CN203722504U - N-output three-phase 3N+3 switch group MMC inverter - Google Patents

N-output three-phase 3N+3 switch group MMC inverter Download PDF

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CN203722504U
CN203722504U CN201420056637.8U CN201420056637U CN203722504U CN 203722504 U CN203722504 U CN 203722504U CN 201420056637 U CN201420056637 U CN 201420056637U CN 203722504 U CN203722504 U CN 203722504U
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brachium pontis
switches set
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张波
付坚
丘东元
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South China University of Technology SCUT
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Abstract

本实用新型提供N输出三相3N+3开关组MMC逆变器。逆变器包括直流电源、第一桥臂、第二桥臂、第三桥臂、N个三相负载;所述三个桥臂均由N+1个开关组和2个电感串联而成,每个桥臂的每个开关组由n个功率开关单元串联而成;第k个三相负载的三端分别与三个桥臂的第k+1个开关组的上端连接,其中k的取值为1~N-1;第N个三相负载的三端分别与三个桥臂的第N个开关组的下端连接。该逆变器采用载波移相PWM控制,具有N路线电压为2n+1电平的三相交流输出,MMC功率开关单元中每个开关管承受的电压应力仅为直流电源电压的1/n,适合于高压、大功率、三相交流双负载的场合。

The utility model provides an N-output three-phase 3N+3 switch group MMC inverter. The inverter includes a DC power supply, a first bridge arm, a second bridge arm, a third bridge arm, and N three-phase loads; the three bridge arms are all composed of N+1 switch groups and 2 inductors connected in series, Each switch group of each bridge arm is composed of n power switch units in series; the three terminals of the kth three-phase load are respectively connected to the upper ends of the k+1th switch group of the three bridge arms, where k is taken as The value is 1~N-1; the three terminals of the Nth three-phase load are respectively connected to the lower ends of the Nth switch group of the three bridge arms. The inverter adopts carrier phase-shift PWM control, and has a three-phase AC output with N line voltage of 2n+1 level. The voltage stress of each switch tube in the MMC power switch unit is only 1/n of the DC power supply voltage. Suitable for high voltage, high power, three-phase AC dual load occasions.

Description

N输出三相3N+3开关组MMC逆变器N output three-phase 3N+3 switch group MMC inverter

技术领域technical field

本实用新型涉及模块组合多电平(MMC)变换器领域,具体涉及一种N输出三相3N+3开关组MMC逆变器。The utility model relates to the field of module combined multilevel (MMC) converters, in particular to an N output three-phase 3N+3 switch group MMC inverter.

背景技术Background technique

目前功率变换器正向小型化、高可靠性和低损耗方向发展,在这种趋势下出现两种改进变换器的方向:减少无源器件或者改进变换器拓扑结构以减少有源器件作为减少有源器件方向的新进展。三相3N+3开关变换器相对于传统的6N开关变换器减少了3N-3个开关及相应的驱动电路,在考虑成本与体积的应用中占有一定的优势。然而,3N+3开关变换器的N路单相输出均为两电平,输出交流波形比较差。此外,3N+3个开关中每个开关承受的电压应力为直流母线电压的一半,且存在3N+3个开关管的均压问题,这极大的限制了三相3N+3开关变换器在高压和大功率场合的应用。At present, power converters are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two directions for improving the converter: reducing passive components or improving the topology of the converter to reduce active components. New progress in the direction of source devices. Compared with the traditional 6N switching converter, the three-phase 3N+3 switching converter reduces 3N-3 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, the N single-phase outputs of the 3N+3 switching converter are all two-level, and the output AC waveform is relatively poor. In addition, the voltage stress of each switch in the 3N+3 switches is half of the DC bus voltage, and there is a voltage equalization problem among the 3N+3 switches, which greatly limits the three-phase 3N+3 switching converter in Applications in high voltage and high power occasions.

近年来,多电平变换技术得到不断推广,并已成功应用在诸如高压直流输电、电力传动、有源滤波、静止同步补偿等工业领域,目前常见的电压型多电平变换器拓扑大致可分为箱位型和单元级联型两大类。模块组合多电平变换器(Modular Multilevel Converter,MMC)作为一种新型的多电平拓扑,除了具有传统多电平变换器的优点,模块组合多电平变换器采用模块化结构设计,便于系统扩容和冗余工作;具有不平衡运行能力、故障穿越和恢复能力,系统可靠性高;由于具有公共直流母线,模块组合多电平变换器尤其适用于高压直流输电系统应用。然而,当N条不同频率的三相交流线路的相连时,需要2N个MMC变换器,这极大的增加了工程成本。In recent years, multi-level conversion technology has been continuously promoted, and has been successfully applied in industrial fields such as high-voltage direct current transmission, power transmission, active filtering, and static synchronous compensation. The current common topology of voltage-type multi-level converters can be roughly divided into There are two types of box type and unit cascade type. Modular Multilevel Converter (MMC) is a new type of multilevel topology. In addition to the advantages of traditional multilevel converters, the modular multilevel converter adopts a modular structure design, which is convenient for the system Capacity expansion and redundant work; with unbalanced operation capability, fault ride-through and recovery capability, high system reliability; due to the common DC bus, the module combined multilevel converter is especially suitable for high-voltage direct current transmission system applications. However, when N three-phase AC lines with different frequencies are connected, 2N MMC converters are needed, which greatly increases the engineering cost.

实用新型内容Utility model content

本实用新型的目的在于克服上述现有技术的不足,提出一种N输出三相3N+3开关组MMC逆变器。The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art, and propose an N-output three-phase 3N+3 switch group MMC inverter.

本实用新型的目的通过如下技术方案实现。The purpose of this utility model is achieved through the following technical solutions.

N输出三相3N+3开关组MMC逆变器包括直流电源、第一桥臂、第二桥臂、第三桥臂、N个三相负载;所述第一桥臂由N+1个开关组和2个电感串联而成,所述第二桥臂由N+1个开关组和2个电感串联而成,所述第三桥臂由N+1个开关组和2个电感串联而成;第一桥臂的第i个开关组由n个功率开关单元串联而成,第二桥臂的第i个开关组由n个功率开关单元串联而成,第三桥臂的第i个开关组由n个功率开关单元串联而成,其中i的取值为1~N+1;第k个三相负载的三端分别与第一桥臂的第k+1个开关组的上端、第二桥臂的第k+1个开关组的上端、第三桥臂的第k+1个开关组的上端连接,其中k的取值为1~N-1;第N个三相负载的三端分别与第一桥臂的第N个开关组的下端、第二桥臂的第N个开关组的下端、第三桥臂的第N个开关组的下端连接;第k个负载的三端作为第k路三相输出,其中k的取值为1~N,N>2,n为正整数。N output three-phase 3N+3 switch group MMC inverter includes a DC power supply, a first bridge arm, a second bridge arm, a third bridge arm, and N three-phase loads; the first bridge arm is composed of N+1 switches group and 2 inductors in series, the second bridge arm is composed of N+1 switch groups and 2 inductors in series, and the third bridge arm is composed of N+1 switch groups and 2 inductors in series ; The i-th switch group of the first bridge arm is composed of n power switch units in series, the i-th switch group of the second bridge arm is formed of n power switch units in series, the i-th switch of the third bridge arm The group consists of n power switch units in series, where the value of i is 1 to N+1; the three terminals of the kth three-phase load are respectively connected to the upper end of the k+1th switch group of the first bridge arm, the The upper end of the k+1th switch group of the second bridge arm is connected to the upper end of the k+1th switch group of the third bridge arm, where the value of k is 1 to N-1; the three-phase load of the Nth three-phase load The terminals are respectively connected to the lower end of the Nth switch group of the first bridge arm, the lower end of the Nth switch group of the second bridge arm, and the lower end of the Nth switch group of the third bridge arm; the three terminals of the kth load As the k-th three-phase output, where k ranges from 1 to N, N>2, and n is a positive integer.

上述的N输出三相3N+3开关组MMC逆变器中,第一桥臂的两个电感相互耦合,构成一对耦合电感;第二桥臂的两个电感相互耦合,构成一对耦合电感;第三桥臂的两个电感相互耦合,构成一对耦合电感。In the above-mentioned N-output three-phase 3N+3 switch group MMC inverter, the two inductors of the first bridge arm are coupled to each other to form a pair of coupled inductors; the two inductors of the second bridge arm are coupled to each other to form a pair of coupled inductors ; The two inductors of the third bridge arm are coupled with each other to form a pair of coupled inductors.

上述的N输出三相3N+3开关组MMC逆变器中,直流电源的正极与第一桥臂的第1个开关组的上端、第二桥臂的第1个开关组的上端、第三桥臂的第1个开关组的上端连接;第一桥臂的第1个开关组的下端与第一桥臂的第1个电感的一端连接,第一桥臂的第1个电感的另一端与第一桥臂的第2个开关组的上端连接;第一桥臂的第i个开关组的下端与第一桥臂的第i+1个开关组的上端连接,其中i的取值为2~N-1;第一桥臂的第N个开关组的下端与第一桥臂的第2个电感的一端连接,第一桥臂的第2个电感的另一端与第一桥臂的第N+1个开关组的上端连接;第二桥臂的电路结构、第三桥臂的电路结构与第一桥臂的电路结构完全一致;第k个三相负载的三端分别与第一桥臂的第k+1个开关组的上端、第二桥臂的第k+1个开关组的上端、第三桥臂的第k+1个开关组的上端连接,其中k的取值为1~N-1;第N个三相负载的三端分别与第一桥臂的第N个开关组的下端、第二桥臂的第N个开关组的下端、第三桥臂的第N个开关组的下端连接。In the above-mentioned N output three-phase 3N+3 switch group MMC inverter, the positive pole of the DC power supply is connected to the upper end of the first switch group of the first bridge arm, the upper end of the first switch group of the second bridge arm, and the third The upper end of the first switch group of the bridge arm is connected; the lower end of the first switch group of the first bridge arm is connected with one end of the first inductor of the first bridge arm, and the other end of the first inductor of the first bridge arm It is connected to the upper end of the second switch group of the first bridge arm; the lower end of the i-th switch group of the first bridge arm is connected to the upper end of the i+1th switch group of the first bridge arm, where the value of i is 2~N-1; the lower end of the Nth switch group of the first bridge arm is connected to one end of the second inductance of the first bridge arm, and the other end of the second inductance of the first bridge arm is connected to the The upper end of the N+1th switch group is connected; the circuit structure of the second bridge arm and the circuit structure of the third bridge arm are completely consistent with the circuit structure of the first bridge arm; the three terminals of the kth three-phase load are respectively connected to the first The upper end of the k+1th switch group of the bridge arm, the upper end of the k+1th switch group of the second bridge arm, and the upper end of the k+1th switch group of the third bridge arm are connected, wherein the value of k is 1~N-1; the three terminals of the Nth three-phase load are respectively connected to the lower end of the Nth switch group of the first bridge arm, the lower end of the Nth switch group of the second bridge arm, and the Nth end of the third bridge arm The lower end of a switch group is connected.

上述的N输出三相3N+3开关组MMC逆变器中,功率开关单元由第一开关管、第二开关管、第一二极管、第二二极管和电容构成。其中,电容的正极与第一开关管的集电极、第一二极管的阴极连接,第一开关管的发射极与第一二极管的阳极、第二开关管的集电极、第二二极管的阴极连接,第二开关管的发射极与第二二极管的阳极、电容的负极连接;第二开关管的集电极作为第一输出端,第二开关管的发射极作为第二输出端。In the above-mentioned N-output three-phase 3N+3 switch group MMC inverter, the power switch unit is composed of a first switch tube, a second switch tube, a first diode, a second diode and a capacitor. Wherein, the anode of the capacitor is connected to the collector of the first switch tube and the cathode of the first diode, the emitter of the first switch tube is connected to the anode of the first diode, the collector of the second switch tube, the second two The cathode of the pole tube is connected, the emitter of the second switch tube is connected with the anode of the second diode and the negative pole of the capacitor; the collector of the second switch tube is used as the first output terminal, and the emitter of the second switch tube is used as the second output.

上述的N输出三相3N+3开关组MMC逆变器中,第一桥臂的第i个开关组的第j个功率开关单元的第二输出端与第一桥臂的第i个开关组的第j+1个功率开关单元的第一输出端连接,其中j取值为1~n-1,i取值为1~N+1;第二桥臂的第i个开关组的第j个功率开关单元的第二输出端与第二桥臂的第i个开关组的第j+1个功率开关单元的第一输出端连接;第三桥臂的第i个开关组的第j个功率开关单元的第二输出端与第三桥臂的第i个开关组的第j+1个功率开关单元的第一输出端连接。In the above-mentioned N-output three-phase 3N+3 switch group MMC inverter, the second output terminal of the j-th power switch unit of the i-th switch group of the first bridge arm is connected to the i-th switch group of the first bridge arm The first output terminal of the j+1th power switch unit of the second bridge arm is connected to the first output terminal, where j takes a value from 1 to n-1, and i takes a value from 1 to N+1; the jth of the i-th switch group of the second bridge arm The second output end of a power switch unit is connected to the first output end of the j+1th power switch unit of the i-th switch group of the second bridge arm; the j-th power switch unit of the i-th switch group of the third bridge arm The second output end of the power switch unit is connected to the first output end of the j+1th power switch unit of the i-th switch group of the third bridge arm.

上述N输出三相3N+3开关组MMC逆变器的控制方法中,采用载波移相PWM控制第一桥臂的每个开关组、第二桥臂的每个开关组和第三桥臂的每个开关组的每个开关管的开通与关断,其中i取值为1~N+1;第一桥臂的第i个开关组的第j个功率开关单元、第二桥臂的第i个开关组的第j个功率开关单元和第三桥臂的第i个开关组的第j个功率开关单元均采用相同三角波作为第j个载波Cj,其中j的取值为1~n;n个载波依次滞后相角360°/n;第k个负载的第一桥臂的端采用第一桥臂的第k个正弦波RLuk叠加第k个直流偏置Rdok得到第一桥臂的第k个调制波RLuk+Rdok,其中k的取值为1~N;第k个负载的第二桥臂的端采用第二桥臂的第k个正弦波RLvk叠加第k个直流偏置Rdok得到第二桥臂的第k个调制波RLvk+Rdok;第k个负载的第三桥臂的端采用第三桥臂的第k个正弦波RLwk叠加第k个直流偏置Rdok得到第三桥臂的第k个调制波RLwk+Rdok;第一桥臂的第k个正弦波RLuk、第二桥臂的第k个正弦波RLvk和第三桥臂的第k个正弦波RLwk相位依次相差120°In the control method of the above-mentioned N output three-phase 3N+3 switch group MMC inverter, each switch group of the first bridge arm, each switch group of the second bridge arm and each switch group of the third bridge arm are controlled by carrier phase-shift PWM. The turn-on and turn-off of each switch tube of each switch group, where the value of i is 1 to N+1; the j-th power switch unit of the i-th switch group of the first bridge arm, the j-th power switch unit of the second bridge arm Both the j-th power switch unit of the i-th switch group and the j-th power switch unit of the i-th switch group of the third bridge arm use the same triangular wave as the j-th carrier C j , where the value of j is 1~n ; The phase angle of n carrier waves lags by 360°/n in turn; the end of the first bridge arm of the kth load adopts the kth sine wave R Luk of the first bridge arm to superimpose the kth DC offset R dok to obtain the first bridge The kth modulation wave R Luk +R dok of the arm, where the value of k is 1 to N; the end of the second bridge arm of the kth load adopts the kth sine wave R Lvk of the second bridge arm to superimpose the kth The kth modulation wave R Lvk +R dok of the second bridge arm is obtained by a DC bias R dok ; the end of the third bridge arm of the kth load adopts the kth sine wave R Lwk of the third bridge arm to superimpose the kth The kth modulation wave R Lwk +R dok of the third bridge arm is obtained by a DC bias R dok ; the kth sine wave R Luk of the first bridge arm, the kth sine wave R Lvk of the second bridge arm and the The phases of the kth sine wave R Lwk of the three bridge arms are sequentially different by 120 ° .

上述控制方法中,第一桥臂的第k个调制波RLuk+Rdok与第j个载波Cj通过第k个比较器,当第一桥臂的第k个调制波RLuk+Rdok大于第j个载波Cj时,第k个比较器输出高电平,当第一桥臂的第k个调制波RLuk+Rdok小于第j个载波Cj时,第k个比较器输出低电平,其中k的取值为1~N;第1个比较器的输出作为第一桥臂的第1个开关组的第j个功率开关单元的第二开关管门极的控制电平;第k-1个比较器的输出通过第k-1个非门,第k-1个非门的输出与第k个比较器的输出通过第k-1个异或门得到第一桥臂的第k个开关组的第j个功率开关单元的第二开关管门极的控制电平,其中k的取值为2~N;第N个比较器的输出通过第N个非门得到第一桥臂的第N+1个开关组的第j个功率开关单元的第二开关管门极的控制电平;第二桥臂的第k个调制波RLvk+Rdok与第j个载波Cj通过第N+k个比较器,当第二桥臂的第k个调制波RLvk+Rdok大于第j个载波Cj时,第N+k个比较器输出高电平,当第二桥臂的第k个调制波RLvk+Rdok小于第j个载波Cj时,第N+k个比较器输出低电平,其中k的取值为1~N;第N+1个比较器的输出作为第二桥臂的第1个开关组的第j个功率开关单元的第二开关管门极的控制电平;第N+k-1个比较器的输出通过第N+k-1个非门,第N+k-1个非门的输出与第N+k个比较器的输出通过第N-1+k-1个异或门得到第二桥臂的第k个开关组的第j个功率开关单元的第二开关管门极的控制电平,其中k的取值为2~N;第2*N个比较器的输出通过第2*N个非门得到第二桥臂的第N+1个开关组的第j个功率开关单元的第二开关管门极的控制电平;第三桥臂的第k个调制波RLwk+Rdok与第j个载波Cj通过第2*N+k个比较器,当第三桥臂的第k个调制波RLwk+Rdok大于第j个载波Cj时,第2*N+k个比较器输出高电平,当第三桥臂的第k个调制波RLwk+Rdok小于第j个载波Cj时,第2*N+k个比较器输出低电平,其中k的取值为1~N;第2*N+1个比较器的输出作为第三桥臂的第1个开关组的第j个功率开关单元的第二开关管门极的控制电平;第2*N+k-1个比较器的输出通过第2*N+k-1个非门,第2*N+k-1个非门的输出与第2*N+k个比较器的输出通过第2*(N-1)+k-1个异或门得到第三桥臂的第k个开关组的第j个功率开关单元的第二开关管门极的控制电平,其中k的取值为2~N;第3*N个比较器的输出通过第3*N个非门得到第三桥臂的第N+1个开关组的第j个功率开关单元的第二开关管门极的控制电平。In the above control method, the kth modulation wave R Luk + R dok of the first bridge arm and the jth carrier C j pass through the kth comparator, when the kth modulation wave R Luk + R dok of the first bridge arm When it is greater than the j-th carrier C j , the k-th comparator outputs a high level, and when the k-th modulation wave R Luk + R dok of the first bridge arm is smaller than the j-th carrier C j , the k-th comparator outputs Low level, where the value of k is 1 to N; the output of the first comparator is used as the control level of the second switch gate of the jth power switch unit of the first switch group of the first bridge arm ;The output of the k-1th comparator passes through the k-1th NOT gate, and the output of the k-1th NOT gate and the output of the kth comparator pass through the k-1th XOR gate to obtain the first bridge arm The control level of the second switch gate of the jth power switch unit of the kth switch group, where the value of k is 2 to N; the output of the Nth comparator is obtained through the Nth NOT gate The control level of the second switch gate of the jth power switch unit of the N+1th switch group of a bridge arm; the kth modulation wave R Lvk +R dok of the second bridge arm and the jth carrier wave C j passes through the N+kth comparator, when the kth modulation wave R Lvk +R dok of the second bridge arm is greater than the jth carrier C j , the N+kth comparator outputs a high level, when the When the kth modulation wave R Lvk +R dok of the second bridge arm is smaller than the jth carrier C j , the N+kth comparator outputs a low level, where the value of k is 1 to N; the N+1th The output of the comparator is used as the control level of the second switch gate of the jth power switch unit of the first switch group of the second bridge arm; the output of the N+k-1th comparator is passed through the N+kth -1 NOT gate, the output of the N+k-1th NOT gate and the output of the N+kth comparator pass through the N-1+k-1th XOR gate to get the kth switch of the second bridge arm The control level of the gate of the second switching tube of the jth power switching unit in the group, where the value of k is 2 to N; the output of the 2*Nth comparator is obtained through the 2*Nth NOT gate to obtain the second The control level of the second switch gate of the jth power switch unit of the N+1th switch group of the bridge arm; the kth modulation wave R Lwk +R dok of the third bridge arm and the jth carrier C j passes through the 2*N+k comparator, when the kth modulation wave R Lwk +R dok of the third bridge arm is greater than the jth carrier C j , the 2*N+k comparator outputs a high level , when the kth modulation wave R Lwk +R dok of the third bridge arm is smaller than the jth carrier C j , the 2*N+kth comparator outputs a low level, where the value of k is 1 to N; The output of the 2*N+1th comparator is used as the control level of the second switch gate of the jth power switch unit of the first switch group of the third bridge arm; the 2*N+k-1th The output of the comparator passes through the 2*N+k-1 NOT gate, the output of the 2*N+k-1 NOT gate and the output of the 2*N+k comparator pass through the 2* (N-1)+k-1 XOR gates to obtain the control level of the second switch gate of the j-th power switch unit of the k-th switch group of the third bridge arm, wherein the value of k is 2 ~N; the output of the 3*Nth comparator is passed through the 3*Nth NOT gate to obtain the control voltage of the second switch gate of the jth power switch unit of the N+1th switch group of the third bridge arm flat.

工作模式包括同频工作模式(CF模式)和异频工作模式(DF模式),CF模式中,N路三相输出的频率相同,幅值不相同;DF模式中,N路三相输出的频率和幅值均不同。The working modes include the same frequency working mode (CF mode) and different frequency working mode (DF mode). In CF mode, the frequency of N-way three-phase output is the same, but the amplitude is different; in DF mode, the frequency of N-way three-phase output and amplitudes are different.

与现有技术相比,本实用新型具有的优势为:具有N路线电压为2n+1电平的交流输出,输出电流波形质量很高,功率开关单元中每个开关管承受的电压应力仅为直流母线电压的1/n,同时能保证变换器工作过程中所有开关管承受的电压相等,很好的解决了开关管的均压问题。与现有的三相3N+3开关变换器相比较,本实用新型所提供的N输出三相3N+3开关组MMC逆变器的N路输出均为2n+1电平线电压的交流输出,输出交流波形的质量有了极大的提高。此外,每个开关管的承受的电压应力仅为直流母线电压的1/n,且本实用新型所提供的控制方法使变换器工作过程中所有开关管承受的电压相等,很好的解决了开关管的均压问题,这将非常有利于N输出三相3N+3开关组MMC逆变器在高压和大功率场合的应用。与现有的MMC变换器相比较,本实用新型所提供的N输出三相3N+3开关组MMC逆变器具有N路三相交流输出,可直接用于N条不同频率的三相交流线路的相连,极大的降低了工程成本。Compared with the prior art, the utility model has the advantages that: it has an AC output with an N line voltage of 2n+1 level, the output current waveform quality is very high, and the voltage stress that each switch tube in the power switch unit bears is only 1/n of the DC bus voltage, and at the same time, it can ensure that the voltages of all switching tubes are equal during the working process of the converter, which solves the problem of voltage equalization of the switching tubes. Compared with the existing three-phase 3N+3 switching converter, the N-way outputs of the N-output three-phase 3N+3 switch group MMC inverter provided by the utility model are all AC outputs of 2n+1 level line voltage , the quality of the output AC waveform has been greatly improved. In addition, the voltage stress of each switching tube is only 1/n of the DC bus voltage, and the control method provided by the utility model makes the voltages of all switching tubes equal during the working process of the converter, which solves the problem of switching This will be very beneficial to the application of N-output three-phase 3N+3 switch group MMC inverters in high-voltage and high-power occasions. Compared with the existing MMC converter, the N output three-phase 3N+3 switch group MMC inverter provided by the utility model has N three-phase AC outputs, which can be directly used for N three-phase AC lines with different frequencies connection, which greatly reduces the engineering cost.

附图说明Description of drawings

图1是本实用新型的N输出三相3N+3开关组MMC逆变器的电路结构图;Fig. 1 is the circuit structural diagram of N output three-phase 3N+3 switch group MMC inverter of the present utility model;

图2是图1所示的N输出三相3N+3开关组MMC逆变器的开关功率单元的电路结构图;Fig. 2 is a circuit structure diagram of the switching power unit of the N output three-phase 3N+3 switch group MMC inverter shown in Fig. 1;

图3a~图3c是图1所示的N输出三相3N+3开关组MMC逆变器的载波移相PWM控制结构图;Figures 3a to 3c are the carrier phase-shift PWM control structure diagrams of the N-output three-phase 3N+3 switch group MMC inverter shown in Figure 1;

图4a、4b是三输出三相十二开关组九电平MMC逆变器分别工作于CF模式和DF模式下的调制波;Figures 4a and 4b are the modulation waves of the three-output three-phase twelve-switch group nine-level MMC inverter working in CF mode and DF mode respectively;

图5a1、图5a2、图5a3、图5b1、图5b2、图5b3是三输出三相十二开关组九电平MMC逆变器工作于CF模式和DF模式的仿真波形图。Fig. 5a1, Fig. 5a2, Fig. 5a3, Fig. 5b1, Fig. 5b2, Fig. 5b3 are simulation waveform diagrams of three-output three-phase twelve-switch group nine-level MMC inverter working in CF mode and DF mode.

具体实施方式Detailed ways

为进一步阐述本实用新型的内容和特点,以下结合附图对本实用新型的具体实施方案进行具体说明。但本实用新型的实施不限于此。In order to further illustrate the content and characteristics of the utility model, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings. But the implementation of the present utility model is not limited thereto.

参考图1,本实用新型的N输出三相3N+3开关组MMC逆变器,包括直流电源Udc、第一桥臂、第二桥臂、第三桥臂、N个三相负载;所述第一桥臂由N+1个开关组(Bu1、Bu2、…、Bu(N+1))和2个电感(Lu1、Lu2)串联而成,所述第二桥臂由N+1个开关组(Bv1、Bv2、…、Bv(N+1))和2个电感(Lv1、Lv2)串联而成,所述第三桥臂由N+1个开关组(Bw1、Bw2、…、Bw(N+1))和2个电感(Lw1、Lw2)串联而成;第一桥臂的第i个开关组Bui由n个功率开关单元(SMBui1、SMBui2、…、SMBuin)串联而成,第二桥臂的第i个开关组Bvi由n个功率开关单元(SMBvi1、SMBvi2、…、SMBvin)串联而成,第三桥臂的第i个开关组Bwi由n个功率开关单元(SMBwi1、SMBwi2、…、SMBwin)串联而成,其中i的取值为1~N+1;第k个三相负载的三端分别与第一桥臂的第k+1个开关组Bu(k+1)的上端o、第二桥臂的第k+1个开关组Bv(k+1)的上端o、第三桥臂的第k+1个开关组Bw(k+1)的上端o连接,其中k的取值为1~N-1;第N个三相负载的三端分别与第一桥臂的第N个开关组BuN的下端p、第二桥臂的第N个开关组BvN的下端p、第三桥臂的第N个开关组BwN的下端p连接;第k个负载的三端作为第k路三相输出,其中k的取值为1~N。Referring to Fig. 1, the N output three-phase 3N+3 switch group MMC inverter of the present invention includes a DC power supply U dc , a first bridge arm, a second bridge arm, a third bridge arm, and N three-phase loads; The first bridge arm is composed of N+1 switch groups (B u1 , B u2 , ..., Bu(N+1) ) and two inductors (L u1 , L u2 ) connected in series, and the second bridge arm It is composed of N+1 switch groups (B v1 , B v2 ,..., B v(N+1 )) and 2 inductors (Lv1, Lv2) in series, and the third bridge arm is composed of N+1 switch groups (B w1 , B w2 ,..., B w(N+1) ) and two inductors (L w1 , L w2 ) in series; the i-th switch group B ui of the first bridge arm consists of n power switch units (SM Bui1 , SM Bui2 , ..., SM Buin ) are connected in series, and the i-th switch group B vi of the second bridge arm is formed by connecting n power switch units (SM Bvi1 , SM Bvi2 , ..., SM Bvin ) in series, The i-th switch group B wi of the third bridge arm is composed of n power switch units (SM Bwi1 , SM Bwi2 , ..., SM Bwin ) in series, where the value of i is 1 to N+1; the k-th three The three terminals of the phase load are respectively connected to the upper end o of the k+1th switch group B u(k+1) of the first bridge arm, and the upper end o of the k+1th switch group B v(k+1) of the second bridge arm The upper end o is connected to the upper end o of the k+1th switch group B w(k+1) of the third bridge arm, where the value of k is 1 to N-1; the three terminals of the Nth three-phase load are respectively connected to The lower end p of the Nth switch group B uN of the first bridge arm, the lower end p of the Nth switch group B vN of the second bridge arm, and the lower end p of the Nth switch group B wN of the third bridge arm are connected; The three terminals of the k loads are used as the k-th three-phase output, where the value of k is 1 to N.

直流电源Udc的正极与第一桥臂的第1个开关组Bu1的上端o、第二桥臂的第1个开关组Bv1的上端o、第三桥臂的第1个开关组Bw1的上端o连接;第一桥臂的第1个开关组Bu1的下端p与第一桥臂的第1个电感Lu1的一端连接,第一桥臂的第1个电感Lu1的另一端与第一桥臂的第2个开关组Bu2的上端o连接;第一桥臂的第i个开关组Bui的下端p与第一桥臂的第i+1个开关组Bu(i+1)的上端o连接,其中i的取值为2~N-1;第一桥臂的第N个开关组BuN的下端p与第一桥臂的第2个电感Lu2的一端连接,第一桥臂的第2个电感Lu2的另一端与第一桥臂的第N+1个开关组Bu(N+1)的上端o连接;第二桥臂的电路结构、第三桥臂的电路结构与第一桥臂的电路结构完全一致;第k个三相负载的三端分别与第一桥臂的第k+1个开关组Bu(k+1)的上端o、第二桥臂的第k+1个开关组Bv(k+1)的上端o、第三桥臂的第k+1个开关组Bw(k+1)的上端o连接,其中k的取值为1~N-1;第N个三相负载的三端分别与第一桥臂的第N个开关组BuN的下端p、第二桥臂的第N个开关组BvN的下端p、第三桥臂的第N个开关组BwN的下端p连接。The positive pole of the DC power supply U dc is connected to the upper end o of the first switch group B u1 of the first bridge arm, the upper end o of the first switch group B v1 of the second bridge arm, and the first switch group B of the third bridge arm The upper end o of w1 is connected; the lower end p of the first switch group B u1 of the first bridge arm is connected with one end of the first inductor L u1 of the first bridge arm, and the other end of the first inductor L u1 of the first bridge arm One end is connected to the upper end o of the second switch group B u2 of the first bridge arm; the lower end p of the i-th switch group B ui of the first bridge arm is connected to the i+1th switch group B u of the first bridge arm ( The upper end o of i+1) is connected, where the value of i is 2 to N-1; the lower end p of the Nth switch group B uN of the first bridge arm is connected to one end of the second inductor L u2 of the first bridge arm connection, the other end of the second inductance L u2 of the first bridge arm is connected to the upper end o of the N+1th switch group B u(N+1) of the first bridge arm; the circuit structure of the second bridge arm, the first The circuit structure of the three bridge arms is exactly the same as that of the first bridge arm; the three terminals of the kth three-phase load are respectively connected to the upper end of the k+1th switch group Bu(k+1) of the first bridge arm o , the upper end o of the k+1th switch group Bv(k+1) of the second bridge arm, and the upper end o of the k+1th switch group Bw(k+1) of the third bridge arm are connected, wherein k The value is 1 to N-1; the three terminals of the Nth three-phase load are respectively connected to the lower end p of the Nth switch group B uN of the first bridge arm, and the lower end of the Nth switch group B vN of the second bridge arm p. The lower end p of the Nth switch group B wN of the third bridge arm is connected.

图2示出图1所示的N输出三相3N+3开关组MMC逆变器的开关功率单元的电路结构图。功率开关单元由第一开关管S1、第二开关管S2、第一二极管D1、第二二极管D2和电容CSM构成。其中,电容CSM的正极与第一开关管S1的集电极、第一二极管D1的阴极连接,第一开关管S1的发射极与第一二极管D1的阳极、第二开关管S2的集电极、第二二极管D2的阴极连接,第二开关管S2的发射极与第二二极管D2的阳极、电容CSM的负极连接;第二开关管S2的集电极作为第一输出端,第二开关管S2的发射极作为第二输出端。FIG. 2 shows a circuit structure diagram of a switching power unit of the N-output three-phase 3N+3 switch group MMC inverter shown in FIG. 1 . The power switch unit is composed of a first switch tube S 1 , a second switch tube S 2 , a first diode D 1 , a second diode D 2 and a capacitor C SM . Wherein, the anode of the capacitor CSM is connected to the collector of the first switching transistor S1 and the cathode of the first diode D1 , and the emitter of the first switching transistor S1 is connected to the anode of the first diode D1 and the first diode D1 . The collector of the second switching tube S2 is connected to the cathode of the second diode D2 , and the emitter of the second switching tube S2 is connected to the anode of the second diode D2 and the negative pole of the capacitor CSM ; the second switch The collector of the transistor S2 serves as the first output terminal, and the emitter of the second switching transistor S2 serves as the second output terminal.

如图1所示,第一桥臂的第i个开关组Bui的第j个功率开关单元SMBuij的第二输出端与第一桥臂的第i个开关组Bui的第j+1个功率开关单元SMBui(j+1)的第一输出端连接,其中j取值为1~n-1,i取值为1~N+1;第二桥臂的第i个开关组Bvi的第j个功率开关单元SMBvij的第二输出端与第二桥臂的第i个开关组Bvi的第j+1个功率开关单元SMBvi(j+1)的第一输出端连接;第三桥臂的第i个开关组Bvi的第j个功率开关单元SMBvij的第二输出端与第三桥臂的第i个开关组Bvi的第j+1个功率开关单元SMBvi(j+1)的第一输出端连接。As shown in Figure 1, the second output terminal of the jth power switch unit SM Buij of the i-th switch group B ui of the first bridge arm is connected to the j+1th power switch unit SM Buij of the i-th switch group B ui of the first bridge arm The first output terminal of a power switch unit S MBui(j+1) is connected, where j takes a value from 1 to n-1, and i takes a value from 1 to N+1; the i-th switch group Bvi of the second bridge arm The second output end of the jth power switch unit SM Bvij of the second bridge arm is connected to the first output end of the j+1th power switch unit SM Bvi(j+1) of the ith switch group Bvi of the second bridge arm; The second output terminal of the j-th power switch unit SM Bvij of the i-th switch group Bvi of the three-bridge arm and the j+1-th power switch unit SM Bvi(j+ 1) The first output terminal is connected.

如图1所示,k路交流输出线电压为:As shown in Figure 1, the k-way AC output line voltage is:

uu uvkuvk == ΣΣ ii == NN ++ 11 -- KK NN ++ 11 uu BuiBui -- ΣΣ ii == 11 kk uu BuiBui 22 -- ΣΣ ii == NN ++ 11 -- kk NN ++ 11 uu BviBvi -- ΣΣ ii == 11 kk uu BviBvi 22 ,, (( kk == 1,21,2 ,, ·· ·&Center Dot; ·· ,, NN )) -- -- -- (( 11 ))

uu vwkvwk == ΣΣ ii == NN ++ 11 -- KK NN ++ 11 uu BuiBui -- ΣΣ ii == 11 kk uu BuiBui 22 -- ΣΣ ii == NN ++ 11 -- kk NN ++ 11 uu BviBvi -- ΣΣ ii == 11 kk uu BviBvi 22 ,, (( kk == 1,21,2 ,, ·&Center Dot; ·&Center Dot; ·&Center Dot; ,, NN )) -- -- -- (( 22 ))

uu wukwuk == ΣΣ ii == NN ++ 11 -- KK NN ++ 11 uu BuiBui -- ΣΣ ii == 11 kk uu BuiBui 22 -- ΣΣ ii == NN ++ 11 -- kk NN ++ 11 uu BviBvi -- ΣΣ ii == 11 kk uu BviBvi 22 ,, (( kk == 1,21,2 ,, ·&Center Dot; ·· ·· ,, NN )) -- -- -- (( 33 ))

公式(1)~(3)中,uBui为第一桥臂的第i个开关组的输出电压,uBvi为第二桥臂的第i个开关组的输出电压,uBwi为第三桥臂的第i个开关组的输出电压。In formulas (1) to (3), u Bui is the output voltage of the i-th switch group of the first bridge arm, u Bvi is the output voltage of the i-th switch group of the second bridge arm, and u Bwi is the output voltage of the i-th switch group of the second bridge arm, and u Bwi is the output voltage of the third bridge arm The output voltage of the ith switch group of the arm.

图1所示的N输出三相3N+3开关组MMC逆变器采用载波移相PWM控制,如图3a~图3c所示。第一桥臂的第i个开关组Bui的第j个功率开关单元SMBuij、第二桥臂的第i个开关组Bvi的第j个功率开关单元SMBvij和第三桥臂的第i个开关组Bwi的第j个功率开关单元SMBwij均采用相同三角波作为第j个载波Cj,其中i取值为1~N+1,j的取值为1~n;n个载波(C1、C2、…、Cn)依次滞后相角360°/n;第k个负载的第一桥臂的端auk采用第一桥臂的第k个正弦波RLuk叠加第k个直流偏置Rdok得到第一桥臂的第k个调制波RLuk+Rdok,其中k的取值为1~N;第k个负载的第二桥臂的端avk采用第二桥臂的第k个正弦波RLvk叠加第k个直流偏置Rdok得到第二桥臂的第k个调制波RLvk+Rdok;第k个负载的第三桥臂的端awk采用第三桥臂的第k个正弦波RLwk叠加第k个直流偏置Rdok得到第三桥臂的第k个调制波RLwk+Rdok;第一桥臂的第k个正弦波RLuk、第二桥臂的第k个正弦波RLvk和第三桥臂的第k个正弦波RLwk相位依次相差120°。The N-output three-phase 3N+3 switch group MMC inverter shown in Figure 1 adopts carrier phase-shift PWM control, as shown in Figure 3a to Figure 3c. The j-th power switch unit SM Bu i j of the i-th switch group Bui of the first bridge arm, the j-th power switch unit SM Bvij of the i-th switch group Bvi of the second bridge arm, and the j-th power switch unit SM Bvij of the third bridge arm The j-th power switch unit SM Bwij of the i-th switch group B wi uses the same triangular wave as the j-th carrier C j , where i takes a value from 1 to N+1, and j takes a value from 1 to n; n The carrier wave (C 1 , C 2 ,..., C n ) lags behind the phase angle by 360°/n in turn; the terminal a uk of the first bridge arm of the kth load adopts the kth sine wave R Luk of the first bridge arm to superimpose the first k DC bias R dok to obtain the kth modulated wave R Luk +R dok of the first bridge arm, where the value of k is 1 to N; the terminal a vk of the second bridge arm of the kth load adopts the second The kth sine wave R Lvk of the bridge arm superimposes the kth DC offset R dok to obtain the kth modulation wave R Lvk +R dok of the second bridge arm; the terminal a wk of the third bridge arm of the kth load adopts The kth sine wave R Lwk of the third bridge arm superimposes the kth DC offset R dok to obtain the kth modulation wave R Lwk +R dok of the third bridge arm; the kth sine wave R Luk of the first bridge arm , The kth sine wave R Lvk of the second bridge arm and the kth sine wave R Lwk of the third bridge arm have a phase difference of 120° in sequence.

所述控制方法可以保证所述变换器的每个桥臂在每一时刻有n个功率开关单元的输出电压uSM=E,N*n个功率开关单元的输出电压uSM=0,即满足其中E为每个功率开关单元中电容CSM上的电压,且有E=Udc/n。The control method can ensure that each bridge arm of the converter has output voltage u SM =E of n power switch units at each moment, and output voltage u SM =0 of N*n power switch units, that is, satisfies and Where E is the voltage on the capacitor C SM in each power switch unit, and E=U dc /n.

以三输出三相十二开关组九电平MMC逆变器为例,图4a示出其工作于CF模式下第一桥臂的第1个调制波RLu1+Rdo1、第一桥臂的第2个调制波RLu2+Rdo1、第一桥臂的第3个调制波RLu3+Rdo1与第j个载波Cj的关系。从图4a可以看出,第一桥臂的第1个正弦波RLu1、第一桥臂的第2个正弦波RLu2和第一桥臂的第3个正弦波RLu3的频率相同,幅值不相同。图4b示出其工作于DF模式下第一桥臂的第1个调制波RLu1+Rdo1、第一桥臂的第2个调制波RLu2+Rdo1、第一桥臂的第3个调制波RLu3+Rdo1与第j个载波Cj的关系。从图4b可以看出,第一桥臂的第1个正弦波RLu1、第一桥臂的第2个正弦波RLu2和第一桥臂的第3个正弦波RLu3的频率和幅值均不相同。第二桥臂的第1个第1个调制波RLv1+Rdo1、第二桥臂的第2个调制波RLv2+Rdo1、第二桥臂的第3个调制波RLv3+Rdo1与第j个载波Cj的关系和第一桥臂的的第1个调制波RLu1+Rdo1、第一桥臂的第2个调制波RLu2+Rdo1、第一桥臂的第3个调制波RLu3+Rdo1与第j个载波Cj的关系完全相同;第三桥臂的第1个第1个调制波RLw1+Rdo1、第三桥臂的第2个调制波RLw2+Rdo1、第三桥臂的第3个调制波RLw3+Rdo1与第j个载波Cj的关系和第一桥臂的的第1个调制波RLu1+Rdo1、第一桥臂的第2个调制波RLu2+Rdo1、第一桥臂的第3个调制波RLu3+Rdo1与第j个载波Cj的关系完全相同。Taking the three-output three-phase twelve-switch group nine-level MMC inverter as an example, Figure 4a shows the first modulation wave R Lu1 +R do1 of the first bridge arm and the first bridge arm’s The relationship between the second modulated wave R Lu2 +R do1 , the third modulated wave R Lu3 +R do1 of the first bridge arm, and the j-th carrier C j . It can be seen from Figure 4a that the frequency of the first sine wave R Lu1 of the first bridge arm, the second sine wave R Lu2 of the first bridge arm and the third sine wave R Lu3 of the first bridge arm are the same, and the amplitude The values are not the same. Figure 4b shows the first modulation wave R Lu1 +R do1 of the first bridge arm, the second modulation wave R Lu2 +R do1 of the first bridge arm, and the third modulation wave of the first bridge arm when it works in DF mode The relationship between the modulated wave R Lu3 +R do1 and the jth carrier C j . It can be seen from Figure 4b that the frequencies and amplitudes of the first sine wave R Lu1 of the first bridge arm, the second sine wave R Lu2 of the first bridge arm and the third sine wave R Lu3 of the first bridge arm All are different. The first and first modulation wave R Lv1 +R do1 of the second bridge arm, the second modulation wave R Lv2 +R do1 of the second bridge arm, the third modulation wave R Lv3 +R do1 of the second bridge arm The relationship with the jth carrier C j and the first modulation wave R Lu1 +R do1 of the first bridge arm, the second modulation wave R Lu2 +R do1 of the first bridge arm, the third modulation wave of the first bridge arm The relationship between the first modulation wave R Lu3 +R do1 and the jth carrier C j is exactly the same; the first modulation wave R Lw1 +R do1 of the third bridge arm, the second modulation wave R of the third bridge arm Lw2 +R do1 , the relationship between the third modulation wave R Lw3 +R do1 of the third bridge arm and the jth carrier C j and the first modulation wave R Lu1 +R do1 of the first bridge arm, the first bridge The relationship between the second modulating wave R Lu2 +R do1 of the bridge arm, the third modulating wave R Lu3 +R do1 of the first bridge arm and the jth carrier C j is exactly the same.

图5a1、图5a2、图5a3为三输出三相十二开关组九电平MMC逆变器工作于CF模式的仿真波形图,依次是第1个三相负载的3个线电压、第1个三相负载的3个线电流、第2个三相负载的3个线电压、第2个三相负载的3个线电流、第3个三相负载的3个线电压和第3个三相负载的3个线电流,从图可见第1个三相负载、第2个三相负载和第3个三相负载的线电流频率相同,第1个三相负载、第2个三相负载和第3个三相负载的线电流幅值不相同;图5b1、图5b2、图5b3为三输出三相十二开关组九电平MMC逆变器工作于DF模式的仿真波形图,依次是第1个三相负载的3个线电压、第1个三相负载的3个线电流、第2个三相负载的3个线电压、第2个三相负载的3个线电流、第3个三相负载的3个线电压和第3个三相负载的3个线电流,从图可见第1个三相负载、第2个三相负载和第3个三相负载的电流频率和幅值均不相同。Figure 5a1, Figure 5a2, and Figure 5a3 are the simulation waveform diagrams of the three-output three-phase twelve-switch group nine-level MMC inverter working in CF mode, which are the three line voltages of the first three-phase load, the first 3 line currents of 3-phase load, 3 line-to-line voltages of 2nd 3-phase load, 3 line currents of 2nd 3-phase load, 3 line-to-line voltages of 3rd 3-phase load and 3rd 3-phase The three line currents of the load, it can be seen from the figure that the line current frequency of the first three-phase load, the second three-phase load and the third three-phase load are the same, the first three-phase load, the second three-phase load and the The line current amplitude of the third three-phase load is different; Figure 5b1, Figure 5b2, and Figure 5b3 are the simulation waveform diagrams of the three-output three-phase twelve-switch group nine-level MMC inverter working in DF mode, followed by the first 3 line voltages for 1 three-phase load, 3 line currents for the first three-phase load, 3 line voltages for the second three-phase load, 3 line currents for the second three-phase load, 3 line currents for the 3rd three-phase load The 3 line voltages of the three-phase load and the 3 line currents of the third three-phase load, the current frequency and amplitude of the first three-phase load, the second three-phase load and the third three-phase load can be seen from the figure All are different.

上述实施例为本实用新型较佳的实施方式,但本实用新型的实施方式并不受所述实施例的限制,其他的任何未背离本实用新型的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本实用新型的保护范围之内。The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (5)

1.N output three-phase 3N+3 switches set MMC inverter, is characterized in that: comprise DC power supply (U dc), the first brachium pontis, the second brachium pontis, the 3rd brachium pontis and N threephase load; Described the first brachium pontis is by N+1 switches set (B u1, B u2..., B u (N+1)) and 2 inductance (L u1, L u2) be in series, described the second brachium pontis is by N+1 switches set (B v1, B v2..., B v (N+1)) and 2 inductance (L v1, L v2) be in series, described the 3rd brachium pontis is by N+1 switches set (B w1, B w2..., B w (N+1)) and 2 inductance (L w1, L w2) be in series; I switches set (B of the first brachium pontis ui) by n power switch unit (SM bui1, SM bui2..., SM buin) be in series, i switches set (B of the second brachium pontis vi) by n power switch unit (SM bvi1, SM bvi2..., SM bvin) be in series, i switches set (B of the 3rd brachium pontis wi) by n power switch unit (SM bwi1, SM bwi2..., SM bwin) be in series, wherein the value of i is 1 ~ N+1; Three ends of k threephase load respectively with k+1 switches set (B of the first brachium pontis u (k+1)) upper end (o), k+1 switches set (B of the second brachium pontis v (k+1)) upper end (o), k+1 switches set (B of the 3rd brachium pontis w (k+1)) upper end (o) connect, wherein the value of k is 1 ~ N-1; Three ends of N threephase load respectively with N switches set (B of the first brachium pontis uN) lower end (p), N switches set (B of the second brachium pontis vN) lower end (p), N switches set (B of the 3rd brachium pontis wN) lower end (p) connect; Three ends of k load are as the output of k road three-phase, and wherein the value of k is 1 ~ N, N>2, and n is positive integer.
2. N output three-phase 3N+3 switches set MMC inverter according to claim 1, is characterized in that: two inductance (L of the first brachium pontis u1, L u2) intercouple, form a pair of coupling inductance; Two inductance (L of the second brachium pontis v1, L v2) intercouple, form a pair of coupling inductance; Two inductance (L of the 3rd brachium pontis w1, L w2) intercouple, form a pair of coupling inductance.
3. N output three-phase 3N+3 switches set MMC inverter according to claim 1, is characterized in that: DC power supply (U dc) positive pole and the 1st switches set (B of the first brachium pontis u1) upper end (o), the 1st switches set (B of the second brachium pontis v1) upper end (o), the 1st switches set (B of the 3rd brachium pontis w1) upper end (o) connect; The 1st switches set (B of the first brachium pontis u1) the 1st inductance (L of lower end (p) and the first brachium pontis u1) one end connect, the 1st inductance (L of the first brachium pontis u1) the other end and the 2nd switches set (B of the first brachium pontis u2) upper end (o) connect; I switches set (B of the first brachium pontis ui) i+1 switches set (B of lower end (p) and the first brachium pontis u (i+1)) upper end (o) connect, wherein the value of i is 2 ~ N-1; N switches set (B of the first brachium pontis uN) the 2nd inductance (L of lower end (p) and the first brachium pontis u2) one end connect, the 2nd inductance (L of the first brachium pontis u2) the other end and N+1 switches set (B of the first brachium pontis u (N+1)) upper end (o) connect; The circuit structure of the circuit structure of the second brachium pontis, the circuit structure of the 3rd brachium pontis and the first brachium pontis is in full accord; Three ends of k threephase load respectively with k+1 switches set (B of the first brachium pontis u (k+1)) upper end (o), k+1 switches set (B of the second brachium pontis v (k+1)) upper end (o), k+1 switches set (B of the 3rd brachium pontis w (k+1)) upper end (o) connect, wherein the value of k is 1 ~ N-1; Three ends of N threephase load respectively with N switches set (B of the first brachium pontis uN) lower end (p), N switches set (B of the second brachium pontis vN) lower end (p), N switches set (B of the 3rd brachium pontis wN) lower end (p) connect.
4. N output three-phase 3N+3 switches set MMC inverter according to claim 1, is characterized in that: power switch unit is by the first switching tube (S 1), second switch pipe (S 2), the first diode (D 1), the second diode (D 2) and electric capacity (C sM) form, wherein, electric capacity (C sM) positive pole and the first switching tube (S 1) collector electrode, the first diode (D 1) negative electrode connect, the first switching tube (S 1) emitter and the first diode (D 1) anode, second switch pipe (S 2) collector electrode, the second diode (D 2) negative electrode connect, second switch pipe (S 2) emitter and the second diode (D 2) anode, electric capacity (C sM) negative pole connect; Second switch pipe (S 2) collector electrode as the first output, second switch pipe (S 2) emitter as the second output.
5. N output three-phase 3N+3 switches set MMC inverter according to claim 1, is characterized in that: i switches set (B of the first brachium pontis ui) j power switch unit (SM buij) the second output and i switches set (B of the first brachium pontis ui) j+1 power switch unit (SM bui (j+1)) first output connect, wherein j value is 1 ~ n-1, i value is 1 ~ N+1; I switches set (B of the second brachium pontis vi) j power switch unit (SM bvij) the second output and i switches set (B of the second brachium pontis vi) j+1 power switch unit (SM bvi (j+1)) first output connect; I switches set (B of the 3rd brachium pontis vi) j power switch unit (SM bvij) the second output and i switches set (B of the 3rd brachium pontis vi) j+1 power switch unit (SM bvi (j+1)) first output connect.
CN201420056637.8U 2014-01-28 2014-01-28 N-output three-phase 3N+3 switch group MMC inverter Expired - Fee Related CN203722504U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103780113A (en) * 2014-01-28 2014-05-07 华南理工大学 N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter
CN108880235A (en) * 2018-07-25 2018-11-23 华南理工大学 Single-input multi-output M switch group DC-DC converter and control method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103780113A (en) * 2014-01-28 2014-05-07 华南理工大学 N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter
CN103780113B (en) * 2014-01-28 2017-01-18 华南理工大学 N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter
CN108880235A (en) * 2018-07-25 2018-11-23 华南理工大学 Single-input multi-output M switch group DC-DC converter and control method thereof

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