CN108199380A - A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor - Google Patents
A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor Download PDFInfo
- Publication number
- CN108199380A CN108199380A CN201810098533.6A CN201810098533A CN108199380A CN 108199380 A CN108199380 A CN 108199380A CN 201810098533 A CN201810098533 A CN 201810098533A CN 108199380 A CN108199380 A CN 108199380A
- Authority
- CN
- China
- Prior art keywords
- direct current
- microgrid
- power
- sub
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to the busbar voltage stability techniques of alternating current-direct current mixing micro-capacitance sensor, more particularly to a kind of control method of the two-way DC AC converters suitable for alternating current-direct current mixing micro-capacitance sensor, for there is unbalanced power in alternating current-direct current mixing micro-capacitance sensor, zonal control is carried out to voltage fluctuation；It is divided into off-network and grid-connected two states, and under net state, subregion is carried out according to DC bus-bar voltage deviation, different sagging slopes then is used to different sections；Under off-network state, consider to exchange the energy supply of sub- microgrid and the sub- microgrid of direct current, load consumption selection operating mode, while using the droop control of multi slope；To realize the subregion curve dynamic droop control of alternating current-direct current mixing micro-capacitance sensor.This control method provides control method of the DC AC converters two-way in alternating current-direct current mixing micro-capacitance sensor under different conditions, using multi slope sagging curve, close to true sagging curve, ensure the control accuracy of micro-capacitance sensor.
Description
Technical field
Busbar voltage stability Design technical field more particularly to one kind the invention belongs to alternating current-direct current mixing micro-capacitance sensor is suitable
For the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor.
Background technology
China faces energy transition demand, to realize energy transition, improves the permeability of regenerative resource, a wide range of popularization
Distributed power generation, a more feasible scheme of can yet be regarded as.Meanwhile with the development of science and technology, a large amount of direct-flow electricity utilization apparatus
It is flourishing, using supplied by AC/DC electricity system, can both meet the exchange power demand of user, the straight of user can also be met
Stream load, while loss of the energy during AC-DC conversion can be reduced.Alternating current-direct current mixing micro-capacitance sensor turns in Chinese energy
It in the type stage, gathers around and holds out broad prospects.
Alternating current-direct current mixing micro-capacitance sensor compared to direct-current grid with exchange microgrid, both comprising common photovoltaic generation unit,
Also include batteries to store energy unit and alternating current generator.The stable operation of mixing micro-capacitance sensor is maintained, not only needs to maintain direct current female
The voltage stabilization of line but also to maintain ac bus voltage stabilization.It is two-way to ensure alternating current-direct current mixing micro-capacitance sensor stable operation
DC-AC converters need the two-way flow for meeting power, the i.e. useful two kinds of operating modes of reversible transducer：Inverter mode and rectification
Pattern ensures micro-capacitance sensor exchange side and power balance of DC side with this.
The DC-AC converters suitable for micro-capacitance sensor at present belong to the inverter of energy one-way flow, i.e., by DC side mostly
Power is delivered to AC network after inversion, and for the two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor
It studies less.
In the micro-grid system for possessing mostly micro- source, DC-AC converters are relatively conventional using droop control.It is exchanging
Side, active and frequency dependence are idle related to voltage；In DC side, since there is no reactive power, voltage to it is active related.
Under grid-connected conditions, the exchange subnet in alternating current-direct current mixing micro-capacitance sensor directly links with public electric wire net, and electricity is supported by public electric wire net
Pressure and frequency to maintain the stable operation of mixing micro-capacitance sensor, need to only ensure the voltage stabilization of dc bus in direct current subnet.From
Under the conditions of net, since micro-capacitance sensor loses the support of public electric wire net, micro- source in subnet and DC-AC converters are exchanged, needs basis
Voltage and frequency adjustment on ac bus are contributed.
In alternating current-direct current mixing micro-capacitance sensor, capacitor charge and discharge is usually used to realize stabilizing for power swing, but it is electric
The power swing of appearance and voltage fluctuation are not in a linear relationship.Therefore there is traditional sagging curve using fixed slope and electricity
Hold the nonsynchronous problem of charging and discharging curve.
Invention content
The object of the present invention is to provide a kind of multi slope droop controls, to ensure micro-capacitance sensor control accuracy, maintain alternating current-direct current
The method for mixing micro-capacitance sensor steady operation.
To achieve the above object, the technical solution adopted by the present invention is：A kind of pair suitable for alternating current-direct current mixing micro-capacitance sensor
To the control method of DC-AC converters, for there is unbalanced power in alternating current-direct current mixing micro-capacitance sensor, to voltage fluctuation reality
Row zonal control；It is divided into off-network and grid-connected two states, and under net state, subregion is carried out according to DC bus-bar voltage deviation,
Then different sagging slopes is used to different sections；Under off-network state, consider to exchange the energy of sub- microgrid and the sub- microgrid of direct current
Amount supply, load consumption selection operating mode, while using the droop control of multi slope；To realize alternating current-direct current mixing micro-capacitance sensor
Subregion curve dynamic droop control.
Above-mentioned suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor, the control
Method includes the following steps：
Step 1 judges that micro-capacitance sensor is in simultaneously net state or off-network shape according to the sensor unit of two-way DC-AC converters
State；
Step 2 judges stable state under micro-grid connection state by the sub- microgrid stable condition of direct current；Pass through direct current
Microgrid judges stable state under micro-capacitance sensor off-network state with sub- microgrid stable condition is exchanged；
Step 3, respectively determine and net state under and off-network state under two-way DC-AC converters operating mode, selection pair
The sagging coefficient answered；
Step 4, the operating mode that grid-connected or off-network state obtained by step 1, step 3 are determined and selected sagging coefficient
As the reference signal input control unit of controller, into current controller and SPWM controllers, output PWM wave control switch
The break-make of pipe by controlling two-way DC-AC converters, realizes the control to alternating current-direct current mixing micro-capacitance sensor.
Above-mentioned suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor, and net state
The judgement of the sub- microgrid stable condition of direct current, the selection of the determining and sagging coefficient of operating mode include：
1), the Rule of judgment that the sub- microgrid of direct current is stablized, according to the restriction relation of DC bus-bar voltage in micro-capacitance sensor and power,
Set threshold voltage UH1And UL1, DC bus-bar voltage rated value Uref, dc bus virtual voltage U, virtual voltage and specified electricity
The deviation of pressure is Δ U=U-UrefIf Δ U>0, the sub- microgrid power surplus of direct current；If Δ U<0, then the sub- microgrid of direct current power occurs
Vacancy；
2) it, divides operating mode and selects sagging coefficient, subregion, Δ U are carried out according to DC bus-bar voltage<When 0, two-way DC-
AC converters work in rectification mode；ΔU>When 0, two-way DC-AC converters work in inverter mode；Work as U<UL1Or U>UH1When,
Select sagging factor beta；Work as UL1<U<UH1When, the sagging coefficient used is α.
Above-mentioned suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor, off-network state
The sub- microgrid of direct current with exchange the judgement of sub- microgrid stable condition, operating mode determine and the selection of sagging coefficient includes：
(1), the same step 1) of judgement of the sub- microgrid stable condition of direct current；The judgement of sub- microgrid stable condition is exchanged then according to friendship
Constraints P-f, Q-U present in sub- microgrid is flowed, as the active-power P that micro- source provides increases, electric voltage frequency f can rise；
The reactive power that micro- source provides increases, then voltage UacIt can increase；
(2), operating mode is determined, whenWhen, the output power in each micro- source of reduction；WhenTwo-way DC-AC converters work in rectification mode；When
Two-way DC-AC converters are operated in inverter mode；When It then needs to consider that cut-out is born
It carries；Active, P is consumed for exchange lateral loadacIt is provided for the sub- microgrid of exchange active；PdcFor the sub- microgrid institute of direct current
The active power that can be provided；For DC side load consuming power；
(3), sagging coefficient is selected, the droop characteristic equation for exchanging the constraints P-f and Q-U of sub- microgrid is：
In formula f be ac bus electric voltage frequency, fnFor rated frequency, P 'acTo exchange sub- microgrid output power, PnFor exchange
Sub- microgrid exports rated power,UacFor voltage value on ac bus, E0For alternating voltage rated value, Q ' is
It is idle to exchange sub- microgrid output；A, b are corresponding sagging coefficient.
Above-mentioned suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor, step 1) institute
The restriction relation of DC bus-bar voltage and power in micro-capacitance sensor is stated, meets constraints：
Inverter mode Δ P=Δs P1+ΔP2Δ P ＞ 0
Rectification mode Δ P=Δs P3+ΔP4Δ P ＜ 0
In formula, UH1And UL1For two-way DC-AC convertor controls threshold voltage, UmaxAnd UminAllow for DC bus-bar voltage
Maxima and minima, Δ P be the sub- microgrid of direct current to maintain dc bus stabilization needed for rated value export or absorb work(
Rate, then the sub- microgrid power surplus of direct current, two-way DC-AC converters should be to exchange side output power, Δ P by Δ P ＞ 01For converter
With the power that sagging factor alpha is exported, Δ P2It is the power that converter is exported with sagging factor beta；Δ P ＜ 0 represent DC side
Power shortage occurs, DC side answers absorbed power, Δ P3The power absorbed by two-way DC-AC converters with sagging factor alpha, Δ
P4It is the power that two-way DC-AC converters are absorbed with sagging factor beta；α, β are respectively the sagging coefficient of corresponding sagging curve.
Above-mentioned suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor, pass through capacitance
Charge and discharge formula：
In formula, CdcFor DC side storage capacitor, UdcFor DC side busbar voltage；
Show that sagging coefficient meets β ＜ α.
The beneficial effects of the invention are as follows：(1) present invention becomes for a kind of two-way DC-AC suitable for alternating current-direct current mixing micro-capacitance sensor
The multi slope droop control method of parallel operation, to stabilize as the electricity caused by the unbalanced power for exchanging sub- microgrid and the sub- microgrid of direct current
Pressure fluctuation carries out zonal control as control targe, and according to the size of voltage fluctuation, realizes to alternating current-direct current mixing micro-capacitance sensor
Be precisely controlled.
(2) present invention devises control mode of the alternating current-direct current mixing micro-capacitance sensor under isolated island and simultaneously net state, ensure that friendship
The ability of direct current mixing micro-capacitance sensor round-the-clock running.
Description of the drawings
Fig. 1 is one embodiment of the invention alternating current-direct current mixing micro-capacitance sensor rough schematic view；
Fig. 2 is the two-way DC-AC transformer configurations schematic diagram of one embodiment of the invention；
Fig. 3 is one embodiment of the invention multi slope droop control method overall flow schematic diagram；
Fig. 4 is one embodiment of the invention capacitor charge and discharge curve；
Fig. 5 is one embodiment of the invention multi slope sagging curve.
Specific embodiment
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
The control method of a kind of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor of the present embodiment, according to friendship
The power supply situation of direct current both sides determines the operating mode of converter, and by the voltage change caused by unbalanced power into
Row zonal control determines corresponding threshold voltage, more than threshold voltage and the corresponding sagging system of configuration in threshold voltage ranges
Number makes the more accurate of micro-capacitance sensor control by using multi slope droop control system with this, while allows micro-capacitance sensor operation more
Add and stablize, more efficiently.
Since the control method of the present embodiment has differences under the conditions of grid-connected and off-network, describe in two kinds of situation.
A, its rate-determining steps is under grid-connected conditions：
First, the sensor unit in two-way DC-AC converters judges that micro-capacitance sensor is in simultaneously net state.
If the 2, in and net state, since exchange side is connected with public electric wire net, so exchange side electric voltage frequency is by common electrical
Net support need to only consider the stabilization of direct current subnet at this time.According to DC bus-bar voltage in alternating current-direct current mixing micro-capacitance sensor and power
Restriction relation, set threshold voltage UH1And UL1, DC bus-bar voltage rated value Uref, dc bus virtual voltage U, virtual voltage
And the deviation of rated voltage is Δ U=U-Uref, Δ U>0 can determine that direct current subnet power surplus；ΔU<0 it is believed that direct current
Power shortage occurs for net.
3rd, whether it is more than 0 by Δ U in step 2, as basis for estimation, it is whole determines that two-way DC-AC converters work in
Stream mode or inverter mode；
4th, subregion, threshold voltage U are carried out with DC bus-bar voltageH1And UL1, Δ U<Converter works in rectification mould when 0
Formula；ΔU>Converter works in inverter mode when 0.DC bus-bar voltage U, works as U<UL1Or U>UH1When, select sagging factor beta；If
DC bus-bar voltage U belongs to UL1<U<UH1When, the sagging coefficient used is α.
5th, in step 1 and net state, judgement in step 4 is as a result, the sagging coefficient of step 4 selection, as control
The reference signal input control unit of device processed, subsequently into current controller and SPWM controllers, output PWM wave control switching tube
Shutdown is opened, realizes the control to two-way DC-AC converters.
Moreover, meet certain constraints between DC bus-bar voltage deviation and power：
Inverter mode Δ P=Δs P1+ΔP2Δ P ＞ 0
Rectification mode Δ P=Δs P3+ΔP4Δ P ＜ 0
In formula：UH1And UL1For reversible transducer control threshold voltage, UmaxAnd UminThe maximum allowed for DC bus-bar voltage
Value and minimum value, Δ P are that the sub- microgrid of direct current will maintain dc bus stabilization in the power for exporting or absorbing needed for rated value, Δ P
The then sub- microgrid power surplus of direct current of ＞ 0, to ensure that DC bus-bar voltage is stablized, converter should be to exchange side output power, Δ P1
The power exported by converter with sagging factor alpha, Δ P2It is the power that converter is exported with sagging factor beta；0 tables of Δ P ＜
Show that power shortage occurs for DC side, at this point, DC side answers absorbed power, DC bus-bar voltage is maintained to stablize, wherein Δ P3To become
The power that parallel operation is absorbed with sagging factor alpha, Δ P4It is the power that converter is absorbed with sagging factor beta.α, β are respectively corresponding
The sagging coefficient of sagging curve.
Moreover, the setting of the threshold voltage in step 4 is determined according to the power rating of the sub- microgrid of direct current.
Moreover, to make charging and discharging curve of the sagging curve closer to capacitance, suitable sagging factor alpha, β capacitances need to be chosen
Charge and discharge formula be：
In formula, CdcFor DC side storage capacitor, UdcFor DC side busbar voltage.
Moreover, the setting of the threshold voltage in step 4 is determined according to the power rating of the sub- microgrid of direct current.
Also, in traditional fixation droop control, sagging coefficient k determines method as shown in formula.
Pmax- 0=k (Umax-Uref)
ΔP*=k (Udc-Uref)
To make charging and discharging curve of the sagging curve closer to capacitance, improved droop control is using the sagging control being segmented
System, threshold voltage UH1Setting method be function f (Udc) in (Uref, Umax) in the range of U at this time when obtaining maximum valuedc=UH1。
For two-way DC-AC converters in output power and absorbed power, sagging curve is symmetrical, so having
UH1-Uref=Uref-UL1
According to above-mentioned condition, threshold voltage U is calculatedH1And UL1。
U in formuladcFor DC bus-bar voltage, PmaxFor the maximum power that converter can be output, UmaxIt can be held for converter
The maximum voltage received；UrefFor dc bus rated voltage；ΔP*For with the sagging coefficient transformer output power of fixation；Δ P ' is
The power swing of DC capacitor.
Further, it can be obtained by capacitor charge and discharge formula, bigger with the value of power swing, voltage change is got over
Small, i.e., sagging coefficient needs to meet：β ＜ α.
B, its rate-determining steps is under the conditions of off-network：
1., the sensor unit in two-way DC-AC converters judge whether micro-capacitance sensor belongs to and net state.
When two-way DC-AC converters are operated in off-network state, exchange side loses the support of public electric wire net, exchanges sub- microgrid
Stablize two-way DC-AC converters needed to participate in adjusting.
If 2., be in off-network state, it is necessary to ensure the stabilization of the sub- microgrid of alternating current-direct current, whether the sub- microgrid of direct current is stablized,
Whether consistent when judgment basis is with simultaneously net state, exchanging sub- microgrid then needs to consider busbar voltage with frequency in rated value.Exchange
There are the constraintss of P-f, Q-U in sub- microgrid, and as the active-power P that micro- source provides increases, electric voltage frequency f can rise；It is micro-
The reactive power that source provides increases, then voltage UacIt can increase.
If 3., in off-network state, outer consideration exchange side power is also needed to supply shape except judging whether DC side power superfluous
Condition.Whether superfluous the sub- microgrid power of direct current its judgment basis be consistent with the judgment basis of control method under grid-connected conditions, i.e. direct current
Busbar voltage rated value Uref, dc bus virtual voltage U, the deviation of virtual voltage and rated voltage is Δ U=U-Uref, Δ U>
0 can determine that the sub- microgrid power surplus of direct current；ΔU<0 it is believed that power shortage occurs for the sub- microgrid of direct current.
WhenWhen, the output power in each micro- source of reduction；When Converter works in rectification mode；WhenConverter is operated in inversion
Pattern；WhenIt then needs to consider cut-out load.
Active, P is consumed for exchange lateral loadacIt is provided for the sub- microgrid of exchange active；PdcIt is micro- for direct current
The active power that net can be provided.For DC side load consuming power.
Also, under off-network state, the droop characteristic equation for exchanging P-f and Q-U in microgrid is：
In formula f be ac bus electric voltage frequency, fnFor rated frequency, P 'acTo exchange sub- microgrid output power, PnFor exchange
Sub- microgrid exports rated power,UacFor voltage value on ac bus, E0For alternating voltage rated value, Q ' is
It is idle to exchange sub- microgrid output.A, b are corresponding sagging coefficient.
Under the conditions of off-network, the control of alternating current-direct current mixing micro-capacitance sensor is more complicated, the control method of the sub- microgrid of direct current with simultaneously
It is consistent under the conditions of net, but due to the power limited that micro- source each in micro-capacitance sensor can be provided, meanwhile, ensureing the sub- microgrid electricity of direct current
While pressure is stablized, it is also desirable to ensure to exchange the stabilization of sub- microgrid voltage and frequency.When the power that the sub- microgrid of direct current needs is more than
When exchanging the power that sub- microgrid can be provided, that is, exchange sub- microgrid output power P 'ac＞ Pn, can cause to exchange voltage in sub- microgrid
Frequency reduces, and system is prevented the secondary load of cut-out then to be wanted to make satisfaction at this time from stable operation
PAc, jFor the micro- source j output powers of exchange side,Active, P is consumed for exchange lateral load iDc, jIt is micro- for DC side
Source j output powers,Power is consumed for direct current lateral load i.
Embodiment 1
The present embodiment is a kind of control method of the two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor, for
There are problems that unbalanced power in alternating current-direct current mixing micro-capacitance sensor, zonal control is carried out to voltage fluctuation, improves DC bus-bar voltage
Control accuracy.The control method may operate in off-network and grid-connected two states, under simultaneously net state, according to DC bus-bar voltage
Deviation carries out subregion, then uses different sagging slopes to different sections；Under off-network state, consider to exchange sub- microgrid with
The conditions such as energy supply, the load consumption of the sub- microgrid of direct current flexibly select operating mode, while using the sagging control of multi slope
System, improves control accuracy of the two-way DC-AC converters to DC bus-bar voltage.Using multi slope droop control, as shown in figure 3,
Additional communication line is not required to, it can be achieved that the hot plug that each micro- source respectively loads, and with certain adaptive adjustment capability.
The implementation case is with the alternating current-direct current micro-capacitance sensor comprising photovoltaic generation unit, distributed energy storage unit and diesel-driven generator
In two-way DC-AC converters control for.As shown in Figure 1.
As shown in Fig. 2, the sensor unit in two-way DC-AC converters judges whether micro-capacitance sensor belongs to and netted
State.
If (i), only consider to maintain the stabilization of DC side, specifically control process as follows in simultaneously net state:
Step I：The influence run to micro-capacitance sensor according to busbar voltage deviation, with reference to the charge-discharge characteristic curve that capacitance fills,
Subregion is carried out to DC bus-bar voltage.If DC bus-bar voltage rated value is Uref, DC bus-bar voltage U, Δ U>It is two-way when 0
DC-AC converters should work in inverter mode, work as U<UH1When its sagging coefficient be α；Work as UH1<During U, sagging coefficient is β.When
ΔU<When 0, two-way DC-AC converters should work in rectification mode, if UL1<Its sagging coefficient of U is α；Work as U<UL1When, it is sagging
Coefficient is β.
Also, to make charging and discharging curve of the sagging curve closer to capacitance, as shown in figure 4, suitable sagging system need to be chosen
Number α, the charge and discharge formula of β capacitances are：
In formula, CdcFor DC side storage capacitor, UdcFor DC side busbar voltage.It can be obtained by capacitor charge and discharge formula,
Bigger with the value of power swing, voltage change is smaller, i.e., sagging coefficient needs to meet：β ＜ α.
Also, the setting of threshold voltage UH1 and UL1 are determined according to the power rating of the sub- microgrid of direct current.
In traditional fixation droop control, sagging coefficient k determines method as shown in formula.
Pmax- 0=k (Umax-Uref)
ΔP*=k (Udc-Uref)
To make charging and discharging curve of the sagging curve closer to capacitance, improved droop control is using the sagging control being segmented
System, threshold voltage UH1Setting method be function f (Udc) in (Uref, Umax) in the range of U at this time when obtaining maximum valuedc=UH1。
For converter in output power and absorbed power, sagging curve is symmetrical, so having
UH1-Uref=Uref-UL1
According to above-mentioned condition, threshold voltage U is calculatedH1And UL1。
U in formuladcFor DC bus-bar voltage, PmaxFor the maximum power that two-way DC-AC converters can be output, UmaxIt is two-way
The maximum voltage that DC-AC converters can bear；UrefFor dc bus rated voltage；ΔP*It is two-way with the sagging coefficient of fixation
DC-AC converter output powers；Δ P ' is the power swing of DC capacitor.
It is consumption power for the sub- microgrid of direct current when two-way DC-AC reversible transducers work in inverter mode
Load.
When DC bus-bar voltage U belongs to (Uref, UH1) section when, the relational expression between DC bus-bar voltage and output power
For：
U*=U- α Δs P1 (1)
U is d-c bus voltage value, U*It is two-way DC-AC converters from DC side transimission power Δ P1It is straight after to exchange side
Bus voltage value is flowed, at this time U*=Uref。
As DC bus-bar voltage U>UH1When, the relational expression between DC bus-bar voltage and output power is：
U*=U- β Δs P2 (2)
U is d-c bus voltage value, U*It is two-way DC-AC converters from DC side transimission power Δ P2It is straight after to exchange side
Flow bus voltage value, UmaxThe maximum DC bus-bar voltage that can bear for two-way DC-AC converters.At this point, U*=UH1, with
(1) the middle slope of formula is the droop control of α, exports corresponding power, and it is U to make DC bus-bar voltageref。
When two-way DC-AC converters work in rectification mode, it is to provide the micro- of power for the sub- microgrid of direct current
Source.
When DC bus-bar voltage U belongs to (UL1, Uref) section when, the relational expression between DC bus-bar voltage and absorbed power
For：
U*=U- α Δs P3 (3)
U is d-c bus voltage value, U*It is two-way DC-AC converters from exchange side absorbed power Δ P3Dc bus electricity afterwards
Pressure value；U at this time*=Uref。
As DC bus-bar voltage U<UL1When, the relational expression between DC bus-bar voltage and output power is：
U*=U- β Δs P4 (4)
U is d-c bus voltage value, U*It is two-way DC-AC converters from exchange side absorbed power Δ P4Dc bus electricity afterwards
Pressure value；Work as U*=UL1When, using (3) formula, slope is the droop control of α, absorbs corresponding power, and it is U to make DC bus-bar voltageref。
Step II：After determining value described in micro-capacitance sensor step I, further according to step I divide working region to each region
Control be designed, illustrate respectively for two-way DC-AC converters rectification mode and inverter mode.
A. rectification mode
In alternating current-direct current mixing microgrid, the stable operation of micro-capacitance sensor is maintained, when core work ensures the power of micro-capacitance sensor
Balance, i.e., the power that micro- source provides are in dynamic equilibrium with the power that each load is consumed：
In formula, PgridTo exchange the Power Exchange between sub- microgrid and public electric wire net；It is consumed by exchange lateral load i
Active, PacdcFor reversible transducer transimission power, PacdcIt is represented more than zero by the lateral exchange side output power of direct current；PacdcFor
Negative value, then it represents that the sub- microgrid of direct current is from exchange side absorbed power.Pdc,jFor the micro- source j output powers of DC side,For DC side
Load i consumption power.
The value Δ U corresponding working regions of microgrid power shortage Δ P selections sub- with direct current are fallen by DC bus-bar voltage.
Δ U=Uref-U
ΔU≤Uref-UL1When, control formula is：
U*=U- α Δs P3
Δ P=Δs P3=Pacdc
Δ P is DC side output power in formula, when in rectification mode, the sub- microgrid of direct current from exchange side absorbed power,
Therefore Δ P is negative value.
Δ U ＞ Uref-UL1When, Discrete control need to be used, control formula is：
Δ P=Δs P3+ΔP4
ΔP3＜ 0
ΔP4＜ 0
Δ P=Pacdc
When power shortage is larger, and Voltage Drop exceeds threshold value, using Discrete control.First using slope as the controlling curve of β,
Absorbed power Δ P3, DC bus-bar voltage is made to rise to UL1, then switch to the controlling curve that slope is α, absorbed power Δ P4,
Until making U*=Uref.Wherein Δ P3The power absorbed by two-way DC-AC converters with sagging factor alpha from exchange side, Δ P4It is
The power that two-way DC-AC converters are absorbed with sagging factor beta from exchange side.
B. inverter mode
The condition that two-way DC-AC converters work in inverter mode is：
Power-balance relationship is in micro-capacitance sensor at this time
In formula, PgridTo exchange the Power Exchange between sub- microgrid and public electric wire net；It is consumed by exchange lateral load i
Active, PacdcFor reversible transducer transimission power, power transmission direction is to be transferred to exchange side, P from DC sideacdcFor positive value,
Pdc,jFor the micro- source j output powers of DC side,Power is consumed for direct current lateral load i.
Further, it is corresponding by the lift-off value Δ U of DC bus-bar voltage microgrid power surplus volume Δ P selections sub- with direct current
Working region.
Δ U=U-Uref
ΔU≤UH1-UrefWhen, control formula is：
U*=U- α Δs P1
ΔP1=Δ P=Pdcac
Δ P is DC side output power in formula, and converter is operated in inverter mode, and power transfer direction is micro- from direct current
Net is transferred to the sub- microgrid of exchange, Δ P1The power exported by converter with sagging factor alpha, Δ P are positive value.
Δ U ＞ UH1-UrefWhen, Discrete control need to be used, control formula is：
Δ P=Δs P1+ΔP2
ΔP1＞ 0
ΔP2＞ 0
Δ P=Pdcac
When power excess is larger, when voltage increases above threshold value, using Discrete control.First using slope as the controlling curve of β,
Output power Δ P1, DC bus-bar voltage is made to drop to UH1, then switch to the controlling curve that slope is α, output power Δ P2,
Until making U*=Uref
Step III：The signals such as the voltage, the electric current that are sampled by preceding step, according to power-balance state in micro-capacitance sensor,
Which kind of subregion is real-time judge busbar voltage be in, and using voltage, double current loop modulation device, eventually passes through pwm modulator output
Drive signal changes switching tube state, realizes the subregion curve dynamic droop control of system.
(ii), off-network state control process is as follows：
When micro-capacitance sensor is in off-network state, exchange side loses the support of bulk power grid, needs the steady of alternating current-direct current both sides at this time
Fixed, direct current microgrid is consistent when whether stablizing judgment basis with simultaneously net state, and exchanging sub- microgrid then needs to consider busbar voltage and frequency
Whether rate is in rated value.It exchanges there are the constraints of P-f, Q-U in sub- microgrid, as the active-power P that micro- source provides increases
Greatly, electric voltage frequency f can rise；The reactive power that micro- source provides increases, then voltage UacIt can increase.
Step i：In off-network state, also need to consider exchange side power supply shape in addition to judging whether DC side power is superfluous
Condition.WhenWhen, the output power in each micro- source of reduction；When
Two-way DC-AC converters work in rectification mode；WhenTwo-way DC-AC converters work
In inverter mode；WhenIt then needs to consider cut-out load.
Active, P is consumed for exchange lateral loadacFor exchange sub- microgrid provided it is active,；PdcFor direct current
The active power that microgrid can be provided.For DC side load consuming power.
Step ii：Subregion, threshold voltage U are carried out with DC bus-bar voltageH1And UL1, Uref<Two-way DC-AC transformation when 0
Device works in rectification mode；Uref>Two-way DC-AC converters work in inverter mode when 0.DC bus-bar voltage U, works as U<UL1Or U
>UH1When, select sagging factor alpha；If DC bus-bar voltage U belongs to UL1<U<UH1When, the sagging coefficient used is β.
Moreover, meet certain constraints between DC bus-bar voltage deviation and power：
Inverter mode Δ P=Δs P1+ΔP2Δ P ＞ 0
Rectification mode Δ P=Δs P3+ΔP4Δ P ＜ 0
In formula：UH1And UL1For two-way DC-AC convertor controls threshold voltage, UmaxAnd UminAllow for DC bus-bar voltage
Maxima and minima, Δ P is the sub- microgrid power swing value of direct current, the then sub- microgrid power surplus of direct current of Δ P ＞ 0, Δ P ＜ 0
Represent that power shortage occurs for DC side.α, β are respectively the sagging coefficient of corresponding sagging curve.
When two-way DC-AC converters are operated in off-network state, exchange side loses the support of public electric wire net, exchanges sub- microgrid
Stablize two-way DC-AC converters needed to participate in adjusting.
Moreover, under off-network state, the control mode in relation to the sub- microgrid of direct current is identical with grid-connected conditions, only need to additionally meet
PAc, jFor the micro- source j output powers of exchange side,Active, P is consumed for exchange lateral load iDc, jIt is micro- for DC side
Source j output powers,Power is consumed for direct current lateral load i.
Moreover, under off-network state, the droop characteristic equation for exchanging P-f and Q-U in microgrid is：
In formula f be ac bus electric voltage frequency, fnFor rated frequency, P 'acTo exchange sub- microgrid output power, PnFor exchange
Sub- microgrid exports rated power,PacIt is provided for the sub- microgrid of exchange active；UacFor voltage on ac bus
Value, E0For alternating voltage rated value, Q ' is idle to exchange sub- microgrid output.A, b are corresponding sagging coefficient.
Under the conditions of off-network, the control of alternating current-direct current mixing micro-capacitance sensor is more complicated, the control method of the sub- microgrid of direct current with simultaneously
It is consistent under the conditions of net, but due to the power limited that micro- source each in micro-capacitance sensor can be provided, meanwhile, ensureing the sub- microgrid electricity of direct current
While pressure is stablized, it is also desirable to ensure to exchange the stabilization of sub- microgrid voltage and frequency.When the power that the sub- microgrid of direct current needs is more than
When exchanging the power that sub- microgrid can be provided, that is, exchange sub- microgrid output power P 'ac＞ Pn, can cause to exchange voltage in sub- microgrid
Frequency reduces, and system is prevented the secondary load of cut-out then to be wanted to make satisfaction at this time from stable operation
PAc, jFor the micro- source j output powers of exchange side,Active, P is consumed for exchange lateral load iDc, jIt is micro- for DC side
Source j output powers,Power is consumed for direct current lateral load i.
Step iii：The signals such as the voltage, the electric current that are sampled by preceding step, it is real according to power-balance state in system
When judge which kind of subregion is busbar voltage be in, using voltage, double current loop modulation device, eventually pass through pwm modulator output and drive
Dynamic signal, changes switching tube state, realizes the subregion curve dynamic droop control of system.
Multi slope sagging curve is as shown in Figure 5.
Output power is sent into control module by the control method of the present embodiment, all micro- sources, coordinates ac bus and direct current
The voltage that sampling unit on busbar is acquired, current signal, by control algolithm, output pwm signal control converter is opened
Pipe work is closed, so as to fulfill the control to DC-AC converters, reaches the control effect to alternating current-direct current stream mixing micro-capacitance sensor.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although describing the specific embodiment of the present invention above in association with attached drawing, those of ordinary skill in the art should
Understand, these are merely examples, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (6)
1. a kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor, it is characterized in that, it is straight for handing over
There are problems that unbalanced power in stream mixing micro-capacitance sensor, zonal control is carried out to voltage fluctuation；It is divided into off-network and grid-connected two kinds of shapes
State, and under net state carries out subregion according to DC bus-bar voltage deviation, then to different sections using it is different it is sagging tiltedly
Rate；Under off-network state, consider to exchange the energy supply of sub- microgrid and the sub- microgrid of direct current, load consumption selection operating mode, together
The droop control of Shi Caiyong multi slopes；To realize the subregion curve dynamic droop control of alternating current-direct current mixing micro-capacitance sensor.
It is 2. special as described in claim 1 suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor
Sign is that the control method includes the following steps：
Step 1 judges that micro-capacitance sensor is in simultaneously net state or off-network state according to the sensor unit of two-way DC-AC converters；
Step 2 judges stable state under micro-grid connection state by the sub- microgrid stable condition of direct current；Pass through the sub- microgrid of direct current
Judge stable state under micro-capacitance sensor off-network state with sub- microgrid stable condition is exchanged；
Step 3, respectively determine and net state under and off-network state under two-way DC-AC converters operating mode, select it is corresponding
Sagging coefficient；
Step 4, the operating mode that grid-connected or off-network state obtained by step 1, step 3 are determined and selected sagging coefficient conduct
The reference signal input control unit of controller, into current controller and SPWM controllers, output PWM wave controls switching tube
Break-make by controlling two-way DC-AC converters, realizes the control to alternating current-direct current mixing micro-capacitance sensor.
It is 3. special as claimed in claim 2 suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor
Sign is, and the judgement of the sub- microgrid stable condition of net state direct current, operating mode determine and the selection of sagging coefficient includes：
1), the Rule of judgment that the sub- microgrid of direct current is stablized, according to the restriction relation of DC bus-bar voltage in micro-capacitance sensor and power, setting
Threshold voltage UH1And UL1, DC bus-bar voltage rated value Uref, dc bus virtual voltage U, virtual voltage and rated voltage
Deviation is Δ U=U-UrefIf Δ U>0, the sub- microgrid power surplus of direct current；If Δ U<0, then the sub- microgrid of direct current power shortage occurs；
2) it, divides operating mode and selects sagging coefficient, subregion, Δ U are carried out according to DC bus-bar voltage<When 0, two-way DC-AC becomes
Parallel operation works in rectification mode；ΔU>When 0, two-way DC-AC converters work in inverter mode；Work as U<UL1Or U>UH1When, it selectes
Sagging factor beta；Work as UL1<U<UH1When, the sagging coefficient used is α.
It is 4. special as claimed in claim 3 suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor
Sign is, the sub- microgrid of off-network state direct current with exchange the judgement of sub- microgrid stable condition, operating mode determine and sagging coefficient
Selection includes：
(1), the same step 1) of judgement of the sub- microgrid stable condition of direct current；The judgement of sub- microgrid stable condition is exchanged then according to exchange
Constraints P-f, Q-U present in microgrid, as the active-power P that micro- source provides increases, electric voltage frequency f can rise；Micro- source
The reactive power of offer increases, then voltage UacIt can increase；
(2), operating mode is determined, whenWhen, the output power in each micro- source of reduction；WhenTwo-way DC-AC converters work in rectification mode；When
Two-way DC-AC converters are operated in inverter mode；When It then needs to consider that cut-out is born
It carries；Active, P is consumed for exchange lateral loadacIt is provided for the sub- microgrid of exchange active；PdcFor the sub- microgrid institute of direct current
The active power that can be provided；For DC side load consuming power；
(3), sagging coefficient is selected, the droop characteristic equation for exchanging the constraints P-f and Q-U of sub- microgrid is：
In formula f be ac bus electric voltage frequency, fnFor rated frequency, P 'acTo exchange sub- microgrid output power, PnIt is micro- for exchange
Net output rated power,UacFor voltage value on ac bus, E0For alternating voltage rated value, Q ' is exchange
Sub- microgrid output is idle；A, b are corresponding sagging coefficient.
It is 5. special as claimed in claim 3 suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor
Sign is that the restriction relation of DC bus-bar voltage and power in the step 1) micro-capacitance sensor meets constraints：
Inverter mode Δ P=Δs P1+ΔP2Δ P ＞ 0
Rectification mode Δ P=Δs P3+ΔP4Δ P ＜ 0
In formula, UH1And UL1For two-way DC-AC convertor controls threshold voltage, UmaxAnd UminThe maximum allowed for DC bus-bar voltage
Value and minimum value, Δ P are that the sub- microgrid of direct current will maintain dc bus stabilization in the power for exporting or absorbing needed for rated value, Δ P
Then the sub- microgrid power surplus of direct current, two-way DC-AC converters should be to exchange side output power, Δ P by ＞ 01It is converter with sagging
The power that factor alpha is exported, Δ P2It is the power that converter is exported with sagging factor beta；Δ P ＜ 0 represent that work(occurs for DC side
Rate vacancy, DC side answer absorbed power, Δ P3The power absorbed by two-way DC-AC converters with sagging factor alpha, Δ P4It is double
The power absorbed to DC-AC converters with sagging factor beta；α, β are respectively the sagging coefficient of corresponding sagging curve.
It is 6. special as claimed in claim 3 suitable for the control method of the two-way DC-AC converters of alternating current-direct current mixing micro-capacitance sensor
Sign is to pass through the charge and discharge formula of capacitance：
In formula, CdcFor DC side storage capacitor, UdcFor DC side busbar voltage；
Show that sagging coefficient meets β ＜ α.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810098533.6A CN108199380A (en) | 2018-01-31 | 2018-01-31 | A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810098533.6A CN108199380A (en) | 2018-01-31 | 2018-01-31 | A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108199380A true CN108199380A (en) | 2018-06-22 |
Family
ID=62592155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810098533.6A Withdrawn CN108199380A (en) | 2018-01-31 | 2018-01-31 | A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108199380A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879765A (en) * | 2018-07-02 | 2018-11-23 | 太原理工大学 | Prevent the bidirectional power converter control method of micro-capacitance alternating current bus current distortion |
| CN109066824A (en) * | 2018-09-17 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of active distribution network load compliant balance control method |
| CN109510236A (en) * | 2018-11-15 | 2019-03-22 | 南京德睿能源研究院有限公司 | A kind of intelligent micro-grid controller and control method integrating control monitoring for protection |
| CN110556816A (en) * | 2019-08-31 | 2019-12-10 | 东莞理工学院 | Composite droop control method and system suitable for direct-current micro-grid |
| CN110676890A (en) * | 2019-10-18 | 2020-01-10 | 燕山大学 | Modal switching control method for networking operation of alternating current-direct current hybrid micro-grid containing power electronic transformer |
| CN111162556A (en) * | 2020-01-09 | 2020-05-15 | 中国科学院电工研究所 | Distributed autonomous control decision method for AC/DC power distribution and utilization system |
| CN111740426A (en) * | 2020-06-30 | 2020-10-02 | 上海电力大学 | Island alternating current-direct current hybrid micro-grid group power cooperative control method |
| CN112736921A (en) * | 2020-12-30 | 2021-04-30 | 丽水市普明电力建设工程有限公司 | Three-slope droop control method with voltage out-of-limit early warning function |
| CN112769118A (en) * | 2020-12-30 | 2021-05-07 | 丽水市普明电力建设工程有限公司 | Control method for preventing low voltage of direct current power grid |
| CN113422395A (en) * | 2021-06-18 | 2021-09-21 | 杭州电子科技大学信息工程学院 | Active power balancing method for alternating current-direct current hybrid micro-grid |
| WO2022165914A1 (en) * | 2021-02-05 | 2022-08-11 | 山东大学 | Cooperative control method for distributed voltage source converter, and alternating-current/direct-current hybrid microgrid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078325A (en) * | 2012-12-31 | 2013-05-01 | 河北省电力公司电力科学研究院 | Alternating current and direct current mixed micro power grid system and control method thereof |
| CN104917170A (en) * | 2015-05-04 | 2015-09-16 | 福州大学 | Method for adjusting voltage and frequency through micro power grid self-adaption droop control based on PI control |
| CN105071393A (en) * | 2015-09-08 | 2015-11-18 | 许继集团有限公司 | Alternating current/direct-current hybrid microgrid direct-current busbar voltage control method |
| CN106961101A (en) * | 2017-05-17 | 2017-07-18 | 安徽工业大学 | One kind has multistage generatrix voltage compensation direct-current micro-grid modified multi slope droop control system and method |
| CN107104427A (en) * | 2017-05-17 | 2017-08-29 | 安徽工业大学 | A kind of adaptive multi slope droop control system and method for direct-current grid |
-
2018
- 2018-01-31 CN CN201810098533.6A patent/CN108199380A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078325A (en) * | 2012-12-31 | 2013-05-01 | 河北省电力公司电力科学研究院 | Alternating current and direct current mixed micro power grid system and control method thereof |
| CN104917170A (en) * | 2015-05-04 | 2015-09-16 | 福州大学 | Method for adjusting voltage and frequency through micro power grid self-adaption droop control based on PI control |
| CN105071393A (en) * | 2015-09-08 | 2015-11-18 | 许继集团有限公司 | Alternating current/direct-current hybrid microgrid direct-current busbar voltage control method |
| CN106961101A (en) * | 2017-05-17 | 2017-07-18 | 安徽工业大学 | One kind has multistage generatrix voltage compensation direct-current micro-grid modified multi slope droop control system and method |
| CN107104427A (en) * | 2017-05-17 | 2017-08-29 | 安徽工业大学 | A kind of adaptive multi slope droop control system and method for direct-current grid |
Non-Patent Citations (2)
| Title |
|---|
| XIAOLIANG YANG等: ""Hierarchical Control Strategy of Grid-connected DC Microgrids"", 《2016 IEEE 8TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE》 * |
| 刘佳易: ""交直流混合微电网中双向AC/DC功率变换器控制策略研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879765A (en) * | 2018-07-02 | 2018-11-23 | 太原理工大学 | Prevent the bidirectional power converter control method of micro-capacitance alternating current bus current distortion |
| CN108879765B (en) * | 2018-07-02 | 2021-04-02 | 太原理工大学 | Bidirectional power converter control method for preventing micro-grid alternating current bus current distortion |
| CN109066824A (en) * | 2018-09-17 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of active distribution network load compliant balance control method |
| CN109066824B (en) * | 2018-09-17 | 2021-12-10 | 南京南瑞继保电气有限公司 | Flexible balance control method for active power distribution network load |
| CN109510236A (en) * | 2018-11-15 | 2019-03-22 | 南京德睿能源研究院有限公司 | A kind of intelligent micro-grid controller and control method integrating control monitoring for protection |
| CN110556816B (en) * | 2019-08-31 | 2021-01-26 | 东莞理工学院 | Composite droop control method and system suitable for direct-current micro-grid |
| CN110556816A (en) * | 2019-08-31 | 2019-12-10 | 东莞理工学院 | Composite droop control method and system suitable for direct-current micro-grid |
| CN110676890A (en) * | 2019-10-18 | 2020-01-10 | 燕山大学 | Modal switching control method for networking operation of alternating current-direct current hybrid micro-grid containing power electronic transformer |
| CN110676890B (en) * | 2019-10-18 | 2023-04-18 | 燕山大学 | Mode switching control method during networking operation of alternating current-direct current hybrid micro-grid |
| CN111162556B (en) * | 2020-01-09 | 2021-09-03 | 中国科学院电工研究所 | Distributed autonomous control decision method for AC/DC power distribution and utilization system |
| CN111162556A (en) * | 2020-01-09 | 2020-05-15 | 中国科学院电工研究所 | Distributed autonomous control decision method for AC/DC power distribution and utilization system |
| CN111740426A (en) * | 2020-06-30 | 2020-10-02 | 上海电力大学 | Island alternating current-direct current hybrid micro-grid group power cooperative control method |
| CN111740426B (en) * | 2020-06-30 | 2023-09-26 | 上海电力大学 | Island AC/DC hybrid micro-grid group power cooperative control method |
| CN112736921A (en) * | 2020-12-30 | 2021-04-30 | 丽水市普明电力建设工程有限公司 | Three-slope droop control method with voltage out-of-limit early warning function |
| CN112769118A (en) * | 2020-12-30 | 2021-05-07 | 丽水市普明电力建设工程有限公司 | Control method for preventing low voltage of direct current power grid |
| CN112736921B (en) * | 2020-12-30 | 2023-11-17 | 丽水市普明电力建设工程有限公司 | Three-slope sagging control method with voltage threshold crossing early warning |
| WO2022165914A1 (en) * | 2021-02-05 | 2022-08-11 | 山东大学 | Cooperative control method for distributed voltage source converter, and alternating-current/direct-current hybrid microgrid |
| CN113422395A (en) * | 2021-06-18 | 2021-09-21 | 杭州电子科技大学信息工程学院 | Active power balancing method for alternating current-direct current hybrid micro-grid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108199380A (en) | A kind of control method of two-way DC-AC converters suitable for alternating current-direct current mixing micro-capacitance sensor | |
| CN107181275B (en) | A kind of photovoltaic DC microgrid control method of the system containing distributed energy storage | |
| CN104184159B (en) | The cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system | |
| CN110556856B (en) | Communication-independent multi-mode electric energy router and seamless switching control method thereof | |
| EP3057192A1 (en) | An energy internet and a hierarchical control system and a control method thereof | |
| CN106786694B (en) | A kind of bipolarity direct-current grid mixed energy storage system control method for coordinating | |
| CN110299717A (en) | A kind of distributed mixed energy storage system balancing energy control strategy based on Model Predictive Control | |
| CN110137992B (en) | Island direct current micro-grid coordinated stable operation control method | |
| CN107579698A (en) | A kind of photovoltaic plant energy storage method | |
| CN209516643U (en) | It can source router | |
| CN106786729A (en) | A kind of microgrid unsteady flow energy storage device and its energy management method | |
| CN108258728A (en) | A kind of control method of the adjustable degree type wind-solar-diesel storage independent micro-grid based on droop control | |
| CN109193613A (en) | A kind of DC micro power grid system and its control method | |
| CN109888845B (en) | AC/DC hybrid micro-grid | |
| CN110912242A (en) | Large-disturbance transient stability coordination control method for DC micro-grid containing hybrid energy storage | |
| CN107910869A (en) | A kind of distribution static series compensator control system and its control method | |
| CN111900710A (en) | Grid-connected direct-current micro-grid coordination control method | |
| CN105226687A (en) | A kind of energy-storage system topological structure being applicable to large-scale photovoltaic generating | |
| CN111525546A (en) | DC micro-grid energy storage unit hierarchical operation control method based on charge state | |
| CN105322532B (en) | Direct-current grid energy storage optimization and control method for coordinating | |
| CN109888786A (en) | A kind of control method of alternating current-direct current mixing micro-capacitance sensor | |
| CN113394804A (en) | SOC (system on chip) balance and power uniform control method of direct-current micro-grid energy storage system | |
| CN109245160A (en) | A kind of light storage grid-connected control method and device for stabilizing photovoltaic power fluctuation | |
| CN105406488A (en) | Overvoltage inhibition method based on reactive power regulation of photovoltaic inverter | |
| CN106655257A (en) | New energy hybrid power supply-based energy management system and method of port shore power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180622 |
|
| WW01 | Invention patent application withdrawn after publication |