CN106786782B - A kind of energy feedback system and its starting method - Google Patents
A kind of energy feedback system and its starting method Download PDFInfo
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- CN106786782B CN106786782B CN201710141081.0A CN201710141081A CN106786782B CN 106786782 B CN106786782 B CN 106786782B CN 201710141081 A CN201710141081 A CN 201710141081A CN 106786782 B CN106786782 B CN 106786782B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
Abstract
It include first contactor, bus, bus capacitor, current transforming unit, second contactor, supply conductor voltage detection unit, busbar voltage detection unit and Variable flow control unit in energy feedback system the invention discloses a kind of energy feedback system and its starting method；The busbar voltage that wherein Variable flow control unit receives the supply conductor voltage of supply conductor voltage detection unit transmission after being closed second contactor and busbar voltage detection unit is sent, and tracing control is implemented so that busbar voltage real-time tracking supply conductor voltage to current transforming unit；When starting, combined floodgate second contactor restarts current transforming unit and Variable flow control unit, implements tracing control to current transforming unit by Variable flow control unit, makes busbar voltage real-time tracking supply conductor voltage, first contactor of then closing a floodgate again.Using the technical solution, busbar voltage and supply conductor voltage are almost the same when energy feedback system is connect with Traction networks, so that Traction networks be made not impacted, further also can avoid bus capacitor and first contactor is hit in busbar charging and is damaged.
Description
Technical field
The present invention relates to field of track traffic, and in particular to a kind of starting of energy feedback system and the energy feedback system
Method.
Background technique
In 1500V or so when supply conductor voltage operates normally, and the mother before the networking starting of rail traffic energy feedback system
Line voltage initial value is 0.To ensure the two pressure difference before first contactor combined floodgate starting between energy feedback system and Traction networks
It is small as far as possible, because bigger to the impact of power grid, capacitor, switch when the bigger combined floodgate of pressure difference, it will cause panel switches tripping, capacitor damage
Bad, switching damage.Common way is when busbar voltage and to be led using Traction networks series buffer resistance to busbar charging in the market
Draw net voltage it is close when control first contactor close a floodgate docking, be using the deficiency of this method: 1, Traction networks by buffering electricity
When resistance charges to bus capacitor, impact will cause to Traction networks, be unfavorable for the stabilization and safety of rail traffic Traction networks；2,
Since there are the buffering effect of bus capacitor, busbar voltage can not track supply conductor voltage fluctuation in time；3, busbar charging speed
Relatively slow, the busbar voltage of Yao Shixian energy feedback system and the pressure difference of supply conductor voltage are sufficiently small, need the long period.
Summary of the invention
It is an object of the invention to solve the problems of the prior art, a kind of energy feedback system and starting method are provided,
The energy feedback system can be supported to realize more efficiently starting method, and when being started using the starting method, energy is returned
Busbar voltage and supply conductor voltage are almost the same when feedback system is connect with Traction networks, so that Traction networks be made not impacted；Into one
Step also can avoid bus capacitor and first contactor is damaged in busbar charging because being hit.
To reach above-mentioned purpose, the present invention adopts the following technical scheme:
A kind of energy feedback system, including first contactor, bus, bus capacitor, current transforming unit, second contactor, lead
Draw net voltage detection unit, busbar voltage detection unit and Variable flow control unit；The first contactor is for opening and closing traction
Net is electrically connected with bus, especially for being closed after busbar voltage traces into supply conductor voltage to establish Traction networks and bus
Electrical connection；The bus capacitor is connected across bus；The current transforming unit is for realizing direct current to exchange or exchange
To the conversion of direct current, DC terminal is connected across bus, exchanges end by second contactor and connects AC network；The traction
Net voltage detection unit is for measuring supply conductor voltage and being sent to Variable flow control unit；The busbar voltage detection unit is used
In measurement busbar voltage and it is sent to Variable flow control unit；The Variable flow control unit is received after being closed second contactor and is led
The busbar voltage that the supply conductor voltage and busbar voltage detection unit for drawing the transmission of net voltage detection unit are sent, and to current transforming unit
Implement tracing control so that busbar voltage real-time tracking supply conductor voltage.
Further, the current transforming unit use with Bidirectional variable-flow function circuit, can for three phase full bridge circuit,
Three-phase half-bridge circuit, T-type tri-level circuit or I type tri-level circuit.
Further, the energy feedback system further includes one group or more of exchange buffer cell, every group of exchange buffering
Unit is in parallel with second contactor, and includes the buffer resistance and third contactor being serially connected.
The starting method of energy feedback system in the first two technical solution includes the following steps: step 11: combined floodgate second
Contactor；Step 12: starting current transforming unit and Variable flow control unit after delay first time interval, by Variable flow control unit to change
It flows unit and implements tracing control so that busbar voltage real-time tracking supply conductor voltage；Step 13: in Variable flow control unit to unsteady flow
During unit implements tracing control, the absolute value of difference is between Variable flow control unit judges busbar voltage and supply conductor voltage
No 2% less than or equal to supply conductor voltage, being such as judging result is to then follow the steps 14, if judging result is otherwise to return again
Secondary execution step 13；Step 14: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep female
Line voltage；Step 15: combined floodgate first contactor.
Further, the first time interval is greater than or equal to 50 milliseconds.
The starting method of energy feedback system in the third technical solution includes the following steps: step 21: buffering of closing a floodgate
The third contactor of unit；Step 22: second contactor of closing a floodgate after the second time interval of delay；Step 23: the delay third time
Start current transforming unit and Variable flow control unit behind interval, tracing control is implemented so that bus to current transforming unit by Variable flow control unit
Voltage real-time tracking supply conductor voltage；Step 24: during Variable flow control unit implements tracing control to current transforming unit, unsteady flow
Control unit judges whether the absolute value of the difference between busbar voltage and supply conductor voltage is less than or equal to supply conductor voltage
2%, being such as judging result is to then follow the steps 25, if judging result is otherwise to return to execution step 24 again；Step 25: unsteady flow
Control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep busbar voltage；Step 26: combined floodgate first connects
Tentaculum.
Further, step 21 executes as follows: if only one group of buffer cell, close a floodgate the buffer cell
Third contactor；If there is two groups or more buffer cell, then according to the buffer resistance resistance value of each buffer cell from big
It successively closes a floodgate the third contactor of each buffer cell to small sequence, postpones the second time interval before closing a floodgate every time, until institute
There is the third contactor of buffer cell all to close a floodgate.
Further, further include step 22.5: opening a sluice gate the third contactor of all buffer cells；The step 22.5 can
It is arranged in after step 22 to either step in 26.
Further, second time interval is greater than or equal to 50 milliseconds.
Further, the third time interval is greater than or equal to 50 milliseconds.
Compared with the existing technology, the beneficial effect of acquirement is technical solutions according to the invention:
1, when energy feedback system starting, electric energy is obtained by AC network, and pass through the control of Variable flow control unit
Current transforming unit processed enables busbar voltage to track supply conductor voltage, so that Traction networks are not rushed in energy feedback system starting
It hits；
2, current transforming unit uses the circuit with Bidirectional variable-flow function, has the function of reversed uncontrollable rectifier, therefore can be fast
Speed makes bus boost through reversed uncontrollable rectifier function；
3, by setting exchange buffer cell, gradually rise busbar voltage, bus capacitor is able to current limliting buffering when charging,
Avoid the damage of first contactor and bus capacitor；
4, setting first time interval is 50ms or more, reaches charging voltage convenient for busbar voltage；
5, it when there is multiple groups buffer cell, is successively closed according to the buffer resistance resistance value sequence from big to small of each buffer cell
The third contactor of each buffer cell of lock, successively boosts convenient for bus, can preferably reach current limitation effect, protects bus capacitor
It is not damaged with first contactor；
6, all buffer cells are opened a sluice gate, convenient for the normal operation after energy feedback system starting；
7, the second time interval and third time interval is arranged is 50ms or more, reaches charging voltage convenient for busbar voltage.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand invention, constitutes a part of the invention, the present invention
Illustrative embodiments and their description be used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is each component relation schematic diagram in one energy feedback system of the embodiment of the present invention；
Fig. 2 is one energy feedback system circuit diagram of the embodiment of the present invention；
Fig. 3 is that one energy feedback system of the embodiment of the present invention starts method voltage-timing diagram；
Fig. 4 is each component relation schematic diagram in three energy feedback system of the embodiment of the present invention two and embodiment；
Fig. 5 is two energy feedback system circuit diagram of the embodiment of the present invention；
Fig. 6 is that two energy feedback system of the embodiment of the present invention starts method voltage-timing diagram；
Fig. 7 is three energy feedback system circuit diagram of the embodiment of the present invention；
Fig. 8 is that three energy feedback system of the embodiment of the present invention starts method voltage-timing diagram.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
Fig. 1 shows in embodiment one each component relationship in energy feedback system.As shown in Figure 1, in embodiment one, energy
Feedback system includes first contactor 2, bus 3, bus capacitor 4, current transforming unit 5, second contactor 6, supply conductor voltage detection
Unit 7, busbar voltage detection unit 8 and Variable flow control unit 9.Wherein, first contactor 2 is for opening and closing Traction networks 1 and bus 3
Electrical connection, especially for being closed after busbar voltage traces into supply conductor voltage to establish being electrically connected for Traction networks 1 and bus 3
Connect relationship；Bus capacitor 4 is connected across bus 3；Current transforming unit 5 for realizing direct current to exchange or AC-to DC conversion,
DC terminal is connected across bus 3, and exchange end connects AC network 10 by second contactor 6；Supply conductor voltage detection unit 7 is used
In measurement supply conductor voltage and it is sent to Variable flow control unit 9；Busbar voltage detection unit 8 is for measuring busbar voltage and sending
To Variable flow control unit 9；Variable flow control unit 9 receives the transmission of supply conductor voltage detection unit 7 after being closed second contactor 6
The busbar voltage that supply conductor voltage and busbar voltage detection unit 8 are sent, and tracing control is implemented so that bus to current transforming unit 5
Voltage real-time tracking supply conductor voltage.Wherein, so-called " tracing into ", that is, refer to difference between busbar voltage and supply conductor voltage
Absolute value is less than or equal to the 2% of supply conductor voltage.
It (does not include supply conductor voltage detection unit, bus Fig. 2 shows the circuit diagram of energy feedback system in embodiment one
Voltage detection unit and Variable flow control unit).Wherein, the entitled KM1 of first contactor, the entitled KM2 of second contactor.Unsteady flow
Unit use three level two-way current conversion circuit of T-type, controllable switch device using IGBT and with the antiparallel freewheeling diode of IGBT.
LC filter circuit is also provided between current transforming unit and second contactor.Transformer is further comprised in AC network, second connects
Tentaculum KM2 connects external communication power grid after connecting with transformer again.In example 1, supply conductor voltage detection unit and bus electricity
Pressure detection unit is all made of Hall voltage sensor.
Fig. 3 shows the embodiment of the present invention one and starts method voltage-timing diagram.Wherein 13 be supply conductor voltage, 14
For busbar voltage.Energy feedback system starting method in the embodiment of the present invention one is as follows:
Step 11: combined floodgate second contactor KM2, in Fig. 3, the time point of combined floodgate is T11.Since current transforming unit uses T-type
Three level two-way current conversion circuits, and include the freewheeling diode with uncontrollable rectifier function, AC network in controllable switch device
By second contactor KM2 and current transforming unit to busbar charging, busbar voltage is made to rise to the peak value of ac grid voltage.
Step 12: starting current transforming unit and change in T12 time point after delay first time interval (being 50ms in the present embodiment)
Flow control unit implements tracing control to current transforming unit by Variable flow control unit, so that busbar voltage real-time tracking Traction networks electricity
Pressure；So-called real-time tracking refers to the time being manually set at interval of one, acquires supply conductor voltage value, and by Variable flow control
Unit controls current transforming unit, makes busbar voltage close or equal to the collected supply conductor voltage value.So-called tracing control is
Refer to that Variable flow control unit is the control measure realizing real-time tracking and using to current transforming unit.
Step 13: during Variable flow control unit implements tracing control to current transforming unit, Variable flow control unit judges are female
Whether the absolute value of difference is less than or equal to the 2% of supply conductor voltage between line voltage and supply conductor voltage, as judging result is
It is to then follow the steps 14, if judging result is otherwise to return to execution step 13 again.
Step 14: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep bus electricity
Pressure.Variable flow control unit changes control strategy, control strategy is changed into holding busbar voltage from tracing control, so-called holding is female
Line voltage refers to that Variable flow control unit controls current transforming unit, busbar voltage is made to be maintained at the busbar voltage before change control strategy
Value.
Step 15: combined floodgate first contactor KM1, combined floodgate time point are T13.To connect Traction networks and bus, energy is completed
The starting of feedback system.
The starting of energy feedback system is completed by above step.When due to energy feedback system starting, pass through alternating current
Net obtains electric energy, and controls current transforming unit by Variable flow control unit, so that busbar voltage is tracked supply conductor voltage, thus really
Protecting energy feedback system, Traction networks are not hit on startup.
Fig. 4 shows in embodiment two and embodiment three each component relationship in energy feedback system.As shown in figure 4, implementing
In example two and embodiment three, energy feedback system includes first contactor 2, bus 3, bus capacitor 4, current transforming unit 5, second connects
Tentaculum 6, supply conductor voltage detection unit 7, busbar voltage detection unit 8, Variable flow control unit 9 and one group or more exchange buffering
Unit.Wherein, first contactor 2 is used to open and close being electrically connected for Traction networks 1 and bus 3, especially for tracking in busbar voltage
It is closed after to supply conductor voltage to establish the electrical connection of Traction networks 1 Yu bus 3；Bus capacitor 4 is connected across bus 3；Unsteady flow
Unit 5 is connected across bus 3 to exchange or the conversion of AC-to DC, DC terminal for realizing direct current, and exchange end passes through the
Two contactors 6 connect AC network 10；Supply conductor voltage detection unit 7 is for measuring supply conductor voltage and being sent to Variable flow control
Unit 9；Busbar voltage detection unit 8 is for measuring busbar voltage and being sent to Variable flow control unit 9；Variable flow control unit 9 exists
The supply conductor voltage and the hair of busbar voltage detection unit 8 that supply conductor voltage detection unit 7 is sent are received after being closed second contactor 6
The busbar voltage sent, and tracing control is implemented so that busbar voltage real-time tracking supply conductor voltage to current transforming unit 5；Every group of exchange
Buffer cell is in parallel with second contactor 6, and includes the buffer resistance 12 and third contactor 11 being serially connected.On and
So-called " tracing into " is stated, that is, refers to that the absolute value of difference between busbar voltage and supply conductor voltage is less than or equal to supply conductor voltage
2%.
The circuit diagram that Fig. 5 shows energy feedback system in embodiment two (does not include supply conductor voltage detection unit, bus
Voltage detection unit and Variable flow control unit).Wherein, the entitled KM3 of first contactor, the entitled KM4 of second contactor, third
The entitled KM5 of contactor.Current transforming unit use three level two-way current conversion circuit of T-type, controllable switch device using IGBT and with
The antiparallel freewheeling diode of IGBT.LC filter circuit is also provided between current transforming unit and second contactor.AC network
In further comprise transformer, second contactor KM4 connects external communication power grid after connecting with transformer again.Supply conductor voltage detection is single
Member and busbar voltage detection unit are all made of Hall voltage sensor.
Fig. 6 shows the embodiment of the present invention two and starts method voltage-timing diagram.Wherein 15 be supply conductor voltage, 16
For busbar voltage.Energy feedback system starting method in the embodiment of the present invention two is as follows:
Step 21: the third contactor KM5 of combined floodgate buffer cell.The time point of combined floodgate is T21.Since current transforming unit uses T
Three level two-way current conversion circuit of type, and include the freewheeling diode with uncontrollable rectifier function, alternating current in controllable switch device
Make bus capacitor C1 and C2 charging pressure-boosting after buffer resistance R divides current limliting.Current limliting buffers when bus capacitor being enable to charge, and keeps away
The damage of first contactor and bus capacitor is exempted from.
Step 22: in T22 time point combined floodgate second contactor after the second time interval of delay (being 50ms in the present embodiment)
KM4.Make AC network through second contactor KM4 to the further charging pressure-boosting of bus capacitor C1 and C2.
Step 23: starting current transforming unit and change in T23 time point after delay third time interval (being 50ms in the present embodiment)
Flow control unit implements tracing control to current transforming unit by Variable flow control unit so that busbar voltage real-time tracking Traction networks electricity
Pressure.So-called real-time tracking refers to the time being manually set at interval of one, acquires supply conductor voltage value, and by Variable flow control
Unit controls current transforming unit, makes busbar voltage close or equal to the collected supply conductor voltage value.So-called tracing control is
Refer to that Variable flow control unit is the control measure realizing real-time tracking and using to current transforming unit.
Step 24: during Variable flow control unit implements tracing control to current transforming unit, Variable flow control unit judges are female
Whether the absolute value of difference is less than or equal to the 2% of supply conductor voltage between line voltage and supply conductor voltage, as judging result is
It is to then follow the steps 25, if judging result is otherwise to return to execution step 24 again.
Step 25: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep bus electricity
Pressure.Variable flow control unit changes control strategy, control strategy is changed into holding busbar voltage from tracing control, so-called holding is female
Line voltage refers to that Variable flow control unit controls current transforming unit, busbar voltage is made to be maintained at the busbar voltage before change control strategy
Value.
Step 26: combined floodgate first contactor KM3, combined floodgate time point are T24.To connect Traction networks and bus, energy is completed
The starting of feedback system.
The starting of energy feedback system is completed by above step.When due to energy feedback system starting, pass through alternating current
Net obtains electric energy, and controls current transforming unit by Variable flow control unit, so that busbar voltage is tracked supply conductor voltage, thus really
Protecting energy feedback system, Traction networks are not hit on startup.Meanwhile buffer cell is exchanged by setting, make busbar voltage gradually
Rise, bus capacitor is able to current limliting buffering when charging, avoid the damage of first contactor and bus capacitor.
The circuit diagram that Fig. 7 shows energy feedback system in embodiment three (does not include supply conductor voltage detection unit, bus
Voltage detection unit and Variable flow control unit).It is not both to be equipped with two groups of buffer cells with embodiment two.First group of buffer cell
Including buffer resistance R8 and third contactor KM8, second group of buffer cell includes buffer resistance R9 and third contactor KM9, and
R8>R9.Each buffer cell is all in parallel with second contactor KM7.The entitled KM6 of first contactor.
Fig. 8 shows the embodiment of the present invention three and starts method voltage-timing diagram.Wherein, 17 be supply conductor voltage, 18
For busbar voltage.Energy feedback system starting method in the embodiment of the present invention three is as follows:
Step 21.1: closing a floodgate and the concatenated third contactor KM8 of R8, combined floodgate time point is T31 in fig. 8.Alternating current is through slow
Make bus capacitor C1 and C2 charging pressure-boosting after rushing resistance R8 partial pressure current limliting.
Step 21.2: closing a floodgate and R9 concatenated the after the second time interval of delay (in the present embodiment be 1s) in T32 time point
Three contactor KM9；Alternating current makes bus capacitor C1 and C2 charging pressure-boosting after resistance R8 and resistance R9 partial pressure current limliting.Due to resistance
R8 and resistance R9 is parallel relationship.Therefore, the resistance after parallel connection is less than R8, and partial pressure metering function is smaller, therefore, bus capacitor C1
It is further boosted with C2.
Step 22: in T33 time point combined floodgate second contactor KM7 after the second time interval of delay (being 1s in the present embodiment).
Make AC network through second contactor KM7 to the further charging pressure-boosting of bus capacitor C1 and C2.
Step 22.5: opening a sluice gate third the contactor KM8 and KM9 of all buffer cells；The step 22.5 can also arrange
In step 22 to 26 after either step.
Step 23: starting current transforming unit and unsteady flow in T34 time point after delay third time interval (being 1s in the present embodiment)
Control unit implements tracing control so that busbar voltage real-time tracking supply conductor voltage to current transforming unit by Variable flow control unit.
So-called real-time tracking refers to the time being manually set at interval of one, acquires supply conductor voltage value, and by Variable flow control unit
Current transforming unit is controlled, makes busbar voltage close or equal to the collected supply conductor voltage value.So-called tracing control refers to change
Flow control unit is the control measure realizing real-time tracking and using to current transforming unit.
Step 24: during Variable flow control unit implements tracing control to current transforming unit, Variable flow control unit judges are female
Whether the absolute value of difference is less than or equal to the 2% of supply conductor voltage between line voltage and supply conductor voltage, as judging result is
It is to then follow the steps 25, if judging result is otherwise to return to execution step 24 again.
Step 25: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep bus electricity
Pressure.Variable flow control unit changes control strategy, control strategy is changed into holding busbar voltage from tracing control, so-called holding is female
Line voltage refers to that Variable flow control unit controls current transforming unit, busbar voltage is made to be maintained at the busbar voltage before change control strategy
Value.
Step 26: combined floodgate first contactor KM6, combined floodgate time point are T35.To connect Traction networks and bus, energy is completed
The starting of feedback system.
The starting of energy feedback system is completed by above step.Due to being equipped with two groups of buffer cells, according to each buffer cell
Buffer resistance resistance value sequence from big to small successively close a floodgate the third contactor of each buffer cell, successively risen convenient for bus
Pressure can preferably reach current limitation effect, protect bus capacitor and first contactor not damaged；All buffer cells are opened a sluice gate,
Convenient for the normal operation after energy feedback system starting.
Description above describe the preferred embodiment of the present invention, it is to be understood that the present invention is not limited to above-mentioned implementation
Example, and excluding other embodiments should not be regarded as.Enlightenment through the invention, those skilled in the art combine known or existing
The change that technology, knowledge are carried out also should be regarded as within the scope of the present invention.
Claims (10)
1. a kind of energy feedback system, it is characterized in that including first contactor, bus, bus capacitor, current transforming unit, the second contact
Device, supply conductor voltage detection unit, busbar voltage detection unit and Variable flow control unit；
The first contactor after busbar voltage traces into supply conductor voltage for being closed to establish Traction networks and bus
Electrical connection；
The bus capacitor is connected across bus；
The current transforming unit is connected across bus to exchange or the conversion of AC-to DC, DC terminal for realizing direct current,
It exchanges end and AC network is connected by second contactor；
The supply conductor voltage detection unit is for measuring supply conductor voltage and being sent to Variable flow control unit；
The busbar voltage detection unit is for measuring busbar voltage and being sent to Variable flow control unit；
The Variable flow control unit receives the Traction networks electricity of supply conductor voltage detection unit transmission after being closed second contactor
Pressure and busbar voltage detection unit send busbar voltage, and to current transforming unit implement tracing control so that busbar voltage in real time with
Track supply conductor voltage.
2. a kind of energy feedback system as described in claim 1, it is characterized in that the current transforming unit, which uses, has two-way change
The circuit for flowing function, can be three phase full bridge circuit, three-phase half-bridge circuit, T-type tri-level circuit or I type tri-level circuit.
3. a kind of energy feedback system as claimed in claim 1 or 2, it is characterized in that further including one group or more of exchange buffering list
Member, every group of exchange buffer cell is in parallel with second contactor, and includes the buffer resistance being serially connected and third contact
Device.
4. a kind of starting method of energy feedback system is used for energy feedback system as claimed in claim 1 or 2, special
Sign is to include the following steps:
Step 11: combined floodgate second contactor；
Step 12: starting current transforming unit and Variable flow control unit after delay first time interval, by Variable flow control unit to unsteady flow
Unit implements tracing control so that busbar voltage real-time tracking supply conductor voltage；
Step 13: during Variable flow control unit implements tracing control to current transforming unit, Variable flow control unit judges bus electricity
Whether the absolute value of difference is less than or equal to the 2% of supply conductor voltage between pressure and supply conductor voltage, if judging result is to be
Step 14 is executed, if judging result is otherwise to return to execution step 13 again；
Step 14: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep busbar voltage；
Step 15: combined floodgate first contactor.
5. a kind of starting method of energy feedback system as claimed in claim 4, it is characterized in that the first time interval
More than or equal to 50 milliseconds.
6. a kind of starting method of energy feedback system, is used for energy feedback system as claimed in claim 3, feature
It is to include the following steps:
Step 21: the third contactor of combined floodgate buffer cell；
Step 22: second contactor of closing a floodgate after the second time interval of delay；
Step 23: starting current transforming unit and Variable flow control unit after delay third time interval, by Variable flow control unit to unsteady flow
Unit implements tracing control so that busbar voltage real-time tracking supply conductor voltage；
Step 24: during Variable flow control unit implements tracing control to current transforming unit, Variable flow control unit judges bus electricity
Whether the absolute value of the difference between pressure and supply conductor voltage is less than or equal to the 2% of supply conductor voltage, if judging result is yes
25 are thened follow the steps, if judging result is otherwise to return to execution step 24 again；
Step 25: Variable flow control unit stops the tracing control to current transforming unit, and controls current transforming unit and keep busbar voltage；
Step 26: combined floodgate first contactor.
7. a kind of starting method of energy feedback system as claimed in claim 6, it is characterized in that: the step 21 is by as follows
Mode executes:
If only one group of buffer cell, the third contactor for the buffer cell that closes a floodgate；If there is two groups or more
Buffer cell then successively closes a floodgate the third of each buffer cell according to the sequence of the buffer resistance resistance value of each buffer cell from big to small
Contactor postpones the second time interval before closing a floodgate every time, until the third contactor of all buffer cells all closes a floodgate.
8. a kind of starting method of energy feedback system as claimed in claim 7, characterized in that further include step 22.5: opening
The third contactor of all buffer cells of lock；The step 22.5 can be arranged in after step 22 to either step in 26.
9. a kind of starting method of energy feedback system as described in claim 6,7 or 8, it is characterized in that: when described second
Between interval be greater than or equal to 50 milliseconds.
10. a kind of starting method of energy feedback system as described in claim 6,7 or 8, it is characterized in that: when the described third
Between interval be greater than or equal to 50 milliseconds.
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| CN201710141081.0A CN106786782B (en) | 2017-03-10 | 2017-03-10 | A kind of energy feedback system and its starting method |
| PCT/CN2017/102477 WO2018161524A1 (en) | 2017-03-10 | 2017-09-20 | Energy feedback system and starting method therefor |
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| CN106786782B (en) * | 2017-03-10 | 2019-10-22 | 科华恒盛股份有限公司 | A kind of energy feedback system and its starting method |
| CN108199605A (en) * | 2018-02-11 | 2018-06-22 | 常州博能新能源有限公司 | Two-way inverter and the neutral-point potential balance method based on distribution factor method |
| CN112838773A (en) | 2019-11-25 | 2021-05-25 | 开利公司 | Power module and converter with asymmetric semiconductor rating arrangement |
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| WO2018161524A1 (en) | 2018-09-13 |
| CN106786782A (en) | 2017-05-31 |
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