CN107240934A - Alternating current-direct current mixing microgrid multi-mode operation control method for coordinating and smooth-switching method - Google Patents
Alternating current-direct current mixing microgrid multi-mode operation control method for coordinating and smooth-switching method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
A kind of alternating current-direct current mixing microgrid multi-mode operation control method for coordinating and smooth-switching method, are divided into exchanging area by alternating current-direct current mixing microgrid, hand over straight trend section area and DC area；Degree when alternating current-direct current mixes micro-grid connection operation according to DC area unbalanced power amount is divided into autonomous operation pattern and the straight operational modes of Jiao Ding；In alternating current-direct current mixing microgrid off-grid operation, select two-way AC/DC transverters based on one in many two-way AC/DC transverters, remaining is, from two-way AC/DC transverters, operational mode to be divided into straight friendship small-power operational mode surely according to the number of units difference that two-way AC/DC transverters are accessed and directly high-power operational mode is handed over surely.Secondary Control is carried out respectively by DC bus-bar voltage and ac bus frequency to alternating current-direct current mixing microgrid and trend is calmed down, alternating current-direct current mixing microgrid is realized from handing over fixed straight operational mode to directly handing over small-power operational mode to take over seamlessly surely, the high-power operational modes of Zhi Dingjiao is switched to autonomous operation mode smooth.The present invention improves the quality of power supply of system.
Description
Technical field
The present invention relates to a kind of alternating current-direct current mixing microgrid power coordination control method.More particularly to a kind of alternating current-direct current mixing
Microgrid multi-mode operation control method for coordinating and smooth-switching method.
Background technology
With the increase and the growth of quantity of distributed electrical source category, the popularization of DC load, the complexity of distribution net work structure
Various, exchange microgrid is difficult to meet growing confession need for electricity comprehensively, to ensure the efficient of new energy and regenerative resource
Dissolve and utilize and meet user's diversification electricity needs, the research of alternating current-direct current mixing microgrid need to be actively developed.Alternating current-direct current mixing microgrid
Exchange microgrid and direct-current micro-grid each advantage can be effectively integrated, the complementary energy supplying system of alternating current-direct current is constituted.
The high density distributed energy accessed in alternating current-direct current mixing microgrid has strong randomness, and bulk power grid and exchanging area,
Exchanging area and DC area, DC area and the interregional energy in bidirectional flow of energy-storage system, certainly will cause microgrid power flow changing various, right
The stable operation of alternating current-direct current mixing microgrid proposes requirements at the higher level.Further research is incorporated into the power networks and off-grid operation mode handover procedure
In, hand over straight trend section to there are problems that power is unable to abrupt release, transient voltage and rush of current, therefore research are caused to system
Suitable alternating current-direct current mixing microgrid multi-mode stable operation and grid-connected, off-network are taken over seamlessly with significant.
Existing literature is studied and imperfection in this respect, and document Zhang Lu, Tang Wei are published on November 20th, 2016《Chinese electricity
Machine engineering journal》On the 22nd phase of volume 36《Alternating current-direct current mixing medium voltage distribution network power based on VSC-voltage coordinates control》One
Wen Zhongcong optimizes operation aspect and distribution network operation is divided into normal and risk two states, real using mathematical modeling and optimized algorithm
The economic security operation of existing power network, not from the fluctuation of system level analysis voltage and power-balance problem.Document Li Peng, Yu Xiao
Cover, Zhao Bo is published on January 5th, 2016《Proceedings of the CSEE》On the 1st phase of volume 36《Friendship based on Mixed Sensitivity
Direct current mixing microgrid alternating current-direct current section voltage H∞Robust control》Voltage in one text for section both sides proposes sensitive based on mixing
The H of degree∞Robust control, improves alternating current-direct current mixing micro-capacitance sensor and resists the performance that exchange disturbance and direct current are disturbed, research stresses to hand over
The two-way AC/DC converter Controls method of direct current section, does not consider to hand over straight trend section power two-way flow.Document Wang Pan
Precious, Wang Wei is published in September in 2015 5《Proceedings of the CSEE》On the 17th phase of volume 35《Direct-current grid off-network with
Be incorporated into the power networks Unified Control Strategy》The coordination autonomous control scheme based on DC bus-bar voltage information is designed in one text, by non-
Important load downrating stable DC voltage, and can be switched according to predetermined control scheme between each pattern, realize direct current
Microgrid simultaneously, off-grid operation be uniformly controlled, but only illustrate the logic implementation of multi-mode switching in text, do not consider simultaneously,
Seamlessly transitting in off-network mode handover procedure.
Therefore, how one kind is provided and disclosure satisfy that alternating current-direct current mixing microgrid multi-mode stable operation and grid-connected smooth with off-network
The problem of control method of switching is those skilled in the art's current urgent need to resolve.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of alternating current-direct current mixing microgrid and adjusted according to practical operation situation
The multi-mode operation control method for coordinating and smooth-switching method of flow of power.
The technical solution adopted in the present invention is：A kind of alternating current-direct current mixing microgrid multi-mode operation control method for coordinating, be
Multi-mode operation applied to many two-way AC/DC transverters and the two-way DC/DC transverters of energy storage is coordinated control and taken over seamlessly
Method, described method includes：Alternating current-direct current mixing microgrid is divided into exchanging area, hands over straight trend section area and DC area；It is straight handing over
Degree during stream mixing micro-grid connection operation according to DC area unbalanced power amount is divided into autonomous operation pattern and Jiao Ding is directly run
Pattern；In alternating current-direct current mixing microgrid off-grid operation, two-way AC/DC based on one in many two-way AC/DC transverters is selected
Transverter, remaining is that, from two-way AC/DC transverters, the number of units accessed according to two-way AC/DC transverters is different by operational mode
It is divided into straight friendship small-power operational mode surely and directly hands over high-power operational mode surely.
In autonomous operation pattern, the DC area unbalanced power amount of alternating current-direct current mixing microgrid is less than the charge and discharge electric work of energy storage
Rate limit valueThe two-way DC/DC transverters of energy storage maintain direct current female using the control mode for determining DC bus-bar voltage-limit power
Line voltage is constant, and many two-way AC/DC transverters are in holding state；When handing over fixed straight operational mode, alternating current-direct current mixing microgrid
DC area unbalanced power amount is more than or equal to the charge-discharge electric power limit value of energy storageEnergy storage is with charge-discharge electric power limit value
Output-constant operation, many two-way AC/DC transverters are straight come constant alternating current-direct current mixing microgrid using DC voltage deviation droop control
Flow busbar voltage.
Described autonomous operation pattern and the straight operational modes of Jiao Ding are according to the charge-discharge electric power limit value of settingAnd direct current
Busbar voltage deviation thresholdFree switching operational mode；Specifically, charge-discharge electric power limit value is reached in energy storageWhen,
There is DC bus-bar voltage deviation, when reaching default voltage deviation threshold valueAfterwards, start many two-way AC/DC transverters
Operation, carrys out stable DC busbar voltage；When DC area, unbalanced power amount is decreased to charge-discharge electric power limit valueIt is interior, and directly
Stream busbar voltage deviation is decreased to voltage deviation threshold valueInterior, then energy storage is automatically reverted to from output-constant operation determines dc bus
Voltage-limit Power Control operation, many two-way AC/DC transverters are exited, in holding state.
When directly handing over small-power operational mode surely, exchanging area unbalanced power amount is less than main two-way AC/DC transverters capacityTwo-way AC/DC transverters are only led using ac bus frequency-voltage control is determined, remaining is at two-way AC/DC transverters
In holding state；When directly handing over high-power operational mode surely, exchanging area unbalanced power amount exceedes main two-way AC/DC transverters and held
AmountMain two-way AC/DC transverters output-constant operation, many use frequency departure droop control from two-way AC/DC transverters.
It is described it is straight hand over small-power operational mode surely and directly hand over high-power operational mode surely, according to leading the two-way AC/DC changes of current
Device capacityWith ac bus frequency departure threshold valueFree switching operational mode, be specifically：In the main two-way AC/DC changes of current
Device transimission power exceedes capacityWhen, there is deviation in ac bus frequency, and described deviation reaches frequency departure threshold value
Afterwards, many from two-way AC/DC transverters startup optimization, comes symmetrical alternating current area power and maintenance voltage and frequency-invariant；Work as operating mode
Change causes exchanging area frequency departure to be less than deviation thresholdWhen, many are exited in standby shape from two-way AC/DC transverters
State, main two-way AC/DC transverters are automatically reverted to from output-constant operation determines ac bus frequency-voltage control operation.
A kind of smooth-switching method based on alternating current-direct current mixing microgrid multi-mode operation control method for coordinating, is by handing over
The DC bus-bar voltage and ac bus frequency of direct current mixing microgrid carry out Secondary Control successively respectively and trend is calmed down, and makes friendship straight
Stream mixing microgrid is realized from handing over fixed straight operational mode to directly handing over small-power operational mode to take over seamlessly surely, makes the high-power fortune of Zhi Dingjiao
Row mode switches to autonomous operation mode smooth.
Described Secondary Control is that alternating current-direct current mixing microgrid detects off-network signal when handing over fixed straight operational mode operation
Afterwards, secondary pressure regulation is carried out to DC bus-bar voltage in the inspection same period by the controller of many two-way AC/DC transverters, adjusted to electricity
Standard value is pressed, and charge-discharge electric power limit value is cancelled in energy storageAfter Secondary Control is completed, energy storage increase charge-discharge electric power is protected
DC area power-balance is held, makes the power reduction transmitted on many two-way AC/DC transverters to zero, returns to holding state, this
When static switch be segmented, alternating current-direct current mixing microgrid be smoothly transitted into it is straight hand over the operation of small-power operational mode surely, energy storage is straight using determining
Busbar voltage control, many two-way AC/DC converter Controls ac bus frequencies and voltage are flowed, and is changed in many two-way AC/DC
Flow the electric current flowed through in the AC current control link of device before the segmentation of compensation static switch.
Described Secondary Control is that alternating current-direct current mixing microgrid detects grid-connected when directly handing over high-power operational mode to run surely
After signal, frequency modulation frequency modulation is carried out to ac bus frequency in the inspection same period by many controllers from two-way AC/DC transverters, adjusted
It is whole to frequency standard value, and close static switch；After alternating current-direct current mixing micro-grid connection, bulk power grid symmetrical alternating current area power makes
The power reduction transmitted on many two-way AC/DC transverters returns to holding state to zero, and energy storage charge-discharge electric power reduces and only
DC area power-balance is kept, alternating current-direct current mixing microgrid after discharge and recharge limit value is reset and completes directly to hand over high-power operation mould surely
Formula takes over seamlessly to autonomous operation pattern.
The alternating current-direct current mixing microgrid multi-mode operation control method for coordinating and smooth-switching method of the present invention, can be according to friendship
Direct current mixing microgrid practical operation situation adjusts flow of power, on the premise of system burning voltage and frequency stabilization is ensured, subtracts
Small grid-connected transient voltage and rush of current with off-network mode handover procedure, improves the quality of power supply of system.The present invention is set
DC bus-bar voltage deviation threshold and ac bus frequency departure threshold value are put, many two-way AC/DC transverters settings is equivalent to and closes
Lock is interval, it is to avoid in microvariations, trend frequently changes, and improves the efficiency of bi-directional inverter transimission power, reduces the straight tide of friendship
The power attenuation in flow section area.The limitation of energy storage charge-discharge electric power is set, and energy storage discharge and recharge is climbed when eliminating microgrid high-power fluctuation
Ratio of slope deficiency problem, while ensure that energy storage maintains larger state-of-charge, sufficient residual capacity can when being conducive to off-grid operation
For allotment and it is long when run.It is proposed by the present invention when taking over seamlessly when control method reduces off-network DC bus-bar voltage and be grid-connected
The moment impact of ac bus frequency, it is to avoid caused chugging during many two-way AC/DC transverters conversion and control strategies,
Realize alternating current-direct current mixing microgrid multi-mode to take over seamlessly, improve the stability and dynamic response of system.
Brief description of the drawings
Fig. 1 is alternating current-direct current mixing microgrid partitioned organization schematic diagram；
Fig. 2 is alternating current-direct current mixing microgrid model equivalent topologies circuit diagram；
Fig. 3 a are that the two-way DC/DC transverters of energy storage determine DC voltage-limit power control profile figure；
Fig. 3 b are many two-way AC/DC transverters DC voltage deviation droop control curve maps；
Fig. 4 is two-way DC/DC inverter controllers structural representation；
Fig. 5 is DC voltage deviation droop control device structural representation；
Fig. 6 a are that main two-way AC/DC transverters determine a-c cycle controlling curve figure；
Fig. 6 b are many from transverter a-c cycle deviation droop control curve map；
Fig. 7 is a-c cycle deviation droop control structural representation；
Fig. 8 is alternating current-direct current mixing micro-grid connection and off-grid operation handoff procedure；
Fig. 9 is that grid-connect mode two is switched to the conversion timing sequence process of off-network pattern three；
Figure 10 is that off-network pattern four is switched to the conversion timing sequence process of grid-connect mode one；
Figure 11 is that case of the present invention arranges the alternating current-direct current mixing microgrid equivalent circuit used；
Figure 12 is case from simulation result of the pattern switching to off-grid operation pattern that be incorporated into the power networks；
Figure 13 is simulation result of the case from off-grid operation pattern switching to the pattern of being incorporated into the power networks.
Embodiment
With reference to embodiment and accompanying drawing to the alternating current-direct current mixing microgrid multi-mode operation control method for coordinating of the present invention and
Smooth-switching method is described in detail.
The alternating current-direct current mixing microgrid multi-mode operation control method for coordinating of the present invention, is changed applied to many two-way AC/DC
The multi-mode operation of stream device and the two-way DC/DC transverters of energy storage coordinates control and the method taken over seamlessly, and described method includes：
Alternating current-direct current mixing microgrid is divided into exchanging area, hands over straight trend section area and DC area；Alternating current-direct current mixing micro-grid connection operation when according to
It is divided into autonomous operation pattern and the straight operational modes of Jiao Ding according to the degree of DC area unbalanced power amount；Alternating current-direct current mixing microgrid from
During network operation, two-way AC/DC transverters based on one in many two-way AC/DC transverters are selected, remaining is from two-way AC/
Operational mode, is divided into and directly hands over small-power operational mode surely by DC transverters according to the number of units difference that two-way AC/DC transverters are accessed
High-power operational mode is directly handed over surely.
In autonomous operation pattern, the DC area unbalanced power amount of alternating current-direct current mixing microgrid is less than the charge and discharge electric work of energy storage
Rate limit valueThe two-way DC/DC transverters of energy storage maintain direct current female using the control mode for determining DC bus-bar voltage-limit power
Line voltage is constant, and many two-way AC/DC transverters are in holding state；When handing over fixed straight operational mode, alternating current-direct current mixing microgrid
DC area unbalanced power amount is more than or equal to the charge-discharge electric power limit value of energy storageEnergy storage is with charge-discharge electric power limit value
Output-constant operation, many two-way AC/DC transverters are straight come constant alternating current-direct current mixing microgrid using DC voltage deviation droop control
Flow busbar voltage.
Described autonomous operation pattern and the straight operational modes of Jiao Ding are according to the charge-discharge electric power limit value of settingAnd direct current
Busbar voltage deviation thresholdFree switching operational mode；Specifically, charge-discharge electric power limit value is reached in energy storageWhen,
There is DC bus-bar voltage deviation, when reaching default voltage deviation threshold valueAfterwards, start many two-way AC/DC transverters
Operation, carrys out stable DC busbar voltage；When DC area unbalanced power amount reduce and DC bus-bar voltage deviation be decreased to automatically
Charge-discharge electric power limit valueWhen, and DC bus-bar voltage deviation is decreased to voltage deviation threshold valueInterior, then energy storage is from permanent work(
Rate operation, which is automatically reverted to, determines the operation of DC bus-bar voltage-limit Power Control, and many two-way AC/DC transverters are exited, in treating
Machine state.
Exchanging area unbalanced power amount is less than main two-way AC/DC transverters capacityOnly lead two-way AC/DC transverters
Using ac bus frequency-voltage control is determined, remaining is in holding state from two-way AC/DC transverters；It is high-power directly handing over surely
During operational mode, exchanging area unbalanced power amount exceedes main two-way AC/DC transverters capacityMain two-way AC/DC transverters
Output-constant operation, many use frequency departure droop control from two-way AC/DC transverters.
It is described it is straight hand over small-power operational mode surely and directly hand over high-power operational mode surely, according to leading the two-way AC/DC changes of current
Device capacityWith ac bus frequency departure threshold valueFree switching operational mode, be specifically：In the main two-way AC/DC changes of current
Device transimission power exceedes capacity limit valueWhen, there is deviation in ac bus frequency, reach after frequency departure threshold value many from
Two-way AC/DC transverters startup optimization, comes symmetrical alternating current area power and maintenance voltage and frequency-invariant；When working conditions change so that handing over
When flowing area's frequency departure less than deviation threshold, many are exited in holding state from two-way AC/DC transverters, main two-way AC/DC
Transverter is automatically reverted to from output-constant operation determines ac bus frequency-voltage control operation.
The smooth-switching method based on alternating current-direct current mixing microgrid multi-mode operation control method for coordinating of the present invention, is to pass through
Secondary Control is carried out successively to the DC bus-bar voltage and ac bus frequency of alternating current-direct current mixing microgrid and trend is calmed down, makes friendship straight
Stream mixing microgrid is realized from handing over fixed straight operational mode to directly handing over small-power operational mode to take over seamlessly surely, makes the high-power fortune of Zhi Dingjiao
Row mode switches to autonomous operation mode smooth.
Described Secondary Control is that alternating current-direct current mixing microgrid detects off-network signal when handing over fixed straight operational mode operation
Afterwards, secondary pressure regulation is carried out to DC bus-bar voltage in the inspection same period by the controller of many two-way AC/DC transverters to adjust to electricity
Standard value is pressed, and charge-discharge electric power limit value is cancelled in energy storageAfter Secondary Control is completed, energy storage increase charge-discharge electric power is protected
DC area power-balance is held, makes the power reduction transmitted on many two-way AC/DC transverters to zero, returns to holding state, this
When static switch STS segmentation, alternating current-direct current mixing microgrid be smoothly transitted into it is straight hand over the operation of small-power operational mode surely, energy storage is using determining
DC bus-bar voltage is controlled, many two-way AC/DC converter Controls ac bus frequencies and voltage, and in many two-way AC/DC
The electric current flowed through before static switch segmentation is compensated in the alternating current current control link of transverter.
Described Secondary Control is that alternating current-direct current mixing microgrid detects grid-connected when directly handing over high-power operational mode to run surely
After signal, frequency modulation frequency modulation is carried out to cocurrent bus frequency in the inspection same period by many controllers from two-way AC/DC transverters, adjusted
It is whole to frequency standard value, and close static switch；After alternating current-direct current mixing micro-grid connection, bulk power grid symmetrical alternating current area power makes
The power reduction transmitted on many two-way AC/DC transverters returns to holding state to zero, and energy storage charge-discharge electric power reduces and only
DC area power-balance is kept, alternating current-direct current mixing microgrid after discharge and recharge limit value is reset and completes directly to hand over high-power operation mould surely
Formula takes over seamlessly to autonomous operation pattern.
Further illustrate that the alternating current-direct current mixing microgrid multi-mode operation of the present invention coordinates control and smooth below in conjunction with the accompanying drawings
Switching method.
Fig. 1 be AC coupled type low-voltage AC/DC mixing micro-grid system structure of the present invention, be divided into exchanging area, directly
Liu Qu and the straight part of trend section area three of friendship.Opened comprising photovoltaic generation, wind-power electricity generation, AC load and grid-connected static state exchanging area
Close, DC area also includes DC load, energy-storage units in addition to distributed generation unit.Hand over straight trend section area two-way by many
AC/DC transverters, wave filter on AC side and DC bus capacitor ancestral are constituted.Fig. 2 is example alternating current-direct current mixing microgrid of the invention etc.
Imitate model topology circuit, uIC,abc, iIC,abcTo pass through the filtered AC three-phase voltage of wave filter on AC side and electric current, uIC, iIC
For the DC voltage and electric current after DC bus capacitor, uC, iCExported after being converted for energy-storage system through two-way DC/DC transverters
DC voltage and electric current, iB,abc, udcRespectively ac bus electric current and DC bus-bar voltage, described alternating current-direct current mixing microgrid
It is divided into according to the state of static switch and is incorporated into the power networks and off-grid operation.
1st, it is incorporated into the power networks
Bulk power grid can be equivalent to infinitely great power supply when being incorporated into the power networks, the voltage and frequency of alternating current-direct current mixing microgrid exchanging area by
Bulk power grid is clamped down on, the energy balance relations when changed power of each unit can break system original stable operation in direct current region, makes friendship
Direct current mixing microgrid runs on different working modes, and system is divided into autonomous operation mould by the degree difference according to unbalanced power amount
Formula and the straight operational modes of Jiao Ding.Described autonomous operation pattern, is the continuous unstable of the regenerative resources such as consideration photovoltaic, blower fan
The randomness of output and load causes DC area power to there is real-time disturbance, while considering the error of signal in each micro- source controller
Delay and control accuracy are not enough, and power and DC bus-bar voltage are fluctuated up and down near the standard value of setting, when alternating current-direct current mixing
The DC area unbalanced power amount of microgrid is less than the charge-discharge electric power limit value of energy storageWhen, the unbalanced power amount can pass through
Energy storage absorbs/released energy the power-balance for realizing DC area itself and DC bus-bar voltage is stable, i.e., many two-way AC/DC are changed
Flow device and holding state is according to predetermined voltage threshold, storage energy operation, which is used, determines DC voltage-limit Power Control.It is described to hand over fixed straight
During operational mode, it is characterized in that considering Large Copacity load variations and the micro- source power output cataclysm in DC area, make alternating current-direct current mixing micro-
The unbalanced power amount for netting DC area exceedes the charge-discharge electric power limit value of energy storageClimb because energy storage power output is present
Rate problem, it is impossible to quick regulation DC area power swing, now many two-way AC/DC transverters can be rapidly according to DC area network
Voltage change adjustment power output, DC area power is balanced so as to stable DC busbar voltage by rectification and inversion, that is, stored up
Energy invariable power discharge and recharge operation, many two-way AC/DC transverters use DC voltage deviation droop control.
Fig. 3 a and Fig. 3 b are that DC bus-bar voltage of the present invention coordinates controlling curve figure.Wherein,
Fig. 3 a are that the two-way DC/DC transverters of energy storage determine DC voltage-limit power control profile figure, according to characteristic curve, and
During network operation after voltage-regulation ring design power limiter, limit electric current loop reference valueCancel power limit during off-grid operation
Fixed, the controller architecture of two-way DC/DC transverters is as shown in Figure 4.
Fig. 3 b are many two-way AC/DC transverters DC voltage deviation droop control curve maps, and Fig. 5 is DC voltage deviation
Droop control device structure；△udcFor reality between two-way AC/DC Converter DC-sides capacitance group voltage and dc bus standard value
Voltage deviation.SUFor logic selecting switch, contrast potential deviation actual value and voltage deviation threshold value select different enable signals will
Electric current d-axis reference signalThe alternating current governing loop of many two-way AC/DC transverters is handed down to, controls two-way AC/DC to change
Stream runs on holding state and the sagging operation of direct current, and its logic selecting type is:
DC voltage droop control is with DC bus-bar voltage deviation compensation controlling unit expression formula：
Wherein, RIC,iFor the different two-way sagging slopes of AC/DC transverters outer shroud, virtual internal driving is equivalent to, with electric capacity
Group electric current, which is multiplied, constitutes output voltage feedforward.For voltage deviation compensate, reduce by energy storage determine voltage control be transitioned into it is two-way
Caused voltage deviation during AC/DC transverter droop controls.Due to hand over straight trend section can transmitted in both directions energy, therefore voltage is inclined
Poor direction is different, SdFor 1 when represent that operating point voltage ratio standard value is high, two-way AC/DC transverters inverter operation, on the contrary when then table
Show that rectification is run.
2nd, off-grid operation
Under off-network pattern, in alternating current-direct current mixing microgrid energy storage as unique stabilized power source, it is necessary to bear whole microgrid
Power-balance and system are stable, and ensure important AC load, DC load normal power supply.Microgrid DC area is filled by energy storage all the time
Electric discharge maintenance power-balance and DC bus-bar voltage are constant, and its grid integration point is DC area balance nodes；Exchanging area is then needed
Will be by handing over straight trend section to stabilize exchanging area power swing and control ac bus frequency/voltage, its AC grid entry point is
For exchanging area balance nodes.Because photovoltaic, blower fan, load power have strong randomness, the power of straight trend section area transmission is handed over
Size real-time change and can not accurately predict, it is necessary to according to the power grade of two-way AC/DC transverters carry out reasonable distribution, foundation
The number of units of two-way AC/DC transverters access is different, and alternating current-direct current mixing microgrid is divided into the straight small-power fortune of friendship surely under off-network pattern
Row mode and high-power operational mode is directly handed over surely.It is described straight when handing over small-power operational mode surely, exchanging area unbalanced power amount
Less than main two-way AC/DC transverters capacityTwo-way AC/DC transverters are only led to control using ac bus frequency-voltage is determined
Ac bus voltage and frequency, remaining is in holding state from two-way AC/DC transverters.It is described directly to hand over high-power operational mode surely
When, exchanging area unbalanced power amount exceedes main two-way AC/DC transverters capacityMain two-way AC/DC transverters invariable power fortune
OK, many use frequency departure droop control from two-way AC/DC bi-directional inverters, are made by adjusting active power and reactive power
Exchanging area reaches power-balance state.
Fig. 6 a and Fig. 6 b are ac bus frequency coordination controlling curve figures of the present invention.Wherein,
Two-way AC/DC transverters determine a-c cycle controlling curve figure based on Fig. 6 a, control the exchanging area frequency to be all the time
Voltage is
Fig. 6 b be many from two-way AC/DC transverters a-c cycle deviation droop control curve map, Fig. 7 is many from two-way
AC/DC transverter a-c cycle deviation droop control structural representations.
Take the three-phase current i on wave filter on AC sideIC,abcWith three-phase voltage uIC,abc, calculate and be sent to the active of exchanging area
Power and reactive power, as the feedback power of exchange droop control after being filtered by low-pass first order filter, formula is：
Wherein：ωpFor low pass filter corner frequency.In parallel many are uneven to exchanging area from two-way AC/DC transverters
The power that weighs is divided in portion, and is exchanged sagging and deviation compensation expression formula and is：
Wherein：Respectively ac bus standard frequency and standard voltage value, mIC, i and nIC, i is respectively difference
From the two-way sagging coefficient of AC/DC frequency inverters and the sagging coefficient of voltage,Sagging active power and nothing are exchanged respectively
Work(value and power reference, default setting is 0.For frequency departure threshold value, the main two-way AC/DC converter powers of compensation exceed specified
The frequency departure produced during capacity.Sagging link calculates output real-time voltage reference value EICWith reference phase θICAfterwards, electricity is generated
Pressure instruction expression formula be：
Obtained result is controlled by voltage regulator and current regulator no error following, and many from the two-way AC/DC changes of current
The identical a-c cycle of device parallel output and voltage.
Fig. 8 is that alternating current-direct current mixing micro-grid connection is analyzed with off-grid operation handoff procedure, and methods described illustrates grid-connected and off-network
Process is taken over seamlessly during different operational mode switchings.
1st, fixed straight operational mode is handed over to be switched to straight friendship small-power operational mode surely
Many two-way AC/DC transverters adopt same DC voltage deviation droop control, direct current when handing over fixed straight operational mode operation
Busbar voltage is naturally drooped along sagging curve, and the difference with bus standard value is：
Microgrid enters the inspection same period after microgrid central controller detects off-network switching signal, and power limit is cancelled in energy storage,
And DC bus-bar voltage is controlled alone.Due to the presence of voltage difference, DC bus-bar voltage needs secondary pressure regulation to be adjusted to standard
Value.The regulation of conventional electric power secondary system is simulated, can be by adjusting the reference voltage levels of many two-way AC/DC transverters sagging curves
Realize, its regulated quantity size is equal with voltage deviation amount, and regulated quantity is positive and negative relevant with power transmission direction, i.e. the lower whip of inversion section
Line moves down △ udc, right side rectification section sagging curve moves up △ udc, retrieving reference voltage expression formula is：
I-th two-way AC/DC transverter for specifically participating in secondary pressure regulation adjusts process as shown in Figure 3 b, and solid line is that voltage is inclined
Poor sagging curve, two-way AC/DC transvertersiIt is operated at rectification operating point A, shares active-power PIC,i, each two-way AC/DC
Transverter output DC bus-bar voltage is uIC, now microgrid dc bus drop △ udc, detect after off-network signal, upwards
Translate sagging curve, i.e., microgrid central controller adjust reference voltage toSo that two-way AC/DC inverter output voltagesIt is operated in new operating point B.
DC bus-bar voltage runs on standard value, but two-way AC/DC transverters i still transimission powers after secondary pressure regulation
PIC,i, direct switching control strategy can cause power big ups and downs.Now handing over the power in straight trend section area can be increased by energy storage
Big charge-discharge electric power calms down, so as to balance DC area power.Energy storage is each two-way AC/DC calming down phase power output change value
The general power of transverter transmission, i.e.,：
Treat that two-way AC/DC transverters transimission power is decreased to zero and is returned to holding state, i.e., be transitioned into O points from operating point B,
Now static switch is segmented, microgrid off-grid operation, and main two-way AC/DC transverters, which can be switched to directly, determines a-c cycle-voltage control
The power in bulk power grid symmetrical alternating current area when making, and considering to be incorporated into the power networks, that is, compensate the electric current flowed through before off-network from static switch, press
Current reference value in each controller current regulation loop is distributed to according to the capacity of each two-way AC/DC transverter, it is to avoid exchanging area work(
Rate is fluctuated.The grid-connected specific regulation process for being switched to the different sequential of off-network is as shown in Figure 9.
2nd, the high-power operational modes of Zhi Dingjiao are switched to autonomous operation pattern
DC bus-bar voltage control stable DC area, main two-way AC/ are determined in energy storage when directly handing over high-power operational mode operation surely
DC transverters are with maximum power output, and many use a-c cycle deviation droop control, ac bus from two-way AC/DC transverters
Real-time frequency is with standard frequency difference
When microgrid central controller detects grid-connected switching signal, because ac bus needs and the direct phase of bulk power grid
Even, therefore in the inspection same period frequency modulation frequency modulation is needed to recover bus frequency to standard value.Many are directly translated from two-way AC/DC transverters
Sagging curve changes the reference value of frequency, and the frequency reference expression formula after renewal is：
Inversion section direction is taken during off-grid operation for just, positive direction during with being incorporated into the power networks is on the contrary, therefore adjustment amount Sd△facTake
It is negative to be worth.I-th of frequency modulation frequency modulation is participated in from two-way AC/DC transverters adjustment process as shown in Figure 6 b, i-th from two-way AC/
DC transverters are operated at inverter operation point C, and the active power for being transferred to exchanging area is PIC,i, each from the two-way AC/DC changes of current
The frequency that device droop control is obtained is fIC, drop amount is △ fac.In order that ac bus frequency and bulk power grid standard frequency
It is equal, sagging curve is translated up to operating point D by adjusting microgrid central controller, now fIC=50Hz.
Static switch is closed after frequency modulation frequency modulation, and exchanging area equalization point is grid-connected from many two-way AC/DC transverters ACs
Point is transferred to the grid entry point of alternating current-direct current mixing microgrid and bulk power grid, and the smooth symmetrical alternating current area power of bulk power grid so that hand over straight tide
Flow section area power is gradually decrease to zero, i.e., it is total to be transitioned into bulk power grid compensation power in operating point O, handoff procedure from operating point D
Measure and be：
Alternating current-direct current mixing microgrid is with autonomous operation mode operation after the completion of taking over seamlessly, at many two-way AC/DC transverters
In holding state, energy storage only stable DC area power-balance, and reset power threshold.Off-network is switched to grid-connected different sequential
Specific regulation process it is as shown in Figure 10.
Finally, the validity and feasibility for coordinating control and smooth-switching method are put forward for checking, according to Figure 11
Alternating current-direct current mixing microgrid equivalent circuit carries out the simulating, verifying of different mode switching in MATLAB/Simulink platforms, chooses straight
Stream busbar voltage is 560V, and ac bus voltage is 10kV, and the rated capacity of three two-way AC/DC transverters is 250kVA,
Stored energy capacitance is 1MWh, sets energy storage charge-discharge electric power limit valueFor 50kW, predetermined DC voltage deviation thresholdFor
6V, presets ac bus frequency departure threshold valueFor 0.1Hz.2 kinds of operating modes verify that alternating current-direct current mixing microgrid proposed by the present invention is more
Mode operation control method for coordinating and smooth-switching method.
Operating mode 1：When the stable autonomous operation of system grid connection is to 0.5s, DC load is uprushed 450kW, when running to 1.1s, is handed over
Direct current mixing microgrid receives off-network signal, and the simulation experiment result is as shown in figure 12.
From simulation result as can be seen that when DC load is uprushed, DC bus-bar voltage appearance is larger to be fallen, and three two-way
AC/DC transverters take DC voltage deviation droop control share automatically DC area active power it is uneven and direct current is female
Line voltage is stable in 540V.Three two-way AC/DC transverters are identical due to capacity, and sagging coefficient sets identical, after system is stable
The active power of transmission is 150kW.After 0.2s dynamic change, alternating current-direct current mixing microgrid is to hand over surely straight mode operation.
After 1.1s detects off-network signal, power limit is cancelled in energy storage, is done directly the power-balance of DC area power, that is, stabilizes
The power of straight trend section transmission is handed over, now DC bus-bar voltage returns to standard value 560V, three two-way AC/DC transverters are passed
Defeated power is zero.After static switch disconnects, main two-way AC/DC transverters transmit -100kW power from DC area to exchanging area, by
Exchanging area power-balance need to absorb energy storage after 100kW, therefore off-network from bulk power grid when being incorporated into the power networks need to provide power back-off
Exchanging area power shortage, now system takes over seamlessly directly hands over small-power operation surely.
Operating mode 2：System off-network is stable straight when handing over the small-power to run to 2s surely, and AC load is uprushed 350kW, operation to 3s
When, alternating current-direct current mixing microgrid receives grid-connected signal, and the simulation experiment result is as shown in figure 13.
From simulation result as can be seen that when AC load is uprushed, ac bus frequency moment is fallen, two-way at three
AC/DC transverters are simultaneously after initiation culture deviation droop control, and two-way AC/DC transverters transmit -150kW, and frequency reduces
To 49.7Hz, energy storage active power of output increases to 470kW, after 0.2s is adjusted, and system directly hands over high-power operation surely.In 3s
When system detectio to grid-connected signal, ac bus frequency is recovered after frequency modulation frequency modulation to 50Hz, and now static switch is closed, big electricity
Direct symmetrical alternating current area power is netted, three two-way AC/DC transverters transimission powers are decreased to zero and are in holding state, complete transition
Energy storage power output is decreased to 20kW afterwards, and system is taken over seamlessly to autonomous operation pattern.
Claims (8)
1. a kind of alternating current-direct current mixing microgrid multi-mode operation control method for coordinating, it is characterised in that be to be applied to many two-way AC/
The multi-mode operation of DC transverters and the two-way DC/DC transverters of energy storage coordinates control and the method taken over seamlessly, described method
Including：Alternating current-direct current mixing microgrid is divided into exchanging area, hands over straight trend section area and DC area；In alternating current-direct current mixing micro-grid connection operation
When be divided into autonomous operation pattern and the straight operational modes of Jiao Ding according to the degree of DC area unbalanced power amount；Mix micro- in alternating current-direct current
During net off-grid operation, two-way AC/DC transverters based on one in many two-way AC/DC transverters are selected, remaining is from double
To AC/DC transverters, operational mode is divided into the straight small-power of friendship surely according to the number of units difference that two-way AC/DC transverters are accessed and run
Pattern and high-power operational mode is directly handed over surely.
2. alternating current-direct current mixing microgrid multi-mode operation according to claim 1 coordinates control and smooth-switching method, it is special
Levy and be, in autonomous operation pattern, the DC area unbalanced power amount of alternating current-direct current mixing microgrid is less than the charge and discharge electric work of energy storage
Rate limit valueThe two-way DC/DC transverters of energy storage maintain direct current female using the control mode for determining DC bus-bar voltage-limit power
Line voltage is constant, and many two-way AC/DC transverters are in holding state；When handing over fixed straight operational mode, alternating current-direct current mixing microgrid
DC area unbalanced power amount is more than or equal to the charge-discharge electric power limit value of energy storageEnergy storage is with charge-discharge electric power limit value
Output-constant operation, many two-way AC/DC transverters are straight come constant alternating current-direct current mixing microgrid using DC voltage deviation droop control
Flow busbar voltage.
3. alternating current-direct current mixing microgrid multi-mode operation according to claim 2 coordinates control and smooth-switching method, it is special
Levy and be, described autonomous operation pattern and the straight operational modes of Jiao Ding are according to the charge-discharge electric power limit value of settingAnd direct current
Busbar voltage deviation thresholdFree switching operational mode；Specifically, charge-discharge electric power limit value is reached in energy storageWhen, go out
Existing DC bus-bar voltage deviation, when reaching default voltage deviation threshold valueAfterwards, many two-way AC/DC transverters are made to start fortune
OK, stable DC busbar voltage is carried out；When DC area, unbalanced power amount is decreased to charge-discharge electric power limit valueIt is interior, and direct current
Busbar voltage deviation is decreased to voltage deviation threshold valueInterior, then energy storage is automatically reverted to from output-constant operation determines dc bus electricity
Pressure-limit Power Control operation, many two-way AC/DC transverters are exited, in holding state.
4. alternating current-direct current mixing microgrid multi-mode operation according to claim 1 coordinates control and smooth-switching method, it is special
Levy and be, when directly handing over small-power operational mode surely, exchanging area unbalanced power amount is less than main two-way AC/DC transverters capacityTwo-way AC/DC transverters are only led using ac bus frequency-voltage control is determined, remaining is at two-way AC/DC transverters
In holding state；When directly handing over high-power operational mode surely, exchanging area unbalanced power amount exceedes main two-way AC/DC transverters and held
AmountMain two-way AC/DC transverters output-constant operation, many use frequency departure droop control from two-way AC/DC transverters.
5. alternating current-direct current mixing microgrid multi-mode operation according to claim 4 coordinates control and smooth-switching method, it is special
Levy and be, it is described it is straight hand over small-power operational mode surely and directly hand over high-power operational mode surely, according to leading two-way AC/DC transverters
CapacityWith ac bus frequency departure threshold valueFree switching operational mode, be specifically：In main two-way AC/DC transverters
Transimission power exceedes capacityWhen, there is deviation in ac bus frequency, and described deviation reaches frequency departure threshold valueAfterwards,
Many, from two-way AC/DC transverters startup optimization, are come symmetrical alternating current area power and maintenance voltage and frequency-invariant；Work as working conditions change
So that exchanging area frequency departure is less than deviation thresholdWhen, many are exited in holding state from two-way AC/DC transverters, main
Two-way AC/DC transverters are automatically reverted to from output-constant operation determines ac bus frequency-voltage control operation.
6. a kind of side of taking over seamlessly for seeking the alternating current-direct current mixing microgrid multi-mode operation control method for coordinating described in 1 based on right
Method, it is characterised in that carried out successively respectively by the DC bus-bar voltage and ac bus frequency to alternating current-direct current mixing microgrid
Secondary Control and trend are calmed down, and alternating current-direct current mixing microgrid is realized from fixed straight operational mode is handed over to directly handing over small-power operational mode surely
Take over seamlessly, the high-power operational modes of Zhi Dingjiao is switched to autonomous operation mode smooth.
7. the side according to claim 6 of taking over seamlessly based on alternating current-direct current mixing microgrid multi-mode operation control method for coordinating
Method, it is characterised in that described Secondary Control is that alternating current-direct current mixing microgrid detects off-network when handing over fixed straight operational mode operation
After signal, secondary pressure regulation, adjustment are carried out to DC bus-bar voltage in the inspection same period by the controller of many two-way AC/DC transverters
To standard voltage value, and charge-discharge electric power limit value is cancelled in energy storageAfter Secondary Control is completed, energy storage increase charge and discharge electric work
Rate keeps DC area power-balance, makes the power reduction transmitted on many two-way AC/DC transverters to zero, returns to standby shape
State, now static switch segmentation, alternating current-direct current mixing microgrid is smoothly transitted into the straight operational mode operation of friendship small-power surely, and energy storage is used
Determine DC bus-bar voltage control, many two-way AC/DC converter Controls ac bus frequencies and voltage, and in many two-way AC/
The electric current flowed through before static switch segmentation is compensated in the AC current control link of DC transverters.
8. the smooth-switching method of alternating current-direct current mixing microgrid multi-mode operation control method for coordinating according to claim 6,
Characterized in that, described Secondary Control is when directly handing over high-power operational mode to run surely, alternating current-direct current mixing microgrid is detected
After grid-connected signal, secondary adjust is carried out to ac bus frequency in the inspection same period by many controllers from two-way AC/DC transverters
Frequently, adjust to frequency standard value, and close static switch；After alternating current-direct current mixing micro-grid connection, bulk power grid symmetrical alternating current area work(
Rate, makes the power reduction transmitted on many two-way AC/DC transverters to zero, returns to holding state, energy storage charge-discharge electric power subtracts
It is small and only keep DC area power-balance, reset after discharge and recharge limit value the completion of alternating current-direct current mixing microgrid and directly hand over high-power surely
Operational mode takes over seamlessly to autonomous operation pattern.
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| CN108631293A (en) * | 2018-05-24 | 2018-10-09 | 山东大学 | A kind of direct current distribution DC/DC converters operational mode and control method |
| CN109586275A (en) * | 2018-10-18 | 2019-04-05 | 清华大学 | The quick start method and device of alternating current-direct current combined hybrid system electromagnetic transient simulation |
| CN109586275B (en) * | 2018-10-18 | 2020-07-07 | 清华大学 | Quick starting method and device for electromagnetic transient simulation of alternating current-direct current hybrid system |
| CN109193611A (en) * | 2018-10-29 | 2019-01-11 | 贵州电网有限责任公司 | A kind of multiple-energy-source DC micro-electric network construction method based on electric car |
| CN109617075A (en) * | 2018-12-13 | 2019-04-12 | 天津大学 | A kind of control method of multi-function double-way power inverter |
| CN110212512B (en) * | 2019-04-26 | 2020-12-18 | 中国南方电网有限责任公司 | Method and device for coordinated control of frequency of double-end direct-current asynchronous interconnected power grid |
| CN110212512A (en) * | 2019-04-26 | 2019-09-06 | 中国南方电网有限责任公司 | Both-end HVDC asynchronous interconnection power grids frequency coordination control method and device |
| CN110570028A (en) * | 2019-08-22 | 2019-12-13 | 国电南瑞科技股份有限公司 | Method for switching integrated energy system grid-connected mode to emergency autonomous mode |
| CN111245000A (en) * | 2020-01-17 | 2020-06-05 | 华北电力大学（保定） | Based on H∞Micro-grid output quantity feedback optimal decentralized coordination control method for indexes |
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| CN111711196A (en) * | 2020-07-03 | 2020-09-25 | 浙江大学 | Seamless switching control method for operation modes of alternating current-direct current hybrid power distribution network |
| CN111711196B (en) * | 2020-07-03 | 2021-08-13 | 浙江大学 | Seamless switching control method for operation modes of alternating current-direct current hybrid power distribution network |
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