CN107171309A - A kind of micro-grid system dc bus voltage stabilizing control method - Google Patents
A kind of micro-grid system dc bus voltage stabilizing control method Download PDFInfo
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004146 energy storage Methods 0.000 claims abstract description 45
- 238000013461 design Methods 0.000 claims abstract description 32
- 230000006870 function Effects 0.000 claims description 67
- 238000007599 discharging Methods 0.000 claims description 10
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
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- 238000002474 experimental method Methods 0.000 claims description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a kind of micro-grid system dc bus voltage stabilizing control method, including：Design feature and working characteristics based on direct-current grid, build the DC micro-electric pessimistic concurrency control under energy-storage system charge mode and discharge mode respectively；According to the DC micro-electric pessimistic concurrency control, the mixed potential function model under charge mode and discharge mode is respectively obtained；Voltage stabilizing analysis is carried out to mixed potential function model, corresponding voltage stabilizing control design case criterion under charge mode and discharge mode is respectively obtained；According to the voltage stabilizing control design case criterion of acquisition, the voltage controller parameter of corresponding converter is set so that micro-grid system voltage regulation operation.The micro-grid system dc bus voltage stabilizing control method ensure that the busbar voltage in DC micro power grid system is in steady operational status all the time, improve the security performance of system operation.
Description
Technical field
The present invention relates to the DC micro power grid system correlative technology field of islet operation, a kind of micro-grid system is particularly related to
Dc bus voltage stabilizing control method.
Background technology
Direct-current grid may be at isolated island and grid-connected two kinds of working conditions, and the direct-current grid being incorporated into the power networks is due to leaning against
Bulk power grid, busbar voltage keeps constant.In the micro-grid system of islet operation, shown in reference picture 1, the simplification provided for the present invention
DC micro power grid system schematic diagram.When generated output is higher than bearing power, busbar voltage rise；When generated output is less than load
During power, busbar voltage reduction.Battery system needs absorb or offer rapid when generated output and electric power are mismatched
Unnecessary power, keeps power-balance, maintains busbar voltage constant.If the DC-DC converter for connecting battery and bus is adjusted
Speed is slower, and when busbar voltage is raised, battery can not charge with absorbed power in time, or when busbar voltage is reduced,
Battery does not discharge to provide power in time, and the problem of can not all solving unbalanced power, busbar voltage can not naturally also be recovered
Rated value.That is, the DC micro power grid system of islet operation, because wind-powered electricity generation, photovoltaic system power are changeable, bearing power change
Than larger, energy-storage system need to ensure that generated output is balanced with electric power, maintain DC bus-bar voltage constant.But current direct current
Micro grid control system is longer due to dynamic responding speed relatively slow, regulating time, it is difficult to so that busbar voltage is maintained at stable shape
State.
So, during the application is realized, inventor has found, prior art at least has following defect：It is current straight
Busbar voltage in stream micro-grid system is difficult to keep stable, can deviate specified with the change of generated output or bearing power
Value.
The content of the invention
In view of this, it is an object of the invention to propose a kind of micro-grid system dc bus voltage stabilizing control method, pass through
The quick response of control energy-storage system ensure that the busbar voltage in DC micro power grid system is in steady operational status all the time,
Improve the security performance of system operation.
A kind of micro-grid system dc bus voltage stabilizing control method provided based on the above-mentioned purpose present invention, including：
Design feature and stabilizing voltage characteristic based on direct-current grid, build energy-storage system charge mode and electric discharge mould respectively
DC micro-electric pessimistic concurrency control under formula, namely the simplified model by being obtained after equivalent conversion；
According to the DC micro-electric pessimistic concurrency control, the mixed potential function model under charge mode and discharge mode is respectively obtained；
Voltage stabilizing analysis is carried out to mixed potential function model, corresponding voltage stabilizing control under charge mode and discharge mode is respectively obtained
Design criteria processed；
According to the voltage stabilizing control design case criterion of acquisition, the corresponding outer shroud voltage controller parameter of energy-storage system is set so that
Micro-grid system constant-pressure stable is run.
Optionally, the corresponding DC micro power grid system of the DC micro-electric pessimistic concurrency control includes convertor controls unit；It is described
Convertor controls unit control outer shroud be Voltage loop, for control bus voltage；In the control of the convertor controls unit
Ring is electric current loop, the charging and discharging currents for controlling energy-storage system；The convertor controls unit is exported by voltage controller
Given value of current value is so as to adjust the size of the charging and discharging currents of energy-storage system.
Optionally, the convertor controls unit is compared actually measured busbar voltage with default normal voltage
Compared with if busbar voltage is more than normal voltage, control energy-storage system is charged；If busbar voltage is less than normal voltage, control
Energy-storage system processed is discharged.
Optionally, the energy-storage system processed is provided with charging and discharging currents secure threshold；Judge the convertor controls unit
Whether the control electric current provided is more than the electric current secure threshold, if so, then controlling energy-storage system using electric current secure threshold as electricity
Flow size and carry out discharge and recharge, otherwise, the control electric current size that control energy-storage system is provided according to convertor controls unit is filled
Electric discharge.
Optionally, mixed potential function model of the DC micro power grid system under charge mode is：
Wherein, P (i, v) is mixed potential function, PGFor micro battery generated output, v is bus capacitor both end voltage, P0It is negative
Carry power, RBFor energy-storage system equivalent resistance；
Mixed potential function model of the DC micro power grid system under discharge mode be：
Optionally, it is described according to the DC micro-electric pessimistic concurrency control, respectively obtain the mixing under charge mode and discharge mode
The step of Potential Function Models, also includes：
Corresponding electric current potential function and voltage potential function are obtained by mixed potential function model inference；
By the design feature of mixed potential function model and micro-grid system, electric current and the corresponding checking letter of voltage are obtained
Number；
Verify whether the corresponding model parameter of the DC micro-electric pessimistic concurrency control is accurate by the checking function.
Optionally, under charge mode, the electric current potential function and voltage potential function are respectively：
A (i)=0；
It is corresponding to verify that function is：
Wherein, C is bus capacitor, PGFor micro battery generated output, iBFor batteries to store energy
The bidirectional DC-DC converter input current of system.
Under discharge mode, the electric current potential function and voltage potential function are respectively：
A (i)=0；
It is corresponding to verify that function is：
Optionally, it is described that voltage stabilizing analysis is carried out to mixed potential function model, respectively obtain under charge mode and discharge mode
The step of corresponding voltage stabilizing control design case criterion, also includes：
According to mixed potential function model, the two group characteristic functions related to micro-grid system stability are obtained；
Solution obtains the corresponding two groups of minimal eigenvalues of characteristic function；
Based on the constant control requirement of busbar voltage, it is necessary to meet voltage stabilizing condition so that two groups of minimal eigenvalue sums are big
In zero；
Bring two groups of minimal eigenvalues into voltage stabilizing condition, obtain voltage stabilizing control design case criterion；
By parameter transformation iteration, the condition that the scale parameter of outer shroud voltage controller needs to meet is obtained.
Optionally, the two group characteristic functions related to micro-grid system stability are respectively：
L-1/2Aii(i)L-1/2；
C-1/2Bvv(v)C-1/2；Wherein, Aii、BvvRespectively current potential function pair electric current i second order local derviation and voltage potential function
To voltage v second order local derviation；
Under charge mode, the corresponding two groups of minimal eigenvalues of characteristic function are respectively：
μ1=0；
Under discharge mode, the corresponding two groups of minimal eigenvalues of characteristic function are respectively：
μ1=0；
The voltage stabilizing condition is：
μ1+μ2＞ 0；
Under charge mode, voltage stabilizing control design case criterion is：
The scale parameter of voltage controller needs the condition met to be：
Under discharge mode, voltage stabilizing control design case criterion is：
The scale parameter of voltage controller needs the condition met to be：
Optionally, methods described also includes：
Direct-current grid energy-storage system control algolithm is built, and sets at least two groups parameters to carry out simulated experiment；
By parameter setting and results contrast, verify whether the micro-grid system dc bus voltage stabilizing control method is accurate
Really.
From the above it can be seen that the micro-grid system dc bus voltage stabilizing control method that the present invention is provided is by building
DC micro-electric pessimistic concurrency control and corresponding mixed potential function model, are derived by stability of a system condition, and then turn by formula
Change and simplify, obtain the voltage stabilizing condition that the scale parameter of voltage controller needs to meet.So, can be by setting corresponding ginseng
Number, as long as so that the scale parameter of voltage controller meets voltage stabilizing condition, then can ensure that micro-grid system is in bus all the time
The running status of voltage stabilization.Therefore, herein described micro-grid system dc bus voltage stabilizing control method ensure that direct current
Busbar voltage in micro-grid system is in steady operational status all the time, improves the security performance of system operation.
Brief description of the drawings
The simplification DC micro power grid system schematic diagram that Fig. 1 provides for the present invention；
The flow signal of the one embodiment for the micro-grid system dc bus voltage stabilizing control method that Fig. 2 provides for the present invention
Figure；
The convertor controls strategy principle schematic that Fig. 3 provides for the present invention；
DC micro power grid system model structure schematic diagram under the charge mode that Fig. 4 provides for the present invention；
DC micro power grid system model structure schematic diagram under the discharge mode that Fig. 5 provides for the present invention；
The DC micro-electric network control system for the simplification that Fig. 6 provides for the present invention；
Fig. 7 sets A groups parameter voltage change oscillogram in load changing for the system that the present invention is provided；
Fig. 8 sets A groups parameter changed power oscillogram in load changing for the system that the present invention is provided；
Fig. 9 sets A groups parameter curent change oscillogram in load changing for the system that the present invention is provided；
Figure 10 sets B groups parameter voltage change oscillogram in load changing for the system that the present invention is provided；
Figure 11 sets B groups parameter changed power oscillogram in load changing for the system that the present invention is provided；
Figure 12 sets B groups parameter curent change oscillogram in load changing for the system that the present invention is provided.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The entity of individual same names non-equal or the parameter of non-equal, it is seen that " first " " second " should not only for the convenience of statement
The restriction to the embodiment of the present invention is interpreted as, subsequent embodiment no longer illustrates one by one to this.
It is directed to the problem of current busbar voltage is unstable, the application is from the bidirectional DC-DC converter control being connected with battery
Controlling angle set out solution direct-current grid unbalanced power the problem of, ensure busbar voltage it is constant.
Shown in reference picture 2, one embodiment of the micro-grid system dc bus voltage stabilizing control method provided for the present invention
Schematic flow sheet.The micro-grid system dc bus voltage stabilizing control method includes：
Step 101, design feature based on direct-current grid and dc bus stabilizing voltage characteristic, build energy-storage system respectively
DC micro-electric pessimistic concurrency control under charge mode and discharge mode；Wherein, in order to which the energy-storage system adapted in micro-grid system is deposited
In two kinds of mode of operations of charge and discharge, different micro-capacitance sensor models can be set up respectively, enabling energy-storage system is carried out corresponding
Functional localization.Stabilizing voltage characteristic described here refers to consider that the corresponding structure progress of system is equivalent based on busbar voltage voltage stabilizing
Or simplify.
Step 102, according to the DC micro-electric pessimistic concurrency control, the mixing gesture letter under charge mode and discharge mode is respectively obtained
Exponential model；The corresponding mixed potential function model of system is obtained, Current Voltage in system and power-related parameter can be obtained
Relation, is conducive to follow-up voltage stabilizing to analyze.
Step 103, deriving analysis is carried out to mixed potential function model, respectively obtains correspondence under charge mode and discharge mode
Voltage stabilizing control design case criterion；The voltage stabilizing criterion refers to design by certain parameter, even if micro- source, bearing power occur to dash forward
Become, based on system quick regulation characteristic, it is also possible that busbar voltage keeps stable operation.
Step 104, according to the voltage stabilizing control design case criterion of acquisition, the outer loop voltag control of corresponding DC-DC converter is set
Device parameter so that micro-grid system busbar voltage keeps stable operation.
From above-described embodiment, herein described micro-grid system dc bus voltage stabilizing control method is by building direct current
Micro-capacitance sensor models and corresponding mixed potential function model, are derived by stability of a system condition, so by formula conversion and
Simplify, obtain the voltage stabilizing condition that the scale parameter of outer shroud voltage controller needs to meet.So, can be by setting corresponding ginseng
Number, as long as so that the scale parameter of voltage controller meets voltage stabilizing condition, then micro-grid system busbar voltage can be ensured all the time
In steady operational status.Therefore, herein described micro-grid system dc bus voltage stabilizing control method ensure that direct current is micro-
Busbar voltage in network system is in steady operational status all the time, improves the security performance of system operation.
Shown in reference picture 3, the convertor controls strategy principle schematic provided for the present invention.The DC micro-electric pessimistic concurrency control
Corresponding DC micro power grid system includes convertor controls unit；The convertor controls unit control outer shroud be Voltage loop,
For control bus voltage；The convertor controls unit control inner ring be electric current loop, the charge and discharge for controlling energy-storage system
Electric current；The convertor controls unit adjusts the charging and discharging currents of energy-storage system by voltage controller output current set-point
Size.
In the application some optional embodiments, the convertor controls unit by actually measured busbar voltage with it is pre-
If normal voltage be compared, if busbar voltage is more than normal voltage, control energy-storage system is charged, and reduction bus is electric
Pressure；If busbar voltage is less than normal voltage, control energy-storage system is discharged, to compensate raising busbar voltage.
In the application some optional embodiments, the energy-storage system processed is provided with charging and discharging currents secure threshold；Sentence
Whether the control electric current that the convertor controls unit that breaks is provided is more than the electric current secure threshold, if so, then control energy storage system
System carries out discharge and recharge by size of current of electric current secure threshold, otherwise, and control energy-storage system is provided according to convertor controls unit
Control electric current carry out discharge and recharge.By setting electric current secure threshold, the safe operation of energy-storage system ensure that.
That is, it needs to be determined that the control strategy of bidirectional DC-DC converter before system control is carried out：Busbar voltage is real
Actual value and default rated value, i.e. standard value, are compared, and when voltage actual value is more than rated value, show that generated output is big
In electric power, battery-operated, with absorbed power, reduces busbar voltage in charged state；When actual value is less than rated value,
Illustrate that generated output is less than electric power, battery-operated provides power in discharge condition, to compensate raising busbar voltage.It is based on
Analyze above, convertor controls outer shroud needs to be Voltage loop.In addition, also needing to control the size of accumulator cell charging and discharging electric current, therefore
It is electric current loop to control inner ring.The a reference value of accumulator cell charging and discharging electric current is provided by outer voltage.
In the application some optional embodiments, the micro-grid system dc bus voltage stabilizing control method includes：
Two mode of operations of charge and discharge are had based on energy-storage system or battery, two kinds of situations need to respectively be modeled.
First, direct-current grid simplified model of the energy-storage system under charge mode is set up.During islet operation, energy-storage system
Pressure stabilization function, therefore the micro battery current source Equivalent Modeling of bus bar side are played to dc bus；Load due to by closed-loop control,
The characteristic of constant power load can be presented, i.e., negative resistance character can be presented in voltage change, Ideal Nonlinear model can be used：Po=
Constant=VoIoTo represent；Battery and bidirectional DC-DC converter can be considered overall and account for that busbar voltage is higher, electric power storage
Pond charging current is bigger, and common impedance operator can be presented, with impedance RBModeling.
The equivalent-circuit model of micro-capacitance sensor is as shown in Figure 4 under charge mode.The model structure according to Fig. 4, can be filled
The mixed potential function model of system is under power mode：
It is available based on formula (1)：
A (i)=0 (2)
Wherein, A (i) is electric current potential function, and B (v) is voltage potential function.
According to model parameter formula (1) and system shown in Figure 4 structure, it can obtain：
The model parameter that formula (4) indicates micro-capacitance sensor under formula (1) charge mode is correct.
The characteristic of controlled current source is integrally presented with bidirectional DC-DC converter for battery under discharge mode, can use controlled electricity
Stream source is modeled.Micro- source is identical with charge mode with load modeling mode, and micro-grid system is equivalent under energy storage discharge mode
Circuit model is as shown in Figure 5.
The model structure according to Fig. 5, the mixed potential function model that can obtain system under discharge mode is：
It is available based on formula (5)：
A (i)=0 (6)
Wherein, A (i) is electric current potential function, and B (v) is voltage potential function.
According to model parameter formula (5) and system shown in Figure 5 structure, it can obtain：
The model parameter that formula (8) indicates micro-capacitance sensor under formula (5) discharge mode is correct.
Mixed potential function model based on DC micro power grid system under charge and discharge mode, carries out voltage stabilizing analysis, energy respectively
Enough draw voltage stabilizing control design case criterion.Specifically,
Charge mode performance evaluation is carried out first, can be obtained based on formula (1) model parameter：
μ1=0 (9)
Wherein, μ1It is characteristic function L-1/2Aii(i)L-1/2Minimal eigenvalue, μ2It is characteristic function C-1/2Bvv(v)C-1/2's
Minimal eigenvalue, for stable DC busbar voltage, above-mentioned two minimal eigenvalue needs to meet condition：
μ1+μ2＞ 0 (11)
Bring formula (9) and formula (10) into formula (11), can obtain：
Wherein, iBFor DC-DC converter input current ,-R is the negative impedance of constant power load.
According to Fig. 3, when DC bus-bar voltage is more than rated value, energy-storage system is operated under charge mode, now outer shroud
The current value of the PI links output of voltage controller should be met
Wherein, ibrefIt is the set-point of charging current, VrefIt is bus rated value, VdcBusbar voltage.
In the case where not considering power attenuation, the input current i of DC-DC converterBWith output current ib, i.e. battery
Charging current, meets：
iBV=ibvb (14)
Therefore, obtain
ib=KiB (15)
Wherein, parameter K is met：
Bring formula (13) into formula (15), and formula (15) both members can be obtained to voltage v derivations：
Voltage controller scale parameter k i.e. under charge modepMeet：
Formula (18) provides voltage stabilizing control design case criterion for the design of the voltage controller of charge mode.
Then discharge mode performance evaluation is carried out, can be obtained based on formula (5) model parameter：
μ1=0 (19)
Wherein, μ1It is characteristic function L-1/2Aii(i)L-1/2Minimal eigenvalue, μ2It is characteristic function C-1/2Bvv(v)C-1/2's
Minimal eigenvalue, in order to stablize busbar voltage, needs to meet：
μ1+μ2＞ 0 (21)
Wushu (19) and formula (20) bring formula (21) into, can obtain：
Wherein, iBFor DC-DC converter output current ,-R is the negative impedance of constant power load.
When DC bus-bar voltage is less than rated value, energy-storage system is operated under discharge mode, now outer loop voltag control
The current value of the PI links output of device should be met
Do not consider the power attenuation of switch converters equally, can obtain：
Wherein, parameter K meets formula (16).Understood based on formula (24), voltage controller scale parameter k under discharge modepIt is full
Foot：
Formula (25) provides voltage stabilizing control design case foundation for the design of voltage controller under discharge mode.
So, designed based on voltage stabilizing, directly obtained the restrictive condition of related scale parameter in voltage controller.
It is that voltage stabilizing control design case shown in verification expression (18) and formula (25) is accurate in the application other optional embodiments
Then, the DC micro-electric network control system of simplification as shown in Figure 6 has been built.Busbar voltage needs energy-storage system to carry out voltage stabilizing control,
Busbar voltage rated value is 380V, and micro battery is replaced with current source, and generated output is 3000W；Load the Buck by closed-loop control
Converter and resistance are constituted, and its power can be from 800W steps to 6500W；The batteries terminal voltage of energy-storage system is 100V, is stored
Battery charge and discharge current secure threshold are 40A.
Based on formula (18), it is known that the proportionality coefficient k of the voltage controller of energy-storage system chargingpIt should meet：
Based on formula (25), it is known that the proportionality coefficient k of discharge voltage controllerpIt should meet：
To be compared, two groups of parameters of A, B as shown in table 1 are devised.Wherein, A groups parameter meets charging, electric discharge two surely
Control design case criterion is pressed, B groups parameter only meets charge controller voltage stabilizing control design case criterion, be unsatisfactory for the voltage stabilizing control design case that discharges
Criterion.A group parameter operation results are as shown in Fig. 7, Fig. 8, Fig. 9, and B group parameter operation results are as shown in Figure 10, Figure 11, Figure 12.
The systematic parameter of table 1
| Parameter | A | B |
| Busbar voltage | 380V | 380V |
| Generated output | 3kW | 3kW |
| Bearing power changes | 0.8kW~6.5kW | 0.8kW~6.5kW |
| Charge controller kp | 0.5 | 0.5 |
| Voltage stabilizing criterion:kp>0.08 | Meet | Meet |
| Discharge controller kp | 0.4 | 0.2 |
| Voltage stabilizing criterion:kp>0.325 | Meet | It is unsatisfactory for |
Result shown in comparison diagram 7-12, it is female when meeting voltage stabilizing control design case criterion shown in formula (18) and formula (25) simultaneously
Line voltage can keep constant in bearing power acute variation, when the formula that is unsatisfactory for (18) and formula (25), and busbar voltage is in load
Occur during power large disturbances and significantly fall, cause system crash can not normal work.As a result it will be appreciated that described herein
Micro-grid system dc bus voltage stabilizing control method is actually active control strategy.
Those of ordinary skills in the art should understand that：The discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under the thinking of the present invention, above example
Or can also not be combined between the technical characteristic in be the same as Example, step can be realized with random order, and be existed such as
Many other changes of upper described different aspect of the invention, for simplicity, they are provided not in details.
In addition, to simplify explanation and discussing, and in order to obscure the invention, can in the accompanying drawing provided
To show or can not show that the known power ground with integrated circuit (IC) chip and other parts is connected.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this have also contemplated that following facts, i.e., on this
The details of the embodiment of a little block diagram arrangements be depend highly on the platform that will implement the present invention (that is, these details should
It is completely in the range of the understanding of those skilled in the art).Elaborating detail (for example, circuit) with describe the present invention
In the case of exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case of or implement the present invention in the case that these details are changed.Therefore, these descriptions are considered as explanation
It is property rather than restricted.
Although having been incorporated with specific embodiment of the invention, invention has been described, according to retouching above
State, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, other memory architectures (for example, dynamic ram (DRAM)) can use discussed embodiment.
Embodiments of the invention be intended to fall within the broad range of appended claims it is all it is such replace,
Modifications and variations.Therefore, within the spirit and principles of the invention, any omission, modification, equivalent substitution, the improvement made
Deng should be included in the scope of the protection.
Claims (10)
1. a kind of micro-grid system dc bus voltage stabilizing control method, it is characterised in that including：
Design feature and stabilizing voltage characteristic based on direct-current grid, build under energy-storage system charge mode and discharge mode respectively
DC micro-electric pessimistic concurrency control；
According to the DC micro-electric pessimistic concurrency control, the mixed potential function model under charge mode and discharge mode is respectively obtained；
Voltage stabilizing analysis is carried out to mixed potential function model, corresponding voltage stabilizing control under charge mode and discharge mode is respectively obtained and sets
Count criterion；
According to the voltage stabilizing control design case criterion of acquisition, the corresponding outer shroud voltage controller parameter of energy-storage system is set so that micro- electricity
Net system constant-pressure stable is run.
2. according to the method described in claim 1, it is characterised in that the corresponding direct-current grid system of the DC micro-electric pessimistic concurrency control
System includes convertor controls unit；The convertor controls unit control outer shroud be Voltage loop, for control bus voltage；Institute
That states convertor controls unit controls inner ring to be electric current loop, the charging and discharging currents for controlling energy-storage system；The converter control
Unit processed is by voltage controller output current set-point so as to adjust the size of the charging and discharging currents of energy-storage system.
3. method according to claim 2, it is characterised in that the convertor controls unit is electric by actually measured bus
Pressure is compared with default normal voltage, if busbar voltage is more than normal voltage, control energy-storage system is charged；If female
Line voltage is less than normal voltage, then controls energy-storage system to be discharged.
4. method according to claim 2, it is characterised in that the energy-storage system processed is provided with charging and discharging currents safety threshold
Value；Judge whether the control electric current that the convertor controls unit is provided is more than the electric current secure threshold, if so, then control storage
Energy system carries out discharge and recharge by size of current of electric current secure threshold, otherwise, and control energy-storage system is according to convertor controls unit
The control electric current size provided carries out discharge and recharge.
5. according to the method described in claim 1, it is characterised in that mixing of the DC micro power grid system under charge mode
Potential Function Models are：
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<mi>P</mi>
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<mo>=</mo>
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<mi>P</mi>
<mi>G</mi>
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<mo>-</mo>
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<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
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</msub>
<mi>v</mi>
</mfrac>
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<mo>-</mo>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msub>
<mi>R</mi>
<mi>B</mi>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>v</mi>
<msub>
<mi>R</mi>
<mi>B</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mi>v</mi>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<mfrac>
<mi>v</mi>
<msub>
<mi>R</mi>
<mi>B</mi>
</msub>
</mfrac>
<mo>-</mo>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mfrac>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
<msub>
<mi>R</mi>
<mi>B</mi>
</msub>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, P (i, v) is mixed potential function, PGFor micro battery generated output, v is bus capacitor both end voltage, P0For load work(
Rate, RBEnergy-storage system equivalent resistance；
Mixed potential function model of the DC micro power grid system under discharge mode be：
<mrow>
<mi>P</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mi>v</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>-</mo>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>-</mo>
<mi>v</mi>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mo>+</mo>
<mfrac>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>.</mo>
</mrow>
6. according to the method described in claim 1, it is characterised in that described according to the DC micro-electric pessimistic concurrency control, respectively obtain
The step of mixed potential function model under charge mode and discharge mode, also includes：
Corresponding electric current potential function and voltage potential function are obtained by mixed potential function model inference；
By the design feature of mixed potential function model and micro-grid system, electric current and the corresponding checking function of voltage are obtained；
Verify whether the corresponding model parameter of the DC micro-electric pessimistic concurrency control is accurate by the checking function.
7. method according to claim 6, it is characterised in that under charge mode, the electric current potential function and voltage potential letter
Number is respectively：
A (i)=0；
<mrow>
<mi>B</mi>
<mrow>
<mo>(</mo>
<mi>v</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mfrac>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
<msub>
<mi>R</mi>
<mi>B</mi>
</msub>
</mfrac>
<mo>;</mo>
</mrow>
It is corresponding to verify that function is：
Wherein, C is bus capacitor, and P is the energy function of system, PGFor micro battery generated output,
iBFor the bidirectional DC-DC converter input current of energy-storage system；
Under discharge mode, the electric current potential function and voltage potential function are respectively：
A (i)=0；
<mrow>
<mi>B</mi>
<mrow>
<mo>(</mo>
<mi>v</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>-</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>+</mo>
<munderover>
<mo>&Integral;</mo>
<mn>0</mn>
<mi>v</mi>
</munderover>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mi>d</mi>
<mi>v</mi>
<mo>;</mo>
</mrow>
It is corresponding to verify that function is：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>L</mi>
<mfrac>
<mrow>
<mi>d</mi>
<mi>i</mi>
</mrow>
<mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mn>0</mn>
<mo>=</mo>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>P</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>i</mi>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>C</mi>
<mfrac>
<mrow>
<mi>d</mi>
<mi>v</mi>
</mrow>
<mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<msub>
<mi>P</mi>
<mi>G</mi>
</msub>
<mi>v</mi>
</mfrac>
<mo>+</mo>
<mfrac>
<msub>
<mi>P</mi>
<mi>B</mi>
</msub>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mi>v</mi>
</mfrac>
<mo>=</mo>
<mo>-</mo>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>P</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>v</mi>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>.</mo>
</mrow>
8. according to the method described in claim 1, it is characterised in that described that voltage stabilizing analysis is carried out to mixed potential function model, divide
The step of not obtaining corresponding voltage stabilizing control design case criterion under charge mode and discharge mode also includes：
According to mixed potential function model, the two group characteristic functions related to micro-grid system stability are obtained；
Solution obtains the corresponding two groups of minimal eigenvalues of characteristic function；
Based on the constant control requirement of busbar voltage, it is necessary to meet voltage stabilizing condition so that two groups of minimal eigenvalue sums are more than zero；
Bring two groups of minimal eigenvalues into voltage stabilizing condition, obtain voltage stabilizing control design case criterion；
By parameter transformation iteration, the condition that the scale parameter of voltage controller needs to meet is obtained.
9. according to the method described in claim 1, it is characterised in that the two group features related to micro-grid system stability
Function is respectively：
L-1/2Aii(i)L-1/2；
C-1/2Bvv(v)C-1/2；
Under charge mode, the corresponding two groups of minimal eigenvalues of characteristic function are respectively：
μ1=0；
<mrow>
<msub>
<mi>&mu;</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mi>C</mi>
</mfrac>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
</mfrac>
<mo>-</mo>
<mfrac>
<mrow>
<msub>
<mi>di</mi>
<mi>B</mi>
</msub>
</mrow>
<mrow>
<mi>d</mi>
<mi>v</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>;</mo>
</mrow>
Under discharge mode, the corresponding two groups of minimal eigenvalues of characteristic function are respectively：
μ1=0；
<mrow>
<msub>
<mi>&mu;</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mi>C</mi>
</mfrac>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<msub>
<mi>di</mi>
<mi>B</mi>
</msub>
</mrow>
<mrow>
<mi>d</mi>
<mi>v</mi>
</mrow>
</mfrac>
<mo>+</mo>
<mfrac>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
The voltage stabilizing condition is：
μ1+μ2＞ 0；
Under charge mode, voltage stabilizing control design case criterion is：
<mrow>
<mfrac>
<mrow>
<msub>
<mi>di</mi>
<mi>B</mi>
</msub>
</mrow>
<mrow>
<mi>d</mi>
<mi>v</mi>
</mrow>
</mfrac>
<mo>></mo>
<mfrac>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mrow>
<mo>-</mo>
<mi>R</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
The scale parameter of voltage controller needs the condition met to be：
<mrow>
<msub>
<mi>k</mi>
<mi>p</mi>
</msub>
<mo>></mo>
<mfrac>
<mrow>
<mo>-</mo>
<mi>K</mi>
</mrow>
<mrow>
<mo>-</mo>
<mi>R</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
2
Under discharge mode, voltage stabilizing control design case criterion is：
<mrow>
<mo>-</mo>
<mfrac>
<mrow>
<msub>
<mi>di</mi>
<mi>B</mi>
</msub>
</mrow>
<mrow>
<mi>d</mi>
<mi>v</mi>
</mrow>
</mfrac>
<mo>></mo>
<mfrac>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mrow>
<mo>-</mo>
<mi>R</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
The scale parameter of voltage controller needs the condition met to be：
<mrow>
<msub>
<mi>k</mi>
<mi>p</mi>
</msub>
<mo>></mo>
<mfrac>
<mrow>
<mo>-</mo>
<mi>K</mi>
</mrow>
<mrow>
<mo>-</mo>
<mi>R</mi>
</mrow>
</mfrac>
<mo>.</mo>
</mrow>
10. according to the method described in claim 1, it is characterised in that also include：
Direct-current grid energy-storage system control algolithm is built, and sets at least two groups parameters to carry out simulated experiment；
By parameter setting and results contrast, verify whether the micro-grid system dc bus voltage stabilizing control method is accurate.
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| CN112003322A (en) * | 2020-08-12 | 2020-11-27 | 北方工业大学 | Method for designing control parameters of grid-connected converter of micro-grid system |
| CN112909915A (en) * | 2019-12-04 | 2021-06-04 | 中车株洲电力机车研究所有限公司 | Stability analysis method and system for direct-current voltage control system |
| CN116505536A (en) * | 2023-06-30 | 2023-07-28 | 深圳优普莱等离子体技术有限公司 | Pressure stabilizing system and method for microwave source of MPCVD equipment |
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Effective date of registration: 20200901 Address after: 3-508, 5 / F, No.1, Shanyuan street, Haidian District, Beijing 100084 Co-patentee after: Wu Zhaobin Patentee after: Beijing Huisi Huineng Technology Co.,Ltd. Co-patentee after: Wang Aike Co-patentee after: Tian Liting Co-patentee after: Ge Xianjun Co-patentee after: Tian Hao Co-patentee after: Tian Wenhui Address before: 100144 Beijing City, Shijingshan District Jin Yuan Zhuang Road No. 5, North China University of Technology Patentee before: North China University of Technology |
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Effective date of registration: 20230609 Address after: Room 602, 6th Floor, Building 5, East Half, No. 2 Zhenxing Road, Science and Technology Park, Changping District, Beijing, 100000 Patentee after: Beijing Huisi Huineng Technology Co.,Ltd. Address before: 100084 3-508, 5th floor, No.1 Shanyuan street, Haidian District, Beijing Patentee before: Beijing Huisi Huineng Technology Co.,Ltd. Patentee before: Wu Zhaobin Patentee before: Wang Aike Patentee before: Tian Liting Patentee before: Ge Xianjun Patentee before: Tian Hao Patentee before: Tian Wenhui |