CN204578377U - A kind of cascade-mixing transformation apparatus in parallel - Google Patents
A kind of cascade-mixing transformation apparatus in parallel Download PDFInfo
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Abstract
本实用新型公开了一种级联-并联混合变换器装置,由三相电源提供能源,通过切分变压器将电源分为三相,二次绕组的每一相电压被切分为若干个独立的低电压,这些独立电压分别经过单相-单相变换器,通过级联形成单相交流输出电压。而每相级联输出分别并联后经过LC滤波电路连接于负载,形成三相-单相变换器。所述功率单元模块为单相-单相PWM变换器,变换器可以是两电平结构,也可以是多电平结构。本实用新型的拓扑结构能使低压器件应用于高压场合,实现逆变器以较高的电压等级输出,还可增减级联、并联单元以满足不同的设计要求。输出端可接负载而被视为一个三相单相变换器;本实用新型亦可应用于电气化铁路如同相供电系统中,输出端可为牵引网供电,提供能源的三相电源A、B、C三相可共同分担负载或牵引网所需功率,且能量可双向流动。
The utility model discloses a cascade-parallel hybrid converter device, which is provided with energy by a three-phase power supply, divides the power supply into three phases through a split transformer, and divides the voltage of each phase of the secondary winding into several independent Low voltage, these independent voltages pass through single-phase-single-phase converters respectively, and form single-phase AC output voltage through cascading. The cascaded outputs of each phase are respectively connected in parallel and then connected to the load through an LC filter circuit to form a three-phase-single-phase converter. The power unit module is a single-phase-single-phase PWM converter, and the converter may have a two-level structure or a multi-level structure. The topology structure of the utility model can make the low-voltage device be applied to the high-voltage occasion, realize the output of the inverter at a higher voltage level, and increase or decrease the cascaded and parallel units to meet different design requirements. The output end can be connected to the load and can be regarded as a three-phase single-phase converter; the utility model can also be applied in the same phase power supply system of the electrified railway, the output end can supply power for the traction network, and provide energy for the three-phase power supply A, B, The three phases of C can jointly share the power required by the load or traction network, and the energy can flow in both directions.
Description
技术领域technical field
本实用新型涉及一种级联-并联混合变换器装置,尤其涉及一种用于电气化铁路的级联-并联混合变换器装置。The utility model relates to a cascade-parallel hybrid converter device, in particular to a cascade-parallel hybrid converter device for electrified railways.
背景技术Background technique
变换器通过电力电子技术进行电能变换,它利用晶闸管电路,将各类交流或直流电源输入转变为所需要的输出电压和频率稳定的交流输出。如今在电力系统、蓄电池的后备供电系统等领域的迅速发展也促使大容量变换器快速发展,大功率变换器的用途也日益广泛。对于电气化铁路设计而言也是如此,需要在逆变器侧输出足够大功率的电源以供机车顺利运行。应用于电气化铁路的变换器,其输出电能要求十分严格,如何能同时提高变换器容量并改善其输出电能的质量,是现代逆变技术的一个重要发展方向。因此对大功率变换器的电路拓扑结构进行研究,从而提高电力电子变换器容量并改善其输出电能质量,是十分具有研究意义的。The converter converts electric energy through power electronic technology. It uses thyristor circuits to convert various AC or DC power inputs into AC outputs with the required output voltage and frequency stability. Today's rapid development in the fields of power systems, battery backup power supply systems, etc. has also prompted the rapid development of large-capacity converters, and the use of high-power converters is also becoming more and more extensive. The same is true for electrified railway design, which needs to output a power supply with sufficient power on the inverter side for the smooth operation of the locomotive. Converters used in electrified railways have very strict output power requirements. How to simultaneously increase the capacity of converters and improve the quality of output power is an important development direction of modern inverter technology. Therefore, it is of great research significance to study the circuit topology of high-power converters, so as to increase the capacity of power electronic converters and improve the quality of their output power.
变换器级联具有串联的特性,可以由较小功率的模块提供输入,实现高压大功率输出,实现使低压器件应用于高压场合,变换器以较高的电压等级输出的功能。变换器的并联运行,不仅可实现功率合成,提高输出电流的等级,满足变换器系统大电流等级输出的要求,增加电源的容量,而且可以提高供电的可靠性。The cascading of converters has the characteristics of series connection, which can provide input from smaller power modules to achieve high-voltage and high-power output, and realize the function of applying low-voltage devices to high-voltage occasions and the converter outputs at a higher voltage level. The parallel operation of converters can not only realize power synthesis, increase the level of output current, meet the requirements of high current level output of the converter system, increase the capacity of power supply, but also improve the reliability of power supply.
在电气化铁路设计当中,供电系统输出电压只能到27.5kv,若需要继续增大变换器输出容量,光是继续增加级联单元便没意义了,这时可以考虑加入并联,提高输出电流,从而进一步增加变换器容量。In the design of electrified railways, the output voltage of the power supply system can only reach 27.5kv. If it is necessary to continue to increase the output capacity of the converter, it is meaningless to continue to increase the cascade units. At this time, you can consider adding parallel connections to increase the output current. Further increase the converter capacity.
实用新型内容Utility model content
本实用新型的目的就是提供一种级联-并联混合变换器拓扑结构,该拓扑结构具有控制方式灵活,输出电压的相位与幅值均可根据设备需要进行调节和控制,可根据工程实际需求进行变换器单元的拓展,而且输出电压谐波含量低,变换器工作效率较高,适和用于高压大功率输出等优点。The purpose of this utility model is to provide a cascade-parallel hybrid converter topology, which has a flexible control mode, and the phase and amplitude of the output voltage can be adjusted and controlled according to the needs of the equipment, and can be adjusted according to the actual needs of the project. The expansion of the converter unit, and the output voltage has low harmonic content, the converter has high working efficiency, and is suitable for high-voltage and high-power output.
本实用新型解决其技术问题,所采用的技术方案为:The utility model solves its technical problems, and the adopted technical scheme is:
一种级联-并联混合变换器装置,由三相电源提供能源,通过变压器将电源分为三相,二次绕组的每一相电压被切分为若干个独立的低电压,这些独立电压分别经过单相-单相变换器,通过级联形成单相交流输出电压;而每相级联输出分别并联后经过LC滤波电路连接于负载,形成三相-单相变换器,其具体连接方式为:A cascade-parallel hybrid converter device, which is powered by a three-phase power supply, and the power supply is divided into three phases through a transformer, and the voltage of each phase of the secondary winding is cut into several independent low voltages, and these independent voltages are respectively Through the single-phase-single-phase converter, the single-phase AC output voltage is formed by cascading; and the cascaded output of each phase is connected in parallel and then connected to the load through the LC filter circuit to form a three-phase-single-phase converter. The specific connection method is as follows: :
a、切分变压器一次侧绕组连接三相电源,二次侧绕组的每一相电压被切分为n个独立的低电压,以第一相电压为例,每一个独立的低电压均与相对应的功率单元模块连接,功率单元模块11至1n输出端依次级联,即功率单元模块11的输出负端口11N与功率单元模块12的输出正端口12P连接,功率单元模块12的输出负端口12N与功率单元模块13的输出正端口13P连接,以此类推;同理,第二、三相电压与功率单元模块连接方式与第一相相同。每一相功率模块级联后的输出端口分别为11P与1nN、21P与2nN、31与3n;a. The primary side winding of the split transformer is connected to the three-phase power supply. Each phase voltage of the secondary side winding is divided into n independent low voltages. Taking the first phase voltage as an example, each independent low voltage is connected to the phase The corresponding power unit modules are connected, and the output ends of the power unit modules 11 to 1n are cascaded in sequence, that is, the output negative port 11N of the power unit module 11 is connected to the output positive port 12P of the power unit module 12, and the output negative port 12N of the power unit module 12 It is connected to the positive output port 13P of the power unit module 13, and so on; similarly, the second and third phase voltages are connected to the power unit module in the same way as the first phase. The output ports after the cascaded power modules of each phase are 11P and 1nN, 21P and 2nN, 31 and 3n;
b、输出端11P、21P、31P端共同连接于P点,经滤波LC滤波电路后与负载或牵引网正端连接,输出端1nN、2nN、3nN端共同连接于N点,与负载或牵引网负端连接,实现三个单相交流输出电压的并联;b. The output terminals 11P, 21P, and 31P are connected to point P, and connected to the positive end of the load or traction network after being filtered by the LC filter circuit. The output terminals 1nN, 2nN, and 3nN are jointly connected to point N, and connected to the load or traction network. The negative terminal is connected to realize the parallel connection of three single-phase AC output voltages;
所述功率单元模块为单相-单相PWM变换器。The power unit module is a single-phase-single-phase PWM converter.
本实用新型级联-并联混合变换器,能使低压器件应用于高压场合,实现变换器以较高的电压等级输出,而变换器并联又能提高输出电流的等级,满足变换器系统大电流输出的要求。输出端可接负载,则本装置可视为一个三相-单相变换器;本装置亦可应用于电气化铁路如同相供电系统中,输出端可为牵引网供电,提供能源的三相电源A、B、C三相可共同分担负载或牵引网所需功率,且能量可双向流动。The cascaded-parallel hybrid converter of the utility model can make low-voltage devices applied to high-voltage occasions, realize the output of the converter at a higher voltage level, and the parallel connection of the converters can increase the level of the output current to meet the high-current output of the converter system requirements. The output terminal can be connected to the load, so this device can be regarded as a three-phase-single-phase converter; this device can also be used in the same-phase power supply system of electrified railways, and the output terminal can supply power for the traction network, providing energy for the three-phase power supply A Phases 1, B, and C can jointly share the power required by the load or traction network, and the energy can flow in both directions.
与现有技术相比,本实用新型的有益效果是:可视作一个三相-单相变换器,为不同的负载提供能源;对于电气化铁路而言,由于输出额定电压为27.5kv,无法通过继续提高输出电压等级满足负载更高的容量需求,故本实用新型在逆变侧级联的基础上对其拓扑结构加以改进,加入了并联结构,将变换器级联提升电压等级的优点与并联提升电流等级的优点相结合,实现大功率输出,满足不同设计需求。Compared with the prior art, the beneficial effect of the utility model is that: it can be regarded as a three-phase-single-phase converter to provide energy for different loads; for electrified railways, since the output rated voltage is 27.5kv, it cannot pass Continue to increase the output voltage level to meet the higher capacity demand of the load, so the utility model improves its topology structure on the basis of cascading on the inverter side, adds a parallel structure, and combines the advantages of cascading converters to improve the voltage level with parallel Combining the advantages of increasing the current level, it can achieve high power output and meet different design requirements.
附图说明Description of drawings
图1是本实用新型实施例的的电路原理图;Fig. 1 is the schematic circuit diagram of the utility model embodiment;
图2是基于两电平H桥结构的单相-单相PWM变换器;Figure 2 is a single-phase-single-phase PWM converter based on a two-level H-bridge structure;
图3是基于三电平二极管箝位结构的单相-单相PWM变换器。Figure 3 is a single-phase-single-phase PWM converter based on a three-level diode clamp structure.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本实用新型作进一步详细说明。The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.
图1是本实用新型的级联-并联混合变换器主电路图,由三相电源提供能源,通过切分变压器将电源分为三相,切分变压器一次侧绕组连接三相电源,二次侧绕组的每一相电压被切分为n个独立的低电压,如图1中UN1、UN2、UN3所示,以第1相电压为例,每一个独立的低电压均与相对应的功率单元模块连接,功率单元模块11至1n输出端依次级联,即功率单元11的输出负端口11N与功率单元12的输出正端口12P连接,功率单元12的输出负端口12N与功率单元13的输出正端口13P连接,以此类推。同理,第2、3相电压与功率单元模块连接方式与第1相相同。每一相功率模块级联后的输出端口分别为11P与1nN、21P与2nN、31与3n。输出端11P、21P、31P端共同连接于P点,经滤波LC滤波电路后与负载或牵引网正端连接,输出端1nN、2nN、3nN端共同连接于N点,与负载或牵引网负端连接,实现三个单相交流输出电压的并联。所述功率单元模块为单相-单相PWM变换器,变换器可以是两电平结构,如图2所示,也可以是多电平结构,如图3中三电平二极管箝位结构。Fig. 1 is the main circuit diagram of the cascade-parallel hybrid converter of the present invention, the energy is provided by the three-phase power supply, the power supply is divided into three phases through the split transformer, the primary side winding of the split transformer is connected to the three-phase power supply, and the secondary side winding Each phase voltage is divided into n independent low voltages, as shown in Figure 1 U N1 , U N2 , U N3 , taking the first phase voltage as an example, each independent low voltage corresponds to the corresponding The power unit modules are connected, and the output ends of the power unit modules 11 to 1n are cascaded in sequence, that is, the output negative port 11N of the power unit 11 is connected to the output positive port 12P of the power unit 12, and the output negative port 12N of the power unit 12 is connected to the output port 12N of the power unit 13. The output positive port is connected to 13P, and so on. Similarly, the connection method of the voltage of the second and third phases and the power unit module is the same as that of the first phase. The output ports after the cascaded power modules of each phase are 11P and 1nN, 21P and 2nN, 31 and 3n respectively. The output terminals 11P, 21P, and 31P are connected to point P, and connected to the positive end of the load or traction network after being filtered by the LC filter circuit, and the output terminals 1nN, 2nN, and 3nN are connected to point N, and connected to the negative end of the load or traction network. To realize the parallel connection of three single-phase AC output voltages. The power unit module is a single-phase-single-phase PWM converter, and the converter may have a two-level structure, as shown in FIG. 2 , or a multi-level structure, such as a three-level diode clamp structure in FIG. 3 .
本实用新型提出的级联-并联混合变换器,变换器级联能使低压器件应用于高压场合,实现变换器以较高的电压等级输出,而变换器并联又能提高输出电流的等级,满足变换器系统大电流输出的要求。输出端可接负载,则本装置可视为一个三相-单相变换器;本装置亦可应用于电气化铁路如同相供电系统中,输出端可为牵引网供电,提供能源的三相电源A、B、C三相可共同分担负载或牵引网所需功率,且能量可双向流动。The utility model proposes a cascade-parallel hybrid converter. The cascading of converters can make low-voltage devices be applied to high-voltage occasions, and realize the output of the converter at a higher voltage level, and the parallel connection of the converters can increase the level of output current to meet Requirements for large current output of the converter system. The output terminal can be connected to the load, so this device can be regarded as a three-phase-single-phase converter; this device can also be used in the same-phase power supply system of electrified railways, and the output terminal can supply power for the traction network, providing energy for the three-phase power supply A Phases 1, B, and C can jointly share the power required by the load or traction network, and the energy can flow in both directions.
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Cited By (2)
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CN104767393A (en) * | 2015-04-17 | 2015-07-08 | 西南交通大学 | A Cascade-Parallel Hybrid Converter Device |
CN112448593A (en) * | 2019-08-27 | 2021-03-05 | 中车株洲电力机车研究所有限公司 | Traction converter system |
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CN104767393A (en) * | 2015-04-17 | 2015-07-08 | 西南交通大学 | A Cascade-Parallel Hybrid Converter Device |
CN112448593A (en) * | 2019-08-27 | 2021-03-05 | 中车株洲电力机车研究所有限公司 | Traction converter system |
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