CN103762628B - Method of controlling bidirectional converter to charge and discharge storage battery - Google Patents
Method of controlling bidirectional converter to charge and discharge storage battery Download PDFInfo
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- CN103762628B CN103762628B CN201310753187.8A CN201310753187A CN103762628B CN 103762628 B CN103762628 B CN 103762628B CN 201310753187 A CN201310753187 A CN 201310753187A CN 103762628 B CN103762628 B CN 103762628B
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Abstract
Provided is a method of controlling a bidirectional converter to charge and discharge a storage battery. The bidirectional converter adopts a double-loop control method, the inner loop is alternating current loop control, and the outer loop is direct current loop control. The direct current loop control can select direct current voltage outer loop control or direct current outer loop control according to different charging and discharging states of the storage battery; when the storage battery is in a constant current voltage-limiting charging state and a constant current discharging state, the direct current outer loop control and alternating current loop control of the bidirectional converter work simultaneously; when the storage battery is in a constant voltage current-limiting charging state and a floating charging constant-voltage charging state, the direct current voltage outer loop control and alternating current inner loop control of the bidirectional converter work simultaneously; the direct current voltage outer loop control and the direct current outer loop control are switched over smoothly; meanwhile, the bidirectional converter adopts a four-section type intelligent charging control and constant-current discharging control strategy for the storage battery.
Description
Technical field
The present invention relates to a kind of control method of two way convertor to accumulator cell charging and discharging.
Background technology
It is by groups such as various micro- sources, energy storage device, load, protection and supervising devices based on the micro-grid system of distributed power generation
Into small grids, the energy input form of microgrid is varied, due to some regenerative resources such as solar energy, wind energy have it is aobvious
The characteristics of intermittence and randomness of work, and load is also change at random, it is autonomous that distributed energy storage link becomes support microgrid
Run and as the indispensable important component part of controllable networking operation, primarily serve stabilizing system disturbance, maintain to supply
Voltage/frequency stable effect when need to balance and support islet operation.
Two way convertor major function and effect are to realize that the energy between AC network electric energy and energy-storage battery electric energy is double
To transmission, various DC energy storage units, such as ultracapacitor group, accumulator battery, flying wheel battery can be adapted to, it not only can
Fast and effeciently realize stabilizing the fluctuation of the random electric energy of distributed generation system or trend, improve electrical network to extensive renewable energy
Source generates electricity（Wind energy, photovoltaic）Receiving ability, and dispatch command can be received, receive or supplement the peak valley electric energy of electrical network, and carry
For reactive power, to improve the power supply quality and economic benefit of electrical network.
At present, two way convertor adopts full-controlled device to realize that energy in bidirectional flow, power factor be adjustable, reduction is electric mostly
The purpose of stream harmonic wave.However, when the two way convertor of four quadrant running coordinates accumulator to be used for micro-capacitance sensor, there is various running statuses
Need flexibly to take over seamlessly, for example：Constant-voltage charge, constant-current charge, invariable power electric discharge, reactive power support etc..In the urgent need to a kind of system
One control method is realizing above-mentioned functions.
CN 102055368 A《100KVA microgrid energy storage two way convertors》, give 100KVA microgrid energy storage Bidirectional variable-flows
Device is used as the overall structure of product and characteristic, it is proposed that grid-connected four-part form automatic charging (preliminary filling, fill soon, fill, floating charge), but
The control method taken over seamlessly between detailed discharge and recharge each state is not provided.CN 102694388 A《A kind of Bidirectional variable-flow
Device control device》, using the serial structure of ring and alternating current internal ring in the middle of DC voltage outer shroud, DC current, realize whole
Stream, inversion Bidirectional variable-flow are uniformly controlled, but three rings work simultaneously during control, increased control and debugging difficulty, and ring
Answer speed slow, be unfavorable for ensureing voltage stabilizing and the precision of steady current of accumulator cell charging and discharging.CN 101621212 A《Accumulator charges
Control method》A kind of accumulator charging control method is given, using two independent closed loops of output voltage and output current, is handed over
For the output of control charging device, although improve the precision of output voltage and electric current, but also do not specifically give constant pressure, perseverance
Stream mode takes over seamlessly control, while the control to battery discharging does not carry out related introduction.
The content of the invention
The purpose of the present invention is to overcome existing two way convertor to during the control of accumulator cell charging and discharging, can not between each state
Take over seamlessly, and the complicated shortcoming of control strategy, propose a kind of bicyclic control suitable for two way convertor to accumulator cell charging and discharging
Method processed.The present invention according to the difference of accumulator charge and discharge state, using the smooth of DC voltage outer shroud and DC current outer shroud
Changing method, can flexibly switch charge and discharge state, without impact.
Technical scheme is as follows：
Control method of the two way convertor of the present invention to accumulator cell charging and discharging, using a kind of double loop control, internal ring is
Alternating current ring is controlled, and outer shroud is the control of direct current ring.The direct current ring control method can according to the difference of accumulator charging and discharging state,
Two way convertor selects the control of DC voltage outer shroud or the control of DC current outer shroud.When accumulator is in constant-current charge state and perseverance
When banishing electricity condition, the DC current outer shroud control of two way convertor and alternating current internal ring control to work simultaneously.Work as accumulator
In modified constant-voltage charge state when, the control of DC voltage outer shroud and the control of alternating current internal ring of two way convertor simultaneously work
Make.Meanwhile, the two way convertor of the present invention is controlled accumulator using four-part form intelligent charge, when battery tension is relatively low,
First accumulator is charged with a less current value, i.e. trickle charge control；After battery tension gradually builds up, then
Switch to constant-current charge, while limiting battery tension is less than constant-voltage charge voltage threshold, i.e. onstant current voltage limiting to charge,；Work as accumulator
When voltage reaches Isobarically Control value, switch to constant-voltage charge, while DC current values, i.e. constant voltage and current limiting control when limiting constant-voltage charge
System；When DC current is less than floating charging flow valuve, switch to loating charge constant-voltage charge control；During battery discharging, two way convertor is adopted
Use constant-current discharge control strategy.Two way convertor using DC voltage outer shroud and DC current outer shroud by controlling what is taken over seamlessly
Method, can flexibly switch the charge and discharge state of accumulator, without impact, be optimal accumulator charge and discharge control, extend
Life-span of accumulator.
The concrete control method of the present invention is as follows：
When accumulator is in constant-current charge state and constant-current discharge state, the DC current outer shroud control of two way convertor
Control to work simultaneously with alternating current internal ring.In order to prevent DC bus current to fluctuate, the unidirectional current of two way convertor is spread
Sensor collects DC current and carries out Butterworth low pass ripple process, it is ensured that current loop control is stable, and then improves current stabilization essence
Degree.Then current closed-loop computing is carried out again, using the output of DC current ring as the given of alternating current internal ring.
When accumulator is in modified constant-voltage charge state, the DC voltage outer shroud of two way convertor is controlled and alternating current
Internal ring control works simultaneously.In order to prevent DC bus-bar voltage to fluctuate, two way convertor direct current voltage sensor is collected directly
Stream voltage is filtered process, it is ensured that Voltage loop control is stable, and then improves the precision of voltage regulation.Then voltage close loop fortune is carried out again
Calculate, using the output of direct current pressure ring as the given of alternating current internal ring.
Described two way convertor is controlled the four-part form intelligent charge of accumulator, including trickle charge control, constant current are filled
Electric control, constant-voltage charge control and loating charge constant-voltage charge control, two way convertor is using constant-current discharge control during battery discharging
Strategy.Several charge and discharge states of accumulator are contained in control process：Trickle charge state, onstant current voltage limiting to charge, state, perseverance
Pressure current-limiting charge state, loating charge constant-voltage charge state, constant-current discharge state, over-discharge state.
When two way convertor charges a battery, automatically according to DC bus-bar voltage and DC current values, to current storage
Battery judged in which kind of charged state, after state to be charged determines, carries out the given of corresponding voltage or electric current.
Whether the current voltage for judging accumulator first meets trickle charge condition, i.e. DC bus-bar voltage less than battery electricity
Pressure threshold value one, battery voltage threshold one determines that now accumulator voltage is relatively low, such as meets trickle and fill by accumulator self character
Electric condition, then two way convertor control accumulator is into trickle charge state；If the current voltage of accumulator is unsatisfactory for trickle
Charge condition, then judgement of the two way convertor into accumulator onstant current voltage limiting to charge,.
When the current voltage of accumulator meets onstant current voltage limiting to charge, condition, i.e., DC bus-bar voltage is higher than cell voltage threshold
Value one and less than battery voltage threshold two, battery voltage threshold two is also determined by accumulator self character, described cell voltage
Threshold value two is higher than battery voltage threshold one, is the optimum control voltage of accumulator constant-voltage charge, described two way convertor control
Accumulator enters onstant current voltage limiting to charge, state, gives corresponding given value of current or active power value, and carries out constant pressure amplitude limit.If
When the current voltage of accumulator is unsatisfactory for onstant current voltage limiting to charge, condition, then two way convertor enters accumulator modified constant-voltage charge
Judge.It is also full with reference to the state of current accumulator in addition to DC voltage threshold determination in constant-current charge decision condition
When sufficient trickle charge or constant-current discharge, constant-current charge scalariform state can be just entered, be so avoided that because of DC bus-bar voltage fluctuation
Frequent switching between adjacent states is brought, especially state frequent switching problem of the constant-voltage charge to constant-current charge.
When the current voltage of accumulator meets modified constant-voltage charge condition, i.e., DC bus-bar voltage is higher than cell voltage threshold
Value two, then two way convertor control accumulator enters modified constant-voltage charge state, given corresponding voltage set-point, and carries out perseverance
Ductility limit width；If the current voltage of accumulator is unsatisfactory for modified constant-voltage charge condition, two way convertor enters accumulator floating charge
The judgement of constant-voltage charge.In constant-voltage charge decision condition, in addition to DC voltage threshold determination, also to be limited by DC current
System, it is ensured that DC current meets more than accumulator floating charging flow valuve simultaneously, it is to avoid because DC current fluctuation frequently enters floating charge
Constant-voltage charge state.
When the current voltage of accumulator meets loating charge constant-voltage charge condition, i.e., DC current is less than accumulator floating current
It is worth, floating charging flow valuve determines according to accumulator battery behavior, generally the 0.005 of battery rating times, then Bidirectional variable-flow
Device control accumulator enters loating charge constant-voltage charge state；After charging certain hour, charging process terminates, and shows that accumulator is filled
It is full, wait next control instruction.DC voltage output voltage is limited in constant-voltage charge, it is impossible to cut more than the charging of accumulator
Only voltage.
Two way convertor, using constant-current discharge control strategy, gives corresponding given value of current or has battery discharging to when
Work(power set-point, carries out current constant control.
During electric discharge, it is ensured that battery tension is not less than discharge cut-off voltage.Two way convertor real-time detection dc bus electricity
Pressure, when DC bus-bar voltage is slightly above discharge cut-off voltage, discharge cut-off voltage is determined by accumulator self character, then two-way
Current transformer can first do alarming processing, and alarm statuses are passed to into overlayer monitors system, and overlayer monitors system is two way convertor
Upper strata power dispatching system, can carry out interacting for various information between two way convertor, can issue control to two way convertor and refer to
Order, can also obtain the running state information of two way convertor, show that electric discharge is basically completed, if after a period of time, overlayer monitors are sent out
Go out to stop electric discharge instruction, then current transformer stops electric discharge；If not obtaining the stopping electric discharge instruction of overlayer monitors system, dc bus yet
When magnitude of voltage is equal to discharge cut-off voltage, two way convertor exits electric discharge inverter mode, in order to avoid caused put, effective protection electric power storage
The life-span in pond.
The smooth-switching method of DC voltage outer shroud control of the present invention and the control of DC current outer shroud is broadly divided into
Two kinds of situations：
A kind of is the switching controlled from direct current pressure ring to the control of DC current ring：When accumulator is in constant-voltage charge state
Or loating charge constant-voltage charge state, when needing to be transitioned into constant-current charge state, by the defeated of the current DC voltage outer shroud of two way convertor
Go out, namely alternating current internal ring is given, carries out Butterworth low pass ripple process, then product is done with electrical network d shaft voltages, according to
Power conservation principle, by the above results divided by current d-c bus voltage value, calculate the DC current of DC current outer shroud to
Definite value, as the given input of DC current outer shroud after switching.So, when DC current outer shroud is switched to, it is ensured that electric current is given
Surely take over seamlessly.
Another kind is the switching controlled from DC current ring to direct current pressure ring control：When accumulator is in constant-current charge shape
When state is transitioned into constant-voltage charge state, the current DC bus-bar voltage of two way convertor is carried out after Butterworth low pass ripple,
As the DC voltage set-point of direct current pressure ring, while the state of initialization voltage outer shroud, will DC voltage error amount
It is initialized as exchanging the active d shaft currents set-point of internal ring.So, when DC voltage outer shroud is switched to, it is ensured that voltage is given flat
Sliding cutting is changed.
Low pass filter of the present invention is Butterworth lowpass filters, and the selection of cut-off frequency is can filter change
Nearby ripple is target to the switching frequency of stream device.
Description of the drawings
Fig. 1 double -loop control entire block diagrams of the present invention；
Fig. 2 accumulator cell charging and discharging control strategy flow charts；
Fig. 3 accumulator charging and discharging states double -loop control switches schematic diagram.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and detailed description.
As shown in figure 1, double loop control of the present invention is specific as follows：
Battery tension and charge and discharge electric current are respectively by the voltage sensor and current sensor of two way convertor DC side
Measure.Measured battery tension and charge and discharge electric current is low respectively through DC voltage low pass filter 101 and DC current
The Filtering Processing of bandpass filter 102.What AC three-phase voltage, three-phase current were gathered is voltage, the current value of step down side, i.e.,
The voltage of two way convertor side, current value.Three-phase low-voltage side line voltage through three phase static to biphase rotating coordinate transformation,
Obtain dq shaft voltage udAnd uqValue, and through electrical network lock phase processor, electrical network angle, θ is obtained, for participating in SVPWM vector controlleds.
Three-phase current also passes through three phase static to biphase rotating coordinate transformation, obtains dq shaft currents idAnd iqValue, have as charge and discharge
The feedback of work(electric current and reactive current.
Described two way convertor adopts double -loop control mode, internal ring to be controlled to the control of alternating current ring, and outer shroud is controlled to
Direct current ring is controlled, direct current ring control can according to the difference of accumulator charging and discharging state, select the control of DC current outer shroud or
DC voltage outer shroud is controlled.The switching of both hvdc control modes is realized by mode selection switch 105.
When accumulator is in constant-voltage charge state, the control of DC voltage outer shroud and the alternating current internal ring of two way convertor
Control works simultaneously.The input of DC voltage pi regulator is DC voltage set-pointWith DC voltage vdcDifference, should
Difference is used for the control of ac-side current, calculates alternating current internal ring d shaft current set-pointsAs alternating current internal ring
It is given.Wherein DC voltage set-pointBefore into outer shroud pi regulator, need to carry out amplitude limit and slope loading processing；
DC voltage sampled value needs to carry out the process of Butterworth first-order low-pass ripple, filters the high frequency ripple composition in DC voltage.
When accumulator is in constant-current charge or constant-current discharge state, the DC current outer shroud of two way convertor is controlled and handed over
Stream current inner loop control works simultaneously.The input of DC current pi regulator is DC current set-pointWith DC side electric current
idcDifference, the difference be used for ac-side current control.Calculate alternating current internal ring d shaft current set-pointsAs
Alternating current internal ring it is given.Wherein DC current set-pointI.e. charging and discharging currents give, into outer shroud pi regulator
Before, need to carry out amplitude limit and slope loading processing；DC current sampled value idc, i.e. charge and discharge actual current value is also required to carry out
The process of first-order low-pass ripple, filters the high frequency ripple composition in DC current.
By alternating current internal ring d shaft current set-points obtained aboveWith reference to alternating current internal ring q shaft current set-pointsThe value can be obtained by overlayer monitors system, after active, idle amplitude limit, as the given of current inner loop, then could be tied
Actual dq shaft current values are closed, through alternating current internal ring pi regulator, dq shaft voltage values v is obtainedd′、vq', with reference to dq shaft voltages
ud、uq, current decoupled control computing, output control amount vd、vq, three phase static coordinate inverse transformation is rotated to through biphase, controlled
Amount u processedar、ubr、ucr, then modulate through SVPWM, the pwm control signal of two way convertor main circuit IGBT switches is obtained, drive
Move it and realize that two way convertor carries out charge and discharge control to accumulator.
When transition of the battery state of charge to discharge condition, two way convertor need to carry out direct current pressure ring control to
What DC current ring was controlled takes over seamlessly control 103；When accumulator from constant-current charge to constant-voltage charge state and discharge condition to
During charged state transition, two way convertor needs to carry out the control of DC current ring to take over seamlessly control to what direct current pressure ring was controlled
104。
DC voltage outer shroud controls to switch to DC current outer shroud and controls 103 detailed logic and is：By current DC voltage
The output of outer shroud control, namely alternating current internal ring is given, carries out first-order low-pass ripple process, filters high frequency ripple composition,
Do after product with electrical network d shaft voltages, according to power conservation principle, divided by current d-c bus voltage value, calculate DC current
DC current set-point used by outer shroud, as the given input of DC current ring after switching.So, when described Bidirectional variable-flow
When device switches to DC current ring control work, it is ensured that given value of current takes over seamlessly.
DC current outer shroud controls to switch to DC voltage outer shroud and controls 104 detailed logic and is：Current direct current is female
Line voltage is carried out after first-order filtering, as the DC voltage set-point used by direct current pressure ring, while initialization voltage outer shroud
State, will the error amount of DC voltage be initialized as exchanging the active d shaft currents set-point of internal ring.So, when described two-way
When current transformer switches to direct current pressure ring work, it is ensured that voltage is given to be taken over seamlessly.
Detailed accumulator cell charging and discharging control strategy is as shown in Figure 2.As shown in Fig. 2 filling for intelligent accummulator four-part form
Electricity and constant-current discharge control strategy, contain several charge and discharge states of accumulator in control process：Trickle charge state, perseverance
Ductility limit pressure charged state, modified constant-voltage charge state, loating charge constant-voltage charge state, constant-current discharge state, over-discharge state.
When two way convertor charges a battery, automatically according to DC bus-bar voltage and DC current values, to current storage
Battery judged in which kind of charged state, after state to be charged determines, carries out the given of corresponding voltage or electric current.
Whether the current voltage for judging accumulator first meets trickle charge condition, i.e. DC bus-bar voltage less than battery electricity
Pressure threshold value one, such as meets accumulator trickle charge condition, then two way convertor control accumulator enters trickle charge state；If
The current voltage of accumulator is unsatisfactory for trickle charge stage conditions, then two way convertor sentencing into accumulator onstant current voltage limiting to charge,
It is fixed.
When the current voltage of accumulator meets onstant current voltage limiting to charge, condition, i.e., DC bus-bar voltage is higher than cell voltage threshold
Value one and less than battery voltage threshold two, described battery voltage threshold two is higher than battery voltage threshold one, then two way convertor
Control accumulator enters onstant current voltage limiting to charge, state, gives corresponding given value of current or active power set-point, and carries out constant pressure
Amplitude limit；If the current voltage of accumulator is unsatisfactory for onstant current voltage limiting to charge, condition, two way convertor enters accumulator constant pressure
The judgement of current-limiting charge.In constant-current charge decision condition, in addition to DC voltage threshold determination, will also be with reference to current accumulator
State, when accumulator meets trickle charge or constant-current discharge, can just enter constant-current charge state, be so avoided that because directly
Stream voltage pulsation brings frequent switching between adjacent states, especially state frequent switching problem of the constant-voltage charge to constant-current charge.
When the current voltage of accumulator meets modified constant-voltage charge condition, i.e., DC bus-bar voltage is higher than cell voltage threshold
Value two, then two way convertor control accumulator enters modified constant-voltage charge state, given corresponding voltage set-point, and carries out perseverance
Ductility limit width；If the current voltage of accumulator is unsatisfactory for modified constant-voltage charge condition, two way convertor enters accumulator floating charge
The judgement of constant-voltage charge.In accumulator constant-voltage charge decision condition, in addition to DC voltage threshold determination, unidirectional current is also received
The restriction of stream, it is ensured that DC current is simultaneously greater than accumulator floating charging flow valuve, it is to avoid frequently enter because of DC current fluctuation floating
Fill constant-voltage charge state.When the current voltage of accumulator meets loating charge constant-voltage charge condition, i.e., DC current is less than floating charging
Flow valuve, floating charging flow valuve is according to the determination of accumulator battery behavior, generally the 0.005 of battery rating times, then two-way change
Stream device control accumulator enters loating charge constant-voltage charge state；After accumulator charging certain hour, charging process terminates, and shows electric power storage
Pond has been filled with, and waits next control instruction.DC voltage output voltage is limited in accumulator constant-voltage charge no more than storage
The charge cutoff voltage of battery.
Two way convertor, using constant-current discharge control strategy, gives corresponding given value of current or has battery discharging to when
Work(power set-point, carries out current constant control.
During electric discharge, it is ensured that battery tension is not less than discharge cut-off voltage.Two way convertor real-time detection dc bus electricity
Pressure, when DC bus-bar voltage is slightly above discharge cut-off voltage, the threshold value of the discharge cut-off voltage can flexibly set, then two-way change
Stream device can first do alarming processing, and alarm statuses are passed to into overlayer monitors system, show that electric discharge is basically completed.If a period of time
Afterwards, overlayer monitors send stopping electric discharge instruction, then current transformer stops electric discharge；If not obtaining the stopping electric discharge of overlayer monitors system yet
Instruction, when d-c bus voltage value is equal to discharge cut-off voltage, two way convertor exits electric discharge inverter mode, in order to avoid caused
Put, the life-span of effective protection accumulator.
Fig. 3 is accumulator charging and discharging state double -loop control switching schematic diagram.
Transition between several states of accumulator cell charging and discharging is as shown in figure 3, for different charging and discharging states, Bidirectional variable-flow
Device adopts different double -loop control modes.When direct current pressure ring controls to switch to the control of DC current ring, voltage ring cutting is enabled
Change current loop control strategy；When DC current ring controls to switch to the control of DC current ring, electric current loop switching Voltage loop is enabled
Control strategy, finally unifies through alternating current internal ring, and whole process realizes the charge and discharge control of accumulator.
Direct current pressure ring is controlled to the switching control concrete grammar of DC current ring control：When accumulator is filled in constant pressure
Electricity condition or loating charge constant-voltage charge state, when needing to be transitioned into constant-current charge state, by outside the current DC voltage of two way convertor
The output of ring, namely alternating current internal ring is given, carries out Butterworth low pass ripple process, then take advantage of with electrical network d shaft voltages
Product, according to power conservation principle, by the above results divided by current d-c bus voltage value, calculates the direct current of DC current outer shroud
Given value of current value, as the given input of DC current outer shroud after switching.So, when the control of DC current outer shroud is switched to,
Ensure that given value of current takes over seamlessly.
DC current ring is controlled to the concrete grammar of direct current pressure ring control switching：When accumulator is in constant-current charge shape
When state is transitioned into constant-voltage charge state, the current DC bus-bar voltage of two way convertor is carried out after Butterworth low pass ripple,
As the DC voltage set-point of direct current pressure ring, while the state of initialization voltage outer shroud, will DC voltage error amount
It is initialized as exchanging the active d shaft currents set-point of internal ring.So, when the control of DC voltage outer shroud is switched to, it is ensured that voltage is given
Surely take over seamlessly.
Claims (3)
1. a kind of control method of two way convertor to accumulator cell charging and discharging, the two way convertor adopts four-part form to accumulator
Intelligent charge is controlled and constant-current discharge control strategy, meanwhile, described two way convertor adopts bicyclic control to accumulator cell charging and discharging
Method processed, internal ring is the control of alternating current ring, and outer shroud is the control of direct current ring；Described direct current ring control method is filled according to accumulator
The difference of discharge condition, two way convertor selects the control of DC voltage outer shroud or the control of DC current outer shroud：When accumulator is in
When onstant current voltage limiting to charge, state and constant-current discharge state, the control of DC current outer shroud and the alternating current internal ring control of two way convertor
System works simultaneously；When accumulator is in modified constant-voltage charge state, the DC voltage outer shroud of two way convertor is controlled and exchanged
Current inner loop control works simultaneously；The described control of DC voltage outer shroud and the control of DC current outer shroud adopts the side of taking over seamlessly
Method,
Described two way convertor is switched to the logic of DC current outer loop control method (103) from the control of DC voltage outer shroud
For：By the output of current DC voltage outer shroud, namely alternating current internal ring is given, process is filtered, with electrical network d shaft voltages
After doing product, according to power conservation principle, then divided by current d-c bus voltage value, calculate straight used by DC current outer shroud
Stream given value of current value, as the given input of DC current ring after switching so that described two way convertor switches to unidirectional current
During stream ring control work, given value of current takes over seamlessly；Described two way convertor is switched to direct current from the control of DC current outer shroud
The logic of outer voltage control method (104) is：After current DC bus-bar voltage is filtered, as direct current pressure ring institute
DC voltage set-point, while the state of initialization voltage outer shroud, will the error amount of DC voltage be initialized as exchange
The active d shaft currents set-point of internal ring so that when described two way convertor switches to direct current pressure ring to work, voltage is given flat
Sliding cutting is changed.
2. control method of the two way convertor according to claim 1 to accumulator cell charging and discharging, is characterized in that to unidirectional current
The filtering of pressure outer shroud output and the filtering to DC bus-bar voltage use Butterworth lowpass filters.
3. control method of the two way convertor according to claim 1 to accumulator cell charging and discharging, is characterized in that described double
Four-part form intelligent charge control strategy is adopted to accumulator to current transformer to fill for trickle charge control, constant-current charge control, constant pressure
Electric control, and loating charge constant-voltage charge control：
Charging shape when two way convertor charges a battery, according to residing for DC bus-bar voltage and DC current judge accumulator
State, after state to be charged determines, carries out the given of voltage, electric current or power；
Whether the current voltage for judging accumulator first meets trickle charge condition, i.e. DC bus-bar voltage less than battery tension
Threshold value one, such as meets trickle charge condition, and described two way convertor control accumulator enters trickle charge state；If discontented
Sufficient trickle charge condition, then judgement of the described two way convertor into accumulator onstant current voltage limiting to charge,；
When the current voltage of accumulator meets onstant current voltage limiting to charge, condition, i.e., DC bus-bar voltage is higher than battery voltage threshold one
And less than battery tension threshold value two, described battery voltage threshold two is higher than battery voltage threshold one, described Bidirectional variable-flow
Device control accumulator enters onstant current voltage limiting to charge, state, gives corresponding given value of current or active power value, and carries out constant pressure limit
Width；If the current voltage of accumulator is unsatisfactory for onstant current voltage limiting to charge, condition, described two way convertor enters accumulator constant pressure
The judgement of current-limiting charge；In onstant current voltage limiting to charge, decision condition, except judge DC bus-bar voltage threshold value in addition to, will also combine ought
Front battery condition, i.e. accumulator can enter constant-current charge state in when trickle charge or constant-current discharge；
When the current voltage of accumulator meets modified constant-voltage charge condition, i.e., DC bus-bar voltage is higher than battery tension threshold value
Two, described two way convertor control accumulator enters the modified constant-voltage charge stage, gives corresponding voltage set-point, and carries out
Constant current amplitude limit；If the current voltage of accumulator is unsatisfactory for modified constant-voltage charge condition, described two way convertor is entered and stored
The judgement of battery float constant-voltage charge；In accumulator constant-voltage charge decision condition, in addition to judging DC bus-bar voltage threshold value,
Also to ensure that DC current is simultaneously greater than accumulator floating charging flow valuve；
When the current voltage of accumulator meets loating charge constant-voltage charge condition, i.e., DC bus-bar voltage is higher than battery voltage threshold two
And DC current is less than floating charging flow valuve, then described two way convertor control accumulator enters the loating charge constant-voltage charge stage；Fill
Electric process terminates, and shows that accumulator has been filled with, and waits next instruction；Two way convertor DC side electricity is limited in constant voltage charging phase
Charge cutoff voltage of the pressure output voltage no more than accumulator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753187.8A CN103762628B (en) | 2013-12-31 | 2013-12-31 | Method of controlling bidirectional converter to charge and discharge storage battery |
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| CN201310753187.8A CN103762628B (en) | 2013-12-31 | 2013-12-31 | Method of controlling bidirectional converter to charge and discharge storage battery |
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| CN103762628B true CN103762628B (en) | 2017-05-10 |
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| CN106712091B (en) * | 2017-01-20 | 2019-03-08 | 厦门大学 | Straight exchange mixing micro-grid system and its control strategy |
| CN107785972A (en) * | 2017-09-19 | 2018-03-09 | 南京航空航天大学 | A kind of control system and control method of uninterruptible power system rectifier |
| CN108988412A (en) * | 2018-06-20 | 2018-12-11 | 国网江苏省电力有限公司泰州供电分公司 | A kind of accumulator charging and discharging control method |
| CN109217429B (en) * | 2018-10-31 | 2021-04-23 | 西门子工厂自动化工程有限公司 | Method and apparatus for charge and discharge control |
| CN113193606B (en) * | 2020-01-14 | 2022-08-23 | 国创移动能源创新中心(江苏)有限公司 | Charging control circuit and charger |
| CN111969631A (en) * | 2020-09-07 | 2020-11-20 | 广东工业大学 | Energy storage converter and control method thereof |
| CN117937554A (en) * | 2023-12-11 | 2024-04-26 | 江苏百瑞自动化科技有限公司 | Photovoltaic group string side battery energy storage self-adaptive coordination power distribution method |
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| US11855471B2 (en) * | 2020-08-14 | 2023-12-26 | Cirrus Logic Inc. | Power supply architecture with bidirectional battery idealization |
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