CN104901212A - Voltage-reduction synchronization pre-assembly substation room - Google Patents

Voltage-reduction synchronization pre-assembly substation room Download PDF

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Publication number
CN104901212A
CN104901212A CN201510374172.XA CN201510374172A CN104901212A CN 104901212 A CN104901212 A CN 104901212A CN 201510374172 A CN201510374172 A CN 201510374172A CN 104901212 A CN104901212 A CN 104901212A
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China
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station
combining
relay
room
photovoltaic
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CN201510374172.XA
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CN104901212B (en
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刘志刚
王振中
孙东海
郭剑
胡益
闫飞朝
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The invention discloses a voltage-reduction synchronization pre-assembly substation room. The voltage-reduction synchronization pre-assembly substation room comprises a photovoltaic inverter, a transformer, an inverter chamber and a transformer chamber. The photovoltaic inverter is arranged in the inverter chamber, the transformer is arranged in the transformer chamber, and the inverter chamber and the transformer chamber are connected by a copper bar. The photovoltaic inverter comprises a direct-current circuit breaker, a voltage stabilizing capacitor, a three-phase inverter bridge, a filter, an alternating-current circuit breaker and a voltage reducer. The direct-current circuit breaker comprises a third switch (S1), and the third switch (S1) is arranged on a third lead (L0); the voltage reducer comprises a pre-charging resistor (R1) and a nonlinear resistor (R2), one end of the pre-charging resistor (R1) is electrically connected with a positive electrode of the voltage stabilizing capacitor, and the other end of the pre-charging resistor (R1) is connected with the third lead (L0) electrically. One end of the nonlinear resistor (R2) is electrically connected with the third lead (L0), and the other end is grounded. In the voltage-reduction synchronization pre-assembly substation room, capacity of the photovoltaic inverter can be increased.

Description

Step-down combining pre-assembled point of station
Technical field
The present invention relates to field of solar thermal power generation, be specifically related to a kind of step-down combining pre-assembled point of station.
Background technology
Solar energy has the advantages such as safe, clean and resource generality, can become the regenerative resource that alternative fossil energy is main.Solar energy power generating in its developmental research, market development and industrialized manufacture technology already as the focus of world community keen competition.
Pre-assembled point of traditional station has following defect:
(1) pre-assembled point of traditional station requires that commissioning staff must debug inverter at device interior, threatens the personal safety of personnel;
(2) secondary control system adopts singlechip technology or DSP control technology, and the impact that its master control borad is subject to the factors such as layout structure, mask-making technology and device quality is obvious, poor anti jamming capability, not easily expand, rate of failure is higher, and strong to surrounding environment dependence, the construction cycle is long;
(3) time due to pre-charge process, capacitor maximum withstand voltage be the open circuit voltage of photovoltaic array, that is withstand voltage open circuit voltage that must be greater than photovoltaic array of the power device of photovoltaic DC-to-AC converter.Therefore, when the group string of photovoltaic array, the open circuit voltage of the photovoltaic module of going here and there should not be greater than the withstand voltage of power device of inverter, and pre-assembled point of therefore traditional station exists the low defect of photovoltaic inverter grid-connected capacity.
Summary of the invention
The object of this invention is to provide a kind of step-down combining pre-assembled point of station, to solve above-mentioned problems of the prior art.
According to an aspect of the present invention, provide a kind of step-down combining pre-assembled point of station, described step-down combining pre-assembled point of station comprises photovoltaic DC-to-AC converter, transformer, inverter room and transformer room, it is indoor that described photovoltaic DC-to-AC converter is arranged at described inverter, described transformer is arranged in described transformer room, and is connected by copper bar between described inverter room and described transformer room; Described photovoltaic DC-to-AC converter comprises DC circuit breaker, electric capacity of voltage regulation, three phase inverter bridge, filter, AC circuit breaker and dropping equipment; Wherein said DC circuit breaker comprises the 3rd switch (S 1), the 3rd switch (S 1) be arranged at privates (L 0) on, described dropping equipment comprises pre-charge resistance (R 1) and nonlinear resistance (R 2), described pre-charge resistance (R 1) one end be electrically connected with the positive pole of described electric capacity of voltage regulation, described pre-charge resistance (R 1) the other end by the first wire (L 1) and described privates (L 0) electrical connection, described nonlinear resistance (R 2) one end by the second wire (L 2) and described privates (L 0) electrical connection, described nonlinear resistance (R 2) other end ground connection, and at described first wire (L 1) be provided with the first switch (QB 1) and at described second wire (L 2) be provided with second switch (QB 2).
Preferably, described dropping equipment also comprises CPU module, the first relay and the second relay, wherein, described first relay is electrically connected with described first switch, described second relay is electrically connected with described second switch, and described CPU module is electrically connected with described first relay and described second relay respectively.
Preferably, described nonlinear resistance is adjustable resistance.
Preferably, described dropping equipment also comprises power supply, and described power supply is electrically connected with described first relay, described second relay and described CPU module thus provides electric energy for described first relay, described second relay and described CPU module.
Preferably, described pre-charge resistance is linear resistance.
Preferably, described inverter room comprises direct current and converges line cabinet, inverter bridge room, filter chamber and exchange and export room, and wherein said DC circuit breaker and described dropping equipment are arranged at that described direct current converges in line cabinet, described electric capacity of voltage regulation and three phase inverter bridge are arranged at that described inverter bridge is indoor, described filter is arranged in described filter chamber and described AC circuit breaker is arranged at described interchange and exports indoor.
Preferably, described direct current remittance line cabinet, inverter bridge room, filter chamber and interchange export room and are respectively equipped with window, can be debugged by described window to described DC circuit breaker, dropping equipment, electric capacity of voltage regulation, three phase inverter bridge and filter.
Preferably, described direct current remittance line cabinet, inverter bridge room, filter chamber and interchange export indoor and are respectively equipped with heat abstractor.
Preferably, described step-down combining pre-assembled point of station comprises two photovoltaic DC-to-AC converters and two cover inverter rooms, and inverter indoor described in every suit arrange a described photovoltaic DC-to-AC converter.
Preferably, described step-down combining pre-assembled point of station also comprises lightning arrester, lightning-arrest counter, the relay detecting power transformer interior fault and hyperbaric chamber, and the relay of described lightning arrester, lightning-arrest counter and detection power transformer interior fault is arranged in described hyperbaric chamber.
Step-down combining of the present invention pre-assembled point of station adopts floor plan, and offers window in the outside of step-down combining pre-assembled point of station, and commissioning staff can carry out debugging efforts in outside, and fail safe is protected.Secondly, reduce grid-connected open circuit voltage by dropping equipment, the capacity of photovoltaic DC-to-AC converter can be improved; Solve the too high equipment that causes of photovoltaic module open circuit voltage under extreme cold condition simultaneously and certainly can not open problem; Again, by adding dropping equipment, effectively prevent the problem of operating voltage lower than MPPT minimum voltage of existence when grid-connected header box amount is lacked.
Accompanying drawing explanation
Fig. 1 is the system connection diagram of step-down combining of the present invention pre-assembled point of station;
Fig. 2 is the side schematic view of step-down combining of the present invention pre-assembled point of station;
Fig. 3 is the floor map of step-down combining of the present invention pre-assembled point of station;
Fig. 4 is the connection diagram of the photovoltaic DC-to-AC converter of step-down combining of the present invention pre-assembled point of station; And
Fig. 5 is the control schematic diagram of the CPU module of the photovoltaic DC-to-AC converter of step-down combining of the present invention pre-assembled point of station.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present invention is described in detail, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and the connotation just in order to technical solution of the present invention is described.
Term explanation
Divide station: electric equipment photovoltaic DC-to-AC converter and box-type substation become one, the DC conversion that photovoltaic arrays produces by this system is alternating current, and completes once boosting supply electrical network use.
Photovoltaic DC-to-AC converter: by power electronic device (MOSFET, IGBT etc.) contact resistance electric capacity, with the break-make of the mode control device of pulse width modulation, the direct current that header box transmission comes is transformed into alternating current, complete the MPPT maximum power point tracking (MPPT) of photovoltaic module simultaneously, ensure Based Intelligent Control and anti-islanding effect etc.
Pre-charge resistance: inverter DC bus capacitance before charging both end voltage be zero, be equivalent to short circuit in the moment of equipment charge, very large impulse current can be produced, be easy to cause the power device of inverter to damage.Therefore need to connect a resistance at charge circuit in pre-charge process, to play the effect of Limited Current.This resistance is just called pre-charge resistance.
Electric capacity of voltage regulation: a voltage source positive and negative terminal electric capacity in parallel, during for the circuit such as copped wave, inversion, has good filter action; When change in voltage, due to the effect of capacitance energy storage, the voltage at two ends can not suddenly change, and just ensure that the steady of voltage.
Upstream voltage: DC circuit breaker point of incoming cables port voltage.
Step-down combining of the present invention pre-assembled point of station generally includes photovoltaic DC-to-AC converter, transformer, inverter room and transformer room.Wherein photovoltaic DC-to-AC converter is arranged at inverter indoor, and transformer is arranged in transformer room, and is connected by copper bar between inverter room and transformer room.Photovoltaic DC-to-AC converter comprises DC circuit breaker, electric capacity of voltage regulation, three phase inverter bridge, filter, AC circuit breaker and dropping equipment; Wherein this DC circuit breaker comprises the 3rd switch (S 1), the 3rd switch (S 1) be arranged at privates (L 0) on, this dropping equipment comprises pre-charge resistance (R 1) and nonlinear resistance (R 2), this pre-charge resistance (R 1) one end be electrically connected with the positive pole of this electric capacity of voltage regulation, this pre-charge resistance (R 1) the other end by the first wire (L 1) and this privates (L 0) electrical connection, this nonlinear resistance (R 2) one end by the second wire (L 2) and this privates (L 0) electrical connection, this nonlinear resistance (R 2) other end ground connection, and at this first wire (L 1) be provided with the first switch (QB 1) and at this second wire (L 2) be provided with second switch (QB 2).
Fig. 1 is the system connection diagram of step-down combining of the present invention pre-assembled point of station; Fig. 2 is the side schematic view of step-down combining of the present invention pre-assembled point of station; Fig. 3 is the floor map of step-down combining of the present invention pre-assembled point of station.As shown in Figures 1 to 3, step-down combining pre-assembled point of station comprises two photovoltaic DC-to-AC converters, 100, transformer 200, inverter room 100A, transformer room 9 and hyperbaric chamber 11.Although in the present embodiment, step-down combining pre-assembled point of station comprises hyperbaric chamber 11, but those skilled in the art will appreciate that step-down combining of the present invention pre-assembled point of station also can not comprise hyperbaric chamber 11.Wherein photovoltaic DC-to-AC converter 100 is arranged in the 100A of inverter room, and transformer 200 is arranged in transformer room 9, is connected between inverter room 100A and transformer room 200A by copper bar.
As shown in Figure 1, photovoltaic DC-to-AC converter 100 comprises DC circuit breaker 10, electric capacity of voltage regulation 20, three phase inverter bridge 30, filter 40, AC circuit breaker 50 and dropping equipment.Wherein, DC circuit breaker 10, electric capacity of voltage regulation 20, three phase inverter bridge 30, filter 40 and AC circuit breaker 50 are electrically connected successively, and DC circuit breaker 10 is for connecting photovoltaic module, and AC circuit breaker 50 is for connection transformer 200.Dropping equipment comprises CPU module 51, first relay 52, power supply 53, pre-charge resistance R 1, nonlinear resistance R 2, the first wire L 1, the second wire L 2, the first switch QB 1and second switch QB 2.Wherein, the first relay 52 and the second relay 54 are two and open two and close independent contact.
As shown in figures 2-3, inverter room 100A comprises direct current and converges line cabinet 1, inverter bridge room 4, filter chamber 5 and exchange and export room 7, and wherein DC circuit breaker 10 and dropping equipment are arranged at that direct current converges in line cabinet 1, electric capacity of voltage regulation 20 is arranged in inverter bridge room 4 with three phase inverter bridge 30, filter 40 is arranged in filter chamber 5 and AC circuit breaker 50 is arranged at and exchanges in output room 7.
Direct current remittance line cabinet 1 offers window 1A, inverter bridge room 4 offers window 4A, filter chamber 5 offers window 5A, exchange output room 7 and offer window 7A, hyperbaric chamber 11 offers window 11A, can be debugged DC circuit breaker 10, dropping equipment, electric capacity of voltage regulation 20, three phase inverter bridge 30 and AC circuit breaker 50 respectively by window 1A, 4A, 5A and 7A.
In direct current converges line cabinet 1, be provided with heat abstractor 1B, in inverter bridge room 4, be provided with heat abstractor 4B, in filter chamber 5, be provided with heat abstractor 5B, and be provided with heat abstractor 7B in interchange output room 7.By the effect of heat abstractor 1B, 4B, 5B and 7B, direct current remittance line cabinet 1, inverter bridge room 4, filter chamber 5 can be prevented and exchange the temperature exporting room 7 too high.
In the present invention, a step-down combining pre-assembled point of station comprises two photovoltaic DC-to-AC converters, 100, two inverter room 100A, a transformer 200, transformation room 9 and a hyperbaric chamber 11, wherein each inverter 100 is arranged in the 100A of each inverter room, transformer 200 is arranged in transformer room 9, and the relay (not shown) of lightning arrester, lightning-arrest counter and detection power transformer interior fault is arranged in hyperbaric chamber 11.
Fig. 4 is the connection diagram of the photovoltaic DC-to-AC converter 100 of step-down combining of the present invention pre-assembled point of station.As shown in Figure 4, DC circuit breaker 10 comprises multiple switch, wherein the 3rd switch S 1be arranged at privates L 0on, pre-charge resistance R 1one end by the first wire L 1be connected to the positive pole of electric capacity of voltage regulation 20, pre-charge resistance R 1the other end by the first wire L 1be connected to privates L 0on, nonlinear resistance R 2one end by the second wire L 2be connected to privates L 0on, nonlinear resistance R 2other end ground connection, at the first wire L 1be provided with the first switch QB 1with at the second wire L 2be provided with second switch QB 2.Wherein, the 3rd switch S of DC circuit breaker 10 1again by privates L after in parallel with other all switches elder generations 0connect with electric capacity of voltage regulation 20.
In the present embodiment, nonlinear resistance R 2for adjustable resistance, by regulating nonlinear resistance R 2the 3rd switch S can be controlled 1the size of upstream voltage, and pre-charge resistance R 1for linear resistance, by pre-charge resistance R 1electric capacity of voltage regulation can be prevented breakdown,
Power supply 53 is electrically connected with the first relay 52, second relay 54 and CPU module 51, thus provides electric energy for the first relay 52, second relay 54 and CPU module 51.CPU module 51 is electrically connected with the first relay 52 and the second relay 54 thus sends instruction respectively to the first relay 52 and the second relay 54, and the first relay 52 and the second relay 54 receive the instruction from CPU module 51 and control the first switch QB 1with second switch QB 2opening and closing.
Fig. 5 is the schematic diagram of CPU module.As shown in Figure 5, CPU module can send signal 101,102,103,104,105 and 107, and wherein signal 101 controls the first switch QB 1close a floodgate; Signal 102 controls the first switch QB 1separating brake; Signal 103 controls second switch QB 2close a floodgate; Signal 104 controls second switch QB 2separating brake; Signal 105 controls the first switch QB 1close a point state; Signal 106 controls second switch QB 2close a point state; Signal 107 controls the 3rd switch S 1state.
When needing to open, undertaken by following process.
(1) press manual precharge button (not shown), CPU module sends signal 103 and makes the second relay 54 action, thus the second relay 54 controls second switch QB 2closed, wherein, by regulating nonlinear resistance R 2can control voltage U 1size;
(2) when the 3rd switch S 1 upstream electrical pressure is reduced to voltage U 1time, CPU module sends 101 signals and makes the first relay 52 action, thus controls the first switch QB 1closed, pre-charge resistance R 1on flow through electric current, electric capacity of voltage regulation 20 precharge.
(3) after electric capacity of voltage regulation 20 precharge completes, the 3rd switch S of closed DC circuit breaker 10 1with other all switches;
(4) after photovoltaic DC-to-AC converter meets entry condition, photovoltaic DC-to-AC converter is started;
(5) after described photovoltaic DC-to-AC converter parallel-adder settle-out time t, CPU module sends 104 signals and makes the second relay 54 action, thus cut-off switch second switch QB 2, thus complete the machine that the opens process of whole photovoltaic DC-to-AC converter.
In the present invention, the time t power output that is photovoltaic DC-to-AC converter is increased to time needed for peak power output from 0.
Voltage U 1meet following relation: U n≤ U 1<U c, wherein U nfor the maximum working voltage of photovoltaic DC-to-AC converter, U cfor accessing the open circuit voltage of the photovoltaic module of photovoltaic DC-to-AC converter.
According to a further aspect in the invention, additionally provide a kind of machine that opens method of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter comprises DC circuit breaker, electric capacity of voltage regulation, three phase inverter bridge, filter, AC circuit breaker and dropping equipment, and wherein, described DC circuit breaker comprises the 3rd switch S 1, the 3rd switch S 1be arranged at privates L 0on, described dropping equipment comprises pre-charge resistance R 1with nonlinear resistance R 2, described pre-charge resistance R 1one end be electrically connected with the positive pole of described electric capacity of voltage regulation, described pre-charge resistance R 1the other end by the first wire L 1with described privates L 0electrical connection, one end of described nonlinear resistance is by the second wire L 2with described privates L 0electrical connection, the other end ground connection of described nonlinear resistance, and at described first wire L 1be provided with the first switch QB 1with at described second wire L 2be provided with second switch QB 2, wherein, said method comprising the steps of:
Step one, closed second switch QB 2;
Step 2, when the 3rd switch S 1upstream electrical pressure is reduced to voltage U 1time, closed first switch QB 1;
Step 3, when after electric capacity of voltage regulation 20 charging complete, the 3rd switch S of closed DC circuit breaker 10 1and other all switches;
Step 4, after photovoltaic DC-to-AC converter meets entry condition, start photovoltaic DC-to-AC converter;
Step 5, when after photovoltaic DC-to-AC converter parallel-adder settle-out time t, disconnect second switch QB 2, complete the machine that the opens process of whole photovoltaic DC-to-AC converter.
For the photovoltaic DC-to-AC converter of a certain specified output 750MW, superiority of the present invention is described below.
The input of photovoltaic DC-to-AC converter, output performance parameter are respectively in table 1 and table 2.Access the parameter of photovoltaic module in table 3.
Table 1 photovoltaic DC-to-AC converter input parameter
Maximum DC input power (kW) MPPT voltage range (VDC) Maximum input direct-current electric current (A)
825 450~820 1600
Table 2 photovoltaic DC-to-AC converter output parameter
Rated output power (kW) Peak power output (kW) Rated operational voltage (V) Specified output frequency (Hz)
750 810 315 50
The performance parameter of table 3 photovoltaic module
Rated power (kW) Open circuit voltage (V) Operating voltage (V)
310 45.45 37.00
If adopt traditional photovoltaic DC-to-AC converter serial connection photovoltaic module, so photovoltaic module be often connected in series into block number N maxfollowing formula should be met:
45.45 N max≤820 (1)
The solution of formula (1) is;
N max=18 (2)
If adopt photovoltaic DC-to-AC converter of the present invention be connected in series photovoltaic module, be reduced to operating voltage 37.00V by open circuit voltage 45.45V, so photovoltaic module be often connected in series into block number N maxformula (3) should be met
37.00 N max≤820 (3)
The solution of formula (3) is:
N max=22 (4)
So the rated power of photovoltaic DC-to-AC converter can rise to
P = 750 * 22 18 = 916.6 k W - - - ( 5 )
As can be seen from formula (5), photovoltaic inverter grid-connected capacity of the present invention obviously improves.Compared to traditional photovoltaic DC-to-AC converter, grid connection capacity improves 22.2 ℅.
Therefore, by step-down combining of the present invention pre-assembled point of station, the grid connection capacity of photovoltaic DC-to-AC converter can be improved.In addition, the present invention can also solve the too high problem causing photovoltaic DC-to-AC converter certainly not open of photovoltaic module open circuit voltage under extreme cold condition.
Step-down combining of the present invention pre-assembled point of station adopts floor plan, and offers window in the outside of step-down combining pre-assembled point of station, and commissioning staff can carry out debugging efforts in outside, and fail safe is protected.Secondly, reduce grid-connected open circuit voltage by dropping equipment, the capacity of photovoltaic DC-to-AC converter can be improved; Solve the too high equipment that causes of photovoltaic module open circuit voltage under extreme cold condition simultaneously and certainly can not open problem; Again, by adding dropping equipment, effectively prevent the problem of operating voltage lower than MPPT minimum voltage of existence when grid-connected header box amount is lacked.
Below described preferred embodiment of the present invention in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present invention, those skilled in the art can make various changes or modifications the present invention.These equivalent form of values fall within the application's appended claims limited range equally.

Claims (10)

1. a step-down combining pre-assembled point of station, it is characterized in that: described step-down combining pre-assembled point of station comprises photovoltaic DC-to-AC converter, transformer, inverter room and transformer room, it is indoor that described photovoltaic DC-to-AC converter is arranged at described inverter, described transformer is arranged in described transformer room, and is connected by copper bar between described inverter room and described transformer room; Described photovoltaic DC-to-AC converter comprises DC circuit breaker, electric capacity of voltage regulation, three phase inverter bridge, filter, AC circuit breaker and dropping equipment; Wherein said DC circuit breaker comprises the 3rd switch (S 1), the 3rd switch (S 1) be arranged at privates (L 0) on, described dropping equipment comprises pre-charge resistance (R 1) and nonlinear resistance (R 2), described pre-charge resistance (R 1) one end be electrically connected with the positive pole of described electric capacity of voltage regulation, described pre-charge resistance (R 1) the other end by the first wire (L 1) and described privates (L 0) electrical connection, described nonlinear resistance (R 2) one end by the second wire (L 2) and described privates (L 0) electrical connection, described nonlinear resistance (R 2) other end ground connection, and at described first wire (L 1) be provided with the first switch (QB 1) and at described second wire (L 2) be provided with second switch (QB 2).
2. step-down combining according to claim 1 pre-assembled point of station, it is characterized in that, described dropping equipment also comprises CPU module, the first relay and the second relay, wherein, described first relay is electrically connected with described first switch, described second relay is electrically connected with described second switch, and described CPU module is electrically connected with described first relay and described second relay respectively.
3. step-down combining according to claim 1 pre-assembled point of station, is characterized in that, described nonlinear resistance is adjustable resistance.
4. step-down combining according to claim 2 pre-assembled point of station, it is characterized in that, described dropping equipment also comprises power supply, and described power supply is electrically connected with described first relay, described second relay and described CPU module thus provides electric energy for described first relay, described second relay and described CPU module.
5. step-down combining according to claim 1 pre-assembled point of station, is characterized in that, described pre-charge resistance is linear resistance.
6. step-down combining according to claim 1 pre-assembled point of station, it is characterized in that, described inverter room comprises direct current and converges line cabinet, inverter bridge room, filter chamber and exchange and export room, and wherein said DC circuit breaker and described dropping equipment are arranged at that described direct current converges in line cabinet, described electric capacity of voltage regulation and three phase inverter bridge are arranged at that described inverter bridge is indoor, described filter is arranged in described filter chamber and described AC circuit breaker is arranged at described interchange and exports indoor.
7. step-down combining according to claim 6 pre-assembled point of station, it is characterized in that, described direct current remittance line cabinet, inverter bridge room, filter chamber and interchange export room and are respectively equipped with window, can be debugged by described window to described DC circuit breaker, dropping equipment, electric capacity of voltage regulation, three phase inverter bridge and filter.
8. step-down combining according to claim 6 pre-assembled point of station, is characterized in that, described direct current remittance line cabinet, inverter bridge room, filter chamber and interchange export indoor and be respectively equipped with heat abstractor.
9. step-down combining according to claim 1 pre-assembled point of station, is characterized in that, described step-down combining pre-assembled point of station comprises two photovoltaic DC-to-AC converters and two cover inverter rooms, and inverter indoor described in every suit arrange a described photovoltaic DC-to-AC converter.
10. step-down combining according to claim 1 pre-assembled point of station, it is characterized in that, described step-down combining pre-assembled point of station also comprises lightning arrester, lightning-arrest counter, the relay detecting power transformer interior fault and hyperbaric chamber, and the relay of described lightning arrester, lightning-arrest counter and detection power transformer interior fault is arranged in described hyperbaric chamber.
CN201510374172.XA 2015-06-30 2015-06-30 The pre-assembled substation room of step-down combining Active CN104901212B (en)

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CN202817566U (en) * 2012-07-31 2013-03-20 特变电工股份有限公司 Prefabricated transformer substation for photovoltaic power generation
CN204992375U (en) * 2015-06-30 2016-01-20 中国电力工程顾问集团华东电力设计院有限公司 Step -down is incorporated into power networks and is assembled substation room in advance

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JPH11312022A (en) * 1998-04-28 1999-11-09 Yaskawa Electric Corp Inverter device for generating photovoltatic power and method for controlling the same device
US20090207543A1 (en) * 2008-02-14 2009-08-20 Independent Power Systems, Inc. System and method for fault detection and hazard prevention in photovoltaic source and output circuits
CN201910625U (en) * 2010-10-14 2011-07-27 国网电力科学研究院 Grid-connected photovoltaic inverter based on super capacitor
CN202817566U (en) * 2012-07-31 2013-03-20 特变电工股份有限公司 Prefabricated transformer substation for photovoltaic power generation
CN204992375U (en) * 2015-06-30 2016-01-20 中国电力工程顾问集团华东电力设计院有限公司 Step -down is incorporated into power networks and is assembled substation room in advance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105576706A (en) * 2016-03-23 2016-05-11 中国电力工程顾问集团华东电力设计院有限公司 Five-phase photovoltaic inverter pre-assembly substation room and control method thereof
CN105576706B (en) * 2016-03-23 2018-05-22 中国电力工程顾问集团华东电力设计院有限公司 The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method

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