CN108879651A - High-power dual modularization mixed energy storage system and combination method based on DAB - Google Patents
High-power dual modularization mixed energy storage system and combination method based on DAB Download PDFInfo
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- CN108879651A CN108879651A CN201810779329.0A CN201810779329A CN108879651A CN 108879651 A CN108879651 A CN 108879651A CN 201810779329 A CN201810779329 A CN 201810779329A CN 108879651 A CN108879651 A CN 108879651A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
The invention proposes a kind of high-power dual modularization mixed energy storage systems and combination method based on double active bridge (DAB) converters.The hybrid energy-storing unit that is mainly characterized by of the mixed energy storage system carries out modularization to DAB using H bridge as basic unit, changes the combination of H bridge in hybrid energy-storing unit, by disconnecting switch switching to change operating mode.For the DC bus of different voltages grade and power demand, hybrid energy-storing unit module is expanded by input-series and output-parallel (IPOS) and input parallel output (IPOP) two kinds of chain structures in parallel by cascade.The system can not increase converter and energy storage device, energy transmission when realizing off-network inside hybrid energy-storing unit.Which can optimize super capacitor DAB voltage change ratio matching degree in advance, and solution grid-connected front voltage as caused by super capacitor self discharge effect is low, and grid-connected initial voltage no-load voltage ratio matching degree difference bring transducer effciency reduces problem, guarantee that DC bus is stablized.
Description
Technical field：
The present invention relates to direct-current grid hybrid energy-storing fields, specifically a kind of based on double active bridge converters
The high-power modular mixed energy storage system and combination method of (Dual Active Bridge, abbreviation DAB).
Background technique：
With the development of DC micro-electric network technology, the type and quantity of high power load are also increasing, power conversion system
Though system is able to achieve the voltage and power control of direct-current micro-grid, dynamic property is poor, when being unable to satisfy high power load switching
Transient power demand, influence of the high power load switching to system can effectively be mitigated by introducing mixed energy storage system.Hybrid energy-storing
System is usually had complementary advantages by the energy storage device of high-energy density and high power density, such as meets large capacity using lithium battery
The requirement of energy meets instantaneous high power using super capacitor and the Partial Power that can not undertake due to lithium battery power limit
It is required that.Each energy storage device is usually realized the energy between DC bus by bidirectional DC-DC converter respectively in mixed energy storage system
Bi-directional, under large-power occasions, the double active bridge converters for having the advantageous characteristics such as electrical isolation and Sofe Switch become reason
Think one of selection.But double active bridge converters between its end voltage and transformer voltage ratio matching degree it is more demanding, work as electricity
Buckling than matching degree k deviate 1 when, compared with k=1, transmit equal-wattage when switching tube current stress increase, soft-switching range by
Limit, and then lead to the decline of transducer effciency, influence system performance and stabilization.Direct-current micro-grid based on double active bridge converters
In mixed energy storage system, DC bus is usually stable, and lithium battery energy storage battery device end voltage change range is small, electric in charge and discharge process
Press linearity range longer, and usually lithium battery undertakes the function of in emergency circumstances ensureing power supply continuity as backup power supply, capacity
It is larger, it is clear that the voltage change ratio matching degree variation of its converter is smaller；And the usual capacity of super capacitor energy storage device is smaller, end electricity
Press variation range big, and due to self discharge effect, being placed rear end voltage is reduced, in grid-connected preliminary work super capacitor end voltage
Far below optimum operating voltage, the poor efficiency for generating converter of voltage change ratio matching degree, and then influence the performance of system
With stabilization.To solve the problems, such as that super capacitor energy-storage system voltage variation range is big, having scholar is that super capacitor is individually again additional
A set of lithium battery energy storage battery device and converter directly carry out charging/discharging voltage control to super capacitor, substantially increase into
This.Therefore it needs to invent a kind of new mixed energy storage system, solves the problems, such as existing mixed energy storage system, it is mainly super
The voltage change ratio matching degree problem of grade capacitor, to improve the performance of system.
Summary of the invention：
Therefore, the present invention provides a kind of high-power dual modularization mixed energy storage system and combination method based on DAB, is
It is grid-connected preceding since self discharge effect leads to voltage to solve super capacitor energy storage device in the existing mixed energy storage system based on DAB
Far below energy storage side voltage rating, caused by be incorporated to direct-current micro-grid preliminary work converter current stress big, working efficiency it is low this
One technical problem.Technical scheme is as follows：
A kind of high-power dual modularization mixed energy storage system based on double active bridge converters, including DC bus, H
Bridge, disconnecting switch, high frequency transformer and its leakage inductance, lithium battery energy storage battery device, super capacitor energy storage device.
The DC bus realizes pressure stabilizing control by power conversion system；The H bridge is the first molality block, and is kept apart
It closes, high frequency transformer and its leakage inductance integrate active bridge converter in pairs；The lithium battery energy storage battery device, super capacitor energy-storage dress
Set, double active bridge converters are integrated into hybrid energy-storing unit module again, be the second molality block.
In the hybrid energy-storing unit module, there are 4 H bridges, double active bridge converters connect high using H bridge as basic module
Frequency power transformer and its leakage inductance are constituted.In the case where not increasing switching tube, by the switching state of 3 disconnecting switch to different H
Bridge is combined, and realizes the expansion of double active bridge converter quantity in hybrid energy-storing unit.Pass through the high frequency between different H bridges
The transformation of the former secondary side two sides different voltages grade of DAB and the transmission of energy may be implemented in transformer and leakage inductance.
It in the hybrid energy-storing unit module, is made of lithium battery energy storage battery device and super capacitor energy storage device, reaches excellent
The purpose of gesture complementation.The lithium battery energy storage battery device has high-energy density feature, and end voltage change range is small, charge and discharge process
Middle voltage linear section is longer, and usual lithium battery undertakes the function that power supply continuity is in emergency circumstances ensured as backup power supply, holds
It measures larger；The super capacitor has high power density feature, and usual capacity is smaller, and end voltage change range is big, and due to certainly
Discharge effect, being placed rear end voltage reduces, and is far below optimum operating voltage in grid-connected preliminary work super capacitor end voltage, but
A large amount of power can be transmitted moment, meet the Partial Power requirement that lithium battery power limit can not undertake.
The hybrid energy-storing unit module bus bar side positive and negative polarities can be cascaded, according to the voltage class of DC bus and
The power demand of load takes different types of chain type to expand scheme, is integrated into mixed energy storage system, meets input parallel output
Series connection, input parallel output two kinds of power capacities in parallel expand demand.
The case where low-voltage and high-current and bus bar side high voltage low current, then DC bus described in hybrid energy-storing unit module
If grade of rated voltage is higher, shows energy storage side energy storage side and be equivalent to parallel shunt, bus bar side positive and negative anodes take series connection to divide
Chain type expands scheme (IPOS)；If the DC bus voltage rating is lower, energy storage side low-voltage and high-current and bus are showed
The case where side low-voltage and high-current, then hybrid energy-storing unit module energy storage side is equivalent to parallel shunt, and bus bar side positive and negative anodes are taken
Parallel shunt chain type expands scheme (IPOP)；The mixed energy storage system includes m hybrid energy-storing unit module, in each mixing
Under energy-storage units module parameter unanimous circumstances, each hybrid energy-storing unit module power is naturally balanced, can use j-th of hybrid energy-storing
Unit module characterizes single hybrid energy-storing unit module.
The different working modes of the mixed energy storage system include：
MODE0 (mixed energy storage system off-network mode)：Lithium battery energy storage battery device, super capacitor energy storage device are in off-network
State, and energy transmission is not directly carried out between lithium battery energy storage battery device and super capacitor energy storage device；
MODE1 (super capacitor energy storage device off-network charge mode)：Lithium battery energy storage battery device, super capacitor energy storage device are equal
In off-network state, and energy transmission can be directly carried out between lithium battery energy storage battery device and super capacitor energy storage device；
MODE2 (lithium battery energy storage battery device grid-connect mode):Lithium battery energy storage battery device is in grid connection state, super capacitor energy-storage
Device is in off-network state, and energy transmission is not directly carried out between lithium battery energy storage battery device and super capacitor energy storage device；
MODE3 (super capacitor energy storage device is grid-connected to work mode)：Lithium battery energy storage battery device is in off-network state, super electricity
Hold energy storage device and is in grid connection state；And energy is not directly carried out between lithium battery energy storage battery device and super capacitor energy storage device
Transmitting；
MODE4 (mixed energy storage system is grid-connected to work mode)：Lithium battery energy storage battery device, super capacitor energy storage device are in
Grid connection state, and energy transmission is not directly carried out between lithium battery energy storage battery device and super capacitor energy storage device, can between connect
It crosses DC bus and carries out energy transmission.
A kind of combination method of the high-power dual modularization mixed energy storage system based on DAB, includes the following steps：
Step 1, detect whether that there are grid-connected instructions under mixed energy storage system off-network mode；
Step 2, lithium battery energy storage battery device end electricity in j-th of hybrid energy-storing unit module is detected in the mixed energy storage system
Press Ubat_j, bus bar side voltage Ubat_bus_j；Detect super capacitor storage in j-th of hybrid energy-storing unit in the mixed energy storage system
It can device end voltage USC_j, bus bar side voltage USC_bus_j。
Step 3, according to lithium is electric in j-th of hybrid energy-storing unit module in the step 2 detection gained mixed energy storage system
Pond energy storage device end voltage Ubat_j, bus bar side voltage Ubat_bus_jAnd super capacitor energy-storage fills in j-th of hybrid energy-storing unit
Set end voltage USC_j, bus bar side voltage USC_bus_j, calculate connection lithium battery energy storage battery device in j-th of hybrid energy-storing unit module
And the DAB of DC bus2Voltage change ratio matching degree kbat_j, the DAB of super capacitor energy storage device and DC bus3Voltage become
Than matching kSC_j。
Step 4, by j-th of hybrid energy-storing unit module hes in the mixed energy storage system_jIn the double active bridges of lithium battery
The voltage change ratio matching degree k of formula converter modulebat_jBecome with the minimum of the double active bridge converter modules of lithium battery
Than matching degree kbat_workmin_jIt is compared judgement；The voltage change ratio of the double active bridge converter modules of super capacitor is matched again
Spend kSC_jWith the minimum no-load voltage ratio matching degree k of the double active bridge converter modules of lithium batterybat_workmin_jIt is compared and sentences
It is disconnected：
Work as kbat_j< kbat_workmin_jAnd kSC_j≥kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is
MODE0-MODE2-MODE4；
Work as kbat_j< kbat_workmin_jAnd kSC_j< kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is
MODE0-MODE2-MODE1-MODE4；
Work as kbat_j≥kbat_workmin_jAnd kSC_j≥kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is
MODE0-MODE4；
Work as kbat_j≥kbat_workmin_jAnd kSC_j< kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is
MODE0-MODE1-MODE4。
A kind of high-power dual modularization mixed energy storage system and combination method based on DAB of the present invention, with the prior art
It compares, possessed advantage is with beneficial effect：
(1) it is controlled by the switching to disconnecting switch, realizes the combination between different H bridges, do not increasing converter and storage
In the case where energy device quantity, the expansion of double active bridge converter quantity in hybrid energy-storing unit module is realized, and then expand
The working condition of mixed energy storage system.
(2) when the combination method of the mixed energy storage system is able to achieve off-network inside hybrid energy-storing unit module lithium battery with
The energy transmission of super capacitor.
(3) combination method of the mixed energy storage system can realize that its pair has before the grid-connected work of super capacitor energy storage device
The voltage change ratio matching degree of source bridge converter optimizes, and efficiently solves and holds voltage as caused by super capacitor self discharge effect
It reduces, grid-connected preliminary work voltage change ratio matching degree difference bring transducer effciency reduces problem, and then guarantees DC bus
Stablize.
Detailed description of the invention：
Fig. 1 is double active bridge converters and its simplified topological schematic diagram；
Fig. 2 is a kind of structural schematic diagram of the high-power dual modularization mixed energy storage system based on DAB of the present invention；
Fig. 3 is the detailed maps of hybrid energy-storing unit module in the present invention；
Fig. 4 is the detailed maps of mixed energy storage system different working modes in the present invention；
Fig. 5 is the control flow chart of combination method in the present invention.
Appended drawing reference is as follows：1- DC bus；2-H bridge A；3-H bridge B；4-H bridge C；5-H bridge D；6- disconnecting switch；7- high frequency
Transformer and its leakage inductance；8- lithium battery energy storage battery device；9- super capacitor energy storage device；
Specific embodiment：
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing.
Double active bridge converters (DAB) and its simplified topology are as shown in Figure 1, DAB is by two H bridges and a no-load voltage ratio
The high frequency transformer T and its leakage inductance 7 of n is formed, and wherein H bridge in primary side side is by switching tube Q1、Q2、Q3And Q4Composition, secondary side H bridge by
Switching tube Q5、Q6、Q7And Q8Composition.Primary side side voltage is U1, secondary side voltage is U2, primary side side voltage rating is U1_rated,
Secondary side voltage rating is U2_rated, haveThe both end voltage of DAB and the meter of transformer voltage ratio matching degree degree k
Calculating formula isObviously there is k=1 when former secondary side end voltage is voltage rating.
A kind of structural schematic diagram of the high-power dual modularization mixed energy storage system based on double DAB is as shown in Figure 2：Including
DC bus 1, H bridge A2, H bridge B3, H bridge C4, H bridge D5, disconnecting switch 6, high frequency transformer and its leakage inductance 7, lithium battery energy storage battery dress
8 are set, super capacitor energy storage device 9.
The DC bus 1 realizes pressure stabilizing control by power conversion system (PCS)；The H bridge be the first molality block, with every
Pass 6 is left, high frequency transformer and its leakage inductance 7 integrate active bridge converter in pairs；The lithium battery energy storage battery device 8 has high energy
Metric density feature meets the requirement of large capacity energy；The super capacitor energy storage device 9 has high power density feature, can
Moment transmits a large amount of power, meets the Partial Power requirement that lithium battery power limit can not undertake；The lithium battery energy storage battery device
8, super capacitor energy storage device 9, double active bridge converters are integrated into hybrid energy-storing unit module again, are the second molality block.
The hybrid energy-storing unit module detailed structure view is as shown in figure 3, have 4 H bridges, double active bridge converters are with H
Bridge is that basic module connects high frequency transformer and its leakage inductance 7 is constituted, and in the case where not increasing switching tube, can pass through disconnecting switch
6 pairs of difference H bridges are combined, and realize the expansion of double active bridge converter quantity in hybrid energy-storing unit.By different H bridges it
Between high frequency transformer and leakage inductance 7 transformation of the former secondary side two sides different voltages grade of DAB and the transmission of energy may be implemented.
The hybrid energy-storing unit module bus bar side positive and negative polarities can be cascaded, according to the voltage class of DC bus 1
It takes different types of chain type to expand scheme with the power demand of load, is integrated into mixed energy storage system, it is in parallel defeated to meet input
It connects out, input parallel output two kinds of power capacities expansion demand in parallel；The mixed energy storage system can be by hybrid energy-storing
The switching control of disconnecting switch 6, realizes the switching of different working modes in unit module.
If 1 grade of rated voltage of DC bus is higher, energy storage side low-voltage and high-current and the high electricity of bus bar side are showed
The case where pressing low current, then hybrid energy-storing unit module energy storage side is equivalent to parallel shunt, and bus bar side positive and negative anodes take series connection point
Chain type is pressed to expand scheme (IPOS)；If 1 voltage rating of DC bus is lower, energy storage side low-voltage and high-current and mother are showed
The case where line side low-voltage and high-current, then hybrid energy-storing unit module energy storage side is equivalent to parallel shunt, and bus bar side positive and negative anodes are adopted
Parallel shunt chain type is taken to expand scheme (IPOP)；The mixed energy storage system includes m hybrid energy-storing unit module, each mixed
It closes under energy-storage units module parameter unanimous circumstances, each hybrid energy-storing unit module power is naturally balanced, can be stored up with j-th of mixing
Can unit module characterize single hybrid energy-storing unit module.
The detailed maps of the mixed energy storage system different working modes are as shown in figure 4, include：
MODE0 (mixed energy storage system off-network mode)：Lithium battery energy storage battery device 8, super capacitor energy storage device 9 be in from
Net state, and energy transmission is not directly carried out between lithium battery energy storage battery device 8 and super capacitor energy storage device 9；
Specific embodiment is：Disconnecting switch S16、S26、S36 are in off-state, without H in hybrid energy-storing unit module
Bridge and high frequency transformer and its 7 groups of leakage inductance active bridge converters in pairs, as shown in Fig. 4 (a).
MODE1 (9 off-network charge mode of super capacitor energy storage device)：Lithium battery energy storage battery device 8, super capacitor energy storage device
9 are in off-network state, and energy transmission can be directly carried out between lithium battery energy storage battery device 8 and super capacitor energy storage device 9；
Specific embodiment is：Disconnecting switch S16 are in closed state S26、S36 are in an off state, hybrid energy-storing unit
H bridge A2 and H bridge C4 and high frequency transformer T in module1And its leakage inductance 7 is combined into DAB1, lithium battery energy storage battery device 8 is through DAB1To
Super capacitor energy storage device 9 charges, and super capacitor energy storage device 9 is in off-network charged state at this time, as shown in Fig. 4 (b).
MODE2 (8 grid-connect mode of lithium battery energy storage battery device):Lithium battery energy storage battery device 8 is in grid connection state, super capacitor storage
Energy device 9 is in off-network state, and energy is not directly carried out between lithium battery energy storage battery device 8 and super capacitor energy storage device 9
Transmitting；MODE2 includes two kinds of subpatterns again：
The specific embodiment of MODE2_1 (the grid-connected charge mode of lithium battery energy storage battery device 8) is：Disconnecting switch S16 are in
Off-state, S26 are in closed state, S36 are in an off state, the H bridge A2 in hybrid energy-storing unit module and H bridge B3 and height
Frequency power transformer T2And its leakage inductance 7 is combined into DAB2, DC bus 1 is through DAB2K is charged to lithium battery energy storage battery device 8bat_j=1, this
When lithium battery energy storage battery device 8 be in grid-connected charged state, as shown in Fig. 4 (c)；
The specific embodiment of MODE2_2 (lithium battery energy storage battery device is grid-connected to work mode) is：Disconnecting switch S16 in disconnected
Open state, S26 are in closed state, S36 are in an off state, the H bridge A2 in hybrid energy-storing unit module and H bridge B3 and high frequency
Transformer T2And its leakage inductance 7 is combined into DAB2, lithium battery energy storage battery device 8 is through DAB2It is connect with DC bus 1, at any time wait-for-response
Power, the energy requirement of system, lithium battery energy storage battery device 8 is in grid-connected to work state at this time, as shown in Fig. 4 (c)；
MODE3 (super capacitor energy storage device 9 is grid-connected to work mode)：Lithium battery energy storage battery device 8 is in off-network state, super
Capacitive energy storage device 9 is in grid connection state, and between lithium battery energy storage battery device 8 and super capacitor energy storage device 9 not directly into
Row energy transmission；
Specific embodiment is：Disconnecting switch S16 are in an off state, S26 are in an off state, S36 are in closed form
State, H bridge C4 and H bridge D5 and high frequency transformer T in hybrid energy-storing unit module3And its leakage inductance 7 is combined into DAB3, super capacitor
Energy storage device 9 is through DAB3It is connect with DC bus 1, at any time the power, energy requirement of wait-for-response system, super capacitor stores up at this time
Energy device 9 is in grid-connected to work state, as shown in Fig. 4 (d)；
MODE4 (mixed energy storage system is grid-connected to work mode)：Lithium battery energy storage battery device 8, super capacitor energy storage device 9 are located
In grid connection state, and energy transmission is not directly carried out between lithium battery energy storage battery device 8 and super capacitor energy storage device 9, can between
It connected DC bus 1 and carries out energy transmission；
Specific embodiment is：Disconnecting switch S16 are in an off state, S26、S36 are in closed state, hybrid energy-storing
H bridge A2 and H bridge B3 and high frequency transformer T in unit module2And its leakage inductance 7 is combined into DAB2, the warp of lithium battery energy storage battery device 8
DAB2It is connect with DC bus 1, at any time the power energy demand of wait-for-response system, lithium battery energy storage battery device 8 is in simultaneously at this time
Net waits for work state；H bridge C4 and H bridge D5 and high frequency transformer T3And its leakage inductance 7 is combined into DAB3, the warp of super capacitor energy storage device 9
DAB3It is connect with DC bus 1, at any time the power energy demand of wait-for-response system, super capacitor energy storage device 9 is at this time
It is grid-connected to work state, as shown in Fig. 4 (e).
A kind of combination method of the high-power dual modularization mixed energy storage system based on DAB, core concept include：With end
Voltage changes the minimum of little lithium battery energy storage battery device 8 with residual capacity as reference, obtains connection lithium battery
The DAB of energy storage device 8 and DC bus 12Minimum no-load voltage ratio matching degree, it is grid-connected when receiving and as benchmark
When instruction, successively with DAB2、DAB3Real-time voltage no-load voltage ratio matching degree be compared with it, comparison result is as hybrid energy-storing system
The switching foundation of the operating mode of system, and then realize the voltage of super capacitor energy storage device 9 and its grid-connected preliminary work of converter
The optimization of no-load voltage ratio matching degree.The operating mode selection process of control method is as shown in Figure 5 in the present invention.
Include the following steps：
Step 1, detect whether that there are grid-connected instructions under MODE0 (mixed energy storage system off-network mode)；
Step 2, after detecting grid-connected instruction, j-th of hybrid energy-storing unit module in the mixed energy storage system is detected
Middle 8 end voltage U of lithium battery energy storage battery devicebat_j, bus bar side voltage Ubat_bus_j；Detect j-th of mixing in the mixed energy storage system
9 end voltage U of super capacitor energy storage device in energy-storage unitsSC_j, bus bar side voltage USC_bus_j；
Step 3, according to lithium is electric in j-th of hybrid energy-storing unit module in the step 2 detection gained mixed energy storage system
8 end voltage U of pond energy storage devicebat_j, bus bar side voltage Ubat_bus_jAnd super capacitor energy-storage fills in j-th of hybrid energy-storing unit
Set 9 end voltage USC_j, bus bar side voltage USC_bus_j, calculate and connect lithium battery energy storage battery dress in j-th of hybrid energy-storing unit module
Set the DAB of 8 and DC bus 12Voltage change ratio matching degree kbat_j, calculation formula isCalculate connection
The DAB of super capacitor energy storage device 9 and DC bus 13Voltage change ratio match kSC_j, calculation formula is
Step 4, by j-th of hybrid energy-storing unit module hes in the mixed energy storage system_jIn DAB2Voltage change ratio
Matching degree kbat_jWith DAB2Minimum no-load voltage ratio matching degree kbat_workmin_jIt is compared judgement；Due to DC bus 1
Voltage is usually stable at voltage rating, when each hybrid energy-storing unit module parameter is consistent, when power equalization, and IPOS chain type expansion side
Have under case：
Have under IPOP chain type expansion scheme：
Work as kbat_j< kbat_workmin_jWhen, the operating mode of mixed energy storage system is switched to MODE2_1 (lithium battery energy storage battery dress
Set 8 grid-connected charge modes)；Work as kbat_j≥kbat_workmin_jWhen, execute step 5；
Step 5, by j-th of hybrid energy-storing unit module hes in the mixed energy storage system_jMiddle DAB3Voltage change ratio
With degree kSC_jWith DAB2Minimum no-load voltage ratio matching degree kbat_workmin_jIt is compared judgement：
Work as kSC_j< kbat_workmin_jWhen, the operating mode of mixed energy storage system is switched to MODE1 (super capacitor energy-storage dress
Set 9 off-network charge modes)；
Work as kSC_j≥kbat_workmin_jWhen, execute step 6；
Step 6, the operating mode of mixed energy storage system is switched to MODE4 (mixed energy storage system is grid-connected to work mode), and
Net terminates.
In conclusion the present invention is a kind of high-power dual modularization mixed energy storage system and combination method based on DAB,
Both it can be controlled by the switching to disconnecting switch, and realize the combination between different H bridges, do not increasing converter and energy storage device
In the case where quantity, the expansion of double active bridge converter quantity in hybrid energy-storing unit module is realized, and then expanded mixing
The working condition of energy-storage system.Lithium inside hybrid energy-storing unit module when can be able to achieve off-network by this method combination method again
The energy transmission of battery and super capacitor.And its double active bridge can be realized before the grid-connected work of super capacitor energy storage device
The voltage change ratio matching degree of converter optimizes, and efficiently solving the end voltage as caused by super capacitor self discharge effect reduces,
Grid-connected preliminary work voltage change ratio matching degree difference bring transducer effciency reduces problem, and then guarantees the stabilization of DC bus.
Claims (4)
1. a kind of high-power dual modularization mixed energy storage system based on DAB, it is characterised in that including：DC bus, H bridge,
Disconnecting switch, high frequency transformer and its leakage inductance, lithium battery energy storage battery device, super capacitor energy storage device；DC bus connects power
Converting system, load, energy-storage system；The DC bus realizes pressure stabilizing control by power conversion system；The H bridge is the first weight
Module integrates active bridge converter in pairs with disconnecting switch, high frequency transformer and its leakage inductance；The lithium battery energy storage battery device,
Super capacitor energy storage device, double active bridge converters are integrated into hybrid energy-storing unit module again, are the second molality block；It is described mixed
It closing in energy-storage units module, double active bridge converters connect high frequency transformer as basic module using H bridge and its leakage inductance is constituted,
In the case where not increasing switching tube, by controlling the switching of disconnecting switch, different H bridges is combined, realize hybrid energy-storing list
The expansion of double active bridge converter quantity in member；High frequency transformer and its leakage inductance are connected among two H bridges, realize that DAB is former
The transformation of secondary side two sides different voltages grade and the transmission of energy；The lithium battery energy storage battery device, connect with the bus, to
The busbar charging or electric discharge；The super capacitor energy storage device is connect with the bus, to the busbar charging or electric discharge；
The hybrid energy-storing unit module bus bar side positive and negative polarities can be cascaded, according to the function of the voltage class of DC bus and load
Rate demand takes different types of chain type to expand scheme, is integrated into mixed energy storage system；Hybrid energy-storing unit module energy storage side etc.
It imitates in parallel shunt, bus bar side positive and negative anodes take series connection partial pressure chain type expansion scheme or hybrid energy-storing unit module energy storage side equivalent
In parallel shunt, bus bar side positive and negative anodes take parallel shunt chain type to expand scheme；In the mixed energy storage system, primary side side electricity
Pressure is U1, secondary side voltage is U2, primary side side voltage rating is U1_rated, secondary side volume voltage is U2_rated, haveThe both end voltage of DAB and the calculation formula of transformer voltage ratio matching degree degree k areObviously when original
Secondary side end voltage has k=1 when being voltage rating；Lithium battery energy storage battery device end voltage in j-th of hybrid energy-storing unit module
Ubat_j, bus bar side voltage Ubat_bus_jAnd super capacitor energy storage device end voltage U in j-th of hybrid energy-storing unitSC_j, bus
Side voltage USC_bus_j, byIt calculates and connects lithium battery energy storage battery dress in j-th of hybrid energy-storing unit module
It sets and the DAB of DC bus2Voltage change ratio matching degree kbat_j, byCalculate connection super capacitor energy-storage
The DAB of device and DC bus3Voltage change ratio match kSC_j, j-th of hybrid energy-storing unit module hes_jIn DAB2Voltage
No-load voltage ratio matching degree kbat_jWith DAB2Minimum no-load voltage ratio matching degree kbat_workmin_jIt is compared judgement, due to direct current mother
Line voltage is usually stable at voltage rating, and when each hybrid energy-storing unit module parameter is consistent, when power equalization, IPOS chain type is expanded
Have under scheme：
Have under IPOP chain type expansion scheme：
K calculatedbat_workmin_j, kbat_jAnd kSC_jBetween size relation, select corresponding operating mode；The mixing
The different working modes of energy-storage system include：Mixed energy storage system off-network mode：Lithium battery energy storage battery device, super capacitor energy-storage dress
The off-network state that is in is set, and not directly carries out energy transmission between lithium battery energy storage battery device and super capacitor energy storage device；
Super capacitor energy storage device off-network charge mode：Lithium battery energy storage battery device, super capacitor energy storage device are in off-network state, and
Energy transmission can be directly carried out between lithium battery energy storage battery device and super capacitor energy storage device；The grid-connected mould of lithium battery energy storage battery device
Formula：Lithium battery energy storage battery device is in grid connection state, super capacitor energy storage device is in off-network state, and lithium battery energy storage battery device with
Energy transmission is not directly carried out between super capacitor energy storage device；Super capacitor energy storage device is grid-connected to work mode：Lithium battery
Energy storage device is in off-network state, super capacitor energy storage device is in grid connection state, and lithium battery energy storage battery device and super capacitor
Energy storage device not directly carries out energy transmission；Mixed energy storage system is grid-connected to work mode：Lithium battery energy storage battery device, super capacitor
Energy storage device is in grid connection state, and energy is not directly carried out between lithium battery energy storage battery device and super capacitor energy storage device
Transmitting can carry out energy transmission indirectly by DC bus.
2. the high-power dual modularization mixed energy storage system based on DAB as described in claim 1, it is characterised in that：It is described
DC bus realizes pressure stabilizing control by power conversion system；The H bridge is the first molality block, with disconnecting switch, high frequency transformer
And its leakage inductance integrates active bridge converter in pairs；The lithium battery energy storage battery device has high-energy density；The super capacitor
Has high power density；The lithium battery energy storage battery device, super capacitor energy storage device, double active bridge converters are integrated into mixed again
Energy-storage units module is closed, is the second molality block.
3. the high-power dual modularization mixed energy storage system based on DAB as claimed in claim 2, it is characterised in that：It is described
If DC bus grade of rated voltage is higher, the feelings of energy storage side low-voltage and high-current and bus bar side high voltage low current are showed
Condition, then hybrid energy-storing unit module energy storage side is equivalent to parallel shunt, and bus bar side positive and negative anodes take series connection partial pressure chain type expansion side
Case；If the DC bus voltage rating is lower, energy storage side low-voltage and high-current and bus bar side low-voltage and high-current are showed
Situation, then hybrid energy-storing unit module energy storage side is equivalent to parallel shunt, and bus bar side positive and negative anodes take parallel shunt chain type to expand
Scheme；The mixed energy storage system includes m hybrid energy-storing unit module, consistent in each hybrid energy-storing unit module parameter
In the case of, each hybrid energy-storing unit module power is naturally balanced, can characterize single mixing with j-th of hybrid energy-storing unit module
Energy-storage units module.
4. a kind of high-power dual modularization mixed energy storage system and combination method based on DAB is appointed using such as claim 1-3
Mixed energy storage system described in one, it is characterised in that include the following steps：
Step 1, detect whether that there are grid-connected instructions under mixed energy storage system off-network mode；
Step 2, lithium battery energy storage battery device end voltage in j-th of hybrid energy-storing unit module is detected in the mixed energy storage system
Ubat_j, bus bar side voltage Ubat_bus_j；Detect in the mixed energy storage system super capacitor energy-storage in j-th of hybrid energy-storing unit
Device end voltage USC_j, bus bar side voltage USC_bus_j；
Step 3, according to lithium battery stores up in j-th of hybrid energy-storing unit module in the step 2 detection gained mixed energy storage system
It can device end voltage Ubat_j, bus bar side voltage Ubat_bus_jAnd super capacitor energy storage device end in j-th of hybrid energy-storing unit
Voltage USC_j, bus bar side voltage USC_bus_j, calculate and connect lithium battery energy storage battery device and straight in j-th of hybrid energy-storing unit module
Flow the DAB of bus2Voltage change ratio matching degree kbat_j, the DAB of super capacitor energy storage device and DC bus3Voltage change ratio
With kSC_j；
Step 4, by the double active bridge converters of lithium battery in the mixed energy storage system in j-th of hybrid energy-storing unit module
The voltage change ratio matching degree k of modulebat_jWith the minimum no-load voltage ratio matching degree of the double active bridge converter modules of lithium battery
kbat_workmin_jIt is compared judgement；Again by the voltage change ratio matching degree k of the double active bridge converter modules of super capacitorSC_jWith
The minimum no-load voltage ratio matching degree k of the double active bridge converter modules of lithium batterybat_workmin_jIt is compared judgement；
Work as kbat_j< kbat_workmin_jAnd kSC_j≥kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is MODE0-
MODE2-MODE4；
Work as kbat_j< kbat_workmin_jAnd kSC_j< kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is MODE0-
MODE2-MODE1-MODE4；
Work as kbat_j≥kbat_workmin_jAnd kSC_j≥kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is MODE0-
MODE4；
Work as kbat_j≥kbat_workmin_jAnd kSC_j< kbat_workmin_jWhen, the cutting-in control scheme of mixed energy storage system is MODE0-
MODE1-MODE4。
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