CN108155657A - Energy accumulation current converter and its main circuit topological structure and balance control method - Google Patents
Energy accumulation current converter and its main circuit topological structure and balance control method Download PDFInfo
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- CN108155657A CN108155657A CN201810002577.4A CN201810002577A CN108155657A CN 108155657 A CN108155657 A CN 108155657A CN 201810002577 A CN201810002577 A CN 201810002577A CN 108155657 A CN108155657 A CN 108155657A
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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
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The present invention relates to energy accumulation current converter and its main circuit topological structures and balance control method, each switch module in energy accumulation current converter main circuit topological structure is corresponded with each energy-storage battery module, switch module includes the first control switch and the second control switchs, second control switch of each switch module is arranged in series to form a series circuit, the series circuit connects the DC side of AC/DC conversion modules, each energy-storage battery module and the corresponding second control switch in parallel connection, connecting line road string between each energy-storage battery module and the corresponding second control switch is equipped with the corresponding first control and switchs.Whether charge balancing control strategy or equalization discharge control strategy are carried out according to the diversity judgement of the voltage of energy-storage battery module and average voltage.By being cascaded in series for energy-storage battery module, with reference to the energy-storage battery module equalization requirement of itself, the common Balance route for realizing battery pack improves the utilization rate of energy-storage battery module, extends service life.
Description
Technical field
The present invention relates to energy accumulation current converter and its main circuit topological structures and balance control method.
Background technology
Energy accumulation current converter：Set is assembled with energy-storage battery, is connected between battery pack and power grid, power grid electric energy is stored in battery
Group or the device that battery pack power is fed back to power grid, are mainly made of bidirectional power current transformer and its control system.
Energy storage technology is one of the hot spot of application and research of Abroad in Recent Years energy-storage system in electric system, many hairs
The research of energy storage technology is all attached great importance to up to country.It is random that energy storage technology can solve generation of electricity by new energy, electric vehicle charges
Property, fluctuation sex chromosome mosaicism, can realize the smooth output of generation of electricity by new energy, effectively adjust generation of electricity by new energy and electric vehicle charging draws
The variation of network voltage, frequency and phase risen, makes large-scale wind power and solar power generation easily and reliably be incorporated to normal grid；
It can realize the peak load shifting of intelligent grid and region energy management, save power grid construction and the investment of standby capacity, it is energy saving to subtract
Row.
Energy accumulation current converter is as a connection energy-storage battery and the conversion equipment of power grid, by engineering practice for many years,
The required function that is connected to the grid is very perfect.But not intelligence is docked with energy-storage battery, energy accumulation current converter is to energy-storage battery
Voltage class have stringent range constraint, once energy-storage battery is fed, reusing will be very difficult.And energy storage unsteady flow
Device can not comprehensively take the harmony of energy-storage battery itself into account in charge and discharge process, and it is unfavorable that the equalizing strip of energy-storage battery is come
Factor.So how the realization of high efficient and reliable just becomes particularly significant to the utilization of energy-storage battery.
Authorization Notice No. be CN103219899B Chinese patent document disclose a kind of mixed type energy storage converter device and
Its progress control method, the main circuit of energy storage converter device uses the Two Stages topological structure of AC/DC and DC/DC, in battery
Usually there are following measures on the strategy of charge and discharge：1) using control strategies such as invariable power, current constant control, Isobarically Controls to different
Energy-storage battery carries out the charging modes of different mode；2) permitted by the maximum allowable charge-discharge electric power and maximum that are transmitted to BMS
Perhaps the charge and discharge that charging and discharging currents come to battery carry out protectiveness charge and discharge logic.
However, the energy conversion efficiency of Two Stages is relatively low, mostly using the main circuit topology of one-stage transfor-mation.One-stage transfor-mation is opened up
It flutters due to being limited by alternating voltage, stringent limitation has been carried out to the range of DC side cell voltage.
Therefore, have the shortcomings that existing topological structure：1) energy accumulation current converter is controlled just for battery port voltage, nothing
Method reasonably controls the Voltage unbalance of internal battery pack, and long-play can aggravate the imbalance of internal battery pack
Property；2) although Two Stages circuit topology can realize the loose property of battery voltage range, energy conversion efficiency is relatively low,
And primary conversion circuit topology is difficult then to break through in battery voltage range.
Invention content
The object of the present invention is to provide a kind of energy accumulation current converters, can not to solve existing energy accumulation current converter topological structure
The problem of rational Balance route is carried out to the Voltage unbalance of internal battery pack.Present invention simultaneously provides a kind of energy accumulation current converters
Main circuit topological structure and a kind of energy accumulation current converter balance control method.
To achieve the above object, the present invention includes following technical scheme.
Current transformer scheme one：This programme provides a kind of energy accumulation current converter, including energy-storage battery group and main circuit topological structure,
The energy-storage battery group includes at least two energy-storage battery modules, and the main circuit topological structure includes AC/DC conversion modules, institute
The exchange side of AC/DC conversion modules is stated for connecting AC network, the main circuit topological structure further includes at least two switches
Module, each switch module are corresponded with each energy-storage battery module, and the switch module includes the first control switch and the second control
System switch, the second control switch of each switch module are arranged in series to form a series circuit, and the series circuit connects institute
State the DC side of AC/DC conversion modules, each energy-storage battery module and the corresponding second control switch in parallel connection, each energy-storage battery
Connecting line road string between module and the corresponding second control switch is equipped with the corresponding first control and switchs.
In the energy accumulation current converter that this programme provides, each energy-storage battery module is corresponding with switch module, and energy accumulation current converter is just
Often during work, each switching molding the first control switch in the block is in the conduction state, and the second control switch is off state, each to store up
Energy battery module is arranged in series by each first control switch；When some energy-storage battery module is unsatisfactory for the condition of normal operation
When, i.e., when the Voltage unbalance of entire internal battery pack, the corresponding first control switch OFF of the energy-storage battery module is controlled,
And second controls switch conduction, then, which is in open-circuit condition, for entire battery pack, the energy storage
Battery module is bypassed, and can not just charge to the energy-storage battery module or the energy-storage battery module just can not be outside
The Balance route of battery pack is realized in electric discharge.Such as：When the voltage of the energy-storage battery module is higher, and battery pack is in charging shape
During state, the corresponding first control switch OFF of the energy-storage battery module, the second control switch conduction, the energy-storage battery module are controlled
It can not charge, since other energy-storage battery modules charge normal, then, the voltage of the energy-storage battery module and other storages
Difference between the voltage of energy battery module becomes less and less, the Balance route of entire battery pack is realized, similarly, when the energy storage
The voltage of battery module is relatively low, and when battery pack is in discharge condition, and corresponding first control of the energy-storage battery module is controlled to open
Shutdown, the second control switch conduction, which can not discharge, since other energy-storage battery modules are normal
Electric discharge, then, the difference between the voltage of the voltage of the energy-storage battery module and other energy-storage battery modules becomes less and less,
Realize the Balance route of entire battery pack.Therefore, by being cascaded in series for energy-storage battery module, with reference to energy-storage battery module certainly
The equalization requirement of body, it is common to realize the Balance route of battery pack, while realize energy accumulation current converter and exist to energy-storage battery module
The line ability of equalization improves the utilization rate of energy-storage battery module, extends the service life of battery pack；Improve battery pack can
Maintainability, the facility that battery group maintenance can be completed in battery case need not be dismantled by realizing.In addition, for energy accumulation current converter to battery
The uncontrollability that inside is flowed is made up, and the sharing control of battery is made no longer to be the small of inside battery by the circuit topology
Range flows, but realizes the sharing control of entire battery pack；Also, by the control to circuit topology, it can become in level-one
It changes on the basis of structure, the function of Two Stages structure is realized in combination, is realized that the drop of low voltage range holds drop efficiency operation, is improved
Adaptability of the energy accumulation current converter to battery voltage range.
Current transformer scheme two：On the basis of current transformer scheme one, each first control switch is arranged on corresponding energy storage electricity
Connecting line road between the anode of pond module and the corresponding second control switch.
Current transformer scheme three：On the basis of current transformer scheme one or two, the AC/DC conversion modules are three level AC/
DC translation circuits, the AC/DC conversion modules include three bridge arms and a capacitive branch, and string is equipped with the first work(on each bridge arm
Rate module and the second power module, the first power module and the second power module are made of two power device series connection, each item
For connecting AC network, the capacitive branch is set the tie point between the first power module and the second power module on bridge arm
The DC side in the AC/DC conversion modules is put, the capacitive branch is by the first capacitance module and the second capacitance module series connection structure
Into the tie point between first capacitance module and the second capacitance module connects on each article of bridge arm by diode respectively
The tie point of two power devices in the tie point and the second power module of two power devices in one power module.
Current transformer scheme four：On the basis of current transformer scheme one or two, the first control switch of each switch module and the
Two control switches are IGBT.
Main circuit topological structure scheme one：This programme provides a kind of energy accumulation current converter main circuit topological structure, including AC/DC
Conversion module, the exchange side of the AC/DC conversion modules for connecting AC network, the main circuit topological structure further include to
Few two switch modules, each switch module are corresponded with each energy-storage battery module, and the switch module includes the first control and opens
It closes and the second control switchs, the second control switch of each switch module is arranged in series to form a series circuit, the series connection
The DC side of AC/DC conversion modules described in connection, it is each second control switch for corresponding energy-storage battery wired in parallel
Connection, each first control switch are located at the connection between corresponding energy-storage battery module and the corresponding second control switch for string
On circuit.
Main circuit topological structure scheme two：On the basis of main circuit topological structure scheme one, each first control switch is set
It puts on the connecting line road between the anode and the corresponding second control switch of corresponding energy-storage battery module.
Main circuit topological structure scheme three：On the basis of main circuit topological structure scheme one or two, the AC/DC transformation
Module is three level AC/DC translation circuits, and the AC/DC conversion modules include three bridge arms and a capacitive branch, each bridge
String is equipped with the first power module and the second power module on arm, and the first power module and the second power module are by two power devices
Part is in series, and the tie point between the first power module and the second power module on each bridge arm is used to connect alternating current
Net, the capacitive branch are arranged on the DC side of the AC/DC conversion modules, and the capacitive branch is by the first capacitance module and
Two capacitance modules are in series, and the tie point between first capacitance module and the second capacitance module is connected respectively by diode
Connect two power in the tie point and the second power module of two power devices in the first power module on each bridge arm
The tie point of device.
Main circuit topological structure scheme four：On the basis of main circuit topological structure scheme one or two, each switch module
First control switch and the second control switch are IGBT.
Method scheme one：This programme provides a kind of energy accumulation current converter for being exclusively used in energy accumulation current converter described in current transformer scheme one
Balance control method includes the following steps：
(1) voltage of each energy-storage battery module is detected, and calculates average voltage；
(2) when the voltage of some energy-storage battery module be more than average voltage, and the voltage of the energy-storage battery module with
When the error amount of average voltage is more than the first setting error amount, judge whether energy accumulation current converter is operated in charged state, if storage
Energy current transformer is operated in charged state, then carries out charge balancing control strategy, be：Disconnect the energy-storage battery module corresponding first
Control switch is closed corresponding second control switch, bypasses the energy-storage battery module, which is not filled
Electricity；
When the voltage of some energy-storage battery module is less than average voltage, and the voltage and voltage of the energy-storage battery module
When the absolute value of the error amount of average value is more than the second setting error amount, judge whether energy accumulation current converter is operated in discharge condition,
If energy accumulation current converter is operated in discharge condition, equalization discharge control strategy is carried out, is：It is corresponding to disconnect the energy-storage battery module
First control switch, be closed it is corresponding second control switch, bypass the energy-storage battery module, the energy-storage battery module without
Electric discharge.
Method scheme two：On the basis of method scheme one, in the charge balancing control strategy, first by energy accumulation current converter
Charge power be reduced to 0, be then turned off the first control switch of corresponding energy-storage battery module, be closed the second control switch, connect
Recovery charge power；In the equalization discharge control strategy, the discharge power of energy accumulation current converter is first reduced to 0, is then broken
The first control switch of corresponding energy-storage battery module is opened, the second control switch is closed, then restores discharge power.
Method scheme three：It is corresponding during carrying out the charge balancing control strategy on the basis of method scheme one
Energy-storage battery module voltage and average voltage between error it is less and less, when the energy-storage battery module voltage with electricity
When flattening the error amount of mean value less than third setting error amount, the corresponding second control switch of the energy-storage battery module is disconnected, is closed
Corresponding first control switch is closed, to exit the charge balancing control strategy, works normally the energy-storage battery module recovery
State；The first setting error amount is more than the third and sets error amount；
During carrying out the equalization discharge control strategy, the voltage and average voltage of corresponding energy-storage battery module
Between error it is less and less, when the voltage and average voltage of the energy-storage battery module error amount absolute value be less than the 4th
When setting error amount, the corresponding second control switch of the energy-storage battery module is disconnected, corresponding first control switch is closed, to move back
Go out the equalization discharge control strategy, make the energy-storage battery module recovery normal operating conditions；The second setting error amount is big
Error amount is set in the described 4th.
Method scheme four：On the basis of method scheme one, when battery pack is fed, the of each switch module is controlled
One control switch conduction controls the second of each switch module to control switch OFF, the first switch module on the series circuit
First control switch and the last one switch module second control switch form battery pack chopper circuit, by control should
The duty ratio realization of chopper circuit charges to the battery pack of feed, to restore voltage.
Method scheme five：On the basis of method scheme three, when exiting the charge balancing control strategy, first by energy storage
The charge power of current transformer is reduced to 0, is then turned off the second control switch of corresponding energy-storage battery module, is closed the first control and opens
It closes, then restores charge power；When exiting the equalization discharge control strategy, first the discharge power of energy accumulation current converter is reduced
To 0, the second control switch of corresponding energy-storage battery module is then turned off, the first control switch is closed, then restores discharge power.
Method scheme six：On the basis of method scheme two or five, during corresponding power is reduced to 0, power
0 is reduced to according to fixed slope.
Description of the drawings
Fig. 1 is the first topology diagram of energy accumulation current converter；
Fig. 2 is second of topology diagram of energy accumulation current converter；
Fig. 3 is energy accumulation current converter balance control method flow chart；
Fig. 4 is the Balance route flow chart of energy accumulation current converter debugging mode.
Specific embodiment
Energy accumulation current converter embodiment
The present embodiment provides a kind of energy accumulation current converter, including energy-storage battery group and main circuit topological structure.Wherein, energy storage electricity
Pond group includes at least two energy-storage battery modules, and specific number is set according to actual needs, for any one energy storage
Battery module, the energy-storage battery module can be a single battery, or the electricity being made of at least two single batteries
Pond cluster.Since the structure of battery pack and energy-storage battery module belongs to routine techniques, the present embodiment just no longer to this part into
Row illustrates.
Main circuit topological structure includes AC/DC conversion modules, and the exchange side of AC/DC conversion modules is used to connect alternating current
Net, in the present embodiment, Fig. 1 and Fig. 2 give the circuit structure of two kinds of AC/DC conversion modules, wherein, the AC/DC transformation in Fig. 1
Module is two level AC/DC translation circuits, and as conventional full-bridge circuit, the AC/DC conversion modules in Fig. 2 are three level AC/
DC translation circuits.Wherein, in Fig. 2, AC/DC conversion modules include three bridge arms and a capacitive branch, go here and there and set on each bridge arm
There are the first power module and the second power module, the first power module and the second power module are by two power devices series connection structures
Into each power device is illustrated by taking IGBT as an example.Between the first power module and the second power module on each bridge arm
Tie point for connecting AC network, capacitive branch is arranged on the DC side of the three level AC/DC translation circuits, capacitive branch
In series by the first capacitance module and the second capacitance module, in the present embodiment, each capacitance module is a capacitor, and first
Tie point between capacitance module and the second capacitance module connects the first power module on each bridge arm by diode respectively
In two power devices tie point and the second power module in two power devices tie point.
Main circuit topological structure further includes at least two switch modules, the number of switch module and of energy-storage battery module
Number is identical, and each switch module is corresponded with each energy-storage battery module.For any one switch module, switch module includes
Two control switches are that the first control switch and the second control switch respectively, in the present embodiment, each control switch using IGBT as
Example.N-th of energy-storage battery module is set as Batn, the corresponding switch module of energy-storage battery module be switch module n, the switch
Mould the first control switch in the block is Gn1, the second control switch is Gn2, then, as shown in the figures 1 and 2, energy-storage battery module Bat1
Corresponding control switch G11And G12, energy-storage battery module Bat2, which is corresponded to, controls switch G21And G22... ..., energy-storage battery module Batn
Corresponding control switch Gn1And Gn2.Control switch G12、G22... and Gn2It is arranged in series, forms a series circuit, the series line
Road is connected to the DC side of AC/DC conversion modules, each energy-storage battery module and the corresponding second control switch in parallel connection, that is, stores up
It can battery module Bat1 and control switch G12It is arranged in parallel, energy-storage battery module Bat2 and control switch G22Parallel connection is set
It puts ... ..., energy-storage battery module Batn and control switch Gn2Be arranged in parallel, also, it is each first control switch series be located at it is corresponding
Connecting line road between energy-storage battery module and the corresponding second control switch, further, each first control switch setting
On connecting line road between the anode and the corresponding second control switch of corresponding energy-storage battery module, as shown in the figures 1 and 2,
Control switch G11It is arranged on the anode of energy-storage battery module Bat1 and control switch G12Between connecting line road, control switch
G21It is arranged on the anode of energy-storage battery module Bat2 and control switch G22Between connecting line road ... ..., control switch Gn1If
It puts in the anode of energy-storage battery module Batn and control switch Gn2Between connecting line road.
Therefore, as shown in Figure 1 or 2, each energy-storage battery module is cascaded by corresponding switch module and set, each energy storage electricity
Pond module forms whole group battery pack by this connection mode.By the voltage detecting to each energy-storage battery module and respectively
The control strategy of IGBT switches realizes the dynamic current equalizing control of the battery pack in charge and discharge process, i.e. Balance route.Energy storage unsteady flow
During the normal operation of device, each first control switch is in the conduction state, and each second control switch is off state.
It is needed before the Balance route of the Balance route or discharge process that carry out charging process through corresponding voltage
Detection device detects the voltage of each energy-storage battery module, and calculates average voltage.
The whole realization process of Balance route includes as follows：When the voltage of some energy-storage battery module is more than average voltage
Value, and the error amount of the voltage of the energy-storage battery module and average voltage be more than first setting error amount when, judge energy storage become
Whether stream device is operated in charged state, if energy accumulation current converter is operated in charged state, carries out charge balancing control strategy, is：
The corresponding first control switch of the energy-storage battery module is disconnected, corresponding second control switch is closed, bypasses the energy-storage battery
Module does not charge to the energy-storage battery module；When the voltage of some energy-storage battery module is less than average voltage, and should
When the absolute value of the voltage of energy-storage battery module and the error amount of average voltage is more than the second setting error amount, judge that energy storage becomes
Whether stream device is operated in discharge condition, if energy accumulation current converter is operated in discharge condition, carries out equalization discharge control strategy, is：
The corresponding first control switch of the energy-storage battery module is disconnected, corresponding second control switch is closed, bypasses the energy-storage battery
Module, the energy-storage battery module is without electric discharge.
Based on the basic technical scheme of above-mentioned Balance route, a kind of specific embodiment is given below.
First, as shown in figure 3, determining that energy accumulation current converter is in grid-connected operating mode, sample that (ampling channel number is filled by AD
In the case of foot) or CAN communication mode, the battery terminal voltage of each energy-storage battery module is acquired into control device, and calculate
Its average voltage level.Secondly, it determines that energy accumulation current converter is in operating status, and judges it specifically in standby mode, charging shape
A certain kind in state, discharge condition, records working condition, by the battery terminal voltage of energy-storage battery module and the average electricity of calculating
Pressure is compared.
When the voltage of some energy-storage battery module is more than average voltage, and the voltage and voltage of the energy-storage battery module
When the error amount of average value is more than the first setting error amount, for convenience of description, some energy-storage battery module is with energy storage electricity
For the module Batn of pond, certainly, which is not necessarily energy-storage battery module Batn, but meets above-mentioned criterion
Any one energy-storage battery module.So, when the voltage of energy-storage battery module Batn is more than average voltage, energy storage is calculated
The voltage of battery module Batn and the error amount of average voltage, further, the error amount are difference, then, it calculates
Difference is just positive value, if the difference is more than the first setting error amount, represents that the voltage of energy-storage battery module Batn exceeds voltage
There are many average value, then, it is necessary to battery pack is carried out balanced.Then, if energy accumulation current converter is operated in charged state, into
Row charge balancing control strategy is：Control disconnects control switch Gn1, it is closed control switch Gn2, the switching characteristic based on IGBT,
It needs first to control disconnection control switch Gn1, electric current, which flows through, at this time controls switch Gn1Backward dioded afterflow, switch G to be controlledn1
After being fully disconnected, control conducting control switch Gn2, energy-storage battery module Batn is allowed to be in open-circuit condition, it can not be to energy-storage battery mould
Block Batn charges.Further, it is above-mentioned obtain energy accumulation current converter and be operated in charged state when, first by energy accumulation current converter
Charge power is reduced to 0, then disconnects control switch G according to above-mentioned control process controln1, it is closed control switch Gn2, finally will
Charge power restores to corresponding numerical value, such as command power value.Wherein, charge power can be according to the variation pattern of variable slope
Reduce, can also reduce according to the variation pattern of fixed slope.
In addition, if it is determined that obtaining energy accumulation current converter does not operate at charged state, then, without above-mentioned charge balancing
Control strategy.
During above-mentioned charge balancing control strategy is carried out, stop charging to energy-storage battery module Batn, and
Other energy-storage battery modules charge normal, then, the error between the voltage and average voltage of energy-storage battery module Batn
It is less and less, until the voltage of energy-storage battery module Batn and the difference of average voltage are less than third and set error amount, expression
Gap between the voltage and average voltage of energy-storage battery module Batn is not very big, then, control disconnects control and opens
Close Gn2, it is closed control switch Gn1, restore normal operating condition, exit charge balancing control strategy.With it is above-mentioned similarly, be based on
The switching characteristic of IGBT needs first to control disconnection control switch Gn2, energy-storage battery module Batn, which passes through to control, at this time switchs Gn1's
Backward dioded charges, switch G to be controlledn2After being fully disconnected, control conducting control switch Gn1.Further, it is equal to exit charging
During weighing apparatus control strategy, the charge power of energy accumulation current converter is first reduced to 0, then disconnects and controlling according to above-mentioned control process control
Switch Gn2, it is closed control switch Gn1, finally charge power is restored to corresponding numerical value, such as command power value.Wherein, it fills
Electrical power can reduce according to the variation pattern of variable slope, can also reduce according to the variation pattern of fixed slope.
Certainly, in above-mentioned, the first setting error amount is more than third and sets error amount, the concrete numerical value root of the two setting values
It is set according to actual conditions.
When the voltage of energy-storage battery module Batn is less than average voltage, calculate the voltage of energy-storage battery module Batn with
The difference of average voltage, then, the difference calculated is just negative value, if the absolute value of the difference is more than the second setting error
Value (i.e. the difference is less than a negative setting value) represents that the voltage of energy-storage battery module Batn is many less than average voltage,
So, it is necessary to battery pack be carried out balanced.Then, if energy accumulation current converter is operated in discharge condition, equalization discharge is carried out
Control strategy is：Control disconnects control switch Gn1, it is closed control switch Gn2, the switching characteristic based on IGBT needs first to control
Disconnect control switch Gn1, electric current, which flows through, at this time controls switch Gn1Backward dioded afterflow, switch G to be controlledn1It is fully disconnected
Afterwards, control conducting control switch Gn2, energy-storage battery module Batn is allowed to be in open-circuit condition, energy-storage battery module Batn can not be put
Electricity.Further, it is above-mentioned obtain energy accumulation current converter and be operated in discharge condition when, first the discharge power of energy accumulation current converter is reduced
To 0, then control switch G is disconnected according to above-mentioned control process controln1, it is closed control switch Gn2, finally discharge power is restored
To corresponding numerical value, such as command power value.Wherein, discharge power can reduce according to the variation pattern of variable slope, can also
Reduce according to the variation pattern of fixed slope.
In addition, if it is determined that obtaining energy accumulation current converter does not operate at discharge condition, then, without above-mentioned equalization discharge
Control strategy.
During above-mentioned equalization discharge control strategy is carried out, energy-storage battery module Batn stops electric discharge, and other
Energy-storage battery module regular picture, then, the error between the voltage and average voltage of energy-storage battery module Batn is increasingly
It is small, until the absolute value of the difference of the voltage and average voltage of energy-storage battery module Batn is less than the 4th setting error amount, table
It is not very big to show the gap between the voltage and average voltage of energy-storage battery module Batn, then, control disconnects control
Switch Gn2, it is closed control switch Gn1, restore normal operating condition, exit equalization discharge control strategy.With it is above-mentioned similarly, be based on
The switching characteristic of IGBT needs first to control disconnection control switch Gn2, energy-storage battery module Batn, which passes through to control, at this time switchs Gn1's
Backward dioded charges, switch G to be controlledn2After being fully disconnected, control conducting control switch Gn1.Further, it is equal to exit electric discharge
During weighing apparatus control strategy, the discharge power of energy accumulation current converter is first reduced to 0, then disconnects and controlling according to above-mentioned control process control
Switch Gn2, it is closed control switch Gn1, finally discharge power is restored to corresponding numerical value, such as command power value.Wherein, it puts
Electrical power can reduce according to the variation pattern of variable slope, can also reduce according to the variation pattern of fixed slope.
Certainly, in above-mentioned, the second setting error amount is more than the 4th setting error amount, the concrete numerical value root of the two setting values
It is set according to actual conditions.
Either charge balancing control or equalization discharge control flows efficiency to ensure, electric current when flowing should not mistake
Greatly, if specified power is more than 0.3C, charge power or discharge power are limited in below 0.3C.Moreover, because 2 controls
Switch can cause the positive and negative short circuit of energy-storage battery module when simultaneously turning on, and therefore, the two control switches turn on and off design
Dead zone avoids situation about simultaneously turning on from occurring.
In addition, when battery pack is fed, can a DC chopper circuit be formed by cascade system, to low-voltage into
Row boosting, so as to fulfill the charge function to feeding battery pack.Its operation principle is：Control conducting control switch G11、
G21... and Gn1, disconnect control switch G12、G22... and Gn2.At this point, each energy-storage battery module is connected into major loop,
And the control switch G of energy-storage battery module Bat111Control with energy-storage battery module Batn switchs Gn2One is constituted with series connection
Total voltage is the chopper circuit of battery voltage, and feed battery pack is carried out to realize by controlling the duty ratio of the chopper circuit
Restorative charging.In addition, main circuit topological structure also has zero voltage start-up ability, solves battery pack because serious feed can not
It uses, the drawbacks of need to just being reused by additional charger.
So when energy-storage battery module voltage in allowed limits when, then pass through well-balanced adjustment condition adjudgement energy storage
Whether current transformer is under Balance route strategy.If under Balance route strategy, it is pre- to illustrate that well-balanced adjustment has reached at this time
Phase effect starts to perform the logic for exiting Balance route strategy.Corresponding power is reduced to 0, is then turned off corresponding
Two control switches are closed the first control switch, power are restored to command power value later.If it is not at Balance route strategy
Under, illustrate energy accumulation current converter work at this time in normal state, without processing.
Balance route strategy applies being incorporated into the power networks in pattern in energy accumulation current converter, by judging each energy-storage battery module
Voltage and the difference of average voltage level carry out dynamic equalization control, while debugging mode has also been devised, to meet specific aim
The ability of equalization.As shown in figure 4, debugging mode is independent primarily directed to the unbalanced progress of voltage of specific energy-storage battery module
Charge or discharge isolation, compared with the Balance route strategy in energy accumulation current converter operational process above, purpose is more
By force.But the debugging mode is not belonging to the control model of normal operation, belongs to the control method that debugging initial stage uses.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Energy accumulation current converter main circuit topological structure embodiment
The present embodiment provides a kind of energy accumulation current converter main circuit topological structure, since the topological structure is in above-mentioned energy storage unsteady flow
It has given and has described in detail in device embodiment, the present embodiment just no longer illustrates.
Claims (10)
1. a kind of energy accumulation current converter, including energy-storage battery group and main circuit topological structure, the energy-storage battery group includes at least two
A energy-storage battery module, the main circuit topological structure include AC/DC conversion modules, the exchange side of the AC/DC conversion modules
For connecting AC network, which is characterized in that the main circuit topological structure further includes at least two switch modules, each switching molding
Block is corresponded with each energy-storage battery module, and the switch module includes the first control switch and the second control switchs, each to switch
Second control switch of module is arranged in series to form a series circuit, and the series circuit connects the AC/DC and becomes mold changing
The DC side of block, each energy-storage battery module and corresponding second control switch in parallel connection, each energy-storage battery module with it is corresponding
Connecting line road string between second control switch is equipped with the corresponding first control and switchs.
2. energy accumulation current converter according to claim 1, which is characterized in that the AC/DC conversion modules are three level AC/DC
Translation circuit, the AC/DC conversion modules include three bridge arms and a capacitive branch, and string is equipped with the first power on each bridge arm
Module and the second power module, the first power module and the second power module are made of two power device series connection, each bridge
For connecting AC network, the capacitive branch is set the tie point between the first power module and the second power module on arm
In the DC side of the AC/DC conversion modules, the capacitive branch is in series by the first capacitance module and the second capacitance module,
Tie point between first capacitance module and the second capacitance module connects first on each bridge arm by diode respectively
The tie point of two power devices in the tie point and the second power module of two power devices in power module.
3. a kind of energy accumulation current converter main circuit topological structure, including AC/DC conversion modules, the exchange of the AC/DC conversion modules
Side is used to connect AC network, which is characterized in that the main circuit topological structure further includes at least two switch modules, each to switch
Module is corresponded with each energy-storage battery module, and the switch module includes the first control switch and the second control switchs, and respectively opens
The the second control switch for closing module is arranged in series to form a series circuit, and the series circuit connects the AC/DC transformation
The DC side of module, each second control switch for being connected with corresponding energy-storage battery wired in parallel, use by each first control switch
The connecting line road between corresponding energy-storage battery module and the corresponding second control switch is located in string.
4. energy accumulation current converter main circuit topological structure according to claim 3, which is characterized in that the AC/DC becomes mold changing
Block is three level AC/DC translation circuits, and the AC/DC conversion modules include three bridge arms and a capacitive branch, each bridge arm
Upper string is equipped with the first power module and the second power module, and the first power module and the second power module are by two power devices
In series, the tie point between the first power module and the second power module on each bridge arm is used to connect AC network,
The capacitive branch is arranged on the DC side of the AC/DC conversion modules, and the capacitive branch is by the first capacitance module and second
Capacitance module is in series, and the tie point between first capacitance module and the second capacitance module is connected respectively by diode
Two power devices in the tie point and the second power module of two power devices in the first power module on each bridge arm
The tie point of part.
A kind of 5. energy accumulation current converter balance control method for being exclusively used in energy accumulation current converter described in claim 1, which is characterized in that packet
Include following steps：
(1) voltage of each energy-storage battery module is detected, and calculates average voltage；
(2) when the voltage of some energy-storage battery module is more than average voltage, and the voltage and voltage of the energy-storage battery module
When the error amount of average value is more than the first setting error amount, judge whether energy accumulation current converter is operated in charged state, if energy storage becomes
Stream device is operated in charged state, then carries out charge balancing control strategy, be：Disconnect corresponding first control of the energy-storage battery module
Switch is closed corresponding second control switch, bypasses the energy-storage battery module, do not charge to the energy-storage battery module；
When the voltage of some energy-storage battery module is less than average voltage, and the voltage and average voltage of the energy-storage battery module
When the absolute value of the error amount of value is more than the second setting error amount, judge whether energy accumulation current converter is operated in discharge condition, if storage
Energy current transformer is operated in discharge condition, then carries out equalization discharge control strategy, be：Disconnect the energy-storage battery module corresponding first
Control switch is closed corresponding second control switch, bypasses the energy-storage battery module, the energy-storage battery module is without putting
Electricity.
6. energy accumulation current converter balance control method according to claim 5, which is characterized in that the charge balancing controls plan
In slightly, the charge power of energy accumulation current converter is first reduced to 0, is then turned off the first control switch of corresponding energy-storage battery module,
The second control switch is closed, then restores charge power；In the equalization discharge control strategy, first by the electric discharge of energy accumulation current converter
Power is reduced to 0, is then turned off the first control switch of corresponding energy-storage battery module, is closed the second control switch, then restores
Discharge power.
7. energy accumulation current converter balance control method according to claim 5, which is characterized in that carry out the charge balancing control
During system strategy, the error between the voltage and average voltage of corresponding energy-storage battery module is less and less, when the storage
When the voltage of energy battery module and the error amount of average voltage are less than third setting error amount, the energy-storage battery module pair is disconnected
The the second control switch answered, is closed corresponding first control switch, to exit the charge balancing control strategy, makes the energy storage electric
Pond module recovery normal operating conditions；The first setting error amount is more than the third and sets error amount；
During carrying out the equalization discharge control strategy, between the voltage and average voltage of corresponding energy-storage battery module
Error it is less and less, when the voltage and average voltage of the energy-storage battery module error amount absolute value be less than the 4th setting
During error amount, the corresponding second control switch of the energy-storage battery module is disconnected, corresponding first control switch is closed, to exit
Equalization discharge control strategy is stated, makes the energy-storage battery module recovery normal operating conditions；The second setting error amount is more than institute
State the 4th setting error amount.
8. energy accumulation current converter balance control method according to claim 5, which is characterized in that when battery pack is fed
When, it controls the first of each switch module to control switch conduction, controls the second of each switch module to control switch OFF, the series connection
First control switch of the first switch module on circuit and the second control switch of the last one switch module form battery pack
Chopper circuit, by control the chopper circuit duty ratio realize charge to the battery pack of feed, to restore voltage.
9. energy accumulation current converter balance control method according to claim 7, which is characterized in that exiting the charge balancing
During control strategy, the charge power of energy accumulation current converter is first reduced to 0, is then turned off the second control of corresponding energy-storage battery module
Switch is closed the first control switch, then restores charge power；When exiting the equalization discharge control strategy, first by energy storage
The discharge power of current transformer is reduced to 0, is then turned off the second control switch of corresponding energy-storage battery module, is closed the first control and opens
It closes, then restores discharge power.
10. the energy accumulation current converter balance control method according to claim 6 or 9, which is characterized in that when corresponding power subtracts
It is small to during 0, power is reduced to 0 according to fixed slope.
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