CN105119301B - A kind of micro-capacitance sensor theoretical based on equivalent feeder line is idle to divide equally control method - Google Patents
A kind of micro-capacitance sensor theoretical based on equivalent feeder line is idle to divide equally control method Download PDFInfo
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- CN105119301B CN105119301B CN201510579785.7A CN201510579785A CN105119301B CN 105119301 B CN105119301 B CN 105119301B CN 201510579785 A CN201510579785 A CN 201510579785A CN 105119301 B CN105119301 B CN 105119301B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention discloses a kind of idle respectively control method of micro-capacitance sensor theoretical based on equivalent feeder line, the idle equilibrium in microgrid can be accurately realized.Inconsistent and feeder line parameter the mismatch locally loaded in micro-capacitance sensor, it is to cause inverter to export idle unbalanced principal element.The network for causing idle balancing error is mismatched factor parametrization by the present invention by equivalent feeder line concept first, and calculates equivalent feeder line parameter in real time using feeder current sensing；Secondly virtual impedance is set according to parameters obtained, by compensating the mismatch factor in connection line, effectively eliminates idle balancing error.Compared to conventional virtual impedance methodologies, the present invention not only allows for local load-factor, and can make parameter regulation in real time for the change of load, realizes exact power equilibrium.
Description
【Technical field】
The invention belongs to microgrid power to distribute field, the control of reactive power equilibrium assignment in more particularly to a kind of micro-capacitance sensor
Method processed.
【Background technology】
The world today is increasingly improved to the attention rate of new energy, such as photovoltaic generation, wind-power electricity generation, miniature gas turbine,
The form of power supply (distributed generation, DG) enters bulk power grid to the green energy resources such as fuel cell in a distributed manner.
With the increase of distributed power source permeability, the problem of new, such as grid stability, the control of DG units are brought to bulk power grid
Deng.
Such issues that to solve, microgrid concept is arisen at the historic moment.It is by coordinating the working methods of DG units, DG that will be scattered
Unit is controlled into unified entirety, and is connected by points of common connection (point of common coupling, PCC) and bulk power grid
Connect.Microgrid can be operated under grid-connected and isolated island both of which：When grid-connected, it is as controllable source；During isolated island, it is net internal loading
Electric power support is provided.Under island mode, the load power in the necessary equilibrium assignment net of each DG units.Droop control method is real
One of important means of existing power equalization.Although droop control can effectively realize active equilibrium, there is idle equilibrium in it all the time
Problem.This is due in microgrid caused by the mismatch of feeder line pressure drop；In addition, when DG units are connected with local load, idle equilibrium
Problem can be aggravated further.As the improved method of droop control, virtual impedance can preferably solve idle respectively problem.
Found by literature search, for virtual impedance solve the problems, such as it is idle divide equally, there is researcher to propose a variety of sides
Case.A kind of is to compensate the mismatch between feeder line by setting virtual impedance to eliminate idle balancing error, but local loading condition
Including not accounting for.One kind is that feeder line pressure drop is estimated by default virtual impedance, to correct droop control coefficient, but in
Between pressure drop estimation be not real-time process, its is ageing poor.Therefore, currently with virtual impedance solve it is idle divide equally it is sagging
Control strategy all has limitation.
【The content of the invention】
It is an object of the invention to provide a kind of idle respectively control method of micro-capacitance sensor theoretical based on equivalent feeder line, in nothing
It is inconsistent with local load to solve the problems, such as that feeder line parameter mismatches under form of communication very well, and has control timeliness well
Property；To overcome current virtual impedance to solve the idle limitation for dividing equally problem.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of micro-capacitance sensor theoretical based on equivalent feeder line is idle to divide equally control method, comprises the following steps：
Step 1, after each DG units installation in micro-grid system, the corresponding feed line impedance value R of each DG units is measuredfiWith
Xfi；
Step 2, DG unit active-power Ps are calculated by each DG units output voltage and output currenti, DG units without
Work(power Qi, by output voltage and feeder current be calculated common load consume active-power Pfi, common load consumption
Reactive power Qfi；
Step 3, by the unknown parameter U in rating formula0Substituted using known quantity, formula is as follows：
According to the transformational relation of impedance and admittance, above formula is reduced to：
Two are obtained by known quantity Pfi、Qfi、Rfi、XfiThe parameter A of expressioni、Bi；
Step 4, the parameter G that equivalent feeder line model usesefi、Befi、Refi、XefiCalculated by above-mentioned several known parameters
Arrive, formula is as follows：
Other two parameter Refi、XefiDrawn by the transformational relation of impedance and admittance；
Step 5, calculated parameter Gefi、Befi、Refi、Xefi, pass through equivalent feeder resistances RefiWith equivalent feeder line
Reactance XefiObtain equivalent feed line impedance Zef, setting virtual impedance value Zv=Zref-Zef, realize the equal sub-control of real-time reactive power
System；Wherein, ZrefFor feeder line reference value, set according to requirement of engineering.
Further, the active power calculating formula of common load consumption is：
The reactive power of common load consumption calculates formula：
Further,
Wherein, GefiAnd BefiFor DG units i equivalent feeder line admittance.
Relative to prior art, the invention has the advantages that：The inconsistent and feeder line locally loaded in micro-capacitance sensor
The mismatch of parameter, it is to cause inverter to export idle unbalanced principal element；The present invention is first by equivalent feeder line concept
The network for causing idle balancing error is mismatched into factor parametrization, and calculates equivalent feeder line in real time using feeder current sensing and joins
Number；Secondly virtual impedance is set according to parameters obtained, by compensating the mismatch factor in connection line, can effectively eliminated idle
Balancing error.Compared to conventional virtual impedance methodologies, the present invention not only allows for local load-factor, and for the change of load
Parameter regulation can be made in real time, realize exact power equilibrium.
【Brief description of the drawings】
Fig. 1 is microgrid structural representation.
Fig. 2 is microgrid model schematic.
Fig. 3 is the equivalent moving model schematic diagram of single DG units.
Fig. 4 is the equivalent feeder line instrumentation plan of implementation.
Fig. 5 is DG units local control strategy schematic diagram.
Fig. 6 is that the power equalization of each inverter under conventional virtual impedance methodologies shows schematic diagram.Wherein, Fig. 6 (a) is active
Power output schematic diagram；Fig. 6 (b) is that reactive power exports schematic diagram.
Fig. 7 is based on the theoretical micro-capacitance sensor equivalent model simulation result schematic diagram of equivalent feeder line.Wherein, Fig. 7 (a) is active
Power output schematic diagram；Fig. 7 (b) is that reactive power exports schematic diagram.
Fig. 8 is that the power equalization of each inverter under adaptive virtual impedance method shows schematic diagram.Wherein, Fig. 8 (a) is to have
Work(power output；Fig. 8 (b) exports for reactive power.
【Embodiment】
The present invention is divided into following components：
1. the parameter mismatch case of external circuit corresponding to each DG units is obtained by modeling, and it is theoretical to introduce equivalent feeder line
Each mismatch parameter is unitized, to set corresponding virtual impedance.
2. calculate based on the theoretical control parameter for needing to use of equivalent feeder line.
3. realize that adaptive the idle of virtual impedance regulation divides equally control method using above-mentioned control parameter.
To solve to influence unbalanced two principal elements of micro-capacitance sensor：Feeder line parameter mismatch and local load are inconsistent,
Each DG units of micro-capacitance sensor as shown in Figure 1 are established equivalent feeder line model by the present invention, are eliminated local load in form, are obtained letter
Change the moving model of DG units, referring to Fig. 2.Based on this model, idle respectively control method is proposed, it is specific as follows：
(1) the equivalent moving model of microgrid
When micro-capacitance sensor enters island mode, each DG units are mutually coordinated, the load power in equilibrium assignment net.Capacity is larger
DG units output active power it is larger.And in idle output facet, feeder line pressure drop mismatches etc. prevent each DG units from
Realize by reactive requirement in appearance distribution net.
For each DG units, power output includes two parts：Local load consuming power through feeder line with transmitting by public
The power of load consumption.It is as follows that the active power of common load consumption calculates formula：
It is as follows that reactive power calculates formula：Wherein GfiAnd BfiFor the conductance component of feeder line
With susceptance component, UiFor the output voltage amplitude of DG units, U0Represent public exchange busbar voltage amplitude, δiFor two
The phase angle difference of voltage.Because power includes two groups of compositions, the operation difference between DG units can not be analyzed intuitively.In order to
Power integration is realized, the present invention proposes that equivalent feeder line is theoretical, and local load consuming power and common load consumption power is whole
It is combined together, obtains result consistent with common load consumption power in form, it is as follows that active power calculates formula：It is as follows that reactive power calculates formula：
Wherein GefiAnd BefiFor the conductance component and susceptance component of DG units i equivalent feeder line.In the case of known to micro-grid system,
Equivalent feeder line parameter can be now uniquely determined.
(2) equivalent feeder line parameter calculates
In the microgrid of droop control application, idle unbalanced problem has external connection circuit parameter mismatch to cause.Pass
When the virtual impedance method of system solves idle unbalanced problem, directly matching does not include the feeder line parameter of local load information.This
Virtual impedance is matched equivalent feeder line, solves idle equalization problem by invention from the angle of equivalent moving model.It is wherein virtual
The setting value Z of impedancevIt is parameter compensation standard value ZrefWith equivalent feeder line virtual impedance ZefDifference.
P can be calculated by DG units output voltage and output currenti、Qi, can be obtained by output voltage and feeder current
To Pfi、Qfi.Under normal circumstances, the voltage magnitude U of micro-capacitance sensor PCC points0It is unknown, therefore the present invention utilizes feeder line power information Pfi
With QfiEquivalent feeder line parameter is calculated indirectly.After each DG units installation, the resistance value R of its corresponding feeder linefiWith reactance value XfiGu
Surely it can survey, therefore by calculating, the unknown message in formula can be passed through Pfi、Qfi、Rfi、XfiRepresent.With reference to micro-grid system
Know parameter Pi、Qi, the equivalent feeder line parameter G of micro-capacitance sensor can be obtainedefi、Befi、Refi、Xefi, and then setting for virtual impedance can be obtained
Definite value.
(3) adaptive idle respectively control method
The parameter of equivalent feeder line model is obtained from the local measurement of DG units, and the measurement between parameter is mutual not
Influence, therefore equivalent feeder line is calculated when DG units are run, and can be carried out in real time.
Referring to Fig. 5, the feeder current of DG unit runtime systems changes, and can influence Pi、QiEtc. parameter.Such system
Equivalent feeder line parameter G can be obtained in real timeefi、Befi、Refi、XefiDeng change, influence the setting value of virtual impedance and virtual electricity
Pressure, so as to realize adaptive idle Balance route.
During stable state, each DG units calculate equivalent feed line impedance in real time according to feeder current information, and respective settings virtually hinder
Resist to compensate the mismatch of external physical connection circuit.When the load, whether local load or common load, new
Mismatching information can feed back in equivalent feeder line calculating immediately, so as to cause the adaptive change of virtual impedance.Pass through this side
Formula, idle equilibrium remain accurate.
Refer to shown in Fig. 5, a kind of micro-capacitance sensor theoretical based on equivalent feeder line of the present invention is idle to divide equally control method, passes through
The power situation of measurement micro-grid system in real time, using equivalent feeder line model, calculates the virtual impedance value under different situations, real
The reactive power of existing micro-capacitance sensor is divided equally.Specifically include following steps：
Step 1, after each DG units installation in micro-grid system, the corresponding feed line impedance value R of each DG units is measuredfiWith
Xfi；RfiFor resistance, XfiFor reactance；
Step 2, referring to Fig. 4, DG unit active-power Ps are calculated by DG units output voltage and output currenti、DG
Unit reactive power Qi, by the output voltage and feeder current of DG units be calculated common load consume active power
Pfi, common load consumption reactive power Qfi.Equivalent feeder line is calculated when DG units are run, and can be carried out simultaneously.
Step 3, the unknown parameter U0 in rating formula is substituted using known quantity, formula is as follows：
Wherein Gefi、Befi、Refi、XefiRepresent admittance and the impedance parameter of equivalent feeder line model.According to impedance and admittance
Transformational relation, above formula can be reduced to：
Two can now be obtained by known quantity common load active-power Pfi, common load reactive power Qfi、Rfi、Xfi
The parameter A of expressioni、Bi。
Step 4, the parameter G that equivalent feeder line model usesefi、Befi、Refi、XefiIt can be calculated by above-mentioned several known parameters
Arrive, formula is as follows：
Other two parameter Refi、XefiDrawn by the transformational relation of impedance and admittance.
Step 5, calculated parameter Gefi、Befi、Refi、Xefi, pass through equivalent feeder resistances RefiWith equivalent feeder line
Reactance XefiObtain equivalent feed line impedance Zef, setting virtual impedance value Zv=Zref-Zef, realize the equal sub-control of real-time reactive power
System；Wherein, ZrefFor feeder line reference value, set according to requirement of engineering.
The micro-capacitance sensor theoretical based on equivalent feeder line proposed by the present invention is idle to divide equally control method, it is contemplated that feeder line parameter is not
Situations such as matching and inconsistent local load, the distribution condition of reactive power in micro-capacitance sensor can be adjusted in real time.Simulation result
As shown in Figure 8, at the 2s moment, three inverters introduce adaptive virtual impedance control simultaneously.Compensated by virtual impedance etc.
The mismatch degree between feeder line is imitated, the mismatch degree of external connection circuit has obtained equivalent compensation.From simulation result, the strategy
Idle balancing error is eliminated well, realizes accurately idle equilibrium.At the 6s moment, net interior load and change.It can see
Go out, based on feeder current sensing equivalent feeder line calculate can rapid feedback network mismatch degree, adjust virtual impedance rapidly,
Recover the idle balanced degree of accuracy in the extremely short time.
Claims (1)
1. a kind of micro-capacitance sensor theoretical based on equivalent feeder line is idle to divide equally control method, it is characterised in that comprises the following steps：
Step 1, after each DG units installation in micro-grid system, the corresponding feed line impedance value R of each DG units is measuredfiWith Xfi；
Step 2, DG unit active-power Ps are calculated by each DG units output voltage and output currenti, DG units are idle work(
Rate Qi, by output voltage and feeder current be calculated common load consume active-power Pfi, common load consumption nothing
Work(power Qfi；
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The reactive power of common load consumption calculates formula：
Step 3, by the unknown parameter U in rating formula0Substituted using known quantity, formula is as follows：
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<mo>-</mo>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
<msub>
<mi>B</mi>
<mi>i</mi>
</msub>
</mrow>
<mrow>
<msubsup>
<mi>A</mi>
<mi>i</mi>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<msubsup>
<mi>B</mi>
<mi>i</mi>
<mn>2</mn>
</msubsup>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
Other two parameter Refi、XefiDrawn by the transformational relation of impedance and admittance；
Step 5, calculated parameter Gefi、Befi、Refi、Xefi, pass through equivalent feeder resistances RefiWith equivalent feeder line reactance
XefiObtain equivalent feed line impedance Zef, setting virtual impedance value Zv=Zref-Zef, realize that real-time reactive power is divided equally and control；Its
In, ZrefFor feeder line reference value.
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