CN114039339A - Phase control switch design method of moving die system and related components - Google Patents
Phase control switch design method of moving die system and related components Download PDFInfo
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- CN114039339A CN114039339A CN202111314293.7A CN202111314293A CN114039339A CN 114039339 A CN114039339 A CN 114039339A CN 202111314293 A CN202111314293 A CN 202111314293A CN 114039339 A CN114039339 A CN 114039339A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
本发明公开了一种动模系统的相控开关设计方法及相关组件，该方案应用于配电网动模系统，在接收到启动信号后检测到用户设定的故障相的交流电压过零点时，再经过故障触发时间后便控制与故障相连接的双向晶闸管模块的导通，从而实现使该故障相接地。可见，由于晶闸管的导通时间较短，在控制双向晶闸管模块导通时的延迟时间便很短，此外通过实时过零点检测能够准确地控制双向晶闸管模块的导通时间，进一步提高了对双向晶闸管模块的控制精度，从而能够实现对配电网动模系统的故障模拟。
The invention discloses a phase-controlled switch design method and related components of a dynamic mode system. The solution is applied to a dynamic mode system of a distribution network, and when a user-set AC voltage zero-crossing point of a faulty phase is detected after receiving a start signal , and then after the fault triggering time, the conduction of the triac connected to the fault is controlled, so as to realize the grounding of the fault. It can be seen that due to the short turn-on time of the thyristor, the delay time when controlling the turn-on of the triac module is very short. In addition, the real-time zero-crossing point detection can accurately control the turn-on time of the triac module, which further improves the performance of the triac module. The control accuracy of the module can be realized, so that the fault simulation of the dynamic model system of the distribution network can be realized.
Description
Technical Field
The invention relates to the field of control of moving die systems, in particular to a phase control switch design method of a moving die system and related components.
Background
The neutral point grounding mode of the power distribution network in China is a small current grounding system, the probability of single-phase grounding faults in the small current grounding system is highest, and the fault characteristics are quite complex due to the fact that the fault characteristics are influenced by various factors such as system capacity flow, system unbalance, fault initial phase angles and fault transition resistance, and therefore single-phase grounding fault processing is always a technical problem of power distribution network operation. In addition, the single-phase earth fault may damage equipment insulation, or cause fire or even bring personal casualties, and the new version of power distribution network technical guideline Q/GDW10370-2016 requires that permanent single-phase earth fault occurs and is suitable for rapid and nearby fault isolation, which has a high requirement on the single-phase earth fault processing performance of a primary and secondary fusion complete equipment, so that how to ensure the correctness of the action of the equipment after being hung on the network is urgently needed to be solved.
The power distribution network dynamic simulation system adopts an equal-ratio simulation idea to simulate the operation characteristics of a power distribution network, can be flexibly connected into primary and secondary equipment to carry out single-phase earth fault processing function verification, is widely applied to various electric departments and detection units in recent years, and the single-phase earth fault characteristics of the power distribution network are closely related to factors such as a fault initial phase angle, so that the research on a high-precision phase control switch is very urgent to set the fault initial phase angle to accurately simulate the single-phase earth fault of the power distribution network.
At present, most of phase control switches used in a moving die system are realized by adopting an alternating current contactor or permanent magnet quick switch action delay, but certain discreteness exists in the switch action time of the alternating current contactor or the permanent magnet quick switch, the accurate delay time of the current alternating current contactor or the permanent magnet quick switch action cannot be determined, and the delay time has a certain relation with the voltage phase at the trigger moment, so that the accuracy of the simulation effect of realizing the single-phase fault grounding of the moving die system of the power distribution network by depending on the alternating current contactor or the permanent magnet quick switch is lower.
Disclosure of Invention
The invention aims to provide a phase control switch design method of a moving die system and related components, because the conduction time of a thyristor is short, the delay time when the bidirectional thyristor module is controlled to be conducted is short, in addition, the conduction time of the bidirectional thyristor module can be accurately controlled through real-time zero crossing point detection, the control precision of the bidirectional thyristor module is further improved, and the fault simulation of the moving die system of a power distribution network can be realized.
In order to solve the technical problem, the invention provides a phase control switch design method of a moving die system, which is applied to the moving die system of a power distribution network, wherein a bidirectional thyristor module is respectively arranged between each phase output end and a grounding end of the moving die system of the power distribution network, and the method comprises the following steps:
carrying out real-time zero crossing point detection on each alternating current voltage of the power distribution network moving die system;
determining fault trigger time based on the zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user;
judging whether a starting signal is received or not;
if so, controlling the bidirectional thyristor module connected with the fault to be conducted to enable the fault phase to be grounded when the fault triggering time passes after the alternating-current voltage zero crossing point of the fault phase is detected;
and after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off.
Preferably, before determining the fault trigger time based on the zero-crossing point detection and a fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by a user, the method further includes:
and receiving the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration setting which are sent by a user through a man-machine interaction control device.
Preferably, a circuit breaker is respectively arranged between each phase output end of the power distribution network moving die system and the bidirectional thyristor module;
the man-machine interaction control device is also used for controlling the closing of each circuit breaker before sending the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration setting; and when an overcurrent fault occurs in the power distribution network moving die system, each circuit breaker is controlled to be switched off.
Preferably, after determining the fault triggering time based on the zero crossing point detection and a fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by a user, the method further includes:
setting the timing time of a timer as the fault triggering time;
when the fault trigger time passes after the alternating-current voltage zero crossing point of the fault phase is detected, the bidirectional thyristor module connected with the fault is controlled to be conducted so as to enable the fault phase to be grounded, and the method comprises the following steps:
controlling the timer to be enabled when the alternating voltage zero-crossing point of the fault phase is detected so as to enable the timer to start timing;
and after receiving a timing time ending signal sent by the timer, controlling the bidirectional thyristor module connected with the fault to be conducted so as to enable the fault phase to be grounded.
Preferably, each phase of the power distribution network moving die system is provided with a zero-crossing detection circuit respectively, and the zero-crossing detection circuit is used for detecting a zero-crossing point of a corresponding one-phase alternating-current voltage in the power distribution network moving die system in real time and sending a zero-crossing signal when the zero-crossing point is detected;
the real-time zero crossing point detection is carried out on each alternating current voltage of the power distribution network moving die system, and the method comprises the following steps:
receiving the zero-crossing signals sent by the zero-crossing detection circuits to perform real-time zero-crossing detection on each alternating current voltage of the power distribution network moving die system;
the zero-crossing detection circuit comprises a comparator, wherein the positive input end of the comparator is grounded, the negative input end of the comparator is connected with the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system, the comparator is used for outputting a negative level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is positive, and outputting a positive level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is negative, a rising edge signal or a falling edge signal is output when the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system crosses a zero point, and the rising edge signal or the falling edge signal is the zero-crossing signal.
Preferably, after receiving the zero-crossing signal sent by each zero-crossing detection circuit to perform real-time zero-crossing detection on each ac voltage of the power distribution network moving die system, the method further includes:
judging whether the time difference between the time when the zero-crossing signal is received this time and the time when the zero-crossing signal is received last time is within a preset range or not;
and if so, determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user.
Preferably, the control end of each bidirectional thyristor module is connected with a thyristor trigger circuit respectively;
controlling the bidirectional thyristor module connected with the fault to conduct, including:
outputting a PWM zone bit enabling signal, controlling the enabling of the control end of the thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault, and outputting a PWM waveform through the control end of the thyristor trigger circuit so as to enable the thyristor trigger circuit to drive the bidirectional thyristor module connected with the fault to be conducted;
after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off, comprising:
and stopping outputting the PWM zone bit enabling signal and controlling the enabling of the control end of the thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault so as to enable the thyristor trigger circuit to drive the bidirectional thyristor module connected with the fault to be switched off.
Preferably, the power distribution network moving die system further comprises a current detection device for detecting a loop current in the power distribution network moving die system;
the method further comprises the following steps:
and if the loop current in the power distribution network moving die system is detected to be larger than the overcurrent protection current, controlling each bidirectional thyristor module to be switched off.
Preferably, the bidirectional thyristor module comprises a positive half-cycle conducting thyristor and a negative half-cycle conducting thyristor;
the first end of the positive half-cycle conducting thyristor is connected with the second end of the negative half-cycle conducting thyristor and is connected with a corresponding phase output end in the power distribution network moving die system, and the second end of the positive half-cycle conducting thyristor is connected with the first end of the negative half-cycle conducting thyristor and is connected with a ground end;
controlling the bidirectional thyristor module connected with the fault to conduct, including:
and controlling the conduction of the bidirectional thyristor module connected with the fault so as to lead the thyristor to be conducted through the positive half cycle to enable the fault phase to be grounded when the alternating voltage of the fault phase is in the positive half cycle, and lead the thyristor to be conducted through the negative half cycle to enable the fault phase to be grounded when the alternating voltage of the fault phase is in the negative half cycle.
Preferably, the determining the fault trigger time based on the zero crossing point detection and a fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by a user includes:
determining the fault trigger time based on the zero crossing point detection and a fault occurrence initial phase angle passing time calculation formula of the fault phase of the power distribution network dynamic simulation system set by a user;
the time calculation formula is as follows:
wherein T is the fault trigger time,
a primary phase angle for the fault occurrence;
the fault triggering time is the time from the detection of the zero crossing point to the control of the conduction of the bidirectional thyristor module connected with the fault.
In order to solve the technical problem, the invention provides a phase control switch design system of a moving die system, which is applied to the moving die system of a power distribution network, wherein a bidirectional thyristor module is respectively arranged between each phase output end and a grounding end of the moving die system of the power distribution network, and the phase control switch design system of the moving die system comprises:
the detection unit is used for detecting the zero crossing point of each alternating-current voltage of the power distribution network moving die system in real time;
the determining unit is used for determining fault triggering time based on the zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user;
the judging unit is used for judging whether a starting signal is received or not;
the first control unit is used for controlling the bidirectional thyristor module connected with the fault to be conducted to enable the fault phase to be grounded when the fault trigger time passes after the alternating-current voltage zero crossing point of the fault phase is detected after the starting signal is received;
and the second control unit is used for controlling the bidirectional thyristor module to be switched off after the fault duration set by a user.
In order to solve the above technical problem, the present invention provides a phase control switch design device for a moving die system, including:
a memory for storing a computer program;
and the processor is used for realizing the steps of the phase control switch design method of the moving die system when executing the computer program.
The scheme is applied to a power distribution network moving die system, and when the alternating-current voltage zero crossing point of a fault phase set by a user is detected after a starting signal is received, the conduction of a bidirectional thyristor module connected with the fault is controlled after the fault triggering time, so that the fault phase is grounded. Therefore, the conduction time of the thyristor is short, the delay time when the bidirectional thyristor module is controlled to be conducted is short, and the conduction time of the bidirectional thyristor module can be accurately controlled through real-time zero crossing point detection, so that the control precision of the bidirectional thyristor module is further improved, and the fault simulation of the power distribution network moving die system can be realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart of a phase-controlled switch design method for a moving die system according to the present invention;
fig. 2 is a schematic structural diagram of a zero-crossing detection circuit according to the present invention;
fig. 3 is a schematic structural diagram of a thyristor trigger circuit according to the present invention;
FIG. 4 is a schematic diagram of a phase-controlled switch design system for a moving die system according to the present invention;
fig. 5 is a schematic structural diagram of a phase-controlled switch design device of a moving die system according to the present invention.
Detailed Description
The core of the invention is to provide a phase control switch design method of a moving die system and related components, because the conduction time of the thyristor is short, the delay time when the bidirectional thyristor module is controlled to be conducted is very short, and in addition, the conduction time of the bidirectional thyristor module can be accurately controlled through real-time zero crossing point detection, so that the control precision of the bidirectional thyristor module is further improved, and the fault simulation of the moving die system of the power distribution network can be realized.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a phase control switch design method for a dynamic model system of a power distribution network, the method is applied to the dynamic model system of the power distribution network, a bidirectional thyristor module is respectively arranged between an output end and a ground end of each phase of the dynamic model system of the power distribution network, and the method includes:
s11: detecting the zero crossing point of each alternating current voltage of the power distribution network moving die system in real time;
in this embodiment, in consideration of the fact that in the prior art, when the single-phase ground fault simulation is performed on the power distribution network moving die system, an ac contactor or a permanent magnet fast switch is usually arranged between the output end and the ground end of the power distribution network moving die system, and the single-phase ground of the power distribution network moving die system is realized by controlling the on/off of the ac contactor or the permanent magnet fast switch connected to a certain one of the power distribution network moving die systems. However, because the ac contactor or the permanent magnet fast switch has a motion delay, the prior art cannot accurately control the ac contactor or the permanent magnet fast switch to be closed at a desired time, although the ac contactor or the permanent magnet fast switch can be closed at the desired time by setting the delay time of the ac contactor or the permanent magnet fast switch, the delay time of the ac contactor or the permanent magnet fast switch is discrete, that is, the delay time of the ac contactor or the permanent magnet fast switch is not fixed, and the delay time needs to be reset every time the delay time of the ac contactor or the permanent magnet fast switch is set, which may result in a reduction in working efficiency, and the delay time needs to be adjusted every time, and the debugging process is also complicated, which is not convenient for the user to implement fault simulation.
In order to solve the technical problem, in the application, an alternating current contactor or a permanent magnet fast switch is replaced by a bidirectional thyristor module, and the conduction time of a thyristor is short and can be almost ignored, so that even if the delay time needs to be set to control the conduction of the bidirectional thyristor at an expected time, multiple times of debugging are not needed.
In addition, in the application, each alternating current voltage of the power distribution network moving die system is subjected to real-time zero crossing point detection, so that the phase of each alternating current voltage of the power distribution network moving die system is obtained in real time, and the bidirectional thyristor module is conveniently controlled to be conducted at an expected time, namely, the bidirectional thyristor module is controlled to be conducted at a fault occurrence initial phase angle of a fault phase set by a user.
S12: determining fault trigger time based on zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user;
the zero crossing point of the fault phase set by a user can be detected through zero crossing point detection, the fault occurrence initial phase angle when the fault phase reaches the fault phase after the fault triggering time passes after the zero crossing point can be determined through the zero crossing point of the fault phase and the fault occurrence phase angle of the fault phase, namely, after the fault triggering time passes after the zero crossing point of the fault phase is detected, the bidirectional thyristor module corresponding to the fault is controlled to be conducted, and therefore the fault occurrence initial phase angle of the fault phase is grounded.
S13: judging whether a starting signal is received or not;
after the fault trigger time is calculated, whether a start signal is received is determined, where the start signal may be a start signal sent immediately by a user, or may be a timing setting performed in advance by the user through a timer, for example, the start signal sending device is caused to send the start signal at a preset timing time. If the starting signal is not received, the bidirectional thyristor module is not controlled to be conducted in the application, and zero crossing point detection is continuously carried out.
S14: if a starting signal is received, controlling the conduction of a bidirectional thyristor module connected with a fault to enable the fault phase to be grounded when fault triggering time passes after the alternating-current voltage zero crossing point of the fault phase is detected;
if a starting signal is received, the bidirectional thyristor module can be controlled to be conducted at the moment, whether a zero crossing point is detected or not is judged, if the zero crossing point is detected, timing of fault triggering time is started, and when the fault triggering time passes after the zero crossing point is detected, the bidirectional thyristor module connected with the fault is controlled to be conducted. Therefore, the fault phase is grounded at the initial phase angle of the fault phase.
S15: and after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off.
In addition, the user also sets the fault duration, that is, the grounding time of the fault phase, and starts timing after controlling the bidirectional thyristor module connected with the fault to be conducted, and if the fault duration elapses, the bidirectional thyristor module is controlled to be turned off, and the grounding of the fault phase is stopped.
It should be noted that the failure duration in the present application is not limited to a specific time, and may be satisfied with the needs of the user.
In addition, when the fault occurrence initial phase angle of the fault phase based on user setting controls the bidirectional thyristor module, the fault occurrence initial phase angle of the fault phase can be adjusted according to the actual detection result in the zero-crossing detection process so as to realize accurate control, and the method and the device are not limited to specific implementation.
Of course, the method in the present application can be widely applied to 400V, 690V, 800V and 1000V moving die systems, which is not limited in the present application. The method can also be used for constructing a power distribution network true experimental field with a 10kV voltage level or a multi-state single-phase ground fault simulation scene such as different fault phases, different fault occurrence initial phase angles and the like of a dynamic simulation system through the optimization of the high-power thyristor and the control method.
Can also set up the temperature detection module in this application, through the detection to the temperature of two-way thyristor module, avoid the thyristor high temperature to lead to the thyristor to damage, when detecting the thyristor temperature when higher, the rotational speed of steerable fan improves to the thyristor cooling.
And the fault phase is an A phase, a B phase or a C phase of the power distribution network moving die system. The initial phase angle of fault occurrence can be set in the range of 0-360 degrees, and the minimum resolution is 0.1 degrees. The minimum resolution when the fault duration is set is 1ms, and the specific time length is not limited.
In conclusion, the thyristor has short conduction time, so that the delay time when the bidirectional thyristor module is controlled to be conducted is short, and in addition, the conduction time of the bidirectional thyristor module can be accurately controlled through real-time zero crossing point detection, so that the control precision of the bidirectional thyristor module is further improved, and the fault simulation of the power distribution network moving die system can be realized.
On the basis of the above-described embodiment:
as a preferred embodiment, before determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user, the method further includes:
and receiving the fault phase setting, the fault occurrence initial phase angle setting and the fault duration setting of the power distribution network dynamic simulation system, which are sent by a user through a man-machine interaction control device.
In this embodiment, before performing zero crossing point detection, setting information of a user, such as information of fault phase setting of a power distribution network dynamic simulation system, fault occurrence initial phase angle setting of a fault phase, fault duration setting, and the like, needs to be received first, and as the above information is all sent by the user through the human-computer interaction control device, after the user performs corresponding setting on the human-computer interaction control device, the human-computer interaction control device sends the setting information to the processor in this application through the bus module, so that the processor in this application performs corresponding zero crossing point detection, fault trigger time calculation, control of the bidirectional thyristor, and the like.
In addition, the man-machine interaction control device in this application can also but not be limited to include LCD (Liquid Crystal Display) Display module for show the voltage, electric current and the running state of distribution network movable mould system, so that the user in time learns the state of distribution network movable mould system, can in time carry out the protection operation when making the user break down in distribution network movable mould system, have reliable, convenient and the high characteristic of precision.
The human-computer interaction control device may include, but is not limited to, an MCU (micro controller Unit), and the processor may also include, but is not limited to, an MCU.
When the human-computer interaction control device is connected with the processor, the connection can be performed through a bus module, but not limited to, the bus module is mainly used for data transmission and signal synchronization between the human-computer interaction control device and the processor, and the bus module comprises bus signals formed by 485 transceiving signals S _ RXD, S _ TXD, a clock synchronization signal S _ CLK, an interrupt signal S _ INT and the like, wherein the S _ RXD and the S _ TXD are data transceiving signals, and the issuing of setting parameters (for example, the setting of fault phases and related parameters) and the collection of voltage, current amplitudes and the operation state of the processor are realized; the user can start and set through a timer in the human-computer interaction control device, for example, the start signal is output to the processor at a preset time, or the start signal is sent to the processor through the human-computer interaction control device at the current time, when the signal for immediate start or the timing time of the start signal is up, the clock synchronization signal S _ CLK generates a falling edge, and the processor enters a corresponding interrupt processing function for relevant calculation and control after acquiring the falling edge signal. The interrupt processing function is to calculate the fault trigger time subsequently and perform zero-crossing detection and other processing.
In addition, the human-computer interaction control device may further include a time synchronization module to time a timer of the human-computer interaction control device based on a GPS (Global Positioning System) signal, so as to ensure accuracy of each signal in generation.
The human-computer interaction control device can further comprise a communication module, and the communication module is composed of a network port and a serial port, so that the integrated development and the remote control in the application are facilitated.
As a preferred embodiment, a circuit breaker is respectively arranged between each phase output end of the power distribution network moving die system and the bidirectional thyristor module;
the man-machine interaction control device is also used for controlling the closing of each breaker before sending the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration setting; and each circuit breaker is controlled to be switched off when an overcurrent fault occurs in the power distribution network moving die system.
The applicant considers that faults such as overcurrent and the like can exist in the power distribution network moving die system when the single-phase grounding occurs, and if the faults occur, devices in the power distribution network moving die system can be burnt out, so that the power distribution network moving die system cannot work normally.
In order to solve the technical problem, the circuit breakers arranged between each phase output end of the power distribution network dynamic simulation system and the bidirectional thyristor module are further arranged in the application, the man-machine interaction control device controls each circuit breaker to be closed before single-phase ground fault simulation, namely, before the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration time setting are sent to the processor, and therefore the fault phase of the power distribution network dynamic simulation system can be grounded, and each circuit breaker is controlled to be opened when overcurrent faults occur in the power distribution network dynamic simulation system are detected, so that the fault phase of the power distribution network dynamic simulation system is disconnected and grounded, and normal work of the power distribution network dynamic simulation system is guaranteed.
In addition, if no overcurrent fault exists in the power distribution network moving die system, the circuit breaker is synchronously controlled to be switched off when the single-phase earth fault simulation is finished, namely, the bidirectional thyristor circuit is switched off.
As a preferred embodiment, after determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user, the method further includes:
setting the timing time of the timer as the fault triggering time;
when the fault triggering time passes after the alternating voltage zero crossing point of the fault phase is detected, the bidirectional thyristor module connected with the fault is controlled to be conducted so as to enable the fault phase to be grounded, and the method comprises the following steps:
controlling a timer to enable when the alternating voltage zero crossing point of the fault phase is detected so as to enable the timer to start timing;
and after receiving a timing time ending signal sent by the timer, controlling the conduction of the bidirectional thyristor module connected with the fault so as to enable the fault phase to be grounded.
In this embodiment, when the zero crossing point of the fault phase is detected after the start signal is received, the bidirectional thyristor module connected to the fault may be controlled to be turned on only after the fault trigger time elapses. Based on this, the timer is set in the application, the timing time of the timer is the fault triggering time, when the zero crossing point of the fault phase is detected after the starting signal is received, the timer is controlled to enable, the timer starts to time, after the timing time of the undetermined timer reaches the fault triggering time, the timer sends a timing time ending signal to the processor, and at the moment, the processor controls the bidirectional thyristor connected with the fault to be conducted, so that the fault phase is grounded at the initial phase angle of the fault.
The timing time of the timer is set, so that the processor can be ensured to control the fault phase to be grounded when the processor detects the fault initial phase angle after the zero crossing point of the fault phase, the control punctuality is ensured, and the resource occupation of the processor is reduced.
As a preferred embodiment, each phase of the power distribution network moving die system is respectively provided with a zero-crossing detection circuit, which is used for detecting the zero-crossing point of the one-phase alternating-current voltage corresponding to the power distribution network moving die system in real time and sending a zero-crossing signal when the zero-crossing point is detected;
the real-time zero crossing point detection is carried out on each alternating current voltage of the power distribution network moving die system, and the method comprises the following steps:
receiving zero-crossing signals sent by each zero-crossing detection circuit to perform real-time zero-crossing detection on each alternating-current voltage of the power distribution network moving die system;
the zero-crossing detection circuit comprises a comparator, wherein the input positive end of the comparator is grounded, the input negative end of the comparator is connected with the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system, the comparator is used for outputting a negative level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is positive, and outputting a positive level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is negative, a rising edge signal or a falling edge signal is output when the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system crosses zero, and the rising edge signal or the falling edge signal is a zero-crossing signal.
In order to detect the zero crossing point of each ac voltage in the power distribution network moving mold system, the zero crossing detection circuit in this embodiment refers to fig. 2, and fig. 2 is a schematic structural diagram of the zero crossing detection circuit provided by the present invention, in which an input positive terminal of a comparator is grounded, an input negative terminal is connected to a secondary ac voltage of a phase corresponding to the comparator in the power distribution network moving mold system, when an amplitude of the secondary ac voltage of the phase corresponding to the comparator in the power distribution network moving mold system is positive, that is, when a voltage of the input positive terminal of the comparator is less than a voltage of the input negative terminal, the comparator outputs a negative level, when an amplitude of the secondary ac voltage of the phase corresponding to the comparator in the power distribution network moving mold system is negative, that is, when a voltage of the input positive terminal of the comparator is greater than a voltage of the input negative terminal, the comparator outputs a positive level, and when an input voltage of the comparator changes from a positive direction to a negative direction or changes from a negative direction, the comparator outputs a rising edge or a falling edge at the time of the zero-crossing point of the phase, so that a rising edge or a falling edge signal output by the comparator at the time of the zero-crossing point is a zero-crossing signal. The ZERO pin in fig. 2 is the output end of the ZERO-crossing detection circuit, and when a rising edge is output, the phase is 180 ° at this time, and the phase is 0 ° at a falling edge.
The comparator can be connected with the processor through a GPIO pin with a hardware interrupt function on the processor, so that the zero-crossing signal of the fault phase is sent to the processor, and the processor is judged to be the zero-crossing point of the fault phase at the moment when receiving the zero-crossing signal, and subsequent control is carried out.
Through the zero crossing point detection circuit in the embodiment, the zero crossing point detection can be realized, the problem that the input resistor is hot when the conventional optocoupler is adopted as the zero crossing point detection, and the problems of inaccuracy of zero-crossing pulses at 0-180 degrees can not be solved.
As a preferred embodiment, after receiving the zero-crossing signal sent by each zero-crossing detection circuit to perform real-time zero-crossing detection on each ac voltage of the power distribution network moving die system, the method further includes:
judging whether the time difference between the time when the zero-crossing signal is received this time and the time when the zero-crossing signal is received last time is within a preset range or not;
and if so, determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user.
The applicant considers that when harmonic exists, the zero-crossing detection circuit may be influenced by the harmonic to perform misoperation, and if the processor performs control based on the zero-crossing signal sent by the zero-crossing detection circuit during the misoperation, the fault phase is grounded in a single phase at a time when a user does not expect to perform single-phase fault simulation.
In order to solve the above technical problem, in the present application, for control based on a correct zero-crossing signal, when the zero-crossing signal is received, it is first determined whether a time difference between a time when the zero-crossing signal is received this time and a time when the zero-crossing signal is received last time is within a preset range, for example, 10ms ±. Δ t, where Δ t may be 0.5ms, and if the time difference is within the range, it may be determined that the received zero-crossing signal is valid, and control may be performed through the received zero-crossing signal this time. However, if the time difference exceeds a preset range, for example, if the time difference is too large or too small, it can be determined that the zero-crossing signal is generated due to interference or harmonic waves, and at this time, control is not performed, so that the safety problem of workers caused by the fact that error control faults are connected with each other is avoided.
As a preferred embodiment, the control end of each bidirectional thyristor module is respectively connected with a thyristor trigger circuit;
controlling the conduction of a bidirectional thyristor module connected with a fault, comprising:
outputting a Pulse Width Modulation (PWM) flag bit enabling signal, controlling the enabling of a control end of a thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault, and outputting a PWM waveform through the control end of the thyristor trigger circuit so as to enable the thyristor trigger circuit to drive the bidirectional thyristor module connected with the fault to be conducted;
after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off, comprising:
and stopping outputting the PWM zone bit enabling signal and stopping controlling the enabling of the control end of the thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault so that the thyristor trigger circuit drives the bidirectional thyristor module connected with the fault to be switched off.
In this embodiment, when the bidirectional thyristor module is controlled to be turned on, the PWM flag enable signal is output and the control end of the corresponding thyristor trigger circuit is controlled to be enabled, specifically, as shown in fig. 3, fig. 3 is a schematic structural diagram of the thyristor trigger circuit provided by the present invention, and the TRIG pin in fig. 3 is the control end of the thyristor trigger circuit. After the TRIG pin in the control chart 3 is enabled, the PWM waveform is output through the TRIG, so that the switching tube in the thyristor trigger circuit is controlled to be switched on and off, and based on the switching tube, the bidirectional thyristor module connected with the fault can be controlled to be switched on, so that the fault is grounded.
When the thyristor trigger circuit controls the conduction of the bidirectional thyristor module, the thyristor trigger circuit outputs trigger voltage of about 2.5V and trigger current of about 100mA through the output end so as to trigger the conduction of the thyristor. The circuit adopts a pulse transformer for isolation control, has strong driving capability and high voltage withstanding grade, a processor outputs PWM waveforms through TRIG, the PWM waveforms are output to a transformer through primary driving of Q18 or Q2 and secondary driving of Q8, Q13, Q1 and Q3, and the output of the transformer is rectified by a rectifier module and respectively connected to the control end of a bidirectional thyristor module.
In addition, after the fault duration time passes, the bidirectional thyristor module needs to be controlled to be disconnected so as to disconnect the grounding of the fault phase, and at the moment, the output of the PWM zone bit enabling signal is stopped, and the TRIG pin enabling is stopped to be controlled.
Based on this, through the control end output PWM waveform of thyristor trigger circuit to control the switch tube in the thyristor trigger circuit, realize having the effect easy and simple to handle, and easily adjust to the control of two-way thyristor module.
As a preferred embodiment, the power distribution network moving die system further comprises a current detection device for detecting a loop current in the power distribution network moving die system;
the method further comprises the following steps:
and if the loop current in the power distribution network moving die system is detected to be larger than the overcurrent protection current, controlling each bidirectional thyristor module to be switched off.
In order to avoid a large loop current when multiple phases of the power distribution network moving die system are short-circuited simultaneously and a fault of the bidirectional thyristor module caused by the large short-circuit current, a current detection circuit is further arranged in the embodiment, and the loop current in the power distribution network moving die system is detected through the current detection circuit so as to control each bidirectional thyristor module to be turned off when the loop current is detected to be larger than the overcurrent protection current, thereby ensuring the normal work of the bidirectional thyristor module.
As a preferred embodiment, the bidirectional thyristor module includes a positive half-cycle conducting thyristor and a negative half-cycle conducting thyristor;
the first end of the positive half-cycle conducting thyristor is connected with the second end of the negative half-cycle conducting thyristor and is connected with a corresponding one-phase output end in the power distribution network moving die system, and the second end of the positive half-cycle conducting thyristor is connected with the first end of the negative half-cycle conducting thyristor and is connected with a grounding end;
controlling the conduction of a bidirectional thyristor module connected with a fault, comprising:
and controlling the conduction of the bidirectional thyristor module connected with the fault so as to lead the fault phase to be grounded through the positive half-cycle conduction thyristor when the alternating voltage of the fault phase is in the positive half cycle, and lead the fault phase to be grounded through the negative half-cycle conduction thyristor when the alternating voltage of the fault phase is in the negative half cycle.
In this embodiment, the bidirectional thyristor module includes two thyristors, which are respectively a positive half-cycle conducting thyristor and a negative half-cycle conducting thyristor, and the output of the power distribution network moving die system is ac power, so the thyristors need to be set in both directions to ensure that no matter the ac power output by the power distribution network moving die system is in the positive half-cycle or the negative half-cycle, the fault phase can be grounded.
As a preferred embodiment, the determining the fault trigger time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user includes:
determining fault triggering time based on zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user through a time calculation formula;
the time calculation formula is as follows:
wherein T is the fault triggering time,
an initial phase angle for a fault;
and the fault triggering time is the time from the zero crossing point detection to the time for controlling the conduction of the bidirectional thyristor module connected with the fault.
In the calculation of the time-to-failure,
the unit of the initial phase angle of the fault is 0.1 degrees, the unit of the fault triggering time T is us, the frequency of the alternating current output by the power distribution network moving die system is 50Hz, and the unit of the alternating current is s, so that the method is based on the formula in the application
Is calculated. The calculation result is accurate, and control can be performed according to the setting of a user.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a phase-controlled switch design system of a dynamic simulation system, which is applied to a dynamic simulation system of a power distribution network, wherein a bidirectional thyristor module is respectively arranged between an output end and a ground end of each phase of the dynamic simulation system of the power distribution network, and the phase-controlled switch design system of the dynamic simulation system comprises:
the detection unit 41 is used for detecting the zero crossing point of each alternating-current voltage of the power distribution network moving die system in real time;
the determining unit 42 is used for determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by a user;
a judging unit 43 for judging whether a start signal is received;
the first control unit 44 is configured to, after receiving the start signal and when a fault trigger time elapses after detecting an ac voltage zero crossing point of the fault phase, control conduction of a bidirectional thyristor module connected to the fault to ground the fault phase;
and the second control unit 45 is used for controlling the bidirectional thyristor module to be turned off after the fault duration set by the user.
For the introduction of the phase-controlled switch design system of the moving die system provided by the present invention, please refer to the above method embodiment, and the present invention is not described herein again.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a phase-controlled switch design device of a moving die system according to the present invention, the device including:
a memory 51 for storing a computer program;
and a processor 52 for implementing the steps of the phase-controlled switch design method of the moving die system as described above when executing the computer program.
For the introduction of the phase-controlled switch design device of the moving die system provided by the present invention, please refer to the above method embodiment, and the present invention is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A phase control switch design method of a moving die system is characterized by being applied to the moving die system of a power distribution network, a bidirectional thyristor module is arranged between each phase output end and a grounding end of the moving die system of the power distribution network respectively, and the method comprises the following steps:
carrying out real-time zero crossing point detection on each alternating current voltage of the power distribution network moving die system;
determining fault trigger time based on the zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user;
judging whether a starting signal is received or not;
if so, controlling the bidirectional thyristor module connected with the fault to be conducted to enable the fault phase to be grounded when the fault triggering time passes after the alternating-current voltage zero crossing point of the fault phase is detected;
and after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off.
2. The method for designing a phase-controlled switch of a moving mold system according to claim 1, wherein before determining the fault triggering time based on the zero-crossing detection and a user-set fault occurrence initial phase angle of a fault phase of the moving mold system of the power distribution network, the method further comprises:
and receiving the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration setting which are sent by a user through a man-machine interaction control device.
3. The method for designing the phase-controlled switch of the moving die system according to claim 2, wherein a circuit breaker is respectively arranged between each phase output end of the moving die system of the power distribution network and the bidirectional thyristor module;
the man-machine interaction control device is also used for controlling the closing of each circuit breaker before sending the fault phase setting of the power distribution network dynamic simulation system, the fault occurrence initial phase angle setting of the fault phase and the fault duration setting; and when an overcurrent fault occurs in the power distribution network moving die system, each circuit breaker is controlled to be switched off.
4. The method for designing a phase-controlled switch of a moving mold system according to claim 1, wherein after determining the fault triggering time based on the zero crossing point detection and a user-set fault occurrence initial phase angle of the fault phase of the moving mold system of the power distribution network, the method further comprises:
setting the timing time of a timer as the fault triggering time;
when the fault trigger time passes after the alternating-current voltage zero crossing point of the fault phase is detected, the bidirectional thyristor module connected with the fault is controlled to be conducted so as to enable the fault phase to be grounded, and the method comprises the following steps:
controlling the timer to be enabled when the alternating voltage zero-crossing point of the fault phase is detected so as to enable the timer to start timing;
and after receiving a timing time ending signal sent by the timer, controlling the bidirectional thyristor module connected with the fault to be conducted so as to enable the fault phase to be grounded.
5. The phase-controlled switch design method of the moving die system of claim 1, wherein each phase of the moving die system of the power distribution network is respectively provided with a zero-crossing detection circuit, which is used for detecting the zero-crossing point of the corresponding one-phase alternating-current voltage in the moving die system of the power distribution network in real time and sending a zero-crossing signal when the zero-crossing point is detected;
the real-time zero crossing point detection is carried out on each alternating current voltage of the power distribution network moving die system, and the method comprises the following steps:
receiving the zero-crossing signals sent by the zero-crossing detection circuits to perform real-time zero-crossing detection on each alternating current voltage of the power distribution network moving die system;
the zero-crossing detection circuit comprises a comparator, wherein the positive input end of the comparator is grounded, the negative input end of the comparator is connected with the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system, the comparator is used for outputting a negative level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is positive, and outputting a positive level when the amplitude of the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system is negative, a rising edge signal or a falling edge signal is output when the secondary alternating-current voltage of one phase corresponding to the comparator in the power distribution network moving die system crosses a zero point, and the rising edge signal or the falling edge signal is the zero-crossing signal.
6. The method for designing a phase-controlled switch of a moving die system according to claim 5, wherein after receiving the zero-crossing signal sent by each zero-crossing detection circuit to perform real-time zero-crossing detection on each ac voltage of the moving die system of the power distribution network, the method further comprises:
judging whether the time difference between the time when the zero-crossing signal is received this time and the time when the zero-crossing signal is received last time is within a preset range or not;
and if so, determining the fault triggering time based on the zero crossing point detection and the fault occurrence initial phase angle of the fault phase of the power distribution network dynamic simulation system set by the user.
7. The method for designing the phase-controlled switch of the moving die system according to claim 1, wherein a thyristor trigger circuit is connected to each control end of each bidirectional thyristor module;
controlling the bidirectional thyristor module connected with the fault to conduct, including:
outputting a PWM zone bit enabling signal, controlling the enabling of the control end of the thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault, and outputting a PWM waveform through the control end of the thyristor trigger circuit so as to enable the thyristor trigger circuit to drive the bidirectional thyristor module connected with the fault to be conducted;
after the fault duration time set by a user, controlling the bidirectional thyristor module to be switched off, comprising:
and stopping outputting the PWM zone bit enabling signal and controlling the enabling of the control end of the thyristor trigger circuit corresponding to the bidirectional thyristor module connected with the fault so as to enable the thyristor trigger circuit to drive the bidirectional thyristor module connected with the fault to be switched off.
8. The phase-controlled switch design method for the moving die system of claim 1, wherein the moving die system of the power distribution network further comprises a current detection device for detecting a loop current in the moving die system of the power distribution network;
the method further comprises the following steps:
and if the loop current in the power distribution network moving die system is detected to be larger than the overcurrent protection current, controlling each bidirectional thyristor module to be switched off.
9. The method of designing a phase-controlled switch of a moving die system as claimed in claim 1, wherein the triac module includes a positive half-cycle conducting thyristor and a negative half-cycle conducting thyristor;
the first end of the positive half-cycle conducting thyristor is connected with the second end of the negative half-cycle conducting thyristor and is connected with a corresponding phase output end in the power distribution network moving die system, and the second end of the positive half-cycle conducting thyristor is connected with the first end of the negative half-cycle conducting thyristor and is connected with a ground end;
controlling the bidirectional thyristor module connected with the fault to conduct, including:
and controlling the conduction of the bidirectional thyristor module connected with the fault so as to lead the thyristor to be conducted through the positive half cycle to enable the fault phase to be grounded when the alternating voltage of the fault phase is in the positive half cycle, and lead the thyristor to be conducted through the negative half cycle to enable the fault phase to be grounded when the alternating voltage of the fault phase is in the negative half cycle.
10. The method for designing a phase-controlled switch of a moving die system according to claim 1, wherein determining the fault trigger time based on the zero-crossing detection and a user-set fault occurrence initial phase angle of the fault phase of the moving die system of the power distribution network comprises:
determining the fault trigger time based on the zero crossing point detection and a fault occurrence initial phase angle passing time calculation formula of the fault phase of the power distribution network dynamic simulation system set by a user;
the time calculation formula is as follows:
wherein T is the fault trigger time,
a primary phase angle for the fault occurrence;
the fault triggering time is the time from the detection of the zero crossing point to the control of the conduction of the bidirectional thyristor module connected with the fault.
11. The utility model provides a phase control switch design system of movable mould system which characterized in that is applied to distribution network movable mould system, be equipped with two-way thyristor module between each looks output and the earthing terminal of distribution network movable mould system respectively, the phase control switch design system of movable mould system includes:
the detection unit is used for detecting the zero crossing point of each alternating-current voltage of the power distribution network moving die system in real time;
the determining unit is used for determining fault triggering time based on the zero crossing point detection and a fault occurrence initial phase angle of a fault phase of the power distribution network dynamic simulation system set by a user;
the judging unit is used for judging whether a starting signal is received or not;
the first control unit is used for controlling the bidirectional thyristor module connected with the fault to be conducted to enable the fault phase to be grounded when the fault trigger time passes after the alternating-current voltage zero crossing point of the fault phase is detected after the starting signal is received;
and the second control unit is used for controlling the bidirectional thyristor module to be switched off after the fault duration set by a user.
12. A phase control switch design apparatus for a moving die system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for phase-controlled switch design of a moving die system according to any one of claims 1 to 10 when executing the computer program.
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