CN105576708B - Idle equilibrium assignment control method during inverter parallel in a kind of micro-capacitance sensor - Google Patents
Idle equilibrium assignment control method during inverter parallel in a kind of micro-capacitance sensor 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
- H02J3/46—Controlling of the sharing of output between the 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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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- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention relates to idle equilibrium assignment control method during inverter parallel in a kind of micro-capacitance sensor, comprise the following steps：1) central controller gathers the reactive power of each DG outputs, draws total reactive power Qa；2) according to total reactive power QaWith each each DG of DG calculation of capacity given reactive power；3) integral controller adjusts virtual impedance value according to each DG given reactive power and the difference of corresponding reality output reactive power, obtains each DG adaptive virtual impedance；4) according to droop control and the adaptive virtual impedance, the reference voltage of voltage x current double -loop control is obtained, adjusts corresponding DG idle output.Compared with prior art, the present invention adds adaptive virtual impedance with voltage drop drop caused by compensated line difference in traditional droop control strategy, resistance difference is eliminated to the influence without the distribution of work, idle reasonable distribution can also be realized when load power factor changes, and without the impedance value of measurement circuitry.
Description
Technical field
The present invention relates to the micro-capacitance sensor technical field in power system, more particularly, to inverter parallel in a kind of micro-capacitance sensor
The control method of reactive power reasonable distribution during operation.
Background technology
Micro-capacitance sensor by distributed power source (distributed generation, DG), energy storage device, energy conversion device,
The equipment such as protection device and load forms, and can run on grid-connected and isolated island both of which.When micro-grid connection is run, voltage and frequency
Rate is determined by system, can be easier to reach power-sharing.
Traditional droop control of micro-capacitance sensor is to be exported according to the active and idle of each DG units output to adjust each inverter
Voltage magnitude and frequency, droop control equation can be expressed as：
In formula：ω0、U0Respectively each DG zero loads when the voltage angular frequency that exports and amplitude；Pi、QiRespectively i-th of DG is defeated
Go out active power and reactive power；mi、niRespectively i-th DG active sagging coefficient and idle sagging coefficient；ωi、UiRespectively
For the voltage angular frequency and amplitude of i-th of DG output.
Fig. 1 gives traditional droop control block diagram of formula (1) expression, i in figureoFor inverter output inductor electric current；uo
For inverter output filter capacitor voltage；ω, U are respectively voltage angular frequency and the amplitude that droop control device adjusts to obtain, to
The reference voltage of resultant voltage double current loop modulation.
Traditional droop control proposes under conditions of inverter output impedance and line impedance sum is perception.Micro- electricity
Netcom is frequently with low-voltage transmission circuit, and line impedance is mainly in resistive in low pressure micro-capacitance sensor, according to traditional droop control, voltage
The adjustment of amplitude influences whether active power, and the adjustment of frequency will also have influence on idle, active and reactive power coupling.It is generally logical
Addition virtual impedance is crossed, realizes active and idle decoupling.
Due to the global variable that frequency is micro-grid system, phase angle is proportional to frequency, therefore active power can be by tradition
The active sagging coefficient of droop control method carries out reasonable distribution.And voltage is local variable, if each DG be connected to it is commonly connected
The line length of point is inconsistent, then is had differences between DG line impedance, cause reactive power to divide equally.
Two capacity identical DG parallel runnings, are jointly load supplying, capacity and idle sagging coefficient all same.If
DG1Connection line inductance be less than DG2, represent that droop control can obtain idle distribution condition as shown in Figure 2 according to formula (1).Due to
Line inductance is inconsistent, and two DG load curve of output slope is different, and output end voltage is also different.DG2Line inductance compared with
DG1Greatly, load curve of output slope is larger, and the terminal voltage of output is larger, thus distribution is idle smaller, idle to divide equally.
Fig. 3 is the isolated island type micro-capacitance sensor equivalent circuit of two DG parallel runnings, and DG is connected to public affairs by different line impedances
Tie point altogether.
In Fig. 3：R, Χ is DG1With DG2The line impedance of formed objects；Δ R, Δ Χ are DG1With DG2Line impedance it
Difference；ΔU1、ΔU2Respectively DG1And DG2Voltage landing of the output voltage to PCC points.If DG2Line impedance be more than DG1, according to
Fig. 3 can be released：
In formula, Δ U2 -、ΔU2' it is respectively DG2Power output is passed through and DG1Same line impedance and the production of different line impedances
Raw voltage landing.Voltage drop drop caused by line impedance difference causes reactive power rationally to divide according to sagging coefficient
Match somebody with somebody.
The reasonable distribution problem of reactive power is one of focus of micro-capacitance sensor research.It is in parallel to find a kind of microgrid inverter
Control strategy is run, it is most important for the reactive power between reasonable distribution inverter.
The shortcomings that prior art and the application motion will solve the problems, such as：
Micro-capacitance sensor uses traditional droop control strategy,, will when each DG line impedance is inconsistent during inverter parallel
Cause reactive power to divide equally according to the progress of sagging coefficient is idle, reactive circular power flow is produced between inverter, influences power network electric energy
Quality.
Many domestic and foreign scholars are attempted traditional droop control being improved.By injecting amplitude very in DG output voltages
Small harmonic wave, using harmonic voltage frequency it is all identical in whole microgrid the characteristics of realize pro rate reactive power, it is but humorous
The injection of wave voltage makes DG output voltages electric current produce distortion, the easy quilt of harmonic wave particularly in output impedance is in the circuit of perception
Amplification, influence the quality of power supply of power network.Droop control coefficient by adjusting inverter can improve reactive power distribution deviation and ask
Topic, but excessive sagging coefficient can cause inverter output point voltage and points of common connection (point of common
Coupling, PCC) voltage landing, or even influence micro-capacitance sensor operation stability.It is by adding virtual impedance that inverter is defeated
Go out impedance design for perception, to meet the application conditions of traditional droop control method, realize rational power distribution, but line need to be known
Road impedance value, line impedance value is difficult to accurately measure in Practical Project.And the virtual impedance value that this method adds immobilizes, when
When load power factor changes, can not accurately it be distributed between DG idle.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of convenience of calculation, control
Idle equilibrium assignment control method during inverter parallel in the high micro-capacitance sensor of precision.
The purpose of the present invention can be achieved through the following technical solutions：
Idle equilibrium assignment control method during inverter parallel, comprises the following steps in a kind of micro-capacitance sensor：
1) central controller gathers the reactive power of each DG outputs, draws total reactive power Qa：
Wherein, QiFor the reactive power of i-th of DG output, i=1,2 ..., n, n is DG total number；
2) according to total reactive power QaWith each each DG of DG calculation of capacity given reactive power；
3) integral controller is adjusted according to each DG given reactive power and the difference of corresponding reality output reactive power
Virtual impedance value, obtain each DG adaptive virtual impedance；
4) according to droop control and the adaptive virtual impedance, the reference voltage of voltage x current double -loop control is obtained, is adjusted
Save corresponding DG idle output.
When multiple DG capacity of parallel connection are identical, in the step 2), each DG given reactive power passes through below equation
Calculate：
Qi0=Qa/n。
When multiple DG capacity differences of parallel connection, in the step 2), each DG given reactive power according to each DG appearance
Amount carries out pro rate：
Qi0=riQa
Wherein, riFor i-th of DG capacity ratio, ri=Ci/Ca, CiFor i-th of DG capacity, CaFor each DG total appearance
Amount.
In the step 3), the expression formula of adaptive virtual impedance is：
Wherein, LivFor i-th of DG adaptive virtual impedance, QiFor i-th of DG reality output reactive power, Qi0For
I DG given reactive power, K are integral coefficient.
The step 4) is specially：
401) the first voltage reference value by one DG of droop control device acquisition and corresponding phase angle θ；
402) the filter inductance electric current i for being exported corresponding inverter according to voltage phase angle θoDp conversion is carried out, obtains idWith
iq；
403) i obtained according to step 402)dAnd iqAnd step 3) obtains corresponding DG adaptive virtual impedance, obtains
Second voltage reference value；
404) it is first voltage reference value and second voltage reference value is superimposed, obtain the reference of voltage x current double -loop control
Voltage.
Compared with prior art, the present invention has advantages below：
(1) present invention carries out the regulation of virtual impedance by load power, it is not necessary to the impedance value of measurement circuitry, controlling party
Method is realized simple；
(2) present invention can conveniently realize dividing equally for DG reactive powers when DG line impedances are inconsistent, i.e., by inverter capacity
Ratio reasonable distribution is idle.
(3) when load power factor changes, the present invention can also facilitate, accurately realize idle reasonable distribution.
Brief description of the drawings
Fig. 1 is traditional droop control block diagram；
Two DG idle distribution conditions when Fig. 2 is line inductance difference；
Fig. 3 is two DG parallel equivalent circuits；
Fig. 4 is the adaptive virtual impedance control block diagram of the present invention；
Fig. 5 be DG capacity it is identical when tradition droop control method under active power and reactive power simulation result figure；
Fig. 6 be DG capacity it is identical when control method of the present invention under active power and reactive power simulation result figure；
Active power and reactive power simulation result under control method of the present invention when Fig. 7 is DG capacity differences.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Idle equilibrium assignment control method when the present embodiment provides inverter parallel in a kind of micro-capacitance sensor, center control
Device exports general power and each inverter capacity according to inverter, calculate each inverter to constant volume, be subsequently sent to inversion
Device locally controls, and for adjusting virtual impedance size, voltage drop drop, realizes load power caused by compensated line resistance difference
High precision distribution.The control method specifically includes following steps：
1) central controller gathers the reactive power of each DG outputs, draws total reactive power Qa：
Qa=Q1+Q2+…+Qn (4)
Wherein, QiFor the reactive power of i-th of DG output, i=1,2 ..., n, n is DG total number.
2) according to total reactive power QaWith each each DG of DG calculation of capacity given reactive power.When multiple DG capacity of parallel connection
When identical, load power allows each inverter to divide equally, and each DG given reactive power is calculated by below equation：
Qi0=Qa/n。
When multiple DG capacity differences of parallel connection, each DG given reactive power carries out ratio point according to each DG capacity
Match somebody with somebody：
Qi0=riQa
Wherein, riFor i-th of DG capacity ratio, ri=Ci/Ca, CiFor i-th of DG capacity, CaFor each DG total appearance
Amount.
3) integral controller is adjusted according to each DG given reactive power and the difference of corresponding reality output reactive power
Virtual impedance value, obtain each DG adaptive virtual impedance：
Wherein, LivFor i-th of DG adaptive virtual impedance, QiFor i-th of DG reality output reactive power, Qi0For
I DG given reactive power, K are integral coefficient.
4) according to droop control and the adaptive virtual impedance, the reference voltage of voltage x current double -loop control is obtained, is adjusted
Corresponding DG idle output is saved, specific control block diagram is as shown in Figure 4：
401) the first voltage reference value by one DG of droop control device acquisition and corresponding phase angle θ, can be by the first electricity
Reference value conversion is pressed to obtain UdAnd Uq；
402) the filter inductance electric current i for being exported corresponding inverter according to voltage phase angle θoDp conversion is carried out, obtains idWith
iq；
403) i obtained according to step 402)dAnd iqAnd step 3) obtains corresponding DG adaptive virtual impedance, obtains
Second voltage reference value；
404) it is first voltage reference value and second voltage reference value is superimposed, obtain the reference of voltage x current double -loop control
Voltage.
Microgrid inverter parallel running simulation model has been built on Matlab/Simulink software emulation platforms, has been used
To verify the validity of proposition method of the present invention.Simulation model is made up of two DG, and parallel connection is powered for linear load.Load parameter
For：P1=2.5kW, Q1=1kvar；P2=4.5kW, Q2=1kvar.When operating mode 1 simulation analysis, two DG capacity are identical, contrast
Analysis inverter be respectively adopted Traditional control strategy and when control method of the present invention changes to micro-grid load power distribution shadow
Ring；The simulating, verifying inverter of operating mode 2 uses control method of the present invention in DG capacity differences to the accuracy of sharing of load.Emulation
Parameter is as shown in table 1.
The simulation parameter of table 1
Operating mode 1
Two capacity identical DG parallel runnings, only input load 1 before 1s, active power and reactive power are respectively
2.5kW, 1kvar, load 2 also puts into operation during 1s, and systematic steady state operation afterload active power and reactive power are changed into respectively
7kW and load 2 is out of service when 2kvar, 2s, systematic steady state operation afterload active power and reactive power become again 2.5kW and
1var, simulation time 3s.When two DG use traditional droop control, DG power outputs are as shown in Figure 5.
Due to DG1With DG2Capacity it is identical, to reach reactive power reasonable distribution, when system operation is in stable state
When, distribution of each DG to load or burden without work should be equal.It can be drawn by Fig. 5, the DG of two identical capacity is sagging using tradition
During control method parallel running, before and after load change, DG can divide equally active power according to active sagging coefficient, but due to even
The presence of link resistance difference, DG2Line impedance is compared with DG1Less load or burden without work is assigned with greatly, reactive power can not be pressed
The coefficient that hangs down, which is realized, to be divided equally.
When two DG use control method of the present invention, DG1And DG2Power output is as shown in Figure 6.
As seen from Figure 6, when the DG of two identical capacity uses control method parallel running of the present invention, in load change
Front and rear, DG can divide equally according to active sagging coefficient to active, and adaptive virtual impedance is added in droop control and is mended
Voltage drop drop caused by line impedance difference is repaid, it is idle also to realize high precision by sagging coefficient in line impedance difference
Distribution.
Operating mode 2
DG1With DG2Parallel running, rated capacity ratio are 1:2.All use control method of the present invention, simulation process and operating mode 1
Identical, inverter output is active and reactive power simulation waveform is as shown in Figure 7.
Realize the reasonable distribution of power, DG1With DG2Distribution power ratio should be 1:2.As seen from Figure 7, inverter is defeated
The active power gone out can be according to DG capacity ratio distribution loads, DG before and after load power factor change1With DG2Distribution power
The ratio between be 1:2.Using control method of the present invention, inverter output reactive power meets 1:2 requirement.The load point in 1s and 2s
Zeng Jia and it not reduce, the reactive power before inverter remains to distribute by DG capacity ratios, and transitional processes are smooth and the time is short.
The present embodiment demonstrates validity of the present invention to reasonable distribution DG reactive powers well.
Claims (1)
1. idle equilibrium assignment control method during inverter parallel in a kind of micro-capacitance sensor, it is characterised in that including following step
Suddenly：
1) central controller gathers the reactive power of each DG outputs, draws total reactive power Qa：
<mrow>
<msub>
<mi>Q</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
</mrow>
Wherein, QiFor the reactive power of i-th of DG output, i=1,2 ..., n, n is DG total number；
2) according to total reactive power QaWith each each DG of DG calculation of capacity given reactive power；
3) integral controller is adjusted virtual according to each DG given reactive power and the difference of corresponding reality output reactive power
Impedance value, obtain each DG adaptive virtual impedance；
4) according to droop control and the adaptive virtual impedance, the reference voltage of voltage x current double -loop control is obtained, adjusts phase
Answer DG idle output；
When multiple DG capacity of parallel connection are identical, in the step 2), each DG given reactive power is calculated by below equation：
Qi0=Qa/n
When multiple DG capacity differences of parallel connection, in the step 2), each DG given reactive power is entered according to each DG capacity
Row pro rate：
Qi0=riQa
Wherein, riFor i-th of DG capacity ratio, ri=Ci/Ca, CiFor i-th of DG capacity, CaFor each DG total capacity；
In the step 3), the expression formula of adaptive virtual impedance is：
<mrow>
<msub>
<mi>L</mi>
<mrow>
<mi>i</mi>
<mi>v</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mi>K</mi>
<mi>s</mi>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
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<mrow>
<mi>i</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>)</mo>
</mrow>
</mrow>
Wherein, LivFor i-th of DG adaptive virtual impedance, QiFor i-th of DG reality output reactive power, Qi0For i-th
DG given reactive power, K are integral coefficient；
The step 4) is specially：
401) the first voltage reference value by one DG of droop control device acquisition and corresponding phase angle θ；
402) the filter inductance electric current i for being exported corresponding inverter according to voltage phase angle θoDp conversion is carried out, obtains idAnd iq；
403) i obtained according to step 402)dAnd iqAnd step 3) obtains corresponding DG adaptive virtual impedance, obtains second
Voltage reference value；
404) it is first voltage reference value and second voltage reference value is superimposed, obtain the reference electricity of voltage x current double -loop control
Pressure.
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| CN106681147B (en) * | 2017-01-09 | 2020-06-26 | 中南大学 | Distributed control method for direct-current micro-grid |
| CN106684933B (en) * | 2017-03-03 | 2019-05-28 | 燕山大学 | It is a kind of based on harmonic injection without the idle accurate distribution method in the micro- source of interconnection line isolated island |
| CN109167371B (en) * | 2018-10-29 | 2023-12-08 | 四川大学 | Virtual inductive reactance regulator for realizing reactive power sharing of parallel inverter and control method |
| CN109728604A (en) * | 2019-01-09 | 2019-05-07 | 上海电力学院 | Isolated island exchange microgrid power based on adaptive virtual impedance divides equally control method |
| CN110071527A (en) * | 2019-04-26 | 2019-07-30 | 西安理工大学 | It is divided in portion load or burden without work and voltage amplitude-frequency self-adjusting improves droop control method |
| CN112018803B (en) * | 2019-05-28 | 2022-03-15 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power control method and device based on parallel double inverters |
| CN112086996B (en) * | 2020-08-08 | 2022-05-24 | 东北电力大学 | Agent-based improved droop control method for parallel inverter |
| CN112104001A (en) * | 2020-10-12 | 2020-12-18 | 四川科陆新能电气有限公司 | Power supply droop coefficient optimization control method |
| CN112564167B (en) * | 2020-12-04 | 2022-03-29 | 太原理工大学 | Improved droop control method based on consistency algorithm |
| CN112260287A (en) * | 2020-12-19 | 2021-01-22 | 高生凯 | Novel photovoltaic microgrid droop reactive compensation control method |
| CN114243761A (en) * | 2021-11-25 | 2022-03-25 | 国网山东省电力公司烟台供电公司 | Control method and system for switching on-grid operation mode and off-grid operation mode of micro-grid vehicle |
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