CN120956087A - 三相共n点级联型简化隔离非隔离混合型电力电子变压器 - Google Patents
三相共n点级联型简化隔离非隔离混合型电力电子变压器Info
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC 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
- H02M7/217—Conversion of AC power input into DC 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
- H02M7/219—Conversion of AC power input into DC 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 in a bridge configuration
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- 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
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- Power Engineering (AREA)
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Abstract
本发明公开了三相共N点级联型简化隔离非隔离混合型电力电子变压器，属于变压器技术领域，每相输入通过级联式变换器结构连接至中性点；所述级联式变换器结构包括多个整流逆变模块，其前级为级联整流结构，后级为级联逆变结构；所述级联式变换器结构包括至少一个隔离模块，所述隔离模块设置在级联式变换器结构的首端；当整流逆变模块的数量为3时，第二个整流逆变模块为三桥臂结构，第三个整流逆变模块为两桥臂结构；当整流逆变模块的数量大于3时，第二个以后的整流逆变模块均为两桥臂结构。本发明缩减了拓扑非隔离模块的部分开关管，降低了开关损耗管损耗，同时避免冗余开关状态对三相共N点的影响。
Description
技术领域
本发明涉及变压器技术领域，尤其涉及三相共N点级联型简化隔离非隔离混合型电力电子变压器。
背景技术
三相-三相高压变频器广泛应用在高压电机的控制与调速中。传统的高压变频器常通过多抽头变压器对输入电压进行降压、并对输入输出进行隔离。然而工频变压器存在成本高、体积大、功率密度低等问题。
面对该问题，行业内现阶段主要解决方法为：
1.采用如图1所示的全隔离型电力电子变压器，其典型架构由AC-DC整流级、高频隔离DC-DC级和DC-AC逆变级构成，高频变压器替代工频变压器可以显著减小体积并实现输入输出侧电气隔离。
2.采用如图2所示的隔离非隔离混合电力电子变压器（HPET），其减少了部分中间隔离DC-DC级，进一步减少了功率传输级数，降低了系统成本和功率损耗。
但现有方案存在以下问题：
1.全隔离型电力电子变压器需要隔离DC-DC实现输入输出的电气隔离，电路结构较为复杂、开关器件较多，导致成本较高。
2.在HPET中，输入输出N点的电位差由开关状态决定，如果输入三相N点与三个变换器直接相连，输出三相的负端部分开关管与其它开关管开关状态重复，这部分开关状态无法使用，一方面冗余开关存在功率损耗，另一方面在这部分开关状态的影响下可能会在输入与输出之间产生电位差，导致HPET的输入三相与输出三相不能共N点。该种情况下驱动三相电机时会产生共模电压，引发轴承电流损坏电机。
发明内容
本发明的目的在于克服现有技术中存在的问题，提供了三相共N点级联型简化隔离非隔离混合型电力电子变压器。
本发明的目的是通过以下技术方案来实现的：
提供一种三相共N点级联型隔离非隔离混合型电力电子变压器，每相输入通过级联式变换器结构连接至中性点；所述级联式变换器结构包括多个整流逆变模块，其前级为级联整流结构，后级为级联逆变结构；其中，首端整流逆变模块中级联整流结构的正端与某相交流电连接，首端整流逆变模块中级联逆变结构的正端与三相电机的某相交流电连接；
所述级联式变换器结构包括至少一个隔离模块，所述隔离模块设置在级联式变换器结构的首端；
当整流逆变模块的数量为3时，第二个整流逆变模块为三桥臂结构，第三个整流逆变模块为两桥臂结构；当整流逆变模块的数量大于3时，第二个以后的整流逆变模块均为两桥臂结构。
在一些实施例中，所述隔离模块为隔离型DC-DC模块。
在一些实施例中，当隔离模块的数量大于1时，所述隔离模块均设置在级联式变换器结构的首端同一侧。
在一些实施例中，每个整流逆变模块的级联逆变结构的负端与所述中性点直连。
需要进一步说明的是，上述各实施例对应的技术特征在不冲突的情况下可以相互组合或替换构成新的技术方案。
与现有技术相比，本发明有益效果是：
1.本发明三相共N点级联型简化隔离非隔离混合型电力电子变压器的每相输入通过级联式变换器结构连接至中性点，在所述级联式变换器结构中，第二个整流逆变模块为三桥臂结构，第二个以后的整流逆变模块均为两桥臂结构，取消了后续模块之间的跨桥连接，第二个整流逆变模块的级联逆变结构的负端与所述中性点直连。使得输出侧的电位锁定至中性点，舍弃了不可用开关状态中部分桥臂的冗余开关管，避免输入输出之间受冗余开关状态影响产生电位差，保证输入三相与输出三相共N点，提高系统的可靠性。
2.本发明缩减了拓扑非隔离模块的部分开关管，降低了开关管损耗，从而提高效率，显著减少硬件成本，简化了控制逻辑，减少了拓扑中存在的潜在故障点，增强了可靠性。
3.本发明使输入输出共地，在非隔离的基础上实现输入输出共地，减少了地线回路中也简化了电路布局，降低了设计复杂性与制造成本。
附图说明
图1为传统隔离型电力电子变压器拓扑示意图；
图2为传统隔离非隔离混合电力电子变压器拓扑示意图；
图3为本发明首端一个隔离模块的三模块级联变压器拓扑示意图；
图4为本发明首端一个隔离模块的四模块级联变压器拓扑示意图；
图5为本发明三模块级联变压器的共N点拓扑结构示意图。
具体实施方式
下面结合附图对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，以上现有技术中的方案所存在的缺陷，均是发明人在经过实践并仔细研究后得出的结果，因此，上述问题的发现过程以及下文中本申请实施例针对上述问题所提出的解决方案，都应该是发明人在发明创造过程中对本申请做出的贡献，而不应当理解为本领域技术人员所公知的技术内容。
在一示例性实施例中，提供一种三相共N点级联型简化隔离非隔离混合型电力电子变压器，每相输入通过级联式变换器结构连接至中性点；所述级联式变换器结构包括多个整流逆变模块，其前级为级联整流结构，后级为级联逆变结构；其中，首端整流逆变模块中级联整流结构的正端与某相交流电连接，首端整流逆变模块中级联逆变结构的正端与三相电机的某相交流电连接；
所述级联式变换器结构包括至少一个隔离模块，所述隔离模块设置在级联式变换器结构的首端；
当整流逆变模块的数量为3时，第二个整流逆变模块为三桥臂结构，第三个整流逆变模块为两桥臂结构；当整流逆变模块的数量大于3时，第二个以后的整流逆变模块均为两桥臂结构。
其中，每相输入通过电抗器与所述级联式变换器结构连接。所述隔离模块为隔离型DC-DC模块。当隔离模块的数量大于1时，所述隔离模块均设置在级联式变换器结构的首端同一侧。
进一步地，每个整流逆变模块的级联逆变结构的负端与所述中性点直连。使得输出侧的电位锁定至中性点，舍弃了不可用开关状态中部分桥臂的冗余开关管，避免输入输出之间受冗余开关状态影响产生电位差，保证输入三相与输出三相共N点，提高系统的可靠性。
在一示例中，如图3所示，级联式变换器结构包括三个级联的整流逆变模块，首端整流逆变模块为隔离模块，第二个整流逆变模块为三桥臂结构，第三个整流逆变模块为两桥臂结构，取消了部分桥臂结构，相对于图2的结构减少了级联变换器的3个桥臂及相应的开关管。
在一示例中，如图4所示，级联式变换器结构包括四个级联的整流逆变模块，首端整流逆变模块为隔离模块，第二个整流逆变模块为三桥臂结构，第三和第四个整流逆变模块为两桥臂结构，相对于图2的结构减少了级联变换器的5个桥臂及相应的开关管。当需要增加隔离模块时只需在首端的增加隔离模块，并串联在同一侧，当超过三模块时只需在下方增加两桥臂模块。
在一示例中，如图5所示，级联式变换器结构的输入侧端口分别连在三相交流电的一相和中性点N点上，输出侧的端口分别连在输出三相交流电机的一相和上N点上，实现输入输出共N点。当隔离模块为1，级联整流逆变模块数量为3时，以A相为例，输入单相电正端经电抗器L1与级联式变换器结构第1模块（隔离模块）的正端A1P相连，第1模块的整流结构的负端A1N与第2模块的整流结构的正端A2P相连，第2模块的整流结构的负端A2N与第3模块的整流结构的正端A3P相连，第3模块的整流结构的负端A3N与中性点N相连。
第1模块的逆变结构的正端B1P与三相电机的某相连接（），第1模块的逆变结构的负端B1N与第2模块的逆变结构的正端B2P相连，然后直连至所述中性点N，使得输出侧的电位锁定至中性点。另外两相的连接与A相相似，在此不进行赘述。本发明缩减了拓扑非隔离模块的部分开关管，降低了开关损耗管损耗，同时避免冗余开关状态对三相共N点的影响。
以上具体实施方式是对本发明的详细说明，不能认定本发明的具体实施方式只局限于这些说明，对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演和替代，都应当视为属于本发明的保护范围。
Claims (4)
1.三相共N点级联型简化隔离非隔离混合型电力电子变压器，其特征在于，每相输入通过级联式变换器结构连接至中性点；所述级联式变换器结构包括多个整流逆变模块，其前级为级联整流结构，后级为级联逆变结构；其中，首端整流逆变模块中级联整流结构的正端与某相交流电连接，首端整流逆变模块中级联逆变结构的正端与三相电机的某相交流电连接；
所述级联式变换器结构包括至少一个隔离模块，所述隔离模块设置在级联式变换器结构的首端；
当整流逆变模块的数量为3时，第二个整流逆变模块为三桥臂结构，第三个整流逆变模块为两桥臂结构；当整流逆变模块的数量大于3时，第二个以后的整流逆变模块均为两桥臂结构。
2.根据权利要求1所述的三相共N点级联型简化隔离非隔离混合型电力电子变压器，其特征在于，所述隔离模块为隔离型DC-DC模块。
3.根据权利要求1所述的三相共N点级联型简化隔离非隔离混合型电力电子变压器，其特征在于，当隔离模块的数量大于1时，所述隔离模块均设置在级联式变换器结构的首端同一侧。
4.根据权利要求1所述的三相共N点级联型简化隔离非隔离混合型电力电子变压器，其特征在于，每个整流逆变模块的级联逆变结构的负端与所述中性点直连。
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