CN105811432B - A kind of reactive compensation of photovoltaic access website determines method and apparatus - Google Patents
A kind of reactive compensation of photovoltaic access website determines method and apparatus Download PDFInfo
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- CN105811432B CN105811432B CN201610234473.7A CN201610234473A CN105811432B CN 105811432 B CN105811432 B CN 105811432B CN 201610234473 A CN201610234473 A CN 201610234473A CN 105811432 B CN105811432 B CN 105811432B
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- 230000008569 process Effects 0.000 claims abstract description 48
- 238000010248 power generation Methods 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000005286 illumination Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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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- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
A kind of reactive compensation of photovoltaic access website determines method, comprising: the reactive compensation capacity of setting photovoltaic access website；According to the initial reactive compensation capacity, whole process simulation simulation is carried out, whether the voltage fluctuation under the conditions of simulation photovoltaic power swing impact meets service requirement；The reactive compensation capacity is adjusted according to its analog result.In addition, a kind of reactive compensation determining device of photovoltaic access website is also provided herein.Using the above method and device, the operation risk of large-scale photovoltaic access system is reduced；Improve the ability that power grid resists Voltage Instability risk；Improve electricity net safety stable high-efficiency and economic operation level.
Description
Technical field
The invention belongs to field of power systems more particularly to a kind of reactive compensation of photovoltaic access website to determine method and dress
It sets.
Background technique
Increasingly exhausted fossil energy and the problem of environmental pollution got worse, have pushed the quick hair of renewable energy
Exhibition.Solar energy power generating is one of the important form of renewable energy development and utilization, has and cleans, is safe and convenient, efficient
The features such as, it is the effective way for solving energy crisis and environmental crisis.The western part such as China Qinghai, Xinjiang, Gansu and northern territory,
Solar energy resources very abundant will build the photovoltaic power generation base of multiple million kilowatts or even ten million multikilowatt according to planning.
Different from the normal power supplies such as thermoelectricity, water power, photovoltaic power generation has its differentiation feature.Firstly, dynamic from injecting power
It is seen on step response, the electrical power of photovoltaic cell Volta effect injection, the U-P characteristic curve determined by environment temperature and intensity of illumination
And DC operating voltage codetermines, the function of no normal power supplies governor dynamic regulation injecting power；Secondly, being rung from electrical
It answers and is seen in feature, the photovoltaic power generation kinetic characteristics that inertia constrains without spin, in the voltage based on all-controlling power electronics device
Under source inverter (voltage source converter, VSC) and its control system regulation, exchange and direct current tolerance
Quick response is to track target set point；Again, from grid-connected system design feature, it is different from normal power supplies large capacity concentration
Access is restricted by factors such as energy density and resource distributions, and large capacity photovoltaic plant is usually by numerous low capacity generator units
Collect composition, and the long distance line through boosting step by step accesses major network.After large-scale photovoltaic access, the dynamic behaviour and peace of power grid
Total stability, it will new feature is showed, for the correlative study in this field, it has also become the hot spot of current common concern.
Consider that the reactive compensation of the photovoltaic access website of photovoltaic power influence of fluctuations determines method therefore, it is necessary to further investigate, with most
Small cost guarantees system stable operation.
Summary of the invention
In view of this, not considering that photovoltaic power fluctuates shadow to solve the reactive compensation of photovoltaic access website in the prior art
Loud problem, the purpose of the present invention is to propose to a kind of reactive compensations of photovoltaic access website to determine method.For the reality to disclosure
The some aspects for applying example have a basic understanding, and simple summary is shown below.The summarized section is not extensive overview,
It is not intended to identify key/critical component or describes the protection scope of these embodiments.Its sole purpose is with simple shape
Some concepts are presented in formula, in this, as the preamble of following detailed description.
In some alternative embodiments, the reactive compensation of the photovoltaic access website determines method, comprising:
Set the reactive compensation capacity of photovoltaic access website；
According to the initial reactive compensation capacity, whole process simulation simulation is carried out, simulation photovoltaic power swing impacts condition
Under voltage fluctuation whether meet service requirement；
The reactive compensation capacity is adjusted according to its analog result.
Another object of the present invention is to provide a kind of reactive compensation determining device of photovoltaic access website；
In some alternative embodiments, the reactive compensation determining device of the photovoltaic access website, comprising:
Input unit, for setting the reactive compensation capacity of photovoltaic access website；
First analogue unit simulates photovoltaic for carrying out whole process simulation simulation according to the initial reactive compensation capacity
Whether the voltage fluctuation under the conditions of power swing impact meets service requirement；Wherein, in the process of whole process simulation simulation
In, it simulates the photovoltaic power and fluctuates to maximum value from minimum value again to the dynamic process of minimum value；
Adjustment unit, for being adjusted according to its analog result to the reactive compensation capacity.
Using above-described embodiment, following effect can reach:
Reduce the operation risk of large-scale photovoltaic access system；
Improve the ability that power grid resists Voltage Instability risk；
Improve electricity net safety stable high-efficiency and economic operation level.
For the above and related purposes, one or more embodiments include being particularly described below and in claim
In the feature that particularly points out.Certain illustrative aspects are described in detail in the following description and the annexed drawings, and its instruction is only
Some modes in the utilizable various modes of the principle of each embodiment.Other benefits and novel features will be under
The detailed description in face is considered in conjunction with the accompanying and becomes obvious, the disclosed embodiments be all such aspects to be included and they
Be equal.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
The reactive compensation that Fig. 1 shows a kind of photovoltaic access website of the embodiment of the present invention determines the process signal of method
Figure；
Fig. 2 is that a kind of reactive compensation of photovoltaic access website of the embodiment of the present invention determines that the process of method is schematic diagram；
Fig. 3 is the Qinghai Power Grid forcasted years structural schematic diagram in present example；
Fig. 4 is the photovoltaic simulation curve in present example；
Fig. 5 is in present example as intensity of illumination changes, and photovoltaic unit active power and reactive power fluctuation are imitative
True curve；
Fig. 6 is that the photovoltaic power of the assembling unit fluctuates the influence fluctuated to system voltage under original mode obtained in present example；
Fig. 7 is obtained in present example using a kind of nothing of photovoltaic access website for considering photovoltaic power influence of fluctuations
The photovoltaic power of the assembling unit fluctuates the influence fluctuated to system voltage under mode after the determining method of function compensation；
Fig. 8 shows a kind of functional structure of the reactive compensation determining device of photovoltaic access website of the present inventor's embodiment
Block diagram.
Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, these embodiments of the invention can individually or generally be indicated that this is only with term " invention "
For convenience, and if in fact disclosing the invention more than one, the range for being not meant to automatically limit the application is to appoint
What single invention or inventive concept.
The reactive compensation that Fig. 1 shows a kind of photovoltaic access website of the embodiment of the present invention determines the process signal of method
Figure；As shown in Figure 1, described method includes following steps:
Step S101 sets the reactive compensation capacity of photovoltaic access website；
Step S102 carries out whole process simulation simulation according to the initial reactive compensation capacity, simulates photovoltaic power swing
Whether the voltage fluctuation under the conditions of impact meets service requirement；
Step S103 is adjusted the reactive compensation capacity according to its analog result；
The reactive compensation that method described in above-described embodiment provides a kind of photovoltaic access website determines method, in this method
In for initial reactive compensation capacity scheme carry out whole process simulation simulation, in simulation process consider photovoltaic power fluctuation pair
The influence of voltage fluctuation is adjusted reactive compensation capacity further according to analog result, so that revised reactive compensation is held
Amount meets caused voltage fluctuation when photovoltaic power fluctuates and is no more than preset range；
Preferably, it is simulated in the whole process simulation specifically: simulate the photovoltaic power from minimum value fluctuation to maximum
Value arrives the dynamic process of minimum value again；
Further, before step S102, further includes:
Using reactive layered partition balancing as target, trend equilibrium analysis is carried out to the photovoltaic access website, and to described
Initial reactive compensation capacity is adjusted, and obtains the first reactive compensation capacity；
The whole process simulation simulation, specifically includes:
Whole process simulation simulation is carried out to first reactive compensation capacity, and it is adjusted according to its analog result
Obtain the second reactive compensation capacity；
Further, after step S102, further includes:
According to second reactive compensation capacity, Transient Voltage Stability check is carried out, and according to its analog result to described
Second reactive compensation capacity is adjusted, and obtains third reactive compensation capacity；
It is fed back the third reactive compensation capacity as recommendation reactive compensation capacity；
Preferably, the target of the reactive layered partition balancing specifically:
220kV and the above main transformer bet power factor in maximum load not less than 0.95, minimum load feelings
Power factor of betting under condition is not higher than 0.95.
Preferably, the service requirement specifically includes:
When public electric wire net voltage is in normal range (NR), sent out by the photovoltaic of 220kV and above access net
Stand, photo-voltaic power generation station grid entry point voltage should be able to be controlled in 100%~110% range of nominal voltage " and " 35kV or more
The sum of positive and negative absolute value of the bias of supply voltage is no more than the 10% of nominal voltage.
Preferably, introduce whether assessment single element meets electric system peace during the Transient Voltage Stability is checked
Full scleronomic constraint standard, the standard specifically:
After single element fault disturbance occurs for the electric system under normal operating mode, protection, switch and reclosing are correct
Stability contorting measure is not taken in movement, keeps the normal power supply of power system stability operation and electric system, and other elements do not surpass
Defined accident overload ability is crossed, successive trip does not occur.
Fig. 2 shows the process signals that the reactive compensation of one of embodiment of the present invention photovoltaic access website determines method
Figure；This method comprises the following steps:
(1) the initial reactive compensation capacity of photovoltaic access website is set；
(2) reactive layered partition balancing analysis is carried out to photovoltaic access website, by controlling power transformation device reactive compensation switching,
It gradually controls 220kV and the above main transformer power factor of bet in maximum load and is not less than 0.95, minimum load feelings
Power factor of betting under condition is not higher than 0.95, while should control each voltage class busbar voltage within the specified scope, so that it is determined that
The reactive compensation capacity tentative programme of photovoltaic access website；
(3) to scheme carry out whole course simulating computation consider photovoltaic power influence of fluctuations check, simulation photovoltaic power from
Minimum value fluctuates the dynamic process for arriving minimum value again to maximum value, determines when public electric wire net voltage is in normal range (NR), leads to
The photovoltaic hair station for crossing 220kV and above access net, should be able to control photo-voltaic power generation station grid entry point voltage in nominal electricity
In 100%~110% range of pressure, while being no more than nominally with the sum of 35kV and the positive and negative absolute value of the bias of the above supply voltage
The 10% of voltage is target, further adjusts the reactive compensation capacity of photovoltaic access website；
(4) transient state N-1/N-2 simulation analysis is carried out to scheme, running situation after simulation is broken down determines website
It is target that whether voltage, which meets service requirement, further adjusts the reactive compensation capacity of photovoltaic access website；
(5) arrange simultaneously meet (2), (3), (4) require photovoltaic access website reactive compensation capacity arrangements, work
For the reactive compensation capacity scheme of the photovoltaic access website of recommendation.
Preferably, following constraint is introduced: in the step (2) with " 220kV and the above main transformer are in maximum load feelings
Power factor of betting under condition is not less than 0.95, and bet power factor is target not higher than 0.95 " in the case of minimum load, and configuration becomes
Depressor reactive compensation capacity；
Preferably, following constraint is introduced in the step (3): with " when public electric wire net voltage is in normal range (NR),
Station is sent out by the photovoltaic of 220kV and above access net, photo-voltaic power generation station grid entry point voltage should be able to be controlled nominal
In 100%~110% range of voltage " and " the sum of 35kV and the positive and negative absolute value of the bias of the above supply voltage are no more than nominal electricity
The 10% " of pressure is target, in the dynamic that whole process simulation simulation photovoltaic power is fluctuated to minimum value again from minimum value to maximum value
Process, website voltage fluctuation under the conditions of simulation photovoltaic power swing impact；
Preferably, following constraint is introduced in the step (4): " electric power system stability is met with power system operation mode
Determine directive/guide " requirement, i.e., after single element fault disturbance occurs for electric system under normal operating mode, protection, switch and again
It closes a floodgate and correctly acts, do not take stability contorting measure, keep the normal power supply of power system stability operation and electric system, other
Element is no more than defined accident overload ability, and it is target that successive trip does not occur, and fault set in need of consideration includes: route
With the N-1 failure forever of transformer three；
Wherein, as can be seen from FIG. 2, during the adjustment, reactive compensation capacity adjusted should meet this adjustment ring simultaneously
The requirement of section and front adjustment link, that is, the value for ensuring finally to adjust while meeting all constraint links, if in certain adjustment link
In be unable to satisfy the requirement of the link, then situation is fed back into the first adjustment link, and readjust since the link idle
Compensation capacity.
Below with reference to Fig. 3-Fig. 7, by taking Qinghai Power Grid forcasted years typical way research as an example, to a kind of light of the present invention
The reactive compensation of volt access website determines that method further illustrates:
(1) Qinghai Power Grid research level year typical way structural schematic diagram is as shown in Figure 3；
(2) firstly, using reactive layered partition balancing as target, according to " 220kV and the above main transformer are in maximum load feelings
Power factor of betting under condition is not less than 0.95, and bet power factor is not higher than 0.95 " requirement in the case of minimum load, configures light
Lie prostrate the preliminary reactive compensation allocation plan of website；
(3) secondly, on the basis of the Scheme of Reactive Power Compensation that (2) determine, whole process simulation simulation photovoltaic power is carried out from most
Small value arrives the dynamic process of minimum value fluctuation to maximum value again, and whether voltage fluctuation is full under the conditions of simulation photovoltaic power swing impact
Sufficient service requirement, foundation " when public electric wire net voltage is in normal range (NR), passes through 220kV and above access net
Photovoltaic send out station, photo-voltaic power generation station grid entry point voltage should be able to be controlled in 100%~110% range of nominal voltage " and
" 10% of the sum of 35kV and the positive and negative absolute value of the bias of the above supply voltage no more than nominal voltage ", assessment photovoltaic website is idle
It compensates the reasonability of allocation plan and is modified perfect；
Simulation process is as shown in Figure 4, Figure 5, arrives weak variation again as intensity of illumination grows from weak to strong, and photovoltaic power is from minimum
It is worth maximum value and arrives minimum value again；
Intensity of illumination simulation process is as follows:
1) intensity of illumination 420s-840s is fluctuated from 8W/m2 to 930W/m2；
2) intensity of illumination 840s-1260s is fluctuated from 930W/m2 to 0W/m2.
As intensity of illumination changes, photovoltaic unit active power fluctuation situation is as follows:
1) 420s-840s photovoltaic unit active power is fluctuated from 0MW to 0.8MW；
2) 840s-1260s photovoltaic unit active power is fluctuated from 0.8MW to 0MW.
Photovoltaic unit active power experienced the process from minimum load fluctuation to maximum output from 420s-840s；From
840s-1260s experienced the process from maximum output fluctuation to minimum load；
The photovoltaic power of the assembling unit under former mode that Fig. 6 shows fluctuates the influence to access website voltage fluctuation, and Fig. 7, which is shown, to be examined
The reactive compensation for having considered the photovoltaic access website of photovoltaic power influence of fluctuations determines photovoltaic power of the assembling unit wave under the mode after method
The case where dynamic influence to access website voltage fluctuation, scheme adjusted as can be seen reduces voltage big ups and downs, more
Rationally；
(3) finally, it is steady to carry out transient voltage on the basis of the photovoltaic access website reactive compensation allocation plan that (2) determine
It is fixed to check, it assesses the reasonability of reactive compensation allocation plan and is modified perfect；Calculated result shows that most photovoltaics connect
The magnitude of a voltage fluctuation for entering website can satisfy service requirement, and there are fluctuating range mistakes for the magnitude of a voltage fluctuation of individual photovoltaic access websites
Greatly, it is discontented with the requirement of afc voltage range of operation, needs to adjust reactive compensation allocation plan, specific regulating measures are shown in Table 1
The reactive compensation determination side of the former mode of table 1 and the photovoltaic access website using a kind of consideration photovoltaic power influence of fluctuations
The adjustment contrast table that reactive compensation configures after method adjustment
By above-mentioned analysis of reactive power balance, transient voltage emulation and full dynamic simulation stability check, adaptation is proposed
The reactive compensation allocation plan of Qinghai Power Grid forcasted years can satisfy network voltage and flexibly control requirement, improves photovoltaic power
Lower voltage & var control ability is impacted in fluctuation, reduces investment, promotes the ability that power grid resists Voltage Instability risk.
Fig. 8 shows a kind of functional structure of the reactive compensation determining device of photovoltaic access website of the present inventor's embodiment
Block diagram.
In some alternative embodiments, the reactive compensation determining device 800 of the photovoltaic access website, comprising:
Input unit 801, for setting the reactive compensation capacity of photovoltaic access website；
First analogue unit 802, for carrying out whole process simulation simulation, simulation according to the initial reactive compensation capacity
Whether the voltage fluctuation under the conditions of photovoltaic power fluctuation impact meets service requirement, and according to its analog result to the idle benefit
Capacity is repaid to be adjusted；
Wherein, during the whole process simulation is simulated, the photovoltaic power is simulated from minimum value fluctuation to maximum
Value arrives the dynamic process of minimum value again；
In some alternative embodiments, described device 800, further includes:
Analytical unit 803, before carrying out whole process simulation simulation for first analogue unit 802, with reactive layered point
Area's balance is target, carries out trend equilibrium analysis to the photovoltaic access website, and carry out to the initial reactive compensation capacity
Adjustment obtains the first reactive compensation capacity；
First analogue unit 802, specifically includes:
First simulation subelement 8021, for carrying out whole process simulation simulation, and root to first reactive compensation capacity
It is adjusted according to its analog result and obtains the second reactive compensation capacity；
In some alternative embodiments, described device 800, further includes:
Second simulation subelement 804, after carrying out whole process simulation simulation for the first simulation subelement 8021, according to
Second reactive compensation capacity carries out Transient Voltage Stability check, and according to its analog result to second reactive compensation
Capacity is adjusted, and obtains third reactive compensation capacity；
Feedback unit 805, for being fed back the third reactive compensation capacity as recommendation reactive compensation capacity.
In conclusion collecting the reactive compensation configuration of website for photovoltaic using method and apparatus of the present invention
Problem can introduce whole process simulation and simulate photovoltaic power from minimum by the specificity analysis to pushing electric network outside large-scale photovoltaic
It is worth the fluctuation dynamic process that maximum value arrives minimum value again, whether voltage fluctuation meets under the conditions of simulation photovoltaic power swing impact
The constraint of service requirement, under conditions of meeting the requirement of N-1 after ensuring the system failure, so that reactive compensation allocation plan is more
Rationally.
It should also be appreciated by one skilled in the art that the foregoing is only a preferred embodiment of the present invention, it is not used to
The limitation present invention, for those skilled in the art, the invention may be variously modified and varied.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of reactive compensation of photovoltaic access website determines method characterized by comprising
Set the reactive compensation capacity of photovoltaic access website；
According to initial reactive compensation capacity, whole process simulation simulation, the voltage under the conditions of simulation photovoltaic power swing impact are carried out
Whether fluctuation meets service requirement；
The reactive compensation capacity is adjusted according to its analog result；
It is simulated in the whole process simulation specifically: simulate the photovoltaic power and fluctuate to maximum value from minimum value again to minimum value
Dynamic process；
The service requirement specifically includes:
When public electric wire net voltage is in normal range (NR), the photo-voltaic power generation station netted by 220kV and above access,
Photo-voltaic power generation station grid entry point voltage should be able to be controlled in 100%~110% range of nominal voltage and 35kV or more powers
The sum of positive and negative absolute value of the bias of voltage is no more than the 10% of nominal voltage；
Before whole process simulation simulation, further includes:
Using reactive layered partition balancing as target, trend equilibrium analysis is carried out to the photovoltaic access website, and to described initial
Reactive compensation capacity is adjusted, and obtains the first reactive compensation capacity；
The whole process simulation simulation, specifically includes:
Whole process simulation simulation is carried out to first reactive compensation capacity, and acquisition is adjusted to it according to its analog result
Second reactive compensation capacity；
After whole process simulation simulation, further includes:
According to second reactive compensation capacity, Transient Voltage Stability check is carried out, and according to its analog result to described second
Reactive compensation capacity is adjusted, and obtains third reactive compensation capacity；
It is fed back the third reactive compensation capacity as recommendation reactive compensation capacity.
2. the method as described in claim 1, which is characterized in that the target of the reactive layered partition balancing specifically:
220kV and the above main transformer bet power factor in maximum load not less than 0.95, in the case of minimum load
Power factor of betting is not higher than 0.95.
3. the method as described in claim 1, which is characterized in that it is single to introduce assessment during the Transient Voltage Stability is checked
Whether one element meets power system security scleronomic constraint standard, the standard specifically:
After single element fault disturbance occurs for the electric system under normal operating mode, protection, switch and reclosing are correctly acted,
Stability contorting measure is not taken, keeps the normal power supply of power system stability operation and electric system, and other elements are no more than rule
Fixed accident overload ability, does not occur successive trip.
4. a kind of reactive compensation determining device of photovoltaic access website characterized by comprising
Input unit, for setting the reactive compensation capacity of photovoltaic access website；
First analogue unit simulates photovoltaic power swing for carrying out whole process simulation simulation according to initial reactive compensation capacity
Whether the voltage fluctuation under the conditions of impact meets service requirement；Wherein, during the whole process simulation is simulated, institute is simulated
Photovoltaic power is stated to fluctuate to maximum value from minimum value again to the dynamic process of minimum value；
Adjustment unit, for being adjusted according to its analog result to the reactive compensation capacity；
Analytical unit, before carrying out whole process simulation simulation for first analogue unit, using reactive layered partition balancing as mesh
Mark carries out trend equilibrium analysis to the photovoltaic access website, and is adjusted to the initial reactive compensation capacity, obtains the
One reactive compensation capacity；
First analogue unit, specifically includes:
First simulation subelement, for carrying out whole process simulation simulation to first reactive compensation capacity, and according to its simulation
As a result it is adjusted and obtains the second reactive compensation capacity；
Second simulation subelement, after carrying out whole process simulation simulation for the first simulation subelement, according to second nothing
Function compensation capacity carries out Transient Voltage Stability check, and is adjusted according to its analog result to second reactive compensation capacity
It is whole, obtain third reactive compensation capacity；
Feedback unit, for being fed back the third reactive compensation capacity as recommendation reactive compensation capacity.
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