CN104090182A - Alternating current electrified railway traction network impedance frequency characteristic testing device - Google Patents
Alternating current electrified railway traction network impedance frequency characteristic testing device Download PDFInfo
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Abstract
一种交流电气化铁道牵引网阻抗频率特性测试装置，由降压变压器TP、谐波源HS、监控装置MC、电压传感器TV、电流传感器TA构成。监控装置MC控制谐波源HS发出谐波电流，通过降压变压器TP原边绕组注入到牵引网中；电压传感器TV、电流传感器TA分别检测接触网T和钢轨G之间谐波电压和向牵引网注入的谐波电流，监控装置MC接收电压传感器TV和电流传感器TA的输出信号，完成谐波阻抗计算。在接触网通电情况下即可通过调整谐波源发出电流的频率和幅值，获得牵引网的阻抗频率特性，进而得到谐振频率。本发明可用于新建电气化铁路的联调联试，也可用于既有线路，为解决谐振问题、保障供电安全提供技术支持。
A testing device for impedance-frequency characteristics of an AC electrified railway traction network is composed of a step-down transformer TP, a harmonic source HS, a monitoring device MC, a voltage sensor TV, and a current sensor TA. The monitoring device MC controls the harmonic source HS to emit harmonic current, which is injected into the traction network through the primary winding of the step-down transformer TP; the voltage sensor TV and current sensor TA respectively detect the harmonic voltage between the catenary T and the rail G and the direction of the traction network. The monitoring device MC receives the output signals of the voltage sensor TV and the current sensor TA to complete the harmonic impedance calculation. When the catenary is energized, the impedance frequency characteristics of the traction network can be obtained by adjusting the frequency and amplitude of the current sent by the harmonic source, and then the resonance frequency can be obtained. The invention can be used for joint commissioning and testing of new electrified railways, and can also be used for existing lines, and provides technical support for solving resonance problems and ensuring power supply safety.
Description
Technical field
The invention belongs to electric railway technical field, specifically, relate to a kind of ac electrified railway impedance of traction electric network frequency characteristic test device.
Background technology
Along with China's electric railway AC Drive Technology development, hand over orthogonal type electric locomotive and motor train unit to start to put into operation in a large number, the straight rectification type electric locomotive of old friendship will progressively be eliminated.Hand over the net side converter of orthogonal type electric locomotive and motor train unit generally to adopt width modulation (Pulse width modulation, PWM) four-quadrant rectifier of control technology, and the net side converter of different dynamic unit adopts Phase Shift Control Study, make current on line side harmonic content, particularly 3,5,7 inferior low-order harmonic content, significantly reduce than old electric locomotive.But the harmonic spectrum of current on line side also broadens simultaneously, near the integral multiple of net side converter power tube switching frequency, often there is very important harmonic components.In the time that the harmonic current of electric locomotive and motor train unit coincides with certain section (being generally a supply arm) traction net self resonance frequency, just may inspire higher harmonic resonance phenomenon on the net in traction, produce resonance overvoltage, affect power supply safety.China is since railway in 2007 is implemented the sixth time speed-raising, along with HX
dseries is handed over putting into operation gradually of orthogonal type electric locomotive and CRH series motor train unit, in Beijing-Harbin line, Beijing-Tianjin inter-city railway, Harbin-Dalian railway line, close in the electric railways such as Wu Kezhuan, military wide visitor be special, all there is traction net higher harmonic resonance accident, these accidents cause contact net lightning arrester to explode the consequences such as damage, the damage of locomotive high-voltage electrical equipment, electric substation's feeder line tripping operation conventionally, and electric railway normal transport order is caused to very large interference.In the combined test stage of newly built railway, distribute in the urgent need to impedance frequency characteristic and the resonance frequency of grasping each power supply section traction net, to take early specific aim technical measures at present.But, owing to drawing the impedance frequency characteristic of net except outside the Pass having with electric railway traction power supply system self electrical structure and electric parameter, also relevant with the impedance frequency characteristic of traction substation high pressure (110kV or 220kV or 330kV) inlet wire, and due to the complicacy of power system network structure and load condition, the impedance frequency characteristic of high pressure inlet wire cannot accurately calculate, even if it is very detailed that this just causes the basic data of electric railway traction power supply system to grasp, still cannot make prediction to the resonance frequency of each section traction net.Utilize measuring technology, by the method for on-the-spot test, obtain the electric railway impedance frequency characteristic of section traction net of respectively powering, thereby show that resonance frequency just seems very necessary accurately.At present, all there is no to be used for the special arrangement of ac electrified railway impedance of traction electric network frequency characteristic test both at home and abroad, relevant technical research is also blank substantially.
Summary of the invention
Object of the present invention is just to provide a kind of ac electrified railway impedance of traction electric network frequency characteristic test device.
Technical scheme of the present invention:
A kind of ac electrified railway impedance of traction electric network frequency characteristic test device, is made up of step-down transformer TP, harmonic source HS, supervising device MC, voltage sensor TV, current sensor TA; Current sensor TA connects with the first side winding of step-down transformer TP, and this cascaded structure is connected between contact net T and rail G, the harmonic current I that current sensor TA injects to contact net T for measuring step-down transformer first side winding
1h; Voltage sensor TV is connected between contact net T and rail G, for measuring the harmonic voltage U between contact net T and rail G
1h; The secondary side winding of step-down transformer TP connects harmonic source HS, and harmonic source HS realizes with electronic power convertor, under the control of supervising device MC, sends harmonic current I to step-down transformer time limit winding
2h; Supervising device is accepted the output signal of voltage sensor TV and current sensor TA, completes harmonic impedance and calculates, and realize the control that harmonic source HS is sent to frequency and the amplitude of harmonic current.
Beneficial effect of the present invention:
Between the contact net of ac electrified railway traction net and rail, connect an electrified railway traction networks impedance frequency characteristic proving installation, in traction guipure electricity situation, obtain as excitation, the method that detects harmonic voltage response the impedance frequency characteristic that traction is netted by initiatively injecting a harmonic current.The invention solves the technical barrier that utilizes emulated computation method cannot accurately obtain impedance of traction electric network frequency characteristic and resonance frequency, can be existing railway and newly built railway provides the harmonic impedance data of each power supply section and resonance frequency to distribute, so that before opening, take resonance control measures for the section of easy generation car net higher harmonic resonance.
Brief description of the drawings
Fig. 1 is ac electrified railway impedance of traction electric network frequency characteristic test device principle of compositionality figure.
Fig. 2 is ac electrified railway impedance of traction electric network frequency characteristic test device principle of work schematic diagram.Fig. 2 (a) represents that proving installation is for direct feeding system traction net, and Fig. 2 (b) represents that proving installation is for AT Supplied Catenary System.
Fig. 3 is ac electrified railway impedance of traction electric network frequency characteristic test device embodiment mono-schematic diagram.
Fig. 4 is ac electrified railway impedance of traction electric network frequency characteristic test device embodiment bis-schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Figure 1, it is made up of step-down transformer TP, harmonic source HS, supervising device MC, voltage sensor TV, current sensor TA the principle of compositionality of ac electrified railway impedance of traction electric network frequency characteristic test device of the present invention; Current sensor TA connects with the first side winding of step-down transformer TP, and this cascaded structure is connected between contact net T and rail G, the harmonic current I that current sensor TA injects to contact net T for measuring step-down transformer first side winding
1h; Voltage sensor TV is connected between contact net T and rail G, for measuring the harmonic voltage U between contact net T and rail G
1h; The secondary side winding of step-down transformer TP connects harmonic source HS, and harmonic source HS realizes with electronic power convertor, under the control of supervising device MC, sends harmonic current I to step-down transformer time limit winding
2h; Supervising device is accepted the output signal of voltage sensor TV and current sensor TA, completes harmonic impedance and calculates, and realize the control that harmonic source HS is sent to frequency and the amplitude of harmonic current.
The principle of work of ac electrified railway impedance of traction electric network frequency characteristic test device is: this proving installation utilizes harmonic source to produce a harmonic current that frequency is adjustable, using the harmonic current injection producing on charged contact net as encouraging, for reducing background harmonics interference requirement electric locomotive and motor train unit that now same traction net power supply section is not being got stream, this proving installation injects traction net harmonic current measuring in, detect the voltage responsive of traction net, extract the harmonic voltage component with harmonic current same frequency, harmonic voltage just obtains harmonic impedance divided by harmonic current.Regulate harmonic source to produce the frequency of harmonic current, being allowed to condition at 10Hz～5000Hz scope changes at certain intervals, just can obtain drawing the actual measurement impedance of traction electric network value of net under different frequency, according to the distribution characteristics of impedance of traction electric network frequency characteristic, get its extreme point, just can obtain resonance frequency.
Principle of work can be illustrated by Fig. 2.In Fig. 2, SS represents traction substation, and T represents contact net, and G represents rail, and F represents positive feeder, AT
1, AT
2, AT
3represent three autotransformers.Fig. 2 (a) represents that proving installation is for direct feeding system traction net, and Fig. 2 (b) represents that proving installation is for AT Supplied Catenary System.Under two kinds of power supply modes, proving installation is connected between contact net T and rail G, injects a frequency controlled (10～5000Hz), harmonic current I that amplitude is adjustable to traction net
1h, as the excitation of traction net, proving installation detects the voltage responsive of traction net simultaneously, obtains the harmonic voltage U between electric current injection place contact net T and rail G
1h, harmonic voltage U
1hdivided by harmonic current I
1hcan obtain harmonic impedance, allow the frequency of harmonic current change continuously, just can obtain the impedance of traction electric network under different frequency, thereby can draw out impedance of traction electric network frequency characteristic.
In embodiment illustrated in fig. 3 one, formed by pantograph PG, circuit breaker Q F, voltage sensor TV, current sensor TA, step-down transformer TP, harmonic source HS and supervising device MC, be arranged on a railway with in railcar, be connected to contact net T by pantograph PG, by rail wheel to being connected to rail G; Step-down transformer TP first side winding rated voltage is by traction net rated voltage value, and secondary side winding rated voltage value and harmonic source HS match, and scope is 200V～2000V; Voltage sensor TV realizes by electromagnetic potential transformer or RC divider, and current sensor TA realizes with electromagnetic current transducer or Hall current sensor; Harmonic source HS is made up of single-phase H bridge current transformer UC and driving circuit, and the device for power switching of single-phase H bridge current transformer adopts IGBT or IGCT or MOSFET; Supervising device MC is made up of measurement module, human-computer interaction module and control module, realized by microprocessor system, wherein, the detection signal of measurement module receiver voltage sensor TV and current sensor TA, realize impedance measurement, human-computer interaction module is for test pattern and the setting of harmonic source parameter and the output of measurement result and demonstration, and control module is for sending according to setting test pattern control harmonic source HS the harmonic current that frequency is controlled, amplitude is adjustable.In Fig. 3, I
2hfor the harmonic current that harmonic source HS produces, I
1hfor step-down transformer first side winding harmonic current, U
1hfor the harmonic voltage between contact net T and rail G.
In two schematic diagram embodiment illustrated in fig. 4, (only draw mono-difference with embodiment): step-down transformer secondary side adopts many winding configurations, secondary side is provided with n, and (n is integer, 2≤n≤8) individual winding, a harmonic source of the each connection of each secondary side winding, harmonic source is realized by electronic power convertor, n harmonic source (HS
1, HS
2..., HS
n) jointly produce and measure the harmonic current needing, n harmonic source adopted to PWM Phase Shift Control Study, improve step-down transformer first side winding current waveform and also reduce the requirement to device for power switching.In Fig. 4, I
2h1for harmonic source HS
1the harmonic current producing, I
2h2for harmonic source HS
2the harmonic current producing, I
2hnfor harmonic source HS
nthe harmonic current producing, I
1hfor step-down transformer first side winding harmonic current.
Claims (5)
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| CN104991117A (en) * | 2015-06-15 | 2015-10-21 | 中国科学院电工研究所 | Test method for resonant frequency of DC unit of smart router |
| CN105353221A (en) * | 2015-12-01 | 2016-02-24 | 西南交通大学 | Traction network impedance on-line testing device and test method |
| CN105629071A (en) * | 2016-03-28 | 2016-06-01 | 西南交通大学 | Electric railway locomotive impedance testing device and method |
| CN105699779A (en) * | 2015-12-31 | 2016-06-22 | 北京交通大学 | Cascaded H-bridge type traction network impedance test harmonic generator and test method |
| CN105743072A (en) * | 2016-03-01 | 2016-07-06 | 中国铁道科学研究院 | High-voltage electric circuit protection system for electric motor train unit |
| CN105738705A (en) * | 2016-04-08 | 2016-07-06 | 西南交通大学 | Harmonic wave impedance measuring device and measuring method for traction power supply system |
| CN106154034A (en) * | 2015-04-14 | 2016-11-23 | 艾默生网络能源有限公司 | The harmonic measuring device of a kind of power model and method |
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| CN107247185A (en) * | 2017-06-05 | 2017-10-13 | 西南交通大学 | Tractive power supply system harmonic impedance measurement device and its test method |
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| CN106154034B (en) * | 2015-04-14 | 2019-10-15 | 维谛技术有限公司 | A kind of harmonic measuring device and method of power module |
| CN104991117A (en) * | 2015-06-15 | 2015-10-21 | 中国科学院电工研究所 | Test method for resonant frequency of DC unit of smart router |
| CN104991117B (en) * | 2015-06-15 | 2018-01-12 | 中国科学院电工研究所 | The method of testing of intelligent router direct current component resonant frequency |
| CN105353221B (en) * | 2015-12-01 | 2018-04-24 | 西南交通大学 | A kind of impedance of traction electric network online testing device and its test method |
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| CN105743072A (en) * | 2016-03-01 | 2016-07-06 | 中国铁道科学研究院 | High-voltage electric circuit protection system for electric motor train unit |
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Inventor after: Wu Mingli Inventor after: Wu Liran Inventor after: Yang Shaobing Inventor after: Zhang Honghe Inventor after: Liu Qiujiang Inventor before: Wu Mingli Inventor before: Wu Liran Inventor before: Yang Shaobing Inventor before: Zhang Honghe |
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Granted publication date: 20170613 |
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| CF01 | Termination of patent right due to non-payment of annual fee |