CN110729748A - Fundamental frequency switch type high power factor high voltage DC transmission current converter - Google Patents

Fundamental frequency switch type high power factor high voltage DC transmission current converter Download PDF

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CN110729748A
CN110729748A CN201911008800.7A CN201911008800A CN110729748A CN 110729748 A CN110729748 A CN 110729748A CN 201911008800 A CN201911008800 A CN 201911008800A CN 110729748 A CN110729748 A CN 110729748A
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point
time
turn
current
reverse
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李子欣
徐飞
赵聪
高范强
王平
李耀华
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • H02M7/1623—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
    • H02M7/1626—Conversion of ac power input into dc 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
    • 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
    • H02M7/505—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 thyratron or thyristor type requiring extinguishing means
    • H02M7/515—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/521—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A fundamental frequency switch type high power factor high voltage DC transmission converter comprises reverse resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26, a first DC filter inductor Ldc1And a second DC filter inductor Ldc2And (4) forming. The current i flowing through the first direct current filter inductor is controlled by adjusting the switching time and the conducting time of the reverse resistance type turn-off devices S11, S12, S13, S14, S15 and S16dc1The current i flowing through the second DC filter inductor is controlled by adjusting the switching time and the conducting time of the reverse-resistance type turn-off devices S21, S22, S23, S24, S25 and S26dc2. The three-phase alternating-current side current of the fundamental frequency switch type high-power factor high-voltage direct-current transmission converter and the three-phase voltage of a connected three-phase alternating-current power supply are in the same phase. In thatThe method avoids the problem that the existing thyristor-based power grid commutation converter does not adopt extra reactive compensation equipment to realize the unit power factor operation of the converter under the condition of commutation failure, and has better reliability and economy.

Description

Fundamental frequency switch type high power factor high voltage DC transmission current converter
Technical Field
The invention relates to a fundamental frequency switch type high-power factor high-voltage direct-current transmission converter.
Background
The existing High Voltage Direct Current (HVDC) Converter mainly includes two main types, namely a thyristor-based grid Commutated Converter (LCC) and a Voltage-Source Converter (VSC) -based flexible dc Converter.
However, the thyristor in the LCC-HVDC is a passive commutation device, the turn-off of which is determined by an external circuit, and the controllable quantity is only the firing angle, so that the LCC-HVDC system has the risk of commutation failure, and the harmonic wave and the reactive current are large. The invention patent CN201310430659 proposes an improved circuit capable of reducing the risk of commutation failure, but cannot completely solve the commutation failure problem of LCC-HVDC. However, the dc side of the VSC-HVDC converter generally needs a dc capacitor, for example, patent CN201080066222, and when a dc short circuit occurs, such a converter is difficult to perform fault ride-through operation.
In addition, although a Modular Multilevel Converter (MMC) based on a full-bridge sub-module can realize direct-current side fault ride-through of the HVDC system, compared with a traditional circuit topology based on a half-bridge sub-module, the full-bridge MMC has huge numbers of power semiconductors and sub-module capacitors, so that the cost of the converter is high, the loss is remarkably increased, and the popularization and application of the converter are limited.
Disclosure of Invention
The invention aims to overcome the defects of the existing HVDC converter technology and provides a base frequency switch type high-power-factor high-voltage direct-current transmission converter with active phase change.
The invention relates to a fundamental frequency switch type high power factor high-voltage direct current transmission converter, which comprises reverse resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22,S23, S24, S25, S26 and first direct current filter inductor Ldc1And a second DC filter inductor Ldc2And (4) forming. The anode of the reverse blocking type turn-off device S11 is connected to the point P1, and the cathode of S11 is connected to the point a 1; the anode of the reverse blocking type turn-off capable device S14 is connected to the point a1, and the cathode of S14 is connected to the point N; the anode of the reverse blocking type turn-off device S13 is connected to the point P1, and the cathode of S13 is connected to the point B1; the anode of the reverse blocking type turn-off device S16 is connected to the point B1, and the cathode of S16 is connected to the point N; the anode of the reverse blocking type turn-off device S15 is connected to the point P1, and the cathode of S15 is connected to the point C1; the anode of the reverse blocking type turn-off device S12 is connected to the point C1, and the cathode of S12 is connected to the point N; the anode of the reverse blocking type turn-off device S21 is connected to the point P2, and the cathode of S21 is connected to the point a 2; the anode of the reverse blocking type turn-off capable device S24 is connected to the point a2, and the cathode of S24 is connected to the point N; the anode of the reverse blocking type turn-off device S23 is connected to the point P2, and the cathode of S23 is connected to the point B2; the anode of the reverse blocking type turn-off device S26 is connected to the point B2, and the cathode of S26 is connected to the point N; the anode of the reverse blocking type turn-off device S25 is connected to the point P2, and the cathode of S25 is connected to the point C2; the anode of the reverse blocking type turn-off capable device S22 is connected to the point C2, and the cathode of S22 is connected to the point N. First direct current filter inductor Ldc1Is connected to point P, a first DC filter inductor Ldc1The other end of the first arm is connected to a point P1; second direct current filter inductor Ldc2One end of the second DC filter inductor L is connected to the P pointdc2The other end of which is connected to point P2. The points A1 and A2 are connected to the point A, the points B1 and B2 are connected to the point B, and the points C1 and C2 are connected to the point C. And the point P is used as a high-voltage direct-current output positive connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter, and the point N is used as a high-voltage direct-current output negative connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter. And the point A, the point B and the point C are respectively used as an alternating-current side three-phase connecting terminal of the fundamental frequency switch type high-power factor high-voltage direct-current transmission converter. The current flowing from point A1 to point A is ia1The current flowing from point B1 to point B is ib1The current flowing from point C1 to point C is ic1The current flowing from point A2 to point A is ia2The current flowing from point B2 to point B is ib2Point C2 flowCurrent to point C is ic2. The current flowing out of the fundamental frequency switch type high power factor high voltage direct current transmission converter from the point A is iagThe current flowing from point B is ibgThe current flowing from point C is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2. From point P through a first DC filter inductor Ldc1The current flowing to point P1 is idc1From point P via a second DC filter inductor Ldc2The current flowing to point P2 is idc2. The current flowing from the point P to the fundamental frequency switch type high power factor high voltage direct current transmission converter is idc. The three-phase alternating current power supply voltages connected with the three-phase connecting terminal A, B, C on the alternating current side of the fundamental frequency switch type high power factor high-voltage direct current transmission converter are respectively usa、usbAnd uscAnd u issa、usbAnd uscA sine wave of equal voltage amplitude and frequency F, usaInitial phase angle lead usbInitial phase angle of 120 deg., usbInitial phase angle lead uscThe initial phase angle of (d) is 120.
The invention adjusts the switching time and the conducting time of the reverse resistance type turn-off devices S11, S12, S13, S14, S15 and S16 to carry out current i flowing through the first direct current filter inductordc1Controlling the current i flowing through the second DC filter inductor by adjusting the switching time and the conducting time of the reverse resistance type turn-off devices S21, S22, S23, S24, S25 and S26dc2And (5) controlling. The current i flowing through the first DC filter inductordc1And a current i flowing through the second DC filter inductordc2Are equal and are all idc1/2 of (1). In 1/F of each period, u of the three-phase alternating current power supply connected with the three-phase connection terminal A, B, C on the alternating current side of the fundamental frequency switch type high-power-factor high-voltage direct current transmission convertersaAnd uscAre all positive and usa＝uscIs defined as T0。
The switching time and the on-time of the reverse blocking type turn-off devices S11, S12, S13, S14, S15 and S16 are determined as follows:
the switching frequencies of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15 and S16 are all F, the on time in each period of 1/F is 1/F/3, and the off time in each period of 1/F is 2/F/3; defining a first adjustment time TR1，TR1Is a positive number, and 0 is more than or equal to TR1Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TR1The turn-off time is T0-TR1+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR1+1/F/6, turn-off time T0-TR1+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR1+1/F/3, turn-off time T0-TR1+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR1+1/F/2, turn-off time T0-TR1+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S15 is T0-TR1+2/F/3, turn-off time T0-TR1+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR1+5/F/6, turn-off time T0-TR1+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
The switching time and the on-time of the reverse blocking type turn-off devices S21, S22, S23, S24, S25 and S26 are determined as follows:
the switching frequencies of the reverse-resistance type turn-off devices S21, S22, S23, S24, S25 and S26 are all F, the on time in each period of 1/F is 1/F/3, and the off time in each period of 1/F is 2/F/3; defining a second adjustment time TR2，TR2Is a positive number, and 0 is more than or equal to TR2Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S21 is T0+TR2The turn-off time is T0+TR2+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR2+1/F/6, turn-off time T0+TR2+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR2+1/F/3, turn-off time T0+TR2+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR2+1/F/2, turn-off time T0+TR2+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR2+2/F/3, turn-off time T0+TR2+ 1/F; the turn-on time of the reverse-resistance type turn-off device S26 is T0+TR2+5/F/6, turn-off time T0+TR2+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
When the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the first direct current filter inductor is positivedc1Is less than idc1At the reference value of (1), then the first adjustment time T is reducedR1Otherwise, increasing the first adjustment time TR1(ii) a When the average voltage value between the direct current side connecting terminals P1 and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is negative, if the current i of the first direct current filter inductor is negativedc1Is less than idc1Is then increased by the first adjustment time TR1Otherwise, the first adjustment time T is reducedR1(ii) a When the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the second direct current filter inductor is positivedc2Is less than idc2When the reference value is greater than the first reference value, the second adjustment time T is decreasedR2Otherwise, the second adjustment time T is increasedR2(ii) a When the direct current side connecting end of the fundamental frequency switch type high power factor high voltage direct current transmission converterIf the average voltage value between sub-P2 and N is negative, the current i of the second DC filter inductordc2Is less than idc2At the reference value, the second adjustment time T is increasedR2Otherwise, the second adjustment time T is reducedR2。
First direct current filter inductor Ldc1And a second dc filter inductor Ldc2Is equal to the inductance value of (1), the first regulation time T in the steady stateR1And a second adjustment time TR2Equal, alternating current ia1，ib1，ic1The fundamental wave components of (1) are all ahead of respective alternating three-phase voltage usa，usb，usc(ii) a Alternating current ia2，ib2，ic2The fundamental wave components of (1) are all lagged by respective AC three-phase voltages usa，usb，usc(ii) a Alternating current iag，ibg，icgThe fundamental wave components of (a) are all connected with respective alternating three-phase voltages usa，usb，uscThe phases are the same.
Drawings
FIG. 1 is a schematic diagram of a fundamental frequency switching type high power factor HVDC converter circuit of the present invention;
fig. 2 is a simulation waveform diagram of a phase voltage and a current at a three-phase alternating current side when the fundamental frequency switching type high power factor high-voltage direct current transmission converter adopts the control method.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic diagram of a fundamental frequency switching type high power factor high voltage direct current transmission converter circuit of the invention. The invention relates to a fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter, which comprises reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26, a first direct-current filter inductor Ldc1And a second DC filter inductor Ldc2And (4) forming. The anode of the reverse blocking type turn-off device S11 is connected to the point P1, and the cathode of S11 is connected to the point a 1; the anode of the reverse blocking type turn-off capable device S14 is connected to the point a1, and the cathode of S14 is connected to the point N; reverse resistance type closableThe anode of the cut-off device S13 is connected to the point P1, and the cathode of S13 is connected to the point B1; the anode of the reverse blocking type turn-off device S16 is connected to the point B1, and the cathode of S16 is connected to the point N; the anode of the reverse blocking type turn-off device S15 is connected to the point P1, and the cathode of S15 is connected to the point C1; the anode of the reverse blocking type turn-off device S12 is connected to the point C1, and the cathode of S12 is connected to the point N; the anode of the reverse blocking type turn-off device S21 is connected to the point P2, and the cathode of S21 is connected to the point a 2; the anode of the reverse blocking type turn-off capable device S24 is connected to the point a2, and the cathode of S24 is connected to the point N; the anode of the reverse blocking type turn-off device S23 is connected to the point P2, and the cathode of S23 is connected to the point B2; the anode of the reverse blocking type turn-off device S26 is connected to the point B2, and the cathode of S26 is connected to the point N; the anode of the reverse blocking type turn-off device S25 is connected to the point P2, and the cathode of S25 is connected to the point C2; the anode of the reverse blocking type turn-off capable device S22 is connected to the point C2, and the cathode of S22 is connected to the point N. First direct current filter inductor Ldc1Is connected to point P, a first DC filter inductor Ldc1The other end of the first arm is connected to a point P1; second direct current filter inductor Ldc2One end of which is connected to the point P,
second direct current filter inductor Ldc2The other end of which is connected to point P2. The points A1 and A2 are connected to the point A, the points B1 and B2 are connected to the point B, and the points C1 and C2 are connected to the point C. And the point P is used as a high-voltage direct-current output positive connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter, and the point N is used as a high-voltage direct-current output negative connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter. And the point A, the point B and the point C are respectively used as an alternating-current side three-phase connecting terminal of the fundamental frequency switch type high-power factor high-voltage direct-current transmission converter. The current flowing from point A1 to point A is ia1The current flowing from point B1 to point B is ib1The current flowing from point C1 to point C is ic1The current flowing from point A2 to point A is ia2The current flowing from point B2 to point B is ib2The current flowing from point C2 to point C is ic2. The current flowing out of the fundamental frequency switch type high power factor high voltage direct current transmission converter from the point A is iagThe current flowing from point B is ibgThe current flowing from point C is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2. From point P through a first DC filter inductor Ldc1The current flowing to point P1 is idc1From point P via a second DC filter inductor Ldc2The current flowing to point P2 is idc2. The current flowing from the point P to the fundamental frequency switch type high power factor high voltage direct current transmission converter is idc. The three-phase alternating current power supply voltages connected with the three-phase connecting terminal A, B, C on the alternating current side of the fundamental frequency switch type high power factor high-voltage direct current transmission converter are respectively usa、usbAnd uscAnd u issa、usbAnd uscA sine wave of equal voltage amplitude and frequency F, usaInitial phase angle lead usbInitial phase angle of 120 deg., usbInitial phase angle lead uscThe initial phase angle of (d) is 120.
The current i flowing through the DC filter inductor is subjected to on-off control by adjusting the switching time and the on-off time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15 and S16dc1Controlling the current i flowing through the second DC filter inductor by adjusting the switching time and the conducting time of the reverse resistance type turn-off devices S21, S22, S23, S24, S25 and S26dc2And (5) controlling. From point P through a first DC filter inductor Ldc1Current i flowing to point P1dc1And from point P through a second DC filter inductor Ldc2Current i flowing to point P2dc2Are equal and are all idc1/2 of (1). In 1/F of each period, u is in three-phase alternating current power supply voltage connected with a three-phase connection terminal A, B, C on the alternating current side of the fundamental frequency switch type high-power-factor high-voltage direct current transmission convertersaAnd uscAre all positive and usa＝uscIs defined as T0。
The switching time and the on-time of the reverse blocking type turn-off devices S11, S12, S13, S14, S15 and S16 are determined as follows:
the switching frequencies of the reverse blocking type turn-off devices S11, S12, S13, S14, S15 and S16 are all F, and 1 ^ is greater than or equal toThe on-time in the F is 1/F/3, and the off-time in each period of 1/F is 2/F/3; defining a first adjustment time TR1，TR1Is a positive number, and 0 is more than or equal to TR1Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TR1The turn-off time is T0-TR1+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR1+1/F/6, turn-off time T0-TR1+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR1+1/F/3, turn-off time T0-TR1+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR1+1/F/2, turn-off time T0-TR1+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S15 is T0-TR1+2/F/3, turn-off time T0-TR1+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR1+5/F/6, turn-off time T0-TR1+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
The switching time and the on-time of the reverse blocking type turn-off devices S21, S22, S23, S24, S25 and S26 are determined as follows: the switching frequencies of S21, S22, S23, S24, S25 and S26 are all F, the on-time in each period 1/F is 1/F/3, and the off-time in each period 1/F is 2/F/3; defining a second adjustment time TR2，TR2Is a positive number, and 0 is more than or equal to TR2Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S21 is T0+TR2The turn-off time is T0+TR2+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR2+1/F/6, turn-off time T0+TR2+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR2+1/F/3, at turn-offIs carved as T0+TR2+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR2+1/F/2, turn-off time T0+TR2+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR2+2/F/3, turn-off time T0+TR2+ 1/F; the turn-on time of the reverse-resistance type turn-off device S26 is T0+TR2+5/F/6, turn-off time T0+TR2+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
When the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the first direct current filter inductor is positivedc1Is less than idc1At the reference value of (1), then the first adjustment time T is reducedR1Otherwise, increasing the first adjustment time TR1(ii) a When the average voltage value between the direct current side connecting terminals P1 and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is negative, if the current i of the first direct current filter inductor is negativedc1Is less than idc1Is then increased by the first adjustment time TR1Otherwise, the first adjustment time T is reducedR1(ii) a When the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the second direct current filter inductor is positivedc2Is less than idc2When the reference value is greater than the first reference value, the second adjustment time T is decreasedR2Otherwise, the second adjustment time T is increasedR2(ii) a When the average voltage value between the direct current side connecting terminals P2 and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is negative, if the current i of the second direct current filter inductor is negativedc2Is less than idc2At the reference value of (a), the second adjustment time T is increasedR2Otherwise, the second adjustment time T is reducedR2。
First direct current filter inductor Ldc1And a second dc filter inductor Ldc2Is equal to the inductance value of (1), the first regulation time T in the steady stateR1And a second adjustment time TR2Equal, alternating current ia1，ib1，ic1The fundamental wave components of (1) are all ahead of respective alternating three-phase voltage usa，usb，usc(ii) a Alternating current ia2，ib2，ic2The fundamental wave components of (1) are all lagged by respective AC three-phase voltages usa，usb，usc(ii) a Alternating current iag，ibg，icgThe fundamental wave components of (a) are all connected with respective alternating three-phase voltages usa，usb，uscThe phases are the same.
Fig. 2 is a simulation waveform diagram of a phase voltage and a current at a three-phase alternating current side when the fundamental frequency switching type high power factor high-voltage direct current transmission converter adopts the control method. In simulation, the effective value of the voltage of a three-phase AC power line is 1000V, the frequency is 50Hz, and the direct current idc1000A, flows through a first dc filter inductor Ldc1Current i ofdc1And through a second DC filter inductor Ldc2Current i ofdc2Are all set to 500A, the first adjusting time TR1And a second adjustment time TR2Are all set to 1 ms. As can be seen from the simulation results, ia1Fundamental wave component lead usa，ia2Lag u of fundamental componentsa，iagFundamental component and usaThe phases are almost the same. That is, the fundamental power factor is almost 1 for a three-phase ac power supply. The fundamental frequency switch type high power factor high voltage direct current transmission converter realizes high power factor operation without additional reactive compensation equipment when adopting the control method. Meanwhile, all the reverse-resistance type turn-off devices in the invention can be actively turned off, so that the problem of commutation failure in a thyristor-based power grid commutation converter can be avoided, and the thyristor-based power grid commutation converter has better safety and economy.

Claims (6)

1. A fundamental frequency switch type high power factor high voltage DC transmission current converterCharacterized in that: the fundamental frequency switch type high power factor high voltage direct current transmission converter comprises reverse resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S26, a first direct current filter inductor Ldc1And a second DC filter inductor Ldc2Composition is carried out; the anode of the reverse blocking type turn-off device S11 is connected to the point P1, and the cathode of S11 is connected to the point a 1; the anode of the reverse blocking type turn-off capable device S14 is connected to the point a1, and the cathode of S14 is connected to the point N; the anode of the reverse blocking type turn-off device S13 is connected to the point P1, and the cathode of S13 is connected to the point B1; the anode of the reverse blocking type turn-off device S16 is connected to the point B1, and the cathode of S16 is connected to the point N; the anode of the reverse blocking type turn-off device S15 is connected to the point P1, and the cathode of S15 is connected to the point C1; the anode of the reverse blocking type turn-off device S12 is connected to the point C1, and the cathode of S12 is connected to the point N; the anode of the reverse blocking type turn-off device S21 is connected to the point P2, and the cathode of S21 is connected to the point a 2; the anode of the reverse blocking type turn-off capable device S24 is connected to the point a2, and the cathode of S24 is connected to the point N; the anode of the reverse blocking type turn-off device S23 is connected to the point P2, and the cathode of S23 is connected to the point B2; the anode of the reverse blocking type turn-off device S26 is connected to the point B2, and the cathode of S26 is connected to the point N; the anode of the reverse blocking type turn-off device S25 is connected to the point P2, and the cathode of S25 is connected to the point C2; the anode of the reverse blocking type turn-off device S22 is connected to the point C2, and the cathode of S22 is connected to the point N; first direct current filter inductor Ldc1Is connected to point P, a first DC filter inductor Ldc1The other end of the first arm is connected to a point P1; second direct current filter inductor Ldc2One end of the second DC filter inductor L is connected to the P pointdc2The other end of the first arm is connected to a point P2; the point A1 and the point A2 are connected to the point A, the point B1 and the point B2 are connected to the point B, and the point C1 and the point C2 are connected to the point C; the P point is used as a high-voltage direct-current output positive connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter, and the N point is used as a high-voltage direct-current output negative connecting terminal of the fundamental frequency switch type high-power-factor high-voltage direct-current transmission converter; the point A, the point B and the point C are respectively used as an alternating-current side three-phase connecting terminal of the fundamental frequency switch type high-power factor high-voltage direct-current transmission converter; the current flowing from point A1 to point A is ia1The current flowing from point B1 to point B is ib1The current flowing from point C1 to point C is ic1The current flowing from point A2 to point A is ia2The current flowing from point B2 to point B is ib2The current flowing from point C2 to point C is ic2(ii) a The current flowing out of the fundamental frequency switch type high power factor high voltage direct current transmission converter from the point A is iagThe current flowing from point B is ibgThe current flowing from point C is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2(ii) a From point P through a first DC filter inductor Ldc1The current flowing to point P1 is idc1From point P via a second DC filter inductor Ldc2The current flowing to point P2 is idc2(ii) a The current flowing from the point P to the fundamental frequency switch type high power factor high voltage direct current transmission converter is idc(ii) a The three-phase alternating current power supply voltages connected with the three-phase connecting terminal A, B, C on the alternating current side of the fundamental frequency switch type high power factor high-voltage direct current transmission converter are respectively usa、usbAnd uscAnd u issa、usbAnd uscA sine wave of equal voltage amplitude and frequency F, usaInitial phase angle lead usbInitial phase angle of 120 deg., usbInitial phase angle lead uscThe initial phase angle of (d) is 120.
2. The fundamental frequency switched high power factor hvdc transmission converter in accordance with claim 1 further comprising: the current i flowing through the DC filter inductor is subjected to on-off control by adjusting the switching time and the on-off time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15 and S16dc1Controlling the current i flowing through the second DC filter inductor by adjusting the switching time and the conducting time of the reverse resistance type turn-off devices S21, S22, S23, S24, S25 and S26dc2Controlling; the current i flowing through the first DC filter inductordc1And a current i flowing through the second DC filter inductordc2Are equal and are all idc1/2 of (1); within 1/F of each period, the fundamental frequency switch type high power factor high voltage DC converterThree-phase ac power supply voltage u connected to three-phase connection terminal A, B, C on ac side of current-to-current power convertersaAnd uscAre all positive and usa＝uscIs defined as T0。
3. The fundamental frequency switched high power factor hvdc transmission converter in accordance with claim 2 further comprising: the switching time and the on-time of the reverse blocking type turn-off devices S11, S12, S13, S14, S15 and S16 are determined as follows:
the switching frequencies of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15 and S16 are all F, the on time in each period of 1/F is 1/F/3, and the off time in each period of 1/F is 2/F/3; defining a first adjustment time TR1，TR1Is a positive number, and 0 is more than or equal to TR1Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TR1The turn-off time is T0-TR1+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR1+1/F/6, turn-off time T0-TR1+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR1+1/F/3, turn-off time T0-TR1+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR1+1/F/2, turn-off time T0-TR1+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S15 is T0-TR1+2/F/3, turn-off time T0-TR1+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR1+5/F/6, turn-off time T0-TR1+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
4. The fundamental frequency switched high power factor hvdc transmission converter in accordance with claim 2 further comprising: the switching time and the on-time of the reverse blocking type turn-off devices S21, S22, S23, S24, S25 and S26 are determined as follows:
the switching frequencies of the reverse-resistance type turn-off devices S21, S22, S23, S24, S25 and S26 are all F, the on time in each period of 1/F is 1/F/3, and the off time in each period of 1/F is 2/F/3; defining a second adjustment time TR2，TR2Is a positive number, and 0 is more than or equal to TR2Less than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S21 is T0+TR2The turn-off time is T0+TR2+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR2+1/F/6, turn-off time T0+TR2+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR2+1/F/3, turn-off time T0+TR2+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR2+1/F/2, turn-off time T0+TR2+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR2+2/F/3, turn-off time T0+TR2+ 1/F; the turn-on time of the reverse-resistance type turn-off device S26 is T0+TR2+5/F/6, turn-off time T0+TR2+ 7/F/6; if the condition of more than 1/F occurs in the moment of the switching-on or switching-off, subtracting 1/F from the moment of the switching-on or switching-off to be used as the actual moment of the switching-on or switching-off; if the on or off time is less than 0, the on or off time plus 1/F is used as the actual on or off time.
5. The fundamental frequency switched high power factor hvdc transmission converter in accordance with claim 2 further comprising: when the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the first direct current filter inductor is positivedc1Is less than idc1When the reference value is reached, the first regulation time T is reducedR1Otherwise, increasing the first adjustment time TR1(ii) a When the average voltage value between the direct current side connecting terminals P1 and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is negative, if the current i of the first direct current filter inductor is negativedc1Is less than idc1At the time of the reference value, the first adjustment time T is increasedR1Otherwise, the first adjustment time T is reducedR1(ii) a When the average voltage value between the direct current side connecting terminals P and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is positive, if the current i of the second direct current filter inductor is positivedc2Is less than idc2When the reference value is greater than the first reference value, the second adjustment time T is decreasedR2Otherwise, the second adjustment time T is increasedR2(ii) a When the average voltage value between the direct current side connecting terminals P2 and N of the fundamental frequency switch type high power factor high voltage direct current transmission converter is negative, if the current i of the second direct current filter inductor is negativedc2Is less than idc2At the reference value of (a), the second adjustment time T is increasedR2Otherwise, the second adjustment time T is reducedR2。
6. The fundamental frequency switched high power factor hvdc transmission converter in accordance with claim 5 further comprising: first direct current filter inductor Ldc1And a second dc filter inductor Ldc2Is equal to the inductance value of (1), the first regulation time T in the steady stateR1And a second adjustment time TR2Equal, alternating current ia1，ib1，ic1The fundamental wave components of (1) are all ahead of respective alternating three-phase voltage usa，usb，usc(ii) a Alternating current ia2，ib2，ic2The fundamental wave components of (1) are all lagged by respective AC three-phase voltages usa，usb，usc(ii) a Alternating current iag，ibg，icgThe fundamental wave components of (a) are all connected with respective alternating three-phase voltages usa，usb，uscThe phases are the same.
CN201911008800.7A 2019-10-23 2019-10-23 Fundamental frequency switch type high power factor high voltage DC transmission current converter Pending CN110729748A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201323533Y (en) * 2008-10-23 2009-10-07 四川英杰电气有限公司 24-pulse controlling circuit
CN109450286A (en) * 2018-12-18 2019-03-08 镇江大全赛雪龙牵引电气有限公司 High-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system and control method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201323533Y (en) * 2008-10-23 2009-10-07 四川英杰电气有限公司 24-pulse controlling circuit
CN109450286A (en) * 2018-12-18 2019-03-08 镇江大全赛雪龙牵引电气有限公司 High-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system and control method

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