CN106849164B - A kind of isolated island micro-capacitance sensor unifies SOC balance control method - Google Patents
A kind of isolated island micro-capacitance sensor unifies SOC balance control 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
A kind of isolated island micro-capacitance sensor of the present invention unifies SoC balance control method, state-of-charge SOC by obtaining each distributed energy storage unit corrects information, information is corrected using state-of-charge SOC in the case where being based on low bandwidth distributed communication, adjust the sagging coefficient of each distributed energy storage unit, by adjusting the sagging coefficient of each distributed energy storage unit, to adjust the angular frequency reference value of each distributed energy storage unit, so that each distributed energy storage unit charge-discharge electric power is all in optimum state, the final balance divided equally with the state-of-charge SOC of each distributed energy storage unit for realizing bearing power, to reach a control strategy while be suitable for the control of SOC balance and SOC balance control under discharge condition under charged state, so that filling, the control strategy of discharge mode is unitized, overcome charge and discharge The unstable defect of system caused by Cheng Jinhang control strategy converts.
Description
Technical field
The present invention relates to micro-capacitance sensors, electrical energy storage systems technical field, are distributed more particularly, to one kind based on low bandwidth
Formula communication isolated island micro-capacitance sensor unifies SOC balance control method.
Background technique
Micro-capacitance sensor includes various forms of distributed generation resources, energy storage device, load, energy conversion device, monitoring and protection
Device, being one can be realized self-contr ol, protection and the autonomous system of management, have isolated island and grid-connected two kinds of operational modes.
On the one hand, micro-capacitance sensor can be considered as small-sized electric system, due to itself having good energy management functionality, Ke Yiyou
Effect ground maintains optimization distribution and balance of the energy in micro-capacitance sensor, guarantees the economy of micro-capacitance sensor operation；On the other hand, micro-capacitance sensor
" virtual " power supply or the load that can be considered as in distribution system again can coordinate control to distributed power source output power in netting
System can also play power grid the effect of load peak load shifting, can also realize micro-capacitance sensor with the energy in bidirectional flow between bulk power grid,
The it is proposed of micro-capacitance sensor is the reliability for improving power system power supply, effective use renewable energy, reduces environmental pollution and electric energy
Loss and solution powerup issue from far-off regions etc. provide new effective way.
Isolated island micro-capacitance sensor refers to that micro-capacitance sensor is detached from bulk power grid independent operating.Isolated island micro-capacitance sensor isolated island micro-capacitance sensor due to departing from
Bulk power grid, so its own must assure that output voltage in the case where no bulk power grid carries out frequency and voltage support to it
It is met the requirements with frequency, while also to realize that bearing power is divided equally, use sagging control under normal circumstances.
It is contemplated that the intermittence and uncertainty of most of renewable energy, it is necessary to be equipped with energy-storage system to inhibit micro-
Source output-power fluctuation.Since micro- source position distribution in micro-capacitance sensor is usually more dispersed, need to usually be configured to micro- source distributed
Energy-storage system DESS (distributed energy storage system:DESS).Distributed energy storage system is by being connected in series
Battery unit and interface converter composition.Generally for improve DESS in battery distributed energy-storage units safety and prolong
Its long service life, it is necessary to assure it is individually a certain to realize that SOC balance is also avoided that for SOC (state of charge:SOC) balance
The transition of a energy-storage module uses.Therefore most important in the SOC balance for realizing DESS in isolated island micro-capacitance sensor.
Realize that the control program of SOC balance can be divided into two classes: battery management system BMS (battery management
) and power converter system PCS (power converter systemPCS) system:BMS.SOC balance is realized by BMS
Method mainly have in it can read up the literature: dynamic restructuring is carried out by battery to each energy-storage module to balance averagely charged shape
State, this method influence DESS performance less to also avoid potential unsafe condition simultaneously；Another method is with one kind
New circuit realizes that the Fast-Balance between battery unit, this new circuit can reduce the number of switching device.However
The state-of-charge for being all based on each battery unit that BMS comes in balancing battery string of both methods, in micro-capacitance sensor this
Two methods are not suitable for balancing the SOC of DESS.
SOC balance method based on PCS mainly has in it can read up the literature: the sagging control in direct-current grid based on SOC
Method with exchange SOC balance control method in micro-capacitance sensor, the droop control method based on SOC mainly has two in direct-current grid
Kind: the first is to realize that SOC is balanced by allowing active sagging coefficient to be inversely proportional variation with SOCn, but this method only exists
DESS is under discharge mode and is just able to achieve；Second is that method can be realized under discharge mode and charge mode, still
When charge mode and discharge mode switch, two kinds of control strategies is needed to switch therewith.SOC balance based on exchange micro-capacitance sensor
There are mainly two types of control methods: the first SOC balance method sagging based on P-f, but system meeting in the case where SOC very little
Become unstable；Second is the SOC balance that more DESS are realized by using a kind of cascade pwm converter, but this
Method needs centralized communication, and when centralized communication network breaks down, this control method will fail.
In conclusion seeking a kind of the shortcomings that capable of overcoming above-mentioned various methods and can be under charge mode and discharge mode all
The SOC balance method that can be acted on is necessary.
Summary of the invention
The present invention provides a kind of isolated island micro-capacitance sensor based on low bandwidth distributed communication and unifies SOC balance control method, with
The unstable and complicated control strategy technology of the distributed energy storage system SOC balance control in existing isolated island micro-capacitance sensor is solved to ask
Topic.
According to an aspect of the present invention, a kind of isolated island micro-capacitance sensor is provided and unifies SOC balance control method, including following step
It is rapid:
S1. according to the state-of-charge SOC of each distributed energy storage unit, the charged shape of each distributed energy storage unit is obtained
State SOC corrects information；
S2. active power of output, output reactive power and state-of-charge SOC correction based on each distributed energy storage unit
Information obtains the output reference voltage amplitude and angular frequency reference value of each distributed energy storage unit；
S3. output reference voltage amplitude and angular frequency reference value based on each distributed energy storage unit pass through voltage electricity
It flows two close cycles to adjust, to realize that bearing power is divided equally and all distributed energy storage system state-of-charge SOC are balanced.
On the basis of above scheme preferably, the step S1 the following steps are included:
S11. the state-of-charge SOC of each distributed energy storage unit is obtained；
S12. by the state-of-charge SOC of each distributed energy storage unit respectively with distributed energy storage unit adjacent thereto
State-of-charge SOC compare, with obtain each distributed energy storage unit state-of-charge SOC correct information.
On the basis of above scheme preferably, the state-of-charge SOC that the step S12 obtains each distributed energy storage unit is rectified
The expression formula of positive information are as follows:
Wherein, SOCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, Ω is indicated and the
I distributed energy storage unit closes on the set of distributed energy storage unit, SOCiIndicate the charged shape of i-th of distributed energy storage unit
State SOC, SOCjFor the state-of-charge SOC, k of j-th of distributed energy storage unitpIndicate the coefficient of distributed director；aijIt indicates
Data are transferred to the communication weight coefficient of i-th of distributed energy storage unit from j-th of distributed energy storage unit, set adjacent point
There are communication link wiring then a between cloth energy-storage unitsij=1, j >=i >=1.
On the basis of above scheme preferably, the SOCiAcquisition expression formula are as follows:
Wherein, SOC0iIndicate the state-of-charge SOC initial value of i-th of distributed energy storage unit, CeiIndicate i-th of distribution
The capacity of formula energy-storage units, iiniIndicate that the output electric current of i-th of distributed energy storage unit, dt indicate the differential to time constant.
On the basis of above scheme preferably, the step S2 obtain the angular frequency reference value of each distributed energy storage unit into
One step includes；
S21. information is corrected according to the state-of-charge SOC of each distributed energy storage unit and corresponds to distributed energy storage unit
Active power of output, sagging coefficient after the adjustment to obtain each distributed energy storage unit；
S22. the output of sagging coefficient and corresponding distributed energy storage unit after the adjustment based on each distributed energy storage unit
Active power, to obtain the actual output frequency of each distributed energy storage unit based on the sag of chain of unloaded output frequency；
S23. actual output frequency based on each distributed energy storage unit is based on the sag of chain of unloaded output frequency and right
The angular frequency in distributed energy storage unit zero load situation is answered, to obtain the angular frequency reference value of each distributed energy storage unit.
On the basis of above scheme preferably, the step S21 obtains sagging system after the adjustment of each distributed energy storage unit
Several expression formulas are as follows:
Δ m=mi-sgn(Pi)SoCcorrect_i；
Wherein, sagging coefficient after the adjustment of i-th of distributed energy storage unit of Δ m expression, miIndicate i-th of distributed energy storage
The sagging coefficient of active-frequency droop curve of unit, PiIndicate the active power of output of i-th of distributed energy storage unit,
SoCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is sign function, i >=1.
On the basis of above scheme preferably, the step S22 obtains the actual output frequency of each distributed energy storage unit
The expression formula of sag of chain based on unloaded output frequency are as follows:
Pi'=Δ m*Pi=[mi-sgn(Pi)SoCcorrect_i]Pi；
Wherein, Pi' indicate the actual output frequency of i-th of distributed energy storage unit based on the sagging of unloaded output frequency
Amount, sagging coefficient after the adjustment of Δ m i-th of distributed energy storage unit of expression, miIndicate having for i-th of distributed energy storage unit
The sagging coefficient of function-frequency, PiIndicate the active power of output of i-th of distributed energy storage unit, SoCcorrect_iIt indicates i-th
The state-of-charge SOC of distributed energy storage unit corrects information, sgn (Pi) it is sign function, i >=1.
On the basis of above scheme preferably, the step S23 obtains the angular frequency reference value of each distributed energy storage unit
Expression formula are as follows:
ωi=ω*-Δm*Pi=ω*-[mi-sgn(Pi)SoCcorrect_i]Pi；
Wherein, ωiIndicate the angular frequency reference value of i-th of distributed energy storage unit, ω*Indicate lower i-th point of no-load condition
The angular frequency of cloth energy-storage units, sagging coefficient after the adjustment of Δ m i-th of distributed energy storage unit of expression, miIndicate i-th point
The sagging coefficient of active-frequency droop curve of cloth energy-storage units, PiIndicate that the output of i-th of distributed energy storage unit is active
Power, SoCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is sign function,
i≥1。
On the basis of above scheme preferably, when i-th of distributed energy storage unit is in charged state, sgn (Pi)=- 1；
When i-th of distributed energy storage unit is in discharge condition, sgn (Pi)=1.
On the basis of above scheme preferably, the step S2 obtains the output reference voltage width of each distributed energy storage unit
The expression formula of value are as follows:
Vi=V*-niQi；
Wherein, ViIndicate the output reference voltage amplitude of i-th of distributed energy storage unit, QiIndicate i-th of distributed energy storage
The reactive power of unit output, V*Indicate the output voltage amplitude of i-th of distributed energy storage unit under no-load condition, niIndicate without
The sagging coefficient of the sagging controlling curve of function-voltage.
A kind of isolated island micro-capacitance sensor of the present invention unifies SOC balance control method, by the charged shape for obtaining each energy-storage units
State SOC corrects information, corrects information using state-of-charge SOC, the sagging coefficient of each energy-storage units is adjusted, by adjusting each
The sagging coefficient of energy-storage units, to adjust the output angle frequency reference of each energy-storage units, so that each energy-storage units charge and discharge
Electrical power is all in optimum state, to realize the state-of-charge SOC of bearing power divided equally with each distributed energy storage unit
Balance, to reach a control strategy while be suitable under charged state SOC balance control under the control of SOC balance and discharge condition
System, keep its control strategy simpler, overcome charge and discharge process carry out control strategy convert caused by system it is unstable lack
It falls into, while using distributed communication, so that system still is able to realize SOC balance and bear in the case where section communication line fault
Carry power-sharing.
Detailed description of the invention
Fig. 1 is the isolated island microgrid topology structure schematic diagram that the present invention uses low bandwidth distributed communication；
Fig. 2 is that a kind of isolated island micro-capacitance sensor based on low bandwidth distributed communication of the present invention unifies SOC balance control method
System entirety control block diagram；
Fig. 3 is that a kind of isolated island micro-capacitance sensor based on low bandwidth distributed communication of the present invention unifies SOC balance control method
The control output characteristics of active-frequency droop controlling curve；
Fig. 4 is that a kind of isolated island micro-capacitance sensor based on low bandwidth distributed communication of the present invention unifies SOC balance control method
Control flow chart；
Fig. 5 is micro-grid system simulation model structural schematic diagram constructed in the specific embodiment of the invention；
Fig. 6 a is output work of the method proposed by the invention at each distributed energy storage unit of micro-capacitance sensor in discharge mode
Rate simulation waveform；
Fig. 6 b is charged shape of the method proposed by the invention at each distributed energy storage unit of micro-capacitance sensor in discharge mode
State SOC simulation waveform；
Fig. 6 c is output work of the method proposed by the invention at each distributed energy storage unit of micro-capacitance sensor in charging mode
Rate simulation waveform；
Fig. 6 d is charged shape of the method proposed by the invention at each distributed energy storage unit of micro-capacitance sensor in charging mode
State SOC simulation waveform；
Fig. 6 e is imitative for output power of the method proposed by the invention at each DESS of micro-capacitance sensor in charge and discharge pattern switching
True waveform diagram；
Fig. 6 f is state-of-charge of the method proposed by the invention at each DESS of micro-capacitance sensor in charge and discharge pattern switching
SOC simulation waveform；
Fig. 7 a is output work of the method proposed by the invention in distributed communication network section communication line fault
Rate simulation waveform；
Fig. 7 b is charged shape of the method proposed by the invention in distributed communication network section communication line fault
State SOC simulation waveform.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
The present invention provides a kind of isolated island micro-capacitance sensors based on low bandwidth distributed communication to unify SOC balance control method,
Isolated island micro-capacitance sensor of the invention unifies SOC balance control method for ease of description, below by of the invention based on low bandwidth
The structure of the isolated island micro-capacitance sensor of distributed communication is introduced.
Refering to Figure 1, simultaneously as shown in connection with fig. 2, the present invention is based on the isolated island micro-capacitance sensor packets of low bandwidth distributed communication
It includes several distributed micro- sources, several distributed distributed energy storage units, bus and is connected to public negative on bus
It carries, it is parallel with one another between several distributed micro- sources, and several rear micro- sources in parallel are passed through into transmission line and bus phase
Even；It is parallel with one another between several distributed distributed energy storage units, and be connected by bus with micro- source after parallel connection.
Wherein, each distributed energy storage unit includes energy storage ontology, energy storage inverter, SOC state estimator and local control
Device processed, energy storage ontology are connected by energy storage inverter with bus, and SOC state estimator passes through local controller and energy storage inversion
Device is connected, to control the switch state of energy storage inverter.Local controller includes droop control device, and SOC state estimator is logical
Droop control device is crossed to control energy storage inverter.
And the mutual distributed communication of SOC state estimator of each distributed energy storage unit of the invention is connected, i.e., it is each
The SOC state estimator of distributed energy storage unit carries out information exchange by distributed communication.Each distributed energy storage unit
SOC state estimator is connected with local controller, to control distributed energy storage unit.
Each distributed energy storage unit is connected with a sagging adjuster, and sagging adjuster passes through SOC state estimator
It is electrical connected with distributed energy storage unit, and each distributed energy storage unit is connected on bus by respective feeder line, and
Each SOC state estimator is connected with each other by distributed communication network.
In the course of work, SOC state estimator obtains the SOC correction information of each distributed energy storage unit, and by the SOC
Correction information is sent to sagging adjuster, and sagging adjuster corrects information according to the SOC of each distributed energy storage unit come to each
The sagging coefficient of a distributed energy storage unit is adjusted, to realize the SOC balance and load of each distributed energy storage unit
Power-sharing.
Below by based on above-mentioned isolated island micro-capacitance sensor, it is described in detail isolated island micro-capacitance sensor of the invention and unifies SOC balance
Control method, please continue to refer to shown in Fig. 3.
A kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method, comprising the following steps:
S1. the SOC state estimator in each distributed energy storage unit obtains the charged shape of each distributed energy storage unit
State SOC, the state-of-charge SOC for each distributed energy storage unit that will acquire and the distribution adjacent with the distributed energy storage unit
The state-of-charge SOC of formula energy-storage units is compared, to obtain the state-of-charge SOC correction letter of each distributed energy storage unit
Breath；
Meanwhile according to the output electric current and output voltage of each distributed energy storage unit, to obtain each distributed energy storage
The active power of output and output reactive power of unit；
S2. then, sagging adjuster according to the active power of output of each distributed energy storage unit, output reactive power and
State-of-charge SOC corrects information, obtains the output reference voltage amplitude and angular frequency reference value of each distributed energy storage unit；
S3. output reference voltage amplitude and angular frequency reference value based on each distributed energy storage unit pass through voltage electricity
It flows two close cycles to adjust, to realize the balance of the state-of-charge SOC of each distributed energy storage unit and dividing equally for bearing power.
A kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method, by utilizing each distributed energy storage unit
Interior SOC state estimator acquisition obtains the state-of-charge SOC value of each distributed energy storage unit, then, by each distribution
The state-of-charge SOC value of energy-storage units is compared with the state-of-charge SOC value of adjacent distributions formula energy-storage units, each to obtain
The state-of-charge SOC of distributed energy storage unit corrects information, information is corrected using the SOC of each distributed energy storage unit, to adjust
The sagging coefficient of each sagging adjuster is saved, to change the charge or discharge power of each distributed energy storage unit, to realize
The balance of the state-of-charge SOC of each distributed energy storage unit.
The present invention uses a kind of control strategy, can be suitable for distributed energy storage unit simultaneously in charged state or discharge condition
The balance of lower SOC controls, and keeps its control strategy simpler, and when the switching of charge and discharge state, without changing strategy, makes orphan
Island micro-grid system is more reliable and more stable, overcomes traditional control method and needs the defect that switches, and the present invention is using having
Function-frequency droop curve, voltage magnitude-angular frequency sagging curve is controlled, therefore achieves that common load is divided equally.
In another embodiment of the invention, step S1 of the invention the following steps are included:
S11. the state-of-charge SOC of each distributed energy storage unit is obtained；
S12. by the state-of-charge SOC of each distributed energy storage unit lotus with distributed energy storage unit adjacent thereto respectively
Electricity condition SOC compares, and corrects information to obtain the state-of-charge SOC of each distributed energy storage unit.
It is preferred that state-of-charge correction information of the present invention is calculated using distributed average homogeneity agreement, therefore, upper
State the expression formula that step S12 obtains the state-of-charge SOC correction information of each distributed energy storage unit are as follows:
Wherein, SOCcorrect_iIndicate the state-of-charge SoC correction information of i-th of distributed energy storage unit, Ω indicates i-th
A distributed energy storage unit closes on the set of distributed energy storage unit, SOCiIndicate the charged shape of i-th of distributed energy storage unit
State SoC, SOCjFor the state-of-charge SoC, k of j-th of distributed energy storage unitpIndicate the coefficient of distributed director；aijIt indicates
Data are transferred to the communication weight coefficient of i-th of distributed energy storage unit from j-th of distributed energy storage unit, set adjacent point
There are communication link wiring then a between cloth energy-storage unitsij=1, j >=i >=1.
In another embodiment of the invention, the state-of-charge SoC of i-th of distributed energy storage unit of the invention ---
SOCiAcquisition expression formula are as follows:
Wherein, SOC0iIndicate the state-of-charge SOC initial value of i-th of distributed energy storage unit, CeiIndicate i-th of distribution
The capacity of formula energy-storage units, iiniIndicate that the output electric current of i-th of distributed energy storage unit, dt indicate the differential to time constant.
Further, it is contemplated that the time scale of the output translator Voltage loop of distributed energy storage unit compares state-of-charge
The time scale of SOC is much smaller, therefore, the output voltage values of each distributed energy storage unit be can be considered into an equal constant:
vin1≈vin2≈…vinn≈Vin(2)；
Wherein, VinnIndicate the output voltage of i-th of distributed energy storage unit；i≥1.
Ignore the power loss of the output translator of distributed energy storage unit, then i-th of distributed energy storage unit output becomes
The output power of parallel operation are as follows:
Pi≈pini=viniiini(3)；
Wherein, PiIndicate the output power of the output translator of i-th of distributed energy storage unit, PiniIndicate i-th of distribution
The output power of formula energy-storage units, VinnIndicate the output voltage of i-th of distributed energy storage unit；i≥1.
According to the deformation of formula (2) and formula (3) available formula (1) are as follows:
Wherein, SOCiIndicate the state-of-charge SOC, SOC of i-th of distributed energy storage unit0iIndicate i-th of distributed energy storage
The state-of-charge SOC initial value of unit, CeiIndicate the capacity of i-th of distributed energy storage unit, iiniIndicate i-th of distributed storage
The output electric current of energy unit, dt indicate the differential to time constant.
In another embodiment of the invention, step S2 obtains the angular frequency reference value of each distributed energy storage unit into one
Step includes；
S21. the SOC state estimator of each distributed energy storage unit is by the state-of-charge SOC of the distributed energy storage unit
Correction information is sent to sagging adjuster, and sagging adjuster is according to the state-of-charge of each distributed energy storage unit received
Control is adjusted in the active power of output of SOC correction information and corresponding distributed energy storage unit, to obtain each distributed storage
Sagging coefficient after the adjustment of energy unit；
S22. the sagging adjuster of base is according to sagging coefficient after the adjustment of each distributed energy storage unit and corresponding distributed storage
The active power of output of energy unit, to obtain the actual output frequency of each distributed energy storage unit based on unloaded output frequency
Sag of chain；
S23. finally, sagging adjuster is defeated by the reality of each distributed energy storage unit of tune of each distributed energy storage unit
Sag of chain of the frequency based on unloaded output frequency and angular frequency in distributed energy storage unit zero load situation is answered it out, passes through angle
Frequency control equations, to obtain the output angle frequency reference of each distributed energy storage unit.
Wherein, step S21 obtains the expression formula of sagging coefficient after the adjustment of each distributed energy storage unit are as follows:
Δ m=mi-sgn(Pi)SoCcorrect_i(5)；
Wherein, sagging coefficient after the adjustment of i-th of distributed energy storage unit of Δ m expression, miIndicate i-th of distributed energy storage
The sagging coefficient of active-frequency droop curve of unit, PiIndicate the active power of output of i-th of distributed energy storage unit,
SoCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is sign function, i >=1.
Further, it is based in the actual output frequency that above-mentioned steps S22 obtains each distributed energy storage unit unloaded defeated
The expression formula of the sag of chain of frequency out are as follows:
Pi'=Δ m*Pi=[mi-sgn(Pi)SoCcorrect_i]Pi(6)；
Wherein, Pi' indicate the actual output frequency of i-th of distributed energy storage unit based on the sagging of unloaded output frequency
Amount, sagging coefficient after the adjustment of Δ m i-th of distributed energy storage unit of expression, miIndicate having for i-th of distributed energy storage unit
The sagging coefficient of function-frequency droop curve, PiIndicate the active power of output of i-th of distributed energy storage unit, SoCcorrect_iTable
Show the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is sign function, i >=1.
In another embodiment of the invention, step S23 of the invention obtains the angular frequency of each distributed energy storage unit
The expression formula of reference value are as follows:
ωi=ω*-Δm*Pi=ω*-[mi-sgn(Pi)SoCcorrect_i]Pi(7)；
Wherein, ωiIndicate the angular frequency reference value of i-th of distributed energy storage unit, ω*Indicate lower i-th point of no-load condition
The output angular frequency of cloth energy-storage units, sagging coefficient after the adjustment of Δ m i-th of distributed energy storage unit of expression, miIndicate i-th
The sagging coefficient of active-frequency droop curve of a distributed energy storage unit, PiIndicate the output of i-th of distributed energy storage unit
Active power, SoCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is symbol
Function, i >=1.
In another preferred embodiment of the invention, step S2 of the invention obtains the output of each distributed energy storage unit
The expression formula of reference voltage amplitude, i.e. voltage magnitude governing equation are as follows:
Vi=V*-niQi(8)；
Wherein, ViIndicate the output reference voltage amplitude of i-th of distributed energy storage unit, QiIndicate i-th of distributed energy storage
The reactive power of unit output, V*Indicate the output voltage amplitude of i-th of distributed energy storage unit under no-load condition, niIndicate without
The sagging coefficient of the sagging controlling curve of function-voltage.
It should be noted that when i-th of distributed energy storage unit is in discharge condition, sgn (Pi)=1, if at this point, originally
Invent the state-of-charge SOC correction information SOC of i-th of distributed energy storage unitcorrect_iWhen also greater than 0, then corresponding i-th
Sagging coefficient delta m will reduce after the adjustment of distributed energy storage unit, according to Fig.4, the output characteristics of sagging adjuster of the invention
Curve will be it is known that i-th of distributed energy storage unit will export more active-power Psi, and according to formula (4) it is known that
The state-of-charge SOC of i-th of distributed energy storage unit in discharge modeiReduced speed becomes faster, to realize i-th of distribution
The state-of-charge SOC Fast-Balance of formula energy-storage units；Similarly, when i-th of distributed energy storage unit is in discharge condition, sgn
(Pi)=1, and the state-of-charge SOC of i-th of distributed energy storage unit of the present invention corrects information SOCcorrect_iIt is when less than 0, then right
Sagging coefficient delta m will increase after the adjustment for i-th of the distributed energy storage unit answered, according to Fig.4, sagging adjuster of the invention
Output characteristic curve it is known that i-th of distributed energy storage unit will export less active-power Pi, and according to formula
(4) it is known that the state-of-charge SOC of i-th of distributed energy storage unit in discharge modeiWhat is reduced slows, thus
Realize the state-of-charge SOC Fast-Balance of i-th of distributed energy storage unit.
When i-th of distributed energy storage unit is in charged state, sgn (Pi)=- 1, if at this point, i-th point of the present invention
The state-of-charge SOC of cloth energy-storage units corrects information SOCcorrect_iWhen also greater than 0, then corresponding i-th of distributed energy storage list
Sagging coefficient delta m will increase after the adjustment of member, and the output characteristic curve of sagging adjuster of the invention can obtain according to Fig.4,
Know, i-th of distributed energy storage unit will absorb less active-power Pi, and according to formula (4) it is known that in charge mode
The state-of-charge SOC of lower i-th of distributed energy storage unitiIt is increased to slow, to realize each distributed energy storage unit
State-of-charge SOC Fast-Balance；Similarly, when i-th of energy-storage units is in charged state, sgn (Pi)=1, and the present invention i-th
The state-of-charge SOC of a distributed energy storage unit corrects information SOCcorrect_iWhen less than 0, then corresponding i-th of distributed energy storage
Sagging coefficient delta m will reduce after the adjustment of unit, and the output characteristic curve of sagging adjuster of the invention can obtain according to Fig.4,
Know, i-th of distributed energy storage unit will absorb more active-power Psi, and according to formula (4) it is known that in charge mode
The state-of-charge SOC of lower i-th of distributed energy storage unitiIncreased speed becomes faster, to realize i-th of distributed energy storage unit
State-of-charge SOC Fast-Balance.
After sagging coefficient delta m is determined after the adjustment of each distributed energy storage unit, sagging adjuster executes angular frequency control
Equation and voltage magnitude governing equation processed, i.e. formula (7) and formula (8).
When distributed energy storage unit is under discharge condition, the output of the big distributed energy storage unit of active power of output is electric
Pressure refers to angular frequencyiIt can reduce, the volume output voltage of the small distributed energy storage unit of active power of output refers to angular frequencyi
It can increase；When distributed energy storage unit is under charged state, the big distribution of the active power that distributed energy storage unit absorbs
The output voltage of energy-storage units refers to angular frequencyiIt can increase, absorb the volume output of the small distributed energy storage unit of active power
Voltage Reference angular frequencyiIt can reduce；When the state-of-charge SOC of all distributed energy storage units reaches balance, i.e.,
SOCcorrect_iWhen=0, the frequency control equations and voltage magnitude governing equation of sagging adjuster are respectively as follows:
As traditional sagging control.The output voltage reference value of sagging adjuster final output, then pass through voltage and current
Double-closed-loop control is adjusted, voltage value needed for finally making each distributed energy storage unit output, to realize load function
Rate is divided equally and the state-of-charge SOC of each distributed energy storage unit is balanced.
In order to further verify the technical effect of technical solution of the present invention, Fig. 5 of the invention constructs four distributed storages
Energy unit carries out experiment simulation, is illustrated in figure 5 embodiment micro-grid system simulation model, is provided with four distributions in model
Energy-storage units.
By Fig. 6 a and Fig. 6 b it is found that when each distributed energy storage unit is in discharge condition and their SOC original state not
Meanwhile using method proposed by the invention, each distributed energy storage unit can finally realize that SOC balance and bearing power are equal
Point.
By Fig. 6 c and Fig. 6 d it is found that when each distributed energy storage unit is in charged state and their SOC original state not
Meanwhile using method proposed by the invention, each distributed energy storage unit can finally realize that SOC balance and bearing power are equal
Point.
By Fig. 6 e and Fig. 6 f it is found that when each distributed energy storage unit by discharge mode be switched to charge mode and they
When SOC original state difference, using method proposed by the invention, dynamic response is fast, and each distributed energy storage unit is finally all
It is able to achieve SOC balance and bearing power is divided equally.Therefore the isolated island micro-capacitance sensor based on low bandwidth distributed communication proposed is unified
SOC balance method both can be suitably used for charge mode or can be suitably used for discharge mode, and in distributed energy storage unit in charging, electric discharge
When pattern switching, system is not necessarily to switching control strategy, and rapid dynamic response speed.
By Fig. 7 a and Fig. 7 b it is found that using method proposed by the invention, when each distributed energy storage unit is in electric discharge shape
State, their SOC original state is different and the first distributed energy storage cells D ESS1 and the second distributed energy storage cells D ESS2 it
Between communication line failure when, each distributed energy storage unit be finally all still able to achieve SOC balance and bearing power divides equally, each distribution
The SOC deviation of energy-storage units is within the acceptable range.It can be seen that the isolated island based on low bandwidth distributed communication proposed is micro-
Even if power grid unifies SOC balance control method is still able to achieve SOC balance and load function in the case where section communication line fault
Rate is divided equally.
A kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method, has following advantages:
1, a kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method in all distributed energy storage units of realization
SOC is also able to achieve bearing power while balance and divides equally.
2, a kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method either when distributed energy storage unit is in
When charged state or distributed energy storage unit are in discharge condition, it can realize that SOC balance and bearing power are divided equally, and
Excellent dynamic property is also shown in charging, discharge mode switching, forms and is uniformly controlled plan under charge and discharge mode
Slightly, the shortcomings that some traditional control methods need switching control strategy is overcome.
3, a kind of isolated island micro-capacitance sensor of the invention unifies SOC balance control method using distributed communication, each
Distributed energy storage system need to only acquire the SOC information of the distributed energy storage system adjacent with it.It avoids using central controller, base
In local communication, communication line is short out, at low cost, improves system reliability, scalability, flexibility, has point-to-point function, i.e.,
Make distributed network failure, system remains to the operation of robust.
Finally, the present processes are only preferable embodiment, it is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (7)
1. a kind of isolated island micro-capacitance sensor unifies SOC balance control method, which comprises the following steps:
S1. according to the state-of-charge SOC of each distributed energy storage unit, the state-of-charge of each distributed energy storage unit is obtained
SOC corrects information；
S2. active power of output, output reactive power and state-of-charge SOC correction letter based on each distributed energy storage unit
Breath, obtains the output reference voltage amplitude and angular frequency reference value of each distributed energy storage unit；
S3. output reference voltage amplitude and angular frequency reference value based on each distributed energy storage unit, it is double by voltage and current
Closed loop is adjusted, to realize that bearing power is divided equally and the state-of-charge SOC of each distributed energy storage unit is balanced；
Step S1 the following steps are included:
S11. the state-of-charge SOC of each distributed energy storage unit is obtained；
S12. by the state-of-charge SOC of each distributed energy storage unit lotus with distributed energy storage unit adjacent thereto respectively
Electricity condition SOC compares, and corrects information to obtain the state-of-charge SOC of each distributed energy storage unit；
The expression formula of the state-of-charge SOC correction information of each distributed energy storage unit is obtained in step S12 are as follows:
Wherein, SOCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, Ω indicates i-th point
The set of the adjacent distributed energy storage unit of cloth energy-storage units, SOCiIndicate the state-of-charge of i-th of distributed energy storage unit
SOC,SOCjFor the state-of-charge SOC, k of j-th of distributed energy storage unitpiIndicate the coefficient of i-th of distributed director；aijTable
Registration is set adjacent according to the communication weight coefficient for being transferred to i-th of distributed energy storage unit from j-th of distributed energy storage unit
There are communication link wiring then a between distributed energy storage unitijI >=1=1, j >；
Wherein, the expression formula of the angular frequency reference value of each distributed energy storage unit is obtained are as follows:
ωi=ω*-Δm*Pi=ω*-[mi-sgn(Pi)SOCcorrect_i]Pi；
Wherein, SOCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, ωiIndicate i-th point
The angular frequency reference value of cloth energy-storage units, ω*Indicate the angular frequency of i-th of distributed energy storage unit under no-load condition, Δ m table
Show sagging coefficient after the adjustment of i-th of distributed energy storage unit, miUnder the active-frequency for indicating i-th of distributed energy storage unit
Catenary sagging coefficient, PiIndicate the active power of output of i-th of distributed energy storage unit, sgn (Pi) be sign function, i >=
1。
2. a kind of isolated island micro-capacitance sensor as described in claim 1 unifies SOC balance control method, which is characterized in that the SOCi's
Obtain expression formula are as follows:
Wherein, SOC0iIndicate the state-of-charge SOC initial value of i-th of distributed energy storage unit, CeiIndicate i-th of distributed storage
The capacity of energy unit, iiniIndicate that the output electric current of i-th of distributed energy storage unit, dt indicate the differential to time constant.
3. a kind of isolated island micro-capacitance sensor as described in claim 1 unifies SOC balance control method, which is characterized in that in step S2
The angular frequency reference value for obtaining each distributed energy storage unit further comprises；
S21. the output of information and corresponding distributed energy storage unit is corrected according to the state-of-charge SOC of each distributed energy storage unit
Active power, sagging coefficient after the adjustment to obtain each distributed energy storage unit；
S22. the output of sagging coefficient and corresponding distributed energy storage unit is active after the adjustment based on each distributed energy storage unit
Power, to obtain the actual output frequency of each distributed energy storage unit based on the sag of chain of unloaded output frequency；
S23. the actual output frequency based on each distributed energy storage unit is based on the sag of chain of unloaded output frequency and corresponding point
Angular frequency under cloth energy-storage units no-load condition, to obtain the angular frequency reference value of each distributed energy storage unit.
4. a kind of isolated island micro-capacitance sensor as claimed in claim 3 unifies SOC balance control method, which is characterized in that in step S21
Obtain the expression formula of sagging coefficient after the adjustment of each distributed energy storage unit are as follows:
Δ m=mi-sgn(Pi)SOCcorrect_i；
Wherein, sagging coefficient after the adjustment of i-th of distributed energy storage unit of Δ m expression, miIndicate i-th of distributed energy storage unit
Active-frequency droop curve sagging coefficient, PiIndicate the active power of output of i-th of distributed energy storage unit,
SOCcorrect_iIndicate the state-of-charge SOC correction information of i-th of distributed energy storage unit, sgn (Pi) it is sign function, i >=1.
5. a kind of isolated island micro-capacitance sensor as claimed in claim 3 unifies SOC balance control method, which is characterized in that in step S22
The actual output frequency of each distributed energy storage unit is obtained based on the expression formula of the sag of chain of unloaded output frequency are as follows:
Pi'=Δ m*Pi=[mi-sgn(Pi)SOCcorrect_i]Pi；
Wherein, Pi' indicate the actual output frequency of i-th of distributed energy storage unit based on the sag of chain of unloaded output frequency, Δ m
Indicate sagging coefficient after the adjustment of i-th of distributed energy storage unit, miIndicate the active-frequency of i-th of distributed energy storage unit
The sagging coefficient of sagging curve, PiIndicate the active power of output of i-th of distributed energy storage unit, SOCcorrect_iIt indicates i-th
The state-of-charge SOC of distributed energy storage unit corrects information, sgn (Pi) it is sign function, i >=1.
6. as a kind of described in any item isolated island micro-capacitance sensors of claim 4-5 unify SOC balance control method, which is characterized in that
When i-th of distributed energy storage unit is in charged state, sgn (Pi)=- 1；
When i-th of distributed energy storage unit is in discharge condition, sgn (Pi)=1.
7. a kind of isolated island micro-capacitance sensor as described in claim 1 unifies SOC balance control method, which is characterized in that in step S2
Obtain the expression formula of the output reference voltage amplitude of each distributed energy storage unit are as follows:
Vi=V*-niQi；
Wherein, ViIndicate the output reference voltage amplitude of i-th of distributed energy storage unit, QiIndicate i-th of distributed energy storage unit
The reactive power of output, V*Indicate the output voltage amplitude of i-th of distributed energy storage unit under no-load condition, niIndicate idle-electricity
Depress the sagging coefficient for the controlling curve that hangs down.
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| CN108365621B (en) * | 2018-03-15 | 2020-07-07 | 阳光电源股份有限公司 | Energy management method, device and system based on energy storage inverter |
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| CN109067003B (en) * | 2018-08-14 | 2020-08-07 | 中南大学 | SOC balance control system for cascade energy storage system |
| CN109546668A (en) * | 2018-11-22 | 2019-03-29 | 国网四川省电力公司电力科学研究院 | One kind is provided multiple forms of energy to complement each other energy storage state balance control method and system in system |
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| CN111224416B (en) * | 2020-02-19 | 2023-12-29 | 燕山大学 | Cascaded energy storage converter parallel control method and system based on SOC balance |
| CN111725825A (en) * | 2020-06-28 | 2020-09-29 | 江苏科技大学 | Hybrid energy storage coordination control method based on droop control |
| CN112104024A (en) * | 2020-09-04 | 2020-12-18 | 易事特集团股份有限公司 | Self-adaptive droop control method and system for energy storage converter |
| CN112531756A (en) * | 2020-11-30 | 2021-03-19 | 香港中文大学（深圳） | Distributed control method, system and equipment for electric quantity balance of energy storage system |
| CN113126546A (en) * | 2021-04-19 | 2021-07-16 | 中国电力科学研究院有限公司 | Distributed energy storage system frequency support controller and control method |
| CN113517722B (en) * | 2021-05-14 | 2024-04-12 | 阳光电源股份有限公司 | Voltage output control method and device and electronic equipment |
| CN113991719B (en) * | 2021-12-03 | 2023-11-24 | 华北电力大学 | Energy consumption optimization scheduling method and system for island group participated in by electric ship |
| CN114884165B (en) * | 2022-05-11 | 2023-09-05 | 杭州华塑科技股份有限公司 | Flow equalizing method and device for energy storage equipment |
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