Special impressed current cathodic protection power supply for offshore wind power with ultra-wide incoming line voltage

Abstract

The utility model discloses an impressed current cathodic protection power supply special for offshore wind power with ultra-wide incoming line voltage, which relates to the technical field of jacket protection and comprises a main circuit system and a control system electrically connected with the main circuit system and used for controlling the main circuit system to work. The main circuit system comprises an AC-DC inlet wire voltage regulation module and a DC-DC voltage regulation module which are connected in sequence, the AC-DC inlet wire voltage regulation module comprises an inlet wire filtering unit and an inlet wire voltage regulation rectification unit, the AC-DC inlet wire voltage regulation module filters input three-phase alternating current, realizes voltage regulation and rectification based on a silicon controlled rectifier rectification circuit, outputs direct current adapting to wide fluctuation of the offshore wind turbine generator set, and outputs the direct current to the DC-DC voltage regulation module. The direct current is sequentially subjected to direct current filtering, high-frequency inversion, voltage regulation, synchronous rectification, output filtering and switch control through the DC-DC voltage regulation module, and protection current is output to an anode bar to realize cathode protection of the jacket; according to the utility model, the adaptability of the power supply to wind power wide fluctuation voltage can be improved, and the device is especially suitable for offshore wind power impressed current cathodic protection scenes.

Description

Technical Field

[0001] This utility model relates to the field of jacket protection technology, and in particular to an impressed current cathodic protection power supply for offshore wind power with an ultra-wide input voltage. Background Technology

[0002] Offshore wind energy is an important clean energy source, and my country's wind power industry is experiencing rapid growth. Currently, due to the superior bearing capacity and convenient construction of pile foundations, offshore wind power projects generally use large-diameter monopile foundations. However, steel pipe pile foundations are susceptible to seawater corrosion, leading to a decrease in their bearing capacity. Currently, commonly used cathodic protection methods for corrosion prevention mainly include sacrificial anode method and impressed current method. The sacrificial anode method mainly uses alloy materials such as aluminum, zinc, and magnesium connected to the steel pipe pile. The current generated by the dissolution of the anode causes polarization on the surface of the steel pipe pile. However, the main disadvantages of this method are its high susceptibility to electrolyte resistivity, low protective current, easy consumption, and low sustainability.

[0003] The impressed current method requires an external DC power supply. The negative terminal of the power supply is connected to the structure being protected, and the positive terminal is connected to the auxiliary anode. The advantage of this method is that it is less affected by the resistivity of the electrolyte, the current is controllable, and the current output is large. This method has been widely used in various engineering fields.

[0004] Existing impressed current cathodic protection methods for large-diameter monopile foundations in offshore wind power typically rely on external 380V or 400V AC power. However, wind turbines generate 690V three-phase AC power, and the impressed current method cannot directly utilize the electrical energy generated by the wind turbine. This necessitates the additional configuration of a large-capacity step-down transformer, increasing power losses, equipment costs, and structural complexity, thus limiting the effectiveness of the impressed current method in offshore wind power projects. Utility Model Content

[0005] This invention provides an impressed current cathodic protection power supply for offshore wind power with an ultra-wide input voltage range, in order to overcome the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An ultra-wide input voltage offshore wind power-specific impressed current cathodic protection power supply, connected to the three-phase AC power supply and anode rod of the wind turbine, includes: a main circuit system and a control system electrically connected to the main circuit system for controlling the operation of the main circuit system;

[0008] The main circuit system includes an AC-DC input voltage regulator module and a DC-DC voltage regulator module; the input terminal of the AC-DC input voltage regulator module is connected to the three-phase AC power supply of the wind turbine, the output terminal is connected to the input terminal of the DC-DC voltage regulator module, and the output terminal of the DC-DC voltage regulator module is connected to the anode rod.

[0009] The AC-DC input voltage regulation module includes an input filter unit and an input voltage regulation and rectification unit connected in sequence.

[0010] The input filtering unit is used to filter the ultra-wide three-phase AC power input to the wind turbine through an input filtering circuit equipped with multiple inductors and capacitors, and output the filtered three-phase AC power; the input voltage regulating and rectifying unit is used to regulate and rectify the filtered three-phase AC power through an input voltage regulating and rectifying circuit equipped with thyristors, and output DC power with a wide range of voltage regulation to meet the output requirements of the wind turbine.

[0011] The DC-DC voltage regulation module includes a DC filter unit, a high-frequency inverter unit, a high-frequency voltage regulation unit, an output rectifier unit, an output filter unit, and an output switch unit connected in sequence.

[0012] The DC filter unit is used to filter the DC power and output the filtered DC power; the high-frequency inverter unit is used to invert the filtered DC power into AC power; the high-frequency voltage regulation unit is used to regulate the AC power to a set value; the output rectifier unit is used to convert the input AC power into pulsating DC power through a synchronous rectifier circuit with multiple MOS transistors; the output filter unit is used to filter the pulsating DC power and output the final filtered DC power; the output switch unit is used to output the final filtered DC power to the anode rod.

[0013] Furthermore, the input filter circuit includes a first inductor to a third inductor and a first capacitor to a sixth capacitor;

[0014] One end of the first inductor and one end of the first capacitor are connected to phase A of the three-phase AC power supply, and the other end of the first inductor is connected to one end of the fourth capacitor; one end of the second inductor and one end of the second capacitor are connected to phase B of the three-phase AC power supply, and the other end of the second inductor is connected to one end of the fifth capacitor; one end of the third inductor and one end of the third capacitor are connected to phase C of the three-phase AC power supply, and the other end of the third inductor is connected to one end of the sixth capacitor; the other ends of the first capacitor to the third capacitor are connected to the same terminal, and the fourth capacitor to the sixth capacitor are grounded.

[0015] Furthermore, the input voltage regulation rectifier circuit includes: a first thyristor to a sixth thyristor, a first resistor, a fourth inductor, and a seventh capacitor;

[0016] The anode of the first thyristor is connected to the other end of the first inductor and the cathode of the second thyristor; the anode of the third thyristor is connected to the other end of the second inductor and the cathode of the fourth thyristor; the anode of the fifth thyristor is connected to the other end of the third inductor and the cathode of the sixth thyristor; the cathodes of the first, third, and fifth thyristors are all connected to one end of the fourth inductor; the anodes of the second, fourth, and sixth thyristors are all connected to one end of the seventh capacitor; the other end of the fourth inductor is connected to the other end of the seventh capacitor; and the two ends of the seventh capacitor are connected to the two ends of the first resistor.

[0017] Furthermore, the high-frequency inverter unit includes: a first MOSFET to a fourth MOSFET and a high-frequency capacitor;

[0018] The drain of the first MOSFET is connected to the drain of the second MOSFET, and the source is connected to the drain of the third MOSFET; the source of the second MOSFET is connected to the drain of the fourth MOSFET and one end of the high-frequency capacitor; the source of the third MOSFET is connected to the source of the fourth MOSFET.

[0019] Furthermore, the output rectifier unit includes a first synchronous rectifier circuit and a second synchronous rectifier circuit;

[0020] The first synchronous rectification circuit includes a fifth MOSFET, a sixth MOSFET, a fifth inductor, and a sixth inductor; the second synchronous rectification circuit includes a seventh MOSFET, an eighth MOSFET, a seventh inductor, and an eighth inductor.

[0021] The drains of the fifth and seventh MOSFETs are connected to one end of the fifth and seventh inductors, respectively. The sources of the fifth and seventh MOSFETs are connected to the drains of the sixth and eighth MOSFETs, respectively. The sources of the sixth and eighth MOSFETs are connected to one end of the sixth and eighth inductors, respectively. The other ends of the fifth to eighth inductors are all connected to one end of the filter capacitor in the output filter unit. The sources of the fifth and seventh MOSFETs and the drains of the sixth and eighth MOSFETs are connected to the other end of the filter capacitor in the output filter unit.

[0022] Furthermore, the high-frequency voltage regulation unit includes: a resonant inductor, a first high-frequency transformer, and a second high-frequency transformer;

[0023] One end of the resonant inductor is connected to the other end of the high-frequency capacitor, and the other end of the resonant inductor is connected to the input side of the first high-frequency transformer and the second high-frequency transformer respectively; the output side of the first high-frequency transformer is connected to the drain of the fifth MOS transistor and the source of the sixth MOS transistor respectively; the output side of the second high-frequency transformer is connected to the drain of the seventh MOS transistor and the source of the eighth MOS transistor respectively.

[0024] Beneficial effects: This utility model provides an impressed current cathodic protection power supply for offshore wind power with an ultra-wide input voltage range, which has the following advantages:

[0025] 1. An input line filter circuit with multiple inductors and capacitors is set up to filter the input three-phase AC power, which can filter the 690V three-phase AC power input to the wind turbine and ensure the filtering effect.

[0026] 2. By replacing the original diodes with thyristors in the input voltage regulation module, a thyristor rectifier bridge is formed. This allows for dynamic adjustment of the input voltage through phase-controlled voltage regulation of the thyristors. This enables the equipment to be directly connected to the ultra-wide range three-phase AC power output from offshore wind turbines (e.g., 300V). (690V), eliminating the need for a large-capacity power frequency step-down transformer; compared to traditional solutions, it not only significantly improves the adaptability of the power supply to the wide voltage fluctuations of wind power, but also reduces system size, losses and costs, making it particularly suitable for offshore wind power impressed current cathodic protection scenarios with severe voltage fluctuations and long transmission distances. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A block diagram of an impressed current cathodic protection power supply for offshore wind power with an ultra-wide input voltage, provided by this utility model;

[0029] Figure 2 The overall circuit design diagram of the AC-DC input voltage regulating module provided by this utility model;

[0030] Figure 3 The diagram shows the DC voltage output when the phase voltage is 297V.

[0031] Figure 4 The diagram shows the DC voltage output when the phase voltage is 398V.

[0032] Figure 5 The DC voltage output result when the phase voltage is 490V;

[0033] Figure 6 This is the overall circuit design diagram of the DC-DC voltage regulation module provided by this utility model;

[0034] Figure 7This is a diagram showing the output results of the DC-DC voltage regulation module in the first embodiment;

[0035] Figure 8 This is a diagram showing the output results of the DC-DC voltage regulation module in the second embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] This embodiment provides an offshore wind power-specific impressed current cathodic protection power supply with an ultra-wide input voltage range, which is connected to a three-phase AC power supply and an anode rod, such as... Figure 1 As shown, it includes a main circuit system and a control system electrically connected to the main circuit system for controlling the operation of the main circuit system;

[0038] The main circuit system includes an AC-DC input voltage regulator module and a DC-DC voltage regulator module; the input terminal of the AC-DC input voltage regulator module is connected to the three-phase AC power supply of the wind turbine, the output terminal is connected to the input terminal of the DC-DC voltage regulator module, and the output terminal of the DC-DC voltage regulator module is connected to the anode rod.

[0039] The AC-DC input voltage regulation module includes an input filter unit and an input voltage regulation and rectification unit connected in sequence.

[0040] The input filtering unit is used to filter the ultra-wide three-phase AC power input to the wind turbine through an input filtering circuit equipped with multiple inductors and capacitors, and output the filtered three-phase AC power; the input voltage regulating and rectifying unit is used to regulate and rectify the filtered three-phase AC power through an input voltage regulating and rectifying circuit equipped with thyristors, and output DC power with a wide range of voltage regulation to meet the output requirements of the wind turbine.

[0041] The DC-DC voltage regulation module includes a DC filter unit, a high-frequency inverter unit, a high-frequency voltage regulation unit, an output rectifier unit, an output filter unit, and an output switch unit connected in sequence.

[0042] The DC filter unit is used to filter the DC power and output the filtered DC power; the high-frequency inverter unit is used to invert the filtered DC power into AC power; the high-frequency voltage regulation unit is used to regulate the AC power to a set value; the output rectifier unit is used to convert the input AC power into pulsating DC power through a synchronous rectifier circuit with multiple MOS transistors; the output filter unit is used to filter the pulsating DC power and output the final filtered DC power; the output switch unit is used to output the final filtered DC power to the anode rod.

[0043] Specifically, such as Figure 1 As shown, the control system is used to set voltage and current values ​​according to actual needs, detect the three-phase voltage and frequency output by the input filter unit, the DC bus voltage at the output of the DC voltage boost unit, the current and voltage on the primary and secondary sides of the transformer in the high-frequency voltage regulation unit, and the output voltage and current at the output of the output filter unit. It triggers the thyristors in the input voltage regulation unit to perform rectification and voltage regulation through a trigger, and drives the high-frequency inverter unit circuit and the output rectifier unit circuit through a drive circuit to perform voltage and current conversion and regulation in the circuit.

[0044] The control system is also used to analyze the output data of each unit to determine whether the equipment has malfunctioned.

[0045] In this invention, the control system is a digital centralized control platform with a high-performance DSP / MCU as its core. Sampling, driving, and judgment are all conventional technical means in this field, and the specific circuit structure will not be described in detail.

[0046] This invention directly uses the 690V three-phase AC power output from the wind turbine, saving users the need for a large-capacity three-phase transformer to convert 690V to 380V. Because it directly draws three-phase power from the wind turbine, the equipment can be put into operation in the early stages of wind power commissioning, protecting the wind turbine foundation earlier and extending its service life.

[0047] In a specific embodiment, such as Figure 2 As shown, the input line filtering unit uses an input line filtering circuit for filtering; the input line filtering circuit includes a first inductor L1 to a third inductor L3 and a first capacitor C1 to a sixth capacitor C6;

[0048] One end of the first inductor and one end of the first capacitor are connected to phase A of the three-phase AC power supply, and the other end of the first inductor is connected to one end of the fourth capacitor; one end of the second inductor and one end of the second capacitor are connected to phase B of the three-phase AC power supply, and the other end of the second inductor is connected to one end of the fifth capacitor; one end of the third inductor and one end of the third capacitor are connected to phase C of the three-phase AC power supply, and the other end of the third inductor is connected to one end of the sixth capacitor; the other ends of the first capacitor to the third capacitor are connected to the same terminal, and the fourth capacitor to the sixth capacitor are grounded.

[0049] In this embodiment, the input line filtering unit is used to suppress or eliminate conducted interference and radio interference generated by the high-frequency power supply; by setting multiple inductors and capacitors, it can directly filter the input three-phase AC power, and can filter the 690V three-phase AC power input to the wind turbine, ensuring the filtering effect.

[0050] In a specific embodiment, such as Figure 2 As shown, the input voltage regulation and rectification unit performs voltage regulation and rectification through the input voltage regulation and rectification circuit: first thyristor T1 to sixth thyristor T6, first resistor R1, fourth inductor L4 and seventh capacitor C7;

[0051] The anode of the first thyristor is connected to the other end of the first inductor and the cathode of the second thyristor; the anode of the third thyristor is connected to the other end of the second inductor and the cathode of the fourth thyristor; the anode of the fifth thyristor is connected to the other end of the third inductor and the cathode of the sixth thyristor; the cathodes of the first, third, and fifth thyristors are all connected to one end of the fourth inductor; the anodes of the second, fourth, and sixth thyristors are all connected to one end of the seventh capacitor; the other end of the fourth inductor is connected to the other end of the seventh capacitor; and the two ends of the seventh capacitor are connected to the two ends of the first resistor.

[0052] In a three-phase controlled rectifier circuit, a thyristor (SCR) will only be triggered and conduct when a trigger pulse is applied to the control electrode during the positive half-cycle of a sinusoidal AC voltage, thus generating a voltage output across the load. By adjusting the timing of the trigger pulse on the control electrode, the average value of the output voltage across the load can be further adjusted, achieving controlled rectification. The conduction angle of the thyristor can be adjusted by controlling the trigger in the system to regulate the voltage, current, and power of the power supply. Replacing the original diodes with thyristors forms a thyristor rectifier bridge, enabling direct voltage regulation and rectification of a 690V three-phase voltage. Through phase-controlled voltage regulation of the thyristors, direct and efficient utilization of the 690V fan power supply is achieved, eliminating the need for a large-capacity intermediate step-down transformer and solving power compatibility and loss issues.

[0053] Figure 3 The diagram shows the DC voltage output when the phase voltage is 297V. The phase voltage is 279V (the line voltage is 515V), and the simulated DC output using this embodiment is 680V.

[0054] Figure 4 This is a diagram showing the DC voltage output when the phase voltage is 398V (line voltage 690V). The DC output simulated using this embodiment is 680V.

[0055] Figure 5This is a diagram showing the DC voltage output when the phase voltage is 490V. The phase voltage is 398V (line voltage 690V), and the simulated DC output in this embodiment is 680V.

[0056] It can be seen that the device can stably output the specified output voltage regardless of the input voltage. The device using this embodiment has a wide range of input voltages, so even if the voltage generated by the wind turbine fluctuates, it can still work normally and is not affected by the voltage of the offshore wind turbine, thus ensuring the stability of the output voltage and meeting the needs of the entire life cycle of the project.

[0057] In a specific embodiment, the DC filter unit uses a series filter capacitor and a smoothing reactor for filtering;

[0058] Using filter capacitors reduces the AC ripple coefficient, making the DC output of the power supply smooth and stable, reducing the impact of alternating ripple current on the circuit, and also absorbing current fluctuations generated during circuit operation and interference introduced through the AC source, making the electronic circuit's performance more stable.

[0059] Using smoothing reactors reduces AC ripple components and filters out some harmonics, reducing interference to communication along DC lines and avoiding instability caused by harmonics; by limiting the AC component superimposed on the DC current, the rectified current remains continuous, reducing current ripple and improving the input power factor.

[0060] The design of DC filter units using filter capacitors and smoothing reactors is a common technique in this field, and those skilled in the art know how to connect two electronic devices to achieve filtering functionality.

[0061] In a specific embodiment, such as Figure 6 As shown, the high-frequency inverter unit includes: first MOSFET M1 to fourth MOSFET M4 and high-frequency capacitor Cr;

[0062] The drain of the first MOSFET is connected to the drain of the second MOSFET, and the source is connected to the drain of the third MOSFET; the source of the second MOSFET is connected to the drain of the fourth MOSFET and one end of the high-frequency capacitor; the source of the third MOSFET is connected to the source of the fourth MOSFET.

[0063] Through the first to the fourth MOSFETs, DC power can be converted into the required AC power. The high-frequency interference signal generated by the MOSFETs is filtered by the high-frequency capacitor to remove noise and interference signals, thereby improving the quality and reliability of the beneficial signal.

[0064] In a specific embodiment, such as Figure 6 As shown, the high-frequency voltage regulation unit includes: a resonant inductor Lr, a first high-frequency transformer B1, and a second high-frequency transformer B2;

[0065] One end of the resonant inductor is connected to the other end of the high-frequency capacitor, and the other end of the resonant inductor is connected to the input side of the first high-frequency transformer and the second high-frequency transformer respectively; the output side of the first high-frequency transformer is connected to the drain of the fifth MOS transistor and the source of the sixth MOS transistor respectively; the output side of the second high-frequency transformer is connected to the drain of the seventh MOS transistor and the source of the eighth MOS transistor respectively.

[0066] Specifically, by setting a resonant inductor Lr and controlling its magnitude using the output current, the range of soft switching can be increased, the dependence of soft switching on load current can be reduced, thereby improving power efficiency and conducted electromagnetic interference immunity.

[0067] By using two high-frequency transformers to reduce the AC voltage to the required level, providing electrical isolation between the input and output, the equipment can be protected from voltage spikes and surges, energy can be transferred from the input to the output, and the magnitude of the output voltage can be controlled to meet the needs of different loads.

[0068] In a specific embodiment, such as Figure 6 As shown, the output rectifier unit includes a first synchronous rectifier circuit and a second synchronous rectifier circuit.

[0069] The first synchronous rectification circuit includes a fifth MOSFET, a sixth MOSFET, a fifth inductor, and a sixth inductor; the second synchronous rectification circuit includes a seventh MOSFET, an eighth MOSFET, a seventh inductor, and an eighth inductor.

[0070] The drains of the fifth and seventh MOSFETs are connected to one end of the fifth and seventh inductors, respectively. The sources of the fifth and seventh MOSFETs are connected to the drains of the sixth and eighth MOSFETs, respectively. The sources of the sixth and eighth MOSFETs are connected to one end of the sixth and eighth inductors, respectively. The other ends of the fifth to eighth inductors are all connected to one end of the filter capacitor in the output filter unit. The sources of the fifth and seventh MOSFETs and the drains of the sixth and eighth MOSFETs are connected to the other end of the filter capacitor in the output filter unit.

[0071] First embodiment: as follows Figure 7 As shown, the input DC voltage is 680V, ​​and the output results are 48V and 125V.

[0072] Second embodiment: as follows Figure 8 As shown, the input DC voltage is 680V, ​​and the output is 0.384V, 1A.

[0073] Typical external cathodic protection power supplies have a relatively narrow output voltage and current range, and the minimum values ​​of output voltage and current are relatively large. From the two embodiments, it can be seen that the power supply using this embodiment has a wide output voltage and current range, and the minimum values ​​of output voltage and current are very small, which can meet various extreme application scenarios.

[0074] In a specific embodiment, the output filtering unit also uses a filter capacitor Co;

[0075] In power supply circuits, output voltage often fluctuates due to changes in load and fluctuations in the power supply itself. Filter capacitors absorb these fluctuations, keeping the output voltage stable. When the voltage rises, the filter capacitor absorbs excess energy; when the voltage drops, the filter capacitor releases energy, thus ensuring stable circuit operation.

[0076] In a specific embodiment, the output switching unit uses a relay to control the output of voltage and current;

[0077] Relays are used to control whether to output current or voltage and to prevent external voltage backflow.

[0078] In a specific embodiment, such as Figure 1 As shown, the control system includes a main control unit, a detection module, a drive control module, and a fault diagnosis module.

[0079] The detection module includes an output detection unit for detecting the three-phase voltage and current at the output of the input filter unit, a DC voltage detection unit for detecting the output of the DC filter unit, a transformer detection unit for detecting the current and voltage on the primary and secondary sides of the transformer in the high-frequency voltage regulation unit, and an output detection unit at the output of the output of the output filter unit.

[0080] The drive control module includes a trigger connected to the input voltage regulation and rectification unit and a drive unit connected to the high-frequency inverter unit.

[0081] The fault judgment module is connected to the detection module and is used to receive the sampling data from the detection module and perform fault analysis.

[0082] The main control unit is connected to the detection module, the drive control module, and the fault judgment module, respectively, and is used to receive the output voltage and current set values ​​from the external host computer; based on the sampling data of the input detection unit, it determines whether the three-phase input conditions meet the preset requirements, and when the requirements are met, it controls the input voltage regulation rectifier unit and the high-frequency inverter unit to start working through the drive control module; it receives the analysis results of the fault judgment module, and when a fault is determined to occur, it controls the drive control module to stop working and executes the corresponding protection action.

[0083] The usage process of this utility model is as follows:

[0084] The three-phase output voltage of the wind turbine is connected to this power supply. The main control unit of the power supply detects whether the frequency and phase of the three-phase voltage meet the requirements. When the design requirements are met, the main control unit receives the set output current and voltage signals from the host computer. The main control unit sends a trigger signal to the trigger in the control unit. The synchronous transformer in the trigger collects the filtered voltage data, transforms the voltage, and outputs the transformed voltage to the controller that controls the thyristor. The controller sends a conduction angle control signal to the thyristor in the input voltage regulation and rectification unit to control the input voltage and realize voltage regulation and rectification.

[0085] When the input voltage and DC voltage are detected to meet the design requirements, the main control unit sends a control signal to the drive unit. The drive control module sends a control signal to drive the high-frequency inverter unit to invert the DC power into AC power. Then, the high-frequency voltage regulation unit adjusts the input AC voltage. The output rectifier unit converts the AC power into pulsating DC power. The output filter unit converts the pulsating DC power into smooth DC power. Thus, the set current and voltage are obtained.

[0086] At this time, the host computer sends a command to the power supply, and the main control unit sends a signal to the output switch unit, so that the current and voltage are applied to the anode rod.

[0087] This solution is used for the protection of offshore wind turbine monopiles and offshore converter station foundations, and its advantages are as follows:

[0088] (1) Protect the steel structure foundation:

[0089] Offshore wind turbine foundations are typically made of steel structures, which are exposed to the marine environment for extended periods and are susceptible to corrosion from seawater. Impressed current cathodic protection systems supply electrons to the steel foundation, lowering its potential and thus inhibiting corrosion. This protection method effectively extends the service life of the steel foundation, ensuring the safe and stable operation of the wind power facility.

[0090] (2) Adapting to complex marine environments:

[0091] 1. The salinity, temperature, and current velocity of seawater vary in different sea areas, resulting in different degrees of corrosion on steel structures. Impressed current cathodic protection systems can be adjusted according to different marine environmental conditions to ensure effective protection in various complex environments.

[0092] 2. Marine organisms can also corrode steel foundations. Cathodic protection systems can reduce biofouling and lower the risk of biocorrosion to some extent.

[0093] (3) Long-term stable protection:

[0094] 1. The impressed current cathodic protection system has high reliability and stability, and can provide long-term and continuous protection for offshore wind power foundations.

[0095] 2. This system is usually equipped with a monitoring and control system that can monitor the potential and protective current of the steel structure foundation in real time, so as to adjust the protection parameters in a timely manner and ensure that the protection effect is always at its best.

[0096] (4) Reduce maintenance costs:

[0097] 1. By adopting impressed current cathodic protection, corrosion damage to steel structure foundations can be reduced, the frequency of maintenance and repair can be decreased, thereby saving a significant amount of maintenance costs.

[0098] 2. Extend the service life of offshore wind power facilities and improve the return on investment.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A special impressed current cathodic protection power supply for offshore wind power with an ultra-wide input voltage range, connected to the three-phase AC power supply and anode rod of the wind turbine generator, characterized in that, include: The main circuit system and the control system electrically connected to the main circuit system for controlling the operation of the main circuit system; The main circuit system includes an AC-DC input voltage regulator module and a DC-DC voltage regulator module; the input terminal of the AC-DC input voltage regulator module is connected to the three-phase AC power supply of the wind turbine, the output terminal is connected to the input terminal of the DC-DC voltage regulator module, and the output terminal of the DC-DC voltage regulator module is connected to the anode rod. The AC-DC input voltage regulation module includes an input filter unit and an input voltage regulation and rectification unit connected in sequence. The input filtering unit is used to filter the ultra-wide three-phase AC power input to the wind turbine through an input filtering circuit equipped with multiple inductors and capacitors, and output the filtered three-phase AC power; the input voltage regulating and rectifying unit is used to regulate and rectify the filtered three-phase AC power through an input voltage regulating and rectifying circuit equipped with thyristors, and output DC power with a wide range of voltage regulation to meet the output requirements of the wind turbine. The DC-DC voltage regulation module includes a DC filter unit, a high-frequency inverter unit, a high-frequency voltage regulation unit, an output rectifier unit, an output filter unit, and an output switch unit connected in sequence. The DC filter unit is used to filter the DC power and output the filtered DC power; the high-frequency inverter unit is used to invert the filtered DC power into AC power; the high-frequency voltage regulation unit is used to regulate the AC power to a set value; the output rectifier unit is used to convert the input AC power into pulsating DC power through a synchronous rectifier circuit with multiple MOS transistors; the output filter unit is used to filter the pulsating DC power and output the final filtered DC power; the output switch unit is used to output the final filtered DC power to the anode rod.

2. The offshore wind power-specific impressed current cathodic protection power supply with ultra-wide input voltage as described in claim 1, characterized in that, The input filter circuit includes the first inductor to the third inductor and the first capacitor to the sixth capacitor; One end of the first inductor and one end of the first capacitor are connected to phase A of the three-phase AC power supply, and the other end of the first inductor is connected to one end of the fourth capacitor; one end of the second inductor and one end of the second capacitor are connected to phase B of the three-phase AC power supply, and the other end of the second inductor is connected to one end of the fifth capacitor; one end of the third inductor and one end of the third capacitor are connected to phase C of the three-phase AC power supply, and the other end of the third inductor is connected to one end of the sixth capacitor; the other ends of the first capacitor to the third capacitor are connected to the same terminal, and the fourth capacitor to the sixth capacitor are grounded.

3. The offshore wind power-specific impressed current cathodic protection power supply with ultra-wide input voltage as described in claim 2, characterized in that, The input voltage regulation rectifier circuit includes: a first thyristor to a sixth thyristor, a first resistor, a fourth inductor, and a seventh capacitor; The anode of the first thyristor is connected to the other end of the first inductor and the cathode of the second thyristor; the anode of the third thyristor is connected to the other end of the second inductor and the cathode of the fourth thyristor; the anode of the fifth thyristor is connected to the other end of the third inductor and the cathode of the sixth thyristor; the cathodes of the first, third, and fifth thyristors are all connected to one end of the fourth inductor; the anodes of the second, fourth, and sixth thyristors are all connected to one end of the seventh capacitor; the other end of the fourth inductor is connected to the other end of the seventh capacitor; and the two ends of the seventh capacitor are connected to the two ends of the first resistor.

4. The offshore wind power-specific impressed current cathodic protection power supply with ultra-wide input voltage as described in claim 1, characterized in that, The high-frequency inverter unit includes: first MOSFET to fourth MOSFET and high-frequency capacitor; The drain of the first MOSFET is connected to the drain of the second MOSFET, and the source is connected to the drain of the third MOSFET; the source of the second MOSFET is connected to the drain of the fourth MOSFET and one end of the high-frequency capacitor; the source of the third MOSFET is connected to the source of the fourth MOSFET.

5. A marine wind power-specific impressed current cathodic protection power supply with ultra-wide input voltage as described in claim 1, characterized in that, The output rectifier unit includes a first synchronous rectifier circuit and a second synchronous rectifier circuit; The first synchronous rectification circuit includes a fifth MOSFET, a sixth MOSFET, a fifth inductor, and a sixth inductor; the second synchronous rectification circuit includes a seventh MOSFET, an eighth MOSFET, a seventh inductor, and an eighth inductor. The drains of the fifth and seventh MOSFETs are connected to one end of the fifth and seventh inductors, respectively. The sources of the fifth and seventh MOSFETs are connected to the drains of the sixth and eighth MOSFETs, respectively. The sources of the sixth and eighth MOSFETs are connected to one end of the sixth and eighth inductors, respectively. The other ends of the fifth to eighth inductors are all connected to one end of the filter capacitor in the output filter unit. The sources of the fifth and seventh MOSFETs and the drains of the sixth and eighth MOSFETs are connected to the other end of the filter capacitor in the output filter unit.

6. A marine wind power-specific impressed current cathodic protection power supply with ultra-wide input voltage as described in claim 5, characterized in that, The high-frequency voltage regulation unit includes: a resonant inductor, a first high-frequency transformer, and a second high-frequency transformer; One end of the resonant inductor is connected to the other end of the high-frequency capacitor, and the other end of the resonant inductor is connected to the input side of the first high-frequency transformer and the second high-frequency transformer respectively; the output side of the first high-frequency transformer is connected to the drain of the fifth MOS transistor and the source of the sixth MOS transistor respectively; the output side of the second high-frequency transformer is connected to the drain of the seventh MOS transistor and the source of the eighth MOS transistor respectively.

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