CN110095712B - Switch state detection circuit, passing phase separation device, detection method and control method - Google Patents
Switch state detection circuit, passing phase separation device, detection method and control method Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a switch state detection circuit, a phase passing device, a detection method and a control method, wherein the detection circuit comprises more than two voltage detection modules, each voltage detection module is correspondingly connected to two ends of a thyristor valve group and used for detecting the voltage state of the thyristor valve group, at least one voltage detection module is configured to be used for detecting the forward voltage state of the thyristor valve group, and at least one voltage detection module is configured to be used for detecting the reverse voltage state of the thyristor valve group; each phase change switch in the phase passing device is connected with a voltage detection module; the detection method is a method for realizing the detection of the turn-off state of the commutation switch; the control method controls commutation by detecting the off state of the commutation switch. The invention has simple structure and low cost, can simultaneously detect the forward and reverse voltage states of the thyristor in the phase change switch, realizes the rapid and accurate detection of the turn-off state of the phase change switch, and reduces the phase change time.
Description
Technical Field
The invention relates to the technical field of traction power supply of electrified railways, in particular to a switching state detection circuit, a phase passing device, a detection method and a control method.
Background
Due to the particularity of the traction power supply mode and the train operation mode of the railway system, a neutral isolation area, namely an 'electric phase splitting' area or a 'neutral area', which is about 200-900 m and is used for separating different electric phases exists every 30-60 km, and the mode that an electric traction train or a motor train unit passes through the neutral isolation area is 'over-split'. In order to prevent the contact network damage accident caused by arc discharge due to manual misoperation of a driver and live break-through phase, the method mainly comprises two modes of vehicle-mounted power-off automatic passing-through phase and ground automatic passing-through phase at present, wherein the vehicle-mounted passing-through phase scheme has the advantages that the running time cannot be compressed to the maximum extent due to obvious train power loss, the maintenance workload of a high-speed train is large, the maintenance outage time is long, and the running requirement of the high-speed railway cannot be met; the ground automatic passing neutral section mode is that a ground automatic passing neutral section device is used, when a train passes the neutral section, a ground switch bridged between a neutral section and a power supply arm is controlled to switch to supply power to the neutral section, the neutral section has short power-free time, the train has no speed loss, the running time can be shortened, and the maintenance workload of the high-speed train and the like are reduced.
At present, when a ground automatic passing neutral section device is used for controlling passing neutral sections, at least 2-8 s of time is needed for a train to run at a high speed of 350km/h, the continuous power supply interruption time of an electric traction train is more than or equal to 0.3s, the electric traction train judges that power supply is interrupted and is not electrified, the internal power load is automatically cut off, the train enters a power-off self-protection state, the train enters a powerless coasting state at the moment, the running speed of the train and the comfort of passengers are influenced by the passing neutral sections, and in order to reduce the influence, the ground automatic passing neutral section device is required to realize phase change as quickly as possible.
The traditional ground automatic neutral section passing device is shown in figure 1 and comprises two phase-change switches of a thyristor SCR _ V1 and an SCR _ V2, wherein the running position of a train is detected by sensors CG 1-CG 4, when the load of the train enters the position of the sensor CG1, a switch SCR _ V1 is switched on, when the load of the train enters the position of the sensor CG2, a switch SCR _ V1 is switched off, and then a switch SCR _ V2 is switched on rapidly to ensure the non-inductive reversing of the train; after the train reaches the position of the sensor CG4, the electronic switch SCR _ V2 is closed, and the phase change process is finished; when the train runs in the reverse direction, the switch switches SCR _ V2 and SCR _ V1 are controlled to be turned on and off in sequence, and the principle is the same as the principle. In the process of passing through the neutral section, when two phase change switches are controlled to be switched, the former switch is usually switched off, and the latter switch is switched on after a certain time delay, as described above, when the switch SCR _ V1 is switched off, the switch SCR _ V2 is switched off again after a time delay, but if the former switch is not switched off completely, the other switch is switched on at the moment, so that short-circuit current is generated.
In order to avoid the generation of short-circuit current, the latter switch is turned on only after the former switch is completely turned off, so that the power-off time of the turn-off and turn-on intervals between the two switches is better as long as possible theoretically, so as to ensure that the former switch is completely turned off when the latter switch is turned on, and the train operation is influenced by the overlong power-off time. Therefore, it is desirable to provide a method for detecting a commutation switch state, so as to achieve accurate and fast detection of the switch off state, avoid generation of an impulse current, and reduce commutation time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a switching state detection circuit and a detection method, which can simultaneously detect the forward and reverse voltage states of a thyristor in a commutation switch, thereby realizing the rapid and accurate detection of the turn-off state of the thyristor, avoiding the generation of transient shock, simultaneously reducing the commutation time in the passing phase process, and providing a passing phase device and a control method which have short commutation time and can avoid the transient shock.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the phase change switch state detection circuit for passing through split phase control comprises more than two thyristor valve groups which are connected in sequence, the detection circuit comprises more than two voltage detection modules, each voltage detection module is correspondingly connected to two ends of each thyristor valve group and used for detecting the voltage state of each corresponding thyristor valve group, at least one voltage detection module is configured to be used for detecting the forward voltage state of each corresponding thyristor valve group, and at least one voltage detection module is configured to be used for detecting the reverse voltage state of each corresponding thyristor valve group.
As a further improvement of the circuit of the invention: the voltage detection module comprises a voltage acquisition unit, a comparison unit and a pulse generation unit which are sequentially connected, wherein the input end of the voltage acquisition unit is connected with the thyristor valve group to be detected, the voltage acquisition unit acquires a voltage signal of the thyristor valve group to be detected and outputs the voltage signal to the comparison unit, and the comparison unit triggers the pulse generation unit to generate a pulse signal to output after comparing the received voltage signal with a reference voltage.
As a further improvement of the circuit of the invention: the voltage acquisition unit comprises a first resistor, a second resistor and a voltage stabilizing diode, the second resistor is connected with the voltage stabilizing diode in series and then connected with the first resistor in parallel, the cathode of the voltage stabilizing diode is connected with the thyristor valve group to be detected through the second resistor, the anode of the voltage stabilizing diode is grounded, and one input end of the comparison unit is connected between the voltage stabilizing diode and the second resistor.
As a further improvement of the circuit of the invention: the pulse generating unit is specifically a timing circuit, and when the comparing unit outputs the effective voltage signal, the timing circuit generates a pulse signal with a specified width to output.
As a further improvement of the circuit of the invention: the device also comprises an optical fiber transmitting unit connected with the pulse generating unit, and when the pulse generating unit outputs a pulse signal, the optical fiber transmitting unit is driven to generate an optical signal and send the optical signal to a control system for passing neutral phase control.
As a further improvement of the circuit of the invention: the connection directions of the first voltage detection module used for detecting the forward voltage signal state of the thyristor valve group and the second voltage detection module used for detecting the reverse voltage signal state of the thyristor valve group are opposite.
As a further improvement of the circuit of the invention: the commutation switch specifically comprises 2N thyristor valve groups which are sequentially connected in series, the detection circuit comprises 2N voltage detection modules, each voltage detection module is correspondingly connected with one thyristor valve group, the first N thyristor valve groups are configured as the first voltage detection module, and the last N thyristor valve groups are configured as the second voltage detection module.
As a further improvement of the circuit of the invention: the detection circuit further comprises a current detection module for detecting the current state of the commutation switch.
As a further improvement of the circuit of the invention: the current detection module comprises a current detection unit and a zero crossing point extraction unit which are sequentially connected, wherein the current detection unit detects a current signal of the commutation switch, outputs the current signal to the zero crossing point extraction unit, extracts a zero crossing signal through the zero crossing point extraction unit, and outputs the zero crossing signal to a control system for passing split-phase control.
As a further improvement of the circuit of the invention: the zero crossing point extraction unit comprises a current conversion subunit and a comparison subunit which are sequentially connected, the current conversion subunit receives the current signal detected by the current detection unit, converts the current signal into a current signal with a required size and outputs the current signal to the comparison subunit, and the comparison subunit extracts the zero crossing point of the signal to obtain a current zero crossing signal and outputs the current zero crossing signal.
The automatic ground passing neutral section device is characterized in that each phase change switch is also connected with the detection circuit, the detection circuit is connected with the control system, and the control system receives a state signal detected by the detection circuit and controls the on-off of the two phase change switches.
A state detection method using the state detection circuit, comprising the steps of:
s1, acquiring voltage state signals detected by each voltage detection module in the target commutation switch;
and S2, judging the turn-off state of the target commutation switch according to the voltage state signals detected by the voltage detection modules.
As a further improvement of the detection method of the invention: the step S2 further includes detecting a current signal of the phase change switch, and determining an off state of the target phase change switch by integrating the voltage state signal and the current signal detected by each voltage detection module.
As a further improvement of the detection method of the invention: and when the target phase change switch is judged to be in an off state according to the voltage state signal and the current zero-crossing signal extracted from the current signal is at the current zero-crossing point, judging that the target phase change switch is in the off state.
A control method for automatically passing through neutral section of ground features that two phase-change switches bridged between two power supply arms and neutral section are controlled by control system to realize passing through neutral section of train, when the phase-change switch at one side is turned off and the phase-change switch at another side is turned on, the off state of the phase-change switch at current side is detected by said state detection method, and when it is judged that the phase-change switch at another side is turned off, the phase-change switch at another side is turned on.
Compared with the prior art, the invention has the advantages that:
1) the voltage state of the thyristor valve group is detected by configuring the voltage detection module for the thyristor valve group in the commutation switch, the turn-off state of the whole commutation switch can be obtained according to the voltage state of the thyristor, meanwhile, the forward voltage is detected by configuring a part of the voltage detection modules, the reverse voltage is detected by a part of the voltage detection modules, the forward and reverse voltage states of the thyristor valve group can be detected simultaneously, and therefore the fast and accurate detection of the turn-off state of the commutation switch can be realized according to the voltage state of the thyristor valve group.
2) When the voltage detection modules for detecting reverse voltages are more than two respectively, the stability and reliability of detection can be further improved, when one voltage detection module fails, the detection can be realized by other normal voltage detection modules 1, and the redundancy reliability of the circuit is high.
3) The voltage detection module is further composed of the voltage acquisition unit, the comparison unit and the pulse generation unit, when the two ends of the thyristor valve group have voltages, pulse signals are generated and output, the voltage state of the thyristor valve group can be rapidly judged and obtained through the pulse signals, the cost is low, the detection efficiency is high, the efficiency of detecting the switch state can be further improved, the voltage state detection is realized based on a hardware circuit structure, and compared with a traditional voltage sensor and the like, the voltage detection module is low in cost and high in detection precision.
4) According to the method, on the basis of detecting the voltage state and judging the turn-off state of the phase change switch, the current state of the phase change switch is further detected, the turn-off state of the phase change switch is judged by combining the voltage state and the current state, the accurate judgment of the specific turn-off time of the phase change switch can be realized, the precision and the reliability of the turn-off judgment of the switch are improved as much as possible, and the turn-off of the automatic passing neutral section device is judged quickly, accurately and reliably, so that the phase change time in the passing neutral section process is reduced, and a train can pass through a neutral section without inductance.
Drawings
FIG. 1 is a schematic diagram of the structure principle of a conventional ground automatic neutral section passing device.
Fig. 2 is a schematic structural diagram of a phase change switch state detection circuit for excessive phase control in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of the wiring principle of each voltage detection module in embodiment 1 of the present invention.
Fig. 4 is a schematic circuit structure diagram of the voltage detection module in embodiment 1 of the present invention.
Fig. 5 is a schematic circuit structure diagram of the current detection module in embodiment 1 of the present invention.
FIG. 6 is a schematic structural diagram of a ground passing phase separation device in embodiment 1 of the present invention.
Fig. 7 is a schematic diagram of a structural principle of a commutation switch state detection circuit to implement detection in embodiment 2 of the present invention.
Illustration of the drawings: 1. a voltage detection module; 11. a voltage acquisition unit; 12. a comparison unit; 13. a pulse generating unit; 14. an optical fiber launch unit.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
As shown in fig. 2, the phase change switch state detection circuit for passing neutral section control in this embodiment includes more than two thyristor valve groups connected in sequence, each thyristor valve group includes two thyristors connected in anti-parallel, the detection circuit includes more than two voltage detection modules 1, each voltage detection module 1 is correspondingly connected to two ends of one thyristor valve group, and is used for detecting a voltage state of the corresponding thyristor valve group, wherein at least one voltage detection module 1 is configured to be used for detecting a forward voltage state of the corresponding thyristor valve group, and at least one voltage detection module 1 is configured to be used for detecting a reverse voltage state of the corresponding thyristor valve group.
When the phase change switch is formed by connecting more than two thyristor valve groups, if the phase change switch is turned off, each thyristor valve group is in a turn-off state, and the voltage state of each thyristor valve group can be changed at the moment when the phase change switch is turned off. This embodiment detects the voltage status of thyristor valves through configuring voltage detection module 1 for thyristor valves in the commutation switch, can be fast by the voltage status of thyristor, the accurate shutoff state that obtains whole commutation switch, configure partial voltage detection module simultaneously and detect forward voltage, and partial voltage detection module detects reverse voltage, can realize the detection of the two-way shutoff voltage of thyristor valves, thereby can realize by the voltage status of thyristor valves that commutation switch shutoff state is quick, accurate detection and then reduce commutation time, can avoid short-circuit current's production simultaneously.
When the number of the thyristor valve groups is multiple, the corresponding detection circuits are provided with a plurality of voltage detection modules 1, the voltage detection modules 1 configured to detect forward voltages and the voltage detection modules 1 configured to detect reverse voltages are respectively more than two, the stability and reliability of detection can be further improved, when one voltage detection module 1 fails, detection can be realized by other normal voltage detection modules 1, and the redundancy and reliability of the circuit are high.
As shown in fig. 3, in the voltage detection module 1 (VD) of this embodiment, the connection directions of the first voltage detection module for detecting the forward voltage signal state of the thyristor valve group and the second voltage detection module for detecting the reverse voltage signal state of the thyristor valve group are opposite, wherein the thyristor signal input terminal S1 of the first voltage detection module is connected to the incoming line terminal of the thyristor valve group, and the thyristor signal input terminal S1 of the second voltage detection module is connected to the outgoing line terminal of the thyristor valve group, so as to respectively identify the detection of the forward voltage signal state and the reverse voltage signal state.
In this embodiment, the voltage detection module 1 specifically includes a voltage acquisition unit 11, a comparison unit 12 and a pulse generation unit 13 that are connected in sequence, the input end of the voltage acquisition unit 11 is connected with the thyristor valve group to be detected, the voltage acquisition unit 11 acquires the voltage signal of the thyristor valve group to be detected and outputs the voltage signal to the comparison unit 12, and after the comparison unit 12 compares the received voltage signal with the reference voltage, the pulse generation unit 13 is triggered to generate a pulse signal for output. Through the structure, when the two ends of the thyristor valve group are provided with voltage, pulse signals are generated and output, the voltage state of the thyristor valve group can be quickly judged by the pulse signals, the cost is low, the detection efficiency is high, and the efficiency of detecting the on-off state can be further improved.
In the embodiment, the device further comprises an optical fiber transmitting unit 14 connected with the pulse generating unit 13, and when the pulse generating unit 3 outputs a pulse signal, the optical fiber transmitting unit 14 is driven to generate an optical signal and transmit the optical signal to a control system for the excess phase control; in the passing phase separation control process, after a target commutation switch is switched on, each voltage detection module 1 does not emit light, when the target commutation switch is switched off, each voltage detection module 1 emits light, a control system judges the light emitting state of each voltage detection module 1, and if a specified number of voltage detection modules 1 emit light, namely the level of a specified thyristor valve group is turned over, the commutation switch is judged to be in the switched-off state.
As shown in fig. 4, the voltage collecting unit 11 of this embodiment specifically includes a first resistor R300, a second resistor R301, and a zener diode V301, where the second resistor R301 is connected in series with the zener diode V301 and then connected in parallel with the first resistor R300, a cathode of the zener diode V301 is connected to the thyristor valve group to be detected through the second resistor R301 via an S1 end, an anode of the zener diode V301 is grounded, the comparing unit 12 specifically uses a comparator N2, and one input end of the comparing unit 12 is connected between the zener diode V301 and the second resistor R301 to generate a fixed reference voltage; the pulse generating unit 13 specifically uses the timing circuit a300A, when the comparing unit 12 outputs the effective voltage signal, the timing circuit a300A generates a pulse signal output with a specified width, and the optical fiber transmitting unit 4 specifically uses the optical fiber transmitter TX 1. Adopt above-mentioned hardware circuit structure to realize voltage status detection, compare in traditional voltage sensor etc. and realize with low costs and detect the precision height.
When the incoming line end and the outgoing line end bear forward voltage, the thyristor valve group bears the forward voltage, the first voltage detection module is started to detect the voltage state of the thyristor valve group, as shown in fig. 2, the first voltage detection module is connected into the forward voltage of the thyristor valve group through a signal end S1, positive voltage borne by a voltage stabilizing diode V301 is compared with reference voltage Vref, when the voltage stabilizing value of the voltage stabilizing diode V301 is greater than the reference voltage Vref, a comparator N2 outputs level inversion from low to high, a timer A300 outputs pulse with fixed width, an optical fiber transmitter is driven to emit light through a resistor R307 and a triode V186, an optical signal is sent to a control system, and the state detection that the thyristor bears the positive voltage, namely the turn-off state detection of the thyristor is realized and is fed back to the control system; when the incoming line end and the outgoing line end bear reverse voltage and the thyristor valve group bears the reverse voltage, the second voltage detection module is started to detect the voltage state of the thyristor valve group, the detection principle is the same as that of the first voltage detection module, the state detection that the thyristor bears the reverse voltage is realized, and the state detection is fed back to the control system.
For the second voltage detection module for detecting the reverse voltage signal state of the thyristor valve bank, when the incoming line end and the outgoing line end of the thyristor valve bank bear reverse voltage, the turn-off detection plates VDn + 1-VD 2n corresponding to Tn + 1-T2 n feed back the turn-off state of the thyristor.
In this embodiment, the detection circuit further includes a current detection module for detecting a current signal state of the commutation switch. When the electronic switch of the thyristor finishes turn-off, the corresponding current signal is a current zero crossing point, and the turn-off state of the commutation switch can be further determined by combining the current state through detecting the current state of the commutation switch, so that the detection precision and reliability are improved.
In this embodiment, the current detection module includes a current detection unit and a zero crossing point extraction unit 21 that are connected in sequence, the current detection unit detects a current signal of the commutation switch, outputs the current signal to the zero crossing point extraction unit 21, extracts a zero crossing signal through the zero point extraction unit 21, and outputs the zero crossing signal to the control system for passing neutral-section control, and the control system determines the turn-off time of the commutation switch based on the zero crossing signal.
In this embodiment, the zero crossing point extracting unit 21 includes a current converting subunit and a comparing subunit connected in sequence, where the current converting subunit receives the current signal detected by the current detecting unit, converts the current signal into a current signal of a required magnitude, and outputs the current signal to the comparing subunit, and the comparing subunit extracts a zero crossing point of the signal to obtain a current zero crossing signal and outputs the current zero crossing signal; the control system synthesizes the current zero-crossing signal and the voltage state signals detected by the voltage detection modules 1, and finally determines the accurate turn-off time of the phase change switch, so that the conduction of the other phase change switch can be accurately controlled.
In this embodiment, a current transformer TA is specifically provided at an input side of each phase change switch to detect a current of the phase change switch; the zero-crossing point extracting unit 21 is specifically as shown IN fig. 5, the current converting subunit realizes current signal conversion by using a transformer T4, an input end (IP, IN) of the transformer T4 is connected to a current transformer TA, an output end of the transformer T4 is provided with an active filter formed by R34, C64 and U11A for filtering, the filter is connected to the comparing subunit by an amplifier U11C, the comparing subunit specifically uses a comparator formed by R53-R55 and U5, and an output end of the comparator outputs an extracted zero-crossing point. When the current transformer TA works, a current signal acquired by the current transformer TA is converted into a milliampere-level current signal through the transformer T4, the milliampere-level current signal is sequentially filtered by an active filter and amplified by an amplifier and then output to a comparator U5, and the zero-crossing point of the current signal is extracted after the comparison by the comparator U5 to obtain a current zero-crossing signal; and sending the obtained current zero-crossing signal to a control system, wherein the first current zero-crossing point is the moment when the thyristor valve is turned off after the trigger pulse of the thyristor is stopped.
The present embodiment further utilizes the state detection method of the state detection circuit, and the steps include:
s1, acquiring voltage state signals detected by each voltage detection module 1 in the target commutation switch;
and S2, judging the turn-off state of the target commutation switch according to the voltage state signals detected by the voltage detection modules.
By the method, the voltage state of the thyristor valve group can be detected, the turn-off state of the whole phase change switch can be quickly and accurately obtained according to the voltage state of the thyristor, and meanwhile, the detection of the bidirectional turn-off voltage of the thyristor valve group can be realized, so that the quick and accurate detection of the turn-off state of the phase change switch can be realized according to the voltage state of the thyristor valve group, the phase change time is further reduced, and the generation of impulse current can be avoided.
In this embodiment, step S2 further includes detecting a current zero-crossing signal of the phase change switch, and determining an off state of the target phase change switch by integrating the voltage state signal and the current zero-crossing signal detected by each voltage detection module. On the basis of judging the turn-off state of the phase change switch by detecting the voltage state, the current state of the phase change switch is further detected, the turn-off state of the phase change switch is jointly judged by synthesizing the voltage state and the current state, the accurate judgment of the specific turn-off time of the phase change switch can be realized, the precision and the reliability of the turn-off judgment of the switch are improved as much as possible, and the turn-off of the automatic passing neutral section device is quickly, accurately and reliably judged, so that the phase change time in the passing neutral section process is reduced, and a train can pass through a neutral section without inductance.
In this embodiment, when it is determined that the target commutation switch is in the off state according to the voltage state signal and the current zero-crossing signal is at the current zero-crossing point, it is determined that the target commutation switch is in the off state, so that the specific time of turning off the thyristor is accurately determined in combination with the current zero-crossing signal, and specifically, after the trigger pulse of the thyristor stops, the first current zero-crossing point is the time of turning off the thyristor valve.
As shown in fig. 6, the present embodiment further includes a ground automatic neutral section passing device, which includes a control system and two phase change switches V1 and V2 bridged between the two power supply arms and the neutral section, where the phase change switches V1 and V2 have the same structure, the control system is respectively connected to the two phase change switches V1 and V2, each phase change switch (V1 and V2) includes two or more thyristor valve sets connected in sequence, the control system controls the switching of the two phase change switches to achieve train neutral section passing, each phase change switch is further connected to the above detection circuit, the detection circuit is connected to the control system, and the control system receives a state signal detected by the detection circuit to control the on/off of the two phase change switches.
In this embodiment, a static voltage-sharing resistor is further arranged at the input side of each thyristor valve group and used for realizing voltage sharing; and two ends of each thyristor valve group are also connected with a dynamic RC absorption circuit in parallel for inhibiting the overlarge voltage rise rate, and the dynamic RC absorption circuit comprises an absorption resistor R and an absorption capacitor C.
The embodiment further comprises a ground automatic neutral section passing control method, wherein the control system controls two phase change switches V1 and V2 bridged between the two power supply arms and the neutral section to realize train neutral section passing, when the phase change switch on one side is turned off and the phase change switch on the other side needs to be turned on, the state detection method is used for detecting the turn-off state of the phase change switch on the current side, and when the phase change switch on the other side is judged to be in the turn-off state, the control method is used for controlling the phase change switch on the other side to be turned on. In the passing neutral section process, the state detection method is used for rapidly, accurately and reliably judging the turn-off of the automatic passing neutral section device when the phase change is switched, so that the phase change time can be shortened, the passing neutral section performance is improved, and a train can pass through a neutral section without feeling.
Example 2:
the present embodiment is substantially the same as embodiment 1, except that each phase change switch in the present embodiment specifically includes 2N (N is an integer, and N > 1) thyristor valve blocks connected in series in sequence, the detection circuit includes 2N voltage detection modules 1, namely, each thyristor valve group is correspondingly provided with one voltage detection module 1, as shown in fig. 7, each voltage detection module 1 is correspondingly connected with one thyristor valve group, wherein, the voltage detection modules 1 (T1-Tn) corresponding to the first N thyristor valve groups are configured as first voltage detection modules, the voltage detection modules 1 (Tn + 1-T2N) corresponding to the last N thyristor valve groups are configured as second voltage detection modules, the directions of the incoming and outgoing lines of the T1-Tn thyristors are opposite to the directions of the incoming and outgoing lines of the Tn + 1-T2N thyristor levels, when the inlet wire end and the outlet wire end bear forward voltage, the voltage detection modules VD 1-VDn corresponding to T1-Tn feed back the turn-off state of the thyristor; when the incoming line end and the outgoing line end bear reverse voltage, the voltage detection modules VDn + 1-VD 2n corresponding to Tn + 1-T2 n feed back the turn-off state of the thyristor.
When the detection circuit works, the control system receives the detection results of the voltage detection modules 1 respectively, integrates the detection results of the voltage detection modules 1 to judge the turn-off state of the commutation switch, and further can accurately determine the turn-off time of the commutation switch by combining the current detection modules.
This embodiment is through all setting up a voltage detection module 1 for every thyristor valves in the commutation switch respectively, by wherein preceding N voltage detection module 1 corresponds and detects forward voltage state, and back N voltage detection module 1 corresponds and detects reverse voltage state, can realize the two-way voltage state of thyristor valves and detect, and whole detection circuitry's redundancy reliability is high simultaneously, still can normally work when one of them or a plurality of voltage detection module 1 breaks down, guarantees the precision of testing result.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (15)
1. The utility model provides a commutation switch state detection circuitry for passing through split phase control, the commutation switch includes the thyristor valves group that connects gradually more than two, its characterized in that: the detection circuit comprises more than two voltage detection modules (1), each voltage detection module (1) is correspondingly connected to two ends of one thyristor valve group and used for detecting the voltage state of the corresponding thyristor valve group, wherein at least one voltage detection module (1) is configured to be used for detecting the forward voltage state of the corresponding thyristor valve group, and at least one voltage detection module (1) is configured to be used for detecting the reverse voltage state of the corresponding thyristor valve group; the thyristor signal input end of the first voltage detection module for detecting the forward voltage state of the thyristor valve group is connected with the wire inlet end of the corresponding thyristor valve group, and the thyristor signal input end of the second voltage detection module for detecting the reverse voltage state of the thyristor valve group is connected with the wire outlet end of the corresponding thyristor valve group.
2. The commutation switch state detection circuit for over-phase control according to claim 1, wherein: the voltage detection module (1) comprises a voltage acquisition unit (11), a comparison unit (12) and a pulse generation unit (13) which are sequentially connected, wherein the input end of the voltage acquisition unit (11) is connected with the thyristor valve group to be detected, the voltage acquisition unit (11) acquires a voltage signal of the thyristor valve group to be detected and outputs the voltage signal to the comparison unit (12), and the comparison unit (12) triggers the pulse generation unit (13) to generate pulse signal output after comparing the received voltage signal with reference voltage.
3. The commutation switch state detection circuit for over-phase control according to claim 2, wherein: the voltage acquisition unit (1) comprises a first resistor, a second resistor and a voltage stabilizing diode, the second resistor is connected with the voltage stabilizing diode in series and then connected with the first resistor in parallel, the cathode of the voltage stabilizing diode is connected with a thyristor valve group to be detected through the second resistor, the anode of the voltage stabilizing diode is grounded, and one input end of the comparison unit (12) is connected between the voltage stabilizing diode and the second resistor.
4. The commutation switch state detection circuit for over-phase control according to claim 2, wherein: the pulse generating unit (13) is specifically a timing circuit, and when the comparison unit (12) outputs an effective voltage signal, the timing circuit generates a pulse signal with a specified width for output.
5. The commutation switch state detection circuit for the over-phase control according to claim 2, 3 or 4, further comprising an optical fiber transmitting unit (14) connected to the pulse generating unit (13), wherein when the pulse generating unit (13) outputs a pulse signal, the optical fiber transmitting unit (14) is driven to generate an optical signal and transmit the optical signal to a control system for the over-phase control.
6. The commutation switch state detection circuit for excess phase control according to any one of claims 1 to 4, wherein: the connection directions of the first voltage detection module used for detecting the forward voltage signal state of the thyristor valve group and the second voltage detection module used for detecting the reverse voltage signal state of the thyristor valve group are opposite.
7. The commutation switch state detection circuit for over-phase control according to claim 6, wherein: the commutation switch specifically comprises 2N thyristor valve groups which are sequentially connected in series, the detection circuit comprises 2N voltage detection modules (1), each voltage detection module (1) is correspondingly connected with one thyristor valve group, the first N thyristor valve groups are configured as the first voltage detection module, and the last N thyristor valve groups are configured as the second voltage detection module.
8. The commutation switch state detection circuit for excess phase control according to any one of claims 1 to 4, wherein: the detection circuit further comprises a current detection module for detecting the current state of the commutation switch.
9. The commutation switch state detection circuit for over-phase control according to claim 8, wherein: the current detection module comprises a current detection unit and a zero crossing point extraction unit (21) which are sequentially connected, wherein the current detection unit detects a current signal of the phase change switch, outputs the current signal to the zero crossing point extraction unit (21), extracts a zero crossing signal through the zero crossing point extraction unit (21), and outputs the zero crossing signal to a control system for passing neutral section control.
10. The commutation switch state detection circuit for over-phase control according to claim 9, wherein: the zero crossing point extraction unit (21) comprises a current conversion subunit and a comparison subunit which are connected in sequence, the current conversion subunit receives the current signal detected by the current detection unit, converts the current signal into a current signal with a required size and outputs the current signal to the comparison subunit, and the comparison subunit extracts the zero crossing point of the signal to obtain a current zero crossing signal and outputs the current zero crossing signal.
11. An automatic ground passing neutral section device comprises a control system and two phase change switches bridged between two power supply arms and a neutral section, wherein the control system is respectively connected with the two phase change switches, each phase change switch comprises more than two thyristor valve groups which are sequentially connected, and the control system controls the switching of the two phase change switches to realize the passing neutral section of a train.
12. A commutation switch state detection method using the detection circuit according to any one of claims 1 to 10, comprising the steps of:
s1, acquiring voltage state signals detected by each voltage detection module in the target commutation switch;
and S2, judging the turn-off state of the target commutation switch according to the voltage state signals detected by the voltage detection modules.
13. The commutation switch state detection method of claim 12, wherein: the step S2 further includes detecting a current signal of the phase change switch, and determining an off state of the target phase change switch by integrating the voltage state signal and the current signal detected by each voltage detection module.
14. The commutation switch state detection method of claim 13, wherein when it is determined that the target commutation switch is in an off state according to the voltage state signal and a current zero-crossing signal extracted from the current signal is at a current zero-crossing point, it is determined that the target commutation switch is in the off state.
15. A control method for automatically passing through neutral section of ground features that when the phase-change switch at one side is turned off and the phase-change switch at another side is turned on, the state of the phase-change switch at current side is detected by the state detection method of phase-change switch as claimed in claim 12, 13 or 14, and when it is judged that the phase-change switch at another side is turned off, the phase-change switch at another side is turned on.
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| CN114184922B (en) * | 2020-08-25 | 2024-05-03 | 中车株洲电力机车研究所有限公司 | Diode device state detection system and method |
| CN114103737B (en) * | 2020-09-01 | 2024-11-05 | 株洲中车时代电气股份有限公司 | A train power supply system and a train automatic phase-shifting control device |
| CN113466678B (en) * | 2021-03-17 | 2024-02-13 | 中国人民解放军海军工程大学 | High-current multiphase change-over switch fault rapid detection device |
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