CN112537230B - Ground phase selection control system and method for electrified rail transit - Google Patents
Ground phase selection control system and method for electrified rail transit Download PDFInfo
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Abstract
本发明公开了一种用于电气化轨道交通的地面选相控制过分相系统及方法，选相控制过分相系统由两个对称的部分组成，包括线路电压电流采集模块、位置信号感应模块、通信模块、主控模块、选相开关模块、开关切换模块和空闲保护模块；选相过分相过程为：当电力机车进行过分相时，其要从A相供电臂经中性段进入到B相供电臂，会依次经过铁轨上的三个位置传感器，两个选相控制器控制对应的地面开关模块进行分合闸操作。本发明能实现自动选相过分相功能，有效解决了分闸过电压、合闸励磁涌流和开关拉弧的问题；本发明还兼具电力电子开关冗余备用功能、空闲保护功能以及人机交互功能。
The invention discloses a ground phase selection control over-phase separation system and method for electrified rail transit. The phase selection control over-phase separation system is composed of two symmetrical parts, including a line voltage and current acquisition module, a position signal sensing module and a communication module , the main control module, the phase selection switch module, the switch switch module and the idle protection module; the phase selection and phase separation process is: when the electric locomotive is over-phased, it must enter the B-phase power supply arm from the A-phase power supply arm through the neutral section. , will pass through the three position sensors on the rail in turn, and the two phase selection controllers will control the corresponding ground switch modules to perform the opening and closing operations. The invention can realize the function of automatic phase selection and phase separation, and effectively solve the problems of opening overvoltage, closing excitation inrush current and switch arcing; the invention also has the redundant backup function of power electronic switch, idle protection function and human-computer interaction. Function.
Description
Technical Field
The invention belongs to the field of electrified rail transit, and particularly relates to a ground phase selection control passing neutral-section system and method for electrified rail transit.
Background
The electrified railway in China adopts a power supply mode of 27.5KV single-phase power-frequency alternating current to supply power to the electric locomotive, and in order to ensure that the current taking of the electrified railway from a three-phase power grid of an electric power system is basically symmetrical and reduce the influence of the electrified railway on the negative sequence component of the electric power system, the electrified railway adopts a mode of sectional current taking and phase change connection. Different phases have a phase change transition region when connected, which is called an electric phase separation region. According to different electric phase splitting modes, the electric locomotive passing phase splitting mode is divided into a phase splitting insulator electric phase splitting mode and an anchor section articulated electric phase splitting mode, and in order to enable the electric locomotive to rapidly and smoothly pass through an electric phase splitting area, the electric locomotive usually adopts an articulated automatic passing phase splitting mode.
At present, most of electric locomotives of high-speed railways in China adopt a joint type automatic passing phase mode, and the wide application of the mode ensures that the wide scientific research personnel and engineering technical personnel have to pay attention to the electrical problem of the passing phase process. In the process of automatic passing through neutral section of the electric locomotive, the electric locomotive realizes two-phase electric switching through a switching vacuum circuit breaker to smoothly pass through an electric phase-splitting area, the operation of the switching vacuum circuit breaker is equivalent to switching the load of the electric locomotive, and the switching of a circuit and various dynamic elements in the electric locomotive inevitably excite electromagnetic oscillation phenomena, such as switching-off overvoltage, switching-on excitation inrush current, switch arc discharge and the like, which may cause serious damages such as damage of vehicle-mounted electric equipment, misoperation of a relay protection device and the like, and influence the safe operation of the electrified railway.
The method is characterized in that the method is started in the process of automatic passing through the neutral section of the electric locomotive, the switching-off overvoltage mainly depends on the phase of the line current before the switch is switched off, and the switching-on magnetizing inrush current mainly depends on the phase of the line voltage before the switch is switched on. Aiming at the conclusion, the phase of line voltage or current during the closing of the switch can be controlled by utilizing a phase selection control technology, so that the switching-off overvoltage and the switching-on excitation inrush current generated by the passing neutral section of the electric locomotive are reduced or even eliminated, the stability and the safety of a system are improved, and the service life of electric equipment is prolonged.
At present, the existing ground automatic passing neutral section devices in China all adopt mechanical switches represented by vacuum circuit breakers as switching devices of two adjacent phases. However, with the development of power electronic technology, the performance of the power electronic switch is more and more excellent, and compared with the traditional mechanical switch, the power electronic switch has the advantages of shorter switching time, longer service life, basically unlimited switching times and the like. However, the application of the power electronic switch to the electrified railway is limited due to the problem of voltage resistance of the power electronic switch.
Disclosure of Invention
The problem of the current electric locomotive passing neutral section produced separating brake overvoltage, closing excitation surge current and switch arc discharge is solved, and how to apply the power electronic switch to the electric locomotive passing neutral section is solved. The invention provides a ground phase selection control passing neutral section system and method for electrified rail transit.
The invention discloses a ground phase selection control passing neutral section system for electrified rail transit, which consists of two symmetrical parts, wherein one part is a phase selection controller for controlling a switching neutral section of an A-phase power supply arm, and the other part is a phase selection controller for controlling a switching neutral section of a B-phase power supply arm; and the two phase selection controllers control the opening and closing of the ground switch module.
The ground switch module at least comprises a phase selection switch module which is a bidirectional switch unit composed of an IGBT and a power diode.
The voltage transformer and the current transformer respectively collect voltage and current signals and transmit the voltage and current signals to the AD conversion module to form a line voltage and current collection module.
A first position sensor, a second position sensor and a third position sensor are sequentially arranged on a section of the rail corresponding to the A-phase power supply arm, the neutral section and the B-phase power supply arm to form a position signal sensing module.
The line voltage and current acquisition module and the position signal induction module transmit information to the main control module, and the main control module is connected with the ground console through the signal module so as to control the ground switch module.
Furthermore, the ground switch module also comprises a switch switching module, and the switch switching module is formed by connecting two isolating switches in parallel with two bidirectional switch units respectively and is used for isolating the failed bidirectional switch unit.
Further, the bidirectional switch unit is specifically: one end of the switch unit is connected with the collector of the IGBT1 and the cathode of the diode D2, the emitter of the IGBT1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the other end of the switch unit; the anode of the diode D2 is connected with the emitter of the IGBT2, and the collector of the IGBT2 is connected with the other end of the switch unit; the gates of the IGBT1 and IGBT2 are drive-controlled by drive signals generated by the phase selection controller.
Furthermore, a step-down transformer and a circuit breaker are arranged between the ground switch module and the A-phase power supply arm, the neutral section and the B-phase power supply arm, and the circuit breaker and the phase selection controller form an idle protection module.
The invention discloses a ground phase selection control passing neutral section method for electrified rail transit, which uses the ground phase selection control passing neutral section system for the electrified rail transit, and specifically comprises the following steps:
the first position sensor, the second position sensor and the third position sensor are sequentially arranged on the rail;
when the electric locomotive passes through the first position sensor, the first phase selection controller controls the phase selection switching-on operation of the corresponding ground switch module to complete the function of enabling the neutral section to be connected with the A-phase power supply arm;
when the electric locomotive passes through the second position sensor, the first phase selection controller controls the phase selection switching-off operation of the corresponding ground switch module, and the second phase selection controller controls the phase selection switching-on operation of the corresponding ground switch module, so that the process of enabling the neutral section 3 to be transited from the connection with the A-phase power supply arm to the connection with the B-phase power supply arm is completed;
when the electric locomotive passes through the third position sensor, the second phase selection controller controls the phase selection and switching-off operation of the corresponding ground switch module, the function of disconnecting the neutral section 3 from the B-phase power supply arm is completed, and the passing phase of the electric locomotive is finished.
The specific steps of the phase selection and switching-off operation are as follows:
when the position sensor senses that the electric locomotive runs to a position needing to be subjected to brake opening, the position sensor sends a corresponding signal, the signal is processed by the signal conditioning part and then transmitted to the main control modules of the two phase selection controllers in the phase selection control phase separation system, the main control modules of the two phase selection controllers receive and immediately process the signal, and whether the phase selection controllers need to be subjected to brake opening or brake closing operation or not is judged, so that the phase selection controllers which correspondingly need to be subjected to brake opening operation perform brake opening action, and the phase selection controllers which do not need to be subjected to brake opening operation do not act; the phase selection controller for switching off sends a line current acquisition instruction to a line voltage and current acquisition module of the phase selection controller, the current is transmitted to an AD conversion module, and a processed line current analog signal is finally converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module; after receiving the signal, the main control module sends a switching-off instruction to drive the phase selection switch module to act at the line current target phase moment after processing; and after receiving the switching-off instruction, the phase selection switch module stops supplying current to the gate pole of the IGBT module by the driving circuit to turn off the corresponding IGBT, so that the neutral section is disconnected with the power supply arm controlled by the phase selection controller, and the phase selection switching-off operation is completed.
The phase selection and closing operation comprises the following specific steps:
when the position sensor senses that the electric locomotive runs to a position where the phase selection switch needs to be switched on, the position sensor sends a corresponding signal; the signal is processed by the signal conditioning part and then transmitted to the main control modules of the two phase selection controller parts in the phase selection control split-phase system, the main control modules of the two phase selection controller parts receive and immediately process the signal and judge whether the phase selection controller needs to perform switching-off or switching-on operation, so that the phase selection controller which needs to perform switching-on operation correspondingly performs switching-on operation, and the phase selection controller which does not need to perform switching-off operation does not operate; the phase selection controller for switching off sends a line voltage acquisition instruction to a line voltage and current acquisition module of the phase selection controller, the line voltage acquisition instruction is transmitted to an AD conversion module, and a processed line voltage analog signal is converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module; after receiving the signal, the main control module sends a closing instruction to drive the phase selection switch module to act at the line voltage target phase moment after processing; and after receiving a closing instruction, the phase selection switch module starts a driving circuit to supply current to a gate pole of the IGBT module so as to turn on the corresponding IGBT, so that the neutral section is connected with a power supply arm controlled by the phase selection controller, and the phase selection closing operation is finished.
Still include the redundant standby function of power electronic switch, specifically do:
when the bidirectional switch unit fails, the detection circuit detects failure information and transmits the failure information to the main control module, the main control module immediately sends an instruction to actuate the switch switching module, the failed bidirectional switch unit is short-circuited by the isolating switch, and the standby bidirectional switch unit is connected into the circuit, so that the switching of the standby bidirectional switch unit is completed.
Still include the idle protection ability of power electronic switch, specifically do:
when the electric locomotive passes through the neutral section, the phase selection controller sends a breaker switching-on instruction, the breaker is closed before the electric locomotive passes through the neutral section, and the neutral section selection controller controls the neutral section passing system to normally work; when the electric locomotive passes through the neutral section, the phase selection controller immediately sends a breaker opening instruction, the idle protection module acts, and the breaker opens.
Compared with the prior art and the structure, the invention has the beneficial effects that:
1. when the electric locomotive passes through the neutral section, a ground phase selection control neutral section passing system for electrified rail transit is adopted to carry out phase selection control on a ground switch, so that severe electromagnetic oscillation such as switching-off overvoltage, switching-on inrush current and the like generated by immediate switching-on and switching-off of the ground switch is greatly reduced or even eliminated, and the operation safety of an electrified railway is improved.
2. By applying the method of the invention, namely, the IGBT is applied to the passing phase of the electric locomotive through the three step-down transformers, and the IGBT bidirectional switch is used for replacing the traditional ground mechanical switch, thereby overcoming the defects of longer switching time, shorter service life and limited switching times of the traditional mechanical switch.
3. The ground phase selection control passing neutral section system for the electrified rail transit is provided with the redundant standby function of the IGBT bidirectional switches, and the two groups of IGBT bidirectional switches are mutually standby, so that the reliability of the whole phase selection control system and the running safety of an electrified railway are improved.
4. The novel ground phase selection control passing neutral section system for the electrified rail transit is provided with an idle protection function, so that the phase selection control passing neutral section system is disconnected with a traction network when an electric locomotive does not carry out passing neutral section, and the damage to the phase selection control passing neutral section system caused by the fluctuation of certain parameters of the traction network is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a ground phase selection control passing neutral section system for electrified rail transit.
FIG. 2 is a schematic block diagram of a phase selection controller control structure according to the present invention.
Fig. 3 is a switching-on and switching-off flow chart of the phase selection control system.
FIG. 4 is a timing chart of the switching-off and phase-selecting control according to the present invention.
Fig. 5 is a timing diagram of the switching-on phase selection control of the present invention.
Fig. 6 is a schematic circuit diagram of a bidirectional switch unit.
In the drawings, the numbers are explained as follows:
the system comprises a 1-A phase power supply arm, a 2-B phase power supply arm, a 3-neutral section, a 4-steel rail, a 5-electric locomotive, a 6-bogie, a 7-wheel pair, an 8-vehicle-mounted main transformer, a 9-first position sensor, a 10-second position sensor, a 11-third position sensor, a 12-first phase selection controller, a 13-second phase selection controller, a 14-ground switch module, a 15-isolating switch, a 16-IGBT, a 17-power diode, an 18-voltage transformer, a 19-current transformer, a 20-step-down transformer, a 21-circuit breaker, a 22-line voltage and current acquisition module, a 23-position signal induction module, a 24-communication module, a 25-main control module, a 26-phase selection switch module, 27-switch switching module, 28-idle protection module.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The invention discloses a ground phase selection control split-phase system for electrified rail transit, which is shown in figure 1 and comprises two symmetrical parts, wherein one part is a first phase selection controller 12 for controlling a phase A power supply arm 1 to switch a neutral section 3, and the other part is a second phase selection controller 13 for controlling a phase B power supply arm 2 to switch the neutral section 3; and the two phase selection controllers control the opening and closing of the ground switch module 14.
The ground switch module 14 comprises at least one phase selection switch module 26, and the phase selection switch module 26 is a bidirectional switch unit composed of an IGBT16 and a power diode 17.
As shown in fig. 2, the voltage transformer 18 and the current transformer 19 respectively collect voltage and current signals and transmit the signals to the AD conversion module, so as to form a line voltage and current collection module 22.
The first position sensor 9, the second position sensor 10 and the third position sensor 11 are sequentially installed on the corresponding sections of the A-phase power supply arm 1, the neutral section 3 and the B-phase power supply arm 2 on the rail 4 to form a position signal sensing module 23.
The line voltage and current acquisition module 22 and the position signal sensing module 23 transmit information to the main control module 25, and the main control module 25 is connected to the ground console through the signal module 24, so as to control the ground switch module 14.
Further, the ground switch module 14 further includes a switch switching module 27, where the switch switching module 27 is formed by connecting two isolating switches 15 in parallel with two bidirectional switch units, respectively, and is used for isolating a faulty bidirectional switch unit.
Further, as shown in fig. 6, the bidirectional switch unit specifically includes: one end of the switch unit is connected with the collector of the IGBT1 and the cathode of the diode D2, the emitter of the IGBT1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the other end of the switch unit; the anode of the diode D2 is connected with the emitter of the IGBT2, and the collector of the IGBT2 is connected with the other end of the switch unit; the gates of the IGBT1 and IGBT2 are drive-controlled by drive signals generated by the phase selection controller.
Further, a step-down transformer 20 and a circuit breaker 21 are arranged between the ground switch module 14 and the a-phase power supply arm 1, the neutral section 3 and the B-phase power supply arm 2, and the circuit breaker 21 and the phase selection controller form an idle protection module 28.
The invention discloses a ground phase selection control passing neutral section method for electrified rail transit, which uses the ground phase selection control passing neutral section system for the electrified rail transit, and specifically comprises the following steps:
the first position sensor 9, the second position sensor 10 and the third position sensor 11 are sequentially arranged on the rail 4;
when the electric locomotive 5 passes through the first position sensor 9, the first phase selection controller 12 controls the phase selection switching-on operation of the corresponding ground switch module 14 to complete the function of enabling the neutral section 3 to be connected with the A-phase power supply arm 1;
when the electric locomotive 5 passes through the second position sensor 10, the first phase selection controller 12 controls the phase selection switching-off operation of the corresponding ground switch module 14, and the second phase selection controller 13 controls the phase selection switching-on operation of the corresponding ground switch module 14, so that the process of enabling the neutral section 3 to be transited from the connection with the phase A power supply arm to the connection with the phase B power supply arm is completed;
when the electric locomotive 5 passes through the third position sensor 11, the second phase selection controller 13 controls the phase selection and opening operation of the corresponding ground switch module 14, so that the function of disconnecting the B-phase power supply arm from the neutral section 3 is completed, and the electric locomotive passing through the phase separation is finished.
The phase selection and switching-off operation is shown in fig. 3, and the specific steps are as follows:
when the position sensor senses that the electric locomotive 5 runs to a position where switching-off is needed, the position sensor sends a corresponding signal, the signal is processed by the signal conditioning part and then transmitted to the main control modules 25 of the two phase selection controllers in the phase selection control switching-off system, the main control modules 25 of the two phase selection controllers receive and immediately process the signal, and whether switching-off or switching-on operation is needed or not is judged, so that the phase selection controller which correspondingly needs switching-off operation performs switching-off action, and the phase selection controller which does not need switching-off operation does not act; the phase selection controller performing the switching-off operation sends a line current acquisition instruction to its own line voltage and current acquisition module 22, and the load current in the line is converted into a current of an appropriate magnitude by the current transformer. Because the current has partial harmonic component besides the fundamental component, which affects the precision of phase selection control, the filtering link is set to reduce the harmonic component of the circuit, after processing, the acquired current waveform basically meets the requirement, and then the current is transmitted to the AD conversion module, and in the AD conversion module, the processed line current analog signal is finally converted into a corresponding digital signal and then transmitted to the main control module 25; after receiving the signal, the main control module 25 processes the signal and sends a switching-off instruction to drive the phase selection switch module 26 to operate at the line current target phase moment; after receiving the switching-off instruction, the phase selection switch module 26 stops supplying current to the gate of the IGBT module by the driving circuit, so that the corresponding IGBT is turned off, and the neutral section is disconnected from the power supply arm controlled by the phase selection controller, thereby completing the phase selection switching-off operation.
The phase selection and closing operation is shown in fig. 3, and the specific steps are as follows:
when the position sensor senses that the electric locomotive runs to a position where the phase selection switch needs to be switched on, the position sensor sends a corresponding signal; the signal is processed by the signal conditioning part and then transmitted to the main control modules 25 of the two phase selection controller parts in the phase selection control split-phase system, the main control modules 25 of the two phase selection controller parts receive and immediately process the signal and judge whether the phase selection controller needs to perform switching-off or switching-on operation, so that the phase selection controller which correspondingly needs switching-on operation performs switching-on action, and the phase selection controller which does not need switching-off operation does not act; the phase selection controller performing the switching-off operation sends a line voltage acquisition instruction to its own line voltage and current acquisition module 22, and the line voltage is converted into a voltage with an appropriate magnitude by the voltage transformer. Because the voltage has partial harmonic component besides the fundamental component, which affects the precision of phase selection control, the filtering link is set to reduce the harmonic component of the voltage, after processing, the acquired voltage waveform basically meets the requirement, and the voltage is immediately transmitted to the AD conversion module, and in the AD conversion module, the line voltage analog signal obtained by processing is converted into a corresponding digital signal and is immediately transmitted to the main control module 25; after receiving the signal, the main control module 25 processes the signal and sends a closing instruction to drive the phase selection switch module 26 to operate at the target phase of the line voltage; after receiving the switching-on instruction, the phase selection switch module 26 starts the drive circuit to supply current to the gate pole of the IGBT module, so that the corresponding IGBT is turned on, and the neutral section is connected to the power supply arm controlled by the phase selection controller, thereby completing the phase selection switching-on operation.
Still include the redundant standby function of power electronic switch, specifically do:
when the bidirectional switch unit has a fault, the detection circuit detects the fault information and transmits the fault information to the main control module 25, the main control module 25 immediately sends an instruction to actuate the switch switching module 27, the fault bidirectional switch unit is short-circuited by the isolating switch 15, and the standby bidirectional switch unit is connected into the circuit, so that the switching of the standby bidirectional switch unit is completed.
Still include the idle protection ability of power electronic switch, specifically do:
when the electric locomotive passes through the neutral section, the neutral section controller sends a breaker switching-on instruction, the breaker 21 is closed before the electric locomotive passes through the neutral section, and the neutral section passing system is controlled to normally work by neutral section selection; when the electric locomotive passes through the neutral section, the phase selection controller immediately sends a breaker opening instruction, the idle protection module 28 acts, and the breaker 21 opens.
Still include the human-computer interaction function, specifically do:
the keyboard module and the LCD display module in the communication module 24 and the main control module 25 in FIG. 2. The working state of the phase selection controller and the running state of each device of the phase selection control over-neutral-section system are displayed in real time through the LCD display module, so that people can conveniently detect and protect the phase selection control over-neutral-section system. The keyboard module is arranged, related personnel can directly send instructions manually through the keyboard module to close the phase selection switch, and the switch can not act when the phase selection control passing through the phase selection system fails. The remote communication module is arranged, and related ground workers can monitor each phase selection control passing neutral section system of the electrified railway in real time, so that the safety of the operation of the electrified railway is enhanced.
At present, the electrified railway in China uses mechanical switches represented by vacuum circuit breakers in the technology of automatic neutral section passing of electric locomotives, and compared with power electronic switches, the mechanical switches are longer in switching process, and are inferior to the power electronic switches in use times and service life, but although the power electronic switches are excellent in performance, the voltage-resistant grade of the power electronic switches can not meet the voltage grade requirement of the electrified railway, therefore, as shown in the figure I, the invention converts the voltage of 27.5KV high voltage grade in a traction network into the voltage grade which can be borne by an IGBT bidirectional switch by means of 3 step-down transformers 20, so that the IGBT bidirectional switch is safely connected into the traction network.
In the invention, the transient process of the electric locomotive when the ground switch is opened when passing the neutral section is as follows:
the transient process excited when the ground switch is opened is mainly generated by mutual resonance of equivalent capacitance and excitation inductance of a main transformer on the electric locomotive to the ground, so that a transient equation can be obtained:
in the formula: u-voltage on electric locomotive;
c, an equivalent capacitance of a main transformer of the electric locomotive to the ground;
l-excitation inductance of main transformer of electric locomotive.
The circuit theory knowledge can obtain:
in the formula: i ism-line current peak at opening;
Umsteady state voltage peak of main transformer of electric locomotive, where Um＝2πfL·Im；
a-the phase of the line current during opening;
ω0-a resonance angular frequency, wherein
From the above formula, the overvoltage multiple K of the electric locomotive is:
in the formula: f. of0Resonant frequency, where ω0＝2πf0；
f-power frequency 50 HZ.
From the above formula, it can be seen that the switching-off overvoltage is mainly related to the phase of the line current during switching-off, so that the phase of the line current is controlled to be 0 during switching-off through phase selection control, and the switching-off overvoltage can be reduced or even eliminated.
The gate-separating and phase-selecting control timing is shown in fig. 4 and can be divided into four steps. 1. t is t10At any moment, when the position sensor senses that the electric locomotive runs to a position where the phase selection switch needs to be opened, the position sensor sends out a corresponding signal and transmits the signal to the ground phase selection controller. 2. [ t ] of10-t12]And in the time period, the main control module of the phase selection controller responds to the signal of the position sensor, acquires the line current information, processes the line current information to obtain the reference zero point of the target line current, wherein [ t10-t11]The time period is the processing time of the main control module of the phase selection controller, the zero crossing time of the first phase 2k pi (k is 1, 2.) of the line current is found, and the time delay is started until the line current reaches the phase, [ t ] t11-t12]A time delay t of the main control module12The line current reaches this phase and the master control module takes t12The time is taken as the reference zero point of the main control module. 3. [ t ] of12-t14]And in the time period, the main control module carries out further processing, acquires the line current information, considers the IGBT turn-off time and finds the first point meeting the brake-off phase condition of the line current phase after the zero point reference, wherein [ t12-t13]The time period is the processing time of the main control module, [ t ]13-t14]The time period is the secondary delay time t of the main control module14And the time master control module sends a brake opening instruction, and the IGBT gate stops supplying a driving signal. 4. [ t ] of14-t15]Time period, IGBT turn-off time, t15At the moment, the IGBT bidirectional switch is turned off at the target phase of the line current, and the phase selection and the brake separation are completed.
In the invention, the transient process when the ground switch is switched on when the electric locomotive passes the neutral section:
the transient process excited by the switching-on of the ground switch is mainly generated by a circuit formed by line voltage, line impedance and a main transformer of the electric locomotive, so that a transient equation can be obtained:
in the formula: phi-main transformer magnetic flux of the electric locomotive;
r-line impedance;
N1primary side turns of a main transformer of the electric locomotive;
b-line voltage phase when the ground switch is switched on.
The circuit theory knowledge can be obtained:
in the formula: phim-steady state flux peak of main transformer of electric locomotive;
Φrresidual magnetism of a main transformer of the electric locomotive.
From the above formula, it can be seen that the switching-on magnetizing inrush current is mainly related to the phase of the line voltage during switching-on, so that the phase of the line voltage during switching-on can be controlled to be
The transient process of the magnetic flux of the main transformer of the electric locomotive can be reduced or even eliminated. Whether the electric locomotive is switched on or off in the neutral section is determined by the position of the electric locomotive in the neutral section, and the position information of the electric locomotive sensed by the existing position sensor.
The closing phase selection control sequence is shown in fig. 5 and can be divided into four steps. 1. t is t20At the moment, when the position sensor senses that the electric locomotive runs to the position where the phase selection switch needs to be switched on, the position sensor sends out a corresponding signal and transmits the signal to the ground phase selection controller. 2. [ t ] of20-t22]And in the time period, the main control module of the phase selection controller responds to the signal of the position sensor, acquires the line voltage information and processes the line voltage information to obtain the reference zero point of the line voltage, wherein [ t20-t21]Phase selection controller for time periodThe master control module processes the time to find the zero crossing point of the first phase 2k pi (k 1, 2.) of the line voltage and starts delaying until the line voltage reaches this phase, [ t ]21-t22]Is a time delay of the main control module, t22At the moment the line voltage reaches this phase and the master control module takes t22The time is taken as the reference zero point of the main control module. 3. [ t ] of22-t24]And in the time period, the main control module further processes the line voltage information, considers the IGBT turn-off time and finds the first point meeting the condition of the closing phase of the line voltage phase after the zero point reference, wherein [ t ]22-t23]The time period is the processing time of the main control module, [ t ]23-t24]Time period, which is the secondary delay time of the main control module, t24The time main control module sends a closing instruction, and the IGBT gate receives a driving signal. 4. [ t ] of24-t25]Time period, IGBT on-time, t25And at the moment, the IGBT is conducted at the target phase of the line voltage, and the phase selection and closing are completed.
Claims (4)
1. A ground phase selection control split-phase system for electrified rail transit is characterized by comprising two symmetrical parts, wherein one part is a first phase selection controller (12) for controlling a switching neutral section (3) of an A-phase power supply arm (1), and the other part is a second phase selection controller (13) for controlling a switching neutral section (3) of a B-phase power supply arm (2); the two phase selection controllers control the opening and closing of the ground switch module (14);
the ground switch module (14) at least comprises a phase selection switch module (26), and the phase selection switch module (26) is a bidirectional switch unit composed of an IGBT (16) and a power diode (17);
the voltage transformer (18) and the current transformer (19) respectively collect voltage and current signals and transmit the voltage and current signals to the AD conversion module to form a line voltage and current collection module (22);
a step-down transformer (20) and a circuit breaker (21) are arranged between the ground switch module (14) and the A-phase power supply arm (1), the neutral section (3) and the B-phase power supply arm (2), and the circuit breaker (21) and the phase selection controller form an idle protection module (28);
a first position sensor (9), a second position sensor (10) and a third position sensor (11) are sequentially arranged on a railway (4) at a road section corresponding to the A-phase power supply arm (1), the neutral section (3) and the B-phase power supply arm (2) to form a position signal sensing module (23);
line voltage electric current collection module (22) and position signal response module (23) transmit information for host system (25), and host system (25) pass through communication module (24) and connect the ground control cabinet to the divide-shut brake of control ground switch module (14), the specific step of the switching operation of selecting phases is:
when the position sensor senses that the electric locomotive (5) runs to a position needing to be subjected to brake opening, the position sensor sends a corresponding signal, the signal is processed by the signal conditioning part and then transmitted to the main control modules (25) of the two phase selection controllers in the phase selection control phase separation system, the main control modules (25) of the two phase selection controllers receive and immediately process the signal, and whether the phase selection controllers need to be subjected to brake opening or brake closing operation is judged, so that the phase selection controllers which correspondingly need to be subjected to brake opening operation perform brake opening action, and the phase selection controllers which do not need to be subjected to brake opening operation do not act; the phase selection controller for switching off sends a command for acquiring the line current to a line voltage and current acquisition module (22) of the phase selection controller, the current is transmitted to an AD conversion module, and a processed line current analog signal is finally converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module (25); after receiving the signal, the main control module (25) sends a switching-off instruction to drive the phase selection switch module (26) to act at the line current target phase moment after processing; the phase selection switch module (26) stops supplying current to the gate pole of the IGBT module by the driving circuit after receiving the switching-off instruction, so that the corresponding IGBT is switched off, the neutral section is disconnected with the power supply arm controlled by the phase selection controller, and the phase selection switching-off operation is finished;
the phase selection and closing operation comprises the following specific steps:
when the position sensor senses that the electric locomotive runs to a position where the phase selection switch needs to be switched on, the position sensor sends a corresponding signal; the signal is processed by the signal conditioning part and then transmitted to the main control modules (25) of the two phase selection controller parts in the phase selection control split-phase system, the main control modules (25) of the two phase selection controller parts receive and immediately process the signal and judge whether the phase selection controller needs to perform switching-off or switching-on operation, so that the phase selection controller which needs to perform switching-on operation correspondingly performs switching-on action, and the phase selection controller which does not need switching-off operation does not act; the phase selection controller for switching off sends a command for acquiring line voltage to a line voltage and current acquisition module (22) of the phase selection controller, the voltage is transmitted to an AD conversion module, and a processed line voltage analog signal is converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module (25); after receiving the signal, the main control module (25) sends a closing instruction to drive the phase selection switch module (26) to act at the target phase moment of the line voltage after processing; after receiving a closing instruction, the phase selection switch module (26) starts a driving circuit to supply current to a gate pole of the IGBT module so as to turn on the corresponding IGBT, so that a neutral section is connected with a power supply arm controlled by the phase selection controller, and the phase selection closing operation is finished;
the ground switch module (14) also comprises a switch switching module (27), and the switch switching module (27) is formed by connecting two isolating switches (15) in parallel with two bidirectional switch units respectively and is used for isolating the failed bidirectional switch unit;
the bidirectional switch unit is specifically as follows: one end of the switch unit is connected with the collector of the IGBT1 and the cathode of the diode D2, the emitter of the IGBT1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the other end of the switch unit; the anode of the diode D2 is connected with the emitter of the IGBT2, and the collector of the IGBT2 is connected with the other end of the switch unit; the gates of the IGBTs 1 and 2 are drive controlled by the drive signal generated by the phase selection controller.
2. The phase selection control passing phase method of the ground phase selection control passing phase system for the electrified rail transit as claimed in claim 1, is characterized in that:
the first position sensor (9), the second position sensor (10) and the third position sensor (11) are sequentially arranged on the rail (4);
when the electric locomotive (5) passes through the first position sensor (9), the first phase selection controller (12) controls the phase selection and closing operation of the corresponding ground switch module (14) to complete the function of enabling the neutral section (3) to be connected with the A-phase power supply arm (1);
when the electric locomotive (5) passes through the second position sensor (10), the first phase selection controller (12) controls the phase selection switching-off operation of the corresponding ground switch module (14), and the second phase selection controller (13) controls the phase selection switching-on operation of the corresponding ground switch module (14), so that the process of enabling the neutral section 3 to be transited from the connection with the A-phase power supply arm to the connection with the B-phase power supply arm is completed;
when the electric locomotive (5) passes through the third position sensor (11), the second phase selection controller (13) controls the phase selection and brake separation operation of the corresponding ground switch module (14) to complete the function of disconnecting the neutral section 3 from the B-phase power supply arm, and the electric locomotive passing through the neutral section is finished;
the specific steps of the phase selection and switching-off operation are as follows:
when the position sensor senses that the electric locomotive (5) runs to a position needing to be subjected to brake opening, the position sensor sends a corresponding signal, the signal is processed by the signal conditioning part and then transmitted to the main control modules (25) of the two phase selection controllers in the phase selection control phase separation system, the main control modules (25) of the two phase selection controllers receive and immediately process the signal, and whether the phase selection controllers need to be subjected to brake opening or brake closing operation is judged, so that the phase selection controllers which correspondingly need to be subjected to brake opening operation perform brake opening action, and the phase selection controllers which do not need to be subjected to brake opening operation do not act; the phase selection controller for switching off sends a command for acquiring the line current to a line voltage and current acquisition module (22) of the phase selection controller, the current is transmitted to an AD conversion module, and a processed line current analog signal is finally converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module (25); after receiving the signal, the main control module (25) sends a switching-off instruction to drive the phase selection switch module (26) to act at the line current target phase moment after processing; the phase selection switch module (26) stops supplying current to the gate pole of the IGBT module by the driving circuit after receiving the switching-off instruction, so that the corresponding IGBT is switched off, the neutral section is disconnected with the power supply arm controlled by the phase selection controller, and the phase selection switching-off operation is finished;
the phase selection and closing operation comprises the following specific steps:
when the position sensor senses that the electric locomotive runs to a position where the phase selection switch needs to be switched on, the position sensor sends a corresponding signal; the signal is processed by the signal conditioning part and then transmitted to the main control modules (25) of the two phase selection controller parts in the phase selection control split-phase system, the main control modules (25) of the two phase selection controller parts receive and immediately process the signal and judge whether the phase selection controller needs to perform switching-off or switching-on operation, so that the phase selection controller which needs to perform switching-on operation correspondingly performs switching-on action, and the phase selection controller which does not need switching-off operation does not act; the phase selection controller for switching off sends a command for acquiring line voltage to a line voltage and current acquisition module (22) of the phase selection controller, the voltage is transmitted to an AD conversion module, and a processed line voltage analog signal is converted into a corresponding digital signal in the AD conversion module and then transmitted to a main control module (25); after receiving the signal, the main control module (25) sends a closing instruction to drive the phase selection switch module (26) to act at the target phase moment of the line voltage after processing; and after receiving a closing instruction, the phase selection switch module (26) starts a driving circuit to supply current to a gate pole of the IGBT module so as to switch on the corresponding IGBT, so that the neutral section is connected with a power supply arm controlled by the phase selection controller, and the phase selection closing operation is finished.
3. The phase selection control passing neutral section method according to claim 2, further comprising a power electronic switch redundancy backup function, specifically:
when the bidirectional switch unit fails, the detection circuit detects failure information and transmits the failure information to the main control module (25), the main control module (25) immediately sends an instruction to actuate the switch switching module (27), the failed bidirectional switch unit is short-circuited by the isolating switch (15), and the standby bidirectional switch unit is connected into the circuit, so that the switching of the standby bidirectional switch unit is completed.
4. The phase selection control passing phase separation method according to claim 2, further comprising power electronic switch idle protection energy, specifically:
when the electric locomotive passes through the neutral section, the neutral section controller sends a breaker switching-on instruction, the breaker (21) is closed before the electric locomotive passes through the neutral section, and the neutral section passing system is controlled to normally work by neutral section selection; when the electric locomotive passes through the neutral section, the phase selection controller immediately sends a breaker opening command, the idle protection module (28) acts, and the breaker (21) opens.
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| JP2005119518A (en) * | 2003-10-17 | 2005-05-12 | East Japan Railway Co | AC electric railway power supply equipment |
| KR20110116811A (en) * | 2010-04-20 | 2011-10-26 | 한국철도기술연구원 | Insulation section solid state automatic power transfer passing system and method |
| CN101837744A (en) * | 2010-06-02 | 2010-09-22 | 西南交通大学 | Novel method and device for phase separation control of ground surface over-current |
| CN203126567U (en) * | 2012-12-18 | 2013-08-14 | 西南交通大学 | Electrical split phase damping structure for electrified railway |
| CN103818271B (en) * | 2014-01-26 | 2016-05-18 | 西南交通大学 | A kind of ground surface over-current neutral section based on cascade connection multi-level |
| CN104276056A (en) * | 2014-09-23 | 2015-01-14 | 许继电气股份有限公司 | overphase system |
| CN105207232A (en) * | 2015-10-14 | 2015-12-30 | 国网江西省电力科学研究院 | Intelligent phase selection control system for 12 kV permanent magnet vacuum circuit breaker |
| CN105799553B (en) * | 2016-04-22 | 2018-03-16 | 中国船舶重工集团公司第七一二研究所 | A kind of electronic type ground automatic neutral-section passing device |
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