CN104466956B - The tidal current computing method and device of a kind of distributed generation resource - Google Patents

The tidal current computing method and device of a kind of distributed generation resource Download PDF

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Publication number
CN104466956B
CN104466956B CN201410771408.9A CN201410771408A CN104466956B CN 104466956 B CN104466956 B CN 104466956B CN 201410771408 A CN201410771408 A CN 201410771408A CN 104466956 B CN104466956 B CN 104466956B
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distributed generation
generation resource
equivalent
msup
mrow
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CN104466956A (en
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斯江峰
郑晔
徐进
俞杭科
周玲
蒋表
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STATE GRID ZHEJIANG ZHUJI POWER SUPPLY Co Ltd
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Shaoxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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STATE GRID ZHEJIANG ZHUJI POWER SUPPLY Co Ltd
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Shaoxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Abstract

The embodiment of the present invention provides a kind of tidal current computing method and device of distributed generation resource, wherein, method includes：Determine the interface form of distributed generation resource；To the PV node that active-power P and voltage V are determined be equivalent to using the distributed generation resource of excitation voltage constant synchronization generator interface；It is determined P is equivalent to using the distributed generation resource of excitation voltage adjustable synchronous generator interface, P Q (V) node that reactive power Q changes with V and changed；To the PV node that P and V determine be equivalent to using the distributed generation resource of voltage-controlled type power electronic equipment interface；The distributed generation resource mouth that current-control type power electronic equipment connects will be used to be equivalent to the PI nodes that P and electric current I are determined；To PQ nodes be equivalent to using the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface；The distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface will not used to be equivalent to P Q (V) node.Calculation of tidal current is more accurately and reliably.

Description

The tidal current computing method and device of a kind of distributed generation resource
Technical field
The present invention relates to the Load flow calculation field of electric system, more particularly to a kind of Load flow calculation side of distributed generation resource Method and device.
Background technology
Load flow calculation be electric system it is very important analysis calculate, to study systems organization and operation in propose it is each Kind problem.So-called Load flow calculation is exactly the mode of connection of known power grid and parameter and service condition, calculates power system mesomeric state fortune Each busbar voltage of row, each branch current and power and network loss.For the electric system being currently running, can be sentenced by Load flow calculation It whether out-of-limit powers off net busbar voltage, branch current and power, if there is out-of-limit, should just take measures, adjust the method for operation.It is right In the electric system planned, by Load flow calculation, foundation can be provided for selection power grid power supply plan and electrical equipment.Tide Stream calculation can also provide original for the relay protection and fixed whole calculating of automatic device, electric power system fault calculating and stability Calculation etc. Data.
In the case where considering via net loss, when one timing of distributed generation resource capacity, any one section of branch in power distribution network In, the grid-connected position of distributed generation resource is closer to load, and network loss is smaller, in PQ nodes and the traditional network Load flow calculation mould of PV node In type, it is assumed that distributed generation resource is installed near the position of load point in network, since load point is PQ in Load flow calculation Node calculates, the load of distributed generation resource and place node is considered as a PV node for convenience, so as to which power distribution network is equivalent Balance nodes are contained only for one.
But for actual conditions, different distributed generation resources is grid-connected using different interface forms, and interface form has Synchronous generator, asynchronous generator and power electronic equipment three classes, wherein, power electronic equipment interface mainly include rectifier, The system comprising distributed generation resource with distinct interface form is equivalent to identical Load flow calculation by current transformer, inverter Model will influence the accuracy of calculation of tidal current.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of tidal current computing method and device of distributed generation resource, existing to solve Have in technology and the system comprising distributed generation resource with distinct interface form is equivalent to identical power flow algorithm, shadow The problem of ringing to the accuracy of calculation of tidal current.
To achieve the above object, the embodiment of the present invention provides following technical solution：
A kind of tidal current computing method of distributed generation resource, including：
Determine the interface form of distributed generation resource；
To active-power P be equivalent to using the distributed generation resource of excitation voltage constant synchronization generator interface and voltage V is true Fixed PV node；
It is determined P is equivalent to using the distributed generation resource of excitation voltage adjustable synchronous generator interface, reactive power Q is with V P-Q (V) node for changing and changing；
To the PV node that P and V determine be equivalent to using the distributed generation resource of voltage-controlled type power electronic equipment interface；
The distributed generation resource mouth that current-control type power electronic equipment connects will be used to be equivalent to the PI sections that P and electric current I are determined Point；
To PQ nodes be equivalent to using the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface；
The distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface will not used to be equivalent to P-Q (V) node.
Wherein, Q in P-Q (V) nodeGRelation with V is：
Wherein, x be the sum of stator reactance and rotor reactance, xmFor field excitation branch line reactance.
Wherein, Q in the PI nodesERelation with I is：
Wherein, it is described the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface not to be used to include：It is asynchronous Wind-driven generator,
The power P of the asynchronous wind driven generatormFor：
Wherein, ρ is atmospheric density, unit km/m3；A is sectional area of the wind power generator impeller perpendicular to wind speed, and unit is m2；V is wind speed, unit m/s；CpFor the power coefficient of generator.
Wherein, the wind speed V is：
Wherein, VrWind speed is surveyed by meteorological observatory's anemometer tower, h is wind power generator impeller height, hrFor anemometer tower height, γ For trimming coefficient.
Wherein, included using the distributed generation resource of voltage-controlled type power electronic equipment interface：Photovoltaic generator,
The recommended current I of the photovoltaic generatorPVWith optimum operating voltage VPVFor：
Wherein, ISCFor the short circuit current flow of light generator, VOCFor the open-circuit voltage of photovoltaic generator, ImpFor photovoltaic generator Maximum power point electric current, VmpFor photovoltaic generation and maximum power point voltage, HtFor standard intensity of illumination, T is normal temperature, TAFor Environment temperature, βoFor photovoltaic battery panel angle of inclination, HθFor the solar radiation quantity on photovoltaic battery panel.
Wherein, the photovoltaic generator output power PPVFor：
PPV=VPVIPV,
Wherein, IPVFor recommended current and VPVFor optimum operating voltage.
Wherein, the solar radiation quantity HθThe average value or instantaneous value of data are observed for meteorological observatory.
Wherein, the standard intensity of illumination is 1000W/m2, and the normal temperature is 25 DEG C.
A kind of Load flow calculation device of distributed generation resource, including：Determining module, first processing module, Second processing module, 3rd processing module, fourth processing module, the 5th processing module and the 6th processing module；Wherein,
The determining module, for determining the interface form of distributed generation resource；
The first processing module, for the distributed generation resource of excitation voltage constant synchronization generator interface will to be used equivalent The PV node determined for active-power P and voltage V；
The Second processing module, for the distributed generation resource of excitation voltage adjustable synchronous generator interface will to be used equivalent It is determined for P, P-Q (V) node that reactive power Q changes with V and changed；
3rd processing module, for the distributed generation resource of voltage-controlled type power electronic equipment interface will to be used equivalent The PV node determined for P and V；
The fourth processing module, for the distributed generation resource mouth that current-control type power electronic equipment connects will to be used equivalent The PI nodes determined for P and electric current I；
5th processing module, for the distributed electrical of invariable power factor controlling asynchronous wind driven generator interface will to be used Source is equivalent to PQ nodes；
6th processing module, for will not use the distribution of invariable power factor controlling asynchronous wind driven generator interface Power supply is equivalent to P-Q (V) node.
Based on above-mentioned technical proposal, the tidal current computing method and device of distributed generation resource provided in an embodiment of the present invention, really After the interface form for determining distributed generation resource, it will be equivalent to using the distributed generation resource of excitation voltage constant synchronization generator interface The PV node that work(power P and voltage V are determined will be equivalent to using the distributed generation resource of excitation voltage adjustable synchronous generator interface P determines that P-Q (V) node that reactive power Q changes with V and changed will be using point of voltage-controlled type power electronic equipment interface Cloth power supply is equivalent to the PV node that P and V are determined, by distributed generation resource mouth connect using current-control type power electronic equipment etc. The PI nodes determined for P and electric current I are imitated, by distributed generation resource using invariable power factor controlling asynchronous wind driven generator interface etc. It imitates as PQ nodes, the distributed generation resource that will not use invariable power factor controlling asynchronous wind driven generator interface be equivalent to P-Q (V) sections Point.Because different distributed generation resources is grid-connected using different interface forms, mainly include synchronous generator interface, asynchronous hair Motor interface and power electronic equipment interface three classes, wherein, synchronous generator interface includes that excitation voltage is constant and excitation voltage Adjustable two ways, power electronic equipment interface bag voltage-controlled type and current-control type, asynchronous wind driven generator interface include It is controlled using constant power factor and does not control two kinds using constant power factor, therefore, the inhomogeneity of distinct interface form will be used Type distributed generation resource is equivalent to corresponding power flow algorithm, i.e., is saved to being equivalent to PV node, PQ nodes, PI nodes and P-Q (V) The distributed generation resource of point is carried out respectively using PV node model, PQ nodal analysis methods, PI nodal analysis methods and P-Q (V) nodal analysis methods Load flow calculation makes calculation of tidal current more accurately and reliably.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.
Fig. 1 is the flow chart of system load flow computational methods provided in an embodiment of the present invention；
Fig. 2 is the system block diagram of system load flow computing device provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment belongs to the scope of protection of the invention.
Fig. 1 is the flow chart of the system load flow computational methods of distributed generation resource provided in an embodiment of the present invention, will be used not Different type distributed generation resource with interface form is equivalent to corresponding power flow algorithm, makes calculation of tidal current more accurate Reliably；With reference to Fig. 1, the system load flow computational methods of the distributed generation resource can include：
Step S100：Determine the interface form of distributed generation resource；
Emerging distributed generation technology mainly include using the small size gas turbine of fossil fuel, miniature gas turbine, The technologies such as photovoltaic cell, wind-power electricity generation, biomass power generation, the tidal power generation of fuel cell technology and use regenerative resource.
Different distributed generation resources is grid-connected using different interface forms, mainly including synchronous generator, asynchronous generator And power electronic equipment three classes.Power electronic equipment interface mainly includes rectifier, current transformer, inverter, with power electronics The development of technology and control new technology, inversion transformation technique are rapidly developed.It is connected, operated with power grid by converters Simply, and there is the ability that reactive power is contributed that adjusts, the stability of system operation can be improved.Common distributed generation resource holds Amount and interface type are as shown in table 1：
1 common distributed generation resource capacity of table and interface type
Step S110：To active-power P be equivalent to using the distributed generation resource of excitation voltage constant synchronization generator interface The PV node model determined with voltage V；
Step S120：It is determined P is equivalent to using the distributed generation resource of excitation voltage adjustable synchronous generator interface, it is idle P-Q (V) nodal analysis method that power Q changes with V and changed；
Synchronous generator interface includes that excitation voltage is constant and the adjustable two ways of excitation voltage, the former can be regarded as PV sections Point carries out Load flow calculation, and the latter is regarded as P-Q (V) node.Such interface is with less, such as geothermal energy distributed generation resource；
Step S130：It will be equivalent to what P and V was determined using the distributed generation resource of voltage-controlled type power electronic equipment interface PV node model；
Step S140：The distributed generation resource mouth connect using current-control type power electronic equipment is equivalent to P and electric current I is true Fixed PI nodal analysis methods；
Power electronic equipment interface includes a variety of current transformers, and node where voltage-controlled type device is general equivalent into PV sections Point；Node where current-control type device is general equivalent into PI nodes, and this interface is with extensive, including photovoltaic generation, small-sized Gas turbine, fuel cell, synchronous speed change wind-driven generator etc..
Step S150：To PQ sections be equivalent to using the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface Point model；
Step S160：The distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface will not used to be equivalent to P- Q (V) nodal analysis method.
Asynchronous wind driven generator interface can then be equivalent to PQ nodes according to constant power factor control, otherwise can be equivalent into P- Q (V) node is handled.
Based on above-mentioned technical proposal, the system load flow computational methods and dress of distributed generation resource provided in an embodiment of the present invention It puts, after the interface form for determining distributed generation resource, by distributed generation resource using excitation voltage constant synchronization generator interface etc. The PV node determined for active-power P and voltage V is imitated, it will be using the distributed generation resource of excitation voltage adjustable synchronous generator interface It is equivalent to P to determine, P-Q (V) node that reactive power Q changes with V and changed will be connect using voltage-controlled type power electronic equipment The distributed generation resource of mouth is equivalent to the PV node that P and V are determined, the distributed electrical that will be connect using current-control type power electronic equipment Source mouthful is equivalent to the PI nodes that P and electric current I are determined, will be using the distribution of invariable power factor controlling asynchronous wind driven generator interface Power supply is equivalent to PQ nodes, the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface will not used to be equivalent to P- Q (V) node.Because different distributed generation resources is grid-connected using different interface forms, mainly include synchronous generator interface, Asynchronous generator interface and power electronic equipment interface three classes, wherein, it is constant and encourage that synchronous generator interface includes excitation voltage Magnetoelectricity presses adjustable two ways, and power electronic equipment interface bag voltage-controlled type and current-control type, asynchronous wind driven generator connect Mouth is included being controlled using constant power factor and constant power factor is not used to control two kinds, therefore, will use distinct interface form Different type distributed generation resource is equivalent to corresponding power flow algorithm, makes calculation of tidal current more accurately and reliably.
Optionally, Q in P-Q (V) nodeGRelation with V can be：
Wherein, x be the sum of stator reactance and rotor reactance, xmFor field excitation branch line reactance
Optionally, Q in PI nodesERelation with I can be：
Optionally, not using the asynchronous wind-force in the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface The power P of generatormCan be：
Wherein, ρ is atmospheric density, unit km/m3；A is sectional area of the wind power generator impeller perpendicular to wind speed, and unit is m2；V is wind speed, unit m/s；CpFor the power coefficient of generator.
Wherein, wind speed V can be：
Wherein, VrWind speed is surveyed by meteorological observatory's anemometer tower, h is wind power generator impeller height, hrFor anemometer tower height, γ For trimming coefficient.
Optionally, trimming coefficient gamma can be using value as 1/7.
The best effort of the photovoltaic generator of the optional distributed generation resource using voltage-controlled type power electronic equipment interface Electric current IPVWith optimum operating voltage VPVCan be：
Wherein, ISCFor the short circuit current flow of light generator, VOCFor the open-circuit voltage of photovoltaic generator, ImpFor photovoltaic generator Maximum power point electric current, VmpFor photovoltaic generation and maximum power point voltage, HtFor standard intensity of illumination, T is normal temperature, TAFor Environment temperature, βoFor photovoltaic battery panel angle of inclination, HθFor the solar radiation quantity on photovoltaic battery panel.
Optionally, photovoltaic generator output power PPVCan be：
PPV=VPVIPV,
Wherein, IPVFor recommended current and VPVFor optimum operating voltage.
Optionally, solar radiation quantity HθCan be the average value or instantaneous value that data are observed by meteorological observatory.
Optionally, standard intensity of illumination can be 1000W/m2, and the normal temperature can be 25 DEG C.
The tidal current computing method of distributed generation resource provided in an embodiment of the present invention uses the different type of distinct interface form Distributed generation resource is equivalent to corresponding power flow algorithm, i.e., to being equivalent to PV node, PQ nodes, PI nodes and P-Q (V) node Distributed generation resource carry out tide using PV node model, PQ nodal analysis methods, PI nodal analysis methods and P-Q (V) nodal analysis methods respectively Stream calculation makes calculation of tidal current more accurately and reliably.
The Load flow calculation device of distributed generation resource provided in an embodiment of the present invention is introduced below, described below point The Load flow calculation device of cloth power supply can correspond reference with the tidal current computing method of above-described distributed generation resource.
Fig. 2 is the system block diagram of the Load flow calculation device of distributed generation resource provided in an embodiment of the present invention, should with reference to Fig. 2 The Load flow calculation device of distributed generation resource can include：Determining module 100, first processing module 200, Second processing module 300, 3rd processing module 400, fourth processing module 500, the 5th processing module 600 and the 6th processing module 700；Wherein,
Determining module 100, for determining the interface form of distributed generation resource；
First processing module 200, for the distributed generation resource of excitation voltage constant synchronization generator interface will to be used equivalent The PV node determined for active-power P and voltage V；
Second processing module 300, for the distributed generation resource of excitation voltage adjustable synchronous generator interface will to be used equivalent It is determined for P, P-Q (V) node that reactive power Q changes with V and changed；
3rd processing module 400, for the distributed generation resource of voltage-controlled type power electronic equipment interface will to be used equivalent The PV node determined for P and V；
Fourth processing module 500, for the distributed generation resource mouth that current-control type power electronic equipment connects will to be used equivalent The PI nodes determined for P and electric current I；
5th processing module 600, for the distributed electrical of invariable power factor controlling asynchronous wind driven generator interface will to be used Source is equivalent to PQ nodes；
6th processing module 700, for will not use the distribution of invariable power factor controlling asynchronous wind driven generator interface Power supply is equivalent to P-Q (V) node.
The Load flow calculation device of distributed generation resource provided in an embodiment of the present invention, uses the different type of distinct interface form Distributed generation resource is equivalent to corresponding power flow algorithm, i.e., to being equivalent to PV node, PQ nodes, PI nodes and P-Q (V) node Distributed generation resource carry out tide using PV node model, PQ nodal analysis methods, PI nodal analysis methods and P-Q (V) nodal analysis methods respectively Stream calculation makes calculation of tidal current more accurately and reliably.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part It is bright.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description And algorithm steps, can be realized with the combination of electronic hardware, computer software or the two, in order to clearly demonstrate hardware and The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These Function is performed actually with hardware or software mode, specific application and design constraint depending on technical solution.Specialty Technical staff can realize described function to each specific application using distinct methods, but this realization should not Think beyond the scope of this invention.
It can directly be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention. A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one The most wide scope caused.

Claims (6)

1. a kind of tidal current computing method of distributed generation resource, which is characterized in that including：
Determine the interface form of distributed generation resource；
To active-power P be equivalent to using the distributed generation resource of excitation voltage constant synchronization generator interface and voltage V is determined PV node；
It is determined P is equivalent to using the distributed generation resource of excitation voltage adjustable synchronous generator interface, reactive power Q changes with V And P-Q (V) node changed；
To the PV node that P and V determine be equivalent to using the distributed generation resource of voltage-controlled type power electronic equipment interface；
The distributed generation resource mouth that current-control type power electronic equipment connects will be used to be equivalent to the PI nodes that P and electric current I are determined；
To PQ nodes be equivalent to using the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface；
The distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface will not used to be equivalent to P-Q (V) node.
2. tidal current computing method according to claim 1, which is characterized in that Q in P-Q (V) nodeGWith the relation of V For：
<mrow> <msub> <mi>Q</mi> <mi>G</mi> </msub> <mo>=</mo> <mfrac> <msup> <mi>V</mi> <mn>2</mn> </msup> <msub> <mi>x</mi> <mi>m</mi> </msub> </mfrac> <mo>+</mo> <mfrac> <mrow> <msup> <mi>V</mi> <mn>2</mn> </msup> <mo>-</mo> <msqrt> <mrow> <msup> <mi>V</mi> <mn>4</mn> </msup> <mo>-</mo> <mn>4</mn> <msup> <mi>P</mi> <mn>2</mn> </msup> <msup> <mi>x</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mrow> <mrow> <mn>2</mn> <mi>x</mi> </mrow> </mfrac> <mo>,</mo> </mrow>
Wherein, x be the sum of stator reactance and rotor reactance, xmFor field excitation branch line reactance.
3. tidal current computing method according to claim 1, which is characterized in that Q in the PI nodesERelation with I is：
<mrow> <msub> <mi>Q</mi> <mi>E</mi> </msub> <mo>=</mo> <msqrt> <mrow> <msup> <mi>I</mi> <mn>2</mn> </msup> <msup> <mi>V</mi> <mn>2</mn> </msup> <mo>-</mo> <msup> <mi>P</mi> <mn>2</mn> </msup> </mrow> </msqrt> <mo>.</mo> </mrow>
4. tidal current computing method according to claim 1, which is characterized in that described not asynchronous using invariable power factor controlling The distributed generation resource of wind-driven generator interface includes：Asynchronous wind driven generator,
The power P of the asynchronous wind driven generatormFor：
<mrow> <msub> <mi>P</mi> <mi>m</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <msup> <mi>&amp;rho;AV</mi> <mn>3</mn> </msup> <msub> <mi>C</mi> <mi>p</mi> </msub> <mo>,</mo> </mrow>
Wherein, ρ is atmospheric density, unit km/m3；A is wind power generator impeller perpendicular to the sectional area of wind speed, unit m2；V For wind speed, unit m/s；CpFor the power coefficient of generator.
5. the tidal current computing method according to right wants 4, which is characterized in that the wind speed V is：
<mrow> <mi>V</mi> <mo>=</mo> <msub> <mi>V</mi> <mi>r</mi> </msub> <msup> <mrow> <mo>(</mo> <mfrac> <mi>h</mi> <msub> <mi>h</mi> <mi>r</mi> </msub> </mfrac> <mo>)</mo> </mrow> <mi>&amp;gamma;</mi> </msup> <mo>,</mo> </mrow>
Wherein, VrWind speed is surveyed by meteorological observatory's anemometer tower, h is wind power generator impeller height, hrFor anemometer tower height, γ is to cut Side coefficient.
6. a kind of Load flow calculation device of distributed generation resource, which is characterized in that including：Determining module, first processing module, second Processing module, the 3rd processing module, fourth processing module, the 5th processing module and the 6th processing module；Wherein,
The determining module, for determining the interface form of distributed generation resource；
The first processing module, for the distributed generation resource for using excitation voltage constant synchronization generator interface to be equivalent to The PV node that work(power P and voltage V are determined；
The Second processing module, for the distributed generation resource for using excitation voltage adjustable synchronous generator interface to be equivalent to P It determines, P-Q (V) node that reactive power Q changes with V and changed；
3rd processing module, for the distributed generation resource for using voltage-controlled type power electronic equipment interface to be equivalent to P The PV node determined with V；
The fourth processing module, for the distributed generation resource mouth that current-control type power electronic equipment is used to connect to be equivalent to P The PI nodes determined with electric current I；
5th processing module, for distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface etc. will to be used It imitates as PQ nodes；
6th processing module, for will not use the distributed generation resource of invariable power factor controlling asynchronous wind driven generator interface It is equivalent to P-Q (V) node.
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