CN105958414A - Mobile battery energy storage device-based power distribution network medium-voltage line DC thermal ice-melting circuit and method - Google Patents
Mobile battery energy storage device-based power distribution network medium-voltage line DC thermal ice-melting circuit and method Download PDFInfo
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- CN105958414A CN105958414A CN201610472517.XA CN201610472517A CN105958414A CN 105958414 A CN105958414 A CN 105958414A CN 201610472517 A CN201610472517 A CN 201610472517A CN 105958414 A CN105958414 A CN 105958414A
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- converter
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- ice
- battery energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
Abstract
The invention relates to a mobile battery energy storage device-based power distribution network medium-voltage line DC thermal ice-melting circuit, which comprises a two-way converter, a battery energy storage system, a DC converter, an AC switch and a DC switch, wherein an AC end of the two-way converter is connected to a power supply input end of the power distribution network medium-voltage line DC thermal ice-melting circuit through the AC switch; a DC end of the two-way converter is connected to a positive electrode and a negative electrode of the battery energy storage system in parallel; the input end of the DC converter is also connected with the positive electrode and the negative electrode of the battery energy storage system in parallel; an output end of the DC converter is connected to the output end of the power distribution network medium-voltage line DC thermal ice-melting circuit through the DC switch and is used for being connected to an ice-coating line; and the battery energy storage system, the two-way converter, the DC converter, the AC switch and the DC switch are integrated into a semi-mounted mobile car. The mobile battery energy storage device-based power distribution network medium-voltage line DC thermal ice-melting circuit is simple and can be applied to emergency DC thermal ice-melting.
Description
Technical field
The present invention relates to distribution line de-icing technology field, particularly a kind of based on mobile battery
The power distribution network medium-voltage line direct current thermal ice-melting circuit of energy storage device and method.
Background technology
Ice disaster suffers from serious harm, China's ice and snow to electrical network, traffic and crops etc.
Disaster distribution is wide, and the rare ice disaster of 2008 brings large area icing to power transformating and supplying facility,
Electric network composition is seriously damaged, and some areas power and are forced to interrupt, and bring to national economy
Massive losses.Timely and effectively power transmission and distribution icing circuit is carried out except ice-melt is to reduce electrical network icing
One of important channel that calamity is damaged, in view of major network impact is wide, loss of outage is big, high for major network
The thermal ice-melting technology of pressure transmission line, has carried out research extensively and profoundly the most.Owing to joining
Electrical network distribution is wide, circuit is numerous, length far away from major network transmission line of electricity, and power distribution network covers
Ice circuit is often in alpine region, the complicated topographical conditions of leap, and power distribution network direct current heating power melts
Ice is difficult to obtain the effect of ice-melt on a large scale, and the ice-melt Study on Measures for power distribution network goes back phase at present
To deficiency, main distribution ice-melt cooperates, and could play the effect sent a telegram in reply as early as possible, carry out and join
Power network line ice-melt Study on Measures has realistic meaning.Existing electric line thermal ice-melting is general
All considering that power supply takes from AC network, existing part is applicable to the ice-melt of power distribution network mid & low-voltage line
Device is also contemplated for power supply and takes from AC system or interim alternating current power supply, there is not yet and is applicable to take from directly
The mid & low-voltage line deicing device of stream power-supply system.Battery energy storage device can be used for uninterrupted emergent
Protect the multiple occasions such as power supply, peak load shifting, raising platform district power supply capacity, along with battery energy storage skill
The development of art, the particularly development of ferric phosphate lithium cell energy storage technology so that battery energy density
Significantly improve relative to traditional lead acid batteries, fairly large battery energy storage system and current transformer
System compact can be integrated in mobile compartment, it is achieved flexible, motor-driven, possesses low noise and pollution-free
Etc. feature, promote the popularization and application of Mobile energy storage device based on battery energy storage.Between not
On the basis of the functions such as disconnected Emergency electricity, peak load shifting, raising platform district power supply capacity, integrated
For the direct current thermal ice-melting function of distribution network line, lose system power supply when there is circuit bar
Time, mobile battery energy storage device can provide emergent direct current thermal ice-melting function, for deeply digging
The diversified application function of pick mobile battery energy storage device and the engineer applied of lifting device
Value has positive effect.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of based on mobile battery energy storage device
Power distribution network medium-voltage line direct current thermal ice-melting circuit and method, device is simple, is available for emergent direct current
Thermal ice-melting.
Assembly of the invention uses below scheme to realize: a kind of based on mobile battery energy storage device
Power distribution network medium-voltage line direct current thermal ice-melting circuit, including two way convertor, battery energy storage system
System, DC converter, AC switch, DC switch；The exchange end of described two way convertor
The power supply of described power distribution network medium-voltage line direct current thermal ice-melting circuit it is connected to through described AC switch
Input, the both positive and negative polarity of the DC terminal of described two way convertor and described battery energy storage system also connects,
The input of described DC converter also with the both positive and negative polarity of described battery energy storage system connecing, described
The outfan of DC converter is connected to described power distribution network medium-voltage line direct current through described DC switch
The outfan of thermal ice-melting circuit, in order to be connected to icing circuit；Described battery energy storage system,
Two way convertor, DC converter, AC switch, DC switch are integrated in semi-trailer movable type car
Railway carriage or compartment.
Further, described battery energy storage system is ferric phosphate lithium cell energy-storage system.
Further, described DC converter is symmetric double brachium pontis series direct current changer, including
Buffer circuit, LC filter circuit and two symmetrical brachium pontis.
Further, described DC converter uses IGBT power device.
Further, described power distribution network medium-voltage line includes power distribution network 10kV, 20kV, 35kV
Circuit.
The method of the present invention uses below scheme to realize: a kind of based on mentioned above based on movement
The method of the power distribution network medium-voltage line direct current thermal ice-melting circuit of formula battery energy storage device, specifically wraps
Include following steps:
Step S1: before carrying out ice-melt operation, port of export AC switched by flexible cable
Son is connected to 0.4kV alternating current power supply, Guan Bi AC switch, is full of by described battery energy storage system
Electricity；After fully charging, disconnect AC switch, remove described flexible cable；
Step S2: by out of service for icing circuit, is entered one one time by cuprum aluminum wire clamp
Flexible cable connects the biphase incoming end of A, B of icing circuit, and A, B of icing circuit are biphase
End carries out short circuit by shorting stub, measures the DC impedance of icing circuit homework circuit, and core
Calculate the output voltage of DC converter outfan after loading direct current thermal ice-melting electric current must not exceed
Its maximum operating voltage；
Step S3: the one end entering a flexible cable by is connected to the outlet of DC converter
Terminal, closed DC switchs, and starts DC converter, by the output current value of DC converter
It is arranged to direct current thermal ice-melting current value；Every time during loading current value stabilization, observe icing circuit
Access point, short circuit point, the temperature rise of observation station, if conductor temperature more than 40 degree, wire connects
Head temperature is paid close attention to when exceeding conductor temperature 10 degree；If conductor temperature more than 50 degree,
The temperature difference persistently raises and reduces loading current immediately during more than 15 degree, and stops operation；
Step S4: when the input terminal voltage of DC converter is more than output end voltage, described
DC converter works in buck pattern automatically, and the first brachium pontis works in buck pattern, and second
The switching tube S4 of brachium pontis is in lasting cut-off state, by controlling the switching tube S1 of the first brachium pontis
Dutycycle D1, it is achieved blood pressure lowering works, and input and output voltage relation is:
VO=Vi×D1；
Wherein, VOFor the output end voltage of described DC converter, ViFor described DC converter
Input terminal voltage；
When the input terminal voltage of described DC converter is nearly equal to output end voltage, direct current becomes
Parallel operation works in direct mode operation automatically, and the switching tube S1 of the first brachium pontis is in lasting closure state,
The switching tube S4 of the second brachium pontis is in lasting cut-off state, and input and output voltage relation is:
VO=Vi×D1；
D1=1；
When the input terminal voltage of described DC converter is less than output end voltage, DC converter
Automatically working in boost pattern, the switching tube S1 of the first brachium pontis is in lasting closure state,
Second brachium pontis works in boost pattern, by controlling the duty of the switching tube S4 of the second brachium pontis
Compare D4, it is achieved boosting work, input and output voltage relation is:
Step S5: after completing A, B biphase ice-melt operation, closes DC converter, disconnects DC
Switch, is substantially discharged three-phase line, then by the end short circuit of A, B, C three-phase,
The outlet terminal of DC switch is connected to the flexible cable transfer of B phase and is connected to C phase head end, opens
Twice C phase ice-melt operations are entered in exhibition one, and closed DC switchs, and start DC converter, by direct current
The output current value of changer is arranged to direct current thermal ice-melting current value, is loading electricity equally every time
When flow valuve is stablized, observe icing line access point, short circuit point, the temperature rise of observation station, such as phenolphthalein
Line temperature more than 40 degree, terminal temperature pays close attention to when exceeding conductor temperature 10 degree；
Conductor temperature more than 50 degree, the temperature difference persistently raises and reduces the most immediately during more than 15 degree and load electricity
Stream, and stop operation；
Step S6: after completing C phase ice-melt operation, the ice-melt operation of three-phase line completes the most,
Closing DC converter, disconnect DC switch, be substantially discharged three-phase line, dismounting is melted
Ice operation wiring, recovers three-phase line to state time out of service.
Compared with prior art, the battery energy storage system of the present invention uses ferric phosphate lithium cell storage
Electric energy, two way convertor be ferric phosphate lithium cell energy-storage system provide charging inlet, by based on
The DC converter regulation DC ice melting current of symmetric double brachium pontis series connection buck-boost, two-way
Current transformer, ferric phosphate lithium cell energy-storage system, DC converter and switch are all integrated to semi-trailer
Portable compartment.By DC converter based on symmetric double brachium pontis series connection buck-boost circuit
Input be connected to the both positive and negative polarity of battery energy storage system, outfan is connected to icing by cable
Circuit, DC converter flexible based on symmetric double brachium pontis series connection buck-boost circuit
Ice-melt output electric current, meets power distribution network medium-voltage line direct current thermal ice-melting voltage power supply wide ranges
Requirement, it is adaptable to direct current thermal ice-melting voltage is higher than, less than or equal to battery energy storage system voltage
I.e. three kinds of operating modes of the input voltage of DC converter, connect based on symmetric double brachium pontis
The DC converter of buck-boost uses IGBT power device, can open at any time and
Disjunction, controls and the method for operation is relatively easy, and output voltage waveforms quality is good, uses modularity
Structure, it is simple to the power expansion of device.
Accompanying drawing explanation
Fig. 1 is two to be in series and one enter a direct current thermal ice-melting schematic diagram in the embodiment of the present invention.
Fig. 2 is two and a string one to enter twice direct current thermal ice-melting schematic diagrams in the embodiment of the present invention.
Fig. 3 is DC converter schematic diagram in the embodiment of the present invention.
Fig. 4 is that in the embodiment of the present invention, DC converter works in buck mode circuit schematic diagram.
Fig. 5 is that in the embodiment of the present invention, DC converter works in direct mode operation circuit diagram.
Fig. 6 is that in the embodiment of the present invention, DC converter works in boost mode circuit schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As shown in Figure 1, Figure 2, Figure 3 shows, one is present embodiments provided based on mobile battery
The power distribution network medium-voltage line direct current thermal ice-melting circuit of energy storage device, including two way convertor, electricity
Pond energy-storage system, DC converter, AC switch, DC switch；Described two way convertor
Exchange end through described AC switch be connected to described power distribution network medium-voltage line direct current thermal ice-melting electricity
The power input on road, the DC terminal of described two way convertor is with described battery energy storage system just
Negative pole also connects, the input of described DC converter also with the both positive and negative polarity of described battery energy storage system
And connect, the outfan of described DC converter is connected in described power distribution network through described DC switch
The outfan of line ball road direct current thermal ice-melting circuit, in order to be connected to icing circuit；Described battery
Energy-storage system, two way convertor, DC converter, AC switch, DC switch are integrated in semi-mounted
Formula movable type compartment.
In the present embodiment, described battery energy storage system is ferric phosphate lithium cell energy-storage system.
In the present embodiment, described DC converter is symmetric double brachium pontis series direct current changer,
Including buffer circuit, LC filter circuit and two symmetrical brachium pontis.
In the present embodiment, described DC converter uses IGBT power device.
In the present embodiment, described power distribution network medium-voltage line include power distribution network 10kV, 20kV,
35kV circuit.
The present embodiment additionally provides and a kind of fills based on mobile battery energy storage based on mentioned above
The method of the power distribution network medium-voltage line direct current thermal ice-melting circuit put, specifically includes following steps:
Step S1: before carrying out ice-melt operation, port of export AC switched by flexible cable
Son is connected to 0.4kV alternating current power supply, Guan Bi AC switch, is full of by described battery energy storage system
Electricity；After fully charging, disconnect AC switch, remove described flexible cable；
Step S2: by out of service for icing circuit, is entered one one time by cuprum aluminum wire clamp
Flexible cable connects the biphase incoming end of A, B of icing circuit, and A, B of icing circuit are biphase
End carries out short circuit by shorting stub, measures the DC impedance of icing circuit homework circuit, and core
Calculate the output voltage of DC converter outfan after loading direct current thermal ice-melting electric current must not exceed
Its maximum operating voltage；
Step S3: the one end entering a flexible cable by is connected to the outlet of DC converter
Terminal, closed DC switchs, and starts DC converter, by the output current value of DC converter
It is arranged to direct current thermal ice-melting current value；Every time during loading current value stabilization, observe icing circuit
Access point, short circuit point, the temperature rise of observation station, if conductor temperature more than 40 degree, wire connects
Head temperature is paid close attention to when exceeding conductor temperature 10 degree；If conductor temperature more than 50 degree,
The temperature difference persistently raises and reduces loading current immediately during more than 15 degree, and stops operation；
Step S4: as shown in Figure 4, when the input terminal voltage of DC converter is more than outfan
During voltage, described DC converter works in buck pattern automatically, and the first brachium pontis works in buck
Pattern, the switching tube S4 of the second brachium pontis is in lasting cut-off state, by controlling the first brachium pontis
Dutycycle D of switching tube S11, it is achieved blood pressure lowering works, and input and output voltage relation is:
VO=Vi×D1；
Wherein, VOFor the output end voltage of described DC converter, ViFor described DC converter
Input terminal voltage；
As it is shown in figure 5, when the input terminal voltage of described DC converter is nearly equal to outfan electricity
During pressure, DC converter works in direct mode operation automatically, and the switching tube S1 of the first brachium pontis is in
Continuing closure state, the switching tube S4 of the second brachium pontis is in lasting cut-off state, input and output
Voltage relationship is:
VO=Vi×D1；
D1=1；
As shown in Figure 6, when the input terminal voltage of described DC converter is less than output end voltage,
DC converter works in boost pattern automatically, and the switching tube S1 of the first brachium pontis is in and continues
Closure state, the second brachium pontis works in boost pattern, by controlling the switching tube of the second brachium pontis
Dutycycle D of S44, it is achieved boosting work, input and output voltage relation is:
Step S5: after completing A, B biphase ice-melt operation, closes DC converter, disconnects DC
Switch, is substantially discharged three-phase line, then by the end short circuit of A, B, C three-phase,
The outlet terminal of DC switch is connected to the flexible cable transfer of B phase and is connected to C phase head end, opens
Twice C phase ice-melt operations are entered in exhibition one, and closed DC switchs, and start DC converter, by direct current
The output current value of changer is arranged to direct current thermal ice-melting current value, is loading electricity equally every time
When flow valuve is stablized, observe icing line access point, short circuit point, the temperature rise of observation station, such as phenolphthalein
Line temperature more than 40 degree, terminal temperature pays close attention to when exceeding conductor temperature 10 degree；
Conductor temperature more than 50 degree, the temperature difference persistently raises and reduces the most immediately during more than 15 degree and load electricity
Stream, and stop operation；
Step S6: after completing C phase ice-melt operation, the ice-melt operation of three-phase line completes the most,
Closing DC converter, disconnect DC switch, be substantially discharged three-phase line, dismounting is melted
Ice operation wiring, recovers three-phase line to state time out of service.
The foregoing is only presently preferred embodiments of the present invention, all according to scope of the present invention patent institute
Impartial change and the modification done, all should belong to the covering scope of the present invention.
Claims (6)
1. a power distribution network medium-voltage line direct current thermal ice-melting based on mobile battery energy storage device
Circuit, it is characterised in that: include that two way convertor, battery energy storage system, direct current become
Parallel operation, AC switch, DC switch；The exchange end of described two way convertor is through described
AC switch is connected to the power supply of described power distribution network medium-voltage line direct current thermal ice-melting circuit
Input, the DC terminal of described two way convertor is positive and negative with described battery energy storage system
Pole also connects, and the input of described DC converter is also with described battery energy storage system just
Negative pole also connects, and the outfan of described DC converter is connected to described through described DC switch
The outfan of power distribution network medium-voltage line direct current thermal ice-melting circuit, in order to be connected to icing
Circuit；Described battery energy storage system, two way convertor, DC converter, AC switch,
DC switch is integrated in semi-trailer movable type compartment.
A kind of power distribution network based on mobile battery energy storage device the most according to claim 1
Medium-voltage line direct current thermal ice-melting circuit, it is characterised in that: described battery energy storage system
For ferric phosphate lithium cell energy-storage system.
A kind of power distribution network based on mobile battery energy storage device the most according to claim 1
Medium-voltage line direct current thermal ice-melting circuit, it is characterised in that: described DC converter is
Symmetric double brachium pontis series direct current changer, including buffer circuit, LC filter circuit and
Two symmetrical brachium pontis.
A kind of power distribution network based on mobile battery energy storage device the most according to claim 3
Medium-voltage line direct current thermal ice-melting circuit, it is characterised in that: described DC converter is adopted
Use IGBT power device.
A kind of power distribution network based on mobile battery energy storage device the most according to claim 1
Medium-voltage line direct current thermal ice-melting circuit, it is characterised in that: line ball in described power distribution network
Road includes power distribution network 10kV, 20kV, 35kV circuit.
6. one kind based on the power distribution network based on mobile battery energy storage device described in claim 3
The method of medium-voltage line direct current thermal ice-melting circuit, it is characterised in that: include following step
Rapid:
Step S1: before carrying out ice-melt operation, port of export AC switched by flexible cable
Son is connected to 0.4kV alternating current power supply, Guan Bi AC switch, is full of by described battery energy storage system
Electricity；After fully charging, disconnect AC switch, remove described flexible cable；
Step S2: by out of service for icing circuit, is entered one one time by cuprum aluminum wire clamp
Flexible cable connects the biphase incoming end of A, B of icing circuit, and A, B of icing circuit are biphase
End carries out short circuit by shorting stub, measures the DC impedance of icing circuit homework circuit, and core
Calculate the output voltage of DC converter outfan after loading direct current thermal ice-melting electric current must not exceed
Its maximum operating voltage；
Step S3: the one end entering a flexible cable by is connected to the outlet of DC converter
Terminal, closed DC switchs, and starts DC converter, by the output current value of DC converter
It is arranged to direct current thermal ice-melting current value；Every time during loading current value stabilization, observe icing circuit
Access point, short circuit point, the temperature rise of observation station, if conductor temperature more than 40 degree, wire connects
Head temperature is paid close attention to when exceeding conductor temperature 10 degree；If conductor temperature more than 50 degree,
The temperature difference persistently raises and reduces loading current immediately during more than 15 degree, and stops operation；
Step S4: when the input terminal voltage of DC converter is more than output end voltage, described
DC converter works in buck pattern automatically, and the first brachium pontis works in buck pattern, and second
The switching tube S4 of brachium pontis is in lasting cut-off state, by controlling the switching tube S1 of the first brachium pontis
Dutycycle D1, it is achieved blood pressure lowering works, and input and output voltage relation is:
VO=Vi×D1；
Wherein, VOFor the output end voltage of described DC converter, ViFor described DC converter
Input terminal voltage；
When the input terminal voltage of described DC converter is nearly equal to output end voltage, direct current becomes
Parallel operation works in direct mode operation automatically, and the switching tube S1 of the first brachium pontis is in lasting closure state,
The switching tube S4 of the second brachium pontis is in lasting cut-off state, and input and output voltage relation is:
VO=Vi×D1；
D1=1；
When the input terminal voltage of described DC converter is less than output end voltage, DC converter
Automatically working in boost pattern, the switching tube S1 of the first brachium pontis is in lasting closure state,
Second brachium pontis works in boost pattern, by controlling the duty of the switching tube S4 of the second brachium pontis
Compare D4, it is achieved boosting work, input and output voltage relation is:
Step S5: after completing A, B biphase ice-melt operation, closes DC converter, disconnects DC
Switch, is substantially discharged three-phase line, then by the end short circuit of A, B, C three-phase,
The outlet terminal of DC switch is connected to the flexible cable transfer of B phase and is connected to C phase head end, opens
Twice C phase ice-melt operations are entered in exhibition one, and closed DC switchs, and start DC converter, by direct current
The output current value of changer is arranged to direct current thermal ice-melting current value, is loading electricity equally every time
When flow valuve is stablized, observe icing line access point, short circuit point, the temperature rise of observation station, such as phenolphthalein
Line temperature more than 40 degree, terminal temperature pays close attention to when exceeding conductor temperature 10 degree；
Conductor temperature more than 50 degree, the temperature difference persistently raises and reduces the most immediately during more than 15 degree and load electricity
Stream, and stop operation；
Step S6: after completing C phase ice-melt operation, the ice-melt operation of three-phase line completes the most,
Closing DC converter, disconnect DC switch, be substantially discharged three-phase line, dismounting is melted
Ice operation wiring, recovers three-phase line to state time out of service.
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| CN201610472517.XA CN105958414B (en) | 2016-06-24 | 2016-06-24 | Power distribution network medium-voltage line direct current thermal ice-melting circuit and method based on mobile battery energy storage device |
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| CN201610472517.XA CN105958414B (en) | 2016-06-24 | 2016-06-24 | Power distribution network medium-voltage line direct current thermal ice-melting circuit and method based on mobile battery energy storage device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482530A (en) * | 2017-09-20 | 2017-12-15 | 湖南省湘电试研技术有限公司 | Based on the Portable rural distribution exchange de-icing method and device for handing over orthogonal Two Stages |
| CN110829335A (en) * | 2019-11-18 | 2020-02-21 | 国网湖南省电力有限公司 | Prefabricated cabin type agricultural distribution network direct-current ice melting device and ice melting method thereof |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
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| CN205791405U (en) * | 2016-06-24 | 2016-12-07 | 国网福建省电力有限公司 | Power distribution network medium-voltage line direct current thermal ice-melting circuit based on mobile battery energy storage device |
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| US6027075A (en) * | 1997-06-16 | 2000-02-22 | Trustees Of Dartmouth College | Systems and methods for modifying ice adhesion strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482530A (en) * | 2017-09-20 | 2017-12-15 | 湖南省湘电试研技术有限公司 | Based on the Portable rural distribution exchange de-icing method and device for handing over orthogonal Two Stages |
| CN110829335A (en) * | 2019-11-18 | 2020-02-21 | 国网湖南省电力有限公司 | Prefabricated cabin type agricultural distribution network direct-current ice melting device and ice melting method thereof |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
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| Publication number | Publication date |
|---|---|
| CN105958414B (en) | 2017-11-17 |
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Effective date of registration: 20171130 Address after: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 257 Co-patentee after: State Grid Corporation of China Patentee after: State Grid Fujian Electric Power Co., Ltd. Co-patentee after: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. Co-patentee after: Economic technology academy of State Grid Fujian Electric Power Co., Ltd. Address before: 350003 Fuzhou Road, Fujian, No. 54, No. 257 Co-patentee before: State Grid Corporation of China Patentee before: State Grid Fujian Electric Power Co., Ltd. Co-patentee before: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. |