Anti-corrosion device for high-voltage power overhead line tower steel

Abstract

The embodiment of the invention relates to an anti-corrosion device for high-voltage power overhead line tower steel. The anti-corrosion device comprises a power supply system, a DC-DC converter, a PWM amplification circuit, a control system, a single-phase bridge inverter circuit and an electrode, the power system is used for supplying power; the DC-DC converter is used for converting input and output voltages; the control system is used for generating two paths of complementary PWM (Pulse Width Modulation) waveforms with dead zones; the PWM amplifying circuit is used for amplifying the PWM waveform; the single-phase bridge inverter circuit is connected with the PWM amplification circuit and is used for generating bipolar pulses; the electrode comprises a first electrode and a second electrode, the first electrode is arranged in the top area of the tower, and the second electrode is arranged in the grounding body area of the tower and used for applying the bipolar pulse to the tower. According to the device, the surface of the tower is promoted to generate redox reaction by applying electric pulses, a compact protection layer is generated, and corrosion of steel is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal anti-corrosion, and in particular to an anti-corrosion device for steel materials of high-voltage power overhead line towers. Background Art

[0002] The metal structure of the high-voltage power overhead line tower is exposed to harsh environments for a long time and is easily corroded by factors such as atmosphere, humidity, and chemicals, resulting in corrosion damage. This corrosion will reduce the structural strength and durability of the tower, posing a threat to the normal operation of the power system.

[0003] The metal structure of the high-voltage power overhead line tower is usually treated with anti-corrosion methods such as galvanizing and anti-corrosion coating. However, in high-risk areas or harsh environments, the coating is severely damaged. If the maintenance is not timely or in place, the anti-corrosion effect is weakened, resulting in increased corrosion. Some anti-corrosion methods may gradually fail after long-term use and require more frequent maintenance or updates.

[0004] If stainless steel and other anti-corrosion materials are used to build high-voltage power overhead line towers, although they have good corrosion resistance, they will face high costs due to their huge size and will also increase the consumption of national steel resources. Generally speaking, the main structural material of high-voltage overhead line towers is ordinary steel, such as carbon steel or alloy steel. Therefore, its anti-corrosion work is particularly important. The existing technology still lacks simple, reliable, effective and long-lasting anti-corrosion technology. Summary of the invention

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

[0006] An embodiment of the present invention proposes an anti-corrosion device for steel of a high-voltage overhead power line tower, comprising a power supply system, a DC-DC converter, a PWM amplifier circuit, a control system, a single-phase bridge inverter circuit and an electrode; the power supply system is used to supply power to the anti-corrosion device; the DC-DC converter is connected to the power supply system for input and output voltage conversion; the control system is used to generate a dual-channel complementary PWM waveform with a dead zone; the PWM amplifier circuit is used to amplify the PWM waveform; the single-phase bridge inverter circuit is connected to the PWM amplifier circuit for generating a bipolar pulse; the electrode comprises a first electrode and a second electrode, the first electrode is arranged in the top area of ​​the tower, and the second electrode is arranged in the grounding area of ​​the tower, for applying the bipolar pulse to the tower.

[0007] Preferably, the power supply 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.

[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 comprises 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 tower steel.

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

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

[0017] The anti-corrosion device of the embodiment of the present invention applies bipolar pulses to induce an oxidation-reduction reaction on the steel surface of a high-voltage overhead power line tower to generate a dense protective layer. The protective layer can block the contact between the metal and the external environment and reduce the corrosion of the metal by substances such as oxygen and water. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0022] Figure 5It is a schematic diagram of a circuit for converting a 12V voltage of a lithium battery of an anti-corrosion device according to an embodiment of the present invention into an adjustable voltage of 12V to 60V.

[0023] Figure 6 It is a circuit schematic diagram of reducing the voltage of a 12V lithium battery of an anti-corrosion device in an embodiment of the present invention to 5V and 3.3V.

[0024] Figure 7 It is a schematic diagram of a PWM amplifying circuit of an anti-corrosion device according to an embodiment of the present invention.

[0025] Figure 8 It is the minimum system circuit of the STM32 single-chip microcomputer of the anti-corrosion device of the embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art will appreciate that the present invention is not limited to the accompanying drawings and the following embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.

[0027] The anti-corrosion device for high-voltage power overhead line tower steel of the embodiment of the present invention utilizes electric pulses to promote oxidation-reduction reaction on the surface of high-voltage power overhead line tower steel, generating a dense protective layer, thereby preventing further oxidation of the internal metal.

[0028] Reference Figure 1-8 An embodiment of the present invention provides an anti-corrosion device for steel of a high-voltage overhead power line tower, comprising a power supply system, a DC-DC converter, a PWM amplifier circuit, a control system, a single-phase bridge inverter circuit and an electrode.

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

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

[0031] The control system is used to generate a dual-channel complementary PWM waveform with a dead zone.

[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 comprises a first electrode and a second electrode, wherein the first electrode is arranged in the top area of ​​the pole tower, and the second electrode is arranged in the grounding area of ​​the pole tower, and is used to apply the bipolar pulse to the pole tower.

[0035] The power supply system is used to supply power to the anti-corrosion device. In one embodiment, the power supply system is arranged on the pole 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 storage battery. The photovoltaic power generation device and the wind turbine power generation device can generate electricity under harsh environmental conditions, and store the electric energy in the battery, and the lithium storage battery supplies power to the anti-corrosion device. Preferably, the rated power of the photovoltaic power generation device is 60W, the rated power of the wind turbine power generation device is 150W, and the capacity of the lithium storage battery is 80AH.

[0036] The DC-DC converter is used for input and output voltage conversion. 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. In one embodiment, the DC-DC converter converts the 12V voltage of the storage lithium battery to an adjustable 12V to 60V, and steps down the 12V to 5V and 3.3V. Preferably, 60V, 48V, 12V, 5V and 3.3V voltages are obtained through the DC-DC converter. The DC-DC converter is used to power the PWM amplifier circuit, the control system, the single-phase bridge inverter circuit, the switch trigger control circuit, the remote control remote controller, and the 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 to 60V. The input voltage range is 8.5V to 60V, the input current is 0 to 15A; the output voltage is 12V to 60V, and the output current is 0 to 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 5V power supply is obtained by stepping down to power some peripherals of the microcontroller (such as ADC sampling circuit module, Bluetooth module, infrared receiving module, etc.). At the same time, it can be used as an input for stepping down to obtain 3.3V power supply as the power supply for the microcontroller.

[0039] The control system is used to generate a dual-channel complementary PWM waveform with a dead zone. Preferably, the control system is a single-chip control system, such as an STM32 single-chip microcomputer. Figure 8 It is the minimum system circuit of the STM32 single-chip microcomputer of the anti-corrosion device of the embodiment of the present 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 on and off.

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

[0042] The electrodes include a first electrode and a second electrode, wherein the first electrode is disposed at the top area of ​​the pole tower, and the second electrode is disposed at the grounding area of ​​the pole tower, for applying the bipolar pulse to the pole tower. Preferably, the electrodes are platinum electrodes, 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 constructed in an H shape to form a bridge inverter circuit. The four drive modules are simultaneously connected to the PWM amplifier circuit signal; the PWM waveform is amplified and loaded on the gate and emitter of the IGBT of the single-phase bridge inverter circuit to control the IGBT to turn on and off, thereby generating a bipolar pulse with adjustable amplitude, frequency, and duty cycle; by setting a first electrode and a second electrode at the top and bottom grounding bodies of the tower, the bipolar pulse is regularly applied to the tower steel to promote the redox reaction on the tower steel surface. The IGBT is continuously turned on and off, and the single-phase bridge inverter circuit works and outputs a DC bipolar pulse. The pulse signal passes through the first electrode and the second electrode, so that the electrode action area covers the tower body. When a bipolar pulse is applied, the positive polarity pulse will promote an oxidation reaction on the metal surface to form an oxide layer; the negative polarity pulse will promote a reduction reaction on the metal surface to reduce the oxide layer. By repeatedly applying positive and negative pulses, a dense protective layer will be formed on the metal surface. This protective layer can block the contact between the metal and the external environment and reduce 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 according to 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 according to 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 according to the characteristics of the metal material and the required anti-corrosion effect. The above-mentioned pulse parameters can be adjusted by the single-chip microcomputer to adjust the frequency, duty cycle of the output waveform and the power supply voltage of the single-phase bridge inverter circuit, and the IGBT is driven after amplification by the PWM amplifier circuit, thereby changing the frequency, duty cycle and amplitude of the bipolar pulse to achieve precise regulation.

[0045] Preferably, the anti-corrosion device further comprises a potential and current monitoring circuit, which is connected to the control system and is 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 and a clamp-type 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 according to 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 tower steel surface to measure the potential value on the tower steel surface, and uses a clamp-type current sensor to monitor the current on the tower steel surface.

[0046] Preferably, the anti-corrosion device further comprises a remote control remote controller, which is connected to the control system and is used for remotely controlling the anti-corrosion device. The power supply system supplies power to the remote control remote controller via the DC-DC converter. Through the remote control remote controller, appropriate adjustments can be made on the ground according to the real-time feedback of the working status from the monitoring equipment.

[0047] Figure 2 The bipolar pulse closed-loop control process of the anti-corrosion device of the embodiment of the present invention is represented. When the weather conditions are bad, such as rain, fog and other hot and humid weather, the single-chip microcomputer starts, initializes, and continuously outputs PWM pulse signals. The single-chip microcomputer reads the potential and current from the potential and current monitoring circuit, and compares whether the potential and current exceed the set value. The specific potential and current values ​​will vary according to the specific metal, environmental conditions and corrosion process. Generally, the stronger the metal activity, the more humid the climate or the heavy rain when the weather is hot, and the salt fog weather in coastal areas accelerates the corrosion process, the lower the electrode potential. Generally speaking, the electrode potential during metal corrosion will vary in the range of a few millivolts to hundreds of millivolts. The value of the current depends on factors such as the corrosion rate and the electrochemical activity of the metal. According to the comparison results, the embodiment of the present invention adjusts the amplitude, duty cycle and frequency of the bipolar pulse. When the weather conditions are more friendly, the pulse amplitude and duty cycle can be reduced, and the pulse frequency can be adjusted appropriately.

[0048] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-corrosion device for steel materials of high-voltage overhead power line towers, characterized in that: It includes 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 is used to supply power to the anti-corrosion device; The DC-DC converter is connected to the power supply system for input and output voltage conversion; The control system is used to generate a dual-channel complementary PWM waveform with a dead zone; 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 comprises a first electrode and a second electrode, wherein the first electrode is arranged in the top area of ​​the pole tower, and the second electrode is arranged in the grounding area of ​​the pole tower, and is used to apply the bipolar pulse to the pole tower.

2. The anti-corrosion device according to claim 1, characterized in that: The power supply 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 according to claim 1, characterized in that: 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.

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

5. The anti-corrosion device according to claim 1, characterized in that: The single-phase bridge inverter circuit is connected to the PWM amplifier circuit and is used to generate bipolar pulses.

6. The anti-corrosion device according to claim 5, characterized in that: The amplitude, frequency and duty cycle of the bipolar pulse are all adjustable.

7. The anti-corrosion device according to claim 1, characterized in that: The first electrode is a first platinum electrode, and the second electrode is a second platinum electrode.

8. The anti-corrosion device according to 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.

9. The anti-corrosion device according to 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 tower steel.

10. The anti-corrosion device according to claim 1, characterized in that: The anti-corrosion device also includes a remote control remote controller, which is connected to the control system and is used for remotely controlling the anti-corrosion device.

Images