CN102969917A - Two-way buck-boost direct current (DC) converter applied to energy storage system - Google Patents
Two-way buck-boost direct current (DC) converter applied to energy storage system Download PDFInfo
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- CN102969917A CN102969917A CN2012104190472A CN201210419047A CN102969917A CN 102969917 A CN102969917 A CN 102969917A CN 2012104190472 A CN2012104190472 A CN 2012104190472A CN 201210419047 A CN201210419047 A CN 201210419047A CN 102969917 A CN102969917 A CN 102969917A
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Abstract
The invention relates to a two-way buck-boost DC converter applied to an energy storage system. The DC converter is characterized by being included in the energy storage system and comprising an input capacitor Ci, a filter inductor Lm, a transistor S1, a transistor S2 and an output capacitor C0, wherein the battery positive pole of the energy storage system is connected with the positive pole of the input capacitor Ci and one end of the filter inductor Lm, the other end of the filter inductor Lm is connected with the common point of the drain of the transistor S1 and the source of the transistor S2, the drain of the transistor S2 is connected with the positive pole of the output capacitor C0 and the input side positive pole of an energy storage grid-connected inverter, and the input side negative pole of the energy storage grid-connected inverter is connected with the negative pole of the output capacitor C0, the source of the transistor S1, the negative pole of the input capacitor Ci and the battery negative pole. The two-way buck-boost DC converter is provided with a power two-way function and a plurality of DC converters with the same model are connected in series for use during high capacity to satisfy the requirement of various grid systems for the power.
Description
Technical field
The present invention relates to the electric device of energy-storage system, be specifically related to a kind of Bidirectional up-down straightening current converter that is applied to energy-storage system.
Background technology
Energy-storage system is being brought into play positive effect as a kind of important distributed power source at aspects such as electrical network peak load shifting, new forms of energy access, quality of power supply improvement and emergency power supplies.Current transformer is realized the bidirectional energy transmission between energy-storage battery system and the rear class inverter, and dc-battery is boosted, for the rear class inverter provides an input voltage that can work, stable.
Owing to the restriction of battery cell group technology, cell is connection in series-parallel unrestrictedly at present, and the voltage of battery pack, capacity are limited.When being used in the voltage that needs in the network system battery pack, energy-storage battery suitably raises, to adapt to the inverter normal working voltage scope of rear class.Equally, because the restriction of battery capacity, in large-power occasions, can be with the use in parallel of many DC converter, every DC converter connects a battery rack, and the output with DC converter is parallel on the dc bus of inverter input, to satisfy the demand of various operating modes together again, so current transformer is indispensable part in the energy-storage system.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of Bidirectional up-down straightening current converter that is applied to energy-storage system, the present invention is elevated to the voltage range that the rear class inverter can work with the output voltage of the battery of the different electric pressures of variety classes.In order to cooperate the energy storage combining inverter, this converter has the power bi-directional function, when large capacity, with the use in parallel of the converter of many same models, to satisfy various network systems to the demand of power.
The objective of the invention is to adopt following technical proposals to realize:
A kind of Bidirectional up-down straightening current converter that is applied to energy-storage system, its improvements are that described Bidirectional up-down straightening current converter is included in the energy-storage system, and described Bidirectional up-down straightening current converter comprises input capacitance C
i, filter inductance L
m, transistor S
1, transistor S
2With output capacitance C
0The anode of energy-storage system connects input capacitance C
iPositive pole and filter inductance L
mOne end; Described filter inductance L
mThe other end connects transistor S
1Drain electrode and transistor S
2The common point of source electrode; Described transistor S
2Drain electrode connects output capacitance C
0Positive pole and the input side of energy storage combining inverter anodal; Described energy storage combining inverter input side negative pole connects output capacitance C
0Negative pole, transistor S
1Source electrode, input capacitance C
iNegative pole and battery cathode.
Wherein, described transistor S
1With transistor S
2Be the insulated gate bipolar transistor IGBT switching tube; Described IGBT switching tube is comprised of antiparallel diode and triode.
Wherein, described input capacitance C
iThe current ripples that is used for the output of filtering battery or input.
Wherein, described filter inductance L
mIn a switch periods, according to the on off state of IGBT switching tube, discharge electric energy after the first store electrical energy.
Wherein, when described bidirectional Buck-Boost converter is operated in the boost mode, described transistor S
1As switching tube, described transistor S
2Diode as fly-wheel diode; When described bidirectional Buck-Boost converter is operated in the decompression mode, described transistor S
1Diode as fly-wheel diode, described transistor S
2As switching tube.
Wherein, described boost mode is battery charging mode according to user; Described decompression mode is the battery discharge pattern.
Wherein, described output capacitance C
0Be used for the output of filtering inverter or input or current ripples.
Wherein, described energy-storage system comprises battery pack, at least two DC converter, energy storage combining inverter and electrical networks; Described battery pack is comprised of the battery of at least one; Described battery storing is in battery rack; Be connected with the energy storage combining inverter after DC converter of each battery series connection; In the described energy storage combining inverter access electrical network; At least two DC converter parallel connections.
Wherein, described DC converter or be Bidirectional up-down straightening current converter.
Wherein, the electric pressure of described battery pack input is between 300V～800V; The battery of described battery pack adopts lead-acid battery, all-vanadium flow battery, sodium-sulphur battery, lithium battery, fuel cell or super capacitor.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, the Bidirectional up-down straightening current converter that is applied to energy-storage system provided by the invention, wide-range input voltage is applicable to different electric pressures between 300V～800V, the battery rack of different size.
2, the function that has energy in bidirectional flow.
3, in large-power occasions, can be with the use in parallel of many DC converter, to satisfy the demand of various operating modes.
4, applied widely: as can be widely used in photovoltaic market, extensive energy-storage system, microgrid and rural power grids, areas without electricity etc.
5, by increasing DC converter, can improve flexibility, the reliability and maintainability of whole system, reduce inverter system to the electric requirement of input distributed power source.
6, circuit topology adopts Interleaving and Transformer Paralleling, and in the battery side parallel connection a large electric capacity, therefore greatly reduced the battery current ripple, having reduced in charge and discharge process has increased the life-span of battery to a certain extent to the impact of battery.
7, battery can be various types of other batteries such as plumbic acid, all-vanadium flow, sodium-sulphur battery, lithium battery, can also replace applying flexible with fuel cell and super capacitor simultaneously.
Description of drawings
Fig. 1 is energy-storage battery schematic diagram provided by the invention;
Fig. 2 is the Bidirectional up-down straightening current converter circuit topology figure that is applied to energy-storage system provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Energy-storage battery schematic diagram provided by the invention as shown in Figure 1, energy-storage system comprises battery pack, DC converter, energy storage combining inverter and electrical network; Described battery pack is comprised of the battery of at least one; Battery storing is in battery rack; With the use in parallel of many DC converter, every DC converter connects a battery rack, and the output with DC converter is parallel on the dc bus of energy storage combining inverter input together again; In the described energy storage combining inverter access electrical network.
The Bidirectional up-down straightening current converter circuit topology that is applied to energy-storage system provided by the invention as shown in Figure 2, Bidirectional up-down straightening current converter is included in the energy-storage system, described Bidirectional up-down straightening current converter comprises input capacitance C
i, filter inductance L
m, lower pipe S
1Insulated gate bipolar transistor (Insulated Gate Bipolar Transistor is called for short IGBT), upper pipe S
2Insulated gate bipolar transistor and output capacitance C
0Described anode connects input capacitance C
iPositive pole and filter inductance L
mOne end; Described filter inductance L
mThe other end connects lower pipe S
1Drain electrode and upper pipe S
2The common point of source electrode; Described upper pipe S
2Drain electrode connects output capacitance C
0Positive pole and the input side of energy storage combining inverter anodal; Energy storage combining inverter input side negative pole connects output capacitance C
0Negative pole, upper pipe S
1Source electrode, input capacitance C
iNegative pole and battery cathode.
Input capacitance C
i: filter action guarantees that the current ripples of battery output (input) meets the demands.Filter inductance L
m: in a switch periods, according to the on off state of IGBT switching tube, discharge electric energy after the first store electrical energy.Switching tube S
1And S
2: in boost mode, lower pipe S
1As switching tube, upper pipe S
2Body diode as fly-wheel diode.In decompression mode, lower pipe S
1As fly-wheel diode, upper pipe S
2Body diode as switching tube.Output capacitance C
O: filter action guarantees that the current ripples of inverter output (input) meets the demands.
When converter is operated under the boost mode, lower pipe S
1Insulated gate bipolar transistor (Insulated Gate Bipolar Transistor is called for short IGBT) is as the switching tube of booster circuit topological mode, pipe S in the utilization
2Body diode as the fly-wheel diode of booster circuit topological mode.Circuit-mode is lifted to voltage the voltage range that the inverter of rear class can work when battery discharge; Otherwise, under the mode of operation of battery charging, reverse direction current flow, this moment, circuit topology became BUCK reduction voltage circuit pattern, upper pipe S
2As switching tube, lower pipe S
1Body diode as the fly-wheel diode of BUCK reduction voltage circuit pattern, circuit is taked two-way Bidirectional variable-flow topology pattern in parallel, reducing the input and output current ripples, thereby reduces input filter capacitor appearance value and volume, as shown in Figure 2.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a Bidirectional up-down straightening current converter that is applied to energy-storage system is characterized in that, described Bidirectional up-down straightening current converter is included in the energy-storage system, and described Bidirectional up-down straightening current converter comprises input capacitance C
i, filter inductance L
m, transistor S
1, transistor S
2With output capacitance C
0The anode of energy-storage system connects input capacitance C
iPositive pole and filter inductance L
mOne end; Described filter inductance L
mThe other end connects transistor S
1Drain electrode and transistor S
2The common point of source electrode; Described transistor S
2Drain electrode connects output capacitance C
0Positive pole and the input side of energy storage combining inverter anodal; Described energy storage combining inverter input side negative pole connects output capacitance C
0Negative pole, transistor S
1Source electrode, input capacitance C
iNegative pole and battery cathode.
2. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that, described transistor S
1With transistor S
2Be the insulated gate bipolar transistor IGBT switching tube; Described IGBT switching tube is comprised of antiparallel diode and triode.
3. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that described input capacitance C
iThe current ripples that is used for the output of filtering battery or input.
4. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that, described filter inductance L
mIn a switch periods, according to the on off state of IGBT switching tube, discharge electric energy after the first store electrical energy.
5. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that, when described bidirectional Buck-Boost converter is operated in the boost mode, and described transistor S
1As switching tube, described transistor S
2Diode as fly-wheel diode; When described bidirectional Buck-Boost converter is operated in the decompression mode, described transistor S
1Diode as fly-wheel diode, described transistor S
2As switching tube.
6. Bidirectional up-down straightening current converter as claimed in claim 5 is characterized in that, described boost mode is battery charging mode according to user; Described decompression mode is the battery discharge pattern.
7. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that described output capacitance C
0Be used for the output of filtering inverter or input or current ripples.
8. Bidirectional up-down straightening current converter as claimed in claim 1 is characterized in that, described energy-storage system comprises battery pack, at least two DC converter, energy storage combining inverter and electrical networks; Described battery pack is comprised of the battery of at least one; Described battery storing is in battery rack; Be connected with the energy storage combining inverter after DC converter of each battery series connection; In the described energy storage combining inverter access electrical network; At least two DC converter parallel connections.
9. Bidirectional up-down straightening current converter as claimed in claim 8 is characterized in that, described DC converter or be Bidirectional up-down straightening current converter.
10. Bidirectional up-down straightening current converter as claimed in claim 8 is characterized in that, the electric pressure of described battery pack input is between 300V～800V; The battery of described battery pack adopts lead-acid battery, all-vanadium flow battery, sodium-sulphur battery, lithium battery, fuel cell or super capacitor.
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| CN104753146A (en) * | 2015-04-22 | 2015-07-01 | 青岛大学 | Energy feed type variable-constant-current and positive-negative-pulse fast charging device and method |
| CN105119486A (en) * | 2015-09-23 | 2015-12-02 | 三峡大学 | Low voltage stress bidirectional DC/DC converter |
| CN106505605A (en) * | 2016-12-27 | 2017-03-15 | 国网上海市电力公司 | Sodium-sulphur battery power station energy storage subsystem |
| CN107706934A (en) * | 2017-10-24 | 2018-02-16 | 华南理工大学 | A kind of two-way normal shock battery energy storage system based on resonance degaussing |
| CN109617042A (en) * | 2018-12-21 | 2019-04-12 | 浙江众邦机电科技有限公司 | A kind of control device of industrial sewing machine DC bus-bar voltage |
| CN109778433A (en) * | 2019-01-23 | 2019-05-21 | 浙江众邦机电科技有限公司 | The feedback control system and method for a kind of sewing machine and its brake energy |
| CN112041692A (en) * | 2018-05-08 | 2020-12-04 | 罗伯特·博世有限公司 | Battery cell and method for operating a battery cell |
| CN112510980A (en) * | 2020-11-30 | 2021-03-16 | 潍柴动力股份有限公司 | Active discharge method and device of bidirectional DCDC converter and storage medium |
| CN113054735A (en) * | 2019-12-26 | 2021-06-29 | 西安华为技术有限公司 | Circuit module and electronic equipment |
| CN113437775A (en) * | 2021-07-01 | 2021-09-24 | 深圳市德兰明海科技有限公司 | Reverse connection preventing circuit and energy storage inverter |
| CN113746328A (en) * | 2021-09-08 | 2021-12-03 | 广州金升阳科技有限公司 | Power-down holding circuit and control method |
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Cited By (14)
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| CN104753146B (en) * | 2015-04-22 | 2017-03-08 | 青岛大学 | A kind of energy change constant current value positive negative pulse stuffing quick charge device and method |
| CN104753146A (en) * | 2015-04-22 | 2015-07-01 | 青岛大学 | Energy feed type variable-constant-current and positive-negative-pulse fast charging device and method |
| CN105119486A (en) * | 2015-09-23 | 2015-12-02 | 三峡大学 | Low voltage stress bidirectional DC/DC converter |
| CN106505605A (en) * | 2016-12-27 | 2017-03-15 | 国网上海市电力公司 | Sodium-sulphur battery power station energy storage subsystem |
| CN107706934B (en) * | 2017-10-24 | 2023-07-18 | 华南理工大学 | Bidirectional forward battery energy storage system based on resonance demagnetization |
| CN107706934A (en) * | 2017-10-24 | 2018-02-16 | 华南理工大学 | A kind of two-way normal shock battery energy storage system based on resonance degaussing |
| CN112041692A (en) * | 2018-05-08 | 2020-12-04 | 罗伯特·博世有限公司 | Battery cell and method for operating a battery cell |
| CN109617042A (en) * | 2018-12-21 | 2019-04-12 | 浙江众邦机电科技有限公司 | A kind of control device of industrial sewing machine DC bus-bar voltage |
| CN109778433A (en) * | 2019-01-23 | 2019-05-21 | 浙江众邦机电科技有限公司 | The feedback control system and method for a kind of sewing machine and its brake energy |
| CN113054735A (en) * | 2019-12-26 | 2021-06-29 | 西安华为技术有限公司 | Circuit module and electronic equipment |
| CN112510980B (en) * | 2020-11-30 | 2022-04-26 | 潍柴动力股份有限公司 | Active discharge method and device of bidirectional DCDC converter and storage medium |
| CN112510980A (en) * | 2020-11-30 | 2021-03-16 | 潍柴动力股份有限公司 | Active discharge method and device of bidirectional DCDC converter and storage medium |
| CN113437775A (en) * | 2021-07-01 | 2021-09-24 | 深圳市德兰明海科技有限公司 | Reverse connection preventing circuit and energy storage inverter |
| CN113746328A (en) * | 2021-09-08 | 2021-12-03 | 广州金升阳科技有限公司 | Power-down holding circuit and control method |
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Application publication date: 20130313 |