CN117293976A - Battery awakening method of energy storage converter - Google Patents
Battery awakening method of energy storage converter Download PDFInfo
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- CN117293976A CN117293976A CN202311575460.2A CN202311575460A CN117293976A CN 117293976 A CN117293976 A CN 117293976A CN 202311575460 A CN202311575460 A CN 202311575460A CN 117293976 A CN117293976 A CN 117293976A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004146 energy storage Methods 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 92
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000002955 isolation Methods 0.000 claims description 48
- 230000002457 bidirectional effect Effects 0.000 claims description 37
- 230000009191 jumping Effects 0.000 claims description 21
- 230000002618 waking effect Effects 0.000 claims description 20
- 230000000295 complement effect Effects 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 14
- 230000010363 phase shift Effects 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000005059 dormancy Effects 0.000 description 2
- UKGJZDSUJSPAJL-YPUOHESYSA-N (e)-n-[(1r)-1-[3,5-difluoro-4-(methanesulfonamido)phenyl]ethyl]-3-[2-propyl-6-(trifluoromethyl)pyridin-3-yl]prop-2-enamide Chemical compound CCCC1=NC(C(F)(F)F)=CC=C1\C=C\C(=O)N[C@H](C)C1=CC(F)=C(NS(C)(=O)=O)C(F)=C1 UKGJZDSUJSPAJL-YPUOHESYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
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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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery awakening method of an energy storage converter, which comprises the following steps: s1, detecting a real-time voltage value of a power grid, and judging whether the real-time voltage value of the power grid is in a rated value range of the power grid voltage or not; s2, controlling the pre-charging relay to be closed, so that the power grid charges the high-voltage side bus capacitor module through the pre-charging relay, a pre-charging resistor connected with the pre-charging relay in series and the inversion module; s3, detecting whether the voltage value of the high-voltage side bus capacitor module is in the rated value range of the high-voltage bus voltage; s4, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, and opening the pre-charging relay; s5, detecting whether the voltage value of the low-voltage side bus capacitor module is in the range of the rated voltage value of the low-voltage bus; s6, judging whether the communication connection signal of the battery unit can be detected. The battery awakening method realizes soft start of the bus capacitor and reduces current impact on the bus capacitor.
Description
Technical Field
The invention belongs to the field of converters, and particularly relates to a battery awakening method of an energy storage converter.
Background
A converter, such as a photovoltaic inverter, an energy storage inverter, a mobile energy storage device, or the like, typically has an inverter unit and a battery unit inside. Because the battery unit still has certain power consumption under the standby or under-voltage protection state, the overdischarge of the battery can be caused, the safety of the battery core is affected, and the service life of the battery is reduced, the battery unit generally needs to have the standby dormancy or under-voltage dormancy function. After the battery unit is dormant, the converter firstly needs to apply certain voltage to the port of the battery unit so as to wake up the battery unit to work normally. However, the existing battery wake-up method is complex in logic and is easy to cause larger impact on bus voltage and battery units.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide an improved battery awakening method of an energy storage converter.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a battery wake-up method of an energy storage converter, comprising:
step S1, detecting a real-time voltage value of a power grid, judging whether the real-time voltage value of the power grid is within a rated value range of the power grid voltage, and if so, jumping to step S2; if not, ending the battery wake-up;
s2, controlling a pre-charging relay to be closed, so that a power grid charges a high-voltage side bus capacitor module through the pre-charging relay, a pre-charging resistor connected in series with the pre-charging relay and an inversion module;
step S3, detecting whether the voltage value of the high-voltage side bus capacitor module is in the rated value range of the high-voltage bus voltage, if so, jumping to step S4; if not, ending the battery wake-up;
s4, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, and opening the pre-charging relay;
step S5, detecting whether the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, if so, jumping to step S6; if not, ending the battery wake-up;
and S6, judging whether a communication connection signal of the battery unit can be detected, if so, waking up the battery successfully.
Preferably, step S4 specifically includes:
s41, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, wherein the pre-charging relay is opened;
and S42, performing open-loop control on the low-voltage side bus capacitor module through a bidirectional isolation module.
Further, step S42 specifically includes:
step S421, the first switch module, the second switch module, the third switch module and the fourth switch module of the bidirectional isolation module are kept disconnected;
step S422, the bidirectional isolation module controls the internal phase angle α1 to be gradually increased, so that the seventh switch module of the bidirectional isolation module is closed with respect to the fifth switch module in a delayed manner;
step S423, controlling the voltage value of the low-voltage side bus capacitor module to be smaller than the rated wake-up voltage of the battery unit.
Further, step S422 specifically includes:
step S4221, controlling the internal shift angle alpha by the bidirectional isolation module 1 The switching device comprises a first switching module, a second switching module, a third switching module and a fourth switching module, wherein the first switching module, the second switching module, the third switching module and the fourth switching module are kept in a closed state, the duty ratios of the fifth switching module, the sixth switching module, the seventh switching module and the eighth switching module are all 50%, the fifth switching module is complementary with the sixth switching module, and the seventh switching module is complementary with the eighth switching module; in the first half period of one complete period, the fifth switch module is closed, the sixth switch module is opened, in the second half period, the fifth switch module is opened, the sixth switch module is closed, and the seventh switch module is delayed by alpha relative to the fifth switch module 1 The cycle is closed.
Further, 0.ltoreq.alpha 1 ≤0.5。
Preferably, step S6 specifically includes:
step S61, if the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, performing closed-loop control on the low-voltage side bus capacitor module through a bidirectional isolation module;
step S62, judging whether the communication connection signal of the battery unit can be detected, if yes, the battery is awakened successfully.
Further, step S61 specifically includes:
step S611, if the voltage value of the low-voltage side bus capacitor module is within the rated voltage range of the low-voltage bus, single phase shift modulation is performed through the bidirectional isolation module, and the proportional-integral controller outputs the phase angle alpha of the external shift 2 The outer ring controls the voltage of the low-voltage side bus capacitor module, and the inner ring controls the inductance current of the bidirectional isolation module.
Further, step S611 specifically includes:
step S6111, if the voltage value of the low-voltage side bus capacitor module is within the rated value range of the low-voltage bus voltage, the bidirectional isolation module controls the phase angle alpha of the outward shift 2 Gradually increasing, wherein an outer ring controls the voltage of the low-voltage side bus capacitor module, and an inner ring controls the inductance current of the bidirectional isolation module; the first switch module and the fourth switch module synchronously act, and the second switch module and the third switch module synchronously act; the first switch module is complementary with the second switch module, the third switch module is complementary with the fourth switch module, and the duty ratio is 50%; the fifth switch module and the eighth switch module synchronously act, and the sixth switch module and the seventh switch module synchronously act; the fifth switch module is complementary to the sixth switch module, and the seventh switch module is complementary to the eighth switch module and is 50% duty ratio; in the first half period of a complete period, the first switch module and the fourth switch module are closed, the second switch module and the third switch module are opened, and in the second half period, the first switch module and the fourth switch module are opened, and the second switch module and the third switch module are closed; the fifth and eighth switch modules are opposite to the first and fourth switches Guan Yanchi alpha 2 The cycle is closed.
Further, -0.5. Ltoreq.alpha 2 ≤0.5。
Preferably, before step S1, the battery wake-up method further includes:
and S0, after the current transformer is electrified, detecting whether a CAN communication signal exists between the battery unit and the inverter unit, if the CAN communication signal does not exist, jumping to the step S1, otherwise ending the battery awakening.
Preferably, step S1 specifically includes: judging whether the real-time voltage value of the power grid is within the rated voltage range of the power grid in the first time period, if so, jumping to a step S2; and ending the battery wake-up if the response fails in the first time period or the real-time voltage value of the power grid is not in the rated voltage range of the power grid.
Preferably, step S3 specifically includes: detecting whether the voltage value of the high-voltage side bus capacitor module is within a high-voltage bus voltage rated value range in a second time period, if so, jumping to a step S4; and if the response fails in the second time period or the voltage value of the high-voltage side bus capacitor module is not in the high-voltage bus voltage rated value range, ending the battery wakeup.
Preferably, step S5 specifically includes: detecting whether the voltage value of the low-voltage side bus capacitor module is within a low-voltage bus voltage rated value range in a third time period, if so, jumping to a step S6; and if the response fails in the third time period or the voltage value of the low-voltage side bus capacitor module is not in the low-voltage bus voltage rated value range, ending the battery wakeup.
Preferably, step S6 specifically includes: detecting a communication connection signal of the battery unit in a fourth time period, and waking up the battery successfully; and if the response fails or the communication signal of the battery unit is not detected in the fourth time period, ending the battery wakeup.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the battery awakening method of the energy storage converter, when the battery unit is awakened, the pre-charging relay is closed, after the voltage of the high-voltage side bus capacitor module is raised to the rated value range of the high-voltage bus voltage, the alternating-current grid-connected relay is closed, the pre-charging relay is opened, so that soft start of the bus capacitor is realized, and current impact on the bus capacitor is reduced.
In a further preferred scheme, after the alternating current grid-connected relay is closed and the pre-charging relay is opened, the low-voltage side bus capacitor module is subjected to open-loop control through the bidirectional isolation module so as to realize the slow-up of the low-voltage side bus capacitor module; in the wake-up stage, double closed-loop control is adopted, the outer ring controls the voltage of the low-voltage side bus capacitor module, the inner ring controls the inductance current of the bidirectional isolation module, the problem that the charge and discharge of the battery are not controlled is effectively avoided, and the current impact in the starting process of the battery unit is also avoided.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a battery wake-up method according to an embodiment of the present invention;
FIG. 2 is a flowchart of a battery wake-up method according to an embodiment of the present invention;
FIG. 3 is a flowchart of a battery wake-up method according to an embodiment of the present invention;
FIG. 4 is a logic timing diagram of open loop control according to an embodiment of the present invention;
FIG. 5 is a logic timing diagram of closed loop control according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the connection of a battery wake-up system according to an embodiment of the present invention;
1, a battery unit; 2. an inverter unit; 3. a power grid; 4. a first bus capacitor module; 5. a bidirectional isolation module; 51. primary full bridge; 52. a secondary full bridge; 6. a second bus capacitor module; 7. an inversion module; 8. a relay module; 9. a filtering module; t (T) dab An isolation transformer; l (L) 1 DAB inductance; c (C) 1 A first bus capacitor; c (C) 2 A second bus capacitor; t (T) 1 A first switch module; t (T) 2 A second switchClosing a module; t (T) 3 A third switch module; t (T) 4 A fourth switch module; t (T) 5 A fifth switch module; t (T) 6 A sixth switch module; t (T) 7 A seventh switch module; t (T) 8 An eighth switch module; t (T) 9 A ninth switch module; t (T) 10 A tenth switch module; t (T) 11 An eleventh switch module; t (T) 12 A twelfth switching module; l (L) 2 A filter inductance; c (C) 3 A filter capacitor; r is R 1 A first precharge resistor; RY type 1 A first precharge relay; r is R 2 A second precharge resistor; RY type 2 A second precharge relay; RY type 3 The first alternating current grid-connected relay; RY type 4 And a second alternating current grid-connected relay.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 6, the embodiment discloses a battery wake-up system of an energy storage converter, which is disposed inside the converter, and the converter may be an optical storage integrated machine, a photovoltaic inverter, an energy storage inverter or a mobile energy storage device, which is not limited herein. The battery wake-up system comprises a battery unit 1 and an inverter unit 2, wherein the inverter unit 2 is respectively connected with the battery unit 1 and a power grid 3. The inverter unit 2 includes a first bus capacitor module 4 (i.e., a low-voltage side bus capacitor module), a bidirectional isolation module 5, a second bus capacitor module 6 (i.e., a high-voltage side bus capacitor module), an inverter module 7, and a relay module 8, which are sequentially connected in series. The first bus capacitor module 4 is connected with the battery unit 1, and the relay module 8 is connected with the power grid 3. Wherein the first bus capacitor module 4 comprises a first bus capacitor C 1 The second bus capacitor module 6 includes a second bus capacitor C 2 In particular to the present embodiment, C 1 Is the low-voltage side bus capacitor, C 2 Is the high-voltage side bus capacitor.
The relay module 8 comprises at least a first branch and a second branch arranged in parallel. The first branch includes a series connection of a relay resistor (i.e., a precharge resistor) and a first relay (i.e., a precharge relay). The second branch includes a second relay (i.e., an ac grid-tie relay). The relay module 8 further includes a controller (not shown in the drawings) electrically connected to the first relay and the second relay, respectively, to control opening and closing of the first relay and the second relay.
Specifically, as shown in fig. 1, the first branch circuit in this embodiment includes a first precharge branch circuit and a second precharge branch circuit connected in parallel. The first precharge branch comprises a first relay resistor R connected in series 1 And a first precharge relay RY 1 The second pre-charging branch comprises a second relay resistor R connected in series 2 And a second precharge relay RY 2 . The second branch comprises a first alternating current grid-connected branch and a second alternating current grid-connected branch which are connected in parallel. The first AC grid-connected branch comprises a first AC grid-connected relay RY 3 The second AC grid-connected branch comprises a second AC grid-connected relay RY 4 . It should be noted that, in other embodiments, the number of the precharge resistor, the precharge relay, and the ac grid-connected relay may be one or more, and is not limited herein.
The bidirectional isolation module 5 specifically comprises a double active bridge (Dual Active Bridge, DAB) circuit including a primary full bridge 51, a secondary full bridge 52, and an isolation transformer T dab And DAB inductance L 1 . Isolation transformer T dab Respectively connected with a primary full bridge 51 and a secondary full bridge 52. DAB inductor L 1 Respectively with primary full bridge 51 and isolation transformer T dab And (5) connection. Specifically, the primary full bridge 51 includes a first leg and a second leg connected in parallel. The first bridge arm comprises a first switch module T connected in series 1 And a second switch module T 2 The second bridge arm comprises a third switch module T connected in series 3 And a fourth switch module T 4 . Secondary full bridge 52 includes phasesAnd the third bridge arm and the fourth bridge arm are connected in parallel. The third bridge arm comprises a fifth switch module T connected in series 5 And a sixth switch module T 6 The fourth bridge arm comprises a seventh switch module T connected in series 7 And an eighth switch module T 8 . Isolation transformer T dab Comprises an isolation primary side and an isolation secondary side, wherein one end of the isolation primary side is connected to a third switch module T 3 And a fourth switch module T 4 One end of the isolation secondary side is connected to the fifth switch module T 5 And a sixth switch module T 6 The other end of the isolation secondary side is connected to the seventh switch module T 7 And an eighth switch module T 8 Is connected to the connecting point of (c). Wherein, the first switch module T 1 A second switch module T 2 Third switch module T 3 Fourth switch module T 4 A fifth switch module T5, a sixth switch module T6 and a seventh switch module T 7 And an eighth switch module T 8 The power switch is an insulated gate bipolar transistor or a MOS tube. DAB inductor L 1 Is connected to the first switch module T 1 And a second switch module T 2 DAB inductance L 1 And the other end of the isolation primary is connected to the other end of the isolation primary.
The inverter module 7 includes a first inverter leg and a second inverter leg connected in parallel. The first inverter bridge arm comprises a ninth switch module T connected in series 9 And a tenth switch module T 10 The second inverter bridge arm comprises an eleventh switch module T connected in series 11 And a twelfth switch module T 12 . Wherein, the ninth switch module T 9 Tenth switch module T 10 Eleventh switch module T 11 And a twelfth switch module T 12 The power switch is an insulated gate bipolar transistor or a MOS tube.
The battery wake-up system further comprises a filtering module 9. The filtering module 9 is connected in series between the inversion module 7 and the relay module 8. The filtering module 9 comprises a filtering inductance L 2 And filter capacitor C 3 . Filter inductance L 2 Is connected to the ninth switching module T 9 And tenth stepSwitch module T 10 Is connected with the filter inductance L 2 Is connected to the grid 3 at the other end. Filter capacitor C 3 Is connected to the filter inductance L 2 Connection point with the electric network 3, filter capacitor C 3 Is connected to the eleventh switch module T 11 And a twelfth switch module T 12 Is connected to the connecting point of (c).
Further, the battery wake-up system can further comprise a voltage detection module, wherein the voltage detection module comprises a power grid voltage sampling unit for detecting voltages at two sides of a power grid and a bus voltage sampling unit for collecting bus voltages, and the power grid voltage sampling unit and the bus voltage sampling unit are respectively and electrically connected with the controller.
As shown in fig. 1 to 3, the embodiment discloses a battery wake-up method of an energy storage converter, which includes:
step S1, detecting a real-time voltage value of a power grid, judging whether the real-time voltage value of the power grid is within a rated value range of the power grid voltage, and if so, jumping to step S2; if not, ending the battery wake-up;
s2, controlling the pre-charging relay to be closed, so that the power grid charges the high-voltage side bus capacitor module through the pre-charging relay, a pre-charging resistor connected with the pre-charging relay in series and the inversion module;
step S3, detecting whether the voltage value of the high-voltage side bus capacitor module is in the rated value range of the high-voltage bus voltage, if so, jumping to step S4; if not, ending the battery wake-up;
s4, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, and opening the pre-charging relay;
step S5, detecting whether the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, if so, jumping to step S6; if not, ending the battery wake-up;
and S6, judging whether a communication connection signal of the battery unit can be detected, if so, waking up the battery successfully.
Preferably, step S4 specifically includes:
s41, controlling an alternating current grid-connected relay connected with a pre-charging relay in parallel to be closed, and opening the pre-charging relay;
step S42: and the low-voltage side bus capacitor module is subjected to open-loop control through the bidirectional isolation module.
The step S42 specifically includes:
step S421, the first switch module, the second switch module, the third switch module and the fourth switch module of the bidirectional isolation module are kept disconnected;
step S422, the bidirectional isolation module controls the internal shift angle alpha 1 to be gradually increased, so that a seventh switch module of the bidirectional isolation module is closed in a delayed manner relative to a fifth switch module;
step S423, controlling the voltage value of the low-voltage side bus capacitor module to be smaller than the rated wake-up voltage of the battery unit.
The step S422 specifically includes:
step S4221, controlling the internal shift angle alpha by the bidirectional isolation module 1 The switching device comprises a first switching module, a second switching module, a third switching module and a fourth switching module, wherein the first switching module, the second switching module, the third switching module and the fourth switching module are kept in a closed state, the duty ratios of the fifth switching module, the sixth switching module, the seventh switching module and the eighth switching module are all 50%, the fifth switching module is complementary with the sixth switching module, and the seventh switching module is complementary with the eighth switching module; in the first half period of one complete period, the fifth switch module is closed, the sixth switch module is opened, in the second half period, the fifth switch module is opened, the sixth switch module is closed, and the seventh switch module is delayed by alpha relative to the fifth switch module 1 The cycle is closed. Wherein, alpha is more than or equal to 0 1 ≤0.5。
As shown in fig. 4 in detail, the solid lines in fig. 4 represent the fifth and seventh switching modules, and the broken lines represent the sixth and eighth switching modules. After the voltage of the second bus capacitor module 6 (i.e. the high-voltage side bus capacitor module) stabilizes, T 1 -T 4 Are all low level (switch module is opened), only turn on T 5 -T 8 The high-voltage side is driven to have 50 percent of duty ratio and passes through the internal shift angle alpha 1 （T 7 Relative to T 5 The opening delay of the switch-on time accounting for the whole period) is controlled in an open loop, the internal shift angle is gradually increased from 0 to the maximum value of 0.5. By variation ofThe transformer, DAB inductor and anti-parallel diode at low voltage side are used for connecting the first bus capacitor C of the first bus capacitor module 4 1 The voltage rise of (a) is up to a certain value, for example, 60V or less, which may be 48V (lower than the voltage capable of waking up the battery), so as to achieve the slow-down of the low-voltage bus voltage.
Preferably, step S6 specifically includes:
step S61, if the voltage value of the low-voltage side bus capacitor module is in the range of the rated voltage value of the low-voltage bus, performing closed-loop control on the low-voltage side bus capacitor module through the bidirectional isolation module;
step S62, judging whether the communication connection signal of the battery unit can be detected, if yes, the battery is awakened successfully.
The step S61 specifically includes:
step S611, if the voltage value of the low-voltage side bus capacitor module is within the rated value range of the low-voltage bus voltage, single phase shift modulation is performed through the bidirectional isolation module, and the proportional-integral controller outputs the phase angle alpha of the external shift 2 The outer ring controls the voltage of the low-voltage side bus capacitor module, and the inner ring controls the inductance current of the bidirectional isolation module.
Step S611 specifically includes:
step S6111, if the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, the bidirectional isolation module controls the outward shift phase angle alpha 2 Gradually increasing, wherein the outer ring controls the voltage of the low-voltage side bus capacitor module, and the inner ring controls the inductance current of the bidirectional isolation module; the first switch module and the fourth switch module synchronously act, and the second switch module and the third switch module synchronously act; the first switch module is complementary with the second switch module, the third switch module is complementary with the fourth switch module, and the duty ratio is 50%; the fifth switch module and the eighth switch module synchronously act, and the sixth switch module and the seventh switch module synchronously act; the fifth switch module is complementary to the sixth switch module, and the seventh switch module is complementary to the eighth switch module and is 50% duty ratio; the first switch module and the fourth switch module are closed in the first half period of one complete period, the second switch module and the third switch module are opened, and the first switch module is in the second half periodThe fourth switch module is opened, and the second switch module and the third switch module are closed; the fifth and eighth switch modules are opposite to the first and fourth switches Guan Yanchi alpha 2 The cycle is closed. Wherein, -0.5 is less than or equal to alpha 2 ≤0.5。
As shown in fig. 5, the solid lines in fig. 5 represent the first, fourth, fifth and eighth switch modules, and the broken lines represent the second, third, sixth and seventh switch modules. After the controller detects that the voltage value of the low-voltage bus capacitor module is in the rated value range of the low-voltage bus voltage, the controller outputs an external phase shift angle through the single phase shift angle (single phase shift, SPS) control of DAB (proportional integral controller), and the external ring control target is the first bus capacitor C 1 Is DAB inductance L in the inner loop 1 Realize the first bus capacitor C 1 Is a slow lifting of (a). The PI controller is a linear controller that forms a control deviation from a given value and an actual output value, and forms a control quantity by linearly combining the proportional and integral of the deviation, thereby controlling a controlled object.
In open loop control, open loop current is easy to be unstable, so that charging and discharging of a battery are not controlled, and therefore, after the low-voltage side bus voltage reaches a preset value, closed loop control is additionally performed before the battery wakes up, so that the voltage of a battery port is slowly lifted, the battery is activated at the lowest voltage, and current impact in the starting process of the battery is also effectively avoided. If closed loop control is directly performed, the DAB circuit is liable to be over-current.
Further, before step S1, the battery wake-up method further includes:
and S0, after the current transformer is electrified, detecting whether a CAN communication signal exists between the battery unit and the inverter unit, if the CAN communication signal does not exist, jumping to the step S1, otherwise ending the battery awakening.
The battery awakening comprises power-on awakening and remote awakening, and after the inverter is powered on by AC test, CAN communication is not detected within 30s of power-on, and then the battery awakening mode is entered. If the controller cannot detect that a CAN communication signal exists between the battery unit and the inverter unit, the power-on awakening is finished, and a user CAN remotely realize battery awakening through the APP.
Further, the step S1 specifically includes: judging whether the real-time voltage value of the power grid is within the rated voltage range of the power grid in the first time period, if so, jumping to the step S2; if the response fails in the first time period or the real-time voltage value of the power grid is not in the rated voltage range of the power grid, the battery wake-up is ended. The duration of the first time period may be 1 second, and if the response time exceeds 1 second, the battery wake-up fails. If the voltage detection module detects that the voltage across the grid 3 is greater than a preset grid voltage range value (safety parameter value), for example 230×0.8v, within a first period of time, the first precharge relay RY is closed 1 And a second precharge relay RY 2 . The mains voltage is passed through a first precharge relay RY 1 Second precharge relay RY 2 First relay resistor R 1 Second relay resistor R 2 And an anti-parallel diode arranged in the inversion module 7 charges the second bus capacitor C2, and the voltage of the bus capacitor at the high voltage side is raised in an uncontrolled rectifying mode.
Further, the step S3 specifically includes: detecting whether the voltage value of the high-voltage side bus capacitor module is within the rated value range of the high-voltage bus voltage in a second time period, if so, jumping to a step S4; and if the response fails or the voltage value of the high-voltage side bus capacitor module is not in the high-voltage bus voltage rated value range in the second time period, ending the battery wakeup. The duration of the second period may be 10 seconds, and if the response time exceeds 10 seconds, the battery wake-up fails. For example, a bus voltage greater than Vgrid x 1.414-20V (grid voltage effective multiplied by root number 2 minus 20V, e.g., 310V) is detected during the second period, closing the first ac grid-tied relay RY 3 Second AC grid-connected relay RY 4 The first precharge relay RY is turned off 1 Second precharge relay RY 2 In this way, the impact of the grid voltage on the second bus capacitor module 6 can be effectively reduced.
Further, the step S5 specifically includes: detecting whether the voltage value of the low-voltage side bus capacitor module is within the low-voltage bus voltage rated value range in a third time period, if so, jumping to a step S6; and if the response fails or the voltage value of the low-voltage side bus capacitor module is not in the low-voltage bus voltage rated value range in the third time period, ending the battery wakeup. Wherein the duration of the third time period may be 5 seconds. For example, the low-voltage bus voltage rating may be below 60V, and may specifically be 48V (below the voltage at which the battery can be awakened), to achieve a slow-down of the low-voltage bus voltage.
Further, the step S6 specifically includes: detecting a communication connection signal of the battery unit in a fourth time period, and waking up the battery successfully; if the response fails or the communication signal of the battery unit is not detected in the fourth time period, the battery wakeup is ended. Wherein the duration of the fourth period of time may be 30 seconds.
In summary, the battery wake-up method and system in the embodiment have the following advantages:
1. when the battery unit is awakened, the pre-charging relay is firstly closed, after the voltage of the high-voltage side bus capacitor module is raised to the rated value range of the high-voltage bus voltage, the alternating-current grid-connected relay is closed, and the pre-charging relay is opened, so that the soft start of the bus capacitor is realized, and the current impact on the bus capacitor is reduced;
2. after the alternating current grid-connected relay is closed and the precharge relay is opened, the low-voltage side bus capacitor module is subjected to open-loop control through the bidirectional isolation module, so that the slow-starting of the low-voltage side bus capacitor module is realized; in the wake-up stage, double closed-loop control is adopted, the outer ring controls the voltage of the low-voltage side bus capacitor module, the inner ring controls the inductance current of the bidirectional isolation module, the problem that the charge and discharge of the battery are not controlled is effectively avoided, and the current impact in the starting process of the battery unit is also avoided;
3. lifting the voltage of the high-voltage side bus capacitor in an uncontrolled rectifying mode, and adopting an open loop control and outer loop control combined mode to finish the slow lifting and lifting of the low-voltage side bus voltage, so that the problems of unidirectional magnetic saturation and uncontrolled battery charging and discharging can be effectively avoided, the overcurrent of a DAB circuit is also prevented, and the slow lifting of the voltage is realized;
4. the battery awakening system is simple in structure, can be arranged in the converter, achieves miniaturization of the converter, and reduces cost.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present invention are merely with respect to the mutual positional relationship of the constituent elements of the present invention in the drawings.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention. All equivalent changes or modifications made according to the principles of the present invention should be construed to be included within the scope of the present invention.
Claims (14)
1. A method for waking up a battery of an energy storage converter, comprising:
step S1, detecting a real-time voltage value of a power grid, judging whether the real-time voltage value of the power grid is within a rated value range of the power grid voltage, and if so, jumping to step S2; if not, ending the battery wake-up;
s2, controlling a pre-charging relay to be closed, so that a power grid charges a high-voltage side bus capacitor module through the pre-charging relay, a pre-charging resistor connected in series with the pre-charging relay and an inversion module;
step S3, detecting whether the voltage value of the high-voltage side bus capacitor module is in the rated value range of the high-voltage bus voltage, if so, jumping to step S4; if not, ending the battery wake-up;
s4, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, and opening the pre-charging relay;
step S5, detecting whether the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, if so, jumping to step S6; if not, ending the battery wake-up;
and S6, judging whether a communication connection signal of the battery unit can be detected, if so, waking up the battery successfully.
2. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S4 specifically comprises:
s41, controlling an alternating current grid-connected relay connected with the pre-charging relay in parallel to be closed, wherein the pre-charging relay is opened;
and S42, performing open-loop control on the low-voltage side bus capacitor module through a bidirectional isolation module.
3. The method for waking up a battery of an energy storage converter according to claim 2, wherein step S42 specifically includes:
step S421, the first switch module, the second switch module, the third switch module and the fourth switch module of the bidirectional isolation module are kept disconnected;
step S422, the bidirectional isolation module controls the internal phase angle alpha 1 Gradually increasing, so that a seventh switch module of the bidirectional isolation module is closed in a time delay manner relative to a fifth switch module;
step S423, controlling the voltage value of the low-voltage side bus capacitor module to be smaller than the rated wake-up voltage of the battery unit.
4. A method for waking up a battery of an energy storage converter according to claim 3, wherein step S422 specifically comprises:
step S4221, said bidirectional isolationModule controlled internal shift angle alpha 1 The switching device comprises a first switching module, a second switching module, a third switching module and a fourth switching module, wherein the first switching module, the second switching module, the third switching module and the fourth switching module are kept in a closed state, the duty ratios of the fifth switching module, the sixth switching module, the seventh switching module and the eighth switching module are all 50%, the fifth switching module is complementary with the sixth switching module, and the seventh switching module is complementary with the eighth switching module; in the first half period of one complete period, the fifth switch module is closed, the sixth switch module is opened, in the second half period, the fifth switch module is opened, the sixth switch module is closed, and the seventh switch module is delayed by alpha relative to the fifth switch module 1 The cycle is closed.
5. The method for waking up a battery of an energy storage converter according to claim 4, wherein 0.ltoreq.α 1 ≤0.5。
6. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S6 specifically comprises:
step S61, if the voltage value of the low-voltage side bus capacitor module is in the low-voltage bus voltage rated value range, performing closed-loop control on the low-voltage side bus capacitor module through a bidirectional isolation module;
step S62, judging whether the communication connection signal of the battery unit can be detected, if yes, the battery is awakened successfully.
7. The method for waking up a battery of an energy storage converter as claimed in claim 6, wherein the step S61 specifically includes:
step S611, if the voltage value of the low-voltage side bus capacitor module is within the rated voltage range of the low-voltage bus, single phase shift modulation is performed through the bidirectional isolation module, and the proportional-integral controller outputs the phase angle alpha of the external shift 2 The outer ring controls the voltage of the low-voltage side bus capacitor module, and the inner ring controls the inductance current of the bidirectional isolation module.
8. The method for waking up a battery of an energy storage converter according to claim 7, wherein step S611 specifically includes:
step S6111, if the voltage value of the low-voltage side bus capacitor module is within the rated value range of the low-voltage bus voltage, the bidirectional isolation module controls the phase angle alpha of the outward shift 2 Gradually increasing, wherein an outer ring controls the voltage of the low-voltage side bus capacitor module, and an inner ring controls the inductance current of the bidirectional isolation module; the first switch module and the fourth switch module synchronously act, and the second switch module and the third switch module synchronously act; the first switch module is complementary with the second switch module, the third switch module is complementary with the fourth switch module, and the duty ratio is 50%; the fifth switch module and the eighth switch module synchronously act, and the sixth switch module and the seventh switch module synchronously act; the fifth switch module is complementary to the sixth switch module, and the seventh switch module is complementary to the eighth switch module and is 50% duty ratio; in the first half period of a complete period, the first switch module and the fourth switch module are closed, the second switch module and the third switch module are opened, and in the second half period, the first switch module and the fourth switch module are opened, and the second switch module and the third switch module are closed; the fifth and eighth switch modules are opposite to the first and fourth switches Guan Yanchi alpha 2 The cycle is closed.
9. The method for waking up a battery of an energy storage converter according to claim 8, wherein, -0.5 is equal to or less than α 2 ≤0.5。
10. The battery wake-up method of an energy storage converter of claim 1, wherein prior to step S1, the battery wake-up method further comprises:
and S0, after the current transformer is electrified, detecting whether a CAN communication signal exists between the battery unit and the inverter unit, if the CAN communication signal does not exist, jumping to the step S1, otherwise ending the battery awakening.
11. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S1 specifically comprises: judging whether the real-time voltage value of the power grid is within the rated voltage range of the power grid in the first time period, if so, jumping to a step S2; and ending the battery wake-up if the response fails in the first time period or the real-time voltage value of the power grid is not in the rated voltage range of the power grid.
12. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S3 specifically comprises: detecting whether the voltage value of the high-voltage side bus capacitor module is within a high-voltage bus voltage rated value range in a second time period, if so, jumping to a step S4; and if the response fails in the second time period or the voltage value of the high-voltage side bus capacitor module is not in the high-voltage bus voltage rated value range, ending the battery wakeup.
13. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S5 specifically comprises: detecting whether the voltage value of the low-voltage side bus capacitor module is within a low-voltage bus voltage rated value range in a third time period, if so, jumping to a step S6; and if the response fails in the third time period or the voltage value of the low-voltage side bus capacitor module is not in the low-voltage bus voltage rated value range, ending the battery wakeup.
14. The method for waking up a battery of an energy storage converter according to claim 1, wherein step S6 specifically comprises: detecting a communication connection signal of the battery unit in a fourth time period, and waking up the battery successfully; and if the response fails or the communication signal of the battery unit is not detected in the fourth time period, ending the battery wakeup.
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| CN116599337A (en) * | 2023-05-09 | 2023-08-15 | 合肥工业大学 | Cascade starting method of medium-voltage power electronic transformer |
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| CN107910892A (en) * | 2017-11-15 | 2018-04-13 | 国家电网公司 | A kind of energy router apparatus applied to intelligent distributed energy network |
| CN108377094A (en) * | 2018-04-09 | 2018-08-07 | 西安工业大学 | A kind of dead zone adjustment control method being suitable for double active bridge soft starts |
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