CN106026193B - A kind of micro-capacitance sensor multi-inverter parallel control system and its working method - Google Patents
A kind of micro-capacitance sensor multi-inverter parallel control system and its working method Download PDFInfo
- Publication number
- CN106026193B CN106026193B CN201610477749.4A CN201610477749A CN106026193B CN 106026193 B CN106026193 B CN 106026193B CN 201610477749 A CN201610477749 A CN 201610477749A CN 106026193 B CN106026193 B CN 106026193B
- Authority
- CN
- China
- Prior art keywords
- generation unit
- distributed generation
- voltage
- controller
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 claims description 21
- 238000004364 calculation method Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 238000007665 sagging Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 235000013399 edible fruits Nutrition 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of micro-capacitance sensor multi-inverter parallel control system and its working methods, it can operate in simultaneously under isolated island and grid-connected both of which, transition between two kinds of operational modes does not need the switching of corresponding control method, and system reliability is high, dynamic property enhances.It joined the differential control to active power in power control, accelerate the active power dynamic responding speed of system；There is the integration control to power system reactive power meanwhile under the mode of being incorporated into the power networks, in power control, so that the power factor of the points of common connection of each distributed generation unit and power grid is controlled；No particular/special requirement whether identical to the rated capacity of each distributed generation unit has stronger adaptability and preferable application prospect.
Description
Technical field
The present invention relates to a kind of micro-capacitance sensor multi-inverter parallel control system and its working method, belong to distributed power generation and
Intelligent power grid technology field.
Background technique
In order to solve the technical problem of distributed generation resource access power grid, electric system correlation scholars propose micro-capacitance sensor
Concept.Micro-capacitance sensor is made up of decline source, energy conversion device and local load of distribution the network interconnection, can be realized self
The Partial discharge system of control, protection and management.In micro-capacitance sensor, most of distributions source that declines passes through inverter interface and accesses
Ac bus, so as to form a kind of multi-inverter parallel running environment.
There are isolated islands and grid-connected two kinds of operational modes for micro-capacitance sensor.Under isolated operation mode, inverter is by adjusting voltage
Amplitude and frequency obtain the power-sharing control between each distributed generation unit in turn；It is incorporated into the power networks under mode, is keeping lonely
On the basis of all control functions of island operational mode, power flow direction at each distributed generation unit points of common connection is mainly realized
It is accurate to adjust.When micro-capacitance sensor according to circumstances needs isolated operation or external electrical network to break down, should disconnect rapidly and power grid
Connection, is transferred to isolated operation mode；When external electrical network service restoration is normal, or according to circumstances micro-grid connection is needed to run
When, the micro-capacitance sensor in isolated operation mode is connected to public electric wire net again.Currently, being needed in both of which conversion process
The corresponding operation control strategy of switching, the stationarity of handoff procedure need further research to improve.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of micro-capacitance sensor multi-inverter parallel control system and its work side
Method.
Technical scheme is as follows:
A kind of micro-capacitance sensor multi-inverter parallel control system and its working method, it is how inverse which is suitable for micro-capacitance sensor
Become device parallel control system, the micro-capacitance sensor multi-inverter parallel control system includes the distributed generation unit of N number of parallel connection, hands over
Flow bus, load, low bandwidth communication, grid-connected switch, transformer, power grid；The distributed generation unit is by micro- source, H bridge inversion
Circuit, LC filter, switch are sequentially connected with composition, and each distributed generation unit further includes its respective controller；It is described N number of
Distributed generation unit in parallel is connect by its respective switch with the ac bus, and the load is connected to the exchange
On bus；The grid-connected switch is connect with the ac bus, while being sequentially connected with transformer, power grid；The low bandwidth is logical
Letter connects together the controller 1 in distributed generation unit 1 with the controller in remaining N-1 distributed generation unit.
In the distributed generation unit 1, the acquisition input quantity of the controller 1 has: network voltage vg, grid-connected current
ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1, distributed generation unit 1 export electric current io1, it is distributed
The H-bridge inverter circuit of generator unit 1 exports electric current i1, the output quantity of the controller 1 has: the H bridge of distributed generation unit 1 is inverse
Power transformation road duty cycle signals S1, grid-connected reactive power Qg.For remaining the N-1 distributed hair in addition to distributed generation unit 1
For electric unit controller, acquires input quantity and output quantity is different from the controller 1, but this N-1 distributed power generation list
Cell controller acquires input quantity and output quantity is all the same, in a distributed manner for generator unit i, 2≤i≤N, controller i acquisition
Input quantity has: ac bus voltage vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi、
The H-bridge inverter circuit of distributed generation unit i exports electric current ii, grid-connected reactive power Qg, output quantity has: distributed generation unit i
H-bridge inverter circuit duty cycle signals Si.Grid-connected reactive power QgIt is exported by the controller 1 and is transmitted through the low bandwidth communication
Into remaining N-1 distributed generation unit controller.
The specific works method of micro-capacitance sensor multi-inverter parallel control system of the present invention includes:
(1) initial in the operation of micro-capacitance sensor multi-inverter parallel control system, it switchs in distributed generation unit 1 and closes first
It closes, distributed generation unit 1 is connected to ac bus；In each sampling period starting point of controller 1, network voltage is acquired
vg, grid-connected current ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1, distributed generation unit 1 export electric current
io1, distributed generation unit 1 H-bridge inverter circuit export electric current i1, and through operation and processing, obtain distributed generation unit 1
H-bridge inverter circuit duty cycle signals S1, grid-connected reactive power Qg；S1Drive H-bridge inverter circuit work, distributed generation unit 1
It is able to independent operating；
(2) distributed generation unit i is closed the switch, and distributed generation unit i is connected to ac bus；Controller i is adopted
Collect ac bus voltage vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi, distributed hair
The H-bridge inverter circuit of electric unit i exports electric current ii, input grid-connected reactive power Qg, through operation and processing, obtain distributed power generation
The H-bridge inverter circuit duty cycle signals S of unit ii；SiDrive H-bridge inverter circuit work, distributed generation unit i and distributed hair
The isolated operation in parallel of electric unit 1；
(3) grid-connected synch command is issued to distributed generation unit controllers all in system, so that their own electricity
Press reference value all identical, then no matter whether the rated capacity of each distributed generation unit is identical, and respective output voltage becomes
In identical；
(4) grid-connected to close the switch, all distributed generation units issue electric energy in addition to for load supplying, and dump energy is simultaneously
Enter AC network, this is the mode that is incorporated into the power networks.
Preferred according to the present invention, in the step (1), the H bridge that 1 operation of controller obtains distributed generation unit 1 is inverse
Power transformation road duty cycle signals S1Specific steps include:
A, controller 1 is according to network voltage vg, grid-connected current igGrid-connected reactive power Q is calculatedg, according to ac bus
Voltage vL, distributed generation unit 1 export electric current io11 active power of output P of distributed generation unit is calculated1With output nothing
Function power Q1；
B, by grid-connected reactive power Qg, 1 active power of output P of distributed generation unit1With output reactive power Q1It calculates
To angular frequency variable quantityWith voltage magnitude variable quantity
In formula (I),For the rated generation amount of distributed generation unit 1, kd1、ki1Respectively controller 1 power control
Differential coefficient and integral coefficient, m1And n1For the sagging gain of controller 1, t is time variable；
C, to network voltage vgSurvey calculation obtains 1 network voltage angular frequency of controllerGrid voltage amplitudePower grid
Voltage phase angle θg；
D, by 1 network voltage angular frequency of controllerGrid voltage amplitudeElectric network voltage phase angle θg, angular frequency variation
AmountVoltage magnitude variable quantitySynthesized reference voltage composite valueCalculation formula are as follows:
E, reference voltage composite valueIt subtracts distributed generation unit 1 and exports electric current io1With the product of virtual impedance, obtain
To voltage reference value vref1；
F, 1 output voltage v of distributed generation unito1, voltage reference value vref1, distributed generation unit 1 export electric current io1
It is controlled to adjust through voltage, obtains reference current
G, reference current1 output voltage v of distributed generation unito1, the H-bridge inverter circuit of distributed generation unit 1 it is defeated
Electric current i out1It is adjusted through current control, obtains modulation wave signal D1；Modulation wave signal D1PWM modulation is carried out with triangular carrier, is obtained
The H-bridge inverter circuit duty cycle signals S of distributed generation unit 11。
Preferred according to the present invention, in the step (2), the H bridge that controller i operation obtains distributed generation unit i is inverse
Power transformation road duty cycle signals SiSpecific steps include:
H, controller i is according to ac bus voltage vL, distributed generation unit i export electric current ioiDistributed hair is calculated
Electric unit i active power of output PiWith output reactive power Qi；
I, by distributed generation unit i active power of output PiWith output reactive power Qi, grid-connected reactive power QgIt calculates
To controller i angular frequency variable quantityWith voltage magnitude variable quantity
In formula (III),For the rated generation amount of distributed generation unit i, kdi、kiiRespectively controller i power control
Differential coefficient and integral coefficient, miAnd niFor the sagging gain of controller i, t is time variable；
J, to ac bus voltage vLSurvey calculation obtains controller i load voltage angular frequencyLoad voltage amplitude
Load voltage phase angle θL；
K, by controller i angular frequency variable quantityVoltage magnitude variable quantityLoad voltage angular frequencyLoad voltage
AmplitudeLoad voltage phase angle θLSynthetic controller i reference voltage composite valueCalculation formula are as follows:
L, controller i reference voltage composite valueSubtract distributed generation unit i output electric current ioiWith virtual impedance
Product obtains controller i voltage reference value vrefi；
M, distributed generation unit i output voltage voi, controller i voltage reference value vrefi, distributed generation unit i output
Electric current ioiIt is controlled to adjust through voltage, obtains reference current
N, reference currentDistributed generation unit i output voltage voi, the H-bridge inverter circuit of distributed generation unit i it is defeated
Electric current i outiIt is adjusted through current control, obtains modulation wave signal Di；Modulation wave signal DiPWM modulation is carried out with triangular carrier, is obtained
The H-bridge inverter circuit duty cycle signals S of distributed generation unit ii。
It is preferred according to the present invention, in the step (3), distributed generation unit controllers all in system are issued simultaneously
Net synch command, so that their own voltage reference value is all identical, final all distributed generation unit output voltages become
In identical, specific implementation method are as follows:
O, grid-connected synch command issues, angular frequency variation in 1 slow adjustable type (I) of controller in distributed generation unit 1
AmountWith voltage magnitude variable quantitySo that the two goes to zero, then reference voltage composite value in formula (II)It tapers to
With network voltage vgIt is identical；
P, 1 reference voltage composite value of distributed generation unitSo that its output voltage changes, ac bus is electric for variation
Press vLIt changes correspondingly；Meanwhile controller i angular frequency variable quantity in the slow adjustable type of controller i (III) in distributed generation unit iWith voltage magnitude variable quantitySo that the two goes to zero, then controller i reference voltage composite value in formula (IV)With friendship
Flow busbar voltage vLVariation and change；Finally, all distributed generation unit output voltages are all the same in system.
The invention has the benefit that
1, micro-capacitance sensor multi-inverter parallel control system can operate in simultaneously under isolated island and grid-connected both of which, two kinds of operations
Transition between mode does not need the switching of corresponding control method, and system reliability is high, dynamic property enhances；
2, the differential of active power is controlled in power control, accelerates the active power dynamic responding speed of system；
3, it is incorporated into the power networks under mode, there is the integration control to power system reactive power in power control, so that each distribution
The power factor of the points of common connection of generator unit and power grid is able to strict control；
4, under conditions of distributed generation unit rated capacity is inconsistent, the present invention can still obtain ideal operation effect
Fruit.
Detailed description of the invention
Fig. 1 is micro-capacitance sensor multi-inverter parallel control system architecture schematic diagram of the present invention；
In Fig. 1, N >=2 and 2≤i≤N, similarly hereinafter；
Fig. 2 is the flow diagram of 1 working method of controller of distributed generation unit 1 of the present invention；
Fig. 3 is the flow diagram of the controller i working method of distributed generation unit i of the present invention；
Fig. 4 is using simulation model output electric current effect picture of the invention；
Fig. 5 is using output Current amplifier is imitated when two distributed generation unit parallel connection isolated operations under simulated conditions of the present invention
Fruit figure；
Fig. 6 is output Current amplifier effect when being incorporated into the power networks using two distributed generation unit parallel connections under simulated conditions of the present invention
Fruit figure.
Specific embodiment
The invention is further explained in the following combination with the attached drawings of the specification.
Micro-capacitance sensor multi-inverter parallel control system of the present invention is as shown in Figure 1.The micro-capacitance sensor multi-inverter parallel control
System includes distributed generation unit, ac bus, load, low bandwidth communication, the grid-connected switch, transformer, electricity of N number of parallel connection
Net；The distributed generation unit is sequentially connected with and is formed by micro- source, H-bridge inverter circuit, LC filter, switch, each distribution
Generator unit further includes its respective controller；The distributed generation unit of N number of parallel connection passes through its respective switch and institute
Ac bus connection is stated, the load is connected on the ac bus；The grid-connected switch is connect with the ac bus, together
When be sequentially connected with transformer, power grid；The low bandwidth communication is a by controller 1 and remaining N-1 in distributed generation unit 1
Controller in distributed generation unit connects together.
In the distributed generation unit 1, the acquisition input quantity of the controller 1 has: network voltage vg, grid-connected current
ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1, distributed generation unit 1 export electric current io1, it is distributed
The H-bridge inverter circuit of generator unit 1 exports electric current i1, the output quantity of the controller 1 has: the H bridge of distributed generation unit 1 is inverse
Power transformation road duty cycle signals S1, grid-connected reactive power Qg.For remaining the N-1 distributed hair in addition to distributed generation unit 1
For electric unit controller, acquires input quantity and output quantity is different from the controller 1, but this N-1 distributed power generation list
Cell controller acquires input quantity and output quantity is all the same, in a distributed manner for generator unit i, 2≤i≤N, controller i acquisition
Input quantity has: ac bus voltage vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi、
The H-bridge inverter circuit of distributed generation unit i exports electric current ii, grid-connected reactive power Qg, output quantity has: distributed generation unit i
H-bridge inverter circuit duty cycle signals Si.Grid-connected reactive power QgIt is exported by the controller 1 and is transmitted through the low bandwidth communication
Into remaining N-1 distributed generation unit controller.
The specific works method of micro-capacitance sensor multi-inverter parallel control system of the present invention includes:
(1) initial in the operation of micro-capacitance sensor multi-inverter parallel control system, it switchs in distributed generation unit 1 and closes first
It closes, distributed generation unit 1 is connected to ac bus；In each sampling period starting point of controller 1, network voltage is acquired
vg, grid-connected current ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1, distributed generation unit 1 export electric current
io1, distributed generation unit 1 H-bridge inverter circuit export electric current i1, and through operation and processing, obtain distributed generation unit 1
H-bridge inverter circuit duty cycle signals S1, grid-connected reactive power Qg；S1Drive H-bridge inverter circuit work, distributed generation unit 1
It is able to independent operating；
(2) distributed generation unit i is closed the switch, and distributed generation unit i is connected to ac bus；Controller i is adopted
Collect ac bus voltage vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi, distributed hair
The H-bridge inverter circuit of electric unit i exports electric current ii, input grid-connected reactive power Qg, through operation and processing, obtain distributed power generation
The H-bridge inverter circuit duty cycle signals S of unit ii；SiDrive H-bridge inverter circuit work, distributed generation unit i and distributed hair
The isolated operation in parallel of electric unit 1；
(3) grid-connected synch command is issued to distributed generation unit controllers all in system, so that their own electricity
Press reference value all identical, then no matter whether the rated capacity of each distributed generation unit is identical, and respective output voltage becomes
In identical；
(4) grid-connected to close the switch, all distributed generation units issue electric energy in addition to for load supplying, and dump energy is simultaneously
Enter AC network, this is the mode that is incorporated into the power networks.
Micro-capacitance sensor multi-inverter parallel control system working method of the present invention is as shown in Figures 2 and 3, wherein Fig. 2 is this hair
The flow diagram of 1 working method of controller of bright distributed generation unit 1, Fig. 3 are the control of distributed generation unit i of the present invention
The flow diagram of device i working method processed.
In the working method step (1), 1 operation of controller obtains the H-bridge inverter circuit duty of distributed generation unit 1
Than signal S1Specific implementation step include:
A, controller 1 is according to network voltage vg, grid-connected current igGrid-connected reactive power Q is calculatedg, according to ac bus
Voltage vL, distributed generation unit 1 export electric current io11 active power of output P of distributed generation unit is calculated1With output nothing
Function power Q1；
B, by grid-connected reactive power Qg, 1 active power of output P of distributed generation unit1With output reactive power Q1It calculates
To angular frequency variable quantityWith voltage magnitude variable quantity
In formula (I),For the rated generation amount of distributed generation unit 1, kd1、ki1Respectively controller 1 power control
Differential coefficient and integral coefficient, m1And n1For the sagging gain of controller 1, t is time variable；
C, to network voltage vgSurvey calculation obtains 1 network voltage angular frequency of controllerGrid voltage amplitudePower grid
Voltage phase angle θg；
D, by 1 network voltage angular frequency of controllerGrid voltage amplitudeElectric network voltage phase angle θg, angular frequency variation
AmountVoltage magnitude variable quantitySynthesized reference voltage composite valueCalculation formula are as follows:
E, reference voltage composite valueIt subtracts distributed generation unit 1 and exports electric current io1With the product of virtual impedance, obtain
To voltage reference value vref1；
F, 1 output voltage v of distributed generation unito1, voltage reference value vref1, distributed generation unit 1 export electric current io1
It is controlled to adjust through voltage, obtains reference current
G, reference current1 output voltage v of distributed generation unito1, the H-bridge inverter circuit of distributed generation unit 1 it is defeated
Electric current i out1It is adjusted through current control, obtains modulation wave signal D1；Modulation wave signal D1PWM modulation is carried out with triangular carrier, is obtained
The H-bridge inverter circuit duty cycle signals S of distributed generation unit 11。
In the working method step (2), controller i operation obtains the H-bridge inverter circuit duty of distributed generation unit i
Than signal SiSpecific implementation step include:
H, controller i is according to ac bus voltage vL, distributed generation unit i export electric current ioiDistributed hair is calculated
Electric unit i active power of output PiWith output reactive power Qi；
I, by distributed generation unit i active power of output PiWith output reactive power Qi, grid-connected reactive power QgIt calculates
To controller i angular frequency variable quantityWith voltage magnitude variable quantity
In formula (III),For the rated generation amount of distributed generation unit i, kdi、kiiRespectively controller i power control
Differential coefficient and integral coefficient, miAnd niFor the sagging gain of controller i, t is time variable；
J, to ac bus voltage vLSurvey calculation obtains controller i load voltage angular frequencyLoad voltage amplitude
Load voltage phase angle θL；
K, by controller i angular frequency variable quantityVoltage magnitude variable quantityLoad voltage angular frequencyLoad voltage
AmplitudeLoad voltage phase angle θLSynthetic controller i reference voltage composite valueCalculation formula are as follows:
L, controller i reference voltage composite valueSubtract distributed generation unit i output electric current ioiWith virtual impedance
Product obtains controller i voltage reference value vrefi；
M, distributed generation unit i output voltage voi, controller i voltage reference value vrefi, distributed generation unit i output
Electric current ioiIt is controlled to adjust through voltage, obtains reference current
N, reference currentDistributed generation unit i output voltage voi, the H-bridge inverter circuit of distributed generation unit i it is defeated
Electric current i outiIt is adjusted through current control, obtains modulation wave signal Di；Modulation wave signal DiPWM modulation is carried out with triangular carrier, is obtained
The H-bridge inverter circuit duty cycle signals S of distributed generation unit ii。
In the working method step (3), grid-connected synchronous life is issued to distributed generation unit controllers all in system
It enables, so that their own voltage reference value is all identical, final all distributed generation unit output voltages tend to be identical, have
Body methods && steps of implementation are as follows:
O, grid-connected synch command issues, angular frequency variation in 1 slow adjustable type (I) of controller in distributed generation unit 1
AmountWith voltage magnitude variable quantitySo that the two goes to zero, then reference voltage composite value in formula (II)It tapers to
With network voltage vgIt is identical；
P, 1 reference voltage composite value of distributed generation unitSo that its output voltage changes, ac bus is electric for variation
Press vLIt changes correspondingly；Meanwhile controller i angular frequency variable quantity in the slow adjustable type of controller i (III) in distributed generation unit iWith voltage magnitude variable quantitySo that the two goes to zero, then controller i reference voltage composite value in formula (IV)With friendship
Flow busbar voltage vLVariation and change；Finally, all distributed generation unit output voltages are all the same in system.
Utilize the implementation result of the invention of the micro-capacitance sensor Validation of Simulation Models containing 2 distributed generation units: power grid electricity
Pressure amplitude value virtual value is set as 230V, and the rated capacity of distributed generation unit 1 is 2kVA, the specified appearance of distributed generation unit 2
Amount is 1kVA, and load rating power is 176W, and the rated generation amount of distributed generation unit 1 is 800W, distributed generation unit 2
Rated generation amount be 400W.Fig. 4 show simulation data electric current effect picture, and the independent fortune of distributed generation unit 1 is divided into figure
Row, the isolated operation of distributed generation unit 1 and 2, it is grid-connected it is synchronous, be incorporated into the power networks four-stage.0~3s, distributed generation unit 1
Independent operating is load supplying；3~5s, distributed generation unit 2 are put into, isolated operation in parallel with distributed generation unit 1, altogether
It is all load supplying, since two distributed generation unit rated capacity ratio are 2:1, so the ratio between their output electric current is also 2:
1；5s starts grid-connected synchronization, enters grid-connected synchronous phase afterwards, their output voltage is identical at this time, so export electric current also phase
Together；Grid-connected switch investment, the parallel connection of distributed generation unit 1 and 2 are incorporated into the power networks when 7s, and two distributed generation units issue electric energy and remove
Other than load supplying, dump energy is incorporated to AC network.Fig. 5 show imitative when two distributed generation unit parallel connection isolated operations
True output Current amplifier figure, Fig. 6 show simulation data Current amplifier figure when two distributed generation unit parallel connections are incorporated into the power networks.Two
Figure has all indicated distributed generation unit 1 and has exported electric current, the output electric current of distributed generation unit 2 and grid-connected current, wherein figure
Grid-connected current is zero in 5.As can be seen that the present invention achieves preferable implementation result.
Claims (1)
1. a kind of working method of micro-capacitance sensor multi-inverter parallel control system, which is characterized in that the micro-capacitance sensor multi-inverter
Parallel control system includes distributed generation unit, ac bus, load, low bandwidth communication, the grid-connected switch, change of N number of parallel connection
Depressor, power grid；The distributed generation unit is sequentially connected with and is formed by micro- source, H-bridge inverter circuit, LC filter, switch, each
Distributed generation unit further includes its respective controller；The distributed generation unit of N number of parallel connection respective is opened by its
Pass is connect with the ac bus, and the load is connected on the ac bus；The grid-connected switch and the ac bus
Connection, while being sequentially connected with transformer, power grid；The low bandwidth communication by distributed generation unit 1 controller 1 and its
Controller in remaining N-1 distributed generation unit connects together；In the distributed generation unit 1, the controller 1
Acquisition input quantity have: network voltage vg, grid-connected current ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1、
Distributed generation unit 1 exports electric current io1, distributed generation unit 1 H-bridge inverter circuit export electric current i1, the controller 1
Output quantity have: the H-bridge inverter circuit duty cycle signals S of distributed generation unit 11, grid-connected reactive power Qg；Except distribution is sent out
The controller input quantity collected and output quantity and the control of remaining N-1 distributed generation unit other than electric unit 1
Device 1 is different, and the controller input quantity collected and output quantity of remaining described N-1 distributed generation unit are all the same；Distribution
Formula generator unit i, wherein the controller i acquisition input quantity of 2≤i≤N, the distributed generation unit i have: ac bus voltage
vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi, the H bridge of distributed generation unit i it is inverse
Become circuit output current ii, grid-connected reactive power Qg, output quantity has: the H-bridge inverter circuit duty ratio letter of distributed generation unit i
Number Si；Grid-connected reactive power QgIt is exported by the controller 1 and is transmitted to remaining N-1 distributed power generation through the low bandwidth communication
In cell controller；
The working method of the micro-capacitance sensor multi-inverter parallel control system the following steps are included:
(1) initial in the operation of micro-capacitance sensor multi-inverter parallel control system, it switchs in distributed generation unit 1 and is closed first, it will
Distributed generation unit 1 is connected to ac bus；In each sampling period starting point of controller 1, network voltage v is acquiredg, simultaneously
Net electric current ig, ac bus voltage vL, 1 output voltage v of distributed generation unito1, distributed generation unit 1 export electric current io1、
The H-bridge inverter circuit of distributed generation unit 1 exports electric current i1, and through operation and processing, obtain the H of distributed generation unit 1
Bridge inverter circuit duty cycle signals S1, grid-connected reactive power Qg；S1H-bridge inverter circuit work is driven, distributed generation unit 1 obtains
With independent operating；1 operation of controller obtains the H-bridge inverter circuit duty cycle signals S of distributed generation unit 11Specific steps
Include:
A, controller 1 is according to network voltage vg, grid-connected current igGrid-connected reactive power Q is calculatedg, according to ac bus voltage
vL, distributed generation unit 1 export electric current io11 active power of output P of distributed generation unit is calculated1With the idle function of output
Rate Q1；
B, by grid-connected reactive power Qg, 1 active power of output P of distributed generation unit1With output reactive power Q1Angle is calculated
Frequency variationWith voltage magnitude variable quantity
In formula (I),For the rated generation amount of distributed generation unit 1, kd1、ki1The respectively differential of 1 power control of controller
Coefficient and integral coefficient, m1And n1For the sagging gain of controller 1, t is time variable；
C, to network voltage vgSurvey calculation obtains 1 network voltage angular frequency of controllerGrid voltage amplitudeNetwork voltage
Phase angle θg；
D, 1 network voltage angular frequency of controllerGrid voltage amplitudeElectric network voltage phase angle θg, angular frequency variable quantity
Voltage magnitude variable quantitySynthesized reference voltage composite valueCalculation formula are as follows:
E, reference voltage composite valueIt subtracts distributed generation unit 1 and exports electric current io1With the product of virtual impedance, electricity is obtained
Press reference value vref1；
F, 1 output voltage v of distributed generation unito1, voltage reference value vref1, distributed generation unit 1 export electric current io1Through electricity
Pressure controls to adjust, and obtains reference current
G, reference current1 output voltage v of distributed generation unito1, distributed generation unit 1 H-bridge inverter circuit export electricity
Flow i1It is adjusted through current control, obtains modulation wave signal D1；Modulation wave signal D1PWM modulation is carried out with triangular carrier, is distributed
The H-bridge inverter circuit duty cycle signals S of formula generator unit 11；
(2) distributed generation unit i is closed the switch, and distributed generation unit i is connected to ac bus；Controller i acquisition is handed over
Flow busbar voltage vL, distributed generation unit i output voltage voi, distributed generation unit i export electric current ioi, distributed power generation list
The H-bridge inverter circuit of first i exports electric current ii, input grid-connected reactive power Qg, through operation and processing, obtain distributed generation unit i
H-bridge inverter circuit duty cycle signals Si；SiDrive H-bridge inverter circuit work, distributed generation unit i and distributed power generation list
The isolated operation in parallel of member 1；Controller i operation obtains the H-bridge inverter circuit duty cycle signals S of distributed generation unit iiIt is specific
Step includes:
H, controller i is according to ac bus voltage vL, distributed generation unit i export electric current ioiDistributed power generation list is calculated
First i active power of output PiWith output reactive power Qi；
I, by distributed generation unit i active power of output PiWith output reactive power Qi, grid-connected reactive power QgControl is calculated
Device i angular frequency variable quantity processedWith voltage magnitude variable quantity
In formula (III),For the rated generation amount of distributed generation unit i, kdi、kiiThe respectively differential of controller i power control
Coefficient and integral coefficient, miAnd niFor the sagging gain of controller i, t is time variable；
J, to ac bus voltage vLSurvey calculation obtains controller i load voltage angular frequencyLoad voltage amplitudeLoad
Voltage phase angle θL；
K, by controller i angular frequency variable quantityVoltage magnitude variable quantityLoad voltage angular frequencyLoad voltage amplitudeLoad voltage phase angle θLSynthetic controller i reference voltage composite valueCalculation formula are as follows:
L, controller i reference voltage composite valueSubtract distributed generation unit i output electric current ioiWith the product of virtual impedance,
Obtain controller i voltage reference value vrefi；
M, distributed generation unit i output voltage voi, controller i voltage reference value vrefi, distributed generation unit i export electric current
ioiIt is controlled to adjust through voltage, obtains reference current
N, reference currentDistributed generation unit i output voltage voi, distributed generation unit i H-bridge inverter circuit export electricity
Flow iiIt is adjusted through current control, obtains modulation wave signal Di；Modulation wave signal DiPWM modulation is carried out with triangular carrier, is distributed
The H-bridge inverter circuit duty cycle signals S of formula generator unit ii；
(3) grid-connected synch command is issued to distributed generation unit controllers all in system, so that their own voltage is joined
Examine that value is all identical, then no matter whether the rated capacity of each distributed generation unit is identical, and respective output voltage tends to phase
Together；Specific implementation method are as follows:
O, grid-connected synch command issues, angular frequency variable quantity in 1 slow adjustable type (I) of controller in distributed generation unit 1
With voltage magnitude variable quantitySo that the two goes to zero, then reference voltage composite value in formula (II)It tapers to and electricity
Net voltage vgIt is identical；
P, 1 reference voltage composite value of distributed generation unitVariation is so that the change of its output voltage, ac bus voltage vLWith
Change；Meanwhile controller i angular frequency variable quantity in the slow adjustable type of controller i (III) in distributed generation unit iAnd electricity
Pressure amplitude value variable quantitySo that the two goes to zero, then controller i reference voltage composite value in formula (IV)With ac bus
Voltage vLVariation and change；Finally, all distributed generation unit output voltages are all the same in system；
(4) grid-connected to close the switch, all distributed generation units issue electric energy in addition to for load supplying, and dump energy is incorporated to friendship
Galvanic electricity net, this is the mode that is incorporated into the power networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610477749.4A CN106026193B8 (en) | 2016-06-26 | 2016-06-26 | A kind of micro-capacitance sensor multi-inverter parallel control system and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610477749.4A CN106026193B8 (en) | 2016-06-26 | 2016-06-26 | A kind of micro-capacitance sensor multi-inverter parallel control system and its working method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| CN106026193A CN106026193A (en) | 2016-10-12 |
| CN106026193B true CN106026193B (en) | 2019-01-04 |
| CN106026193B8 CN106026193B8 (en) | 2019-04-12 |
Family
ID=57085272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610477749.4A Active CN106026193B8 (en) | 2016-06-26 | 2016-06-26 | A kind of micro-capacitance sensor multi-inverter parallel control system and its working method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106026193B8 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732978B (en) * | 2017-09-23 | 2021-02-19 | 天津大学 | Inverter system based on virtual synchronous generator improved power distribution strategy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368620A (en) * | 2011-10-28 | 2012-03-07 | 浙江大学 | Wind-energy/ solar-energy/ storage/ ocean-current-energy new-energy isolated network stabilization operation integration control system and method thereof |
| CN104734193A (en) * | 2015-04-13 | 2015-06-24 | 湖南大学 | Distributed-generation three-phase inverter smooth switch control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515006A (en) * | 2016-01-20 | 2016-04-20 | 上海电力学院 | Micro-grid multi-master-slave mixed control method based on improved droop control |
-
2016
- 2016-06-26 CN CN201610477749.4A patent/CN106026193B8/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368620A (en) * | 2011-10-28 | 2012-03-07 | 浙江大学 | Wind-energy/ solar-energy/ storage/ ocean-current-energy new-energy isolated network stabilization operation integration control system and method thereof |
| CN104734193A (en) * | 2015-04-13 | 2015-06-24 | 湖南大学 | Distributed-generation three-phase inverter smooth switch control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106026193A (en) | 2016-10-12 |
| CN106026193B8 (en) | 2019-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103795080B (en) | A kind of combination method of MMC type HVDC light system | |
| CN107591834A (en) | Based on the group string data of virtual synchronous machine without energy storage photovoltaic generating system control method | |
| CN201846091U (en) | Full numerical control three-phrase solar photovoltaic grid-connected inverter | |
| CN102621501B (en) | System and method for testing temperature rise and efficiency under rated power of high-power photovoltaic inverter | |
| CN107732978A (en) | A kind of inverter system that power distribution strategies are improved based on virtual synchronous generator | |
| CN105162350B (en) | The three-phase micro inverter and its control method of a kind of wide loading range of high efficiency | |
| CN107221960A (en) | A kind of combining inverter low voltage traversing control method based on control mode switch | |
| CN110086200B (en) | Coordination control method for hybrid series-parallel micro-grid in island mode | |
| CN107230983A (en) | A kind of electric power spring application system and its control method based on Power Control | |
| CN107086600A (en) | A kind of solar energy power generating three phase full bridge grid-connected inverting system | |
| CN104734193A (en) | Distributed-generation three-phase inverter smooth switch control method | |
| CN106300435A (en) | Isolated microgrid single-phase multi-inverter parallel system and distributed control method thereof | |
| CN102969920A (en) | Bidirectional inverter with dual operating modes | |
| CN103904654A (en) | Combined three-phase inverter circuit parallel operation control method | |
| CN108631363B (en) | Inverter photovoltaic virtual synchronous control method based on master slave control | |
| CN103259282A (en) | Soft cut-in method for non-isolated type photovoltaic grid-connected inverter and isolated type photovoltaic grid-connected inverter | |
| CN102882225B (en) | Based on the user side distributed power source plug and play power-supply management system of photovoltaic system | |
| CN207251220U (en) | A kind of solar energy power generating three phase full bridge grid-connected inverting system | |
| CN106130062A (en) | A kind of two-stage type grid-connected photovoltaic system and intermediate dc side voltage stabilizing method | |
| CN106026193B (en) | A kind of micro-capacitance sensor multi-inverter parallel control system and its working method | |
| CN112994100B (en) | Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal | |
| CN104967345B (en) | The system that alternating current is provided | |
| CN104319786A (en) | SVG (Static Var Generator) DC ice melting device control system | |
| CN104734181A (en) | Photovoltaic grid-connected system | |
| CN106816889B (en) | Gird-connected inverter power decoupled method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Qinghai Inventor after: Zeng Xiangsong Inventor after: Fan Yuhui Inventor after: Tan Yumei Inventor before: Zhang Qinghai |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20181220 Address after: 710000 Yicuiyuan-Xi'an (Phase II) Building 1, Unit 5, Floor 10503, East of Tang Yannan Road, Xi'an High-tech Zone, Xi'an City, Shaanxi Province Applicant after: XI'AN YOUBIHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: No. 4 Li Min Xi Road, Liaocheng, Shandong Province Applicant before: Zhang Qinghai |
|
| TA01 | Transfer of patent application right | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190107 Address after: 710075 No. 9, No. 2 Biyuan Road, Xi'an High-tech Zone, Shaanxi Province Patentee after: SHAANXI XINTONG INTELLIGENT TECHNOLOGY CO.,LTD. Address before: 710000 Yicuiyuan-Xi'an (Phase II) Building 1, Unit 5, Floor 10503, East of Tang Yannan Road, Xi'an High-tech Zone, Xi'an City, Shaanxi Province Patentee before: XI'AN YOUBIHUI ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CI03 | Correction of invention patent | ||
| CI03 | Correction of invention patent |
Correction item: Patentee|Address|Patent agency|Agent Correct: XI'AN YOUBIHUI ELECTRONIC TECHNOLOGY Co.,Ltd.|Unit 1, Unit 5, Floor 10503, Building 1, Yicuiyuan-Xi'an (Phase 2), East of Tang Yannan Road, Xi'an High-tech Zone, Shaanxi Province|Xi'an East Honglijing Patent Agency Partnership|Li Dongjing False: Zhang Qinghai|No. 4 Limin West Road, Liaocheng City, Shandong Province|Hangzhou Jubang Intellectual Property Agency Ltd.|Wang Jie Number: 01-02 Page: The title page Volume: 35 Correction item: Patentee|Address|Patent agency|Agent Correct: XI'AN YOUBIHUI ELECTRONIC TECHNOLOGY Co.,Ltd.|Unit 1, Unit 5, Floor 10503, Building 1, Yicuiyuan-Xi'an (Phase 2), East of Tang Yannan Road, Xi'an High-tech Zone, Shaanxi Province|Xi'an East Honglijing Patent Agency Partnership|Li Dongjing False: Zhang Qinghai|No. 4 Limin West Road, Liaocheng City, Shandong Province|Hangzhou Jubang Intellectual Property Agency Ltd.|Wang Jie Number: 01-02 Volume: 35 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190416 Address after: Room 1002, 1st floor, No. 9 Office Building, Biyuan No. 2 Road, Xi'an High-tech Zone, Shaanxi Province, 710117 Patentee after: SHAANXI XINTONG YUTONG INTELLIGENT TECHNOLOGY CO.,LTD. Address before: 710075 No. 9, No. 2 Biyuan Road, Xi'an High-tech Zone, Shaanxi Province Patentee before: SHAANXI XINTONG INTELLIGENT TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221026 Address after: 710,117 No. 9, Biyuan Second Road, High tech Zone, Xi'an, Shaanxi Patentee after: SHAANXI XINTONG INTELLIGENT TECHNOLOGY CO.,LTD. Address before: Room 1002, 1st floor, No. 9 Office Building, Biyuan No. 2 Road, Xi'an High-tech Zone, Shaanxi Province, 710117 Patentee before: SHAANXI XINTONG YUTONG INTELLIGENT TECHNOLOGY CO.,LTD. |