CN105610182B - A kind of the tandem type microgrid structure and its Poewr control method of isolated operation - Google Patents
A kind of the tandem type microgrid structure and its Poewr control method of isolated operation Download PDFInfo
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- CN105610182B CN105610182B CN201510786185.8A CN201510786185A CN105610182B CN 105610182 B CN105610182 B CN 105610182B CN 201510786185 A CN201510786185 A CN 201510786185A CN 105610182 B CN105610182 B CN 105610182B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 125000002619 bicyclic group Chemical group 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
Classifications
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- H02J3/383—
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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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention relates to a kind of tandem type microgrid structures of isolated operation, including DC generation unit, AC/DC conversion circuit and sample circuit；Wherein, DC generation unit includes dc-link capacitance；AC/DC conversion circuit includes main power inversion circuit and filter circuit；Sample circuit includes filter inductance current sampling circuit and filter capacitor voltage sampling circuit；Further relate to the Poewr control method of above-mentioned microgrid structure.The present invention has the advantages that the microgrid structure eliminates the DC/DC boosting inverter link in traditional microgrid structure, reduces system cost, improve the efficiency of converter.
Description
Technical field
The present invention relates to a kind of tandem type microgrid structure of isolated operation, a kind of above-mentioned tandem type microgrid structure is further related to
Poewr control method.
Background technique
Microgrid is the autonomous system for having self-contr ol He self energy management, and DG is accessed in the form of microgrid,
It is generally considered and utilizes DG most effective way.Microgrid can be incorporated into the power networks with external electrical network, can also be with isolated operation.Microgrid
When isolated operation, the receiving ability of distributed energy can be improved；Guarantee that critical load power supply, the power supply for improving user are reliable
Property；Solve the power supply problem of user in from far-off regions, island and desert.
The DG unit of converters interface type is prevalent in micro-grid system, they are mainly connect with parallel way
Enter the points of common connection (PCC) of micro-capacitance sensor and bulk power grid.For grid-connected power generation system, such as photovoltaic generating system, generally by group
Serial type photovoltaic panel carries out boosting to certain voltage range through DC/DC transform part, generates electricity by way of merging two or more grid systems using inversion.Due to
The cost of system therefore largely is substantially increased using DC/DC converter in system, while also reducing the operation of DG system
Efficiency.If DG cell distribution is not concentrated, it can be just incorporated to system PCC by longer feeder line, this will cause certain feeder line
Impedance voltage drop loss.In order to reduce the cost of communication and control system, droop control method is widely used in micro-grid system.
But traditional droop control method has certain limitation, there are power distribution errors.
In view of practical application and cost is reduced, is badly in need of a kind of microgrid structure of No DC/DC transform part, while developing one
The algorithm of kind Simple And Practical carrys out accurate distribution power.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of tandem type microgrid structure of isolated operation and a kind of series connection
The Poewr control method of type microgrid structure.
In order to solve the above technical problems, the technical solution of the present invention is as follows: a kind of tandem type microgrid structure of isolated operation, is somebody's turn to do
Microgrid structure is used to access the points of common connection of micro-capacitance sensor and bulk power grid, and innovative point is: by three distributed power units
It is composed in series, respectively the first distributed power unit, the second distributed power unit and third distributed power unit, wherein
One end of outlet side one end connection common connecting point of first distributed power unit, the other end connect the second distributed generation resource list
The other end of one end of the outlet side of member, the outlet side of the second distributed power unit connects the defeated of third distributed power unit
One end of side out, the other end of the other end connection common connecting point of the outlet side of third distributed power unit；
The distributed power unit includes:
One direct current generator unit, the DC generation unit are formed in parallel by dc-link capacitance and group-serial photovoltaic panel；
One AC/DC conversion circuit, the AC/DC conversion circuit include main power inversion circuit and filter circuit,
Filter circuit is made of filter inductance and filter capacitor, the output end phase of the input terminal of filter inductance and main power inversion circuit
Even, the output end of filter inductance is connected with the input terminal of filter capacitor, and accesses one end or another distribution of points of common connection
The output end of the filter capacitor of formula power supply unit, the output end of filter capacitor and the filter inductance of another distributed power unit
Output end be connected or access points of common connection the other end；
One sample circuit, the sample circuit include the filter inductance current sampling circuit of sampling filter inductive current and adopt
The filter capacitor voltage sampling circuit of sample filter capacitor voltage.
Further, the group-serial photovoltaic panel is made of multiple series-parallel photovoltaic modulies.
Further, the main power inversion circuit is bridge type inverse structure.
Further, the filter capacitor voltage sampling circuit is equipped with using capacitor or using resistance.
A kind of Poewr control method of tandem type microgrid structure, innovative point are: step are as follows:
A) firstly, filter inductance electric current is measured, to obtain inductor current feedback signal Io, filter capacitor voltage is measured, with
Obtain capacitance voltage feedback signal Vc；
B) by inductor current feedback signal IoWith capacitance voltage feedback signal Vc, obtain distributed power unit instantaneously has
Function power and reactive power, and calculate its power-factor cos (θ)；
C) power factor value is exported as power factor/frequency inverse dip control method input factor as reference angle
Frequencies omegaDG, and then obtain voltage reference value Vref, it is as follows:
ωDG=ω*+DPFCos (θ),
In formula, ω*For specified angular frequency, DPFFor inverse dip control coefrficient, E is voltage rating reference value；
D) it for the voltage reference value, is tracked using bicyclic voltage controller, the outer loop control of bicyclic voltage controller
Device quasi resonant control, the transmission function of outer ring are Gouter(s), outer ring output current reference value is Iref；The transmitting letter of inner ring
Number is GInner(s), inner ring output is the reference voltage value V modulated for pulse widthout, it is as follows:
In formula, kp、kinnerThe respectively proportional gain of outer ring and inner loop control, h are harmonic order, ki,hFor h order harmonics
Proportional gain, ωcFor the cutoff frequency of quasi resonant control.
The present invention has the advantages that multiple distributed power units are passed through series connection by the tandem type microgrid structure in the present invention
Mode connects, and is different from traditional multiple distributed power unit grid-connected modes, which eliminates traditional microgrid structure
In DC/DC boosting inverter link improve the operational efficiency of distributed power unit to reduce system cost.
The DC side input voltage class requirement of distributed power unit is reduced, the utilization rate of new energy, phase are improved
System Construction cost is reduced over the ground.
The output electric current and output frequency perseverance of each distributed power unit are equal, while not considering further that distributed generation resource list
Circulation problem between member.
In addition, be directed to the tandem type micro-capacitance sensor structure, Poewr control method of the invention, have the characteristics that it is simple and practical,
It only needs to acquire current signal all the way and all the way voltage signal, does not need the communication between distributed power unit, be also not required to
Obtain the parameter of micro-grid system；System output voltage waveform quality is high, and harmonic content is substantially reduced；Realize distributed generation resource
The accurate distribution of the active and reactive power of unit, to solve the accurate power distribution problem in traditional isolated microgrid.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is traditional parallel connection type micro-capacitance sensor structural schematic diagram.
Fig. 2 is tandem type micro-capacitance sensor structural schematic diagram of the invention.
Fig. 3 is power factor of the invention/frequency inverse dip control algolithm flow chart.
Fig. 4 is simulation waveform.
Specific embodiment
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this
It is bright to be limited among the embodiment described range.
A kind of tandem type microgrid structure of isolated operation as shown in Figure 2 and Figure 3 is connected by three distributed power units
Composition, respectively the first distributed power unit, the second distributed power unit and third distributed power unit, wherein first
One end of outlet side one end connection common connecting point of distributed power unit, the other end connect the second distributed power unit
One end of outlet side, the outlet side of the other end connection third distributed power unit of the outlet side of the second distributed power unit
One end, the outlet side of third distributed power unit the other end connection common connecting point the other end.
Distributed power unit includes DC generation unit 1, AC/DC conversion circuit 2 and sample circuit 3.
DC generation unit 1 is formed in parallel by dc-link capacitance 12 and group-serial photovoltaic panel, and group-serial photovoltaic panel is by more
A series-parallel photovoltaic module is constituted.
AC/DC conversion circuit 2 includes main power inversion circuit 21 and filter circuit 22, and main power inversion circuit 21 is
Bridge type inverse structure, filter circuit 22 are made of filter inductance 221 and filter capacitor 222, the input terminal of filter inductance 221 and master
The output end of power inversion circuit 21 is connected, and the output end of filter inductance 221 is connected with the input terminal of filter capacitor 222, and connects
Enter the output end of one end of points of common connection or the filter capacitor of another distributed power unit, the output of filter capacitor 222
Hold the other end for being connected or accessing points of common connection with the output end of the filter inductance of another distributed power unit.
Sample circuit 3 includes the filter inductance current sampling circuit 31 and sampling filter capacitor electricity of sampling filter inductive current
The filter capacitor voltage sampling circuit 32 of pressure, filter capacitor voltage sampling circuit is equipped with using capacitor or using resistance.
A kind of Poewr control method for above-mentioned tandem type microgrid structure, as shown in figure 3, its step is specific as follows:
The first step measures filter inductance electric current, to obtain inductor current feedback signal Io, filter capacitor voltage is measured, with
Obtain capacitance voltage feedback signal Vc。
Second step, by inductor current feedback signal IoWith capacitance voltage feedback signal Vc, obtain the wink of distributed power unit
When active power and reactive power, and calculate its power-factor cos (θ).
Third step, the power factor value are exported as power factor/frequency inverse dip control method input factor as ginseng
Examine angular frequencyDG, and then obtain voltage reference value Vref, it is as follows:
ωDG=ω*+DPFCos (θ),
In formula, ω*For specified angular frequency, DPFFor inverse dip control coefrficient, E is voltage rating reference value.
4th step tracks the voltage reference value using bicyclic voltage controller, the outer ring of bicyclic voltage controller
Controller quasi resonant control, the transmission function of outer ring are Gouter(s), outer ring output current reference value is Iref；The biography of inner ring
Delivery function is GInner(s), inner ring output is the reference voltage value V for pulse width modulation (PWM)out, it is as follows:
In formula, kp、kinnerThe respectively proportional gain of outer ring and inner loop control, h are harmonic order, ki,hFor h order harmonics
Proportional gain, ωcFor the cutoff frequency of quasi resonant control.
Simulation waveform as shown in Figure 4 uses traditional sagging control before 1s, starts control method of the invention after 1s,
It knows to realize accurate active and reactive power distribution, demonstrates tandem type micro-capacitance sensor and its Poewr control method of the invention
Correctness.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, above-described embodiment and explanation
It is merely illustrated the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also has
Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention
It is defined by the appending claims and its equivalent thereof.
Claims (4)
1. the tandem type microgrid structure of a kind of Poewr control method of the tandem type microgrid structure of isolated operation, the isolated operation is used
It in the points of common connection of access micro-capacitance sensor and bulk power grid, is composed in series by three distributed power units, the respectively first distribution
Formula power supply unit, the second distributed power unit and third distributed power unit, wherein the first distributed power unit is defeated
One end of side one end connection points of common connection out, one end of the outlet side of the other end the second distributed power unit of connection, second
One end of the outlet side of the other end connection third distributed power unit of the outlet side of distributed power unit, third are distributed
The other end of the other end connection points of common connection of the outlet side of power supply unit；The distributed power unit includes: a direct current
Generator unit, the DC generation unit are formed in parallel by dc-link capacitance and group-serial photovoltaic panel；The conversion of one DC/AC
Circuit, the AC/DC conversion circuit include main power inversion circuit and filter circuit, and filter circuit is by filter inductance and filtering
Capacitor composition, the input terminal of filter inductance are connected with the output end of main power inversion circuit, the output end of filter inductance and filtering
The input terminal of capacitor is connected, and accesses the output of one end of points of common connection or the filter capacitor of another distributed power unit
End, the output end of the filter inductance of the output end and another distributed power unit of filter capacitor are connected or access commonly connected
The other end of point；One sample circuit, the sample circuit include the filter inductance current sampling circuit of sampling filter inductive current
And the filter capacitor voltage sampling circuit of sampling filter capacitance voltage；Step are as follows:
A) firstly, filter inductance electric current is measured, to obtain inductor current feedback signal Io, filter capacitor voltage is measured, to obtain electricity
Hold voltage feedback signal Vc；
B) by inductor current feedback signal IoWith capacitance voltage feedback signal Vc, obtain the instantaneous active function of distributed power unit
Rate and reactive power, and calculate its power-factor cos (θ)；
C) power factor value is exported as power factor/frequency inverse dip control method input factor as with reference to angular frequency
ωDG, and then obtain voltage reference value Vref, as follows: ωDG=ω*+DPFCos (θ),
In formula, ω*For specified angular frequency, DPFFor inverse dip control coefrficient, E is voltage rating reference value；
D) it for the voltage reference value, is tracked using bicyclic voltage controller, the outer ring controller of bicyclic voltage controller is used
Quasi resonant control, the transmission function of outer ring are Gouter(s), outer ring output current reference value is Iref；The transmission function of inner ring is
GInner(s), inner ring output is the reference voltage value V for pulse width modulation (PWM)out, it is as follows:
Vout=GInner(s)·(Iref-Io)
=kinner·(Iref-Io)
In formula, kp、kinnerThe respectively proportional gain of outer ring and inner loop control, h are harmonic order, ki,hFor the ratio of h order harmonics
Gain, ωcFor the cutoff frequency of quasi resonant control.
2. the Poewr control method of the tandem type microgrid structure of isolated operation according to claim 1, it is characterised in that: institute
Group-serial photovoltaic panel is stated to be made of multiple series-parallel photovoltaic modulies.
3. the Poewr control method of the tandem type microgrid structure of isolated operation according to claim 1, it is characterised in that: institute
Stating main power inversion circuit is bridge type inverse structure.
4. the Poewr control method of the tandem type microgrid structure of isolated operation according to claim 1, it is characterised in that: institute
Filter capacitor voltage sampling circuit is stated equipped with sampling capacitance or sampling resistor.
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| CN108459202A (en) * | 2017-12-16 | 2018-08-28 | 西安翌飞核能装备股份有限公司 | A kind of high-precision detecting method of active power and reactive power |
| CN108899937A (en) * | 2018-09-05 | 2018-11-27 | 阳光电源股份有限公司 | A kind of exchange optimizer system |
| CN109494795A (en) * | 2018-11-27 | 2019-03-19 | 国网山东省电力公司德州供电公司 | The inverse dip control method of tandem type distributed energy resource system, apparatus and system |
| CN110572067B (en) * | 2019-08-19 | 2021-06-08 | 天津大学 | Island energy storage type power unit series micro-grid structure and control method |
| CN110649649B (en) * | 2019-08-29 | 2023-04-07 | 天津大学 | Low-cost voltage-free sensor carrier phase shifting method used under island microgrid |
| CN110854909B (en) * | 2019-11-11 | 2022-05-27 | 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 | Fully-dispersed self-adaptive power control method for island operation series converter |
| CN111277161B (en) * | 2019-12-18 | 2023-03-10 | 天津大学 | Island-based control method for three-phase boost current source type inverter |
| CN111245254A (en) * | 2020-01-15 | 2020-06-05 | 清华大学 | Single-phase direct current port interconnected cascade multilevel converter |
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