CN106340902B - A kind of adjusting method eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow - Google Patents
A kind of adjusting method eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow Download PDFInfo
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of adjusting methods eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow, belong to photo-voltaic power generation station voltage power-less automatic adjustment technology field.This method is when a regulating cycle arrives, first from each photovoltaic combining inverter of photo-voltaic power generation station locality monitoring system acquisition currently without work value, each collection electric wire of access same low-voltage bus bar and SVG currently without work value；Then, reactive circular power flow is judged：In the absence of reactive circular power flow, adjusting leaves it at that；In the presence of reactive circular power flow, determine the idle adjustment amount of elimination circulation, it determines the idle setting value and the idle setting values of SVG of every photovoltaic combining inverter under respective episode electric wire respectively according to idle adjustment amount, the setting value is finally issued into execution respectively, complete to adjust and next cycle is waited for arrive.The invention enables photo-voltaic power generation stations to there is SVG with can be eliminated in time during collection electric wire reactive circular power flow phenomenon, improves the economy of photo-voltaic power generation station operation.
Description
Technical field
The invention belongs to photo-voltaic power generation station voltage power-less automatic adjustment technology field, more particularly to a kind of elimination photovoltaic generation
Stand SVG with collect electric wire reactive circular power flow adjusting method.
Background technology
National standard GB/T19964-2012《Photo-voltaic power generation station access power system technology regulation》Regulation：The nothing of photo-voltaic power generation station
Work(power supply includes photovoltaic combining inverter and photo-voltaic power generation station reactive power compensator.Photo-voltaic power generation station will make full use of parallel network reverse
The reactive capability and its regulating power of device；When the reactive capability of inverter, which cannot meet system voltage, adjusts needs, Ying Guang
It lies prostrate power station and concentrates the reactive power compensator for installing suitable capacity additional, install dynamic reactive compensation device (SVG) additional when necessary.
The national standard it further provides that, by 10kV~35kV voltage class access power grid photo-voltaic power generation station in its idle output model
In enclosing, should have and idle output is adjusted according to photo-voltaic power generation station grid entry point voltage level, participate in the ability that network voltage is adjusted,
The parameters such as regulative mode and reference voltage, voltage permanent speed regulation should be by dispatching of power netwoks mechanism sets.By 110 (66) kV and to power on
Reactive voltage control system should be configured in the photo-voltaic power generation station of pressure grade access power grid, have reactive power adjusting and voltage control energy
Power.It is instructed according to dispatching of power netwoks mechanism, photo-voltaic power generation station automatically adjusts it and sends out the reactive power of (or absorption), realizes to grid-connected
The control of point voltage, governing speed and control accuracy should meet the requirement of power system voltage adjusting.
SVG is generally mounted on low-voltage bus bar by photo-voltaic power generation station, photovoltaic combining inverter access set after case becomes boosting
Electric wire (collection electric wire is the overhead transmission line or cable of the outlet of connection photovoltaic combining inverter and transformer in photo-voltaic power generation station),
And collect electric wire and finally also access low-voltage bus bar.In this case, it is possible that SVG and collection electric wire on low-voltage bus bar are idle different
Number, that is, SVG occur can be such that the active loss of the whole network significantly increases with collecting the reactive circular power flow phenomenon of electric wire, this reactive circular power flow, shadow
Ring the economical operation of photo-voltaic power generation station.
A kind of patent of invention " reactive circular power flow suppressing method of more single-phase electricities potential source type inverter parallel " (application publication number
CN104811074A, application number 2015101778999) there is idle ring between inverter when disclosing a kind of multi-inverter parallel
The suppressing method of stream.A kind of patent of invention " adjusting method for eliminating photo-voltaic power generation station across main transformer reactive circular power flow " (application publication number
CN105162132A, application number 2015105144032) disclose a kind of adjusting for eliminating photo-voltaic power generation station across main transformer reactive circular power flow
Method.About the technology that the reactive circular power flow phenomenon between SVG and collection electric wire is eliminated in photo-voltaic power generation station there is not yet open report.
Invention content
In place of to fill up the blank of prior art, a kind of elimination photo-voltaic power generation station SVG and collection are proposed
The adjusting method of electric wire reactive circular power flow.The method of the present invention can eliminate photo-voltaic power generation station SVG and collect the nothing occurred between electric wire in time
Work(circulation phenomenon so as to reduce network loss, improves the economy of photo-voltaic power generation station operation；Simultaneously because using adjusted stepwise and equivalent
The method of adjusting so that busbar voltage maintains smooth transition during entire adjust, and improves photo-voltaic power generation station operation
Safety and reliability.
A kind of adjusting method eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow proposed by the present invention, feature exist
In this method includes the following steps：
1) when a regulating cycle arrives, each photovoltaic combining inverter is obtained from photo-voltaic power generation station locality monitoring system
Currently without work value, each collection electric wire of access same low-voltage bus bar and SVG currently without work value；
SVG's is denoted as Q currently without work valuesvg；SVG Reactive-power control step-lengths are denoted as Qsvg_step；
It is all to be denoted as Q respectively without work value currently without N item collection electric wire of the work value more than 0i, i=1 ..., N, by all QiPhase
In addition and it is denoted as Q+, as shown in formula (1)：
It is all to be denoted as Q respectively without work value currently without M item collection electric wire of the work value less than 0k, k=1 ..., M, by all Qk's
Absolute value sum is denoted as Q-, as shown in formula (2)：
2) reactive circular power flow is judged；
If 2.1) QsvgMore than 0 and Q-Equal to 0, then show idle between SVG and collection electric wire under same low-voltage bus bar at this time
Circulation is not present, and without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
If 2.2) QsvgLess than 0 and Q+Equal to 0, then show idle between SVG and collection electric wire under same low-voltage bus bar at this time
Circulation is not present, and without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
If 2.3) QsvgMore than 0 and Q-Not equal to 0, then show that the part that SVG is sent out under same low-voltage bus bar at this time is idle
Collection electric wire has been flowed to, has formd reactive circular power flow, has been transferred to step 3)；
If 2.4) QsvgLess than 0 and Q+Not equal to 0, then show the part that same low-voltage bus bar next part electric wire is sent out at this time
It is idle to have flowed to SVG, reactive circular power flow is formd, is transferred to step 4)；
3) work as QsvgMore than 0 and Q-During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if
The photovoltaic combining inverter additional issue of all collection electric wire subordinaties currently without work value less than 0 is idle, while in order to keep grid entry point electric
The stabilization of pressure reduces SVG and sends out the idle of equivalent；It is as follows：
3.1) it sets and eliminates shown in the idle adjustment amount such as formula (3) of reactive circular power flow：
Qdelta=min { Qsvg, Q-, Qsvg_step} (3)
3.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value less than 0k_delta, k=1 ..., M, then：
Qk_delta=min | Qk|, Qdelta/M} (4)
Remember kth item currently without shared R under collection electric wire of the work value less than 0kA photovoltaic combining inverter, each photovoltaic DC-to-AC converter
Corresponding is Q currently without work valuek_j, k=1 ..., M, j=1 ..., Rk, the idle setting value note of each photovoltaic combining inverter
For Qk_j_set, k=1 ..., M, j=1 ..., Rk, then：
Qk_j_set=Qk_j+Qk_delta/Rk (5)
3.3) the idle setting values of SVG are set as Qsvg_set, then：
3.4) by the idle setting value Q of the SVG of step 3.3)svg_setWith the idle setting of photovoltaic combining inverter of step 3.2)
Value Qk_j_setIt is issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
4) work as QsvgLess than 0 and Q+During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if
All photovoltaic combining inverters currently without collection electric wire subordinate of the work value more than 0 are sent out idle less, while in order to keep grid entry point electric
The stabilization of pressure increases SVG and sends out the idle of equivalent；It is as follows：
4.1) it sets and eliminates shown in the idle adjustment amount such as formula (7) of reactive circular power flow：
Qdelta=min | Qsvg|, Q+, Qsvg_step} (7)
4.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value more than 0i_delta, i=1 ..., N, then：
Qi_delta=min | Qi|, Qdelta/N} (8)
Note i-th is currently without shared S under collection electric wire of the work value more than 0iA photovoltaic combining inverter, each photovoltaic DC-to-AC converter
It is corresponding currently without work value be Qi_j, i=1 ..., N, j=1 ..., Si, each photovoltaic combining inverter is idle, and setting value is denoted as
Qi_j_set, i=1 ..., N, j=1 ..., Si, then：
Qi_j_set=Qi_j-Qi_delta/Si (9)
4.3) the idle setting values of SVG are set as Qsvg_set, then：
4.4) by the idle setting value Q of the SVG of step 4.3)svg_setWith the idle setting of photovoltaic combining inverter of step 4.2)
Value Qi_j_setIt is issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
5) arrival of next regulating cycle is waited for, returns to step 1).
The characteristics of the method for the present invention and advantage are：
The present invention on the basis of photo-voltaic power generation station grid entry point voltage and photovoltaic combining inverter set end voltage are all qualified, when
When photo-voltaic power generation station occurs reactive circular power flow phenomenon occur between SVG and each collection electric wire under same busbar, by the way that two classes is divided to adjust
The idle setting value of each photovoltaic combining inverter and SVG, makes reactive circular power flow be eliminated in time, reduces circuit network loss,
Improve the economy of photo-voltaic power generation station operation；Simultaneously because the idle adjustment amount of photovoltaic combining inverter and SVG are adopted as far as possible
With the method that equivalent adjusts and the amplitude that the Reactive-power control step-length limitation of dynamic reactive compensation device is set to adjust every time, make
Grid entry point voltage maintains smooth transition during entire adjust, improve the safety of photo-voltaic power generation station operation and reliable
Property.
Specific embodiment
A kind of adjusting method eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow proposed by the present invention, with reference to
One specific embodiment is further described as follows.
A kind of adjusting method eliminated photo-voltaic power generation station SVG and collect electric wire reactive circular power flow proposed by the present invention, feature exist
In this method includes the following steps：
1) it when a regulating cycle (length of regulating cycle is 10 to 60 seconds, can be voluntarily configured) arrives, is sent out from photovoltaic
Monitoring system acquisition each photovoltaic combining inverter in power station locality collects electric wire currently without work value, each of access same low-voltage bus bar
With SVG currently without work value；
SVG's is denoted as Q currently without work valuesvg；SVG Reactive-power controls step-length (maximum permissible value of each Reactive-power controls of SVG) is remembered
For Qsvg_step；
It is all to divide currently without N item collection electric wire of the work value more than 0 without work value (i.e. idle to flow into low-voltage bus bar from collection electric wire)
Q is not denoted as iti(i=1 ..., N), by all QiSum is denoted as Q+, as shown in formula (1)：
It is all to divide currently without M item collection electric wire of the work value less than 0 without work value (i.e. idle to flow into collection electric wire from low-voltage bus bar)
Q is not denoted as itk(k=1 ..., M), by all QkAbsolute value sum be denoted as Q-, as shown in formula (2)：
2) reactive circular power flow is judged；
If 2.1) QsvgMore than 0 and Q-Equal to 0, then show idle between SVG and collection electric wire under same low-voltage bus bar at this time
Circulation is not present, and without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
If 2.2) QsvgLess than 0 and Q+Equal to 0, then show idle between SVG and collection electric wire under same low-voltage bus bar at this time
Circulation is not present, and without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
If 2.3) QsvgMore than 0 and Q-Not equal to 0, then show that the part that SVG is sent out under same low-voltage bus bar at this time is idle
Collection electric wire has been flowed to, has formd reactive circular power flow, has been transferred to step 3)；
If 2.4) QsvgLess than 0 and Q+Not equal to 0, then show the part that same low-voltage bus bar next part electric wire is sent out at this time
It is idle to have flowed to SVG, reactive circular power flow is formd, is transferred to step 4)；
3) work as QsvgMore than 0 and Q-During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if
The photovoltaic combining inverter additional issue of all collection electric wire subordinaties currently without work value less than 0 is idle, while in order to keep grid entry point electric
The stabilization of pressure reduces SVG and sends out the idle of equivalent；It is as follows：
3.1) it sets and eliminates shown in the idle adjustment amount such as formula (3) of reactive circular power flow：
Qdelta=min { Qsvg, Q-, Qsvg_step} (3)
3.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value less than 0k_delta(k=1 ..., M),
Then：
Qk_delta=min | Qk|, Qdelta/M} (4)
There are several photovoltaic combining inverters under each collection electric wire, note kth item is currently without under collection electric wire of the work value less than 0
Shared RkA photovoltaic combining inverter, corresponding to each photovoltaic DC-to-AC converter is Q currently without work valuek_j(k=1 ..., M, j=
1 ..., Rk), the idle setting value of each photovoltaic combining inverter is denoted as Qk_j_set(k=1 ..., M, j=1 ..., Rk), then：
Qk_j_set=Qk_j+Qk_delta/Rk (5)
3.3) the idle setting values of SVG are set as Qsvg_set, then：
3.4) by the idle setting value Q of SVGsvg_setWith the idle setting value Q of photovoltaic combining inverterk_j_set(k=1 ..., M, j
=1 ..., Rk) it being issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
4) work as QsvgLess than 0 and Q+During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if
All photovoltaic combining inverters currently without collection electric wire subordinate of the work value more than 0 are sent out idle less, while in order to keep grid entry point electric
The stabilization of pressure increases SVG and sends out the idle of equivalent；It is as follows：
4.1) it sets and eliminates shown in the idle adjustment amount such as formula (7) of reactive circular power flow：
Qdelta=min | Qsvg|, Q+, Qsvg_step} (7)
4.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value more than 0i_delta(i=1 ..., N),
Then：
Qi_delta=min | Qi|, Qdelta/N} (8)
There are several photovoltaic combining inverters under each collection electric wire, note i-th is currently without under collection electric wire of the work value more than 0
Shared SiA photovoltaic combining inverter, each photovoltaic DC-to-AC converter it is corresponding currently without work value be Qi_j(i=1 ..., N, j=1 ...,
Si), each photovoltaic combining inverter is idle, and setting value is denoted as Qi_j_set(i=1 ..., N, j=1 ..., Si), then：
Qi_j_set=Qi_j-Qi_delta/Si (9)
4.3) the idle setting values of SVG are set as Qsvg_set, then：
4.4) by the idle setting value Q of SVGsvg_setWith the idle setting value Q of photovoltaic combining inverteri_j_set(i=1 ..., N, j
=1 ..., Si) it being issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
5) arrival of next regulating cycle is waited for, returns to step 1).
What deserves to be explained is this method point multistep in the presence of reactive circular power flow is adjusted；One regulating cycle is not
Centainly with regard to that can completely eliminate reactive circular power flow, may also pass through the adjusting repeatedly of multiple regulating cycles can just completely eliminate.
The photo-voltaic power generation station installed capacity of the present embodiment is 50MW (100 0.5MW photovoltaic combining inverters), and high pressure list is female
Line is 110kV, low-voltage bus bar 35kV, and one group of dynamic reactive compensation device is equipped under low-voltage bus bar, and capacity is ± 10MVar,
There are 5 collection electric wires under low-voltage bus bar, every collection electric wire is equipped with 20 photovoltaic combining inverters, employs proposed by the present invention
It is 30 seconds that photo-voltaic power generation station SVG, which is eliminated, with collecting the adjusting method of electric wire reactive circular power flow reactive circular power flow, regulating cycle, SVG is idle tune
Section step-length is 1MVar, and specific adjusting process includes the following steps：
1-1) (37 divide 10 seconds during 14 days 11 July in 2016, first regulating cycle) is obtained from photovoltaic power station monitoring system
Take #1~#5 collection electric wires currently without work value be respectively 1.30MVar, 2.31MVar, 1.47MVar, 1.04MVar ,-
1.56MVar, SVG are 2.19MVar currently without work value, and 110kV busbar voltages are 114.26kV；
It is cumulative it is all be more than 0 and integrate the idle value summation of electric wire as 6.12MVar, add up it is all be less than 0 the idle value of collection electric wire
Absolute value summation be 1.56MVar；
1-2) since SVG currently without work value is more than 0 for 2.19MVar, and it is cumulative it is all be less than 0 the idle value of collection electric wire
Absolute value summation be 1.56MVar not equal to 0, show that the part of SVG is idle and flowed to #5 collection electric wires, there are reactive circular power flows, need
Eliminate the Reactive-power control of circulation, that is, reduce idle the reducing simultaneously of the photovoltaic combining inverter absorption of collection electric wire subordinate
SVG is sent out idle；
1-3) the idle adjustment amounts of SVG are min { 2.19,1.56,1 }=1MVar；
#5 integrates the idle adjustment amount of electric wire as min { 1.56,1 }=1MVar；
20 photovoltaic combining inverters of #5 collection electric wires subordinate, each idle adjustment amount of photovoltaic combining inverter is 1/20=
0.05MVar；
20 photovoltaic combining inverters of #5 collection electric wires subordinate are respectively (unit MVar) currently without work value：
-0.08、-0.09、-0.07、-0.10、-0.02、-0.11、-0.11、-0.07、-0.09、-0.07、
-0.09、-0.10、-0.06、-0.05、-0.12、-0.11、-0.06、-0.10、-0.07、-0.11；
It is respectively (unit MVar) that then epicycle, which adjusts 20 idle setting values of photovoltaic combining inverter of #5 collection electric wires subordinate,：
-0.03、-0.04、-0.03、-0.06、0.03、-0.06、-0.06、-0.02、-0.04、-0.02、
-0.04、-0.05、-0.01、-0.00、-0.07、-0.06、-0.01、-0.05、-0.02、-0.06；
It is 2.19-1=1.19MVar that epicycle, which adjusts the idle setting values of SVG,；
The idle setting values of SVG and the idle setting value of photovoltaic combining inverter are issued to SVG and each grid-connected inverse respectively
Become device to be performed, epicycle adjusting leaves it at that.
2-1) (37 divide 40 seconds during 14 days 11 July in 2016, second regulating cycle) is obtained from photovoltaic power station monitoring system
Take #1~#5 collection electric wires currently without work value be respectively 1.23MVar, 2.26MVar, 1.45MVar, 1.03MVar ,-
0.63MVar, SVG are 1.13MVar currently without work value, and 110kV busbar voltages are 114.22kV；
It is cumulative it is all be more than 0 and integrate the idle value summation of electric wire as 5.97MVar, add up it is all be less than 0 the idle value of collection electric wire
Absolute value summation be 0.63MVar；
2-2) since SVG currently without work value is more than 0 for 1.13MVar, and it is cumulative it is all be less than 0 the idle value of collection electric wire
Absolute value summation be 0.63MVar not equal to 0, show that the part of SVG is idle and flowed to #5 collection electric wires, there are reactive circular power flows, need
Eliminate the Reactive-power control of circulation, that is, reduce idle the reducing simultaneously of the photovoltaic combining inverter absorption of collection electric wire subordinate
SVG is sent out idle；
2-3) the idle adjustment amounts of SVG are min { 1.13,0.63,1 }=0.63MVar；
#5 integrates the idle adjustment amount of electric wire as min { 0.63,0.63/1 }=0.63MVar；
20 photovoltaic combining inverters of #5 collection electric wires subordinate, each idle adjustment amount of photovoltaic DC-to-AC converter is 0.63/20=
0.03MVar；
20 photovoltaic combining inverters of #5 collection electric wires subordinate are respectively (unit MVar) currently without work value：
-0.03、-0.04、-0.03、-0.06、0.03、-0.06、-0.06、-0.02、-0.04、-0.02、
-0.04、-0.05、-0.01、-0.00、-0.07、-0.06、-0.01、-0.05、-0.02、-0.06；
It is respectively (unit MVar) that then epicycle, which adjusts 20 idle setting values of photovoltaic combining inverter of #5 collection electric wires subordinate,：
0.00、-0.01、0.00、-0.03、0.06、-0.03、-0.03、0.01、-0.01、0.01、
-0.01、-0.02、0.02、0.03、-0.04、-0.03、0.02、-0.02、0.01、-0.03；
It is 1.13-0.63=0.5MVar that epicycle, which adjusts the idle setting values of SVG,；
The idle setting values of SVG and the idle setting value of photovoltaic combining inverter are issued to SVG and each grid-connected inverse respectively
Become device to be performed, epicycle adjusting leaves it at that.
3-1) (38 divide 10 seconds during 14 days 11 July in 2016, third regulating cycle) is obtained from photovoltaic power station monitoring system
Take #1~#5 collection electric wires is respectively 1.29MVar, 2.33MVar, 1.40MVar, 1.12MVar, 0.06MVar currently without work value,
SVG is 0.44MVar currently without work value, and 110kV busbar voltages are 114.29kV；
It is cumulative it is all be more than 0 and integrate the idle value summation of electric wire as 6.2MVar, add up it is all be less than 0 the idle value of collection electric wire
Absolute value summation is 0MVar；
3-2) since SVG currently without work value is more than 0 for 0.44MVar, and it is cumulative it is all be less than 0 the idle value of collection electric wire
Summation is 0, shows that the idle of no SVG flows to any collection electric wire, and there is no reactive circular power flow, epicycle need not carry out eliminating circulation
Reactive-power control.
4) arrival of next regulating cycle is waited for.
From above-described embodiment as can be seen that employing a kind of elimination photo-voltaic power generation station SVG proposed by the present invention and collection electric wire
After the adjusting method of reactive circular power flow, adjusted from the execution first round is started to reactive circular power flow elimination 2 wheel adjusting of progress altogether, take 1
Minute.#5 collection electric wire switchs to positive value with the idle outputs of SVG on the contrary, #5 collection electric wires are idle after adjusting before adjusting, and SVG is idle to be intended to
0, therefore the Reactive-power control nargin of SVG increases while reactive circular power flow elimination, is conducive to system stabilization.It is all adopted since every wheel is adjusted
The method adjusted with equivalent, that is, flow into the idle decrement of low-voltage bus bar and be equal to the idle decrement of outflow low-voltage bus bar,
So that grid entry point is idle summarize after change it is little.In addition SVG single Reactive-power controls amount is walked using the adjusting no more than 1MVar
Photo-voltaic power generation station grid entry point 110kV voltage changes are smaller during long, the idle amount adjusted every time is all smaller, therefore two-wheeled is adjusted,
Overall adjustment effect is preferable.
Claims (1)
1. it is a kind of eliminate photo-voltaic power generation station SVG with collect electric wire reactive circular power flow adjusting method, which is characterized in that this method include with
Lower step：
1) when a regulating cycle arrives, the current of each photovoltaic combining inverter is obtained from photo-voltaic power generation station locality monitoring system
No work value, each collection electric wire of access same low-voltage bus bar and SVG currently without work value；
SVG's is denoted as Q currently without work valuesvg；SVG Reactive-power control step-lengths are denoted as Qsvg_step；
It is all to be denoted as Q respectively without work value currently without N item collection electric wire of the work value more than 0i, i=1 ..., N, by all QiMutually in addition
Be denoted as Q+, as shown in formula (1)：
It is all to be denoted as Q respectively without work value currently without M item collection electric wire of the work value less than 0k, k=1 ..., M, by all QkIt is absolute
Value sum is denoted as Q-, as shown in formula (2)：
2) reactive circular power flow is judged；
If 2.1) QsvgMore than 0 and Q-Equal to 0, then show SVG under same low-voltage bus bar at this time and collect reactive circular power flow between electric wire
It is not present, without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
2.2) if QsvgLess than 0 and Q+Equal to 0, then show SVG under same low-voltage bus bar at this time and collect reactive circular power flow between electric wire
It is not present, without eliminating the Reactive-power control of circulation, adjusting leaves it at that；
If 2.3) QsvgMore than 0 and Q-Not equal to 0, then show the idle flow direction in part that SVG is sent out under same low-voltage bus bar at this time
Collection electric wire, forms reactive circular power flow, is transferred to step 3)；
If 2.4) QsvgLess than 0 and Q+Not equal to 0, then show the idle stream in part that same low-voltage bus bar next part electric wire is sent out at this time
To SVG, reactive circular power flow is formd, is transferred to step 4)；
3) work as QsvgMore than 0 and Q-During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if all work as
The photovoltaic combining inverter additional issue of collection electric wire subordinate of the preceding no work value less than 0 is idle, while in order to keep the steady of grid entry point voltage
It is fixed, it reduces SVG and sends out the idle of equivalent；It is as follows：
3.1) it sets and eliminates shown in the idle adjustment amount such as formula (3) of reactive circular power flow：
Qdelta=min { Qsvg, Q-, Qsvg_step} (3)
3.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value less than 0k_delta, k=1 ..., M, then：
Qk_delta=min | Qk|, Qdelta/M} (4)
Remember kth item currently without shared R under collection electric wire of the work value less than 0kA photovoltaic combining inverter, each photovoltaic combining inverter
Corresponding is Q currently without work valuek_j, k=1 ..., M, j=1 ..., Rk, the idle setting value note of each photovoltaic combining inverter
For Qk_j_set, k=1 ..., M, j=1 ..., Rk, then：
Qk_j_set=Qk_j+Qk_delta/Rk (5)
3.3) the idle setting values of SVG are set as Qsvg_set, then：
3.4) by the idle setting value Q of the SVG of step 3.3)svg_setWith the idle setting value of photovoltaic combining inverter of step 3.2)
Qk_j_setIt is issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
4) work as QsvgLess than 0 and Q+During not equal to 0, reactive circular power flow exists, then carries out eliminating the Reactive-power control of circulation, even if all work as
The photovoltaic combining inverter of collection electric wire subordinate of the preceding no work value more than 0 is sent out idle, while in order to keep the steady of grid entry point voltage less
It is fixed, increase SVG and send out the idle of equivalent；It is as follows：
4.1) it sets and eliminates shown in the idle adjustment amount such as formula (7) of reactive circular power flow：
Qdelta=min | Qsvg|, Q+, Qsvg_step} (7)
4.2) it sets and is denoted as Q currently without each collection electric wire idle adjustment amount of the work value more than 0i_delta, i=1 ..., N, then：
Qi_delta=min | Qi|, Qdelta/N} (8)
Note i-th is currently without shared S under collection electric wire of the work value more than 0iA photovoltaic combining inverter, each photovoltaic combining inverter
It is corresponding currently without work value be Qi_j, i=1 ..., N, j=1 ..., Si, each photovoltaic combining inverter is idle, and setting value is denoted as
Qi_j_set, i=1 ..., N, j=1 ..., Si, then：
Qi_j_set=Qi_j-Qi_delta/Si (9)
4.3) the idle setting values of SVG are set as Qsvg_set, then：
4.4) by the idle setting value Q of the SVG of step 4.3)svg_setWith the idle setting value of photovoltaic combining inverter of step 4.2)
Qi_j_setIt is issued to SVG respectively and each photovoltaic combining inverter is performed, adjusting leaves it at that；
5) arrival of next regulating cycle is waited for, returns to step 1).
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| CN104811074A (en) * | 2015-04-15 | 2015-07-29 | 西安理工大学 | Reactive circulating current restraining method for multiple parallel single-phase voltage source inverters |
| CN105162132A (en) * | 2015-08-20 | 2015-12-16 | 国家电网公司 | Adjustment method for removing main transformer-crossing reactive circular power flow of photovoltaic power station |
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| CN105162132A (en) * | 2015-08-20 | 2015-12-16 | 国家电网公司 | Adjustment method for removing main transformer-crossing reactive circular power flow of photovoltaic power station |
| CN105281342A (en) * | 2015-10-26 | 2016-01-27 | 海南电网有限责任公司 | Photovoltaic power station reactive distribution method for preferably guaranteeing dynamic reactive margin |
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