CN112803411A - Signal sending circuit for station area topology identification and identification method - Google Patents
Signal sending circuit for station area topology identification and identification method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a signal sending circuit and a signal identifying method for district topology identification, and belongs to the technical field of district topology equipment. The invention discloses a signal sending circuit for identifying a platform area topology, which comprises a signal isolation accelerating module, a characteristic signal switching module and a high-voltage starting module; the signal isolation acceleration module is used for outputting the PWM driving signal to the characteristic signal switching module; the characteristic signal switching module is used for converting the accelerated signals into characteristic current signals and sending the characteristic current signals to the power network; and the high-voltage starting module is used for converting the high-voltage direct-current drive into the low-voltage direct-current drive and providing the low-voltage direct-current drive to the signal isolation acceleration module. Through continuous exploration and tests, the signal transmission circuit with the signal isolation acceleration module, the characteristic signal switching module and the high-voltage starting module is arranged, so that the characteristic current signal for topology identification can be accurately generated, the accurate identification of the platform area topology is further realized, the scheme is detailed, the method is feasible, the method is convenient to realize, and the manufacturing cost is low.
Description
Technical Field
The invention relates to a signal sending circuit and a signal identifying method for district topology identification, and belongs to the technical field of district topology equipment.
Background
Chinese patent (CN 110988476A) discloses a device and a method for identifying a phase topology of a distribution room, wherein the topology identification device is composed of a zero-crossing detection circuit, a single chip, a topology current generator, a current transformer, a topology current detection circuit, and the like. The identification method comprises the steps of firstly detecting the zero crossing point of the voltage of a power grid of a platform area, sending a zero crossing signal to a singlechip of an identification device, sending topology current to the power grid of the platform area by an emission module of the identification device, sampling the topology current in the power grid of the platform area by a current transformer of a receiving node, sending the topology current to a topology current detection circuit of the node and the singlechip, sampling the received topology signal by the singlechip at a time close to the zero crossing point, and finally obtaining a phase topology relation graph of the power grid of the whole platform area according to the phase relation of each node and the relation of an upper. The invention identifies the topological phase of the transformer area by detecting the zero crossing point of the voltage of the power grid, eliminates the influence of the load current in the power grid on the phase identification to the greatest extent and improves the identification rate.
However, the above scheme does not disclose a specific structure of the topology current generator, which results in that the current signal for identifying the platform area topology cannot be accurately generated, thereby affecting the accurate identification of the platform area topology.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a signal sending circuit and a recognition method for identifying the topology of a transformer area, which can accurately generate a characteristic current signal for identifying the topology, thereby realizing the accurate recognition of the topology of the transformer area.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a signal sending circuit for platform area topology identification comprises a signal isolation acceleration module, a characteristic signal switching module and a high-voltage starting module;
the signal isolation acceleration module is used for outputting the PWM driving signal to the characteristic signal switching module and is provided with a DC blocking capacitor, an MOS (metal oxide semiconductor) tube and a totem pole module;
the blocking capacitor is used for coupling the PWM driving signal and acting the PWM wave obtained after coupling on the grid electrode of the MOS tube;
the MOS tube is continuously switched on and off along with the high-low conversion of the PWM wave, so that an optical coupler on a source electrode generates a signal which tends to be the same as an input signal, and the signal is transmitted to the totem-pole module;
the totem-pole module is used for accelerating a signal output by the secondary side of the optical coupler;
the characteristic signal switching module is used for converting the received accelerated signals into characteristic current signals and sending the characteristic current signals to a power network, and forming a high-voltage direct-current driving high-voltage starting module; it is provided with a switching MOS tube;
the switching MOS tube switches a fixed load onto a power line network according to the change rule of the grid voltage to generate a characteristic current signal for topology identification;
and the high-voltage starting module is used for converting the high-voltage direct-current drive into the low-voltage direct-current drive and providing the low-voltage direct-current drive to the signal isolation acceleration module.
Through continuous exploration and tests, the signal transmission circuit with the signal isolation acceleration module, the characteristic signal switching module and the high-voltage starting module is arranged, so that the characteristic current signal for topology identification can be accurately generated, the accurate identification of the platform area topology is further realized, the scheme is detailed, the method is feasible, the method is convenient to realize, and the manufacturing cost is low.
As a preferable technical measure:
the signal isolation acceleration module further comprises a triode VT2, a triode VT3, a triode VT4, a diode VD6, a diode VD7, a diode VD8, a resistor R16, a resistor R17, a resistor R20, a resistor R21 and a resistor R22;
the triode VT2 is used for realizing the rapid on-off of a circuit, and the grid electrode of the triode VT2 is coupled with the blocking capacitor C2;
the resistor R16 is used for giving a low-level initial state to the grid of the MOS tube so as to ensure that the MOS tube is not conducted by mistake;
the resistor R17 is used for limiting current and ensuring the driving capability of the optical coupler;
the diode VD6 is used for limiting the negative level to-0.2V so as to prevent the damage to the module caused by the overhigh negative voltage;
the diode VD8 and the resistor R20 are used for increasing a charge bleeding speed adding bleeding loop;
the resistor R22 is used for providing a low-level initial state for the grid of the MOS tube to ensure that misconduction cannot occur;
the diode VD7 is used for clamping the grid voltage and avoiding the damage of the triode VT2 due to high-voltage breakdown.
As a preferable technical measure:
when PWM waves are input, the direct current component is removed by the direct current blocking capacitor C2, a driving logic for high and low level switching is left, and the MOS tube switches the on-off state according to the logic to enable the optocoupler 01 to switch in the on-off state;
when the PWM stops outputting, the charge on the blocking capacitor C2 is discharged through the resistor R6 and returns to the initial state;
when the optocoupler is switched on, the triode VT3 is switched on, the triode VT4 is switched off, the level of the point A is high, and the triode VT2 is switched on after passing through the resistor R21, so that a load is switched to a power network to generate current;
when the optocoupler is switched off, the triode VT4 is switched on, the triode VT3 is switched off, and charges on the parasitic capacitor Cgs of the triode VT2 are discharged through the resistor R21, the resistor R20, the diode VD8 and the triode VT4, so that the voltage drop speed of a point B is accelerated, the triode VT2 can be switched off quickly, a load is removed from a power network, and no current is generated.
As a preferable technical measure:
the characteristic signal switching module is directly connected with a strong power circuit and comprises a diode VD2, a diode VD3, a diode VD4, a diode VD5, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RV1 and a resistor RV 2;
the diode VD2, the diode VD3, the diode VD4 and the diode VD5 are used for carrying out full-bridge rectification on current;
the resistor RV1 and the resistor RV2 are pressure-sensitive components and are used for overvoltage protection;
the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are used as load resistors, and determine the strength of the characteristic current signal.
As a preferable technical measure:
after full-bridge rectification of the diode VD2, the diode VD3, the diode VD4 and the diode VD5, a half-wave type high-voltage direct current is formed at a voltage stabilizing front voltage input end VIN network after passing through the resistor R12, the resistor R13, the resistor R14 and the resistor R15.
As a preferable technical measure:
the high-voltage starting module comprises a diode VD1, a triode VT1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C3;
high-voltage direct current of a voltage input end VIN before voltage stabilization is divided by resistors of a diode VD1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 to provide a fixed voltage for a grid electrode of a triode VT1, after the voltage meets the opening voltage of a triode VT1 of an MOS tube, the MOS tube is conducted, a voltage input end VIN network before voltage stabilization charges a capacitor C3 on a power supply voltage VCC network of the circuit through a circuit of the resistor R5, the resistor R6, a resistor R7, the resistor R8 and the resistor R9, and the power supply voltage VCC of a low-voltage direct current circuit is obtained.
As a preferable technical measure:
a signal transmission identification method for district topology identification applies the signal transmission circuit for district topology identification; the characteristic signal switching module transmits the characteristic current signal to a receiving terminal at the upper stage through a power network, and the receiving terminal identifies the characteristic current signal and then confirms the subordination relation between the transmitting terminal and the receiving terminal to which the characteristic signal switching module belongs; and determining the topological relation of the whole station area through the subordination relation of each hierarchy.
As a preferable technical measure:
the generation of the characteristic current signal comprises the following steps:
the switching frequency of the characteristic signal switching module is F, the switch in each switching period is on for TM microsecond, and is off for TM microsecond, and the duty ratio is 1/2; in order to accurately extract switching signal energy, a signal code element is coded, TM millisecond is used as a code bit, TM millisecond is periodically switched on and off to represent code bit 1, and TM millisecond is continuously switched off to represent code bit 0.
As a preferable technical measure:
the characteristic signal switching module generates a corresponding characteristic current signal and sends the characteristic current signal according to the issuing time calibration; the receiving end samples and identifies the current signal in real time and stores identification records; and combing the topological structure according to the stored identification record and by combining a table searching mechanism to obtain the topological relation of the whole station area.
As a preferable technical measure:
the specific content of real-time sampling identification is as follows:
the receiving end collects current signals in real time at f sampling frequency, extracts signal intensity at a certain frequency point by utilizing sliding Fourier transform, matches a decoding code element with a sending code element after sliding decoding is carried out, and stores an identification record if matching is successful;
frequency point
The signal strength calculation formula is as follows:
wherein the content of the first and second substances,
respectively representing frequency points
The real, imaginary and module values of the harmonic,
for the purpose of the current phase position,
the number of points used for one slip period,
which represents the starting sample point and is,
the serial numbers of the sampling points are shown,
which represents the time interval between the sampling of the samples,
are current samples.
Compared with the prior art, the invention has the following beneficial effects:
through continuous exploration and tests, the signal transmission circuit with the signal isolation acceleration module, the characteristic signal switching module and the high-voltage starting module is arranged, so that the characteristic current signal for topology identification can be accurately generated, the accurate identification of the platform area topology is further realized, the scheme is detailed, the method is feasible, the method is convenient to realize, and the manufacturing cost is low.
Drawings
FIG. 1 is a block diagram of the structure of modules of the present invention.
Fig. 2 is a schematic circuit diagram of the characteristic signal switching module of the present invention.
Fig. 3 is a circuit schematic diagram of the high voltage start-up module of the present invention.
Fig. 4 is a schematic circuit diagram of the signal isolation acceleration module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
As shown in fig. 1 to 4, a signal transmission circuit for identifying a distribution room topology includes a signal isolation acceleration module, a characteristic signal switching module, and a high voltage start module.
The signal isolation acceleration module is used for outputting the PWM driving signal to the characteristic signal switching module and is provided with a blocking capacitor, an MOS (metal oxide semiconductor) tube and a totem-pole module.
And the blocking capacitor is used for coupling the PWM driving signal and applying the PWM wave obtained after coupling to the grid electrode of the MOS tube.
The MOS tube is continuously switched on and off along with the high-low conversion of the PWM wave, so that the optical coupler on the source electrode generates a signal which tends to be the same as an input signal, and the signal is transmitted to the totem-pole module.
And the totem-pole module is used for accelerating the signal output by the secondary side of the optical coupler.
And the characteristic signal switching module is used for converting the received accelerated signals into characteristic current signals and sending the characteristic current signals to a power network, and forming a high-voltage direct-current driving high-voltage starting module. It is provided with switching MOS tube.
And the switching MOS tube switches a fixed load onto a power line network according to the change rule of the grid voltage to generate a characteristic current signal for topology identification.
And the high-voltage starting module is used for converting the high-voltage direct-current drive into the low-voltage direct-current drive and providing the low-voltage direct-current drive to the signal isolation acceleration module.
Through continuous exploration and tests, the signal transmission circuit with the signal isolation acceleration module, the characteristic signal switching module and the high-voltage starting module is arranged, so that the characteristic current signal for topology identification can be accurately generated, the accurate identification of the platform area topology is further realized, the scheme is detailed, the method is feasible, the method is convenient to realize, and the manufacturing cost is low.
The invention discloses a specific embodiment of a signal isolation acceleration module, which comprises the following steps:
the signal isolation acceleration module further comprises a triode VT2, a triode VT3, a triode VT4, a diode VD6, a diode VD7, a diode VD8, a resistor R16, a resistor R17, a resistor R20, a resistor R21 and a resistor R22;
the triode VT2 is used for realizing the rapid on-off of a circuit, and the grid electrode of the triode VT2 is coupled with the blocking capacitor C2;
the resistor R16 is used for giving a low-level initial state to the grid of the MOS tube so as to ensure that the MOS tube is not conducted by mistake;
the resistor R17 is used for limiting current and ensuring the driving capability of the optical coupler;
the diode VD6 is used for limiting the negative level to-0.2V so as to prevent the damage to the module caused by the overhigh negative voltage;
the diode VD8 and the resistor R20 are used for increasing a charge bleeding speed adding bleeding loop;
the resistor R22 is used for providing a low-level initial state for the grid of the MOS tube to ensure that misconduction cannot occur;
the diode VD7 is used for clamping the grid voltage and avoiding the damage of the triode VT2 due to high-voltage breakdown.
When PWM waves are input, the direct current component is removed by the direct current blocking capacitor C2, a driving logic for high and low level switching is left, and the MOS tube switches the on-off state according to the logic to enable the optocoupler 01 to switch in the on-off state;
when the PWM stops outputting, the charge on the blocking capacitor C2 is discharged through the resistor R6 and returns to the initial state;
when the optocoupler is switched on, the triode VT3 is switched on, the triode VT4 is switched off, the level of the point A is high, and the triode VT2 is switched on after passing through the resistor R21, so that a load is switched to a power network to generate current;
when the optocoupler is switched off, the triode VT4 is switched on, the triode VT3 is switched off, and charges on the parasitic capacitor Cgs of the triode VT2 are discharged through the resistor R21, the resistor R20, the diode VD8 and the triode VT4, so that the voltage drop speed of a point B is accelerated, the triode VT2 can be switched off quickly, a load is removed from a power network, and no current is generated.
The invention relates to a specific embodiment of a characteristic signal switching module, which comprises the following steps:
the characteristic signal switching module is directly connected with a strong power circuit and comprises a diode VD2, a diode VD3, a diode VD4, a diode VD5, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RV1 and a resistor RV 2;
the diode VD2, the diode VD3, the diode VD4 and the diode VD5 are used for carrying out full-bridge rectification on current;
the resistor RV1 and the resistor RV2 are pressure-sensitive components and are used for overvoltage protection;
the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are used as load resistors, and determine the strength of the characteristic current signal.
After full-bridge rectification of the diode VD2, the diode VD3, the diode VD4 and the diode VD5, a half-wave type high-voltage direct current is formed at a voltage stabilizing front voltage input end VIN network after passing through the resistor R12, the resistor R13, the resistor R14 and the resistor R15.
The invention discloses a specific embodiment of a high-voltage starting module, which comprises the following steps:
the high-voltage starting module comprises a diode VD1, a triode VT1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C3;
high-voltage direct current of a voltage input end VIN before voltage stabilization is divided by resistors of a diode VD1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 to provide a fixed voltage for a grid electrode of a triode VT1, after the voltage meets the opening voltage of a triode VT1 of an MOS tube, the MOS tube is conducted, a voltage input end VIN network before voltage stabilization charges a capacitor C3 on a power supply voltage VCC network of the circuit through a circuit of the resistor R5, the resistor R6, a resistor R7, the resistor R8 and the resistor R9, and the power supply voltage VCC of a low-voltage direct current circuit is obtained.
The invention discloses a specific embodiment of a characteristic current signal sending and identifying method, which comprises the following steps:
a signal transmission identification method for district topology identification applies the signal transmission circuit for district topology identification; the characteristic signal switching module transmits the characteristic current signal to a receiving terminal at the upper stage through a power network, and the receiving terminal identifies the characteristic current signal and then confirms the subordination relation between the transmitting terminal and the receiving terminal to which the characteristic signal switching module belongs; and then the topological relation of the whole station area can be determined through the subordination relation of each hierarchy.
The generation of the characteristic current signal comprises the following steps:
the switching frequency of the characteristic signal switching module is F, the switch in each switching period is on for TM microsecond, and is off for TM microsecond, and the duty ratio is 1/2; in order to accurately extract switching signal energy, a signal code element is coded, TM millisecond is used as a code bit, TM millisecond is periodically switched on and off to represent code bit 1, and TM millisecond is continuously switched off to represent code bit 0.
The characteristic signal switching module generates a corresponding characteristic current signal and sends the characteristic current signal according to the issuing time calibration; the receiving end samples and identifies the current signal in real time and stores identification records; and combing the topological structure according to the stored identification record and by combining a table searching mechanism to obtain the topological relation of the whole station area.
The specific content of real-time sampling identification is as follows:
the receiving end collects current signals in real time at f sampling frequency, extracts signal intensity at a certain frequency point by utilizing sliding Fourier transform, matches a decoding code element with a sending code element after sliding decoding is carried out, and stores an identification record if matching is successful;
frequency point
The signal strength calculation formula is as follows:
wherein the content of the first and second substances,
respectively representing frequency points
The real, imaginary and module values of the harmonic,
for the purpose of the current phase position,
the number of points used for one slip period,
which represents the starting sample point and is,
the serial numbers of the sampling points are shown,
which represents the time interval between the sampling of the samples,
are current samples.
The invention relates to a best embodiment and a working principle:
as shown in fig. 1, the PWM driving signal passes through the signal isolation acceleration module and then is output to the characteristic signal switching module, and the switching module converts the received logic signal into a characteristic current signal and sends the characteristic current signal to the power network; the characteristic signal switching module forms a high-voltage direct-current driving high-voltage starting module, and the high-voltage starting module converts high-voltage direct-current driving into low-voltage direct-current driving to be provided for the signal isolation accelerating module.
As shown in fig. 2, the characteristic signal switching module is directly connected to a strong power line, and forms a half-wave high-voltage direct current at a voltage input end VIN network before voltage stabilization after full-bridge rectification through a diode VD2, a diode VD3, a diode VD4 and a diode VD5, and through a resistor R12, a resistor R13, a resistor R14 and a resistor R15; two voltage-sensitive resistors RV1 and RV2 are used as overvoltage protection; the resistor R12, the resistor R13, the resistor R14, and the resistor R15 determine the intensity of the characteristic current signal as a load resistor.
As shown in fig. 3, the high voltage starting module divides the high voltage dc at the voltage input terminal VIN before voltage regulation by the clamp of the diode VD1 and the resistors R1-R4 to provide a fixed voltage to the gate of the transistor VT1, after the voltage meets the turn-on voltage of the transistor VT1, the MOS transistor is turned on, and the network of the voltage input terminal VIN before voltage regulation charges the capacitor C3 on the power supply voltage VCC network of the circuit through the lines of the resistor R5-the resistor R9, so as to obtain the power supply voltage VCC of the low voltage dc circuit.
As shown in the signal isolation acceleration module of fig. 4, the driving signal is coupled to the gate of the transistor VT2 through the blocking capacitor C2, and the resistor R16 provides the gate of the MOS transistor with a low-level initial state, so as to ensure that the MOS transistor is not turned on by mistake.
When PWM waves are input, a direct current component is removed by a blocking capacitor C2, a driving logic for high and low level switching is left, an MOS (metal oxide semiconductor) tube can be switched on and off according to the logic to enable an optocoupler 01 to be switched on and off, a resistor R17 has a current limiting effect to ensure the driving capability of the optocoupler, and when PWM stops outputting, charges on the blocking capacitor C2 are discharged through the resistor R6 and return to an initial state; the diode VD6 functions to limit the negative level to-0.2V to prevent damage to the module from excessive negative voltage.
When the optocoupler is switched on, the triode VT3 is switched on, the triode VT4 is switched off, the level of the point A is high, and the triode VT2 is switched on after passing through the resistor R21, so that a load is switched to a power network to generate current; when the optocoupler is switched off, the triode VT4 is switched on, the triode VT3 is switched off, and charges on a parasitic capacitor Cgs of the MOS transistor VT2 are discharged through the resistor R21, the resistor R20, the diode VD8 and the triode VT4, so that the voltage drop speed of a point B is accelerated, the triode VT2 can be switched off quickly, a load is removed from a power network, and no current is generated; the diode VD8 and the resistor R20 are added to increase the charge discharging speed, the resistor R22 provides a low-level initial state for the grid electrode of the MOS tube to ensure that the MOS tube is not conducted by mistake, and the diode VD7 is used for clamping the grid electrode voltage to avoid high-voltage breakdown to damage the triode VT 2.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A signaling circuit for identification of a topology of a cell,
the device comprises a signal isolation acceleration module, a characteristic signal switching module and a high-voltage starting module;
the signal isolation acceleration module is used for outputting the PWM driving signal to the characteristic signal switching module and is provided with a DC blocking capacitor, an MOS (metal oxide semiconductor) tube and a totem pole module;
the blocking capacitor is used for coupling the PWM driving signal and acting the PWM wave obtained after coupling on the grid electrode of the MOS tube;
the MOS tube is continuously switched on and off along with the high-low conversion of the PWM wave, so that an optical coupler on a source electrode generates a signal which tends to be the same as an input signal, and the signal is transmitted to the totem-pole module;
the totem-pole module is used for accelerating a signal output by the secondary side of the optical coupler;
the characteristic signal switching module is used for converting the received accelerated signals into characteristic current signals and sending the characteristic current signals to a power network, and forming a high-voltage direct-current driving high-voltage starting module; it is provided with a switching MOS tube;
the switching MOS tube switches a fixed load onto a power line network according to the change rule of the grid voltage to generate a characteristic current signal for topology identification;
and the high-voltage starting module is used for converting the high-voltage direct-current drive into the low-voltage direct-current drive and providing the low-voltage direct-current drive to the signal isolation acceleration module.
2. The signaling circuit for topology identification of a cell as recited in claim 1,
the signal isolation acceleration module further comprises a triode VT2, a triode VT3, a triode VT4, a diode VD6, a diode VD7, a diode VD8, a resistor R16, a resistor R17, a resistor R20, a resistor R21 and a resistor R22;
the triode VT2 is used for realizing the rapid on-off of a circuit, and the grid electrode of the triode VT2 is coupled with the blocking capacitor C2;
the resistor R16 is used for giving a low-level initial state to the grid of the MOS tube so as to ensure that the MOS tube is not conducted by mistake;
the resistor R17 is used for limiting current and ensuring the driving capability of the optical coupler;
the diode VD6 is used for limiting the negative level to-0.2V so as to prevent the damage to the module caused by the overhigh negative voltage;
the diode VD8 and the resistor R20 are used for increasing a charge bleeding speed adding bleeding loop;
the resistor R22 is used for providing a low-level initial state for the grid of the MOS tube to ensure that misconduction cannot occur;
the diode VD7 is used for clamping the gate voltage.
3. The signaling circuit for topology identification of a cell according to claim 2,
when PWM waves are input, the direct current component is removed by the direct current blocking capacitor C2, a driving logic for high and low level switching is left, and the MOS tube switches the on-off state according to the logic to enable the optocoupler 01 to switch in the on-off state;
when the PWM stops outputting, the charge on the blocking capacitor C2 is discharged through the resistor R6 and returns to the initial state;
when the optocoupler is switched on, the triode VT3 is switched on, the triode VT4 is switched off, the level of the point A is high, and the triode VT2 is switched on after passing through the resistor R21, so that a load is switched to a power network to generate current;
when the optocoupler is switched off, the triode VT4 is switched on, the triode VT3 is switched off, and charges on the parasitic capacitor Cgs of the triode VT2 are discharged through the resistor R21, the resistor R20, the diode VD8 and the triode VT4, so that the voltage drop speed is accelerated, the triode VT2 can be switched off quickly, the load is removed from a power network, and the current is not generated any more.
4. The signaling circuit for topology identification of a cell as recited in claim 1,
the characteristic signal switching module is directly connected with a strong power circuit and comprises a diode VD2, a diode VD3, a diode VD4, a diode VD5, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor RV1 and a resistor RV 2;
the diode VD2, the diode VD3, the diode VD4 and the diode VD5 are used for carrying out full-bridge rectification on current;
the resistor RV1 and the resistor RV2 are pressure-sensitive components and are used for overvoltage protection;
the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are used as load resistors, and determine the strength of the characteristic current signal.
5. The signaling circuit for topology identification of a cell according to claim 4,
after full-bridge rectification of the diode VD2, the diode VD3, the diode VD4 and the diode VD5, a half-wave type high-voltage direct current is formed at a voltage stabilizing front voltage input end VIN network after passing through the resistor R12, the resistor R13, the resistor R14 and the resistor R15.
6. The signaling circuit for topology identification of a cell as recited in claim 1,
the high-voltage starting module comprises a diode VD1, a triode VT1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C3;
high-voltage direct current of a voltage input end VIN before voltage stabilization is divided by resistors of a diode VD1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 to provide a fixed voltage for a grid electrode of a triode VT1, after the voltage meets the opening voltage of a triode VT1 of an MOS tube, the MOS tube is conducted, a voltage input end VIN network before voltage stabilization charges a capacitor C3 on a power supply voltage VCC network of the circuit through a circuit of the resistor R5, the resistor R6, a resistor R7, the resistor R8 and the resistor R9, and the power supply voltage VCC of a low-voltage direct current circuit is obtained.
7. A signaling identification method for identifying a topology of a cell,
applying a signalling circuit for identification of a cell topology according to any of claims 1-6;
the characteristic signal switching module transmits the characteristic current signal to a receiving terminal at the upper stage through a power network, and the receiving terminal identifies the characteristic current signal and then confirms the subordination relation between the transmitting terminal and the receiving terminal to which the characteristic signal switching module belongs; and determining the topological relation of the whole station area through the subordination relation of each hierarchy.
8. A signaling identification method for topology identification of a cell according to claim 7,
the generation of the characteristic current signal comprises the following steps:
the switching frequency of the characteristic signal switching module is F, the switch in each switching period is on for TM microsecond, and is off for TM microsecond, and the duty ratio is 1/2; in order to accurately extract switching signal energy, a signal code element is coded, TM millisecond is used as a code bit, TM millisecond is periodically switched on and off to represent code bit 1, and TM millisecond is continuously switched off to represent code bit 0.
9. The signaling identification method for topology identification of a cell according to claim 8,
the characteristic signal switching module generates a corresponding characteristic current signal and sends the characteristic current signal according to the issuing time calibration; the receiving end samples and identifies the current signal in real time and stores identification records; and combing the topological structure according to the stored identification record and by combining a table searching mechanism to obtain the topological relation of the whole station area.
10. The signaling identification method for topology identification of a cell according to claim 9,
the specific content of real-time sampling identification is as follows:
the receiving end collects current signals in real time at f sampling frequency, extracts signal intensity at a certain frequency point by utilizing sliding Fourier transform, matches a decoding code element with a sending code element after sliding decoding is carried out, and stores an identification record if matching is successful;
frequency point
The signal strength calculation formula is as follows:
wherein the content of the first and second substances,
respectively representing frequency points
The real, imaginary and module values of the harmonic,
for the purpose of the current phase position,
the number of points used for one slip period,
which represents the starting sample point and is,
the serial numbers of the sampling points are shown,
which represents the time interval between the sampling of the samples,
are current samples.
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