WO2016086459A1 - Traction converter of bus voltage detection circuit having double voltage sensor - Google Patents

Traction converter of bus voltage detection circuit having double voltage sensor Download PDF

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WO2016086459A1
WO2016086459A1 PCT/CN2014/094052 CN2014094052W WO2016086459A1 WO 2016086459 A1 WO2016086459 A1 WO 2016086459A1 CN 2014094052 W CN2014094052 W CN 2014094052W WO 2016086459 A1 WO2016086459 A1 WO 2016086459A1
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voltage
bus
bus voltage
circuit
voltage sensor
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PCT/CN2014/094052
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French (fr)
Chinese (zh)
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张桂成
高永军
管俊青
张瑞峰
顾秀江
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永济新时速电机电器有限责任公司
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Publication of WO2016086459A1 publication Critical patent/WO2016086459A1/en

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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

Definitions

  • the invention relates to the technical field of high-speed electric trains, in particular to a traction converter with a double-voltage sensor bus voltage detecting circuit.
  • High-speed EMU technology has developed rapidly in recent years, and traction converters are an important part of high-speed EMUs.
  • the traction converter outputs three-phase alternating current to drive the traction motor in the high-speed EMU to drive the operation of the EMU.
  • the traction converter is generally composed of a rectifier, an inverter, and the like.
  • the rectifier rectifies the input alternating current
  • the inverter is used to convert the rectified direct current into alternating current to drive the traction motor.
  • the bus voltage is the voltage output from the rectifier and is input to the three-phase inverter.
  • the bus voltage link is a very important part in the traction converter system. First, the bus voltage can indirectly show the operating state of the rectifier and the inverter; secondly, the bus voltage is a very important variable in the control system, and the detection of the bus voltage plays an important role in the protection of the entire traction converter. Therefore, the accuracy and rapidity of the detection of the bus voltage is very important for the entire traction converter.
  • the present invention provides a traction converter with a dual voltage sensor bus voltage detection circuit for overcoming the defects of poor reliability and low precision of the bus voltage detection in the prior art.
  • the invention provides a traction converter with a dual voltage sensor bus voltage detection circuit, comprising:
  • the rectifier circuit includes at least one four-quadrant rectifier in parallel, and two output ends of each of the four-quadrant rectifiers are respectively connected to a positive terminal and a negative terminal of the bus bar;
  • the bus voltage detecting circuit includes a first voltage sensor and a second voltage sensor for detecting a bus voltage between a positive terminal and a negative terminal of the bus bar, wherein the first voltage sensor and the second voltage sensor are connected in parallel a positive end and a negative end of the bus bar;
  • the inverter circuit includes at least one three-phase inverter connected in parallel, and two input ends of each of the three-phase inverters are respectively connected to a positive end and a negative end of the bus bar, and each of the three-phase inverse
  • the three-phase outputs of the transformer are respectively connected to corresponding three-phase inputs of at least one traction motor.
  • the traction converter with dual voltage sensor bus voltage detecting circuit comprises a rectifying circuit, a bus voltage detecting circuit and an inverter circuit which are sequentially connected.
  • the rectifying circuit comprises at least one four-quadrant rectifier connected in parallel for filtering high-order harmonics in the input current, and the voltage outputted by the rectifying circuit is a bus voltage;
  • the bus voltage detecting circuit is configured to detect the positive end of the bus bar And a bus voltage between the negative terminal, comprising a first voltage sensor and a second voltage sensor, wherein the first voltage sensor and the second voltage sensor are connected in parallel at the positive terminal and the negative terminal of the bus bar;
  • the inverter circuit comprises at least one parallel inverter And means for controlling the output of the alternating current according to the detected bus voltage to drive the traction motor to operate.
  • FIG. 1 is a schematic structural diagram of a circuit of a first embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention
  • FIG. 2 is a schematic diagram showing the circuit structure of a second embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention.
  • FIG. 1 is a schematic diagram of a circuit structure of a first embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention.
  • the traction converter includes:
  • the rectifier circuit 1 includes at least one four-quadrant rectifier in parallel, and two outputs of each of the four-quadrant rectifiers are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar.
  • the number of four-quadrant rectifiers is two, and the two four-quadrant rectifiers are denoted as 11 and 12, respectively.
  • the first four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are connected in parallel, and the first output terminal E1 and the second output terminal F1 of the first four-quadrant rectifier 11 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar, respectively.
  • the first input terminal A3 and the second input terminal B3 of the four-quadrant rectifier 11 are configured to receive the input alternating current; the first output terminal E2 and the second output terminal F2 of the second four-quadrant rectifier 12 are respectively connected to the positive terminal VDC+ of the busbar and The negative terminal VDC-, the first input terminal A4 and the second input terminal B4 of the second four-quadrant rectifier 12 are used to receive another input AC power.
  • the alternating current of these two inputs is 50Hz, that is, 50Hz alternating current from the transformer output to the rectifier, the two four-quadrant rectifier outputs are connected in parallel, and the voltage after the parallel connection is the bus voltage.
  • the bus voltage detecting circuit 2 is connected between the positive terminal VDC+ and the negative terminal VDC- of the bus bar for detecting the bus voltage of the output end of the rectifier circuit 1.
  • the bus voltage detecting circuit 2 includes a first voltage sensor 21 and a second voltage sensor 22, and the first voltage sensor 21 and the second voltage sensor 22 are connected in parallel to the positive terminal VDC+ and the negative terminal VDC- of the bus bar.
  • the traction converter further includes a processor 4, and the processor 4 is connected to the first voltage sensor 21 and the second voltage sensor 22, respectively.
  • the first voltage sensor 21 detects the first bus voltage between the positive terminal VDC+ and the negative terminal VDC- of the bus
  • the second voltage sensor 22 detects the second bus between the positive terminal VDC+ and the negative terminal VDC- of the bus.
  • the processor 4 determines that the bus voltage is an average value of the first bus voltage and the second bus voltage when determining that the absolute difference between the first bus voltage and the second bus voltage is not greater than a preset threshold.
  • the result of the bus voltage detected by the two voltage sensors is comprehensively considered, so that the final determination result of the bus voltage is more accurate.
  • the processor 4 may further determine the first voltage sensor when determining that the absolute difference between the first bus voltage and the second bus voltage is greater than the preset threshold. 21 and a voltage sensor that operates normally in the second voltage sensor 22, and determines that the bus voltage is a voltage value detected by the working voltage sensor. Specifically, the voltage displayed by the abnormality that is abnormal, that is, the voltage displayed by the voltage sensor is different from the range in which the bus voltage can take a value, so that the processor 4 can determine which voltage sensor works normally and which one fails, so when When a voltage sensor fails, the bus voltage can be detected by another voltage sensor, which improves the reliability of the bus voltage detection.
  • the inverter circuit 3 includes at least one three-phase inverter connected in parallel, and two input ends of each of the three-phase inverters are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar.
  • the three-phase output terminals of each of the three-phase inverters are respectively connected to corresponding three-phase input ends of at least one traction motor. Taking the number of three-phase inverters included in the inverter circuit as two as an example, the first three-phase inverter 31 and the second three-phase inverter 32 are respectively.
  • the first input end A5 and the second input end B5 of the first three-phase inverter 31 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus, and the three-phase output of the first three-phase inverter Connecting at least one traction motor;
  • the first input terminal A6 and the second input terminal B6 of the second three-phase inverter 32 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar, and the second three-phase inverter
  • the three-phase output of the unit 32 is coupled to at least one traction motor.
  • the traction converter provided in this embodiment includes a rectifier circuit, a bus voltage detection circuit and an inverter circuit which are sequentially connected.
  • the rectifier circuit includes at least one four-quadrant rectifier connected in parallel, and the voltage output by the rectifier circuit is a bus voltage;
  • the bus voltage detection circuit is configured to detect a bus voltage between the positive terminal and the negative terminal of the bus, including the first voltage a sensor and a second voltage sensor, the first voltage sensor and the second voltage sensor being connected in parallel at the positive terminal and the negative terminal of the bus bar;
  • the inverter circuit includes at least one inverter connected in parallel for detecting the bus voltage and other controls Information is used to control the AC power of its output to drive the traction motor to operate.
  • the traction converter further includes a secondary filter circuit 5 connected to the output end of the rectifier circuit 1 for filtering The second harmonic of the bus voltage connected to the rectifier circuit 1 , wherein the secondary filter circuit 5 includes a filter capacitor C1 and a filter inductor L1 connected in series.
  • the capacitance C1 ranges from 3 mF to 7 mF
  • the inductance L1 ranges from 0.4 mH to 0.8 mH.
  • the secondary filter circuit 5 is used to filter out the output of the rectifier circuit 1 to The harmonics in the voltage on the bus, especially the second harmonic, the harmonic of the 100 Hz frequency.
  • the traction converter further includes: a supporting capacitor 6 connected to the output end of the bus voltage detecting circuit 2 and connected to the Between the positive and negative ends of the bus.
  • the traction converter further includes: a first pre-charging circuit 71 and a second pre-charging circuit 72, configured to control a variation amplitude of the input current when the traction converter is initially powered on, so as to change the input current The amplitude is not too large and damages the device.
  • the input terminal A1 of the first pre-charging circuit 71 is connected to the secondary side output winding P1 of the traction transformer, and the output terminal B1 of the first pre-charging circuit 72 is connected to the first input terminal A3 of the first four-quadrant rectifier 11.
  • the second input end B3 of the first four-quadrant rectifier 11 is connected to the secondary side output winding N1 of the traction transformer;
  • the input terminal A2 of the second pre-charging circuit 72 is connected to the secondary side output winding P2 of the traction transformer, and the output terminal B2 of the second pre-charging circuit 72 is connected to the first input terminal A4 of the second four-quadrant rectifier 12.
  • the second input end of the second four-quadrant rectifier 12 is connected to the secondary side output winding N2 of the traction transformer of B4.
  • the first pre-charge circuit 71 includes a first switch K1, a second switch K2 and a resistor R1, and the second pre-charge circuit 72 includes a third switch K3;
  • the first switch K1 and the resistor R1 are connected in series and then connected in parallel with the second switch K2.
  • the first switch K1 in the first pre-charge circuit 71 is closed, the second switch K2 is turned off, and the third switch K3 of the second pre-charge circuit 72 is turned off.
  • the current reaches the first four-quadrant rectifier 11 through the resistor R1, so that the current variation amplitude (di/dt) at the start of power-on is not excessively large, reducing the hazard to each device.
  • the switch K1 is disconnected, and K2 and K3 are closed.
  • the resistance R1 ranges from 10 ⁇ to 50 ⁇ .
  • the rectifier circuit 1 in this embodiment is composed of two parallel four-quadrant rectifiers. As shown in FIG. 2, the first four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are respectively 8
  • the first four-quadrant rectifier 11 is composed of IGBTs characterized by S1-S8, and the second four-quadrant rectifier 12 is composed of IGBTs characterized by S9-S16.
  • the emitter of S1 is coupled to the collector of S3
  • the emitter of S2 is coupled to the collector of S4
  • the emitter of S5 is coupled to the collector of S7
  • the emitter of S6 is coupled to the emitter of S8.
  • the collectors are connected together.
  • the emitters of S1 and S2 are connected together and connected to the first input terminal A3 of the first four-quadrant rectifier 11; the emitters of S5 and S6 are connected together, and the second input terminal B3 of the first four-quadrant rectifier 11 Connecting; the collectors of S1, S2, S5 and S6 are connected together and connected to the first output E1 of the first four-quadrant rectifier 11; the emitters of S3, S4, S7 and S8 are connected together and first The second output terminal F1 of the four-quadrant rectifier 11 is connected.
  • a similar connection relationship is also applicable to the second four-quadrant rectifier 12, and the specific connection relationship is as shown in FIG. 2 and will not be described again.
  • the rectifier circuit is composed of two cascaded four-quadrant rectifiers, and the phase shift angle is controlled by Pulse-Width Modulation (PWM) technology, and the input currents of the two rectifiers are high harmonic.
  • PWM Pulse-Width Modulation
  • the peaks and troughs of the waves are just staggered so that the higher harmonics of the current can cancel each other out.
  • a multiplexing technique is usually employed for the rectifier.
  • a two-folded pulse rectifier that is, two four-quadrant rectifiers, is used, and the triangular carrier phases of the two rectifiers are shifted from each other by a phase angle of ⁇ /2, and then the waveform generation method and carrier phase shift in the PWM technology are utilized.
  • the stepped wave obtained by the phase shift superposition in the technology, so that the peaks and troughs of the input current higher harmonics of the two rectifiers are exactly shifted, so that some harmonics in the harmonic content of the primary current of the transformer cancel each other out.
  • the inverter circuit 3 is composed of two parallel three-phase inverters, as shown in FIG. 2, the first three-phase inverter 31 and the second three.
  • the phase inverters 32 are each composed of six IGBTs, that is, the first three-phase inverter 31 is composed of S17-S22, and the second three-phase inverter 32 is composed of S23-S28.
  • the emitter of S17 is connected to the collector of S20
  • the emitter of S18 is connected to the collector of S21
  • the emitter of S19 is connected to the collector of S22.
  • the collectors of S17, S18 and S19 are connected together and connected to the first input terminal A5 of the first three-phase inverter 31, and the emitters of S20, S21 and S22 are connected together, and the first three The second input terminal B5 of the phase inverter 31 is connected.
  • the emitters of S17, S18 and S19 are respectively the three-phase outputs of the first three-phase inverter 31, Corresponding three-phase inputs of at least one traction motor are respectively connected.
  • the emitter of S23 is connected to the collector of S26
  • the emitter of S24 is connected to the collector of S27
  • the emitter of S25 is connected to the collector of S28.
  • the collectors of S23, S24 and S25 are connected together and connected to the first input A6 of the second three-phase inverter 32
  • the emitters of S26, S27 and S28 are connected together, and the second three phase The second input B6 of the inverter 32 is connected.
  • the emitters of S23, S24 and S25 are respectively the three-phase outputs of the second three-phase inverter 32, and are respectively connected to corresponding three-phase inputs of at least one traction motor.
  • each three-phase inverter drives two traction motors, and two traction motors driven by each three-phase inverter are connected to one bogie of the motor car.
  • each three-phase inverter drives two traction motors
  • two traction motors driven by one three-phase inverter are connected to a bogie of a motor car. on.
  • the bogie driving mode adopts a vehicle-controlled open-loop control mode, that is, an inverter drives four traction motor operating modes, and has better control performance and higher reliability.
  • the main circuit of the traction converter includes a pre-charging circuit, a rectifying circuit, a bus voltage detecting circuit, a secondary filtering circuit, a supporting capacitor and an inverter circuit which are sequentially connected.
  • the pre-charging circuit is used to control the variation range of the input current when the traction converter is initially powered up, so that the variation of the current of the input rectifying circuit is not excessively large, which is beneficial to reducing damage to the components of the converter;
  • the circuit includes two four-quadrant rectifiers connected in parallel.
  • the bus voltage detection circuit is composed of two voltage sensors connected in parallel, which is used to detect the bus voltage of the two four-quadrant rectifiers in parallel, so that the detection of the bus voltage is more reliable and accurate;
  • the secondary filter circuit and the support The capacitor is used to filter out the second harmonic and ripple in the bus voltage, so that the voltage input to the inverter circuit is more accurate and stable;
  • the inverter circuit includes two parallel inverters for converting the DC power input thereto into AC power is used to drive the traction motor.
  • the voltage input to the inverter is accurate and reliable, which is beneficial to ensure the traction motor. Safe and reliable drive.

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Abstract

A traction converter of a bus voltage detection circuit having double voltage sensors, the traction converter comprising a rectifying circuit (1), a bus voltage detection circuit (2) and an inverter circuit (3) connected in sequence; the rectifying circuit (1) comprises one or more four-quadrant rectifiers (11, 12) connected in parallel; the bus voltage detection circuit (2) is used to detect a bus voltage between a positive end (VDC+) and a negative end (VDC-) of a bus, and comprises a first voltage sensor (21) and a second voltage sensor (22) connected in parallel to the positive end (VDC+) and the negative end (VDC-) of the bus; the inverter circuit (3) comprises one or more inverters (31, 32) connected in parallel, and is used to drive and pull a motor to operate. Two parallel voltage sensors (21, 22) are disposed to detect a bus voltage, such that one of the voltage sensors (21, 22) serving in a redundancy configuration can detect the bus voltage when the other voltage sensor (21, 22) malfunctions, thus improving reliability; in addition, the two voltage sensors (21, 22) are combined to detect the bus voltage, thus having a better detection precision.

Description

带双电压传感器母线电压检测电路的牵引变流器Traction converter with dual voltage sensor bus voltage detection circuit 技术领域Technical field
本发明涉及高速动车组技术领域，尤其涉及一种带双电压传感器母线电压检测电路的牵引变流器。The invention relates to the technical field of high-speed electric trains, in particular to a traction converter with a double-voltage sensor bus voltage detecting circuit.
背景技术Background technique
高速动车组技术近年来得到了飞速的发展，牵引变流器是高速动车组的重要组成部分。牵引变流器输出三相交流电以驱动高速动车组内的牵引电机运行，从而驱动动车组的运行。High-speed EMU technology has developed rapidly in recent years, and traction converters are an important part of high-speed EMUs. The traction converter outputs three-phase alternating current to drive the traction motor in the high-speed EMU to drive the operation of the EMU.
牵引变流器一般由整流器、逆变器等组成。其中，整流器对输入的交流电进行整流处理，逆变器用于将整流处理后的直流电变为交流电，以驱动牵引电机。母线电压是整流器输出的电压，并且输入到三相逆变器中。母线电压环节在牵引变流器***中是一个非常重要的环节。首先，母线电压可以间接的显示出整流器和逆变器的工作状态；其次母线电压在控制***中是一个非常重要的变量,并且母线电压的检测对于整个牵引变流器的保护有着十分重要的作用,因此母线电压的检测的准确性和快速性对于整个牵引变流器有着十分重要的作用。The traction converter is generally composed of a rectifier, an inverter, and the like. The rectifier rectifies the input alternating current, and the inverter is used to convert the rectified direct current into alternating current to drive the traction motor. The bus voltage is the voltage output from the rectifier and is input to the three-phase inverter. The bus voltage link is a very important part in the traction converter system. First, the bus voltage can indirectly show the operating state of the rectifier and the inverter; secondly, the bus voltage is a very important variable in the control system, and the detection of the bus voltage plays an important role in the protection of the entire traction converter. Therefore, the accuracy and rapidity of the detection of the bus voltage is very important for the entire traction converter.
但是，目前一般采用在母线间设置一个电压传感器来检测母线电压。这种检测方法可靠性较差，当该电压传感器发生故障时，***就不能获得母线电压的值，并且其测量的精度也较差。However, it is generally common to provide a voltage sensor between the bus bars to detect the bus voltage. This detection method is less reliable. When the voltage sensor fails, the system cannot obtain the value of the bus voltage, and the measurement accuracy is also poor.
发明内容Summary of the invention
针对上述存在的问题，本发明提供一种带双电压传感器母线电压检测电路的牵引变流器，用以克服现有技术中母线电压检测可靠性差，精度低的缺陷。In view of the above problems, the present invention provides a traction converter with a dual voltage sensor bus voltage detection circuit for overcoming the defects of poor reliability and low precision of the bus voltage detection in the prior art.
本发明提供了一种带双电压传感器母线电压检测电路的牵引变流器，包括：The invention provides a traction converter with a dual voltage sensor bus voltage detection circuit, comprising:
依次连接的整流电路、母线电压检测电路和逆变电路； a rectifier circuit, a bus voltage detection circuit and an inverter circuit connected in sequence;
所述整流电路包括并联的至少一个四象限整流器，每个所述四象限整流器的两个输出端分别连接在母线的正端和负端；The rectifier circuit includes at least one four-quadrant rectifier in parallel, and two output ends of each of the four-quadrant rectifiers are respectively connected to a positive terminal and a negative terminal of the bus bar;
所述母线电压检测电路包括第一电压传感器和第二电压传感器，用于检测所述母线的正端和负端间的母线电压，所述第一电压传感器和所述第二电压传感器并联连接在所述母线的正端和负端；The bus voltage detecting circuit includes a first voltage sensor and a second voltage sensor for detecting a bus voltage between a positive terminal and a negative terminal of the bus bar, wherein the first voltage sensor and the second voltage sensor are connected in parallel a positive end and a negative end of the bus bar;
所述逆变电路包括并联的至少一个三相逆变器，每个所述三相逆变器的两个输入端分别连接在所述母线的正端和负端，每个所述三相逆变器的三相输出端分别连接在至少一个牵引电机的对应三相输入端。The inverter circuit includes at least one three-phase inverter connected in parallel, and two input ends of each of the three-phase inverters are respectively connected to a positive end and a negative end of the bus bar, and each of the three-phase inverse The three-phase outputs of the transformer are respectively connected to corresponding three-phase inputs of at least one traction motor.
本发明提供的带双电压传感器母线电压检测电路的牵引变流器，包括依次连接的整流电路、母线电压检测电路和逆变电路。其中，整流电路包括并联连接的至少一个四象限整流器，用于滤除输入电流中高次谐波，并且，整流电路输出的电压即为母线电压；母线电压检测电路用于检测所述母线的正端和负端间的母线电压，其包括第一电压传感器和第二电压传感器，第一电压传感器和第二电压传感器并联连接在母线的正端和负端；逆变电路包括至少一个并联的逆变器，用于根据检测到的母线电压控制其输出的交流电以驱动牵引电机运行。通过设置两个并联的电压传感器来检测母线电压，一方面使得某个电压传感器故障时，另一个作为冗余配置还能实现母线电压的检测，具有更好的可靠性；另一方面，两个电压传感器联合检测母线电压，具有更好的检测精度。The traction converter with dual voltage sensor bus voltage detecting circuit provided by the invention comprises a rectifying circuit, a bus voltage detecting circuit and an inverter circuit which are sequentially connected. Wherein, the rectifying circuit comprises at least one four-quadrant rectifier connected in parallel for filtering high-order harmonics in the input current, and the voltage outputted by the rectifying circuit is a bus voltage; the bus voltage detecting circuit is configured to detect the positive end of the bus bar And a bus voltage between the negative terminal, comprising a first voltage sensor and a second voltage sensor, wherein the first voltage sensor and the second voltage sensor are connected in parallel at the positive terminal and the negative terminal of the bus bar; the inverter circuit comprises at least one parallel inverter And means for controlling the output of the alternating current according to the detected bus voltage to drive the traction motor to operate. By setting two parallel voltage sensors to detect the bus voltage, on the one hand, when one voltage sensor fails, the other as a redundant configuration can also detect the bus voltage and have better reliability; on the other hand, two The voltage sensor jointly detects the bus voltage and has better detection accuracy.
附图说明DRAWINGS
图1为本发明带双电压传感器母线电压检测电路的牵引变流器实施例一的电路结构示意图；1 is a schematic structural diagram of a circuit of a first embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention;
图2为本发明带双电压传感器母线电压检测电路的牵引变流器实施例二的电路结构示意图。2 is a schematic diagram showing the circuit structure of a second embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中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。基于 本发明中的实施例，本领域普通技术人员在没有作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。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. based on All other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present invention.
图1为本发明带双电压传感器母线电压检测电路的牵引变流器实施例一的电路结构示意图，如图1所示，该牵引变流器包括：1 is a schematic diagram of a circuit structure of a first embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention. As shown in FIG. 1, the traction converter includes:
依次连接的整流电路1、母线电压检测电路2和逆变电路3；a rectifier circuit 1, a bus voltage detection circuit 2 and an inverter circuit 3 connected in sequence;
具体地，其中，所述整流电路1包括并联的至少一个四象限整流器，每个所述四象限整流器的两个输出端分别连接在母线的正端VDC+和负端VDC-。Specifically, wherein the rectifier circuit 1 includes at least one four-quadrant rectifier in parallel, and two outputs of each of the four-quadrant rectifiers are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar.
本实施例中，优选地，以四象限整流器的数量为2个为例，两个四象限整流器分别表示为11和12。第一四象限整流器11和第二四象限整流器12并联，且第一四象限整流器11的第一输出端E1和第二输出端F1分别连接在母线的正端VDC+和负端VDC-，第一四象限整流器11的第一输入端A3和第二输入端B3用于接收输入的交流电；第二四象限整流器12的第一输出端E2和第二输出端F2分别连接在母线的正端VDC+和负端VDC-，第二四象限整流器12的第一输入端A4和第二输入端B4用于接收另一输入的交流电。其中，这两个输入的交流电都为50Hz，即从变压器输出到整流器上的为50Hz的交流电，两个四象限整流器输出并联，其并联后的电压为母线电压。In this embodiment, preferably, the number of four-quadrant rectifiers is two, and the two four-quadrant rectifiers are denoted as 11 and 12, respectively. The first four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are connected in parallel, and the first output terminal E1 and the second output terminal F1 of the first four-quadrant rectifier 11 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar, respectively. The first input terminal A3 and the second input terminal B3 of the four-quadrant rectifier 11 are configured to receive the input alternating current; the first output terminal E2 and the second output terminal F2 of the second four-quadrant rectifier 12 are respectively connected to the positive terminal VDC+ of the busbar and The negative terminal VDC-, the first input terminal A4 and the second input terminal B4 of the second four-quadrant rectifier 12 are used to receive another input AC power. Among them, the alternating current of these two inputs is 50Hz, that is, 50Hz alternating current from the transformer output to the rectifier, the two four-quadrant rectifier outputs are connected in parallel, and the voltage after the parallel connection is the bus voltage.
具体地，所述母线电压检测电路2连接在所述母线的正端VDC+和负端VDC-间，用于检测所述整流电路1输出端的母线电压。所述母线电压检测电路2包括第一电压传感器21和第二电压传感器22，第一电压传感器21和第二电压传感器22并联连接在所述母线的正端VDC+和负端VDC-。Specifically, the bus voltage detecting circuit 2 is connected between the positive terminal VDC+ and the negative terminal VDC- of the bus bar for detecting the bus voltage of the output end of the rectifier circuit 1. The bus voltage detecting circuit 2 includes a first voltage sensor 21 and a second voltage sensor 22, and the first voltage sensor 21 and the second voltage sensor 22 are connected in parallel to the positive terminal VDC+ and the negative terminal VDC- of the bus bar.
进一步地，所述牵引变流器还包括：处理器4，所述处理器4分别与所述第一电压传感器21和所述第二电压传感器22连接。具体来说，第一电压传感器21检测获得母线的正端VDC+和负端VDC-间的第一母线电压，第二电压传感器22检测获得母线的正端VDC+和负端VDC-间的第二母线电压。处理器4在判断第一母线电压和第二母线电压的绝对差值不大于预设阈值时，确定母线电压为第一母线电压和第二母线电压的平均值。从而，综合考虑了两个电压传感器检测的母线电压的结果，使得母线电压的最终确定结果更加准确。 Further, the traction converter further includes a processor 4, and the processor 4 is connected to the first voltage sensor 21 and the second voltage sensor 22, respectively. Specifically, the first voltage sensor 21 detects the first bus voltage between the positive terminal VDC+ and the negative terminal VDC- of the bus, and the second voltage sensor 22 detects the second bus between the positive terminal VDC+ and the negative terminal VDC- of the bus. Voltage. The processor 4 determines that the bus voltage is an average value of the first bus voltage and the second bus voltage when determining that the absolute difference between the first bus voltage and the second bus voltage is not greater than a preset threshold. Thus, the result of the bus voltage detected by the two voltage sensors is comprehensively considered, so that the final determination result of the bus voltage is more accurate.
另外，如果两个电压传感器中有一个发生了故障时，处理器4还可以在判断第一母线电压和第二母线电压的绝对差值大于所述预设阈值时，确定所述第一电压传感器21和所述第二电压传感器22中工作正常的电压传感器，并确定母线电压为该工作正常的电压传感器所检测到的电压值。具体地，工作异常即发生故障的电压传感器所显示的电压与母线电压可以取值的范围相差很大，从而，处理器4可以据此确定哪个电压传感器正常工作，哪个发生了故障，因此，当一个电压传感器发生故障时，可以通过另一个电压传感器来实现母线电压的检测，提高了母线电压检测的可靠性。In addition, if one of the two voltage sensors fails, the processor 4 may further determine the first voltage sensor when determining that the absolute difference between the first bus voltage and the second bus voltage is greater than the preset threshold. 21 and a voltage sensor that operates normally in the second voltage sensor 22, and determines that the bus voltage is a voltage value detected by the working voltage sensor. Specifically, the voltage displayed by the abnormality that is abnormal, that is, the voltage displayed by the voltage sensor is different from the range in which the bus voltage can take a value, so that the processor 4 can determine which voltage sensor works normally and which one fails, so when When a voltage sensor fails, the bus voltage can be detected by another voltage sensor, which improves the reliability of the bus voltage detection.
再具体地，所述逆变电路3包括并联的至少一个三相逆变器，每个所述三相逆变器的两个输入端分别连接在所述母线的正端VDC+和负端VDC-，每个所述三相逆变器的三相输出端分别连接在至少一个牵引电机的对应三相输入端。以逆变电路包括的三相逆变器的数量为2个为例，分别为第一三相逆变器31和第二三相逆变器32。所述第一三相逆变器31的第一输入端A5和第二输入端B5分别连接在母线的正端VDC+和负端VDC-，所述第一三相逆变器的三相输出端连接至少一个牵引电机；所述第二三相逆变器32的第一输入端A6和第二输入端B6分别连接在母线的正端VDC+和负端VDC-，所述第二三相逆变器32的三相输出端连接至少一个牵引电机。More specifically, the inverter circuit 3 includes at least one three-phase inverter connected in parallel, and two input ends of each of the three-phase inverters are respectively connected to a positive terminal VDC+ and a negative terminal VDC- of the bus bar. The three-phase output terminals of each of the three-phase inverters are respectively connected to corresponding three-phase input ends of at least one traction motor. Taking the number of three-phase inverters included in the inverter circuit as two as an example, the first three-phase inverter 31 and the second three-phase inverter 32 are respectively. The first input end A5 and the second input end B5 of the first three-phase inverter 31 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus, and the three-phase output of the first three-phase inverter Connecting at least one traction motor; the first input terminal A6 and the second input terminal B6 of the second three-phase inverter 32 are respectively connected to the positive terminal VDC+ and the negative terminal VDC- of the bus bar, and the second three-phase inverter The three-phase output of the unit 32 is coupled to at least one traction motor.
本实施例提供的牵引变流器，包括依次连接的整流电路、母线电压检测电路和逆变电路。其中，整流电路包括并联连接的至少一个四象限整流器，整流电路输出的电压即为母线电压；母线电压检测电路用于检测所述母线的正端和负端间的母线电压，其包括第一电压传感器和第二电压传感器，第一电压传感器和第二电压传感器并联连接在母线的正端和负端；逆变电路包括至少一个并联的逆变器，用于根据检测到的母线电压以及其他控制信息来控制其输出的交流电以驱动牵引电机运行。通过设置两个并联的电压传感器来检测母线电压，一方面使得某个电压传感器故障时，另一个作为冗余配置还能实现母线电压的检测，具有更好的可靠性；另一方面，两个电压传感器联合检测母线电压，具有更好的检测精度。The traction converter provided in this embodiment includes a rectifier circuit, a bus voltage detection circuit and an inverter circuit which are sequentially connected. The rectifier circuit includes at least one four-quadrant rectifier connected in parallel, and the voltage output by the rectifier circuit is a bus voltage; the bus voltage detection circuit is configured to detect a bus voltage between the positive terminal and the negative terminal of the bus, including the first voltage a sensor and a second voltage sensor, the first voltage sensor and the second voltage sensor being connected in parallel at the positive terminal and the negative terminal of the bus bar; the inverter circuit includes at least one inverter connected in parallel for detecting the bus voltage and other controls Information is used to control the AC power of its output to drive the traction motor to operate. By setting two parallel voltage sensors to detect the bus voltage, on the one hand, when one voltage sensor fails, the other as a redundant configuration can also detect the bus voltage and have better reliability; on the other hand, two The voltage sensor jointly detects the bus voltage and has better detection accuracy.
图2为本发明带双电压传感器母线电压检测电路的牵引变流器实施例二的电路结构示意图，如图2所示，在图1所示实施例的基础上，该牵引变流器还包括与所述整流电路1输出端连接的二次滤波电路5，用于滤除 所述整流电路1连接的母线电压中的二次谐波，其中，该二次滤波电路5包括串联的滤波电容C1和滤波电感L1。所述电容C1的取值范围为3mF-7mF，所述电感L1的取值范围为0.4mH-0.8mH。由于母线电压中还会存在二次谐波分量，这样会影响后方元器件的寿命以及牵引***的正确运行，因此，本实施例中采用了该二次滤波电路5来滤除了整流电路1输出到母线上的电压中的谐波，尤其是二次谐波，即100Hz频率的谐波。2 is a schematic diagram of a circuit structure of a second embodiment of a traction converter with a dual voltage sensor bus voltage detecting circuit according to the present invention. As shown in FIG. 2, on the basis of the embodiment shown in FIG. 1, the traction converter further includes a secondary filter circuit 5 connected to the output end of the rectifier circuit 1 for filtering The second harmonic of the bus voltage connected to the rectifier circuit 1 , wherein the secondary filter circuit 5 includes a filter capacitor C1 and a filter inductor L1 connected in series. The capacitance C1 ranges from 3 mF to 7 mF, and the inductance L1 ranges from 0.4 mH to 0.8 mH. Since the second harmonic component is also present in the bus voltage, this will affect the life of the rear components and the correct operation of the traction system. Therefore, in the present embodiment, the secondary filter circuit 5 is used to filter out the output of the rectifier circuit 1 to The harmonics in the voltage on the bus, especially the second harmonic, the harmonic of the 100 Hz frequency.
另外，为了进一步降低母线电压中的纹波，本实施例中，该牵引变流器还包括：支撑电容6，所述支撑电容6连接在母线电压检测电路2的输出端，并连接在所述母线的正端和负端间。In addition, in order to further reduce the ripple in the bus voltage, in the embodiment, the traction converter further includes: a supporting capacitor 6 connected to the output end of the bus voltage detecting circuit 2 and connected to the Between the positive and negative ends of the bus.
进一步地，该牵引变流器还包括：第一预充电电路71和第二预充电电路72，用于在所述牵引变流器初始上电时控制输入电流的变化幅度，使输入电流的变化幅度不至于过大，损坏器件。Further, the traction converter further includes: a first pre-charging circuit 71 and a second pre-charging circuit 72, configured to control a variation amplitude of the input current when the traction converter is initially powered on, so as to change the input current The amplitude is not too large and damages the device.
所述第一预充电电路71的输入端A1与牵引变压器的二次侧输出绕组P1连接，所述第一预充电电路72的输出端B1与第一四象限整流器11的第一输入端A3连接，所述第一四象限整流器11的第二输入端B3与所述牵引变压器的二次侧输出绕组N1连接；The input terminal A1 of the first pre-charging circuit 71 is connected to the secondary side output winding P1 of the traction transformer, and the output terminal B1 of the first pre-charging circuit 72 is connected to the first input terminal A3 of the first four-quadrant rectifier 11. The second input end B3 of the first four-quadrant rectifier 11 is connected to the secondary side output winding N1 of the traction transformer;
所述第二预充电电路72的输入端A2与牵引变压器的二次侧输出绕组P2连接，所述第二预充电电路72的输出端B2与第二四象限整流器12的第一输入端A4连接，所述第二四象限整流器12的第二输入端与B4所述牵引变压器的二次侧输出绕组N2连接。The input terminal A2 of the second pre-charging circuit 72 is connected to the secondary side output winding P2 of the traction transformer, and the output terminal B2 of the second pre-charging circuit 72 is connected to the first input terminal A4 of the second four-quadrant rectifier 12. The second input end of the second four-quadrant rectifier 12 is connected to the secondary side output winding N2 of the traction transformer of B4.
具体地，所述第一预充电电路71包括第一开关K1、第二开关K2和电阻R1，所述第二预充电电路72包括第三开关K3；Specifically, the first pre-charge circuit 71 includes a first switch K1, a second switch K2 and a resistor R1, and the second pre-charge circuit 72 includes a third switch K3;
所述第一开关K1和所述电阻R1串联后与所述第二开关K2并联。The first switch K1 and the resistor R1 are connected in series and then connected in parallel with the second switch K2.
实际使用时，当牵引变流器上电时，第一预充电电路71中的第一开关K1闭合，第二开关K2断开，第二预充电电路72的第三开关K3断开。电流经过电阻R1到达第一四象限整流器11，使得开始上电时的电流变化幅度(di/dt)不至于过大，减小对各器件的危害。3-10ms后开关K1断开，K2、K3闭合。电阻R1的取值范围为10Ω-50Ω。In actual use, when the traction converter is powered up, the first switch K1 in the first pre-charge circuit 71 is closed, the second switch K2 is turned off, and the third switch K3 of the second pre-charge circuit 72 is turned off. The current reaches the first four-quadrant rectifier 11 through the resistor R1, so that the current variation amplitude (di/dt) at the start of power-on is not excessively large, reducing the hazard to each device. After 3-10ms, the switch K1 is disconnected, and K2 and K3 are closed. The resistance R1 ranges from 10 Ω to 50 Ω.
具体地，本实施例中的整流电路1是由两个并联的四象限整流器组成，如图2所示，第一四象限整流器11和第二四象限整流器12都是分别由8 个绝缘栅双极型晶体管(IGBT)组成的，即第一四象限整流器11由S1-S8所表征的IGBT组成，第二四象限整流器12由S9-S16所表征的IGBT组成。具体来说，S1的发射极与S3的集电极连接在一起，S2的发射极与S4的集电极连接在一起，S5的发射极与S7的集电极连接在一起，S6的发射极与S8的集电极连接在一起。其中，S1和S2的发射极连接在一起，并与第一四象限整流器11第一输入端A3连接；S5和S6的发射极连接在一起，并与第一四象限整流器11第二输入端B3连接；S1、S2、S5和S6的集电极连接在一起，并与第一四象限整流器11的第一输出端E1连接；S3、S4、S7和S8的发射极连接在一起，并与第一四象限整流器11的第二输出端F1连接。同理，类似的连接关系也适用于第二四象限整流器12，具体的连接关系如图2中所示，不再赘述。Specifically, the rectifier circuit 1 in this embodiment is composed of two parallel four-quadrant rectifiers. As shown in FIG. 2, the first four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are respectively 8 The first four-quadrant rectifier 11 is composed of IGBTs characterized by S1-S8, and the second four-quadrant rectifier 12 is composed of IGBTs characterized by S9-S16. Specifically, the emitter of S1 is coupled to the collector of S3, the emitter of S2 is coupled to the collector of S4, the emitter of S5 is coupled to the collector of S7, and the emitter of S6 is coupled to the emitter of S8. The collectors are connected together. Wherein the emitters of S1 and S2 are connected together and connected to the first input terminal A3 of the first four-quadrant rectifier 11; the emitters of S5 and S6 are connected together, and the second input terminal B3 of the first four-quadrant rectifier 11 Connecting; the collectors of S1, S2, S5 and S6 are connected together and connected to the first output E1 of the first four-quadrant rectifier 11; the emitters of S3, S4, S7 and S8 are connected together and first The second output terminal F1 of the four-quadrant rectifier 11 is connected. Similarly, a similar connection relationship is also applicable to the second four-quadrant rectifier 12, and the specific connection relationship is as shown in FIG. 2 and will not be described again.
本实施例中，整流电路由两台级联的四象限整流器构成，通过采用脉宽调制(Pulse-Width Modulation，以下简称PWM)技术对移相角的控制，两台整流器的输入电流高次谐波的波峰和波谷正好错开，使电流的高次谐波能够相互抵消一部分。具体来说，在电力牵引交流传动***中，由于大功率的开关器件的开关频率比较低，为了提高***容量和减小网侧输入电流的谐波含量，通常对整流器采用多重化技术。本实施例具体采用两重化的脉冲整流器，即两个四象限整流器，将两台整流器的三角载波相位相互错开一个π/2的相位角，然后利用PWM技术中的波形生成方式和载波移相技术中的移相叠加得到的阶梯波，从而两台整流器的输入电流高次谐波的波峰和波谷正好错开，使变压器一次侧电流的谐波含量中部分谐波相互抵消。In this embodiment, the rectifier circuit is composed of two cascaded four-quadrant rectifiers, and the phase shift angle is controlled by Pulse-Width Modulation (PWM) technology, and the input currents of the two rectifiers are high harmonic. The peaks and troughs of the waves are just staggered so that the higher harmonics of the current can cancel each other out. Specifically, in the electric traction AC drive system, since the switching frequency of the high-power switching device is relatively low, in order to increase the system capacity and reduce the harmonic content of the input current on the grid side, a multiplexing technique is usually employed for the rectifier. In this embodiment, a two-folded pulse rectifier, that is, two four-quadrant rectifiers, is used, and the triangular carrier phases of the two rectifiers are shifted from each other by a phase angle of π/2, and then the waveform generation method and carrier phase shift in the PWM technology are utilized. The stepped wave obtained by the phase shift superposition in the technology, so that the peaks and troughs of the input current higher harmonics of the two rectifiers are exactly shifted, so that some harmonics in the harmonic content of the primary current of the transformer cancel each other out.
再具体来说，在本实施例的牵引变流器中，逆变电路3由两个并联的三相逆变器组成，如图2所示，第一三相逆变器31和第二三相逆变器32分别由6个IGBT组成，即第一三相逆变器31由S17-S22组成，第二三相逆变器32由S23-S28组成。其中，对于第一三相逆变器31来说，S17的发射极与S20的集电极连接在一起，S18的发射极与S21的集电极连接在一起，S19的发射极与S22的集电极连接在一起，S17、S18和S19的集电极连接在一起，并与第一三相逆变器31的第一输入端A5连接，S20、S21和S22的发射极连接在一起，并与第一三相逆变器31的第二输入端B5连接。S17、S18和S19的发射极分别为第一三相逆变器31的三相输出端， 分别连接至少一个牵引电机的对应三相输入端。More specifically, in the traction converter of the present embodiment, the inverter circuit 3 is composed of two parallel three-phase inverters, as shown in FIG. 2, the first three-phase inverter 31 and the second three. The phase inverters 32 are each composed of six IGBTs, that is, the first three-phase inverter 31 is composed of S17-S22, and the second three-phase inverter 32 is composed of S23-S28. Wherein, for the first three-phase inverter 31, the emitter of S17 is connected to the collector of S20, the emitter of S18 is connected to the collector of S21, and the emitter of S19 is connected to the collector of S22. Together, the collectors of S17, S18 and S19 are connected together and connected to the first input terminal A5 of the first three-phase inverter 31, and the emitters of S20, S21 and S22 are connected together, and the first three The second input terminal B5 of the phase inverter 31 is connected. The emitters of S17, S18 and S19 are respectively the three-phase outputs of the first three-phase inverter 31, Corresponding three-phase inputs of at least one traction motor are respectively connected.
相应的，对于第二三相逆变器32，S23的发射极与S26的集电极连接在一起，S24的发射极与S27的集电极连接在一起，S25的发射极与S28的集电极连接在一起，S23、S24和S25的集电极连接在一起，并与第二三相逆变器32的第一输入端A6连接，S26、S27和S28的发射极连接在一起，并与第二三相逆变器32的第二输入端B6连接。S23、S24和S25的发射极分别为第二三相逆变器32的三相输出端，分别连接至少一个牵引电机的对应三相输入端。Correspondingly, for the second three-phase inverter 32, the emitter of S23 is connected to the collector of S26, the emitter of S24 is connected to the collector of S27, and the emitter of S25 is connected to the collector of S28. Together, the collectors of S23, S24 and S25 are connected together and connected to the first input A6 of the second three-phase inverter 32, the emitters of S26, S27 and S28 are connected together, and the second three phase The second input B6 of the inverter 32 is connected. The emitters of S23, S24 and S25 are respectively the three-phase outputs of the second three-phase inverter 32, and are respectively connected to corresponding three-phase inputs of at least one traction motor.
值得说明的是，优选地，每个三相逆变器驱动2个牵引电机，每个三相逆变器驱动的2个牵引电机连接在动车的一个转向架上。It is worth noting that, preferably, each three-phase inverter drives two traction motors, and two traction motors driven by each three-phase inverter are connected to one bogie of the motor car.
本实施例中，两个三相逆变器并联在母线电压上，每个三相逆变器驱动两个牵引电机，一个三相逆变器驱动的两个牵引电机连接在一个动车的转向架上。这种转向架驱动的方式相比于现有技术方案中多采用车控的开环控制模式，即一台逆变器驱动4台牵引电机运行的模式，控制性能更好，可靠性更高。In this embodiment, two three-phase inverters are connected in parallel on the bus voltage, each three-phase inverter drives two traction motors, and two traction motors driven by one three-phase inverter are connected to a bogie of a motor car. on. Compared with the prior art solution, the bogie driving mode adopts a vehicle-controlled open-loop control mode, that is, an inverter drives four traction motor operating modes, and has better control performance and higher reliability.
本实施例中，该牵引变流器主电路包括依次连接的预充电电路、整流电路、母线电压检测电路、二次滤波电路、支撑电容和逆变电路。其中，预充电电路用于在牵引变流器初始上电时控制输入电流的变化幅度，使得输入整流电路的电流的变化幅度不至于过大，有利于降低对变流器各器件的损坏；整流电路包括并联连接的两个四象限整流器，通过采用脉宽调制技术对移相角的控制，两台整流器的输入电流高次谐波的波峰和波谷正好错开，使变压器一次侧电流的谐波含量中部分谐波相互抵消；母线电压检测电路由并联的两个电压传感器组成，用于检测两个四象限整流器并联输出的母线电压，使得母线电压的检测更加可靠、准确；二次滤波电路和支撑电容，用于滤除母线电压中的二次谐波和纹波，使得输入逆变电路的电压更加准确稳定；逆变电路包括两个并联的逆变器，用于将输入其的直流电转换为交流电以驱动牵引电机运行。通过控制输入电流的变化幅度、滤除输入电流中的高次谐波、滤除母线电压中的二次谐波、纹波，使得输入逆变器的电压准确可靠，有利于保证对牵引电机的安全可靠驱动。In this embodiment, the main circuit of the traction converter includes a pre-charging circuit, a rectifying circuit, a bus voltage detecting circuit, a secondary filtering circuit, a supporting capacitor and an inverter circuit which are sequentially connected. Wherein, the pre-charging circuit is used to control the variation range of the input current when the traction converter is initially powered up, so that the variation of the current of the input rectifying circuit is not excessively large, which is beneficial to reducing damage to the components of the converter; The circuit includes two four-quadrant rectifiers connected in parallel. By adopting pulse width modulation technology to control the phase shift angle, the peaks and troughs of the input current higher harmonics of the two rectifiers are exactly staggered, so that the harmonic content of the primary side current of the transformer is made. The middle part of the harmonics cancel each other out; the bus voltage detection circuit is composed of two voltage sensors connected in parallel, which is used to detect the bus voltage of the two four-quadrant rectifiers in parallel, so that the detection of the bus voltage is more reliable and accurate; the secondary filter circuit and the support The capacitor is used to filter out the second harmonic and ripple in the bus voltage, so that the voltage input to the inverter circuit is more accurate and stable; the inverter circuit includes two parallel inverters for converting the DC power input thereto into AC power is used to drive the traction motor. By controlling the amplitude of the input current, filtering out the higher harmonics in the input current, filtering out the second harmonic in the bus voltage, and ripple, the voltage input to the inverter is accurate and reliable, which is beneficial to ensure the traction motor. Safe and reliable drive.
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对 其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。 Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, and not The invention is described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified or some or all of the technical features may be modified. The equivalents are made without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

  1. 一种带双电压传感器母线电压检测电路的牵引变流器，其特征在于，包括：A traction converter with a dual voltage sensor bus voltage detection circuit, comprising:
    依次连接的整流电路、母线电压检测电路和逆变电路；a rectifier circuit, a bus voltage detection circuit and an inverter circuit connected in sequence;
    所述整流电路包括并联的至少一个四象限整流器，每个所述四象限整流器的两个输出端分别连接在母线的正端和负端；The rectifier circuit includes at least one four-quadrant rectifier in parallel, and two output ends of each of the four-quadrant rectifiers are respectively connected to a positive terminal and a negative terminal of the bus bar;
    所述母线电压检测电路包括第一电压传感器和第二电压传感器，用于检测所述母线的正端和负端间的母线电压，所述第一电压传感器和所述第二电压传感器并联连接在所述母线的正端和负端；The bus voltage detecting circuit includes a first voltage sensor and a second voltage sensor for detecting a bus voltage between a positive terminal and a negative terminal of the bus bar, wherein the first voltage sensor and the second voltage sensor are connected in parallel a positive end and a negative end of the bus bar;
    所述逆变电路包括并联的至少一个三相逆变器，每个所述三相逆变器的两个输入端分别连接在所述母线的正端和负端，每个所述三相逆变器的三相输出端分别连接在至少一个牵引电机的对应三相输入端。The inverter circuit includes at least one three-phase inverter connected in parallel, and two input ends of each of the three-phase inverters are respectively connected to a positive end and a negative end of the bus bar, and each of the three-phase inverse The three-phase outputs of the transformer are respectively connected to corresponding three-phase inputs of at least one traction motor.
  2. 根据权利要求1所述的牵引变流器，其特征在于，所述第一电压传感器具体用于检测所述母线的正端和负端间的第一母线电压，所述第二电压传感器，具体用于检测所述母线的正端和负端间的第二母线电压；The traction converter according to claim 1, wherein the first voltage sensor is specifically configured to detect a first bus voltage between a positive terminal and a negative terminal of the bus bar, the second voltage sensor, specifically a second bus voltage for detecting a positive terminal and a negative terminal of the bus bar;
    所述牵引变流器还包括：处理器，所述处理器分别与所述第一电压传感器和所述第二电压传感器连接，所述处理器用于在判断所述第一母线电压和所述第二母线电压的绝对差值不大于预设阈值时，确定所述母线电压为所述第一母线电压和所述第二母线电压的平均值。The traction converter further includes a processor, the processor being respectively connected to the first voltage sensor and the second voltage sensor, wherein the processor is configured to determine the first bus voltage and the first When the absolute difference between the two bus voltages is not greater than a preset threshold, it is determined that the bus voltage is an average of the first bus voltage and the second bus voltage.
  3. 根据权利要求2所述的牵引变流器，其特征在于，所述处理器还用于：在判断所述第一母线电压和所述第二母线电压的绝对差值大于所述预设阈值时，确定所述第一电压传感器和所述第二电压传感器中工作正常的电压传感器，并确定所述母线电压为所述工作正常的电压传感器所检测到的电压值。The traction converter according to claim 2, wherein the processor is further configured to: when determining that an absolute difference between the first bus voltage and the second bus voltage is greater than the preset threshold Determining a voltage sensor that is working properly in the first voltage sensor and the second voltage sensor, and determining that the bus voltage is a voltage value detected by the working voltage sensor.
  4. 根据权利要求1至3中任一项所述的牵引变流器，其特征在于，还包括与所述整流电路输出端连接的二次滤波电路，用于滤除所述母线电压中的二次谐波；The traction converter according to any one of claims 1 to 3, further comprising a secondary filter circuit connected to the output end of the rectifier circuit for filtering out the second of the bus voltages harmonic;
    所述二次滤波电路包括滤波电容和滤波电感。The secondary filter circuit includes a filter capacitor and a filter inductor.
  5. 根据权利要求1至3中任一项所述的牵引变流器，其特征在于，还包括：支撑电容，所述支撑电容与所述母线电压检测电路输出端连接， 用于去除所述母线电压中的纹波。The traction converter according to any one of claims 1 to 3, further comprising: a supporting capacitor, wherein the supporting capacitor is connected to the output of the bus voltage detecting circuit, Used to remove ripple in the bus voltage.
  6. 根据权利要求1至3中任一项所述的牵引变流器，其特征在于，所述四象限整流器的数量为2个，所述三相逆变器的数量为2个，每个所述三相逆变器连接的牵引电机的数量为2个，且每个所述三相逆变器连接的2个牵引电机设置在动车的一个转向架上。The traction converter according to any one of claims 1 to 3, wherein the number of the four-quadrant rectifiers is two, and the number of the three-phase inverters is two, each of which The number of traction motors connected to the three-phase inverter is two, and two traction motors connected to each of the three-phase inverters are disposed on one bogie of the motor vehicle.
  7. 根据权利要求6所述的牵引变流器，其特征在于，还包括：第一预充电电路和第二预充电电路，用于在所述牵引变流器初始上电时控制输入电流的变化幅度；The traction converter of claim 6 further comprising: a first pre-charging circuit and a second pre-charging circuit for controlling a magnitude of change in the input current when said traction converter is initially powered up ;
    所述第一预充电电路的输入端与牵引变压器的二次侧输出绕组P1连接，所述第一预充电电路的输出端与第一四象限整流器的第一输入端连接，所述第一四象限整流器的第二输入端与所述牵引变压器的二次侧输出绕组N1连接；The input end of the first pre-charging circuit is connected to the secondary side output winding P1 of the traction transformer, and the output end of the first pre-charging circuit is connected to the first input end of the first four-quadrant rectifier, the first four a second input end of the quadrant rectifier is connected to the secondary side output winding N1 of the traction transformer;
    所述第二预充电电路的输入端与牵引变压器的二次侧输出绕组P2连接，所述第二预充电电路的输出端与第二四象限整流器的第一输入端连接，所述第二四象限整流器的第二输入端与所述牵引变压器的二次侧输出绕组N2连接。The input end of the second pre-charging circuit is connected to the secondary side output winding P2 of the traction transformer, and the output end of the second pre-charging circuit is connected to the first input end of the second four-quadrant rectifier, the second four A second input of the quadrant rectifier is coupled to the secondary side output winding N2 of the traction transformer.
  8. 根据权利要求7所述的牵引变流器，其特征在于，所述第一预充电电路包括第一开关、第二开关和电阻，所述第二预充电电路包括第三开关；The traction converter according to claim 7, wherein the first pre-charging circuit comprises a first switch, a second switch and a resistor, and the second pre-charging circuit comprises a third switch;
    所述第一开关和所述电阻串联后与所述第二开关并联。 The first switch and the resistor are connected in series and are connected in parallel with the second switch.
PCT/CN2014/094052 2014-12-02 2014-12-17 Traction converter of bus voltage detection circuit having double voltage sensor WO2016086459A1 (en)

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