CN110729772A - Intelligent power supply and power supply control method for electronic current transformer - Google Patents
Intelligent power supply and power supply control method for electronic current transformer Download PDFInfo
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- CN110729772A CN110729772A CN201911141922.3A CN201911141922A CN110729772A CN 110729772 A CN110729772 A CN 110729772A CN 201911141922 A CN201911141922 A CN 201911141922A CN 110729772 A CN110729772 A CN 110729772A
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- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- 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
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Abstract
An intelligent power supply and power supply control method of an electronic current transformer belongs to the technical field of power supplies and is characterized by comprising a measuring coil and an energy taking coil which are connected with a microprocessor, and the method further comprises the following steps of a, electrifying initialization, b, judging a real-time current value, c ~ e, executing step k if the real-time current value is larger than an upper limit value and executing step i if the real-time current value is smaller than a lower limit value, otherwise calculating a PWM parameter, f, judging a real-time voltage value, g ~ h, executing step k if the real-time voltage value is larger than the upper limit value and executing step k if the real-time current value is smaller than the lower limit value, executing step i if the real-time current value is smaller than the lower limit value, otherwise executing step j, outputting a low level signal by the microprocessor, outputting the PWM parameter by the microprocessor and outputting a high level signal by the microprocessor.
Description
Technical Field
An intelligent power supply and a power supply control method for an electronic current transformer belong to the technical field of power supplies.
Background
Along with the rapid development of electric power automation, more and more electric power system on-line monitoring equipment are provided, and a required power supply of the traditional electric power monitoring equipment is usually taken from a power frequency transformer or a voltage transformer and belongs to a voltage power supply. With the continuous improvement of the state of the art, more and more on-line monitoring devices do not need high-power supplies (such as power frequency transformers, voltage transformers, and the like), and meanwhile, a plurality of towers are not equipped with high-power supplies any more, so that the current power supply mode is applied more and more, and particularly, in the aspect of distributed on-line monitoring, the current power supply mode has incomparable superiority. Although many on-line monitoring devices adopt solar power supply, solar power supply also has inherent defects of weather condition limitation, high energy storage requirement and the like, and can not completely meet the power supply requirement of the on-line monitoring devices, so that electricity taking through current magnetic induction is a convenient and effective power supply mode at present.
An electromagnetic current power taking system generally needs to rectify secondary current output of an energy taking current transformer to obtain direct current voltage, and then perform DC/DC conversion on the direct current voltage to obtain required direct current stabilized power supplies with different voltage amplitudes. Generally, the load power required to be provided by a voltage-stabilized power supply is limited, the load power is as large as several watts and as small as dozens of milliwatts, the input current range of a common mutual inductor is very wide, the input current range is as small as several amperes and as large as hundreds of amperes, and the current can even reach dozens of kiloamperes during a fault, so that the current-powered power supply can safely, stably and reliably run for a long time under the condition of wide-range and large-current input, wherein the design of a large-current protection circuit is indispensable.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the intelligent power-taking power supply and the power-taking control method of the electronic current transformer overcome the defects of the prior art, and the intelligent power-taking power supply and the power-taking control method of the electronic current transformer enable the current energy-taking power supply to operate safely, stably and reliably for a long time under the conditions of wide range and large current input by respectively detecting alternating current signals and direct current signals obtained by the measuring coil and the energy-taking coil through the microprocessor and controlling the alternating current signals and the direct current signals through the direct current protection circuit.
The technical scheme adopted by the invention for solving the technical problems is as follows: this electronic type current transformer intelligence is got electric power, its characterized in that: the device is provided with a measuring coil and an energy-taking coil, wherein the primary sides of the measuring coil and the energy-taking coil are connected to an alternating current transmission line, the secondary side of the measuring coil is connected with a current signal conversion circuit for converting a current signal output by the measuring coil into a voltage signal, and the output end of the current signal conversion circuit is connected with the input end of a microprocessor;
the secondary side of the energy-taking coil is connected with a rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with a voltage conversion circuit; a direct current protection circuit is arranged between the rectification filter circuit and the voltage conversion circuit, a switch device is arranged in the direct current protection circuit, a control signal output end of the microprocessor is connected with the direct current protection circuit to control the on-off of the switch device, and the output end of the rectification filter circuit is simultaneously connected with an input end of the microprocessor.
Preferably, an alternating voltage conditioning circuit is further arranged at the output end of the current signal conversion circuit, the output end of the current signal conversion circuit is connected with the input end of the alternating voltage conditioning circuit, and the output end of the alternating voltage conditioning circuit is connected with the input end of the microprocessor.
Preferably, the output end of the rectification filter circuit is further provided with a direct-current voltage conditioning circuit, the output end of the rectification filter circuit is connected with the input end of the direct-current voltage conditioning circuit, and the output end of the direct-current voltage conditioning circuit is connected with the input end of the microprocessor.
Preferably, an alternating current protection circuit is further arranged between the energy taking coil secondary side and the rectification filter circuit.
Preferably, the alternating current protection circuit comprises a thyristor W2, a resistor R1 ~ R4 and a voltage regulator tube T1 ~ T2, the secondary side of the energy-taking coil is respectively connected with the anode of the voltage regulator tube T1 and one end of the resistor R4, the other end of the resistor R4 is simultaneously connected with the other end of the resistor R3 and the control end of the thyristor W2, the other end of the resistor R3 is connected with the anode of the voltage regulator tube T2, and the cathode of the voltage regulator tube T1 is connected with the cathode of the voltage regulator tube T2;
the secondary side of the energy-taking coil is also respectively connected with one ends of a resistor R1 and a resistor R2, the other ends of the resistor R1 and the resistor R2 are respectively connected with two ends of a thyristor W2, and the other end of the resistor R2 is simultaneously connected with a control end of a thyristor W1.
Preferably, the dc protection circuit includes a MOS transistor J1, the source of the MOS transistor J1 is grounded, the drain of the MOS transistor J1 is connected to the positive electrode of the voltage output of the rectifying and filtering circuit, and the source gate of the MOS transistor J1 is connected to the control signal output terminal of the microprocessor.
A power taking control method is characterized in that: the method comprises the following steps:
step a, starting, and initializing after a microprocessor is powered on;
step b, the microprocessor calculates a real-time current value obtained by sampling the measuring coil according to the voltage value output by the alternating voltage conditioning circuit, and judges the current value;
c, the microprocessor judges whether the real-time current value obtained by the measuring coil is larger than a preset upper limit value or not, if so, the step k is executed, otherwise, the step d is executed;
d, the microprocessor judges whether the real-time current value obtained by the measuring coil is smaller than a preset lower limit value, if so, the step i is executed, otherwise, the step e is executed;
e, the microprocessor calculates PWM parameters needing to be rewritten according to the real-time current value;
step f, the microprocessor calculates the real-time voltage value output by the rectifying and filtering circuit according to the voltage value output by the rectifying and filtering circuit and judges the voltage value;
step g, the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is greater than a preset upper limit value, if so, the step k is executed, otherwise, the step h is executed;
step h, the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is smaller than a preset lower limit value, if so, the step i is executed, otherwise, the step j is executed;
step i, the microprocessor outputs a low level signal to the direct current protection circuit and returns to the step b;
step j, the microprocessor outputs the calculated PWM parameters to the direct current protection circuit and returns to the step b;
and step k, the microprocessor outputs a high-level signal to the direct-current protection circuit and returns to the step b.
Preferably, the PWM parameter to be rewritten in step e is a duty ratio.
Preferably, the duty cycle increases with increasing real-time current value.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the intelligent power-taking power supply and the power-taking control method of the electronic current transformer, the measuring coil and the energy-taking coil are arranged, the microprocessor respectively detects the alternating current signal and the direct current signal obtained by the measuring coil and the energy-taking coil, and controls the alternating current signal and the direct current signal through the direct current protection circuit, so that the current energy-taking power supply can operate safely, stably and reliably for a long time under the conditions of wide range and large current input. The current of the line can be monitored in real time, and the circuit protection parameters can be adjusted in real time according to the current; the energy-taking direct-current voltage can be monitored in real time, and the change of the load power can be quickly tracked, so that the power flow direction of the energy-taking circuit can be controlled.
2. The silicon controlled rectifier is adopted in the alternating current protection circuit to realize alternating current protection, so that the fault current of dozens of kiloamperes can be quickly protected and conducted, secondary overvoltage impact is limited, particularly when instantaneous lightning current impact occurs, the two types of protection are mutually matched, the energy control of steady-state and transient-state heavy current is completely realized, the heavy current protection is realized, and the safe and reliable operation of a power supply and electric equipment is ensured.
3. In the direct current protection circuit, an MOS element is adopted to realize short-circuit energy loopback protection, and because the MOS conduction impedance is extremely low, even if the secondary steady-state current is more than ten amperes and twenty amperes, the conduction voltage drop is not more than dozens of millivolts, the power consumption of the element can be very low, so that the temperature rise of local elements and the overall temperature rise of a power supply can be reduced, the power supply can be installed and operated on a high-voltage transmission line with thousands of amperes of rated current, and the safe and reliable power supply of on-line monitoring equipment is ensured.
4. The protection control signal of the direct current protection circuit is obtained from a direct current stabilized voltage power supply circuit, energy obtaining control during load power change is well achieved, particularly when the load is provided with an energy storage element, charging power can be automatically adjusted along with the size of energy storage capacity, and energy obtaining benefit maximization is achieved.
5. The microprocessor controls the direct current protection circuit by outputting the PWM signal, can perform PWM control, and can reduce the power consumption of elements as much as possible by improving the control frequency, thereby reducing the volume and the weight of the circuit. The intelligent energy-taking coil can easily monitor the line current and the working voltage in real time by utilizing the AD acquisition function of the microprocessor, adjust PWM control parameters in real time according to the set maximum and minimum values of the current through sampling, processing, storing and real-time comparing, track the load power change in real time according to the set maximum and minimum values of the voltage, and realize the functions of full output of small-current electric energy and timely returning of large-current energy.
6. The microprocessor is used, so that functions such as electric quantity monitoring, parameter setting, logic control and the like are easier to realize, protection control is more complete, the development trend of equipment intellectualization is met, the communication interface integrated with the microprocessor also provides a good solution for interconnection of everything, and equipment state monitoring and information uploading can be easily realized.
7. Through setting up AC protection circuit and direct current protection circuit, the heavy current continuous stable operation is realized to direct current protection, and the protection is strikeed to the super large current to alternating current protection realization. The two protections are mutually coordinated, so that the high-current protection function of the wide-range current power supply is better completed, and the wide-range current power supply can safely and reliably operate when high current is continuously or ultra-large current is impacted.
The dual protection operates simultaneously, the alternating current protection control detects alternating current voltage, the direct current protection control detects direct current voltage, and the alternating current protection control and the direct current voltage are coordinated and supplemented with each other, so that the problems that the heating value of a protection element is large and the temperature rise is high in the single alternating current protection control are solved, and the problem that the load requirement cannot be reflected by the single alternating current protection control under the condition that the load power is variable is solved.
Drawings
Fig. 1 is a schematic block diagram of an intelligent power supply of an electronic current transformer.
Fig. 2 is a schematic diagram of an electronic current transformer intelligent power supply alternating current protection circuit.
Fig. 3 is a schematic diagram of an intelligent power supply direct-current protection circuit of the electronic current transformer.
Fig. 4 is a flowchart of an intelligent power-taking control method of the electronic current transformer.
Detailed Description
FIG. 1 ~ 4 shows a preferred embodiment of the present invention, which is further described below with reference to FIG. 1 ~ 4.
As shown in fig. 1, the intelligent power supply of the electronic current transformer comprises a measuring coil and an energy-taking coil which are connected to an alternating current transmission line, wherein primary sides of the measuring coil and the energy-taking coil are arranged on the alternating current transmission line. The secondary side of the measuring coil is connected with the input end of the current signal conversion circuit, the output end of the current signal conversion circuit is connected with the input end of the alternating voltage conditioning circuit, and the output end of the alternating voltage conditioning circuit is connected with the microprocessor.
The energy-taking coil consists of a magnetic core and an enameled wire winding wound on the magnetic core, and obtains electric energy from the power transmission line by the electromagnetic induction principle, wherein the magnetic core is made of nanocrystalline alloy or permalloy materials with high initial permeability. The measuring coil is realized by a current transformer coil, such as a rogowski coil. The current conversion circuit is used for converting a current signal acquired by the measuring coil into a voltage signal, and can be realized through a sampling resistor. The alternating voltage conditioning circuit is realized by adopting an amplifying circuit consisting of a differential operational amplifier and is used for amplifying the voltage signal output by the current signal conversion circuit so as to meet the requirement of a microprocessor. The microprocessor is realized by a common commercially available singlechip with built-in AD conversion function and PWM output function.
The secondary side of the energy-taking coil is connected with the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is connected with the input end of the voltage conversion circuit, alternating current signals obtained from the energy-taking coil are firstly rectified and filtered by the rectifying and filtering circuit to obtain direct current voltage signals and then are sent to the voltage conversion circuit, and the voltage conversion circuit converts the direct current voltage signals obtained by rectifying and filtering into required direct current voltage and outputs the direct current voltage.
An alternating current protection circuit is arranged between the energy taking coil and the rectifying and filtering circuit, a direct current protection circuit and a direct current voltage conditioning circuit are arranged between the rectifying and filtering circuit and the voltage conversion circuit, and when an alternating current signal output by the energy taking coil exceeds a preset threshold value, the alternating current protection circuit provides protection. The output end of the microprocessor is connected with the input end of the direct current protection circuit, and when the direct current signal output by the rectifying and filtering circuit exceeds a preset threshold value, the direct current protection circuit provides protection. The input end of the direct current voltage conditioning circuit is connected between the rectification filter circuit and the voltage conversion circuit, the output end of the direct current voltage conditioning circuit is connected to the input end of the microprocessor, the direct current voltage conditioning circuit is realized by adopting an amplifying circuit composed of a differential operational amplifier, and the direct current voltage signal output by the rectification filter circuit is amplified to meet the requirement of the microprocessor.
As shown in fig. 2, the ac protection circuit includes a thyristor W1 ~ W2, a resistor R1 ~ R4, and a regulator T1 ~ T2, the secondary sides of the energy-extracting coils are respectively connected to two ends of the thyristor W1, the secondary sides of the energy-extracting coils are also respectively connected to one ends of a resistor R1 and a resistor R2, the other ends of the resistor R1 and the resistor R2 are respectively connected to two ends of the thyristor W2, the other end of the resistor R2 is simultaneously connected to a control end of the thyristor W1, the secondary sides of the energy-extracting coils are also respectively connected to an anode of the regulator T1 and one end of the resistor R4, the other end of the resistor R4 is simultaneously connected to the other end of the resistor R3 and the control end of the thyristor W2, the other end of the resistor R3 is connected to an anode of the regulator T2, and a cathode of the regulator.
When the value of the alternating voltage obtained by the secondary side of the energy taking coil exceeds the stable voltage of a voltage regulator tube T1 ~ T2, the voltage regulator tube T1 ~ T2 is broken down, and then the voltage value is output to sequentially conduct the controllable silicon W2 and the controllable silicon W1, so that the secondary side of the energy taking coil is short-circuited, and the protection effect is achieved.
The stable voltage of the voltage stabilizing tube T1 ~ T2 is the same as the output voltage of the voltage conversion circuit, so that the coordination control of the alternating current protection circuit and the direct current protection circuit is realized, and the direct current protection circuit is not directly connected with the direct current protection circuit.
As shown in fig. 3, the dc protection circuit includes a MOS transistor J1, the source of the MOS transistor J1 is grounded, the drain of the MOS transistor J1 is connected to the positive voltage output terminal of the rectifying and filtering circuit, and the source gate of the MOS transistor J1 is connected to the control signal output terminal of the microprocessor. The MOS tube J1 is controlled by the microprocessor, the microprocessor sends out a control signal to the gate of the MOS tube J1, the MOS tube J1 is triggered, and the voltage signal output by the rectifying and filtering circuit is grounded after the MOS tube is triggered.
As shown in fig. 4, a power-taking control method for an electronic current transformer intelligent power-taking power supply includes the following steps:
and starting to execute the power taking control method.
the microprocessor is initialized after being powered on.
the microprocessor calculates the real-time current value sampled by the measuring coil according to the voltage value output by the alternating voltage conditioning circuit, and judges the current value.
and the microprocessor judges whether the real-time current value obtained by the measuring coil is greater than a preset upper limit value or not, if so, the step 1013 is executed, and if not, the step 1005 is executed.
and the microprocessor judges whether the real-time current value obtained by the measuring coil is smaller than a preset lower limit value, if so, the step 1011 is executed, otherwise, the step 1006 is executed.
the microprocessor calculates protection parameters according to the real-time current value, the protection parameters comprise a voltage value, a current threshold value and PWM parameters, the PWM parameters comprise frequency, duty ratio and a dead zone value, when the protection parameters are calculated, the duty ratio in the PWM parameters is mainly calculated, and the calculation principle is as follows: the duty cycle increases with increasing real-time current value.
and the microprocessor calculates the duty ratio of the PWM parameters needing to be rewritten.
the microprocessor calculates the real-time voltage value output by the rectifying and filtering circuit according to the voltage value output by the direct-current voltage conditioning circuit, and judges the voltage value.
the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is greater than a preset upper limit value, if so, the step 1013 is executed, otherwise, the step 1010 is executed.
the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is smaller than a preset lower limit value, if so, the step 1011 is executed, otherwise, the step 1012 is executed.
the microprocessor outputs a low level signal to the dc protection circuit and returns to step 1003.
and the microprocessor outputs the calculated PWM parameters to the direct current protection circuit and returns to the step 1003.
the microprocessor outputs a high level signal to the dc protection circuit and returns to step 1003.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a power is got to electronic type current transformer intelligence which characterized in that: the device is provided with a measuring coil and an energy-taking coil, wherein the primary sides of the measuring coil and the energy-taking coil are connected to an alternating current transmission line, the secondary side of the measuring coil is connected with a current signal conversion circuit for converting a current signal output by the measuring coil into a voltage signal, and the output end of the current signal conversion circuit is connected with the input end of a microprocessor;
the secondary side of the energy-taking coil is connected with a rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with a voltage conversion circuit; a direct current protection circuit is arranged between the rectification filter circuit and the voltage conversion circuit, a switch device is arranged in the direct current protection circuit, a control signal output end of the microprocessor is connected with the direct current protection circuit to control the on-off of the switch device, and the output end of the rectification filter circuit is simultaneously connected with an input end of the microprocessor.
2. The electronic current transformer intelligent power supply according to claim 1, characterized in that: the output end of the current signal conversion circuit is also provided with an alternating voltage conditioning circuit, the output end of the current signal conversion circuit is connected with the input end of the alternating voltage conditioning circuit, and the output end of the alternating voltage conditioning circuit is connected with the input end of the microprocessor.
3. The electronic current transformer intelligent power supply according to claim 1, characterized in that: the output end of the rectifying and filtering circuit is also provided with a direct-current voltage conditioning circuit, the output end of the rectifying and filtering circuit is connected with the input end of the direct-current voltage conditioning circuit, and the output end of the direct-current voltage conditioning circuit is connected with the input end of the microprocessor.
4. The electronic current transformer intelligent power supply according to claim 1, characterized in that: an alternating current protection circuit is further arranged between the energy taking coil secondary side and the rectification filter circuit.
5. The electronic current transformer intelligent power-taking power supply as claimed in claim 4, wherein the alternating current protection circuit comprises a thyristor W2, a resistor R1 ~ R4 and a voltage regulator tube T1 ~ T2, the secondary side of the power-taking coil is respectively connected with the anode of a voltage regulator tube T1 and one end of a resistor R4, the other end of the resistor R4 is simultaneously connected with the other end of the resistor R3 and the control end of the thyristor W2, the other end of the resistor R3 is connected with the anode of a voltage regulator tube T2, and the cathode of the voltage regulator tube T1 is connected with the cathode of a voltage regulator tube T2;
the secondary side of the energy-taking coil is also respectively connected with one ends of a resistor R1 and a resistor R2, the other ends of the resistor R1 and the resistor R2 are respectively connected with two ends of a thyristor W2, and the other end of the resistor R2 is simultaneously connected with a control end of a thyristor W1.
6. The electronic current transformer intelligent power supply according to claim 1, characterized in that: the direct-current protection circuit comprises an MOS tube J1, the source electrode of the MOS tube J1 is grounded, the drain electrode of the MOS tube J1 is connected with the voltage output anode of the rectifying and filtering circuit, and the source gate electrode of the MOS tube J1 is connected with the control signal output end of the microprocessor.
7. An electricity-taking control method realized by using the intelligent electricity-taking power supply of the electronic current transformer as claimed in any one of the claims, characterized in that: the method comprises the following steps:
step a, starting, and initializing after a microprocessor is powered on;
step b, the microprocessor calculates a real-time current value obtained by sampling the measuring coil according to the voltage value output by the alternating voltage conditioning circuit, and judges the current value;
c, the microprocessor judges whether the real-time current value obtained by the measuring coil is larger than a preset upper limit value or not, if so, the step k is executed, otherwise, the step d is executed;
d, the microprocessor judges whether the real-time current value obtained by the measuring coil is smaller than a preset lower limit value, if so, the step i is executed, otherwise, the step e is executed;
e, the microprocessor calculates PWM parameters needing to be rewritten according to the real-time current value;
step f, the microprocessor calculates the real-time voltage value output by the rectifying and filtering circuit according to the voltage value output by the rectifying and filtering circuit and judges the voltage value;
step g, the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is greater than a preset upper limit value, if so, the step k is executed, otherwise, the step h is executed;
step h, the microprocessor judges whether the real-time voltage value output by the rectifying and filtering circuit is smaller than a preset lower limit value, if so, the step i is executed, otherwise, the step j is executed;
step i, the microprocessor outputs a low level signal to the direct current protection circuit and returns to the step b;
step j, the microprocessor outputs the calculated PWM parameters to the direct current protection circuit and returns to the step b;
and step k, the microprocessor outputs a high-level signal to the direct-current protection circuit and returns to the step b.
8. The power-taking control method according to claim 7, characterized in that: the PWM parameter to be rewritten in step e is a duty ratio.
9. The power-taking control method according to claim 8, characterized in that: the duty cycle increases with increasing real-time current value.
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| CN114325048A (en) * | 2021-12-27 | 2022-04-12 | 南方电网数字电网研究院有限公司 | Self-energy-taking flexible current measuring device |
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| CN207504647U (en) * | 2017-12-01 | 2018-06-15 | 华北电力大学（保定） | Wide area intelligence mutual inductance takes electric control system |
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