CN108631347A - The soft-start method and device of energy feedback type charging/discharging apparatus - Google Patents
The soft-start method and device of energy feedback type charging/discharging apparatus Download PDFInfo
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- CN108631347A CN108631347A CN201810411720.5A CN201810411720A CN108631347A CN 108631347 A CN108631347 A CN 108631347A CN 201810411720 A CN201810411720 A CN 201810411720A CN 108631347 A CN108631347 A CN 108631347A
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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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Abstract
The present invention relates to a kind of soft-start method and device of energy feedback type charging/discharging apparatus, the method includes：It drives the first exchange side soft-start module to be closed, host busbar voltage is charged to alternating current peak value in advance；Close the first exchange side soft-start module, and preliminary filling the first bus capacitor module；Judge whether the difference between the voltage and line voltage of the first bus capacitor module is less than preset voltage value；If so, the first grid-connected relay module of driving and the first DC side soft-start module are closed and complete host soft start.The embodiment of the present invention by first drive the first exchange side soft-start module be closed with by host busbar voltage in advance to alternating current peak value, then the first bus capacitor module is charged to line voltage in advance, it recloses the first grid-connected relay module and the progress of the first DC side soft-start module is grid-connected, it avoids causing heavy current impact to each component in inverter when grid-connected, the service life for the internal components that can effectively extend in inverter is to extend the service life of inverter.
Description
Technical field
The present invention relates to inverter technology field, more particularly to a kind of soft-start method of energy feedback type charging/discharging apparatus
And device.
Background technology
AC-DC conversion may be implemented by the electric energy of power grid using Bidirectional variable-flow technology in energy feedback type charging/discharging apparatus
It is charged in battery pack, the electricity released in battery pack can also be fed back in the form of parallel network reverse in power grid, keep the part electric
It can obtain cycling and reutilization.
Energy feedback type charging/discharging apparatus is mainly (real by DC-DC module (realizing direct current stepping functions) and AC-DC module
Existing rectification and inversion function) composition system, modularized design supports multiple module paralleling to use.
After energy feedback type charging/discharging apparatus connects alternating current, AC-DC module needs Auto Power On, and DC-DC module then by
Host computer and middle-position machine control switching on and shutting down.Therefore the soft-start mode of AC-DC module becomes to be even more important.Due to AC-DC module
Inside has used a large amount of dc-link capacitance and has exchanged output filter capacitor, in order to reduce grid-connected moment to grid-connected switch, electricity
The rush of current of net and capacitance, the general method for using series resistance current limliting soft start.
Currently, the soft mode opened have DC side it is soft open with soft two kinds of exchange side, but the mode of DC side soft start need
Special increasing apparatus is established in DC side, system constructions cost is higher；And the mode of exchange side soft start is only simple
By establishing certain voltage on bus capacitor, there is larger mistake in voltage-phase amplitude with the alternating voltage of grid side
Difference can still cause larger grid-connected impact, reduce the service life of inverter so during grid-connected.
Invention content
The technical problem to be solved in the present invention be for the above-mentioned prior art in shortcoming, a kind of energy is provided and is returned
The soft-start method and device of feedback type charging/discharging apparatus.
The present invention solves the technological means that technical problem uses and is to provide a kind of the soft of energy feedback type charging/discharging apparatus to open
Dynamic method, is applied in the soft starting circuit of energy feedback type charging/discharging apparatus, including host soft starting circuit and several slaves
Soft starting circuit, the host soft starting circuit include sequentially connected first exchange side soft-start module, the first grid-connected relay
Device module, the first bus capacitor module, the first power switching modules and the first DC side soft-start module, first exchange
Side soft-start module is connect with power grid, and the first DC side soft-start module is connected with direct current input, including：
It drives the first exchange side soft-start module to be closed, host busbar voltage is charged to alternating current peak value in advance；
Close the first exchange side soft-start module, and the first bus capacitor module described in preliminary filling；
Judge whether the difference between the voltage and line voltage of the first bus capacitor module is less than preset voltage value；
If so, the first grid-connected relay module of driving and the first DC side soft-start module closure are completed, host is soft to be opened
It is dynamic.
Further, the slave soft starting circuit include sequentially connected second exchange side soft-start module, second simultaneously
Network relay module, the second bus capacitor module, the second power switching modules and the second DC side soft-start module, described
Two exchange side soft-start modules are connect with power grid, and the second DC side soft-start module is connected with direct current input；The driving
First grid-connected relay module and the first DC side soft-start module further include after being closed the step of completing host soft start：
The second exchange side soft-start module is driven to be closed, slave busbar voltage described in preliminary filling is equal to host busbar electricity
Pressure；
The second exchange side soft-start module is closed, the second DC side soft-start module, and the second busbar of preliminary filling are closed
Capacitance module；
Judge whether the difference between the voltage and line voltage of the second bus capacitor module is less than the default electricity
Pressure value；
If so, being closed the second grid-connected relay module completes slave soft start.
Further, the first bus capacitor module described in the preliminary filling specifically includes：
Drive the first power switching modules to send out PWM wave to the first bus capacitor module, to the first bus capacitor module by
No-voltage starts to charge up；
Alternating voltage identical with the line voltage characteristic of power grid is established in the first bus capacitor module.
Further, described that alternating current identical with the line voltage characteristic of power grid is established in the first bus capacitor module
Briquetting includes：
The first alternating voltage, the line voltage of first alternating voltage and power grid are established in the first bus capacitor module
Between difference be less than preset voltage value, and first alternating voltage is identical with the phase of line voltage.
Further, the second bus capacitor of preliminary filling module specifically includes：
Drive the second power switching modules to send out PWM wave to the second bus capacitor module, to the second bus capacitor module by
No-voltage starts to charge up；
The second alternating voltage with amplitude same-phase with the line voltage of power grid is established in the second bus capacitor module.
On the other hand, the present invention also provides a kind of soft starting devices of energy feedback type charging/discharging apparatus, including：
First exchange preliminary filling unit, for driving the first exchange side soft-start module to be closed, by host busbar voltage preliminary filling
To alternating current peak value；
First capacitance preliminary filling unit, for closing the first exchange side soft-start module, and the first bus capacitor described in preliminary filling
Module；
First judging unit, the difference between voltage and line voltage for judging the first bus capacitor module are
It is no to be less than preset voltage value；
First soft control unit, for when first judging unit is judged as YES, driving first and network relay
Module and the first DC side soft-start module, which are closed, completes host soft start.
Further, further include：
Second exchange preliminary filling unit, for driving the second exchange side soft-start module to be closed, slave busbar electricity described in preliminary filling
Pressure is equal to the host busbar voltage；
Second capacitance preliminary filling unit is closed that the second DC side is soft to be opened for closing the second exchange side soft-start module
Dynamic model block, and preliminary filling the second bus capacitor module；
Second judgment unit, the difference between voltage and line voltage for judging the second bus capacitor module are
It is no to be less than the preset voltage value；
Second soft control unit is closed the second grid-connected relay if for when the second judgment unit is judged as
Device module completes slave soft start.
Further, the first capacitance preliminary filling unit includes：
First preliminary filling module, for driving the first power switching modules to send out PWM wave to the first bus capacitor module, to the
One bus capacitor module is started to charge up by no-voltage；
First preliminary filling keeps module, identical as the line voltage characteristic of power grid for being established in the first bus capacitor module
Alternating voltage.
Further, the first preliminary filling holding module includes：
First voltage keeps submodule, for establishing the first alternating voltage in the first bus capacitor module, described first
Difference between alternating voltage and the line voltage of power grid is less than preset voltage value, and first alternating voltage and line voltage
Phase it is identical.
Further, the second capacitance preliminary filling unit includes：
Second preliminary filling module, for driving the second power switching modules to send out PWM wave to the second bus capacitor module, to the
Two bus capacitor modules are started to charge up by no-voltage；
Second preliminary filling keeps module, same with amplitude with the line voltage of power grid for being established in the second bus capacitor module
Second alternating voltage of phase.
Using above-mentioned technical proposal, the present invention at least has the advantages that：The embodiment of the present invention is by first driving
One exchange side soft-start module be closed with by host busbar voltage in advance to alternating current peak value, then by the electricity of the first bus capacitor module
Pressure value is charged to the difference between line voltage and is less than the preset voltage value in advance, recloses the first grid-connected relay module and the
The progress of one DC side soft-start module is grid-connected, avoids causing heavy current impact, energy to each component in inverter when grid-connected
Effectively extend the service life of the internal components in inverter to extend the service life of inverter.
Description of the drawings
Fig. 1 is the flow diagram of soft-start method one embodiment of energy feedback type charging/discharging apparatus of the present invention.
Fig. 2 is the flow diagram of another embodiment of the soft-start method of energy feedback type charging/discharging apparatus of the present invention.
Fig. 3 is the detailed process of soft-start method one embodiment step S2 of energy feedback type charging/discharging apparatus of the present invention
Schematic diagram.
Fig. 4 is the detailed process of soft-start method one embodiment step S6 of energy feedback type charging/discharging apparatus of the present invention
Schematic diagram.
Fig. 5 is the block diagram of soft starting device one embodiment of energy feedback type charging/discharging apparatus of the present invention.
Fig. 6 is the block diagram of another embodiment of the soft starting device of energy feedback type charging/discharging apparatus of the present invention.
Fig. 7 is the specific box signal of soft starting device one embodiment of energy feedback type charging/discharging apparatus of the present invention
Figure.
Fig. 8 is the host soft starting circuit of soft-start method one embodiment of energy feedback type charging/discharging apparatus of the present invention
Electrical block diagram.
Fig. 9 be soft-start method one embodiment of energy feedback type charging/discharging apparatus of the present invention host and slave and
Machine schematic diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It please refers to Fig.1 to Fig. 9, the present invention provides a kind of soft-start method of energy feedback type charging/discharging apparatus, is applied to
In the soft starting circuit of energy feedback type charging/discharging apparatus, including host soft starting circuit and several slave soft starting circuits, institute
It includes sequentially connected first exchange side soft-start module, the first grid-connected relay module, the first mother to state host soft starting circuit
Line capacitance module, the first power switching modules and the first DC side soft-start module, the first exchange side soft-start module
It being connect with power grid, the first DC side soft-start module is connected with direct current input, the method includes：
Step S1, the first exchange side soft-start module of driving are closed, and host busbar voltage is charged to alternating current peak value in advance；
Step S2 closes the first exchange side soft-start module, and the first bus capacitor module described in preliminary filling；
It is default to judge whether the difference between the voltage and line voltage of the first bus capacitor module is less than by step S3
Voltage value；
Step S4, if so, the first grid-connected relay module of driving and the first DC side soft-start module are closed and complete master
Machine soft start.
When implementing, as can be seen from figures 8 and 9, the first exchange side soft-start module includes the first preliminary filling relay
RY4_1, the second preliminary filling relay RY4_2, the first mains terminal V1, the second mains terminal V2, third mains terminal V3 and ground terminal VN,
The first mains terminal V1, the second mains terminal V2, third mains terminal V3 are alternating current three-phase input end；The first preliminary filling relay
The input terminal of RY4_1 is respectively connected to the first diode D1, the second diode D2 and third diode D3 by first resistor R1
Cathode, the anode of the first diode D1 is connected to the first mains terminal V1 by the first fuse F1, described second
The anode of diode D2 is connected to the second mains terminal V2 by the second fuse F2, and the anode of the third diode D3 is logical
It crosses third fuse F3 and is connected to the third mains terminal V3；The input terminal of the second preliminary filling relay RY4_2 passes through second
Resistance R2 is respectively connected to the anode of the 4th diode D4, the 5th diode D5 and the 6th diode D6, the 4th diode
The cathode of D4 is connected to the anode of the first diode D1, and the cathode of the 5th diode D5 is connected to the two or two pole
The anode of pipe D2, the cathode of the 6th diode D6 are connected to the anode of the third diode D3.
The first grid-connected relay module include first and network relay RY1, second and network relay RY2 and third simultaneously
The input terminal of network relay RY3, described first and network relay RY1 are connected to the anode of the first diode D1, and described the
The input terminal of two and network relay RY2 is connected to the anode of the second diode D2, and the third and network relay RY3's is defeated
Enter the anode that end is connected to the third diode D3.
The first bus capacitor module includes the first capacitance C1, the second capacitance C2 and third capacitance C3, first electricity
Hold the one end C1 and be divided into two-way, is connected to the output end of described first and network relay RY1, another way by the first inductance L1 all the way
It is connected to the first signal end X1 by the second inductance L2；Described one end second capacitance C2 is divided into two-way, passes through third inductance all the way
L3 is connected to the output end of described second and network relay RY2, and another way is connected to second signal end X2 by the 4th inductance L4；
One end of the third capacitance C3 is divided into two-way, is connected to the third and network relay RY3 by the 5th inductance L5 all the way
Output end, another way are connected to third signal end X3 by the 6th inductance L6；The other end, the second capacitance of the first capacitance C1
The other end of C2 and the other end of third capacitance C3 are connected to the ground terminal VN.
First power switching modules include the first IGBT pipes Q1, the 2nd IGBT pipes Q2 and the 3rd IGBT pipe Q3, described
Drain electrode, the drain electrode of the 2nd IGBT pipes Q2 and the drain electrode of the 3rd IGBT pipes Q3 of first IGBT pipes Q1 is connected to first preliminary filling
The output end of relay RY4_1, the source electrode of the first IGBT pipes Q1 are connected to the drain electrode of the 4th IGBT pipes Q4, and described second
The source electrode of IGBT pipes Q2 is connected to the drain electrode of the 5th IGBT pipes Q5, and the source electrode of the 3rd IGBT pipes Q3 is connected to the 6th IGBT pipes
The source electrode of the drain electrode of Q6, the 4th IGBT pipes Q4 is connected to the drain electrode of the 7th IGBT pipes Q7, the source of the 5th IGBT pipes Q5
Pole is connected to the drain electrode of the 8th IGBT pipes Q8, and the source electrode of the 6th IGBT pipes Q6 is connected to the drain electrode of the 9th IGBT pipes Q9, institute
The source electrode for stating the 7th IGBT pipes Q7 is connected to the drain electrode of the tenth IGBT pipes Q10, and the source electrode of the 8th IGBT pipes Q8 is connected to
The drain electrode of 11 IGBT pipes Q11, the source electrode of the 9th IGBT pipes Q9 are connected to the drain electrode of the 12nd IGBT pipes Q12, and described
Source electrode, the source electrode of the 11st IGBT pipes Q11 and the source electrode of the 12nd IGBT pipes Q12 of ten IGBT pipes Q10 is connected to described
The output end of second preliminary filling relay RY4_2；The source electrode of the 7th IGBT pipes Q7 passes sequentially through the seven or two pole of forward conduction
Pipe D7 and the 8th diode D8 is connected to the source electrode of the first IGBT pipes Q1, and the source electrode of the 8th IGBT pipes Q8 passes sequentially through
9th diode D9 of forward conduction and the tenth diode D10 is connected to the source electrode of the 2nd IGBT pipes Q2, and the described 9th
The 11st diode D11 and the 12nd diode D12 that the source electrode of IGBT pipes Q9 passes sequentially through forward conduction are connected to described
The source electrode of three IGBT pipes Q3；The source electrode of the 4th IGBT pipes Q4 is connected to the first signal end X1, the 5th IGBT pipes
The source electrode of Q5 is connected to the second signal end X2, and the source electrode of the 6th IGBT pipes Q6 is connected to the third signal end X3,
Cathode, the cathode of the 9th diode D9 and the cathode of the 11st diode D11 of the 7th diode D7 is connected to described
The drain electrode of ground terminal VN, the first IGBT pipes Q1 are also connected to the ground terminal VN by the 4th capacitance C4, and the described tenth
The source electrode of IGBT pipes Q10 is also connected to the ground terminal VN, the grid of the first IGBT pipes Q1, second by the 5th capacitance C5
The grid of IGBT pipes Q2, the grid of the 3rd IGBT pipes Q3, the grid of the 4th IGBT pipes Q4, the grid of the 5th IGBT pipes Q5, the 6th
The grid of IGBT pipes Q6, the grid of the 7th IGBT pipes Q7, the grid of the 8th IGBT pipes Q8, the grid of the 9th IGBT pipes Q9, the tenth
The grid of the grid of IGBT pipes Q10, the grid of the 11st IGBT pipes Q11 and the 12nd IGBT pipes Q12 is connected to main control chip
The output end of (not shown).
The first DC side soft-start module includes third preliminary filling relay RY4_3 and the 4th preliminary filling relay RY4_4,
The input terminal of the third preliminary filling relay RY4_3 is connected to direct current input positive terminal BUS+, the preliminary filling by 3rd resistor R3
The output end of relay RY4_3 is connected to the output end and bus input positive terminal BUS_DP of the first busbar main relay RY6 simultaneously
+, the input terminal of the first busbar main relay RY6 be connected to simultaneously the first preliminary filling relay RY4_1 output end and
The direct current input positive terminal BUS+；The input terminal of the 4th preliminary filling relay RY4_4 is connected to direct current by the 4th resistance R4
The output end of input negative terminal BUS-, the 4th preliminary filling relay RY4_4 are connected to the defeated of the second busbar main relay RY7 simultaneously
It is pre- that the input terminal of outlet and bus input negative terminal BUS_DP-, the second busbar main relay RY7 are connected to described second simultaneously
Fill the output end of relay RY4_2 and the direct current input negative terminal BUS-.
Specifically, pass through the first mains terminal V1, the second mains terminal V2, third mains terminal V3 and ground terminal VN listings
Electricity, is closed the first preliminary filling relay RY4_1 and the second preliminary filling relay RY4_2, preliminary filling busbar voltage work as busbar to alternating current peak value
When voltage is equal to alternating current peak value, the first preliminary filling relay RY4_1 and the second preliminary filling relay RY4_2 is closed, main control chip is passed through
Open the PWM of the first power switching modules, preliminary filling the first bus capacitor mould the first capacitance C1 in the block, the second capacitance C2 and third
Capacitance C3, the first capacitance C1, the second capacitance C2 and third capacitance C3 are ac filter capacitance, when the first capacitance C1,
The phase of second capacitance C2 and third capacitance C3 and the same phase of alternating current, and the first capacitance C1, the second capacitance C2 and third capacitance
When the output value between the voltage magnitude of C3 and the alternating voltage of line voltage is less than preset voltage value, be closed described first it is grid-connected after
Then first and network relay RY1 in electrical appliance module, second and network relay RY2 and third and network relay RY3 are closed the
Third preliminary filling relay RY4_3 in one DC side soft-start module and the 4th preliminary filling relay RY4_4, then disconnect third preliminary filling
Relay RY4_3 and the 4th preliminary filling relay RY4_4, is closed at the first busbar main relay RY6 and the main relay of the second busbar
Device RY7 completes host soft start.
The present embodiment by first drive the first exchange side soft-start module be closed with by host busbar voltage in advance to alternating current peak
Then the voltage value of first bus capacitor module is charged to the difference between line voltage and is less than the predeterminated voltage by value in advance
Value, recloses the first grid-connected relay module and the progress of the first DC side soft-start module is grid-connected, avoids when grid-connected to inversion
Each component in device causes heavy current impact, and the service life for the internal components that can effectively extend in inverter is inverse to extend
Become the service life of device.
In one alternate embodiment, the slave soft starting circuit includes sequentially connected second exchange side soft start mould
Block, the second grid-connected relay module, the second bus capacitor module, the second power switching modules and the second DC side soft start mould
Block, the second exchange side soft-start module are connect with power grid, and the second DC side soft-start module is connected with direct current input；
The first grid-connected relay module of the driving and the first DC side soft-start module are closed after the step of completing host soft start
Further include：
Step S5, the second exchange side soft-start module of driving are closed, and slave busbar voltage described in preliminary filling is equal to the host
Busbar voltage；
Step S6 closes the second exchange side soft-start module, is closed the second DC side soft-start module, and preliminary filling the
Two bus capacitor modules；
It is described to judge whether the difference between the voltage and line voltage of the second bus capacitor module is less than by step S7
Preset voltage value；
Step S8, if so, being closed the second grid-connected relay module completes slave soft start.
Specifically, the slave soft starting circuit and above-mentioned host soft starting circuit are just the same, as shown in figure 9, main
Machine and multiple slaves are electrically connected with city, and in the direct current input positive terminal BUS+ and slave soft starting circuit in host soft starting circuit
The BUS+ connections of direct current input positive terminal, the direct current input negative terminal BUS- in the host soft starting circuit and slave soft starting circuit
In the BUS- connections of direct current input negative terminal, after completing host soft start, be closed slave soft starting circuit in third preliminary filling after
Electric appliance RY4_3 and the 4th preliminary filling relay RY4_4 disconnects that slave is soft opens after slave busbar voltage is equal to host busbar voltage
Third preliminary filling relay RY4_3 and the 4th preliminary filling relay RY4_4 in dynamic circuit, are closed in slave soft starting circuit
First busbar main relay RY6 and the second busbar main relay RY7, the second power switching modules in slave soft starting circuit are opened
Open the PWM of inverter bridge, the first capacitance C1, the second capacitance C2 and third capacitance C3 in preliminary filling slave, when the first capacitance C1 in slave,
After the phase and amplitude of second capacitance C2 and third capacitance C3 are identical as alternating current, first be closed in slave soft starting circuit is grid-connected
Relay RY1, second and network relay RY2 and third and network relay RY3, complete the soft start of slave.
The present embodiment can effectively avoid the big electricity to slave by realizing slave soft start again after the completion of host soft start
The problem of stream impact, extend the service life of inverter internal device.
In one alternate embodiment, as shown in figure 3, the first bus capacitor module described in the preliminary filling specifically includes：
Step S21, the first power switching modules of driving send out PWM wave to the first bus capacitor module, to the first busbar electricity
Molar block is started to charge up by no-voltage；
Step S22 establishes alternating voltage identical with the line voltage characteristic of power grid in the first bus capacitor module.
It is described that alternating current identical with the line voltage characteristic of power grid is established in the first bus capacitor module when implementing
Briquetting includes：
Step S221 establishes the first alternating voltage, first alternating voltage and power grid in the first bus capacitor module
Line voltage between difference be less than preset voltage value, and first alternating voltage is identical with the phase of line voltage.
When implementing, the PWM of the first power switching modules is opened by main control chip, in preliminary filling the first bus capacitor module
The first capacitance C1, the second capacitance C2 and third capacitance C3 so that the phase of the voltage and line voltage of the first bus capacitor module
Position identical and amplitude it is equal to avoid it is grid-connected when heavy current impact, improve safety.
In one alternate embodiment, as shown in figure 4, the preliminary filling the second bus capacitor module specifically includes：
Step S61, the second power switching modules of driving send out PWM wave to the second bus capacitor module, to the second busbar electricity
Molar block is started to charge up by no-voltage；
Step S62 is established in the second bus capacitor module and is handed over the second of amplitude same-phase with the line voltage of power grid
Galvanic electricity pressure.
Specifically, during realizing slave soft start after completing host soft start, pass through the second power switching modules
Send out PWM wave realize the second bus capacitor module preliminary filling, and by the second alternating voltage of the second bus capacitor mould be charged in advance with
Line voltage phase is identical and amplitude is equal, to avoid heavy current impact when grid-connected, prolongs the service life.
On the other hand, as shown in Figures 5 to 7, the present invention also provides a kind of soft starts of energy feedback type charging/discharging apparatus
Device, including：
First exchange preliminary filling unit 1, for driving the first exchange side soft-start module to be closed, by host busbar voltage preliminary filling
To alternating current peak value；
First capacitance preliminary filling unit 2, for closing the first exchange side soft-start module, and the first bus capacitor described in preliminary filling
Module；
First judging unit 3, the difference between voltage and line voltage for judging the first bus capacitor module
Whether preset voltage value is less than；
First soft control unit 4, for when first judging unit is judged as YES, driving first and network relay
Module and the first DC side soft-start module, which are closed, completes host soft start.
In one alternate embodiment, the first capacitance preliminary filling unit 1 includes：
First preliminary filling module 11 is right for driving the first power switching modules to send out PWM wave to the first bus capacitor module
First bus capacitor module is started to charge up by no-voltage；
First preliminary filling keeps module 12, for establishing the line voltage characteristic phase with power grid in the first bus capacitor module
Same alternating voltage.
Specifically, the first preliminary filling holding module 12 includes：
First voltage keeps submodule 121, for establishing the first alternating voltage in the first bus capacitor module, described the
Difference between one alternating voltage and the line voltage of power grid is less than preset voltage value, and first alternating voltage and alternating current electricity
The phase of pressure is identical.
When implementing, the first exchange side soft-start module is controlled by the first exchange preliminary filling unit 1 and is closed with preliminary filling host
Busbar closes the first exchange side soft start when host busbar voltage is charged to alternating current peak value in advance by the first capacitance preliminary filling unit 2
Module, preliminary filling the first bus capacitor module, then test by the first judging unit 3 voltage of the first bus capacitor module and be
It is no to be equal or close to line voltage value, if so, driving the first grid-connected relay module and the by first soft control unit 4
One DC side soft-start module is closed, and completes host soft start.By first by the first bus capacitor mould each filter capacitor in the block
It is charged to line voltage in advance, heavy current impact is caused to each component in inverter to avoid when grid-connected, is prolonged the service life.
In one alternate embodiment, further include：
Second exchange preliminary filling unit 5, for driving the second exchange side soft-start module to be closed, slave busbar electricity described in preliminary filling
Pressure is equal to the host busbar voltage；
Second capacitance preliminary filling unit 6 is closed that the second DC side is soft to be opened for closing the second exchange side soft-start module
Dynamic model block, and preliminary filling the second bus capacitor module；
Second judgment unit 7, the difference between voltage and line voltage for judging the second bus capacitor module
Whether the preset voltage value is less than；
Second soft control unit 8 is closed the second grid-connected relay if for when the second judgment unit is judged as
Device module completes slave soft start.
Specifically, the second capacitance preliminary filling unit 6 includes：
Second preliminary filling module 61 is right for driving the second power switching modules to send out PWM wave to the second bus capacitor module
Second bus capacitor module is started to charge up by no-voltage；
Second preliminary filling keeps module 62, for establishing the same amplitude of line voltage with power grid in the second bus capacitor module
Second alternating voltage of same-phase.
When implementing, the first exchange preliminary filling unit 1, the first capacitance preliminary filling unit 2, the first judging unit 3 and first
Soft control unit 4 is applied in host, and the second exchange preliminary filling unit 5, the second capacitance preliminary filling unit 6, second judge single
Member 7 and second soft control unit 8 are applied in slave, wherein the second exchange preliminary filling unit 5, the second capacitance preliminary filling list
Member 6, second judgment unit 7 exchange preliminary filling unit 1, the first capacitance preliminary filling unit with second soft control unit 8 with described first
2, the first judging unit 3 and first soft control unit 4 correspond, pre- by the second exchange after completing host soft start
Filling unit 5 drives the second exchange side soft-start module to be closed, and slave busbar voltage described in preliminary filling is equal to the host busbar voltage
Afterwards, the second exchange side soft-start module is disconnected by the second capacitance preliminary filling unit 6 and is closed the second DC side soft start mould
Block, preliminary filling the second bus capacitor mould ac filter capacitance in the block, when second judgment unit 7 monitors second bus capacitor
When the voltage of module is equal or close to line voltage, it is complete that the second grid-connected relay module is closed by second soft control unit 8
At slave soft start.In slave soft start, the second bus capacitor mould each ac filter capacitance in the block in first preliminary filling slave
To line voltage, heavy current impact when effectively can avoid grid-connected.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every utilization
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of soft-start method of energy feedback type charging/discharging apparatus is applied to the soft start of energy feedback type charging/discharging apparatus
In circuit, including host soft starting circuit and several slave soft starting circuits, the host soft starting circuit include being sequentially connected
The first exchange side soft-start module, the first grid-connected relay module, the first bus capacitor module, the first power switching modules with
And the first DC side soft-start module, the first exchange side soft-start module are connect with power grid, first DC side is soft to be opened
Dynamic model block is connected with direct current input, which is characterized in that including：
It drives the first exchange side soft-start module to be closed, host busbar voltage is charged to alternating current peak value in advance；
Close the first exchange side soft-start module, and the first bus capacitor module described in preliminary filling；
Judge whether the difference between the voltage and line voltage of the first bus capacitor module is less than preset voltage value；
If so, the first grid-connected relay module of driving and the first DC side soft-start module are closed and complete host soft start.
2. the soft-start method of energy feedback type charging/discharging apparatus according to claim 1, which is characterized in that the slave
Soft starting circuit includes sequentially connected second exchange side soft-start module, the second grid-connected relay module, the second bus capacitor
Module, the second power switching modules and the second DC side soft-start module, the second exchange side soft-start module and power grid
Connection, the second DC side soft-start module are connected with direct current input；The driving first grid-connected relay module and first
Further include after the step of DC side soft-start module closure completes host soft start：
The second exchange side soft-start module is driven to be closed, slave busbar voltage described in preliminary filling is equal to the host busbar voltage；
The second exchange side soft-start module is closed, the second DC side soft-start module, and the second bus capacitor of preliminary filling are closed
Module；
Judge whether the difference between the voltage and line voltage of the second bus capacitor module is less than the preset voltage value；
If so, being closed the second grid-connected relay module completes slave soft start.
3. the soft-start method of energy feedback type charging/discharging apparatus according to claim 1, which is characterized in that the preliminary filling
The first bus capacitor module specifically includes：
The first power switching modules are driven to send out PWM wave to the first bus capacitor module, to the first bus capacitor module by zero electricity
Pressure starts to charge up；
Alternating voltage identical with the line voltage characteristic of power grid is established in the first bus capacitor module.
4. the soft-start method of energy feedback type charging/discharging apparatus according to claim 3, which is characterized in that described
Alternating voltage identical with the line voltage characteristic of power grid is established in one bus capacitor module includes：
The first alternating voltage is established in the first bus capacitor module, between first alternating voltage and the line voltage of power grid
Difference be less than preset voltage value, and first alternating voltage is identical with the phase of line voltage.
5. the soft-start method of energy feedback type charging/discharging apparatus according to claim 2, which is characterized in that the preliminary filling
Second bus capacitor module specifically includes：
The second power switching modules are driven to send out PWM wave to the second bus capacitor module, to the second bus capacitor module by zero electricity
Pressure starts to charge up；
The second alternating voltage with amplitude same-phase with the line voltage of power grid is established in the second bus capacitor module.
6. a kind of soft starting device of energy feedback type charging/discharging apparatus, which is characterized in that including：
Host busbar voltage is charged to city by the first exchange preliminary filling unit in advance for driving the first exchange side soft-start module to be closed
Electric peak value；
First capacitance preliminary filling unit, for closing the first exchange side soft-start module, and the first bus capacitor module described in preliminary filling；
Whether the first judging unit, the difference between voltage and line voltage for judging the first bus capacitor module are small
In preset voltage value；
First soft control unit, for when first judging unit is judged as YES, driving the first grid-connected relay module
It is closed with the first DC side soft-start module and completes host soft start.
7. the soft starting device of energy feedback type charging/discharging apparatus according to claim 6, which is characterized in that further include：
Second exchange preliminary filling unit, for driving the second exchange side soft-start module to be closed, slave busbar voltage etc. described in preliminary filling
In the host busbar voltage；
Second capacitance preliminary filling unit is closed the second DC side soft start mould for closing the second exchange side soft-start module
Block, and preliminary filling the second bus capacitor module；
Whether second judgment unit, the difference between voltage and line voltage for judging the second bus capacitor module are small
In the preset voltage value；
Second soft control unit is closed second and network relay mould if for when the second judgment unit is judged as
Block completes slave soft start.
8. the soft starting device of energy feedback type charging/discharging apparatus according to claim 6, which is characterized in that described first
Capacitance preliminary filling unit includes：
First preliminary filling module, for driving the first power switching modules to send out PWM wave to the first bus capacitor module, to the first mother
Line capacitance module is started to charge up by no-voltage；
First preliminary filling keeps module, for establishing friendship identical with the line voltage characteristic of power grid in the first bus capacitor module
Galvanic electricity pressure.
9. the soft starting device of energy feedback type charging/discharging apparatus according to claim 8, which is characterized in that described first
Preliminary filling keep module include：
First voltage keeps submodule, for establishing the first alternating voltage, first exchange in the first bus capacitor module
Difference between voltage and the line voltage of power grid is less than preset voltage value, and the phase of first alternating voltage and line voltage
Position is identical.
10. the soft starting device of energy feedback type charging/discharging apparatus according to claim 7, which is characterized in that described
Two capacitance preliminary filling units include：
Second preliminary filling module, for driving the second power switching modules to send out PWM wave to the second bus capacitor module, to the second mother
Line capacitance module is started to charge up by no-voltage；
Second preliminary filling keeps module, for establishing the line voltage with power grid in the second bus capacitor module with amplitude same-phase
The second alternating voltage.
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| CN201810411720.5A CN108631347B (en) | 2018-05-02 | 2018-05-02 | Soft start method and device for energy feedback type charging and discharging equipment |
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| CN201810411720.5A CN108631347B (en) | 2018-05-02 | 2018-05-02 | Soft start method and device for energy feedback type charging and discharging equipment |
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| CN108631347B CN108631347B (en) | 2020-08-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217376A (en) * | 2018-10-12 | 2019-01-15 | 西安许继电力电子技术有限公司 | A kind of synchroswitching control method of metro braking feedback current transformer |
| CN111645526A (en) * | 2019-05-21 | 2020-09-11 | 南京南瑞继保电气有限公司 | Locomotive energy feedback device and electric energy feedback method, device and system thereof |
| EP3934044A1 (en) * | 2020-06-30 | 2022-01-05 | Eaton Intelligent Power Limited | Arrangement, circuit breaker and precharging device for a dc power network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105763037A (en) * | 2016-05-16 | 2016-07-13 | 浙江工业大学 | Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer |
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2018
- 2018-05-02 CN CN201810411720.5A patent/CN108631347B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763037A (en) * | 2016-05-16 | 2016-07-13 | 浙江工业大学 | Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217376A (en) * | 2018-10-12 | 2019-01-15 | 西安许继电力电子技术有限公司 | A kind of synchroswitching control method of metro braking feedback current transformer |
| CN109217376B (en) * | 2018-10-12 | 2020-07-07 | 西安许继电力电子技术有限公司 | Synchronous switching-on control method of subway brake feedback converter |
| CN111645526A (en) * | 2019-05-21 | 2020-09-11 | 南京南瑞继保电气有限公司 | Locomotive energy feedback device and electric energy feedback method, device and system thereof |
| EP3934044A1 (en) * | 2020-06-30 | 2022-01-05 | Eaton Intelligent Power Limited | Arrangement, circuit breaker and precharging device for a dc power network |
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| Publication number | Publication date |
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| CN108631347B (en) | 2020-08-28 |
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