention are used to limit pre-charge current and control preliminary filling electrical circuit
Throwing is moved back；The interlocking switch being used cooperatively is with exchanging precharge switch mutual exclusion.The present invention sets AC and DC two level current limiting, substep
Suddenly the precharge to DC capacitor and energy-storage battery is realized, scheme is simple, easily realizes.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (5)
- A kind of 1. energy-storage battery pre-charge circuit, it is characterised in that：Including the first current limiting element, the first precharge switch, interlocking Switch, the second current limiting element, the second precharge switch, and main circuit of converter, the main circuit of converter are opened including exchange Pass, ac filter electric capacity, ac filter inductance, inversion module, dc-link capacitance and dc switch, wherein, the first current limliting member After part and the first precharge switch are serially connected, the both ends of alternating-current switch are connected across；One end connection exchange of the alternating-current switch Input power, the other end connect one end of ac filter inductance, and the other end of alternating-current switch also connects via interlocking switch to be exchanged Filter capacitor；The exchange end of the other end connection inversion module of the ac filter inductance, the DC terminal of inversion module are connected across The both ends of dc-link capacitance；After second current limiting element and the second precharge switch are serially connected, the two of dc switch is connected across End；One end of one end connection dc-link capacitance of the dc switch, the other end of dc switch and dc-link capacitance The other end is respectively used to connect the both ends of energy-storage battery；And first precharge switch and interlocking switch are mutex relation.
- A kind of 2. energy-storage battery pre-charge circuit as claimed in claim 1, it is characterised in that：First current limiting element is at least Comprising a resistance, the second current limiting element comprises at least a resistance, and the resistance of the first current limiting element is not less than the second current limliting The resistance of element.
- 3. based on a kind of pre-charge method of energy-storage battery pre-charge circuit as claimed in claim 1, it is characterised in that including Following steps：(1) the second precharge switch, dc switch, alternating-current switch and interlocking switch are disconnected, the first precharge switch is closed, passes through First current limiting element, the first precharge switch, it is pre-charged after current transformer uncontrollable rectifier for dc-link capacitance；(2) after dc-link capacitance charges to current transformer uncontrollable rectifier voltage, alternating-current switch is closed, the first preliminary filling is disconnected and establishes by cable Close, close interlocking switch, ac filter electric capacity is accessed filter circuit again；(3) the second precharge switch is closed, is filled by current transformer uncontrollable rectifier after the second current limiting element current limliting for energy-storage battery Electricity；(4) when dc switch both end voltage difference is less than threshold voltage, dc switch is closed, disconnects the second precharge switch, this When energy-storage battery and power network between main circuit of converter all connect；(5) starting current transformer makes current transformer be operated in constant current, invariable power or constant voltage mode, continues to complete and energy-storage battery is filled Electricity.
- A kind of 4. energy-storage battery pre-charge method as claimed in claim 3, it is characterised in that：First precharge switch with Interlocking switch is mutex relation, and the division of the two is completed by artificial or interlocking mechanism, or is completed by controller and control loop.
- A kind of 5. energy-storage battery pre-charge method as claimed in claim 3, it is characterised in that：In the step (4), threshold electricity Pressure is set as 40% no more than DC voltage rated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610854978.3A CN107872090B (en) | 2016-09-27 | 2016-09-27 | Energy storage battery pre-charging circuit and pre-charging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610854978.3A CN107872090B (en) | 2016-09-27 | 2016-09-27 | Energy storage battery pre-charging circuit and pre-charging method |
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| Publication Number | Publication Date |
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| CN107872090A true CN107872090A (en) | 2018-04-03 |
| CN107872090B CN107872090B (en) | 2021-03-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067160A (en) * | 2018-08-07 | 2018-12-21 | 浙江大学 | A kind of starting method of the soft-switching converter of net side precharge |
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
| CN112039179A (en) * | 2020-11-05 | 2020-12-04 | 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 |
| CN112398183A (en) * | 2019-08-15 | 2021-02-23 | 比亚迪股份有限公司 | Pre-charging circuit, energy conversion device and vehicle |
| 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 |
| CN116995714A (en) * | 2023-09-28 | 2023-11-03 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067160A (en) * | 2018-08-07 | 2018-12-21 | 浙江大学 | A kind of starting method of the soft-switching converter of net side precharge |
| CN112398183A (en) * | 2019-08-15 | 2021-02-23 | 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 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
| CN112039179A (en) * | 2020-11-05 | 2020-12-04 | 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 |
| 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 |
| CN116995714A (en) * | 2023-09-28 | 2023-11-03 | 中宏科创新能源科技(浙江)有限公司 | Energy storage converter and control method thereof |
| 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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| CN107872090B (en) | 2021-03-30 |
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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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