CN201323531Y - 6KV high-voltage transducer directly composed of three-level H-bridge power unit module - Google Patents

6KV high-voltage transducer directly composed of three-level H-bridge power unit module Download PDF

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CN201323531Y
CN201323531Y CNU2008202388702U CN200820238870U CN201323531Y CN 201323531 Y CN201323531 Y CN 201323531Y CN U2008202388702 U CNU2008202388702 U CN U2008202388702U CN 200820238870 U CN200820238870 U CN 200820238870U CN 201323531 Y CN201323531 Y CN 201323531Y
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level
connected
bridge
output
power
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CNU2008202388702U
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刘红星
姚广普
李洪林
杨德柱
蔡志刚
赵泽生
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郑州电力机械厂
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Abstract

The utility model relates to a 6KV high-voltage transducer directly composed of three-level H-bridge power unit modules. The transducer comprises a 36 pulse wave isolation transformer, three three-level H-bridge power unit modules (A, B and C) and a filtering wave output device, wherein the isolation transformer comprises a three-phase winding and six secondary windings; each two secondary windings form a group and are respectively connected with the rectification link of the three three-level H-bridge power unit modules; the rectification link of the three-level H-bridge power unit modules forms 36 filtering waves totally; the output end of the three three-level H-bridge power unit modules is connected with the corresponding input end of the filtering wave output device which is used for outputting the filtering waves of the voltage output by the three-level H-bridge power unit modules so as to obtain sine wave alternating current with relatively low harmonic wave content.

Description

由三电平H桥功率单元模块直接构成的6KV髙压变频器技术领域本实用新型属于电力拖动、电力变换及电力电子技术领域,具体涉及一种由三电平H桥功率单元模块直接构成的6KV高压变频器。 BACKGROUND Gao 6KV pressure from the three-level inverter H-bridge configuration of power cell module of the present invention is directly belongs to the electric drive, power conversion and power electronics technical field, particularly relates to a direct consists of a three-level H-bridge power module unit the 6KV high-voltage inverter. 背景技术在用电系统中,电机作为主要的动力设备而广泛地应用于工农业生产、 国防、科技、及社会生活等各个方面,在其中用于驱动风机、水泵、压縮机类负载的大容量中高压异步电动机同样数量巨大,具体应用在火力发电、冶金、石油、化工、水泥、矿山、城市供水等行业。 BACKGROUND In a power system, the motor as the main power equipment widely used in various industrial and agricultural production, national defense, science and technology, and social life, in which the drive for fans, pumps, compressors class load is large capacity equally huge number of high-voltage induction motors, the specific application in thermal power generation, metallurgy, petroleum, chemical, cement, mining, urban water supply and other industries. 在具体应用中,由于多年以来一直采用挡板和阀门来调节流量满足生产需求,不但造成了能量的严重浪费,而且对整个生产系统设备产生冲击和磨损。 In specific applications, since for many years we have been using a paddle and a valve to regulate the flow to meet production needs, not only caused a serious waste of energy, but also have an impact on the entire production system and equipment wear. 随着大功率电力电子技术的发展,高压变频器被日益应用在上述需要调速的领域,起到了显著的节能效果。 With the development of high-power electronic technology, high-voltage inverter is increasingly used in the fields above required speed, played a significant energy savings. 由于当前功率器件耐压等级的有限性,国内变频器主要采用两种拓扑结构。 Due to the limited nature of the current power breakdown voltage level, mainly in two domestic inverter topology. 一种是采用两电平H桥功率单元的串联多重化结构;另一种是采用功率器件串联的三电平结构。 One is the use of a two-level H-bridge power unit serial multiplex structure; the other is a three-level structure of the power device connected in series. 采用两电平H桥功率单元的串联多重化结构,其主要思路是采用耐压等级低的开关器件组成单元,然后单元串联获得高的电压输出。 Using two-level H-bridge power unit serial multiplex structure, the main idea is to use low-voltage level switching devices composed of unit cells connected in series and to obtain a high voltage output. 这种结构弥补了现有功率器件耐压能力的不足,但其使用的功率器件数量太多,装置的体积大,重量大。 This structure up for the lack of capacity of the existing power breakdown voltage, but use too many power devices, the size of the device is large, heavy weight. 同时因为单元数量多,需要的电源数量也多,使得所需的隔离变压器副边绕组数量和出线端多,高压电缆太多,系统内阻无形中增大。 And because the number of units, the number of required power also, so that the required isolation transformer secondary winding and the number of multi-outlet side, too high-voltage cables, the internal resistance of the system virtually increased. 接线太多,从而故障点也相应增多,可靠性降低。 Too many wiring, so that the point of failure is also a corresponding increase, lower reliability. 由于单元为两电平的H桥结构,其输出电压的^>^高,产生高的共模电压,对整个系统的耐压不利。 Since the cell structure is a two-level H-bridge, whose output voltage ^> ^ high, resulting in high common-mode voltage, the negative pressure of the whole system. 采用功率器件串联的三电平结构,输出电压的电平数少(相电压三电平, 线电压五电平),输出波形中不可避免地产生大的谐波分量,由于谐波的原因,电动机的功率因数和效率、甚至寿命都会受到一定的影响;同样其输出电压的"^4高,产生高的共模电压,对整个系统的耐压不利。由于现有功率器件的耐压水平限制,该结构中每个开关模块必须由两个甚至三个功率器件串联才能满足要求,由此带来串联功率器件的均压、均流问题以及控制串联功率器件开关的同步性问题,这两个问题是目前该种结构的核心问题,系统的可靠性也将受到影响,同时失去了三电平结构在均压方面的优势。发明内容本实用新型的目的正是针对上述现有技术中所存在的不足之处而提供一种由三电平H桥功率单元模块直接构成的6KV高压变频器。本实用新型采用三电平H桥拓扑结 Three-level structure of the power device in series, a small number of levels of the output voltage (phase voltage of three-level, five-level line voltage), the output waveform of the harmonic components generated large inevitably, due to harmonics, power factor and efficiency of the motor, even life will be affected to some degree; "^ 4 high, high common-mode voltage of the negative pressure of the system due to the same output voltage level of the conventional power voltage limiting device. , this configuration each switching module to be satisfied by two or three devices in series power requirements, thereby bringing the series power equalizing device, and the control flow problems are synchronization problems switching power devices connected in series, the two the problem is the core issue of this kind of structure, the reliability of the system will also be affected, but lost the three-level grading structure in terms of advantages. the present invention is precisely the purpose of the above-mentioned prior art exists for deficiencies and to provide high voltage inverter 6KV one kind of three-level H-bridge configuration of power cell module directly. the present invention uses a three-level H-bridge topology 作为功率模块,充分利用三电平技术的均压优点,依据目前功率元器件所能达到的耐压等级,将功率模块的输出电压作为变频器输出的一相电压,无需功率器件串联,输出电压可达到3900V,高于目前6KV高压电机的相电压3450V。 本实用新型的目的可通过以下技术措施来实现:本实用新型的目的由三电平H桥功率单元模块直接构成的6KV高压变频器包括36脉波隔离变压器、三个三电平H桥功率单元模块和输出滤波装置; 其中:隔离变压器包括原边三相绕组和副边六组绕组,副边每组绕组的输出电压相对于参考电压的相位依次为+ 25°、 +15°、 +5°、 -5°、 -15°、 -25°;副边每两个组绕为一组分别接三个三电平H桥功率单元模块的输入整流环节,三电平H桥功率单元模块的整流环节为两个6脉波整流桥串联组成的12脉波整流桥,三个三电平H桥功率单元模块的整流环节 As a power module, make full use of the three-level technical advantage of equalizing, based on the current power components achievable pressure rating, the output voltage of the power module as an inverter output phase voltage, no power devices connected in series, the output voltage up to 3900V, 3450V 6KV phase voltage higher than the current high-voltage electric machine object of the present invention can be achieved by the following technical measures:. 6KV high voltage inverter according to the present invention the object is achieved by a three-level H-bridge configuration of power cell module comprises direct pulse isolation transformer 36, three three-level H-bridge power module unit and an output filter means; wherein: the isolation transformer includes a primary winding and a secondary three-phase six sets of windings, each secondary winding of the output voltage with respect to a reference voltage the phases were + 25 °, + 15 °, + 5 °, -5 °, -15 °, -25 °; secondary winding each of the two groups are respectively connected to a group of three three-level H-bridge power module unit input rectifying part, 12 part-pulse rectifier bridge rectifier three-level H-bridge power unit module for two 6-pulse rectifier bridge in series, the three three-level H-bridge power module unit rectifying part 组成36脉波;所述三电平H桥功率单元模块输出端接输出滤波装置的相应输入端,输出滤波装置用于三电平H桥功率单元模块输出电压的滤波,得到谐波含量比较少的正弦波交流电。本实用新型中所述的三个三电平H桥功率单元模块完全相同,具有互换性;每个三电平H桥功率单元模块包括:整流环节、正、负向充电保护回路、 直流环节、限流环节、逆变环节。所述三电平H桥功率单元模块中的正向充电保护回路是由采用并联方式电连接的电子开关S。限流电阻R,和压敏电阻MY^且成;负向充电保护回路是由采用并联方式电连接的电子开关S2 、限流电阻R2和压敏电阻MY2组成。所述三电平H桥功率单元模块中的的逆变环节由两个三电平逆变桥臂并联组成:功率器件l、 Va2、 Va3、 l串联成一条支路,功率器件l、 Va6、 Va7、 Va8 串联成一条支路,快恢复二极管D^ i^串联 Composition 36 pulse; respective inputs of the three-level H-bridge power output termination module unit output filter means, the output filter means for filtering the three-cell module power level H-bridge output voltage, harmonic content is relatively small to give . AC sine wave in the present invention, the three three-level H-bridge power unit modules are identical, interchangeable; three-level H-bridge of each power cell module comprising: a rectifying part, positive, negative charge protection circuit, the DC link current limiting links, link inverter. the three-level H-bridge power unit module is positively charged by a protection circuit using an electronic switch connected in electrically parallel S. limiting resistor R, and the press sensitive resistor and so MY ^; negatively charged by the electronic protection circuit switch S2 is connected in parallel using electrical current limiting resistor R2 and the inverter composed of varistor MY2 three-level H-bridge of the power module unit. link consists of two three-level inverter bridge arms connected in parallel: the power device l, Va2, Va3, l series into one branch power device l, Va6, Va7, va8 series into one branch, the fast recovery diode D ^ i ^ series 一条支路,快恢复二极管Da3、 /\4串联成一条支路;由快恢复二极管D^ Z^串联构成的支路并接在功率器件l和Vc的节点与功率器件Va和V^的节点之间,由快恢复二极管D^、 Z)a4 串联构成的支路并接在功率器件V^和V^的节点与功率器件V^和V。 A slip, fast recovery diodes Da3, / \ 4 series into one branch; from fast recovery diode D ^ Z ^ branch node and connected in series in the power device l and node Vc Va power device and the V ^ between the fast recovery diode D ^, Z) a4 series branch composed and connected to the power device of the V ^ and V ^ V ^ power device node and V. 8的节点之间,用来实现零电平,构成两条中性点钳位型三电平桥臂;在快恢复二极管Dal、 Z^串联支路两端并接一个偏置电阻I^,在快恢复二极管D^ /^4串联支路两端并接一个偏置电阻R^,用以保证零电平时二极管D^或Z^处于导通状态, 使功率器件Val和Va2之间以及Va3和Va4之间实现均压,不需采取其他附加均压措施,从而减少电路损失;快恢复二极管031和化2的连接节点以及快恢复二极管Da3和Da4的连接节点都接至直流环节的中点;功率器件Va2和Va3的节点连接至其它两个功率单元的对应点,作为三个功率单元的星接中性点;功率器件V^ 和V^的节点连接至输出滤波电感,作为功率单元交流电压的输出。 Between the node 8, to achieve a zero level, constituting two neutral point clamped three-level bridge arm; fast recovery diodes in Dal, Z ^ across the series branch and a bias resistor connected to I ^, in the fast recovery diode D ^ / ^ 4 connected across the series branch and a bias resistor R ^, to ensure zero level or a diode D ^ Z ^ is in the oN state, the power device between Val and Va2 and Va3 and to achieve equalization between Va4, without taking other additional measures for equalizing, thereby reducing the circuit loss; fast recovery diode 031, and a connection node of the fast recovery diode 2 and a connection node Da3 and Da4 are connected to the midpoint of the DC link ; Va2 and Va3 power device is connected to the node corresponding to the other two points of the power unit, the power unit as a star connection three neutral point; power device V ^ V ^ and nodes connected to the output filter inductance, as the AC power unit the output voltage. 所述三电平H桥功率单元模块中的限流环节包括快恢复二极管D^ 、电容Cd、电容C。 Limiting aspects of the three-level H-bridge power unit module includes fast recovery diode D ^, the capacitor Cd, a capacitor C. 、快恢复二极管Dj衣次串联后与逆变环节(12)并联,快恢复二极管D^和电容C^的节点接吸收电阻Rd,快恢复二极管D。 , The node with the inverter part (12) in parallel, and a fast recovery diode capacitance C ^ D ^ after fast recovery diode connected in series Dj secondary coating absorbing resistor Rd, fast recovery diode D. ,与吸收电阻R。 , Absorbent resistance R. ,连接后一起与限流电感L。 After the connection with the current-limiting inductance L. ,并联,快恢复二极管D。 , Parallel, fast recovery diode D. ;和电容C。 ; And a capacitor C. 的节点接吸收电阻R。 Resistor connected nodes absorbent R. 2,快恢复二极管D。 2, fast recovery diode D. 与吸收电阻R^连接后一起与限流电感L。 After uptake of the connection with the resistor R ^ limiting inductor L. 2并联,由以上共同组成限流环节(10);快恢复二极管D。 2 in parallel, from the above link together to form flow restrictor (10); fast recovery diode D. 2、电容C。 2, the capacitance C. ;、电容C。 ; Capacitance C. . 快恢复二极管D。 Fast recovery diode D. ,依次串联后与逆变环节(13)并联,快恢复二极管D。 , In series with the (13) parallel inverter part, fast recovery diode D. ,和电容C。 , And capacitance C. 3的节点接吸收电阻R。 Access node 3 absorption resistance R. ,快恢复二极管D。 , Fast recovery diode D. 2与吸收电阻R。 2 absorbent resistor R. 2连接后一起与限流电感L。 2 after the connection with the current-limiting inductance L. ,并联,快恢复二极管0。4和电容(;4的节点接吸收电阻11。4,快恢复二极管D^与吸收电阻R^连接后一起与限流电感I^并联,由以上共同组成逆变环节(13)的限流环节(ll);两套限流环节共用两个电感L。,和L^电感L。i和L。的两端分别并接快速短路检测单元L和Tw,用于监测电感Ld和L。中的电流;电容Q和电容C。的节点以及电容C。3和电容C。,的节点都接至直流环节的中点。所述三电平H桥功率单元模块中的整流环节由两组6脉波二极管不控整流桥串联组成,两组整流桥的连接点作为直流环节的中点;直流环节由直流滤波电容q和C,串联组成,两个电容的节点连接两组整流桥的中点。本实用新型中所述输出滤波装置由电感4、 A、 ^和电容C。、 CA、 Cj勾成,每个电感Z。、 4、 4的一端分别串接一个电容C。、 &、 Ct,,另一端为输出滤波装置的输入端,电容的另一端连接在 , Parallel, fast recovery diode 0.4 and capacitor (; 4 absorbing resistor connected nodes 11.4, fast recovery diode D ^ and R ^ absorption resistor connected to the I ^ limiting inductor in parallel with the inverter composed of the above link (13) limiting links (LL); two limiting links shared L., and both ends of the inductor L ^ L. L.i and two inductors are connected and rapid short-circuit detection unit L and Tw, for L. current monitoring and the inductance Ld; and a capacitor C. the capacitance of the node Q and the capacitance and a capacitor C. C.3, the node connected to the midpoint of the DC-link three-level H-bridge power module unit. rectified by two sets of links 6-pulse diode rectifier bridge in series is not controlled, the connection point of two rectifier bridge as the midpoint of the dc link; dc link and a DC filter capacitor C q, in series, two capacitors connected to the node the midpoint of both bridges present invention said filtering means by the output inductor 4, a, ^ and a capacitor C., CA, Cj hook into each inductance Z., 4, 4 are connected in series at one end a capacitance C., &, Ct ,, the other end to an input terminal of the output filter means, connected to the other end of capacitor 一起成为中性点N,中性点N接大地;电感和电容的连接点作为输出滤波装置的输出端,即变频器的输出端"、K『;在输出C/、 K『的线间即t/F、 FPF、 WU间分别跨接压敏电阻MYab、 MYb。、 MY^等,用于防止输出端的过电压对功率单元的冲击。本实用新型主要由三个三电平H桥功率单元模块构成的高压变频器,充分利用了两电平H桥功率单元串联多重化结构变频器模块化的思想,同时优于两电平H桥功率单元串联多重化结构变频器。 一个单元输出电压由两电平提高到三电平,采用现有的高压功率元器件,无需单元串联就能满足当前高压电机的工作电压。输出线电压可达6.9KV。如需应用于更高电压等级,还可利用串联多重化结构变频器的思想将三电平H桥功率单元模块串联应用, 相比两电平H桥功率单元串联多重化结构变频器,达到同样的输出电压等级, 所需电源 Together as a neutral point N, N earthed neutral point; inductance and a capacitance connected as an output of the output point of the filter means, i.e., the output of inverter ", K"; the output C /, between K "lines i.e. between t / F, FPF, WU varistor connected across MYab, mYb., MY ^ the like, for preventing the impact of over-voltage to the output terminal of the power unit. the present invention consists of three three-level H-bridge power unit high-voltage inverter modules, the full use of the two-level H-bridge power converter unit serial multiplex idea of ​​modular structure, while better than the two-level H-bridge power converter unit serial multiplex structure. cell output voltage produced by a two raised to the level of the three-level, the use of existing high-voltage power components, no cells in series can meet the operating voltage of the motor current high voltage output line voltages up to 6.9 kV. For higher voltage level is applied, may also be using a serial multiplex structure is thought to drive a three-level H-bridge power application unit modules connected in series, the serial multiplex structure compared to the two-level inverter H-bridge power unit, to achieve the same output voltage level, power required 数可减少一半,而且输出电压电平数相同。本实用新型的有益效果如下-(1) 提供了一种利用现有耐压等级的大功率元器件无需串联使用直接构成高压变频器,输出无需升压装置。(2) 单元模块化有利于系统的互换性,方便系统扩展,以适用更多场合的使用。(3) 功率单元的充电和保护回路合二为一,变频器上电时电子开关断开有利于缓解直流滤波电容的充电电流,利用电子开关的快速性在系统故障时能够对单元进行快速保护,系统正常工作状态下电子开关维持通态的低损耗有利于提高系统效率。(4) 功率单元的逆变回路用偏执电阻解决了功率器件的均压问题,不需其他附加动静态均压措施,减少了电路损失。 Number can be reduced by half, and output the same number of voltage levels of the beneficial effects of the present invention is as follows - (a) providing a pressure rating of the existing high-power components constituting the high-voltage inverter directly without the use of a series, output without when boost device. (2) facilitate interchangeability of the modular units of the system, to facilitate system expansion, more suitable to use the occasion of charging and a protection circuit (3) combined power unit, the power converter electronic switch off will help alleviate the DC filter capacitor charging current, the cell can be quickly protected utilizing rapid failure of the electronic switching system, the system under normal operating conditions the electronic switch to maintain the low-loss-state help improve the system efficiency. (4) an inverter circuit of the power unit with the power device paranoid resistor solves the problem of pressure equalization, without any additional static and dynamic pressure equalization measures to reduce the loss of the circuit. (5) 功率单元的两套限流环节共用一套限流电感,系统结构简单,方便进行故障检测;限流环节的电容分立有利于减少线路的杂散电感对功率器件开关的影响,装置结构紧促,使线路的杂散电感降低至最低。 (5) two-link power limiting unit limiting inductor, a common, simple structure, to facilitate fault detection; limiting aspects of discrete capacitance helps to reduce the effects of stray inductance of the line of the power switching device, the device structure pressed for the stray inductance line is reduced to a minimum.

附图说明 BRIEF DESCRIPTION

图1为三电平H桥功率单元模块原理图。 Figure 1 is a three-level H-bridge power cell module diagram.

图2为3个三电H桥功率单元构成的三相逆变器原理图。 FIG 2 is a three-phase three-level inverter Schematic H-bridge power units.

图3为扩展的每相2个三电平H桥功率单元串联构成的三相逆变器原理图。 FIG 3 is a schematic diagram of the extended three-phase inverter 2 for each phase three-level H-bridge configuration of power cells connected in series.

图4为三电平H桥功率单元直接构成的6KV高压变频器的拓扑结构图。 FIG 4 is a topology diagram of the high voltage inverter 6KV three-level H-bridge configuration of power cell directly. 图5为三电平H桥功率单元直接构成的6KV高压变频器的结构原理框图。 FIG 5 is a schematic block diagram showing a configuration of high-voltage inverter 6KV three-level H-bridge configuration of power cell directly. 图6为三电平H桥功率单元模块拓扑结构图。 FIG 6 is a three-level H-bridge topology power cell module of FIG. 图7为输出滤波装置拓扑结构图。 7 is a configuration diagram of an output filter means topology.

具体实施方式 Detailed ways

本实用新型以下将结合实施例(附图)作进一步说明: The present invention in conjunction with the following embodiments (figures) will be further described:

如图4、 5所示,该变频器包括一个36脉波隔离变压器(1)、三个完全相同的独立的三电平H桥功率单元模块A (2)、 B (3)、 C (4)和一组输出滤波装置(5);输入交流电经隔离变压器移相变压后得到六组三相交流电源, 其中每组交流电源的线电压为1920V,其中每两组为一组分别供给三个独立的三电平H桥功率单元模块;交流电在功率单元模块内部经过整流逆变后输出, 其中一端输出5电平相电压,另一端为公共端,三个单元的输出公共端星接在一起;单元输出的5电平相电压经过输出滤波装置后变为规则的正弦波给负载电机供电。 4, 5, the frequency converter comprises a pulse isolation transformer 36 (1), three identical separate three-level H-bridge power unit module A (2), B (3), C (4 ) and a set of output filtering means (5); an input AC isolation transformer by six sets of three-phase AC power obtained after phase shifting transformer, wherein each AC power line voltage is 1920V, wherein each of the three groups were fed as a group independent three-level H-bridge power module unit; AC inverter output is rectified in the power unit inside the module, wherein one end of the output phase voltage level of 5, and the other end to a common terminal, the common terminal of the output unit is connected to three stars together; 5-level unit outputs a sine wave voltage through a phase rule becomes the output filtering means after power to the load of the motor.

如图6所示,每一个功率单元都包括整流环节、充电保护环节、直流环节、限流环节和逆变环节等。 6, each power cell comprises a rectifying part, a charging protection link, the DC link, the inverter and limiting link links the like.

由隔离变压器副边来的两组错位移相的三相交流电源进入功率单元后, 分别进入两组六脉波二极管不控整流环节(A ~ A和D7 ~ D12 ),两组整流桥的输出端串联构成12脉波整流电路,输出12脉波的直流电,输出电压为(5〜6) KV。 After the isolation transformer secondary side by the displacement of the two-phase fault phase AC power supply into a power unit, respectively, into two six-pulse diode controlled rectifier part (A ~ A and D7 ~ D12), the two outputs of the rectifier bridge end of the series 12-pulse rectifier circuit constituting the output 12 of the DC pulse, the output voltage (5~6) KV. 保证每个单元的输出电压有效值能达到3900V。 Ensure RMS output voltage of each cell can be achieved 3900V. 由整流环节输出的直流电进入充电保护环节。 DC output from the rectifier into the charging part of the protective part. 电子开关S,、限流电阻R^口压敏电阻MY,并联组成正向充电保护回路;电子开关S,、限流电阻112和压敏电阻MY,并联组成负向充电保护回路。 Electronic switch S ,, current limiting resistor R ^ port varistor MY, the positive charge protection circuit connected in parallel; electronic switch S ,, current limiting resistor 112 and varistor MY, protection circuit connected in parallel to the negative charge. 在系统上电时,电子开关S,、 S,关断, 整流后的直流电流流经限流电阻R。 In the system is powered, the electronic switch S ,, S, is turned off, the rectified DC current flows through limiting resistor R. R2对直流环节电容C,和C,进行充电,用于减小上电瞬间涌流对系统的冲击;在系统正常工作时,电子开关S。 R2 of the DC link capacitor C, and between C, charging for reducing the impact on the instantaneous power surge to the system; when the system normal operation, the electronic switch S. S,开通, 减小工作时的电压损失;在系统故障时,电子开关&、、能够快速关断,迅速切换到小电流充电模式,用以保护整个后续系统;压敏电阻MY。 S, turn, reduces the voltage loss of work; system failure, the electronic switch is turned off quickly ,, & rapidly charging current is switched to, subsequent to protect the entire system; Varistor MY. M、用于保护电子开关S。 M, for the protection of the electronic switch S. ^免受高电压冲击。 ^ From high voltage surges.

直流环节电容C,和&用以对12脉波的直流电进行滤波和储能,得到更为平滑稳定的直流电源;两个电容的连接节点与整流环节的两个整流桥的连接点相连,作为整个功率单元的中性点,用以对直流电进行钳位,得到三电平的直流电。 DC link capacitor C, and between 12 &-pulse direct current for filtering and energy storage, to obtain a more smooth and stable DC power; the rectifier is connected to a connection node of the two capacitors of the two links rectifier bridge connection points, as the neutral point of the whole power unit to be clamped direct current, to obtain a three-level DC.

经直流环节钳位滤波的直流电,正极和负极分别进入正负向的限流环节, 中性点接逆变环节的中性点。 Clamped by the DC link filter DC, respectively to the positive and negative electrodes to the positive and negative limiting aspect, the neutral point connection of the inverter neutral point links. 电感L。 Inductance L. ,和I^用于限制电路中的电流变化率,缓解大电流对逆变环节的冲击。 , And I ^ used to limit the rate of change of current in the circuit, to alleviate the impact of large current link inverter. 快速短路检测单元Tv3和Tv4通过检测电感L。 And rapid short-circuit detection unit Tv3 Tv4 by detecting the inductance L. ,和L。 And L. 两端的电压变化,用于监测电感L。 Voltage change across, for monitoring inductance L. ,和I^中的电流变化, 一旦系统故障产生过电流,检测单元Tw和L能够迅速送出信号给保户环节的电子开关S,、 S,对系统进行保护。 Current change, and I ^ is, once the system fault overcurrent detection unit Tw and the L signal is sent quickly to the electronic switch link policy holders S ,, S, protect the system. 电阻R。 Resistance R. ,、 R。 ,, R. 2、 R。 2, R. 3、 R。 3, R. ,用于消耗电感L。 For consumption inductance L. ,和I^中电流变化所产生的能量,和电容C。 The energy and current change I ^ produced, and a capacitor C. . C。 C. 2、 C。 2, C. 3、 C。 3, C. ,一起来维持系统工作时直流电压的稳定,电阻和电容分别和两个逆变桥安装在一起,有利于减少线路的杂散电感对功率器件开关的影响,装置结构紧促,使线路的杂散电感降低至最低。 , Together DC voltage stabilization, resistors and capacitors are mounted and two inverter bridge work together to maintain the system, helps to reduce the effects of stray inductance of the line of the power switching device, the device structure pressed for the hybrid line San inductance is reduced to a minimum.

逆变环节由两个三电平逆变桥臂并联组成:功率器件Va,、 Va2、 Va3、 乂4串联成一条支路,功率器件、、Va6、 Va7、 l串联成一条支路,快恢复二极管D^ & 串联成一条支路,快恢复二极管D^、化4串联成一条支路。 The inverter part by two three-level inverter bridge arms connected in parallel: the power device Va ,, Va2, Va3, 4 qe series into one branch power device ,, Va6, Va7, l series into one branch, fast recovery D ^ & diodes in series into one branch, fast recovery diodes D ^, into a series of four branches. 由快恢复二极管Dal、 A3串联构成的支路并接在功率器件V^和V^的节点与功率器件V"和V^的节点之间,由快恢复二极管D"、仏串联构成的支路并接在功率器件、和VJ勺节点与功率器件V。 A fast recovery diode Dal, A3, and the series branch composed of a power device connected to the V ^ and V ^ power device node V "between a node and the V ^, a fast recovery diode D", composed of the series branch Fo and connected to the power device, and VJ spoon node power device V. 和V^的节点之间,用来实现零电平,构成两条中性点钳位型三电平桥臂。 And a node between the V ^, used to implement a zero level, constituting two neutral point clamped three-level bridge arm. 在快恢复二极管D^ i^串联支路两端并接一个偏置电阻R^ 在快恢复二极管D^ Z^串联支路两端并接一个偏置电阻R",用以保证零电平 In the fast recovery diode D ^ i ^ connected across the series branch and a bias resistor R ^ in the fast recovery diode D ^ Z ^ connected across the series branch and a bias resistor R ", in order to ensure a zero level

9时二极管Dal或Da3处于导通状态,使功率器件Val和Va2之间以及Va3和Va4之间实现均压,不需采取其他附加均压措施,从而减少电路损失。 9:00 diodes Da3 Dal or in a conductive state, so to achieve pressure equalization between the power devices and Val Va2 and Va3 and Va4 of, equalizing need to take any additional measures to reduce the loss of the circuit. 快恢复二极管D^和^的连接节点以及快恢复二极管D"和^的连接节点都接至直流环节的中点。功率器件V^和Vu的节点连接至其它两个功率单元的对应点,作为三个功率单元的星接中性点;功率器件V^和^的节点连接至输出滤波电感,作为功率单元交流电压的输出。 Fast recovery diode D ^ ^ and a connection node and the fast recovery diode D "^ and connection node connected to the midpoint of the DC link. ^ V power devices and Vu is the other node is connected to two corresponding points of the power unit, as three star connected neutral point of the power unit; ^ and ^ V power device node is connected to the output filter inductor, the output AC voltage as the power unit.

如图7所示,三个三电平H桥功率单元的电压输出接入输出滤波装置, 用于三电平H桥功率单元模块输出电压的滤波,经过ZC滤波得到谐波含量比较少的正弦波交流电给负载电机供电。 As shown, the output voltage of the output filtering means access three three-level H-bridge power unit, for filtering a three-level H-bridge power cell module of the output voltage, the harmonic content obtained after filtering ZC less sinusoidal 7 wave alternating current power to the load motor. 输出滤波装置由电感4、 A、 A和电 Filtering means output inductor 4, A, A, and electrical

容c。 Yung c. 、 cA、 c;构成,每个电感4、 A、 4的一端分别串接一个电容c。 , CA, c; configuration, each of the inductors 4, A, one end of a capacitor 4 are connected in series c. 、 cA、 c;, , CA, c ;,

另一端为输出滤波装置的输入端,电容的另一端连接在一起成为中性点N,中 The other end of input terminal of the output filter means, the other end of the capacitor are connected together to form a neutral point N, the

性点N接大地;电感和电容的连接点作为输出滤波装置的输出端,即变频器 Of N earthed points; inductance and a capacitance connected as an output point of the filter means output, i.e., the inverter

的输出端"、7、『;在输出f/、 F、『的线间即Vr、 ,、 WU间分别跨接压敏电阻MYa、 MYb。、 MY。a等,用于防止输出端的过电压对功率单元的冲击。 The output ", 7"; i.e., between the output Vr f /, F, "the line between WU ,, varistor connected across MYa, MYb, MY.a the like, for preventing the output of overvoltage. impact on the power unit.

如图1所示,三电平H桥功率单元模块采用二极管钳位三电平逆变器技术,由两个三电平桥臂并联构成一个功率单元,单元输出可以得到五电平电压,其中左桥臂的输出电压为C/。 As shown, a three-level H-bridge power module unit using a diode clamped three-level inverter technology, a power unit constituted by the three-two bridge legs connected in parallel, the output unit can be a five-level voltage, wherein the output voltage of the left arm of C /. ,右桥臂的输出电压为仏,左、右桥臂均采用SP『M控制。 , The output voltage of the right arm is Fo, the left and right arm are used SP "M control. 载波采用反相三角波层叠方式。 By reverse-phase triangular wave carrier in a layered manner. 左桥臂的三角载波初相角为, 右桥臂的三角载波初相角为"2,其中:《2 = «1 + 180。,左、右桥臂采用反相的正弦波作为调制波,以使左、右桥臂的输出电压"。 First left arm of the triangular carrier phase angle, the beginning of the right leg of the triangular carrier wave phase angle is "2, wherein:" = 2 «+ 180. 1, the left and right leg as a reverse-phase sine wave modulation, so that the left and right leg of the output voltage. " 和^具有大小相等相位相反的基波电压以便于叠加。 ^ Equal and opposite in phase with the fundamental voltage magnitude so as to be superimposed.

与二电平H桥功率单元相比:(1)输出同样的电平数,三电平功率单元所需的独立直流电源个数减少一半;(2)当独立电源的电压等级相同时,三电平功率单元的元器件承受电压降低一半;(3)输出电压相同时,当用三电平功率单元组成时,所需单元数减少一半;(4)输出电平数较多时,电路简单,控制简单。 Compared with the two-level H-bridge power unit: (1) the same output level number, the number of independent DC power supply required for three-level power unit is reduced by half; (2) when the voltage level of the power supply independent of the same, three Component level power cell withstand voltage reduced by half; (3) the output voltage with the same time, when the composition of a three-level power unit, the required number of units is reduced by half; when more (4) the number of output level, the circuit is simple, control is simple.

将三电平功率单元其中一个桥臂的输出作为公共端,另一桥臂输出当作三相电压的一相输出,由三个三电平功率单元可组成最简三相逆变器,输出电平数相电压5电平,线电压9电平(如图2所示)。 Wherein the output leg of a three-level power unit as a common end and the other arm of the three-phase voltage output as a phase output, a three-level three power units may constitute the simplest three-phase inverter output 5 number of levels with the voltage level of the line voltage level 9 (Figure 2). 该逆变器采用模块化结构紧凑型设计,可以实现最优的多电平输出,输出同样的电平数,所需元器件的耐压等级低,器件数量少,控制简单。 The inverter compact modular design, can achieve an optimal multi-level output, the output level of the same number, the desired level of low-voltage components, a small number of devices, the control is simple. 还可进行单元串联扩展,以达到更高的输出电压等级(如图3所示)。 Cells in series can also be extended to higher output voltage level (Figure 3).

Claims (7)

1、一种由三电平H桥功率单元模块直接构成的6KV高压变频器,其特征在于:该变频器包括36脉波隔离变压器、三个三电平H桥功率单元模块(A、B、C)和输出滤波装置;其中:隔离变压器包括原边三相绕组和副边六组绕组,副边每组绕组的输出电压相对于参考电压的相位依次为+25°、+15°、+5°、-5°、-15°、-25°;副边每两个组绕为一组分别接三个三电平H桥功率单元模块的输入整流环节,三电平H桥功率单元模块的整流环节为两个6脉波整流桥串联组成的12脉波整流桥,三个三电平H桥功率单元模块的整流环节共组成36脉波;所述三电平H桥功率单元模块输出端接输出滤波装置的相应输入端,输出滤波装置用于三电平H桥功率单元模块输出电压的滤波,得到谐波含量比较少的正弦波交流电。 1 A high voltage converter 6KV a three-level H-bridge configuration of power cell module directly, wherein: the frequency converter comprises a pulse isolation transformer 36, three three-level H-bridge power module means (A, B, C) and an output filter means; wherein: the isolation transformer includes a primary winding and a secondary three-phase six sets of windings, each secondary winding relative to the phase of the output voltage of the reference voltage were + 25 °, + 15 °, + 5 °, -5 °, -15 °, -25 °; secondary winding each of the two groups are respectively connected to a group of three three-level H-bridge power module input rectifier unit link, a three-level H-bridge power module unit rectification part two 6-pulse rectifier bridge 12 coupled in series to the pulse-wave rectifier bridge, three three-level H-bridge rectifier link power cell module comprising a total of 36 pulse; the three-level H-bridge power output of the module unit filtering means connected to the output of the respective input terminals, filtering means for filtering the output of a three-level H-bridge power cell module of the output voltage, harmonic content to give relatively small sine wave AC.
2、 根据权利要求1所述的变频器,其特征在于:三个三电平H桥功率单元模块(A、 B、 C)完全相同,具有互换性;每个三电平H桥功率单元模块包括:整流环节、正、负向充电保护回路、直流环节、限流环节、逆变环节。 2, the frequency converter according to claim 1, wherein: three three-level H-bridge power module means (A, B, C) are identical, interchangeable; each of the three-level H-bridge power unit module comprising: a rectifying part, positive, negative protection circuit, the DC link current limiting links, links to the charging inverter.
3、 根据权利要求1所述的变频器,其特征在于:所述输出滤波装置由电感丄。 3, the frequency converter according to claim 1, wherein: said filtering means by the output inductor Shang. 、A、 4和电容c。 , A, 4 and capacitance c. 、 CA、 C,构成,每个电感丄。 , CA, C, configured, each inductor Shang. 、A、 ^的一端分别串接一个电容C。 , A, one end of a capacitor connected in series, respectively ^ C. 、 C&、 C£,另一端为输出滤波装置的输入端,电容的另一端连接在一起成为中性点N,中性点N接大地;电感和电容的连接点作为输出滤波装置的输出端,即变频器的输出端K r、『;在输出"、F、『的线间即f/r、 ,、 WU间分别跨接压敏电阻MY^ MYb。、 MY。a等,用于防止输出端的过电压对功率单元的冲击。 , C &, C £, and the other end to an input terminal of the output filter means, the other end of the capacitor are connected together to form a neutral point N, N earthed neutral point; inductance and a capacitance connected as an output of the output point of the filter means, i.e., the inverter output K r, ';. between output ", F," i.e., a line f / r, ,, among WU connected across the varistor MY ^ mYb, MY.a the like, for preventing the output impact overvoltage end of the power unit.
4、 根据权利要求2所述的变频器,其特征在于:所述三电平H桥功率单元模块中的正向充电保护回路是由采用并联方式电连接的电子开关S。 4. The frequency converter according to claim 2, characterized in that: said three-level H-bridge power module unit positively charged electron switch protection circuit is electrically connected in parallel using S. 限流电阻R,和压敏电阻MY,组成;负向充电保护回路是由采用并联方式电连接的电子开关S,、限流电阻R2和压敏电阻M^组成。 Limiting resistor R, and the varistor MY, composition; negative protection loop is formed by an electronic switch S is electrically connected in parallel using the charging current limiting resistor R2 ,, and M ^ varistor composition.
5、 根据权利要求2所述的变频器,其特征在于:所述三电平H桥功率单元模块中的的逆变环节由两个三电平逆变桥臂并联组成:功率器件Val、 Va2、 1、 、4串联成一条支路,功率器件V^ Va6、 Va7、 、8串联成一条支路, 快恢复二极管D^、""串联成一条支路,快恢复二极管D"、 Z^串联成一条支路;由快恢复二极管D^、马2串联构成的支路并接在功率器件^和^2的节点与功率器件V"和l的节点之间,由快恢复二极管D"、 A,串联构成的支路并接在功率器件\5和^6的节点与功率器件1和^的节点之间,用来实现零电平, 构成两条中性点钳位型三电平桥臂;在快恢复二极管D^ A2串联支路两端并接一个偏置电阻R^,在快恢复二极管D^、 i^串联支路两端并接一个偏置电阻Ra2,用以保证零电平时二极管Da,或Z^处于导通状态,使功率器件l和V"之间以及、3和、4之间实现均压,不需采取其 5. The frequency converter according to claim 2, characterized in that: an inverter part of a three-level H-bridge of the power module unit consists of two three-level inverter bridge arms connected in parallel: the power device Val, Va2 , 1,, 4 series into one branch of the power device V ^ Va6, Va7,, 8 series into one branch, fast recovery diodes D ^, "" series into one branch, the fast recovery diode D ", Z ^ series into a branch; from fast recovery diode D ^, horse branch 2 connected in series and the power device and ^ ^ V 2 nodes of the power device "between the nodes and l, the fast recovery diode D", a , and branch connected in series between the power device 5 and node ^ ^ \ 6 of node 1 and the power device, used to achieve a zero level, constituting two neutral point clamped three-level bridge arm ; in the fast recovery diode D ^ A2 connected across the series branch and a bias resistor R ^, the fast recovery diode D ^, i ^ connected across the series branch and a bias resistor Ra2, to ensure zero level diode Da, or Z ^ is in the oN state, so that between the "l and V, and the power device, and 3, to achieve pressure equalization between 4, which need to take 附加均压措施,从而减少电路损失;快恢复二极管DJP Da2的连接节点以及快恢复二极管D"和化4的连接节点都接至直流环节的中点;功率器件V^和V"的节点连接至其它两个功率单元的对应点,作为三个功率单元的星接中性点;功率器件V^和Vw的节点连接至输出滤波电感,作为功率单元交流电压的输出。 Equalizing additional measures to reduce the loss of the circuit; fast recovery diode connection node DJP Da2 and fast recovery diode D "of the connection node and 4 are connected to the midpoint of the DC link; power device V ^ and V" is connected to a node corresponding to the other two points of the power unit, the power unit as a star connection three neutral point; V ^ and the power device connected to the output node Vw filter inductor, an output AC voltage of the power unit.
6、 根据权利要求2所述的变频器,其特征在于:所述三电平H桥功率单元模块中的限流环节包括快恢复二极管D。 6, the frequency converter according to claim 2, wherein: said flow restrictor link three-level H-bridge power unit module includes fast recovery diode D. ,、电容C。 ,, capacitor C. ,、电容(:。2、快恢复二极管D。依次串联后与逆变环节(12)并联,快恢复二极管D。,和电容C。,的节点接吸收电阻R。"快恢复二极管D。,与吸收电阻R。,连接后一起与限流电感L。,并联,快恢复二极管^和电容C。的节点接吸收电阻Re2,快恢复二极管D。与吸收电阻R。连接后一起与限流电感L。并联,由以上共同组成限流环节(10); 快恢复二极管D。、电容C^、电容C。。快恢复二极管D。4依次串联后与逆变环节(13)并联,快恢复二极管D。2和电容C。3的节点接吸收电阻R^快恢复二极管D。与吸收电阻R。连接后一起与限流电感L。,并联,快恢复二极管D。,和电容Q的节点接吸收电阻R^ ,快恢复二极管0。4与吸收电阻11。4连接后一起与限流电感k并联,由以上共同组成逆变环节(13)的限流环节(11);两套限流环节共用两个电感I^和L。2;电感、和L。2的两端分别并接快速短路 ,, capacitor (: .2, fast recovery in parallel with the inverter part (12) in series after the diode D., D. fast recovery diode, and a capacitor C., then node absorption resistance R. "fast recovery diode D., absorbent resistor R., and limiting inductor L., parallel, fast recovery diodes are connected together and a capacitor C. ^ nodes connected resistor Re2 and absorption, fast recovery diode D. absorbent with the limiting inductor connected resistor R. L. parallel flow restrictor composed of the above aspects (10); fast recovery diode D., capacitance C ^, the capacitor C connected in parallel with the inverter .. fast recovery part (13) after D.4 diodes in series, fast recovery diode C.3 node capacitance and D.2 absorbing contact resistance R ^ fast recovery diode D. absorbent connection with the resistor R. the current limiting inductor L., parallel, fast recovery diode D., and a capacitor connected to a node Q absorbent resistor R ^, fast recovery diode resistor 0.4 11.4 absorbent connection with k limiting inductor in parallel, the inverter composed of the above aspect (13) of the flow restrictor part (11); two limiting links shared and two inductors I ^ L.2; inductance, and both ends are respectively connected fast L.2 shorting 测单元L和L,用于监测电感I^和L。中的电流;电容C。,和电容C。的节点以及电容C。3和电容C。4的节点都接至直流环节的中点。 Sensing unit L and L, the inductor current I ^ and L. monitor is used; C. capacitance, and the capacitance of nodes and node capacitance C. C.3 and C.4 capacitors are connected to the midpoint of the DC link.
7、 根据权利要求2所述的变频器,其特征在于:所述三电平H桥功率单元模块中的整流环节由两组6脉波二极管不控整流桥串联组成,两组整流桥的连接点作为直流环节的中点;直流环节由直流滤波电容C,和C,串联组成, 两个电容的节点连接两组整流桥的中点。 7, the frequency converter according to claim 2, wherein: the rectifying part of the three-level H-bridge power module unit consists of two 6-pulse diode bridge in series non-controlled rectifier connected to two rectifier bridge point as the midpoint of the DC link; dc link by the DC filter capacitor C, and between C, in series, two capacitors connected to the midpoint of the two nodes of the bridge rectifier.
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CN102035402A (en) * 2010-11-24 2011-04-27 中国船舶重工集团公司第七一二研究所 Integrated gate-commutated thyristor (IGCT)-based hybrid cascaded H-bridge multi-level high-voltage inverter
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CN102035402A (en) * 2010-11-24 2011-04-27 中国船舶重工集团公司第七一二研究所 Integrated gate-commutated thyristor (IGCT)-based hybrid cascaded H-bridge multi-level high-voltage inverter
CN102035402B (en) 2010-11-24 2013-01-30 中国船舶重工集团公司第七一二研究所 Integrated gate-commutated thyristor (IGCT)-based hybrid cascaded H-bridge multi-level high-voltage inverter
CN102255312A (en) * 2011-06-29 2011-11-23 安徽省电力科学研究院 Method for inhibiting switch burrs of back-to-back harmonic source
CN102355195A (en) * 2011-10-24 2012-02-15 乔鸣忠 Multi-inverter module paralleling frequency conversion device for transmission system and control policy
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CN103219909A (en) * 2013-03-29 2013-07-24 上海交通大学 Integrated gate commutated thyristor five-level power module
CN103178721A (en) * 2013-04-07 2013-06-26 冶金自动化研究设计院 High-capacity five-level converter power cabinet
CN103178721B (en) * 2013-04-07 2015-09-02 冶金自动化研究设计院 A kind of high-capacity five-level converter power cabinet
CN104883075A (en) * 2015-06-26 2015-09-02 西安交通大学 Novel cascaded 6kV mining high-voltage explosion-proof frequency converter
CN105610310A (en) * 2015-12-28 2016-05-25 深圳市库马克新技术股份有限公司 Frequency converter drive circuit and short-circuit detection method therefor
CN105610310B (en) * 2015-12-28 2018-12-21 深圳市库马克新技术股份有限公司 Transducer drive circuit and its method for detecting short circuit
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