CN105576687B - A kind of AC/DC energy storage PCU Power Conditioning Unit and its control method - Google Patents
A kind of AC/DC energy storage PCU Power Conditioning Unit and its control method Download PDFInfo
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Abstract
The present invention announces a kind of AC/DC energy storage PCU Power Conditioning Unit and its control method, including 3n cascaded H-bridges unit, 3n energy-storage units, exchange output interface circuit, direct current output interface circuit and central controller unit；The on off state of exchange output interface circuit AC circuit breaker and direct current output interface circuit dc circuit breaker is controlled by central controller unit, so that energy storage device is operated in energy storage inverter pattern with incoming transport power network, or energy storage DC converter pattern is operated in access direct current network；Central controller unit realizes power bi-directional controllable flow according to the mode of operation of energy storage device using corresponding control strategy.The present invention can be by controlling the different working modes of energy storage device, realize flexible configuration and the management of energy-storage system access alternating current-direct current mixing microgrid, more efficiently utilize conversion of the electric energy between alternating current-direct current bus, power storage, the efficiency of transfer are improved, there is the stability for being easy to improve alternating current-direct current mixing micro-grid system.
Description
Technical field
The present invention relates to technical field of energy storage in micro-grid system, is more particularly that a kind of AC/DC energy storage power is adjusted
Regulating device and its control method.
Background technology
Microgrid as a kind of novel energy networking supply and administrative skill, by distributed generation unit, regenerative resource,
Energy storage device, load, monitor protective system etc. are integrated in one, and can effectively optimize regenerative resource operational management, improve big electricity
Consumption of the net to regenerative resource is horizontal.Microgrid can be divided into exchange microgrid, direct-current micro-grid and alternating current-direct current by its design feature and mix
Microgrid.Wherein, alternating current-direct current mixing microgrid integrates the characteristics of exchange microgrid and direct-current micro-grid, and AC power is in parallel with AC load
In ac bus, dc source and DC load are parallel to dc bus, alternating current-direct current bus is connected by inverter to exchange
Energy.
At present there is AC type distributed generation unit, AC type load, exchange energy storage system in power system transmission ＆ distribution electrical domain
System, once-through type distributed generation unit, once-through type load, once-through type energy-storage units, it is micro- using single exchange microgrid or direct current
Net is difficult to meet power system demand, and alternating current-direct current mixing microgrid, can be fine as a kind of network structure for having both advantages concurrently
Ground adapts to the growth requirement of power system.
Energy-storage system is the pith of microgrid, and its unique bidirectional modulation ability makes the operation of microgrid have bigger spirit
Activity and reliability, seamlessly transitting for process arranged side by side is supported and solves to active/reactive balance of microgrid, economic load dispatching, failure
All have the function that other power supplys are irreplaceable.
Energy storage is respectively configured in the ac bus of alternating current-direct current mixing microgrid and dc bus both sides mostly in currently available technology
System, and energy conversion is carried out by separate PCU Power Conditioning Unit, the method for operation is more single.Exchange microgrid and direct current
Electric energy between microgrid in energy-storage system needs to interconnect inverter progress energy by each independent PCU Power Conditioning Unit and bus
Conversion, the utilization ratio of electric energy is on the one hand reduced, on the other hand reduce the response speed of electric energy conversion.
The content of the invention
The present invention be in order to solve the problems, such as that traditional energy storage PCU Power Conditioning Unit can not meet that alterating and direct current can be changed simultaneously,
A kind of AC/DC energy storage PCU Power Conditioning Unit and its control method are proposed, to be directly connected simultaneously with alternating current-direct current bus
Energy conversion flexibly is realized, realizes flexible configuration and the management of energy-storage system, so as to more efficiently handed over using electric energy
Conversion between dc bus, power storage, the efficiency of transfer are improved, be relatively beneficial to improve the steady of alternating current-direct current mixing micro-grid system
It is qualitative.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of AC/DC energy storage PCU Power Conditioning Unit of the present invention, it is applied in alternating current-direct current mixing microgrid, its feature
It is that the energy storage PCU Power Conditioning Unit includes：Power adjusting main circuit and central controller unit；
The power adjusting main circuit include 3n cascaded H-bridges unit, 3n energy-storage units, exchange output interface circuit and
Direct current output interface circuit；n≥1；1≤i≤n；
The 3n cascaded H-bridges unit includes n a phase cascaded H-bridges units (Ha1~Han), n b phase cascaded H-bridges unit
(Hb1~Hbn) and n c phase cascaded H-bridges units (Hc1~Hcn)；
I-th of a phase cascaded H-bridges unit includes i-th of a phases full-bridge inverter and i-th of a phase filter capacitors (Cai)；
I-th of b phase cascaded H-bridges unit includes i-th of b phases full-bridge inverter and i-th of b phase filter capacitors (Cbi)；
I-th of c phase cascaded H-bridges unit includes i-th of c phases full-bridge inverter and i-th of c phase filter capacitors (Cci)；
The 3n energy-storage units include n a phases energy-storage units, n b phases energy-storage units and n c phase energy-storage units；
I-th of a phase energy-storage units includes：I-th of a phase energy storage devices (Vai) and its series connection i-th of a phase dc circuit breaker
(KDCai)；
I-th of b phase energy-storage units includes：I-th of b phase energy storage devices (Vbi) and its series connection i-th of b phase dc circuit breaker
(KDCbi)；
I-th of c phase energy-storage units includes：I-th of c phase energy storage devices (Vci) and its series connection i-th of c phase dc circuit breaker
(KDCci)；
The exchange output interface circuit includes a cross streams output interface circuit, b cross streams output interface circuit and c phases
Exchange output interface circuit；
The a cross streams output interface circuit includes：A cross streams breakers (KACa) and its series connection a phase frequency inductances
(La)；
The b cross streams output interface circuit includes：B cross streams breakers (KACb) and its series connection b phase frequency inductances
(Lb)；
The c cross streams output interface circuit includes：C cross streams breakers (KACc) and its series connection c phase frequency inductances
(Lc)；
The direct current output interface circuit includes the first direct current output interface circuit, the second direct current output interface circuit, the
Three direct current output interface circuits, the 4th dc circuit breaker (KDC4) and filter capacitor (CDC)；
The first direct current output interface circuit includes：First dc circuit breaker (KDC1) and its series connection the first high-frequency electrical
Feel (L1)；
The second direct current output interface circuit includes：Second dc circuit breaker (KDC2) and its series connection the second high-frequency electrical
Feel (L2)；
The 3rd direct current output interface circuit includes：3rd dc circuit breaker (KDC3) and its series connection the 3rd high-frequency electrical
Feel (L3)；
The side of i-th of a phase full-bridge inverters respectively with a phase filter capacitors (Cai) and i-th of a phases energy-storage units is simultaneously
Connection；
The opposite side of i-th of a phase full-bridge inverters respectively with the i-th -1 a phases full-bridge inverter and i+1 a phases
Full-bridge inverter connect, formed a phase inversion units after, then respectively with the first direct current output interface circuit and a phases
It is in parallel to exchange output interface circuit；
The side of i-th of b phase full-bridge inverters respectively with b phase filter capacitors (Cbi) and i-th of b phases energy-storage units is simultaneously
Connection；
The opposite side of i-th of b phase full-bridge inverters respectively with the i-th -1 b phases full-bridge inverter and i+1 b phases
Full-bridge inverter connect, formed b phase inversion units after, then respectively with the second direct current output interface circuit and the b phases
It is in parallel to exchange output interface circuit；
The side of i-th of c phase full-bridge inverters respectively with c phase filter capacitors (Cci) and i-th of c phases energy-storage units is simultaneously
Connection；
The opposite side of i-th of c phase full-bridge inverters respectively with the i-th -1 c phases full-bridge inverter and i+1 c phases
Full-bridge inverter connect, formed c phase inversion units after, then respectively with the 3rd direct current output interface circuit and the c phases
It is in parallel to exchange output interface circuit；
The a cross streams output interface circuit is connected with a of AC network；
The b cross streams output interface circuit is connected with the b of AC network；
The c cross streams output interface circuit is connected with the c of AC network；
The first direct current output interface circuit, the second direct current output interface circuit, the 3rd direct current output connect
After mouthful circuit and the filter capacitor parallel connection with the 4th dc circuit breaker (KDC4) series connection, then access direct current network both sides；
The central controller unit includes over-sampling modulate circuit, control unit and PWM unit；
The over-sampling modulate circuit gathers the three phase network phase voltage and three tunnel works by exchange output interface circuit respectively
The direct current of DC voltage and three road high-frequency inductor electric currents at frequency inductive current, direct current output interface circuit, 3n energy-storage units
Sampled signal that voltage is formed simultaneously passes to described control unit；
Described control unit is according to a cross streams breaker (KACa), the b cross streams breaker (KACb), the c phases
AC circuit breaker (KACc) and the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker
(KDC3) and the 4th dc circuit breaker (KDC4) on off state judge the mode of operation of the energy storage PCU Power Conditioning Unit be storage
Energy inverter pattern or energy storage DC converter pattern, so as to according to the sampled signal received, utilize energy storage inverter pattern
Strategy or energy storage DC converter pattern strategy obtain pwm control signal, and pass to the PWM unit；
The PWM unit controls the 3n cascaded H-bridges unit to realize that power is changed according to the pwm control signal
Regulation.
The characteristics of AC/DC energy storage PCU Power Conditioning Unit of the present invention, lies also in：
The energy storage device is battery, super capacitor, flywheel or superconducting magnet.
Described control unit is to judge that the mode of operation of energy storage PCU Power Conditioning Unit is energy storage inverter mould as follows
Formula or energy storage DC converter pattern：
As a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure,
And the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th direct current break
Road device (KDC4) disconnect, then it represents that the energy storage PCU Power Conditioning Unit forms energy storage inverter DC/AC structures, described so as to judge
The mode of operation of energy storage PCU Power Conditioning Unit is energy storage inverter pattern；
As a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect,
And the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th direct current break
Road device (KDC4) closure, then it represents that the energy storage PCU Power Conditioning Unit forms energy storage DC converter DC/DC structures, so as to judge
The mode of operation of the energy storage PCU Power Conditioning Unit is energy storage DC converter pattern.
A kind of the characteristics of control method of AC/DC energy storage PCU Power Conditioning Unit of the present invention is to carry out as follows：
Step 1, collection a cross streams breakers (KACa), b cross streams breakers (KACb), c cross streams breakers (KACc) and
First dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) on off state and judged；
If a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure,
And the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th direct current break
Road device (KDC4) disconnect, then it represents that the energy storage PCU Power Conditioning Unit is operated in energy storage inverter pattern, and performs step 2；
If a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect,
And the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th direct current break
Road device (KDC4) closure, then it represents that energy storage PCU Power Conditioning Unit is operated in energy storage DC converter pattern, and performs step 6；
Step 2, a phase phase voltages V for gathering AC networksa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents
ia, b phase inductance electric currents ib, c phase inductance electric currents ic；Gather the voltage V of n a phase energy-storage unitsa1~Van, n b phase energy-storage units
Voltage Vb1~VbnAnd the voltage V of n c phase energy-storage unitsc1~Vcn；
To a phase phase voltages Vsa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents ia, b phase inductance electric currents ib、c
Phase inductance electric current icMake abc/dq coordinate transforms, respectively obtain line voltage d axis components Vsd, q axis components VsqWith power network current d axles
Component id, q axis components iq；
Step 3, using power decoupled control method, give active command P*, reactive command Q*, by formula (1) be calculated to
Determine watt current instruction id *With referenced reactive current iq *：
Step 4, watt current instructed into id *With alternating current current on line side d axis components idDifference, referenced reactive current iq *
With alternating current current on line side q axis components iqDifference, obtained after active reactive current decoupled control cascaded H-bridges unit exchange
The dq axle reference components u of output voltaged、uq；By the dq axles reference component ud、uqPwm signal is obtained through anti-coordinate transform to produce
The modulating wave raw voltage signals U of linkabc *；
Step 5, using carrier phase CPS-SPWM modulator approaches, the tune that pwm signal produces link is calculated by formula (2)
Ripple signal u processedabc：
By gained modulation wave signal uabcAs the sinusoidal modulation wave of n a phase full-bridge inverter, and the n a phases is complete
Modulation wave signal of the sinusoidal modulation wave of bridge inverter as left bridge arm, by the sinusoidal modulation wave of the n a phase full-bridge inverters
180 ° of modulation wave signals as right bridge arm of phase shift；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n b phase full-bridge inverter are lagged, and by the n
Modulation wave signal of the sinusoidal modulation wave of individual b phases full-bridge inverter as left bridge arm, by the n b phases full-bridge inverter just
String modulating wave 180 ° of modulation wave signals as right bridge arm of phase shift；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n c phase full-bridge inverter in advance, and by the n
Modulation wave signal of the sinusoidal modulation wave of individual c phases full-bridge inverter as left bridge arm, by the n c phases full-bridge inverter just
String modulating wave 180 ° of modulation wave signals as right bridge arm of phase shift；
The original triangle carrier signal of a full-bridge inverter is given, and by the original triangle carrier signal phase shift successively
π/n carrier cycle, so as to obtain the triangle carrier signal of n full-bridge inverter, and respectively as n a phase full-bridge inverter
Triangle carrier signal, the triangle carrier signal of n b phase full-bridge inverter and the triangular carrier letter of n c phase full-bridge inverter
Number；
The triangular carrier of the sinusoidal modulation wave of the n a phase full-bridge inverters and the n a phase full-bridge inverters is believed
Number contrasted, obtain the PWM drive signal of n a phase full-bridge inverter；
The triangular carrier of the sinusoidal modulation wave of the n b phase full-bridge inverters and the n b phase full-bridge inverters is believed
Number contrasted, obtain the PWM drive signal of n b phase full-bridge inverter；
The triangular carrier of the sinusoidal modulation wave of the n c phase full-bridge inverters and the n c phase full-bridge inverters is believed
Number contrasted, obtain the PWM drive signal of n c phase full-bridge inverter；
According to the PWM drive signal of the n a phase full-bridge inverters, n b phase full-bridge inverter PWM drive signal and
The PWM drive signal control energy storage inverter power bi-directional controllable flow of n c phase full-bridge inverter；
Step 6, collection direct current network voltage VoWith the first high-frequency inductor electric current iL1, the second high-frequency inductor electric current iL2, the 3rd
High-frequency inductor electric current iL3；Gather the voltage V of n a phase energy-storage unitsa1~Van, n b phase energy-storage units voltage Vb1~VbnWith
And the voltage V of n c phase energy-storage unitsc1~Vcn；
The right bridge arm upper tube of full-bridge inverter is turned off all the time in 3n step 7, control cascaded H-bridges unit, down tube is led all the time
It is logical, so that the n cascaded H-bridges unit output of each phase can be series at direct current network；
Step 8, using control energy-storage system charge-discharge electric power method, give energy-storage system power instruction Pref, according to sampling
Gained DC bus-bar voltage Vo, the charging and discharging currents reference value I of energy-storage system is calculated by formula (3)ref：
Step 9, the charging and discharging currents reference value I by energy-storage systemrefRespectively with the first high-frequency inductor electric current iL1, it is second high
Frequency inductive current iL2, the 3rd high-frequency inductor electric current iL3Compare, the difference obtained obtains 3 paths through PI links respectively
Modulation wave signal；
An original triangular carrier is given, is moved the original triangular carrier successively using three-phase crisscross parallel control mode
The phase of the π of phase 2/3, so as to obtain the triangular carrier of 3 paths；By the triangular carrier of the 3 paths modulating wave with 3 paths respectively
Signal is contrasted, and produces the PWM drive signal of full-bridge inverter, and energy storage DC converter is controlled with the PWM drive signal
Power bi-directional controllable flow.
Compared with the prior art, beneficial effects of the present invention are embodied in：
1st, energy storage PCU Power Conditioning Unit of the present invention enables energy-storage system both to have connected exchange using a set of PCU Power Conditioning Unit
Power network, direct current network is connected again, energy storage PCU Power Conditioning Unit is flexibly controlled according to the service condition of alternating current-direct current mixing micro-grid system
Two kinds of different operational modes of DC/AC inversions or DC/DC DC convertings are operated in, overcoming prior art needs to mix in alternating current-direct current
The problem of ac bus and dc bus both sides separate configurations energy-storage system and corresponding power adjusting means of micro-grid system, realize
The flexible configuration of energy-storage system and management, improve conversion efficiency of the electric energy between alternating current-direct current bus, improve alternating current-direct current and mix
The Stability and dependability of micro-grid system is closed, while reduces cost of investment and installation space, ensure that different operation moulds
Equipment makes full use of under formula.
2nd, the present invention exchanges the circuit breaker switch state of output interface circuit and direct current output interface circuit, control by adjusting
Energy storage PCU Power Conditioning Unit processed flexibly switches between energy storage inverter DC/AC structures and energy storage DC converter DC/DC structures, gram
The problem of conventional power adjusting means method of operation is single has been taken, has realized the variation of the PCU Power Conditioning Unit method of operation；Simultaneously
Basis for estimation by the use of circuit breaker switch state as energy storage PCU Power Conditioning Unit mode of operation, judges energy storage PCU Power Conditioning Unit
Mode of operation be energy storage inverter pattern or energy storage DC converter pattern；Apparatus structure switching method simple and flexible, control
Basis for estimation is intuitive and reliable, improves the applicability and operability of energy storage PCU Power Conditioning Unit.
3rd, the present invention is modulated under energy storage inverter pattern using power decoupled control method and carrier phase CPS-SPWM
Control method of the method as energy storage PCU Power Conditioning Unit；Power decoupled control method is realized to energy storage inverter power output
Quick accurate control；The control of carrier phase CPS-SPWM modulator approaches is simple, can significantly reduce inverter output voltage harmonic wave,
Reduce the requirement to output filter circuit.
4th, the present invention is intersecting using control energy-storage system charge-discharge electric power method and three under energy storage DC converter pattern
Control method of the wrong Parallel Control mode as energy storage PCU Power Conditioning Unit；Control energy-storage system charge-discharge electric power method realizes
Quick accurate control to energy storage DC converter power output, makes energy storage PCU Power Conditioning Unit be applied to stabilize regenerative resource
Fluctuate occasion；Three-phase crisscross parallel control mode reduces output total current ripple, ripple ripple frequency is improved, so as to reduce
Output inductor, the parameter value of electric capacity, be advantageous to improve the dynamic response capability of circuit, improve system effectiveness.
Brief description of the drawings
Fig. 1 is energy storage PCU Power Conditioning Unit structural representation of the present invention；
Fig. 2 is energy storage PCU Power Conditioning Unit energy storage inverter mode of operation topological structure schematic diagram of the present invention；
Fig. 3 is energy storage PCU Power Conditioning Unit energy storage DC converter mode of operation topological structure schematic diagram of the present invention；
Fig. 4 is energy storage PCU Power Conditioning Unit energy storage inverter mode of operation control structure schematic diagram of the present invention；
Fig. 5 is energy storage PCU Power Conditioning Unit energy storage DC converter mode of operation control structure schematic diagram of the present invention.
Embodiment
A kind of AC/DC energy storage PCU Power Conditioning Unit, it is applied in alternating current-direct current mixing microgrid in the present embodiment, it is main
To include power adjusting main circuit and central controller unit；
As shown in figure 1, power adjusting main circuit includes 6 cascaded H-bridges units, 6 energy-storage units, exchange output interface electricity
Road and direct current output interface circuit；1≤i≤2；
6 cascaded H-bridges units include 2 a phase cascaded H-bridges units (Ha1~Ha2), 2 b phase cascaded H-bridges units (Hb1~
Hb2) and 2 c phase cascaded H-bridges units (Hc1~Hc2)；Wherein, i-th of a phase cascaded H-bridges unit includes i-th of a phase full-bridge inverting
Device and i-th of a phase filter capacitors (Cai)；I-th of b phase cascaded H-bridges unit includes i-th of b phases full-bridge inverter and i-th of b phase
Filter capacitor (Cbi)；I-th of c phase cascaded H-bridges unit includes i-th of c phases full-bridge inverter and i-th of c phase filter capacitor
(Cci)；
6 energy-storage units include 2 a phases energy-storage units, 2 b phases energy-storage units and 2 c phase energy-storage units；Wherein, i-th
Individual a phases energy-storage units include：I-th of a phase energy storage devices (Vai) and its series connection i-th of a phase dc circuit breakers (KDCai)；I-th
Individual b phases energy-storage units include：I-th of b phase energy storage devices (Vbi) and its series connection i-th of b phase dc circuit breakers (KDCbi)；I-th
Individual c phases energy-storage units include：I-th of c phase energy storage devices (Vci) and its series connection i-th of c phase dc circuit breakers (KDCci)；Wherein
Energy storage device is battery, super capacitor, flywheel or superconducting magnet；
Exchange output interface circuit includes a cross streams output interface circuit, b cross streams output interface circuit and c cross streams
Output interface circuit；A cross streams output interface circuits include：A cross streams breakers (KACa) and its series connection a phase frequency inductances
(La)；B cross streams output interface circuits include：B cross streams breakers (KACb) and its series connection b phase frequency inductances (Lb)；C intersects
Stream output interface circuit includes：C cross streams breakers (KACc) and its series connection c phase frequency inductances (Lc)；
Direct current output interface circuit includes the first direct current output interface circuit, the second direct current output interface circuit, the 3rd straight
Flow output interface circuit, the 4th dc circuit breaker (KDC4) and filter capacitor (CDC)；First direct current output interface circuit includes：
First dc circuit breaker (KDC1) and its series connection the first high-frequency inductor (L1)；Second direct current output interface circuit includes：Second is straight
Flow breaker (KDC2) and its series connection the second high-frequency inductor (L2)；3rd direct current output interface circuit includes：3rd direct current interruption
Device (KDC3) and its series connection the 3rd high-frequency inductor (L3)；
Whole power adjusting main circuit connects in the following manner：
The side of i-th of a phase full-bridge inverter respectively with a phase filter capacitors (Cai) and i-th of a phases energy-storage units parallel connection；
The opposite side of i-th of a phase full-bridge inverter respectively with the i-th -1 a phases full-bridge inverter and i+1 a phase full-bridge inverter strings
Connection, after forming a phase inversion units, then it is in parallel with the first direct current output interface circuit and a cross streams output interface circuits respectively；
The side of i-th of b phase full-bridge inverter respectively with b phase filter capacitors (Cbi) and i-th of b phases energy-storage units parallel connection；I-th of b phase
The opposite side of full-bridge inverter is connected with the i-th -1 b phases full-bridge inverter and i+1 b phase full-bridge inverters respectively, forms b
After phase inversion unit, then it is in parallel with the second direct current output interface circuit and b cross streams output interface circuits respectively；I-th of c phase
The side of full-bridge inverter respectively with c phase filter capacitors (Cci) and i-th of c phases energy-storage units parallel connection；I-th of c phase full-bridge inverting
The opposite side of device is connected with the i-th -1 c phases full-bridge inverter and i+1 c phase full-bridge inverters respectively, forms c phase inversion lists
After member, then it is in parallel with the 3rd direct current output interface circuit and c cross streams output interface circuits respectively；
A cross streams output interface circuit is connected with a of AC network；B cross streams output interface circuit and AC network
B be connected；C cross streams output interface circuit is connected with the c of AC network；
First direct current output interface circuit, the second direct current output interface circuit, the 3rd direct current output interface circuit and filtering
Electric capacity (CDC) it is in parallel after with the 4th dc circuit breaker (KDC4) series connection, then access direct current network both sides；
Topological structure shown in this implementation, the open circuit of output interface circuit and direct current output interface circuit can be exchanged by adjusting
Device on off state controls energy storage PCU Power Conditioning Unit in energy storage inverter DC/AC structures and energy storage DC converter DC/DC structures
Between flexibly switch, realize energy storage inverter function and energy storage DC converter function concentrate on a set of PCU Power Conditioning Unit, make
Obtain the variation of the PCU Power Conditioning Unit method of operation；Energy-storage units realize distributed operation simultaneously, are easy to energy-storage units to realize balanced
Control, improve the reliability of large-scale energy storage system；Energy-storage units form independent sub-modules with cascaded H-bridges unit, and system can
Modularized design is carried out, is easy to energy-storage system to extend increase-volume.
As shown in figure 1, central controller unit includes over-sampling modulate circuit, control unit and PWM unit；
Over-sampling modulate circuit gathers the three phase network phase voltage (V by exchange output interface circuit respectivelysa、Vsb、Vsc) and
Three road frequency inductance electric current (ia、ib、ic), the DC voltage (V at direct current output interface circuito) and three road high-frequency inductor electric currents
(iL1、iL2、iL3), the DC voltage (V of 6 energy-storage unitsa1、Va2、Vb1、Vb2、Vc1、Vc2) sampled signal that is formed and transmission
To control unit；Control unit is according to a cross streams breakers (KACa), b cross streams breakers (KACb), c cross streams breakers
(KACc) and the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and it is the 4th straight
Flow breaker (KDC4) on off state judge that the mode of operation of energy storage PCU Power Conditioning Unit is that energy storage inverter pattern or energy storage are straight
Current converter pattern, so as to according to the sampled signal received, utilize energy storage inverter pattern strategy or energy storage DC converter
Pattern strategy obtains pwm control signal, and passes to PWM unit；PWM unit controls 6 according to pwm control signal
Cascaded H-bridges unit realizes power conversion regulation.
In the device course of work, control unit judges that the mode of operation of energy storage PCU Power Conditioning Unit is storage as follows
Can inverter pattern or energy storage DC converter pattern：
As a cross streams breakers (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure, and the
One dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) disconnect, then it represents that energy storage PCU Power Conditioning Unit forms energy storage inverter DC/AC structures, as shown in Fig. 2 so as to judge to store up
The mode of operation of energy PCU Power Conditioning Unit is energy storage inverter pattern；
As a cross streams breakers (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect, and the
One dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) closure, then it represents that energy storage PCU Power Conditioning Unit forms energy storage DC converter DC/DC structures, as shown in figure 3, so as to sentence
The mode of operation of disconnected energy storage PCU Power Conditioning Unit is energy storage DC converter pattern.
In the present embodiment, suitable for AC/DC energy storage PCU Power Conditioning Unit control method as shown in Figure 4 and Figure 5,
Fig. 4 is energy storage PCU Power Conditioning Unit energy storage inverter mode of operation control structure schematic diagram, and Fig. 5 stores up for energy storage PCU Power Conditioning Unit
Energy DC converter mode of operation control structure schematic diagram, overall control method are carried out as follows：
Step 1, collection a cross streams breakers (KACa), b cross streams breakers (KACb), c cross streams breakers (KACc) and
First dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) on off state and judged；
If a cross streams breakers (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure, and the
One dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) disconnect, then it represents that energy storage PCU Power Conditioning Unit is operated in energy storage inverter pattern, and performs step 2；
If a cross streams breakers (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect, and the
One dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) closure, then it represents that energy storage PCU Power Conditioning Unit is operated in energy storage DC converter pattern, and performs step 6；
Step 2, a phase phase voltages V for gathering AC networksa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents
ia, b phase inductance electric currents ib, c phase inductance electric currents ic；Gather the voltage V of 2 a phase energy-storage unitsa1、Va2, 2 b phase energy-storage units
Voltage Vb1、Vb2And the voltage V of 2 c phase energy-storage unitsc1、Vc2；
To a phase phase voltages Vsa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents ia, b phase inductance electric currents ib、c
Phase inductance electric current icMake abc/dq coordinate transforms, respectively obtain line voltage d axis components Vsd, q axis components VsqWith power network current d axles
Component id, q axis components iq；
Step 3, cascaded H-bridges energy storage converter normal power control strategy have based on the control of active reactive power decoupled and base
In the individual-phase control of zero-sequence component partition method.It can be realized to the quick of energy storage converter power output based on power decoupled strategy
Accurate control, therefore the present embodiment controls the basic control method as energy storage inverter using power decoupled.
Using power decoupled control method, active command P*, reactive command Q* are given, using line voltage vector oriented,
So that VsqIdentically vanishing, simplify the solution procedure of active reactive electric current.Given watt current instruction id* is calculated by formula (1)
With referenced reactive current iq*：
Step 4, watt current instructed into id *With alternating current current on line side d axis components idDifference, referenced reactive current iq *
With alternating current current on line side q axis components iqDifference, obtained after active reactive current decoupled control cascaded H-bridges unit exchange
The dq axle reference components u of output voltaged、uq；By dq axle reference components ud、uqPwm signal, which is obtained, through anti-coordinate transform produces link
Modulation wave signal Uabc *；
Step 5, the PWM mode of current cascaded H-bridges multi-level converter have ladder pulsewidth modulation, pulse step to adjust
System, multicarrier SPWM modulation, carrier phase CPS-SPWM modulation, space vector SVPWM modulation and sampling SVPWM modulation of staggering the time
Etc. multiple technologies, wherein superior with carrier phase CPS-SPWM modulating performances, control is simple, suitable for modularity control structure,
Therefore in a manner of pulse shaping of the present embodiment using carrier phase CPS-SPWM modulator approaches as energy storage inverter.
Using carrier phase CPS-SPWM modulator approaches, the modulating wave that pwm signal generation link is calculated by formula (2) is believed
Number uabc：
By gained modulation wave signal uabcAs the sinusoidal modulation wave of n a phase full-bridge inverter, and the n a phases is complete
Modulation wave signal of the sinusoidal modulation wave of bridge inverter as left bridge arm, by the sinusoidal modulation wave of the n a phase full-bridge inverters
180 ° of modulation wave signals as right bridge arm of phase shift；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n b phase full-bridge inverter are lagged, and by the n
Modulation wave signal of the sinusoidal modulation wave of individual b phases full-bridge inverter as left bridge arm, by the n b phases full-bridge inverter just
String modulating wave 180 ° of modulation wave signals as right bridge arm of phase shift；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n c phase full-bridge inverter in advance, and by the n
Modulation wave signal of the sinusoidal modulation wave of individual c phases full-bridge inverter as left bridge arm, by the n c phases full-bridge inverter just
String modulating wave 180 ° of modulation wave signals as right bridge arm of phase shift；
The original triangle carrier signal of a full-bridge inverter is given, and by original triangle carrier signal successively phase shift pi/2
Individual carrier cycle, so as to obtain the triangle carrier signal of 2 full-bridge inverters, and respectively as the three of 2 a phase full-bridge inverters
The triangle carrier signal of angle carrier signal, the triangle carrier signal of 2 b phase full-bridge inverters and 2 c phase full-bridge inverters；
The triangle carrier signal of the sinusoidal modulation wave of 2 a phase full-bridge inverters and 2 a phase full-bridge inverters is carried out pair
Than obtaining the PWM drive signal of 2 a phase full-bridge inverters；
The triangle carrier signal of the sinusoidal modulation wave of 2 b phase full-bridge inverters and 2 b phase full-bridge inverters is carried out pair
Than obtaining the PWM drive signal of 2 b phase full-bridge inverters；
The triangle carrier signal of the sinusoidal modulation wave of 2 c phase full-bridge inverters and 2 c phase full-bridge inverters is carried out pair
Than obtaining the PWM drive signal of 2 c phase full-bridge inverters；
According to the PWM drive signal of 2 a phase full-bridge inverters, the PWM drive signal and 2 c of 2 b phase full-bridge inverters
The PWM drive signal control energy storage inverter power bi-directional controllable flow of phase full-bridge inverter；
Step 6, collection direct current network voltage VoWith the first high-frequency inductor electric current iL1, the second high-frequency inductor electric current iL2, the 3rd
High-frequency inductor electric current iL3；Gather the voltage V of 2 a phase energy-storage unitsa1、Va2, 2 b phase energy-storage units voltage Vb1、Vb2And 2
The voltage V of individual c phases energy-storage unitsc1、Vc2；
The right bridge arm upper tube of full-bridge inverter is turned off all the time in 6 step 7, control cascaded H-bridges units, down tube is led all the time
It is logical, so that the 2 cascaded H-bridges unit outputs of each phase can be series at direct current network；
Step 8, using control energy-storage system charge-discharge electric power strategy, give energy-storage system power instruction Pref, according to sampling
Gained DC bus-bar voltage Vo, the charging and discharging currents reference value I of energy-storage system is calculated by formula (3)ref：
Step 9, the charging and discharging currents reference value I by energy-storage systemrefRespectively with the first high-frequency inductor electric current iL1, it is second high
Frequency inductive current iL2, the 3rd high-frequency inductor electric current iL3Compare, the difference obtained obtains 3 paths through PI links respectively
Modulation wave signal；
An original triangular carrier is given, using three-phase crisscross parallel control mode by original triangular carrier successively phase shift 2
The phase of π/3, so as to obtain the triangular carrier of 3 paths.Compared to three-phase synchronous Parallel Control mode, the control of three-phase crisscross parallel
Mode can reduce output total current ripple, improve ripple ripple frequency, so as to reduce the parameter value of output inductor, electric capacity,
Be advantageous to improve the dynamic response capability of circuit, improve system effectiveness；
Modulation wave signal of the triangular carrier of 3 paths respectively with 3 paths is contrasted, produces full-bridge inverter
PWM drive signal, energy storage DC converter power bi-directional controllable flow is controlled with PWM drive signal, available for smooth renewable
Energy output-power fluctuation occasion.
More than, it is only embodiment of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in should all be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection domain of claims.
Claims (3)
1. a kind of AC/DC energy storage PCU Power Conditioning Unit, it is to be applied in alternating current-direct current mixing microgrid, it is characterized in that the storage
Energy PCU Power Conditioning Unit includes：Power adjusting main circuit and central controller unit；
The power adjusting main circuit includes 3n cascaded H-bridges unit, 3n energy-storage units, exchange output interface circuit and direct current
Output interface circuit；n≥1；1≤i≤n；
The 3n cascaded H-bridges unit includes n a phase cascaded H-bridges units (Ha1~Han), n b phase cascaded H-bridges units (Hb1~
Hbn) and n c phase cascaded H-bridges units (Hc1~Hcn)；
I-th of a phase cascaded H-bridges unit includes i-th of a phases full-bridge inverter and i-th of a phase filter capacitors (Cai)；
I-th of b phase cascaded H-bridges unit includes i-th of b phases full-bridge inverter and i-th of b phase filter capacitors (Cbi)；
I-th of c phase cascaded H-bridges unit includes i-th of c phases full-bridge inverter and i-th of c phase filter capacitors (Cci)；
The 3n energy-storage units include n a phases energy-storage units, n b phases energy-storage units and n c phase energy-storage units；
I-th of a phase energy-storage units includes：I-th of a phase energy storage devices (Vai) and its series connection i-th of a phase dc circuit breaker
(KDCai)；
I-th of b phase energy-storage units includes：I-th of b phase energy storage devices (Vbi) and its series connection i-th of b phase dc circuit breaker
(KDCbi)；
I-th of c phase energy-storage units includes：I-th of c phase energy storage devices (Vci) and its series connection i-th of c phase dc circuit breaker
(KDCci)；
The exchange output interface circuit includes a cross streams output interface circuit, b cross streams output interface circuit and c cross streams
Output interface circuit；
The a cross streams output interface circuit includes：A cross streams breakers (KACa) and its series connection a phase frequency inductances (La)；
The b cross streams output interface circuit includes：B cross streams breakers (KACb) and its series connection b phase frequency inductances (Lb)；
The c cross streams output interface circuit includes：C cross streams breakers (KACc) and its series connection c phase frequency inductances (Lc)；
The direct current output interface circuit includes the first direct current output interface circuit, the second direct current output interface circuit, the 3rd straight
Flow output interface circuit, the 4th dc circuit breaker (KDC4) and filter capacitor (CDC)；
The first direct current output interface circuit includes：First dc circuit breaker (KDC1) and its series connection the first high-frequency inductor
(L1)；
The second direct current output interface circuit includes：Second dc circuit breaker (KDC2) and its series connection the second high-frequency inductor
(L2)；
The 3rd direct current output interface circuit includes：3rd dc circuit breaker (KDC3) and its series connection the 3rd high-frequency inductor
(L3)；
The side of i-th of a phase full-bridge inverters respectively with a phase filter capacitors (Cai) and i-th of a phases energy-storage units parallel connection；
The opposite side of i-th of a phase full-bridge inverters respectively with the i-th -1 a phases full-bridge inverter and i+1 a phase full-bridges
Inverter connect, formed a phase inversion units after, then respectively with the first direct current output interface circuit and a cross streams
Output interface circuit is in parallel；
The side of i-th of b phase full-bridge inverters respectively with b phase filter capacitors (Cbi) and i-th of b phases energy-storage units parallel connection；
The opposite side of i-th of b phase full-bridge inverters respectively with the i-th -1 b phases full-bridge inverter and i+1 b phase full-bridges
Inverter connect, formed b phase inversion units after, then respectively with the second direct current output interface circuit and the b cross streams
Output interface circuit is in parallel；
The side of i-th of c phase full-bridge inverters respectively with c phase filter capacitors (Cci) and i-th of c phases energy-storage units parallel connection；
The opposite side of i-th of c phase full-bridge inverters respectively with the i-th -1 c phases full-bridge inverter and i+1 c phase full-bridges
Inverter connect, formed c phase inversion units after, then respectively with the 3rd direct current output interface circuit and the c cross streams
Output interface circuit is in parallel；
The a cross streams output interface circuit is connected with a of AC network；
The b cross streams output interface circuit is connected with the b of AC network；
The c cross streams output interface circuit is connected with the c of AC network；
The first direct current output interface circuit, the second direct current output interface circuit, the 3rd direct current output interface electricity
Behind road and the filter capacitor parallel connection with the 4th dc circuit breaker (KDC4) series connection, then access direct current network both sides；
The central controller unit includes over-sampling modulate circuit, control unit and PWM unit；
The over-sampling modulate circuit gathers the three phase network phase voltage and three tunnel power frequency electrics by exchange output interface circuit respectively
The DC voltage of DC voltage and three road high-frequency inductor electric currents at inducing current, direct current output interface circuit, 3n energy-storage units
The sampled signal that is formed simultaneously passes to described control unit；
Described control unit is according to a cross streams breaker (KACa), the b cross streams breaker (KACb), the c cross streams
Breaker (KACc) and the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3)
And the 4th dc circuit breaker (KDC4) on off state judge that the mode of operation of the energy storage PCU Power Conditioning Unit is energy storage inversion
Device pattern or energy storage DC converter pattern, so as to according to the sampled signal received, using energy storage inverter pattern strategy or
Energy storage DC converter pattern strategy obtains pwm control signal, and passes to the PWM unit；
The PWM unit controls the 3n cascaded H-bridges unit to realize that power conversion is adjusted according to the pwm control signal
Section；
Described control unit be judge as follows energy storage PCU Power Conditioning Unit mode of operation be energy storage inverter pattern or
Energy storage DC converter pattern：
As a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure, and institute
State the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) disconnect, then it represents that the energy storage PCU Power Conditioning Unit forms energy storage inverter DC/AC structures, so as to judge the energy storage
The mode of operation of PCU Power Conditioning Unit is energy storage inverter pattern；
As a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect, and institute
State the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) closure, then it represents that the energy storage PCU Power Conditioning Unit forms energy storage DC converter DC/DC structures, described so as to judge
The mode of operation of energy storage PCU Power Conditioning Unit is energy storage DC converter pattern.
2. AC/DC energy storage PCU Power Conditioning Unit according to claim 1, it is characterised in that：The energy storage device is
Battery, super capacitor, flywheel or superconducting magnet.
3. a kind of control method of AC/DC energy storage PCU Power Conditioning Unit according to claim 1 or 2, it is characterized in that
Carry out as follows：
Step 1, collection a cross streams breakers (KACa), b cross streams breakers (KACb), c cross streams breakers (KACc) and first
Dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) on off state and judged；
If a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) closure, and institute
State the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) disconnect, then it represents that the energy storage PCU Power Conditioning Unit is operated in energy storage inverter pattern, and performs step 2；
If a cross streams breaker (KACa), b cross streams breakers (KACb) and c cross streams breakers (KACc) disconnect, and institute
State the first dc circuit breaker (KDC1), the second dc circuit breaker (KDC2), the 3rd dc circuit breaker (KDC3) and the 4th dc circuit breaker
(KDC4) closure, then it represents that energy storage PCU Power Conditioning Unit is operated in energy storage DC converter pattern, and performs step 6；
Step 2, a phase phase voltages V for gathering AC networksa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents ia、b
Phase inductance electric current ib, c phase inductance electric currents ic；Gather the voltage V of n a phase energy-storage unitsa1~Van, n b phase energy-storage units electricity
Press Vb1~VbnAnd the voltage V of n c phase energy-storage unitsc1~Vcn；
To a phase phase voltages Vsa, b phase phase voltages Vsb, c phase phase voltages VscWith a phase inductance electric currents ia, b phase inductance electric currents ib, c phases electricity
Inducing current icMake abc/dq coordinate transforms, respectively obtain line voltage d axis components Vsd, q axis components VsqWith power network current d axis components
id, q axis components iq；
Step 3, using power decoupled control method, give active command P*, reactive command Q*, being calculated to give by formula (1) has
Work(current-order id *With referenced reactive current iq *：
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Step 4, watt current instructed into id *With alternating current current on line side d axis components idDifference, referenced reactive current iq *And friendship
Flow grid side electric current q axis components iqDifference, obtained after active reactive current decoupled control cascaded H-bridges unit exchange output
The dq axle reference components u of voltaged、uq；By the dq axles reference component ud、uqPwm signal, which is obtained, through anti-coordinate transform produces link
Modulating wave raw voltage signals Uabc *；
Step 5, using carrier phase CPS-SPWM modulator approaches, the modulating wave that pwm signal produces link is calculated by formula (2)
Signal uabc：
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By gained modulation wave signal uabcAs the sinusoidal modulation wave of n a phase full-bridge inverter, and the n a phase full-bridges is inverse
Become modulation wave signal of the sinusoidal modulation wave of device as left bridge arm, by the sinusoidal modulation wave phase shift of the n a phase full-bridge inverters
180 ° of modulation wave signals as right bridge arm；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n b phase full-bridge inverter are lagged, and by the n b
Modulation wave signal of the sinusoidal modulation wave of phase full-bridge inverter as left bridge arm, the sine of the n b phase full-bridge inverters is adjusted
180 ° of modulation wave signals as right bridge arm of ripple phase shift processed；
By gained modulation wave signal uabc120 ° of sinusoidal modulation waves as n c phase full-bridge inverter in advance, and by the n c
Modulation wave signal of the sinusoidal modulation wave of phase full-bridge inverter as left bridge arm, the sine of the n c phase full-bridge inverters is adjusted
180 ° of modulation wave signals as right bridge arm of ripple phase shift processed；
The original triangle carrier signal of a full-bridge inverter is given, and by the original triangle carrier signal successively phase shift π/n
Individual carrier cycle, so as to obtain the triangle carrier signal of n full-bridge inverter, and respectively as the three of n a phase full-bridge inverter
The triangle carrier signal of angle carrier signal, the triangle carrier signal of n b phase full-bridge inverter and n c phase full-bridge inverter；
The triangle carrier signal of the sinusoidal modulation wave of the n a phase full-bridge inverters and the n a phase full-bridge inverters is entered
Row contrast, obtains the PWM drive signal of n a phase full-bridge inverter；
The triangle carrier signal of the sinusoidal modulation wave of the n b phase full-bridge inverters and the n b phase full-bridge inverters is entered
Row contrast, obtains the PWM drive signal of n b phase full-bridge inverter；
The triangle carrier signal of the sinusoidal modulation wave of the n c phase full-bridge inverters and the n c phase full-bridge inverters is entered
Row contrast, obtains the PWM drive signal of n c phase full-bridge inverter；
According to the PWM drive signal of the n a phase full-bridge inverters, the PWM drive signal and n c of n b phase full-bridge inverter
The PWM drive signal control energy storage inverter power bi-directional controllable flow of phase full-bridge inverter；
Step 6, collection direct current network voltage VoWith the first high-frequency inductor electric current iL1, the second high-frequency inductor electric current iL2, the 3rd high frequency
Inductive current iL3；Gather the voltage V of n a phase energy-storage unitsa1~Van, n b phase energy-storage units voltage Vb1~VbnAnd n
The voltage V of c phase energy-storage unitsc1~Vcn；
The right bridge arm upper tube of full-bridge inverter turns off all the time in 3n step 7, control cascaded H-bridges unit, down tube turns on all the time, from
And each n cascaded H-bridges unit output of phase is caused to be series at direct current network；
Step 8, using control energy-storage system charge-discharge electric power method, give energy-storage system power instruction Pref, according to sampling gained
DC bus-bar voltage Vo, the charging and discharging currents reference value I of energy-storage system is calculated by formula (3)ref：
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Step 9, the charging and discharging currents reference value I by energy-storage systemrefRespectively with the first high-frequency inductor electric current iL1, the second high-frequency electrical
Inducing current iL2, the 3rd high-frequency inductor electric current iL3Compare, the difference obtained obtains the modulation of 3 paths through PI links respectively
Ripple signal；
An original triangular carrier is given, using three-phase crisscross parallel control mode by the original triangular carrier successively phase shift 2
The phase of π/3, so as to obtain the triangular carrier of 3 paths；Modulating wave of the triangular carrier of 3 paths respectively with 3 paths is believed
Number contrasted, produce the PWM drive signal of full-bridge inverter, energy storage DC converter work(is controlled with the PWM drive signal
The two-way controllable flow of rate.
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| CN107026474B (en) * | 2017-05-12 | 2019-10-11 | 合肥工业大学 | Reduce the Power balance control method of cascaded H-bridges inverter direct-current voltage fluctuation |
| CN108400607A (en) * | 2018-01-19 | 2018-08-14 | 许继电源有限公司 | A kind of power grid energy-storage system and its energy storage device balance control method |
| CN115021302B (en) * | 2022-08-09 | 2022-11-22 | 四川大学 | Control method of megawatt hybrid energy storage device with electric energy quality regulation function |
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| JPH0746771A (en) * | 1993-07-30 | 1995-02-14 | Technical Asoshieeto:Kk | Automatic charger |
| CN103208920B (en) * | 2012-01-13 | 2016-06-22 | 三垦电气株式会社 | DC converter |
| CN204947739U (en) * | 2015-09-23 | 2016-01-06 | 山东圣阳电源股份有限公司 | A kind of tandem type battery energy storage system |
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