CN114362084A - High-voltage line intelligent ice melting system and method based on full-controlled current type rectifier - Google Patents
High-voltage line intelligent ice melting system and method based on full-controlled current type rectifier Download PDFInfo
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Abstract
The invention discloses a high-voltage line intelligent ice melting system and a method based on a fully-controlled current type rectifier, wherein the high-voltage line intelligent ice melting system comprises: the device comprises an icing monitoring device (G), a full-control current type rectifier (E) and a phase change switching device (F), wherein the full-control current type rectifier (E) is externally connected with a first phase (A), a second phase (B) and a third phase (C) of three-phase power; and the positive terminal (DC +) and the negative terminal (DC-) of the full-current-controlled rectifier (E) are connected with the power transmission line (H) through the phase-change switching device (F). The intelligent ice melting system for the high-voltage line based on the fully-controlled current type rectifier can quickly detect the ice coating of the high-voltage line, the fully-controlled current type rectifier quickly starts ice melting, the phase-change switching device quickly switches the phase line for ice melting, and the ice melting efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of ice melting of high-voltage transmission lines, and particularly relates to an intelligent ice melting system and an intelligent ice melting method for a high-voltage line based on a fully-controlled current type rectifier.
Background
Along with natural disasters such as low temperature, rain and snow, freezing and the like in a large range, the high-voltage power transmission line freezes, so that large-range tower collapse is caused, and the serious challenge is brought to the safe power supply of a power system; therefore, the ice coating condition of the high-voltage transmission line is found quickly and timely, the transmission line is efficiently de-iced, and the power supply of the high-voltage transmission line is quickly recovered, so that the method has very important significance; in the prior art, aiming at the icing condition, manual observation or a camera is mainly used, and a special ice melting device is mainly used for melting ice which needs to be accessed independently; has the defects of low efficiency and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent ice melting system and an intelligent ice melting method for a high-voltage line based on a fully-controlled current type rectifier, so as to solve the problems of low efficiency and the like of ice melting of a high-voltage transmission line in the prior art.
The technical scheme of the invention is as follows:
a high-voltage line intelligent ice melting system based on a fully-controlled current type rectifier comprises: the system comprises an icing monitoring device, a full-control current type rectifier and a phase change switching device, wherein the full-control current type rectifier is externally connected with a first phase, a second phase and a third phase of three-phase power;
and the positive end and the negative end of the full-controlled current type rectifier are connected with the power transmission line through the phase change switching device.
The commutation switching device includes a first switching unit and a second switching unit.
The positive end of the full-control current type rectifier is connected with the power transmission line through the first switching unit, and the first switching unit is switched between a first phase and a second phase in the power transmission line;
and the negative end of the full-control current type rectifier is connected with the power transmission line through the second switching unit, and the second switching unit switches between a second phase and a third phase in the power transmission line.
The full-control current type rectifier comprises a first bridge arm valve group, a second bridge arm valve group, a third bridge arm valve group, a fourth bridge arm valve group, a fifth bridge arm valve group and a sixth bridge arm valve group,
each of the first bridge arm valve group to the sixth bridge arm valve group comprises a switch device and a diode connected in series with the switch device, the second pole of the diode is connected with the first pole of the switch device, the first pole of the diode is used as the first end of each bridge arm valve group, and the second pole of the switch device is used as the second end of each bridge arm valve group.
The full-control current type rectifier also comprises a direct current reactance L0，
The first end of the first bridge arm valve group is connected with the first end of the third bridge arm valve group, the first end of the fifth bridge arm valve group and the direct current reactance L0The first terminal of (1), the DC reactance L0The second end of the second resistor is used as the positive electrode end of the full-control current type rectifier;
the second end of the first bridge arm valve group is connected with the first end of the second bridge arm valve group, the second end of the third bridge arm valve group is connected with the first end of the fourth bridge arm valve group, and the second end of the fifth bridge arm valve group is connected with the first end of the sixth bridge arm valve group;
the second end of the second bridge arm valve group is connected with the second end of the fourth bridge arm valve group and the second end of the sixth bridge arm valve group and serves as the negative electrode end of the full-control current type rectifier;
the second end of the first bridge arm valve group is connected with and externally connected with the first phase, the second end of the third bridge arm valve group is externally connected with the second phase, and the second end of the fifth bridge arm valve group is externally connected with the third phase.
The full-control current type rectifier also comprises an A-phase first inductor, an A-phase second inductor, a B-phase first inductor, a B-phase second inductor, a C-phase first inductor and a C-phase second inductor,
the phase A first inductor and the phase A second inductor are connected in series, namely the second end of the phase A first inductor is connected with the first end of the phase A second inductor;
the phase B first inductor and the phase B second inductor are connected in series, namely the second end of the phase B first inductor is connected with the first end of the phase B second inductor;
the C-phase first inductor and the C-phase second inductor are connected in series, namely the second end of the C-phase first inductor is connected with the first end of the C-phase second inductor.
The first end of the A-phase first inductor is externally connected with the first phase, and the second end of the A-phase second inductor is connected with the second end of the first bridge arm valve bank;
the first end of the B-phase first inductor is externally connected with the second phase, and the second end of the B-phase second inductor is connected with the second end of the third bridge arm valve bank;
and the first end of the C-phase first inductor is externally connected with the third phase, and the second end of the C-phase second inductor is connected with the second end of the fifth bridge arm valve bank.
The second inductor of the phase A, the second inductor of the phase B and the second inductor of the phase C are omitted from the fully-controlled current mode rectifier,
at this time, the process of the present invention,
the second end of the phase A first inductor is connected with the second end of the first bridge arm valve group;
the second end of the B-phase first inductor is connected with the second end of the third bridge arm valve group;
and the second end of the C-phase first inductor is connected with the second end of the fifth bridge arm valve group.
The fully-controlled current mode rectifier also comprises a first capacitor, a second capacitor and a third capacitor,
the second end of the A-phase first inductor is connected with the first end of the first capacitor;
the second end of the B-phase first inductor is connected with the first end of the second capacitor;
the second end of the C-phase first inductor is connected with the first end of the third capacitor;
the second end of the first capacitor is connected with the second end of the second capacitor and the second end of the third capacitor.
The switch device is a current-type driven full-control device; the switching device is selected from at least one of the following devices: an integrated gate commutated thyristor, a turn-off thyristor and a power transistor,
when the switching device is a turn-off thyristor, the first pole of the switching device is an anode, and the second pole of the switching device is a cathode;
when the switching device is a power transistor, the first pole of the switching device is a collector, and the second pole of the switching device is an emitter.
The invention has the beneficial effects that:
the intelligent ice melting system for the high-voltage line based on the fully-controlled current type rectifier can quickly detect the ice coating of the high-voltage line, the fully-controlled current type rectifier quickly starts ice melting, the phase-change switching device quickly switches the phase line for ice melting, and the ice melting efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of a high-voltage line intelligent ice melting system based on a fully-controlled current mode rectifier according to an embodiment of the invention;
figure 2 shows a schematic structural diagram of a fully-controlled current mode rectifier adopted by the intelligent ice melting system for the high-voltage line according to the embodiment of the invention,
A. a first phase of the three-phase power; B. a second phase of the three-phase power; C. a third phase of the three-phase power; E. a fully controlled current mode rectifier; a positive terminal of a DC + full-controlled current mode rectifier; the negative end of the DC-full current control type rectifier; F. a switching device; f1, a first switching unit; f2, a second switching unit; G. an icing monitoring device; H. a transmission line; l isa1A phase A first inductor; l isa2A phase A second inductor; l isb1A B phase first inductor; l isb2A second inductor of phase B; l isc1A C-phase first inductor; l isc2A C-phase second inductor; caA first capacitor; cbA second capacitor; ccA third capacitor; h1, a first bridge arm valve group; h2 and a second bridge arm valve group;h3, third bridge arm valve set; h4 and a fourth bridge arm valve group; h5 and a fifth bridge arm valve group; h6 and a sixth bridge arm valve group; l is0A DC reactance;V dcthe direct current voltage output by the full-control current type rectifier; a1, a first phase in three-phase power of the power transmission line; b1, a second phase in the three-phase power of the power transmission line; c1, and a third phase in the three-phase power of the power transmission line.
Detailed Description
Fig. 1 is a schematic structural diagram of a high-voltage line intelligent ice melting system based on a fully-controlled current type rectifier provided by the invention. Referring to fig. 1, the intelligent ice melting system for the high-voltage line based on the fully-controlled current mode rectifier comprises an ice coating monitoring device G, a fully-controlled current mode rectifier E and a phase-change switching device F. Wherein, the full-controlled current type rectifier E is externally connected with a first phase A, a second phase B and a third phase C of three-phase power, and outputs direct-current voltage by a positive terminal DC + and a negative terminal DC-V dc. And the positive end DC + and the negative end DC-of the full-control current type rectifier E are connected with the power transmission line H through the phase change switching device F. The commutation switching device F includes a first switching unit F1 and a second switching unit F2. The positive terminal DC + of the fully-controlled current-mode rectifier E is connected to the power transmission line H through a first switching unit F1, and the first switching unit F1 is switchable between a first phase a1 and a second phase B1 in the power transmission line H. The negative terminal DC-of the fully controlled current mode rectifier E is connected to the transmission line H via a second switching unit F2, the second switching unit F2 being switchable between a second phase B1 and a third phase C1 in the transmission line H. The icing monitoring device G and the full-control current type rectifier E can be in two-way communication, the icing monitoring device G sends an icing signal to the full-control current type rectifier E, and the full-control current type rectifier E also sends the running state of the rectifier to the icing monitoring device G. Similarly, the fully-controlled current type rectifier E and the commutation switching device F can also perform bidirectional communication, the fully-controlled current type rectifier E sends a commutation operation instruction to the commutation switching device F, and the commutation switching device F sends state information of the commutation operation to the fully-controlled current type rectifier E.
Fig. 2 is a schematic structural diagram of a fully-controlled current type rectifier E adopted by the intelligent ice melting system for a high-voltage line provided by the invention. As can be seen from FIG. 2, the intelligent ice melting system for high-voltage lines of the invention adoptsThe fully-controlled current mode rectifier E comprises 6 bridge arm valve groups: each of the 6 bridge arm valve groups is composed of a switching device such as an Integrated Gate Commutated Thyristor (IGCT) and a diode connected in series with the switching device, wherein an anode of the diode is used as a first end of each bridge arm valve group, an anode of the diode is connected with an anode of the IGCT, and a cathode of the IGCT is used as a second end of each bridge arm valve group. The first end of the first bridge arm valve group H1 is connected with the first end of the third bridge arm valve group H3, the first end of the fifth bridge arm valve group H5 and the DC reactance L0A first terminal of (1), a DC reactance L0As the positive terminal DC + of the fully controlled current mode rectifier E. The second end of the first bridge arm valve group H1 is connected with the first end of the second bridge arm valve group H2, the second end of the third bridge arm valve group H3 is connected with the first end of the fourth bridge arm valve group H4, and the second end of the fifth bridge arm valve group H5 is connected with the first end of the sixth bridge arm valve group H2. A second end of second leg valve set H2 is connected to a second end of fourth leg valve set H4 and a second end of sixth leg valve set H2 and serves as the negative terminal DC-of fully-controlled current mode rectifier E. A phase first inductor La1And a phase second inductor La2Series, i.e. A-phase first inductance La1Is connected with the A-phase second inductor La2A first end of (a); a phase first inductor La1The first end of the first inductor is externally connected with a first phase A and a second phase A of the three-phase powera2Is connected to a second end of first leg valve set H1. B-phase first inductor Lb1And a B-phase second inductor Lb2Series, i.e. B-phase first inductance Lb1Second end of the first inductor is connected with a second inductor L of the B phaseb2A first end of (a); b-phase first inductor Lb1The first end of the first inductor is externally connected with a second phase B and a second phase B of the three-phase powerb2Is connected to a second end of a third bridge arm valve set H3. C-phase first inductor Lc1And a C-phase second inductor Lc2Series, i.e. C-phase, first inductance Lc1Is connected with a C-phase second inductor Lc2A first end of (a); c-phase first inductor Lc1The first end of the first inductor is externally connected with a third phase C, C phase second inductor L in the three-phase powerc2Is connected to a second end of a fifth leg valve set H5. A phase first inductor La1Second of (2)End connected with a first capacitor CaA first end of (a); b-phase first inductor Lb1Second terminal of the first capacitor is connected with a second capacitor CbA first end of (a); c-phase first inductor Lc1Is connected with a third capacitor CcA first terminal of (C), a first capacitor CaSecond terminal of the first capacitor is connected with a second capacitor CbSecond terminal and third capacitor CcThe second end of (a).
Wherein, the A phase first inductor La1And a first capacitor CaForming a first LC filter, a first inductance L of phase Bb1And a second capacitor CbForming a second LC filter, a C-phase first inductor Lc1And a third capacitance CcConstituting a third LC filter. A phase second inductor La2Second inductance L of B phaseb2And a C-phase second inductor Lc2Are both anodic reactances which limit the IGCT on-current and are possibly replaced by stray reactances. The three anode reactances described above may also be omitted. Instead of the IGCT described above, the switching device may be a fully controlled device driven by other current sources, such as a turn-off thyristor (GTO) or a power transistor (GTR). When the switching device employs a GTO, the first pole of the switching device is an anode and the second pole is a cathode. When the switching device employs GTR, the first pole of the switching device is the collector and the second pole is the emitter.
In the fully-controlled current type rectifier E, the 6 bridge arm valve groups from the first bridge arm valve group H1 to the sixth bridge arm valve group H6 can adopt pulse modulation methods such as characteristic harmonic elimination pulse modulation or space vector modulation to eliminate low-order harmonic, adopt PQ decoupling control to realize unit power factor, and have the advantages of low current distortion rate and high power factor.
In the high-voltage line intelligent ice melting system based on the fully-controlled current type rectifier E, the ice coating monitoring device G is used for collecting signals of ambient temperature, humidity, tension of a high-voltage transmission line, an inclination angle of a line, an inclination angle of an insulator and the like, and images of a video sensor are matched to comprehensively judge the ice coating condition of the high-voltage transmission line.
The full-control current type rectifier E outputs continuously adjustable direct current and has the advantages of high starting speed, small impact, continuously adjustable current, high alternating-current side electric energy quality and high power factor.
The phase change switching device F switches the positive end DC + of the connected full-control current type rectifier between the phase A and the phase B, and switches the negative end DC-of the full-control current type rectifier between the phase B and the phase C, so that different ice melting schemes can be realized, and the connecting wire does not need to be disconnected again, and the phase change switching device has the advantages of automatic identification, automatic switching and short switching time.
The ice melting method of the high-voltage line intelligent ice melting system based on the fully-controlled current type rectifier E provided by the invention comprises the following steps,
when the icing monitoring device G monitors that the line is iced:
firstly, stopping running an ice-coated line, disconnecting a disconnecting link of the line and short-circuiting the tail end of the ice-coated line;
secondly, controlling a phase change switching device F to select the phase of ice melting according to the ice melting scheme;
thirdly, starting a full-control current type rectifier E to melt ice;
fourthly, monitoring that the ice melting phase is melted by the ice coating monitor G;
and fifthly, stopping the operation and fully controlling the current type rectifier E.
Sixthly, controlling the phase change switching device F to select other phases;
seventhly, starting a full-control current type rectifier E to melt ice;
eighthly, monitoring that all phases are melted by an ice coating monitoring device G;
and ninthly, stopping the operation and fully controlling the current type rectifier E.
The intelligent ice melting system for the high-voltage line based on the fully-controlled current type rectifier can quickly detect the ice coating of the high-voltage line, the fully-controlled current type rectifier quickly starts ice melting, the phase-change switching device quickly switches the phase line for ice melting, and the ice melting efficiency is improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-voltage line intelligent ice melting system based on a fully-controlled current type rectifier comprises:
icing monitoring device (G), full-controlled current type rectifier (E) and commutation switching device (F)
The fully-controlled current type rectifier (E) is externally connected with a first phase (A), a second phase (B) and a third phase (C) of three-phase power;
and the positive terminal (DC +) and the negative terminal (DC-) of the full-current-controlled rectifier (E) are connected with the power transmission line (H) through the phase-change switching device (F).
2. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 1,
the commutation switching device (F) includes a first switching unit (F1) and a second switching unit (F2).
3. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 2,
the positive electrode terminal (DC +) of the fully-controlled current type rectifier (E) is connected with the power transmission line (H) through the first switching unit (F1), and the first switching unit (F1) is switched between a first phase (A1) and a second phase (B1) in the power transmission line (H);
the negative end (DC-) of the fully-controlled current-type rectifier (E) is connected with the power transmission line (H) through the second switching unit (F2), and the second switching unit (F2) is switched between a second phase (B1) and a third phase (C1) in the power transmission line (H).
4. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 3,
the full-control current type rectifier (E) comprises a first bridge arm valve bank (H1), a second bridge arm valve bank (H2), a third bridge arm valve bank (H3), a fourth bridge arm valve bank (H4), a fifth bridge arm valve bank (H5) and a sixth bridge arm valve bank (H6),
each of the first bridge arm valve group (H1) to the sixth bridge arm valve group (H6) includes a switch device and a diode connected in series with the switch device, a second pole of the diode is connected to a first pole of the switch device, the first pole of the diode is used as a first end of each bridge arm valve group, and the second pole of the switch device is used as a second end of each bridge arm valve group.
5. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 4,
the fully-controlled current mode rectifier (E) further comprises a direct current reactance (L)0），
The first end of the first bridge arm valve group (H1) is connected with the first end of the third bridge arm valve group (H3), the first end of the fifth bridge arm valve group (H5) and the direct current reactance (L)0) The first terminal of (1), the direct current reactance (L)0) As the positive terminal (DC +) of said fully controlled current mode rectifier (E);
a second end of the first bridge arm valve group (H1) is connected with a first end of the second bridge arm valve group (H2), a second end of the third bridge arm valve group (H3) is connected with a first end of the fourth bridge arm valve group (H4), and a second end of the fifth bridge arm valve group (H5) is connected with a first end of the sixth bridge arm valve group (H6);
the second end of the second bridge arm valve group (H2) is connected with the second end of the fourth bridge arm valve group (H4) and the second end of the sixth bridge arm valve group (H2) and is used as the negative electrode end (DC-) of the full-control current type rectifier (E);
the second end of the first bridge arm valve group (H1) is connected and externally connected with the first phase (A), the second end of the third bridge arm valve group (H3) is externally connected with the second phase (B), and the second end of the fifth bridge arm valve group (H5) is externally connected with the third phase (C).
6. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 5,
the fully-controlled current mode rectifier (E) further comprises an A-phase first inductor (L)a1) A second inductor (L) of phase Aa2) A first inductor (L) of phase Bb1) A second inductance (L) of phase Bb2) A first inductor (L) of phase Cc1) And a C-phase second inductor (L)c2），
The A-phase first inductor (L)a1) And a phase second inductance (L)a2) In series, i.e. the A-phase first inductance (L)a1) Is connected to the a-phase second inductor (L)a2) A first end of (a);
the B-phase first inductor (L)b1) And a B-phase second inductor (L)b2) In series, i.e. the B-phase first inductance (L)b1) Is connected to the B-phase second inductor (L)b2) A first end of (a);
the C-phase first inductance (L)c1) And a C-phase second inductor (L)c2) In series, i.e. the C-phase first inductance (L)c1) Is connected to the C-phase second inductance (L)c2) The first end of (a).
7. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 6,
the A-phase first inductor (L)a1) Is connected with the first phase (A) externally, and the A phase second inductor (L)a2) Is connected to a second end of said first leg valve set (H1);
the B-phase first inductor (L)b1) Is connected with the second phase (B) externally, and the second inductance (L) of the B phaseb2) Is connected to a second end of the third bridge arm valve set (H3);
the C-phase first inductance (L)c1) Is connected externally to the third phase (C), the C phase is connected externally to the second phaseTwo inductors (L)c2) Is connected to a second end of said fifth leg valve set (H5).
8. The intelligent ice melting system for high-voltage lines based on fully-controlled current-mode rectifier according to claim 7,
omitting the A-phase second inductor (L) in the fully-controlled current-mode rectifier (E)a2) A second inductance (L) of phase Bb2) And a C-phase second inductor (L)c2），
At this time, the process of the present invention,
the A-phase first inductor (L)a1) Is connected to a second end of said first leg valve set (H1);
the B-phase first inductor (L)b1) Is connected to a second end of the third bridge arm valve set (H3);
the C-phase first inductance (L)c1) Is connected to a second end of said fifth leg valve set (H5).
9. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in claim 7 or 8,
the fully-controlled current mode rectifier (E) further comprises a first capacitor (C)a) A second capacitor (C)b) A third capacitor (C)c），
The A-phase first inductor (L)a1) Is connected to said first capacitor (C)a) A first end of (a);
the B-phase first inductor (L)b1) Is connected to said second capacitor (C)b) A first end of (a);
the C-phase first inductance (L)c1) Is connected to said third capacitance (C)c) A first end of (a);
the first capacitor (C)a) Is connected to said second capacitor (C)b) And said third capacitance (C)c) The second end of (a).
10. The intelligent ice melting system for high-voltage lines based on fully-controlled current mode rectifier as claimed in any one of claims 4-8,
the switch device is a current-type driven full-control device; the switching device is selected from at least one of the following devices: an integrated gate commutated thyristor, a turn-off thyristor and a power transistor,
when the switching device is a turn-off thyristor, the first pole of the switching device is an anode, and the second pole of the switching device is a cathode;
when the switching device is a power transistor, the first pole of the switching device is a collector, and the second pole of the switching device is an emitter.
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