CN110635706A - Active phase-change type high-voltage direct-current transmission converter - Google Patents
Active phase-change type high-voltage direct-current transmission converter Download PDFInfo
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- CN110635706A CN110635706A CN201911008816.8A CN201911008816A CN110635706A CN 110635706 A CN110635706 A CN 110635706A CN 201911008816 A CN201911008816 A CN 201911008816A CN 110635706 A CN110635706 A CN 110635706A
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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
- 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
Abstract
An active phase-change type high-voltage direct-current transmission converter 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. By adjusting the switching time and the conducting time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15 and S16, the current i flowing through the first direct-current filter inductor is converted into the current idc1Controlling 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. And the three-phase alternating current side current of the active phase-change type high-voltage direct-current transmission converter and the voltage of a connected three-phase alternating current power supply are in the same phase. Under the condition of avoiding the commutation failure of the existing thyristor-based power grid commutation converter, the unit power factor operation of the converter is realized without adopting extra reactive compensation equipment, and the thyristor-based power grid commutation converter has better reliability and economy compared with the prior art.
Description
Technical Field
The invention relates to an active phase-change type high-voltage direct-current transmission converter.
Background
In the field of High Voltage Direct Current (HVDC), an existing Converter mainly includes a thyristor-based grid Commutated Converter (LCC) and a Voltage-Source Converter (VSC) -based flexible dc Converter.
Because the thyristor in LCC-HVDC is a passive commutation device, the turn-off is determined by an external circuit, and the controllable quantity only has a trigger angle, the risk of commutation failure exists, and harmonic wave and 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. Although a Modular Multilevel Converter (MMC) based on a full-bridge type sub-module can realize direct-current side fault ride-through of an HVDC system, compared with a traditional circuit topology based on a half-bridge sub-module, the full-bridge type MMC has the defects that the number of power semiconductors and sub-module capacitors required by the full-bridge type MMC is large, the manufacturing cost of the Converter is high, the loss is remarkably increased, and the popularization and the application of the Converter are limited.
Disclosure of Invention
The invention aims to overcome the defects of the existing HVDC converter technology and provides an active phase-commutation high-voltage direct-current transmission converter.
The invention relates to an active phase-change type 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, a direct-current filter inductor LdcThe first connecting transformer and the second connecting transformer; the three-phase connecting terminals on the three-phase current-intersecting side of the active phase-changing type high-voltage direct-current transmission converter are A, B, C respectively; the primary three-phase connecting terminals of the first connecting transformer are respectively A1, B1 and C1, the secondary three-phase connecting terminals of the first connecting transformer are respectively a1, B1 and C1, and the first connecting transformer isThe primary three-phase connecting terminals A1, B1 and C1 are respectively connected to a three-phase alternating current connecting terminal A, B, C; the primary three-phase connecting terminals of the second coupling transformer are respectively A2, B2 and C2, the secondary three-phase connecting terminals of the second coupling transformer are respectively a2, B2 and C2, and the primary three-phase connecting terminals A2, B2 and C2 of the second coupling transformer are respectively connected to a three-phase alternating-current connecting terminal A, B, C; the anode of the reverse-resistance type turn-off device S11 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S11 is connected to the point a 1; the anode of the reverse-resistance type turn-off device S14 is connected to the point a1, and the cathode of the reverse-resistance type turn-off device S14 is connected to the point M; the anode of the reverse-resistance type turn-off device S13 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S13 is connected to the point b 1; the anode of the reverse-resistance type turn-off device S16 is connected to the point b1, and the cathode of the turn-off device S16 is connected to the point M; the anode of the reverse-resistance type turn-off device S15 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S15 is connected to the point c 1; the anode of the reverse-resistance type turn-off device S12 is connected to the point c1, and the cathode of the reverse-resistance type turn-off device S12 is connected to the point M; the anode of the reverse-resistance type turn-off device S21 is connected to the point M, and the cathode of the turn-off device S21 is connected to the point a 2; the anode of the turn-off capable device S24 is connected to the point a2, and the cathode of the reverse resistance type turn-off capable device S24 is connected to the point N; the anode of the reverse-resistance type turn-off device S23 is connected to the point M, and the cathode of the reverse-resistance type turn-off device S23 is connected to the point b 2; the anode of the reverse-resistance type turn-off device S26 is connected to the point b2, and the cathode of the reverse-resistance type turn-off device S26 is connected to the point N; the anode of the reverse-resistance type turn-off device S25 is connected to the point M, and the cathode of the turn-off device S25 is connected to the point c 2; the anode of the reverse blocking type turn-off capable device S22 is connected to the point c2, and the cathode of the reverse blocking type turn-off capable device S22 is connected to the point N. DC filter inductor LdcOne end of which is connected to the point P, a DC filter inductor LdcThe other end of which is connected to point P1. And the point P is used as a high-voltage direct-current output positive connecting terminal of the active phase change type high-voltage direct-current transmission converter, and the point N is used as a high-voltage direct-current output negative connecting terminal of the active phase change type high-voltage direct-current transmission converter. The current flowing from the primary side three-phase connection terminal A1 of the first connection transformation to the point A is ia1The primary three-phase connection terminal B1 of the first connection transformation flows to the point Bib1The current flowing to the point C of the primary side three-phase connection terminal C1 of the first connection transformation is ic1The current flowing from the primary three-phase connection terminal A2 of the second connection transformer to the point A is ia2The current flowing to the point B from the primary three-phase connection terminal B2 of the second connection transformer is ib2The current flowing to the point C from the primary three-phase connection terminal C2 of the second connection transformer is ic2. The current flowing from the connecting terminal A at the three-phase current intersection side of the active phase-change type high-voltage direct-current transmission converter to the three-phase alternating-current power supply is iagThe current flowing from the three-phase current-intersecting side connection terminal B to the three-phase AC power supply is ibgThe current flowing from the three-phase AC power supply to the connection terminal C on the three-phase current-intersecting side is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2. From point P via DC filter inductor LdcThe current flowing to point P1 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 active phase-change type high-voltage direct current transmission converter are respectively usa、usbAnd uscAnd u issa、usbAnd uscAre equal in voltage amplitude and frequency are all sine waves of F, usaInitial phase angle lead usbInitial phase angle of 120 DEG usbInitial phase angle lead uscThe initial phase angle is 120 deg..
The voltages at the sides a1, B1 and C1 of the first connecting transformer are the same as the phases of the three-phase voltages at the sides A1, B1 and C1, the amplitude ratio is K, and K is a positive number; the voltages at the sides a1, B1 and C1 of the second coupling transformer are the same as the three-phase voltages at the sides A1, B1 and C1 in phase, and the amplitude ratio is also K.
By adjusting the switching time and the on-time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26, the current flows through the DC filter inductor LdcCurrent i ofdcControlling; the switching time and the on-time of the reverse-resistance type turn-off device S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S26 are determined as follows:
u is the three-phase AC source voltage connected to the AC side three-phase connection terminal A, B, C of the active phase-change HVDC converter during 1/F of each cyclesaAnd uscAre all positive and usa＝uscIs defined as T0. The switching frequencies of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26 are all F, the on-angle 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 the adjustment time TR，TRIs a positive number, and 0 is more than or equal to TRLess than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TRThe turn-off time is T0-TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR+1/F/6, turn-off time T0-TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR+1/F/3, turn-off time T0-TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR+1/F/2, turn-off time T0-TR+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S15 is T0-TR+2/F/3, turn-off time T0-TR+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR+5/F/6, turn-off time T0-TR+ 7/F/6; the turn-on time of the reverse-resistance type turn-off device S21 is T0+TRThe turn-off time is T0+TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR+1/F/6, turn-off time T0+TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR+1/F/3, turn-off time T0+TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR+1/F/2, turn-off time T0+TR+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR+2/F/3, turn-off time T0+TR+ 1/F; reverse resistance type canThe turn-on time of the turn-off device S26 is T0+TR+5/F/6, turn-off time T0+TR+ 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.
By adjusting said adjustment time TRConvection current passing through DC filter inductor LdcCurrent i ofdcControlling; when the average voltage value between the direct current side connecting terminals P and N of the active phase-change type high-voltage direct-current transmission converter is positive, if the current i of the direct current filter inductor is positivedcIs less than idcAt the reference value of (1), the adjustment time T is reducedROtherwise, increase the adjustment time TR(ii) a When the average voltage value between the direct current side connecting terminals P and N of the active phase-conversion type high-voltage direct-current transmission converter is negative, if the current i of the direct current filter inductor is negativedcIs less than idcAt the reference value of (1), the adjustment time T is increasedROtherwise, the regulation time T is reducedR。
In the active phase-change type high-voltage direct-current transmission converter, the 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 an active phase-change type HVDC converter circuit of the present invention;
fig. 2 is a simulation waveform diagram of a three-phase alternating-current side a-phase voltage and current when the active phase-change type 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 an active phase-change type high-voltage direct-current transmission converter circuit of the invention. The active phase-change type 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, direct-current filter inductance LdcA first coupling transformer 1 and a second coupling transformer 2; the three-phase connecting terminals on the three-phase current-intersecting side of the active phase-changing type high-voltage direct-current transmission converter are A, B, C respectively; the primary three-phase connecting terminals of the first connecting transformer 1 are respectively A1, B1 and C1, the secondary three-phase connecting terminals of the first connecting transformer 1 are respectively a1, B1 and C1, and the primary three-phase connecting terminals A1, B1 and C1 of the first connecting transformer 1 are respectively connected to the three-phase alternating-current connecting terminal A, B, C; the primary three-phase connecting terminals of the second coupling transformer 2 are respectively A2, B2 and C2, the secondary three-phase connecting terminals of the second coupling transformer 2 are respectively a2, B2 and C2, and the primary three-phase connecting terminals A2, B2 and C2 of the second coupling transformer 2 are respectively connected to the three-phase alternating-current connecting terminal A, B, C; the anode of the reverse-resistance type turn-off device S11 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S11 is connected to the point a 1; the anode of the reverse-resistance type turn-off device S14 is connected to the point a1, and the cathode of the reverse-resistance type turn-off device S14 is connected to the point M; the anode of the reverse-resistance type turn-off device S13 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S13 is connected to the point b 1; the anode of the reverse-resistance type turn-off device S16 is connected to the point b1, and the cathode of the reverse-resistance type turn-off device S16 is connected to the point M; the anode of the reverse-resistance type turn-off device S15 is connected to the point P1, and the cathode of the reverse-resistance type turn-off device S15 is connected to the point c 1; the anode of the reverse-resistance type turn-off device S12 is connected to the point c1, and the cathode of the reverse-resistance type turn-off device S12 is connected to the point M; the anode of the reverse-resistance type turn-off device S21 is connected to the point M, and the cathode of the reverse-resistance type turn-off device S21 is connected to the point a 2; the anode of the reverse-resistance type turn-off device S24 is connected to the point a2, and the cathode of the reverse-resistance type turn-off device S24 is connected to the point N; the anode of the reverse-resistance type turn-off device S23 is connected to the point M, and the reverse-resistance type turn-off deviceThe cathode of device S23 is connected to point b 2; the anode of the reverse-resistance type turn-off device S26 is connected to the point b2, and the cathode of the reverse-resistance type turn-off device S26 is connected to the point N; the anode of the reverse-resistance type turn-off device S25 is connected to the point M, and the cathode of the reverse-resistance type turn-off device S25 is connected to the point c 2; the anode of the reverse blocking type turn-off capable device S22 is connected to the point c2, and the cathode of the reverse blocking type turn-off capable device S22 is connected to the point N. DC filter inductor LdcOne end of which is connected to the point P, a DC filter inductor LdcThe other end of which is connected to point P1. And the point P is used as a high-voltage direct-current output positive connecting terminal of the active phase change type high-voltage direct-current transmission converter, and the point N is used as a high-voltage direct-current output negative connecting terminal of the active phase change type high-voltage direct-current transmission converter. The current flowing from the primary three-phase connection terminal A1 of the first connection transformer 1 to the point A is ia1The current flowing from the primary three-phase connection terminal B1 to point B of the first connecting transformer 1 is ib1The current flowing to the point C from the primary three-phase connection terminal C1 of the first connecting transformer 1 is ic1The current flowing from the primary three-phase connection terminal A2 of the second connection transformer 2 to the point A is ia2The current flowing to the point B from the primary three-phase connection terminal B2 of the second joint transformer 2 is ib2The current flowing to the point C from the primary three-phase connection terminal C2 of the second joint transformer 2 is ic2. The current flowing from the primary three-phase connecting terminal A of the first connecting transformer 1 to the three-phase alternating current power supply of the active phase-change type high-voltage direct-current transmission converter is iagThe current flowing from the primary three-phase connection terminal B of the first connecting transformer 1 to the three-phase AC power supply is ibgThe current flowing from the primary three-phase connection terminal C of the first connecting transformer 1 to the three-phase AC power supply is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2. From point P via DC filter inductor LdcThe current flowing to point P1 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 active phase-change type 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 is 120 deg..
The voltages at the sides a1, B1 and C1 of the first connecting transformer 1 have the same phase as the three-phase voltages at the sides A1, B1 and C1, the amplitude ratio is K, and K is a positive number; the voltages at the sides a1, B1 and C1 of the second coupling transformer 2 have the same phase as the three-phase voltages at the sides A1, B1 and C1, and the amplitude ratio is also K.
By adjusting the switching time and the on-time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26, the current flows through the DC filter inductor LdcCurrent i ofdcControlling; the switching time and the on-time of the reverse-resistance type turn-off device S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S26 are determined as follows:
the three-phase AC power voltage u connected with the AC side three-phase connection terminal A, B, C of the active phase-change HVDC converter is 1/F in each periodsaAnd uscAre all positive and usa＝uscIs defined as T0. The switching frequencies of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26 are all F, the on-angle 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 the adjustment time TR，TRIs a positive number, and 0 is more than or equal to TRLess than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TRThe turn-off time is T0-TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR+1/F/6, turn-off time T0-TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR+1/F/3, turn-off time T0-TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR+1/F/2, turn-off time T0-TR+ 5/F/6; reverse blocking type turn-off deviceThe opening time of the element S15 being T0-TR+2/F/3, turn-off time T0-TR+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR+5/F/6, turn-off time T0-TR+ 7/F/6; the turn-on time of the reverse-resistance type turn-off device S21 is T0+TRThe turn-off time is T0+TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR+1/F/6, turn-off time T0+TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR+1/F/3, turn-off time T0+TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR+1/F/2, turn-off time T0+TR+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR+2/F/3, turn-off time T0+TR+ 1/F; the turn-on time of the reverse-resistance type turn-off device S26 is T0+TR+5/F/6, turn-off time T0+TR+ 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.
By adjusting said adjustment time TRTo the current-flowing DC filter inductance LdcCurrent i ofdcControlling; when the average voltage value between the direct current side connecting terminals P and N of the active phase-change type high-voltage direct-current transmission converter is positive, if the current i of the direct current filter inductor is positivedcIs less than idcAt the reference value of (1), the adjustment time T is reducedROtherwise, increase the adjustment time TR(ii) a When the average voltage value between the direct current side connecting terminals P and N of the active phase-conversion type high-voltage direct-current transmission converter is negative, if the current i of the direct current filter inductor is negativedcIs less than idcAt the reference value of (1), the adjustment time T is increasedROtherwise, the regulation time T is reducedR。
In the active phase-change type high-voltage direct-current transmission converter, 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 three-phase alternating-current side a-phase voltage and current when the active phase-change type high-voltage direct-current transmission converter adopts the control method. As shown in fig. 2, the effective value of the three-phase ac power line voltage is 1000V, the frequency is 50Hz, the amplitudes and phases of the primary and secondary voltages of the three-phase connection transformer T1 and the three-phase connection transformer T2 are the same, the transformation ratios of the three-phase connection transformer T1 and the three-phase connection transformer T2 are all K1, and the dc current i is 1dcAdjust time T1000ARSet 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. The fundamental power factor for a three-phase ac power supply is almost 1. According to the active phase-change type high-voltage direct-current transmission converter, when the control method is adopted, the high-power-factor operation is realized without additional reactive compensation equipment. 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 the thyristor-based power grid commutation converter can be solved, and the thyristor-based power grid commutation converter is safer and more economical.
Claims (5)
1. An active commutation type HVDC converter, characterized in that: the active phase-change type 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, direct-current filter inductance LdcA first coupling transformer (1) anda second coupling transformer (2); the three-phase connecting terminals on the three-phase current-intersecting side of the active phase-changing type high-voltage direct-current transmission converter are A, B, C respectively; the primary three-phase connecting terminals of the first connecting transformer (1) are respectively A1, B1 and C1, the secondary three-phase connecting terminals of the first connecting transformer (1) are respectively a1, B1 and C1, and the primary three-phase connecting terminals A1, B1 and C1 of the first connecting transformer (1) are respectively connected to a three-phase alternating current connecting terminal A, B, C; the primary three-phase connecting terminals of the second coupling transformer (2) are respectively A2, B2 and C2, the secondary three-phase connecting terminals of the second coupling transformer (2) are respectively a2, B2 and C2, and the primary three-phase connecting terminals A2, B2 and C2 of the second coupling transformer (2) are respectively connected to the three-phase alternating current connecting terminal A, B, C; 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 device S14 is connected to the point a1, and the cathode of S14 is connected to the point M; 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 b 1; the anode of S16 is connected to point b1, and the cathode of S16 is connected to point M; the anode of the S15 is connected to the point P1, and the cathode of the reverse blocking type turn-off device S15 is connected to the point c 1; 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 M; the anode of the reverse blocking type turn-off device S21 is connected to the point M, 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 M, and the cathode of S23 is connected to the point b 2; the anode of the reverse blocking type turn-off capable 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 M, and the cathode of S25 is connected to the point c 2; 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; DC filter inductor LdcOne end of which is connected to point P and the other end is connected to point P1; the point P is used as a high-voltage direct-current output positive connecting terminal of the active phase change type high-voltage direct-current transmission converter, and the point N is used as a high-voltage direct-current output negative connecting terminal of the active phase change type 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 ic1From point A2The current flowing to the 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 from the point A to the three-phase alternating current power supply of the active phase-change type high-voltage direct current transmission converter is iagThe current flowing from the point B to the three-phase AC power supply is ibgThe current flowing from the point C to the three-phase AC power supply is icgAnd satisfies the following conditions: i.e. iag＝ia1+ia2，ibg＝ib1+ib2，icg＝ic1+ic2(ii) a From point P via DC filter inductor LdcThe current flowing to point P1 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 active phase-change type 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 is 120 deg..
2. The active commutation type hvdc transmission converter in accordance with claim 1, wherein: the voltage at the sides a1, B1 and C1 of the first connecting transformer (1) is the same as the phase of the three-phase voltage at the sides A1, B1 and C1, the ratio of the amplitude is K, and K is a positive number; the voltages at the sides a1, B1 and C1 of the second coupling transformer (2) have the same phase as the three-phase voltages at the sides A1, B1 and C1, and the amplitude ratio is K.
3. The active commutation type hvdc transmission converter in accordance with claim 1, wherein: the current flows through the DC filter inductor L by adjusting the switching time and the conducting time of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26dcCurrent i ofdcControlling; the switching time and the on-time of the reverse-resistance type turn-off device S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S26 are determined as follows: within 1/F of each cycle, the active commutationThree-phase AC power source voltage u connected to AC side three-phase connection terminal A, B, C of type HVDC convertersaAnd uscAre all positive, and usa＝uscIs defined as T0(ii) a The switching frequencies of the reverse-resistance type turn-off devices S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25 and S26 are all F, the on-angle 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 the adjustment time TR，TRIs a positive number, and 0 is more than or equal to TRLess than or equal to 1/F/2, and the turn-on time of the reverse resistance type turn-off device S11 is T0-TRThe turn-off time is T0-TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S12 is T0-TR+1/F/6, turn-off time T0-TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S13 is T0-TR+1/F/3, turn-off time T0-TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S14 is T0-TR+1/F/2, turn-off time T0-TR+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S15 is T0-TR+2/F/3, turn-off time T0-TR+ 1/F; the turn-on time of the reverse-resistance type turn-off device S16 is T0-TR+5/F/6, turn-off time T0-TR+ 7/F/6; the turn-on time of the reverse-resistance type turn-off device S21 is T0+TRThe turn-off time is T0+TR+ 1/F/3; the turn-on time of the reverse-resistance type turn-off device S22 is T0+TR+1/F/6, turn-off time T0+TR+ 1/F/2; the turn-on time of the reverse-resistance type turn-off device S23 is T0+TR+1/F/3, turn-off time T0+TR+ 2/F/3; the turn-on time of the reverse-resistance type turn-off device S24 is T0+TR+1/F/2, turn-off time T0+TR+ 5/F/6; the turn-on time of the reverse-resistance type turn-off device S25 is T0+TR+2/F/3, turn-off time T0+TR+ 1/F; the turn-on time of the reverse-resistance type turn-off device S26 is T0+TR+5/F/6, at turn-offIs carved as T0+TR+ 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 active commutation type hvdc transmission converter in accordance with claim 3, wherein: by adjusting said adjustment time TRTo the current-flowing DC filter inductance LdcCurrent i ofdcControlling; when the average voltage value between the direct current side connecting terminals P and N of the active phase-change type high-voltage direct-current transmission converter is positive, if the current i of the direct current filter inductor is positivedcIf it is less than the reference value, the control time T is reducedROtherwise, increase the adjustment time TR(ii) a When the average voltage value between the direct current side connecting terminals P and N of the active phase-conversion type high-voltage direct-current transmission converter is negative, if the current i of the direct current filter inductor is negativedcIf it is less than the reference value, the adjustment time T is increasedROtherwise, the regulation time T is reducedR。
5. The active phase change hvdc transmission converter in accordance with claim 1 further comprising: 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.
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| GB2113927B (en) * | 1982-01-18 | 1985-05-09 | Frank Tasman Bennell | Polyphase rectifiers |
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| CN103323790A (en) * | 2013-06-07 | 2013-09-25 | 华北电力大学 | Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault |
| CN107359638A (en) * | 2017-04-10 | 2017-11-17 | 华北电力大学 | A kind of multiport DC transformation system for possessing step-less adjustment DC voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2113927B (en) * | 1982-01-18 | 1985-05-09 | Frank Tasman Bennell | Polyphase rectifiers |
| CN201323533Y (en) * | 2008-10-23 | 2009-10-07 | 四川英杰电气有限公司 | 24-pulse controlling circuit |
| CN102231520A (en) * | 2011-06-20 | 2011-11-02 | 浙江大学 | Hybrid DC (direct current) electric power transmission system |
| CN103323790A (en) * | 2013-06-07 | 2013-09-25 | 华北电力大学 | Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault |
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Application publication date: 20191231 |