A corrosion protection device for steel poles and towers of high-voltage power lines.

Abstract

This invention relates to an anti-corrosion device for steel poles of high-voltage overhead power lines, comprising a power supply system, a DC-DC converter, a PWM amplifier circuit, a control system, a single-phase bridge inverter circuit, and electrodes. The power supply system provides power; the DC-DC converter converts the input and output voltages; the control system generates a dual-path complementary PWM waveform with dead time; the PWM amplifier circuit amplifies the PWM waveform; the single-phase bridge inverter circuit, connected to the PWM amplifier circuit, generates bipolar pulses; the electrodes include a first electrode and a second electrode, the first electrode being disposed at the top region of the pole, and the second electrode being disposed at the grounding region of the pole, for applying the bipolar pulses to the pole. This device induces a redox reaction on the pole surface by applying electrical pulses, generating a dense protective layer and reducing steel corrosion.

Description

Technical Field

[0001] This invention relates to the field of metal corrosion protection technology, specifically to a corrosion protection device for steel poles and towers of high-voltage power overhead lines. Background Technology

[0002] The metal structures of high-voltage power line towers are exposed to harsh environments for extended periods, making them susceptible to corrosion from atmospheric conditions, humidity, and chemicals. This corrosion reduces the structural strength and durability of the towers, threatening the normal operation of the power system.

[0003] The metal structures of high-voltage power line towers are typically protected against corrosion through methods such as galvanizing and applying anti-corrosion coatings. However, in high-risk areas or harsh environments, the coatings are more susceptible to damage. If maintenance is not timely or adequate, the anti-corrosion effect weakens, leading to accelerated corrosion. Some anti-corrosion methods may gradually fail after prolonged use, requiring more frequent maintenance or replacement.

[0004] While stainless steel and other corrosion-resistant materials offer excellent corrosion resistance, their massive size would result in high costs and exacerbate the nation's steel resource consumption. Generally, the main structural material for high-voltage overhead line towers is ordinary steel, such as carbon steel or alloy steel. Therefore, corrosion prevention is crucial, and current technology still lacks simple, reliable, effective, and durable anti-corrosion techniques. Summary of the Invention

[0005] In view of this, the present invention proposes an anti-corrosion device for steel poles and towers of high-voltage power overhead lines to solve the above-mentioned technical problems.

[0006] This invention provides an anti-corrosion device for steel poles of high-voltage power overhead lines, comprising a power supply system, a DC-DC converter, a PWM amplifier circuit, a control system, a single-phase bridge inverter circuit, and electrodes. The power supply system supplies power to the anti-corrosion device. The DC-DC converter is connected to the power supply system and is used for input-output voltage conversion. The control system generates a dual-path complementary PWM waveform with dead time. The PWM amplifier circuit amplifies the PWM waveform. The single-phase bridge inverter circuit is connected to the PWM amplifier circuit and generates bipolar pulses. The electrodes include a first electrode and a second electrode. The first electrode is disposed at the top region of the pole, and the second electrode is disposed at the grounding region of the pole, for applying the bipolar pulses to the pole.

[0007] Preferably, the power system includes a power generation device and an energy storage device, wherein the power generation device includes a photovoltaic power generation device and a wind turbine power generation device.

[0008] Preferably, the DC-DC converter is connected to the power supply system, and the power supply system supplies power to the PWM amplifier circuit, the control system, and the single-phase bridge inverter circuit through the DC-DC converter.

[0009] Preferably, the control system is a single-chip microcomputer control system.

[0010] Preferably, the single-phase bridge inverter circuit is connected to the PWM amplifier circuit to generate bipolar pulses.

[0011] Preferably, the amplitude, frequency, and duty cycle of the bipolar pulse are all adjustable.

[0012] Preferably, the first electrode is a first platinum electrode and the second electrode is a second platinum electrode.

[0013] Preferably, the frequency range of the bipolar pulse is 1KHz to 60KHz, the duty cycle of the bipolar pulse is between 10% and 90%, and the amplitude range of the bipolar pulse is ±12V to ±60V.

[0014] Preferably, the anti-corrosion device further includes a potential and current monitoring circuit, which is connected to the control system and is used to monitor the potential and current on the surface of the steel pole.

[0015] Preferably, the anti-corrosion device further includes a remote control controller, which is connected to the control system and used to remotely control the anti-corrosion device.

[0016] The beneficial effects of the embodiments of the present invention are:

[0017] The anti-corrosion device of this invention induces an oxidation-reduction reaction on the surface of the steel of high-voltage power overhead line towers by applying bipolar pulses, generating a dense protective layer. This protective layer can block the metal from contacting the external environment and reduce the corrosion of the metal by substances such as oxygen and water. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-corrosion device composition according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the bipolar pulse closed-loop control process of the corrosion protection device according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram illustrating the bipolar pulse generation principle of the corrosion protection device according to an embodiment of the present invention.

[0021] Figure 4 This is a simulation diagram of the bipolar pulse of the anti-corrosion device according to an embodiment of the present invention.

[0022] Figure 5This is a schematic diagram of the circuit principle for the corrosion protection device of the present invention, which converts the 12V voltage of the storage lithium battery to an adjustable voltage of 12V~60V.

[0023] Figure 6 This is a circuit diagram of the corrosion protection device of the present invention, showing the 12V lithium battery voltage reduction to 5V and 3.3V.

[0024] Figure 7 This is a schematic diagram of the PWM amplifier circuit of the corrosion protection device according to an embodiment of the present invention.

[0025] Figure 8 This is the STM32 microcontroller minimum system circuit of the anti-corrosion device in this embodiment of the invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, those skilled in the art will understand that this invention is not limited to the accompanying drawings and the following embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] The anti-corrosion device for steel poles and towers of high-voltage power lines in this embodiment of the invention utilizes electrical pulses to promote an oxidation-reduction reaction on the surface of the steel poles and towers of high-voltage power lines, generating a dense protective layer, thereby preventing further oxidation of the internal metal.

[0028] Reference Figure 1-8 This invention proposes an anti-corrosion device for steel poles of high-voltage power overhead lines, comprising a power supply system, a DC-DC converter, a PWM amplifier circuit, a control system, a single-phase bridge inverter circuit, and electrodes.

[0029] The power supply system is used to supply power to the corrosion protection device.

[0030] The DC-DC converter is connected to the power supply system and is used for input-output voltage conversion.

[0031] The control system is used to generate dual-channel complementary PWM waveforms with dead time.

[0032] The PWM amplifier circuit is used to amplify the PWM waveform.

[0033] The single-phase bridge inverter circuit is connected to the PWM amplifier circuit and is used to generate bipolar pulses.

[0034] The electrode includes a first electrode and a second electrode. The first electrode is disposed in the top region of the tower, and the second electrode is disposed in the grounding region of the tower, for applying the bipolar pulse to the tower.

[0035] The power system is used to supply power to the corrosion protection device. In one embodiment, the power system is installed on the tower and includes a power generation device and an energy storage device. Preferably, the power generation device includes a photovoltaic power generation device and a wind turbine power generation device. Preferably, the energy storage device is a lithium-ion battery. The photovoltaic power generation device and the wind turbine power generation device can generate electricity under harsh environmental conditions and store the electrical energy in the battery, which then supplies power to the corrosion protection device. Preferably, the photovoltaic power generation device has a rated power of 60W, the wind turbine power generation device has a rated power of 150W, and the lithium-ion battery has a capacity of 80AH.

[0036] The DC-DC converter is used for input-output voltage conversion. The DC-DC converter is connected to the power supply system, which supplies power to the PWM amplifier circuit, control system, and single-phase bridge inverter circuit via the DC-DC converter. In one embodiment, the DC-DC converter converts the 12V voltage of the lithium battery to an adjustable 12V~60V, and steps down the 12V to 5V and 3.3V. Preferably, the DC-DC converter provides voltages of 60V, 48V, 12V, 5V, and 3.3V. The DC-DC converter supplies power to the PWM amplifier circuit, control system, single-phase bridge inverter circuit, switch trigger control circuit, remote control, and potential and current monitoring circuit.

[0037] like Figure 5 As shown, the DC-DC converter converts the 12V voltage of the lithium battery to an adjustable 12V~60V. The input voltage range is 8.5V~60V, and the input current is 0~15A; the output voltage is 12V~60V, and the output current is 0~12A.

[0038] like Figure 6 As shown, the DC-DC converter steps down the 12V voltage of the lithium battery to 5V and 3.3V circuits. The 12V power supply is taken from the lithium battery, and the step-down to obtain 5V power supplies some peripherals of the microcontroller (such as the ADC sampling circuit module, Bluetooth module, infrared receiving module, etc.). At the same time, it can also be used as the input for stepping down to obtain 3.3V power, which is used as the power supply for the microcontroller.

[0039] The control system is used to generate dual-channel complementary PWM waveforms with dead time. Preferably, the control system is a microcontroller control system, such as an STM32 microcontroller. Figure 8 This is the STM32 microcontroller minimum system circuit of the anti-corrosion device in this embodiment of the invention.

[0040] The PWM amplifier circuit is used to amplify the PWM waveform. The PWM amplifier circuit is as follows: Figure 7As shown, the PWM waveform signal generated by the control system is amplified and used to drive the IGBT of the single-phase bridge inverter circuit, thereby controlling its turn-on and turn-off.

[0041] The single-phase bridge inverter circuit is connected to the PWM amplifier circuit and is used to generate bipolar pulses. Preferably, the amplitude, frequency, and duty cycle of the bipolar pulses are all adjustable.

[0042] The electrode includes a first electrode and a second electrode. The first electrode is disposed at the top region of the tower, and the second electrode is disposed at the grounding region of the tower, for applying the bipolar pulse to the tower. Preferably, the electrode is a platinum electrode, including a first platinum electrode and a second platinum electrode.

[0043] like Figure 3 As shown, the single-phase bridge inverter circuit includes four drive modules and four IGBTs. The four IGBTs are configured in an H-shape to form a bridge inverter circuit. All four drive modules are simultaneously connected to a PWM amplifier circuit signal. The PWM waveform is amplified and applied to the gate and emitter of the IGBTs in the single-phase bridge inverter circuit, controlling the IGBTs to turn on and off, generating bipolar pulses with adjustable amplitude, frequency, and duty cycle. By setting a first electrode and a second electrode at the grounding electrode at the top and bottom of the tower, the bipolar pulses are periodically applied to the tower steel, causing an oxidation-reduction reaction on the steel surface. With the IGBTs continuously turning on and off, the single-phase bridge inverter circuit operates and outputs DC bipolar pulses. These pulse signals pass through the first and second electrodes, ensuring that the electrode action area covers the entire tower body. When a bipolar pulse is applied, a positive pulse induces an oxidation reaction on the metal surface, forming an oxide layer; a negative pulse induces a reduction reaction, reducing the oxide layer. By repeatedly applying positive and negative pulses, a dense protective layer forms on the metal surface. This protective layer can prevent the metal from coming into contact with the external environment, reducing the corrosion of the metal by substances such as oxygen and water.

[0044] Preferably, the frequency range of the bipolar pulse is 1kHz to 60kHz. The frequency is selected based on the required anti-corrosion effect and the actual application environment. Preferably, the duty cycle of the bipolar pulse is between 10% and 90%. The duty cycle is selected based on the corrosion condition of the steel surface and the required anti-corrosion effect. Preferably, the amplitude range of the bipolar pulse is ±12V to ±60V. The amplitude is selected within this range based on the characteristics of the metal material and the required anti-corrosion effect. The above pulse parameters can be adjusted by a microcontroller using the output waveform frequency, duty cycle, and single-phase bridge inverter circuit power supply voltage. After amplification by a PWM amplifier circuit, the output waveform drives the IGBT, thereby changing the frequency, duty cycle, and amplitude of the bipolar pulse to achieve precise adjustment.

[0045] Preferably, the anti-corrosion device further includes a potential and current monitoring circuit, which is connected to the control system and used to monitor the electrode potential and current on the surface of the tower steel. The potential and current monitoring circuit, such as a reference electrode potentiometer or a clip-on current sensor, continuously monitors the potential and current on the surface of the tower steel and adjusts the amplitude, duty cycle, and frequency of the bipolar pulse based on the monitoring results to ensure the stability of the pulse parameters and the reliability of the anti-corrosion effect. In one embodiment, the potential and current monitoring circuit uses a reference electrode potentiometer connected to the reference electrode and the surface of the tower steel to measure the potential value of the tower steel surface, and uses a clip-on current sensor to monitor the current on the surface of the tower steel.

[0046] Preferably, the corrosion protection device further includes a remote control controller, which is connected to the control system for remotely controlling the corrosion protection device. The power system supplies power to the remote control controller via the DC-DC converter. Using the remote control controller, appropriate adjustments can be made on the ground based on real-time feedback from monitoring equipment regarding the operating status.

[0047] Figure 2 This invention describes the bipolar pulse closed-loop control flow of the corrosion protection device according to an embodiment of the invention. When weather conditions are severe, such as rain, heavy fog, or other hot and humid weather, the microcontroller starts, initializes, and continuously outputs PWM pulse signals. The microcontroller reads the potential and current from the potential and current monitoring circuit and compares whether the potential and current exceed the set values. The specific potential and current values ​​will vary depending on the specific metal, environmental conditions, and corrosion process. Generally, the stronger the metal's activity, the more humid the climate, or the hot weather with heavy rain, as well as the salt spray weather in coastal areas that accelerates the corrosion process, the lower the electrode potential. Generally, the electrode potential during metal corrosion will vary in the range of a few millivolts to several hundred millivolts. The current value depends on factors such as the corrosion rate and the electrochemical activity of the metal. Based on the comparison results, this embodiment of the invention adjusts the amplitude, duty cycle, and frequency of the bipolar pulse. When weather conditions are more favorable, the pulse amplitude and duty cycle can be reduced, and the pulse frequency can be adjusted appropriately.

[0048] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion protection device for steel poles and towers of high-voltage power overhead lines, characterized in that, This includes the power supply system, DC-DC converter, PWM amplifier circuit, control system, single-phase bridge inverter circuit, and electrodes; The power supply system is used to supply power to the corrosion protection device; The DC-DC converter is connected to the power supply system and is used for input-output voltage conversion; The control system is used to generate dual-channel complementary PWM waveforms with dead time; The PWM amplifier circuit is used to amplify the PWM waveform; The single-phase bridge inverter circuit is connected to the PWM amplifier circuit and is used to generate bipolar pulses. The electrode includes a first electrode and a second electrode. The first electrode is disposed in the top region of the tower, and the second electrode is disposed in the grounding region of the tower, for applying the bipolar pulse to the tower.

2. The anti-corrosion device as described in claim 1, characterized in that, The power system includes a power generation device and an energy storage device, and the power generation device includes a photovoltaic power generation device and a wind turbine power generation device.

3. The anti-corrosion device as described in claim 1, characterized in that, The DC-DC converter is connected to the power supply system, which supplies power to the PWM amplifier circuit, the control system, and the single-phase bridge inverter circuit through the DC-DC converter.

4. The anti-corrosion device as described in claim 1, characterized in that, The control system is a single-chip microcomputer control system.

5. The anti-corrosion device as described in claim 1, characterized in that, The amplitude, frequency, and duty cycle of the bipolar pulse are all adjustable.

6. The anti-corrosion device as described in claim 1, characterized in that, The first electrode is a first platinum electrode, and the second electrode is a second platinum electrode.

7. The anti-corrosion device as described in claim 1, characterized in that, The frequency range of the bipolar pulse is 1kHz to 60kHz, the duty cycle of the bipolar pulse is between 10% and 90%, and the amplitude range of the bipolar pulse is ±12V to ±60V.

8. The anti-corrosion device as described in claim 1, characterized in that, The anti-corrosion device also includes a potential and current monitoring circuit, which is connected to the control system and is used to monitor the potential and current on the surface of the steel of the tower.

9. The anti-corrosion device as described in claim 1, characterized in that, The corrosion protection device also includes a remote control controller, which is connected to the control system and used to remotely control the corrosion protection device.

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