CN111740579B - Starting method, starting circuit and energy storage converter - Google Patents
Starting method, starting circuit and energy storage converter Download PDFInfo
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- CN111740579B CN111740579B CN202010693416.1A CN202010693416A CN111740579B CN 111740579 B CN111740579 B CN 111740579B CN 202010693416 A CN202010693416 A CN 202010693416A CN 111740579 B CN111740579 B CN 111740579B
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- energy storage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The invention relates to a starting method, which comprises the following steps of S1, precharging an energy storage element of a main branch through an auxiliary precharge circuit on the main branch, and then completing the precharging of the energy storage elements on the other branches through the auxiliary precharge circuit; s2, when the difference value between the voltage of the energy storage element of the main branch and the voltage of the energy storage module of the main branch is smaller than a preset value, the energy storage module of the main branch is connected into the main branch, and the auxiliary pre-charging circuit is turned off; s3, increasing the bus voltage through the main branch so that the bus voltage is higher than the energy storage module voltage on all the branches; and S4, when the difference value between the voltage of the energy storage element of the other branch circuit and the voltage of the energy storage module of the other branch circuit is smaller than a preset value, the energy storage modules of the other branch circuits are connected into the other branch circuits. The invention has the advantages of safety and reliability. The present invention relates to a start-up circuit. The invention relates to an energy storage converter.
Description
Technical Field
The present invention relates to the field of energy storage systems, and in particular, to a starting method, a starting circuit, and an energy storage converter.
Background
In an electrochemical energy storage system of the energy storage converter (Power Conversion System, abbreviated as PCS), the device for realizing the bidirectional conversion of electric energy is connected between a battery system and a power grid (and/or a load), the charging and discharging processes of a storage battery can be controlled to perform alternating current-direct current conversion, and the device can directly supply power for an alternating current load under the condition of no power grid.
The PCS is composed of a DC/AC bidirectional converter, a control unit and the like. The PCS controller receives a background control instruction through communication, and controls the converter to charge or discharge the battery according to the sign and the size of the power instruction, so that the active power and the reactive power of the power grid are regulated. Meanwhile, the PCS CAN communicate with the BMS through the CAN interface, and CAN transmit through the dry contact point and the like, so that the state information of the battery pack CAN be obtained, the battery CAN be charged and discharged in a protective mode, and the running safety of the battery is ensured.
Referring to fig. 1, a DCDC part and an inverter DCAC part are realized by a Buck/Boost in a two-stage PCS (energy storage converter), the inverter bridge is commonly provided with a single-phase H4/H6, a three-phase three-level I-shaped and a T-shaped, and the T-shaped is selected as a demonstration.
At present, when different batteries are charged in a PCS, a plurality of different branches are required to be arranged due to different battery types, and each branch is provided with a pre-charging circuit, so that the cost is increased, and the circuit is complicated.
Disclosure of Invention
The invention aims to provide a starting method which has the characteristics of low implementation cost and simple circuit.
The first object of the present invention is achieved by the following technical solutions:
a starting method comprises the following steps:
s1, precharging energy storage elements of a main branch through an auxiliary precharge circuit on the main branch, and then precharging the energy storage elements on the other branches through the auxiliary precharge circuit;
s2, when the difference value between the voltage of the energy storage element of the main branch and the voltage of the energy storage module of the main branch is smaller than a preset value, the energy storage module of the main branch is connected into the main branch, and the auxiliary pre-charging circuit is turned off;
s3, increasing the bus voltage through the main branch so that the bus voltage is higher than the energy storage module voltage on all the branches;
and S4, when the difference value between the voltage of the energy storage element of the other branch circuit and the voltage of the energy storage module of the other branch circuit is smaller than a preset value, the energy storage modules of the other branch circuits are connected into the other branch circuits.
By adopting the technical scheme, each branch is started by arranging an auxiliary pre-charging circuit, so that the cost is reduced, and the battery can be connected with various types and specifications, so that the application range is wider; the zero current impact of the charging circuit is realized in the starting process, and the circuit is safer and more reliable.
The present invention may be further configured in a preferred example to: and a relay is arranged between each branch and the energy storage module of the branch, and when the voltage difference between the energy storage element voltage of the branch and the energy storage module voltage of the branch is smaller than a preset value, the relay between the branch and the energy storage module is closed.
The present invention may be further configured in a preferred example to: the auxiliary pre-charging circuit on the main branch is connected in series between the main branch and the energy storage module of the main branch, and the auxiliary pre-charging circuit is connected in parallel with the relay of the main branch.
The present invention may be further configured in a preferred example to: the energy storage module adopts a battery.
The invention aims at providing a starting circuit of a multi-channel battery suitable for a common inversion system, which has the characteristics of low cost and small volume.
The second object of the present invention is achieved by the following technical solutions:
a starting circuit of multi-path battery suitable for common inversion system comprises a switch module arranged at the load end of each branch, a sensor for detecting the output voltage of the branch, and an auxiliary pre-charging circuit arranged on one branch and connected in parallel with the switch module arranged on the branch, wherein the auxiliary pre-charging circuit is used for pre-charging each branch,
the sensor is used for detecting the output voltage of the branch, and when the difference value between the output voltage of the branch and the load voltage arranged on the branch is smaller than a set value, the branch switch module is closed and the auxiliary pre-charging circuit is cut off.
By adopting the technical scheme, each branch is started by arranging an auxiliary pre-charging circuit, so that the cost is reduced, and the battery can be connected with various types and specifications, so that the application range is wider; the zero current impact of the charging circuit is realized in the starting process, and the circuit is safer and more reliable.
The present invention may be further configured in a preferred example to: the switch module is a relay.
The present invention may be further configured in a preferred example to: the sensor is a voltage sensor or a current sensor.
The present invention may be further configured in a preferred example to: the auxiliary pre-charging circuit comprises a voltage dividing resistor, a switching device and a protector which are sequentially connected in series.
The present invention may be further configured in a preferred example to: the switching device is a relay.
The invention aims at providing an energy storage converter which has the characteristics of low cost, safety and reliability.
The third object of the present invention is achieved by the following technical solutions:
an energy storage converter comprising a seed-start circuit as claimed in any preceding claim.
By adopting the technical scheme, the zero-current surge is realized with low cost, simple circuit and zero current surge during starting.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. the current of each power tube is reduced by multiple branches to bear pressure, and the branches are more dispersed, so that heat dissipation is easy;
2. the access of a plurality of batteries and different types or different voltages can be supported;
3. any branch circuit can be precharged without adding a precharge circuit to each direct current.
Drawings
Fig. 1 is a circuit diagram of the background of the invention.
Fig. 2 is a schematic diagram of the first start-up phase of the present invention.
FIG. 3 is a schematic diagram of a second start-up phase of the present invention.
Fig. 4 is a schematic diagram of the present invention at start-up stage three.
Fig. 5 is a schematic diagram of the present invention at start-up phase four.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
The embodiment of the invention provides a starting circuit of a multi-path battery suitable for a common inversion system, and referring to fig. 2 to 5, three branches are adopted as demonstration, and the branches adopt Buck/Boost circuits, namely a first branch, a second branch and a third branch, and the starting circuit is not limited to the three branches in practical application and can be expanded into multiple branches.
Each branch load end is provided with a switch module and a sensor for detecting the output voltage of the branch, wherein the switch module is a relay, and the sensor is a voltage sensor or a current sensor, and the voltage sensor is adopted in the application.
An auxiliary pre-charging circuit is arranged on the first branch circuit and is connected with the switch module arranged on the branch circuit in parallel, the auxiliary pre-charging circuit is used for preventing the output voltage of the branch circuit from generating impact on the load arranged on the branch circuit,
the sensor is used for detecting the output voltage of the branch, and when the difference between the output voltage of the branch and the load voltage arranged on the branch is smaller than a set value, the branch switch module is closed and the auxiliary pre-charging circuit is cut off.
The auxiliary pre-charging circuit comprises a voltage dividing resistor, a switching device and a fuse which are sequentially connected in series, the switching device is a relay, the auxiliary pre-charging circuit is opened and closed through the relay, the voltage dividing voltage is divided to avoid the circuit from being burnt out due to overcurrent, and the fuse is adopted by the fuse, so that the circuit safety is guaranteed.
In addition, in another embodiment, an energy storage converter is provided and may include the start-up circuit described above.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, unless otherwise specified, the term "/" generally indicates that the associated object is an "or" relationship.
Embodiments of the invention are described in further detail below with reference to the drawings.
The embodiment of the invention provides a starting method of a multi-channel battery suitable for a common inversion system, which is described based on the starting circuit:
the overall thought is as follows: s1, precharging energy storage elements of a main branch through an auxiliary precharge circuit on the main branch, and then precharging the energy storage elements on the other branches through the auxiliary precharge circuit;
s2, when the difference value between the voltage of the energy storage element of the main branch and the voltage of the energy storage module of the main branch is smaller than a preset value, the energy storage module of the main branch is connected into the main branch, and the auxiliary pre-charging circuit is turned off;
s3, increasing the bus voltage through the main branch so that the bus voltage is higher than the energy storage module voltage on all the branches;
and S4, when the difference value between the voltage of the energy storage element of the other branch circuit and the voltage of the energy storage module of the other branch circuit is smaller than a preset value, the energy storage modules of the other branch circuits are connected into the other branch circuits.
The following detailed description is given to specific steps with respect to the circuit diagram, and for convenience of understanding, the following description is given: the main branch corresponds to the first branch, the energy storage element corresponds to the capacitor, the energy storage module corresponds to the battery pack, and the branch corresponds to the second branch and the third branch.
Referring to fig. 2, stage 1 is detailed: the AUX-Relay is closed, namely the auxiliary pre-charging circuit is closed, the first group of batteries BAT1 are connected in parallel through a Fuse, a resistor R1, a current sensor HCTA1 inductor L1 and a BUCK/BOOST1 to a bus capacitor, and C1C2C3 of the auxiliary pre-charging current, and at the moment, the voltage of the film capacitor C1 of the BUCK/BOOST1 branch and the bus voltage are equal to the voltage of the first branch battery.
The film capacitor C2 of the BUCK/BOOST2 branch and the film capacitor C3 of the BUCK/BOOST3 branch have no loop because the battery relay is not closed, and the voltage is 0.
Referring to fig. 3, stage 2 is detailed: and starting loops of the BUCK/BOOST2 and BUCK/BOOST3 branches to charge C22 and C33, wherein the target value of each loop is the battery voltage sampled by the branch of the loop, and the purpose is to enable the front voltage and the rear voltage of the main relay to be consistent.
Referring to fig. 4, stage 3 is detailed: after the difference value between the capacitor voltage and the battery voltage of the detection branch 1 is smaller than a certain value, closing a main relay of the branch 1, and opening an auxiliary pre-charging circuit, wherein at the moment, vbus=vbat1, and then the first branch starts up BUS boosting and slowly starting;
meanwhile, after the BUCK/BOOST2&3 of the branches 2&3 complete the consistency of the front and rear voltages of the main relays, the self-relays are closed.
Referring to fig. 5, stage 4 is detailed: the three branches support the bus together, and the inversion voltage required by the bus is generally 680-900V.
Claims (1)
1. The starting method is characterized by comprising a main branch, a plurality of branch circuits and an auxiliary pre-charging circuit connected with the main branch, wherein the main branch and the branch circuits comprise an energy storage module, a switch module and a BUCK/BOOST circuit, one end of the energy storage module is connected with one end of the switch module, the other end of the switch module is connected with one end of the BUCK/BOOST circuit, the other end of the BUCK/BOOST circuit is connected with a bus, and the auxiliary pre-charging circuit is connected with the switch module of the main branch in parallel; the energy storage module is a battery, and the switch module is a relay;
the main branch and the branch also comprise sensors for detecting the output voltage of the main branch, an energy storage element and a branch capacitor, wherein the energy storage element and the branch capacitor are connected in parallel at the bus end, the branch capacitor is connected between the BUCK/BOOST circuit and the switch module in parallel, and the energy storage element is a film capacitor;
the method comprises the following steps:
s1, precharging energy storage elements of a main branch through an auxiliary precharge circuit on the main branch, and then precharging the energy storage elements on the other branches through the auxiliary precharge circuit;
s2, starting loops of the branch circuits to charge the branch circuit capacitance of the branch circuits, wherein a target value of each loop is the battery voltage sampled by the branch circuit of the loop, so that the front voltage and the rear voltage of the relay of the main branch circuit can be consistent;
s3, when the difference value between the branch capacitor voltage of the main branch and the energy storage module voltage of the main branch is smaller than a preset value, closing a relay of the main branch, and turning off an auxiliary pre-charging circuit, wherein the main branch opens a bus to boost and slow; meanwhile, after the front and rear voltages of the relays of the branch circuits are consistent, the relays of the branch circuits are closed;
and S4, supporting the bus by the main branch and the branch so that the voltage of the bus is higher than the voltage of the energy storage modules on all the branches, and improving the inversion voltage required by the bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693416.1A CN111740579B (en) | 2020-07-17 | 2020-07-17 | Starting method, starting circuit and energy storage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693416.1A CN111740579B (en) | 2020-07-17 | 2020-07-17 | Starting method, starting circuit and energy storage converter |
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| Publication Number | Publication Date |
|---|---|
| CN111740579A CN111740579A (en) | 2020-10-02 |
| CN111740579B true CN111740579B (en) | 2023-07-21 |
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| CN202010693416.1A Active CN111740579B (en) | 2020-07-17 | 2020-07-17 | Starting method, starting circuit and energy storage converter |
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| CN116131348B (en) * | 2023-04-14 | 2023-06-27 | 澄瑞电力科技（上海）有限公司 | Box type mobile power supply starting grid-connected control method and system |
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| CN108879748A (en) * | 2018-07-20 | 2018-11-23 | 乐山智能微网技术创新研究院有限公司 | A kind of bidirectional energy-storage current transformer |
| CN110138196B (en) * | 2019-03-28 | 2021-02-12 | 深圳市禾望电气股份有限公司 | Direct-current soft start control method and system for multi-branch energy storage converter |
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