CN209046276U - Shunt chopper power-sharing device based on electric current droop characteristic - Google Patents
Shunt chopper power-sharing device based on electric current droop characteristic Download PDFInfo
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- CN209046276U CN209046276U CN201821730763.1U CN201821730763U CN209046276U CN 209046276 U CN209046276 U CN 209046276U CN 201821730763 U CN201821730763 U CN 201821730763U CN 209046276 U CN209046276 U CN 209046276U
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Abstract
Shunt chopper power-sharing device based on electric current droop characteristic.Power-sharing device is made of D.C. regulated power supply, inversion control unit, load, central controller；Central controller connects common bus, is connected with inversion control unit input terminal.N inversion control unit in parallel on common bus, wherein n >=2, and be connected with linear and nonlinear on bus and load；Each inversion control unit is made of a three-phase inverter, line impedance, the sagging control module of improved electric current, voltage and current dual-loop controller, SPWM pulse modulation module；The DC side of three-phase inverter accesses DC power supply Vdc, the sagging control module synthesized reference voltage of the improved electric current of electric current of three-phase inverter output finely tunes by voltage and current dual-loop controller and SPWM pulse modulation module again, and output SPWM wave is to control inverter.The utility model microgrid inverter reactive power is divided equally in proportion, eliminates circulation, improves power quality.
Description
Technical field
The utility model category power electronics controls scope, is related to the sagging control field of gird-connected inverter electric current, and specifically one
Shunt chopper power-sharing device of the kind based on electric current droop characteristic.
Background technique
In recent years, with the continuous deterioration of the reduction of fuel energy resource and environment, more and more renewable energy are logical
It crosses in distributed power generation (DG, distribution generation) access micro-capacitance sensor, so that micro-capacitance sensor is increasingly becoming research
Hot spot.During micro-capacitance sensor isolated operation, the benchmark of voltage and frequency is provided without bulk power grid, is just entire electricity by inverter
Net provides voltage and frequency, and therefore, the control of inverter is most important, largely affects the power quality of micro-capacitance sensor.
In the prior art, the sagging control methods that inverter generallys use select frequency similar with conventional electric generators primary
Droop characteristic (Droop Character) is used as control mode, the i.e. active power to the inverter output in micro-capacitance sensor
It is respectively controlled with reactive power, to obtain stable frequency and voltage, is not necessarily to communication line, cost is relatively low, control method
Simply, the effect that plug and play may be implemented is the first choice in microgrid inverter control method.But traditional sagging control
Method depends on the characteristic of line impedance, and the inconsistent power that will lead to inverter output of line impedance can not be divided equally, or even produce
Raw serious circulation；Therefore, this method is mostly just for the inverter parallel of identical capacity, and different capabilities in practice
Inverter be inevitably present, it is that the inverter parallels of different capabilities generates the result is that cause power distribution uneven,
Even equipment generation is seriously affected.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, to propose that a kind of improved gird-connected inverter electric current is sagging
Control method, on the basis of the shunt chopper power-sharing device based on electric current droop characteristic, by measuring and calculating public affairs
The average value of reactive current at Coupling point (point of common coupling, PCC) altogether, is fed back to each inversion
In the reactive current sampled value of device, the voltage that reactive current sagging curve is adjusted using the Following effect of integral controller is inclined
It sets, eliminates the inconsistent influence of line impedance to reach, divide equally so that microgrid inverter reactive power is proportional by measure, and
Without calculating active power and reactive power value, circulation is eliminated, power quality can be improved, moreover it is possible to save the cost.
What the purpose of this utility model was achieved in that:
Based on the shunt chopper power-sharing device of electric current droop characteristic by D.C. regulated power supply, inversion control unit,
Load, central controller are constituted；Central controller connects common bus, is connected with inversion control unit input terminal.Common bus
N inversion control unit of upper parallel connection, wherein n >=2, and be connected with linear and nonlinear on bus and load；Each inversion control list
Member is by a three-phase inverter, line impedance, the sagging control module of improved electric current, voltage and current dual-loop controller, SPWM arteries and veins
Modulated module composition；The DC side of three-phase inverter accesses DC power supply Vdc, the electric current i of three-phase inverter outputa、ib、icThrough
It crosses the sagging control module synthesized reference voltage of improved electric current, finely tuned again by voltage and current dual-loop controller and SPWM pulse tune
Molding block exports SPWM wave to control inverter.
The three-phase inverter is made of three single-phase inversion circuits and LC filter two parts, single-phase inversion circuit by
The diode of IGBT power tube and inverse parallel between the EC grade of power tube IGBT is constituted, and LC filter contains filter inductance and filtering
Capacitor；
The sagging control ring of improved electric current is by the sagging control module of electric current, subtracter, integrator and current average
Computing module composition, the electric current i of inverter outputa、ib、icThrough over-sampling and reactive current i is calculatedpnWith watt current value
iqn, central controller calculates current average by current average computing module, and calculated current average is anti-
It is fed to sampler；The reactive current average value i found outqavAnd the reactive current value i of n-th inverter reactive current sampled valueqn
It is poor to make in subtracter, adjusts voltage bias △ U using integral controller module, is sent into the sagging control module of electric current.
The voltage and current is bicyclic to be made of outer voltage and inductive current outer ring, and outer voltage uses proportional plus integral control
Circuit, inductive current inner ring use ratio control circuit.
Three single-phase inversion circuits of the three-phase inverter are by six IGBT power tube S1, S2, S3, S4, S5, S6With six
A diode VD1, VD2, VD3,VD4,VD5, VD6Composition, diode VD1, VD2, VD3,VD4,VD5, VD6Inverse parallel is in power tube
IGBTS1, S2, S3, S4, S5, S6EC grade between.
LC filter circuit is by filter inductance L1, L2, L3With three-phase filter capacitor C1, C2, C3Composition, three-phase filter capacitor use
Star connection, the N-terminal of input voltage are filter capacitor midpoint.
In voltage and current dual-loop controller, L1, C1 are the inductance and capacitor of filter, in the output of outer voltage is used as
The given value of ring, inner ring Setting signal are compared with the DC quantity after outputting inductance electric current rotation transformation, and error signal is through adjusting
Device operation is saved, the control signal of inner ring is obtained；This control signal is finally sent into SPWM generator, compared with carrier modulation
The SPWM signal generated afterwards controls the switching tube of inverter bridge after driving circuit.
The current average, which calculates, selects the central controller with computing function to complete；
The subtracter is made of operational amplifier A and resistance R1~R4, wherein R3=R4。
The integral controller is made of operational amplifier A and resistance R5~R6, capacitor C.
The central controller with sampling and computing function is TMS320F28069 core board, the operational amplifier
The LM107 module of A selection.
The good effect of the utility model is:
1, the utility model proposes a kind of improved gird-connected inverter electric current droop control methods, by sagging based on electric current
The shunt chopper power-sharing device of characteristic eliminates circulation so that microgrid inverter reactive power is divided equally in proportion, improves
Power quality.
2, the sagging control of tradition calculates active reactive power and needs to obtain stable power plus a low-pass filter
Value will cause dynamic stability decline, and the utility model, only need to be by exporting electric current without calculating active power and reactive power
Calculating watt current and reactive current can be controlled.The stability and dynamic responding speed of system are increased, control is more
Add accurate and simpler.
Detailed description of the invention
Fig. 1 is the shunt chopper power-sharing device overall structure frame based on electric current droop characteristic of the utility model
Figure.
Fig. 2 is three-phase full-bridge inverter structural block diagram.
Fig. 3 is the sagging control module structural block diagram of improved electric current.
Fig. 4 is the integrating circuit figure in the module of the sagging control ring of improved electric current.
Fig. 5 is voltage and current double -loop control module parameter figure.
Fig. 6 is that the shunt chopper of same capacity does not use the utility model and the reactive capability curve using the utility model
Figure.In figure, vertical element is the reactive capability curve of inverter 1, and dashed bars are the reactive capability curve of inverter 2.
Fig. 7 is that different capabilities inverter does not use the utility model and the reactive capability curve figure using the utility model.
In figure, vertical element is the reactive capability curve of inverter 1, and dashed bars are the reactive capability curve of inverter 2.In figure, 1 is direct current
Regulated power supply, 2 be three-phase inverter, and 3 be line impedance, and 4 be load, and 5 be central controller, and 6 be mean value calculation module, 7
It is subtracter, 8 be integral controller, and 9 be the sagging control module of electric current, and 10 be voltage and current dual-loop controller, and 11 be SPWM tune
Device processed, 12 be the sagging control module of improved electric current, and 13 be inversion control unit；
S1~S8For IGBT power switch tube, VD1~VD6For freewheeling diode, L1~L3For filter inductance, C1~C3For filter
Wave capacitor, Cdc1、Cdc2For DC side input capacitance, VdcInput voltage is surveyed for direct current, R1~R4 is the resistance in subtracter 7,
In, R3=R4, R5~R6 is resistance in integral controller 8, and C is capacitor in integral controller 8, and PI is proportional and integral controller.
Specific embodiment
Referring to attached drawing 1.
Based on the shunt chopper power-sharing device of electric current droop characteristic by D.C. regulated power supply 1, inversion control unit
13, load 4, central controller 5 are constituted；Central controller connects common bus, is connected with inversion control unit input terminal；It is public
N inversion control unit in parallel on bus, wherein n >=2, and be connected with linear and nonlinear on bus and load；Each inversion control
Unit processed is by a three-phase inverter 2, line impedance 3, the sagging control module 12 of improved electric current, voltage and current dual-loop controller
10, SPWM pulse modulation module 11 forms；The DC side of three-phase inverter accesses DC power supply Vdc, the electricity of three-phase inverter output
Flow ia、ib、icThe sagging control module synthesized reference voltage of improved electric current is finely tuned by voltage and current dual-loop controller again
With SPWM pulse modulation module, SPWM wave is exported to control inverter.
Referring to attached drawing 2.
The three-phase inverter 2 is made of three single-phase inversion circuits and LC filter two parts, single-phase inversion circuit by
The diode of IGBT power tube and inverse parallel between the EC grade of power tube IGBT is constituted, and LC filter contains filter inductance and filtering
Capacitor.
In the present embodiment, inversion control unit 13 is 2 of parallel connection.Each inversion control unit is by a three-phase inverter
2, the sagging control module 12 of line impedance 3, improved electric current, voltage and current dual-loop controller 10, SPWM pulse modulation module 11
Composition.
Each three-phase inverter is by six IGBT power tube S1, S2, S3, S4, S5, S6With six diode VD1, VD2,
VD3,VD4,VD5, VD6Composition.Six diode VD1, VD2, VD3,VD4,VD5, VD6Inverse parallel is in power tube IGBTS respectively1, S2,
S3, S4, S5, S6EC grade between, constitute unidirectional inverter circuit.LC filter circuit is by filter inductance L1, L2, L3With three-phase filtered electrical
Hold C1, C2, C3Composition, three-phase filter capacitor use star connection, and the N-terminal of input voltage is filter capacitor midpoint.
In the voltage and current dual-loop controller 10, L1, C1 are the inductance and capacitor of filter, and the output of outer voltage is made
For the given value of inner ring, inner ring Setting signal is compared with the DC quantity after outputting inductance electric current rotation transformation, error signal
Through adjuster operation, the control signal of inner ring is obtained；This control signal is finally sent into SPWM generator, with carrier modulation ratio
The SPWM signal generated more afterwards controls the switching tube of inverter bridge after driving circuit.
In the present embodiment, the central controller with computing function is TMS320F28069 core board,
The LM107 module of the operational amplifier A selection.
Subtracter 7 is made of operational amplifier A and resistance R1~R4, wherein R3=R4,
Integral controller 8 is made of operational amplifier A and resistance R5~R6, capacitor C.
As can be seen from Figure 4, the electric current i of inverter outputa、ib、icPass through current average through over-sampling and through central controller
Computing module calculates current average, and reactive current i is calculatedpnWith watt current value iqn, and calculated electric current is put down
Mean Value Feedback is to sampler；The reactive current average value i found outqavAnd the idle electricity of n-th inverter reactive current sampled value
Flow valuve iqnIt is poor to be made by subtracter, adjusts voltage bias by integral action
It is sent into the sagging control module of electric current；The integral constant k of reactive currentqcIt is adjusted by the selection formula of resistance:
I obtained by calculationqavThe i obtained with samplingqnDifference is obtained by a subtracter, multiplied by reactive current product
Divide constant, by integral controller.
iqavMeet the output of central controller, iqnConnect the sampler of n-th inverter.What output connect is the sagging module of electric current,
Referring to attached drawing 3, Fig. 5.
The present embodiment has been built simulation model in software Matlab and has been verified.
The inverter reactive power of shunt chopper power-sharing device based on electric current droop characteristic is divided equally in proportion, is led to
Current instantaneous value i is exported at the central controller acquisition point of common coupling PCC point crossed on common busa、 ib、icCarry out α β change
It changes, obtains component i on α coordinate system respectivelyαWith component i on β coordinate systemβ, instantaneous reactive current value is obtained according to instantaneous theoretical calculation
iq, it is average that reactive current is obtained according to the ratio of parallel connection three-phase full-bridge inverter reactive current value each in shunt chopper module
Value ipavAs a reference value of each inverter, a reference value is transferred to the reactive current sampled value of each three-phase full-bridge inverter
On subtract each other make it is poor, multiplied by the integral constant k of reactive currentqi, feed back onto electric current droop characteristic, pass through integral controller
Following effect adjusts the biasing of idle power output, to make reactive current is proportional by measure to divide equally, eliminates circulation, is finally reached function
The purpose that rate is divided equally.
Fig. 3 shows the process of the sagging equation of average current based on the sagging control of electric current, gained UnAnd ωnFinal synthesis
La tension de reference Uref est.
Simulation parameters are provided that
Filter parameter is set as Lf1=Lf2=0.6mH, Cf1=Cf2=1500uF, simulation time 5s, simulation step length 5e-
6s, system voltage 800V, line impedance are respectively 0.1 Ω+j0.2mH and 0.1 Ω+j0.45mH, the specified line electricity of three-phase load
Pressure is 380V, and institute's band active load and reactive load are respectively 50KW and 20kVar.When 2 inverter control units in parallel
When inverter capacity is at 1:1, the sagging coefficient k of watt current is setp1=kp2=3e-3, the sagging coefficient k of reactive currentq1=kq2=
1e-3, reactive current integral coefficient kqc=0.5, preceding 1s use the existing sagging control of tradition, are switched to control method after 1s and change
Into the sagging control of electric current, the reactive power emulated is as shown in Figure 6, Figure 7.Vertical element is that First inverter is idle in figure
Simulation of SAR power image curve, dashed bars are second inverter reactive power simulation curve.
As can be seen that the sagging control of tradition is due to line impedance difference, reactive power is not accomplished to divide equally completely, be existed
Certain deviation.And the improved control strategy after 1s, then will become apparent from two inverter reactive powers is respectively 10kVar,
Power-sharing effect is preferable.
When two inverter capacity in parallel are at 3:2, institute's bringing onto load is still 50kW and 20kVar, the sagging system of watt current
Number kp13e-3, kp2=4.5e-3, the sagging coefficient k of reactive currentp1=1e-3, kp2=1/3e-3, institute's bringing onto load be still 50kW and
20kVar, preceding 1s use the existing sagging control of tradition, and control method is switched to the sagging control of improved electric current of the invention after 1s
System, reactive capability curve as shown in fig. 7, tradition it is sagging control there are still certain deviations, the control method of the utility model is idle
Power is accurately divided equally by 3:2, it was demonstrated that preferable effect is also achieved in the shunt chopper of different capabilities ratio.
Simulation results show the control method can obtain and more preferably control performance than traditional control method.This method is just
Really, reliably, good reference value is provided for engineer application.
Claims (5)
1. a kind of shunt chopper power-sharing device based on electric current droop characteristic, it is characterised in that: be based on the sagging spy of electric current
The shunt chopper power-sharing device of property is by D.C. regulated power supply (1), inversion control unit (13), load, central controller
(5) it constitutes；Central controller connects common bus, is connected with inversion control unit input terminal；N inversion in parallel on common bus
Control unit, wherein n >=2, and linear and nonlinear load (4) is connected on bus；Each inversion control unit is by one three
Phase inverter (2), line impedance (3), the sagging control module of improved electric current (12), voltage and current dual-loop controller (10),
SPWM pulse modulation module (11) composition；The DC side of three-phase inverter accesses DC power supply Vdc, the electricity of three-phase inverter output
Flow ia、ib、icThe sagging control module synthesized reference voltage of improved electric current is finely tuned by voltage and current dual-loop controller again
With SPWM pulse modulation module, SPWM wave is exported to control inverter；
The three-phase inverter (2) is made of three single-phase inversion circuits and LC filter two parts, single-phase inversion circuit by
The diode of IGBT power tube and inverse parallel between the EC grade of power tube IGBT is constituted, and LC filter contains filter inductance and filtering
Capacitor；
The sagging control module of improved electric current (12) is by the sagging control module of electric current (9), subtracter (7), integral controller
(8) it is formed with current average computing module (6), the electric current i of inverter outputa、ib、icThrough over-sampling and it is calculated idle
Electric current ipnWith watt current value iqn, central controller calculates current average by current average computing module, and will count
The current average of calculating is fed back to sampler；The reactive current average value i found outqavAnd n-th inverter reactive current is adopted
The reactive current value i of sample valueqnIt is poor to make in subtracter (7), adjusts voltage bias △ U using integral controller module, is sent into electricity
Flow down vertical control module；
The voltage and current is bicyclic to be made of outer voltage and inductive current outer ring, and outer voltage is using proportional plus integral control electricity
Road, inductive current inner ring use ratio control circuit.
2. the shunt chopper power-sharing device based on electric current droop characteristic as described in claim 1, it is characterised in that: institute
Three single-phase inversion circuits of three-phase inverter are stated by six IGBT power tube (S1, S2, S3, S4, S5, S6) and six diodes
(VD1, VD2, VD3,VD4,VD5, VD6) composition, diode (VD1, VD2, VD3,VD4,VD5, VD6) inverse parallel is in power tube IGBT
(S1, S2, S3, S4, S5, S6) EC grade between；
LC filter circuit is by filter inductance (L1, L2, L3) and three-phase filter capacitor (C1, C2, C3) composition, the use of three-phase filter capacitor
Star connection, the N-terminal of input voltage are filter capacitor midpoint.
3. the shunt chopper power-sharing device based on electric current droop characteristic as described in claim 1, it is characterised in that: institute
It states in voltage and current dual-loop controller (10), L1, C1 are the inductance and capacitor of filter, and the output of outer voltage is as inner ring
Given value, inner ring Setting signal are compared with the DC quantity after outputting inductance electric current rotation transformation, and error signal is through adjuster
Operation obtains the control signal of inner ring；Finally this control signal be sent into SPWM generator, compared with carrier modulation after generate
SPWM signal after driving circuit to inverse
The switching tube for becoming bridge is controlled.
4. the shunt chopper power-sharing device based on electric current droop characteristic as described in claim 1, it is characterised in that: institute
It states current average and calculates the central controller completion selected with computing function；
The subtracter (7) is made of operational amplifier A and resistance (R1~R4), wherein R3=R4；
The integral controller (8) is made of operational amplifier A and resistance (R5~R6), capacitor C.
5. the shunt chopper power-sharing device based on electric current droop characteristic as claimed in claim 4, it is characterised in that: institute
Stating the central controller with computing function is TMS320F28069 core board, and the operational amplifier A selects LM107 module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821730763.1U CN209046276U (en) | 2018-10-23 | 2018-10-23 | Shunt chopper power-sharing device based on electric current droop characteristic |
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| CN201821730763.1U CN209046276U (en) | 2018-10-23 | 2018-10-23 | Shunt chopper power-sharing device based on electric current droop characteristic |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066820A (en) * | 2018-10-23 | 2018-12-21 | 四川大学 | Shunt chopper power-sharing device and control method based on electric current droop characteristic |
| CN112242719A (en) * | 2019-07-17 | 2021-01-19 | 华北电力大学 | Inverter improved droop control method based on virtual synchronous machine technology |
| CN112928942A (en) * | 2021-02-25 | 2021-06-08 | 中车株洲电力机车有限公司 | Three-phase inverter circuit and control method thereof |
-
2018
- 2018-10-23 CN CN201821730763.1U patent/CN209046276U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066820A (en) * | 2018-10-23 | 2018-12-21 | 四川大学 | Shunt chopper power-sharing device and control method based on electric current droop characteristic |
| CN109066820B (en) * | 2018-10-23 | 2024-06-11 | 四川大学 | Parallel inverter power sharing device based on current droop characteristics and control method |
| CN112242719A (en) * | 2019-07-17 | 2021-01-19 | 华北电力大学 | Inverter improved droop control method based on virtual synchronous machine technology |
| CN112242719B (en) * | 2019-07-17 | 2022-04-15 | 华北电力大学 | Inverter improved droop control method based on virtual synchronous machine technology |
| CN112928942A (en) * | 2021-02-25 | 2021-06-08 | 中车株洲电力机车有限公司 | Three-phase inverter circuit and control method thereof |
| CN112928942B (en) * | 2021-02-25 | 2022-08-12 | 中车株洲电力机车有限公司 | Three-phase inverter circuit and control method thereof |
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