CN212305167U - Series-connection type multi-pulse rectifier using direct-current side passive harmonic suppression method - Google Patents
Series-connection type multi-pulse rectifier using direct-current side passive harmonic suppression method Download PDFInfo
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- CN212305167U CN212305167U CN202021637560.5U CN202021637560U CN212305167U CN 212305167 U CN212305167 U CN 212305167U CN 202021637560 U CN202021637560 U CN 202021637560U CN 212305167 U CN212305167 U CN 212305167U
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Abstract
The embodiment of the utility model discloses use many pulse wave rectifiers of tandem type of passive harmonic suppression method of direct current side, including input inductance, phase-shifting transformer, first three-phase full-bridge rectifier circuit, second three-phase full-bridge rectifier circuit, first direct current side electric capacity, second direct current side electric capacity, load, harmonic injection circuit, the harmonic injection circuit comprises a single-phase transformer and a single-phase full-bridge rectifier circuit, and single-phase transformer comprises a primary winding and a secondary winding; the positive pole of the output end of the single-phase full-bridge rectification circuit is connected with the negative pole of the second three-phase full-bridge rectification circuit, and the negative pole of the output end is connected with the negative pole of the load. The utility model discloses use the passive harmonic suppression method of direct current side to restrain the harmonic in rectifier input voltage, the electric current, compare with the rectifier that does not use harmonic injection circuit, input voltage THD value is reduced to 4% by 12%, and rectifier input voltage accords with the IEEE standard, has greatly improved the input power quality of rectifier.
Description
Technical Field
The utility model relates to an electric power technical field especially relates to an use passive harmonic suppression method's of direct current side many pulse wave rectifiers of tandem type.
Background
The multi-pulse rectifier is simple in structure and strong in robustness, and is often used as an interface of a high-power electronic device and an alternating current power grid. However, the rectifier adopts diode rectification, high reliability is obtained, and simultaneously, a large amount of harmonic pollution is also avoided, and in addition, a large amount of harmonic waves are generated due to the asymmetric transformer structure. To solve the above problems, an effective method for suppressing the input current and voltage harmonics of the multi-pulse rectifier is urgently needed.
The step number of the input voltage or current of the multi-pulse rectifier is equal to the pulse number of the output voltage or current, the more the step number of the input voltage or current is, the closer the waveform is to sine, and the less the harmonic content of the voltage or current is; the more the output voltage and current pulse number are, the closer the waveform is to the direct current, and the higher the electric energy quality is.
Therefore, the key to improve the quality of the input and output electric energy of the multi-pulse rectifier is to increase the output voltage and current pulse number of the multi-pulse rectifier. The method for improving the input and output voltage or current pulse number of the multi-pulse rectifier comprises two methods, one method is to increase the number of rectifier bridges connected in series or in parallel by increasing the number of output ends of a phase-shifting transformer and the number of taps of a balance reactor, but when the number of the rectifier bridges is too large, the phase-shifting transformer and the balance reactor are difficult to design and the imbalance phenomenon is serious; the other method is to eliminate some specific times of harmonic waves in the input voltage and current of the rectifier by using a direct current side harmonic wave suppression method, and compared with the method for increasing the number of rectifier bridges, the method has the advantages that the number of the rectifier bridges is small, and the loss is low; compared with the direct current side active harmonic suppression method, the direct current side passive harmonic suppression method injects voltage or current signals with specific frequency and shape into the direct current side of the rectifier by means of the characteristics of the circuit, so that harmonic suppression cost is low and reliability is high.
The utility model discloses an application number 2018104096783, utility model title "use 36 pulse wave rectifiers of tandem type of direct current side mixed voltage harmonic injection method" in the utility model patent, though use direct current side mixed voltage harmonic injection method, its harmonic suppression effect is poor, and the circuit reliability is low, can not satisfy the requirement.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides an use passive harmonic suppression method's of direct current side many pulse wave rectifiers of tandem type to promote harmonic suppression effect, and promote the robustness.
In order to solve the above technical problem, an embodiment of the present invention provides a series multi-pulse rectifier using a direct current side passive harmonic suppression method, including an input inductor, a phase-shifting transformer, a first three-phase full-bridge rectification circuit, a second three-phase full-bridge rectification circuit, a first direct current side capacitor, a second direct current side capacitor, and a load, where the input inductor is composed of three equal inductors; the primary winding of the phase-shifting transformer is connected in a triangular mode, the secondary winding of the phase-shifting transformer is connected in a star angle mode, three taps of the primary winding of the phase-shifting transformer are connected with a three-phase alternating-current power supply through three inductors respectively, and the secondary winding of the phase-shifting transformer is connected with the input ends of a first three-phase full-bridge rectification circuit and a second three-phase full-bridge rectification circuit respectively; the multi-pulse rectifier further comprises a harmonic injection circuit, wherein the harmonic injection circuit consists of a single-phase transformer and a single-phase full-bridge rectification circuit, and the single-phase transformer consists of a primary winding and a secondary winding; one side of a primary winding of the single-phase transformer is connected with the middle points of the two groups of three-phase full-bridge rectification circuits, the other side of the primary winding of the single-phase transformer is connected with the middle points of the first direct-current side capacitor and the second direct-current side capacitor, and a secondary winding of the single-phase transformer is respectively connected with the input end of the single-phase full-bridge rectification circuit; the positive electrode of the output end of the single-phase full-bridge rectifying circuit is connected with the negative electrode of the second three-phase full-bridge rectifying circuit, and the negative electrode of the output end is connected with the negative electrode of the load; the positive electrode of the first direct current side capacitor is connected with the positive electrode of the first three-phase full-bridge rectifying circuit and the positive electrode of the load, and the negative electrode of the first direct current side capacitor is connected with the positive electrode of the second direct current side capacitor and the middle point of the two groups of three-phase full-bridge rectifying circuits; and the negative electrode of the second direct-current side capacitor is connected with the negative electrode of the second three-phase full-bridge rectification circuit.
Furthermore, the phase-shifting transformer is an isolation transformer, and the primary side and the secondary side of the isolation transformer are electrically isolated; the isolation transformer is composed of three core columns, each core column is provided with 3 windings, each winding comprises 1 primary side winding and 2 secondary side windings, the windings are mutually independent, the primary side windings form triangular connection, and the secondary side windings form star connection and angle connection, so that two groups of three-phase voltages with equal size and 30-degree phase difference are generated.
Furthermore, the first three-phase full-bridge rectification circuit and the second three-phase full-bridge rectification circuit both adopt uncontrolled rectification devices.
Furthermore, the first direct current side capacitor and the second direct current side capacitor are two capacitors with equal size.
Further, the single-phase full-bridge rectification circuit is composed of four diodes.
Further, the turn ratio of the single-phase transformer is 1.2: 1.
The utility model has the advantages that: the utility model adopts the secondary winding of the isolation transformer as star connection, which effectively inhibits the 3k subharmonic generated by the rectifier; the utility model discloses a harmonic injection circuit adopts passive harmonic suppression circuit, compares with the active harmonic suppression method of direct current side, and the passive harmonic suppression method of direct current side relies on the characteristic of circuit self to come to pour into the voltage or the current signal of specific frequency, shape into to the direct current side of rectifier, and its harmonic suppression cost is low, and the reliability is high; the rectifier bridge adopted by the utility model is a diode rectifier bridge, does not need complex control, has high reliability and is suitable for high-power occasions; the input inductor adopted by the utility model consists of three millihenry level inductors with equal size, and because the inductor has high impedance to higher current harmonic waves, harmonic components in the input current of the rectifier can be ignored, and the input current is equivalent to a sine wave; the two rectifier bridges adopted by the utility model are connected in series, the output voltage of the rectifier is doubled, and the rectifier is suitable for high-voltage occasions; the utility model discloses the output electric capacity that adopts is big electric capacity, because the steady voltage effect of big electric capacity, rectifier output voltage maintains invariable.
Drawings
Fig. 1 is a circuit diagram of a series multi-pulse rectifier using a dc-side passive harmonic suppression method according to an embodiment of the present invention.
Fig. 2 is a structural diagram of an isolation transformer winding according to an embodiment of the present invention.
Fig. 3 is a single-phase transformer winding structure diagram according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of the harmonic injection circuit operating mode I according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of the harmonic injection circuit operating mode II according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of the harmonic injection circuit operating mode III according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1 to 6, a series multi-pulse rectifier using a dc-side passive harmonic suppression method according to an embodiment of the present invention includes an input inductor 1, a phase-shifting transformer 2, a first three-phase full-bridge rectifier circuit 3, a second three-phase full-bridge rectifier circuit 4, a harmonic injection circuit 5, a first dc-side capacitor 6, a second dc-side capacitor 7, and a load 8.
The input inductor 1 is composed of three millihenry level inductors with the same size, harmonic components in input current of the rectifier can be ignored due to high impedance of the inductors to high-order current harmonics, the input current is equivalent to a sine wave, the left sides of the three input inductors are respectively connected with a three-phase alternating current power supply, and the right sides of the three input inductors are respectively connected with three taps of a primary winding of the isolation transformer.
The primary winding of the phase-shifting transformer 2 is connected in a triangular mode, the secondary winding of the phase-shifting transformer is connected in a star angle mode, three taps of the primary winding are connected with the right ends of three input inductors respectively, and the secondary winding of the phase-shifting transformer is connected with the input ends of two groups of three-phase full-bridge rectifying circuits respectively.
The first three-phase full-bridge rectification circuit 3 and the second three-phase full-bridge rectification circuit 4 are connected in series and connected in parallel with two direct-current side capacitors, and the output voltage of the rectifier is doubled. The harmonic injection circuit 5 is composed of a single-phase transformer and a single-phase full-bridge rectification circuit, the single-phase transformer is composed of a primary winding and a secondary winding, the left side of the primary winding is connected with the middle points of the two groups of three-phase full-bridge rectification circuits, the right side of the primary winding is connected with the middle points of the two direct-current side capacitors, the secondary winding is respectively connected with the input end of the single-phase full-bridge rectification circuit, the positive electrode of the output end of the single-phase full-bridge rectification circuit is connected with the negative electrode of the second three-phase full-. The utility model discloses a two sets of three-phase full-bridge rectifier circuit commutations have reduced rectifier device's use amount in the main circuit, have reduced the circuit loss.
The first direct current side capacitor 6 and the second direct current side capacitor 7 are connected in series, the positive pole of the capacitor 6 is connected with the positive pole of the first three-phase full-bridge rectifying circuit 3 and the positive pole of the load 8, the negative pole of the capacitor 6 is connected with the positive pole of the capacitor 7 and the middle points of the two groups of three-phase full-bridge rectifying circuits, and the negative pole of the capacitor 7 is connected with the negative pole of the second three-phase full-bridge rectifying circuit 4.
The utility model discloses use passive harmonic suppression method's of direct current side principle that tandem type multipulse rectifier restraines the harmonic is: difference value of currents of two groups of three-phase full-bridge rectifying circuitsi xThe frequency of the triangular wave is 6 times frequency,i xafter flowing through the single-phase transformer, the primary winding of the single-phase transformer generates an injection voltage of 6 times frequency 3 step waves, and modulates the output voltage of the three-phase full-bridge rectification circuit, so that harmonic waves in the input voltage and current of the rectifier are eliminated.
The utility model adopts two three-phase diode rectifier bridges for rectification, thereby reducing the using amount of rectifier devices in the main circuit and reducing the circuit loss; the direct current side can achieve similar harmonic suppression effect only by using one group of harmonic injection circuits, and the size and the cost of the circuit are effectively reduced.
As an implementation manner, please refer to fig. 1 and 2, the series multi-pulse rectifier using the dc side passive harmonic suppression method of the present invention has an isolation transformer 2 composed of 3 identical core columns, each core column has 3 windings, including 1 primary winding and 2 secondary windings, and the turn ratio of the 3 windings isN 1:N 2:N 3=1.73:1.73: 1; winding a1、a2、a3On the same core column, winding b1、b2、b3On the same core column, winding c1、c2、c3Are positioned on the same core column; primary winding a1、b1、c1Form a triangular connection, and the positive ends of the triangular connection are respectively connected with point A, B, C; secondary winding a2、b2、c2Form a triangular connection and are connected with a first single-phase full-bridge rectification circuit 3; secondary winding a3、b3、c3Form a star connection and are connected with a second single-phase full-bridge rectifying circuit. The primary windings of the isolation transformer form a triangle connection, which is helpful to improve the output power, and the secondary windings form a star connection and an angle connection, which generate two groups of three-phase voltages with equal size and 30-degree phase difference。
The embodiment adopts the isolated transformer, and the primary side and the secondary side of the transformer are electrically isolated, so that the transformer has higher safety.
As an implementation mode, please refer to fig. 1, fig. 3, the utility model discloses an use the transformer that the passive harmonic suppression method of direct current side's tandem type multipulse rectifier pours into is single-phase transformer, single-phase transformer comprises 1 stem, there are 2 windings on the stem, a primary winding and a secondary winding, the input left side of single-phase transformer is connected to on the tie point F of rectifier bridge (being the mid point of two sets of three-phase full-bridge rectifier circuits), the input right side of injection transformer is connected to the tie point P point of two direct current side electric capacity, the secondary winding of single-phase transformer is connected to the input of single-phase full-bridge rectifier circuit, single-phase transformer and single-phase full-bridge rectifier circuit constitute the.
The single-phase transformer adopted by the embodiment has the advantages of simple structure, small capacity and low harmonic suppression cost.
As an embodiment, referring to fig. 1, 4, 5, and 6, the harmonic injection circuit 5 of the series multi-pulse rectifier using the dc side passive harmonic suppression method of the present invention has the following operation modes:
the harmonic injection circuit 5 is composed of a single-phase transformer and a single-phase full-bridge rectification circuit, and can be known according to the structure of the transformer and the conduction mode of the rectification bridgei xA triangular wave 6 times the power supply frequency; when in usei x>At 0, diode D1、D4Conducting, diode D2、D3The power is turned off and the power is turned off,u FP>0, the working mode I of the harmonic injection circuit 5 is shown in FIG. 4; when in usei x<At 0, diode D2、D3Conducting, diode D1、D4The power is turned off and the power is turned off,u FP<0, the working mode II of the harmonic injection circuit 5 is shown in FIG. 5; when in usei xClose to 0, diode D1、D2、D3、D4All the components are conducted, and the power supply is turned on,u FP=0, the harmonic injection circuit 5 operates in the mode III shown in fig. 6.
The utility model discloses a harmonic injection circuit 5 is current type harmonic injection circuit, improves the input power quality of rectifier through injecting into the electric current harmonic to rectifier direct current side, and harmonic injection circuit 5 harmonic suppression is effectual to have stronger robustness.
The utility model discloses a harmonic injection circuit 5's rectification side links to each other with load 8 and the negative pole of second three-phase full-bridge rectifier circuit 4 respectively, and load 8 electric currents provide the energy for harmonic injection circuit 5, the utility model discloses a 5 robustness of harmonic injection circuit is stronger.
The utility model discloses a harmonic injection circuit 5's capacity only is 2.8% of whole rectifier input power, and the loss is low.
As an embodiment, referring to fig. 1, 4, 5 and 6, the turn ratio of the single-phase transformer of the series multi-pulse rectifier using the dc side passive harmonic suppression method of the present invention isN 4/N 5=1.2:1。
In one embodiment, the first three-phase full-bridge rectification circuit 3 and the second three-phase full-bridge rectification circuit 4 both use uncontrolled rectification devices, and reliability is high.
In one embodiment, the first dc-side capacitor 6 and the second dc-side capacitor 7 are two large capacitors with the same size, and the rectifier output voltage is filtered by the first dc-side capacitor 6 and the second dc-side capacitor 7 to be dc.
As an embodiment, the single-phase full-bridge rectification circuit is composed of four diodes (i.e. diode D in FIG. 1)1、D2、D3、D4) The single-phase full-bridge rectification circuit has the advantages of small current flowing through the single-phase full-bridge rectification circuit, small loss and high reliability.
The utility model discloses use the passive harmonic suppression method of direct current side to restrain the harmonic in rectifier input voltage, the electric current, compare with the rectifier that does not use harmonic injection circuit, input voltage THD value is reduced to 4% by 12%, and rectifier input voltage accords with IEEE519-1992 standard, has greatly improved the input power quality of rectifier.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A series-connection multi-pulse rectifier using a direct current side passive harmonic suppression method comprises an input inductor, a phase-shifting transformer, a first three-phase full-bridge rectification circuit, a second three-phase full-bridge rectification circuit, a first direct current side capacitor, a second direct current side capacitor and a load, wherein the input inductor consists of three inductors with the same size; the primary winding of the phase-shifting transformer is connected in a triangular mode, the secondary winding of the phase-shifting transformer is connected in a star angle mode, three taps of the primary winding of the phase-shifting transformer are connected with a three-phase alternating-current power supply through three inductors respectively, and the secondary winding of the phase-shifting transformer is connected with the input ends of a first three-phase full-bridge rectification circuit and a second three-phase full-bridge rectification circuit respectively; the multi-pulse-wave rectifier is characterized by further comprising a harmonic injection circuit, wherein the harmonic injection circuit consists of a single-phase transformer and a single-phase full-bridge rectification circuit, and the single-phase transformer consists of a primary winding and a secondary winding; one side of a primary winding of the single-phase transformer is connected with the middle points of the two groups of three-phase full-bridge rectification circuits, the other side of the primary winding of the single-phase transformer is connected with the middle points of the first direct-current side capacitor and the second direct-current side capacitor, and a secondary winding of the single-phase transformer is respectively connected with the input end of the single-phase full-bridge rectification circuit; the positive electrode of the output end of the single-phase full-bridge rectifying circuit is connected with the negative electrode of the second three-phase full-bridge rectifying circuit, and the negative electrode of the output end is connected with the negative electrode of the load; the positive electrode of the first direct current side capacitor is connected with the positive electrode of the first three-phase full-bridge rectifying circuit and the positive electrode of the load, and the negative electrode of the first direct current side capacitor is connected with the positive electrode of the second direct current side capacitor and the middle point of the two groups of three-phase full-bridge rectifying circuits; and the negative electrode of the second direct-current side capacitor is connected with the negative electrode of the second three-phase full-bridge rectification circuit.
2. The series multi-pulse rectifier using the dc-side passive harmonic suppression method according to claim 1, wherein the phase-shifting transformer is an isolation transformer, and the primary and secondary sides of the isolation transformer are electrically isolated; the isolation transformer is composed of three core columns, each core column is provided with 3 windings, each winding comprises 1 primary side winding and 2 secondary side windings, the windings are mutually independent, the primary side windings form triangular connection, and the secondary side windings form star connection and angle connection, so that two groups of three-phase voltages with equal size and 30-degree phase difference are generated.
3. The series-type multipulse rectifier using dc-side passive harmonic suppression method according to claim 1, wherein the first three-phase full-bridge rectifier circuit and the second three-phase full-bridge rectifier circuit each employ an uncontrolled rectifier device.
4. The series multi-pulse rectifier using the dc-side passive harmonic suppression method as claimed in claim 1, wherein the first dc-side capacitor and the second dc-side capacitor are two capacitors of equal size.
5. The series multi-pulse rectifier using dc-side passive harmonic suppression as claimed in claim 1 wherein the single-phase full-bridge rectifier circuit is comprised of four diodes.
6. The series multi-pulse rectifier using the dc-side passive harmonic suppression method according to claim 1, wherein a turn ratio of the single-phase transformer is 1.2: 1.
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Address after: 518000 floor a401, 4-13, building a, Sino German European Industrial Demonstration Park, Hangcheng Avenue, guxing community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Growatt New Energy Technology Co.,Ltd. Address before: 518000 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. |