CN107359579B - Intensive direct-current ice melting device based on SVG and diode rectifier complementation - Google Patents
Intensive direct-current ice melting device based on SVG and diode rectifier complementation Download PDFInfo
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- CN107359579B CN107359579B CN201710801453.8A CN201710801453A CN107359579B CN 107359579 B CN107359579 B CN 107359579B CN 201710801453 A CN201710801453 A CN 201710801453A CN 107359579 B CN107359579 B CN 107359579B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses an intensive direct current deicing device based on complementation of SVG and a diode rectifier, which comprises a deicing transformer, the SVG and the diode rectifier, wherein the SVG comprises two SVG units, each SVG unit consists of a filter inductor and a cascade converter which are connected in series, each cascade converter consists of a plurality of converters which are formed by cascading all-control type switching devices, the converters are led out by adopting a three-phase star connection method and neutral points, the cascade converters of the two SVG units are connected to the same secondary winding of the deicing transformer after passing through respective filter inductors, the neutral points F of the two SVG units are connected with the positive electrode of the direct current side of the diode rectifier, the neutral point E is used as the positive electrode of the output of the intensive direct current deicing device, and the negative electrode of the direct current side of the diode rectifier is used as the negative electrode of the output of the intensive direct current deicing device. The SVG has the advantages of small capacity requirement, good deicing characteristic, high deicing reliability, small grid-connected harmonic current, and simultaneously realization of functions of deicing, reactive compensation and harmonic treatment.
Description
Technical Field
The invention relates to a deicing technology of a power transmission line in electrical engineering, in particular to an intensive direct current deicing device based on the complementation of SVG and a diode rectifier.
Background
The ice and snow disasters frequently occur in China, the transmission line is easy to break and fall down after ice is covered, and the safe operation and the power supply reliability of the power grid are seriously threatened. Therefore, various types of direct current ice melting devices are developed at home and abroad, and a technical means is provided for disaster resistance of the power grid. According to the structural principle, the existing direct-current ice melting device can be mainly divided into three types:
the first type is an uncontrolled rectification type direct current ice melting device using diodes to realize alternating current to direct current conversion (AC/DC), and for example, a rectifier based on diodes is disclosed in chinese patent document published in 5 months and 20 days 2009 with application number CN 200810031940.1. The device has simple structure and lower manufacturing cost; however, the output voltage cannot be continuously regulated, the controllability is poor, and in order to enable the same ice melting device to meet the ice melting requirements of a plurality of power transmission lines with different lengths and wire diameters, an ice melting transformer with a large number of gear positions and deep voltage regulation is required to be configured; and the ice melting device has ice melting function only and is difficult to expand, and the device utilization rate is low.
The second type is a phase control rectification type direct current ice melting device for realizing alternating current to direct current conversion by using a thyristor, for example, a rectifier based on the thyristor is disclosed in Chinese patent document with the application number of CN200810047959.5 published in 12 months and 3 days of 2008. The output ice melting voltage of the device is continuously adjustable, and the device has two functions of direct-current ice melting and reactive compensation, so that the device has higher utilization rate; however, the inherent characteristics of thyristor phase control rectification lead the grid-connected harmonic wave to be large, and a plurality of groups of high-capacity filter capacitor reactor groups are matched to meet the requirement of the grid-connected harmonic wave, so that the whole occupied area is large and the manufacturing cost is high.
The third is a full-control rectification type direct current ice melting device for realizing alternating current to direct current conversion by utilizing a turn-off device such as an IGBT (insulated gate bipolar transistor), and for example, a Chinese patent document with the application number of CN201210211925.1 published in 10/17 of 2012 discloses a rectifier formed based on the turn-off device. The device can generally have multiple functions of direct current deicing, reactive compensation, active filtering and the like, has small grid-connected harmonic wave, continuously adjustable deicing voltage and good technical indexes; however, the rated voltage and current of the converter need to be selected according to the maximum ice melting current and the maximum working voltage, so that the capacity of the converter is large (at least not lower than the ice melting capacity), and the unit capacity cost of the fully-controlled switching devices such as IGBT is far higher than that of the diode or the thyristor, so that the whole cost of the ice melting device is high, and the popularization and the application are difficult.
In addition, a novel deicing device (high voltage technology, 7 th period of 2016) having reactive compensation and active filtering functions and chinese patent document with application number CN201510138254.4 disclose a structure in which a STATCOM and a diode rectifier are connected in parallel to a deicing transformer, deicing is realized by using the diode rectifier and the deicing transformer, and the deicing transformer is multiplexed as a filtering reactance of the STATCOM, so that the whole device has deicing, reactive compensation and active filtering functions, and the capacity of the STATCOM and the capacity of the deicing can be independently optimized. However, the STATCOM converter and the diode rectifier are independent of each other and cannot work simultaneously, i.e. the STATCOM component cannot participate in direct current deicing. The capacity of the diode rectifier is configured according to the maximum ice melting capacity, and a plurality of gears are required to be set for ice melting due to discontinuous ice melting output voltage so as to adapt to the ice melting requirements of different lines; on the other hand, the device can not provide dynamic reactive power compensation and active filtering functions during ice melting, namely the ice melting function and the reactive power compensation function can only be added in a time-sharing way and can not be simultaneously combined.
Disclosure of Invention
The invention aims to solve the technical problems that: aiming at the problems in the prior art, the invention provides an intensive direct current deicing device with low manufacturing cost, which is formed by complementarily combining a diode rectifier with SVG with good technical indexes, has various functions, good technical indexes and moderate manufacturing cost, is based on complementation of the SVG and the diode rectifier, adopts a structure that the diode rectifier and the SVG direct current side are connected in series to ensure that the diode rectifier and the SVG direct current side respectively only provide partial deicing voltage so as to reduce the capacity requirement of the SVG and ensure that the deicing voltage and the current are continuously controllable, adopts a structure that an uncontrolled rectifier and the SVG alternating current side are parallel to ensure that dynamic reactive compensation and harmonic treatment can be performed while direct current deicing is performed, and has the advantages of small capacity requirement of the SVG, good deicing characteristic, high deicing reliability, small grid-connected harmonic current, reactive compensation and harmonic treatment functions and simultaneously realizing the functions.
In order to solve the technical problems, the invention adopts the following technical scheme:
the intensive direct current deicing device based on the complementation of SVG and diode rectifier comprises a deicing transformer, SVG and diode rectifier, wherein the alternating current sides of the SVG and diode rectifier are respectively connected with the deicing transformer, and the direct current sides of the SVG and diode rectifier are serially connected for output.
Preferably, the SVG comprises two SVG units, the SVG units are formed by connecting filter inductors and cascade converters in series, the cascade converters are formed by cascading a plurality of converters, the converters are formed by fully-controlled switching devices and are led out by adopting a three-phase star connection method, the cascade converters of the two SVG units are respectively connected to the same secondary winding of the ice melting transformer after passing through the filter inductors, the neutral points E and the neutral points F led out by all the converters of the two SVG units are respectively led out to serve as direct current voltage output ends of the SVG, the neutral point F led out by one SVG unit is connected with the positive electrode of the direct current side of a diode rectifier, the neutral point E led out by the other SVG unit serves as the positive electrode of the output of the intensive direct current ice melting device, and the negative electrode of the direct current side of the diode rectifier serves as the negative electrode of the output of the intensive direct current ice melting device.
Preferably, control ends of the cascade type converters of the two SVG units in the SVG are connected with neutral point offset control equipment for regulating and controlling output voltage of the SVG.
Preferably, the ice melting transformer is a multi-winding transformer with one primary winding and at least two secondary windings, and the alternating current sides of the SVG and the diode rectifier are respectively connected with different secondary windings of the ice melting transformer.
Preferably, the diode Guan Zhengliu is a diode-uncontrolled rectifier and the ice-melting transformer is a three-winding transformer with one primary winding and two secondary windings.
Preferably, the diode Guan Zhengliu is a diode 6 pulse uncontrolled rectifier, and the ice-melting transformer is a three-winding transformer with one primary winding and two secondary windings.
Preferably, the diode Guan Zhengliu is a diode 12 pulse wave uncontrolled rectifier formed by connecting two diode 6 pulse wave uncontrolled rectifiers in series, the ice melting transformer is a four-winding transformer with one primary winding and three secondary windings, and the alternating current sides of the two diode 6 pulse wave uncontrolled rectifiers forming the diode 12 pulse wave uncontrolled rectifier are respectively connected with different secondary windings of the ice melting transformer.
The intensive direct current ice melting device based on SVG and diode rectifier complementation has the following advantages:
1. SVG capacity requirements are small. The SVG capacity of the present invention may be much smaller than the ice melting capacity, and the difference between the SVG capacity and the ice melting capacity may be provided by a relatively inexpensive diode rectifier. Compared with a direct-current ice melting mode which simply relies on SVG to realize ice melting, the capacity requirement of SVG is greatly reduced, and the manufacturing cost of SVG is greatly reduced.
2. The ice melting property is good. The DC side ice melting output voltage and current of the device can be continuously adjustable by SVG, so that the ice melting requirements of different lines can be more easily matched; at the same time, when the ice is melted, SVG can still provide dynamic reactive compensation and harmonic compensation functions to the grid.
3. The ice melting reliability is high. When any one of the SVG or the diode rectifier breaks down, the other converter can still provide partial ice melting capability, and only the output ice melting voltage range is small, namely the device has certain fault tolerance and ice melting standby property, so that the ice melting reliability is high.
4. The grid-connected harmonic current is small, a low-order filter bank is not required to be additionally configured like a thyristor phase-control rectification type ice melting device, and even the existing harmonic wave in the power grid can be treated when needed.
5. The system has the functions of ice melting, reactive compensation and harmonic wave treatment, and the functions can be realized simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
Embodiment one:
as shown in fig. 1, the intensive direct current deicing device based on the complementation of SVG and diode rectifier in this embodiment includes a deicing transformer 1, SVG2 and a diode rectifier 3, where the ac sides of SVG2 and diode rectifier 3 are respectively connected with the deicing transformer 1, and the dc sides of SVG2 and diode rectifier 3 are serially output.
As shown in fig. 1, the SVG2 includes two SVG units, each SVG unit is formed by connecting a filter inductor and a cascade converter in series, each cascade converter is formed by connecting a plurality of converters in cascade, each converter is formed by a fully-controlled switching device (for example, an IGBT in this embodiment) and is led out by a three-phase star connection method, the cascade converters of the two SVG units are respectively connected to the same secondary winding of the ice melting transformer 1 after passing through the filter inductor, the neutral points E and the neutral points F led out by all the converters of the two SVG units are respectively led out as dc voltage output ends of the SVG2, the neutral point F led out by one SVG unit is connected with the positive electrode of the dc side of the diode rectifier 3, the neutral point E led out by the other SVG unit is used as the positive electrode of the output of the intensive dc ice melting device, and the negative electrode of the dc side of the diode rectifier 3 is used as the negative electrode of the output of the intensive dc ice melting device.
In this embodiment, control ends of cascaded converters of two SVG units in SVG2 are connected with a neutral point offset control device for regulating and controlling output voltage of SVG 2.
In this embodiment, the ice melting transformer 1 is a multi-winding transformer with one primary winding and at least two secondary windings, the primary winding of the ice melting transformer 1 is connected to a 10kV or 35kV bus of the transformer substation, and the ac sides of the SVG2 and the diode rectifier 3 are respectively connected to different secondary windings of the ice melting transformer 1.
In this embodiment, the diode rectifier 3 is a diode uncontrolled rectifier, and the ice-melting transformer 1 is a three-winding transformer with one primary winding and two secondary windings. In addition, the diode rectifier 3 can also be selected from other rectifiers according to the requirement.
From the direct current side, the output direct current voltage of the intensive direct current ice melting device of the embodiment is provided by the SVG2 and the diode rectifier 3 together, and is equal to the linear superposition of the output direct current voltages of the SVG2 and the diode rectifier, namely:
U dc =U 1_SVG +U 2_Idode （1）
in the formula (1), the components are as follows,U dc for the direct voltage actually output by the ice melting device,U 1_SVG the dc output voltage (i.e., the voltage difference between the two center points) representing SVG2, both in magnitude and polarity may be controlled by SVG2,U 2_Idode the output dc voltage of the diode rectifier 3 is shown. DC output voltage to SVG2U 1_SVG The neutral point offset control device for adjusting and controlling the output voltage of SVG2 can be adjusted and controlled by adopting a neutral point offset control method, the numerical value of the neutral point offset control device can be continuously adjusted within a certain range, and a specific voltage and current adjusting method is disclosed in a literature (automatic electric power system, 2013, 12) of a hybrid direct-current ice melting power supply with STATCOM (static synchronous compensator) function. Output dc voltage to diode rectifier 3U 2_Idode The value of the power supply is mainly dependent on the secondary side output voltage of the fusion transformer, and the power supply can be regulated and controlled by configuring a plurality of secondary side gears of the transformer, and can also be not regulated and controlled by a single gear. In the above configuration, the SVG2 and the diode rectifier 3 are connected in series on the dc sideIn the parallel connection, the output direct current of the two is equal to the ice melting current, but the output direct voltage only occupies a part of the ice melting output voltage, so the capacities of the SVG and the diode rectifier can be far smaller than the maximum ice melting capacity required by line ice melting.
From the ac side, the overall grid-connected current of the intensive dc ice melting device of this embodiment is determined by the SVG2 and the diode rectifier 3, and although the diode rectifier 3 is not controllable, the ac side current of the SVG2 is freely controllable in a larger range, so that the grid-connected current is freely controllable. It is therefore approved by SVG for dynamic reactive compensation and active filtering while melting ice.
For example, the maximum ice melting current required by the ice coating line of the intensive direct current ice melting device of the embodiment is 2500A, the maximum ice melting voltage is 8000V, and thus the ice melting capacity requirement is 20MW; in addition, the reactive compensation capacity required by the transformer substation is 10Mvar, and the transformer substation has 10kV bus voltage. According to the condition parameters, according to the principle that the capacity of SVG is as small as possible to reduce the overall cost, the capacity of SVG2 is selected to be 5Mvar multiplied by 2=10Mvar, the rated current is 1000A, the rated voltage is 2.9kV, and each phase is connected in series by adopting 5 converters (full-bridge type power units). The DC bus voltage of each converter is 900V, the output AC voltage is 420V, and the IGBT with 1700V/2400A specification is selected. The output voltage of the SVG neutral point can be continuously adjustable between-4.0 kV and 4.0 kV. The rated output direct current voltage of the diode rectifier 3 is 4kV, the rated output direct current is 2.5kA, and the rated output capacity is 10MW; the rated input current of the alternating current side is 3.2kV and the rated input current is 1.8kA. The ice melting transformer 1 is a three-winding transformer, and the rated voltage is 10kV/2.9kV/3.2kV, and the rated capacity is 20MVA/10MVA/10MVA.
In summary, in the intensive direct current ice melting device of the present embodiment, the ac sides of the SVG2 and the diode rectifier 3 are respectively connected to different secondary windings of the ice melting transformer 1, and the dc sides are serially connected to output, the diode rectifier 3 and the SVG2 only provide a part of the ice melting direct current voltage, the capacity of the SVG2 can be far smaller than the ice melting capacity, the balance is provided by the diode rectifier 3, and the ice melting voltage and current can be continuously controllable by adjusting the neutral point offset voltage of the SVG 2; the diode rectifier 3 and the SVG2 are parallel and run simultaneously on the alternating current side, so that the intensive direct current deicing device of the embodiment can perform dynamic reactive compensation and harmonic wave treatment while DC deicing, and the diode rectifier 3 with low cost and the SVG2 with good technical indexes are complementarily combined, so that the whole technical indexes of the DC deicing device are good, the functions are various, the manufacturing cost is moderate, and the comprehensive cost performance is high.
Embodiment two:
as shown in fig. 2, the diode rectifier 3 is a diode 6 pulse wave uncontrolled rectifier, and the ice-melting transformer 1 is a three-winding transformer with one primary winding and two secondary windings.
Embodiment III:
as shown in fig. 3, the diode rectifier 3 is a diode 12 pulse wave uncontrolled rectifier formed by connecting two diode 6 pulse wave uncontrolled rectifiers in series, the ice melting transformer 1 is a four-winding transformer with one primary winding and three secondary windings, and the ac sides of the two diode 6 pulse wave uncontrolled rectifiers forming the diode 12 pulse wave uncontrolled rectifier are respectively connected with different secondary windings of the ice melting transformer 1.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (6)
1. The intensive direct current deicing device based on the complementation of SVG and a diode rectifier is characterized by comprising a deicing transformer (1), SVG (2) and a diode rectifier (3), wherein alternating current sides of the SVG (2) and the diode rectifier (3) are respectively connected with the deicing transformer (1), direct current sides of the SVG (2) and the diode rectifier (3) are connected in series for output, the SVG (2) comprises two SVG units, the SVG units are formed by connecting filter inductors and cascade converters in series, the cascade converters are formed by cascading a plurality of converters, the converters are respectively connected to the same secondary winding of the ice transformer (1) after passing through respective filter inductors, the neutral points E and the neutral points F led out by all the two SVG units are respectively led out as direct current voltage output ends of the SVG (2), and the neutral points F led out by one SVG unit and the positive pole F of the other SVG unit are respectively led out as direct current voltage output ends of the SVG (2), and the direct current collector side of the SVG units is approximately led out by the other SVG units (3) are connected with the positive pole and the direct current collector of the SVG unit (3); the output direct current voltage of the intensive direct current ice melting device is provided by the SVG (2) and the diode rectifier (3) together, and is equal to the linear superposition of the direct current voltage output by the SVG (2) and the diode rectifier (3) respectively, and the function expression is as follows:
U dc =U 1_SVG +U 2_Idode （1）
in the formula (1), the components are as follows,U dc for the output DC voltage of the intensive DC ice melting device,U 1_SVG the dc output voltage of SVG (2),U 2_Idode the output DC voltage of the diode rectifier (3) is shown.
2. The intensive direct current ice melting device based on the complementation of SVG and a diode rectifier according to claim 1, wherein the control ends of the cascade converters of the two SVG units in the SVG (2) are connected with neutral point offset control equipment for regulating and controlling the output voltage of the SVG (2).
3. The intensive direct current deicing device based on SVG and diode rectifier complementation according to claim 1 or 2, characterized in that the deicing transformer (1) is a multi-winding transformer with one primary winding and at least two secondary windings, the alternating current sides of the SVG (2) and diode rectifier (3) are respectively connected with different secondary windings of the deicing transformer (1).
4. An intensive dc de-icing device based on SVG and diode rectifier complementation according to claim 3, characterized in that the diode Guan Zhengliu device (3) is a diode uncontrolled rectifier and the de-icing transformer (1) is a three-winding transformer with one primary winding and two secondary windings.
5. The intensive direct current deicing device based on SVG and diode rectifier complementation of claim 3, wherein the diode Guan Zhengliu device (3) is a diode 6 pulse uncontrolled rectifier, and the deicing transformer (1) is a three-winding transformer with one primary winding and two secondary windings.
6. The intensive direct current deicing device based on the complementation of SVG and diode rectifiers according to claim 3, wherein the diode Guan Zhengliu device (3) is a diode 12 pulse wave uncontrolled rectifier formed by connecting two diode 6 pulse wave uncontrolled rectifiers in series, the deicing transformer (1) is a four-winding transformer with one primary winding and three secondary windings, and the alternating current sides of the two diode 6 pulse wave uncontrolled rectifiers forming the diode 12 pulse wave uncontrolled rectifier are respectively connected with different secondary windings of the deicing transformer (1).
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| CN108614949B (en) * | 2018-05-17 | 2021-09-10 | 湖南大学 | Harmonic current distribution calculation method for transformer integrated regulation and control filtering system |
| CN110137893A (en) * | 2019-06-20 | 2019-08-16 | 贵州电网有限责任公司 | A kind of full-bridge MMC type ice-melt experimental rig and method |
| CN110224365A (en) * | 2019-06-20 | 2019-09-10 | 贵州电网有限责任公司 | DC de-icing device and method based on diode rectification and full-bridge MMC inverter |
| CN112234567A (en) * | 2020-11-06 | 2021-01-15 | 国网湖南省电力有限公司 | Novel uncontrolled direct current ice melting device and ice melting method thereof |
| CN113161965B (en) * | 2021-03-09 | 2022-07-19 | 湖南防灾科技有限公司 | Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof |
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