CN203406794U - Large power distributed energy storage current transformer - Google Patents
Large power distributed energy storage current transformer Download PDFInfo
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- CN203406794U CN203406794U CN201320515596.XU CN201320515596U CN203406794U CN 203406794 U CN203406794 U CN 203406794U CN 201320515596 U CN201320515596 U CN 201320515596U CN 203406794 U CN203406794 U CN 203406794U
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Abstract
The utility model discloses a large power distributed energy storage current transformer. The two ends of the large power distributed energy storage current transformer are connected with a power grid and a battery, and the large power distributed energy storage current transformer comprises a main circuit and a controller for controlling the current transformer to work. The main circuit comprises a DC/DC conversion circuit, a bus capacitor, an AC/DC conversion circuit, a filter circuit and an isolation transformer. The DC/DC conversion circuit is connected with the battery, the isolation transformer is connected with the power grid. The large power distributed energy storage current transformer also comprises a charging/discharging buffer interface circuit which is arranged between the DC/DC conversion circuit and the battery and is used for limiting a charging current of the battery, and the DC/DC conversion circuit possesses the boost and buck functions. The large power distributed energy storage current transformer of the utility model solves the initial zero voltage charging problem of a VBR battery, so that the VBR battery satisfies the requirements of a charging characteristic curve.
Description
Technical field
The utility model relates to electric power quality technical field, in particular, and particularly a kind of high-power distributed energy storage current transformer.
Background technology
Along with China's economy constantly soars, distribution network fast development, the appearance of the large power energy storage batteries such as the exploitation of regenerative resource and VBR thereof, distributed bidirectional energy accumulation current converter is as the important component part of intelligent grid, the stability of its operation directly has influence on electrical network, energy-storage system and user's thereof safety and stability, for the special-purpose bi-directional inverter of VBR, rely on traditional bi-directional inverter, be often difficult to reach the requirement of VBR charging characteristic curve and no-voltage charging thereof.Therefore, develop a kind of high-power distributed energy storage bi-directional inverter, there is extremely wide market, and lay the foundation for the development of following intelligent grid and distributed energy storage system thereof.
Utility model content
The purpose of this utility model is, for there being the technical problem that can not meet VBR zero-voltage batteries charging requirement in prior art, to provide a kind of high-power distributed energy storage current transformer.
In order to solve problem set forth above, the technical solution adopted in the utility model is:
A kind of high-power distributed energy storage current transformer, it is connected in electrical network and battery two ends, the controller that comprises main circuit and control this current transformer work, described main circuit comprises the DC/DC translation circuit connecting successively, bus capacitor, AC/DC translation circuit, filter circuit and isolating transformer, described DC/DC translation circuit is connected with battery, described isolating transformer is connected with electrical network, it also comprises is located between DC/DC translation circuit and battery and discharges and recharges buffer interface circuit for what limit battery charge, and described DC/DC translation circuit is one to have and boost and the translation circuit of buck functionality.
According to a preferred embodiment of the present utility model: described in discharge and recharge buffer interface circuit and comprise DC circuit breaker, voltage sensor, current sensor, direct current auxiliary contactor, branch road main contactor and buffer circuit, described DC circuit breaker is installed on the bus that is positioned at battery one side, described direct current auxiliary contactor and parallel with one another being installed on of branch road main contactor are positioned on the bus of DC/DC translation circuit one side, described buffer circuit is connected with direct current auxiliary contactor, described voltage sensor is installed on the bus between DC circuit breaker and branch road main contactor, described current sensor is installed on the bus between branch road main contactor and DC/DC translation circuit.
According to a preferred embodiment of the present utility model: described DC/DC translation circuit comprises the first electric capacity, the second electric capacity, inductance, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, described the first electric capacity is positioned at and discharges and recharges buffer interface circuit one side, and described first electric capacity one end is connected with inductance one end, the other end is connected with the grid of the first insulated gate bipolar transistor, the described inductance other end respectively with the drain electrode of the first insulated gate bipolar transistor, the grid of the second insulated gate bipolar transistor connects, described the second electric capacity is connected between the grid of the first insulated gate bipolar transistor and the drain electrode of the second insulated gate bipolar transistor.
According to a preferred embodiment of the present utility model: described AC/DC translation circuit is three brachium pontis three-phase inverters.
According to a preferred embodiment of the present utility model: described controller comprises interconnective dsp controller and RAM controller; between described dsp controller and main circuit, be also provided with drive circuit and protective circuit; between described dsp controller and electrical network, battery, be equipped with transducer, described RAM controller is also connected with display, keyboard, fan, buzzer and communication interface.
According to a preferred embodiment of the present utility model: the model of described dsp controller is TMS320C28335.
According to a preferred embodiment of the present utility model: described communication interface is RS485 interface, and this interface adopts IEC61850 or MODBUS communication protocol.
Compared with prior art, the beneficial effects of the utility model are:
1, adopted to have and boosted and the DC/DC translation circuit of buck functionality has been realized the two-way flow of current transformer energy;
What 2, between DC/DC translation circuit and battery, be provided for limiting battery charge discharges and recharges buffer interface circuit, has solved the problem of the initial no-voltage charging of VBR, makes it meet the requirement of charging characteristic curve.
Accompanying drawing explanation
Fig. 1. be the frame diagram of high-power distributed energy storage current transformer of the present utility model.
Fig. 2. be main circuit diagram frame diagram in high-power distributed energy storage current transformer of the present utility model.
Fig. 3. be the circuit diagram of DC/DC translation circuit in high-power distributed energy storage current transformer of the present utility model.
Fig. 4. for discharging and recharging the circuit diagram of buffer interface circuit in high-power distributed energy storage current transformer of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Consult shown in Fig. 1-Fig. 2, a kind of high-power distributed energy storage current transformer that the utility model provides, it is connected in electrical network and battery two ends, the controller that comprises main circuit and control this current transformer work, described main circuit comprises the DC/DC translation circuit connecting successively, bus capacitor C, AC/DC translation circuit, filter circuit and isolating transformer, described DC/DC translation circuit is connected with battery, described isolating transformer is connected with electrical network, it also comprises is located between DC/DC translation circuit and battery and discharges and recharges buffer interface circuit for what limit battery charge, and described DC/DC translation circuit is one to have and boost and the translation circuit of buck functionality.
Owing to adopting vanadium flow battery (being VBR) when the initial charge, inside battery initial voltage is 0V.And different due to vanadium flow battery operation principle and initial voltage and conventional storage battery are brought certain difficulty to charging, particularly initial charge.When initial charge, the moment of connecting with battery is similar to Short-circuit Working Condition, the impulse current producing is the several times while charging normal, and is all a very large impact, so brings no small difficulty to initial charge for vanadium liquid stream itself and energy accumulation current converter.As the vanadium flow battery with 20kW unit, when charging normal, charging voltage should be 56V, and charging current can not be greater than 140A.And when initial charge, charging voltage should guarantee to be greater than 39V, the charging current providing should be more than 80A, otherwise its inner can protection, causes charging unsuccessfully.For general energy accumulation current converter, no matter be to charge normal, or when initial charge, all should be able to meet the requirement of vanadium flow battery like this.But particular job state during due to initial charge, wants to guarantee under similar Short-circuit Working Condition, enough charging voltage and charging currents can also be provided, and not trigger the protection of vanadium flow battery inside, this brings certain difficulty to the design of energy accumulation current converter.Therefore, one of the utility model design discharges and recharges buffer interface circuit and realizes this function.
Consult shown in Fig. 4, the described buffer interface circuit that discharges and recharges comprises DC circuit breaker QF1, voltage sensor TV1, current sensor TA1, direct current auxiliary contactor KM1, branch road main contactor KM2 and buffer circuit R1, described DC circuit breaker QF1 is installed on the bus that is positioned at battery one side, described direct current auxiliary contactor KM1 and parallel with one another being installed on of branch road main contactor KM2 are positioned on the bus of DC/DC translation circuit one side, described buffer circuit R1 connects with direct current auxiliary contactor KM1, described voltage sensor TV1 is installed on the bus between DC circuit breaker QF1 and branch road main contactor KM2, described current sensor TA1 is installed on the bus between branch road main contactor KM2 and DC/DC translation circuit.This operation principle that discharges and recharges buffer interface circuit is:
Can be as required, resistance value and the power grade of choose reasonable buffer circuit R1, the impulse current in the time of can be by initial charge is limited in safe range, guarantees that energy accumulation current converter output voltage is not pulled low to start battery protection lower voltage limit by battery; In addition, by closure and the shutoff of certain sequencing control direct current auxiliary contactor KM1 and branch road main contactor KM2, in the time of just can solving vanadium liquid and flow initial charge impulse current greatly, the difficult problem that can not successfully charge.In addition, this discharges and recharges buffer interface circuit when vanadium flow battery discharges, if according to certain sequential working, can also reduce the impulse current of energy accumulation current converter booting moment, and effectively protection system Primary Component, guarantees system even running.Be specially:
When initial charge, connecting under the prerequisite of vanadium flow battery and energy accumulation current converter, DC circuit breaker QF1 manually closes.At energy accumulation current converter, enter after charge mode, first control direct current auxiliary contactor KM1 closed, owing to there being the metering function of buffer resistance R1, within charged electrical fails to be convened for lack of a quorum and is limited in safe range, the voltage of vanadium flow battery can slowly rise.Controller can detect the voltage of charging and the electric current of charging in real time by voltage sensor TV1 and current sensor TA1, when charging voltage being detected, reach (now thinking that initial charge start-up course finishes) while charging normal voltage, control again direct current main contactor KM2 closed, by buffer resistance R1 branch, short-circuit, after time delay a period of time, can control direct current auxiliary contactor KM1 and disconnect, by cut the going out of buffer resistance R1 branch road.So far, charge initiation process completes, and enters normal charging condition.
Consult shown in Fig. 3, described DC/DC translation circuit comprises the first capacitor C 1, the second capacitor C 2, inductance L 1, the first insulated gate bipolar transistor IGBT 1, the second insulated gate bipolar transistor IGBT 2, described the first capacitor C 1 is positioned at and discharges and recharges buffer interface circuit one side, and described first capacitor C 1 one end is connected with inductance L 1 one end, the other end is connected with the grid of the first insulated gate bipolar transistor IGBT 1, described inductance L 1 other end respectively with the drain electrode of the first insulated gate bipolar transistor IGBT 1, the grid of the second insulated gate bipolar transistor IGBT 2 connects, described the second capacitor C 2 is connected between the grid of the first insulated gate bipolar transistor IGBT 1 and the drain electrode of the second insulated gate bipolar transistor IGBT 2, the operation principle of this DC/DC translation circuit is:
When battery discharge, DC/DC translation circuit need to complete boost function, and energy flows to high-pressure side by battery side.Now, by the first capacitor C 1, inductance L 1, the first insulated gate bipolar transistor IGBT 1, the inner integrated anti-paralleled diode of the second insulated gate bipolar transistor IGBT 2 and C2, form booster circuit.Guaranteeing under the prerequisite of the second insulated gate bipolar transistor IGBT 2 reliable turn-offs simultaneously, according to certain control strategy (it is setup control program in controller as required), control the first insulated gate bipolar transistor IGBT 1 and open and turn-off with certain switching frequency and duty ratio, this circuit can complete boost function; And when charge in batteries, DC/DC translation circuit need to complete buck functionality, energy flows to storage battery side by high-pressure side.Now, by the first capacitor C 1, inductance L 1, the inner integrated anti-paralleled diode of the first insulated gate bipolar transistor IGBT 1, the second insulated gate bipolar transistor IGBT 2 and the second capacitor C 2, form reduction voltage circuit, guaranteeing under the prerequisite of the first insulated gate bipolar transistor IGBT 1 reliable turn-off equally, according to certain control strategy (its also as required setup control program in controller), control the second insulated gate bipolar transistor IGBT 2 and open and turn-off with certain switching frequency and duty ratio, this circuit can complete buck functionality.
Further, AC/DC translation circuit is three brachium pontis three-phase inverters.Described controller comprises interconnective dsp controller and RAM controller, and the model of the dsp controller that the utility model is selected is TMS320C28335.Between described dsp controller and main circuit, be also provided with drive circuit and protective circuit; this drive circuit is general IGBT drive circuit, and protective circuit can design DC overvoltage protection, overcurrent protection, input reverse-connection protection, short-circuit protection, ground protection (having fault detection capability), under-voltage/overvoltage protection, overload protection, overtemperature protection, mistake/underfrequency protection, three-phase imbalance protection and warning, phase protection and resistance to earth monitoring and warning function as required.
Between described dsp controller and electrical network, battery, be equipped with transducer, described RAM controller is also connected with display, keyboard, fan, buzzer and communication interface, and this communication interface is RS485 interface, RS485 interface adopts IEC61850 or MODBUS communication protocol.Mainly realize the main and outside micro-grid monitoring system of energy accumulation current converter and carry out information exchange, energy accumulation current converter will be delivered to micro-grid monitoring system backstage and can receive order and the definite value that backstage issues in the running status of self.
High-power distributed energy storage converter of the present utility model is as the electric interfaces of electrical network and energy-storage system, in New-energy power system, play vital effect, the electric energy that regenerative resource is sent, through current transformer conversion storage and the grid-connected safety and stability that can improve operation of power networks, has improved the power supply quality of electrical network to a great extent.And high-power distributed energy storage converter of the present utility model is serving as the effect of core cell in whole electric energy storing system, direct relation accuracy, reliability and the response speed of whole energy-storage system operation.The function of its realization mainly comprises: when battery discharge by the converting direct-current voltage into alternating-current voltage of its generation, feed-in electrical network; And when battery charges, convert line voltage to direct voltage, supply with battery; Can also when grid cut-off, critical load be powered, both lonely network operation, had peak load shifting function simultaneously.Mainly can also realize following functions: 1, energy accumulation current converter can be controlled its active power output according to the instruction of microgrid supervisory control system.By setting program in dsp chip, make energy accumulation current converter can receive also real-time tracking and carry out the active power control signal that microgrid supervisory control system sends, according to and the signal such as voltage on line side, frequency, microgrid supervisory control system control command automatically regulate meritorious output, guarantee that its peak power output and power variation rate are no more than set-point, under electric network fault and special operational mode, guarantee stability of power system; 2, energy accumulation current converter can regulate idle output according to signal real-time trackings such as AC voltage levvl, microgrid supervisory control system control commands, and the parameters such as its regulative mode, reference voltage, voltage regulation, power factor can be set by outside microgrid supervisory control system; 3, during the lonely network operation of micro-electrical network, energy accumulation current converter is operated under V/F control strategy, can guarantee that microgrid voltage, frequency are constant, supports the stable operation of whole micro-grid system as main power source; 4, energy accumulation current converter can be realized constant current charge, constant voltage charge, the charging of permanent power and custom curve charging; The functions such as constant-current discharge, pressure limiting electric discharge and permanent power discharge.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (7)
1. a high-power distributed energy storage current transformer, it is connected in electrical network and battery two ends, the controller that comprises main circuit and control this current transformer work, described main circuit comprises the DC/DC translation circuit connecting successively, bus capacitor, AC/DC translation circuit, filter circuit and isolating transformer, described DC/DC translation circuit is connected with battery, described isolating transformer is connected with electrical network, it is characterized in that: also comprise and be located between DC/DC translation circuit and battery and discharge and recharge buffer interface circuit for what limit battery charge, and described DC/DC translation circuit is one to have and boost and the translation circuit of buck functionality.
2. high-power distributed energy storage current transformer according to claim 1, it is characterized in that: described in discharge and recharge buffer interface circuit and comprise DC circuit breaker (QF1), voltage sensor (TV1), current sensor (TA1), direct current auxiliary contactor (KM1), branch road main contactor (KM2) and buffer circuit (R1), described DC circuit breaker (QF1) is installed on the bus that is positioned at battery one side, described direct current auxiliary contactor (KM1) and parallel with one another being installed on of branch road main contactor (KM2) are positioned on the bus of DC/DC translation circuit one side, described buffer circuit (R1) is connected with direct current auxiliary contactor (KM1), described voltage sensor (TV1) is installed on the bus being positioned between DC circuit breaker (QF1) and branch road main contactor (KM2), described current sensor (TA1) is installed on the bus being positioned between branch road main contactor (KM2) and DC/DC translation circuit.
3. high-power distributed energy storage current transformer according to claim 1, it is characterized in that: described DC/DC translation circuit comprises the first electric capacity (C1), the second electric capacity (C2), inductance (L1), the first insulated gate bipolar transistor (IGBT1), the second insulated gate bipolar transistor (IGBT2), described the first electric capacity (C1) is positioned at and discharges and recharges buffer interface circuit one side, and described the first electric capacity (C1) one end is connected with inductance (L1) one end, the other end is connected with the grid of the first insulated gate bipolar transistor (IGBT1), described inductance (L1) other end respectively with the drain electrode of the first insulated gate bipolar transistor (IGBT1), the grid of the second insulated gate bipolar transistor (IGBT2) connects, described the second electric capacity (C2) is connected between the grid of the first insulated gate bipolar transistor (IGBT1) and the drain electrode of the second insulated gate bipolar transistor (IGBT2).
4. according to the high-power distributed energy storage current transformer described in claim 2 or 3, it is characterized in that: described AC/DC translation circuit is three brachium pontis three-phase inverters.
5. according to the high-power distributed energy storage current transformer described in claim 2 or 3; it is characterized in that: described controller comprises interconnective dsp controller and RAM controller; between described dsp controller and main circuit, be also provided with drive circuit and protective circuit; between described dsp controller and electrical network, battery, be equipped with transducer, described RAM controller is also connected with display, keyboard, fan, buzzer and communication interface.
6. high-power distributed energy storage current transformer according to claim 5, is characterized in that: the model of described dsp controller is TMS320C28335.
7. high-power distributed energy storage current transformer according to claim 5, is characterized in that: described communication interface is RS485 interface, and this interface adopts IEC61850 or MODBUS communication protocol.
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| CN201320515596.XU CN203406794U (en) | 2013-08-23 | 2013-08-23 | Large power distributed energy storage current transformer |
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| CN201320515596.XU CN203406794U (en) | 2013-08-23 | 2013-08-23 | Large power distributed energy storage current transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441694A (en) * | 2013-08-23 | 2013-12-11 | 广西电网公司电力科学研究院 | Large-power distribution type energy storage converter |
| CN107351710A (en) * | 2017-07-17 | 2017-11-17 | 西安迅湃快速充电技术有限公司 | The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system |
| CN111490686A (en) * | 2020-04-15 | 2020-08-04 | 北京金茂绿建科技有限公司 | Energy storage converter heat management device and method |
| CN112204804A (en) * | 2018-06-08 | 2021-01-08 | 奈克斯跟踪器有限公司 | Battery management architecture for flow batteries |
| CN112688301A (en) * | 2020-12-03 | 2021-04-20 | 南方电网科学研究院有限责任公司 | Method for improving capacitance damping of direct current system |
-
2013
- 2013-08-23 CN CN201320515596.XU patent/CN203406794U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441694A (en) * | 2013-08-23 | 2013-12-11 | 广西电网公司电力科学研究院 | Large-power distribution type energy storage converter |
| CN107351710A (en) * | 2017-07-17 | 2017-11-17 | 西安迅湃快速充电技术有限公司 | The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system |
| CN112204804A (en) * | 2018-06-08 | 2021-01-08 | 奈克斯跟踪器有限公司 | Battery management architecture for flow batteries |
| EP3804023A4 (en) * | 2018-06-08 | 2022-05-04 | NEXTracker, Inc. | Battery management architectures for flow batteries |
| AU2019282598B2 (en) * | 2018-06-08 | 2022-09-29 | Nextracker Inc. | Battery management architectures for flow batteries |
| US11522383B2 (en) | 2018-06-08 | 2022-12-06 | Nextracker Llc | Battery management architectures for flow batteries |
| US11757297B2 (en) | 2018-06-08 | 2023-09-12 | Nextracker Llc | Battery management architectures for flow batteries |
| CN111490686A (en) * | 2020-04-15 | 2020-08-04 | 北京金茂绿建科技有限公司 | Energy storage converter heat management device and method |
| CN111490686B (en) * | 2020-04-15 | 2021-10-08 | 北京金茂绿建科技有限公司 | Energy storage converter heat management device and method |
| CN112688301A (en) * | 2020-12-03 | 2021-04-20 | 南方电网科学研究院有限责任公司 | Method for improving capacitance damping of direct current system |
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Granted publication date: 20140122 |