CN103904681A - High-power centralized type grid-connected photovoltaic power generation coordinated control system and method - Google Patents
High-power centralized type grid-connected photovoltaic power generation coordinated control system and method Download PDFInfo
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- CN103904681A CN103904681A CN201410088032.1A CN201410088032A CN103904681A CN 103904681 A CN103904681 A CN 103904681A CN 201410088032 A CN201410088032 A CN 201410088032A CN 103904681 A CN103904681 A CN 103904681A
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Abstract
The invention discloses a high-power centralized type grid-connected photovoltaic power generation coordinated control system. The high-power centralized type grid-connected photovoltaic power generation coordinated control system structurally comprises a small-capacity auxiliary power inverter and one or more slave inverters with the same capacity. The input ends and the output ends of the inverters are connected in parallel. The auxiliary power inverter serves as a host, is named as a master inverter, and has the grid-connected power generation mode and the harmonic compensation mode. Each slave inverter serves as a slave machine and only has the grid-connected power generation mode. The invention further discloses a high-power centralized type grid-connected photovoltaic power generation coordinated control method. The master inverter is used for distribution of working modes and capacity of the master inverter and the slave inverters. The high-power centralized type grid-connected photovoltaic power generation coordinated control system and method are combined for use, and the problem that THD of the grid-connected current exceeds 5% when the high-power centralized type grid-connected photovoltaic power generation coordinated control system is under the dim light situation is well solved.
Description
Technical field
The invention belongs to solar photovoltaic technology field, relate to a kind of high-power centralized parallel network power generation coordinated control system, the invention still further relates to a kind of high-power centralized parallel network power generation control method for coordinating.
Background technology
Solar energy power generating is as the important component part of generation of electricity by new energy; alleviating energy crisis is played a part positive; and high-power centralized parallel network power generation coordinated control system is as the principal mode of photovoltaic generating system; the quality of its grid-connected electric energy has a significant impact the quality of power supply of large electrical network; therefore standard GB/T/T19939-2005 also has certain requirement to the grid-connected current harmonic wave of grid-connected photovoltaic system, wherein one be total harmonic current should be less than inverter output-current rating 5%.
The strict demand to grid-connected current harmonic wave existing for high-power centralized photovoltaic grid-connected generating control system, existing high-power centralized photovoltaic grid-connected generating control system adopts the intelligent host-guest architecture of two or more combining inverter parallel connections conventionally, the real output of its control system real time monitoring photovoltaic array, thereby the inverter quantity that determines to need input, has improved device efficiency and equipment redundancy.Because inverter puts into operation according to photovoltaic array real output, the grid-connected current harmonic wave that inverter produces decreases, so can partly suppress the grid-connected current harmonic wave of system, and real system is that grid-connected current THD in the less situation of photovoltaic array real output also can exceed 5% at the low light level, this can have a negative impact to the quality of power supply of large electrical network, and its scale is larger, adverse effect is also just larger, and this will inevitably hinder the further application of high-power centralized photovoltaic grid-connected generating control system in photovoltaic plant.
Summary of the invention
The object of this invention is to provide a kind of high-power centralized parallel network power generation coordinated control system, solved high-power centralized photovoltaic grid-connected generating control system in prior art, in low light level situation, grid-connected current THD exceedes 5% problem.
Another object of the present invention is to provide a kind of high-power centralized parallel network power generation control method for coordinating.
The technical solution used in the present invention is, a kind of high-power centralized parallel network power generation coordinated control system comprises that a main inverter and at least one are from inverter, and main inverter is as main frame, each from inverter all as slave.Main inverter and Ge Tai are from communicating by CAN bus between inverter.Main inverter has less capacity, has the pattern of generating electricity by way of merging two or more grid systems and harmonic wave compensation model concurrently, is to require there is identical capacity when more than two, and only has the pattern of generating electricity by way of merging two or more grid systems from inverter quantity.
Another technical scheme that the present invention adopts is that a kind of high-power centralized parallel network power generation control method for coordinating, depends on above-mentioned coordinated control system, implements in such a way to coordinate to control:
1) situation that photovoltaic array real output increases
The initial condition of supposing the system is stopped status
Be greater than 5% from inverter one rated output power and be less than from the optimal proportion B of inverter one rated output power if photovoltaic array real output is increased to, system starts, harmonic wave suppresses contactor closure, grid-connected contactor closure, main inverter is operated in the pattern of generating electricity by way of merging two or more grid systems, now the grid-connected current of main inverter can meet the requirement of THD<5%, from inverter one, all quit work from inverter two with from inverter three
Be greater than from the optimal proportion B of inverter one rated output power and be less than from the optimal proportion A of inverter one rated output power if photovoltaic array real output continues to be increased to, main inverter is worked from inverter one by CAN bus line command, grid-connected contactor one closure, bear whole photovoltaic array real outputs from inverter one, now can not meet the requirement of THD<5% from the grid-connected current of inverter one, so suppressing contactor, harmonic wave disconnects, main inverter is switched to harmonic compensation pattern, with from inverter one by way of compensation object carry out active power filtering, make harmonic current only at main inverter with from flowing between inverter one, thereby reduce to flow into the harmonic current of electrical network, make the total grid-connected current after compensation reach the requirement of THD<5%,
Be greater than from the optimal proportion A of inverter one rated output power and be less than from inverter one rated output power if photovoltaic array real output continues to be increased to, although now can meet the requirement of THD<5% from the grid-connected current of inverter one, in order to obtain the better quality of power supply, main inverter is still operated in harmonic compensation pattern
If photovoltaic array real output continue to be increased to be greater than from inverter one rated output power and be less than twice from inverter one rated output power, main inverter is worked from inverter two by CAN bus line command, grid-connected contactor two closures, photovoltaic array real output is averagely allocated to from inverter one with from inverter two again, although now from inverter one with can meet the requirement of THD<5% from total grid-connected current of inverter two, in order to obtain the better quality of power supply, main inverter is still operated in harmonic compensation pattern
If photovoltaic array real output continue to be increased to be greater than twice from inverter one rated output power and be less than three times from inverter one rated output power, main inverter is worked from inverter three by CAN bus line command, grid-connected contactor three closures, again photovoltaic array real output is averagely allocated to from inverter one, from inverter two with from inverter three, now from inverter one, although from inverter two with can meet the requirement of THD<5% from total grid-connected current of inverter three, in order to obtain the better quality of power supply, main inverter is still operated in harmonic compensation pattern,
If from inverter more than three, other are from the working method of inverter and similar from the working method of inverter three;
2) situation that photovoltaic array real output reduces
The initial condition of supposing the system is for all to work from inverter one, from inverter two with from inverter three, and main inverter is operated in harmonic compensation pattern,
If photovoltaic array real output be reduced to be greater than from inverter one rated output power and be less than twice from inverter one rated output power, main inverter is averagely allocated to photovoltaic array real output from inverter one with from inverter two by CAN bus, order again from inverter three and quit work, grid-connected contactor three disconnects, although now from inverter one with can meet the requirement of THD<5% from total grid-connected current of inverter two, in order to obtain the better quality of power supply, main inverter is still operated in harmonic compensation pattern
Be greater than from the optimal proportion A of inverter one rated output power and be less than from inverter one rated output power if photovoltaic array real output continues to be reduced to, main inverter is born whole photovoltaic array real outputs by CAN bus line command from inverter one, order again from inverter two and quit work, grid-connected contactor two disconnects, although now can meet the requirement of THD<5% from the grid-connected current of inverter one, in order to obtain the better quality of power supply, main inverter is still operated in harmonic compensation pattern
Be greater than from the optimal proportion B of inverter one rated output power and be less than from the optimal proportion A of inverter one rated output power if photovoltaic array real output continues to be reduced to, now can not meet the requirement of THD<5% from the grid-connected current of inverter one, so main inverter is operated in harmonic compensation pattern, with from inverter one by way of compensation object carry out active power filtering, make harmonic current only between inverter one and main inverter flow, thereby reduce to flow into the harmonic current of electrical network, make the total grid-connected current after compensation reach the requirement of THD<5%,
Be greater than 5% from inverter one rated output power and be less than from the optimal proportion B of inverter one rated output power if photovoltaic array real output continues to be reduced to, now the grid-connected current from inverter one compensation can not meet the requirement of THD<5%, so main inverter is switched to the pattern of generating electricity by way of merging two or more grid systems, harmonic wave suppresses contactor closure, main inverter is born whole photovoltaic array real outputs, quit work from inverter one by CAN bus line command again, grid-connected contactor one disconnects, now the grid-connected current of main inverter can meet the requirement of THD<5%,
Be less than 5% from inverter one rated output power if photovoltaic array real output continues to be reduced to, now photovoltaic array real output is very little, and whole system is shut down, and grid-connected contactor disconnects.
The invention has the beneficial effects as follows, the existing structure structures from inverter parallel that adopt many same capabilities more, the present invention is by increasing the auxiliary power inverter of a low capacity, as main frame, be called main inverter, each need not change from the original concrete control method of inverter, as slave, be called from inverter, main inverter is responsible for main inverter and Ge Tai distributes from mode of operation and the capacity of inverter, realize the coordination control between all inverters, well solve high-power centralized photovoltaic grid-connected generating control system grid-connected current THD in low light level situation and exceeded 5% problem.
Accompanying drawing explanation
Fig. 1 is the structural representation of coordinated control system embodiment of the present invention.
In figure, 1. photovoltaic array, 2. main counnter attack diode, 3. main DC capacitor, 4. main inverter, 5. senior filter, 6. leads grid-connected contactor, 7. isolating transformer, 8. electrical network, 9. harmonic wave suppresses contactor,
21. counnter attack diode one, 22. counnter attack diode two, 23. counnter attack diodes three,
31. DC capacitor one, 32. DC capacitor two, 33. DC capacitors three,
41. from inverter one, 42. from inverter two, 43. from inverter three,
51. filter one, 52. filter two, 53. filters three,
The grid-connected contactor three of the grid-connected contactor two, 63. of 61. grid-connected contactor one, 62..
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
With reference to Fig. 1, in implementation process take a main frame and three slave combining structures as example, main frame and three slaves are specially: auxiliary power inverter is the main inverter 4 in Fig. 1, from inverter be Fig. 1 from inverter 1, from inverter 2 42 with from inverter 3 43.
The input of main inverter 4 successively by harmonic wave suppress contactor 9, main counnter attack diode 2 is connected with photovoltaic array 1, between two inputs of main inverter 4, be parallel with in addition main DC capacitor 3, the output of main inverter 4 is connected with electrical network 8 by senior filter 5, main grid-connected contactor 6, isolating transformer 7 successively.
Be connected with photovoltaic array 1 by counnter attack diode 1 successively from the input of inverter 1, between two inputs of inverter 1, be parallel with in addition DC capacitor 1, be connected with electrical network 8 by filter 1, grid-connected contactor 1, isolating transformer 7 successively from the output of inverter 1.
Be connected with photovoltaic array 1 by counnter attack diode 2 22 successively from the input of inverter 2 42, between two inputs of inverter 2 42, be parallel with in addition DC capacitor 2 32, be connected with electrical network 8 by filter 2 52, grid-connected contactor 2 62, isolating transformer 7 successively from the output of inverter 2 42.
Be connected with photovoltaic array 1 by counnter attack diode 3 23 successively from the input of inverter 3 43, between two inputs of inverter 3 43, be parallel with in addition DC capacitor 3 33, be connected with electrical network 8 by filter 3 53, grid-connected contactor 3 63, isolating transformer 7 successively from the output of inverter 3 43.
Main inverter 4 has the pattern of generating electricity by way of merging two or more grid systems and harmonic wave compensation model concurrently, from inverter 1～have the pattern of generating electricity by way of merging two or more grid systems from 3 43 of inverters.Main inverter 4 and from inverter 1～be two level structures or three level structures from the circuit topology of inverter 43.Main inverter 4 adopts single inductor filter, from inverter 1～adopt single inductor filter or LCL filtering from inverter 3 43.From 5 times of inverter 1～be all from inverter 3 43 rated capacities main inverter 4 rated capacities.Main inverter and each be from communicating by CAN bus between inverter, and main inverter 4 is as main frame, and from inverter 1～from inverter 3 43, all as slave, main inverter 4 is responsible for main inverter and each the mode of operation from inverter and capacity distribution.
Control method for coordinating of the present invention, depends on above-mentioned coordinated control system, take structure shown in Fig. 1 as example, specifically controls according to following process:
1) situation that photovoltaic array real output increases
The initial condition of supposing the system is stopped status.
If being increased to be greater than 5% from inverter one 41 rated output powers and to be less than from the optimal proportion B(of inverter one 41 rated output powers, photovoltaic array 1 real output for example sets B=20% from inverter one 41 rated output powers), system starts, because all contactors before starting are all in off-state, so harmonic wave suppresses contactor 9 closures, grid-connected contactor 6 closures, main inverter 4 is operated in the pattern of generating electricity by way of merging two or more grid systems, now the grid-connected current of main inverter 4 can meet the requirement of THD<5%, from inverter 1, all quit work from inverter 2 42 with from inverter 3 43.
If continuing to be increased to be greater than from the optimal proportion B of inverter one 41 rated output powers and to be less than from the optimal proportion A(of inverter one 41 rated output powers, photovoltaic array 1 real output for example sets A=50% from inverter one 41 rated output powers), main inverter 4 is worked from inverter 1 by CAN bus line command, grid-connected contactor one 61 closures, bear whole photovoltaic array 1 real outputs from inverter 1, now can not meet the requirement of THD<5% from the grid-connected current of inverter 1, so suppressing contactor 9, harmonic wave disconnects, main inverter 4 is switched to harmonic compensation pattern, with from inverter 1 by way of compensation object carry out active power filtering, make harmonic current only (produce harmonic current from inverter 1 at main inverter 4 with from flowing between inverter 41, main inverter 4 absorbs this harmonic current), thereby reduce to flow into the harmonic current of electrical network 8, make the total grid-connected current after compensation reach the requirement of THD<5%.
Be greater than from the optimal proportion A of inverter one 41 rated output powers and be less than from inverter one 41 rated output powers if photovoltaic array 1 real output continues to be increased to, although now can meet the requirement of THD<5% from the grid-connected current of inverter 1, in order to obtain the better quality of power supply, main inverter 4 is still operated in harmonic compensation pattern.
If photovoltaic array 1 real output continue to be increased to be greater than from inverter one 41 rated output powers and be less than twice from inverter one 41 rated output powers, main inverter 4 is worked from inverter 2 42 by CAN bus line command, grid-connected contactor 2 62 closures, again photovoltaic array 1 real output is averagely allocated to from inverter 1 with from inverter 2 42, although now from inverter 1 with can meet the requirement of THD<5% from total grid-connected current of inverter 2 42, in order to obtain the better quality of power supply, main inverter 4 is still operated in harmonic compensation pattern.
If photovoltaic array 1 real output continue to be increased to be greater than twice from inverter one 41 rated output powers and be less than three times from inverter one 41 rated output powers, main inverter 4 is worked from inverter 3 43 by CAN bus line command, grid-connected contactor 3 63 closures, again photovoltaic array 1 real output is averagely allocated to from inverter 1, from inverter 2 42 with from inverter 3 43, now from inverter 1, although from inverter 2 42 with can meet the requirement of THD<5% from total grid-connected current of inverter 3 43, in order to obtain the better quality of power supply, main inverter 4 is still operated in harmonic compensation pattern.
2) situation that photovoltaic array real output reduces
The initial condition of supposing the system is for all to work from inverter 1, from inverter 2 42 with from inverter 3 43, and main inverter 4 is operated in harmonic compensation pattern.
If photovoltaic array 1 real output be reduced to be greater than from inverter one 41 rated output powers and be less than twice from inverter one 41 rated output powers, main inverter 4 is averagely allocated to photovoltaic array 1 real output from inverter 1 with from inverter 2 42 by CAN bus, order again from inverter 3 43 and quit work, grid-connected contactor 3 63 disconnects, although now from inverter 1 with can meet the requirement of THD<5% from total grid-connected current of inverter 2 42, in order to obtain the better quality of power supply, main inverter 4 is still operated in harmonic compensation pattern.
If photovoltaic array 1 real output continue to be reduced to be greater than from the optimal proportion A(of inverter one 41 rated output powers for example A=50% from inverter one 41 rated output powers) and be less than from inverter one 41 rated output powers, main inverter 4 is born whole photovoltaic array 1 real outputs by CAN bus line command from inverter 1, order again from inverter 2 42 and quit work, grid-connected contactor 2 62 disconnects, although now can meet the requirement of THD<5% from the grid-connected current of inverter 1, in order to obtain the better quality of power supply, main inverter 4 is still operated in harmonic compensation pattern.
If photovoltaic array 1 real output continue to be reduced to be greater than from the optimal proportion B(of inverter one 41 rated output powers for example B=20% from inverter one 41 rated output powers) and be less than from the optimal proportion A of inverter one 41 rated output powers, now can not meet the requirement of THD<5% from the grid-connected current of inverter 1, so main inverter 4 is operated in harmonic compensation pattern, with from inverter 1 by way of compensation object carry out active power filtering, make harmonic current only between inverter 1 and main inverter 4 flow, thereby reduce to flow into the harmonic current of electrical network 8, make the total grid-connected current after compensation reach the requirement of THD<5%.
Be greater than 5% from inverter one 41 rated output powers and be less than from the optimal proportion B of inverter one 41 rated output powers if photovoltaic array 1 real output continues to be reduced to, now the grid-connected current from inverter one 41 compensation can not meet the requirement of THD<5%, so main inverter 4 is switched to the pattern of generating electricity by way of merging two or more grid systems, harmonic wave suppresses contactor 9 closures, main inverter 4 is born whole photovoltaic array 1 real outputs, quit work from inverter 1 by CAN bus line command again, grid-connected contactor 1 disconnects, now the grid-connected current of main inverter 4 can meet the requirement of THD<5%.
Be less than 5% from inverter one 41 rated output powers if photovoltaic array 1 real output continues to be reduced to, now photovoltaic array 1 real output is very little, and whole system is shut down, and grid-connected contactor 6 disconnects.
Claims (6)
1. a high-power centralized parallel network power generation coordinated control system, its feature is: comprise that a main inverter (4) and at least one are from inverter, main inverter (4) has less capacity, when being that capacity required is identical when more than two from inverter quantity;
Described main inverter (4) and each are from being connected by CAN bus between inverter.
2. high-power centralized parallel network power generation coordinated control system according to claim 1, its feature is:
Described each is all 5 times of main inverter (4) rated capacity from inverter rated capacity.
3. high-power centralized parallel network power generation coordinated control system according to claim 1, its feature is: described main inverter (4) adopts single inductor filter, the circuit topology of main inverter (4) is two level structures or three level structures;
Described each adopts single inductor filter or LCL filtering from inverter, and each the circuit topology from inverter is consistent, is two level structures or three level structures.
4. high-power centralized parallel network power generation coordinated control system according to claim 1, its feature is: described composing quantity comprises main inverter (4) and from inverter one (41), from inverter two (42), from inverter three (43),
Wherein, the input of main inverter (4) successively by harmonic wave suppress contactor (9), main counnter attack diode (2) is connected with photovoltaic array (1), between two inputs of main inverter (4), is parallel with in addition main DC capacitor (3); The output of main inverter (4) is connected with electrical network (8) by senior filter (5), main grid-connected contactor (6), isolating transformer (7) successively;
Be connected with photovoltaic array (1) by counnter attack diode one (21) successively from the input of inverter one (41), between two inputs of inverter one (41), be parallel with in addition DC capacitor one (31); Be connected with electrical network (8) by filter one (51), grid-connected contactor one (61), isolating transformer (7) successively from the output of inverter one (41);
Be connected with photovoltaic array (1) by counnter attack diode two (22) successively from the input of inverter two (42), between two inputs of inverter two (42), be parallel with in addition DC capacitor two (32); Be connected with electrical network (8) by filter two (52), grid-connected contactor two (62), isolating transformer (7) successively from the output of inverter two (42);
Be connected with photovoltaic array (1) by counnter attack diode three (23) successively from the input of inverter three (43), between two inputs of inverter three (43), be parallel with in addition DC capacitor three (33); Be connected with electrical network (8) by filter three (53), grid-connected contactor three (63), isolating transformer (7) successively from the output of inverter three (43).
5. a high-power centralized parallel network power generation control method for coordinating, depends on coordinated control system claimed in claim 4, and its feature is, implements in such a way to coordinate to control:
1) situation that photovoltaic array real output increases
The initial condition of supposing the system is stopped status,
Be greater than 5% from inverter one (41) rated output power and be less than from the optimal proportion B of inverter one (41) rated output power if photovoltaic array (1) real output is increased to, system starts, harmonic wave suppresses contactor (9) closure, grid-connected contactor (6) closure, main inverter (4) is operated in the pattern of generating electricity by way of merging two or more grid systems, now the grid-connected current of main inverter (4) can meet the requirement of THD<5%, from inverter one (41), all quit work from inverter two (42) with from inverter three (43)
Be greater than from the optimal proportion B of inverter one (41) rated output power and be less than from the optimal proportion A of inverter one (41) rated output power if photovoltaic array (1) real output continues to be increased to, main inverter (4) is worked from inverter one (41) by CAN bus line command, grid-connected contactor one (61) closure, bear whole photovoltaic arrays (1) real output from inverter one (41), now can not meet the requirement of THD<5% from the grid-connected current of inverter one (41), so suppressing contactor (9), harmonic wave disconnects, main inverter (4) is switched to harmonic compensation pattern, with from inverter one (41) by way of compensation object carry out active power filtering, harmonic current is only flowed between main inverter (4) and main inverter (41), thereby reduce to flow into the harmonic current of electrical network (8), make the total grid-connected current after compensation reach the requirement of THD<5%,
Be greater than from the optimal proportion A of inverter one (41) rated output power and be less than from inverter one (41) rated output power if photovoltaic array (1) real output continues to be increased to, now can meet the requirement of THD<5% from the grid-connected current of inverter one (41), main inverter (4) is operated in harmonic compensation pattern
If photovoltaic array (1) real output continue to be increased to be greater than from inverter one (41) rated output power and be less than twice from inverter one (41) rated output power, main inverter (4) is worked from inverter two (42) by CAN bus line command, grid-connected contactor two (62) closures, again photovoltaic array (1) real output is averagely allocated to from inverter one (41) with from inverter two (42), now from inverter one (41) with can meet the requirement of THD<5% from total grid-connected current of inverter two (42), main inverter (4) is operated in harmonic compensation pattern,
If photovoltaic array (1) real output continue to be increased to be greater than twice from inverter one (41) rated output power and be less than three times from inverter one (41) rated output power, main inverter (4) is worked from inverter three (43) by CAN bus line command, grid-connected contactor three (63) closures, again photovoltaic array (1) real output is averagely allocated to from inverter one (41), from inverter two (42) with from inverter three (43), now from inverter one (41), from inverter two (42) with can meet the requirement of THD<5% from total grid-connected current of inverter three (43), main inverter (4) is operated in harmonic compensation pattern,
2) situation that photovoltaic array real output reduces
The initial condition of supposing the system is for all to work from inverter one (41), from inverter two (42) with from inverter three (43), and main inverter (4) is operated in harmonic compensation pattern,
If photovoltaic array (1) real output be reduced to be greater than from inverter one (41) rated output power and be less than twice from inverter one (41) rated output power, main inverter (4) is averagely allocated to photovoltaic array (1) real output from inverter one (41) with from inverter two (42) by CAN bus, order again from inverter three (43) and quit work, grid-connected contactor three (63) disconnects, now from inverter one (41) and from inverter two (42) although total grid-connected current can meet the requirement of THD<5%, main inverter (4) is operated in harmonic compensation pattern,
Be greater than from the optimal proportion A of inverter one (41) rated output power and be less than from inverter one (41) rated output power if photovoltaic array (1) real output continues to be reduced to, main inverter (4) is born whole photovoltaic array 1 real outputs by CAN bus line command from inverter one (41), order again from inverter two (42) and quit work, grid-connected contactor two (62) disconnects, now can meet the requirement of THD<5% from the grid-connected current of inverter one (41), main inverter (4) is operated in harmonic compensation pattern
Be greater than from the optimal proportion B of inverter one (41) rated output power and be less than from the optimal proportion A of inverter one (41) rated output power if photovoltaic array (1) real output continues to be reduced to, now can not meet the requirement of THD<5% from the grid-connected current of inverter one (41), so main inverter (4) is operated in harmonic compensation pattern, with from inverter one (41) by way of compensation object carry out active power filtering, make harmonic current only between inverter one (41) and main inverter (4) flow, thereby reduce to flow into the harmonic current of electrical network (8), make the total grid-connected current after compensation reach the requirement of THD<5%,
Be greater than 5% from inverter one (41) rated output power and be less than from the optimal proportion B of inverter one (41) rated output power if photovoltaic array (1) real output continues to be reduced to, now the grid-connected current from inverter one (41) compensation can not meet the requirement of THD<5%, so main inverter (4) is switched to the pattern of generating electricity by way of merging two or more grid systems, harmonic wave suppresses contactor (9) closure, main inverter (4) is born whole photovoltaic arrays (1) real output, quit work from inverter one (41) by CAN bus line command again, grid-connected contactor one (61) disconnects, now the grid-connected current of main inverter (4) can meet the requirement of THD<5%,
Be less than 5% from inverter one (41) rated output power if photovoltaic array (1) real output continues to be reduced to, now photovoltaic array (1) real output is very little, and whole system is shut down, and grid-connected contactor (6) disconnects.
6. high-power centralized parallel network power generation control method for coordinating according to claim 5, its feature is, the described optimal proportion A from inverter one (41) rated output power preferably 50%; From the optimal proportion B of inverter one (41) rated output power preferably 20%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104950765A (en) * | 2015-06-23 | 2015-09-30 | 合肥工业大学 | Inverter parallel system based on CAN (controller area network) bus and carrier synchronization method of inverter parallel system |
| CN104950765B (en) * | 2015-06-23 | 2017-09-22 | 合肥工业大学 | A kind of inverter parallel system and its carrier synchronization method based on CAN |
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| CN107925246A (en) * | 2015-08-14 | 2018-04-17 | 光城公司 | Multiple inverter power control systems in energy production system |
| US11309714B2 (en) | 2016-11-02 | 2022-04-19 | Tesla, Inc. | Micro-batteries for energy generation systems |
| CN109120012A (en) * | 2018-10-18 | 2019-01-01 | 江苏佳讯纳通能源技术有限公司 | The multi-host parallel system and control method of single-phase hybrid energy-storing inverter |
| CN109768569A (en) * | 2018-12-27 | 2019-05-17 | 陕西科技大学 | A kind of more gird-connected inverter parallel running systems |
| CN109861274A (en) * | 2018-12-27 | 2019-06-07 | 陕西科技大学 | A kind of major-minor gird-connected inverter parallel running system and method with APF function |
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