CN112886718A - Resonance compensation type current transformer induction power taking system - Google Patents
Resonance compensation type current transformer induction power taking system Download PDFInfo
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- CN112886718A CN112886718A CN202110058460.XA CN202110058460A CN112886718A CN 112886718 A CN112886718 A CN 112886718A CN 202110058460 A CN202110058460 A CN 202110058460A CN 112886718 A CN112886718 A CN 112886718A
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- 230000006698 induction Effects 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 238000004146 energy storage Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000005284 excitation Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000005674 electromagnetic induction Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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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
- 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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
Abstract
The invention discloses a resonance compensation type current transformer induction power taking system which comprises an energy taking CT module, a resonance compensation module, a protection module, a rectification filtering module, a direct current conversion module, an energy storage module and a control module, wherein the energy taking CT module, the resonance compensation module, the protection module, the rectification filtering module, the direct current conversion module and the energy storage module are sequentially connected with one another; the energy-taking CT module comprises an energy-taking magnetic core and a secondary coil and takes electricity from the power transmission line. The resonance compensation module comprises a resonance capacitor C which is used for forming resonance with the excitation inductor and increasing the energy taking power. And the energy release circuit in the protection module is used for unloading when the large current flows through the power transmission line. And the direct current conversion module is used for reducing the direct current voltage after rectification and filtration to a set voltage value. The control module comprises a control module for collecting electric parameters of the transmission line and the system and controlling the working mode of the system. Adopt resonance compensation module, promote the energy taking power, the energy taking when realizing the undercurrent, adopt energy release circuit to avoid appearing the overvoltage when the heavy current, the energy taking and the energy taking power promotion when having compromise the big or small electric current.
Description
Technical Field
The invention relates to the technical field of induction power taking, in particular to a resonance compensation type current transformer induction power taking system.
Background
In recent years, smart grids are rapidly developed, and in order to ensure safe and stable operation of the power grids, online monitoring equipment is widely applied to high-voltage cables. The current common power supply mode of the on-line monitoring equipment mainly comprises the following steps: the energy acquisition of the current transformer is realized by adopting a non-contact induction power acquisition technology, and compared with other modes, the current transformer has the advantages of high safety, low cost, small size, wide application range and the like, so that the current transformer is widely adopted. However, because the current range of the power transmission line is large, the current transformer induction power taking device has the problems that low current cannot be used, large current is easy to saturate, the power taking power is limited by the size of a magnetic core and the like, and different scholars adopt different schemes aiming at the problems. For improving the problem of large current saturation, an air gap magnetic core is adopted to reduce magnetic conductivity, or a compensation coil is additionally arranged to counteract primary current, or an unloading mode is adopted to discharge redundant energy; aiming at the problem that energy cannot be obtained at low current, a nanocrystalline material with high magnetic conductivity is used as a magnetic core to improve energy obtaining power at low current; aiming at the problem that the energy taking power is limited, the sectional area of the magnetic core is increased so as to improve the maximum energy taking power. Or a double-iron-core parallel operation mode is adopted, and current change of a line is adapted by switching different iron cores.
The scheme can solve the problems existing in different angle parts, is difficult to take into account, and solves the problems that the current range of the power transmission line is large, the low current of the current transformer induction power taking device cannot take energy, the large current is easy to saturate, and the energy taking power is limited by the size of the magnetic core.
Therefore, considering all aspects to realize current transformer induction power taking, the problem to be solved urgently at present is solved.
Disclosure of Invention
The invention aims to provide a resonance compensation type current transformer induction power taking system, which adopts a resonance compensation module to improve the energy taking power and realize energy taking at a small current, adopts an energy release circuit to avoid overvoltage at a large current and considers energy taking and energy taking power improvement at a large current.
The above object of the present invention is achieved by the following technical solutions:
a resonance compensation type current transformer induction power taking system comprises an energy taking CT module, a resonance compensation module, a protection module, a rectification filtering module, an energy storage module and a control module which are sequentially connected; the control module is respectively connected with the resonance compensation module, the protection module, the rectification filter module and the energy storage module; wherein, get and can CT module: the energy-taking device is used for being nested on a high-voltage cable and taking energy based on the electromagnetic induction principle; a resonance compensation module: the energy acquisition module is used for generating resonance with an inductor in the energy acquisition CT module and improving energy acquisition power; the protection module is used for protecting the whole system, and excessive energy is released when large current flows; the rectification filtering module is used for converting an alternating current signal of the preceding stage circuit into a direct current signal; the energy storage module is used for being matched with the power taking system to realize no dead zone power supply for the monitoring equipment; and the control module is used for controlling the modules to work and changing the working mode of the line according to the current of the high-voltage cable.
The invention is further configured to: the input of the direct current power supply conversion circuit is connected with the rectifying and filtering module, and the output of the direct current power supply conversion circuit is connected with the energy storage module and used for performing voltage amplitude conversion on the direct current power supply signal.
The invention is further configured to: the direct-current power supply conversion circuit comprises a chopper circuit for reducing the output voltage.
The invention is further configured to: the energy-taking CT module comprises an energy-taking magnetic core and a secondary coil, wherein the secondary coil is wound on the energy-taking magnetic core, and the energy-taking magnetic core is sleeved on the power transmission line.
The invention is further configured to: the resonance compensation module comprises a compensation capacitor which is connected in parallel with two ends of a secondary coil in the energy-taking CT module and is used for generating resonance with the excitation inductor.
The invention is further configured to: the protection module comprises an anti-surge circuit, an energy release circuit and a voltage division circuit, wherein the input of the anti-surge circuit is connected with the output of the resonance compensation module, the output of the energy release circuit is connected with the output of the anti-surge circuit, and the input of the voltage division circuit is connected with the output of the energy release circuit.
The invention is further configured to: the energy storage module comprises a control sub-circuit and a battery pack, the control sub-circuit is connected with the battery pack in series, the input of the control sub-circuit is connected with the output of the filter circuit, the output of the control sub-circuit is connected with the positive end of the battery pack, and the control end of the control sub-circuit is connected with the control module and used for controlling the working mode of the battery pack according to the control signal of the control module.
The invention is further configured to: the control module comprises a control chip, an ADC circuit and a power circuit, the ADC circuit and the power circuit are respectively connected with the control chip, the ADC circuit is used for collecting high-voltage cable electrical parameters and energy-taking CT module electrical parameters, and the power circuit is used for switching the working mode of the system according to control signals of the control chip.
The invention is further configured to: the system also comprises a storage circuit used for storing the electrical parameters in the operation process of the system.
The invention is further configured to: a battery circuit is also included for providing power to the control module.
Compared with the prior art, the beneficial technical effects of this application do:
1. the resonance compensation module is arranged to form resonance with the energy taking inductor, so that energy taking power is improved, energy taking is guaranteed to be achieved under the condition of low current, and energy taking is increased under the condition of high current;
2. furthermore, the protection module is arranged, so that damage of surge to the circuit is prevented, redundant energy is consumed through the energy release circuit in heavy current, and the safety of the energy taking system is guaranteed;
3. furthermore, the control circuit monitors the change of each parameter in the circuit in real time, adjusts the working mode in time and ensures the efficient work of the system.
Drawings
Fig. 1 is a schematic structural diagram of an induction power taking system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an energy-extracting CT module/resonance compensation module according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a protection module according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a rectifying and filtering structure according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a DC conversion module according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of an energy storage module according to an exemplary embodiment of the present application;
FIG. 7 is a schematic diagram of a control module according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The application discloses an induction power taking system of a resonance compensation type current transformer, which comprises an energy taking CT module, a resonance compensation module, a protection module, a rectification filtering module, a direct current conversion module, an energy storage module and a control module which are sequentially connected as shown in figure 1; the control module is respectively connected with the resonance compensation module, the protection module, the rectification filtering module and the energy storage module.
The energy-taking CT module comprises an energy-taking magnetic core and a secondary coil, wherein the secondary coil is wound on the energy-taking magnetic core, and the energy-taking magnetic core is sleeved on a phase wire of the power transmission line. Electricity is taken from a power transmission line by an electromagnetic induction principle; when a current flows through the transmission line, an electromotive force is induced on the secondary side.
The energy-taking magnetic core is provided with an air gap for inhibiting large current saturation.
In a specific embodiment of this application, the magnetic core of getting can adopts the silicon steel sheet of C type, forms the ring from the both sides of transmission line electric wire and cup joints, and the whole device is directly overlapped on one of them looks electricity of transmission line.
An equivalent circuit diagram of the energy-taking CT module is shown in fig. 2, electromagnetic induction is equivalent to a current source, equivalent excitation inductance Lm of a secondary coil and equivalent internal resistance Rm; the excitation inductance Lm and the equivalent internal resistance Rm are connected in parallel at two ends of the current source.
The resonance compensation module comprises a resonance capacitor C, and the equivalent resistance of the rear-stage circuit is RL。
Under the condition of considering the excitation inductance Lm and the equivalent internal resistance Rm, the power taking power with the resonance capacitor C and the power taking power without the resonance capacitor C are respectively analyzed.
Power supply without resonance capacitor C:
wherein the denominator is the equivalent resistance RLWhen the denominator takes the minimum value, PLThe maximum value can be obtained, so when:
time, maximum power PL1Comprises the following steps:
where ω is 2 π f, f denotes the frequency of the alternating current, n denotes the number of turns of the coil winding, i1Representing the transmission line current.
The power taking power with the resonant capacitor C is as follows:
according to the principle of impedance matching, when the equivalent resistance R of the circuit at the later stageLWhen the equivalent impedance of the compensation capacitor C is equal to the conjugate of the internal impedance of the energy acquisition CT module, the load can obtain the maximum power, that is:
at this time, it can be:
maximum power P when using compensation capacitorsL2Comprises the following steps:
comparing equations (3) and (6), it can be seen that, when the same transmission line current is applied, the compensation capacitor is connected in parallel at the secondary side, so that the maximum power obtained by the induction power taking device can be increased:
because the energy-taking magnetic core is provided with an air gap, the equivalent excitation inductance Lm is obviously reduced, and Rm is almost unchanged, so that the ratio of Rm to Lm is obviously increased, and the energy-taking power can be obviously increased by connecting a compensation capacitor in parallel on the secondary side.
As shown in fig. 3, the protection module includes an anti-surge circuit, an energy release circuit, and a sampling circuit, wherein an output of the anti-surge circuit is connected to an input of the energy release circuit, and an input of the sampling circuit is connected to an output of the energy release circuit. The output end of the sampling circuit is connected to the control module.
The surge protection circuit comprises a voltage dependent resistor Y1, an inductor L1 and a capacitor C1, wherein the voltage dependent resistor Y1 is connected between two output ends of the resonance compensation module in parallel, the inductor L1 and the capacitor C1 are connected in series and then connected between the two output ends of the resonance compensation module in parallel, and the output V2 of the surge protection circuit is led out from the connection point of the inductor L1 and the capacitor C1.
The anti-surge circuit mainly aims at sudden increase of line voltage caused by lightning strike on a power transmission line and plays a role in protecting the system. When the transmission line works normally, the voltage dependent resistor Y is added1The voltage above is below its threshold and the current through it is extremely small, corresponding to a resistance of infinite value. However, when the line is struck by lightning, the voltage suddenly increases, the voltage on the voltage dependent resistor exceeds the threshold value, the current flowing through the voltage dependent resistor increases suddenly, and the voltage is equivalent to a resistor with infinite resistance value, which is equivalent to short-circuiting a rear-stage circuit, thereby playing a role of protection.
The input of the energy discharge circuit is connected with the output V2 of the anti-surge circuit and comprises an insulated gate bipolar transistor IGBT-T connected in series1Power resistor RSPower resistance RSOne end of which is connected with a transistor IGBT-T1One terminal of (1), transistor IGBT-T1The other end of the first and second transistors is connected with the output of the anti-surge circuit, and a transistor IGBT-T1The control end of the power resistor R is connected with the control moduleSAnd the other end of the switch is connected with an alternating current ground GND. Is used for the large current of the power transmission line for a long time,by controlling the transistor IGBT-T1By means of a power resistor RSThe redundant energy is consumed, and the unloading function is achieved.
The sampling circuit comprises sampling resistors R connected in series2、R3At the sampling resistor R2、R3Is sampled by a series sampling resistor R2、R3One end of the combination is connected with the output V2 of the anti-surge circuit, and the other end is connected with the alternating current ground GND. By monitoring the sampling voltage V3 and the circuit voltage V2, the control module judges whether the sampling voltage V3 belongs to the electricity utilization interval, if not, the system goes wrong, and if so, the system runs normally.
As shown in fig. 4, the rectifying and filtering module includes a rectifying full bridge circuit and a filtering circuit. The input of the rectification full bridge circuit is connected with the output V2 of the anti-surge circuit, and the output of the rectification full bridge circuit is connected with the output of the filter circuit.
The filter circuit adopts an LC pi-type filter circuit and comprises an inductor L2 and a capacitor C2/C3/C4, the capacitor C2/C3 is connected in series and then connected in parallel between two output ends of a rectification full bridge circuit, one output end of the rectification full bridge circuit is connected with one end of an inductor L2, the other end of the inductor L2 is connected with one end of a capacitor C4 and an output V4 of a rectification filter module, and the other end of the capacitor C4 is connected with a direct current power supply ground DGND of the rectification full bridge circuit.
The rectification filtering module is used for converting alternating current into direct current, filtering out clutter and multiple harmonics and obtaining direct current V4.
And the direct current conversion module comprises a BUCK chopper circuit and is used for reducing the direct current voltage after rectification and filtration to a set voltage value.
The BUCK chopper circuit comprises a switch sub-circuit, a charging circuit and a follow current circuit, wherein the charging circuit is connected with the output end of the switch sub-circuit after being connected with the follow current circuit in parallel, and the output end of the charging circuit is connected with the input end of the energy storage module.
As shown in fig. 5, the switch sub-circuit includes a control switch T2, a control end of the control switch T2 is connected to the control module, one end of the control switch is connected to the output of the rectifying and filtering module, and the other end is connected to the inputs of the charging circuit and the freewheeling circuit.
The charging circuit comprises a charging inductor L3 and a charging capacitor C5, the other end of the charging inductor L3 is connected with one end of the charging capacitor C5 and the output V5 of the direct current conversion module,
the freewheeling circuit comprises a freewheeling diode Ds, the negative end of the freewheeling diode Ds is connected with the other end of the control switch, and the positive end of the freewheeling diode Ds and the other end of the charging capacitor C5 are connected with a direct current power supply ground DGND.
When the control switch T2 is closed, the freewheeling diode Ds is turned off, and at this time, the circuit not only supplies power to the subsequent circuit, but also charges the inductor L3 and the capacitor C5, and after the switch T2 is turned off, the inductor L3 generates a reverse electromotive force, so that the freewheeling diode Ds is turned on to continue supplying power to the subsequent circuit.
The energy storage module comprises a control switch T3 and a battery, and the working mode of the battery is controlled by controlling the on-off of the switch T3.
As shown in fig. 6, the control switch T3 is connected in series with the battery, the control terminal of the control switch T3 is connected to the control module, the control module controls the on/off of the control switch T3, one terminal of the control switch T3 is connected to the positive electrode of the battery, and the other terminal is connected to the dc conversion module output V5.
As shown in fig. 7, the control module includes a control module including a control chip, an ADC circuit, a power circuit, a battery circuit, a storage circuit, and an indicator light circuit, the ADC circuit, the power circuit, the battery circuit, the storage circuit, and the indicator light circuit are respectively connected to the control chip, the ADC circuit is used to collect electrical parameters of the high-voltage cable and electrical parameters of the energy-taking CT module, and includes a sampling circuit connected to the protection module.
The power circuit comprises an analog switching circuit which is used for switching the working mode of the system according to the control signal of the control chip.
The working modes of the system comprise: the energy storage module supplies power independently, the load is supplied with power in a resonance mode, the power supply and the energy storage module supply power to the load in the same mode, and the power supply supplies power to the load and charges the energy storage module simultaneously
And the storage module comprises an SD card and the like which can store data and is used for storing the electrical parameters in the operation process of the system.
And the battery circuit is used for providing power for the control module.
And the indicating lamp circuit is used for indicating the working state.
In another embodiment of the present application, a control switch is added in the resonance compensation module and the protection module, and is connected to the control module, when the control circuit detects that a small current flows through the output line, the control circuit switches into the resonance compensation module, and the energy taking power of the transmission line at a low current is increased by using the resonance between the resonance compensation capacitor and the excitation inductor in the energy taking CT module; and when the output line is detected to flow large current, the resonance compensation module is switched out, and an energy release circuit in the protection module is switched in for unloading.
In yet another embodiment of the present application, the control chip employs an STM32 family chip.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a resonance compensation formula current transformer induction electricity taking system which characterized in that: the energy acquisition CT device comprises an energy acquisition CT module, a resonance compensation module, a protection module, a rectification filtering module, an energy storage module and a control module which are connected in sequence; the resonance compensation module, the protection module, the rectification filtering module and the energy storage module are sequentially connected; the control module is respectively connected with the resonance compensation module, the protection module, the rectification and filtering module and the energy storage module,
energy-taking CT module: the energy-taking device is used for being nested on a high-voltage cable and taking energy based on the electromagnetic induction principle;
a resonance compensation module: the energy acquisition module is used for generating resonance with an inductor in the energy acquisition CT module and improving energy acquisition power;
the protection module is used for protecting the whole system, and excessive energy is released when large current flows;
the rectification filtering module is used for converting an alternating current signal of the preceding stage circuit into a direct current signal;
the energy storage module is used for being matched with the power taking system to realize no dead zone power supply for the monitoring equipment;
and the control module is used for controlling the modules to work and changing the working mode of the line according to the current of the high-voltage cable.
2. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the input of the direct current power supply conversion circuit is connected with the rectifying and filtering module, and the output of the direct current power supply conversion circuit is connected with the energy storage module and used for performing voltage amplitude conversion on the direct current power supply signal.
3. The resonance compensation type current transformer induction power taking system according to claim 2, characterized in that: the direct-current power supply conversion circuit comprises a chopper circuit for reducing the output voltage.
4. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the energy-taking CT module comprises an energy-taking magnetic core and a secondary coil, wherein the secondary coil is wound on the energy-taking magnetic core, and the energy-taking magnetic core is sleeved on the power transmission line.
5. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the resonance compensation module comprises a compensation capacitor which is connected in parallel with two ends of a secondary coil in the energy-taking CT module and is used for generating resonance with the excitation inductor.
6. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the protection module comprises an anti-surge circuit, an energy release circuit and a voltage division circuit, wherein the input of the anti-surge circuit is connected with the output of the resonance compensation module, the output of the energy release circuit is connected with the output of the anti-surge circuit, and the input of the voltage division circuit is connected with the output of the energy release circuit.
7. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the energy storage module comprises a control sub-circuit and a battery pack, the control sub-circuit is connected with the battery pack in series, the input of the control sub-circuit is connected with the output of the filter circuit, the output of the control sub-circuit is connected with the positive end of the battery pack, and the control end of the control sub-circuit is connected with the control module and used for controlling the working mode of the battery pack according to the control signal of the control module.
8. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: the control module comprises a control chip, an ADC circuit and a power circuit, the ADC circuit and the power circuit are respectively connected with the control chip, the ADC circuit is used for collecting high-voltage cable electrical parameters and energy-taking CT module electrical parameters, and the power circuit is used for switching the working mode of the system according to control signals of the control chip.
9. The resonance compensation type current transformer induction power taking system according to claim 8, characterized in that: the system also comprises a storage circuit used for storing the electrical parameters in the operation process of the system.
10. The resonance compensation type current transformer induction power taking system according to claim 1, characterized in that: a battery circuit is also included for providing power to the control module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113394888A (en) * | 2021-06-29 | 2021-09-14 | 上海电机学院 | Online energy-taking power supply device based on power transmission line |
| CN113470943A (en) * | 2021-07-07 | 2021-10-01 | 贵州电网有限责任公司 | Electromagnetic induction type electricity taking device based on direct current ripple |
| CN114285178A (en) * | 2021-12-03 | 2022-04-05 | 西安交通大学 | Electromagnetic induction type magnetic energy collector based on capacitive energy storage and power increasing method |
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| CN110829619A (en) * | 2019-11-05 | 2020-02-21 | 长沙理工大学 | Power transmission line energy taking device with impedance adjusting function and application method thereof |
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| CN113394888A (en) * | 2021-06-29 | 2021-09-14 | 上海电机学院 | Online energy-taking power supply device based on power transmission line |
| CN113470943A (en) * | 2021-07-07 | 2021-10-01 | 贵州电网有限责任公司 | Electromagnetic induction type electricity taking device based on direct current ripple |
| CN114285178A (en) * | 2021-12-03 | 2022-04-05 | 西安交通大学 | Electromagnetic induction type magnetic energy collector based on capacitive energy storage and power increasing method |
| CN114285178B (en) * | 2021-12-03 | 2023-08-18 | 西安交通大学 | Electromagnetic induction type magnetic energy collector based on capacitive energy storage and power lifting method |
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