CN104701796A - Intensive type DC de-icing device topology structure - Google Patents
Intensive type DC de-icing device topology structure Download PDFInfo
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- CN104701796A CN104701796A CN201510138254.4A CN201510138254A CN104701796A CN 104701796 A CN104701796 A CN 104701796A CN 201510138254 A CN201510138254 A CN 201510138254A CN 104701796 A CN104701796 A CN 104701796A
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- ice
- icing
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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
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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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
- Y02E40/30—Reactive power compensation
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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 type DC de-icing device topology structure. The intensive type DC de-icing device topology structure comprises a constant impedance low-loss connection transformer, a de-icing branch, a DC de-icing device main controller, an operation mode transformation device, a reactive compensation and active filter branch and a transformer substation bus current and voltage signal acquiring device; the transformer substation bus current and voltage signal acquiring device is connected with a DC de-icing device main controller; the control end of a static reactive compensation and active filter part is connected with the DC de-icing device main controller; the input end of the operation mode transformation mode is connected with an C bus of a transformer substation through the constant impedance low-loss connection transformer, and while the output end of the operation mode transformation mode is respectively connected with the de-icing branch and the reactive compensation and active filter branch. The intensive type DC de-icing device topology structure can perform de-icing, reactive compensation and active filter, and is reliable to run; the de-icing and the reactive compensating capacity can be independently configured; therefore, the guidance is provided for the multifunctional topology structure of the de-icing device; the intensive type DC de-icing device topology structure can be widely applied to various transformer substations.
Description
Technical field
The present invention relates to electrical engineering technical field, be specifically related to a kind of intensive DC de-icing device topological structure.
Background technology
DC de-icing device is that transmission line reply ice damage provides effective ice-melt means, but DC de-icing device only in the winter time line ice coating time use, utilance is low, and device easily need not cause device damage for a long time, is in operation and there is very large potential safety hazard.Therefore, under, the reliable prerequisite of ice melting operation simple in guarantee deicing device structure, carry out can realize deicing device Function Extension Study on topology, improve deicing device utilance, there is important technology and economic worth.
Home and abroad minority colleges and universities and R&D institution have carried out part research to the multi-functional topological structure of DC de-icing device, to hold concurrently SVC type DC de-icing device topological structure based on ice-melt at present, there is following defect in the device developed with this topological structure: defect one, operation harmonic wave is large, device input side needs to increase a large amount of filters, heating is serious, and power device needs to adopt complicated water-cooling system; Defect two, device needs to configure capacitive reactive power and the idle output of perception that a large amount of reactors realizes waiting capacity, and cost is high, floor space is large; Defect three, apparatus structure is complicated, and operation maintenance workload is large, and modifier function operational mode needs to carry out a large amount of grid switching operation, and operational reliability is lower, and SVC functions expanding effect is poor.Therefore, to hold concurrently SVC type DC de-icing device feature for ice-melt, and in conjunction with transformer station's functional requirement, in the urgent need to carrying out, operation harmonic wave is low, caloric value is little, structure is simple, reliability is high, and effectively can improve the intensive deicing device Study on topology of utilization ratio of device, for the structural design of device provides guidance with final development, effectively to solve the low problem of deicing device utilization rate.
Summary of the invention
The technical problem to be solved in the present invention is: for the problems referred to above of prior art, there is provided that a kind of operational reliability is high can realize having concurrently ice-melt and reactive power compensation and active power filtering function, operational reliability is high, ice-melt capacity and reactive compensation capacity can independent optimization configure, for the multi-functional Study on topology of deicing device and device development provide effective guidance, the intensive DC de-icing device topological structure of all kinds of transformer station can be widely used in.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of intensive DC de-icing device topological structure, comprise constant impedance low-loss connection transformer, ice-melt branch road and DC de-icing device master controller, the control end of described ice-melt branch road is connected with DC de-icing device master controller, described topological structure also comprises operational mode conversion equipment, for with the capacitor and Reactor banks cooperation of transformer station to realize the reactive power compensation of static reactive and active power filtering and active power filtering branch road and for the substation bus bar electric current of the electric current that gathers transformer station's ac bus and voltage signal and voltage signal acquisition device, described reactive power compensation and active power filtering branch road comprise at least one static reactive and active power filtering parts, the output of described substation bus bar electric current and voltage signal acquisition device is connected with DC de-icing device master controller, the control end of described static reactive and active power filtering parts is connected with DC de-icing device master controller, the input of described operational mode conversion equipment is connected with the ac bus of transformer station by constant impedance low-loss connection transformer, the output of described operational mode conversion equipment is connected with ice-melt branch road and each static reactive and active power filtering parts respectively.
Preferably, described ice-melt branch road comprises low harmony wave DC ice melting voltage conversion unit and is switched to the DC ice-melting switching device shifter different DC ice-melting being carried out ice-melt for direct voltage, the power input of described low harmony wave DC ice melting voltage conversion unit is connected with the output of operational mode conversion equipment, the power output end of described low harmony wave DC ice melting voltage conversion unit is connected with DC ice-melting switching device shifter, and the control end of described low harmony wave DC ice melting voltage conversion unit is connected with DC de-icing device master controller.
Preferably, the ice-melt capacity of described low harmony wave DC ice melting voltage conversion unit is 25MW.
Preferably, in described reactive power compensation and active power filtering branch road, total static reactive capacity of all static reactives and active power filtering parts is ± 15Mvar.
Preferably, the quantity comprising static reactive and active power filtering parts in described reactive power compensation and active power filtering branch road is two, and the static reactive capacity of each static reactive and active power filtering parts is ± 7.5Mvar.
Preferably; described topological structure also comprises unit failure analysis and diagnosis device and overcurrent and over-pressure safety device; the input of described unit failure analysis and diagnosis device is connected with DC de-icing device master controller, constant impedance low-loss connection transformer respectively; the output of described unit failure analysis and diagnosis device is connected with the control end of overcurrent and over-pressure safety device, and described overcurrent and over-pressure safety device arranged in series are between constant impedance low-loss connection transformer and the ac bus of transformer station.
Intensive DC de-icing device topological structure of the present invention has following advantage:
1, the present invention includes ice-melt branch road and for the capacitor and Reactor banks cooperation with transformer station to realize reactive power compensation and the active power filtering branch road of static reactive and active power filtering, can effective implement device functions expanding, have ice-melt and reactive power compensation and active power filtering function concurrently, low harmony wave DC ice melting can either be realized, static reactive can be realized again with Substation Reactive-power Compensation electricity container and Reactor banks cooperation, realize the functions such as transformer station 10kV side 13 times and following harmonic wave active filtering, improve intensive deicing device utilization rate.
2, the present invention includes ice-melt branch road and for the capacitor and Reactor banks cooperation with transformer station to realize reactive power compensation and the active power filtering branch road of static reactive and active power filtering, ice-melt branch road and reactive power compensation and active power filtering branch road can be divided into by function, two branch road functional independences, but it is interrelated, simplify device Topology Structure Design, intensive deicing device ice-melt parts can be reached succinct, run the requirement of high reliability, existing DC de-icing device can be overcome owing to not using the defect easily causing device damage for a long time, the operational reliability of effective raising DC de-icing device.
3, the present invention can be divided into ice-melt branch road and reactive power compensation and active power filtering branch road by function, device ice-melt capacity and reactive compensation capacity can configure by separately optimizing, and reactive power compensation and active power filtering branch road comprise at least one static reactive and active power filtering parts, can the static reactive capacity of each static reactive of flexible configuration and active power filtering parts, deicing device as intensive in 220kV transformer station, ice-melt capacity is 25MW, static reactive capacity is ± 15Mvar, breach deicing device ice-melt and reactive power compensation must with the restriction of capacity configuration, intensive deicing device volume and equipment investment can be effectively reduced, can the design of optimization device rated capacity.
4, the present invention system can solve the problem such as structure optimization, rated capacity configuration, functions expanding of DC de-icing device, for the intensive deicing device of development 220kV transformer station provides a kind of economic, reliable, effective topological structure, effective guidance can be provided for the multi-functional Study on topology of deicing device and device development, all kinds of transformer station can be widely used in.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of the embodiment of the present invention.
Marginal data: 1, constant impedance low-loss connection transformer; 2, ice-melt branch road; 21, low harmony wave DC ice melting voltage conversion unit; 22, DC ice-melting switching device shifter; 3, DC de-icing device master controller; 4, operational mode conversion equipment; 5, reactive power compensation and active power filtering branch road; 50, capacitor and Reactor banks; 51, static reactive and active power filtering parts; 6, substation bus bar electric current and voltage signal acquisition device; 7, unit failure analysis and diagnosis device; 8, overcurrent and over-pressure safety device.
Embodiment
Figure 1 shows that the present invention integrates an embodiment of the intensive DC de-icing device topological structure of reactive power compensation and active power filtering, 12.5kV direct voltage output can be realized, its DC ice melting capacity is 25MW, static reactive capacity is ± 15Mvar, can carry out active power filtering to 13 times and following low-order harmonic.Hereafter will be specifically described the present invention in conjunction with embodiment illustrated in fig. 1.
As shown in Figure 1, the intensive DC de-icing device topological structure of the present embodiment comprises constant impedance low-loss connection transformer 1, ice-melt branch road 2 and DC de-icing device master controller 3, the control end of ice-melt branch road 2 is connected with DC de-icing device master controller 3, topological structure also comprises operational mode conversion equipment 4, for with transformer station capacitor and Reactor banks 50 cooperation to realize the reactive power compensation of static reactive and active power filtering and active power filtering branch road 5 and for the substation bus bar electric current of the electric current that gathers transformer station's ac bus and voltage signal and voltage signal acquisition device 6, reactive power compensation and active power filtering branch road 5 comprise at least one static reactive and active power filtering parts 51, the output of substation bus bar electric current and voltage signal acquisition device 6 is connected with DC de-icing device master controller 3, the control end of static reactive and active power filtering parts 51 is connected with DC de-icing device master controller 3, the input of operational mode conversion equipment 4 is connected with the ac bus of transformer station by constant impedance low-loss connection transformer 1, the output of operational mode conversion equipment 4 is connected with ice-melt branch road 2 and each static reactive and active power filtering parts 51 respectively.
In the present embodiment, the input of constant impedance low-loss connection transformer 1 takes over the output of stream and over-pressure safety device 8, being then connected with the input of operational mode conversion equipment 4 of constant impedance low-loss connection transformer 1; Constant impedance low-loss connection transformer 1 specifically adopts commercially available BYQHR-5kV type 5kV constant impedance low-loss connection transformer.DC de-icing device master controller 3 specifically adopts commercially available ZKZQ-220V type DC de-icing device master controller.The output of operational mode conversion equipment 4 is connected respectively with the input of low harmony wave DC ice melting voltage conversion unit 21, First static reactive and active power filtering parts 51, second static reactive and active power filtering parts 51 respectively, in the present embodiment, operational mode conversion equipment 4 specifically adopts commercially available ZHRB-12kV type ice-melt mode conversion equipment.Static reactive and active power filtering parts 51 are for being used for existing equipment (capacitor and the Reactor banks 50) cooperation of reactive power compensation to realize static reactive and active power filtering with transformer station, see Fig. 1, transformer station is used for that the existing equipment (capacitor and Reactor banks 50) of reactive power compensation is same to be also connected with the ac bus of transformer station.In the present embodiment, static reactive and active power filtering parts 51 specifically adopt commercially available JZWGFS-5KV/7.5 type static reactive and active power filtering parts.Substation bus bar electric current and voltage signal acquisition device 6 are for gathering electric current and the voltage signal of transformer station's ac bus, and substation bus bar electric current and voltage signal acquisition device 6 specifically adopt commercially available DLYCJ-15V type electric current and voltage signal acquisition device.
As shown in Figure 1, ice-melt branch road 2 comprises low harmony wave DC ice melting voltage conversion unit 21 and is switched to the DC ice-melting switching device shifter 22 different DC ice-melting being carried out ice-melt for direct voltage, the power input of low harmony wave DC ice melting voltage conversion unit 21 is connected with the output of operational mode conversion equipment 4, the power output end of low harmony wave DC ice melting voltage conversion unit 21 is connected with DC ice-melting switching device shifter 22, and the control end of low harmony wave DC ice melting voltage conversion unit 21 is connected with DC de-icing device master controller 3.
In the present embodiment, low harmony wave DC ice melting voltage conversion unit 21 is for becoming direct voltage output by operational mode conversion equipment 4 output voltage, and low harmony wave DC ice melting voltage conversion unit 21 specifically adopts commercially available ZLQDX-12kV type low harmony wave DC ice melting voltage conversion unit; DC ice-melting switching device shifter 22 is switched in different DC ice-melting for direct voltage and carries out ice-melt, and DC ice-melting switching device shifter 22 specifically adopts commercially available ZHRB-12kV type DC ice-melting switching device shifter.
In the present embodiment, the ice-melt capacity of low harmony wave DC ice melting voltage conversion unit 21 is 25MW.In addition, the ice-melt capacity of low harmony wave DC ice melting voltage conversion unit 21 can also be changed according to actual needs.Need to say, due between the present embodiment ice-melt branch road 2 and reactive power compensation and active power filtering branch road 5 in essence separate, be independent of each other, therefore the ice-melt capacity of the present embodiment and reactive compensation capacity can configure by separately optimizing.Such as, in the present embodiment, in reactive power compensation and active power filtering branch road 5, total static reactive capacity separately optimizing of all static reactives and active power filtering parts 51 is configured to ± 15Mvar.
Certainly, being ± 15Mvar to realize total static reactive capacity, the static reactive of different capabilities, varying number and active power filtering parts 51 can be selected as required to carry out combining reaching the demand.Such as, in the present embodiment, the quantity comprising static reactive and active power filtering parts 51 in reactive power compensation and active power filtering branch road 5 is two, and the static reactive capacity of each static reactive and active power filtering parts 51 is ± 7.5Mvar.
As shown in Figure 1; the present embodiment also comprises unit failure analysis and diagnosis device 7 and overcurrent and over-pressure safety device 8; the input of unit failure analysis and diagnosis device 7 is connected with DC de-icing device master controller 3, constant impedance low-loss connection transformer 1 respectively; the output of unit failure analysis and diagnosis device 7 is connected with the control end of overcurrent and over-pressure safety device 8, and overcurrent and over-pressure safety device 8 arranged in series are between constant impedance low-loss connection transformer 1 and the ac bus of transformer station.
In the present embodiment, unit failure analysis and diagnosis device 7 is for by constant impedance low-loss connection transformer 1, the status signal (voltage and current signal) that DC de-icing device master controller 3 exports carries out accident analysis and process, to determine that overcurrent and over-pressure safety device 8 are the need of enforcement overcurrent or overvoltage protection, unit failure analysis and diagnosis device 7 specifically adopts commercially available GZZD-220V type malfunction analysis and problem shpoting device, what needs were said is, determine whether needing implementing according to voltage and current signal the function carried that overcurrent or overvoltage protection are GZZD-220V type malfunction analysis and problem shpoting device.In the present embodiment; the voltage of the ac bus of transformer station is 10kV; 10kV ac bus is connected with the input of Reactor banks 50 with overcurrent and over-pressure safety device 8, capacitor respectively; and overcurrent and over-pressure safety device 8 export termination constant impedance low-loss connection transformer 1 input, overcurrent and over-pressure safety device 8 adopt commercially available BHDLY-10kV type overcurrent and over-pressure safety device.
The course of work of the intensive DC de-icing device topological structure of the present embodiment is as follows: the voltage that overcurrent and over-pressure safety device 8 input is realized variable reduced output voltage by constant impedance low-loss connection transformer 1, and output rated voltage is 5kV; Voltage that constant impedance low-loss connection transformer 1 exports by operational mode conversion equipment 4 is selected to be connected with ice-melt branch road 2 or reactive power compensation and active power filtering branch road 5, when operational mode conversion equipment 4 is selected to be connected with ice-melt branch road 2, under the present embodiment runs on ice-melt mode; When operational mode conversion equipment 4 is selected to be connected with reactive power compensation and active power filtering branch road 5, under the present embodiment runs on reactive power compensation and active power filtering pattern.(1) under ice-melt mode, under the control of DC de-icing device master controller 3, the 5kV that operational mode conversion equipment 4 exports by low harmony wave DC ice melting voltage conversion unit 21 carries out voltage transitions; The direct voltage that low harmony wave DC ice melting voltage conversion unit 21 exports is switched in different DC ice-melting and carries out effective ice-melt by DC ice-melting switching device shifter 22, exports rated direct voltage 12.5kV and electric current 2000A.(2) under reactive power compensation and active power filtering pattern, under the control of DC de-icing device master controller 3, operational mode conversion equipment 4 output voltage same-phase raises or reduces rear output by two static reactives and active power filtering parts 51, and then by operational mode conversion equipment 4, constant impedance low-loss connection transformer 1, be connected with the 10kV ac bus of transformer station after overcurrent and over-pressure safety device 8, the voltage and current information that DC de-icing device master controller 3 exports according to substation bus bar electric current and voltage signal acquisition device 6, jointly controlling the capacitor of two static reactives and active power filtering parts 51 and transformer station and Reactor banks 50 realizes substation bus bar electric current, voltage carries out static reactive or active power filtering.No matter be under ice-melt mode or reactive power compensation and active power filtering pattern; the electric current that unit failure analysis and diagnosis device 7 all can export according to constant impedance low-loss connection transformer 1 and DC de-icing device master controller 3 and voltage status information judge; to determine that overcurrent and over-pressure safety device 8 are the need of enforcement overcurrent or overvoltage protection; if overcurrent and over-pressure safety device 8 need overcurrent or overvoltage protection, then implement overcurrent or overvoltage protection to protect the electric equipment be positioned on rear side of overcurrent and over-pressure safety device 8 by overcurrent and over-pressure safety device 8.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. an intensive DC de-icing device topological structure, comprise constant impedance low-loss connection transformer (1), ice-melt branch road (2) and DC de-icing device master controller (3), the control end of described ice-melt branch road (2) is connected with DC de-icing device master controller (3), it is characterized in that: described topological structure also comprises operational mode conversion equipment (4), for with capacitor and Reactor banks (50) cooperation of transformer station to realize the reactive power compensation of static reactive and active power filtering and active power filtering branch road (5) and for the substation bus bar electric current of the electric current that gathers transformer station's ac bus and voltage signal and voltage signal acquisition device (6), described reactive power compensation and active power filtering branch road (5) comprise at least one static reactive and active power filtering parts (51), the output of described substation bus bar electric current and voltage signal acquisition device (6) is connected with DC de-icing device master controller (3), the control end of described static reactive and active power filtering parts (51) is connected with DC de-icing device master controller (3), the input of described operational mode conversion equipment (4) is connected with the ac bus of transformer station by constant impedance low-loss connection transformer (1), the output of described operational mode conversion equipment (4) is connected with ice-melt branch road (2) and each static reactive and active power filtering parts (51) respectively.
2. intensive DC de-icing device topological structure according to claim 1, it is characterized in that: described ice-melt branch road (2) comprises low harmony wave DC ice melting voltage conversion unit (21) and is switched to the DC ice-melting switching device shifter (22) different DC ice-melting being carried out ice-melt for direct voltage, the power input of described low harmony wave DC ice melting voltage conversion unit (21) is connected with the output of operational mode conversion equipment (4), the power output end of described low harmony wave DC ice melting voltage conversion unit (21) is connected with DC ice-melting switching device shifter (22), the control end of described low harmony wave DC ice melting voltage conversion unit (21) is connected with DC de-icing device master controller (3).
3. intensive DC de-icing device topological structure according to claim 2, is characterized in that: the ice-melt capacity of described low harmony wave DC ice melting voltage conversion unit (21) is 25MW.
4. the intensive DC de-icing device topological structure according to claim 1 or 2 or 3, is characterized in that: in described reactive power compensation and active power filtering branch road (5), total static reactive capacity of all static reactives and active power filtering parts (51) is ± 15Mvar.
5. intensive DC de-icing device topological structure according to claim 4, it is characterized in that: the quantity comprising static reactive and active power filtering parts (51) in described reactive power compensation and active power filtering branch road (5) is two, and the static reactive capacity of each static reactive and active power filtering parts (51) is ± 7.5Mvar.
6. intensive DC de-icing device topological structure according to claim 5, it is characterized in that: described topological structure also comprises unit failure analysis and diagnosis device (7) and overcurrent and over-pressure safety device (8), the input of described unit failure analysis and diagnosis device (7) respectively with DC de-icing device master controller (3), constant impedance low-loss connection transformer (1) is connected, the output of described unit failure analysis and diagnosis device (7) is connected with the control end of overcurrent and over-pressure safety device (8), described overcurrent and over-pressure safety device (8) arranged in series are between constant impedance low-loss connection transformer (1) and the ac bus of transformer station.
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| CN107248720B (en) * | 2017-08-16 | 2023-06-27 | 国网湖南省电力公司 | Intensive direct-current ice melting device with waste heat power generation function and control method thereof |
| CN107359579A (en) * | 2017-09-07 | 2017-11-17 | 国网湖南省电力公司 | Based on the complementary intensive DC de-icing device of SVG and diode rectifier |
| CN107359579B (en) * | 2017-09-07 | 2023-06-23 | 国网湖南省电力公司 | Intensive direct-current ice melting device based on SVG and diode rectifier complementation |
| CN109449852A (en) * | 2018-03-23 | 2019-03-08 | 国网浙江省电力公司丽水供电公司 | A kind of distribution line de-icing method of non-power loss mode |
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