WO2024124679A1 - 一种三相四桥臂九电平变换器 - Google Patents

一种三相四桥臂九电平变换器 Download PDF

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Publication number
WO2024124679A1
WO2024124679A1 PCT/CN2023/075455 CN2023075455W WO2024124679A1 WO 2024124679 A1 WO2024124679 A1 WO 2024124679A1 CN 2023075455 W CN2023075455 W CN 2023075455W WO 2024124679 A1 WO2024124679 A1 WO 2024124679A1
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Prior art keywords
power electronic
switch tube
electronic switch
arm
bridge
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English (en)
French (fr)
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杨勇
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Suzhou University
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Suzhou 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
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present application relates to the technical field of converters, and in particular to a three-phase four-bridge-arm nine-level converter.
  • Multilevel inverters have the advantages of lower common-mode voltage, smaller switch voltage stress, and lower distortion in output voltage and current. They have received extensive attention in the fields of new energy power generation systems and motor drive applications, and have become a research hotspot for scholars at home and abroad.
  • the most common multilevel converter topologies are mainly of three types: diode clamped, flying capacitor, and cascaded H-bridge.
  • diode-clamped three-level converters are widely used in renewable energy power generation and motor drive.
  • the number of output levels of the diode-clamped multi-level converter topology exceeds 3, the number of clamping diodes and switching tubes required increases sharply, making the multi-level converter structure complex.
  • the flying capacitor multi-level converter uses capacitors instead of diodes for clamping, and outputs multiple voltage waveforms through the balancing capacitors between the phase buses.
  • the number of output levels of the converter exceeds 3
  • a large number of clamping capacitors are also required, and the balancing problem of the voltages of the capacitors on the DC side will become complicated and difficult to control.
  • the cascaded H-bridge multilevel converter requires many isolated power supplies, which makes the topology of the cascaded H-bridge multilevel converter more complicated.
  • the present application proposes a novel three-phase four-bridge-arm nine-level converter, which combines a diode-clamped multi-level converter and a flying capacitor multi-level converter.
  • the present application proposes a three-phase four-bridge-arm nine-level converter, comprising:
  • the converter comprises an A bridge arm, a B bridge arm, a C bridge arm and an n bridge arm, and the structures of the four bridge arms are the same.
  • the A bridge arm includes a first power electronic switch tube, a second power electronic switch tube, a third power electronic switch tube, a fourth power electronic switch tube, a fifth power electronic switch tube, a sixth power electronic switch tube, a seventh power electronic switch tube, an eighth power electronic switch tube, a ninth power electronic switch tube, a tenth power electronic switch tube, a first power diode, a second power diode, a first DC bus capacitor, a second DC bus capacitor, a first flying capacitor, and a second flying capacitor.
  • the drain of the first power electronic switch tube is connected to the positive pole of the input power supply at point P, the source of the first power electronic switch tube is connected to the drain of the second power electronic switch tube at point Pa1 , and the source of the second power electronic switch tube is connected to the drain of the third power electronic switch tube at point Pa2 .
  • this invention device adds an extra bridge arm on the basis of the traditional three-phase three-bridge arm converter.
  • the midpoint of the bridge arm is connected to the neutral point of the load, which is used to provide a zero-sequence current path and control the neutral point voltage, so that the converter can maintain higher power quality under unbalanced and nonlinear working conditions, and is suitable for balanced loads and unbalanced loads. Therefore, the invented three-phase four-bridge arm nine-level converter has a good application prospect in medium and high voltage new energy power generation systems.
  • FIG1 shows a schematic structural diagram of a three-phase, four-bridge-arm, nine-level converter of the present application.
  • FIG2 shows a structure diagram of arm A of a three-phase, four-arm, nine-level converter according to an embodiment of the present application.
  • FIG3 is a schematic diagram showing a state of an output V1 of an arm A of a three-phase, four-arm, nine-level converter according to an embodiment of the present application.
  • FIG4 is a schematic diagram showing a state of an output V2 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG5 is a schematic diagram showing a state of an output V3 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG6 is a schematic diagram showing a state of an output V4 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG7 is a schematic diagram showing a state of an output V5 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG8 is a schematic diagram showing a state of an output V6 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG9 is a schematic diagram showing a state of an output V7 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG10 is a schematic diagram showing a state of an output V8 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG11 is a schematic diagram showing a state of an output V9 of an arm A of a three-phase, four-arm, nine-level converter according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram showing a state of an output V10 of an arm A of a three-phase, four-arm, nine-level converter according to an embodiment of the present application.
  • FIG13 is a schematic diagram showing a state of an output V11 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • FIG14 is a schematic diagram showing a state of an output V12 of a bridge arm A of a three-phase, four-bridge-arm, nine-level converter according to an embodiment of the present application.
  • the topological structure of the novel three-phase four-bridge arm nine-level converter device of the present application is shown in Figure 1.
  • the converter is composed of an A bridge arm, a B bridge arm, a C bridge arm and an n bridge arm, and the structures of the four bridge arms are the same.
  • Each phase bridge arm of the three-phase four-bridge arm nine-level converter is connected to the load through an inductor L and a filter capacitor C.
  • the structural diagram of the A bridge arm of the novel three-phase four-bridge arm nine-level converter device is shown in Figure 2.
  • the A bridge arm is composed of a power electronic switch tube Sa1 , a power electronic switch tube Sa2 , a power electronic switch tube Sa3 , a power electronic switch tube Sa4 , a power electronic switch tube Sa5 , a power electronic switch tube Sa6 , a power electronic switch tube Sa7 , a power electronic switch tube Sa8 , a power electronic switch tube Sa9 , a power electronic switch tube Sa10 , a power diode Da1, a power diode Da2, a DC bus capacitor Cd1 , a DC bus capacitor Cd2 , a flying capacitor Ca1 , and a flying capacitor Ca2 .
  • the drain of the power electronic switch tube Sa1 is connected to the positive pole of the input power supply at point P, the source of the power electronic switch tube Sa1 is connected to the drain of the power electronic switch tube Sa2 at point Pa1 , the source of the power electronic switch tube Sa2 is connected to the drain of the power electronic switch tube Sa3 at point Pa2 , the source of the power electronic switch tube Sa3 is connected to the drain of the power electronic switch tube Sa4 at point O, the cathode of the power diode Da1 is connected to point Pa2 , the anode of the power diode Da1 is connected to point O, the source of the power electronic switch tube Sa4 is connected to the drain of the power electronic switch tube Sa5 at point Na2, the cathode of the power diode Da2 is connected to point O, the anode of the power diode Da2 is connected to point Na2, the source of the power electronic switch tube Sa5 is connected to the drain of the power electronic switch tube Sa6 at point Na1, the source of the power electronic switch tube Sa6 is connected to point
  • the output voltage and switch state of the A arm of the three-phase four-bridge-arm nine-level converter are shown in Table 1.
  • the DC input capacitor voltage Cd1 and the input capacitor voltage Cd2 are controlled to 4Vdc/8, and the flying capacitor Ca1 and the flying capacitor Ca2 voltage are controlled to Vdc/8.
  • “1” represents the power electronic switch tube is turned on, and "0” represents the power electronic switch tube is turned off.
  • Switch state V1 the power electronic switches Sa1 , Sa5 , and Sa7 are turned on, and the power electronic switches Sa2 , Sa3 , Sa4 , Sa6 , Sa7 , Sa9 , and Sa10 are turned off.
  • the state of the output V1 of the A arm of the three-phase four-arm nine-level converter is shown in FIG3.
  • Switching state V2 the power electronic switches Sa1 , Sa5 , Sa9 , and Sa10 are turned on, and the power electronic switches Sa2 , Sa3 , Sa4 , Sa6 , Sa7 , and Sa8 are turned off.
  • the state of the output V2 of the A arm of the three-phase four-arm nine-level converter is shown in FIG4 .
  • Switching state V3 the power electronic switches Sa1 , Sa5 , and Sa8 are turned on, and the power electronic switches Sa2 , Sa3 , Sa4 , Sa6 , Sa7 , Sa9 , and Sa10 are turned off.
  • the state of the output V3 of the A arm of the three-phase four-arm nine-level converter is shown in FIG5.
  • Switching state V4 the power electronic switches Sa3 , Sa4 , Sa5 and Sa7 are turned on, the power electronic switches Sa1 , Sa2 , Sa4 , Sa6 , Sa8 , Sa9 and Sa10 are turned off, and the state of the output V4 of the A arm of the three-phase four-arm nine-level converter is shown in FIG6 .
  • Switch state V5 the power electronic switches Sa3 , Sa4 , Sa5 , Sa9 and Sa10 are turned on, the power electronic switches Sa1 , Sa2 , Sa6 , Sa7 and Sa8 are turned off, and the state of the output V5 of the bridge arm A of the three-phase four-bridge-arm nine-level converter is shown in FIG7 .
  • Switch state V6 the power electronic switches Sa3 , Sa4 , Sa5 , and Sa8 are turned on, and the power electronic switches Sa1 , Sa2 , Sa6 , Sa7 , Sa9 , and Sa10 are turned off.
  • the state of the output V6 of the A arm of the three-phase four-arm nine-level converter is shown in FIG8 .
  • Switch state V7 the power electronic switches Sa2 , Sa3 , Sa4 , and Sa7 are turned on, and the power electronic switches Sa1 , Sa5 , Sa6 , Sa8 , Sa9 , and Sa10 are turned off.
  • the state of the output V7 of the A arm of the three-phase four-arm nine-level converter is shown in FIG9 .
  • Switch state V8 the power electronic switches Sa2 , Sa3 , Sa4 , Sa9 , and Sa10 are turned on, and the power electronic switches Sa1 , Sa5 , Sa6 , Sa7 , and Sa8 are turned off.
  • the state of the output V8 of the A arm of the three-phase four-arm nine-level converter is shown in FIG10 .
  • Switch state V9 the power electronic switches Sa2 , Sa3 , Sa4 , and Sa8 are turned on, and the power electronic switches Sa1 , Sa5 , Sa6 , Sa7 , Sa9 , and Sa10 are turned off.
  • the state of the output V9 of the A arm of the three-phase four-arm nine-level converter is shown in FIG11.
  • Switch state V10 the power electronic switches Sa2 , Sa3 , Sa4 , and Sa8 are turned on, and the power electronic switches Sa1 , Sa5 , Sa6 , Sa7 , Sa9 , and Sa10 are turned off.
  • the state of the output V10 of the A arm of the three-phase four-arm nine-level converter is shown in FIG12 .
  • Switch state V11 the power electronic switches Sa2 , Sa6 , Sa9 , and Sa10 are turned on, and the power electronic switches Sa1 , Sa3 , Sa4 , Sa5 , Sa7 , and Sa8 are turned off.
  • the state of the output V11 of the A arm of the three-phase four-arm nine-level converter is shown in FIG13 .
  • Switch state V12 the power electronic switches Sa2 , Sa6 , and Sa8 are turned on, the power electronic switches Sa1 , Sa3 , Sa4 , Sa5 , Sa7 , Sa9 , and Sa10 are turned off, and the state of the output V12 of the A arm of the three-phase four-arm nine-level converter is shown in FIG14 .
  • modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments.
  • the modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and/or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

本申请提供一种三相四桥臂九电平变换器，所述变换器包括A桥臂、B桥臂、C桥臂和n桥臂，并且四个桥臂的结构相同。每个桥臂通过电感和滤波电容与负载相连。所述A桥臂包括十个电力电子开关管、两个电力二极管、两个直流母线电容、两个飞跨电容。与传统九电平变换器相比，本申请的电力电子开关管数量大大减少以及多电平变换器的复杂度大大减少。同时，此发明装置在不平衡和非线性工况下均能保持更高的电能质量，适用于平衡负载和不平衡负载。在中高压的新能源发电系统有很好的应用前景。

Description

一种三相四桥臂九电平变换器 技术领域
本申请涉及变换器技术领域，尤其涉及一种三相四桥臂九电平变换器。
 背景技术
多电平逆变器因具有更低的共模电压、更小的开关管电压应力，以及输出电压和电流中有更低的畸变等优点，在新能源发电系统和电机驱动应用领域得到了广泛的关注，成为了国内外学者的研究热点。最常见的多电平变换器的拓扑结构主要有3种类型：二极管钳位型、飞跨电容型及级联 H 桥型。
相较于其他不同拓扑结构的变换器，二极管钳位三电平变换器在新能源发电和电机驱动方面得到广泛的应用，但二极管钳位式多电平变换器拓扑结构在变换器输出电平数超过3个后，因需要的钳位二极管及开关管数量急剧增加，从而致多电平变换器结构复杂。
飞跨电容多电平变换器由电容代替二极管进行钳位，通过各相母线间的平衡电容输出多个电压波形，在变换器输出电平数超过3个后，同样需要大量的钳位电容，而且直流侧各电容电压的平衡问题也将变得复杂并难以控制。
级联 H 桥多电平变换器需要许多隔离电源，这使得级联H桥多电平变换器的拓扑结构变得更加复杂。
 技术问题
为了应对化石能源短缺和环境污染等问题，国家大力倡导使用太阳能、风能等清洁无污染能源，作为实现电能变换和负载与电网接口装置的变换器也因此得到大力发展。随着不平衡和非线性负载的广泛应用，传统的三相三桥臂变换器不能适用不平衡负载。
 技术解决方案
针对传统三相多电平变换器的问题，本申请提出一种新型三相四桥臂九电平变换器，该新型九电平变换器将二极管钳位型多电平变换器和飞跨电容多电平变换器相结合。
基于上述目的，本申请提出了一种三相四桥臂九电平变换器，包括：
所述变换器包括A桥臂、B桥臂、C桥臂和n桥臂，并且四个桥臂的结构相同，
所述A桥臂包括第一电力电子开关管、第二电力电子开关管、第三电力电子开关管、第四电力电子开关管、第五电力电子开关管、第六电力电子开关管、第七电力电子开关管、第八电力电子开关管、第九电力电子开关管、第十电力电子开关管、第一电力二极管、第二电力二极管、第一直流母线电容、第二直流母线电容、第一飞跨电容、和第二飞跨电容，
所述第一电力电子开关管的漏极与输入电源正极P点相连，第一电力电子开关管的源极与第二电力电子开关管的漏极相连于P a1点，第二电力电子开关管的源极与第三电力电子开关管的漏极相连于P a2点。
有益效果
与传统九电平变换器相比，其电力电子开关管数量大大减少以及多电平变换器的复杂度大大减少。同时，此发明装置在传统三相三桥臂变换器的基础上增加一个额外的桥臂，桥臂的中点与负载中性点相接，用于提供零序电流通路，控制中性点电压，使变换器在不平衡和非线性工况下均能保持更高的电能质量，适用于平衡负载和不平衡负载。因此，所发明的三相四桥臂九电平变换器在中高压的新能源发电系统有很好的应用前景。
 附图说明
在附图中，除非另外规定，否则贯穿多个附图相同的附图标记表示相同或相似的部件或元素。这些附图不一定是按照比例绘制的。应该理解，这些附图仅描绘了根据本申请公开的一些实施方式，而不应将其视为是对本申请范围的限制。
图1示出本申请的三相四桥臂九电平变换器结构示意图。
图2示出根据本申请实施例的三相四桥臂九电平变换器A桥臂结构图。
图3示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V1状态示意图。
图4示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V2状态示意图。
图5示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V3状态示意图。
图6示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V4状态示意图。
图7示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V5状态示意图。
图8示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V6状态示意图。
图9示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V7状态示意图。
图10示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V8状态示意图。
图11示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V9状态示意图。
图12示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V10状态示意图。
图13示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V11状态示意图。
图14示出根据本申请实施例的三相四桥臂九电平变换器A桥臂输出V12状态示意图。
 本发明的最佳实施方式 本发明的实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅用于解释相关发明，而非对该发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与有关发明相关的部分。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
本申请的新型三相四桥臂九电平变换器装置拓扑结构如图1所示，该变换器由A桥臂、B桥臂、C桥臂和n桥臂构成，四个桥臂的结构一样。三相四桥臂九电平变换装置每相桥臂通过电感L和滤波电容C与负载相连。新型三相四桥臂九电平变换装置A桥臂的结构图如图2所示。由图2可以看出，A桥臂由电力电子开关管S a1、电力电子开关管S a2、电力电子开关管S a3、电力电子开关管S a4、电力电子开关管S a5、电力电子开关管S a6、电力电子开关管S a7、电力电子开关管S a8、电力电子开关管S a9、电力电子开关管S a10、电力二极管Da1、电力二极管Da2、直流母线电容C d1、直流母线电容C d2、飞跨电容C a1、飞跨电容C a2构成。电力电子开关管S a1的漏极与输入电源正极P点相连，电力电子开关管S a1的源极与电力电子开关管S a2的漏极相连P a1点，电力电子开关管S a2的源极与电力电子开关管S a3的漏极相连于P a2点，电力电子开关管S a3的源极与电力电子开关管S a4的漏极相连于O点，电力二极管Da1的阴极相连于P a2点，电力二极管Da1的阳极相连于O点，电力电子开关管S a4的源极与电力电子开关管S a5的漏极相连于Na2点，电力二极管Da2的阴极相连于O点，电力二极管Da2的阳极相连于Na2点，电力电子开关管S a5的源极与电力电子开关管S a6的漏极相连于Na1点，电力电子开关管S a6的源极相连于N点，电力电子开关管S a7的源极与电力电子开关管S a8的漏极相连于输出端A点，电力电子开关管S a7的漏极相连于P a1点，电力电子开关管S a8的源极相连于Na1点，电力电子开关管S a9的源极与电力电子开关管S a10的漏极相连，电力电子开关管S a9的漏极相连于O a1点，电力电子开关管S a10的漏极相连于输出端A点，直流母线滤波电容C d1一端相连A点，另一端相连O点，直流母线滤波电容C d2一端相连O点，另一端相连N点，飞跨电容C a1一端相连P a1点，另一端相连Oa1点，飞跨电容C a2一端相连Oa1点，另一端相连Na1点。
三相四桥臂九电平变换器A桥臂输出电压与开关状态如表1所示。其中直流输入电容电压C d1和输入电容电压C d2控制为4Vdc/8，飞跨电容C a1和飞跨电容C a2电压控制为Vdc/8，其中表中“1”代表电力电子开关管开通，“0”代表电力电子开关管关断。从表1可以看出：三相四桥臂九电平变换器A桥臂输出-4Vdc/8、-3Vdc/8、-2Vdc/8、-Vdc/8、0、Vdc/8、2Vdc/8、3Vdc/8、4Vdc/8九种不同的电平，大大提高变换器的性能。
开关状态V1：电力电子开关S a1、S a5、S a7开通，电力电子开关S a2、S a3、S a4、S a6、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V1状态如图3所示。
开关状态V2：电力电子开关S a1、S a5、S a9、S a10开通，电力电子开关S a2、S a3、S a4、S a6、S a7、S a8关断，三相四桥臂九电平变换器A桥臂输出V2状态如图4所示。
开关状态V3：电力电子开关S a1、S a5、S a8开通，电力电子开关S a2、S a3、S a4、S a6、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V3状态如图5所示。
开关状态V4：电力电子开关S a3、S a4、S a5、S a7开通，电力电子开关S a1、S a2、S a4、S a6、S a8、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V4状态如图6所示。
开关状态V5：电力电子开关S a3、S a4、S a5、S a9、S a10开通，电力电子开关S a1、S a2、S a6、S a7、S a8关断，三相四桥臂九电平变换器A桥臂输出V5状态如图7所示。
开关状态V6：电力电子开关S a3、S a4、S a5、S a8开通，电力电子开关S a1、S a2、S a6、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V6状态如图8所示。
开关状态V7：电力电子开关S a2、S a3、S a4、S a7开通，电力电子开关S a1、S a5、S a6、S a8、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V7状态如图9所示。
开关状态V8：电力电子开关S a2、S a3、S a4、S a9、S a10开通，电力电子开关S a1、S a5、S a6、S a7、S a8关断，三相四桥臂九电平变换器A桥臂输出V8状态如图10所示。
开关状态V9：电力电子开关S a2、S a3、S a4、S a8开通，电力电子开关S a1、S a5、S a6、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V9状态如图11所示。
开关状态V10：电力电子开关S a2、S a3、S a4、S a8开通，电力电子开关S a1、S a5、S a6、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V10状态如图12所示。
开关状态V11：电力电子开关S a2、S a6、S a9、S a10开通，电力电子开关S a1、S a3、S a4、S a5、S a7、S a8关断，三相四桥臂九电平变换器A桥臂输出V11状态如图13所示。
开关状态V12：电力电子开关S a2、S a6、S a8开通，电力电子开关S a1、S a3、S a4、S a5、S a7、S a9、S a10关断，三相四桥臂九电平变换器A桥臂输出V12状态如图14所示。
表1 三相四桥臂九电平变换器A桥臂输出电压与开关状态
需要说明的是：
在此处所提供的说明书中，说明了大量具体细节。然而，能够理解，本申请的实施例可以在没有这些具体细节的情况下实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。
类似地，应当理解，为了精简本申请并帮助理解各个发明方面中的一个或多个，在上面对本申请的示例性实施例的描述中，本申请的各个特征有时被一起分组到单个实施例、图、或者对其的描述中。然而，并不应将该公开的方法解释成反映如下意图：即所要求保护的本申请要求比在每个权利要求中所明确记载的特征更多的特征。更确切地说，如下面的权利要求书所反映的那样，发明方面在于少于前面公开的单个实施例的所有特征。因此，遵循具体实施方式的权利要求书由此明确地并入该具体实施方式，其中每个权利要求本身都作为本申请的单独实施例。
本领域那些技术人员可以理解，可以对实施例中的设备中的模块进行自适应性地改变并且把它们设置在与该实施例不同的一个或多个设备中。可以把实施例中的模块或单元或组件组合成一个模块或单元或组件，以及此外可以把它们分成多个子模块或子单元或子组件。除了这样的特征和/或过程或者单元中的至少一些是相互排斥之外，可以采用任何组合对本说明书(包括伴随的权利要求、摘要和附图)中公开的所有特征以及如此公开的任何方法或者设备的所有过程或单元进行组合。除非另外明确陈述，本说明书(包括伴随的权利要求、摘要和附图)中公开的每个特征可以由提供相同、等同或相似目的的替代特征来代替。
此外，本领域的技术人员能够理解，尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征，但是不同实施例的特征的组合意味着处于本申请的范围之内并且形成不同的实施例。例如，在下面的权利要求书中，所要求保护的实施例的任意之一都可以以任意的组合方式来使用。
应该注意的是上述实施例对本申请进行说明而不是对本申请进行限制，并且本领域技术人员在不脱离所附权利要求的范围的情况下可设计出替换实施例。在权利要求中，不应将位于括号之间的任何参考符号构造成对权利要求的限制。单词“包含”不排除存在未列在权利要求中的元件或步骤。位于元件之前的单词“一”或“一个”不排除存在多个这样的元件。本申请可以借助于包括有若干不同元件的硬件以及借助于适当编程的计算机来实现。在列举了若干系统的单元权利要求中，这些系统中的若干个可以是通过同一个硬件项来具体体现。单词第一、第二、以及第三等的使用不表示任何顺序。可将这些单词解释为名称。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到其各种变化或替换，这些都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (8)

  1. 一种三相四桥臂九电平变换器，其特征在于，
    所述变换器包括A桥臂、B桥臂、C桥臂和n桥臂，并且四个桥臂的结构相同；
    所述A桥臂包括第一电力电子开关管、第二电力电子开关管、第三电力电子开关管、第四电力电子开关管、第五电力电子开关管、第六电力电子开关管、第七电力电子开关管、第八电力电子开关管、第九电力电子开关管、第十电力电子开关管、第一电力二极管、第二电力二极管、第一直流母线电容、第二直流母线电容、第一飞跨电容、和第二飞跨电容；
    所述第一电力电子开关管的漏极与输入电源正极P点相连，第一电力电子开关管的源极与第二电力电子开关管的漏极相连于P a1点，第二电力电子开关管的源极与第三电力电子开关管的漏极相连于P a2点。
  2. 根据权利要求1所述的一种三相四桥臂九电平变换器，其特征在于，每个桥臂通过电感和滤波电容与负载相连。
  3. 根据权利要求1所述的一种三相四桥臂九电平变换器，其特征在于，所述第三电力电子开关管的源极与第四电力电子开关管S a4的漏极相连于O点，第一电力二极管Da1的阴极相连于P a2点，第一电力二极管Da1的阳极相连于O点。
  4. 根据权利要求3所述的一种三相四桥臂九电平变换器，其特征在于，所述第四电力电子开关管的源极与第五电力电子开关管的漏极相连于Na2点，第二电力二极管的阴极相连于O点，第二电力二极管的阳极相连于Na2点。
  5. 根据权利要求4所述的一种三相四桥臂九电平变换器，其特征在于，所述第五电力电子开关管的源极与第六电力电子开关管的漏极相连于Na1点，第六电力电子开关管的源极相连于N点。
  6. 根据权利要求5所述的一种三相四桥臂九电平变换器，其特征在于，所述第七电力电子开关管的源极与第八电力电子开关管的漏极相连于输出端A点，第七电力电子开关管的漏极相连于P a1点，第八电力电子开关管的源极相连于Na1点。
  7. 根据权利要求6所述的一种三相四桥臂九电平变换器，其特征在于，所述第九电力电子开关管的源极与第十电力电子开关管的漏极相连，第九电力电子开关管的漏极相连于O a1点，第十电力电子开关管的漏极相连于输出端A点。
  8. 根据权利要求7所述的一种三相四桥臂九电平变换器，其特征在于，所述第一直流母线滤波电容的一端相连A点，另一端相连O点，第二直流母线滤波电容的一端相连O点，另一端相连N点，第一飞跨电容一端相连P a1点，另一端相连Oa1点，第二飞跨电容一端相连Oa1点，另一端相连Na1点。
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