CN113078828A - Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof - Google Patents

Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof Download PDF

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Publication number
CN113078828A
CN113078828A CN202110341869.2A CN202110341869A CN113078828A CN 113078828 A CN113078828 A CN 113078828A CN 202110341869 A CN202110341869 A CN 202110341869A CN 113078828 A CN113078828 A CN 113078828A
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China
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unit
voltage
transformer
value
relay
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CN202110341869.2A
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Inventor
郭以贺
郑计平
谭明义
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Jiangsu Huawang Rongzhi Technology Co ltd
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Jiangsu Huawang Rongzhi Technology Co ltd
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Priority to CN202110341869.2A priority Critical patent/CN113078828A/en
Publication of CN113078828A publication Critical patent/CN113078828A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a bidirectional thyristor-driven power-taking power supply with voltage signal acquisition and a using method thereof, and relates to the technical field of transformer power transmission. The voltage sensor VS provided by the invention can detect the input current values on the transformer primary current sampling unit G1 and the relay KA, convert the detected current values into voltage values and output the voltage values outwards, so that the relatively complex voltage waveforms can be conveniently subjected to spectrum analysis, various protections are realized on a 10KV line system by matching with various secondary equipment such as a controller and the like, and in addition, the voltage sensor VS is connected with the ground, so that the transformer primary current sampling unit G1 and the relay KA can be simultaneously protected in the process of monitoring the transformer primary current sampling unit G1 and the relay KA.

Description

Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof
Technical Field
The invention relates to the technical field of transformer power transmission, in particular to a bidirectional thyristor-driven power-taking power supply with voltage signal acquisition and a use method thereof.
Background
The rectifier circuit is a circuit that converts ac power into dc power. The filter is a filter circuit consisting of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and the transformer is basic equipment for power transmission and distribution.
The 10KV high-voltage transmission line has the characteristics of large line current and severe load current change. The branch is many, and the line impedance changes violently. When the load current changes drastically, resonance of the power supply device is easily caused, and line resonance is formed. During resonance, the original PT power supply mode can cause over-voltage damage and even explosion of a PT (potential transformer). After the PT is damaged, the power cannot be supplied to the following controller, the controller loses power, the switch cannot be operated, the fault range may be expanded, and huge loss is brought.
Disclosure of Invention
The invention mainly aims to provide a bidirectional thyristor-driven power-taking power supply with voltage signal acquisition and a using method thereof, so that when a transformer is in short circuit, the transformer and parts on related circuits can be prevented from being damaged, and further, the voltage value can be monitored when the transformer is in alternating current short circuit.
The purpose of the invention can be achieved by adopting the following technical scheme:
a bidirectional thyristor driven power taking power supply with voltage signal acquisition comprises an alternating current bus voltage unit AC, a capacitor unit C connected with the alternating current bus voltage unit AC, and a transformer unit T connected with the capacitor unit C, wherein the transformer unit T is connected with a rectifying and filtering circuit D, and is also connected with a transformer primary current sampling unit G1 for detecting the input current value on the transformer unit T, and is also connected with a relay KA, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving the detection value of the transformer primary current sampling unit G1 and opening and closing the relay KA,
the transformer primary current sampling unit G1 is connected with a voltage sensor VS for detecting the input current value of the transformer primary current sampling unit G1 and converting the input current value into a voltage value,
be connected with bidirectional thyristor unit H1 between transformer unit T and the rectification filter circuit D, relay KA sets up between transformer unit T and bidirectional thyristor unit H1, rectification filter circuit D is connected with output voltage sampling unit H2 for detect rectification filter circuit D's output voltage value, be connected with silicon controlled rectifier drive unit H3 between output voltage sampling unit H2 and bidirectional thyristor unit H1, be used for receiving output voltage sampling unit H2's detected value, and be used for controlling bidirectional thyristor unit H1.
Preferably, a coupler OC is connected between the capacitor unit C and the transformer unit T for data transmission.
Preferably, an arrester B is connected between the capacitor unit C and the transformer unit T, and the arrester B is grounded.
Preferably, the voltage sensor VS and the relay KA are both connected to ground.
Preferably, the rectifying and filtering circuit D includes a rectifying circuit unit and a filtering circuit unit, the transformer unit T is connected to the rectifying circuit unit, and the output voltage sampling unit H2 is configured to detect an output voltage value of the filtering circuit unit.
Preferably, the triac unit H1 is connected to a circuit between the transformer unit T and the rectifier circuit unit.
The use method of the power-taking power supply driven by the bidirectional thyristor with the voltage signal acquisition comprises the following steps
Step A, detecting a voltage value output by a rectifying and filtering circuit D, and feeding back to stabilize the voltage value output by the rectifying and filtering circuit D;
and B, detecting the input current value of the transformer unit T, and feeding back to enable the input current value of the transformer unit T to be smaller than a rated value.
Preferably, step A specifically comprises the following steps
Step a1, detecting the voltage value output by the filter circuit unit by using the output voltage sampling unit H2;
step a2, the output voltage sampling unit H2 transmits the detected voltage value to the SCR driving unit H3;
step a3.1, if the voltage value detected by the output voltage sampling unit H2 is higher than the rated value, the silicon controlled drive unit H3 controls the bidirectional silicon controlled unit H1 to be conducted, and the voltage value output by the filter circuit unit is reduced, so that the voltage output by the rectifying filter circuit D returns to the rated value;
and step a3.2, if the voltage value detected by the output voltage sampling unit H2 is lower than the rated value, the silicon controlled rectifier driving unit H3 controls the bidirectional silicon controlled rectifier unit H1 to be turned off, and the voltage value output by the filter circuit unit is increased, so that the voltage output by the rectifying filter circuit D returns to the rated value.
Preferably, step B specifically comprises the following steps
B1, detecting the current value input by the transformer unit T by using the transformer primary current sampling unit G1;
step b2, the transformer primary current sampling unit G1 transmits the detected current value to the relay driving unit G2;
b3.1, if the current value detected by the transformer primary current sampling unit G1 is higher than the rated value, the relay driving unit G2 controls the relay KA to be closed, so that the current on the transformer unit T is grounded;
step b3.2, if the current value detected by the transformer primary current sampling unit G1 is lower than the rated value, the relay driving unit G2 controls the relay KA to be disconnected, so that the transformer unit T continues to normally work;
step b4, converting the voltage signal on the relay KA into the voltage signal by the voltage sensor VS in the b3.1 process for tracking and collecting, converting the current signal on the transformer primary current sampling unit G1 into the voltage signal by the voltage sensor VS in the b3.2 process for tracking and collecting
The invention has the beneficial technical effects that:
1. the output voltage sampling unit H2 provided by the invention can detect the output voltage value of the rectifying and filtering circuit D, and can regulate the circuit between the rectifying and filtering circuit D and the transformer unit T through the silicon controlled drive unit H3 and the bidirectional silicon controlled unit H1, so that the direct-current voltage after rectification and filtering is kept stable.
2. The transformer primary current sampling unit G1 provided by the invention can detect the input current value on the transformer unit T, and can ground the current on the transformer through the relay driving unit G2 and the relay KA, thereby preventing the transformer or other parts on the circuit thereof from being damaged after the AC short circuit.
3. The lightning arrester B provided by the invention can effectively protect the transformer and prevent the transformer from being damaged due to lightning breakdown.
4. The voltage sensor VS provided by the invention can detect the input current value on the transformer primary current sampling unit G1, convert the detected current value into a voltage value and output the voltage value outwards, thereby facilitating the frequency spectrum analysis of the complex voltage waveform, realizing various protections on a 10KV line system by matching with various secondary equipment such as a controller and the like, and simultaneously protecting the transformer primary current sampling unit G1 in the process of monitoring the transformer primary current sampling unit G1 by grounding the voltage sensor VS.
5. The coupler OC provided by the invention can be connected with a communication circuit, and the detection voltage value of the AC bus voltage unit can be conveniently transmitted outwards.
Drawings
FIG. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the power supply driven by triac with voltage signal acquisition provided in this embodiment includes an AC bus voltage unit AC for outputting AC power, a capacitor unit C connected to the AC bus voltage unit AC, a transformer unit T connected to the capacitor unit C for receiving and changing a voltage value of the AC power, a rectifier and filter circuit D connected to the transformer unit T, a triac unit H1 connected between the transformer unit T and the rectifier and filter circuit D, a relay KA disposed on a circuit between the transformer unit T and the triac unit H1, an output voltage sampling unit H2 connected to the rectifier and filter circuit D for detecting an output voltage value of the rectifier and filter circuit D, a triac driving unit H3 connected between the output voltage sampling unit H2 and the triac unit H1 for receiving a detection value of the output voltage sampling unit H2, and is used to control the triac unit H1,
when the output voltage sampling unit H2 detects that the output voltage value of the rectifying and filtering circuit D is unstable, the output voltage value is fed back to the SCR drive unit H3 immediately, the SCR drive unit H3 controls the bidirectional SCR unit H1 to regulate the output voltage value of the rectifying and filtering circuit D, so that the output voltage value of the rectifying and filtering circuit D tends to be stable,
the transformer primary current sampling unit G1 is connected to a voltage sensor VS, which is used for detecting an input current value of the transformer primary current sampling unit G1, converting the input current value into a voltage value, and transmitting the voltage value to the outside, wherein the voltage sensor VS is an electronic voltage sensor, and the voltage sensor is a sensor capable of sensing a measured voltage and converting the measured voltage into a usable output signal.
In this embodiment, as shown in fig. 1, a transformer primary current sampling unit G1 is further connected to the transformer unit T for detecting an input current value of the transformer unit T, a relay KA is further connected to the transformer unit T, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving a detection value of the transformer primary current sampling unit G1 and turning on and off the relay KA,
in the circuit, the relay KA is in a normally open state, when the transformer primary current sampling unit G1 detects that the current value of the AC bus voltage unit AC input transformer unit T is greater than a limit value, the feedback is given to the relay driving unit G2, the relay KA is controlled to be in a closed state through the relay driving unit G2, overlarge current is grounded, the transformer unit T is prevented from being damaged, when the transformer primary current sampling unit G1 detects that the current value of the AC bus voltage unit AC input transformer unit T is less than the limit value, the feedback is given to the relay driving unit G2, the relay KA is controlled to be in an open state through the relay driving unit G2, the transformer works normally, and the transformer short-circuit mode is divided into an AC short circuit mode and a rectified DC short circuit mode; the circuit can ensure that the transformer can still work normally, and can not generate resonance overvoltage and overcurrent, thereby avoiding fatal defects of explosion and the like of electric components used in the circuit due to the resonance overvoltage.
In this embodiment, as shown in fig. 1, a coupler OC is connected between the capacitor unit C and the transformer unit T for data transmission, and a communication circuit can be connected to implement a power line carrier communication data transmission function.
In this embodiment, as shown in fig. 1, a lightning arrester B is connected between the capacitor unit C and the transformer unit T, and the lightning arrester B is grounded, so that the safety is improved and lightning stroke is avoided.
In the present embodiment, as shown in fig. 1, both the voltage sensor VS and the relay KA are grounded, and in order to ensure the safety of the electrical components, the components are prevented from being damaged.
In this embodiment, as shown in fig. 1, the rectifying and filtering circuit D includes a rectifying circuit unit and a filtering circuit unit, the filtering circuit unit is a filter, the transformer unit T is connected to the rectifying circuit unit, the output voltage sampling unit H2 is used for detecting the output voltage value of the filtering circuit unit, and the triac unit H1 is connected to the circuit between the transformer unit T and the rectifying circuit unit, so as to further refine the action position of the output voltage sampling unit H2.
The use method of the power-taking power supply driven by the bidirectional thyristor with the voltage signal acquisition comprises the following steps
Step A, detecting a voltage value output by a rectifying and filtering circuit D, and feeding back to stabilize the voltage value output by the rectifying and filtering circuit D;
and B, detecting the input current value of the transformer unit T, and feeding back to enable the input current value of the transformer unit T to be smaller than a rated value.
In this embodiment, step a specifically includes the following steps
Step a1, detecting the voltage value output by the filter circuit unit by using the output voltage sampling unit H2;
step a2, the output voltage sampling unit H2 transmits the detected voltage value to the SCR driving unit H3;
step a3.1, if the voltage value detected by the output voltage sampling unit H2 is higher than the rated value, and the preset range is that the original voltage value detected by the output voltage sampling unit H2 is that the output voltage is increased, the bidirectional thyristor unit H1 is controlled to be conducted through the thyristor driving unit H3 to reduce the voltage value output by the filter circuit unit so that the voltage output by the rectifying filter circuit D returns to the rated value;
and a3.2, if the voltage value detected by the output voltage sampling unit H2 is lower than the rated value, and the preset range is the original voltage value detected by the output voltage sampling unit H2, namely the output voltage is reduced, controlling the bidirectional thyristor unit H1 to be turned off through the thyristor driving unit H3, and increasing the voltage value output by the filter circuit unit so that the voltage output by the rectifying filter circuit D returns to the rated value.
In this embodiment, step B specifically includes the following steps
B1, detecting the current value input by the transformer unit T by using the transformer primary current sampling unit G1;
step b2, the transformer primary current sampling unit G1 transmits the detected current value to the relay driving unit G2;
step b3.1, if the current value detected by the transformer primary current sampling unit G1 is higher than the rated value of the output voltage, namely the current value on the transformer unit T is overlarge, and the preset range is also the original current value detected by the transformer primary current sampling unit G1, the relay driving unit G2 controls the relay KA to be closed, so that the overlarge current on the transformer unit T is grounded;
step b3.2, if the current value detected by the transformer primary current sampling unit G1 is lower than the rated value of the output voltage, namely the current on the transformer unit T is normal, the relay driving unit G2 controls the relay KA to be disconnected, so that the transformer unit T continues to work normally;
step b4, in the process of b3.2, the voltage sensor VS converts the current signal on the transformer primary current sampling unit G1 into a voltage signal for tracking acquisition.
In summary, in the present embodiment, the output voltage sampling unit H2 provided in the present embodiment can detect the output voltage value of the rectifying and filtering circuit D, and can adjust the circuit between the rectifying and filtering circuit D and the transformer unit T through the thyristor driving unit H3 and the triac unit H1, so that the output voltage of the rectifying and filtering circuit D is kept stable, the transformer primary current sampling unit G1 can detect the input current value of the transformer unit T, and can ground the current on the transformer through the relay driving unit G2 and the relay KA, thereby preventing the ac short circuit of the bus or the damage to the transformer or other parts on the circuit after resonance.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.

Claims (9)

1. The utility model provides a bidirectional thyristor driven gets electric power, its characterized in that has voltage signal to gather: the device comprises an alternating current bus voltage unit AC, a capacitor unit C connected with the alternating current bus voltage unit AC, and a transformer unit T connected with the capacitor unit C, wherein the transformer unit T is connected with a rectifying and filtering circuit D, and is also connected with a transformer primary current sampling unit G1 for detecting the input current value on the transformer unit T, the transformer unit T is also connected with a relay KA, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving the detection value of the transformer primary current sampling unit G1 and opening and closing the relay KA,
the transformer primary current sampling unit G1 is connected with a voltage sensor VS for detecting the input current value of the transformer primary current sampling unit G1 and converting the input current value into a voltage value,
be connected with bidirectional thyristor unit H1 between transformer unit T and the rectification filter circuit D, relay KA sets up between transformer unit T and bidirectional thyristor unit H1, rectification filter circuit D is connected with output voltage sampling unit H2 for detect rectification filter circuit D's output voltage value, be connected with silicon controlled rectifier drive unit H3 between output voltage sampling unit H2 and bidirectional thyristor unit H1, be used for receiving output voltage sampling unit H2's detected value, and be used for controlling bidirectional thyristor unit H1.
2. The triac-driven power supply with voltage signal acquisition of claim 1, wherein: and a coupler OC is connected between the capacitor unit C and the transformer unit T and is used for data transmission.
3. The triac-driven power supply with voltage signal acquisition of claim 1, wherein: and an arrester B is connected between the capacitor unit C and the transformer unit T, and the arrester B is grounded.
4. The triac-driven power supply with voltage signal acquisition of claim 1, wherein: and the voltage sensor VS and the relay KA are both connected with the ground.
5. The triac-driven power supply with voltage signal acquisition of claim 1, wherein: the rectification filter circuit D comprises a rectification circuit unit and a filter circuit unit, the transformer unit T is connected with the rectification circuit unit, and the output voltage sampling unit H2 is used for detecting the output voltage value of the filter circuit unit.
6. The triac-driven power supply with voltage signal acquisition of claim 5, wherein: the triac unit H1 is connected to a circuit between the transformer unit T and the rectifier circuit unit.
7. The use method of the triac-driven power-taking power supply with voltage signal acquisition as claimed in any one of claims 1 to 6, wherein: comprises the following steps
Step A, detecting a voltage value output by a rectifying and filtering circuit D, and feeding back to stabilize the voltage value output by the rectifying and filtering circuit D;
and B, detecting the input current value of the transformer unit T, and feeding back to enable the input current value of the transformer unit T to be smaller than a rated value.
8. The use method of the triac-driven power-taking power supply with voltage signal acquisition as claimed in claim 7, wherein: the step A specifically comprises the following steps
Step a1, detecting the voltage value output by the filter circuit unit by using the output voltage sampling unit H2;
step a2, the output voltage sampling unit H2 transmits the detected voltage value to the SCR driving unit H3;
step a3.1, if the voltage value detected by the output voltage sampling unit H2 is higher than the rated value, the silicon controlled drive unit H3 controls the bidirectional silicon controlled unit H1 to be conducted, and the voltage value output by the filter circuit unit is reduced, so that the voltage output by the rectifying filter circuit D returns to the rated value;
and step a3.2, if the voltage value detected by the output voltage sampling unit H2 is lower than the rated value, the silicon controlled rectifier driving unit H3 controls the bidirectional silicon controlled rectifier unit H1 to be turned off, and the voltage value output by the filter circuit unit is increased, so that the voltage output by the rectifying filter circuit D returns to the rated value.
9. The use method of the triac-driven power-taking power supply with voltage signal acquisition as claimed in claim 7, wherein: the step B specifically comprises the following steps
B1, detecting the current value input by the transformer unit T by using the transformer primary current sampling unit G1;
step b2, the transformer primary current sampling unit G1 transmits the detected current value to the relay driving unit G2;
b3.1, if the current value detected by the transformer primary current sampling unit G1 is higher than the rated value, the relay driving unit G2 controls the relay KA to be closed, so that the current on the transformer unit T is grounded;
step b3.2, if the current value detected by the transformer primary current sampling unit G1 is lower than the rated value, the relay driving unit G2 controls the relay KA to be disconnected, so that the transformer unit T continues to normally work;
step b4, converting the voltage signal of the relay KA into the voltage signal by the voltage sensor VS in the b3.1 process for tracking and collecting, and converting the current signal of the transformer primary current sampling unit G1 into the voltage signal by the voltage sensor VS in the b3.2 process for tracking and collecting.
CN202110341869.2A 2021-03-30 2021-03-30 Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof Withdrawn CN113078828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110341869.2A CN113078828A (en) 2021-03-30 2021-03-30 Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110341869.2A CN113078828A (en) 2021-03-30 2021-03-30 Bidirectional silicon controlled rectifier driving transformer with voltage signal acquisition function and using method thereof

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CN113078828A true CN113078828A (en) 2021-07-06

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