CN-121546823-B - Corona energy-taking method, device and controller for extra-high voltage circuit

CN121546823BCN 121546823 BCN121546823 BCN 121546823BCN-121546823-B

Abstract

The application relates to a corona energy taking method and device for an extra-high voltage circuit and a controller. The method comprises the steps of obtaining a corona electric energy signal through a corona discharge electrode arranged on an extra-high voltage circuit, carrying out transient high-voltage spike absorption and impulse noise filtering on the corona electric energy signal to obtain an equivalent input signal, carrying out maximum power tracking on an energy taking circuit based on the equivalent input signal to enable energy taking power of the energy taking circuit to be converged to a maximum power point, wherein the energy taking circuit is a direct current conversion circuit with an adjustable characteristic of an equivalent input resistor, and maintaining a current driving signal of the energy taking circuit under the condition that the energy taking power is tracked to the maximum power point, so that the energy taking circuit continuously works within an allowable deviation range of the maximum power point. The corona energy taking method can be used for effectively achieving corona energy taking on the extra-high voltage circuit.

Inventors

XIA GULIN
HOU MINGCHUN
JIN HUI
TAN BINGYUAN
MAO QIANG
WEI XIAOXING
GUO JIANBAO
SU GUOLEI
XIAO YUKUN
YAN SHUAI
LI XIAOXIA
Jing Maoheng
ZHANG XIAOBO
SUN XIANHE
YUAN RUIMIN
LIU MING
XIAO XIONG
LI CHUN
REN CHENGLIN
CHU JINWEI
LU WENHAO
LV JINZHUANG

Assignees

中国南方电网有限责任公司超高压输电公司电力科研院

Dates

Publication Date: 20260505
Application Date: 20260119

Claims (10)

1. The corona energy taking method for the extra-high voltage circuit is characterized by comprising the following steps of: Acquiring a corona electric energy signal through a corona discharge electrode arranged on an extra-high voltage circuit; performing transient high-voltage spike absorption and impulse noise filtering on the corona electric energy signal to obtain an equivalent input signal; Based on the equivalent input signal, carrying out maximum power tracking on an energy taking circuit, so that the energy taking power of the energy taking circuit is converged to a maximum power point; and under the condition that the energy taking power is tracked to a maximum power point, maintaining the current driving signal of the energy taking circuit, so that the energy taking circuit continuously works within the allowable deviation range of the maximum power point.
2. The method of claim 1, wherein said subjecting said corona energy signal to transient high voltage spike absorption and impulse noise filtering results in an equivalent input signal comprising: Performing transient absorption on the corona electric energy signal through a high-voltage transient absorption unit; and processing the corona electric energy signal after transient absorption through a preset filter network to obtain an equivalent input signal.
3. The method of claim 1, wherein the maximum power tracking of the energy harvesting circuit based on the equivalent input signal comprises: based on the equivalent input signal, obtaining the equivalent input power of the current sampling period; Adjusting the tracking step length according to the equivalent input power of the current sampling period and the equivalent input power of the last sampling period; and carrying out maximum power tracking on the energy-taking circuit based on the adjusted tracking step length until the maximum power point is reached.
4. A method according to claim 3, wherein said adjusting the tracking step according to the equivalent input power of the current sampling period and the equivalent input power of the last sampling period comprises: determining the variation between the equivalent input power of the current sampling period and the equivalent input power of the last sampling period; and adjusting the tracking step length according to the variation and at least one preset step length adjustment threshold.
5. The method of claim 4, wherein the determining a tracking step size based on the change amount and at least one preset step size adjustment threshold comprises: Adjusting the tracking step length under the condition that the absolute value of the variation is larger than a first preset threshold value; Reducing the tracking step length under the condition that the absolute value of the variation is smaller than or equal to the first preset threshold value and larger than a second preset threshold value; And under the condition that the absolute value of the variation is smaller than or equal to the second preset threshold value, keeping the tracking step length unchanged.
6. The method of claim 3, wherein the energy capturing circuit is a DC conversion circuit with an adjustable characteristic of an equivalent input resistance, wherein the maximum power tracking of the energy capturing circuit based on the equivalent input signal further comprises: According to the adjusted tracking step length, adjusting the equivalent input resistance of the energy-taking circuit; After the equivalent input resistance is regulated, the next sampling period is entered, the equivalent input signal is resampled, and the equivalent input power of the next sampling period is determined.
7. The method according to claim 1, wherein the method further comprises: After reaching the maximum power point, entering a dormant state; Before entering a dormant state, transmitting a driving signal obtained by current calculation to a voltage holding circuit; Latching and outputting a driving signal obtained by current calculation through a voltage holding circuit, so that the energy taking circuit continuously works within the allowable deviation range of the maximum power point; Wherein the voltage holding circuit receives the drive signal from a microcontroller.
8. The method of claim 7, wherein the method further comprises: Under the condition that a preset dormancy period is passed, a re-awakening state is entered; Based on the resampled equivalent input signal, it is determined whether to initiate a new round of maximum power point tracking.
9. A corona energy taking device for an extra-high voltage circuit, the device comprising: The electric energy signal acquisition module acquires corona electric energy signals through corona discharge electrodes arranged on the extra-high voltage circuit; the equivalent input determining module is used for carrying out transient high-voltage spike absorption and pulse noise filtering on the corona electric energy signal to obtain an equivalent input signal; The maximum power tracking module is used for carrying out maximum power tracking on the energy taking circuit based on the equivalent input signal so as to enable the energy taking power of the energy taking circuit to be converged to a maximum power point, wherein the energy taking circuit is a direct current conversion circuit with an adjustable characteristic of an equivalent input resistance; and the driving signal maintaining module is used for maintaining the current driving signal of the energy taking circuit under the condition that the energy taking power tracks to the maximum power point, so that the energy taking circuit continuously works within the allowable deviation range of the maximum power point.
10. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 8 when the computer program is executed.

Description

Corona energy-taking method, device and controller for extra-high voltage circuit Technical Field The application relates to the technical field of extra-high voltage line energy taking, in particular to a corona energy taking method, device and controller of an extra-high voltage line. Background In the technical field of ultra-high voltage transmission, real-time monitoring of the running state of a circuit is an important basis for guaranteeing the safety of a power grid and realizing transparent operation, and the aim is currently realized mainly by deploying various sensors on the circuit. The front-end sensors are powered stably and reliably, and become the precondition for supporting large-area deployment and long-term operation, and various technical paths including electromagnetic induction, thermoelectric conversion, energy collection, wireless energy transmission and the like are explored in the industry. With the rapid development of extra-high voltage direct current transmission engineering, the inherent characteristics of alternating electromagnetic fields are lacking along the line, so that the traditional non-invasive energy taking scheme faces fundamental challenges. The related technical scheme can not work effectively in a direct current environment, or has the problems of insufficient power output, poor environmental adaptability, additional supporting infrastructure and the like, and has obvious limitation in practical engineering application. In addition, the related art has difficulty in realizing effective corona energy taking in an extra-high voltage direct current circuit. Disclosure of Invention Based on the above, it is necessary to provide a corona energy taking method, a device and a controller for an extra-high voltage circuit, which can effectively realize corona energy taking on the extra-high voltage circuit. In a first aspect, the application provides a corona energy taking method for an extra-high voltage circuit, which comprises the following steps: Acquiring a corona electric energy signal through a corona discharge electrode arranged on an extra-high voltage circuit; performing transient high-voltage spike absorption and impulse noise filtering on the corona electric energy signal to obtain an equivalent input signal; Based on an equivalent input signal, carrying out maximum power tracking on the energy taking circuit, so that the energy taking power of the energy taking circuit is converged to a maximum power point, wherein the energy taking circuit is a direct current conversion circuit with an adjustable characteristic of an equivalent input resistance; Under the condition that the energy-taking power is tracked to the maximum power point, the current driving signal of the energy-taking circuit is maintained, so that the energy-taking circuit continuously works within the allowable deviation range of the maximum power point. In one embodiment, the transient high voltage spike absorption and pulse noise filtering are performed on the corona power signal to obtain an equivalent input signal, including: The corona electric energy signal is subjected to transient absorption through a high-voltage transient absorption unit; and processing the corona electric energy signal after transient absorption through a preset filter network to obtain an equivalent input signal. In one embodiment, maximum power tracking of the energy harvesting circuit based on the equivalent input signal includes: based on the equivalent input signal, obtaining the equivalent input power of the current sampling period; adjusting the tracking step length according to the equivalent input power of the current sampling period and the equivalent input power of the last sampling period; and carrying out maximum power tracking on the energy-taking circuit based on the adjusted tracking step length until the maximum power point is reached. In one embodiment, adjusting the tracking step according to the equivalent input power of the current sampling period and the equivalent input power of the last sampling period includes: Determining the variation between the equivalent input power of the current sampling period and the equivalent input power of the last sampling period; and adjusting the tracking step length according to the variation and at least one preset step length adjustment threshold. In one embodiment, adjusting the tracking step according to the change amount and at least one preset step adjustment threshold includes: adjusting the tracking step length under the condition that the absolute value of the variation is larger than a first preset threshold value; Reducing the tracking step length under the condition that the absolute value of the variation is smaller than or equal to a first preset threshold value and larger than a second preset threshold value; And under the condition that the absolute value of the variation is smaller than or equal to a second preset threshold value, keeping the t