CN203827203U - High-power optical storage integrated converter - Google Patents
High-power optical storage integrated converter Download PDFInfo
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- CN203827203U CN203827203U CN201420208376.7U CN201420208376U CN203827203U CN 203827203 U CN203827203 U CN 203827203U CN 201420208376 U CN201420208376 U CN 201420208376U CN 203827203 U CN203827203 U CN 203827203U
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- 238000003860 storage Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 title claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 238000004146 energy storage Methods 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 32
- 230000001939 inductive effect Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 230000001012 protector Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 19
- 102100021650 ER membrane protein complex subunit 1 Human genes 0.000 description 4
- 101000896333 Homo sapiens ER membrane protein complex subunit 1 Proteins 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 102100037527 ER membrane protein complex subunit 2 Human genes 0.000 description 1
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- 101000880998 Homo sapiens ER membrane protein complex subunit 2 Proteins 0.000 description 1
- 101000880977 Homo sapiens ER membrane protein complex subunit 3 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a high-power optical storage integrated converter, relates to the technical field of distributed generation power electronic equipment, and aims to provide an optical storage integrated converter capable of effectively reducing a battery side harmonic current. The main point of the technical scheme is that the high-power optical storage integrated converter comprises a photovoltaic battery DC branch circuit, a power storage battery DC branch circuit, a bus capacitor and an AC branch circuit. In the power storage DC branch circuit, a power storage battery, a switch Q1, a first DC branch circuit filter, a first LCL filter network and a first bidirectional half-bridge circuit are connected in sequence; the first bidirectional half-bridge circuit is connected to the bus capacitor; and the photovoltaic battery DC branch circuit and the power storage battery DC branch circuit have the same structure. In the AC branch circuit, a three-phase inverter unit is connected to a DC bus, and the three-phase inverter unit, a three-phase LCL filter network, a switch KM3 and an AC filter are connected in sequence with a three-phase AC wiring terminal.
Description
Technical Field
The utility model relates to a distributed generation's power electronic device technical field, specific novel converter of photovoltaic grid-connected inverter, energy storage converter integration that says so is applicable to large-scale from, grid-connected photovoltaic energy storage power station.
Background
With the gradual deepening of the world on solar energy application, solar photovoltaic power generation begins to play an increasingly important role in supplying power for life of people. In the prior art, factors such as instability of solar photovoltaic power generation, day and night alternation and the like have great hidden danger and threat to safe and stable operation of a power grid, and a battery energy storage technology is used for supplementing new energy such as photovoltaic energy and the like, so that the whole system can become a controllable source, and the stability of system power scheduling is ensured.
However, at the present stage, a photovoltaic grid-connected inverter and an energy storage converter used by a high-power off-grid and grid-connected power station are independent and separated, communication coordination is needed between the photovoltaic grid-connected inverter and the energy storage converter, a complex energy management strategy is needed, and the instantaneous power requirement of a power grid on the energy storage converter cannot be met. In addition, when the existing energy storage converter works, the harmonic current on the battery side is large, and the power supply quality is influenced.
SUMMERY OF THE UTILITY MODEL
The invention of the utility model aims to: in order to solve the problems, the integrated converter of the photovoltaic grid-connected inverter and the energy storage converter can effectively reduce harmonic current on the battery side.
The utility model discloses a technical scheme be like: the photovoltaic energy storage battery direct current branch circuit comprises a photovoltaic battery direct current branch circuit, an energy storage battery direct current branch circuit, a bus capacitor and an alternating current branch circuit.
In the energy storage battery direct current branch circuit, the output end of the energy storage battery is connected with the input end of a first direct current branch circuit filter through a switch Q1, the positive pole of the output end of the first direct current branch circuit filter is connected with the first input end of a first LCL filter network, and the negative pole of the output end of the first direct current branch circuit filter is connected with the second input end of the first LCL filter network; a first output end of the first LCL filter network is connected with a first input end of the first bidirectional half-bridge circuit, and a second output end of the first LCL filter network is connected with a second input end of the first bidirectional half-bridge circuit; a first output end of the first bidirectional half-bridge circuit is connected with a first terminal of the bus capacitor, and a second output end of the first bidirectional half-bridge circuit is connected with a second terminal of the bus capacitor; the output end of the energy storage battery is also connected with two input ends of the first LCL filter network through a switch KM1 and a pre-charging resistor R1.
In the photovoltaic cell direct current branch, the output end of the photovoltaic cell is connected with the input end of a second direct current branch filter through a switch Q2, the positive pole of the output end of the second direct current branch filter is connected with the first input end of a second LCL filter network, and the negative pole of the output end of the second direct current branch filter is connected with the second input end of the second LCL filter network; a first output end of the second LCL filter network is connected with a first input end of the second bidirectional half-bridge circuit, and a second output end of the second LCL filter network is connected with a second input end of the second bidirectional half-bridge circuit; the first output end of the second bidirectional half-bridge circuit is connected with the first terminal of the bus capacitor, and the second output end of the second bidirectional half-bridge circuit is connected with the second terminal of the bus capacitor; the output end of the photovoltaic cell is also connected with two input ends of the second LCL filter network through a switch KM2 and a pre-charging resistor R2.
In the alternating current branch, a first input end of a three-phase inversion unit is connected with a first terminal of the direct current bus, and a second input end of the three-phase inversion unit is connected with a second terminal of the direct current bus; three output terminals of the three-phase inversion unit are correspondingly connected with three input ends of the three-phase LCL filter network; three output ends of the three-phase LCL filter network are correspondingly connected with three input ends of the alternating current filter through a switch KM3, and three output ends of the alternating current filter are correspondingly connected with a three-phase alternating current wiring terminal.
Further, a second input end of the first LCL filter network is connected with a second input end of the second LCL filter network; and the first direct current filter, the second direct current filter, the switch KM1, the switch KM2 and a branch circuit connected with the second input end of the first LCL filter network also comprise an anti-reverse diode.
Furthermore, the bidirectional half-bridge circuit comprises two insulated gate bipolar transistors which are connected in series from top to bottom, an emitting electrode of the insulated gate bipolar transistor positioned above is connected with a collecting electrode of the insulated gate bipolar transistor positioned below, a common connecting end of the two insulated gate bipolar transistors is a first input end of the bidirectional half-bridge circuit, an emitting electrode of the insulated gate bipolar transistor positioned below is a second input end and a second output end of the bidirectional half-bridge circuit, and a collecting electrode of the insulated gate bipolar transistor positioned above is a first output end of the bidirectional half-bridge circuit.
Furthermore, the device also comprises 4 voltage detection circuits and 5 current detection circuits; the first voltage detection circuit is used for detecting the voltage of the energy storage battery; the second voltage detection circuit is used for detecting the voltage of the photovoltaic cell; the third voltage detection circuit is used for detecting the voltage at two ends of the bus capacitor; the fourth voltage detection circuit is used for detecting the voltage of the three-phase alternating current wiring terminal;
the first current detection circuit is used for detecting the current in the first direct current branch circuit; the second current detection circuit is used for detecting the current in the second direct current branch circuit; the third current detection circuit, the fourth current detection circuit and the fifth current detection circuit are respectively used for detecting three-phase currents in the alternating current branch.
Furthermore, the alternating current branch circuit also comprises a lightning protection device.
Further, the switch KM1, the switch KM2 and the switch KM3 are contactors; the switch Q1 and the switch Q2 are circuit breakers.
Further, a breaker switch Q3 is also included; and three output ends of the alternating current filter are correspondingly connected with the three-phase alternating current wiring terminal through a switch Q3.
Further, the energy storage battery is a lithium battery or a lead-acid battery.
Furthermore, the inductive reactance of the battery side inductor of the first LCL filter network is larger than the internal resistance of the energy storage battery; and the inductive reactance of the battery side inductor of the second LCL filter network is greater than the internal resistance of the photovoltaic battery.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses in two direct current branch roads parallelly connected together, through the closed state of controlling the operating mode of first, the bidirectional half-bridge circuit of second and the alternating current side you transform the unit and each switch, and then can make the converter work for the multiple operating condition such as alternating current branch road power supply, photovoltaic cell and energy storage battery are alternating current branch road power supply and alternating current branch road for energy storage battery power supply in photovoltaic cell.
2. The utility model provides an adopt LCL filter network in two direct current branch roads, the inductance L inductive reactance of battery side is greater than photovoltaic cell or energy storage battery's internal resistance, and the harmonic current of battery side reduces greatly behind the LCL wave filter.
3. And a reverse connection prevention diode is introduced, when the batteries are reversely connected, the two direct current branches are in a circuit-breaking state, and the reversely connected batteries can not influence a subsequent circuit and a power grid.
4. The circuit structure of two direct current branch roads is the same completely, the preparation and the production of circuit on the one hand, and on the other hand need not distinguish when using which direct current branch road is for connecting photovoltaic cell, which direct current branch road connects energy storage battery, convenient to use.
5. The utility model discloses in still be provided with a plurality of voltage detection circuit and current detection circuit, be convenient for gather the voltage and the current signal of different circuit part to supply with corresponding control circuit, provide accurate foundation for control.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the photovoltaic module comprises a photovoltaic cell dc branch, an energy storage cell dc branch, a bus capacitor and an ac branch.
In the dc branch of the energy storage battery, the output terminal of the energy storage battery is connected to the positive and negative input terminals of the dc branch filter EMC1 through two contacts of the breaker switch Q1, the positive terminal of the output terminal of the dc branch filter EMC1 is connected to one terminal of the inductor L1 as the first input terminal of the first LCL filter network, the negative terminal of the output terminal of the dc branch filter EMC1 is connected to the other terminal of the capacitor C1 as the second input terminal of the first LCL filter network, the other terminal of the inductor L1 is connected to one terminal of the capacitor C1 and one terminal of the inductor L2 at the same time, the other terminal of the inductor L2 as the first output terminal of the first LCL filter network is connected to the first input terminal of the bidirectional half-bridge circuit composed of the IGBTs 1 and the IGBTs 7, the other terminal of the capacitor C1 as the second output terminal of the first LCL filter network is connected to the second input terminal of the bidirectional, the L2 and the capacitor C1 form an LCL type filter network.
A first output terminal of the first bidirectional half-bridge circuit is connected to a first terminal of a bus capacitor C3 and a second output terminal of the first bidirectional half-bridge circuit is connected to a second terminal of the bus capacitor C3.
The output end of the energy storage battery is correspondingly connected with two contacts of a switch KM1, one contact of a switch KM1 is connected with one end of a pre-charging resistor R1, the other end of the pre-charging resistor R1 is connected with a first input end of a first LCL filter network, and the other contact of a switch LM1 is connected with a second input end of the first LCL filter network.
The energy storage battery may be a lithium battery or a lead acid battery.
The structure of the photovoltaic cell direct current branch is completely the same as that of the energy storage direct current branch, and the output end of the photovoltaic cell is connected with the positive input end and the negative input end of the second direct current branch filter through two contacts of the switch Q2. The positive electrode of the output end of the second direct current branch filter is connected with the first input end of the second LCL filter network, and the negative electrode of the output end of the second direct current branch filter is connected with the second input end of the second LCL filter network; a first output end of the second LCL filter network is connected with a first input end of a second bidirectional half-bridge circuit consisting of IGBTs 2 and 4, and a second output end of the second LCL filter network is connected with a second input end of the second bidirectional half-bridge circuit; a first output terminal of the second bidirectional half-bridge circuit is connected to a first terminal of a bus capacitor C3, and a second output terminal of the second bidirectional half-bridge circuit is connected to a second terminal of the bus capacitor C3.
The second LCL filter network comprises inductors L3 and L4 and a capacitor C2, one end of the inductor L3 is used as a first input end of the second LCL filter network, the other end of the inductor L3 is connected with one end of the capacitor C2 and one end of the inductor L4, the other end of the inductor L4 is used as a first output end of the second LCL filter network, and the other end of the capacitor C2 is used as a second input end and a second output end of the second LCL filter network.
The output end of the photovoltaic cell is correspondingly connected with two contacts of a switch KM2, one contact of a switch KM2 is connected with one end of a pre-charging resistor R2, the other end of the pre-charging resistor R2 is connected with a first input end of a second LCL filter network, and the other contact of a switch LM2 is connected with a second input end of the second LCL filter network.
In the alternating current branch, a first input end of a three-phase inversion unit composed of IGBTs 5-10 is connected with a first terminal of the direct current bus C3, and a second input end of the three-phase inversion unit is connected with a second terminal of the direct current bus C3; three output terminals of the three-phase inversion unit are correspondingly connected with three input ends of the three-phase LCL filter network; three output ends of the three-phase LCL filter network are correspondingly connected with three input ends of an alternating current filter EMC3 through a three-contact switch KM3, and three output ends of the alternating current filter are correspondingly connected with a three-phase alternating current wiring terminal U, V, W.
The second input end of the first LCL filter network is connected with the second input end of the second LCL filter network; and a reverse connection prevention diode is further included on a branch circuit where the first direct current filter, the second direct current filter, the switch KM1 and the switch KM2 are connected with the second input end of the first LCL filter network, and the anode of the reverse connection prevention diode is connected with the second input end of the first LCL filter network.
Further, the first bidirectional half-bridge circuit comprises two insulated gate bipolar transistors IGBT1 and IGBT3 which are connected in series from top to bottom, an emitter of the IGBT1 located above is connected with a collector of the IGBT3 located below, a common connection end of the two insulated gate bipolar transistors is a first input end of the first bidirectional half-bridge circuit, an emitter of the IGBT3 located below is a second input end and a second output end of the bidirectional half-bridge circuit, and a collector of the IGBT1 located above is a first output end of the first bidirectional half-bridge circuit.
The second bidirectional half-bridge circuit comprises two insulated gate bipolar transistors IGBT2 and IGBT4 connected in series up and down, and the connection relationship is completely the same as that of the IGBTs 1 and IGBT3 in the first bidirectional half-bridge circuit, which is not described herein again.
The inverter unit in the AC branch is also composed of 6 Insulated Gate Bipolar Transistors (IGBT) 5-10, and the connection relationship is a typical PWM inverter structure.
Control above-mentioned 10 insulated gate bipolar transistor's grid can make the utility model discloses the work of dc-to-ac converter is multiple operating condition such as energy storage battery power supply at photovoltaic cell, photovoltaic cell for exchanging branch power supply, photovoltaic cell and energy storage battery for exchanging branch power supply and exchanging the branch road for energy storage battery power supply.
In consideration of providing accurate voltage and current parameters for the control of the converter, the converter further comprises 4 voltage detection circuits and 5 current detection circuits CT 1-5 in another embodiment of the invention; the first voltage detection circuit is used for detecting the voltage of the energy storage battery; the second voltage detection circuit is used for detecting the voltage of the photovoltaic cell; the third voltage detection circuit is used for detecting the voltage at two ends of the bus capacitor; the fourth voltage detection circuit is used for detecting the voltage of the three-phase alternating current wiring terminal.
The first current detection circuit CT1 is used for detecting the current in the first dc branch; the second current detection circuit CT2 is used for detecting the current in the second dc branch; the third current detecting circuit CT3, the fourth current detecting circuit CT4 and the fifth current detecting circuit CT5 are respectively used for detecting the current of the three-phase branch in the ac branch.
In other embodiments, a switch Q3 is also included; and three output ends of the alternating current filter are correspondingly connected with the three-phase alternating current wiring terminal through a switch Q3. The switch KM1, the switch KM2 and the switch KM3 are contactors; the switch Q1, the switch Q2 and the switch Q3 are circuit breakers for protection.
To prevent lightning surges, a lightning protector is also included in the ac branch, which may be connected in the branch between the switch Q3 and the three-phase ac terminals.
In order to more clearly illustrate the operation process of the high-power optical storage integrated converter, the operation process thereof will be described in detail with reference to the accompanying drawings.
Two direct current sides of the high-power light storage integrated converter are respectively connected with a lithium battery/lead-acid battery and a solar photovoltaic battery. Before the direct current branch works, the pre-charging contactors KM1 and KM2 are controlled to be attracted, the contactor KM3 is disconnected, the circuit breakers Q1, Q2 and Q3 are disconnected, and at the moment, the photovoltaic battery and the energy storage battery charge the bus capacitor through the pre-charging resistors R1 and R2 respectively. After the pre-charging is finished, the breakers Q1, Q2, Q3 and the contactor KM3 are switched on, the pre-charging contactors KM1 and KM2 are switched off, and after the breakers are switched on, the direct currents of the two direct current branches are boosted or reduced in voltage through the direct current branch filters EMC1, EMC2 and the first and second bidirectional half-bridge circuits. The on-off time of the four IGBT 1-4 tubes is controlled, so that the first bidirectional half-bridge circuit and the second bidirectional half-bridge circuit can be in a voltage boosting or voltage reducing working mode.
Particularly, the LCL filter network is selected and used in the dc branch, and considering that the requirement of the energy-storing lithium battery/lead-acid battery for current harmonics is high, in order to prolong the service life of the battery, measures must be taken to reduce the harmonic current of the battery. Because the internal resistance of the battery is very small, the LC filtering mode is mostly used at present, the capacitive reactance of the filtering capacitor is larger than the internal resistance of the battery, and the capacitor of the LC filtering cannot filter out harmonic waves. In the LCL filter network used here, the L inductive reactance at the battery side is larger than the internal resistance of the battery, and the harmonic current is greatly reduced after passing through the LCL filter network.
Because the energy of the energy storage battery branch needs to flow bidirectionally, a bidirectional half-bridge circuit is adopted, the energy can flow bidirectionally and can work as a boosting circuit or a voltage reduction circuit. The energy of the photovoltaic branch circuit can only be from the photovoltaic cell to the bus capacitor, and a bidirectional half-bridge circuit is also adopted here to ensure that the two direct current branch circuits are symmetrical in structure and easy to produce. Based on the characteristic that the photovoltaic cell direct current branch circuit can only flow in a single direction, the current can only flow from the photovoltaic cell to the bus capacitor in the control process.
The voltage on the bus capacitor C3 is transmitted to the three-phase ac limit terminal U, V, W through the ac inverter unit, the ac filter and the lightning arrester, so as to supply power to the power grid.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A high-power light-storage integrated converter is characterized by comprising a photovoltaic battery direct-current branch, an energy storage battery direct-current branch, a bus capacitor and an alternating-current branch;
in the energy storage battery direct current branch circuit, the output end of the energy storage battery is connected with the input end of a first direct current branch circuit filter through a switch Q1, the positive pole of the output end of the first direct current branch circuit filter is connected with the first input end of a first LCL filter network, and the negative pole of the output end of the first direct current branch circuit filter is connected with the second input end of the first LCL filter network; a first output end of the first LCL filter network is connected with a first input end of the first bidirectional half-bridge circuit, and a second output end of the first LCL filter network is connected with a second input end of the first bidirectional half-bridge circuit; a first output end of the first bidirectional half-bridge circuit is connected with a first terminal of the bus capacitor, and a second output end of the first bidirectional half-bridge circuit is connected with a second terminal of the bus capacitor; the output end of the energy storage battery is also connected with two input ends of the first LCL filter network through a switch KM1 and a pre-charging resistor R1;
in the photovoltaic cell direct current branch, the output end of the photovoltaic cell is connected with the input end of a second direct current branch filter through a switch Q2, the positive pole of the output end of the second direct current branch filter is connected with the first input end of a second LCL filter network, and the negative pole of the output end of the second direct current branch filter is connected with the second input end of the second LCL filter network; a first output end of the second LCL filter network is connected with a first input end of the second bidirectional half-bridge circuit, and a second output end of the second LCL filter network is connected with a second input end of the second bidirectional half-bridge circuit; the first output end of the second bidirectional half-bridge circuit is connected with the first terminal of the bus capacitor, and the second output end of the second bidirectional half-bridge circuit is connected with the second terminal of the bus capacitor; the output end of the photovoltaic cell is also connected with two input ends of the second LCL filter network through a switch KM2 and a pre-charging resistor R2;
in the alternating current branch, a first input end of a three-phase inversion unit is connected with a first terminal of the direct current bus, and a second input end of the three-phase inversion unit is connected with a second terminal of the direct current bus; three output terminals of the three-phase inversion unit are correspondingly connected with three input ends of the three-phase LCL filter network; three output ends of the three-phase LCL filter network are correspondingly connected with three input ends of the alternating current filter through a switch KM3, and three output ends of the alternating current filter are correspondingly connected with a three-phase alternating current wiring terminal.
2. The high-power light-storing integrated current transformer of claim 1, wherein the second input end of the first LCL filter network is connected with the second input end of the second LCL filter network; and the first direct current filter, the second direct current filter, the switch KM1, the switch KM2 and a branch circuit connected with the second input end of the first LCL filter network also comprise an anti-reverse diode.
3. The high-power integrated optical storage converter according to claim 1, wherein the bidirectional half-bridge circuit comprises two igbts connected in series, an emitter of the igbts located above is connected with a collector of the igbts located below, a common connection end of the two igbts is a first input end of the bidirectional half-bridge circuit, an emitter of the igbts located below is a second input end and a second output end of the bidirectional half-bridge circuit, and a collector of the igbts located above is a first output end of the bidirectional half-bridge circuit.
4. The high-power light-storage integrated current transformer of claim 1, further comprising 4 voltage detection circuits and 5 current detection circuits; wherein,
the first voltage detection circuit is used for detecting the voltage of the energy storage battery; the second voltage detection circuit is used for detecting the voltage of the photovoltaic cell; the third voltage detection circuit is used for detecting the voltage at two ends of the bus capacitor; the fourth voltage detection circuit is used for detecting the voltage of the three-phase alternating current wiring terminal;
the first current detection circuit is used for detecting the current in the first direct current branch circuit; the second current detection circuit is used for detecting the current in the second direct current branch circuit; the third current detection circuit, the fourth current detection circuit and the fifth current detection circuit are respectively used for detecting three-phase currents in the alternating current branch.
5. The high-power optical storage integrated converter according to claim 1, wherein the ac branch further comprises a lightning protector.
6. The integrated power optical storage converter according to claim 1, wherein the switches KM1, KM2 and KM3 are contactors; the switch Q1 and the switch Q2 are circuit breakers.
7. The high-power light-storage integrated converter according to claim 6, further comprising a circuit breaker switch Q3; and three output ends of the alternating current filter are correspondingly connected with a three-phase alternating current wiring terminal through the switch Q3.
8. The high-power integrated converter for light and storage as claimed in claim 1, wherein the energy storage battery is a lithium battery or a lead-acid battery.
9. The high-power light-storage integrated converter according to claim 1, wherein the inductive reactance of the battery side inductor of the first LCL filter network is greater than the internal resistance of the energy storage battery; and the inductive reactance of the battery side inductor of the second LCL filter network is greater than the internal resistance of the photovoltaic battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420208376.7U CN203827203U (en) | 2014-04-28 | 2014-04-28 | High-power optical storage integrated converter |
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| CN201420208376.7U CN203827203U (en) | 2014-04-28 | 2014-04-28 | High-power optical storage integrated converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467509A (en) * | 2014-12-18 | 2015-03-25 | 江苏方程电力科技有限公司 | Two-way energy storage converter |
| CN105958819A (en) * | 2016-05-03 | 2016-09-21 | 北京北变微电网技术有限公司 | Direct-current photovoltaic power generation current transformer |
| CN106712102A (en) * | 2017-03-09 | 2017-05-24 | 四川科陆新能电气有限公司 | Control system and method for reducing light abandoning power limit of photovoltaic power station |
| CN109361239A (en) * | 2018-12-05 | 2019-02-19 | 江苏中导电力有限公司 | Integral control system is filled in light storage |
-
2014
- 2014-04-28 CN CN201420208376.7U patent/CN203827203U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467509A (en) * | 2014-12-18 | 2015-03-25 | 江苏方程电力科技有限公司 | Two-way energy storage converter |
| CN104467509B (en) * | 2014-12-18 | 2016-11-16 | 江苏方程电力科技有限公司 | A kind of bidirectional energy-storage current transformer |
| CN105958819A (en) * | 2016-05-03 | 2016-09-21 | 北京北变微电网技术有限公司 | Direct-current photovoltaic power generation current transformer |
| CN105958819B (en) * | 2016-05-03 | 2019-06-04 | 北京北变微电网技术有限公司 | String type and centralized photovoltaic parallel in system can be met simultaneously |
| CN106712102A (en) * | 2017-03-09 | 2017-05-24 | 四川科陆新能电气有限公司 | Control system and method for reducing light abandoning power limit of photovoltaic power station |
| CN106712102B (en) * | 2017-03-09 | 2020-04-07 | 四川科陆新能电气有限公司 | Control system and method for reducing light abandoning and electricity limiting of photovoltaic power station |
| CN109361239A (en) * | 2018-12-05 | 2019-02-19 | 江苏中导电力有限公司 | Integral control system is filled in light storage |
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