CN111355204A - Modular high-frequency ice melting excitation power supply - Google Patents
Modular high-frequency ice melting excitation power supply Download PDFInfo
- Publication number
- CN111355204A CN111355204A CN201811578034.3A CN201811578034A CN111355204A CN 111355204 A CN111355204 A CN 111355204A CN 201811578034 A CN201811578034 A CN 201811578034A CN 111355204 A CN111355204 A CN 111355204A
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- Prior art keywords
- power
- ice melting
- power supply
- frequency
- phase
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a high-frequency high-voltage ice melting high-power excitation power supply, wherein the ice coating of a circuit can generate dielectric loss under the action of high frequency, and the ice coating of a power transmission line is melted under the combined action of the high-frequency high-voltage ice melting high-power excitation power supply and a high-frequency current skin effect. The device is formed by connecting power unit modules in parallel, the power unit module consists of two parts including a three-phase rectifying unit and a single-phase inverting unit, the input end of each module can be connected with a transformer substation for 6Kv power utilization, high-frequency current about 6Kv/5Khz is inverted after rectification, and the high-frequency current is connected with an icing power transmission line after being filtered by a damping filter after being connected in parallel.
Description
Technical Field
The invention relates to a power grid safety and ice melting disaster prevention technology, in particular to an excitation power supply used by a high-frequency high-voltage ice melting method.
Background
Ice disaster is one of the most serious threats to the power system, and when the serious ice disaster continuously attacks, the power transmission line is covered with ice, so that the loss of the power grid caused by the ice disaster is more serious than that caused by other accidents. In order to deal with the threat of more and more frequent ice disasters to the safe operation of an electric power system, various ice melting technologies are developed, and the main ice melting technologies comprise thermal ice melting, mechanical ice melting, passive ice melting and other ice melting methods. Among them, the thermal ice melting technology for converting electric energy into thermal energy needs to calculate the size and action time of ice melting current for the ice-covered wire, and has been widely used in the ice melting aspect of power grid transmission lines. Nowadays, the mature technology comprises alternating current short circuit ice melting and direct current short circuit ice melting, but the former is limited by the reactive capacity of an ice melting power supply and is suitable for being applied to a transmission line with a voltage level of 220kV or below or a short distance; the latter needs a DC ice melting power supply with high cost, the economy needs to be improved, and the ice melting is suitable for high-voltage long-distance transmission lines.
The high-frequency high-voltage excitation ice melting technology has the basic principle that: the coated ice can become a lossy dielectric medium in a medium-high frequency electric field, the high-frequency excitation source is applied to the coated ice conductor to generate joule heat with extremely strong skin effect and high-efficiency medium heat, and if the parameters of the high-frequency ice melting excitation source are reasonably selected, the joule heat and the medium heat are complementary along the line, so that the synthetic ice melting heat power with unchanged amplitude is obtained, and a good ice melting effect is achieved. The high-frequency high-voltage ice melting is low in ice melting current and high in ice melting efficiency, so that online ice melting is realized, attention is paid to the high-frequency high-voltage ice melting, and the high-frequency high-voltage ice melting can be performed only by a special high-frequency ice melting excitation power supply.
Disclosure of Invention
The invention provides a modularized high-frequency high-voltage ice melting excitation power supply. The high-frequency high-voltage ice melting technology has higher thermal efficiency due to the medium heat loss of ice and the skin effect of high-frequency current, and under the same ice melting condition, the ice melting current required by high-frequency high-voltage ice melting is smaller, the size of an ice melting power supply is smaller, and the economy is better. In addition, the defects of direct current short circuit ice melting and power frequency alternating current short circuit ice melting can be overcome, and online ice melting without power outage is realized.
The technical scheme adopted by the invention is as follows:
a modularized high-frequency high-voltage ice melting excitation power supply is characterized in that the input end of each power unit module is connected into a transformer substation in parallel for power utilization, high-frequency alternating current is generated through conversion of the power unit modules, and the output is connected into an icing power transmission line after being filtered by a passive damping filter.
The power unit module is characterized in that each module consists of a three-phase rectification circuit and a single-phase inversion unit, the three-phase rectification unit comprises a three-phase input filter inductor Lia，Lib，LicSix power diodes VD1，VD2，VD3，VD4，VD5，VD6And DC filter capacitor CdcPower diode VD1And VD4Form an A-phase bridge arm and a power diode VD3And VD6Form a B-phase bridge arm and a power diode VD5And VD2Forming a C-phase bridge arm; the single-phase inversion unit comprises four insulated gate bipolar transistors VT1，VT2，VT3，VT4Insulated gate bipolar transistor VT1，VT4Insulated gate bipolar transistor VT forming bridge arm 12，VT3Forming a bridge arm 2;
passive damped LC filter, characterized by an output filter inductance L of each power moduleiParallel connection, a capacitor C1And a capacitor C2The branch in series with the resistor R is connected in parallel.
The invention has the beneficial effects that:
1) the excitation power supply is composed of power unit modules, system redundancy is improved, the system work cannot be influenced by the fault of a single module, and the excitation power supply can be completed through the combination of the number of the modules according to the requirement of an actual ice-coated line on the power supply capacity.
2) The ice melting current is small, the ice melting efficiency is high, the economy is better, the defects of direct current short circuit ice melting and power frequency alternating current short circuit ice melting can be overcome, and the ice melting without power outage on line is realized.
The invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a diagram of an excitation power supply topology.
Fig. 2 is a circuit diagram of a power cell.
Detailed Description
The high-frequency high-voltage ice melting excitation power supply is explained in the following with the attached drawings.
A modularized high-frequency high-voltage ice melting excitation power supply is disclosed, as shown in figure 1, input ends of power unit modules are connected into a transformer substation in a parallel mode, high-frequency alternating current is generated through conversion of the power unit modules, and output is connected into an ice coating power transmission line after being filtered by a passive damping filter.
The power unit module is composed of a three-phase rectifying unit and a single-phase inverting unit as shown in FIG. 2, wherein the three-phase rectifying unit and the three-phase uncontrollable rectifying unit comprise three-phase input filter inductors Lia，Lib，LicSix power diodes VD1，VD2，VD3，VD4，VD5，VD6And DC filter capacitor Cdc(ii) a Because a large amount of higher harmonics are generated in the rectifying process, the harmonic waves injected into a power grid by the power unit are reduced by the filter inductor, the environment of the power grid is improved, and the false protection actions of overcurrent, overvoltage and the like of an excitation power supply caused by the harmonic waves in the power grid can be prevented. Power diode VD1And VD4Form an A-phase bridge arm and a power diode VD3And VD6Form a B-phase bridge arm and a power diode VD5And VD2Forming a C-phase bridge arm.
The single-phase inversion unit comprises four insulated gate bipolar transistors VT1，VT2，VT3，VT4Insulated gate bipolar transistor VT1，VT4Insulated gate bipolar transistor VT forming bridge arm 12，VT3The bridge arm 2 is formed, inverter driving signals are generated by adopting a carrier phase shift modulation technology, the equivalent switching frequency of the excitation power supply is improved, the switching loss is reduced, and the output harmonic of the excitation power supply is reduced.
Passive damped LC Filter, the output filter inductance L of each Power Module, as shown by the dashed Box in FIG. 1iHas the same inductance value, and a capacitor C1And a capacitor C2The branch in series with the resistor R is connected in parallel. The LC filter has a simple structure, can inhibit resonance peaks of the LC filter by a passive damping method, and has a good high-frequency attenuation effect. The harmonic wave in the high-frequency alternating current and the capacitor C can be filtered by designing parameters1Has a value of 2.3 × 10-7F, capacitance C2Has a value of 1.7 × 10-7F, the value of the resistor R is 15 omega, and the filter inductor LiHas a value of 4.335 × 10-3H。
The input end adopts three phases of A, B and C, 6Kv is rectified by a power unit module to obtain direct current of about 8Kv, and high-frequency alternating current of about 6Kv/5khz is generated by an inverter unit.
Claims (4)
1. A modularized high-frequency high-voltage ice melting excitation power supply is characterized in that input ends of power unit modules are connected into a substation power supply in a parallel mode, high-frequency alternating current is generated through conversion of the power unit modules, and output is connected into an icing power transmission line after being filtered by a passive damping filter.
2. The modular high-frequency high-voltage ice melting excitation power supply as claimed in claim 1, wherein: each power unit module consists of a three-phase rectification unit and a single-phase inversion unit, wherein the three-phase rectification unit comprises a three-phase input filter inductor Lia，Lib，LicSix power diodes VD1，VD2，VD3，VD4，VD5，VD6And DC filter capacitor CdcPower diode VD1And VD4Form an A-phase bridge arm and a power diode VD3And VD6Form a B-phase bridge arm and a power diode VD5And VD2Forming a C-phase bridge arm.
3. The modular high-frequency high-voltage ice melting excitation power supply as claimed in claim 1, wherein: the single-phase inversion unit comprises four insulated gate bipolar transistors VT1，VT2，VT3，VT4Insulated gate bipolar transistor VT1，VT4Insulated gate bipolar transistor VT forming bridge arm 12，VT3Constituting the bridge arm 2.
4. The modular high-frequency high-voltage ice melting excitation power supply as claimed in claim 1, wherein: passive damping LC filter, output filter inductor L of each power moduleiParallel connection, a capacitor C1And a capacitor C2The branch in series with the resistor R is connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578034.3A CN111355204A (en) | 2018-12-21 | 2018-12-21 | Modular high-frequency ice melting excitation power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578034.3A CN111355204A (en) | 2018-12-21 | 2018-12-21 | Modular high-frequency ice melting excitation power supply |
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| Publication Number | Publication Date |
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| CN111355204A true CN111355204A (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811578034.3A Pending CN111355204A (en) | 2018-12-21 | 2018-12-21 | Modular high-frequency ice melting excitation power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769748A (en) * | 2020-07-27 | 2020-10-13 | 长沙理工大学 | 5kHz high-frequency ice-melting power supply circuit of power distribution network |
| CN113507085A (en) * | 2021-07-14 | 2021-10-15 | 四川大学 | Three-phase passive anti-icing and de-icing resistor type control equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195261A (en) * | 2011-05-31 | 2011-09-21 | 长沙理工大学 | 18kV and 40kHz high-frequency de-icing device and de-icing method thereof |
| CN107395028A (en) * | 2017-07-26 | 2017-11-24 | 贵州电网有限责任公司电力科学研究院 | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device |
-
2018
- 2018-12-21 CN CN201811578034.3A patent/CN111355204A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195261A (en) * | 2011-05-31 | 2011-09-21 | 长沙理工大学 | 18kV and 40kHz high-frequency de-icing device and de-icing method thereof |
| CN107395028A (en) * | 2017-07-26 | 2017-11-24 | 贵州电网有限责任公司电力科学研究院 | The unit cascaded type high-power high-frequency high-voltage ice-melt excitation power supply circuit of full-controlled device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769748A (en) * | 2020-07-27 | 2020-10-13 | 长沙理工大学 | 5kHz high-frequency ice-melting power supply circuit of power distribution network |
| CN113507085A (en) * | 2021-07-14 | 2021-10-15 | 四川大学 | Three-phase passive anti-icing and de-icing resistor type control equipment |
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Application publication date: 20200630 |