CN108539729A - The control method for coordinating of direct-current grid is stored up based on island mode light - Google Patents
The control method for coordinating of direct-current grid is stored up based on island mode light Download PDFInfo
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- CN108539729A CN108539729A CN201810434571.4A CN201810434571A CN108539729A CN 108539729 A CN108539729 A CN 108539729A CN 201810434571 A CN201810434571 A CN 201810434571A CN 108539729 A CN108539729 A CN 108539729A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
Abstract
The present invention relates to a kind of control method for coordinating storing up direct-current grid based on island mode light, and asymmetric fuzzy control has been used to optimize MPPT maximum power point tracking control.Then, due in DC micro power grid system, front photovoltaic part has used improved MPPT maximum power point tracking to control, but itself and be not directly involved in the control of system busbar voltage, it proposes that the logic module being made of two Boolean quantities α, β goes the different operating statuses of choice energy-storage units, is run by energy-storage units control bus voltage stabilization.Last compositive index photovoltaic and energy-storage system operation characteristic, use a kind of two-stage segmented control strategy, the information carrier that busbar voltage is acted as energy-storage system, voltage is divided into five blocks simultaneously, size of the energy-storage system according to the DC bus-bar voltage and state-of-charge according to energy-storage units independently switches charging and discharging state.This method realizes the economic and reliable operation of DC micro power grid system on the whole, and collaboration efficiency improves between DC micro power grid system.
Description
Technical field
The present invention relates to a kind of direct-current grid control technologies, more particularly to a kind of to store up DC micro-electric based on island mode light
The control method for coordinating of net.
Background technology
The shortage of the economy and society rapid development in current China, the energy is also more prominent, in order to allow one to efficiently
Using the energy, micro-capacitance sensor is taken advantage of a situation.The development of micro-capacitance sensor photovoltaic panel, energy-storage battery, DC load etc. simultaneously so that these are straight
Streaming distributed generation resource has peculiar advantage for industrial DC load.So stablizing fortune in relation to direct-current grid in recent years
Row is just gradually becoming the hot spot that researchers are studied.For ensure direct-current grid stable operation and green energy resource it is efficient
It uses, and based on the research of the energy compatibility control strategy of independent direct current micro-capacitance sensor.
Nowadays photovoltaic maximum power point tracks, and has the MPPT maximum power point tracking mppt controlled based on neural networks sliding mode
Algorithm, its feature are based on advanced control theory, but when solar panel is variant, parameter is just different, operation fiber crops
Tired, the training time is long.Also the MPPT maximum power point tracking state for proposing and impedance and multi-mode being combined is applied to micro-capacitance sensor
The coordination control strategy of power, still, this mode can cause energy-storage battery in situation unbalance in face of system power, occur compared with
The starting of high-frequency switching, system converter is also also easy to produce harmonic wave, while can also cut down the working life of energy-storage travelling wave tube.And
Photovoltaic system inside general light storage direct-current grid has different running method and the process of transformation, but does not provide direct current
Between micro-grid system how the complete method of coordinated allocation energy.Also there is the droop control for proposing the adaptive coefficient of strain, go reality
The Effec-tive Function of existing battery source, but do not consider to carry out switchback in relation to control method caused by the fluctuation on system busbar voltage
The problem of changing.It is therefore proposed that a kind of new coordination control strategy so that photovoltaic efficiency is higher, while being coordinated using segmented
Control strategy reduces the frequent switching of energy-storage system, improves the working life of energy-storage battery, and balanced light stores up DC micro power grid system
Between power, effectively reduce busbar voltage fluctuation, realize the reliable and stable operation of independent direct current micro-capacitance sensor, just seem with extremely
Important role and meaning.
Invention content
The present invention be directed under island mode direct-current grid control there are the problem of, it is proposed that one kind be based on isolated island mould
Formula light store up direct-current grid control method for coordinating, can ensure light store up DC micro power grid system stable operation under the premise of,
So that photovoltaic efficiency is higher, while segmented coordination control strategy can reduce the frequent switching of energy-storage system, improve storage
The working life of energy battery, balanced light store up the power between DC micro power grid system, effectively reduce busbar voltage fluctuation.
The technical scheme is that：A kind of control method for coordinating storing up direct-current grid based on island mode light, including
To DC/DC converters, DC loads, photovoltaic source connects direct current by the unidirectional DC/DC converters of PV for photovoltaic source, energy-storage battery, mono-/bis-
Busbar, energy-storage battery connect DC bus by the two-way DC/DC converters of Battery, and DC bus powering load coordinates control
Including following sections：
1) photovoltaic source：MPPT maximum power point tracking control carries out it using asymmetric fuzzy controller, asymmetric obscure is patrolled
Collecting controller input quantity is respectively：The ratio and error of the variable quantity of the output power from photovoltaic cells P and the variable quantity of output voltage v
Change rate Δ e, the expression formula at two input value kth moment are as follows：
Δ e (k)=e (k)-e (k-1) (2)
Wherein P (k), v (k) are that the output power and voltage at photovoltaic cell current k moment can in very short time respectively
E (k) to be regarded as to the slope of P-U characteristic curves certain point；
The output controlled quentity controlled variable of asymmetric fuzzy logic controller is voltage-regulation amount dv；
2) energy-storage battery：The logic selecting module constituted using two Boolean quantities α, β goes the work of choice energy-storage battery group
Pattern, logic selecting module take the specified busbar voltage reference value V of direct currentdc-refWith the instantaneous value V of voltage on busbardcIt compares,
That is Vdc-refWith VdcIt compares, is as a result denoted as the value of Boolean quantity α, α=Vdc-Vdc-ref；The value of Boolean quantity β is then by | Δ |=Vdc-
Vdc-refWith 0.05Vdc-refIt compares and obtains, operating mode is as shown in the table：
3) segmented controls：Divide 5 blocks controls, selects four threshold values, DC bus-bar voltage nominal reference Vdc-refWith
Relationship between four threshold values chosen is as follows：
VL2＜ VL1＜ Vdc-ref＜ VH1＜ VH2 (4)
Wherein, VL2With VH2It is the bound critical voltage value that DC bus-bar voltage allows fluctuation；VL1With VH1Respectively energy storage
Battery discharge and charge threshold level；The system busbar voltage node valve Distribution value that the present invention is arranged has wherein, nominal DC
Bus voltage value between busbar voltage reference value and operated adjacent pattern differs 5%,
(a) block I：VL1＜ Vdc＜ VH1：
As the instantaneous value V of voltage on busbardcMore than VL1, and it is less than VH1When, photovoltaic system uses MPPT maximum power point tracking work
Operation mode is run, and the power that load side is consumed is provided by photovoltaic system；
(b) block II：VH1＜ Vdc＜ VH2：
As the instantaneous value V of voltage on busbardcMore than VH1, and it is less than VH2When, the output power of photovoltaic source is more than needed for load
The power wanted, then the busbar voltage of light storage micro-grid system will rise and be transferred within the scope of the II of region, pair of energy-storage system
It will start to work to DC/DC converters so that energy-storage system is in charged state, more in DC micro power grid system to store
Remaining electric energy, droop control determines the charge power of each energy-storage battery group in energy-storage system, and block II is in this using linear sagging
The voltage regulation capability between balance energy storage battery system is removed in control, as follows：
Wherein, it is specified that energy-storage battery group discharge when Ibi＞ 0, I when chargingbiThe voltage of ＜ 0, reference isI-th of storage
The sagging curve coefficient and bus current of energy battery pack are m respectivelybi、Ibi；
(c) block III：VL2＜ Vdc＜ VL1：
As the instantaneous value V of voltage on busbardcMore than VL2, and less than VL1 when, light storage micro-grid system between will occur it is short
The power of temporary shortage of power, photovoltaic source output cannot be satisfied load side demand, then busbar voltage reduces, and light-preserved system is packed into block
In III, in block III, photovoltaic system external output power in the form of MPPT maximum power point tracking, energy-storage system is with constant pressure at this time
Mode operation, and gone needed for compensation according to power shortage between DC micro power grid system；
(d) block IV：VH2＜ Vdc：
As the instantaneous value V of voltage on busbardcWhen more than VH2, photovoltaic system can first be worked in the form of MPPT maximum power point tracking,
Energy-storage battery is charge mode；Then if the capacity of energy-storage battery has been saturated or energy-storage battery can not be with photovoltaic system
Coordinating to remove to meet DC bus side voltage and drop to allows in section, then photovoltaic system switches to the work of constant voltage mode, protects
Demonstrate,prove the stabilization of DC bus-bar voltage；
(e) block V：Vdc＜ VL2：
As the instantaneous value V of voltage on busbardcWhen less than VL2, light stores up power wretched insufficiency between micro-grid system, both
When cannot be satisfied load side electricity needs, in this state, sub-load fortune is got rid of in the collapse of busbar voltage in order to prevent
Row certainly selects specific removal of load by the importance of DC side actual load with priority.
Maximum allowable critical operation voltage value V is taken in the switching of the photovoltaic source operating modedc-maxWith voltage on busbar
Instantaneous value VdcThe mode to compare, i.e. Vdc-maxWith VdcIt compares, works as Vdc＜ Vdc-maxWhen, the unidirectional DC/DC converters work of PV
In MPPT maximum power point tracking operational mode, direct-current grid is in the state of undisturbed normal operation, and photovoltaic source is external always
Maximum Power Output, energy-storage system maintain busbar voltage to stablize；Work as Vdc＞ Vdc-maxWhen, the unidirectional DC/DC converters of PV are switched to perseverance
Operating mode is pressed, maintains busbar voltage constant by photovoltaic generating system, energy-storage battery charging maintains micro-capacitance sensor internal power balance.
The energy-storage battery discharge mode uses the bicyclic control of discharge of constant pressure, and outer shroud is Voltage loop, and inner ring is electric current loop,
The limitation of electric current bound is added before current regulator.
The beneficial effects of the present invention are：The present invention is based on island mode light store up direct-current grid control method for coordinating,
So that photovoltaic efficiency is higher, while the frequent switching of energy-storage system can be reduced, improve the working life of energy-storage battery,
Power between balance system effectively reduces busbar voltage fluctuation, realizes the reliable and stable operation of independent direct current micro-capacitance sensor, therefore it has
There are important role and meaning.
Description of the drawings
Fig. 1 is the method for the present invention main circuit diagram；
Fig. 2 is the membership function figure of error e of the present invention；
Fig. 3 is the membership function figure of fuzzy controller output quantity of the present invention；
Fig. 4 is photovoltaic system control figure of the present invention；
Fig. 5 is logic selecting module structure chart of the present invention；
Fig. 6 is constant voltage discharge control figure of the present invention；
Fig. 7 is direct-current grid load operation mode figure of the present invention；
Fig. 8 is busbar voltage I-U performance diagrams of the present invention；
Fig. 9 is the droop characteristic figure of energy-storage battery group of the present invention；
Figure 10 a are the photovoltaic power curve graph of isolated island direct-current grid of the present invention work；
Figure 10 b are the energy storage power graph of isolated island direct-current grid of the present invention work；
Figure 10 c are the load power curve graph of isolated island direct-current grid of the present invention work；
Figure 10 d are the load side bus voltage curve graph of isolated island direct-current grid of the present invention work.
Specific implementation mode
A kind of control method for coordinating storing up direct-current grid based on island mode light of the present invention, main circuit such as Fig. 1
It is shown.Photovoltaic source, energy-storage battery, mono-/bis-are wherein contained to DC/DC converters, DC loads, photovoltaic source passes through the unidirectional DC/ of PV
DC converters connect DC bus, and energy-storage battery connects DC bus by the two-way DC/DC converters of Battery, and DC bus is to negative
Carry power supply.
(1) photovoltaic part.Because conventional fuzzy control membership function has a symmetric characteristics, and photovoltaic cell maximum work
Rate point tracks, and the output characteristics on maximum power point both sides does not simultaneously have symmetry feature, if taking the biography of symmetry feature
System fuzzy control, maximum power point both sides output characteristics effect will be biased, is embodied in maximum power point periphery and is in
Existing small-scale oscillation defect proposes and uses asymmetric fuzzy control strategy here so according to photovoltaic cell output characteristic,
Different membership functions and different control strategies are established in maximum power point both sides, to maximum power point into line trace.It is non-
Symmetry ambiguity controller (Asymmetric Fuzzy Logic Controller, AFLC), here mainly to its membership function
Asymmetric blurring is designed.Traditional fuzzy controller usually using error e and error change amount Δ e as the input obscured,
The asymmetric fuzzy logic controller input quantity that the present invention designs is respectively：The variable quantity of the output power from photovoltaic cells P and output
The ratio of the variable quantity of voltage v, the e power errors and Δ e error rates of expression.The expression formula of kth moment input value is such as public
Shown in formula 1, formula 2.
Δ e (k)=e (k)-e (k-1) (2)
Wherein P (k), v (k) are that the output power and voltage at photovoltaic cell current k moment can in very short time respectively
E (k) to be regarded as to the slope of P-U characteristic curves certain point.The output controlled quentity controlled variable of asymmetric fuzzy logic controller is voltage tune
Section amount dv.In the design, select based on trapezoidal and Triangleshape grade of membership function, have asymmetry can more.As shown in Figure 2
The membership function figure of error e, abscissa are the power error values of input quantity e, and ordinate is the language of corresponding fuzzy rule base
Speech letter, membership function design principle is caused by identical voltage change according to photovoltaic cell P-U characteristic curves here
Changed power it is more larger than left side on the right side of maximum power of photovoltaic cell point, in order to preferably promoted MPPT maximum power point tracking essence
Degree to needing to do smaller step-length disturbance on the right side of maximum power point, therefore bears the maximum value of domain inside the output variable selected
Maximum value than positive domain is small.The function of degree of membership after repeatedly adjusting, the person in servitude of fuzzy controller output quantity shown in Fig. 3
Category degree functional arrangement, abscissa are the values of the controlled quentity controlled variable of output.Here IF A AND B THEN C fuzzy rules are used, rule are obscured
Then middle A, B are input control quantity, and C is the value of the controlled quentity controlled variable of output, is obtained shown in fuzzy reasoning table 1, and E misses for e power in table 1
Difference, EC are Δ e error rates.
Table 1
Maximum allowable critical operation voltage value V is taken in the switching of photovoltaic system operating modedc-maxWith voltage on busbar
Instantaneous value VdcThe mode to compare, i.e. Vdc-maxWith VdcIt compares.Work as Vdc＜ Vdc-maxWhen, boost converters are operated in maximum work
Rate point tracking operation mode, direct-current grid are in the state of undisturbed normal operation, and externally output is maximum always for photovoltaic source
Power, and gone that busbar voltage is maintained to stablize by energy-storage system；Work as Vdc＞ Vdc-maxWhen, boost converters are switched to constant pressure Working mould
Formula maintains busbar voltage constant by photovoltaic generating system, and energy-storage battery charging maintains micro-capacitance sensor internal power balance, such as Fig. 4 institutes
Show photovoltaic system control figure.
(2) energy storage section.Two-way DC/DC converters are the important converting means that energy-storage system is connected with system dc busbar
It sets, carries the effect of the function served as bridge and buck/boost of power equalization between micro-grid system.When actual DC bus electricity
When pressure value is less than the critical maximum voltage value of operation, and state-of-charge is in normal range (NR) inside energy-storage battery, then energy storage is electric
Pond group will discharge to micro-grid system, and buck/boost converters are at boost operating modes, export and balance to busbar
Power.At this point, energy-storage system ensures that light storage direct current is micro- by using the size of the control model de-regulation busbar voltage of constant voltage discharge
The power-balance of network system.
When DC bus-bar voltage reaches its maximum operation critical voltage and meets load power requirement, energy storage system need to be carried out
The charge mode of system switches, and power extra in system is flowed to energy-storage module, buck/boost transformation by reversible transducer
Device is operated in buck patterns.The present invention is proposed the logic selecting module constituted using two Boolean quantities α, β and goes to choose herein
The operating mode of energy-storage battery group, it is specific as shown in Figure 5.Here logic selecting module takes the specified busbar voltage reference of direct current
Value Vdc-refWith the instantaneous value V of voltage on busbardcIt compares, i.e. Vdc-refWith VdcIt compares, is as a result denoted as the value of Boolean quantity α, α
=Vdc-Vdc-ref；And the value of Boolean quantity β is then by | Δ |=Vdc-Vdc-refWith 0.05Vdc-refIt compares and obtains.Specific each Working mould
The relationship of formula and Boolean quantity α, β, as shown in table 2.
Table 2
The primary structure of constant voltage discharge control is using outer shroud as Voltage loop, while using inner ring as electric current loop, using voltage, electricity
The two rings are flowed to go to realize control of discharge, constant voltage discharge control figure as shown in Figure 6.Wherein, it is added before current regulator
The limitation of electric current bound, this is in order to which prevent to be likely to occur in discharge process causes the overcurrent of expensive damage to put on battery
The generation of electrical phenomena.
(3) loaded portion.DC load is connected with DC bus, and direct-current grid is according to the weight of DC side actual load
The property wanted certainly selects specific Load Shedding, direct-current grid load operation mode figure as shown in Figure 7 with priority.
(4) segmented control strategy.It, must in micro-grid system for the direct-current grid reliability service for ensureing under island mode
It must be containing one or more loose ends, to ensure the stabilization of voltage on busbar, while between balanced direct-current grid built-in system
Power.Light stores up direct-current grid under island mode, and the instantaneous power balance on DC bus as shown in formula 3, ignores direct current
Power attenuation on micro-capacitance sensor circuit.
Wherein, l, n, m are the quantity of DC load, the quantity of the quantity of energy-storage battery group and photovoltaic panel successively；Ppvi(t)
It is the power that i-th of photovoltaic panel inputs micro-grid system；Pbj(t) it is work(that j-th of energy-storage battery inputs micro-grid system
Rate, while when providing that energy-storage battery group discharges to micro-grid system, the power on input direct-current busbar is taken as positive value；Plk(t) it is
The performance number that k-th of load is consumed.The present invention uses segmented control strategy herein, goes to complete DC micro power grid system
Stabilization safe operation.Segmented control strategy is to pass through preset voltage valve as information carrier according to DC bus-bar voltage
DC bus-bar voltage is divided into five blocks by value node, removes the operating mode between selection light storage DC micro power grid system, as above
Shown in the Fig. 8 of face.Four crucial node threshold values selections and system nominal bus voltage value and stablizing for light storage micro-grid system are transported
Row is closely related, and the selection of adjacent node threshold voltage must be appropriate.DC bus-bar voltage nominal reference V of the present inventiondc-refWith
Relationship between four threshold values chosen, as shown in formula 4.
VL2＜ VL1＜ Vdc-ref＜ VH1＜ VH2 (4)
Wherein, VL2With VH2It is the bound critical voltage value that DC bus-bar voltage allows fluctuation；VL1With VH1Respectively energy storage
Battery discharge and charge threshold level.The system busbar voltage node valve Distribution value that the present invention is arranged is specifically shown in shown in the following table 3,
Wherein, the bus voltage value between nominal DC busbar voltage reference value and operated adjacent pattern differs 5%.
Table 3
(a) block I：VL1＜ Vdc＜ VH1
As the instantaneous value V of voltage on busbardcMore than VL1, and it is less than VH1When, photovoltaic system uses MPPT maximum power point tracking work
Operation mode is run, this process all provides the power that load side is consumed by photovoltaic system.In this mistake in micro-grid system
Cheng Zhong ensures the stabilization of voltage on busbar due to not having energy-storage system as relaxation terminal, so, the I median generatrixes electricity in region
Pressure value can fluctuate in smaller range.In block I, the power-balance between the internal system can be indicated by formula 5.
(b) block II：VH1＜ Vdc＜ VH2
As the instantaneous value V of voltage on busbardcMore than VH1, and it is less than VH2When, it is reduced for load resistance or intensity of illumination is good
In the case of good, the output power of photovoltaic source is more than the required power of load, then the busbar voltage of light storage micro-grid system
It will rise and be transferred within the scope of the II of region, the converter of energy-storage system will start to work so that energy-storage system is in charging shape
State, to store the extra electric energy in DC micro power grid system.Droop control determines filling for each energy-storage battery group in energy-storage system
Electrical power is shown in Fig. 9.Block II uses linear droop control in this, and the voltage between balance energy storage battery system is gone to adjust energy
Power, as shown in formula 6.
Wherein, it is specified that energy-storage battery group discharge when Ibi＞ 0, I when chargingbiThe voltage of ＜ 0, reference isI-th of storage
The sagging curve coefficient and bus current of energy battery pack are m respectivelybi、Ibi.The droop characteristic of block II systems, such as Fig. 8 middle conductors
c-a。
(c) block III：VL2＜ Vdc＜ VL1
As the instantaneous value V of voltage on busbardcMore than VL2, and less than VL1 when, light storage micro-grid system between will occur it is short
The power of temporary shortage of power, photovoltaic source output cannot be satisfied load side demand, then busbar voltage reduces, and light-preserved system is packed into block
In III.In this block, photovoltaic system external output power in the form of MPPT maximum power point tracking, energy-storage system is with perseverance at this time
Die pressing type is run, and is gone needed for compensation according to power shortage between DC micro power grid system.The sagging curve of block III, such as Fig. 8
Shown in middle conductor d-g.Wherein, the droop characteristic of energy-storage battery group electric discharge, as shown in Figure 9.
(d) block IV：VH2＜ Vdc
As the instantaneous value V of voltage on busbardcWhen more than VH2, photovoltaic source system can the first work in the form of MPPT maximum power point tracking
Make, energy-storage battery is charge mode；Then if the capacity of energy-storage battery has been saturated or energy-storage battery can not be with photovoltaic system
Conjunction under unified central planning, which is removed to meet DC bus side voltage and dropped to, to be allowed in section, then photovoltaic source system will switch to constant voltage mode
Work, ensures the stabilization of DC bus-bar voltage.
(e) block V：Vdc＜ VL2
As the instantaneous value V of voltage on busbardcWhen less than VL2, light stores up power wretched insufficiency between micro-grid system, both
When cannot be satisfied load side electricity needs, in this state, the collapse of busbar voltage in order to prevent must just get rid of a part
Unessential load, in order to ensure the safe operation of stabilization and DC micro power grid system in busbar voltage.Ordinary circumstance, foundation
The importance of each load of DC side chooses specific Load Shedding.So the capacity of photovoltaic source and energy-storage battery should choose it is suitable
When to guarantee to meet system safety operation in the most of the time.
The present invention builds simulation model by Matlab/Simulink, and the isolated island light storage direct current for going verification proposed does electricity
The feasibility and validity of net coordination control strategy.Setting uses photovoltaic generation source power 1.8kW, energy-storage battery capacity 4.5kWh
, peak power output about ± 2kW, initial quantity of electricity SOC is 50%, cell safety capacity be strictly limited in 10% and 90% it
Between, specified busbar voltage 380V.Setting starting intensity of illumination is 1400W/m2, load resistance value is 100 Ω.In 0.2s
It carves, intensity of illumination is made to decline 400W/m2；Then, at the 0.3s moment, reduce resistance to 80 Ω, system is made to increase load operation；Most
Afterwards, the 0.4s moment makes intensity of illumination rise 400W/m2
Figure 10 a-10d are photovoltaic power, energy storage power, load power, the load of isolated island direct-current grid of the present invention work
Side bus voltage curve graph, Figure 10 a are photovoltaic sides, in the first stage, the case where 0~0.2s periods do not disturb；Second-order
Section makes intensity of illumination decline 400W/m at the 0.2s moment2；Phase III reduces resistance to 80 Ω, makes at the 0.3s moment
System throws load operation；Fourth stage makes intensity of illumination rise 400W/m at the 0.4s moment2.The photovoltaic work(of this four-stage
Rate curvilinear motion figure.Similarly, Figure 10 b, 10c, 10d are that aforementioned four different phase is corresponding respectively, energy storage side power curve
Figure, load side power graph, lotus side bus voltage curve graph.
Table 4
Table 4 can be seen that the first stage, in 0~0.2s periods, photovoltaic system is controlled using MPPT maximum power point tracking, energy storage
The stabilization of system control bus voltage, power is about 1790W, load power 1450W, energy-storage battery charging to photovoltaic system at this time
Power is about 340W, and busbar voltage is controlled in about 380.5V；Second stage, due at the 0.2s moment, adjusting disturbance so that light
Decline 400W/m according to intensity2, photovoltaic generation power is reduced rapidly at the 0.2s moment to about 1260W, while just for safeguards system
Often the stabilization of operation and busbar voltage, energy-storage system at this time switch to discharge mode about 190W, load by charge mode at once
Power still maintains constant, is 1450W, busbar voltage fluctuation is small, about 379.5V, fast response time；Then, the phase III,
At the 0.3s moment, by reducing resistance mode, load is realized plus thrown, load power increases to about 1790W at the 0.3s moment, and light
Volt power generation does not change substantially, and output power is about 1270W, and energy-storage system continues to keep discharge condition at this time, and carries rapidly
Height meets system power balance and stability to about 520W power, and busbar voltage fluctuation is smaller, about 379V, and response speed is very fast；
Finally in fourth stage, intensity of illumination is set to rise 400W/m by adjusting2, then it is about 1790W that photovoltaic generation power, which rises, and this
When load power be 1790W, so energy storage power is about 0W, not external output power, that is, only photovoltaic system is working,
This stage photovoltaic generation switchs to droop control pattern by MPPT maximum power point tracking pattern, stablizes busbar voltage at this time and is about
379.5V, fluctuation is smaller, and response speed is very fast.
Claims (3)
1. it is a kind of based on island mode light store up direct-current grid control method for coordinating, contain photovoltaic source, energy-storage battery, list/
Two-way DC/DC converters, DC loads, photovoltaic source connect DC bus by the unidirectional DC/DC converters of PV, and energy-storage battery passes through
The two-way DC/DC converters of Battery connect DC bus, DC bus powering load, which is characterized in that coordinate control include with
Under several parts：
1) photovoltaic source：MPPT maximum power point tracking control, asymmetric fuzzy logic control carry out it using asymmetric fuzzy controller
Device input quantity processed is respectively：The ratio and error change of the variable quantity of the output power from photovoltaic cells P and the variable quantity of output voltage v
Rate Δ e, the expression formula at two input value kth moment are as follows：
Δ e (k)=e (k)-e (k-1) (2)
Wherein P (k), v (k) are the output power and voltage at photovoltaic cell current k moment respectively, can be by e in very short time
(k) regard the slope of P-U characteristic curves certain point as；
The output controlled quentity controlled variable of asymmetric fuzzy logic controller is voltage-regulation amount dv；
2) energy-storage battery：The logic selecting module constituted using two Boolean quantities α, β removes the operating mode of choice energy-storage battery group,
Logic selecting module takes the specified busbar voltage reference value V of direct currentdc-refWith the instantaneous value V of voltage on busbardcIt compares, i.e.,
Vdc-refWith VdcIt compares, is as a result denoted as the value of Boolean quantity α, α=Vdc-Vdc-ref；The value of Boolean quantity β is then by | Δ |=Vdc-
Vdc-refWith 0.05Vdc-refIt compares and obtains, operating mode is as shown in the table：
3) segmented controls：Divide 5 blocks controls, selects four threshold values, DC bus-bar voltage nominal reference Vdc-refWith selection
Four threshold values between relationship it is as follows：
VL2＜ VL1＜ Vdc-ref＜ VH1＜ VH2 (4)
Wherein, VL2With VH2It is the bound critical voltage value that DC bus-bar voltage allows fluctuation；VL1With VH1Respectively energy-storage battery
Electric discharge and charge threshold level；The system busbar voltage node valve Distribution value that the present invention is arranged has wherein, nominal DC busbar
Bus voltage value between voltage reference value and operated adjacent pattern differs 5%,
(a) block I：VL1＜ Vdc＜ VH1：
As the instantaneous value V of voltage on busbardcMore than VL1, and it is less than VH1When, photovoltaic system uses MPPT maximum power point tracking Working mould
Formula is run, and the power that load side is consumed is provided by photovoltaic system；
(b) block II：VH1＜ Vdc＜ VH2：
As the instantaneous value V of voltage on busbardcMore than VH1, and it is less than VH2When, the output power of photovoltaic source is required more than load
Power, then the busbar voltage of light storage micro-grid system will rise and be transferred within the scope of the II of region, the two-way DC/ of energy-storage system
DC converters will start to work so that energy-storage system is in charged state, to store the extra electricity in DC micro power grid system
Can, droop control determines that the charge power of each energy-storage battery group, block II use linear droop control in this in energy-storage system,
The voltage regulation capability between balance energy storage battery system is removed, it is as follows：
Wherein, it is specified that energy-storage battery group discharge when Ibi＞ 0, I when chargingbiThe voltage of ＜ 0, reference isI-th of energy-storage battery
The sagging curve coefficient and bus current of group are m respectivelybi、Ibi；
(c) block III：VL2＜ Vdc＜ VL1：
As the instantaneous value V of voltage on busbardcMore than VL2, and less than VL1 when, light storage micro-grid system between of short duration work(will occur
The power of rate shortage, photovoltaic source output cannot be satisfied load side demand, then busbar voltage reduces, and light-preserved system is packed into block III
In, in block III, photovoltaic system external output power in the form of MPPT maximum power point tracking, energy-storage system is with constant pressure mould at this time
Formula is run, and is gone needed for compensation according to power shortage between DC micro power grid system；
(d) block IV：VH2＜ Vdc：
As the instantaneous value V of voltage on busbardcWhen more than VH2, photovoltaic system can first be worked in the form of MPPT maximum power point tracking, energy storage
Battery is charge mode；Then if the capacity of energy-storage battery has been saturated or energy-storage battery can not coordinate with photovoltaic system
Removing to meet DC bus side voltage and dropping to allows in section, then photovoltaic system switches to the work of constant voltage mode, ensures straight
Flow the stabilization of busbar voltage；
(e) block V：Vdc＜ VL2：
As the instantaneous value V of voltage on busbardcWhen less than VL2, light stores up power wretched insufficiency between micro-grid system, both can not
When meeting load side electricity needs, in this state, the collapse of busbar voltage, gets rid of operation at part load in order to prevent, presses
The importance of DC side actual load certainly selects specific removal of load with priority.
2. the control method for coordinating of direct-current grid is stored up based on island mode light according to claim 1, which is characterized in that institute
Maximum allowable critical operation voltage value V is taken in the switching for stating photovoltaic source operating modedc-maxWith the instantaneous value V of voltage on busbardc
The mode to compare, i.e. Vdc-maxWith VdcIt compares, works as Vdc＜ Vdc-maxWhen, the unidirectional DC/DC converters of PV are operated in maximum power
Point tracking operation mode, direct-current grid are in the state of undisturbed normal operation, and photovoltaic source externally exports maximum work always
Rate, energy-storage system maintain busbar voltage to stablize；Work as Vdc＞ Vdc-maxWhen, the unidirectional DC/DC converters of PV are switched to constant pressure Working mould
Formula maintains busbar voltage constant by photovoltaic generating system, and energy-storage battery charging maintains micro-capacitance sensor internal power balance.
3. the control method for coordinating according to claim 1 or claim 2 for being stored up direct-current grid based on island mode light, feature are existed
In the energy-storage battery discharge mode uses the bicyclic control of discharge of constant pressure, and outer shroud is Voltage loop, and inner ring is electric current loop, in electric current
The limitation of electric current bound is added before control ring.
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| CN109286234A (en) * | 2018-10-25 | 2019-01-29 | 枣庄学院 | A kind of charging method based on intelligent photovoltaic power generation array |
| CN109687489A (en) * | 2018-12-05 | 2019-04-26 | 厦门科华恒盛股份有限公司 | The control method, system and terminal device of energy storage device output power in micro-capacitance sensor |
| CN110048396A (en) * | 2019-03-14 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of control system and method for light storage direct-current micro-grid |
| CN110912242A (en) * | 2019-12-09 | 2020-03-24 | 安徽工业大学 | Large-disturbance transient stability coordination control method for DC micro-grid containing hybrid energy storage |
| CN111293717A (en) * | 2020-02-24 | 2020-06-16 | 阳光电源股份有限公司 | Control method and system of optical storage direct current coupling system |
| CN111525546A (en) * | 2020-04-23 | 2020-08-11 | 太原理工大学 | DC micro-grid energy storage unit hierarchical operation control method based on charge state |
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| CN111864797A (en) * | 2020-07-22 | 2020-10-30 | 杭州电子科技大学 | Island microgrid secondary voltage adjusting method based on two-dimensional control |
| CN111900711A (en) * | 2020-07-31 | 2020-11-06 | 宁波市电力设计院有限公司 | Energy coordination control method for off-grid type direct current micro-grid |
| CN112103936A (en) * | 2020-08-27 | 2020-12-18 | 易事特集团股份有限公司 | Island light storage direct current micro-grid mode self-adaption method |
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| CN109286234A (en) * | 2018-10-25 | 2019-01-29 | 枣庄学院 | A kind of charging method based on intelligent photovoltaic power generation array |
| CN109286234B (en) * | 2018-10-25 | 2021-09-21 | 枣庄学院 | Charging method based on intelligent photovoltaic power generation array |
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| CN110048396B (en) * | 2019-03-14 | 2023-11-03 | 中国电力科学研究院有限公司 | Control system and method for optical storage direct current micro-grid |
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| CN111525546B (en) * | 2020-04-23 | 2023-05-23 | 太原理工大学 | Hierarchical operation control method for direct-current micro-grid energy storage unit based on state of charge |
| CN111864795A (en) * | 2020-06-28 | 2020-10-30 | 天津大学 | MPPT trapezoidal voltage disturbance-based direct-current micro-grid island detection method |
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| CN114825419A (en) * | 2021-01-19 | 2022-07-29 | 南京南瑞继保电气有限公司 | Self-adaptive island control system and method for direct current converter station and electronic equipment |
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| CN113258663A (en) * | 2021-05-28 | 2021-08-13 | 中国电子科技集团公司第十八研究所 | Full-regulation power supply system based on MPPT mode |
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| CN113937751B (en) * | 2021-10-19 | 2023-09-26 | 国网山西省电力公司电力科学研究院 | Direct-current micro-grid group power coordination control method and system |
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