CN105703364A - Photovoltaic power station equivalent modeling method - Google Patents
Photovoltaic power station equivalent modeling method Download PDFInfo
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- CN105703364A CN105703364A CN201610239760.7A CN201610239760A CN105703364A CN 105703364 A CN105703364 A CN 105703364A CN 201610239760 A CN201610239760 A CN 201610239760A CN 105703364 A CN105703364 A CN 105703364A
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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
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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
- 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]
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a photovoltaic power station equivalent modeling method. The photovoltaic power station equivalent modeling method comprises the steps of building a simulation model of a grid-connected photovoltaic generation unit, including, a transient control module; carrying out a fault simulation experiment for the grid-connected photovoltaic generation unit, obtaining active power response curves in the presence of different voltage drop depths and different time of duration, and storing the active power response curves in the presence of different voltage drop depths and different time of duration into corresponding offline databases; selecting matched offline databases based on the really measured voltage drop depth and time of duration, selecting the active power response curves from the matched offline databases based on the output of the grid-connected photovoltaic generation unit, and clustering and grouping the selected active power response curves based on the active power response similarity when the transient control module is enabled so as to obtain multiple generator set groups; calculating a first equivalent parameter of each generator set group and a second equivalent parameter of a current collection circuit, and building an equivalent model based on the first equivalent parameters and the second equivalent parameter.
Description
Technical field
The present invention relates to electric system simulation modeling technique field, particularly relate to a kind of photovoltaic plant equivalent modeling method。
Background technology
Along with the fast development of photovoltaic generation, the grid-connected impact on power system of large-scale photovoltaic also day by day highlights。Owing to photovoltaic generation has randomness, intermittent feature, the safe and stable operation of power system is brought new challenge by the grid-connected meeting of large-scale photovoltaic power station, so it is very necessary to set up the phantom that can accurately reflect photovoltaic plant output characteristics。In actual applications, in one photovoltaic plant, photovoltaic generation unit is large number of and operating condition is different, photovoltaic plant scale of model will be made very huge if each photovoltaic generation unit carries out modeling in detail, also bring along the problems such as such as simulation time length, committed memory are big。
Research for large-scale photovoltaic power station Equivalent Modeling aspect at present specifically includes that 1) photovoltaic plant Modeling Research: the research for photovoltaic plant modeling is based on theoretic more, the contrast verification testing data with reality is less, the control strategy that the control strategy of institute's established model and actual light overhead utility are taked may there are differences, and the engineering adaptability that above difference causes set up model is poor。2) Equivalent Modeling research: unit can be divided into equivalent and the equivalent two kinds of thinkings of multimachine。Unit method of equivalents is to be an equivalent photovoltaic generation unit by whole photovoltaic plant equivalence, and the power of equivalence generator unit is the algebraical sum of all generator unit power。For large-sized photovoltaic power station, between photovoltaic generation unit, operating condition may there are differences, and unit method of equivalents can exist and is difficult to take into account the problem of running status difference between generator unit, can produce certain systematic error。Multimachine method of equivalents is according to different principles of hiving off, and is several equivalence photovoltaic generation units by photovoltaic plant equivalence。Compared to unit method of equivalents, multimachine model more can embody the diversity of each generator unit running status, and the method is strategy it is crucial that selection is reasonably hived off。More current existing research is based on and considers that the photovoltaic plant of dissimilar inverter composition hives off equivalent problem, it is difficult to the photovoltaic plant of reflection same kind inverter composition output characteristics under different operating conditions there are differences, and engineering adaptability is poor。
Summary of the invention
Based on this, it is necessary to for the problem that prior art engineering adaptability is poor, it is provided that a kind of photovoltaic plant equivalent modeling method。
A kind of photovoltaic plant equivalent modeling method, comprises the following steps:
Setting up the grid-connected phantom of single grid-connected photovoltaic power generation unit, wherein, described grid-connected phantom includes arranging the transient state of the active power regeneration rate during fault recovery and controls module；
According to described grid-connected phantom, single grid-connected photovoltaic power generation unit is carried out fault simulation test, obtain the different Voltage Drop degree of depth and under the persistent period described grid-connected photovoltaic power generation unit and the active power response curve of site, the different Voltage Drop degree of depth and the active power response curve under the persistent period are respectively stored in corresponding offline database；Wherein, described photovoltaic electric station grid connection point is the points of common connection of each grid-connected photovoltaic power generation unit in photovoltaic plant；
The Voltage Drop degree of depth measured in real time according to photovoltaic plant and persistent period, select the offline database of each grid-connected photovoltaic power generation units match, from the offline database of described coupling, corresponding active power response curve is selected according to exerting oneself of each grid-connected photovoltaic power generation unit, when described transient state control module enables, according to active power response similarity, the active power response curve selected is carried out cluster to hive off, obtain multiple generating set group；
Calculate the first equivalent parameters of each generating set group and the second equivalent parameters of corresponding current collection circuit, set up the Equivalent Model of photovoltaic plant according to described first equivalent parameters and the second equivalent parameters。
Above-mentioned photovoltaic plant equivalent modeling method, considers the impact of actual light overhead utility active power regeneration rate during fault recovery in the modelling phase of photovoltaic plant and it is embodied in control strategy, so that set up model has good engineering adaptability。The strategy principle of hiving off proposed based on active power response curve similarity is simple, and physical meaning is clear and definite, it is not necessary to complicated calculating, and the various typical case's operating conditions for photovoltaic plant have good adaptability；And it is poor to efficiently solve conventional individual method of equivalents equivalence precision, multimachine method of equivalents hives off complicated, the computationally intensive problem of strategy。
Accompanying drawing explanation
Fig. 1 is photovoltaic plant equivalent modeling method flow chart；
Active power transient recovery process schematic when Fig. 2 is to consider the restriction of active power regeneration rate；
Fig. 3 is single photovoltaic generation unit transient response characteristic Simulation model schematic；
Fig. 4 be do not consider active power regeneration rate when limiting single photovoltaic generation unit under different illumination intensity and site active power transient response curve synoptic diagram；
The single photovoltaic generation unit also site active power transient response curve synoptic diagram under different illumination intensity when Fig. 5 is to consider the restriction of active power regeneration rate；
Fig. 6 is photovoltaic plant detailed model schematic diagram；
Fig. 7 (a) does not consider when photovoltaic plant when active power regeneration rate limits is equivalent to unit and the equivalent effect contrast figure of site active power；
Fig. 7 (b) does not consider when photovoltaic plant when active power regeneration rate limits is equivalent to unit and the equivalent effect contrast figure of site reactive power；
Fig. 8 (a) does not consider that when active power regeneration rate limits, photovoltaic plant is equivalent to the equivalent effect contrast figure of grid-connected point voltage during unit；
Fig. 8 (b) does not consider when photovoltaic plant when active power regeneration rate limits is equivalent to unit and the equivalent effect contrast figure of site electric current；
When Fig. 9 (a) is to consider the restriction of active power regeneration rate, photovoltaic plant is equivalent to two machines and unit and the equivalent effect contrast figure of site active power；
When Fig. 9 (b) is to consider the restriction of active power regeneration rate, photovoltaic plant is equivalent to two machines and unit and the equivalent effect contrast figure of site reactive power；
Figure 10 (a) is that when considering the restriction of active power regeneration rate, photovoltaic plant is equivalent to the equivalent effect contrast figure of grid-connected point voltage when two machines and unit；
When Figure 10 (b) is to consider the restriction of active power regeneration rate, photovoltaic plant is equivalent to two machines and unit and the equivalent effect contrast figure of site electric current。
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the photovoltaic plant equivalent modeling method of the present invention is described。
Fig. 1 is the photovoltaic plant equivalent modeling method flow chart of the present invention。As it is shown in figure 1, described photovoltaic plant equivalent modeling method can comprise the following steps that
S1, sets up the grid-connected phantom of single grid-connected photovoltaic power generation unit, and wherein, described grid-connected phantom includes arranging the transient state of the active power regeneration rate during fault recovery and controls module；
In this step, described photovoltaic generation unit model can include photovoltaic array, direct current junction station, direct current cables, inverter and the first control system thereof, discharging circuit and the second control system thereof, ac filter circuit model, booster transformer model and exchange current collection circuit model。
Active power regeneration rate during module considers fault recovery can be controlled by the transient state in described grid-connected phantom to limit, thus more conforming to practical situation。Transient state controls the pattern of active power regeneration rate restriction during module can account for and not consider fault recovery and switches。
Consider during fault recovery that the control model of active power regeneration rate restriction controls module watt current reference value and presents the process that a piecewise function recovers successively after referring mainly to failure removal, and can be approximately considered in every section of recovery process and uniformly recover in linear function。The split time t of piecewise function and the recovery slope k of every section can carry out the setting of correspondence according to concrete photovoltaic DC-to-AC converter type。Consider the active power transient recovery process schematic of active power regeneration rate restriction as shown in Figure 2。In fig. 2, abscissa is the time, and vertical coordinate is active power value。0～t is active power value under normal circumstances, and t～t+t1 moment is the active power value during fault, and t+t1～t+t2 and t+t2～t+t3 is the active power value during fault recovery。Function slope during t+t1～t+t2 and t+t2～t+t3 can be set to the active power regeneration rate during fault recovery。
S2, according to described grid-connected phantom, single grid-connected photovoltaic power generation unit is carried out fault simulation test, obtain the different Voltage Drop degree of depth and under the persistent period described grid-connected photovoltaic power generation unit and the active power response curve of site, the different Voltage Drop degree of depth and the active power response curve under the persistent period are respectively stored in corresponding offline database；Wherein, described photovoltaic electric station grid connection point is the points of common connection of each grid-connected photovoltaic power generation unit in photovoltaic plant；Wherein, the transient response phantom schematic diagram of single grid-connected photovoltaic power generation unit is as shown in Figure 3。In figure 3, intensity of illumination Ir and two environmental variables of temperature T can be set, it is sent in photovoltaic generation unit model PV1, photovoltaic generation unit PV1 is connected and by current collection circuit Feeder, step-up transformer low voltage side bus BT, booster transformer (parameter is 110kV/10kV10MVA) with also site bus BUS, and being connected with three phase mains (parameter is 110kV2500MVA), it is grid-connected to realize。Three-PhaseFault module is that fault arranges module, it is possible to the Voltage Drop degree of depth different by this module settings and persistent period。GroundingTransformer is grounding transformer, and grounding transformer and coupled resistance and earth point provide a reference point over the ground for step-up transformer low voltage side system in phantom jointly。
In this step, the input intensity of illumination that can set described grid-connected photovoltaic power generation unit ranges for minimum threshold and the max-thresholds of grid-connected photovoltaic power generation unit operating condition, described minimum threshold and max-thresholds can set respectively according to the type of each grid-connected photovoltaic power generation unit, can obtain within the scope of from described minimum threshold to described max-thresholds the different Voltage Drop degree of depth and the persistent period described grid-connected photovoltaic power generation unit and the active power response curve of site。Also can set the step interval of described input intensity of illumination as 50W/m2, temperature could be arranged to 25 DEG C of standard operating conditions, or is set according to actual condition。
Wherein, the minimum threshold of operating condition is the photovoltaic generation unit situation that active power of output is minimum in actual normal course of operation; may generally be 0.2 times of specified active power; when active power of output is lower than this limit value, the conversion efficiency of the element such as inverter can be substantially reduced; the quality of power supply simultaneously exported can be deteriorated, and now can select to shut down。
The max-thresholds of operating condition is the photovoltaic generation unit situation that active power of output is maximum in actual normal course of operation, may generally be 1.1 times of specified active power, electric elements overload can be there is when active power of output is higher than this limit value, damage the risk of electrical equipment, now output can be limited so that it is at rated power operation。
The Voltage Drop depth bounds that can set described grid-connected phantom is the 5% to 100% of rated voltage, and can set the step interval of the described Voltage Drop degree of depth as the 5% of rated voltage。Different Voltage Drop degree can be simulated by the resistance of change earth resistance。Persistent period may be set to the simulation time 0.625s of low voltage crossing test, or is set according to actual condition。
According to the above-mentioned setting for single grid-connected photovoltaic power generation unit transient response characteristic Simulation model, it is possible to multiple operating condition is carried out simulation analysis, obtain the offline database of correspondence。Fig. 4 and Fig. 5 respectively do not consider failure removal after active power regeneration rate restriction and consider after failure removal photovoltaic generation unit active power transient response curve under difference exerts oneself operating mode in two kinds of situations of active power regeneration rate restriction。
S3, the Voltage Drop degree of depth measured in real time according to photovoltaic plant and persistent period, select the offline database of each grid-connected photovoltaic power generation units match, from the offline database of described coupling, corresponding active power response curve is selected according to exerting oneself of each grid-connected photovoltaic power generation unit, when described transient state control module enables, according to active power response similarity, the active power response curve selected is carried out cluster to hive off, obtain multiple generating set group；
The concrete grammar that cluster is hived off when described transient state control module enables is as follows:
S3.1, if exerting oneself more than or equal to the first default power threshold of described grid-connected photovoltaic power generation unit, is divided into, by corresponding active power response curve, the generating set group that high-power operating mode is corresponding；
S3.2, if the exerting oneself less than the first default power threshold of described grid-connected photovoltaic power generation unit, and more than or equal to the second default power threshold, corresponding active power response curve is divided into the generating set group that middle power operating mode is corresponding；
S3.3, if exerting oneself less than the second default power threshold of described grid-connected photovoltaic power generation unit, is divided into, by corresponding active power response curve, the generating set group that small-power operating mode is corresponding。
Wherein, described first power threshold can be 0.7Pn, described second power threshold can be 0.4Pn, wherein, PnSpecified active power for photovoltaic generation unit。
It addition, when described transient state controls module disabling, whole photovoltaic plant can be divided into a generating set group。
After carrying out cluster and hiving off, also grouping result can be modified。Specifically, calculate the number of grid-connected photovoltaic power generation unit in each generating set group；If there is the quantity of grid-connected photovoltaic power generation unit in the first generating set group, less than default amount threshold, described first generating set group to be incorporated into the generating set group close with its operating condition。Wherein, described amount threshold can be set to the 5% of described grid-connected photovoltaic power generation unit sum。
After revising, the average active power output valve of each generating set group after also can calculating merging further；Generating set group after being combined according to the average active power output valve of adjacent generator group in the generating set group after merging merges again。Wherein, impose a condition if the difference of the average active power output valve of adjacent two generating set groups is satisfied in the generating set group after merging, it is judged that whether the generating set group after merging meets the constraints of Equivalent Modeling equivalence precision；
If meeting, in the generating set group after being combined, adjacent two generating set groups merge again；
Wherein, impose a condition described in as follows:
Δ P=Pavgi-Pavgj< 0.1Pn,
In formula, Δ P is the difference of adjacent two average active power output valves hived off, P in the generating set group after mergingavgiAnd PavgjIt is the average active power output valve of i-th generating set group after merging and the average active power output valve of jth generating set group after merging, P respectivelynSpecified active power for photovoltaic generation unit。
Wherein, the requirement of equivalent precision refers to the size allowing equivalent deviation of set up model, if equivalent deviation is 5%, 2%。When the permission equivalent deviation of Equivalent Modeling is bigger (being such as 5%), now above two groups of merging still can be met requirement, now can by two groups of merging；And when allowing equivalent deviation less (such as 2%), after now merging two groups, it is unsatisfactory for the requirement of equivalent deviation, now then nonjoinder。
S4, calculates the first equivalent parameters of each generating set group and the second equivalent parameters of corresponding current collection circuit, sets up the Equivalent Model of photovoltaic plant according to described first equivalent parameters and the second equivalent parameters。
Wherein, the calculating of the first equivalent parameters can use capacity weighting method, and the second equivalent parameters can obtain for principle calculating according to current collection line loss before and after equivalence is equal,
Least one set test intensity of illumination is set, select at least two abort situation point, according to described intensity of illumination and abort situation point, respectively the detailed model of described Equivalent Model and photovoltaic plant is carried out at the same conditions l-G simulation test, respectively obtain described Equivalent Model at also the first active power of output response curve of site, the first output reactive power response curve and described detailed model at also the second active power of output response curve of site, the second output reactive power response curve；Described first active power of output response curve and the second active power of output response curve are compared, first output reactive power response curve and the second output reactive power response curve are compared, determines the order of accuarcy of photovoltaic plant Equivalent Model according to comparative result。Wherein, described identical operating mode includes identical intensity of illumination, temperature, the Voltage Drop degree of depth and persistent period。
By the photovoltaic plant equivalent modeling method of the invention described above simulating, verifying in addition in following example。
Building 4 row 10 to arrange, the photovoltaic plant detailed model of totally 40 grid-connected photovoltaic power generation unit compositions, Fig. 6 is the structural representation of photovoltaic plant detailed model。In figure 6, it is the concrete structure of photovoltaic generation unit shown in broken box。40 photovoltaic generation unit models in photovoltaic plant are identical, photovoltaic generation unit can adopt machine one structure changes, the AC rated voltage of each grid-connected photovoltaic power generation unit can be set to 315V, PCC (the PointofCommonCoupling of photovoltaic plant can be connected to by unit booster transformer, points of common connection) place, rising to 110kV again through photovoltaic plant main transformer and realize grid-connected, between adjacent photovoltaic generator unit, current collection line length can be set to 0.2km。
After limiting respectively for active power regeneration rate after not considering failure removal and consider failure removal, two kinds of operating modes of active power regeneration rate restriction are discussed:
(1) operating condition that after not considering failure removal, active power regeneration rate limits:
Often row photovoltaic generation unit in the photovoltaic plant detailed model set up is numbered, draw near be followed successively by No. 1-10 according to distance site, respective intensity of illumination can be respectively set to 600,700,800,900,1000,600,700,800,900,1000W/m2。And the active power transient characterisitics response pattern that this operating condition is according to Fig. 4, it is possible to direct is an equivalent photovoltaic generation unit by whole photovoltaic plant equivalence, and equivalence intensity of illumination is 800W/m2。It is arranged on t=0.5s and three-phase shortcircuit occurs in site, earth resistance 0.2 Ω, t=0.7s failure removal, emulation obtain detailed model and Equivalent Model in this situation and the active power of site, reactive power and voltage, electric current to such as shown in Fig. 7 (a), Fig. 7 (b), Fig. 8 (a) and Fig. 8 (b)。By comparing the suitability according to active power response similarity, the photovoltaic plant that active power regeneration rate after not considering failure removal limits being carried out to Equivalent Modeling that can be seen that the present invention proposes。
(2) operating condition that after considering failure removal, active power regeneration rate limits:
Often row photovoltaic generation unit in set up photovoltaic plant detailed model is numbered, draw near be followed successively by No. 1-10 according to distance site, respective intensity of illumination can be respectively set to 300,250,200,230,900,950,1000,850,800,900W/m2。Under this operating condition, the active power transient response characteristic rule according to Fig. 5 can be seen that photovoltaic generation unit failure recovery time in different situations of exerting oneself there are differences, linear superposition relation it is unsatisfactory for, so now reply photovoltaic generation unit carries out hiving off equivalence during fault recovery。
Hiving off for the photovoltaic generation unit often arranged according to step S3.1 of the present invention, it can be seen that it is interval that No. 1-4 often arranged is under the jurisdiction of small-power operating mode, No. 5-10 is under the jurisdiction of high-power operating mode interval, thus can be divided into two groups；And the unit quantity in two groups is all higher than the 5% of unit sum, so in step S3.2 without being modified；The average intensity of illumination respectively 245W/m that two are hived off2、900W/m2, it is not belonging to two adjacent hiving off, so step S3.3 is again without being modified。Finally being divided into two groups according to equivalence method provided by the invention, if carrying out unit equivalence, then equivalence intensity of illumination is 638W/m2。It is arranged on t=0.5s and three-phase shortcircuit occurs in site, earth resistance 1.0 Ω, t=1.125s failure removal, emulation obtain detailed model and unit and two machine Equivalent Model in this situation the also active power of site, reactive power and voltage, electric current to such as shown in Fig. 9 (a), Fig. 9 (b), Figure 10 (a) and Figure 10 (b)。
When differing greatly when the input intensity of illumination of photovoltaic generation unit each in photovoltaic plant during by comparing and can be seen that active power regeneration rate restriction after considering failure removal, owing to during fault recovery, active power recovers the existence on slope, carry out unit equivalence during fault recovery, there is obvious errors, and use the equivalent modeling method based on active power response similarity of the present invention can obtain well equivalent effect。
The photovoltaic plant equivalent modeling method of the present invention has the advantage that
(1) consider the impact of actual light overhead utility active power regeneration rate restriction during fault recovery in the modelling phase of photovoltaic plant and it is embodied in control strategy, so that set up model has good engineering adaptability。
(2) the active power transient response curve of photovoltaic generation unit is obtained by the mode of off-line simulation, and set up offline database, by the active power transient response curve that the input intensity of illumination of on-line measurement photovoltaic generation unit, temperature, situation of exerting oneself and set end voltage situation are under each photovoltaic generation unit coupling corresponding state, carry out photovoltaic plant cluster and hive off。In this way, can effectively reduce online equivalent amount of calculation, improve equivalent efficiency。
(3) hiving off the stage in cluster, after completing preliminary equivalence, grouping result is implemented modified twice, in the scope that error allows, as far as possible minimizing is hived off quantity, thus realizing the Simplified equivalent model of maximum possible。
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded。
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent。It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention。Therefore, the protection domain of patent of the present invention should be as the criterion with claims。
Claims (10)
1. a photovoltaic plant equivalent modeling method, it is characterised in that comprise the following steps:
Setting up the grid-connected phantom of single grid-connected photovoltaic power generation unit, wherein, described grid-connected phantom includes arranging the transient state of the active power regeneration rate during fault recovery and controls module；
According to described grid-connected phantom, single grid-connected photovoltaic power generation unit is carried out fault simulation test, obtain the different Voltage Drop degree of depth and under the persistent period described grid-connected photovoltaic power generation unit and the active power response curve of site, the different Voltage Drop degree of depth and the active power response curve under the persistent period are respectively stored in corresponding offline database；Wherein, described photovoltaic electric station grid connection point is the points of common connection of each grid-connected photovoltaic power generation unit in photovoltaic plant；
The Voltage Drop degree of depth measured in real time according to photovoltaic plant and persistent period, select the offline database of each grid-connected photovoltaic power generation units match, from the offline database of described coupling, corresponding active power response curve is selected according to exerting oneself of each grid-connected photovoltaic power generation unit, when described transient state control module enables, according to active power response similarity, the active power response curve selected is carried out cluster to hive off, obtain multiple generating set group；
Calculate the first equivalent parameters of each generating set group and the second equivalent parameters of corresponding current collection circuit, set up the Equivalent Model of photovoltaic plant according to described first equivalent parameters and the second equivalent parameters。
2. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that obtain the different Voltage Drop degree of depth and under the persistent period described grid-connected photovoltaic power generation unit and the step of active power response curve of site include:
Type according to each grid-connected photovoltaic power generation unit sets minimum threshold and the max-thresholds of each grid-connected photovoltaic power generation unit operating condition respectively；
Obtain the different Voltage Drop degree of depth within the scope of from described minimum threshold to described max-thresholds and the persistent period described grid-connected photovoltaic power generation unit and the active power response curve of site。
3. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that according to active power response similarity, the active power response curve selected is clustered the step hived off and include:
If exerting oneself more than or equal to the first default power threshold of described grid-connected photovoltaic power generation unit, corresponding active power response curve is divided into the generating set group that high-power operating mode is corresponding；
If exerting oneself less than the first default power threshold of described grid-connected photovoltaic power generation unit, and more than or equal to the second default power threshold, corresponding active power response curve is divided into the generating set group that middle power operating mode is corresponding；
If exerting oneself less than the second default power threshold of described grid-connected photovoltaic power generation unit, corresponding active power response curve is divided into the generating set group that small-power operating mode is corresponding。
4. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that further comprising the steps of:
When described transient state controls module disabling, whole photovoltaic plant is divided into a generating set group。
5. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that hive off the active power response curve selected being carried out cluster according to active power response similarity, after obtaining multiple generating set group, further comprising the steps of:
Calculate the number of grid-connected photovoltaic power generation unit in each generating set group；
If there is the quantity of grid-connected photovoltaic power generation unit in the first generating set group, less than default amount threshold, described first generating set group to be incorporated into the generating set group close with its operating condition。
6. photovoltaic plant equivalent modeling method according to claim 5, it is characterised in that after described first generating set group is incorporated into the generating set group close with its operating condition, further comprising the steps of:
Calculate the average active power output valve of each generating set group after merging；
Generating set group after being combined according to the average active power output valve of adjacent generator group in the generating set group after merging merges again。
7. photovoltaic plant equivalent modeling method according to claim 6, it is characterised in that the step that the generating set group after being combined according to the average active power output valve of adjacent generator group after merging merges again includes:
Impose a condition if the difference of the average active power output valve of adjacent two generating set groups is satisfied in the generating set group after merging, it is judged that whether the generating set group after merging meets the constraints of Equivalent Modeling equivalence precision；
If meeting, in the generating set group after being combined, adjacent two generating set groups merge again；
Wherein, impose a condition described in as follows:
Δ P=Pavgi-Pavgj< 0.1Pn,
In formula, Δ P is the difference of adjacent two average active power output valves hived off, P in the generating set group after mergingavgiAnd PavgjIt is the average active power output valve of i-th generating set group after merging and the average active power output valve of jth generating set group after merging, P respectivelynSpecified active power for photovoltaic generation unit。
8. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that further comprising the steps of:
Least one set test intensity of illumination is set, select at least two abort situation point, according to described intensity of illumination and abort situation point, respectively the detailed model of described Equivalent Model and photovoltaic plant is carried out at the same conditions l-G simulation test, respectively obtain described Equivalent Model at also the first active power of output response curve of site, the first output reactive power response curve and described detailed model at also the second active power of output response curve of site, the second output reactive power response curve；
Described first active power of output response curve and the second active power of output response curve are compared, first output reactive power response curve and the second output reactive power response curve are compared, determines the order of accuarcy of photovoltaic plant Equivalent Model according to comparative result。
9. photovoltaic plant equivalent modeling method according to claim 1, it is characterized in that, described grid-connected phantom includes photovoltaic array, direct current junction station, direct current cables, inverter and the first control system thereof, discharging circuit and the second control system thereof, ac filter circuit model, booster transformer model and exchanges current collection circuit model。
10. photovoltaic plant equivalent modeling method according to claim 1, it is characterised in that the step of the active power regeneration rate during arranging fault recovery in described grid-connected phantom includes:
Active power recovery process during fault recovery is equivalent to linear function by the type according to grid-connected photovoltaic power generation unit；
Obtain the slope of described linear function；
Described slope is set to the active power regeneration rate during fault recovery。
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