CN117375247A - Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking - Google Patents
Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking Download PDFInfo
- Publication number
- CN117375247A CN117375247A CN202311666208.2A CN202311666208A CN117375247A CN 117375247 A CN117375247 A CN 117375247A CN 202311666208 A CN202311666208 A CN 202311666208A CN 117375247 A CN117375247 A CN 117375247A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 230000003321 amplification Effects 0.000 title claims abstract description 15
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 15
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 19
- 230000002457 bidirectional effect Effects 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Classifications
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a self-powered current signal saturation amplification broadband modulation and transmission system, which is used for injecting a high-frequency carrier signal into a power grid by a zero-sequence current transformer, and comprises the following steps: a carrier modulation transmission integrated circuit that generates a high-frequency carrier signal of a target frequency, which is injected into the power grid via the secondary side of the current transformer; and the voltage stabilizing circuit is used for self-powering from a power grid, converting the secondary side induced current of the current transformer into direct current, providing direct current power for the carrier modulation and transmission integrated circuit, and controlling the amplitude of the high-frequency modulation signal.
Description
Technical Field
The invention relates to signal broadband modulation and transmission, in particular to a current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking.
Background
There are many methods for grounding and positioning a single-phase fault of a distribution network, for example, CN106154118A discloses a distributed fault line selection and positioning system for a zero-sequence current transformer, which sets a zero-sequence current transformer group in different sections of the distribution network, injects high-frequency signals with different frequencies into a power grid through the zero-sequence current transformer, and transmits the high-frequency signals to a receiving device through a power carrier mode, but the zero-sequence current transformers are usually installed in places which are difficult to maintain daily and cannot conveniently obtain an external power supply, such as underground cables or overhead lines, and cannot supply power to the high-frequency signal generating device through energy storage devices such as a battery or external alternating current power supply. It is therefore critical to such a system how to generate high frequency signals of different frequencies without the need for external power.
Disclosure of Invention
The invention provides a self-powered current signal saturated amplification broadband modulation and transmission system, which solves the power supply problem of a high-frequency signal generating device in the single-phase fault grounding line selection and positioning process of a distribution network.
According to an aspect of the embodiment, there is provided a self-powered current signal saturation amplification broadband modulation and transmission system for injecting a high frequency carrier signal into a power grid by a zero sequence current transformer, the system comprising: the carrier modulation and transmission integrated circuit generates a high-frequency carrier signal with target frequency, and the high-frequency carrier signal is mixed with a power frequency signal on the secondary side of the current transformer and then injected into a power grid through the secondary side of the current transformer; and the voltage stabilizing circuit is used for self-powering from a power grid, converting the secondary side induced current of the current transformer into direct current, providing direct current power for the carrier modulation and transmission integrated circuit, and simultaneously controlling the amplitude of the high-frequency modulation signal of the high-frequency carrier signal.
In some examples, the carrier modulation and transmission integrated circuit comprises a carrier signal generating circuit, a driving circuit and a bidirectional switch, wherein the carrier signal generating circuit, the driving circuit, the bidirectional switch and the secondary side of the current transformer are sequentially connected, the carrier signal generating circuit generates a high-frequency carrier signal, and the high-frequency carrier signal performs switch control on the bidirectional switch through the driving circuit to realize high-frequency modulation on zero-sequence current.
In some examples, the voltage stabilizing circuit comprises a full-bridge rectifying circuit, an error amplifier and a bleeder circuit which are sequentially connected, wherein the full-bridge rectifying circuit is connected to the secondary side of the zero-sequence current transformer, and the output end of the full-bridge rectifying circuit sequentially passes through a resistor R 1 And a voltage stabilizing tube D 5 Connected with GND, resistor R 1 And a voltage stabilizing tube D 5 The voltage between them is taken as the reference voltage V ref The direct current output of the full-bridge rectifying circuit is filtered by a capacitor C and then is sent into a carrier modulation and transmission integrated circuit, and the reference voltage V ref And a capacitor C voltage input error amplifier, the capacitor C voltage exceeding the reference voltage V ref Then, the exceeding error value controls the bleeder circuit to bleeder the redundant charges in the capacitor C through the control signal generated by the error amplifier so as to reduce the voltage of the capacitor C and stabilize the direct current voltage at V ref The method comprises the steps of carrying out a first treatment on the surface of the Capacitor C has a voltage not exceeding the reference voltage V ref Saturation amplification of small currents is achieved.
In some examples, by varying the reference voltage V ref Changing the intensity of the high frequency carrier signal transmission.
In some examples, the bi-directional switch includes two MOS transistors T 1 、T 2 And an antiparallel diode D 1 、D 2 。
In some examples, the full bridge rectifier circuit is formed from diode D 3 、D 4 Diode D of two-way switch 1 、D 2 The composition is formed.
In some examples, diode D 3 、D 4 MOS tube T 1 、T 2 The leakage reactance of the current transformer forms a double BOOST circuit.
The invention has the beneficial effects that: 1. the invention provides an integrated carrier modulation and emission circuit, which can carry out aliasing of a high-frequency carrier signal and a power frequency signal and inject the aliasing into a power grid by only one set of system; 2. the system automatically gets electricity from a power grid, an external power supply is not needed, an energy-taking circuit and a carrier modulation circuit are integrated, the number of devices is reduced, and the inherent BOOST characteristic of the circuit is utilized to obtain the electric energy required by the system when the zero sequence current is very weak; 3. and the zero-sequence current signal is subjected to saturation amplification, no matter whether the zero-sequence current is strong or weak, the system can generate a strong high-frequency modulation signal, and the strength of signal transmission can be adjusted according to the requirement.
Drawings
FIG. 1 is a schematic diagram of a self-powered current signal saturation amplification wideband modulation and transmission system according to an embodiment of the present invention.
Detailed Description
FIG. 1 is a schematic diagram of a self-powered current signal saturation amplification broadband modulation and transmission system. As shown in fig. 1, the system includes a carrier modulation transmission integrated circuit and a voltage stabilizing circuit.
The carrier modulation and transmission integrated circuit comprises a carrier signal generating circuit, a driving circuit and a bidirectional switch.
The carrier signal generating circuit is used for generating a high-frequency carrier signal, and the high-frequency carrier signal is injected into the circuit through the secondary side of the current transformer. The carrier signal generating circuit structure has various solutions in the prior art, and the present invention is not repeated.
In the present embodiment, T 1 、T 2 Two MOSFET tubes and anti-parallel diode D thereof 1 、D 2 The bidirectional switch is constituted, but the device and circuit configuration used for the bidirectional switch are not limited thereto.
The carrier signal generating circuit generates a high-frequency carrier signal, then the high-frequency carrier signal carries out switching control on a bidirectional switch (MOSFET tube in figure 1) through the driving circuit, and carries out high-frequency modulation on zero-sequence current, so that high-frequency current is generated on the secondary side of the current transformer, a high-frequency modulation signal (the amplitude value is the voltage amplitude value of the voltage stabilizing circuit) is generated on the secondary side of the current transformer, and the modulated high-frequency carrier signal is subjected to electromagnetic transformation of the zero-sequence current transformer, then is mixed with a power frequency signal and injected into a power grid.
As shown in FIG. 1, the carrier frequency to be transmitted, e.g., 10kHz/11kH, is first determined, and then the carrier signal generation module is designed to generate a carrier signal based on the target frequencyThe carrier signal of the target frequency generates drive signals for the MOESFET's T in FIG. 1 via a drive circuit, which drive signals respectively control the MOESFET's T in FIG. 1 1 And T 2 And the high-frequency carrier wave with the frequency information is finally transmitted out through the power grid.
The voltage stabilizing circuit is used for providing direct current power supply with stable voltage for the carrier signal generating circuit and determining the amplitude of the high-frequency modulation signal. The energy of direct current power supply is derived from a power grid, secondary side induced current of a current transformer is rectified, filtered and stabilized, and direct current power supply with stable voltage can be obtained, and the specific circuit structure is as follows: first by diode D 3 、D 4 And MOSFET T 1 、T 2 And transformer leakage reactance forms a double BOOST circuit, and BOOST conversion is completed while high-frequency control is performed on the MOS tube;
furthermore, diode D 1 、D 2 And D 3 、D 4 A full-bridge rectifying circuit is formed, and secondary side alternating current of the current transformer is rectified into direct current; the capacitor C at the output end of the voltage stabilizing circuit filters the rectified current; the output end of the voltage stabilizing circuit sequentially passes through a resistor R 1 And a voltage stabilizing tube D 5 Connected with GND, resistor R 1 And a voltage stabilizing tube D 5 The voltage between them is taken as the reference voltage V ref If the secondary current of the current transformer is smaller, the voltage of the capacitor C does not exceed the reference voltage V ref At this time, the current transformer is equivalent to a secondary open circuit, so that saturation amplification of small current is realized (the secondary open circuit of the transformer is equivalent to a very large transformation ratio, so that the current with small secondary side can be amplified); if the secondary current of the current transformer is larger, after the voltage at two ends of the capacitor C exceeds the reference voltage, the exceeding error value generates a control signal through an error amplifier (integrating circuit, comparator and drive in FIG. 1) to control a bleeder circuit (MOSFET T) 3 ) Discharging redundant charges in the capacitor to reduce the capacitor voltage, so that the direct current voltage is stabilized at V ref Nearby, change V ref The rectified dc voltage can be varied to vary the intensity of the high frequency signal transmission. I.e. reference voltage V ref And the voltage of the capacitor C passes through an error amplifier, and the generated error signal drives the MOSFET T 3 Switching on and off when the capacitance voltage rises above the reference voltage, T 3 The duty cycle of conduction is increased and the excess charge passes through T 3 The voltage of the capacitor C decreases due to the bleeding.
Claims (7)
1. The utility model provides a saturation amplification broadband modulation and transmission system of current signal of self-electricity-taking, its characterized in that, this system is used for zero sequence current transformer to pour into high frequency carrier wave signal into the electric wire netting, and said system includes:
the carrier modulation and transmission integrated circuit generates a high-frequency carrier signal with target frequency, and the high-frequency carrier signal is mixed with a power frequency signal on the secondary side of the current transformer and then injected into a power grid through the secondary side of the current transformer; and
and the voltage stabilizing circuit is used for self-powering from a power grid, converting the secondary side induced current of the current transformer into direct current, providing direct current power for the carrier modulation and transmission integrated circuit, and controlling the amplitude of the high-frequency modulation signal of the high-frequency carrier signal.
2. The self-powered current signal saturated amplification broadband modulation and transmission system according to claim 1, wherein the carrier modulation and transmission integrated circuit comprises a carrier signal generating circuit, a driving circuit and a bidirectional switch, the secondary sides of the carrier signal generating circuit, the driving circuit, the bidirectional switch and the current transformer are sequentially connected, the carrier signal generating circuit generates a high-frequency carrier signal, and the high-frequency carrier signal performs switch control on the bidirectional switch through the driving circuit to realize high-frequency modulation on zero-sequence current.
3. The self-powered current signal saturated amplifying broadband modulation and transmission system according to claim 2, wherein the voltage stabilizing circuit comprises a full-bridge rectifying circuit, an error amplifier and a bleeder circuit which are sequentially connected, the full-bridge rectifying circuit is connected to the secondary side of the zero-sequence current transformer, and the output end of the full-bridge rectifying circuit sequentially passes through a resistor R 1 And a voltage stabilizing tube D 5 And GND is connected with resistor R 1 And a voltage stabilizing tube D 5 The voltage between them is taken as the reference voltage V ref The direct current output of the full-bridge rectifying circuit is filtered by a capacitor C and then is sent into a carrier modulation and transmission integrated circuit, and the reference voltage V ref And a capacitor C voltage input error amplifier, the capacitor C voltage exceeding the reference voltage V ref Then, the exceeding error value controls the bleeder circuit to bleeder the redundant charges in the capacitor C through the control signal generated by the error amplifier so as to reduce the voltage of the capacitor C and stabilize the direct current voltage at V ref The method comprises the steps of carrying out a first treatment on the surface of the Capacitor C has a voltage not exceeding the reference voltage V ref Saturation amplification of small currents is achieved.
4. The self-powered current signal saturated amplified wideband modulation and transmission system of claim 3, wherein the reference voltage V is varied by ref Changing the intensity of the high frequency carrier signal transmission.
5. The self-powered current signal saturated amplification broadband modulation and transmission system as claimed in claim 3, wherein the bidirectional switch comprises two MOS transistors T 1 、T 2 And an antiparallel diode D 1 、D 2 。
6. The self-powered current signal saturated amplified wideband modulation and transmission system of claim 5, wherein the full bridge rectifier circuit comprises diode D 3 、D 4 Diode D of two-way switch 1 、D 2 The composition is formed.
7. The self-powered current signal saturated amplified wideband modulation and transmission system of claim 6, wherein diode D 3 、D 4 MOS tube T 1 、T 2 The leakage reactance of the current transformer forms a double BOOST circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311666208.2A CN117375247A (en) | 2023-12-07 | 2023-12-07 | Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311666208.2A CN117375247A (en) | 2023-12-07 | 2023-12-07 | Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking |
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| Publication Number | Publication Date |
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| CN117375247A true CN117375247A (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311666208.2A Pending CN117375247A (en) | 2023-12-07 | 2023-12-07 | Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638114A (en) * | 2012-04-24 | 2012-08-15 | 深圳市深泰明科技有限公司 | Power supply device of current transformer |
| CA2865757A1 (en) * | 2013-09-30 | 2015-03-30 | Michael Jordan Kadonoff | Electrical current measuring apparatus and method |
| CN106154118A (en) * | 2016-09-29 | 2016-11-23 | 武汉科技大学 | A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner and method |
-
2023
- 2023-12-07 CN CN202311666208.2A patent/CN117375247A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638114A (en) * | 2012-04-24 | 2012-08-15 | 深圳市深泰明科技有限公司 | Power supply device of current transformer |
| CA2865757A1 (en) * | 2013-09-30 | 2015-03-30 | Michael Jordan Kadonoff | Electrical current measuring apparatus and method |
| CN106154118A (en) * | 2016-09-29 | 2016-11-23 | 武汉科技大学 | A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner and method |
Non-Patent Citations (2)
| Title |
|---|
| 伊贵业: "用在线监测器的配电网故障定位法", 《清华大学学报》, 30 July 2007 (2007-07-30), pages 2 * |
| 董凌凯: "基于Rogowski线圈的简易配电自动化测控终端", 《2008中国电力系统保护与控制学术研讨会论文集》, pages 1 * |
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