CN113300618B - Series 36-pulse rectifier based on series-parallel mixed pulse multiplying circuit - Google Patents

Series 36-pulse rectifier based on series-parallel mixed pulse multiplying circuit Download PDF

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CN113300618B
CN113300618B CN202110599937.5A CN202110599937A CN113300618B CN 113300618 B CN113300618 B CN 113300618B CN 202110599937 A CN202110599937 A CN 202110599937A CN 113300618 B CN113300618 B CN 113300618B
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rectification circuit
phase
diode
transformer
circuit
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CN113300618A (en
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王景芳
陈安臣
姚绪梁
吕雨生
何啸
李磊
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Harbin Engineering University
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Harbin Engineering University
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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
    • H02M7/02—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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer

Abstract

A series 36-pulse rectifier based on a series-parallel mixed pulse multiplying circuit belongs to the technical field of power electronics. The invention aims to solve the problem of how to improve the current harmonic suppression capability of a series 12-pulse rectifier on the premise of basically not increasing the complexity of the rectifier. The invention comprises a phase-shifting transformer, a first three-phase full-bridge rectification circuit, a second three-phase full-bridge rectification circuit, a balance reactor with a center tap, and a capacitor C1Capacitor C2And a serial-parallel hybrid pulse wave multiplier circuit; the series-parallel mixed pulse wave multiplying circuit comprises a transformer with double secondary windings, a first single-phase rectification circuit and a second single-phase rectification circuit, and through alternate conduction of rectification elements connected with secondary sides of the transformer with the double secondary windings, a specific circulating current is formed on a direct current side, low-order harmonic waves in input current of a rectifier are offset, the effect of increasing 3 times of rectifier pulse wave number is achieved, and suppression of network side harmonic waves is achieved. The method is suitable for high-power rectification occasions with higher requirements on the quality of electric energy.

Description

Series 36-pulse rectifier based on series-parallel mixed pulse multiplying circuit
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a multi-pulse rectifier.
Background
The 12-pulse rectifier has the advantages of simple structure, high reliability, low price and the like, and is widely applied to medium-high voltage and high-power industrial occasions such as ship electric propulsion, urban rail power supply, high-voltage direct-current transmission and the like. However, the 12-pulse rectifier still generates more harmonics due to the strong nonlinearity of the rectifier diodes in the rectifier. When used alone, the THD of the input current of the 12-pulse rectifier is usually more than 10%, which can not meet the requirements of harmonic standards such as IEEE-519 and IEC-16, and becomes the main harmonic source of the power grid.
Although the number of pulses of the rectifier can be further increased by phase-shifting multiple connections, and the input current harmonic of the rectifier is further reduced, the structure of the phase-shifting transformer becomes more complicated, the manufacturing difficulty is increased, and the number of rectifier devices is multiplied, so that the complexity and the cost of the rectifier are increased. Although the double-tap converter is adopted, the series 12-pulse rectifier can be upgraded to the 24-pulse rectifier on the premise of basically not increasing the complexity of the rectifier, the input current harmonic of the rectifier is still high, and the requirement of industrial application cannot be met in many times. Therefore, it is an urgent need to solve the problem of how to significantly improve the current harmonic suppression capability of the series 12-pulse rectifier without increasing the complexity of the rectifier.
Disclosure of Invention
The invention aims to solve the problem of how to improve the current harmonic suppression capability of a series 12-pulse rectifier on the premise of basically not increasing the complexity of the rectifier, and provides a series 36-pulse rectifier based on a series-parallel mixed pulse multiplication circuit.
A series 36-pulse rectifier based on a series-parallel mixed pulse multiplying circuit comprises a phase-shifting transformer, a first three-phase full-bridge rectification circuit, a second three-phase full-bridge rectification circuit, a balance reactor with a center tap, and a capacitor C1Capacitor C2A parallel-serial composite pulse wave multiplying circuit; the series-parallel mixed pulse wave multiplying circuit comprises a transformer with double secondary windings, a first single-phase rectifying circuit and a second single-phase rectifying circuit, the first single-phase rectifying circuit is connected with a load in parallel, and the second single-phase rectifying circuit is connected with the load in series;
the phase-shifting transformer is used for shifting the phase of three-phase voltage input by a power grid to generate two three-phase voltages with the phase difference of 30 degrees and the same amplitude, and respectively sending the two three-phase voltages generated by the phase-shifting transformer to the first three-phase full-bridge rectification circuit and the second three-phase full-bridge rectification circuit;
the first three-phase full-bridge rectification circuit and the second three-phase full-bridge rectification circuit are connected in series, the negative output end of the first three-phase full-bridge rectification circuit and the positive output end of the second three-phase full-bridge rectification circuit are intersected at a point P, the point P is connected with the dotted end of a primary winding of the transformer with the double secondary windings, and the dotted end of the primary winding of the transformer with the double secondary windings is connected with a center tap of the balance reactor with the center tap;
two ends of a first secondary winding of the transformer with the double secondary windings are respectively connected with two input ends of a first single-phase rectification circuit, and a positive output end of the first single-phase rectification circuit is connected with a positive output end of a first three-phase full-bridge rectification circuit and then is connected with a positive input end of a load as a positive output end of a 36-pulse rectifier; the positive output end of the first single-phase rectification circuit is connected with a capacitor C1Is connected with one end of the connecting rod; after the negative output end of the first single-phase rectification circuit is connected with the negative output end of the second single-phase rectification circuit, the negative output end of the 36-pulse rectifier is connected with the negative input end of the load;
two ends of a second secondary winding of the transformer with the double secondary windings are respectively connected with two input ends of a second single-phase rectification circuit, and a positive output end of the second single-phase rectification circuit, a negative output end of a second three-phase full-bridge rectification circuit and a capacitor C2Are connected at the same time;
one end of balance reactor with center tap and capacitor C1Is connected with the other end of the balance reactor with a center tap and the other end of the capacitor C2The other end of the connecting rod is connected.
Preferably, the first three-phase full-bridge rectification circuit and the second three-phase full-bridge rectification circuit are both rectification circuits implemented by diodes.
Preferably, the first single-phase rectification circuit and the second single-phase rectification circuit are both implemented by a single-phase full-bridge rectification circuit or a single-phase full-wave rectification circuit.
Preferably, the number of turns N of the first secondary winding of the transformer with double secondary windings ismNumber of turns N of its primary windingxThe ratio m1 is 43; number of turns N of second secondary winding of transformer with double secondary windingspNumber of turns N of its primary windingxThe ratio is 0.652.
Preferably, the capacitance C1And a capacitor C2Have the same capacitance value.
Preferably, the first single phase rectifierThe current circuit comprising a diode Dm1Diode Dm2Diode Dm3And a diode Dm4；
Diode Dm1Anode of (2) and diode Dm2After the cathode of the transformer is connected, the cathode is used as one input end of a first single-phase rectification circuit and is connected with one end of a first secondary winding of the transformer with double secondary windings;
diode Dm1Cathode and diode Dm3After being connected, the cathode of the first single-phase rectification circuit is used as the positive output end of the first single-phase rectification circuit;
diode Dm3Anode of (2) and diode Dm4After the cathode of the transformer is connected, the other input end of the first single-phase rectification circuit is connected with the other end of the first secondary winding of the transformer with the double secondary windings;
diode Dm2Anode of (2) and diode Dm4After being connected, the anode of the first single-phase rectification circuit is used as the negative output end of the first single-phase rectification circuit;
the second single-phase rectification circuit comprises a diode Dp1Diode Dp2Diode Dp3And a diode Dp4；
Diode Dp1Anode of (2) and diode Dp2After the cathode of the transformer is connected, the second single-phase rectification circuit is used as one input end of a second single-phase rectification circuit and is connected with one end of a second secondary winding of the transformer with double secondary windings;
diode Dp1Cathode and diode Dp3The cathode of the second single-phase rectification circuit is connected and then used as the positive output end of the second single-phase rectification circuit;
diode Dp3Anode of (2) and diode Dp4After the cathode of the transformer is connected, the other input end of the second single-phase rectification circuit is connected with the other end of the second secondary winding of the transformer with the double secondary windings;
diode Dp2Anode of (2) and diode Dp4And then the anode of the second single-phase rectification circuit is connected to be used as the negative output end of the second single-phase rectification circuit.
Preferably, the series-parallel hybrid pulse wave multiplying circuit includes four operating modes, specifically:
the first working mode is as follows: referring to fig. 3, the input voltage u due to the first single-phase rectification circuit connected in parallel across the loadmA diode D in the first single-phase rectification circuit being less than the voltage across the loadm1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, so that the output current i of the first single-phase rectification circuitmIs zero; voltage u of primary winding of transformer with double secondary windingsxGreater than zero, input voltage u of the second single-phase rectification circuitpLarger than zero, diode D in the second single-phase rectification circuitp2、Dp3Are conducted and all currents flowing through them are ipThe pulse wave rectifier passes through a diode D in the second single-phase rectification circuitp2、Dp3Supplying power to a load;
and a second working mode: referring to fig. 4, the input voltage-u due to the first single-phase rectification circuit connected in parallel across the loadmA diode D in the first single-phase rectification circuit being less than the voltage across the loadm1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, so that the output current i of the first single-phase rectification circuitmIs zero; voltage u of primary winding of transformer with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuitpLess than zero, diode D in the second single-phase rectification circuitp1、Dp4Is conducted through Dp1And Dp4All currents of are ipThe pulse wave rectifier passes through a diode D in the second single-phase rectification circuitp1、Dp4To power the load.
And a third working mode: referring to fig. 5, in this mode, the input voltage u due to the first single-phase rectification circuit connected in parallel across the loadmA diode D in the first single-phase rectification circuit higher than the voltage across the loadm2、Dm3Is conducted through Dm2And Dm3All currents of are imTherefore, the output current of the first single-phase rectification circuit is im(ii) a Voltage u of primary winding of transformer with double secondary windingsxGreater than zero, input voltage u of second single-phase rectification circuitpLarger than zero, diode D in the second single-phase rectification circuitp2、Dp3Is conducted through Dp2And Dp3All currents of are ipThe rectifier passes through the diode of the second single-phase rectification circuitp2、Dp3And a diode D having an output connected in parallel to the first single-phase rectification circuit across the loadm2、Dm3Together supply power to the load;
and a fourth working mode: referring to fig. 6, in this mode, the input voltage-u due to the first single-phase rectification circuit connected in parallel across the loadmA diode D in the first single-phase rectification circuit higher than the voltage across the loadm1、Dm4Is conducted and flows through the diode Dm1、Dm4All currents of are imTherefore, the output current of the first single-phase rectification circuit is im(ii) a Voltage u of primary winding of transformer with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuitpLess than zero, diode D in the second single-phase rectification circuitp1、Dp4Is conducted and flows through the diode Dp1、Dp4All currents of are ipThe rectifier passes through a diode D in the second single-phase rectification circuitp1、Dp4And a diode D having an output connected in parallel to the first single-phase rectification circuit across the loadm1、Dm4Together supplying power to the load.
The series-parallel mixed pulse wave multiplying circuit based on the series-parallel mixed pulse wave multiplying circuit has the advantages that the series-parallel mixed pulse wave multiplying circuit based on the series-parallel mixed pulse wave multiplying circuit forms specific circulation on the direct current side through the alternate conduction of the rectifying elements connected with the secondary side of the transformer with the double secondary side windings, low-order harmonics in input current of the rectifier are offset, the effect of improving the pulse wave number of the rectifier by 3 times is achieved, and the suppression of network side harmonics is achieved.
In the series 36-pulse rectifier based on the series-parallel mixed pulse multiplying circuit, all harmonic suppression devices are passive devices, a control circuit is not needed, and the series 36-pulse rectifier based on the series-parallel mixed pulse multiplying circuit has the advantages of simple circuit structure, easiness in implementation, low cost and the like; the harmonic suppression method of the series-parallel mixed pulse wave multiplication circuit provided by the invention has strong portability and can be applied to 12 pulse wave rectifiers in other forms;
the series 36-pulse rectifier based on the series-parallel mixed pulse multiplying circuit can realize the function of multiplying the pulse number of the rectifier by 3, further reduce the pulse coefficient of load voltage, increase the step number of input current of the rectifier, and tend to a sine wave more, and reduce the THD of the input current.
The invention has obvious effects of improving the electric energy quality of the input current and reducing the THD of the input current, and is suitable for high-power rectification occasions with higher requirements on the electric energy quality.
Drawings
FIG. 1 is a schematic diagram of a series 36-pulse rectifier based on a series-parallel hybrid pulse multiplier circuit according to the present invention;
fig. 2 is a schematic diagram of the winding structure of the transformer 4 with double secondary windings.
Fig. 3 is a working diagram of the serial-parallel hybrid pulse multiplier circuit in the working mode one.
Fig. 4 is a working diagram of the serial-parallel hybrid pulse multiplier circuit in the second working mode.
Fig. 5 is a working diagram of the serial-parallel hybrid pulse multiplier circuit in the third working mode.
Fig. 6 is a working diagram of the serial-parallel hybrid pulse multiplier circuit in the fourth working mode.
In FIGS. 1 to 6, ia、ib、icThe three-phase input currents of a, b and c of the phase-shifting transformer 1 are respectively;
ua、ub、ucthree-phase alternating current voltage sources of a, b and c which are respectively input to the phase-shifting transformer 1 from a power grid;
ia1、ib1、ic1three-phase currents of a, b and c input to the first three-phase full-bridge rectifier circuit 2;
ia2、ib2、ic2are respectively input to a second three-phase full-bridge rectifierThree-phase currents of a, b and c of the circuit 3;
udis the load voltage;
ud1is the output voltage of the first three-phase full-bridge rectification circuit 2;
ud2is the output voltage of the second three-phase full-bridge rectification circuit 3;
umand upThe first secondary winding voltage and the second secondary winding voltage of the transformer 4 with double secondary windings are respectively;
uxthe voltage of a primary winding of a transformer 4 with double secondary windings;
id1is the output current of the first three-phase full-bridge rectification circuit 2;
id2is a current input from the load side to the second three-phase full-bridge rectifier circuit 3;
ixis the primary winding current of the transformer 4 with double secondary windings;
idis the load current;
imand ipOutput currents of the first single-phase rectification circuit 5 and the second single-phase rectification circuit 6, respectively;
iC1、iC2separate capacitance C1Capacitor C2The output current of (1).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
This embodiment will be described with reference to fig. 1 and 2, and the series-parallel hybrid pulse multiplier circuit-based series 36-pulse rectifier according to this embodiment includesPhase-shifting transformer 1, first three-phase full-bridge rectification circuit 2, second three-phase full-bridge rectification circuit 3, balance reactor 7 with center tap, capacitor C1Capacitor C2A parallel-serial composite pulse wave multiplying circuit; the series-parallel mixed pulse wave multiplying circuit comprises a transformer 4 with double secondary windings, a first single-phase rectification circuit 5 and a second single-phase rectification circuit 6, the first single-phase rectification circuit 5 is connected with a load 8 in parallel, and the second single-phase rectification circuit 6 is connected with the load 8 in series;
the phase-shifting transformer 1 is used for shifting the phase of three-phase voltage input by a power grid to generate two three-phase voltages with the phase difference of 30 degrees and the same amplitude, and respectively sending the two three-phase voltages generated by the phase-shifting transformer 1 to the first three-phase full-bridge rectification circuit 2 and the second three-phase full-bridge rectification circuit 3;
the first three-phase full-bridge rectification circuit 2 and the second three-phase full-bridge rectification circuit 3 are connected in series, the negative output end of the first three-phase full-bridge rectification circuit 2 and the positive output end of the second three-phase full-bridge rectification circuit 3 are intersected at a point P, the point P is connected with the dotted end of the primary side winding of the transformer 4 with the double secondary windings, and the dotted end of the primary side winding of the transformer 4 with the double secondary windings is connected with the center tap of the balance reactor 7 with the center tap;
two ends of a first secondary winding of the transformer 4 with double secondary windings are respectively connected with two input ends of a first single-phase rectification circuit 5, and after a positive output end of the first single-phase rectification circuit 5 is connected with a positive output end of a first three-phase full-bridge rectification circuit 2, the positive output end of the first single-phase rectification circuit is connected with a positive input end of a load 8 as a positive output end of a 36-pulse rectifier; the positive output end of the first single-phase rectification circuit 5 is connected with a capacitor C1Is connected with one end of the connecting rod; after the negative output end of the first single-phase rectification circuit 5 is connected with the negative output end of the second single-phase rectification circuit 6, the negative output end of the 36-pulse rectifier is connected with the negative input end of the load 8;
two ends of a second secondary winding of the transformer 4 with double secondary windings are respectively connected with two input ends of a second single-phase rectification circuit 6, and a positive output end of the second single-phase rectification circuit 6, a negative output end of a second three-phase full-bridge rectification circuit 3 and a capacitor C2Are connected at the same time;
one end of balance reactor 7 with center tap and capacitor C1Is connected with the other end of the balance reactor 7 with a center tap, and the other end of the balance reactor 7 with a center tap is connected with the capacitor C2The other end of the connecting rod is connected.
In this embodiment, the capacitor C is used in concrete applications1Capacitor C2Realized by using large capacitors, capacitor C1Capacitor C2Connected in series with a balance reactor 7 with a center tap, a capacitor C1Capacitor C2The function of the magnetic circuit is to cut off direct current components in the circuit and avoid large current generated by direct current, so that the balance reactor 7 with a center tap is burnt and the magnetic circuit is saturated.
The series-parallel mixed pulse multiplication circuit forms a specific circulating current on a direct current side through the alternate conduction of the rectifying elements connected with the secondary side of the transformer 4 with double secondary side windings, and thereby counteracts low-order harmonics in rectifier input current, achieves the effect of improving 3 times of rectifier pulse number, and realizes the suppression of network side harmonics.
When the transformer 4 with the double-secondary winding is applied, the double-secondary winding of the transformer 4 with the double-secondary winding can adopt a structure with or without a center tap according to actual needs.
Further, the first three-phase full-bridge rectification circuit 2 and the second three-phase full-bridge rectification circuit 3 are both rectification circuits implemented by using diodes.
Furthermore, the first single-phase rectification circuit 5 and the second single-phase rectification circuit 6 are both implemented by a single-phase full-bridge rectification circuit or a single-phase full-wave rectification circuit. When the single-phase full-bridge rectification circuit is used, the first single-phase rectification circuit 5 and the second single-phase rectification circuit 6 are both realized by adopting a single-phase full-bridge rectification circuit or a single-phase full-wave rectification circuit, and are selected according to actual needs.
Further, referring specifically to fig. 2, the number of turns N of the first secondary winding of the transformer 4 with double secondary windingsmNumber of turns N of its primary windingxThe ratio of the two is 43; number of turns N of second secondary winding of transformer 4 with double secondary windingspNumber of turns N of its primary windingxThe ratio is 0.652.
In this embodiment, Nm/Nx＝43，Np/NxAt 0.652, the input current to the primary side of the phase-shifting transformer 1 is 36 pulses, and the input current THD reaches a minimum value of 5.06%.
Further, with particular reference to FIG. 1, capacitor C1And a capacitor C2Have the same capacitance value.
Further, with particular reference to fig. 1, the first single-phase rectification circuit 5 comprises a diode Dm1Diode Dm2Diode Dm3And a diode Dm4；
Diode Dm1Anode of (2) and diode Dm2Is connected as one input end of a first single-phase rectification circuit 5 with one end of a first secondary winding of a transformer 4 with double secondary windings;
diode Dm1Cathode and diode Dm3Is connected as the positive output end of the first single-phase rectification circuit 5;
diode Dm3Anode of (2) and diode Dm4As the other input end of the first single-phase rectification circuit 5 is connected with the other end of the first secondary winding of the transformer 4 with double secondary windings after the cathode of the transformer is connected;
diode Dm2Anode of (2) and diode Dm4Is connected as the negative output end of the first single-phase rectification circuit 5;
the second single-phase rectification circuit 6 includes a diode Dp1Diode Dp2Diode Dp3And a diode Dp4；
Diode Dp1Anode of (2) and diode Dp2As one input end of a second single-phase rectification circuit 6, is connected with one end of a second secondary winding of the transformer 4 with double secondary windings after the cathode of the transformer is connected;
diode Dp1Cathode and diode Dp3After being connected, the cathode of the second single-phase rectification circuit 6 is used as the positive output end of the second single-phase rectification circuit;
diode Dp3Anode of (2) and diode Dp4Is connected as the other input terminal of the second single-phase rectification circuit 6 with the second input terminal of the transformer 4 with double secondary windingsThe other end of the secondary winding is connected;
diode Dp2Anode of (2) and diode Dp4Is connected to serve as the negative output terminal of the second single-phase rectification circuit 6.
Further, referring to fig. 3 to 6, the serial-parallel hybrid pulse multiplication circuit includes four operation modes, specifically:
the first working mode is as follows: referring to fig. 3, the input voltage u due to the first single-phase rectification circuit 5 connected in parallel across the load 8mA diode D in the first single-phase rectification circuit 5 which is lower than the voltage across the load 8m1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, and therefore, the output current i of the first single-phase rectification circuit 5mIs zero; voltage u of primary winding of transformer 4 with double secondary windingsxGreater than zero, input voltage u of the second single-phase rectification circuit 6pLarger than zero, diode D in the second single-phase rectification circuit 6p2、Dp3Is conducted and the current flowing through the two is ipThe pulse wave rectifier passes through a diode D in the second single-phase rectification circuit 6p2、Dp3Power is supplied to the load 8;
and a second working mode: referring to fig. 4, due to the input voltage-u of the first single-phase rectification circuit 5 connected in parallel across the load 8mA diode D in the first single-phase rectification circuit 5 which is lower than the voltage across the load 8m1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, so that the output current i of the first single-phase rectification circuit 5 is zeromIs zero; voltage u of the primary winding of a transformer 4 with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuit 6pLess than zero, diode D in the second single-phase rectification circuit 6p1、Dp4Is conducted through Dp1And Dp4All currents of are ipThe pulse wave rectifier passes through a diode D in the second single-phase rectification circuit 6p1、Dp4To supply the load 8.
And a third working mode: referring to FIG. 5, inIn this mode, the input voltage u due to the first single-phase rectification circuit 5 connected in parallel across the load 8mGreater than the voltage across the load 8, diode D in the first single-phase rectification circuit 5m2、Dm3Is conducted through Dm2And Dm3All currents of are imTherefore, the output current of the first single-phase rectification circuit 5 is im(ii) a Voltage u of the primary winding of a transformer 4 with double secondary windingsxGreater than zero, input voltage u of the second single-phase rectification circuit 6pLarger than zero, diode D in the second single-phase rectification circuit 6p2、Dp3Is conducted through Dp2And Dp3All currents of are ipThe rectifier passes through the diode D of the second single-phase rectification circuit 6p2、Dp3And a diode D having an output connected in parallel to the first single-phase rectification circuit 5 across the load 8m2、Dm3Together power the load 8;
and a fourth working mode: referring to fig. 6, in this mode, the input voltage-u due to the first single-phase rectification circuit 5 connected in parallel across the load 8mGreater than the voltage across the load 8, diode D in the first single-phase rectification circuit 5m1、Dm4Is conducted and flows through the diode Dm1、Dm4All currents of are imTherefore, the output current of the first single-phase rectification circuit 5 is im(ii) a Voltage u of the primary winding of a transformer 4 with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuit 6pLess than zero, diode D in the second single-phase rectification circuit 6p1、Dp4Is conducted and flows through the diode Dp1、Dp4All currents of are ipThe rectifier passes through a diode D in the second single-phase rectification circuit 6p1、Dp4And a diode D having an output connected in parallel to the first single-phase rectification circuit 5 across the load 8m1、Dm4Together supplying the load 8.
The 36-pulse rectifier of the invention is added with a serial-parallel mixed pulse multiplication circuit on the basis of a serial 12-pulse rectifier. The series-parallel mixed pulse multiplication circuit is composed of a transformer 4 with double secondary windings, a first single-phase rectification circuit 5 and a second single-phase rectification circuit 6, two ends of a primary winding of the transformer 4 with the double secondary windings are respectively connected between the middle point of two groups of three-phase full-bridge rectification circuits and a tap of a balancing reactor 7 with a center tap, and the two secondary windings are respectively connected with the two single-phase rectification circuits; because the phase difference of the output voltages of the two groups of three-phase full-bridge rectification circuits is 30 degrees, the series-parallel mixed pulse wave multiplication circuit has four working modes in each power supply period, and the turn ratio relation of the balance reactor with the double secondary windings when the input current THD is minimum is determined by analyzing the four working modes, so that the purpose of minimizing the input current THD is achieved.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (5)

1. A series 36-pulse rectifier based on a series-parallel hybrid pulse multiplier circuit comprises a phase-shifting transformer (1), a first three-phase full-bridge rectification circuit (2), a second three-phase full-bridge rectification circuit (3), a balance reactor (7) with a center tap, a capacitor C1Capacitor C2A parallel-serial composite pulse wave multiplying circuit; the series-parallel mixed pulse wave multiplying circuit comprises a transformer (4) with double secondary windings, a first single-phase rectifying circuit (5) and a second single-phase rectifying circuit (6), the first single-phase rectifying circuit (5) is connected with a load (8) in parallel, and the second single-phase rectifying circuit (6) is connected with the load (8) in series;
the phase-shifting transformer (1) is used for shifting the phase of three-phase voltage input by a power grid to generate two three-phase voltages with the phase difference of 30 degrees and the same amplitude, and respectively sending the two three-phase voltages generated by the phase-shifting transformer (1) to the first three-phase full-bridge rectification circuit (2) and the second three-phase full-bridge rectification circuit (3);
the first three-phase full-bridge rectification circuit (2) and the second three-phase full-bridge rectification circuit (3) are connected in series, the negative output end of the first three-phase full-bridge rectification circuit (2) and the positive output end of the second three-phase full-bridge rectification circuit (3) are intersected at a point P, the point P is connected with the dotted end of a primary side winding of the transformer (4) with double secondary windings, and the dotted end of the primary side winding of the transformer (4) with the double secondary windings is connected with a center tap of the balance reactor (7) with a center tap;
two ends of a first secondary winding of a transformer (4) with double secondary windings are respectively connected with two input ends of a first single-phase rectification circuit (5), and after a positive output end of the first single-phase rectification circuit (5) is connected with a positive output end of a first three-phase full-bridge rectification circuit (2), the positive output end of the first single-phase rectification circuit serving as a 36-pulse rectifier is connected with a positive input end of a load (8); the positive output end of the first single-phase rectification circuit (5) is also connected with a capacitor C1Is connected with one end of the connecting rod; the negative output end of the first single-phase rectification circuit (5) is connected with the negative output end of the second single-phase rectification circuit (6) and then is used as the negative output end of the 36-pulse rectifier to be connected with the negative input end of the load (8);
two ends of a second secondary winding of the transformer (4) with double secondary windings are respectively connected with two input ends of a second single-phase rectification circuit (6), and a positive output end of the second single-phase rectification circuit (6), a negative output end of a second three-phase full-bridge rectification circuit (3) and a capacitor C2Are connected at the same time;
one end of a balance reactor (7) with a center tap and a capacitor C1Is connected with the other end of the balance reactor (7) with a center tap, and the other end of the balance reactor with a center tap is connected with a capacitor C2The other end of the first and second connecting rods is connected;
the first single-phase rectification circuit (5) comprises a diode Dm1Diode Dm2Diode Dm3And a diode Dm4；
Diode Dm1Anode of (2) and diode Dm2After the cathode of the transformer (4) is connected, one input end of a first single-phase rectifying circuit (5) is connected with one end of a first secondary winding of the transformer with double secondary windings;
diode Dm1Cathode and diode Dm3Is connected as the positive output end of the first single-phase rectification circuit (5);
diode Dm3Anode of (2) and diode Dm4After the cathode of the transformer (4) is connected, the other input end of the first single-phase rectification circuit (5) is connected with the other end of the first secondary winding of the transformer with double secondary windings;
diode Dm2Anode of (2) and diode Dm4After being connected, the anode of the first single-phase rectification circuit (5) is used as the negative output end of the first single-phase rectification circuit;
the second single-phase rectification circuit (6) comprises a diode Dp1Diode Dp2Diode Dp3And a diode Dp4；
Diode Dp1Anode of (2) and diode Dp2After the cathode of the transformer (4) is connected, one input end of a second single-phase rectifying circuit (6) is connected with one end of a second secondary winding of the transformer with double secondary windings;
diode Dp1Cathode and diode Dp3Is connected as the positive output end of a second single-phase rectification circuit (6);
diode Dp3Anode of (2) and diode Dp4After the cathode of the transformer (4) is connected, the other input end of the second single-phase rectifying circuit (6) is connected with the other end of the second secondary winding of the transformer with double secondary windings;
diode Dp2Anode of (2) and diode Dp4After being connected, the anode of the first single-phase rectification circuit is used as the negative output end of the second single-phase rectification circuit (6);
the series-parallel mixed pulse wave multiplying circuit is characterized by comprising four working modes, specifically comprising the following steps:
the first working mode is as follows: due to the input voltage u of the first single-phase rectification circuit (5) connected in parallel across the load (8)mA diode D in the first single-phase rectification circuit (5) which is lower than the voltage across the load (8)m1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, so that the output power of the first single-phase rectification circuit (5)Stream imIs zero; voltage u of primary winding of transformer (4) with double secondary windingsxGreater than zero, input voltage u of the second single-phase rectification circuit (6)pLarger than zero, diode D in the second single-phase rectification circuit (6)p2、Dp3Are conducted and all currents flowing through them are ipThe pulse wave rectifier passes through a diode D in a second single-phase rectification circuit (6)p2、Dp3Supplying power to a load (8);
and a second working mode: due to the input voltage-u of the first single-phase rectification circuit (5) connected in parallel across the load (8)mA diode D in the first single-phase rectification circuit (5) which is lower than the voltage across the load (8)m1、Dm2、Dm3、Dm4Are all reversely biased and flow through Dm1To Dm4Is zero, so that the output current i of the first single-phase rectification circuit (5)mIs zero; voltage u of primary winding of transformer (4) with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuit (6)pLess than zero, diode D in the second single-phase rectification circuit (6)p1、Dp4Is conducted through Dp1And Dp4All currents of are ipThe pulse wave rectifier passes through a diode D in the second single-phase rectification circuit (6)p1、Dp4Supplying power to a load (8);
and a third working mode: in this mode, due to the input voltage u of the first single-phase rectification circuit (5) connected in parallel across the load (8)mGreater than the voltage across the load (8), a diode D in the first single-phase rectification circuit (5)m2、Dm3Is conducted through Dm2And Dm3All currents of are imTherefore, the output current of the first single-phase rectification circuit (5) is im(ii) a Voltage u of primary winding of transformer (4) with double secondary windingsxGreater than zero, input voltage u of the second single-phase rectification circuit (6)pLarger than zero, diode D in the second single-phase rectification circuit (6)p2、Dp3Is conducted through Dp2And Dp3All currents of are ipThe rectifier passes through the diode of the second single-phase rectification circuit (6) Dp2、Dp3And outputA diode D connected in parallel in the first single-phase rectification circuit (5) across the load (8)m2、Dm3Together power a load (8);
and a fourth working mode: in this mode, due to the input voltage-u of the first single-phase rectification circuit (5) connected in parallel across the load (8)mGreater than the voltage across the load (8), a diode D in the first single-phase rectification circuit (5)m1、Dm4Is conducted and flows through the diode Dm1、Dm4All currents of are imTherefore, the output current of the first single-phase rectification circuit (5) is im(ii) a Voltage u of primary winding of transformer (4) with double secondary windingsxLess than zero, input voltage u of the second single-phase rectification circuit (6)pLess than zero, diode D in the second single-phase rectification circuit (6)p1、Dp4Is conducted and flows through the diode Dp1、Dp4All currents of are ipThe rectifier passes through a diode D in the second single-phase rectification circuit (6)p1、Dp4And a diode D in the first single-phase rectification circuit (5) with the output connected in parallel across the load (8)m1、Dm4Together supplying power to the load (8).
2. The series-parallel mixed pulse wave multiplication circuit-based 36-pulse wave rectifier according to claim 1, wherein the first three-phase full-bridge rectification circuit (2) and the second three-phase full-bridge rectification circuit (3) are both rectification circuits implemented by diodes.
3. The series-parallel hybrid pulse wave multiplier circuit-based 36-pulse wave rectifier as claimed in claim 1, wherein the first single-phase rectification circuit (5) and the second single-phase rectification circuit (6) are both implemented by a single-phase full-bridge rectification circuit or a single-phase full-wave rectification circuit.
4. The series-parallel hybrid pulse wave multiplication circuit-based 36-pulse wave rectifier according to claim 1, wherein the number of turns N of the first secondary winding of the transformer (4) with double secondary windings is NmNumber of turns N of its primary windingxRatio of (A to B)m1 is 43; the number of turns N of a second secondary winding of a transformer (4) with double secondary windingspNumber of turns N of its primary windingxThe ratio is 0.652.
5. The series-parallel hybrid pulse multiplier circuit-based 36-pulse rectifier of claim 1, wherein the capacitor C is1And a capacitor C2Have the same capacitance value.
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